JP5857505B2 - Vehicle seat reclining device - Google Patents

Description

  The present invention relates to a vehicle seat reclining device that adjusts an inclination angle of a seat back with respect to a seat cushion.

  Conventionally, various types of such vehicle seat reclining devices have been proposed. For example, the vehicle seat reclining device described in Patent Document 1 includes two locking wedge members (14) controlled by a sliding lock portion (20) installed on a guide member (21) of a fixed end plate (10). Is locked by engaging with the movable end plate (11). Alternatively, the vehicle seat reclining device releases the engagement with the movable end plate by sliding the locking wedge members radially inward from the locked state. Thereby, the rotation angle of the movable end plate with respect to the fixed end plate can be adjusted, and the inclination angle of the seat back with respect to the seat cushion can be adjusted.

  The vehicle seat reclining device further includes an annular storage device (40) and a toothed storage wedge member (46), and the storage wedge member is moved to a movable end when the seat back is moved forward. By engaging with the plate, the storage device and the movable end plate are connected so as to rotate together. When the movable end plate is rotated with respect to the fixed end plate together with the storage device, the circular guide portion (43) of the storage device and the protrusion (17) of the locking wedge member are slid while contacting each other. Thus, the disengaged state (unlocked state) between the locking wedge member and the movable end plate is maintained.

  Thereafter, when the seat back is raised rearward and reaches the final adjustment position, which is the position of the seat back immediately before being moved forward, the protrusion of the locking wedge member enters the notch (41) of the storage device. Thus, the rotation of the movable end plate (and the storage device) with respect to the fixed end plate is automatically locked. In addition, the storage wedge member held radially inward by the arc-shaped guide portion (51) provided on the fixed end plate is released radially outward to return to the normal locked state. .

  On the other hand, the vehicle seat reclining device described in Patent Document 2 includes three lock slugs (controlled by a lock cam (29) and an unlock plate (31)) rotatably installed on a fixed side plate (11). 23) is locked by engaging the movable side plate (13). Alternatively, the vehicle seat reclining device releases the engagement with the movable side plate by sliding these lock slugs radially inward from the locked state. Thereby, the rotation angle between both side plates can be adjusted, and the inclination angle of the seat back with respect to the seat cushion can be adjusted.

  The vehicle seat reclining device further includes a U-shaped storage plate (40) and a toothed storage slug (44), and the storage slug is used as a movable side plate when the seat back is moved forward. By engaging, the storage slug and the movable side plate are connected to rotate integrally. Then, when the side plate movable with the storage slag is rotated relative to the fixed side plate, the circular guide (42) of the storage plate or the circular guide (47) of the storage slag and the protrusion (27) of the lock slug are used. By sliding while making contact, the state of disengagement between the lock slug and the movable side plate (unlocked state) is maintained.

  Thereafter, when the seat back is raised rearward and reaches the final adjustment position, which is the position of the seat back immediately before the seat is moved forward, the lock slug is inserted into the gap (48) provided in a part of the circular guide of the storage slug. When the protrusion enters, the lock slug is released radially outward to automatically lock and return to the normal locked state.

Japanese Patent Laid-Open No. 11-196969 Japanese Patent Laid-Open No. 11-70028

  By the way, in Patent Document 1, since the locking wedge member and the storage wedge member are disposed at the same position in the axial direction of the rotation axis of the movable end plate with respect to the fixed end plate (the thickness direction of the apparatus), these interferences are prevented. In order to avoid this, the number of lock wedge members that can be installed is limited. When the number of locking wedge members is increased in order to ensure sufficient locking strength, the overall size of the device is increased in order to secure an increased installation space for the locking wedge members. Will be forced to. In addition, the structure related to the storage function tends to be a dedicated design, and it becomes difficult to share with a general-purpose vehicle seat reclining device.

  On the other hand, Patent Document 2 employs a structure in which lock slugs and storage slugs are arranged at different positions in the axial direction of the rotation shafts of both side plates. However, when the seat back is moved forward or returned, when the side plate movable with the storage slag is rotated with respect to the fixed side plate, the protrusion of the lock slag becomes the circular guide of the storage plate and the circular guide of the storage slag. Slide while sequentially contacting. However, the boundary between the storage plate and the storage slug is provided with a predetermined clearance for allowing the relative movement thereof, and the protrusion of the lock slug sequentially slides the circular guide of the storage plate and the circular guide of the storage slug. When moving, there is a possibility of being caught by a step generated at the boundary between them.

  In particular, while the lock slug is in contact, the external teeth of the memory slag will cooperate while engaging with the complementary teeth of the movable side plate, but the memory slag will slide in the radial direction. As a result, it is difficult to keep the meshing evenly in terms of the shape of the teeth, and the storage slag is inclined to increase the clearance at the boundary between the storage slag and the storage plate. Therefore, the protrusion of the lock slug is more easily caught.

  An object of the present invention is to secure a sufficient lock strength while adding a memory function of an inclination angle of a seat back, and to further facilitate sliding of a pole when the seat back is tilted due to a memory operation. An object of the present invention is to provide a vehicle seat reclining device.

  In order to solve the above problems, the invention according to claim 1 is a first member fixed to either the seat cushion side or the seat back side, and either the seat cushion side or the seat back side. A second member fixed to the other and rotatably supported by the first member and a plurality of guide grooves provided in the first member are guided in the radial movement, respectively, and are provided in the second member. A plurality of poles having external teeth that can be engaged with and disengaged from the internal teeth, and the first member is rotatably provided so that the plurality of poles are directed inward during an unlocking operation accompanying rotation in one direction. A cam that pulls in and releases the external teeth from meshing with the internal teeth, and presses the plurality of poles outward when the lock is actuated in rotation in the other direction to mesh the external teeth with the internal teeth Body and said cam body An urging member that urges to rotate toward the locking operation side, and is provided rotatably on the first member, and is released from the rotation transmission from the cam body at the time of unlocking operation and rotated in one direction. A switching member linked to the cam body so that the cam body is unlocked when the memory is activated, and having either one of a switching cam surface and a switching cam protrusion guided by the switching cam surface, and an axial direction The plurality of poles are arranged at positions different from the positions of the external teeth, and have one of the switching cam surface and the switching cam protrusion and are connected to the switching member, and the memory operation of the switching member A memory member that is fixed to the second member by guiding the switching cam projection by the switching cam surface, and that allows relative rotation of the first member and the second member in the fixed state; Of the And a sliding protrusion projecting in an axial direction opposite to the memory member, and the memory member is in the unlocking operation of the cam body accompanying the memory operation of the switching member. The movement trajectory in the circumferential direction of the sliding projection is released and the sliding projection is slid during the relative rotation of the first member and the second member integrally with the memory member, so that the external teeth are The gist is to have a memory cam surface for locking the movement of the pole toward the side meshing with the internal teeth.

