JP2014121377A - Reclining device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a reclining device for improving the radial positioning accuracies of two members of relative rotations.SOLUTION: A reclining device 100 comprises: a base plate 1; an internal gear 2 having internal teeth 22 formed on an inner circumference; a lock gear 3 interposed between the base plate 1 and the internal gear 2 and made movable between a meshing position to mesh with the internal teeth 22 and a release position released from the engagement with the internal teeth 22; and an assembly plate 6 for assembling the base plate 1 and the internal gear 2 relatively rotatably. The assembly plate 6 includes a cylindrical portion 61 formed in a cylindrical shape, and an annular portion 62 disposed at one end edge of the cylindrical portion 61 and formed in a plate shape and in an annular shape. The cylindrical portion 61 is jointed to the base plate 1. An inner circumferential edge 62a of the annular ring portion 62 makes slide contact with a first boss portion 24 protruding from the back face 23a of the internal gear 2.

Description

  The technology disclosed herein relates to a reclining device that tilts a seat cushion with respect to a seat back.

  Patent Document 1 discloses a reclining device that tilts a seat cushion with respect to a seat back.

  Specifically, the reclining device described in Patent Document 1 includes a guide bracket attached to one of the seat cushion and the seat back, an internal gear attached to the other of the seat cushion and the seat back, and a diameter linked to the movement of the cam. A pair of lock gears that slide in a direction, and a mounting ring that integrally assembles the guide bracket and the internal gear while the cam and the lock gear are accommodated between the guide bracket and the internal gear. . The mounting ring has a cylindrical side portion formed in a cylindrical shape, and the cylindrical side portion is joined to one of the guide bracket and the internal gear. The inner peripheral surface of the cylindrical side portion is in sliding contact with the outer peripheral surface of the guide bracket and the internal gear where the cylindrical side portion is not joined. Thereby, the radial positioning of the guide bracket and the internal gear is performed.

JP 2006-204896 A

  By the way, in the said structure, the attachment ring is comprised with the plate-shaped member. Such a plate-like cylindrical member is generally formed by extruding a plate material into a cylindrical shape. Such a plate-shaped cylindrical member is difficult to achieve high shape accuracy. In the reclining device, when the accuracy of the inner peripheral surface of the cylindrical side portion of the mounting ring is low, the positioning accuracy in the radial direction between the guide bracket and the internal gear is deteriorated.

  The technology disclosed herein has been made in view of such a point, and an object thereof is to improve the radial positioning accuracy of two members that rotate relative to each other in the reclining device.

  The technique disclosed herein is intended for a reclining device that tilts a seat cushion with respect to a seat back. The reclining device includes a first member attached to one of the seat cushion and the seat back, and an annular second member attached to the other of the seat cushion and the seat back and having inner teeth formed on an inner peripheral surface. And between the first member and the second member, the first member and the second member cannot be rotated relative to each other by meshing with the inner teeth, while being engaged with the inner teeth. A lock gear that allows the first member and the second member to rotate relative to each other by releasing the engagement, and a mounting plate that assembles the first member and the second member so as to allow relative rotation. The member includes a cylindrical portion formed in a cylindrical shape, and an annular portion provided at one end edge of the cylindrical portion and formed in an annular shape, and the cylindrical portion includes the first member and the second member. Joined to one side of the front One of the first member and the second member, to which the cylindrical portion is not joined, has a back surface facing the annular portion and a boss portion protruding from the back surface, and an inner peripheral edge of the annular portion Shall be in sliding contact with the boss.

  According to the above configuration, the cylindrical portion of the attachment member is joined to one of the first member and the second member. The other of the first member and the second member is in sliding contact with the boss portion of the inner peripheral edge of the annular portion of the mounting member. In the case where the cylinder and the ring are formed with plate-shaped members, the shape accuracy is easier to improve on the inner peripheral edge of the ring than on the inner peripheral surface of the cylinder. Therefore, when positioning the first member or the second member, positioning accuracy can be improved by positioning at the inner peripheral edge of the annular portion rather than positioning at the inner peripheral surface of the cylindrical portion.

  According to the reclining device, it is possible to improve the radial positioning accuracy of the two members that rotate relative to each other.

