WO2015012287A1

WO2015012287A1 - Reclining mechanism

Info

Publication number: WO2015012287A1
Application number: PCT/JP2014/069381
Authority: WO
Inventors: 広馬場; 達雄佐山
Original assignee: テイ・エステック株式会社
Priority date: 2013-07-24
Filing date: 2014-07-23
Publication date: 2015-01-29

Abstract

Provided is a reclining mechanism having a new configuration different from those of conventional ones. A reclining mechanism (1) is provided with: a base plate (10) which is secured to a seat cushion; an internal gear (50) which is secured to a seat back and is rotatable with respect to the base plate (10); a lock gear (20) which is rotatably supported by the base plate (10) so as to be rotatable between a lock posture of engagement with the internal gear (50) and a release posture of disengagement from the internal gear (50); a slide cam (30) which is linearly movably supported by the base plate (10) and brings the lock gear (20) into the lock posture or the release posture by pressing the lock gear (20); and a rotary cam (40) for operating the slide cam (30).

Description

Reclining mechanism

The present invention relates to a reclining mechanism for adjusting an inclination angle of a seat back with respect to a seat cushion.

In general, the reclining mechanism is disengaged from the base plate fixed to the seat cushion, the internal gear fixed to the seat back and rotatable with respect to the base plate, the lock position engaging with the internal gear, and the internal gear. A lock gear displaceable to the release position and a cam for pressing the lock gear toward the lock position are provided. There are various types of such reclining mechanisms, for example, there is a type in which a cam and a lock gear are supported by a base plate so as to be linearly movable (see Patent Document 1).

Also, as another reclining mechanism, there is a type in which a cam and a lock gear are rotatably supported on a base plate. (See Patent Document 2). Specifically, in this technique, a shaft portion having a convex cylindrical surface is provided on the base plate, and a concave cylindrical surface that is rotatably engaged with the outer peripheral surface of the shaft portion is formed on the lock gear. The lock gear is rotatable with respect to the base plate. That is, in this technique, the rotation axis of the lock gear is arranged at a position that is out of the lock gear as viewed from the direction of the rotation axis. Further, in this technique, a pivot protrusion is provided on the inner surface of the base plate, and a part of the side surface of the pivot protrusion is formed in an arc shape in a plan view, thereby providing a shaft support portion that rotatably supports the lock gear. ing. Further, in this technique, one guide protrusion is provided on the inner surface of the base plate corresponding to each lock gear, and each guide protrusion contacts the side surface of the corresponding lock gear to rotate the internal gear. An arcuate gear support surface is provided for receiving directional loads.

Further, as another reclining mechanism, there is a type in which a cam is rotatably supported by a base plate and a lock gear is supported by a base plate so as to be linearly movable (see Patent Document 3).

In addition, as another reclining mechanism, a lock gear that can move linearly between a lock position that meshes with the internal gear and a release position that deviates from the internal gear, and a base plate that is linearly movable and supported, the lock gear is locked. Some have a slide cam that presses toward (see Patent Document 4). Specifically, in this technique, a pressing portion for pressing the lock gear toward the lock position and a release portion for pressing the lock gear toward the release position are provided at the center in the moving direction of the slide cam. Yes. In this technique, the base plate is provided with a slide surface that slidably supports the slide cam and four guide portions that project from the slide surface and guide the slide cam. The respective guide portions are provided at positions separated from each other so as to guide the left and right side surfaces of the front end portion and the rear end portion in the moving direction of the slide cam.

Further, as another reclining mechanism, a slide cam that is slidably supported by the base plate and moves between a lock position that presses the lock gear to the lock position and a release position that presses the lock gear to the release position, and biases the slide cam. There is one provided with a spiral spring and a rotating cam that moves the slide cam by rotating (see Patent Document 5). Specifically, in this technique, a guide groove that guides the slide movement of the slide cam is formed by a guide block that is arranged so as to sandwich the slide cam in a direction orthogonal to the movement direction of the slide cam. In addition, the spiral spring has a predetermined number of turns, the inner end is wound in a square shape and is externally fitted to the end of the cylindrical portion of the rotating cam, the outer end protrudes outward, and the holding plate It is formed so that it can be hooked to a part. The rotating cam has a cylindrical portion and an engaging arm portion extending from the outer peripheral surface of the cylindrical portion, and is arranged in a state of being fitted in the fitting hole of the slide cam, and the engaging arm portion is fitted. It engages with an engaging groove provided so as to protrude from the outer periphery of the hole. Then, as the turning cam rotates, the engaging arm portion acts on the engaging groove portion, and the slide cam slides.

Japanese Patent No. 5195761 JP 2002-521165 A Japanese Patent No. 5189879 Japanese Patent No. 4622113 JP 2002-233426 A

Incidentally, the reclining mechanism of Patent Document 1 has a configuration in which an arcuate pivot surface, which is a part of the side surface of the pivot protrusion, and a part of the side surface of the lock gear slide, so that the pivot protrusion is disposed around the lock gear. As a result, there is a problem that the reclining mechanism is enlarged in the radial direction. Moreover, in the structure of patent document 2, since the one guide protrusion part which has a gear support surface was provided with respect to each lock gear, there exists a problem that a reclining mechanism will enlarge because a baseplate enlarges. . And in patent document 4, the structure which provides a press part and a cancellation | release part in the moving direction center part of a slide cam has the problem that a slide cam tends to enlarge. Further, in the configuration of Patent Document 5, in order to reduce the operation load for moving the slide cam, the engagement groove portion is disposed away from the rotation center of the rotation cam, and the engagement arm portion is formed long. There is a need to. However, if it does so, since both the slide cam and the rotating cam are enlarged, there arises a problem that the reclining mechanism itself is enlarged.

Further, if the rotation axis of the lock gear is arranged at a position away from the lock gear as in the technique of Patent Document 2, the rotation of the lock gear may become unstable.

On the other hand, in the reclining mechanism, in order to operate the reclining mechanism stably, it is desired to stabilize the movement of the slide cam after accurately determining the position of the slide cam. Further, it is desirable that the spring (biasing member) for biasing the slide cam is stably latched.

In view of these backgrounds, an object of the present invention is to provide a reclining mechanism having a new configuration that is completely different from the conventional one.

Also, an object of the present invention is to simplify the structure of the reclining mechanism and suppress an increase in size.

In addition, the present invention can determine the position of the slide cam accurately, and can be operated favorably by a reclining mechanism that can stabilize the movement of the slide cam and a stable rotation of the lock gear. An object is to provide a reclining mechanism.

Another object of the present invention is to provide a reclining mechanism that can stably latch the biasing member without complicating the configuration.

The present invention for solving the above-described problems is a reclining mechanism for adjusting an inclination angle of a seat back with respect to a seat cushion, the base plate being fixed to one of the seat cushion and the seat back, the seat cushion, and the It is fixed to the other side of the seat back and can be rotated between an internal gear that can rotate with respect to the base plate, a locking posture that meshes with the internal gear, and a releasing posture that is disengaged from the internal gear. The lock gear is rotatably supported by the base plate, and is supported by the base plate so as to be movable along a predetermined line. By pressing the lock gear, the lock gear is brought into the lock posture or the release posture. Slide cam and operating the slide cam Comprising the order of the operating member.

Here, the “predetermined line” means a straight line or a curve.

According to this, it is possible to provide a reclining mechanism having a new configuration different from the conventional one.

In the above-described configuration, the base plate has a slide surface facing the slide cam in the axial direction of the internal gear, and protrudes from the slide surface so as to sandwich the slide cam in a direction perpendicular to the moving direction of the slide cam. The internal gear includes a facing portion that faces the base plate in the axial direction, and a protruding portion that protrudes from the facing portion toward the base plate. Each guide portion may be provided with a rotation restricting portion that restricts the amount of rotation of the internal gear by restricting the movement of the protruding portion.

According to this, since the rotation restricting portion that restricts the movement of the protruding portion is provided in the guide portion, for example, the reclining mechanism can be simplified compared to a structure in which the rotation restricting portion is provided in a portion other than the guide portion. Can do.

In the above-described configuration, the slide cam can be configured to press the lock gear at the end in the moving direction.

According to this configuration, compared to the structure in which the lock gear is pressed at the central portion in the moving direction of the slide cam as in the prior art, the shape of the slide cam can be simplified, thereby suppressing the increase in the size of the slide cam. Can do.

Further, in the above-described configuration, the lock gear is formed in an elongated shape, one end portion facing the moving direction of the slide cam in the moving direction, the other end portion in the moving direction of the slide cam, and the A first position that presses the lock gear toward the lock posture by pressing the one end of the lock gear, and the other of the lock gear. You may be comprised so that it can move to the 2nd position which presses the said lock gear toward the said releasing attitude | position by pressing an edge part.

According to this, since the lock gear can be locked / released only by moving the slide cam, for example, a spring for releasing the lock gear is not necessary, and the reclining mechanism can be simplified. it can.

Further, in the above-described configuration, the lock gears are provided one by one with the slide cam interposed therebetween in the orthogonal direction orthogonal to the moving direction of the slide cam, and the one end of the slide cam is provided with each of the lock gears. A pair of abutting surfaces that abut one end are provided, and the pair of abutting surfaces may be inclined toward each other as they go from the other end to the one end.

According to this, each sloping contact surface of the slide cam can be fitted between one end of each lock gear, so that each lock gear can be firmly locked to the internal gear due to the wedge effect, and thus reclining. The mechanism can be operated well.

In the above-described configuration, the contact surface includes a first contact surface that contacts the lock gear until the slide cam reaches the first position from the second position, and the first contact surface. A second contact surface that is provided outside the surface in the orthogonal direction and contacts the lock gear when the slide cam is located at the first position, and the second contact surface is the slide You may curve so that it may dent toward the inner side of a cam.

According to this, when the lock gear is in the locked posture, the curved second contact surface comes into contact with the lock gear. For example, when the portion in contact with the second contact surface of the lock gear is a convex curved surface As a result, the contact area between the lock gear and the second contact surface is increased, and the locked state can be stabilized, and the reclining mechanism can be operated satisfactorily.

In the above-described configuration, each end of each lock gear is located on the one end portion side of the slide cam, on the other end portion side with respect to the contact surface, and when each lock gear is in the lock posture. A pair of opposed surfaces that are opposed to each other in the orthogonal direction may be provided on the portion, and in the locked posture, the opposed surfaces may be arranged in a non-contact state with the lock gear.

According to this, even if there is a product error or assembly error in components such as the lock gear and slide cam, the opposing surface and the lock gear do not interfere with each other when the lock gear is pressed by the contact surface of the slide cam. The internal gear can be easily meshed, and the reclining mechanism can be operated satisfactorily.

In the above-described configuration, the base plate is configured to sandwich the slide cam in a direction perpendicular to the moving direction of the slide cam, and a base portion that faces the slide cam in the rotation axis direction of the internal gear. And a plurality of guide portions for guiding the movement of the slide cam, and an engaged portion provided on the base portion, wherein the slide cam engages with the engaged portion. The engaged portion and the engaging portion can be configured to guide the movement of the slide cam.

According to such a configuration, the slide cam is sandwiched between the plurality of guide portions, and the engaging portion engages with the engaged portion formed on the base plate, so that the position of the slide cam can be accurately determined. it can. In addition, since the movement of the slide cam is guided by both the plurality of guide portions and the engaged portion, the movement of the slide cam can be stabilized.

In the reclining mechanism, at least a part of the engaged portion may be disposed outside a region sandwiched between the plurality of guide portions.

According to this, since the movement of the portion of the slide cam that is outside the region sandwiched between the guide portions can be guided by the engaged portion, the slide cam can also be disposed outside the region sandwiched between the pair of guide portions. The movement of can be stabilized.

In the configuration described above, the engaged portion is a concave portion extending in the moving direction, the engaging portion is a convex portion, and the base plate welds the base plate to one of the seat cushion and the seat back. A welding projection that protrudes from the base to the side opposite to the slide cam side, and the welding projection forms a weld recess that forms a concave shape on the surface of the slide cam side of the base. And the said to-be-engaged part can be set as the structure connected with the said welding recessed part.

According to this, the position of the slide cam can be accurately determined with a relatively simple configuration, and the movement of the slide cam can be stabilized. In addition, since the portion where the concave engaged portion and the welding concave portion are connected can be used for guiding the movement of the slide cam as a part of the engaged portion, the amount of movement of the slide cam can be secured. Moreover, the rigidity of a baseplate can be improved because the to-be-engaged part and the welding recessed part are connected.

In the configuration described above, the base plate has a base portion that faces the slide cam in the rotation axis direction of the internal gear, and a shaft support portion that is provided on the base portion and rotatably supports the lock gear, The lock gear has a pivoted support portion that engages with the pivot support portion, and the pivot support portion and the pivoted support portion can be disposed inside the ring of the lock gear as viewed from the rotation axis direction.

According to such a configuration, the shaft support portion and the shaft support portion are disposed inside the lock gear wheel when viewed from the rotational axis direction of the internal gear, thereby suppressing an increase in the radial size of the reclining mechanism. be able to.

In the reclining mechanism described above, the pivoted support portion is formed so that one side in the rotational axis direction is concave and the other side in the rotational axis direction is convex, and the lock gear is formed of the internal gear. It is a long shape extending along the circumferential direction, the pivoted support portion is disposed at one end portion in the circumferential direction, and the distal end portion on the one end side in the circumferential direction is more than the portion where the pivoted support portion is disposed. A pressed portion that is pressed by a cam may be provided, and the pressed portion may be formed to have a width larger than a width of a portion where the pivot support portion is disposed.

According to this, the pivoted support part that forms the concavo-convex shape in the lock gear and the pressed part having a width larger than the width of the part where the pivoted support part is disposed are arranged close to each other. Since the pressed parts reinforce each other, the rigidity of the lock gear can be improved.

In the reclining mechanism described above, the lock gear has a load transmitting portion that engages with the base plate and receives a load in the rotation direction of the internal gear on the inner side of the ring of the lock gear when viewed from the rotation axis direction. It can be configured.

According to this, it is possible to reduce the load applied to the shaft support portion and the shaft support portion with a compact configuration.

In the reclining mechanism described above, the lock gear has a long shape extending along the circumferential direction of the internal gear, the pivoted support portion is disposed at one end portion of the circumferential direction, and the load transmitting portion is configured by a first load. A transmission portion and a second load transmission portion, wherein the second load transmission portion is disposed on the opposite side of the pivoted support portion with the first load transmission portion interposed therebetween in the circumferential direction. Can do.

According to this, compared with the structure in which the first load transmission portion and the second load transmission portion are provided side by side in the width direction (short direction) of the long lock gear, the portion that receives the load of each load transmission portion Therefore, it is possible to further reduce the load applied to the shaft support portion and the shaft support portion.

In the configuration described above, the lock gear is provided with a rotation shaft portion that overlaps the rotation axis when viewed from the direction of the rotation axis of the lock gear, and the base plate rotates the outer peripheral surface of the rotation shaft portion. A bearing surface that is movably supported may be formed.

According to this configuration, the rotation of the lock gear can be stabilized as compared with the structure in which the rotation axis of the lock gear is arranged at a position away from the lock gear as in the prior art.

In the configuration described above, the base plate includes a base portion that faces the lock gears in the rotational axis direction of the internal gear, and a support convex portion that protrudes from the base portion toward the lock gear, and the lock gear includes a plurality of lock gears. A first lock gear and a second lock gear, wherein the support convex portion is in contact with a side surface of the first lock gear as viewed from the rotation axis direction and forms a ring, and the rotation direction of the internal gear A first gear support surface that receives the load of the internal gear, and a second gear support surface that receives a load in the rotational direction of the internal gear in contact with a side surface of the second lock gear as viewed from the rotational axis direction. It can be set as the structure which has.

According to such a configuration, since the first gear support surface that receives the load from the first lock gear and the second gear support surface that receives the load from the second lock gear are provided on one support convex portion, Compared with the prior art, the number of supporting convex portions can be reduced. Thereby, since the enlargement of a baseplate can be suppressed, the enlargement of a reclining mechanism can be suppressed.

In the reclining mechanism described above, the first gear support surface and the first contact surface that contacts the first gear support surface of the first lock gear rotate the first lock gear when viewed from the rotation axis direction. The second gear support surface and the second contact surface that comes into contact with the second gear support surface of the second lock gear are formed in an arc shape centering on the center, and the second contact surface when viewed from the rotation axis direction. The first gear support surface is disposed on one side of the support convex portion in the rotation direction of the internal gear, and the second gear support surface is formed. Can be configured to be disposed on the other side of the support convex portion in the rotation direction of the internal gear.

According to this, the contact surface that contacts the gear support surface and the gear support surface of the lock gear is formed in an arc shape, and the gear support surfaces are respectively disposed on both sides of the support convex portion in the rotation direction of the internal gear. Since the load is applied from both sides in the rotation direction, the lock gear can be stably supported.

In the configuration described above, a biasing member that biases the slide cam is provided, and the base plate has a base portion that faces the slide cam in the rotation axis direction of the internal gear, and protrudes from the base portion so as to protrude from the base cam. A plurality of guide portions that are arranged so as to sandwich the slide cam in a direction perpendicular to the moving direction, and that guide the movement of the slide cam, and one end of the biasing member is hooked on the guide portion. It can be set as a structure.

According to such a configuration, since the guide portion that guides the movement of the slide cam is used as the portion that latches one end of the biasing member, the configuration for latching the biasing member is complicated. There is nothing. In addition, since the one end of the urging member is hooked to the highly rigid guide portion protruding from the base portion of the base plate, the urging member can be stably hooked.

In the configuration described above, the internal gear includes a facing portion that faces the base portion in the rotation axis direction, and a gear-side rotation restricting convex portion that protrudes from the facing portion toward the base plate. The guide portion has a base side rotation restricting convex portion that restricts the amount of rotation of the internal gear by projecting toward the facing portion side and restricting movement of the gear side rotation restricting convex portion, and One end of the member can be configured to be hooked on the base side rotation restricting convex portion in the guide portion.

According to this, since the protruding guide part is further provided with a convex part (base side rotation restricting convex part), the rigidity of the guide part can be further increased, and the rigidity of the guide part with higher rigidity can be increased. Since one end of the urging member is hooked to the portion, the urging member can be hooked more stably.

In the configuration described above, an operation member that is rotatably supported with respect to the base plate and moves to move the slide cam to the lock position or the release position by rotation is provided, and the slide cam includes the operation member An extension portion extending from the rotation center of the operation member toward one of the movement directions of the slide cam as viewed from the rotation axis direction of the operation member, and protruding to the opposite side of the base plate to engage with the operation member And a drive projection that transmits the operation of the operation member to the slide cam, and the drive projection passes through the rotation center of the operation member when viewed from the rotation axis direction. It can be set as the structure arrange | positioned at the said extension part side with respect to the straight line extended in the orthogonal direction orthogonal to.

