JP6824108B2 - Reclining device - Google Patents

Description

The present invention relates to a reclining device.

In a conventional reclining device called a manual type round reclining, the reclining device has a first lock gear and a second lock gear, and the first lock gear is a first guide surface of one guide convex portion and a second of the guide convex portions. 1 The movable guide guided by the guide surface is guided and slidably supported only in the radial direction, and the second lock gear is one of the guide convex portions and the other of the guide convex portions. Some of them are guided by the second guide surface of the above and are slidably supported only in the radial direction. In such a reclining device, in order to eliminate the bias between the load of the first lock gear acting via the movable guide and the load of the second lock gear, the other first guide of the second guide surface with respect to the first lock gear The other second guide surface in the same rotation direction as the surface may have a recess formed to reduce the contact area with the second lock gear.

However, the gear strength of the lock gear when a moment load is applied to the reclining device in the rotational direction is not the same as that of the first lock gear and the second lock gear regardless of the presence or absence of the movable guide. This is because a gap is provided between the second lock gear side and the central cam in order to secure the lock-in performance. Due to this gap, the gear strength of the second lock gear is lower than that of the first lock gear. Therefore, it is necessary to eliminate the bias between the load of the first lock gear and the load of the second lock gear regardless of the presence or absence of the movable guide. Further, in the conventional shape, the load balance is not uniform at the start of deformation and the deformation of the guide convex portion, and the guide strength ratio between the first lock gear side and the second lock gear side changes as the change progresses. It will get smaller. That is, there is a problem that the biased state in which the guide strength on the second lock gear side is relatively increased becomes stronger.

Japanese Unexamined Patent Publication No. 2012-56397

The present invention has been made in view of such a problem, and the ratio of the load balance between the first lock gear and the second lock gear changes between the start of deformation of the guide portion and the time of deformation or after deformation. It is an object of the present invention to provide a reclining device capable of reducing the number of cases.

The present invention has taken the following measures to achieve at least one of the above-mentioned main objectives.

The reclining device according to the present invention is
A base plate in which a plurality of lock gear guide portions are formed by guide portions having a guide surface, and
A first lock gear having external teeth on the outer peripheral surface and slidably arranged on the lock gear guide portion,
A second lock gear having external teeth on the outer peripheral surface, movably arranged on the lock gear guide portion, and arranged at a different angle with respect to the first lock gear.
A gear plate having internal teeth that can be fitted with the external teeth of the first lock gear and the external teeth of the second lock gear.
A central cam that moves the first lock gear and the second lock gear so that they can be fitted with the internal teeth of the gear plate.
Of the guide surfaces, a concave load balance maintaining recess formed on at least one of the guide surfaces in contact with the second lock gear,
With
The load balance holding recess is the same as the circumferential surface of the guide portion within a range of at least 1 mm from the guide surface on the outer peripheral surface side of the inner surface of the load balance holding recess and excluding the chamfered portion. It is characterized in that it is formed by a surface that is the same as the virtual surface of curvature or is arranged on the outer peripheral side.

Further, in the reclining device according to the present invention,
Further, the urging member for urging the central cam and
A cam plate that is attached to the central cam and moves the first lock gear and the second lock gear in the inner peripheral direction by moving the urging member in the direction opposite to the urging direction.
It may be characterized by being provided with.

Further, the reclining device according to the present invention may be characterized in that a movable guide is provided between the first lock gear and the guide portion.

Further, in the reclining device according to the present invention, the load balance holding recess is on the outer peripheral surface side of the inner surface of the recess, and the guide portion is within a range of at least 3 mm from the guide surface except for the chamfered portion. It may be characterized in that it is formed by the same surface as the virtual surface having the same curvature on the circumferential surface and the surface arranged on the outer peripheral side.

Further, in the reclining device according to the present invention, the first recess is formed on the guide surface in contact with the first lock gear and in the same circumferential direction as the load balance holding recess. The reclining device according to any one of claims 1 to 4.

Further, in the reclining device according to the present invention, the first lock gear and the second lock gear are each composed of a pair of lock gears arranged so as to face each other with respect to the center.
The reclining device according to any one of claims 1 to 5, wherein the first lock gear and the second lock gear are arranged so as to be offset by 90 °.