It is a perspective view of a reclining device. It is the perspective view of a reclining device seen from the angle different from FIG. It is a disassembled perspective view of the reclining apparatus seen from the angle corresponding to FIG. It is a disassembled perspective view of the reclining apparatus seen from the angle corresponding to FIG. It is a front view which shows the lock gear and cam of an engagement state. It is a front view which shows the lock gear and cam of a releasing state. FIG. 3 is an enlarged cross-sectional view centering on peripheral portions of a base plate 1 and an internal gear 2.

  Hereinafter, exemplary embodiments will be described in detail with reference to the drawings.

<Configuration of reclining device>
1 is a perspective view of the reclining device 100, FIG. 2 is a perspective view of the reclining device 100 viewed from an angle different from FIG. 1, and FIG. 3 is a reclining view viewed from an angle corresponding to FIG. FIG. 4 is an exploded perspective view of the reclining device 100 as seen from an angle corresponding to FIG. 2.

  The reclining device 100 is a device that tilts a seat back (not shown) with respect to the seat cushion. The reclining device 100 includes a base plate 1 attached to the seat cushion, an internal gear 2 attached to the seat back, four lock gears 3, 3... Provided between the base plate 1 and the internal gear 2, and the base plate 1. , A cam 4 for moving the lock gears 3, 3,..., A spacer 5 provided between the lock gears 3, 3,. A mounting plate 6 for assembling the internal gear 2 so as to be relatively rotatable about the rotation axis X, a shaft 7 connected to the cam 4 and extending along the rotation axis X, a spiral spring 8 for urging the cam 4, and a shaft 7 And a push nut 9 functioning as a retaining stopper.

  In the reclining device 100, when the lock gears 3, 3,... Mesh with the internal gear 2, the relative rotation between the base plate 1 and the internal gear 2 becomes impossible, while the lock gears 3, 3,. By releasing the engagement, the base plate 1 and the internal gear 2 can be rotated relative to each other.

  The base plate 1 is a disk-shaped member and is a member for guiding the lock gears 3, 3,. The base plate 1 has a disk-shaped plate main body 10 and four guide portions 11, 11,... Provided on one surface of the plate main body 10. The base plate 1 is an example of a first member.

  The plate body 10 has a through hole 13 formed in the center. The through hole 13 is formed with a notch 13a with which the spiral spring 8 is engaged. The guide portion 11 has a fan shape with a central angle of approximately 90 °. The four guide portions 11, 11,... Are arranged at equal intervals in the circumferential direction around the rotation axis X. A cross-shaped guide groove 12 is formed by the four guide portions 11, 11,. The lock gear 3 is disposed between two guide portions 11 and 11 that are adjacent to each other in the circumferential direction.

  The internal gear 2 is a bottomed cylindrical member. The internal gear 2 includes an annular gear main body 21, internal teeth 22 formed on the inner peripheral surface of the gear main body 21, a bottom wall 23 provided on the gear main body 21, and a back side of the bottom wall 23. The first boss portion 24 provided on the first boss portion 24 and the second boss portion 25 provided on the first boss portion 24 are provided. The internal gear 2 is an example of a second member, and the first boss portion 24 is an example of a boss portion.

  The gear body 21 has an inner diameter that can accommodate the four guide portions 11, 11,... And the four lock gears 3, 3,. The internal teeth 22 are formed around the entire inner peripheral surface of the gear main body 21. The back side of the bottom wall 23 is formed in a step shape by the first and second boss portions 24 and 25. Specifically, a first boss portion 24 having a smaller diameter than the gear main body portion 21 is provided on the back surface 23a of the bottom wall 23 so as to protrude in the direction of the rotation axis X. On the back surface 24 a of the first boss portion 24, a second boss portion 25 having a smaller diameter than the first boss portion 24 is provided so as to protrude in the rotation axis X direction. A tapered portion 24b formed in a tapered shape is provided at the corner between the first boss portion 24 and the back surface 23a. A through hole 26 is formed in the center of the bottom wall 23.

  The lock gear 3 is a plate-like member. The lock gear 3 includes a gear main body 31, external teeth 32 formed on one end edge of the gear main body 31, and engagement claws 33 formed on an edge of the gear main body 31 that faces the external teeth 32. The shoulder portion 34 is formed on the same edge as the engaging claw 33.