According to such a configuration, the drive convex portion can be disposed away from the rotation center because the drive convex portion is disposed on the extending portion side extending from the rotation center of the operation member. Therefore, the operation load for moving the slide cam can be reduced. In addition, by arranging the driving convex portion on the extending portion side that extends from the rotation center of the operation member, the slide is compared with the configuration in which the driving convex portion is formed separately from the extending portion. Since the enlargement of the whole cam can be suppressed, the enlargement of the reclining mechanism can be suppressed.

1 is a side view showing a vehicle seat provided with a reclining mechanism according to a first embodiment of the present invention. It is a disassembled perspective view which decomposes | disassembles and shows a reclining mechanism. It is sectional drawing (a) which shows the reclining mechanism of a locked state, and the enlarged view (b) of X part of Fig.3 (a). It is sectional drawing which shows the reclining mechanism of a cancellation | release state. It is the perspective view which looked at the internal gear from the inside. It is sectional drawing which shows the state by which the lock gear is hold | maintained in the cancellation | release state by the cancellation | release state holding part of the internal gear. It is sectional drawing which shows the state by which the lock gear is not hold | maintained in the cancellation | release state by the cancellation | release state holding part of the internal gear. It is the perspective view which looked at the base plate from the outside. FIG. 10A is a cross-sectional view showing a locked state of the reclining mechanism according to the second embodiment, and FIG. 9B is a cross-sectional view taken along the line II in FIG. It is sectional drawing which shows the cancellation | release state of the reclining mechanism which concerns on 2nd Embodiment. It is sectional drawing which shows the locked state of the reclining mechanism which concerns on the modification 1 of 2nd Embodiment. It is sectional drawing which shows the cancellation | release state of the reclining mechanism which concerns on the modification 1 of 2nd Embodiment. It is sectional drawing which shows the locked state of the reclining mechanism which concerns on the modification 2 of 2nd Embodiment. It is sectional drawing which shows the cancellation | release state of the reclining mechanism which concerns on the modification 2 of 2nd Embodiment. It is sectional drawing which shows the reclining mechanism which concerns on the modification 3 of 2nd Embodiment. It is sectional drawing which shows the cancellation | release state of the reclining mechanism which concerns on 3rd Embodiment. Sectional drawing (a) which shows mesh | engagement timing with the internal gear of each lock gear of the reclining mechanism which concerns on 3rd Embodiment, The enlarged view (b) of A part of Fig.17 (a), Fig.17 (a) It is an enlarged view (c) of B part. It is sectional drawing which shows the cancellation | release state of the reclining mechanism which concerns on 4th Embodiment. It is sectional drawing which shows the locked state of the reclining mechanism which concerns on 4th Embodiment. It is sectional drawing which shows the cancellation | release state of the reclining mechanism which concerns on 5th Embodiment. It is sectional drawing which shows the locked state of the reclining mechanism which concerns on 5th Embodiment. It is a disassembled perspective view of the reclining mechanism which concerns on 6th Embodiment. It is sectional drawing which looked at the base plate which concerns on 6th Embodiment, the internal gear, the lock gear, and the slide cam from the facing part side of the internal gear. It is a perspective view of the base plate and slide cam which concern on 6th Embodiment. It is a figure (a) and (b) which show the function of the base side rotation control convex part and gear side rotation control convex part concerning a 6th embodiment. It is the perspective view which looked at the baseplate which concerns on 6th Embodiment from the outer side. It is the perspective view which looked at the internal gear which concerns on 6th Embodiment from the inner side. It is sectional drawing which looked at the reclining mechanism which concerns on 6th Embodiment from the base part side of the baseplate. It is sectional drawing which cut | disconnected the reclining mechanism which concerns on 6th Embodiment by the surface orthogonal to an up-down direction. It is sectional drawing of the locked state of the reclining mechanism which concerns on 6th Embodiment. It is sectional drawing of the cancellation | release state of the reclining mechanism which concerns on 6th Embodiment. It is an expanded sectional view which cut near the pair of guide parts of the reclining mechanism concerning the 1st modification of a 6th embodiment by the field which intersects perpendicularly in the up-and-down direction. It is sectional drawing which looked at the reclining mechanism which concerns on the 2nd modification of 6th Embodiment from the base part side of the baseplate.

[First Embodiment]
Hereinafter, a first embodiment of the present invention will be described with reference to the drawings. In the present invention, front and rear, left and right, and top and bottom are based on a passenger sitting on the vehicle seat S.

As shown in FIG. 1, the reclining mechanism 1 is a mechanism for adjusting the inclination angle of the seat back S2 with respect to the seat cushion S1 of the vehicle seat S, and is provided on one side of the rear portion of the seat cushion S1 in the left-right direction. Yes. In the following description, it is assumed that the reclining mechanism 1 is provided on the right side of the seat cushion S1.

The seat cushion S1 has a pair of cushion side frames F1 that are spaced apart from each other on the left and right, and the seat back S2 has a pair of back side frames F2 that are spaced apart from each other on the left and right. The lower end portion of each back side frame F2 overlaps with the rear end portion of the corresponding cushion side frame F1 when viewed from the left-right direction, and is disposed on the inner side in the left-right direction than the rear end portion. The reclining mechanism 1 is provided between the rear end portion of the right cushion side frame F1 and the lower end portion of the right back side frame F2.

As shown in FIG. 2, the reclining mechanism 1 includes a base plate 10, two lock gears 20, a slide cam 30 as an example of a cam, a rotating cam 40 as an example of an operation member, an internal gear 50, A ring 60 and a spiral spring SP as an example of a first urging member are provided.

The base plate 10 is fixed to a cushion side frame F1 (see FIG. 1) constituting the seat cushion S1. The internal gear 50 is rotatably supported by the base plate 10 via the ring 60, is fixed to the back side frame F2 (see FIG. 1) constituting the seat back S2, and rotates integrally with the seat back S2. It is supposed to be.

The rotation of the internal gear 50 with respect to the base plate 10 is regulated (locked) or allowed (released) by the lock gear 20 operated by the slide cam 30 or the like disposed between the base plate 10 and the internal gear 50. It has become. As a result, the tilting of the seat back S2 relative to the seat cushion S1 can be restricted or allowed depending on the operating state of the lock gear 20 or the like. Below, each member is demonstrated in detail.

The base plate 10 has a disk-shaped base portion 11, a pair of guide portions 12 and a pair of upper bulge portions 13 that bulge from the base portion 11 to the left side (internal gear 50 side).

A portion of the left surface of the base 11 sandwiched between the pair of guide portions 12 faces the slide cam 30 in the axial direction of the internal gear 50, and supports the slide cam 30 so as to be slidable in the vertical direction. It becomes the slide surface 11a. The slide surface 11 a is formed so as to extend upward and downward from the central portion of the base portion 11. In addition, a through hole 11 b for inserting the rotation shaft portion 41 of the rotation cam 40 is formed at the center of the base portion 11.

The pair of guide portions 12 are portions that guide the slide cam 30 so as to be movable in the vertical direction, and are arranged so as to sandwich the slide surface 11a in the front-rear direction orthogonal to the movement direction of the slide cam 30. One rotation restricting portion 15 that bulges toward the left side is formed on the left surface of each guide portion 12. Each rotation restricting portion 15 is disposed at an equal distance from the rotation axis of the internal gear 50, and restricts the movement of the protruding portion 54 formed on the internal gear 50 in the circumferential direction, whereby The amount of rotation of the gear 50 is regulated (see FIGS. 6 and 7). Thereby, it is possible to regulate the amount of tilting of the seat back S2 that rotates integrally with the internal gear 50. Further, since the rotation restricting portion 15 is provided in the guide portion 12, for example, the reclining mechanism 1 can be simplified compared to a structure in which the rotation restricting portion is provided in a portion other than the guide portion.

The upper bulging portions 13 are arranged on the upper side of the guide portions 12 with a space therebetween. And the outer peripheral surface 22 of the rotating shaft part 21 integrally formed in each lock gear 20 is each rotated in the lower part of the front-back direction outer side of each upper bulging part 13, and the upper part of the front-back direction outer side of each guide part 12. The bearing surface 14 which supports it is formed integrally. As described above, the outer peripheral surface 22 of the rotation shaft portion 21 formed integrally with the lock gear 20 is supported by the bearing surface 14 formed integrally with the base plate 10, for example, a shaft that is a separate member from the lock gear and the base plate. Compared to the configuration in which the lock gear can be rotated with respect to the base plate via the member, the reclining mechanism 1 can be easily configured.

Specifically, as shown in FIG. 3A, the outer peripheral surface 22 of the rotation shaft portion 21 is rotated with the arc-shaped first outer peripheral surface 22 a centering on the rotation axis 21 A of the rotation shaft portion 21. It has an arcuate second outer peripheral surface 22b that is provided on the opposite side to the first outer peripheral surface 22a with respect to the axis 21A and that is centered on the rotation axis 21A. The first outer peripheral surface 22a is disposed on the upper side of the rotation axis 21A, and is formed so that the distance to the rotation axis 21A is larger than the distance from the second outer peripheral surface 22b to the rotation axis 21A. Yes. That is, the curvature radius of the first outer peripheral surface 22a is larger than the curvature radius of the second outer peripheral surface 22b.

In each sectional view of FIG. 3A and the like, the rotating cam 40 is shown without being broken for convenience. 3A and 4, for the sake of convenience, the illustration of a protruding portion 54 and a released state holding portion 55 of an internal gear 50 which will be described later is omitted.

On the other hand, the bearing surface 14 is formed in a shape that follows the first outer peripheral surface 22a, and has a shape that follows the first inner peripheral surface 14a that rotatably supports the first outer peripheral surface 22a and the second outer peripheral surface 22b. And a second inner peripheral surface 14b that rotatably supports the second outer peripheral surface 22b.

On the outer side in the front-rear direction of the first outer peripheral surface 22a of the lock gear 20, a first concave portion 23a having a circular arc shape in a sectional view that is recessed toward the inner side of the lock gear 20 is formed adjacently. Is formed to be continuous with the first outer peripheral surface 22a. Similarly, a second concave portion 23b that is recessed toward the inner side of the lock gear 20 is formed adjacent to the second outer peripheral surface 22b of the lock gear 20 in the front-rear direction, and the inner peripheral surface of the second concave portion 23b. Is formed to be continuous with the second outer peripheral surface 22b.

Thus, the area of each outer

peripheral surface

22a, 22b can be increased, and the area of the bearing surface 14 can be increased in accordance with each outer

peripheral surface

22a, 22b having a larger area. 22 can be favorably supported.

A first regulated surface 22c is formed at the inner edge in the front-rear direction of the first outer peripheral surface 22a so as to extend in a direction intersecting the first outer peripheral surface 22a from the end edge, specifically, downward. Further, a second regulated surface 22d extending in a direction intersecting the second outer peripheral surface 22b from the end edge, specifically, upward is formed at the inner edge in the front-rear direction of the second outer peripheral surface 22b.

On the other hand, a first regulating surface 14c extending in the direction intersecting the first inner circumferential surface 14a from the end edge, specifically, the lower side, is formed at the inner edge in the front-rear direction of the first inner circumferential surface 14a. Further, a second regulating surface 14d extending in the direction intersecting with the second inner peripheral surface 14b from the end edge, specifically, upward is formed on the inner edge in the front-rear direction of the second inner peripheral surface 14b.

The first restricting surface 14c is a surface for restricting the first restricted surface 22c from moving inward in the front-rear direction (in the direction away from the internal gear 50), and inward in the front-rear direction of the first restricted surface 22c. It arrange | positions and is facing the said 1st to-be-regulated surface 22c, adjoining in the front-back direction. The second restricting surface 14d is a surface that restricts the movement of the second restricted surface 22d inward in the front-rear direction (the direction away from the internal gear 50), and inward in the front-rear direction of the second restricted surface 22d. It is arranged and faces the second regulated surface 22d in close proximity in the front-rear direction.

The distance between the first restricted surface 22c and the first restricted surface 14c is greater than the distance between the second restricted surface 22d and the second restricted surface 14d when the lock gear 20 is in the locked posture shown in FIG. Is set to be smaller. More specifically, when the lock gear 20 is in the locked posture, the first regulated surface 22c comes into contact with the first regulating surface 14c, and the second regulated surface 22d is separated from the second regulating surface 14d.

By configuring each surface in this manner, for example, when a large force is applied to the vehicle seat S during a collision, the movement of the first regulated surface 22c is regulated by the first regulating surface 14c. The engagement state between the lock gear 20 and the internal gear 50 can be maintained.

More specifically, as described above, the first regulated surface 22c whose movement is regulated by the first regulating surface 14c is such that the distance from the first outer circumferential surface 22a to the rotational axis 21A is the rotational axis from the second outer circumferential surface 22b. By being configured to be larger than the distance to 21A, it is formed with a larger area than the second regulated surface 22d. Moreover, each

control surface

14c, 14d which controls the movement of each

control surface

22c, 22d is formed in the magnitude | size matched with the

corresponding control surface

22c, 22d, and the 1st control surface 14c is 2nd. The area is larger than the regulation surface 14d.

Thus, the first restricted surface 22c and the first restricted surface 14c that are close to each other in the locked posture are made larger than the second restricted surface 22d and the second restricted surface 14d. When a large force is applied to the sheet S, the movement of the large first regulated surface 22c can be regulated by the large first regulating surface 14c, so that the engagement state of the lock gear 20 and the internal gear 50 is maintained. It is possible.

Further, since the second restricted surface 22d and the second restricted surface 14d are provided, for example, even when the first restricted surface 22c or the first restricted surface 14c is deformed and the lock gear 20 moves during a collision. The engagement state of the lock gear 20 and the internal gear 50 can be maintained by the contact between the second regulated surface 22d and the second regulating surface 14d.

Further, the rotation shaft portion 21 overlaps the rotation axis 21 A when viewed from the direction of the rotation axis 21 A of the lock gear 20. Thereby, the rotation of the lock gear 20 can be stabilized as compared with the structure in which the rotation axis of the lock gear is arranged at a position deviated from the lock gear as in the prior art, so that the reclining mechanism 1 can be operated well. It is possible.

The lock gear 20 is provided one by one across the slide cam 30 in the front-rear direction as an example of the orthogonal direction orthogonal to the moving direction of the slide cam 30, and the lock gear 20 meshes with the internal gear 50, The base plate 10 is rotatably supported so as to be rotatable between the released release posture (posture in FIG. 4). The lock gear 20 is formed in a long shape extending along the circumferential direction of the internal gear 50, and the upper end portion and the lower end portion are disposed on the movement locus of the slide cam 30. It faces each end in the moving direction. The lock gear 20 includes the rotation shaft portion 21 described above, a first arc-shaped first extension portion 24 extending downward from the rotation shaft portion 21 along the inner peripheral surface of the internal gear 50, and the rotation shaft portion 21. And a second extending portion 25 as an example of an extending portion extending inward in the front-rear direction (in a direction away from the internal gear 50).

A plurality of gear teeth 24 a that mesh with a plurality of internal teeth 51 formed on the internal gear 50 are provided on the outer peripheral surface of the first extension portion 24. When the lock gear 20 is in the locked posture, the front end portion of the first extension portion 24 is slanted from the upper end of the first surface 24b to the outer side in the front-rear direction and the upper side. And a second surface 24d extending upward from an end on the outer side in the front-rear direction of the inclined surface 24c. The corners and corners between the surfaces 24b to 24d are formed in a gentle R shape (curved surface shape).

The inclined surface 24 c is pressed downward by the slide cam 30, so that the lock gear 20 is locked to the internal gear 50. More specifically, when the lock gear 20 is in the locked posture, a contact portion between the slide cam 30 and the inclined surface 24c, a contact portion between the one or more gear teeth 24a and the inner teeth 51 that contact the gear teeth 24a, The lock gear 20 is supported at three locations by the contact portion between the first regulated surface 22c and the first regulating surface 14c.

Further, an arc-shaped protrusion 26 that protrudes to the left from the surface is formed on the left surface of the first extension portion 24 so as to follow the inner peripheral surface of the internal gear 50 (see also FIG. 2).

The second extending portions 25 formed in the respective lock gears 20 are formed so as to extend from the respective rotating shaft portions 21 so as to approach each other, and when the respective lock gears 20 are in the locked posture, the respective second extending portions 25 are Is configured to be smaller than the meshing amount between the lock gear 20 and the internal gear 50. Thereby, due to the strong force at the time of collision, the first restricting surface 14c is deformed and the movement of the first restricted surface 22c cannot be restricted, or the first restricted surface 22c or the first restricting surface 14c is deformed, Even when the lock gear 20 in the locked posture moves, the engagement state between the lock gear 20 and the internal gear 50 can be maintained by contact between the second extending portions 25.

Further, the width of the second extending portion 25 in the vertical direction is smaller than the maximum width of the rotating shaft portion 21 in the vertical direction. Specifically, the cross-sectional area perpendicular to the front-rear direction of the second extending part 25 (cross-sectional area perpendicular to the extending direction) is smaller than the maximum value of the cross-sectional area perpendicular to the front-rear direction of the rotating shaft part 21. Yes. Thereby, for example, the reclining mechanism 1 can be reduced in size compared to a configuration in which the cross-sectional area of the second extending portion is configured to be greater than or equal to the maximum cross-sectional area of the rotating shaft portion.

The slide cam 30 is a substantially rectangular plate-like member that is long in the vertical direction, and is supported between the pair of guide portions 12 so as to be linearly movable in the vertical direction. The slide cam 30 has a first position (hereinafter also referred to as a lock position) that presses the lock gear 20 toward the lock posture by pressing the tip of the first extension portion 24 of the lock gear 20 at the lower end, and the upper end. By pressing the distal end portion of the second extending portion 25 of the lock gear 20 with the portion, the lock gear 20 can be moved to a second position (the position in FIG. 4, hereinafter also referred to as a release position) that presses the lock gear 20 toward the release posture. It is configured.

According to this, since the lock gear 20 can be locked / released only by pressing the lock gear 20 with the slide cam 30, for example, a spring for releasing the lock gear becomes unnecessary, and the number of parts increases. Can be suppressed. Moreover, since it comprised so that the both ends of the longitudinal direction of the lock gear 20 might be pressed with the slide cam 30, compared with the structure which presses the center part of the longitudinal direction of a lock gear with a slide cam, the lock gear 20 becomes easy to rotate, The lock gear 20 can be locked or released satisfactorily.

Furthermore, since the lock gear 20 is pressed at each end in the moving direction of the slide cam 30, for example, compared to a structure in which the lock gear is pressed at the center in the moving direction of the slide cam as in the prior art, the moving direction of the slide cam 30 is increased. A force can be efficiently transmitted from each end to the lock gear 20, and an increase in the size of the slide cam 30 can be suppressed. Further, since the moving direction of the slide cam 30 is set in the vertical direction, when a force is applied in the front-rear direction to the seat back S2 at the time of a collision, the force is transferred via the internal gear 50 and the lock gear 20 to the slide cam 30. 30 is added in a direction orthogonal to the moving direction. Therefore, it is possible to suppress the slide cam 30 from moving in the release direction, and thus the lock gear 20 can be maintained in the locked posture.

