JP2012090746A - Reclining device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a reclining device not allowing release of a lock and having small impact force to a seated occupant, when a large impact load acts.SOLUTION: In this reclining device, each second cam 45 is disposed such that the second cam across two adjacent poles 41, 43, and has a guide part 45b passing through between the two poles 41, 43 and extending to the direction of internal teeth 23. The reclining device includes: second projection parts 37 each formed in a base plate 25 between the two adjacent poles 41, 43, and each facing to the other side face of one pole of the two adjacent poles 41, 43; and third projection parts 39 each formed in the base plate 25 between the two adjacent poles 41, 43, and each having a gap with the second projection part 37, and each facing to one side face of the other pole of the two adjacent poles 41, 43. The guide part 45b of the second cam 45 is disposed in the gap between the second projection part 37 and the third projection part 39.

Description

  The present invention includes a first member formed with internal teeth along a circumferential direction, a plurality of poles having external teeth meshable with the internal teeth, and relative rotation in the circumferential direction with the first member. The guide means guides each pole between a lock position where the outer teeth mesh with the inner teeth, and an outer position where the outer teeth are separated from the inner teeth. The formed second member, the first cam rotatable on the rotation shaft of the relative rotation, and when pressed by the first cam, the surface opposite to the surface provided with the external teeth of the pole is pressed. And moving the pole in a direction in which the outer teeth mesh with the inner teeth, and among the surfaces of the guide means on the clockwise side as viewed from the second member and the surfaces of the guide means on the counterclockwise side A second cam that moves the pole to one of the surfaces, and the pole By external teeth meshed with the internal teeth of the first member, it relates to a reclining device relative rotation between the first member and the second member is prohibited.

  An example of a conventional reclining device will be described with reference to FIGS. FIG. 10 is a structural view of a seat, and FIG. 11 is a sectional view of a conventional reclining device for a vehicle seat.

  As shown in FIG. 10, the seat 1 includes a seat cushion 2 that supports a seated person's buttocks, and a seat back 3 that is provided so as to be tiltable in the front-rear direction with respect to the seat cushion 2 and that supports the back part of the seated person. It has become. Reference numeral 4 denotes a reclining device that is provided on the rotation axis of the tilt of the seat back 3 and permits / inhibits the tilt of the seat back 3.

  As shown in FIG. 11, the reclining device includes a first member 7 in which inner teeth 7a are formed along the circumferential direction, and a second member provided so as to be rotatable relative to the first member 7 in the circumferential direction. Member 5. In this conventional example, the first member 7 is attached to the seat back 3 side, and the second member 5 is attached to the seat cushion 2 side.

  Between the first member 7 and the second member 5, two poles 10 having external teeth 10a that can mesh with the internal teeth 7a are arranged. The second member 5 is formed with guides 5a that guide the poles 10 in the radial direction with both side surfaces of the poles 10 interposed therebetween. Furthermore, between the first member 7 and the second member 5, a first cam 9 fixed to a shaft 8 that is rotatably supported on the central axis of the relative rotation is disposed.

  When the first cam 9 is pressed between the side portion of the pole 10 and the guide 5a, the surface of the pole 10 opposite to the surface on which the external teeth 10a are provided is pressed, and the external teeth 10a become the internal teeth 7a. The second cam 13 is arranged to move the pole 10 in the direction of meshing with the second member 5 and to move the pole 10 to the surface of the guide 5a on the counterclockwise side when viewed from the second member 5.

  A release plate 11 having a cam hole 11a is also fixed to the shaft 8. A protrusion 10b formed on the pole 10 is engaged with the cam hole 11a.

  Further, the external teeth 10 a are connected to the inner side of the first member 7 via the first cam 9 by a spring 15 whose inner end is locked to the second member 5 and whose outer end is locked to the first cam 9. The pole 10 is biased in the direction of meshing with the teeth 7a.