  According to this configuration, when the cam body is unlocked without the memory operation of the switching member, the plurality of poles are respectively drawn inward and the external teeth are disengaged from the internal teeth. Accordingly, the locking of the relative rotation of the first member and the second member is released, and the rotation of the seat back with respect to the seat cushion is allowed. In addition, when the operation force for unlocking the cam body is released, the cam body that is rotationally biased by the biasing member is locked so that the plurality of poles are respectively pressed outward. Then, the outer teeth mesh with the inner teeth. Thereby, the relative rotation of the first member and the second member is locked, and the rotation of the seat back with respect to the seat cushion is restricted. In these cases, the memory member remains connected to the switching member without being fixed to the second member, so that the first member regardless of the relative rotation of the first member and the second member. There is no displacement with respect to. As described above, the seat back can be adjusted and held at a required inclination angle suitable for passenger seating and the like.

  On the other hand, when the memory of the switching member is operated, the memory member is fixed to the second member by the guide of the switching cam protrusion by the switching cam surface. In addition, by the unlocking operation of the cam body accompanying the memory operation of the switching member, each of the plurality of poles is pulled inward, and the external teeth are disengaged from the internal teeth. The memory member releases the circumferential movement locus of the sliding protrusion of the pole drawn inward along the guide groove by the memory cam surface, and the first member and the second member. The sliding protrusion is slid during relative rotation of the member, and the movement of the pole toward the side where the external teeth mesh with the internal teeth (movement toward the outside along the guide groove) is locked. Further, the rotation of the cam body is locked as the movement of the outer teeth of the pole to the side meshing with the inner teeth is stopped, so that the remaining the protrusions that do not include the sliding protrusions are stopped. The movement of the pole toward the side where the external teeth mesh with the internal teeth is locked. Therefore, when the first member and the second member are rotated relative to each other, even if the operation force for unlocking the cam body is released together with the operation force for memory operation of the switching member, The state where the external teeth and the internal teeth cannot be engaged is maintained, and the permissible state of rotation of the seat back with respect to the seat cushion is maintained. Thereafter, when the first member and the second member rotate in opposite directions and return to the original position immediately before the memory operation, the sliding protrusion is released from the memory cam surface, and the pole The movement of the outer teeth to the side meshing with the inner teeth is allowed. In addition, the cam body is allowed to rotate in accordance with the movement of the outer teeth of the pole toward the side meshing with the inner teeth, so that the remaining poles without the sliding protrusions The outer teeth are allowed to move to the side that meshes with the inner teeth. Therefore, when the cam body rotated and urged by the urging member is locked, all of the plurality of poles are pressed outward and the external teeth mesh with the internal teeth. Thereby, the relative rotation of the first member and the second member is locked again, and the rotation of the seat back with respect to the seat cushion is restricted. As described above, the seat back can be returned to and held at the original inclination angle immediately before the memory operation.

  In particular, since the memory member is arranged at a position different from the position of the external teeth of the plurality of poles in the axial direction, the number of installable poles is limited by the memory member. Can be avoided. Thereby, the number of poles that can ensure sufficient lock strength can be provided without increasing the size of the entire apparatus. Further, when the first member and the second member are rotated relative to each other by the memory operation of the switching member, the sliding protrusion of the pole continues to the memory member when the movement of the pole is locked. Since the memory cam surface formed as a surface slides, it is possible to suppress the sliding of the sliding protrusion from being inhibited during the relative rotation of the first member and the second member.

Further, in the invention described in claim 1, wherein each of the switching cam surface and the switch cam protrusion is disposed in pair at positions different from each other.

  According to this configuration, when the memory of the switching member is operated, the memory member is fixed to the second member in a more stable state by guiding the pair of switching cam protrusions by the pair of switching cam surfaces. At the same time, relative rotation of the first member and the second member is allowed in the fixed state. Accordingly, the posture of the memory member at this time can be further stabilized.

According to a second aspect of the invention, the vehicle seat reclining device according to claim 1, when the memory operation of the switching member, the memory member, especially in parallel to offset axis to the axis of the switching member The gist is to rotate and be fixed to the second member.

  According to this configuration, the memory member can set the rotation amount (movement amount) in a relationship proportional to the rotation amount of the switching member. Thereby, even if the amount of rotation of the switching member is small, the memory member can be more securely fixed to the second member by proportionally increasing the amount of rotation of the memory member. Accordingly, for example, when the memory of the switching member is operated, after the memory member is fixed to the second member, the cam body is unlocked and the outer teeth and the inner teeth of the plurality of poles are operated. The meshing can be released.

According to a third aspect of the present invention, in the vehicle seat reclining device according to the first or second aspect , the switching protrusion of the memory member moves with the sliding operation of the switching member. Is in contact with one side surface in the circumferential direction centered on the axis of the first protrusion, and is provided on one pole not projecting from the sliding protrusion in the axial direction opposite to the memory member. The gist is provided with a guide protrusion that abuts against the other side surface in the circumferential direction centering on the axis of the switching member of the memory member that moves with the memory operation.

  According to the configuration, when the memory of the switching member is operated, the memory member moves while being sandwiched in the circumferential direction around the axis of the switching member by the sliding protrusion and the guide protrusion. It is fixed to the second member. Therefore, it is possible to prevent the memory member from being displaced in the circumferential direction around the axis of the switching member until the memory member is fixed to the second member.

According to a fourth aspect of the present invention, in the vehicle seat reclining device according to any one of the first to third aspects, the sliding protrusion engages with the cam body during unlocking operation. The gist is that it is also used as an engaging projection protruding from the pole.

  According to this configuration, since it is not necessary to separately project the engaging projection on the pole from which the sliding projection is projected, the structure of the pole can be further simplified.

  In the present invention, a vehicle that can secure a sufficient lock strength while adding a memory function of an inclination angle of the seat back and can further smoothly slide a pole when the seat back is tilted due to a memory operation. A seat reclining device can be provided.