FIG. 1 is an exploded perspective view showing an outline of the configuration of the reclining device 100 according to the present embodiment. FIG. 2 is a perspective view showing a base plate 10 of the reclining device 100 according to the present embodiment. FIG. 3 is a perspective view showing a lock gear 20 and a central cam 30 of the reclining device 100 according to the present embodiment. FIG. 4 is a perspective view and a rear view showing the back surface side of the gear plate 60 of the reclining device 100 according to the present embodiment. FIG. 5 is a schematic view showing a state in which the reclining device 100 according to the present embodiment is mounted on a vehicle seat. FIG. 6 is an explanatory diagram for explaining the movement of the reclining device 100 according to the present embodiment. FIG. 7 is an explanatory diagram for explaining the movement of the reclining device 100 according to the present embodiment. FIG. 8 is an explanatory diagram for explaining the form of the load balance holding recess 15 of the guide portion 12 of the reclining device 100 according to the present embodiment. FIG. 9 is a schematic view showing a deformed state of the guide portion 12 of the reclining device 100 according to the present embodiment. FIG. 10 is a front view of the reclining device 100 according to the second embodiment.

(First Embodiment)
Next, the first embodiment of the reclining device 100 according to the present invention will be described in detail with reference to the drawings. It should be noted that the embodiments and drawings described below exemplify a part of the embodiments of the present invention, are not used for the purpose of limiting to these configurations, and do not deviate from the gist of the present invention. It can be changed as appropriate within the range.

As shown in FIG. 1, the reclining device 100 according to the present invention mainly includes a circular base plate 10, four lock gears 20 arranged on the base plate 10, a central cam 30 arranged at the center of the lock gear 20, and a cam plate. 40, a urging member 50, a gear plate 60 having internal teeth 61 (see FIG. 4) on the inner circumference, and a cover bracket 70.

As shown in FIG. 2, the base plate 10 has a pair of first lock gear guide portions 11a and a pair of second lock gear guide portions 11b that guide the slide movement of the four lock gears 20 in the radial direction from the center. ing. The pair of first lock gear guide portions 11a are arranged so as to face each other at the center of the base plate 10, and the pair of second lock gear guide portions 11b are arranged so as to face each other at the center of the base plate 10. It is arranged so as to be offset by 90 ° at the center of the base plate 10 with respect to the first lock gear guide portion 11a. Guide portions 12 are formed on both side surfaces of the lock gear guide portion 11. The guide portion 12 is formed so as to project from the inner surface of the base plate 10, and guide surfaces are formed on both sides of the lock gear guide portion 11. A first recess 14 for accommodating the end of the urging member 50 is formed on the guide surface on the right side of the first lock gear guide portion 11a when viewed in the radial direction from the center, and the second lock gear guide portion 11b is formed. A recess 15 for maintaining a load balance is formed on the guide surface of the above. That is, the first recess 14 and the load balance holding recess 15 are alternately provided on the guide surfaces on the same side in the rotation direction in the respective guide portions 12. The first recess 14 is tapered so that the distance from the first lock gear guide portion 11a becomes narrower toward the center, and the width narrower than the thickness of the urging member 50 on the most central side. Is formed to be. The load balance holding recess 15 balances the load applied to the guide portion 12 by the first lock gear 21 and the load applied to the guide portion 12 by the second lock gear 22, and also when the guide portion 12 is deformed. It is for maintaining balance. Details of the form and function of the load balance holding recess 15 will be described later.