  Normally, the external teeth 10a mesh with the internal teeth 7a of the first member 7 through the first cam 9 and the second cam 13 by the biasing force of the spring 15 in each pole 10 provided on the second member 5. The relative rotation between the first member 7 and the second member 5 is prohibited, and the seat back 3 cannot rotate relative to the seat cushion 2 (locked state).

  When the shaft 7 is rotated against the urging force of the spring 13, the release plate 11 is rotated. Then, each pole 10 is guided to the cam hole 11a and moved to the unlocked position where the engagement between the outer teeth 10a and the inner teeth 7a is released, and the first member 7 and the second member 5 can be rotated relative to each other. Thus, the seat back 3 can rotate with respect to the seat cushion 2 (unlocked state).

  When the operating force to the shaft 7 is released, each pole 10 returns to the locked state by the biasing force of the spring 13.

Special table 2008-506481

  However, in the reclining device shown in FIG. 11, when a large impact load that relatively rotates the first member and the second member acts, for example, as shown in FIG. 11, the impact load in the arrow L direction is applied to each pole 10. When acting, this load is all transmitted to the guide 5a directly or via the second cam 13, and is transmitted to the floor of the vehicle.

  At this time, if the guide 5a is strong and the amount of deformation of the guide 5a is small, there is a problem that the impact force applied to the seated person is large.

  The present invention has been made in view of the above problems, and an object of the present invention is to provide a reclining device that is not unlocked when a large impact load is applied and has a small impact force on a seated person.

  The invention according to claim 1, which solves the problem, includes a first member in which inner teeth along a circumferential direction are formed, a plurality of poles having outer teeth that can mesh with the inner teeth, and the first member. Between the lock position where the outer teeth mesh with the inner teeth, and the outer teeth between the unlock positions where the outer teeth are separated from the inner teeth. A second member formed with guide means for guiding each pole, a first cam rotatable on the rotation shaft of the relative rotation, and an external tooth of the pole when pressed by the first cam. The surface opposite to the formed surface is pressed to move the pole in the direction in which the external teeth mesh with the internal teeth, and the surface of the guide means on the clockwise side as viewed from the second member, counterclockwise The pole is moved to one of the surfaces of the guide means on the direction side. A reclining device in which relative rotation between the first member and the second member is prohibited by engaging outer teeth of the pole with the inner teeth of the first member. The second cam is disposed so as to straddle the two adjacent poles, and has a guide portion that extends between the two poles toward the inner tooth direction, and between the two adjacent poles. A first guide formed on the second member and facing the other side of one of the two adjacent poles; and formed on the second member between the two adjacent poles; A second guide having a gap with the first guide and facing one side surface of the other of the two adjacent poles; and between the first guide and the second guide The guide of the second cam in the gap between A reclining apparatus characterized by but is disposed.

  According to a second aspect of the present invention, the guide means is formed on the first guide and the second member, and faces one side surface of one of the two adjacent poles, and the first guide A third guide for guiding one of the two adjacent poles in cooperation with the guide, the second guide, and the other of the two adjacent poles formed on the second member. And a fourth guide for guiding the other of the two adjacent poles in cooperation with the second guide and facing the other side of the pole. It is a reclining apparatus of description.

  According to the invention which concerns on Claim 1-2, the said 2nd cam is arrange | positioned so that the said adjacent two poles may be straddled, and the guide part extended toward the said internal-tooth direction through between the said two poles is provided. A first guide formed on the second member between the two adjacent poles and facing the other side surface of one of the two adjacent poles; and the two adjacent poles A second guide that is formed on the second member between the first guide and that has a gap between the first guide and that faces one side surface of the other of the two adjacent poles. When the guide portion of the second cam is disposed in the gap between the first guide and the second guide, a large impact load that relatively rotates the first member and the second member acts on the pole. First, the first guide and the second guide It is transmitted to one of the guides Chi.

  Since the first guide and the second guide are smaller and less rigid than the conventional guide, one of the guides is greatly deformed by the impact load, and the impact load is transmitted to the other guide through the guide portion of the second cam. And transmitted to the vehicle floor.