  As described above, the lock gear 3 is disposed between the two guide portions 11 and 11 adjacent to each other in the circumferential direction of the plate main body portion 10. The lock gear 3 has a radial direction centered on the rotation axis X by two guide portions 11 and 11 (hereinafter, unless otherwise specified, “radial direction” means a radial direction centered on the rotation axis X). ). The external teeth 32 are located on the radially outer side, and the engaging claws 33 and the shoulders are located on the radially inner side.

  The cam 4 is a plate-like member. The cam 4 includes a cam main body 41, four engaging claws 42, 42,... Provided on the outer periphery of the cam main body 41, and four shoulders 43, 43,. ... and.

  The cam 4 is disposed at the center of the four lock gears 3, 3,. A substantially rectangular through hole 44 is formed in the center of the cam body 41. The shaft 7 is fitted in the through hole 44 so as not to rotate. The four engaging claws 42, 42,... Are arranged at equal intervals in the circumferential direction around the rotation axis X. The engaging claw 42 extends while being inclined in the circumferential direction with respect to the radial direction. The engagement claw 42 has a shape that engages with the engagement claw 33 of the lock gear 3. The shoulder 43 is provided adjacent to the engaging claw 42.

  The spacer 5 is an annular member, and is interposed between the internal gear 2 and the four lock gears 3, 3,.

  The mounting plate 6 is a plate-like member and is joined to the base plate 1. The mounting plate 6 includes a cylindrical portion 61 formed in a cylindrical shape, and an annular portion 62 provided at one end edge of the cylindrical portion 61 and formed in a plate shape and in an annular shape. The mounting plate 6 is an example of a mounting member.

  The inner diameter of the cylindrical portion 61 is substantially the same as the outer diameter of the base plate 1 and is larger than the outer diameter of the gear main body portion 21 of the internal gear 2. The inner diameter of the annular portion 62 is substantially the same as the outer diameter of the first boss portion 24 of the internal gear 2. A plurality of projecting portions 63, 63,... Projecting toward the back surface 23 a of the internal gear 2 are formed on the annular portion 62.

  The shaft 7 is a member for operating the cam 4. The shaft 7 includes a shaft main body 71, a diameter-enlarged portion 72 provided in the shaft main body 71 and loosely fitted in the through hole 26 of the internal gear 2, and a square portion 73 fitted in the through hole 44 of the cam 4. have. Since the enlarged diameter portion 72 is loosely fitted in the through hole 26, the shaft 7 is rotatable with respect to the internal gear 2. On the other hand, since the rectangular portion 73 is fitted in the through hole 44, the cam 4 rotates integrally with the shaft 7.

  The spiral spring 8 is a member that biases the shaft 7 in one direction around the rotation axis X. The spiral spring 8 is formed at a spring main body portion 81 formed in a spiral shape, a first engagement portion 82 formed at an outer end portion of the spring main body portion 81, and an inner end portion of the spring main body portion 81. And a second engaging portion 83.

  The spiral spring 8 is disposed inside the through hole 13 of the base plate 1, and the first engagement portion 82 engages with the notch portion 13 a. The second engaging portion 83 engages with the rectangular portion 73 of the shaft 7. That is, the spiral spring 8 is engaged with the rectangular portion 73 of the shaft 7 so as not to rotate. At this time, the spiral spring 8 urges the shaft 7 in one direction around the rotation axis X.

  The push nut 9 is an annular member. The inner diameter of the push nut 9 is slightly smaller than the outer diameter of the shaft main body 71 of the shaft 7. A cut extending in the radial direction is formed in the inner peripheral edge of the push nut 9, and the inner peripheral edge of the push nut 9 is configured to be able to expand the diameter. The push nut 9 is fitted on the shaft 7.

<Assembly of reclining device>
Next, assembly of the reclining device 100 will be described.

