JP5817436B2 - Reclining device - Google Patents

Description

  The present invention relates to a reclining device that adjusts the tilt angle between a first member and a second member that are relatively tilted.

  Conventionally, a reclining device disclosed in Patent Document 1 below is known as a reclining device that adjusts the tilt angle between a relatively tilted first member and a second member. In this reclining device, slidable movable guides are interposed between the lock gear and the fixed guide, respectively, and these movable guides are formed so that the width gradually decreases from the outer end toward the inner end. Of the sliding surfaces of the movable guide, the sliding surface on the lock gear side is provided in parallel to the moving direction of the lock gear. Each movable guide is engaged with a lock spring, and is urged radially inward of the base plate by the lock spring.

  For this reason, since the movable guide is always in the state of being caught between the lock gear and the fixed guide, the fixed guide, the lock gear, and the movable guide are in close contact with each other, and the gap between the members disappears. It becomes. As a result, the backlash in the front-rear direction of the seat back is surely eliminated, and a reliable lock and release thereof are possible.

Japanese Patent No. 4305571

  By the way, since the movable guide is urged radially inward (inward) by an urging member such as a lock spring, when the lock is released, the movable guide is urged against the urging force of the urging member in the radial direction. It is necessary to displace outward (outward). For this reason, when the urging force of the urging member is increased, there is a problem that an operation force necessary for unlocking is increased and operability is deteriorated. In order to solve this problem, when a biasing member with a weak biasing force is employed, the movable guide is biased at one end of the biasing member and another member is biased at the other end. Causes a problem that a necessary urging force cannot be secured for the separate member.

  The present invention has been made to solve the above-described problems, and an object of the present invention is to move the movable guide when unlocking without reducing the biasing force of the biasing member itself for biasing the movable guide. It is in providing the reclining apparatus which can reduce the urging | biasing force which acts on this.

In order to achieve the above object, the reclining device according to claim 1 according to the claims includes a tilt angle between the first member (11, 11a) and the second member (12, 12a) which are relatively tilted. A base plate (30) attached to the first member and an internal tooth attached to the second member and rotatably mounted on the base plate. (41) and a gear plate (40) and a guide surface (33a) of a pair of guide surfaces formed on the base plate, and are slidably guided in the radial direction and assembled. A lock gear (61) having external teeth (61a) that can mesh with internal teeth, and the other guide surface (33b) of the pair of guide surfaces and the lock gear are in contact with each other. A movable guide (63) disposed so as to be urged inward in the radial direction of the base plate and gradually narrowing from the outer end toward the inner end; and the radius of the lock gear and the movable guide The direction of movement can be controlled, and a cam (70) that is urged to rotate in a direction that meshes the outer teeth with the inner teeth, and a biasing member (80) that urges the movable guide inward in the radial direction. And an operating member (23) for releasing the meshing between the external teeth and the internal teeth by moving the movable guide radially outward by rotating the cam against the rotational bias. The other guide surface and the opposing surface of the movable guide that opposes the other guide surface constitute an engaged portion (65) that engages with an engagement end portion of the biasing member. recess (35,64) are respectively formed, the movable The concave portion of the id is formed such that a biasing surface (64a) that receives a biasing force from the engagement end portion is inclined inward in the radial direction toward the other guide surface side, and the concave portion of the other guide surface is formed. The urging surface (35a) that receives the urging force from the engagement end portion is formed to be inclined inward in the radial direction toward the movable guide, and the degree of inclination is the inclination in the concave portion of the movable guide. are the same, the engaging end, cross-section and wherein Rukoto is formed in a circular shape.

  According to a second aspect of the present invention, in the reclining device according to the first aspect, the urging member urges the movable guide inward in the radial direction and the outer teeth mesh with the inner teeth. The cam is rotationally biased.

In addition , the code | symbol in each said bracket | parenthesis shows the corresponding relationship with the specific means as described in each embodiment mentioned later.