As shown in FIG. 1 or 3, the lock gear 20 is approximately 90 at the center with respect to the pair of first lock gears 21 arranged to face the center of the base plate 10 and the first lock gear 21. It has a pair of second lock gears 22 that are offset (rotated) and placed opposite each other. In the present embodiment, the first lock gear 21 constitutes the main lock gear, and the second lock gear 22 constitutes the sublock gear. The lock gear 20 is formed to have a width substantially the same as the width of the lock gear guide portion 11 of the corresponding base plate 10, and is formed so as to be movable in the radial direction but substantially not to move in the circumferential direction. (There may be some rattling). External teeth 23 that mesh with the internal teeth 61 of the gear plate 60 are formed on the outer peripheral surface of the lock gear 20. On the other hand, a lock gear recess 24a is formed on the inner peripheral surface of each lock gear 20, and rear end protruding portions 24b are formed on both sides thereof. The lock gear 20 slides in the radial direction by moving the lock gear recess 24a and the rear end protruding portion 24b following the outer peripheral surface of the central cam 30, which will be described later. Each of the first lock gears 21 has a first protrusion 25 formed so as to project to the front side, and each of the second lock gears 22 is formed to project to the front side and It has a second protrusion 26 having a height lower than that of the first protrusion 25. The first protrusion 25 is arranged so as to protrude from the first cam hole 41 of the cam plate 40 described later, and the second protrusion 26 is arranged so as not to protrude from the second cam hole 42.

The central cam 30 is made of a plate-shaped member, and is provided with a pair of projecting pieces 31 capable of contacting the rear end projecting portions 24b on both sides of the lock gear recess 24 formed on the inner surface side of the lock gear 20. There is. The protruding pieces 31 are provided corresponding to a pair of the first lock gear 21 and the second lock gear 22, respectively, and a total of eight protruding pieces 31 are formed at four locations. Of the protruding pieces 31, the protruding piece 31 that comes into contact with the second lock gear 22 is formed to be slightly shorter than the protruding piece 31 of the first lock gear 21, and a gap is provided between the protruding piece 31 and the second lock gear 22. There is. This is to ensure lock-in performance. To ensure lock-in performance, it is ideal that the first lock gear 21 and the second lock gear 22 all mesh uniformly, but due to machining accuracy and machining error, the first lock gear 21 and the second lock gear 22 If no gap is set in any of the above, there is a possibility that only one of the lock gears 20 meshes and the other lock gear 20 does not mesh. Therefore, a gap is provided between the first lock gear 21 on the main lock side and the second lock gear 22 so as to surely mesh with the first lock gear 21. A central cam recess 33 is provided between the projecting pieces 31. At the center of the central cam 30, a shaft through hole 35 into which an operating shaft 90 for operating the central cam 30 is inserted is formed in a substantially cross shape. Further, around the shaft through hole 35, two central cam protrusions 36 and two through holes 37 for urging members are alternately formed.

The cam plate 40 is a member for moving the lock gear 20 by the movement of the operation shaft 90. As shown in FIG. 1, the cam plate 40 is provided with a first cam hole 41 at a position corresponding to the first protrusion 25 of the pair of first lock gears 21, and the pair of second lock gears 22 has a second cam plate 40. A second cam hole 42 is provided at a position corresponding to the two protrusions 26. The first cam hole 41 and the second cam hole 42 are both wider than the first protrusion 25 and the second protrusion 26, and the outer peripheral surfaces of the first cam hole 41 and the second cam hole 42 are rotated (). In the present embodiment, the cam plate 40 is formed on a surface that gradually becomes closer to the center (counterclockwise), and the first protrusion 25 and the second protrusion 26 are formed by rotating the cam plate 40 counterclockwise. Press and move toward the center. Further, the cam plate 40 has an interference prevention hole 43 for preventing interference with the urging member 50, a fitting hole 44 for fitting with the central cam protrusion 36, an operation shaft 90, and the urging member 50. Is provided with an insertion hole 45 into which the is inserted.

The urging member 50 is made of a curved spring material, one end portion 51 is inserted into the urging member through hole 37 of the central cam 30, and the other end portion 52 is inserted into the first recess 14 of the base plate 10. The urging member 50 is attached so as to urge in a direction in which the curvature of the curve increases, the other end 52 inserted into the first recess 14 is in the central direction of the base plate 10, and the central cam 30 is in the locking direction ( It is urged in the clockwise direction).

As shown in FIG. 4, the gear plate 60 is provided with internal teeth 61 that mesh with the lock gear 20. Further on the inner side of the inner teeth 61, a first protrusion support portion 62 provided in an arc shape and having a step on the inner peripheral side with respect to the outer peripheral side is provided.

The cover bracket 70 is a cover for assembling the base plate 10 and the gear plate 60 so as to be relatively rotatable, and the form thereof is not particularly limited.