1 is a front view showing a vehicle seat device to which an embodiment of the present invention is applied. The side view which shows the vehicle seat apparatus and its operation | movement. The disassembled perspective view which shows the same embodiment. The disassembled perspective view which shows the same embodiment. The side view which looked at the locked state of the embodiment from the width direction inner side. Sectional drawing along the AA line of FIG. (A) and (b) are sectional drawings along the BB line and CC line of FIG. 6 in a locked state. (A) and (b) are sectional views along the BB line and CC line of FIG. 6 of the seat back in the unlocked state. Sectional drawing along the BB line | wire of FIG. 6 when a seat back arrives at an upright position in the unlocked state. Sectional drawing along the BB line of FIG. 6 in the state immediately after memory operation. Sectional drawing along the BB line | wire of FIG. 6 when a seat back exists in a forward-falling area in the state of memory operation. (A) (b) is a side view which shows a 1st operation lever and its operation | movement. The perspective view which shows a memory shaft and its periphery structure. (A)-(c) is a cross-sectional view which shows the engagement structure of a connection shaft and a memory shaft, and its operation | movement.

  With reference to FIGS. 1-14, one Embodiment which actualized this invention to the vehicle seat apparatus provided with the walk-in mechanism is described. In the following description, the front-rear direction, the width direction, and the up-down direction are the same as the corresponding directions in the vehicle.

  As shown in FIG. 1, on a vehicle floor (not shown), a pair of lower rails 1 arranged in parallel in the width direction is fixed in a manner extending in the front-rear direction (direction orthogonal to the paper surface in FIG. 1). At the same time, a pair of upper rails 2 are supported by these lower rails 1 so as to be movable in the front-rear direction. The lower rail 1 and the upper rail 2 constitute a seat slide mechanism, and are configured to selectively allow the movement of the upper rail 2 in the front-rear direction with respect to the lower rail 1 by a slide lock device (not shown).

  On both the upper rails 2, a substantially square frame-like cushion frame 3 that constitutes a skeleton of a seat cushion is placed. A pair of lower plates 4 made of a plate material are fixed to the cushion frame 3 by welding on the outer surfaces of the rear ends of the pair of cushion side frames 3a and 3b constituting both sides in the width direction. The lower plate 4 is connected through a pair of seat reclining devices 5 to a substantially square frame-like seat back frame 6 that forms a skeleton of the seat back so as to be rotatable (tilted).

  That is, the pair of back side frames 6a and 6b constituting both sides in the width direction of the seat back frame 6 has their lower end portions in the width direction of the rear end portions (lower plates 4) of the cushion side frames 3a and 3b. Adjacent inside. A rod-like connecting shaft 91 having an axial line extending in the width direction and extending in the direction passes through both the lower plates 4 at the lower ends of both the back side frames 6a and 6b. The seat back frame 6 is connected to both lower plates 4 via both seat reclining devices 5 so as to be rotatable about the axis of the connecting shaft 91. Thereby, the inclination angle of the seat back with respect to the seat cushion can be adjusted.

  A fixing flange 7 that extends outward in the width direction on the upper side of the coupling shaft 91 is joined to the outer side surfaces of the cushion side frames 3a and 3b, and the lower plate is attached to the outer side surfaces of the back side frames 6a and 6b. 4 and a movable flange 8 that extends outward in the width direction above the fixed flange 7 are joined. The inner end and the outer end of the spiral spring 9 are locked to the fixed flange 7 and the movable flange 8, respectively. The spiral spring 9 is for rotating and energizing the seat back in the forward-falling direction with respect to the seat cushion.

  As shown in FIG. 2, the seat back (seat back frame 6) has a seating region for adjusting the tilt angle and a forward tilting region on the front side of the seating region as a tilting region, and within the tilting region, a connecting shaft The seat cushion (seat cushion frame 3) can be tilted about the axis 91. This tilting area is based on the “upright position” where the seat back is raised.

  The seating region is a region sandwiched between the “upright position” and the “largely tilted position” where the seat back is inclined more backward than that. The seat reclining device 5 described above is mainly for adjusting and maintaining the inclination angle of the seat back with respect to the seat cushion in this seating region. In the drawing, the angular position of the seat back frame 6 indicated by a solid line is the angular position of the seat back that is most frequently used when a general occupant is seated (hereinafter referred to as “neutral position”).

  Further, the forward tilting area is an area sandwiched between the “upright position” and the “forward tilting position” where the seat back is tilted forward. In particular, the operation of the seat back that is tilted from the seating area to the “forward position” of the forward tilt area is called “forward tilt”. The walk-in mechanism is for slidably moving the seat cushion forward with respect to the vehicle floor by releasing the above-described slide lock device or the like in conjunction with the forward movement of the seat back.

  Next, the seat reclining device 5 will be described. Note that both the seat reclining devices 5 have the same structure except that they are bilaterally symmetric with each other, so that only one side will be described below as a representative.

  As shown in FIGS. 3 and 4, the seat reclining device 5 includes a disk-shaped lower arm 10 as a first member and a disk-shaped upper arm 20 as a second member. The lower arm 10 is fixed to the inner surface (seat cushion side) of the lower plate 4 by welding concentrically with the rotation axis O1 coinciding with the axis of the connecting shaft 91, and the upper arm 20 is also concentric with the rotation axis O1. Thus, it is fixed to the outer surface (seat back side) of the lower end portion of the back side frames 6a, 6b by welding.

  As shown in FIG. 3, the lower arm 10 is formed by, for example, half punching (half blanking) of a metal plate, and has a circular recess 11 that opens to the upper arm 20 side. The recess 11 has an inner peripheral surface 11a centering on the rotation axis O1 of the connecting shaft 91 (the lower arm 10 and the upper arm 20).

  In the concave portion 11 of the lower arm 10, three substantially fan-shaped convex portions 12 are arranged at equiangular intervals on the circumference. Each convex portion 12 forms guide walls 13 and 14 on both sides in the circumferential direction. The guide walls 13 and 14 facing each other in the circumferential direction of the adjacent convex portions 12 extend in parallel to each other in the radial direction around the rotational axis O1, and cooperate with the bottom surface of the concave portion 11 to rotate the rotational axis O1. Guide grooves 15 having substantially U-shaped grooves extending in the radial direction as the center are formed at equal angular intervals on the circumference. These guide grooves 15 communicate with each other at the center, and have a substantially Y shape as a whole.