The lower end of the slide cam 30 has a pair of first contacts that abut (slidably contact) the inclined surfaces 24c of the lock gears 20 while the slide cam 30 moves from the release position to a position slightly before the lock position. A contact surface 31 and a pair of second contact surfaces 32 that contact each inclined surface 24c of each lock gear 20 when the slide cam 30 is positioned at the lock position are provided. A pair of guided surfaces 33 guided by the respective guide portions 12 are formed on both front and rear sides of the slide cam 30 so as to extend in the vertical direction.

The first contact surfaces 31 are formed so as to be inclined toward each other toward the lower side, and are connected at the center of the slide cam 30 in the front-rear direction. A first connection surface 34 that connects the first contact surface 31 and the second contact surface 32 is formed on the outer edge in the front-rear direction of each first contact surface 31 so as to extend upward. Yes. The first connecting surface 34 is in a non-contact state with the lock gear 20 when the lock gear 20 is in the locked posture (see FIG. 3B).

Each second contact surface 32 is formed so as to be inclined upward and outward in the front-rear direction from the upper end of each first connection surface 34. Thus, each 2nd contact surface 32 inclines and is formed, and each 2nd contact surface 32 is made into the lower edge part (R between 1st surface 24b and inclined surface 24c) of each lock gear 20. Since each of the lock gears 20 can be firmly locked to the internal gear 50 by the wedge effect.

Further, each of the second contact surfaces 32 has a slide cam so as to coincide with an R-shaped corner between the first surface 24b and the inclined surface 24c of each lock gear 20 when each lock gear 20 is in the locked posture. The curved shape is recessed toward the inside of 30. Thereby, when each lock gear 20 is in the locked posture, the contact area between each curved second contact surface 32 and the R-shaped corner of each lock gear 20 is increased, so that the locked state can be stabilized. It has become.

A second connecting surface 35 that connects the second abutting surface 32 and the guided surface 33 extends upward at the outer edge in the front-rear direction of each second abutting surface 32, and then gradually outwards in the front-rear direction. It is formed to be curved.

The lower end portion of each guided surface 33 is a facing surface 33a that faces the second surface 24d of each lock gear 20 in the front-rear direction when each lock gear 20 is in the locked posture. The facing surface 33a is disposed in a non-contact state with the lock gear 20 when the lock gear 20 is in the locked posture, and the distance between the facing surface 33a and the second surface 24d is the lock gear 20 when the lock gear 20 is in the locked posture. And the internal gear 50 are set to be smaller than the meshing amount (see FIG. 3B).

Thus, even when the lock gear 20 in the locked posture moves during a collision, the engagement state between the lock gear 20 and the internal gear 50 can be maintained by the contact between the facing surface 33a and the second surface 24d. It is possible. Further, since the facing surface 33a and the lock gear 20 are not in contact with each other, even when there are product errors or assembly errors in the components such as the lock gear 20 and the slide cam 30, the slide cam 30 is moved in the locking direction. Since the opposed surface 33a and the lock gear 20 do not interfere with each other, only the second contact surfaces 32 of the slide cam 30 can be brought into contact with the lock gears 20 at the time of locking, and the lock gears 20 can be easily engaged with the internal gear 50. be able to.

Further, the length L1 between the end edges on the outer side in the front-rear direction of each second contact surface 32 is smaller than the interval L2 between the opposing surfaces 33a. As a result, each of the second contact surfaces 32 and each of the first contact surfaces 31 arranged on the inner side in the front-rear direction than the second contact surfaces 32 can easily enter between the lock gears 20. It can be smoothly rotated to the locked posture.

Further, when each lock gear 20 is in the release posture, a gap is formed between the lower end portion of the slide cam 30 and the tip end portion of the first extension portion 24 of each lock gear 20. Thereby, it is possible to smoothly start the slide cam 30 from the release position to the lock position.

The upper end portion 36 of the slide cam 30 is formed in a tapered shape that gradually decreases in width toward the upper side, and the corner portion at the upper end is formed in a gentle R shape. When the slide cam 30 is moved from the lock position to the release position, the upper end portion 36 abuts on the distal end portion of the second extending portion 25 of each lock gear 20 and presses the distal end portion upward. The lock gear 20 rotates from the locked posture to the released posture.

As shown in FIG. 2, the left side surface of the slide cam 30 is provided with a convex portion 37 that protrudes to the left side from the surface and engages with the groove 44 of the rotating cam 40. In addition, an elongated hole 38 that is long in the vertical direction is formed in a substantially central portion of the slide cam 30 so as to penetrate the rotation shaft portion 41 of the rotation cam 40 in the left-right direction and to allow the slide cam 30 to move. ing.

Rotating cam 40 is a member for moving slide cam 30 upward, and is configured to rotate in conjunction with an operating lever (not shown) operated by a passenger. The rotation cam 40 is rotatably supported by the through hole 11b of the base plate 10 and the left end portion of the rotation shaft portion 41 is directed radially outward of the rotation shaft portion 41. And a cam plate portion 42 that extends.

The rotation shaft portion 41 is formed in a substantially cylindrical shape that protrudes to the right side of the base plate 10 through the long hole 38 of the slide cam 30 and the through hole 11b of the base plate 10. A part of the outer peripheral surface of the rotating shaft portion 41 is formed as a spring hook portion 41a formed in a flat shape.

The inner end of the spiral spring SP is engaged with the spring hook 41a, and the rotating cam 40 is always attached in the locking direction (counterclockwise direction in FIG. 3A) by the spiral spring SP. It is energized. The rotating cam 40 is formed with a hexagonal hole 43 that penetrates the rotating shaft portion 41 and the cam plate portion 42, and the hexagonal hole 43 is interlocked with an operation lever (not shown) or the operation lever. The mechanism is engaged.

The cam plate portion 42 has a slot 44 as an example of a substantially V-shaped groove portion into which the convex portion 37 of the slide cam 30 enters and engages at a position away from the rotation center of the rotation cam 40. Is formed. As shown in FIG. 3A, the slot 44 includes a first slot 44a extending substantially along the radial direction of the internal gear 50, and a counterclockwise rotation from the radially outer end of the first slot 44a. And a second slot 44b extending in the direction.

The first slot 44a pushes the convex portion 37 downward when the rotating cam 40 is rotated in the locking direction (counterclockwise direction), and moves the slide cam 30 to the locking position. When 40 is rotated in the release direction (clockwise direction), the convex portion 37 is pressed upward to move the slide cam 30 to the release position.

The second slot 44b rotates the rotating cam 40 further in the release direction after the slide cam 30 is located at the release position, that is, after the convex portion 37 is located at the radially outer end of the first slot 44a. It is formed in such a shape that the convex portion 37 is not moved up and down when being moved. Specifically, the second slot 44b is formed in a shape including a relative movement locus (arc-like locus) of the convex portion 37 positioned at the radially outer end of the first slot 44a with respect to the rotating cam 40. Has been. And the edge part on the opposite side to the 1st slot 44a of the 2nd slot 44b is set to the position where a space | gap is left between the convex parts 37, when a passenger | crew pulls an operation lever. (See FIG. 4).

By forming the second slot 44b as described above, the first cam slot 44a presses the convex portion 37 upward, and the slide cam 30 is positioned at the release position. Even if it is rotated, the convex portion 37 can be prevented from further moving by the second slot 44b, so that it is possible to prevent an excessive load from being applied to the reclining mechanism 1. Yes.

As shown in FIGS. 2 and 5, the internal gear 50 protrudes toward the base plate 10 from the disc portion 52 as an example of a facing portion that faces the base plate 10 in the axial direction and the outer peripheral portion of the disc portion 52. And a ring-shaped inner tooth forming portion 53 having inner teeth 51 on the inner peripheral side.

The disc part 52 is a part that forms a housing for housing the lock gear 20, the slide cam 30, and the rotating cam 40 with the base plate 10, and includes a first holding part 52a and the first holding part 52a. And a second holding portion 52b disposed on the radially inner side.

The first holding portion 52a is formed in a ring shape centering on the axis of the internal gear 50, and holds each lock gear 20 sandwiched between the base plate 10 and the first holding portion 52a. In the first holding portion 52a, four arc-shaped concave portions 56 that are recessed toward the left side are formed in an arc shape centering on the axis of the internal gear 50, and are arranged at equal intervals in the circumferential direction. ing. Thereby, since the rigidity of the internal gear 50 can be increased, the lock gear 20 and the like can be favorably held between the internal gear 50 and the base plate 10.

The second holding portion 52b is formed in a bottomed cylindrical shape that is recessed toward the opposite side of the base plate 10 relative to the first holding portion 52a, and the slide cam 30 and the rotating cam 40 are sandwiched between the second holding portion 52b and the base plate 10. Is holding in.

A projecting portion 54 that abuts against each rotation restricting portion 15 of the base plate 10 in the circumferential direction is formed on the bottom surface of the second holding portion 52b so as to project toward the base plate 10 side. The first holding portion 52a is formed with a release state holding portion 55 that protrudes from the first holding portion 52a toward the base plate 10 side.

The released state holding portion 55 is a part for holding each lock gear 20 in the released state until the seat back S2 is in the slightly raised state from the state where the seat back S2 is most forwardly tilted, and the axial direction of the internal gear 50 It is formed in a substantially trapezoidal shape when viewed from above. The release state holding portion 55 is formed in a wedge shape that tapers as the tip end portion 55a on the downstream side in the rotational direction of the internal gear 50 moves toward the downstream side when the seat back S2 is tilted forward. Specifically, the radially inner surface of the distal end portion 55a (the shaft-side surface of the internal gear 50) is formed so as to incline radially outward toward the downstream side in the rotational direction.

A support surface 55 b for supporting the arc-shaped protrusion 26 of the lock gear 20 from the radially outer side is formed on the radially inner side of the release state holding portion 55 so as to be along the outer peripheral surface of the arc-shaped protrusion 26. As shown in FIG. 7, when each lock gear 20 is in the release posture, the tip of the release state holding portion 55 (tip of the tip portion 55 a) is arranged at a position radially outside the arc-shaped protrusion 26 of the lock gear 20. The support surface 55b is disposed on the radially inner side of the outer peripheral surface of the arc-shaped protrusion 26.

As a result, when the release state holding portion 55 is moved counterclockwise from the position shown in FIG. 7 when each lock gear 20 is in the release posture, the front arc-shaped projection 26 is moved inward by the wedge-shaped tip portion 55a. The front lock gear 20 is slightly rotated counterclockwise from the released posture. The front-side lock gear 20 that rotates in this manner slightly pushes up the slide cam 30 upward, and the slide cam 30 that moves upward slightly pushes up the upper end of the rear-side lock gear 20, and the rear-side lock gear 20. Is slightly rotated clockwise. For this reason, while the lock gear 20 on the front side is held by the release state holding portion 55, each lock gear 20 is in a position farther from the internal gear 50 than the release position (position in FIG. 7). It is possible to hold the release state better.

In this way, the occupant can operate the operation lever by supporting the outer peripheral surface of the arcuate protrusion 26 on the front side by the release state holding portion 55 until the seat back S2 is in the state where the seatback S2 is tilted forward most. Even without operating the seat back S2, it is possible to freely tilt the seat back S2 in a range between a state where the seat back S2 is tilted forward and a state where it is slightly raised. Further, since the distal end portion 55a of the release state holding portion 55 is formed in a wedge shape, the release state holding portion 55 is moved counterclockwise in the figure from a position deviated from the arcuate protrusion 26 (for example, the position in FIG. 7). Thus, even when the lock gear 20 is inclined slightly toward the lock posture from the release posture, the lock gear 20 is rotated in the release direction by the wedge-shaped tip 55a. Can be made. Therefore, the lock gear 20 can be satisfactorily held in the release state by the release state holding unit 55. In particular, in this embodiment, since the upper end portion of the arc-shaped protrusion 26 is formed in an R shape, the lock gear 20 can be rotated more smoothly in the release direction by the wedge-shaped tip portion 55a. .

As shown in FIGS. 2 and 8, the spiral spring SP is a spring that urges the slide cam 30 toward the lock position via the rotating cam 40, and an inner end portion of the spiral cam SP rotates the rotating cam 40. The outer end of the moving shaft 41 is engaged with the spring engaging portion 16 protruding from the right surface of the base plate 10. Thereby, the urging force of the spiral spring SP can be transmitted to each lock gear 20 via the rotating cam 40 and the slide cam 30, so that each lock gear 20 can be firmly engaged with the internal gear 50. ing.

Further, the base plate 10 has three arcuate bulging portions 17 that project from the right side surface and that are formed in an arc shape around the axis of the base plate 10 or an example of the sliding resistance reducing portion, They are arranged so as to be arranged at intervals in the circumferential direction. Thereby, since the rigidity of the base plate 10 can be increased, the lock gear 20 and the like can be favorably held between the internal gear 50 and the base plate 10.

Also, the upper two arcuate bulges 17 of the three are provided adjacent to the periphery of each guide 12, specifically, the outside in the front-rear direction. Thereby, since each arcuate bulging portion 17 can increase the rigidity of each guide portion 12, the slide cam 30 can be favorably guided by each guide portion 12.

Further, the two arcuate bulging portions 17 described above are formed so as to bulge to the side opposite to each lock gear 20 at a position facing each lock gear 20 of the base plate 10. Thereby, since the sliding resistance between each lock gear 20 and the base plate 10 can be reduced, each lock gear 20 can be smoothly rotated.

Next, the operation of the reclining mechanism 1 will be described in detail.
As shown in FIG. 3A, when the occupant operates the operation lever in the release direction against the urging force of the spiral spring SP in a state where each lock gear 20 is in the locked posture, the rotating cam 40 rotates clockwise as shown in the figure. , The convex portion 37 is pushed upward by the first slot 44a of the rotating cam 40, and the slide cam 30 moves upward from the lock position.

After that, as shown in FIG. 4, the upper end portion 36 of the slide cam 30 that moves upward is brought into contact with the distal end portion of the second extending portion 25 of each lock gear 20 to push the distal end portion upward. Each lock gear 20 rotates from the lock posture toward the release posture, and when the slide cam 30 reaches the release position, each lock gear 20 is in the release posture. Here, even when the slide cam 30 reaches the release position, when the turning cam 40 turns clockwise in the drawing direction by the occupant in the release direction, the convex portion 37 moves by the second slot 44b. Therefore, only the rotation cam 40 can be rotated while the slide cam 30 is held at the release position. Thereby, when the occupant pulls the operation lever, it is possible to suppress an excessive load from being applied to the reclining mechanism 1.

Further, when the occupant releases the hand from the operation lever in the state where each lock gear 20 is in the release posture, the rotating cam 40 is rotated counterclockwise in the figure by the urging force of the spiral spring SP, and the rotating cam 40 The convex portion 37 is pushed downward by the first slot 44a, and the slide cam 30 moves downward. The slide cam 30 that moves downward first pushes the inclined surfaces 24c of the lock gears 20 downward at the outer ends of the first contact surfaces 31 in the front-rear direction, so that the lock gears 20 are changed from the release posture to the lock posture. Rotate toward.

Thereafter, when the lock gears 20 are in a substantially locked posture, the end portions on the outer sides in the front-rear direction of the first contact surfaces 31 of the slide cam 30 (corner portions between the first contact surfaces 31 and the first connection surfaces 34). Is disengaged from the inclined surface 24 c of each lock gear 20 and enters between the first surfaces 24 b of each lock gear 20. Thereby, each 2nd contact surface 32 of the slide cam 30 moves so that it may approach the inclined surface 24c of each lock gear 20, and by entering between each inclined surface 24c (R-shaped corner | angular part), Each lock gear 20 is firmly held in the locked posture by the wedge effect of each second contact surface 32.

As shown in FIG. 6, when the occupant tilts the seat back S2 forward while the lock gears 20 are in the release posture, the protruding portion 54 of the internal gear 50 becomes the rear rotation restricting portion 15. When the seat back S2 comes into contact with the seat back, the tilt of the seat back S2 toward the front side is restricted. In this state, each lock gear 20 is held in the release posture by the release state holding portion 55, so that each lock gear 20 is held in the release posture even if the occupant releases his hand from the operation lever. As a result, the occupant can move the seat back S2 without operating the operation lever until the seat back S2 is raised a little from the most forward position.

Further, as shown in FIG. 7, when the occupant tilts the seat back S2 rearward when each lock gear 20 is in the release posture, the protruding portion 54 of the internal gear 50 becomes the front rotation restricting portion 15. The rearward tilting of the seat back S2 is restricted when it comes into contact.

Further, as shown in FIG. 3A, when the lock gear 20 is in the locked posture, a collision load is applied to the vehicle seat S, and the upper portion of the lock gear 20 moves inwardly. Since the movement of the regulated surface 22c is regulated by the first regulating surface 14c, the engagement state between the upper portion of the lock gear 20 and the internal gear 50 can be maintained. Further, at this time, the first regulated surface 22c and the first regulating surface 14c for regulating the movement of the upper portion of the lock gear 20 are formed larger than the second regulated surface 22d and the second regulating surface 14d. Since the movement of the large first regulated surface 22c can be regulated by the large first regulating surface 14c, the engagement state between the upper portion of the lock gear 20 and the internal gear 50 can be maintained.

In addition, when the first restricted surface 22c or the first restricted surface 14c is deformed and the upper portion of the lock gear 20 moves inward during a collision, the contact between the second restricted surface 22d and the second restricted surface 14d occurs. The engaged state between the upper portion of the lock gear 20 and the internal gear 50 can be maintained by contact or contact between the second extending portions 25 of the lock gears 20.

Further, even when the lower part of the lock gear 20 in the locked posture moves at the time of a collision, the lower side of the lock gear 20 is brought into contact with each opposing surface 33a of the slide cam 30 and the second surface 24d of each lock gear 20. The engagement state between the portion and the internal gear 50 can be maintained.

Further, when a force is applied in the front-rear direction to the seat back S2 at the time of a collision, the force is applied to the internal gear 50 and the lock gear 20 because the moving direction of the slide cam 30 is set to the vertical direction. And is applied to the slide cam 30 in a direction perpendicular to the moving direction thereof. For this reason, it is possible to suppress the slide cam 30 from moving in the releasing direction, so that the engagement state between the lock gear 20 and the internal gear 50 can be maintained.

As described above, according to the present embodiment, the reclining mechanism 1 having a new configuration different from the conventional one can be provided.

[Second Embodiment]
Next, a second embodiment of the present invention will be described in detail with reference to the drawings as appropriate.
As shown in FIG. 9A, the reclining mechanism 2 includes a base plate 100, two lock gears 200, a slide cam 300, a rotation shaft 400 as an example of an operation member, and an internal gear 500. And a compression coil spring SP2 as an example of a first urging member. The base plate 100 is fixed to a cushion side frame F1 constituting the seat cushion S1. The internal gear 500 is rotatably supported by the base plate 100 via a ring, is fixed to the back side frame F2 constituting the seat back S2, and rotates integrally with the seat back S2. .