In each of the components manufactured as described above, the lock gear 20 is arranged with respect to the lock gear guide portion 11 of the base plate 10 as shown in FIG. The pair of first lock gears 21 are arranged in the first lock gear guide portion 11a provided with the first recess 14 shown in FIG. 2, and the pair of second lock gears 22 are provided with the load balance holding recess 15. It is arranged in the second lock gear guide portion 11b. A central cam 30 is arranged at the center of these lock gears 20. Then, after the central cam 30 is attached to the central cam protruding portion 36 while being fitted into the fitting hole 44 of the cam plate 40, one end portion 51 of the urging member 50 is inserted into the urging member through hole 37 of the central cam 30. The other end 52 is inserted into the first recess 14 of the base plate 10. After that, the gear plate 60 is covered so that the internal teeth 61 of the gear plate 60 and the external teeth 23 of the lock gear 20 mesh with each other, and then fixed with the cover bracket 70 to complete the reclining device 100.

As shown in FIG. 5, the reclining device 100 completed in this manner fixes the base plate 10 to the seat back 201 of the vehicle seat 200 via the seat back bracket 202, and gears to the seat cushion 203 via the seat cushion bracket 204. By fixing the plate 60, it is assembled to the vehicle seat 200.

Next, a method of operating the reclining device 100 assembled as described above will be described. As shown in FIG. 6, when the seat back 201 of the vehicle seat 200 is in the driving posture position, that is, when the seat back 201 is upright and the operation lever 205 is not operated, as shown in FIG. , The central cam 30 is urged by the urging member 50 in the clockwise rotation direction (direction of the arrow). By this urging force, the protruding piece 31 of the central cam 30 presses the rear end protruding portion 24b of the lock gear 20. Therefore, the external teeth 23 of all the lock gears 20 mesh with the internal teeth 61 of the gear plate 60, and the positions of the base plate 10 and the gear plate 60 are fixed and do not rotate relatively. That is, the seat back 201 is in a fixed state. Further, in this state, the other end 52 of the urging member 50 is urged in the center direction in the first recess 14. Since the first recess 14 is formed so that the distance from the first lock gear 21 becomes narrower toward the center, the first lock gear 21 is fixed by strongly pressing the first lock gear 21. At the same time, it prevents rattling.

To move the seat back 201 from this state, that is, to bring it into the unlocked state, the operating lever 205 is operated. By pulling the operating lever 205 upward, the operating shaft 90 rotates in the counterclockwise rotation direction, so that the central cam 30 rotates in the counterclockwise rotation direction (arrow direction in FIG. 7). As a result, as shown in FIG. 7, the protruding piece 31 of the central cam 30 moves to the position of the lock gear recess 24 of the lock gear 20, and the lock gear 20 can move toward the center of the base plate 10. At the same time, by moving one end 51 of the urging member 50 in the counterclockwise direction, the urging direction of the other end 52 is changed from urging in the central direction to urging in the radial direction. As a result, the pressing force on the lock gear 20 is released, the fixing of the first lock gear 21 is released, and the lock gear 21 can be moved toward the center. Further, since the cam plate 40 (represented by the dotted line) is fitted with the central cam protruding portion 36 of the central cam 30 at the fitting hole 44, the cam plate 40 is also interlocked with the movement of the central cam 30. Rotate in the direction of the arrow. By the rotation of the cam plate 40, the positions of the first cam hole 41 and the second cam hole 42 of the cam plate 40 are moved, and the first protrusion 25 of the first lock gear 21 and the second lock gear 22 are second. The two protrusions 26 slide and move on the outer peripheral surfaces of the first cam hole 41 and the second cam hole 42, respectively. Since the outer peripheral surfaces of the first cam hole 41 and the second cam hole 42 are formed so as to gradually become closer to the center when rotated to the left, the first lock gear 21 and the second lock gear 22 are respectively. , Will move toward the center. As a result, the outer teeth 23 of all the lock gears 20 and the inner teeth 61 of the gear plate 60 are disengaged, and the relative rotational movement between the base plate 10 and the gear plate 60 becomes possible. That is, the seat back 201 can be moved back and forth.