According to the first aspect of the present invention, the movable guide contacts both the other guide surface and the lock gear of the pair of guide surfaces formed on the base plate, and is urged radially inward of the base plate by the urging member. Is arranged. And the recessed part which comprises the to-be-engaged part with which the engaging edge part of an urging member engages is formed in the other guide surface and the opposing surface of the movable guide which opposes this other guide surface, respectively , and is movable. The concave portion of the guide is formed such that a biasing surface that receives a biasing force from the engagement end portion is inclined inward in the radial direction toward the other guide surface side, and the concave portion of the other guide surface is biased from the engagement end portion. The urging surface for receiving is formed to be inclined inward in the radial direction toward the movable guide, and the degree of inclination is the same as the inclination in the concave portion of the movable guide, and the engagement end portion has a circular cross section. The

For this reason, the movable guide is operated by operating the operating member to release the lock by releasing the meshing between the external teeth of the lock gear and the internal teeth of the gear plate, and the cam is rotated against the rotational bias. When moving outward in the radial direction, the urging force via the engagement end portion acts in a distributed manner on both the concave portion of the movable guide and the concave portion of the other guide surface. As a result, the urging force acting on the movable guide via the engagement end portion is reduced, so that the operating force of the operating member necessary for moving the movable guide radially outward against the urging force is reduced. be able to. On the other hand, since the urging force of the urging member itself does not change, the necessary urging force is ensured for the other member even in a configuration in which the urging member is urged at an end different from the engaging end of the urging member. can do.
Therefore, it is possible to reduce the urging force acting on the movable guide at the time of unlocking without reducing the urging force of the urging member itself for urging the movable guide.
Further, the concave portion of the movable guide is formed such that the biasing surface that receives the biasing force from the engagement end portion is inclined inward in the radial direction toward the other guide surface side, so that when the movable guide moves radially outward, The engaging end pressed against the urging surface moves along the urging surface toward the concave portion of the other guide surface. As a result, the biasing force via the engaging end portion acts more largely on the concave portion of the other guide surface than on the concave portion of the movable guide, so that the movable guide moves radially outward against the biasing force. The operating force of the required operating member can be further reduced.

  In the invention of claim 2, the urging member urges the movable guide inward in the radial direction and urges the cam in a direction in which the external teeth mesh with the internal teeth. The urging force acting on the movable guide when unlocking can be reduced while securing the urging force.

It is a side view showing the composition outline of the vehicular seat where the reclining device concerning this embodiment is installed. It is sectional drawing of a reclining apparatus. It is sectional drawing by the cut surface equivalent to the 3-3 line shown in FIG. It is sectional drawing by the cut surface equivalent to the 4-4 line shown in FIG. It is explanatory drawing which shows the engagement state of a to-be-engaged part and the one side edge part of a spring member, FIG. 5 (A) shows the time of a locked state, and FIG. 5 (B) shows the time of unlocking.

Hereinafter, an embodiment of a reclining device according to the present invention will be described with reference to the drawings. FIG. 1 is a side view showing a schematic configuration of a vehicle seat 10 on which a reclining device 20 according to the present embodiment is installed.
As is well known, the vehicle seat 10 includes a seat cushion 11 and a seat back 12 as main components. The seat cushion 11 includes a seat bracket (lower bracket) 11a, and the seat back 12 includes a seat back bracket (upper side). Brackets) 12a are fixed.

  The lower bracket 11a and the upper bracket 12a are coupled to each other so as to be relatively rotatable by being fixed to the relatively rotating portions of the round reclining unit 21, respectively. Thereby, the tilt angle of the seat back 12 with respect to the seat cushion 11 can be adjusted. The seat cushion 11 and the lower bracket 11a correspond to an example of a “first member” described in the claims, and the seat back 12 and the upper bracket 12a include the “second member” described in the claims. It may correspond to an example of “members”.

  A reclining operation lever 23 is attached to the center shaft 22 at the center of the round reclining unit 21. A reclining device 20 is constituted by the round reclining unit 21, the center shaft 22 and the reclining operation lever 23. When the reclining operation lever 23 is pulled upward, the reclining device 20 is unlocked and the tilt angle of the seat back 12 can be adjusted. Here, the range of the angle A shown in FIG. 1 in which the seat back 12 is tilted backward is an inclination adjustment range in which the seat back 12 is locked at the angle position when the finger is released from the reclining operation lever 23. The range of angle B shown in FIG. 1 in which the back 12 is tilted forward is a free rotation range corresponding to a lock-free state in which the unlocked state continues even if the finger is released from the reclining operation lever 23. As can be seen from FIG. 1, the seat back 12 can be rotated from a forwardly tilted position in contact with the seat cushion 11 to a backwardly tilted position that becomes flat with the seat cushion 11. The structure of such a reclining device 20 will be described below.