  In addition, a substantially circular through hole 16 is formed in a central portion where the three guide grooves 15 of the lower arm 10 communicate with each other. The through-hole 16 has a locking hole 16a that is recessed radially outward at a predetermined angular position.

  As shown in FIG. 4, the upper arm 20 is formed by, for example, half-cutting a metal plate, and has an outer peripheral surface 20 a having an outer diameter equal to the inner diameter of the inner peripheral surface 11 a of the lower arm 10 and on the lower arm 10 side. It has a circular recess 21 that opens. Inner teeth 22 are formed over the entire circumference on the inner circumferential surface 21 a centering on the rotation axis O <b> 1 of the recess 21. Further, a circular recess 23 is formed on the inner peripheral side of the recess 21 concentrically with the recess 21. On the inner peripheral surface 23a of the recess 23, a substantially arc-shaped protrusion 24 that protrudes toward the rotation axis O1 at a predetermined angular position is formed.

  As shown in FIG. 6, the upper arm 20 is fitted on the outer peripheral surface 20 a so as to be in sliding contact with the inner peripheral surface 11 a of the lower arm 10. A ring-shaped holder 29 made of a metal plate is attached to the outer peripheral portions of the lower arm 10 and the upper arm 20 in a state where the inner peripheral surface 11a of the lower arm 10 and the outer peripheral surface 20a of the upper arm 20 are fitted. . The lower arm 10 and the upper arm 20 are prevented from coming off in the axial direction in a state where relative rotation is permitted by the holder 29.

  As shown in FIGS. 3 and 4, a lock mechanism 30 and a memory mechanism 70 are disposed between the lower arm 10 and the upper arm 20. The lock mechanism 30 mainly includes three poles 31A, 31B, and 31C, a cam 32, a release plate 33, a spiral spring 34 as an urging member, and a pressing member 35.

The poles 31A to 31C are mounted between two adjacent guide walls 13 and 14, and are arranged at equiangular intervals in the circumferential direction around the rotation axis O1.
The pole 31 </ b> A includes a first block 41 and a second block 42 which are manufactured by forging a steel material and are formed in a stepped manner in the axial direction. In the pole 31 </ b> A, the first block 41 is disposed on the inner peripheral surface 21 a side of the upper arm 20, and the second block 42 is disposed on the axial center side of the upper arm 20. Both the width end portions 311 and 312 of the first block 41 and the second block 42 are formed to be coincident with each other and to be parallel straight lines. Outer teeth 44 that can mesh with the inner teeth 22 of the upper arm 20 are formed at the arc-shaped outer ends of the first block 41 (end surfaces facing the inner teeth 22 of the upper arm 20). An inner surface cam portion 45 that engages with the outer peripheral portion of the cam 32 is formed at the end (the back surface that is the end surface opposite to the outer end). Further, the second block 42 is provided with a pole-side groove cam portion 46 penetrating in the plate thickness direction at a substantially central portion in the width direction.

  The pole 31A is guided to move in the radial direction about the rotation axis O1 in such a manner that the width end portions 311 and 312 are in sliding contact with the guide walls 13 and 14, respectively. The pole 31 </ b> A moves forward and backward in the radial direction along both guide walls 13 and 14, thereby meshing or releasing (engaging / disengaging) the outer teeth 44 and the inner teeth 22. The pole 31A is provided with an arcuate engagement portion 43 protruding in the axial direction toward the upper arm 20 so as to face the recess 23 (inner peripheral surface 23a) in the radial direction.

  On the other hand, the poles 31B and 31C are manufactured by pressing a plate-shaped steel plate or the like, and the second block 42 of the pole 31A is cut off to have a step similar to the shape constituted only by the first block 41. There is no flat plate shape. That is, the poles 31 </ b> B and 31 </ b> C are shorter than the pole 31 </ b> A in the radial direction by the amount of the second block 42, and the plate thickness is made thinner by the plate thickness of the second block 42. In the poles 31B and 31C, both width end portions 313 and 314 are formed in parallel straight lines, similarly to the pole 31A. Outer teeth 47 that can mesh with the inner teeth 22 of the upper arm 20 are formed at the arc-shaped outer ends of the poles 31B and 31C, and the inner ends of the poles 31B and 31C are engaged with the outer peripheral portion of the cam 32. An inner surface cam portion 48 is formed. Further, the poles 31 </ b> B and 31 </ b> C are provided with a cylindrical engagement protrusion 49 projecting toward the release plate 33 at the center in the circumferential direction. In the following description, the engaging protrusions 49 of the poles 31B and 31C may be distinguished as “49B and 49C” for convenience.

  The poles 31B and 31C are guided to move in the radial direction around the rotation axis O1 in such a manner that the width end portions 313 and 314 are in sliding contact with the guide walls 13 and 14, respectively. The poles 31 </ b> B and 31 </ b> C advance or retreat in the radial direction along both the guide walls 13 and 14, thereby meshing or releasing (engaging / disengaging) the external teeth 47 and the internal teeth 22.

  Here, as shown in FIG. 7B, the inner surface cam portion 45 formed in the step portion of the pole 31A has three pole-side cam surfaces 50a on the center portion in the circumferential direction of the pole 31A and on both sides in the circumferential direction. , 50b, 50c. These pole-side cam surfaces 50 a to 50 c are opposed to the outer peripheral portion (cam surface 55) of the cam 32. The pole-side cam surfaces 50a to 50c have inclined surfaces that approach the outer peripheral portion of the cam 32 when the cam 32 is locked when the cam 32 rotates in the illustrated counterclockwise rotation direction (hereinafter also referred to as “lock rotation direction”). It consists of a cam surface.

  The inner surface cam portion 48 formed at the inner end of the pole 31B also includes three pole-side cam surfaces 51a, 51b, 51c having a shape similar to the inner surface cam portion 45 of the pole 31A. On the other hand, the inner surface cam portion 48 formed at the inner end of the pole 31C includes a pole side cam surface 52 in place of the pole side cam surface 51c of the pole 31B. The pole-side cam surface 52 is shaped so as to form a wedge-shaped space with the guide wall 13 facing in the circumferential direction. That is, the interval between the guide wall 13 and the pole-side cam surface 52 is formed so as to become narrower toward the outer side in the radial direction.