When the seat back 201 is moved to a position behind the predetermined position (a position other than the free position) and the operation lever 205 is released, the locked state is obtained by the reverse movement of the unlocked state described above. That is, by releasing the operating lever 205, the central cam 30 rotates in the direction of returning to the state shown in FIG. 6 due to the urging force of the urging member 50. As a result, the cam plate 40 also returns to the initial position, and the lock gear 20 can move in the radial direction. At the same time, the protruding piece 31 of the central cam 30 presses the rear end protruding portion 24b of the lock gear 20 to move the lock gear 20 in the radial direction. As a result, the outer teeth 23 of all the lock gears 20 mesh with the inner teeth 61 of the gear plate 60, the positions of the base plate 10 and the gear plate 60 are fixed to each other, and the relative rotation becomes impossible. At the same time, the other end 52 of the urging member 50 is urged toward the center in the first recess 14, and by strongly pressing the first lock gear 21, the position of the first lock gear 21 is fixed and rattling is prevented. To do. In this way, the seat back 201 is locked and fixed at a predetermined position.

On the other hand, when the operation lever 205 is released while the seat back 201 is moved to the front position (free position), in the free position, the first lock gear 21 has the first protrusion 25 supporting the first protrusion. It is arranged at a position in contact with the portion 62. Therefore, the central cam 30 is urged in the direction of returning to the initial position by the urging force of the urging member 50, but the first protrusion 25 of the first lock gear 21 has the first protrusion as shown in FIG. 4B. The portion supporting portion 62 prevents the movement in the radial direction. Therefore, the central cam 30 does not rotate back to the initial position. Therefore, the second lock gear 22 does not return to the initial position, and the outer teeth 23 of the first lock gear 21 and the second lock gear 22 and the inner teeth 61 of the gear plate 60 do not mesh with each other. Therefore, the base plate 10 and the gear plate 60 can be moved relative to each other, and the seat back 201 can be freely moved at any position in the free position.

Here, the form and function of the load balance holding recess 15 will be described in detail. The load balance holding recess 15 is mainly for adjusting the balance of the load applied to the guide portion 12 by the first lock gear 21 and the second lock gear 22, respectively. Since the first recess 14 is formed on the guide surface in contact with the first lock gear 21, the balance with the load applied by the first lock gear 21 is lost. Further, the gear strength of the lock gear 20 is not the same as that of the first lock gear 21 and the second lock gear 22. This is because a gap is provided between the second lock gear 22 and the central cam 30 in order to secure the lock-in performance as described above. Due to this gap, the gear strength of the second lock gear 22 becomes lower than that of the first lock gear 21. Since the gear strength of the second lock gear 22 is low, if the strength of the guide portion 12 is high, the input load may exceed the withstand load of the second lock gear 22 before sufficiently causing the guide deformation. For this reason, the load balance holding recess 15 is formed so that the loads applied by the first lock gear 21 and the second lock gear 22 are similarly or close to each other. Therefore, in the initial state, that is, when the guide surface of the guide portion 12 is not deformed at all, there is no problem if only the contact area of the guide surface is considered. In the conventional load balance maintaining recess 15, the emphasis is placed only on the area of the surface in contact with the lock gear 20, and since only this contact area is considered, the shape of the recess itself is not considered at all. , The form of the recess itself has been considered, either as a mere circumferential surface or only for convenience of fabrication.

On the other hand, the load balance holding recess 15 according to the present embodiment has a form in which deformation of the guide portion 12 is taken into consideration. A gear plate attached to the seat back 201 via the lock gear 20 when a strong load is applied to the seat back 201 or the like or a moment load is applied to the reclining device 100 in the rotational direction for a long period of time. The load from 60 is transmitted to the base plate 10, which may cause deformation of the guide surface of the guide portion 12. In the conventional shape, the load holding balance is not uniform at the start of deformation and at the time of deformation of the guide portion 12, and the guide strength ratio between the first lock gear 21 side and the second lock gear 22 side changes as the change progresses. Will become smaller. That is, the guide strength on the second lock gear 22 side becomes relatively high. Therefore, there is a possibility that the second lock gear 22 exceeds the load capacity first without fully utilizing the gear strength of the first lock gear 21.