The rotation of the internal gear 500 with respect to the base plate 100 is regulated (locked) or allowed (released) by the lock gear 200 operated by the slide cam 300 or the like disposed between the base plate 100 and the internal gear 500. It has become. As a result, the tilting of the seat back S2 relative to the seat cushion S1 can be restricted or allowed depending on the operating state of the lock gear 200 or the like. Below, each member is demonstrated in detail.

The base plate 100 includes a disk-shaped base 110 and a pair (a plurality) of guide portions 120 and a coupling portion 130 that bulge from the base 110 to the left (internal gear 500 side).

A portion sandwiched between the pair of guide portions 120 in the left side surface of the base portion 110 faces the slide cam 300 in the axial direction of the internal gear 500, and a slide surface 111 for slidably supporting the slide cam 300. It has become. The slide surface 111 is formed so as to extend upward and downward from the central portion of the base 110.

The pair of guide portions 120 are portions that guide the slide cam 300 so as to be movable in the vertical direction, and are arranged so as to sandwich the slide surface 111 in the front-rear direction orthogonal to the movement direction of the slide cam 300. And the lower end part of each guide part 120 is couple | bonded by the coupling | bond part 130. FIG.

Thereby, since each guide part 120 protruding from the slide surface 111 is reinforced by the coupling part 130 protruding from the same slide surface 111, rigidity is ensured without increasing the size of each guide part 120 in the thickness direction. Can do. For this reason, it is possible to favorably support the slide cam 300 by the highly rigid guide portions 120.

Further, the pair of guide portions 120 and the coupling portion 130 are provided with arc-shaped recesses 140 for allowing the protrusions 540 formed on the internal gear 500 to move in the rotational direction of the internal gear 500. Yes. The protrusion 540 of the internal gear 500 enters the recess 140, and movement is restricted by both

end portions

141 and 142 in the rotation direction of the recess 140.

This makes it possible to regulate the amount of tilting of the seat back S2 that rotates integrally with the internal gear 500. In addition, by adopting a configuration in which the protruding portion 540 is inserted into the recess 140 in this way, for example, the pair of rotation restricting portions 15 that restrict the movement of the protruding portion 54 as in the first embodiment are used as a pair of guide portions. The reclining mechanism 2 can be reduced in size in the axial direction as compared with the structure formed so as to protrude from the side 12 to the internal gear 50 side.

The lock gear 200 is formed in a long shape extending along the circumferential direction of the internal gear 500, and is provided one by one with the slide cam 300 interposed therebetween in the front-rear direction orthogonal to the moving direction of the slide cam 300, and its lower end portion Is rotatably supported on a support shaft 150 fixed to the base plate 100. That is, the lock gear 200 is rotatably supported by the base plate 100 via the support shaft 150.

The lock gear 200 is rotatable between a locked posture (the posture in FIG. 9A) that meshes with the internal gear 500 and a released posture (the posture in FIG. 10) that is disengaged from the internal gear 500. Specifically, the lock gear 200 includes a substantially arc-shaped first extending portion 210 that extends upward from the support shaft 150 along the circumferential direction of the internal gear 500, and an inner side in the front-rear direction from the upper end portion of the first extending portion 210 ( And a second extending portion 220 extending in a direction away from the internal gear 500.

A plurality of gear teeth 211 that mesh with a plurality of internal teeth 510 formed on the internal gear 500 are provided on a part of the outer peripheral surface of the first extending portion 210. The second extending portion 220 is formed so as to extend inward in the front-rear direction from the upper end portion of the first extending portion 210, and then obliquely extend upward and inward in the front-rear direction, and the tip end portion thereof is tapered. ing.

The second extending portion 220 has an engagement surface 221, a lock-side pressed surface 222 as an example of a lock-side pressed portion, an engagement surface 221, and a lock-side pressed surface on the lower side (inward in the radial direction). A connection surface 223 that connects the surface 222 is provided, and a release-side pressed surface 224 as an example of a release-side pressed portion is provided on the upper side (radially outer side).

The engagement surface 221 is a surface that first comes into contact with the slide cam 300 when the lock gear 200 in the release posture (posture of FIG. 10) is pressed upward by the slide cam 300, and is inclined inward in the front-rear direction as it goes upward. It is formed to do. When the lock gear 200 is in the release posture, the engagement surface 221 is disposed so as to be opposed to and close to a contact surface 312 of a slide cam 300 described later.

The lock-side pressed surface 222 is a surface that receives a pressing force from the slide cam 300 when the lock gear 200 is in the locked posture, and is disposed at a position on the inner side in the front-rear direction and on the upper side than the engagement surface 221. Yes. The lock-side pressed surface 222 is formed so as to incline in the front-rear direction as it goes upward, so that the lock-side pressed surface 313 of the slide cam 300 (described later) is vertically aligned regardless of the posture of the lock gear 200. It is arranged at the opposite position.

When the lock gear 200 is in the locked posture, the connecting surface 223 extends upward from the edge on the inner side in the front-rear direction of the engagement surface 221 along the vertical direction, and then curves inward in the front-rear direction to be locked-side pressed surface. 222 to be coupled to 222. Further, the connecting surface 223 is in a non-contact state (with a gap) with the slide cam 300 when the lock gear 200 is in the locked posture. By making the connecting surface 223 and the slide cam 300 in non-contact in this way, the slide cam 300 is moved in the locking direction even when there are product errors and assembly errors in the components such as the lock gear 200 and the slide cam 300. At this time, since the slide cam 300 and the connecting surface 223 do not interfere with each other, only the end portion of each lock-side pressing surface 313 of the slide cam 300 can be brought into contact with each lock gear 20 at the time of locking, and the lock gear 200 is connected to the internal gear 500. It is possible to make it easy to mesh with the.

The release-side pressed surface 224 is a surface that comes into contact with the slide cam 300 when the lock gear 200 in the locked posture is pressed downward by the slide cam 300, and is formed to incline in the front-rear direction as it goes upward. Yes. The release-side pressed surface 224 is disposed at a position facing a contact portion 332 of the slide cam 300 described later in the vertical direction regardless of the posture of the lock gear 200.

The slide cam 300 is sandwiched between a pair of guide portions 120 and supported so as to be linearly movable in the vertical direction. The slide cam 300 presses the lock-side pressed surface 222 of the lock gear 200 upward to press the lock gear 200 toward the lock posture (the position in FIG. 9A, hereinafter also referred to as the lock position). ) And a second position where the lock gear 200 is pressed toward the release posture by pressing the release side pressed surface 224 of the lock gear 200 downward (the position in FIG. 10, hereinafter also referred to as the release position). It is configured.

According to this, since the lock gear 200 can be locked and released only by pressing the lock gear 200 with the slide cam 300, for example, a spring or the like for releasing the lock gear becomes unnecessary, and the number of parts increases. Can be suppressed. Further, since the slide cam 300 is configured to press one end portion of the lock gear 200 in the longitudinal direction, the lock gear 200 can be easily rotated as compared with a structure in which the center portion in the longitudinal direction of the lock gear is pressed by the slide cam, for example. The lock gear 200 can be locked or released satisfactorily and reliably.

Further, since the moving direction of the slide cam 300 is set to the vertical direction, when a force is applied in the front-rear direction to the seat back S2 at the time of a collision, the force is transferred via the internal gear 500 and the lock gear 200. 300 is added in a direction orthogonal to the moving direction. Therefore, the slide cam 300 can be prevented from moving in the release direction, so that the lock gear 200 can be maintained in the locked posture.

Specifically, the slide cam 300 includes a substantially rectangular slide portion 310 that is long in the vertical direction, a connecting portion 320 that extends upward from the upper end of the slide portion 310, and a release side that extends outward in the front-rear direction from the upper end of the connecting portion 320. And a pressing portion 330.

The slide portion 310 includes a pair of guided surfaces 311 guided by the guide portions 120, a pair of contact surfaces 312 formed so as to be inclined upward and inward in the front-rear direction from the upper end of each guided surface 311; It has a pair of lock side press surfaces 313 as an example of a lock side press part.

The contact surface 312 is a surface that comes into contact with the engagement surface 221 of the lock gear 200 in the initial stage of pressing the lock gear 200 in the release posture upward by the slide cam 300, and when the lock gear 200 is in the release posture, In addition to being parallel to the engagement surface 221 of 200, it is disposed close to the engagement surface 221.

The lock-side pressing surface 313 is a surface that presses the lock-side pressed surface 222 of the lock gear 200 when the lock gear 200 is in the locked posture, and is located on the inner side in the front-rear direction and on the upper side of the contact surface 312. Is arranged. Specifically, a connecting surface (reference numeral is omitted) is formed on the outer edge in the front-rear direction of the lock-side pressing surface 313, extending substantially downward and then bending outward in the front-rear direction to connect to the contact surface 312. A corner between the coupling surface and the lock-side pressing surface 313 is formed in an R shape. And the corner | angular part (end part of the front-back direction outer side of the lock side press surface 313) used as this R shape contact | abuts to the lock side pressed surface 222. FIG.

In addition, a long hole 314 is formed in the lower portion of the slide portion 310 along the vertical direction so as to penetrate the rotation shaft 400 in the left-right direction and allow the slide cam 300 to move. In addition, an engagement groove hole 315 that can be engaged with an engagement piece 410 of the rotation shaft 400 described later is formed in the slide portion 310 continuously with the elongated hole 314.

The connecting portion 320 is a portion that connects the slide portion 310 and the release-side pressing portion 330, is disposed adjacent to the inner side in the front-rear direction of the pair of lock-side pressing surfaces 313, and faces upward from each locking-side pressing surface 313. Are formed so as to extend along the vertical direction. The connecting portion 320 is formed with such a width that a gap is formed between the connecting portion 320 and the distal end portion (second extending portion 220) of the lock gear 200 when the lock gear 200 is in the release posture. Thereby, when the lock gear 200 is released, the distal end portion of the lock gear 200 does not come into contact with the connecting portion 320, so that the release operation of the lock gear 200 can be performed smoothly.

The release-side pressing portion 330 has a main body portion 331 formed in an arc shape along the inner peripheral surface of the internal gear 500, and a pair of contact portions 332 formed at both ends of the main body portion 331. ing. Each contact portion 332 is formed in a columnar shape, protrudes downward (inward in the radial direction) from the main body portion 331, and is configured such that an outer peripheral surface thereof contacts the release-side pressed surface 224.

Since the abutment portion 332 that abuts against the release-side pressed surface 224 protrudes from the main body portion 331, the rigidity of the release-side press portion 330 as a whole can be increased. The pressing surface 224 can be suitably pressed. Further, each contact portion 332 and each release side pressed surface are formed by forming each contact portion 332 in a columnar shape, that is, by making the contact surface of each contact portion 332 with each release side pressed surface 224 a curved surface. Since the sliding contact resistance with 224 can be reduced, the releasing operation of the lock gear 200 can be performed smoothly. Furthermore, by forming the main body portion 331 in an arc shape along the inner peripheral surface of the internal gear 500, for example, compared with a case where the main body portion is formed in a rectangular shape, interference between the main body portion 331 and the internal gear 500 is suppressed. It is possible.

The rotation shaft 400 is a member for moving the slide cam 300 downward, and is configured to rotate in conjunction with an operation lever (not shown) operated by an occupant. The rotating shaft 400 has an engagement piece 410 that protrudes radially outward from the outer peripheral surface and engages with the engagement groove hole 315 of the slide cam 300 on a part of the outer peripheral surface. Accordingly, when the rotation shaft 400 is rotated clockwise in the figure when the lock gear 200 is in the locked posture, the engagement groove hole 315 is pressed downward by the engagement piece 410 and the slide cam 300 is moved downward. It is supposed to move.

The internal gear 500 protrudes toward the base plate 100 from the disc portion 520 (see FIG. 9B) as an example of the facing portion that faces the base plate 100 in the axial direction, and from the outer peripheral portion of the disc portion 520. It has a ring-shaped internal tooth forming portion 530 having internal teeth 510 on the peripheral side.

The disc portion 520 is a portion that forms a housing that accommodates each lock gear 200 and the slide cam 300 between the disc portion 520 and a portion corresponding to the recess 140 formed in the guide portion 120 of the base plate 100. A protrusion 540 that protrudes toward the base plate 100 is provided.

The compression coil spring SP2 is a spring that biases the slide cam 300 toward the lock position, and is disposed between the slide cam 300 and the coupling portion 130 of the base plate 100 and supported by the coupling portion 130. As a result, the urging force of the compression coil spring SP2 can be transmitted to each lock gear 200 via the slide cam 300, so that each lock gear 200 can be firmly engaged with the internal gear 500. Further, for example, compared to a structure in which a portion for supporting the compression coil spring is newly formed separately from the coupling portion, the compression coil spring SP2 is supported by using the coupling portion 130, so that the reclining mechanism 2 can be simplified. It has become. Furthermore, since the compression coil spring SP2 can be favorably supported by the highly rigid coupling portion 130, the slide cam 300 can be favorably operated.

Next, the operation of the reclining mechanism 2 will be described in detail.
As shown in FIG. 9A, when the occupant operates the operation lever in the release direction in a state where the lock gears 200 are in the locked posture, the rotation shaft 400 rotates clockwise in the figure, so that the rotation shaft The engagement groove 410 of the slide cam 300 is pushed downward by the engagement piece 410 of 400, and the slide cam 300 moves downward from the lock position against the urging force of the compression coil spring SP2. At this time, since the slide cam 300 is guided by the pair of guide portions 120 whose rigidity is increased by the coupling portion 130, the slide cam 300 moves favorably toward the lower release position.

Thereafter, as shown in FIG. 10, each contact portion 332 of the slide cam 300 that moves downward contacts the release-side pressed surface 224 of each lock gear 200 and moves the release-side pressed surface 224 downward. By pushing down, each lock gear 200 rotates from the locked position to the released position, and when the slide cam 300 reaches the released position, each lock gear 200 is in the released position.

In the state where each lock gear 200 is in the release posture, when the occupant releases his / her hand from the operation lever, the slide cam 300 moves upward by the urging force of the compression coil spring SP2. At this time, the slide cam 300 is guided by the pair of guide portions 120 whose rigidity is increased by the coupling portion 130, and therefore, the slide cam 300 moves favorably toward the upper lock position. The slide cam 300 that moves upward first pushes the engagement surface 221 of each lock gear 200 upward at each contact surface 312, thereby rotating each lock gear 200 from the release posture to the lock posture.

Thereafter, when the lock gears 200 are substantially locked, the contact surfaces 312 of the slide cams 300 are disengaged from the engagement surfaces 221 of the lock gears 200 and enter between the lock gears 200. As a result, each lock-side pressing surface 313 of the slide cam 300 moves so as to approach the lock-side pressed surface 222 of each lock gear 200, and each lock-side pressed surface 222 is pressed, whereby each lock gear 200. Is held in the locked position.

[Third Embodiment]
Next, a third embodiment of the present invention will be described in detail with reference to the drawings as appropriate. In addition, since this embodiment changes a part of structure of the reclining mechanism 1 which concerns on 1st Embodiment mentioned above, about the component substantially the same as 1st Embodiment, the same code | symbol is attached | subjected. The description is omitted.

As shown in FIGS. 16 and 17, the reclining mechanism 3 according to the third embodiment allows the lock gears 20 to move to each other when the slide cam 30 is moved from the release position (position of FIG. 16) toward the lock position. It is configured to mesh with the internal gear 50 at different timings (see FIGS. 16B and 16C). Accordingly, for example, compared to a structure in which the two lock gears 20 are simultaneously meshed with the internal gear 50 as in the first embodiment, the two lock gears 20 can be easily meshed with the internal gear 50. .

Specifically, the reclining mechanism 3 according to the third embodiment differs from the first embodiment in that the first contact surface on the front side of the pair of

first contact surfaces

31A and 31B formed on the slide cam 30 is different. The front end A1 of 31A is formed to be positioned above the rear end B1 of the rear first contact surface 31B. That is, when the slide cam 30 is located at the release position, the distance in the vertical direction from the front end A1 of the front first contact surface 31A to the front lock gear 20 is the rear first contact surface 31B. The inclinations of the

first contact surfaces

31A and 31B are set so as to be larger than the distance in the vertical direction from the rear end B1 to the rear lock gear 20.

In the third embodiment, the front lock gear 20 corresponds to the first lock gear, the front end A1 of the front first contact surface 31A corresponds to the first pressing portion, and the rear lock gear 20 Corresponds to the second lock gear, and the rear end B1 of the rear first contact surface 31B corresponds to the second pressing portion.

According to this, since the inclination of each of the

first contact surfaces

31A and 31B is made different, the timing with which each lock gear 20 meshes with the internal gear 50 can be shifted with a simple structure.

Next, the operation of the reclining mechanism 3 will be described in detail. In the following description, for the sake of convenience, the reference numeral of the front lock gear 20 is also indicated as 20A, and the reference numeral of the rear lock gear 20 is also indicated as 20B.

As shown in FIG. 16, when the operating lever that the occupant grips is released in a state where each lock gear 20 is in the release posture, the urging force of the spiral spring SP (see FIG. 2) slides through the rotating cam 40. The slide cam 30 is transmitted to the cam 30 and moved downward. Then, before the first contact surface 31A on the front side of the slide cam 30 contacts the front lock gear 20A, the first contact surface 31B on the rear side contacts the lock gear 20B on the rear side, so that the front lock gear 20A. Prior to this, the rear lock gear 20B rotates.

As shown in FIG. 17A, when the first contact surface 31A on the front side of the slide cam 30 contacts the front lock gear 20A, the front lock gear 20A starts to rotate with a delay from the rear lock gear 20B. As a result, as shown in FIGS. 17B and 17C, the rear lock gear 20B starts to mesh with the internal gear 50 before the front lock gear 20A, and the front lock gear 20A is delayed after this. Since it engages with the gear 50, each lock gear 20 can be easily engaged with the internal gear 50.

Finally, as in the first embodiment, the lock gears 20 are pressed toward the lock posture by the second contact surfaces 32 of the slide cam 30 (see FIG. 3A). In addition, since the operation | movement which rotates each lock gear 20 from a locked attitude | position to a releasing attitude | position is the same as that of 1st Embodiment, the description is abbreviate | omitted.

[Fourth Embodiment]
Next, a fourth embodiment of the present invention will be described in detail with reference to the drawings as appropriate. In addition, since this embodiment changes a part of structure of the reclining mechanism 1 which concerns on 1st Embodiment mentioned above, about the component substantially the same as 1st Embodiment, the same code | symbol is attached | subjected. The description is omitted.

As shown in FIG. 18, the reclining mechanism 4 according to the fourth embodiment is different from the first embodiment in that the second urging force is used instead of pressing each lock gear 20 toward the release posture with the slide cam 30. As an example of a member, each lock gear 20 is pressed toward the release posture by two leaf springs SP3.

The plate spring SP3 is provided between the guide portion 12 and the second extending portion 25 of the lock gear 20, and supports the second extending portion 25 to hold the lock gear 20 in the released posture.