  As shown in FIGS. 6 and 7B, the cam 32 is rotatably disposed on the rotation axis O1 on the inner peripheral side of the poles 31A to 31C in the recess 21 of the upper arm 20. That is, the cam 32 is produced by pressing a plate-shaped steel plate or the like, and has a flat plate shape without a step. In the central portion of the cam 32, a substantially oval cam fitting hole 32a that penetrates in the plate thickness direction along the rotation axis O1 is formed. On the other hand, a substantially oval column-shaped fitting portion 92 that fits in the cam fitting hole 32a is formed at the tip of the connecting shaft 91 that penetrates the seat reclining device 5 along the rotation axis O1 together with the lower plate 4 and the like. Has been. As a result, the cam 32 is rotatable about the rotation axis O1 integrally with the connecting shaft 91 on the inner peripheral side of the poles 31A to 31C. Needless to say, the left and right cams 32 (lock mechanism 30) are connected to each other via the connecting shaft 91 so as to operate in synchronization with each other.

  As shown in FIG. 7B, the cam 32 has three sets of cam surfaces 55 at equal angular intervals on the circumference on the outer periphery thereof. Each cam surface 55 is provided with three pressing cam portions 55a, 55b, and 55c on the central portion in the circumferential direction and on both sides in the circumferential direction. Of these, the two pressing cam portions 55a and 55b can abut against the two pole-side cam surfaces 50a and 50b opposed to the pole 31A or the two pole-side cam surfaces 51a and 51b opposed to the poles 31B and 31C. Yes, when the cam 32 is rotated in the lock rotation direction, the corresponding pole cam surfaces 50a, 50b, 51a, 51b are pressed.

  On the other hand, the remaining one of the pressing cam portions 55c can come into contact with the remaining pole-side cam surfaces 50c and 51c facing the poles 31A and 31B, and the cam 32 is rotated in the lock rotation direction. Sometimes the corresponding pole side cam surfaces 50c, 51c are pressed. Alternatively, the pressing cam portion 55c accommodates the spherical pressing member 35 in the aforementioned wedge-shaped space formed between the pole-side cam surface 52 of the pole 31C and the guide wall 13. The pressing member 35 is sandwiched in the axial direction by the concave portion 11 of the lower arm 10 and the peripheral portion of the release plate 33, and can move in the radial direction while being in sliding contact with the pole-side cam surface 52 and the guide wall 13. . The pressing cam portion 55c can circumscribe the pressing member 35, and presses the pressing member 35 when the cam 32 is rotated in the lock rotation direction.

  That is, when the cam 32 is rotated in the lock rotation direction, the pressing cam portions 55a to 55c are connected to the pole side cam surfaces 50a to 50c of the pole 31A, the pole side cam surfaces 51a to 51c of the pole 31B, and the pole 31C. It is held at an angular position where it comes into contact (pressure contact) with the pole cam surfaces 51a, 51b and the pressing member 35, respectively.

  The pressing member 35 is pressed against the guide wall 13 and the pole-side cam surface 52 by being pressed by the cam 32. At this time, the pressing force of the pressing member 35 is decomposed into a component force of the moving direction component (radial direction component) of the pole 31C and a component force of the width direction component (circumferential component) of the pole which is a direction orthogonal to the moving direction. Is done. Then, the wedge action caused by pressing with the component of the component in the width direction of the pole generates a circumferential force in which the width end 313 of the pole 31C and the guide wall 13 are separated from each other, and the width end 314 of the pole 31C. And the guide wall 14 are filled. This is for suppressing rattling of the seat back with respect to the seat cushion.

  On the other hand, as shown in FIG. 8B, during the unlocking operation accompanying the rotation of the cam 32 in the illustrated clockwise rotation direction (hereinafter also referred to as “unlock rotation direction”), the pressing cam portions 55a and 55b are It is separated from the pole side cam surfaces 50a and 50b of the pole 31A or the pole side cam surfaces 51a and 51b of the poles 31B and 31C. The pressing cam portion 55 c is separated from the pole side cam surfaces 50 c and 51 c of the poles 31 </ b> A and 31 </ b> B, or is separated from the pressing member 35.

  As shown in FIG. 3, a plurality of (three) engaging protrusions 57 project from the side surface of the cam 32 at intervals on the circumference, and one of the engaging protrusions 57 is a pole of the pole 31A. The side groove cam portion 46 is inserted and engaged. The pole-side groove cam portion 46 and the engagement protrusion 57 act to move the pole 31A radially inward by the rotation of the cam 32 in the unlock rotation direction. That is, as shown in FIG. 7 (a), the pole-side groove cam portion 46 is formed so as to gradually advance radially outward as it goes in the unlocking rotation direction (clockwise rotation direction in the drawing) of the cam 32. ing. As a result, the pawl 31 </ b> A pressed by the pole-side groove cam portion 46 is drawn inward in the radial direction by the engaging protrusion 57 as the cam 32 rotates in the unlocking rotation direction.

  As shown in FIG. 3, a fan-shaped release plate 33 made of a thin plate is integrally attached to the inner side surface of the cam 32 by engaging with an engaging protrusion 57. The release plate 33 has an arc-shaped through-hole 33a for avoiding interference with the fitting portion 92 (connection shaft 91) at the center. As shown in FIG. 6, the release plate 33 is attached to the cam 32 so as to be accommodated in the second block 42 of the pole 31A in the range in the axial direction, and is slidably contacted with the end faces of the poles 31B and 31C. Has been. Thus, the poles 31B and 31C and the release plate 33 are accommodated within the thickness range of the pole 31A. Further, as shown in FIG. 7A, the release plate 33 has a fan-shaped outer diameter so as to be in a non-contact state with the protrusion 24 formed on the upper arm 20. That is, the release plate 33 has an outer shape by forming a fan-shaped notch 33b in one portion of the substantially annular plate having the outer diameter. And the pole 31A is arrange | positioned in the part of this notch 33b. Thereby, even if the release plate 33 rotates integrally with the cam 32, the release plate 33 is prevented from interfering with the pole 31A.