  The guide portion of the second cam is sandwiched and fixed between the first guide and the second guide and does not move. Therefore, the pole is held in a state where the outer teeth mesh with the inner teeth, and the lock is not released.

  And when one guide deform | transforms greatly, the energy of an impact load is absorbed and the impact force to a seated person becomes small.

It is a disassembled perspective view of the reclining apparatus of this embodiment. It is the perspective view seen from the arrow C direction at the time of attaching the reclining apparatus of FIG. It is the figure seen from the arrow C direction in the state which removed the outer periphery ring and ratchet at the time of attaching the reclining apparatus of FIG. In FIG. 3, it is sectional drawing in the cutting | disconnection line AA in the state which assembled | attached the outer periphery ring and the ratchet. In FIG. 3, it is sectional drawing in the cutting | disconnection line BB in the state which assembled | attached the outer periphery ring and the ratchet. It is the figure seen from the arrow D direction at the time of attaching the reclining apparatus of FIG. It is the figure seen from the arrow E direction at the time of attaching the reclining apparatus of FIG. It is a figure explaining the force which acts on a pole from the 2nd cam of FIG. It is a figure explaining the force which acts on a 2nd cam from the pole of FIG. It is a lineblock diagram of a sheet. It is sectional drawing of the reclining apparatus for the conventional seats of a vehicle.

  Next, embodiments of the present invention will be described with reference to the drawings.

  Similar to the reclining device 4 shown in FIG. 10, the glue climbing device according to the present embodiment is provided on the rotation axis of the tilt of the seat back 3.

  The reclining apparatus of this embodiment is demonstrated using FIGS. 1-7. 1 is an exploded perspective view of the reclining device of the present embodiment, FIG. 2 is a perspective view seen from the direction of arrow C when the reclining device of FIG. 1 is assembled, and FIG. 3 is an outer periphery when the reclining device of FIG. FIG. 4 is a view seen from the direction of arrow C with the ring and ratchet removed, FIG. 4 is a cross-sectional view taken along the line A-A in the state where the outer ring and ratchet are assembled, and FIG. 5 is FIG. FIG. 6 is a cross-sectional view taken along the line BB when the outer ring and the ratchet are assembled, FIG. 6 is a view seen from the direction of arrow D when the reclining device of FIG. 1 is assembled, and FIG. 7 is the reclining device of FIG. FIG. 8 illustrates the force acting on the pole from the second cam in FIG. 1, and FIG. 9 illustrates the force acting on the second cam from the pole in FIG. It is a figure to do.

  In FIG. 1, a ratchet (first member) 21 provided on the seat back side is formed by half-cutting a disk-like plate material by a press to form a circular recess 21a. Inner teeth 23 are formed in the entire circumferential direction on the inner circumferential surface of the circular recess 21a. A through hole 21b is formed at the center of the circular recess 21a.

  The base plate (second member) 25 provided on the seat cushion side is also formed by half-cutting a disk-shaped plate material by pressing to form a circular recess 25a. The diameter of the circular recess 25 a is set slightly larger than the outer diameter of the ratchet 21. And the ratchet 21 is engage | inserted by the circular recessed part 25a, and the baseplate 25 and the ratchet 21 can be rotated relatively. A through hole 25 b is formed in the center of the ratchet 21. The diameter of the hole 25b of the base plate 25 is set larger than the diameter of the hole 21a of the ratchet 21.

  The outer peripheral portion of the ratchet 21 and the outer peripheral portion of the base plate 25 are sandwiched by a ring-shaped outer peripheral ring 27, and the ratchet 21 and the base plate 25 are separated in the direction of the axis of relative rotation (O in FIG. 1). Without being relatively rotatable.