The leaf spring SP3 is set to a biasing force smaller than the biasing force of the spiral spring SP (see FIG. 2). Specifically, each of the slide cams 30 that move in the locking direction by the urging force of the spiral spring SP is more than the force that each locking gear 20 that rotates in the releasing direction by the urging force of each leaf spring SP3 presses the slide cam 30 upward. The urging forces of the leaf springs SP3 and the spiral springs SP are set so that the force that presses the lock gear 20 downward increases.

The slide cam 30 is formed such that, when each lock gear 20 is in the release posture, its upper end 30a is separated downward from the second extension portion 25 of each lock gear 20, and the second extension of each lock gear 20 is provided. The portion 25 is configured not to be pressed in the release direction. Then, the slide cam 30 has a third position (a position in FIG. 19, hereinafter also referred to as a lock position) that presses each lock gear 20 toward the lock position, and each lock gear 20 by the leaf spring SP3 away from the lock position. It is configured to be movable to a fourth position where the rotation is permitted (the position in FIG. 18, hereinafter also referred to as the release position).

Next, the operation of the reclining mechanism 4 according to the fourth embodiment will be described in detail.
As shown in FIG. 19, when the occupant operates the operation lever in the releasing direction against the urging force of the spiral spring SP in a state where each lock gear 20 is in the locked posture, the rotating cam 40 rotates clockwise in the figure. As a result, the slide cam 30 moves upward from the lock position.

Thereafter, when the lower end portion of the slide cam 30 is pulled upward from between the lower end portions of the lock gears 20, the restriction of the rotation of the lock gears 20 in the release direction by the slide cam 30 is released, and the leaf springs SP3 are attached. Each lock gear 20 starts to rotate in the release direction due to the force. Then, as shown in FIG. 18, when the slide cam 30 moves to the release position, each lock gear 20 assumes the release posture.

Further, when the occupant releases the hand from the operation lever in a state where each lock gear 20 is in the release posture, the rotating cam 40 is rotated counterclockwise by the urging force of the spiral spring SP, and the slide cam 30 is moved downward. Move to. When the lower end portion of the slide cam 30 comes into contact with the lower end portion of each lock gear 20, the slide cam 30 rotates each lock gear 20 in the locking direction against the urging force of each leaf spring SP3. Thereafter, by the same operation as in the first embodiment, the lower end portion of the slide cam 30 enters between the lower end portions of the lock gears 20, and the lock gears 20 are in the locked posture.

[Fifth Embodiment]
Next, a fifth embodiment of the present invention will be described in detail with reference to the drawings as appropriate. In addition, since this embodiment changes a part of structure of the reclining mechanism 1 which concerns on 1st Embodiment mentioned above, about the component substantially the same as 1st Embodiment, the same code | symbol is attached | subjected. The description is omitted.

As shown in FIG. 20, the reclining mechanism 5 according to the fifth embodiment is different from the first embodiment in that a third urging force is used instead of pressing each lock gear 20 toward the lock posture with the slide cam 30. As an example of the member, each lock gear 20 is directly pressed toward the lock posture by a compression coil spring SP4. That is, in the fifth embodiment, a compression coil spring SP4 is provided instead of the spiral spring SP provided in the first embodiment.

The compression coil spring SP4 is provided between the lower end portions of the lock gears 20 and applies an urging force to the lower end portions of the lock gears 20 in directions away from each other, thereby urging the lock gears 20 toward the lock posture. ing. Specifically, both ends of the compression coil spring SP4 are supported by a support shaft 24e protruding inward in the front-rear direction from the first surface 24b of each lock gear 20.

The slide cam 30 is formed such that, when each lock gear 20 is in the locked posture (the posture of FIG. 21), the lower end portion 30b is separated upward from the lower end portion of each lock gear 20, and each lock gear 20 is locked in the locking direction. It is comprised so that it may not press on. The slide cam 30 has a fifth position (the position in FIG. 20, hereinafter also referred to as a release position) that presses each lock gear 20 toward the release posture, and a downward distance from the release position to each of the compression cam springs SP4. The lock gear 20 is configured to be movable to a sixth position that permits the rotation of the lock gear 20 (the position in FIG. 21, hereinafter also referred to as a lock position).

Next, the operation of the reclining mechanism 5 according to the fifth embodiment will be described in detail.
As shown in FIG. 20, when the occupant returns the operation lever to the original position (position for bringing the reclining mechanism 5 into the locked state) in a state where each lock gear 20 is in the release posture, the rotating cam 40 is not illustrated. It rotates clockwise and the slide cam 30 moves to the lower locking position. Accordingly, each lock gear 20 held in the release posture by the slide cam 30 is rotated in the lock direction by the urging force of the compression coil spring SP4 to be in the lock posture as shown in FIG. 21. The method of moving the slide cam 30 to the lock position shown in FIG. 21 is not limited to the method in which the operation lever is manually operated to the original position as described above. For example, the rotation cam 40 is locked. A new spring for biasing in the direction may be provided, and a restricting portion for restricting the downward movement of the slide cam 30 at the lock position may be provided.

In addition, when the occupant operates the operation lever in the release direction in a state where each lock gear 20 is in the locked posture, the rotation cam 40 rotates clockwise in the drawing, so that the slide cam 30 is directed upward from the lock position. Moving. Thereafter, when the upper end portion 36 of the slide cam 30 contacts the second extending portion 25 of each lock gear 20, the slide cam 30 rotates each lock gear 20 in the release direction against the urging force of the compression coil spring SP4. Then, as shown in FIG. 20, when the slide cam 30 moves to the release position, each lock gear 20 assumes the release posture.

[Sixth Embodiment]
Next, a sixth embodiment of the present invention will be described in detail with reference to the drawings as appropriate.
As shown in FIG. 22, the reclining mechanism 801 according to this embodiment includes a base plate 810, two lock gears 820, a slide cam 830 as a cam, an operation member 840, a biasing member 850, and an internal gear 860. And a ring 870.

The base plate 810 is fixed to a cushion side frame F1 (see FIG. 1) constituting the seat cushion S1. The internal gear 860 is rotatably supported with respect to the base plate 810 via a ring 870, is fixed to the back side frame F2 (see FIG. 1) constituting the seat back S2, and rotates together with the seat back S2. It comes to move.

The rotation of the internal gear 860 relative to the base plate 810 is restricted or permitted by a lock gear 820 that is operated by a slide cam 830 or the like. Thereby, it is possible to restrict or allow the tilt of the seat back S2 with respect to the seat cushion S1. Hereinafter, the configuration of each member will be described in detail.

The base plate 810 includes a disk-shaped base portion 811, an annular outer peripheral wall portion 812 extending leftward from the outer peripheral portion of the base portion 811, a pair of guide portions 813 protruding from the base portion 811 to the left side (the lock gear 820 side), and a pair The shaft support portion 814, the support convex portion 815, the plurality of load receiving portions 816, and the engaged portion 817 provided on the base portion 811.

The base portion 811 is a portion facing each lock gear 820, slide cam 830, etc. in the left-right direction (in the direction of the rotational axis of the internal gear 860), and has a through hole 811B penetrating in the left-right direction at the center viewed from the left-right direction. is doing. The through hole 811 B is a hole through which a rotation shaft 891 (see FIG. 25) of an operation lever (not shown) that rotates the operation member 840 is inserted.

The pair of guide portions 813 are portions for guiding the movement of the slide cam 830. As shown in FIG. 23, the rotation center C of the internal gear 860 and the operation member 840 (see FIG. 22) is seen from the left-right direction. And is provided symmetrically with respect to a straight line L81 that is parallel to the vertical direction (the moving direction of the slide cam 830). Specifically, the pair of guide portions 813 are arranged so as to sandwich the through hole 811B and the slide cam 830 in the front-rear direction (the orthogonal direction orthogonal to the moving direction of the slide cam 830). It has a slide cam guide surface 813A that faces the slide cam 830 in the direction and supports the slide cam 830 so as to be slidable in the vertical direction. Since the pair of guide portions 813 are disposed so as to sandwich the through hole 811B, the through hole 811B is disposed between the portions having high rigidity protruding from the base portion 811. Therefore, the rigidity of the base plate 810 is determined. Can be increased.

As shown in FIG. 24, each guide portion 813 has a base-side rotation restricting convex portion 813B and an adjacent convex portion 813C protruding on the left side (the facing portion 861 side of the internal gear 860) on the left side. Yes.

As shown in FIGS. 25A and 25B, the base side rotation restricting convex portion 813B is a gear when the gear side rotation restricting convex portion 863 (see also FIG. 27) of the internal gear 860 contacts. By restricting the movement of the side rotation restricting convex portion 863, it is a part that restricts the amount of rotation of the internal gear 860. By having such a base side rotation restricting convex portion 813B and a gear side rotation restricting convex portion 863, the vehicle seat S restricts the amount of tilting of the seat back S2 that rotates together with the internal gear 860. It is possible.

The adjacent convex portion 813C is disposed adjacent to the base side rotation restricting convex portion 813B in the rotational direction of the internal gear 860. More specifically, the adjacent convex portion 813C has a base side rotation restricting convex portion with a predetermined space between the adjacent convex portion 813C and the base side rotational restricting convex portion 813B below the base side rotational restricting convex portion 813B. Arranged adjacent to the portion 813B.

Each base side rotation restricting convex portion 813B and each adjacent convex portion 813C have an operation member guide surface 813D on the radially inner side of a circle with the rotation center C as the center. The operating member guide surface 813D is a surface that slides on the outer peripheral surface of the operating member 840 and guides the rotation of the operating member 840, and is a curved surface that is curved in a substantially arc shape with the rotation center C as the center when viewed from the left-right direction. It is formed in a shape. Since the operation member guide surface 813D is formed as a part of the guide portion 813 as described above, the operation member has a compact configuration compared to the configuration in which the rotating cam guide surface is provided in a portion different from the guide portion. 840 can be rotated well. Thus, the slide cam 830 driven by the operation member 840 can be favorably operated with a compact configuration.

As shown in FIG. 23 and FIG. 24, the shaft support portion 814 is a convex portion provided on the base portion 811 that functions as a rotation shaft that rotatably supports the

lock gear

820, and 1 on the upper side of each guide portion 813. It is arranged one by one. Similarly to the pair of guide portions 813, the pair of shaft support portions 814 are provided symmetrically with respect to the straight line L81 when viewed from the left-right direction. In the present embodiment, the base plate 810 is formed symmetrically with respect to the straight line L81 when viewed from the left-right direction.

The support convex portion 815 is a portion that receives a load from the lock gear 820, specifically, a load in the rotational direction of the internal gear 860, and is disposed between the pair of shaft support portions 814 in the front-rear direction. More specifically, the support convex portion 815 has an upper end portion (one end portion of the first lock gear 820A in the circumferential direction of the internal gear 860) and an upper end portion (internal gear) of the second lock gear 820B in the front-rear direction. 860 and one end portion of the second lock gear 820B in the circumferential direction). Further, the support convex portion 815 is opposite to the pair of guide portions 813 with respect to the straight line L82 that connects the upper ends (support convex portion 815 side) of the pair of guide portions 813, that is, above the straight line L82. Is arranged.

The support convex portion 815 is formed in a shape in which the width of the central portion in the vertical direction (the radial direction of the circle centered on the rotation center C) is smaller than the width of the upper and lower end portions. In other words, the support convex portion 815 is formed in a shape in which the central portion in the vertical direction is recessed inward in the front-rear direction with respect to the upper and lower end portions. More specifically, the support convex portion 815 includes a first gear support surface 815A disposed on the front side (one side) of the support convex portion 815 and the rear side of the support convex portion 815 (in the rotational direction of the internal gear 860). And a second gear support surface 815B disposed on the other side. The first gear support surface 815A is formed in an arc shape centered on the front shaft support portion 814 (rotation center of the first lock gear 820A) when viewed from the left-right direction, and the second gear support surface 815B is formed in the left-right direction. As viewed from the rear side, it is formed in an arcuate shape centering on the rear shaft support portion 814 (the rotation center of the second lock gear 820B).

The first gear support surface 815A is in contact with a contact surface 825B, which is a part of a side surface of the first lock gear 820A as viewed from the left-right direction, and the rotational direction of the internal gear 860 from the first lock gear 820A. It is the surface that receives the load of. Further, the second gear support surface 815B is in contact with a contact surface 825B that is a part of the side surface of the second lock gear 820B as viewed from the left-right direction, so that the internal gear 860 rotates from the second lock gear 820B. It is the surface that receives the load in the moving direction.

The load receiving portion 816 is a portion that receives a load in the rotational direction of the internal gear 860 from the lock gear 820, similarly to the support convex portion 815. The load receiving portion 816 includes a first load receiving portion 816A disposed on the upper side in the front and rear direction of the pair of guide portions 813 and a second load receiving portion disposed on the lower side in the front and rear direction of the pair of guide portions 813. Part 816B. Each of the

load receiving portions

816A and 816B has a pair of surfaces facing the rotation direction of the internal gear 860 and a pair of surfaces facing the radial direction of the circle centering on the rotation center C when viewed from the left-right direction. It is formed in a substantially square shape. The load receiving surface of each

load receiving portion

816A, 816B is formed in a substantially arc shape along the circumference of a circle centering on the shaft support portion 814 (the rotation center of the lock gear 820) when viewed from the left-right direction. Yes.

The engaged portion 817 is a groove-like concave portion that is provided in the lower portion of the base portion 811 and extends in the up-down direction. Like the pair of guide portions 813, the engaged portion 817 is provided symmetrically with respect to the straight line L81. Yes. The engaged portion 817 has an upper end inside a region (region sandwiched between the pair of guide portions 813) between the straight line L82 and a straight line L83 connecting the lower ends of the pair of guide portions 813. The portion below the upper end is disposed outside the region sandwiched between the pair of guide portions 813 (below the straight line L83). That is, the engaged portion 817 is disposed from the region sandwiched between the pair of guide portions 813 to the outside of the region. According to such a configuration, a part of the concave engaged portion 817 is disposed in a region sandwiched between the pair of convex guide portions 813 having high rigidity. Even if the joining portion 817 is formed long, a decrease in rigidity of the base plate 810 can be suppressed.

As shown in FIG. 26, the base plate 810 has a positioning convex portion 818 and a welding convex portion 819 that protrude from the base portion 811 to the right side (the side opposite to the lock gear 820 and the slide cam 830 side).

The positioning convex part 818 is a part for determining the position of the base plate 810 with respect to the cushion side frame F1 (see FIG. 1) of the seat cushion S1. More specifically, the position of the base plate 810 with respect to the seat cushion S1 is determined by the positioning convex portion 818 engaging with a concave portion provided on a base plate fixing surface (not shown) of the cushion side frame F1.

Two positioning protrusions 818 are provided on the base plate 810. Specifically, as shown in FIG. 23, the positioning convex portion 818 is provided one by one on the front side and the rear side of the support convex portion 815 when viewed from the left-right direction, and is disposed adjacent to the support convex portion 815. Yes. Further, when viewed from the support convex portion 815 side, the support convex portion 815 is disposed on a straight line L84 that connects the centers of two positioning convex portions 818 adjacent to each other in the front-rear direction when viewed from the left-right direction.

According to such a configuration, since the positioning convex portion 818 is disposed near the portion having the high rigidity provided with the support convex portion 815, the positioning accuracy of the base plate 810 with respect to the seat cushion S1 is improved. Can do. In addition, since the support convex portion 815 that is provided near each other protrudes to the left side and the positioning convex portion 818 protrudes to the right side, an uneven shape is formed in the vicinity of the support convex portion 815 of the base portion 811, and the vicinity of the support convex portion 815. The rigidity of the base plate 810 can be increased. In particular, in the present embodiment, since the positioning convex portions 818 are arranged adjacent to both sides of the support convex portion 815, the rigidity of the base plate 810 is further improved compared to a configuration in which only one positioning convex portion is provided. Can be increased.

26, the welding convex portion 819 is a portion for fixing the base plate 810 to the cushion side frame F1 (see FIG. 1) of the seat cushion S1 by welding. More specifically, the base plate 810 is welded to the weld projection 819 and the cushion side frame F1 in a state where the weld projection 819 is engaged with a recess provided on the base plate fixing surface of the cushion side frame F1. The seat cushion S1 is fixed. A plurality of welding projections 819 are provided, and have a pair of first welding projections 819A arranged opposite to each other in the front-rear direction, and one second welding projection 819B arranged at the lower end of the base 811. ing.

The base plate 810 is formed by pressing a metal plate. Thereby, as shown in FIG. 24, the second welding projection 819B forms a welding recess 819D having a concave shape on the back (surface of the base portion 811 on the slide cam 830 side). The lower end portion of the engaged portion 817 is connected to the center portion in the front-rear direction of the weld recess 819D. More specifically, the engaged portion 817 and the weld recess 819D have substantially the same depth and are formed as one continuous recess having a substantially T shape when viewed from the left-right direction.

Further, since the base plate 810 is formed by pressing a metal plate, the base plate 810 has a concave shape behind the base side rotation restricting convex portion 813B as shown in FIGS. A first concave portion 813E is formed, and a second concave portion 813F having a concave shape is formed behind the adjacent convex portion 813C. According to such a configuration, the first concave portion 813E and the second concave portion 813F, in which one large concave portion extending vertically (a concave portion in which the

concave portions

813E and 813F are continuous) extend so as to connect the front and rear walls of the concave portion. Since the convex portion 813G is divided into small concave portions, a reduction in rigidity of the guide portion 813 can be suppressed as compared with a configuration in which one large concave portion is formed.

22 and FIG. 27, the internal gear 860 is a member that forms a housing that houses the lock gear 820, the slide cam 830, the operation member 840, and the biasing member 850 together with the base plate 810. The internal gear 860 includes a disc-shaped facing portion 861, an annular internal tooth forming portion 862 that extends to the right from the outer peripheral portion of the facing portion 861, and a gear that protrudes to the right (base plate 810 side) from the facing portion 861. It has a side rotation restricting convex portion 863 and four welding convex portions 864 projecting leftward from the facing portion 861.

The facing portion 861 is a portion that faces the base portion 811 of the base plate 810 in the left-right direction, and holds the lock gear 820, the slide cam 830, the operation member 840, and the like between the base portion 811.

The inner tooth forming portion 862 has inner teeth 862A on the inner peripheral portion, and is formed to engage with the inner side of the outer peripheral wall portion 812 of the base plate 810.

The welding convex part 864 is a part for fixing the internal gear 860 to the back side frame F2 (see FIG. 1) of the seat back S2 by welding. More specifically, the internal gear 860 includes the welding projection 864 and the back side frame F2 in a state where the welding projection 864 is engaged with a recess provided on an internal gear fixing surface (not shown) of the back side frame F2. Is fixed to the seat back S2.