  FIG. 2 is a cross-sectional view of the reclining device 20. FIG. 3 is a cross-sectional view taken along the line 3-3 shown in FIG. 4 is a cross-sectional view taken along the line 4-4 shown in FIG. FIG. 5 is an explanatory view showing an engaged state between the engaged portion 65 and the one end 81 of the spring member 80, FIG. 5 (A) shows a locked state, and FIG. Indicates when the lock is released. In FIG. 2, the following description will be made with the left side of the drawing as one side in the axial direction and the right side of the drawing as the other side in the axial direction. 2, the center shaft 22 and the reclining operation lever 23 are not shown for convenience, and the gear plate 40 is shown only in the vicinity of the internal teeth 41 in FIG.

  As shown in FIG. 2, the round reclining unit 21 is configured so that the base plate 30 and the gear plate 40 are rotated relative to each other by assembling the cover bracket 50 by superimposing the substantially disc-shaped base plate 30 and the substantially bowl-shaped gear plate 40. It is configured to be held as possible and to prevent relative movement in the axial direction.

  A cavity (space) C is formed between the base plate 30 and the gear plate 40. In the cavity C, as shown in FIGS. 2 to 4, a total of four lock gears including a pair of first lock gears 61 and a pair of second lock gears 62, two movable guides 63, a central cam 70, A member for locking and unlocking such as a substantially arc-shaped spring member 80 and a substantially disc-shaped cam lever 90 is provided.

  The base plate 30 has a plurality of projections 30b formed on a side surface (hereinafter also referred to as a mounting surface 30a) on one side in the axial direction, and engages each projection 30b with an engagement hole (not shown) of the lower bracket 11a. By attaching it, it attaches to the said lower bracket 11a. As shown in FIG. 3, the base plate 30 is formed with four guide protrusions 31, 32, 31, 32 for guiding the lock gears 61, 62 in the radial direction on the side surface on the other side in the axial direction. ing.

  Here, as shown in FIG. 3, of the pair of guide surfaces for guiding the first lock gear 61, the guide surface of the guide convex portion 31 is one first guide surface 33 a, and the guide surface of the guide convex portion 32. Is the other first guide surface 33b. Of the pair of guide surfaces for guiding the second lock gear 62, the guide surface of the guide convex portion 32 is one second guide surface 34a, and the guide surface of the guide convex portion 31 is the other second guide surface 34b. And Of each guide surface, the other first guide surface 33b is formed with a recess 35 at the center in the longitudinal direction. The detailed shape of the recess 35 will be described later. One first guide surface 33a and the other first guide surface 33b may correspond to an example of “one guide surface” and “the other guide surface” recited in the claims.

  Inner teeth 41 are formed on the inner peripheral surface of the annular outer edge of the gear plate 40 over the entire periphery. The gear plate 40 has a plurality of protrusions (not shown) formed on the back surface (the surface on the other side in the axial direction), and engages each protrusion protrusion with an engagement hole (not shown) of the upper bracket 12a. And attached to the upper bracket 12a.

  As shown in FIG. 3, external teeth 61 a and 62 a that can mesh with the internal teeth 41 of the gear plate 40 are formed on the outer peripheral sides of the first lock gear 61 and the second lock gear 62. In addition, the lock gears 61 and 62 are respectively formed with protrusions 61b and 62b that protrude from the approximate center of the other surface in the axial direction to the other side in the axial direction. Both the first lock gears 61 are guided by the first guide surface 33a of the guide convex portion 31 and the movable guide 63 guided by the other first guide surface 33b of the guide convex portion 32, and slide only in the radial direction. Each is supported freely. Further, both the second lock gears 62 are supported by one second guide surface 34a of the guide convex portion 32 and the other second guide surface 34b of the guide convex portion 31 so as to be slidable only in the radial direction. ing.