  The release plate 33 is formed with two release plate side groove cam portions 59 penetrating in the plate thickness direction with an interval in the circumferential direction around the rotation axis O1. These release plate side groove cam portions 59 are disposed radially outward from the circumferential position of the engagement protrusion 57 so as to correspond to the end surfaces of the poles 31B and 31C, respectively. Engaging protrusions 49 projecting from the poles 31B and 31C are inserted into and engaged with the release plate side groove cam part 59, respectively. When the release plate 33 is rotated in the unlocking rotation direction together with the cam 32 by the engagement of the release plate side groove cam portion 59 and the engagement protrusion 49, the poles 31B and 31C are moved radially inward. ing. That is, as shown in FIG. 7 (a), the release plate side groove cam portion 59 is shaped so as to gradually advance radially outward as it goes in the unlocking rotation direction (clockwise rotation direction) of the cam 32. Has been. As a result, the poles 31B and 31C pressed by the release projection side groove cam portion 59 to the engagement projection 49 during the unlocking operation accompanying the rotation of the release plate 33 integrally with the cam 32 in the unlocking rotation direction Pull inward in the direction.

  As shown in FIG. 4, the spiral spring 34 urges the cam 32 to rotate in the lock rotation direction so as to move the poles 31 </ b> A to 31 </ b> C in the radial direction engaged with the upper arm 20, and the through-hole 16 of the lower arm 10. It is stored inside. The spiral spring 34 is formed, for example, by bending a substantially rectangular flat wire into a predetermined spiral shape, and is interposed between the lower arm 10 and the cam 32. That is, the outer end 34 a of the spiral spring 34 is locked in the locking hole 16 a, and the inner end 34 b is locked in the locking portion 32 b protruding from the end surface of the cam 32.

  Due to the biasing force of the spiral spring 34, the cam 32 is pivotally biased in the lock rotation direction (counterclockwise rotation direction in FIG. 7B) with respect to the lower arm 10, and the cam surface 55 causes the poles 31A to 31C to have a diameter. The outer teeth 44 and 47 are engaged with the inner teeth 22 of the upper arm 20 by pressing outward in the direction.

As shown in FIGS. 3 and 4, the memory mechanism 70 is mainly configured by a trigger plate 71 as a switching member and a memory plate 76 as a memory member.
As shown in FIGS. 6 and 7A, the trigger plate 71 is rotatably disposed on the rotation axis O <b> 1 within the recess 23 of the upper arm 20. That is, the trigger plate 71 is produced by pressing a plate-shaped steel plate or the like, and has a flat plate shape having no step. The trigger plate 71 is formed in a semi-disc shape by notching it in a fan shape only in an angle range corresponding to the pole 31A, and is an arc shape for avoiding interference with the fitting portion 92 (connection shaft 91). While having the insertion groove 71a, it has a pair of coupling hole 71b in the peripheral part of this insertion groove 71a. On the other hand, the connecting shaft 91 is inserted into a cylindrical memory shaft 96 having a shaft insertion hole 96a having an inner diameter equivalent to the outer diameter thereof. The memory shaft 96 is pivotally supported by inserting the connecting shaft 91 into the shaft insertion hole 96a. Therefore, the memory shaft 96 has an axis extending along the rotation axis O1.

  As shown in FIG. 4, the memory shaft 96 has a substantially circular arc column-shaped mounting portion 97 protruding from the tip surface facing the trigger plate 71 along the axial direction, and the coupling holes 71b. A pair of pin-shaped coupling projections 98 are provided on the mounting portion 97 so as to face the mounting portion 97. The trigger plate 71 is joined to the mounting portion 97 in a state in which both coupling protrusions 98 of the memory shaft 96 into which the coupling shaft 91 is inserted are respectively inserted into both coupling holes 71b. As a result, the trigger plate 71 is integral with the memory shaft 96 and is rotatable about the rotation axis O1. It goes without saying that the left and right trigger plates 71 (memory mechanism 70) are coupled to operate in synchronization with each other via the memory shaft 96.

  As shown in FIG. 7 (a), the outer peripheral surface of the trigger plate 71 is the other side in the circumferential direction (the side rotating in the counterclockwise direction) compared to the part on the one side in the circumferential direction (the side rotating in the clockwise direction in the figure). ) Is reduced in diameter, and the outer peripheral surface on that side forms an arcuate first switching cam surface 72 as a switching cam surface having an outer diameter smaller than the inner diameter of the protrusion 24 on the rotation axis O1. To do. The tip of the first switching cam surface 72 on one side in the circumferential direction (the side rotating in the clockwise direction in the figure) forms a cam groove surface 72a having a substantially U-shaped groove shape. The cam groove surface 72a is linearly inclined so as to go in the radial direction approaching the rotation axis O1 as it goes toward one side in the circumferential direction (the side rotating in the clockwise direction in the figure). The trigger plate 71 extends in the circumferential direction around the rotation axis O1 at a portion on the circumferential side that is the inner circumferential side of the first switching cam surface 72 (the side that rotates in the clockwise direction in the drawing). A long switching second switching cam surface 73 is formed as a switching cam surface. The tip of the second switching cam surface 73 on one side in the circumferential direction (the side rotating in the clockwise direction in the figure) forms a cam groove surface 73a having a substantially U-shaped groove shape. The cam groove surface 73a is linearly inclined so as to go in the radial direction away from the rotation axis O1 as it goes to the side rotating in the clockwise direction in the figure.

  As shown in FIGS. 6 and 7A, the memory plate 76 is sandwiched between the release plate 33 and the trigger plate 71 in the axial direction in the recess 21 of the upper arm 20, and is slidably contacted with the end surfaces thereof. It is touched. That is, the memory plate 76 is disposed at a position different from the positions of the first block 41 (external teeth 44) of the pole 31A and the poles 31B and 31C (external teeth 47) in the axial direction.

  The memory plate 76 is manufactured by pressing a plate-shaped steel plate or the like, and has a flat plate shape having no step. The memory plate 76 is formed in an arc shape extending along the outer peripheral edge of each of the release plate 33 and the trigger plate 71, and gradually increases in the radial direction toward the side rotating in the counterclockwise direction shown in the figure. Widened. In addition, a pin-shaped first switching cam protrusion 77 slidably contacting the first switching cam surface 72 of the trigger plate 71 is provided at the tip of the other side in the circumferential direction of the memory plate 76 (the side rotating in the counterclockwise direction in the drawing). And a pin-like second switching cam projection 78 that fits into the second switching cam surface 73 is provided at the tip of one circumferential side (the side that rotates in the clockwise direction in the drawing). ing. That is, the memory plate 76 is connected to the trigger plate 71 via the first and second switching cam protrusions 77 and 78 that are in sliding contact with the first and second switching cam surfaces 72 and 73. The distance between the first and second switching cam protrusions 77 and 78 is set to be equal to the distance between the cam groove surfaces 72a and 73a. Further, external teeth 79 that can mesh with the internal teeth 22 of the upper arm 20 are formed along the outer peripheral surface of the tip of the memory plate 76 on the other side in the circumferential direction (the side rotating in the counterclockwise direction in the drawing). Yes. The inner peripheral surface of the memory plate 76 forms an arc-shaped memory cam surface 76a that protrudes outward.