  First, the lock gears 3, 3,..., The cam 4 and the spacer 5 are assembled between the base plate 1 and the internal gear 2. Specifically, the four lock gears 3, 3,... Are respectively arranged in the guide grooves 12, 12,. The cam 4 is arranged at the center of the four lock gears 3, 3,. At this time, the engaging claws 42, 42,... Of the cam 4 are engaged with the engaging claws 33, 33,. The lock gears 3, 3,... And the cam 4 thus combined are sandwiched between the base plate 1 and the internal gear 2. At this time, the spacer 5 is disposed between the four lock gears 3, 3... And the bottom wall 23 of the internal gear 2. The end of the gear body 21 opposite to the bottom wall 23 is in contact with the plate body 10 of the base plate 1.

  Then, the shaft 7 is inserted through the through hole 26 of the internal gear 2. The shaft main body 71 passes through the through hole 44 of the cam 4, and the square part 73 is fitted into the through hole 44. At this time, the shaft main body 71 also penetrates the through hole 13 of the base plate 1. A spiral spring 8 is installed in the through hole 13. The first engaging portion 82 of the spiral spring 8 is fitted into the notch 13 a, and the second engaging portion 83 is engaged with the rectangular portion 73 of the shaft 7. In this state, the push nut 9 is fitted on the shaft main body 71. Although the inner diameter of the push nut 9 is slightly smaller than the outer diameter of the shaft main body 71, the inner peripheral edge of the push nut 9 is enlarged, so that the push nut 9 can be fitted on the shaft main body 71. The push nut 9 is pushed to a position approaching the spiral spring 8 or a position contacting the spiral spring 8. In this way, the push nut 9 functions as a retaining member for the spiral spring 8 from the shaft 7. Further, the cam 4 sandwiched between the base plate 1 and the internal gear 2 is sandwiched between the push nut 9 and the enlarged diameter portion 72 of the shaft 7. Therefore, the push nut 9 also functions as a retaining member that prevents the shaft 7 from slipping out of the internal gear 2.

  Thereafter, the mounting plate 6 is fitted into the outer periphery of the base plate 1 from the internal gear 2 side. The protrusions 63, 63,... Of the mounting plate 6 abut on the back surface 23 a of the internal gear 2. In this state, the cylindrical portion 61 of the mounting plate 6 is joined to the outer peripheral surface of the plate main body portion 10 of the base plate 1 by welding.

  Thus, the assembly of the reclining device 100 is completed. The assembly of the reclining device 100 is not limited to the order described above, and can be assembled in any order as long as the reclining device 100 can be assembled. For example, after the mounting plate 6 is welded, the shaft 7 may be inserted and the spiral spring 8 may be installed.

  After assembly of the reclining device 100 is completed, the base plate 1 is attached to the seat cushion mounting bracket, and the internal gear 2 is attached to the seat back.

<Operation of reclining device>
Next, the operation of the reclining device 100 will be described. FIG. 5 is a front view showing the lock gear and cam in the engaged state, and FIG. 6 is a front view showing the lock gear and cam in the released state.

  As described above, the cam 4 is non-rotatably attached to the rectangular portion 73 of the shaft 7, and the second engaging portion 83 of the spiral spring 8 is engaged with the rectangular portion 73. Therefore, the urging force of the spiral spring 8 is transmitted to the cam 4 via the shaft 7. Normally, the cam 4 is urged in one direction around the rotation axis X (hereinafter referred to as “engagement direction”) by the urging force of the spiral spring 8. This engagement direction is a direction in which the lock gears 3, 3,... Are pushed outward in the radial direction, and is a counterclockwise direction in FIGS. That is, the cam 4 is normally rotated in the engagement direction by the urging force of the spiral spring 8. At this time, the engaging claw 42 of the cam 4 is in contact with the shoulder 34 of the lock gear 3, and the shoulder 43 of the cam 4 is in contact with the engaging claw 33 of the lock gear 3. Thereby, the lock gear 3 is pressed by the cam 4 and moves outward in the radial direction, and the external teeth 32 mesh with the internal teeth 22 of the internal gear 2 although illustration is omitted. This position corresponds to the meshing position. Thus, at the normal time, the reclining device 100 is in an engaged state in which the lock gears 3, 3,... In the engaged state, the seat cushion cannot rotate with respect to the seat back.