  In the space formed by the circular recess 21a of the ratchet 21 and the circular recess 25a of the base plate 25, the first cam 31 including the cam body 31c, the first shaft portion 31a, and the second shaft portion 31b is disposed. The first shaft portion 31 a is formed on one surface side of the cam body 31 c and is rotatably supported in the hole 21 a of the ratchet 21. The second shaft portion 31b is formed on one surface side of the first cam 31 so as to be coaxial with the first shaft portion 31a. In the present embodiment, the first shaft portion 31a and the second shaft portion 31b are oval cylinders having the same cross section.

  A release plate 33 is disposed between the first cam 31 and the circular recess 21 a of the ratchet 21. An oval hole 33a that is slightly larger than the cross-sectional shape of the first shaft portion 31a of the first cam 31 is formed at the center of the release plate 33. When the first shaft portion 31a of the first cam 31 is inserted into the hole 33a, the first cam 31 and the release plate 33 rotate together.

  As shown in FIGS. 1, 2, and 3, a total of four poles 41 and 43 are arranged along the circumferential direction between the release plate 33 and the circular recess 25 a of the base plate 25. Yes. Furthermore, as shown in FIG. 3, the pole 41 and the pole 43 have a symmetrical shape (axisymmetric shape) with respect to a line segment along the radial direction of the circumference.

  Outer teeth 41 a and 43 a that can mesh with the inner teeth 23 are formed on the surfaces of the poles 41 and 43 facing the inner teeth 23.

  In the circular recess 25a of the base plate 25, two first protrusions 35 protruding in the direction of the ratchet 21 are formed at intervals of 180 ° along the circumferential direction. Between the two first protrusions 35, two second protrusions 37 and two third protrusions 39 are formed at intervals of 180 ° along the circumferential direction. Both side portions of the first projecting portion 35 are guide surfaces 35a and 35b which are orthogonal to the bottom surface of the circular recess 25a of the base plate 25 and parallel to the radial direction of the circumference. Both side portions of the second projecting portion 37 are guide surfaces 37a and 37b which are orthogonal to the bottom surface of the circular concave portion 25a of the base plate 25 and parallel to the radial direction of the circumference. Both side portions of the third protrusion 39 are guide surfaces 39a and 39b which are orthogonal to the bottom surface of the circular recess 25a of the base plate 25 and parallel to the radial direction of the circumference.

  And the space | interval of the guide surface 35a of the 1st protrusion part 35 and the guide surface 39a of the 3rd protrusion part 39 is set a little wider than the width | variety of the pole 41, and the pole 41 is arrange | positioned between these two guide surfaces. Thus, the first protrusion 35 and the third protrusion 39 function as guide means for guiding the pole 41 in the radial direction of the circumference. Similarly, the guide surface 35b of the first projecting portion 35 and the guide surface 37a of the second projecting portion 37 are set slightly wider than the width of the pole 43, and the pole 43 is arranged between these two guide surfaces. Thus, the first protrusion 35 and the second protrusion 37 function as a guide for guiding the pole 43 in the radial direction of the circumference.

  In FIG. 2, when the counterclockwise direction is one direction and the clockwise direction is the other direction, the second projecting portion 37 is attached to the base plate (second member) 25 between the two adjacent poles 41 and 43. It is formed and functions as a first guide that faces the other side surface of the pole 43 that is one of the two adjacent poles 41 and 43.

  The third protrusion 39 is formed on the base plate (second member) 25 between the two adjacent poles 41 and 43, and has a gap with the second protrusion 37 as the first guide, It functions as a second guide that faces one side surface of the pole 41 that is the other of the two adjacent poles 41 and 43.

  One of the two first protrusions 35 functions as a third guide that cooperates with the second protrusion (first guide) 37 to guide the pole 43 in the radial direction of the circumference. .

  Furthermore, the other first protrusion 35 of the two first protrusions 35 cooperates with the third protrusion (second guide) 39 as a fourth guide for guiding the pole 43 in the circumferential radial direction. Function.