  Both movable guides 63 are formed in a wedge shape so that the width gradually decreases from one end toward the other end, and can contact both the first lock gear 61 and the other first guide surface 33b of the guide protrusion 32. Respectively. Each of these movable guides 63 is formed with a protrusion 63a that protrudes in a substantially cylindrical shape from the vicinity of the outer edge of the other surface in the axial direction to the other side in the axial direction.

  Further, in both movable guides 63, concave portions 64 are respectively formed on the opposing surfaces of the other first guide surface 33b facing the concave portion 35 in the locked state. The recessed portion 64 and the recessed portion 35 constitute an engaged portion 65, and the one end 81 of the spring member 80 is engaged with the engaged portion 65.

  For this reason, as shown in FIG. 5A, the urging force F via the one side end 81 is applied to the urging force F1 of the movable guide 63 against the recess 64 and the urging force of the other first guide surface 33b against the recess 35. The urging force F <b> 1 of the two urging forces acts so as to urge the movable guide 63 inward (inward) in the radial direction of the base plate 30.

  Then, in accordance with the urging force F1, the movable guides 63 are always in a state of being bitten between the first lock gear 61 and the other first guide surface 33b, respectively, and the first lock gear 61 and the other first guide. The surface 33b and the movable guide 63 are brought into close contact with each other (tightly joined together), and the gap between the members disappears. Therefore, the backlash in the front-rear direction of the seat back 12 is eliminated.

  In particular, the concave portion 64 of the movable guide 63 is formed such that an urging surface 64a that receives the urging force F1 is inclined inward in the radial direction toward the other first guide surface 33b (angle θ1 in FIG. 5A). reference). Further, the concave portion 35 of the other first guide surface 33b is formed such that the biasing surface 35a that receives the biasing force F2 is inclined inward in the radial direction toward the movable guide 63 side (angle θ2 in FIG. 5A). reference). The recessed portion 64 and the recessed portion 35 correspond to an example of a “recessed portion” described in the claims, and the engaged portion 65 corresponds to an example of an “engaged portion” described in the claims. obtain. Further, the urging surface 64a corresponds to an example of an “urging surface” recited in the claims, and the one side end portion 81 corresponds to an example of an “engaging end portion” recited in the claims. Can do.

  A plate-like cam 70 having a through hole 71 formed in the center is rotatably disposed at the center of the base plate 30. The cam 70 has a cam surface 72 that abuts against the rear end surface of each of the lock gears 61 and 62 on the outer peripheral surface, and two engagement holes 73 that engage with the other end 82 of the spring member 80 on the side surface and the axial direction. Two columnar protrusions 74 protruding to the other side are formed.

  As shown in FIG. 4, the cam 70 is strongly biased in the lock rotation direction (counterclockwise in FIGS. 3 and 4) by engaging with the other end portions 82 of the two spring members 80, respectively. Has been. As a result, the cam 70 abuts against the rear end surfaces of the lock gears 61 and 62 at the cam surface 72, thereby urging the lock gears 61 and 62 radially outward by the biasing force in the lock rotation direction by the spring members 80. It will be strongly biased outward.

  The center shaft 22 is inserted into the through hole 71 of the cam 70, and the cam 70 is unlocked in the direction of unlocking against the urging force of the two spring members 80 by rotating the center shaft 22 (see FIGS. 3 and 3). 4 (clockwise at 4).

  As shown in FIG. 4, the cam lever 90 is provided with a through hole 91 that fits into both the projections 74 of the cam 70 and two cam holes 92 to 94, respectively, and with respect to the projection 63 a of the movable guide 63. Thus, two cam surfaces 95 that contact from the inside in the radial direction and urge (press) the outside in the radial direction when rotating in the unlocking rotation direction are provided on the outer peripheral edge. The cam lever 90 is fitted with the through holes 91 and the protrusions 74, the protrusions 61b are inserted into the cam holes 92, and the protrusions 62b are inserted into the cam holes 93, respectively. The lock gears 61 and 62 are assembled. As a result, the cam lever 90 is assembled to the cam 70 so as to rotate according to the rotation of the cam 70. The one end portion 81 of the spring member 80 is engaged with the engaged portion 65 exposed from each of the cam holes 94.