23, the lock gear 820 is a member that switches between a state of restricting the rotation of the internal gear 860 relative to the base plate 810 and a state of allowing the rotation. More specifically, the lock gear 820 is disengaged from the lock posture (the posture of FIG. 30) that restricts the rotation of the internal gear 860 by meshing with the internal teeth 862A of the internal gear 860 and the internal teeth 862A of the internal gear 860. Thus, the base plate 810 can be rotated (displaceable) so that the internal gear 860 can be displaced with respect to the release posture (posture of FIG. 31) that allows the internal gear 860 to rotate. It is supported by.

Two lock gears 820 are provided and include a first lock gear 820A and a second lock gear 820B. In the first lock gear 820A and the second lock gear 820B, the first lock gear 820A is disposed on the front side of the pair of guide portions 813 with the pair of guide portions 813 interposed therebetween, and the second lock gear 820B is disposed on the rear side of the pair of guide portions 813. Is arranged. The first lock gear 820A and the second lock gear 820B are formed symmetrically with respect to the straight line L81.

Each lock gear 820 is formed in a long shape that is curved and extends along the circumferential direction (rotation direction) of the internal gear 860, and the internal gear 860 is formed on the outer peripheral surface from the central portion to the lower end in the circumferential direction. A plurality of gear teeth 821 that can mesh with the inner teeth 862A are provided.

As shown in FIG. 28, each lock gear 820 has a long hole portion 822 and a load transmission portion 823 on the surface on the base 811 side.

The long hole portion 822 is a recess that extends long in the circumferential direction of the internal gear 860, and is disposed at the upper end portion (one end portion in the circumferential direction) of the lock gear 820. The elongated hole portion 822 has a pivoted support portion 822A and an extending recess 822B extending along the circumferential direction of the internal gear 860 so as to go from the pivoted support portion 822A toward the lower end portion of the lock gear 820.

The shaft-supported portion 822A is a recess that engages with the shaft-supporting portion 814 of the base plate 810, and is formed in an arc shape having a central angle larger than 180 ° when viewed from the left-right direction. Further, the width of the pivotally supported portion 822A (the length in the radial direction of the circle around the rotation center C) is larger than the width of the extending recess 822B.

The load transmitting portion 823 is a portion that receives a load in the rotational direction of the internal gear 860 from the load receiving portion 816, more precisely, a portion that receives a reaction force of the load applied to the load receiving portion 816. The base plate 810 It is formed as a concave portion that engages with the convex load receiving portion 816. Two load transmission portions 823 are provided for each lock gear 820, and the first load transmission portion 823A that engages with the first load receiving portion 816A and the second load transmission portion 823B that engages with the second load reception portion 816B. Including.

The first load transmitting portion 823A is disposed at a position corresponding to the first load receiving portion 816A. Specifically, the first load transmitting portion 823A is obliquely below the elongated hole portion 822 and above the center of the lock gear 820 in the circumferential direction of the internal gear 860, and the elongated hole portion 822 (extension recess 822B). It is arranged adjacent to. Further, the second load transmitting portion 823B is disposed at a position corresponding to the second load receiving portion 816B. Specifically, the second load transmission portion 823B is opposite to the elongated hole portion 822 (the pivoted support portion 822A) across the first load transmission portion 823A in the circumferential direction of the internal gear 860, and in the circumferential direction. It is arranged below the center of the lock gear 820.

Each

load transmitting portion

823A, 823B includes a pair of surfaces opposed in the rotational direction of the internal gear 860 and a pair of surfaces opposed in the radial direction of the circle centered on the rotational center C when viewed from the left-right direction. It is formed in the substantially square shape which has. In order to allow the rotation of the lock gear 820 relative to the base plate 810, each

load transmitting portion

823A, 823B has a first load transmitting portion 823A formed in a square shape larger than the first load receiving portion 816A, and the second load transmitting portion 823B. Is formed in a rectangular shape larger than the second load receiving portion 816B.

The long hole part 822 (supported part 822A) and the load transmission part 823 are arranged inside the corresponding ring of the lock gear 820 when viewed from the left-right direction. Thereby, the long hole part 822 and the load transmission part 823 are formed as the recessed part of the collar which was closed seeing from the left-right direction. Further, the shaft support 814 and the load receiving portion 816 provided on the base plate 810 correspond to the shaft supported portion 822A and the load transmission portion 823, as in the case of the shaft supported portion 822A and the load transmission portion 823. The lock gear 820 is disposed inside the collar.

Each lock gear 820 has a lock-side pressed portion 824 at the lower end, and is pressed at the upper end (the tip on the one end side in the circumferential direction of the internal gear 860 rather than the portion where the pivoted support portion 822A of the lock gear 820 is disposed). It has a release side pressed part 825 as a part.

The lock-side pressed portion 824 is a portion that is pressed by the slide cam 830 when the lock gear 820 is rotated from the release posture to the lock posture. The lock-side pressed portion 824 of each lock gear 820 has a first abutting surface 824A extending substantially in the vertical direction on the inner side in the front-rear direction, and obliquely upward on the outer side in the front-rear direction from the upper end of the first abutting surface 824A. From the first inclined surface 824B extending toward the upper side, the second abutted surface 824C as the abutted surface extending substantially vertically from the upper end of the first inclined surface 824B, and the upper end of the second abutted surface 824C A second inclined surface 824D extending obliquely upward on the outer side in the front-rear direction.

When the lock gear 820 is in the locked position shown in FIG. 28, the first abutted surface 824A and the second abutted surface 824C are in contact with the slide cam 830, and the gear teeth 821 are the internal teeth 862A of the internal gear 860. Are engaged.

In the present embodiment, the load transmitting portion 823, in particular the second load transmitting portion 823B, is a position where the distance to the second contacted surface 824C is larger than the distance to the outer peripheral surface (gear tooth 821) of the lock gear 820, in other words. For example, it is arranged at a position close to the gear tooth 821 side. According to such a configuration, the load transmitting portion 823 is disposed at a position far from the second abutted surface 824C that receives the force from the slide cam 830, so that deformation of the concave load transmitting portion 823 is suppressed. be able to. Thereby, since the load can be received by the load transmission portion 823 while the lock gear 820 is rotated well, the load applied to the shaft support portion 814 and the shaft support portion 822A can be reduced.

The release-side pressed portion 825 is a portion that is pressed by the slide cam 830 when the lock gear 820 is rotated from the lock posture to the release posture. The release-side pressed portion 825 is formed to have a width larger than the width of the portion where the pivot support portion 822A is disposed. Specifically, a portion of the upper end portion of the first lock gear 820A on the front end side relative to the portion where the pivoted support portion 822A is disposed is formed to extend between the support convex portion 815 and the front guide portion 813. A portion of the upper end portion of the second lock gear 820B on the front end side with respect to the portion where the pivoted support portion 822A is disposed is formed to extend between the support convex portion 815 and the rear guide portion 813. . According to such a configuration, since the upper end portion of the lock gear 820 is disposed between the support convex portion 815 and the guide portion 813, the lock gear 820 is stably supported by the base plate 810. be able to.

The release-side pressed portion 825 of each lock gear 820 has a pressed surface 825A that is pressed by the slide cam 830 and a contact surface 825B that contacts the gear support surfaces 815A and 15B of the lock gear 820.

A contact surface 825B (first contact surface) that contacts the first gear support surface 815A of the first lock gear 820A is centered on the shaft support portion 814 on the front side when viewed from the left and right directions so as to coincide with the first gear support surface 815A. It is formed in a circular arc shape. Further, a contact surface 825B (second contact surface) that contacts the second gear support surface 815B of the second lock gear 820B is a rear shaft support portion 814 when viewed from the left and right directions so as to coincide with the second gear support surface 815B. It is formed in a circular arc shape centered at. According to such a configuration, the gear support surfaces 815A and 815B and the contact surface 825B are formed in an arc shape that matches each other, and the gear support surfaces 815A and 815B are disposed on both sides of the support convex portion 815, respectively. Since the load is applied, the lock gear 820 can be stably supported.

As shown in FIG. 22, each lock gear 820 has a lift suppression convex portion 826 that protrudes to the left side on the left side surface of the lock-side pressed portion 824 (the other end portion in the circumferential direction of the internal gear 860). Yes. The floating suppression convex portion 826 is configured to contact the facing portion 861 of the internal gear 860. According to such a configuration, when the lifting restraining convex portion 826 contacts the facing portion 861, the lock gear 820 is lifted from the base portion 811 of the base plate 810, and is pressed against the internal teeth 862 A of the internal gear 860 particularly in the locked state. The lifting of the lower end portion of the lock gear 820 to be generated can be suppressed.

The lock gear 820 is formed by pressing a metal plate. As a result, the pivoted support portion 822A (the long hole portion 822) is formed such that the right side (one side in the left-right direction) of the lock gear 820 has a concave shape and the left side (the other side in the left-right direction) of the lock gear 820 has a convex shape. Has been. In the present embodiment, a pivoted support portion 822A that forms an uneven shape on the lock gear 820 and a release-side pressed portion 825 that is wider than the width of the portion where the pivoted support portion 822A is disposed are disposed close to each other. Therefore, the pivoted support portion 822A and the release side pressed portion 825 reinforce each other, and the rigidity of the lock gear 820 can be improved.

Further, since the lock gear 820 is formed by pressing a metal plate, the lock gear 820 has a convex portion on the back of the load transmitting portion 823. The convex portion on the back of the load transmitting portion 823 is formed at substantially the same height as the lifting suppression convex portion 826, and comes into contact with the facing portion 861 of the internal gear 860, so that the locking gear 820 and the lifting suppression convex portion 826 are in contact with each other. Suppresses lifting.

The slide cam 830 is a member that brings each lock gear 820 into a locked or released posture by pressing each lock gear 820 and is supported by the base plate 810 so as to be displaceable. More specifically, the slide cam 830 is disposed between the pair of guide portions 813 and is supported so as to be slidable in the vertical direction with respect to the base plate 810. The lock cam 830 presses the lock gears 820 toward the lock posture. (Position of FIG. 30) and a release position (position of FIG. 31) for pressing each lock gear 820 toward the release posture.

As shown in FIGS. 23 and 24, the slide cam 830 includes a plate-like cam main body portion 831, an engagement portion 833 protruding from the cam main body portion 831 to the right side (base plate 810 side), and a left side from the cam main body portion 831. It has a driving convex portion 834 projecting (on the opposite side to the base plate 810), a through hole 835 penetrating in the left-right direction, and a projecting edge portion 836.

The cam main body 831 is formed long in the vertical direction. More specifically, the cam main body portion 831 has a lower portion (extension portion 832) that extends downward from the rotation center C (one of the moving directions of the slide cam 830) when viewed from the left-right direction. The length in the vertical direction is longer than the length in the vertical direction of the upper portion that extends upward from the rotation center C. The cam body portion 831 includes a pair of release-side pressing portions 831A formed on the upper surface, a guided portion 831B guided by the slide cam guide surfaces 813A of the pair of guide portions 813, and a lower portion from the guided portion 831B. And a distal end portion 831C extending toward the end. The extending portion 832 is provided on the distal end portion 831C side, that is, on the first pressing surface 832A and the second pressing surface 832C described later.

The release-side pressing portion 831A is a portion that rotates each lock gear 820 to the release posture by pressing the pressed surface 825A of the corresponding lock gear 820, and is formed as a surface substantially parallel to the front-rear direction.

The guided portion 831B is a portion of the cam body portion 831 that has a substantially constant width in the front-rear direction, and a pair that contacts the second contacted surface 824C of the lock gear 820 on the outer side in the front-rear direction of the lower end portion. The second contact surface 832D.

The distal end portion 831C is formed in a shape in which the width in the front-rear direction is narrower than that of the guided portion 831B, specifically, a tapered shape in which the width in the front-rear direction decreases as it goes downward, and is sandwiched between the pair of guide portions 813. It is arranged outside the area (below the straight line L83). The tip portion 831C has a pair of first pressing surfaces 832A extending diagonally upward from the tip of the tip portion 831C and a pair of first contacts extending upward from the upper end of the first pressing surface 832A outward in the front-rear direction. The contact surface 832B has a pair of second pressing surfaces 832C that extend obliquely upward from the upper end of the first contact surface 832B and are connected to the second contact surface 832D. Each first contact surface 832B is formed in a shape in which the lower end portion extends substantially in the vertical direction, the vertical center portion is inclined obliquely upward outward in the front-rear direction, and the upper end portion extends substantially in the vertical direction. ing.

The engaging portion 833 is a convex portion that engages with the engaged portion 817 of the base plate 810, is elongated in the vertical direction, and is disposed from the lower end portion of the guided portion 831B to the distal end portion 831C. Here, since the engaging portion 833 is formed as a convex portion that engages with the concave engaged portion 817, the slide cam 830 has a highly rigid portion having an uneven shape near the engaging portion 833. It becomes. And since this highly rigid part (engagement part 833) is arrange | positioned from the lower end part of the to-be-guided part 831B to the front-end | tip part 831C, in this embodiment, the width | variety becomes shape narrower than the to-be-guided part 831B. Since the rigidity reduction of the tip 831C can be suppressed, the rigidity of the entire slide cam 830 can be improved.

The vertical length of the engaging portion 833 is shorter than the vertical length of the engaged portion 817. Therefore, the engaging portion 833 engaged with the engaged portion 817 can move in the vertical direction along the engaged portion 817. In other words, the engaging portion 833 and the engaged portion 817 are configured to guide the sliding movement of the slide cam 830 in the vertical direction. As a result, the slide cam 830 is guided to slide by both the pair of guide portions 813 and the engaged portion 817.

The drive convex portion 834 is a portion that engages with the operation member 840 to transmit the operation of the operation member 840 to the slide cam 830, and is formed in a substantially cylindrical shape. The driving convex portion 834 is disposed on the lower side (the extending portion 832 side) with respect to a straight line L85 extending in the front-rear direction through the rotation center C when viewed from the left-right direction. In addition, the driving convex portion 834 is disposed not in the tip portion 831C but in the guided portion 831B (wide portion) in the portion below the straight line L85 of the cam main body portion 831. Since the driving convex portion 834 receives a force from the operation member 840, the driving convex portion 834 is arranged in the guided portion 831B having a rigidity higher than that of the tip portion 831C having a narrow width, so that the rigidity of the driving cam 830 near the driving convex portion 834 is increased. Can be increased. Thereby, the operation of the slide cam 830 can be stabilized.

Further, the driving convex portion 834 is shifted to one side in the front-rear direction with respect to a straight line L81 extending in the up-down direction through the rotation center C (the center of the slide cam 830 in the front-rear direction) when viewed from the left-right direction, Is arranged on the front side of the straight line L81. In other words, the driving convex portion 834 is disposed on the front side of the straight line L81 so as to avoid a concave portion formed on the back of the engaging portion 833.

Further, the driving convex portion 834 is adjacent to the engaging portion 833 as a reinforcing portion that increases the rigidity of the slide cam 830 when viewed from the left and right directions, and on the circumference of the same circle with the rotation center C as the center. Has been placed. According to such a configuration, the driving convex portion 834 that receives the force from the operation member 840 can be disposed near the portion with high rigidity provided with the engaging portion 833, so that the vicinity of the driving convex portion 834 of the slide cam 830 can be arranged. The rigidity can be further increased, and the operation of the slide cam 830 can be further stabilized.

The through hole 835 is a hole through which the rotation shaft 891 (see FIG. 25) of the operation lever is inserted. The through hole 835 is formed in an oval shape that is long in the vertical direction and is disposed on the upper side of the engaging portion 833 to allow the slide cam 830 to slide in the vertical direction.

29, the protruding edge portion 836 is an annular convex portion that is an edge portion of the through hole 835 and slightly protrudes to the left side. The operation member 840 is disposed so as to slide on the protruding edge portion 836 when rotating. Thereby, the contact area between the slide cam 830 and the operation member 840 can be reduced, so that the sliding resistance between the slide cam 830 and the operation member 840 can be reduced. As a result, since the operation member 840 can be operated satisfactorily, an operation load for sliding the slide cam 830 can be reduced.

As shown in FIG. 22, the operation member 840 is a member that is rotatably supported with respect to the base plate 810 and is a member that moves the slide cam 830 to the lock position or the release position by rotating. On the left side, it is arranged to face the slide cam 830. The operation member 840 includes a supported portion 841 and a rotation restricting portion 842 constituting a plate-like main body portion, an engagement hole 843, a drive groove portion 844, and a pair of retaining holes 845. As shown, it is symmetrical about the straight line L81.

The supported portion 841 is a portion having a substantially oval shape when viewed from the left-right direction (the rotation axis direction of the operation member 840). Arranged between. When the slide cam 830 is in the locked position, the supported portion 841 is formed in an arc shape whose front and rear surfaces are centered on the rotation center C when viewed from the left-right direction. The operation member 840 is rotatable with respect to the base plate 810 by guiding the outer peripheral surface of the supported portion 841 along the operation member guide surface 813D.

The rotation restricting portion 842 is a portion having a substantially rectangular shape when viewed from the left-right direction extending downward from the supported portion 841 when the slide cam 830 is in the locked position. The operation member 840 is configured such that the amount of rotation of the operation member 840 is restricted when both end portions of the rotation restricting portion 842 in the rotation direction of the operation member 840 come into contact with the adjacent convex portion 813 C of the base plate 810.

The engagement hole 843 is a hole in which the rotation shaft 891 of the operation lever for operating the reclining mechanism 801 is engaged, and is disposed at the center of the supported portion 841 when viewed from the left-right direction. The engagement hole 843 is formed so as to have a substantially cross shape, and an edge portion of the engagement hole 843 is formed as an annular projecting portion projecting leftward from the supported portion 841 (see also FIG. 22). The operation member 840 is configured to rotate integrally with an operation lever operated by an occupant when the rotation shaft 891 is engaged with the engagement hole 843.

The drive groove portion 844 is a groove with which the drive convex portion 834 of the slide cam 830 is engaged, and is disposed in the rotation restricting portion 842. The drive groove portion 844 has a first groove portion 844A extending in the front-rear direction and a diameter of a rotation shaft 891 (the rotation shaft of the operation member 840) from both ends of the first groove portion 844A in the locked posture where the slide cam 830 is in the lock position. It has a pair of 2nd groove part 844B extended so that it may mutually spread toward the direction outer side. Although the operation of the reclining mechanism 801 will be described later, each of the second groove portions 844B guides the drive convex portion 834 and moves the slide cam 830 to the lock position or the release position when the operation member 840 rotates. It is configured. In the present embodiment, the driving convex portion 834 that engages with the driving groove portion 844 is positioned at the lower end portion of the second groove portion 844B on the front side in the locked posture.

The retaining hole 845 is a hole through which the end of the urging member 850 is inserted, and is disposed below the engagement hole 843 in the front-rear direction.

The biasing member 850 is a linear member that biases the slide cam 830 toward the lock position via the operation member 840, and includes a biasing member main body portion 851 and a first latching portion 852 formed at one end. And a second hooking portion 853 formed at the other end.