Therefore, in the present invention, by devising the shape of the load balance holding recess 15, the guide strength ratio of the first lock gear 21 and the second lock gear 22 can be kept constant even when the guide portion 12 is deformed. It is something like that. The load from the second lock gear 22 applied to the guide surface having the load balance holding recess 15 is mainly the guide surface on the outer peripheral side of the load balance holding recess 15, and the strength of the guide surface on the outer peripheral side is adjusted. As a result, the load balance can be effectively adjusted. Therefore, in the present invention, as shown in FIG. 8, the concave shape of the load balance holding recess 15 is the entire range within at least 1 mm from the guide surface except for the chamfered portion 12a at the corner of the concave portion (upward diagonal line in FIG. 8). In the part), the surface 15a on the outer peripheral side of the load balance holding recess 15 is larger than the surface 15a or the virtual surface 13 which is the same as the virtual surface 13 formed by the surface having the same curvature as the circumferential surface 12b of the guide portion 12. It is formed by a surface 15b provided on the outer peripheral side. The surface provided on the outer peripheral side may be a surface having a large curvature of the curve of the concave portion. That is, in the load balance maintaining recess 15, the diagonally upward right portion is formed so as to have the same width downward or a narrower width toward the lower side. This is because when the guide portion 12 receives a load by the second lock gear 22, as shown in FIG. 9, a portion 12e that is pressed and dented and a portion 12d that rises due to the dent are formed. Due to this swelling, the guide surface in contact with the second lock gear 22 may become stronger and stronger. On the other hand, since the conventional load balancing holding recess 15d is formed so as to become wider toward the bottom, the guide strength is further increased, and the guide portion 12 of the second lock gear 22 is guided. There was a phenomenon in which the strength increased in proportion. On the other hand, since the width of the load balance holding recess 15 according to the present invention becomes the same or narrower, the rate at which the strength of the guide portion 12 of the second lock gear 22 increases should be reduced or not increased. Can be done. Therefore, the rate of change in the guide strength ratio between the first lock gear 21 side and the second lock gear 22 side can be reduced.

Preferably, the entire range within 3 mm from the guide surface (the region of the upward-sloping diagonal portion and the upwardly rising diagonal portion of FIG. 8) may be formed in the same manner. In the deformation of the guide portion 12 in normal use, 1 mm or less is sufficient, but when a sudden large load is applied such as when a vehicle collides, the guide portion 12 may be deformed by 1 mm or more. By adopting the above-mentioned shape in the entire range within 3 mm, it is possible to ensure the operation of the seat back 201 of the vehicle seat even in the event of a collision.

As described above, according to the present invention, the guide strength ratio can be made constant or a low rate of change before and after the deformation of the guide portion 12. As a result, it can be deformed while maintaining the load holding balance, and the load bearing performance of the lock gear 20 can be fully utilized.

(Second Embodiment)
The reclining device 100 according to the second embodiment is shown in FIG. FIG. 10 is a partial front view of the reclining device 100 according to the second embodiment. The reclining device 100 according to the second embodiment is movable between the first lock gear 21 and the guide portion 12 in the first lock gear guide portion 11a (see FIG. 2) as compared with the first embodiment. The difference is that the guide 80 is provided. Since other points are the same as those in the first embodiment, the description thereof will be omitted. In addition, in FIG. 10, the cam plate 40 is omitted.

The movable guide 80 is provided with a taper so that the width gradually narrows from the outer peripheral side toward the center, and is slidably provided between the first lock gear 21 and the guide portion 12. The movable guide 80 is provided with an insertion hole 81 into which the other end 52 of the urging member 50 can be inserted, and the movable guide 80 is urged in the central direction by the urging member 50. As a result, the first lock gear 21 can be pressed by the movable guide 80 to prevent the first lock gear 21 from rattling.

The method of operating the reclining device 100 in the second embodiment is the same as that in the first embodiment, except that the end portion of the urging member 50 moves together with the movable guide 80. That is, when the central cam 30 is urged in the clockwise rotation direction by the urging member 50, the other end 52 of the urging member 50 is urged in the central direction. That is, the movable guide 80 is urged toward the center. Therefore, the movable guide 80 firmly presses the first lock gear 21 to fix the first lock gear 21 and prevent rattling.