  From this state, when the shaft 7 is rotated in the direction opposite to the engagement direction, the cam 4 rotates in the other direction around the rotation axis X (hereinafter referred to as “release direction”). Then, the engaging claw 42 of the cam 4 engages with the engaging claw 33 of the lock gear 3 to move the lock gear 3 inward in the radial direction. As a result, the meshing between the external teeth 32 of the lock gear 3 and the internal teeth 22 of the internal gear 2 is released. This position corresponds to the release position. Thus, the reclining device 100 is in a released state in which the meshing between the lock gears 3, 3,. In the released state, the seat cushion can rotate with respect to the seat back.

  When the force rotating the shaft 7 is removed, the shaft 7 is rotated in the engagement direction by the urging force of the spiral spring 8, and the lock gears 3, 3,.

<Internal gear positioning>
FIG. 7 shows an enlarged cross-sectional view centering on the peripheral portions of the base plate 1 and the internal gear 2. In the reclining device 100 configured as described above, the positioning of the internal gear 2 in a plane orthogonal to the rotation axis X is performed by the mounting plate 6. Specifically, the outer peripheral surface of the first boss portion 24 of the internal gear 2 is in sliding contact with the inner peripheral edge 62 a of the annular portion 62 of the mounting plate 6. At this time, a gap is formed between the outer peripheral surface of the gear main body portion 21 of the internal gear 2 and the inner peripheral surface of the cylindrical portion 61 of the mounting plate 6.

  When the mounting plate 6 is manufactured, a sheet metal is formed into a bottomed cylindrical shape by pressing, and a circular opening is formed at the bottom of the cylinder by punching. Thus, the mounting plate 6 having the cylindrical portion 61 and the annular portion 62 is manufactured. Usually, the shape accuracy is higher in punching than in pressing. Therefore, in the mounting plate 6 formed of sheet metal in this way, the shape accuracy such as the roundness of the inner peripheral edge 62 a of the annular portion 62 is higher than the shape accuracy of the inner peripheral surface of the cylindrical portion 61.

  That is, the positioning accuracy of the internal gear 2 can be improved by positioning the internal gear 2 not by the cylindrical portion 61 of the mounting plate 6 but by the annular portion 62. Further, the inner peripheral edge 62 a of the annular portion 62 is slidably contacted with the internal gear 2, so that the mounting plate 6 and the internal gear 2 can be compared with the configuration in which the inner peripheral surface of the cylindrical portion 61 is slidably contacted with the internal gear 2. The contact area can be reduced. Thereby, the sliding resistance of the internal gear 2 can be reduced.

  Further, in the internal gear 2, tapered portions 24 b are provided at the corners between the back surface 23 a and the first boss portion 24. Therefore, when the internal gear 2 is displaced in the direction away from the base plate 1 in the rotation axis X direction, the tapered portion 24b comes into contact with the inner peripheral edge 62a of the annular portion 62 of the mounting plate 6 and the internal gear 2 in the rotation axis X direction. Movement is restricted. Furthermore, since the taper portion 24b is formed in a taper shape, if the internal gear 2 is displaced in a direction away from the base plate 1 in the direction of the rotation axis X, the internal gear 2 is also moved in a direction perpendicular to the rotation axis X. More regulated. Thus, the positioning accuracy of the internal gear 2 in the direction of the rotation axis X and the direction orthogonal to the rotation axis X can be improved.

<effect>
Therefore, the reclining device 100 includes a base plate 1 attached to a seat cushion, an annular internal gear 2 attached to a seat back and having inner teeth 22 formed on an inner peripheral surface, the base plate 1 and the internal gear 2. The base plate 1 and the internal gear 2 are made relatively non-rotatable by meshing with the internal teeth 22, while the base plate 1 and the internal gear 2 are released by disengaging the internal teeth 22. A lock gear 3 for relatively rotating the internal gear 2 and a mounting plate 6 for assembling the base plate 1 and the internal gear 2 for relative rotation are provided, and the mounting plate 6 is a cylinder formed in a cylindrical shape. Part 61 and provided at one end edge of the cylindrical part 61, are plate-like and have an annular shape The cylindrical portion 61 is joined to the base plate 1, and the internal gear 2 includes a back surface 23 a facing the annular portion 62, and a first protruding from the back surface 23 a. The inner peripheral edge 62 a of the annular portion 62 is in sliding contact with the first boss portion 24.