The first hooking portion 852 is biased from one end of the biasing member main body portion 851 toward the radially outer side of the circle centered on the rotation center C, and from the end of the first portion 852A. And a second portion 852B extending along the member main body portion 851. The first hooking portion 852 is hooked on a base side rotation restricting convex portion 813B formed on the front guide portion 813. More specifically, in the first hooking portion 852, the first portion 852A is disposed between the base-side rotation restricting convex portion 813B and the adjacent convex portion 813C, and the second portion 852B is the base-side rotation restricting convex portion. By being hooked on 813B, the base side rotation restricting convex portion 813B is sandwiched between the second portion 852B and one end portion of the biasing member main body portion 851. Furthermore, one end of the urging member 850 has a substantially U shape along one side of the urging member main body 851, the second portion 852B, and the first portion 852A along the side surface of the base side rotation restricting convex portion 813B. It is formed and latched so as to be wound around the base side rotation restricting convex portion 813B.

As shown in FIG. 31, the first hooking portion 852 is disposed at a position where it does not come into contact with the lock gear 820 even when the front lock gear 820 is rotated to the release posture. Specifically, the first hooking portion 852 is disposed inside the wheel ring of the front guide portion 813 when viewed from the left-right direction. Thereby, interference with the 1st latching | locking part 852 and the front side lock gear 820 rotated to the cancellation | release attitude | position can be suppressed.

30, the second hooking portion 853 is formed so as to extend from the other end of the biasing member main body portion 851 toward the base portion 811 side. The biasing member 850 is configured such that the first latching portion 852 is hooked on the front base side rotation restricting convex portion 813B, and the biasing member main body portion 851 is disposed on the front base side rotation restricting convex portion 813B. The second latching portion 853 is disposed in the latching hole 845 on the front side of the operation member 840 and is disposed along the operation member guide surface 813D of the base-side rotation regulating convex portion 813B on the side and the adjacent convex portion 813C on the rear side. It is arranged by being hooked.

As shown in FIG. 22, the ring 870 is a member for rotatably holding the internal gear 860 on the base plate 810. The ring 870 is radially inward from the annular ring main body 871 and the left end of the ring main body 871. And a holding portion 872 extending to the center. As shown in FIG. 29, the ring 870 is fixed to the base plate 810 by welding the right end portion of the ring main body portion 871 and the base plate 810, and the holding portion 872 is the outer peripheral portion (internal tooth forming portion) of the internal gear 860. 862). Thus, the internal gear 860 is rotatably held by the base plate 810, and the lock gear 820, the slide cam 830, the operation member 840, and the biasing member 850 are held between the base plate 810 and the internal gear 860. .

Next, the operation of the reclining mechanism 801 configured as described above will be described.
As shown in FIG. 30, in the state where each lock gear 820 is in the locked position (locked state), when the occupant operates the operation lever in the release direction against the urging force of the urging member 850, the operation member 840 is shown in the figure. Rotate around. Then, the driving convex portion 834 of the slide cam 830 is pressed by the lower surface of the front second groove portion 844B, and is pushed up along the lower surface of the front second groove portion 844B. The slide cam 830 slides from the lock position toward the upper release position.

Then, as shown in FIG. 31, when the release side pressing portion 831A of the slide cam 830 contacts the pressed surface 825A of each lock gear 820 and presses the pressed surface 825A, the release side pressed portion 825 is pushed up, Each lock gear 820 rotates from the lock posture to the release posture around the shaft support portion 814. When the slide cam 830 reaches the release position, the lock gears 820 are in the release posture, and the gear teeth 821 are completely disengaged from the internal teeth 862A of the internal gear 860. As a result, the internal gear 860 is allowed to rotate with respect to the base plate 810, and thus the tilt of the seat back S2 with respect to the seat cushion S1 is allowed. As shown in FIGS. 25A and 25B, the internal gear 860 rotates when the gear-side rotation restricting convex portion 863 contacts the base-side rotation restricting convex portion 813B of the base plate 810. The amount of movement is regulated. Thereby, the amount of tilting of the seat back S2 is regulated.

As shown in FIG. 31, when the slide cam 830 reaches the release position, the drive convex portion 834 is positioned at the upper end portion of the front-side second groove portion 844B. From this state, when the operation member 840 is further rotated clockwise by the operation of the occupant, the first groove portion 844A is engaged with the drive convex portion 834, but the first groove portion 844A is in the front-rear direction. Due to the extending groove, the drive protrusion 834 is not pushed up any further. Thereby, it can suppress that an excessive load is applied to the slide cam 830 and each lock gear 820. Note that the rotation amount of the operation member 840 is restricted when the rotation restricting portion 842 contacts the adjacent convex portion 813 C of the base plate 810.

In a state where each lock gear 820 is in a release posture (release state), when the occupant releases his / her hand from the operation lever, the operation member 840 is rotated counterclockwise by the urging force of the urging member 850. Then, the drive convex portion 834 of the slide cam 830 is pressed by the upper surface of the second groove portion 844B on the front side, and is pushed down along the upper surface of the second groove portion 844B on the front side. The cam 830 slides from the release position toward the lower lock position.

When the pair of second pressing surfaces 832C of the slide cam 830 abut against the second inclined surfaces 824D of the lock gears 820 and press the second inclined surfaces 824D, the lock-side pressed portions 824 are pressed down, and the lock gears 820 are pressed. Rotates around the shaft support 814 from the release position to the lock position. Thereafter, as shown in FIG. 30, the second pressing surface 832C is detached from the second inclined surface 824D, and the pair of second contact surfaces 832D of the slide cam 830 is between the second contacted surfaces 824C of the lock gears 820. When entering, each lock gear 820 assumes a substantially locked posture, and the gear teeth 821 mesh with the internal teeth 862A of the internal gear 860.

Further, when the pair of first contact surfaces 832B of the slide cam 830 enters between the first contact surfaces 824A of the lock gears 820, and the slide cam 830 slides toward the lock position, the first contact surfaces 832B. Is inclined toward the upper side in the front-rear direction and the lock-side pressed portion 824 of each lock gear 820 is spread and the lock cam 830 is locked when the slide cam 830 reaches the release position. Held in posture. As a result, the rotation of the internal gear 860 relative to the base plate 810 is restricted, so that the tilt of the seat back S2 relative to the seat cushion S1 is restricted.

If a force is applied to the seat back S2 when the reclining mechanism 801 is in a locked state, a load in the rotational direction acts on the internal gear 860, and each lock gear 820 that meshes with the internal teeth 862A of the internal gear 860 is also applied. A load in the rotational direction acts on the internal gear 860. For example, when a load acts in the clockwise direction in the figure, in the front lock gear 820, the load transmitting portion 823 to the load receiving portion 816, and the contact surface 825B to the first gear support surface 815A of the support convex portion 815. Each load will be applied. Further, in the rear side lock gear 820, from the supported shaft support portion 822A to the support shaft portion 814, from the load transmitting portion 823 to the load receiving portion 816, from the second contacted surface 824C to the second contact surface 832D, and Thus, a load is applied from the first contacted surface 824A to the first contact surface 832B. Furthermore, in the slide cam 830 to which a load is applied from the rear lock gear 820, a load is applied from the engaging portion 833 to the engaged portion 817.

In this embodiment, since the load transmission part 823 is provided in the lock gear 820 and the load receiving part 816 is provided in the base plate 810, the load can be dispersed, and the shaft support part 814, the shaft support part 822A, and the support convex part. The load applied to 815 can be reduced. In particular, in the present embodiment, since the load transmitting portion 823 and the load receiving portion 816 are disposed inside the ring of the lock gear 820 as viewed from the left-right direction, the load transmitting portion and the like are provided so as to protrude from the ring. As compared with the above, the load applied to the shaft support portion 814, the shaft support portion 822A, and the support convex portion 815 can be reduced with a compact configuration.

Further, since each load gear 820 is provided with a plurality of load transmission portions 823, the load can be further dispersed, and the load applied to the shaft support portion 814, the shaft support portion 822A, and the support convex portion 815 can be further reduced. it can. Further, the second load transmission portion 823B is disposed on the opposite side of the pivoted portion 822A with the first load transmission portion 823A sandwiched in the circumferential direction of the internal gear 860 (see also FIG. 23). Compared with the configuration in which the portion 823 is provided side by side in the short direction of the long lock gear 820, the size of the portion receiving the load, such as each load transmission portion 823, can be secured, so that the shaft support portion 814 and the shaft support portion The load applied to 822A and the support convex portion 815 can be further reduced.

According to the reclining mechanism 801 of the present embodiment described above, the slide cam 830 is sandwiched between the pair of guide portions 813, and the concave engaged portion 817 in which the convex engaging portion 833 is formed on the base plate 810. , The position of the slide cam 830 can be accurately determined. In addition, since the movement of the slide cam 830 is guided by both the pair of guide portions 813 and the engaged portion 817, the movement of the slide cam 830 can be stabilized.

In particular, in the present embodiment, the lower portion of the engaged portion 817 is disposed outside the region sandwiched between the pair of guide portions 813, so that the region of the slide cam 830 sandwiched between the guide portions 813 The movement of the portion on the outside can be guided by the engaged portion 817. Thereby, the movement of the slide cam 830 can be stabilized even outside the area sandwiched between the pair of guide portions 813.

In the present embodiment, the engaged portion 817 is a concave portion and the engaging portion 833 is a convex portion, so that the position of the slide cam 830 can be accurately determined with a relatively simple configuration, and the slide The movement of the cam 830 can be stabilized.

In the present embodiment, since the concave engaged portion 817 is connected to the welding recess 819D, the slide cam 830 has a portion where the engaged portion 817 and the welding recess 819D are connected as a part of the engaged portion 817. It is possible to use it for guidance of movement. Thereby, the movement amount of the slide cam 830 can be ensured. Further, since the engaged portion 817 and the weld recess 819D are connected, the rigidity of the base plate 810 can be improved.

Further, since the shaft support portion 814 of the base plate 810 and the supported shaft support portion 822A of the lock gear 820 are disposed inside the wheel ring of the lock gear 820 when viewed from the left-right direction, the shaft support portion is disposed around the lock gear (outside the wheel ring). Compared to a simple configuration, the reclining mechanism 801 can be prevented from increasing in size in the radial direction.

Further, in the present embodiment, the shaft support portion 814 is a convex portion that protrudes toward the lock gear 820 and the shaft support portion 822A is a concave portion, so that the shaft support portion 814 is a base plate (not shown) of the cushion side frame F1 (see FIG. 1). The influence on the fixed surface can be suppressed. Supplementally, when the shaft support portion of the base plate is a concave portion, for example, when the base plate is formed by pressing a metal plate, a convex portion may be formed on the back of the concave shaft support portion. If it does so, it will be necessary to form the recessed part etc. for receiving the said convex part in the baseplate fixed surface of cushion side frame F1, and it may affect the shape of a baseplate fixed surface. On the other hand, in the present embodiment, since the shaft support portion 814 is a convex portion, no convex portion is formed on the back of the shaft support portion 814, so that the influence on the base plate fixing surface of the cushion side frame F1 can be suppressed.

Moreover, since the guide part 813 which guides the movement of the slide cam 830 is used as a part which latches one end (1st latching part 852) of the biasing member 850, in order to latch the biasing member 850. The configuration of the system does not become complicated. Further, since one end of the urging member 850 is hooked on the guide portion 813 having high rigidity protruding from the base portion 811 of the base plate 810, the urging member 850 can be hooked stably.

In particular, in the present embodiment, since the protruding guide portion 813 is further provided with a convex portion (base-side rotation restricting convex portion 813B), the rigidity of the guide portion 813 can be further increased and the rigidity is further increased. Since one end of the urging member 850 is hooked to the base side rotation restricting convex portion 813B which is a part of the guide portion 813, the urging member 850 can be hooked more stably.

In the present embodiment, one end of the urging member 850 passes between the base side rotation restricting convex portion 813B and the adjacent convex portion 813C and is hooked on the base side rotation restricting convex portion 813B. It is possible to suppress the movement of the biasing member 850 in the direction in which the convex portions are arranged, or to prevent one end of the biasing member 850 from interfering with a member disposed in the vicinity thereof. Thereby, the biasing member 850 can be more stably latched.

Further, in the present embodiment, one end of the biasing member 850 is disposed between the two

convex portions

813B and 813C and is hooked so as to be wound around the base side rotation restricting convex portion 813B. The biasing member 850 can be latched more stably. Further, by forming one end of the urging member 850 in a shape along the base-side rotation restricting convex portion 813B in advance, the assembling property of the urging member 850 can be improved, or the urging member after assembling. The mounting rigidity of 850 can be improved.

Further, as shown in FIG. 23, the drive convex portion 834 of the slide cam 830 is disposed on the lower portion (the extended portion 832 side) of the cam main body portion 831 that extends long from the rotation center C. The drive convex portion 834 can be disposed away from the rotation center C. Thereby, the operation load for moving the slide cam 830 can be reduced. Further, by arranging the driving convex portion 834 in the lower portion that is longer than the upper portion of the cam main body portion 831 with respect to the rotation center C, for example, the upper portion of the cam main body portion is formed longer and the driving convex portion is formed. Compared to the configuration in which the portion is arranged, the overall size of the slide cam 830 can be suppressed. Thereby, the enlargement of the reclining mechanism 801 can be suppressed.

In addition, a first gear support surface 815A that receives a load from the first lock gear 820A and a second gear support surface 815B that receives a load from the second lock gear 820B are provided on one support convex portion 815 of the base plate 810. Therefore, the number of support protrusions can be reduced compared to a configuration in which one support protrusion is provided for each lock gear. Thereby, since enlargement of the base plate 810 can be suppressed, enlargement of the reclining mechanism 801 can be suppressed.

In this embodiment, since the support convex portion 815 is formed in a shape in which the width of the central portion in the vertical direction is smaller than the width of both end portions, the gear support surfaces 815A and 815B are provided on both sides of the support convex portion 815. The gear support surfaces 815A and 815B can be formed as a continuous surface in which the central portion is recessed from both ends, respectively. Accordingly, the lock gear 820 can be stably supported by the gear support surfaces 815A and 815B.

As mentioned above, this invention is not limited to each embodiment mentioned above, As shown in the other form of the following, it can change suitably and can implement. In the following embodiments, the same reference numerals are given to components that are substantially the same as those in the above-described embodiment, and the description thereof is omitted.

In the first embodiment, the two

regulated surfaces

22c and 22d are provided. However, the present invention is not limited to this, and the regulated surface is provided only on one of the first outer peripheral surface and the second outer peripheral surface. Also good. In this case, only one restriction surface need be provided.

In the second embodiment, the slide cam 300 is configured to press the lock gear 200 in both the locked position and the released position. However, the present invention is not limited to this, and for example, as shown in FIGS. In addition, the slide cam 300 may be configured to press the lock gear 200 only in the locked position, or as illustrated in FIGS. 13 and 14, the slide cam 300 may be configured to press the lock gear 200 only in the release position. May be.

Specifically, in the form of FIGS. 11 and 12, the slide cam 300 has a shape in which the connecting portion 320 and the release-side pressing portion 330 described above are removed. Instead, a tension coil spring 600 is provided at the tip of each lock gear 200 to urge each lock gear 200 toward the release posture. Further, the second extending portion 220 of each lock gear 200 is formed to be wider than that of the above-described embodiment in order to attach the tension coil spring 600.

In the locked state, the urging force of each spring SP2, 600 is set so that the force applied from the slide cam 300 toward each lock gear 200 is larger than the force applied from each lock gear 200 toward the slide cam 300. ing.

In this form, when each lock gear 200 is in the locked position shown in FIG. 11, when the occupant operates the operation lever in the release direction, the rotation shaft 400 rotates clockwise in the drawing, so that the rotation shaft 400 The engagement groove 410 pushes down the engagement groove hole 315 of the slide cam 300, and the slide cam 300 moves downward from the lock position against the urging force of the compression coil spring SP2. By the downward movement of the slide cam 300, the distal end portions of the lock gears 200 supported by the slide cam 300 are rotated in the directions approaching each other by the tension coil spring 600, so that the lock gears 200 are released from the release posture shown in FIG. It becomes.

In the state where each lock gear 200 is in the release posture, when the occupant releases his / her hand from the operation lever, the slide cam 300 moves upward by the urging force of the compression coil spring SP2. The slide cam 300 that moves upward pushes the tip of each lock gear 200 upward in the same manner as in the above-described embodiment, so that each lock gear 200 is moved from the release posture to the lock posture against the urging force of the tension coil spring 600. Rotate.

In the form of FIGS. 13 and 14, the slide cam 300 is configured such that the contact surfaces 312 and the lock-side pressing surfaces 313 described above are removed. Specifically, the slide cam 300 is configured not to contact the lock gears 200 in the locked state. ing. Instead, a compression coil spring 601 is provided between each guide portion 120 and each lock gear 200 to urge each lock gear 200 toward the lock posture. In addition, each guide portion 120 is provided with an installation recess 121 for installing the compression coil spring 601. Further, the base plate 100 is provided with a restriction portion (not shown) for restricting the slide cam 300 at the release position.

In this form, when the occupant operates the operation lever in the release direction in a state where each lock gear 200 is in the locked posture shown in FIG. The engagement groove 410 pushes down the engagement groove hole 315 of the slide cam 300, and the slide cam 300 moves downward from the lock position against the urging force of the compression coil spring SP2. Thereafter, as shown in FIG. 14, the release-side pressing portion 330 of the slide cam 300 that moves downward presses the distal end portion of each lock gear 200, so that each lock gear 200 receives the urging force of each compression coil spring 601. Accordingly, when the slide cam 300 reaches the release position, the lock gear 200 is set to the release position when the slide cam 300 reaches the release position.

In addition, when the occupant releases the hand from the operation lever in a state where each lock gear 200 is in the release posture, the slide cam 300 is moved from the release position to the lock position by the urging force of the compression coil spring SP2, and the compression coil springs 601 are moved. Due to the urging force, each lock gear 200 rotates from the release posture toward the lock posture.

In the second embodiment, the concave portion 140 has an arc shape, but the present invention is not limited to this, and any shape that includes the movement locus (arc-like locus) of the protrusion formed on the internal gear can be used. Any shape is acceptable.

In the second embodiment, both the lock-side pressed portion (lock-side pressed surface 222) and the release-side pressed portion (release-side pressed surface 224) are provided on one end side in the longitudinal direction of the lock gear. For example, the lock-side pressed portion may be provided on one end side in the longitudinal direction of the lock gear, and the release-side pressed portion may be provided on the other end side. In other words, the lock gear may be configured to rotate in the lock direction / release direction by bringing one end and the other end in the moving direction of the slide cam into contact with one end and the other end in the longitudinal direction of the lock gear. However, in this structure, it is necessary to make the height of the coupling portion low so that a part of the slide cam protrudes to the lock gear side from the coupling portion, but in the above embodiment, each pressed member provided on one end side of the lock gear Since it is only necessary to provide a portion acting on the portion only on one end side of the slide cam, it is not necessary to reduce the height of the coupling portion, and the rigidity of the coupling portion can be increased.