  As a result, when the cam lever 90 rotates together with the cam 70 in the unlock rotation direction, the inner peripheral edge of the cam hole 92 abuts against the protrusion 61b of the first lock gear 61, and the inner peripheral edge of the cam hole 93 corresponds to both the second lock gears 62. Each of the projections 62b comes into contact with each other. When the cam lever 90 further rotates in the unlocking rotation direction, the two protrusions 63a are urged by the cam surfaces 95, respectively, so that the two movable guides 63 are moved outward in the radial direction, respectively. The locked state of the lock gear 61 is released, and both the first lock gears 61 are movable in the radial direction. The protrusions 61b and 62b are urged radially inward by the inner peripheral edges of the cam holes 92 and 93, and the lock gears 61 and 62 move in conjunction with the radially inner side.

  The reclining device 20 configured as described above has a base bracket 30 in which the lock gears 61 and 62, the movable guide 63, the cam 70, and the like are disposed in the cavity C and are integrally assembled. 50 is integrated by ring caulking. As a result, the base plate 30 and the gear plate 40 are held so as to be relatively rotatable and the relative movement in the axial direction is suppressed.

  And the reclining operation lever 23 is assembled | attached with respect to the center shaft 22 inserted in the through-hole 71 of the cam 70, and the reclining apparatus 20 shown in FIG. 2 is completed. In the reclining device 20 configured as described above, the protrusions 30b of the base plate 30 are engaged with the engagement holes of the lower bracket 11a, and the protrusions of the gear plate 40 are engaged with the engagement holes of the upper bracket 12a. By combining, the seat cushion 11 and the seat back 12 are connected by the reclining device 20 so as to be capable of relative tilting. The base plate 30 may be attached to the upper bracket 12a and the gear plate 40 may be attached to the lower bracket 11a.

An unlocked state and a locked state of the reclining device 20 according to this embodiment configured as described above will be described below.
(Unlocked)
First, the unlocked state in the reclining device 20 will be described.
When the occupant releases the lock to adjust the tilt angle of the seat back 12, the reclining operation lever 23 is operated to rotate the center shaft 22 in the unlocking rotation direction. Then, according to this operating force, the cam 70 and the cam lever 90 rotate in the unlock rotation direction against the urging force of both spring members 80 together with the center shaft 22.

  When the cam 70 rotates in the unlocking rotation direction, the contact between the cam surface 72 of the cam 70 and the rear end surfaces of the lock gears 61 and 62 is released, and the lock gears 61 and 62 are moved radially outward. The urging force by the cam 70 that is urging is released. As a result, the lock gears 61 and 62 can move inward in the radial direction, and the engagement between the inner teeth 41 of the gear plate 40 and the outer teeth 61a and 62a of the lock gears 61 and 62 can be released.

  Further, as the cam lever 90 rotates in the unlock rotation direction, the protrusion 63a of the movable guide 63 is urged by the cam surface 95 and moves outward in the radial direction. At this time, the movable guide 63 moves radially outward against the urging force F <b> 1 acting by the one end 81 of the spring member 80 engaged with the recess 64. That is, in order to move the movable guide 63 radially outward against the biasing force F1 of the spring member 80, an operation force F3 corresponding to the operation of the operation lever 23 shown in FIG. .

The operating force F3 will be described in detail with reference to FIG.
In the locked state, as shown in FIG. 5A, the urging force F of the spring member 80 is applied to the urging force F1 of the movable guide 63 against the urging surface 64a and the urging surface 35a of the other first guide surface 33b. The urging force F2 acts in a distributed manner. When the operating force F3 is applied to the movable guide 63, the movable guide 63 moves outward in the radial direction against the urging force F1 acting via the one end 81. At this time, the force required as the operating force F3 is a force corresponding to the urging force F1 acting in a distributed manner, so that the urging force F of the spring member 80 is all applied to the movable guide 63 without being dispersed. Thus, the operating force F3 for moving the movable guide 63 outward in the radial direction can be reduced.

  In particular, the urging surface 64a on which the urging force F1 acts is formed so as to be inclined inward in the radial direction toward the other first guide surface 33b (see the angle θ1 in FIG. 5A). Is moved outward in the radial direction, the one side end portion 81 pressed against the urging surface 64a moves along the urging surface 64a to the concave portion 35 side of the other first guide surface 33b. As a result, the biasing force F1 via the one side end portion 81 acts on the concave portion 35 of the other first guide surface 33b more than the concave portion 64 of the movable guide 63, so that the movable guide 63 resists the biasing force F1. As a result, the operating force F3 required to move outward in the radial direction can be further reduced.