  A protrusion 41b that protrudes in the direction of the first cam 31 is formed on the first protrusion 35 side of the surface opposite to the surface on which the external teeth 41a of the pole 41 are formed (hereinafter referred to as the back surface). On the 39 side, a recess 41c is formed. A protrusion 43b protruding in the direction of the first cam 31 is formed on the first protrusion 35 side of the surface opposite to the surface on which the external teeth 43a of the pole 43 are formed (hereinafter referred to as the back surface). On the side of the two projecting portions 37, a recess 43c is formed.

  And the 2nd cam 45 is arrange | positioned so that the two adjacent poles 41 and 43 may be straddled via the 2nd protrusion part 37 and the 3rd protrusion part 39. FIG. The second cam 45 includes a main body portion 45 a that can contact the two poles 41 and 43, and a guide portion 45 b that extends toward the internal teeth 23 through a gap between the two poles 41 and 43. ing. On the other hand, the distance between the guide surface 37b of the second projecting portion 37 and the guide surface 39b of the third projecting portion 39 is set slightly larger than the width of the guide portion 45b of the second cam 45, and between these two guide surfaces. By arranging the guide portion 45b of the second cam 45, the second protrusion 37 and the third protrusion 39 function as a guide (second guide) for guiding the second cam 45 in the circumferential radial direction.

  Lock portions 45 d and 45 c that can come into contact with the recess 41 c of the pole 41 and the recess 43 c of the pole 43 are formed on the surface of the main body 45 a of the second cam 45 that faces the pole 41 and the pole 43.

  On the periphery of the cam main body 31c of the first cam 31, there are formed a pole 41, a protrusion 41b formed on the back surface of the pole 43, and four pole protrusions 31d with which the protrusion 43b can abut. Further, when the first cam 31 rotates in one direction on the peripheral portion of the cam body 31c of the first cam 31, the side opposite to the surface on which the lock portions 45c and 45d of the body portion 45a of the second cam 45 are formed. The second cam projection 31e that pushes the pole 41 and the pole 43 in the direction in which the outer teeth 41a and the outer teeth 43a mesh with the inner teeth 23 of the ratchet 21 is formed.

  In the present embodiment, as shown in FIG. 8, the surface of the concave portion 43c of the pole 43 with which the lock portion 45c of the second cam 45 abuts is pressed against the external teeth 43a when the lock portion 45c of the second cam 45 is pressed. Is a slope that generates a force F composed of a component force F1 that drives the pole 43 in a direction to mesh with the internal teeth 23 of the ratchet 21 and a component force F2 that pushes the pole 43 toward the first protrusion 35. Yes.

  Similarly, the surface of the recess 41c of the pole 41 with which the lock portion 45d of the second cam 45 abuts is the direction in which the external teeth 41a mesh with the internal teeth 23 of the ratchet 21 when the lock portion 45d of the second cam 45 is pressed against it. The slope is such that a force is generated which includes a component force for driving the pole 41 and a component force for pushing the pole 41 toward the first protrusion 35.

  That is, of the pressing contact between the second cam 45 and the poles 41, 43, the pressing contact between the second cam 45 and the pole 41 is performed by the first guide 35 on the clockwise side when viewed from the base plate (second member) 25. The pole 41 is moved to the surface 35 a, and the other pressing contact between the second cam 45 and the pole 43 is the surface 35 b of the first guide 35 on the counterclockwise side when viewed from the base plate (second member) 25. The pole 43 is moved.

  The outer end of the hole 25b of the base plate 25 is locked to one of the two grooves 25c extending in the radial direction formed on the wall peripheral surface of the hole 25b, and the inner end is the first end. A spiral spring 47 wound around a second shaft portion 31b having a cross-sectional shape of the cam 31 is disposed. Due to the biasing force of the spiral spring 47, the first cam 31 is biased in a direction in which the outer teeth 41 a and the outer teeth 43 a of the pole 41 and the pole 43 mesh with the inner teeth 23 of the ratchet 21.