  Then, as shown in FIGS. 7A and 8A, the first switching cam projection 77 is fitted into the cam groove surface 72a of the first switching cam surface 72 and the second switching cam projection 78 is the first. 2 In the state of being fitted into the cam groove surface 73 a of the switching cam surface 73, the outer peripheral surface of the memory plate 76 extends in the circumferential direction with an interval toward the inner peripheral side of the inner teeth 22. The external teeth 79 of the memory plate 76 are released from the internal teeth 22 (upper arm 20). At this time, regardless of whether the external teeth 47 and internal teeth 22 of the poles 31B and 31C are engaged or disengaged, the memory plate 76 is centered on the rotation axis O1 between the engaging projections 49B and 49C of the poles 31B and 31C. It is sandwiched in the circumferential direction. In other words, in this state, the movement of the memory plate 76 in the circumferential direction is restricted by the engagement projections 49B and 49C abutting on both sides in the circumferential direction.

  Here, in conjunction with the rotation of the memory shaft 96, as shown in FIG. 10, when the memory is activated due to the rotation of the trigger plate 71 in the illustrated clockwise rotation direction (hereinafter also referred to as “memory operation rotation direction”). When the first and second switching cam protrusions 77 and 78 of the memory plate 76 guided by the first and second switching cam surfaces 72 and 73 are disengaged from the cam groove surfaces 72a and 73a, the memory plate 76 is The distal end on the first switching cam projection 77 side is pushed outward in the radial direction, and the distal end on the second switching cam projection 78 side is pulled inward in the radial direction. The memory plate 76 is locked and fixed to the inner teeth 22 (upper arm 20) by engaging the outer teeth 79 with the inner teeth 22. At this time, the memory cam surface 76a of the memory plate 76 is set to extend along an arc centered on the rotation axis O1. The operation of the memory plate 76 during the memory operation of the trigger plate 71 is a rotation about an axis that is parallel to the outer side of the seat reclining device 5 with respect to the rotation axis O1. This is because the memory plate 76 is more securely fixed to the upper arm 20 by proportionally increasing the rotation amount of the memory plate 76 even if the rotation amount of the trigger plate 71 is small.

  At this time, if the external teeth 47 and the internal teeth 22 of the poles 31B and 31C are still engaged, the memory plate 76 still has both engaging projections 49B and 49C abutting on both sides in the circumferential direction. As a result, the movement in the circumferential direction remains restricted. On the other hand, as shown in FIG. 10, when the engagement between the external teeth 47 and the internal teeth 22 of the poles 31B and 31C is released along with the rotation of the cam 32 and the release plate 33, the memory plate 76 is engaged with the pole 31C. When the mating protrusion 49C is disengaged from the side surface on the side, rotation in the illustrated counterclockwise direction integrally with the upper arm 20 is allowed. That is, the memory plate 76 releases the circumferential movement locus of the engaging protrusion 49C of the pole 31C on the memory cam surface 76a. Accordingly, when the upper arm 20 rotates in the counterclockwise direction shown in the figure, the memory plate 76 slides the first and second switching cam projections 77 and 78 on the first and second switching cam surfaces 72 and 73. While rotating integrally with the upper arm 20.

  At this time, the pawl 31 </ b> C is engaged with the outer teeth 47 and the inner teeth 22 by the movement of the engagement protrusions 49 </ b> C sliding on the memory cam surface 76 a of the memory plate 76 in the radial direction. It remains unlocked. Due to the rotation locking of the release plate 33 and the cam 32 accompanying the movement locking of the pole 31C, the other pawls 31A, 31B also remain disengaged from the outer teeth 44, 47 and the inner teeth 22. On the other hand, the memory plate 76 remains engaged with the outer teeth 79 and the inner teeth 22 because the movement toward the radially inner side is stopped on the memory cam surface 76a on which the engaging protrusion 49C slides. Along with this, the trigger plate 71 also remains rotationally locked in the memory operating state.

  In this state, as shown in FIG. 11, when the first and second switching cam projections 77 and 78 sliding on the first and second switching cam surfaces 72 and 73 reach their end points, the upper arm 20 is now turned on. The engaging portion 43 of the pole 31A rides on the protruding portion 24. As a result, the movement of the pole 31 </ b> A toward the outside in the radial direction is stopped, and the meshing between the outer teeth 44 and the inner teeth 22 remains released. The tilting area of the seat back (seat back frame 6) corresponding to the rotation range of the upper arm 20 when the engaging part 43 of the pole 31A rides on the protrusion 24 coincides with the above-described forward tilting area.

  Next, the engagement structure of the connection shaft 91 and the memory shaft 96 will be described. As shown in FIGS. 3 and 6, the connecting shaft 91 is provided with a column-shaped transmitted portion 93 that protrudes radially outward at an intermediate portion in the axial direction of the fitting portion 92 that is on the inner side in the width direction than the upper arm 20. It has been. On the other hand, the memory shaft 96 is formed with a long hole-like transmission portion 99 extending in the circumferential direction. In this transmission part 99, a transmitted part 93 of the connecting shaft 91 is movably inserted.

  As described above, the cam 32 that is rotationally biased by the spiral spring 34 is normally held at a predetermined rotational position where the outer teeth 44 of the pole 31A mesh with the inner teeth 22 of the upper arm 20, The connecting shaft 91 connected to the cam 32 so as to rotate integrally is also held at a predetermined rotation position. On the other hand, as shown in FIG. 13, the cable link 100 is fixed to the outer peripheral surface of the memory shaft 96 so as to integrally rotate inside the transmission portion 99 in the width direction. One end of a coil spring 101 wound around the memory shaft 96 between the transmission portion 99 and the cable link 100 is locked to the cable link 100. The other end of the coil spring 101 is locked to the cushion frame 3 side, and the memory shaft 96 is rotated in the rotation direction (counterclockwise rotation direction in FIG. 5) in which the trigger plate 71 integrated with the memory shaft 96 releases the memory operation. Is rotated and energized. The memory shaft 96 is normally biased and held by a coil spring 101 at a predetermined rotational position corresponding to a position where the trigger plate 71 releases the memory operation.