  As described above, when the movable guides 63 move outward in the radial direction so that the engagement state of the first lock gear 61 by the movable guides 63 is released, the lock gears 61 move inward in the radial direction. Is possible. Then, when the cam lever 90 further rotates in the unlock rotation direction together with the cam 70, the inner peripheral edges of the cam holes 92 and 93 of the cam lever 90 come into contact with the protrusions 61b and 62b of the lock gears 61 and 62, respectively. By positively moving the lock gears 61 and 62 radially inward, the meshing between the inner teeth 41 and the outer teeth 61a and 62a is released.

  As described above, when the meshing between the inner teeth 41 and the outer teeth 61a and 62a is released, the rotation of the gear plate 40 becomes free and the round reclining unit 21 is unlocked. When the round reclining unit 21 is unlocked, the reclining device 20 is unlocked, and when the seat back 12 is tilted backward, the tilt angle of the seat back 12 can be freely adjusted ( (See angle A in FIG. 1).

(Locked state)
Next, the locked state in the reclining device 20 will be described.
When the adjustment of the inclination angle of the seat back 12 by the occupant is finished, the reclining operation lever 23 is loosened, so that the cam 70 and the cam lever 90 are rotated in the lock rotation direction by the urging force of both spring members 80.

  When the cam surface 72 of the rotating cam 70 comes into contact with the rear end surfaces of the lock gears 61 and 62, the lock gears 61 and 62 are urged radially outward. Accordingly, the outer teeth 61 a and 62 a of the lock gears 61 and 62 move radially outward so as to mesh with the inner teeth 41 of the gear plate 40. Further, by releasing the contact between the cam surface 95 of the rotating cam lever 90 and the protrusions 63a of both movable guides 63, the biasing force of the spring member 80 acting on the recess 64 via the one side end 81 is provided. As a result, both movable guides 63 move radially inward.

  Then, the outer teeth 61a and 62a of the lock gears 61 and 62 mesh with the inner teeth 41 of the gear plate 40, and both movable guides 63 bite between the first lock gear 61 and the other first guide surface 33b. By being in the tight state, the rotation of the gear plate 40 is limited, and the reclining device 20 is in the locked state.

  As described above, in the reclining device 20 according to the present embodiment, the movable guide 63 contacts both the first guide surface 33 b and the first lock gear 61 of the other of the pair of guide surfaces formed on the base plate 30. The spring member 80 is arranged so as to be urged radially inward of the base plate 30. Then, an engaged portion 65 with which one end portion 81 of the spring member 80 is engaged is formed between the other first guide surface 33b and the opposite surface of the movable guide 63 facing the other first guide surface 33b. Constructing recesses 35 and 64 are formed, respectively.

For this reason, the reclining operation lever 23 is operated to release the lock by releasing the engagement between the external teeth 61a, 62a of the lock gears 61, 62 and the internal teeth 41 of the gear plate 40, and the cam 70 is urged to rotate. When the movable guide 63 moves radially outward by being driven against rotation, the urging force via the one side end portion 81 causes the concave portion 64 of the movable guide 63 and the concave portion 35 of the other first guide surface 33b. Will act in a distributed manner. As a result, the urging force acting on the movable guide 63 via the one side end portion 81 is reduced, so that the reclining operation lever 23 required to move the movable guide 63 radially outward against the urging force is provided. The operating force can be reduced. On the other hand, since the biasing force of the spring member 80 itself does not change, the configuration in which the cam 70 is rotationally biased by the other end 82 different from the one end 81 of the spring member 80 is necessary for the cam 70. Can be secured.
Therefore, the urging force acting on the movable guide 63 when unlocking can be reduced without reducing the urging force of the spring member 80 itself for urging the movable guide 63.