  The pole 41, the pole 43, and the second cam 45 are formed with a protrusion 41d, a protrusion 43d, and a protrusion 45e that protrude in the direction of the release plate 33, respectively. On the other hand, the projection 41d of the pole 41, the projection 43d of the pole 43, and the projection 45e of the second cam 45 are engaged with the release plate 33 and rotated, whereby the pole 41, the pole 43, and the second cam 45 are rotated. A cam hole 33b and a cam hole 33c are formed. When the first cam 31 (release plate 33) is rotated in the other direction, the cam holes 33b and 33c are arranged so that the external teeth 41a and the external teeth 43a are separated from the internal teeth 23 of the ratchet 21. The second cam 45 is formed in a shape that pulls up.

  On the inner wall surface of the ratchet 21 on the bottom surface side of the circular recess 21a from the inner teeth 23, a pair of protrusions 51 are formed that protrude toward the center of the circumference along the circumferential direction. The second cam 45 is formed with a protrusion 45 f that can ride on the top of the protrusion 51. When the protrusion 45f of the second cam 45 rides on, the protruding amount of the protruding portion 51 is set to an amount that holds the pole 41 and the pole 43 at a position where the outer teeth 41a and the outer teeth 43a are separated from the inner teeth 23 of the ratchet 21. ing. When the protrusion 45f of the second cam 45 rides on the protrusion 51, the first cam 31 rotates in one direction (the pole 41, the external teeth 41a of the pole 43, and the external teeth 43a on the internal teeth 23 of the ratchet 21). (Rotation in the meshing direction) is prohibited, and the ratchet 21 and the base plate 25 can be rotated relative to each other without operating the first cam 31.

  As shown in FIG. 9, in the present embodiment, when the ratchet 21 and the base plate 25 are relatively rotated while the outer teeth 43 a of the pole 43 are engaged with the inner teeth 23 of the ratchet 21, The force F3 acting on the cam 45 is directed toward the contact portion T between the second cam projection 31e of the first cam 31 and the second cam 45.

  Similarly, when the ratchet 21 and the base plate 25 are rotated relative to each other while the outer teeth 41a of the pole 41 are engaged with the inner teeth 23 of the ratchet 21, the force acting on the second cam 45 from the pole 41 is the first cam. The second cam projection 31e of 31 and the second cam 45 are in contact with each other.

  Next, the operation of the above configuration will be described.

  Usually, the outer teeth 41a of the pole 41 on the base plate 25 side and the outer teeth 43a of the pole 43 mesh with the inner teeth 23 of the ratchet 21 via the first cam 31 and the second cam 45 by the biasing force of the spiral spring 47. In the position, the relative rotation between the ratchet 21 and the base plate 25 is prohibited, and the seat back is in a state where it cannot rotate relative to the seat cushion (locked state).

  When the first cam 31 is operated against the biasing force of the spring 47 and rotated in the other direction, the release plate 33 that rotates together with the first cam 31 rotates, and the external teeth 41a and the external teeth 43a are ratchet. The pole 41, the pole 43, and the second cam 45 are pulled up in a direction away from the internal teeth 23 of the 21. The pole 41, the pole 43, and the second cam 45 are connected to the external teeth 41a, the external teeth 43a, and the internal teeth 23 of the ratchet 21. Accordingly, the ratchet 21 and the base plate 25 can rotate relative to each other, and the seat back 3 can rotate relative to the seat cushion 2.

  When the protrusion 45f of the second cam 45 rides on the protrusion 51, the ratchet 21 and the base plate 25 can be rotated relative to each other without operating the first cam 31.

  When the operating force on the first cam 31 is released, the urging force of the spiral spring 47 causes the pole 41 provided on the base plate 25, the external teeth 43a of the pole 43, and the external teeth 43a to mesh with the internal teeth 23 of the ratchet 21. The relative rotation between the ratchet 21 and the base plate 25 is prohibited and the locked state is established again.