In the second embodiment, the vertical position (distance from the rotation axis of the lock gear 200) of each gear tooth 211 of each lock gear 200 is the same, but the present invention is not limited to this, and is shown in FIG. In this way, for example, the gear teeth 212 of the rear lock gear 200 may be shifted from the gear teeth 211 of the front lock gear 200 (in a direction away from the rotation axis). According to this, when the slide cam 300 is moved from the release position toward the lock position, the lock gears 200 are engaged with the internal gear 500 at different timings. Compared to the structure in which the internal gear 500 is simultaneously meshed, the two lock gears 200 can be easily meshed with the internal gear 500.

In the second embodiment, the shape of each guide part 120 is a line-symmetric shape, but the present invention is not limited to this, and the shape of each guide part 120 may be formed in a shape that is not line-symmetric. .

In each of the above embodiments, the base plate is fixed to the seat cushion and the internal gear is fixed to the seat back. However, the present invention is not limited to this, and the base plate is fixed to the seat back and the internal gear is fixed to the seat cushion. May be.

In each of the embodiments described above, two lock gears are provided. However, the present invention is not limited to this. For example, the number of lock gears may be one, or may be three or more.

In each of the above embodiments, the spiral spring SP and the compression coil spring are exemplified as the first biasing member. However, the present invention is not limited to this, and the first biasing member may be, for example, a torsion spring or a leaf spring. Good.

In the third embodiment, the first abutting

surfaces

31A and 31B have different inclinations, that is, the first pressing portion and the second pressing portion provided on the slide cam have different shapes, thereby moving the slide cam in the moving direction. Although the distance from the first pressing portion to the first lock gear and the distance from the second pressing portion to the second lock gear are different, the present invention is not limited to this. For example, the first pressing portion and the second pressing portion are formed in the same shape, and the shape of the contact portion with each pressing portion in the first lock gear and the second lock gear is made different so that the slide cam moves in the moving direction. You may comprise so that the distance from a 1st press part to a 1st lock gear may differ from the distance from a 2nd press part to a 2nd lock gear.

In the fourth embodiment, the plate spring SP3 is exemplified as the second urging member. However, the present invention is not limited to this, and the second urging member is, for example, a torsion spring, a wire spring, a compression coil spring, or the like. Also good.

In the fifth embodiment, the compression coil spring SP4 is exemplified as the third biasing member. However, the present invention is not limited to this, and the third biasing member is, for example, a torsion spring, a wire spring, a leaf spring, or the like. Also good.

In the first to fifth embodiments, the arcuate bulging portion 17 is exemplified as the sliding resistance reducing portion. However, the present invention is not limited to this, and for example, to make the surface of the base plate facing the lock gear easy to slide. The coating agent applied to the surface may be used as the sliding resistance reducing unit.

In the first and third to fifth embodiments, the rotation shaft portion 21 is formed integrally with the lock gear 20, but the present invention is not limited to this, and the rotation shaft portion is separate from the lock gear. It may be configured.

In the sixth embodiment, for example, as shown in FIG. 32, the base plate 810 may have inclined surfaces 811 C formed at corners formed by the base portion 811 and the guide portion 813. More specifically, the inclined surface 811 C is formed as a surface that is inclined so as to approach the guide portion 813 that faces the guide portion 813 that forms a corner with the base portion 811 as it approaches the base portion 811. In other words, the inclined surface 811C is formed as a surface that is inclined so as to be closer to the inner side in the front-rear direction as it approaches the base 811 side. Further, the corner portion 837 facing the inclined surface 811C of the slide cam 830 is preferably chamfered, and more preferably chamfered in an R shape. According to such a configuration, the slide cam 830 can be brought close to the guide portion 813 on the opposite side of the inclined surface 811C, the operation member 840, and the like by the inclined surface 811C, so that rattling of the slide cam 830 is suppressed. be able to. The base plate may have a configuration in which an inclined surface is formed only at a corner portion between the base portion and one guide portion, and an inclined surface is not formed at a corner portion between the base portion and the other guide portion. .

In the sixth embodiment, the pivotally supported portion 822A is a concave portion formed in an arc shape when viewed from the left-right direction, but is not limited thereto. For example, as shown in FIG. 33, the pivotally supported portion 922 may be a concave portion formed in a circular shape when viewed from the left-right direction (the rotational axis direction of the internal gear 860). According to such a configuration, the concave supported shaft portion 922 is circular, so that the entire circumference of the inner peripheral surface of the supported shaft support portion 922 and the entire periphery of the side surface of the convex supported shaft portion 814 can slide. Therefore, the support area of the shaft support portion 814 and the supported shaft support portion 922 can be further ensured. Thereby, rotation of the lock gear 820 can be stabilized.

In the sixth embodiment, the engaging portion 833 is disposed from the guided portion 831B to the distal end portion 831C. However, the present invention is not limited to this. For example, the engaging portion is either the guided portion or the distal end portion. The structure arrange | positioned at one side may be sufficient.

In the sixth embodiment, the engaged portion 817 has its upper end disposed inside the region sandwiched between the pair of guide portions 813, and the portion below the upper end is sandwiched between the pair of guide portions 813. Although arranged outside the region, the present invention is not limited to this. For example, the entire engaged portion may be disposed outside the region sandwiched between the guide portions, or may be disposed entirely inside the region sandwiched between the guide portions.

In the sixth embodiment, the engaged portion 817 of the base plate 810 is a concave portion and the engaging portion 833 of the slide cam 830 is a convex portion. However, the present invention is not limited to this. For example, the engaged portion is convex. And the engaging portion may be a recess.

In the sixth embodiment, the shaft support portion 814 of the base plate 810 is a convex portion, and the shaft supported portion 822A of the lock gear 820 is a concave portion. However, the present invention is not limited to this, for example, the shaft support portion is a concave portion. The support part may be a convex part.

In the sixth embodiment, one end (first latching portion 852) of the urging member 850 is latched by the base side rotation restricting convex portion 813B, but the present invention is not limited to this. For example, one end of the urging member may be hooked on an adjacent convex portion, or may be hooked on a guide portion (a main body portion of the guide portion excluding the base side rotation restricting convex portion or the adjacent convex portion). Also good.

The configuration of the urging member 850 shown in the sixth embodiment is an example, and is not limited to the configuration described above. For example, the urging member may be a spiral spring, a coil spring, a leaf spring, or the like.

In the sixth embodiment, one guide portion 813 is provided on each of the front side and the rear side of the slide cam 830. However, the guide portion 813 is not limited to this. For example, the guide portion is provided on each of the front side and the rear side of the slide cam. A plurality of them may be provided.

In the sixth embodiment, the engaging portion 833 that protrudes toward the base plate 810 is illustrated as the reinforcing portion provided in the slide cam 830. However, the present invention is not limited to this, and for example, the reinforcing portion is the engaging portion. It may be a protrusion provided separately. In this case, the reinforcing part may be provided so as to protrude to the side opposite to the base plate side.

In the sixth embodiment, the drive convex portion 834 is disposed not in the tip end portion 831C but in the guided portion 831B (wide portion) in the portion below the straight line L85 of the cam main body portion 831. For example, the driving convex portion may be arranged at the tip portion.

In the sixth embodiment, the reclining mechanism 801 is provided on the right side of the seat cushion S1, but the present invention is not limited to this. For example, the reclining mechanism may be provided on the left side of the seat cushion, or both left and right sides. May be provided.

When the reclining mechanism 801 of the sixth embodiment is provided on the left side of the seat cushion S1, at least the slide cam and the biasing member are configured to be bilaterally symmetrical with the slide cam 830 and the biasing member 850 of the sixth embodiment. The Rukoto. On the other hand, as shown in FIG. 23, the base plate 810 has a pair of guide portions 813, engaged portions 817 and the like provided symmetrically with respect to the straight line L81 when viewed from the left-right direction. It can be configured as a part. In addition, since the first lock gear 820A and the second lock gear 820B are formed symmetrically with respect to the straight line L81, they can be configured as left and right common parts.

Further, the driving convex portion 834 of the slide cam 830 is disposed at a position shifted to one side in the front-rear direction with respect to the straight line L81 when viewed from the left-right direction, and the driving groove portion 844 of the operation member 840 is the first groove portion in the locked posture. 844A and a pair of second groove portions 844B extending from both end portions of the first groove portion 844A, and each second groove portion 844B guides the driving convex portion 834 by the rotation of the operation member 840 and locks the slide cam 830. Or since it is comprised so that it may move to a cancellation | release position, the operation member 840 can be comprised as a right-and-left common component. Supplementally, in the operation member 840 in the state shown in FIG. 30, the second groove 844B on the front side guides the drive convex portion 834 of the slide cam 830 when the reclining mechanism 801 is provided on the right side of the seat cushion S1. The rear second groove portion 844B is used to guide the drive convex portion of the slide cam that is symmetrical to the slide cam 830 when the reclining mechanism 801 is provided on the left side of the seat cushion S1. It is done.

Thus, since the base plate 810, the lock gear 820, and the operation member 840 can be configured as the left and right common parts, the number of parts of the reclining mechanism 801 (vehicle seat S) can be reduced. Thereby, for example, the cost can be reduced, or misassembly of the base plate 810, the operation member 840, and the like can be suppressed by using the left and right common parts.

The configuration of the operation member 840 (operation member) shown in the sixth embodiment is an example, and is not limited to the above configuration. For example, in the sixth embodiment, the drive groove portion 844 has a configuration including the first groove portion 844A and a pair of second groove portions 844B provided at both ends of the first groove portion 844A, but is not limited thereto. Instead, the second groove may be provided only at one end of the first groove.

In the sixth embodiment, the reclining mechanism 801 has a configuration in which the base plate 810 is fixed to the seat cushion S1 and the internal gear 860 is fixed to the seat back S2, but the invention is not limited thereto. For example, the reclining mechanism may be configured such that the base plate is fixed to the seat back and the internal gear is fixed to the seat cushion. In this configuration, when the base plate has a positioning projection, the positioning projection serves as a portion for determining the position of the base plate with respect to the seat back. In addition, when the base plate has a welding projection, the welding projection becomes a portion for fixing the base plate to the seat back by welding.

In each of the above embodiments, the reclining mechanism is applied to the vehicle seat S provided on the vehicle. However, the present invention is not limited to this, and the reclining mechanism is other than a vehicle such as an office chair or a massage chair. You may apply to the sheet | seat provided in.

In each of the above embodiments, the lock gear 20 is configured to be rotatable. However, the present invention is not limited to this, and for example, the lock gear may be configured to be linearly movable. However, compared to the structure in which the lock gear is linearly moved in this manner, in the structure in which the lock gear 20 is rotated as in the above-described embodiments, the gear teeth 24a of the lock gear 20 are changed from the rotation shaft side to the internal gear 50 in order. Since it can mesh, the lock gear 20 can mesh with the internal gear 50 satisfactorily.

In each of the above embodiments, a slot is exemplified as the groove-shaped portion, but the present invention is not limited to this, and may be a groove with a bottom, for example.

In each of the above embodiments, the cams (slide cams 30 and 830) are configured to be movable along a straight line. However, the present invention is not limited to this, and for example, a curve that slightly curves the cam (slide cam). It may be configured to be movable along a predetermined line.

Claims

A reclining mechanism for adjusting the inclination angle of the seat back with respect to the seat cushion,
A base plate fixed to one of the seat cushion and the seat back;
An internal gear fixed to the other of the seat cushion and the seat back and rotatable with respect to the base plate;
A lock gear rotatably supported by the base plate so as to be rotatable between a lock posture that meshes with the internal gear and a release posture that is disengaged from the internal gear;
A slide cam that is supported by the base plate so as to be movable along a predetermined line, and that presses the lock gear to bring the lock gear into the lock posture or the release posture;
An operation member for operating the slide cam, and a reclining mechanism.
The base plate is disposed so as to be opposed to the slide cam in the axial direction of the internal gear, and to sandwich the slide cam in a direction that protrudes from the slide surface and is orthogonal to the moving direction of the slide cam. A pair of guide portions for guiding the slide cam;
The internal gear has a facing portion that faces the base plate in the axial direction, and a protruding portion that protrudes from the facing portion toward the base plate.
The reclining mechanism according to claim 1, wherein each guide portion is provided with a rotation restricting portion that restricts a rotation amount of the internal gear by restricting movement of the protruding portion.
The reclining mechanism according to claim 1 or 2, wherein the slide cam is configured to press the lock gear at an end portion in a moving direction.
The lock gear is formed in an elongated shape, one end portion facing the moving direction of the slide cam in the moving direction, and the other end facing the other end portion of the sliding cam in the moving direction. And
The slide cam presses the one end portion of the lock gear to press the lock gear toward the lock posture, and presses the other end portion of the lock gear to release the lock gear to the release posture. The reclining mechanism according to claim 3, wherein the reclining mechanism is configured to be movable to a second position that presses toward the second position.
The lock gears are provided one by one across the slide cam in an orthogonal direction orthogonal to the moving direction of the slide cam,
The one end portion of the slide cam is provided with a pair of contact surfaces that contact each end portion of each lock gear,
5. The reclining mechanism according to claim 4, wherein the pair of contact surfaces are inclined toward each other as they go from the other end side to the one end side.
The contact surface is
A first contact surface that contacts the lock gear before the slide cam reaches the first position from the second position; and an outer side in the orthogonal direction than the first contact surface; A second contact surface that contacts the lock gear when the slide cam is located at the first position;
The reclining mechanism according to claim 5, wherein the second contact surface is curved so as to be recessed toward the inside of the slide cam.
The one end side of the slide cam is located on the other end side with respect to the contact surface, and when the lock gear is in the lock posture, the one end portion of the lock gear is in the orthogonal direction. A pair of opposing surfaces are provided,
The reclining mechanism according to claim 5, wherein, in the locking posture, the facing surface is disposed in a non-contact state with the lock gear.
The base plate is disposed so as to sandwich the slide cam in a direction perpendicular to the moving direction of the slide cam, and a base portion facing the slide cam in the rotation axis direction of the internal gear, A plurality of guide portions for guiding the movement of the slide cam; and an engaged portion provided in the base portion;
The slide cam has an engaging portion that engages with the engaged portion,
The reclining mechanism according to claim 1, wherein the engaged portion and the engaging portion are configured to guide the movement of the slide cam.
The reclining mechanism according to claim 8, wherein at least a part of the engaged portion is disposed outside a region sandwiched between the plurality of guide portions.
The engaged portion is a recess extending in the moving direction,
The engaging portion is a convex portion,
The base plate has a welding projection protruding from the base to the side opposite to the slide cam side in order to fix the base plate to one of the seat cushion and the seat back by welding,
The weld convex portion forms a concave concave portion on the surface of the slide cam side of the base portion,
The reclining mechanism according to claim 8 or 9, wherein the engaged portion is connected to the weld recess.
The base plate has a base portion that faces the slide cam in the rotation axis direction of the internal gear, and a shaft support portion that is provided on the base portion and rotatably supports the lock gear,
The lock gear has a supported shaft portion that engages with the shaft support portion,
2. The reclining mechanism according to claim 1, wherein the shaft support portion and the shaft support portion are arranged inside a ring of the lock gear when viewed from the rotation axis direction.
The pivoted support portion is formed such that one side in the rotational axis direction is concave and the other side in the rotational axis direction is convex.
The lock gear has a long shape extending along the circumferential direction of the internal gear, the pivot support is disposed at one end in the circumferential direction, and the circumference of the lock gear is larger than the portion where the pivot support is disposed. It has a pressed part that is pressed by the cam at the tip part on one end side in the direction,
The reclining mechanism according to claim 11, wherein the pressed portion is formed to have a width greater than a width of a portion where the pivot support portion is disposed.
The lock gear includes a load transmitting portion that engages with the base plate and receives a load in a rotation direction of the internal gear, inside the ring of the lock gear when viewed from the rotation axis direction. Item 13. A reclining mechanism according to item 11 or claim 12.
The lock gear has an elongated shape extending along the circumferential direction of the internal gear, and the pivot support is disposed at one end of the circumferential direction.
The load transmission unit includes a first load transmission unit and a second load transmission unit,
The reclining mechanism according to claim 13, wherein the second load transmission portion is disposed on the opposite side of the pivoted support portion with the first load transmission portion interposed therebetween in the circumferential direction.
The lock gear is provided with a rotation shaft portion that overlaps with the rotation axis when viewed from the direction of the rotation axis of the lock gear,
The reclining mechanism according to claim 1, wherein a bearing surface that rotatably supports an outer peripheral surface of the rotation shaft portion is formed on the base plate.
The base plate has a base portion that faces the lock gears in a rotation axis direction of the internal gear, and a support convex portion that protrudes from the base portion to the lock gear side,
A plurality of the lock gears are provided, and include a first lock gear and a second lock gear,
The support convex portion is in contact with a side surface of the first lock gear as viewed from the rotation axis direction and configured to contact a side surface of the wheel so as to receive a load in the rotation direction of the internal gear, and the second gear support surface. 2. The second gear support surface according to claim 1, further comprising a second gear support surface that is in contact with a side surface of the lock gear viewed from the rotation axis direction and receives a load in the rotation direction of the internal gear. Reclining mechanism.
The first gear support surface and the first contact surface that contacts the first gear support surface of the first lock gear are circles centered on the rotation center of the first lock gear when viewed from the rotation axis direction. Formed in an arc,
The second gear support surface and the second contact surface that contacts the second gear support surface of the second lock gear are circles centered on the rotation center of the second lock gear when viewed from the rotation axis direction. Formed in an arc,
The first gear support surface is disposed on one side of the support convex portion in the rotation direction of the internal gear,
The reclining mechanism according to claim 16, wherein the second gear support surface is disposed on the other side of the support convex portion in the rotation direction of the internal gear.
A biasing member for biasing the slide cam;
The base plate is disposed so as to sandwich the slide cam in a direction perpendicular to the moving direction of the slide cam, and a base portion facing the slide cam in the rotation axis direction of the internal gear, A plurality of guide portions for guiding the movement of the slide cam;
The reclining mechanism according to claim 1, wherein one end of the urging member is hooked on the guide portion.
The internal gear includes a facing portion that faces the base in the rotation axis direction, and a gear-side rotation restricting convex portion that protrudes from the facing portion toward the base plate.
Each of the guide portions has a base side rotation restricting convex portion that restricts the amount of rotation of the internal gear by projecting to the facing portion side and restricting the movement of the gear side rotation restricting convex portion,
The reclining mechanism according to claim 18, wherein one end of the urging member is hooked to the base-side rotation restricting convex portion in the guide portion.
An operation member that is rotatably supported with respect to the base plate and that moves to move the slide cam to the lock position or the release position;
The slide cam extends from the rotation center of the operation member toward one of the movement directions of the slide cam as viewed from the rotation axis direction of the operation member, and on the side opposite to the base plate. A drive projection that projects the engagement of the operation member to the slide cam by projecting and engaging the operation member;
The driving convex portion is disposed on the extension portion side with respect to a straight line extending in a direction orthogonal to the moving direction through the rotation center of the operation member when viewed from the rotation axis direction. The reclining mechanism according to claim 1.