  In particular, the concave portion 64 of the movable guide 63 is formed such that the urging surface 64a that receives the urging force from the one end portion 81 of the spring member 80 is inclined inward in the radial direction toward the other first guide surface 33b. When the movable guide 63 moves outward in the radial direction, the one side end portion 81 pressed against the biasing surface 64a moves along the biasing surface 64a to the concave portion 35 side of the other first guide surface 33b. As a result, the biasing force via the one side end portion 81 acts more greatly on the concave portion 35 of the other first guide surface 33b than on the concave portion 64 of the movable guide 63, so that the movable guide 63 resists the biasing force. It is possible to further reduce the operation force of the reclining operation lever 23 that is necessary for moving outward in the radial direction.

  In addition, only the urging | biasing surface 64a of the recessed part 64 of the movable guide 63 among both the recessed parts 35 and 64 may incline and form in a radial direction as mentioned above.

In addition, this invention is not limited to the said embodiment, You may actualize as follows.
(1) The spring member 80 is not limited to rotationally biasing the cam 70 by the other side end portion 82 engaging the cam 70, but may be another member that should exert a biasing force in a predetermined direction, for example, The other member may be biased in the predetermined direction by being engaged with a lock gear or the like.

(2) The number of lock gears guided by the guide protrusions 31 and 32 of the base plate 30 is not limited to the four first lock gears 61 and the two second lock gears 62, and may be three or five or more, for example. There may be. In this case, a part of each lock gear is arranged to be guided by the movable guide 63 in which the recess 64 is formed and the first guide surface 33a in which the recess 35 is formed. The one end portion 81 of the spring member 80 is engaged with the engaged portion 65 configured by the following. Even in this case, the urging force acting on the movable guide 63 at the time of unlocking can be reduced without reducing the urging force of the spring member 80 itself for urging the movable guide 63.

DESCRIPTION OF SYMBOLS 10 ... Vehicle seat 11 ... Seat cushion (1st member)
11a: Lower bracket (first member)
12 ... Seat back (second member)
12a ... Upper bracket (second member)
20 ... Reclining device 23 ... Reclining operation lever (operation member)
30 ... Base plate 31, 32 ... Guide convex part 33a ... One first guide surface (one guide surface)
33b ... the other first guide surface (the other guide surface)
34a ... One second guide surface 34b ... The other second guide surface 35 ... Recess 40 ... Gear plate 41 ... Inner teeth 61 ... First lock gear 61a ... External teeth 62 ... Second lock gear 62a ... External teeth 63 ... Movable guide 64 ... concave portion 64a ... biasing surface 65 ... engaged portion 70 ... cam 80 ... spring member (biasing member)
81: One side end (engagement end)
82 ... other side end 90 ... cam lever

Claims (2)

A reclining device that adjusts a tilt angle between a first member and a second member that tilt relatively,
A base plate attached to the first member;
A gear plate attached to the second member and assembled to be rotatable relative to the base plate and having internal teeth;
A lock gear having outer teeth which are guided and assembled so as to be slidable in the radial direction in a state of being in contact with one of the pair of guide surfaces formed on the base plate;
It is arranged so as to be in contact with both the other guide surface of the pair of guide surfaces and the lock gear and be urged radially inward of the base plate, and gradually increase in width from the outer end toward the inner end. A narrow movable guide,
A cam that can control movement of the lock gear and the movable guide in the radial direction, and is urged to rotate in a direction in which the outer teeth mesh with the inner teeth;
A biasing member for biasing the movable guide inward in the radial direction;
An operation member that moves the movable guide radially outward by releasing the engagement between the external teeth and the internal teeth by rotating the cam against the rotation bias; and
With
The other guide surface and the opposing surface of the movable guide that opposes the other guide surface are each formed with a recess that constitutes an engaged portion with which the engagement end of the biasing member is engaged ,
The concave portion of the movable guide is formed such that a biasing surface that receives a biasing force from the engagement end portion is inclined inward in the radial direction toward the other guide surface side,
The concave portion of the other guide surface is formed such that a biasing surface that receives a biasing force from the engagement end portion is inclined inward in the radial direction toward the movable guide side, and the degree of inclination of the movable guide is The same as the slope in the recess,
The engagement end, the reclining device in cross-section and wherein Rukoto is formed in a circular shape.   2. The biasing member according to claim 1, wherein the biasing member biases the movable guide inward in the radial direction and rotationally biases the cam in a direction in which the outer teeth mesh with the inner teeth. Reclining device.

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