  According to the above configuration, the internal gear 2 that can rotate relative to the base plate 1 is positioned in the plane perpendicular to the rotation axis X by the inner peripheral edge 62 a of the annular portion 62. The inner peripheral edge 62 a of the annular part 62 has a higher shape accuracy than the inner peripheral surface of the cylindrical part 61. Therefore, the positioning accuracy of the internal gear 2 can be improved as compared with the case where the positioning is performed by the cylindrical portion 61 of the mounting plate 6.

  Further, a tapered portion 24b formed in a tapered shape is provided at a corner portion formed by the back surface 23a and the first boss portion 24.

  According to the above configuration, the movement of the internal gear 2 in the direction of the rotation axis X can be restricted by the contact between the tapered portion 24 b and the inner peripheral edge 62 a of the annular portion 62. In addition, the contact accuracy between the tapered portion 24 b and the inner peripheral edge 62 a of the annular portion 62 further improves the positioning accuracy of the internal gear 2 in the direction orthogonal to the rotation axis X.

<< Other Embodiments >>
As described above, the embodiment has been described as an example of the technique disclosed in the present application. However, the technology in the present disclosure is not limited to this, and can also be applied to an embodiment in which changes, replacements, additions, omissions, and the like are appropriately performed. Moreover, it is also possible to combine each component demonstrated by the said embodiment and it can also be set as new embodiment. In addition, among the components described in the accompanying drawings and detailed description, not only the components essential for solving the problem, but also the components not essential for solving the problem in order to exemplify the above technique. May also be included. Therefore, it should not be immediately recognized that these non-essential components are essential as those non-essential components are described in the accompanying drawings and detailed description.

  About the said embodiment, it is good also as following structures.

  The attachment plate 6 is joined to the base plate 1, but may be joined to the internal gear 2. Specifically, the attachment plate 6 is attached from the base plate 1 side so that the base plate 1 is sandwiched between the annular portion 62 and the internal gear 2. The cylindrical portion 61 of the mounting plate 6 is joined to the outer peripheral surface of the gear main body portion 21 of the internal gear 2. In this case, a boss portion is formed on the back surface of the base plate 1, and the inner peripheral edge 62 a of the annular portion 62 of the mounting plate 6 comes into sliding contact with the boss portion of the base plate 1. In this case, the base plate 1 is the second member, and the internal gear 2 is the first member.

  In the embodiment, three lock gears 3 are provided, but the number of lock gears 3 is not limited to this. As long as the base plate 1 and the internal gear 2 can be switched between non-rotatable and rotatable, the number of the lock gears 3 can be arbitrarily set.

  The lock gear 3 is moved by the cam 4 and the shaft 7, but the configuration for moving the lock gear 3 is not limited to this. Any configuration can be adopted as long as the lock gear 3 can be moved between the meshing position and the release position.

  As described above, the technology disclosed herein is useful for a reclining device that tilts a seat cushion with respect to a seat back.

100 Reclining device 1 Base plate (first member)
2 Internal gear (second member)
22 Internal teeth 23a Back surface 24 First boss part (boss part)
24b Taper 3 Lock gear 6 Mounting plate (Mounting member)
61 cylindrical part 62 annular part 62a inner periphery

Claims (2)

A reclining device for tilting a seat cushion with respect to a seat back,
A first member attached to one of the seat cushion and the seat back;
An annular second member attached to the other of the seat cushion and the seat back and having inner teeth formed on an inner peripheral surface;
It is provided between the first member and the second member, and engages with the inner teeth while making the first member and the second member non-rotatable by meshing with the inner teeth. A lock gear that allows the first member and the second member to rotate relative to each other by being released;
An attachment member for assembling the first member and the second member in a relatively rotatable manner;
The mounting member includes a cylindrical portion formed in a cylindrical shape, and an annular portion that is provided at one end edge of the cylindrical portion and has a plate shape and an annular shape,
The cylindrical portion is joined to one of the first member and the second member,
Of the first member and the second member, the one where the cylindrical portion is not joined has a back surface facing the annular portion, and a boss portion protruding from the back surface,
A reclining device in which an inner peripheral edge of the annular portion is in sliding contact with the boss portion. The reclining device according to claim 1.
A reclining device in which a tapered portion formed in a tapered shape is provided at a corner portion constituted by the back surface and the boss portion.

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