  According to the above configuration, the second cam 45 is disposed so as to straddle the adjacent two poles 41 and 43, and extends between the two poles 41 and the pole 43 toward the inner teeth 23. And is formed on the base plate (second member) 25 between the two adjacent poles 41 and 43 and faces the other side surface of one of the two adjacent poles 41 and 43. The second protrusion (first guide) 37 is formed on the base plate 25 between the two adjacent poles 41 and 43, and there is a gap between the second protrusion 37 and the two adjacent poles 41. , A third protrusion (second guide) 39 facing one side surface of the other pole 43 of the poles 43 is provided, and the second protrusion 37 and the third protrusion 39 have a second gap in the gap between them. Cam 45 guy Part 45b is disposed. Therefore, as shown in FIG. 3, when a large impact load M that relatively rotates the ratchet 21 and the base plate 25 acts on the pole 43, first, it is transmitted to the second protrusion (first guide) 37. Since the second protrusion (first guide) and the third protrusion (second guide) 39 are smaller and less rigid than the conventional guide, the second protrusion 37 is greatly deformed by the impact load, and the second The impact load is transmitted to the third projecting portion (second guide) 39, which is the other guide, via the guide portion 45b of the cam 45, and is transmitted to the floor of the vehicle.

  The guide portion 45b of the second cam 45 is sandwiched between the second protrusion 37 and the third protrusion 39, is fixed, and does not move. Therefore, the pole 43 is held in a state where the outer teeth 43a mesh with the inner teeth 23, and the lock is not released.

  And when the 2nd protrusion part 37 deform | transforms greatly, the energy of an impact load is absorbed and the impact force to a seated person becomes small.

  The present invention is not limited to the above embodiment. In the above embodiment, the ratchet 21 is provided on the seat back side and the base plate 25 is provided on the seat cushion side. However, the ratchet 21 may be provided on the seat cushion side and the base plate 25 may be provided on the seat back side.

21 Ratchet (first member)
25 Base plate (second member)
31 1st cam 35,37 1st guide 35,39 1st guide 41,43 Pole 41a, 43a External tooth 45 2nd cam

Claims (2)

A first member formed with internal teeth along the circumferential direction;
A plurality of poles having external teeth meshable with the internal teeth;
A lock position that is provided so as to be rotatable relative to the first member in the circumferential direction, sandwiches both side surfaces of each pole, and the outer teeth engage with the inner teeth, and the outer teeth are separated from the inner teeth. A second member formed with guide means for guiding each of the poles between locked positions;
A first cam rotatable on the rotation shaft of the relative rotation;
When pressed by the first cam, the surface of the pole opposite to the surface on which the external teeth are provided is pressed to move the pole in a direction in which the external teeth mesh with the internal teeth, and the second cam A second cam for moving the pole to one of the surface of the guide means on the clockwise side when viewed from the member and the surface of the guide means on the counterclockwise side;
Have
In the reclining device in which relative rotation between the first member and the second member is prohibited by engaging the outer teeth of the pole with the inner teeth of the first member,
The second cam is disposed so as to straddle the two adjacent poles, and has a guide portion that extends between the two poles and extends toward the inner tooth direction,
A first guide formed on the second member between the two adjacent poles and facing the other side surface of one of the two adjacent poles;
A second member is formed on the second member between the two adjacent poles, has a gap with the first guide, and faces a side surface of the other of the two adjacent poles. 2 guides,
Provided,
A reclining device, wherein a guide portion of the second cam is disposed in a gap between the first guide and the second guide. The guide means includes
The first guide;
The second member is formed on the second member, faces one side surface of one of the two adjacent poles, and cooperates with the first guide to form one of the two adjacent poles. A third guide to guide,
The second guide;
The second member is formed on the second member, is opposed to the other side surface of the other two poles of the two adjacent poles, and cooperates with the second guide to fix the other pole of the two adjacent poles. A fourth guide to guide,
The reclining device according to claim 1, comprising:

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