In the unlocked state, the central cam 30 rotates in the counterclockwise rotation direction. As a result, one end 51 of the urging member 50 moves in the counterclockwise direction, so that the urging direction of the other end 52 is changed from urging in the central direction to urging in the radial direction. As a result, the movable guide 80 moves in the radial direction, the pressing force on the first lock gear 21 is released, and the movable guide 80 can move in the central direction.

As shown in the above-described embodiment, it can be used as a reclining device for a vehicle seat.

10 ... base plate, 11 ... lock gear guide, 11a ... first lock gear guide, 11b ... second lock gear guide, 12 ... guide, 12a ... chamfer, 12b ... circumferential surface, 12d ... part, 12e ... Part, 13 ... Virtual surface, 14 ... 1st recess, 15 ... Load balance holding recess, 15d ... Load balance holding recess, 20 ... Lock gear, 21 ... 1st lock gear, 22 ... 2nd lock gear , 23 ... External teeth, 24 ... Lock gear recess, 24a ... Lock gear recess, 24b ... Rear end protrusion, 25 ... First protrusion, 26 ... Second protrusion, 30 ... Central cam, 31 ... Projection piece, 33 ... Central cam recess, 35 ... Shaft through hole, 36 ... Central cam protrusion, 37 ... Biasing member through hole, 40 ... Cam plate, 41 ... First cam hole, 42 ... Second cam hole, 43 ... Interference Prevention hole, 44 ... fitting hole, 45 ... insertion hole, 50 ... urging member, 51 ... one end, 52 ... other end, 60 ... gear plate, 61 ... internal tooth, 62 ... first protrusion support , 70 ... cover bracket, 80 ... movable guide, 90 ... operation shaft, 100 ... reclining device, 200 ... vehicle seat, 201 ... seat back, 202 ... seat back bracket, 203 ... seat cushion, 204 ... seat cushion bracket, 205 ... Operation lever

Claims (6)

A base plate in which a plurality of lock gear guide portions are formed by guide portions having a guide surface, and
A first lock gear having external teeth on the outer peripheral surface and slidably arranged on the lock gear guide portion,
A second lock gear having external teeth on the outer peripheral surface, movably arranged on the lock gear guide portion, and arranged at a different angle with respect to the first lock gear.
A gear plate having internal teeth that can be fitted with the external teeth of the first lock gear and the external teeth of the second lock gear.
A central cam that moves the first lock gear and the second lock gear so that they can be fitted with the internal teeth of the gear plate.
Of the guide surfaces, a concave load balance maintaining recess formed on at least one of the guide surfaces in contact with the second lock gear,
With
The load balance holding recess is on the outer peripheral surface side of the inner surface of the load balance holding recess, and the range within at least 1 mm from the guide surface excluding the chamfered portion is the circumferential surface of the guide portion. A reclining device characterized in that it is formed of a surface arranged on the same or outer peripheral side as a virtual surface having the same curvature as the above. In the reclining device according to claim 1,
Further, the urging member for urging the central cam and
A cam plate that is attached to the central cam and moves the first lock gear and the second lock gear in a direction opposite to the urging direction of the urging member.
A reclining device characterized by being equipped with. The reclining device according to claim 1 or 2, wherein a movable guide is provided between the first lock gear and the guide portion. The load balance holding recess is on the outer peripheral surface side of the inner surface of the load balance holding recess, and the circumferential surface of the guide portion is within a range of at least 3 mm from the guide surface except for the chamfered portion. The reclining device according to any one of claims 1 to 3, wherein the reclining device is formed of a surface that is the same as a virtual surface having the same curvature and is arranged on the outer peripheral side. Any of claims 1 to 4, wherein the first recess is formed on the guide surface in contact with the first lock gear and in the same circumferential direction as the load balance holding recess. The reclining device according to item 1. The first lock gear and the second lock gear are each composed of a pair of lock gears arranged so as to face each other with respect to the center.
The reclining device according to any one of claims 1 to 5, wherein the first lock gear and the second lock gear are arranged so as to be offset by 90 °.

Images