  Here, as shown in FIG. 7, the external teeth 44 and 47 of the poles 31 </ b> A to 31 </ b> C are in mesh with the internal teeth 22 of the upper arm 20, and the external teeth 79 of the memory plate 76 are the internal teeth 22 of the upper arm 20. 14 (a), the transmitted portion 93 of the connecting shaft 91 is in the circumferential direction, which is the longitudinal direction of the transmitting portion 99, when it is in a released state (hereinafter also referred to as “locked state”). It is arranged in the middle part. In this state, it is assumed that the connecting shaft 91 is rotated in the clockwise direction in the drawing in order to release the external teeth 44 and 47 of the poles 31A to 31C from the internal teeth 22 of the upper arm 20 via the cam 32 or the like. At this time, the transmitted portion 93 is set so as to run idly in the transmitting portion 99, so that the rotation is not transmitted from the connecting shaft 91 to the memory shaft 96.

  On the other hand, in the locked state, as shown in FIGS. 14 (b) and 14 (c), the memory shaft 96 is connected to the illustrated clock to engage the external teeth 79 of the memory plate 76 with the internal teeth 22 of the upper arm 20 via the trigger plate 71. Suppose that it is rotated in the rotation direction. At this time, as shown in FIG. 14B, the rotation is not transmitted from the memory shaft 96 to the connecting shaft 91 until the transmission portion 99 abuts on the transmitted portion 93. In the present embodiment, the rotation of the memory shaft 96 during this period is used to complete the engagement between the external teeth 79 of the memory plate 76 and the internal teeth 22 of the upper arm 20 via the trigger plate 71. . Then, as shown in FIG. 14B, when the memory shaft 96 is further rotated in the clockwise direction shown in the figure, the transmission portion 93 is pressed by the transmission portion 99 so that the connecting shaft 91 rotates integrally. . Thereby, the external teeth 44 and 47 of the poles 31 </ b> A to 31 </ b> C are released from the internal teeth 22 of the upper arm 20 through the cam 32 and the like. That is, after the external teeth 79 of the memory plate 76 are engaged with the internal teeth 22 of the upper arm 20, the external teeth 44 and 47 of the poles 31 </ b> A to 31 </ b> C are released from the internal teeth 22 of the upper arm 20. A structure that realizes such a function is also referred to as a lost motion mechanism.

  As shown in FIGS. 12 (a) and 12 (b), the distal end portion (fitting portion 92) of the connecting shaft 91 protruding in the axial direction from the lower plate 4 on one side on the back side frame 6b side is substantially made of a plate material. A bow-shaped first operation lever 61 is rotatably supported. The first operating lever 61 includes a pair of movable stoppers 61a and 61b that project around the connecting shaft 91 and project radially outward from locations separated from each other in the circumferential direction. The fixed flange 7 is arranged on a turning locus centering on the connecting shaft 91 of the movable stoppers 61a and 61b. Accordingly, the rotation operation range α of the first operating lever 61 includes a lock position (see FIG. 12A) where the movable stopper 61a contacts the fixed flange 7 and a release position where the movable stopper 61b contacts the fixed flange 7. (See FIG. 12B). A structure that realizes such a function is also referred to as an operation range limiting mechanism.

The first operation lever 61 is always urged to rotate (pulled) toward the lock position by a return spring 69 stretched between the first operation lever 61 and the lower plate 4.
On the other hand, as shown in FIG. 1, an erection member 6 c that extends in the width direction and is bridged in the direction is provided on the upper portion of the seat back frame 6. An arm-shaped second operation lever 62 made of a plate material is supported on the installation member 6c on the first operation lever 61 side in the width direction so as to be rotatable in the vertical direction by a shaft 63. The second operation lever 62 is always urged to rotate downward by a return spring 64. Further, stoppers 67a and 67b are provided on the upper side and the lower side of the second operation lever 62 in the installation member 6c, and the operation range of the second operation lever 62 is defined by these stoppers 67a and 67b.

  The second operation lever 62 is drivingly connected to the distal end portion of the cable link 100 via a cable 68, and the movement of the second operation lever 62 according to the operation of the second operation lever 62 is the cable 68 and the cable link. It is configured to be transmitted to the memory shaft 96 through 100. That is, as shown in FIG. 13, an arc-shaped locking hole 100 a centering on the axis of the memory shaft 96 is formed at the tip of the cable link 100. On the other hand, a cylindrical locking pin 68a that is slidably inserted in the longitudinal direction of the locking hole 100a is fixed to the end of the cable 68. 1 and 13, the intermediate portion of the cable 68 is not shown.

  When the distal end portion (the locking hole 100a) is pulled up via the cable 68 as the second operation lever 62 is operated, the distal end portion of the cable link 100 moves up against the biasing force of the coil spring 101. It rotates integrally with the memory shaft 96 around its axis. At this time, the above-described memory operation of the trigger plate 71 connected to the memory shaft 96 is performed.

  Further, when the operation force of the second operation lever 62 is released, the cable link 100 is urged by the coil spring 101 and tries to return to the original position. Therefore, if there is no rotation locking of the memory shaft 96 integrally with the trigger plate 71 due to the memory operation of the trigger plate 71, the cable link 100 is biased by the coil spring 101 and returns to the original position. . At the same time, the second operating lever 62 is also urged by the return spring 64 to return to the original position. Alternatively, when the memory plate 96 is rotated and locked together with the trigger plate 71 in accordance with the memory operation of the trigger plate 71, the cable link 100 returns to the original position even when the coil spring 101 is biased. There is nothing. However, the second operating lever 62 is urged by the return spring 64 and returns to the original position while sliding the locking pin 68a of the cable 68 within the range of play with the locking hole 100a.

  As shown in FIGS. 12 (a) and 12 (b), the fixed flange 7 is provided at the distal end portion (fitting portion 92) of the connecting shaft 91 protruding in the axial direction from the lower plate 4 on one side, which is the first operating lever 61 side. A link member 80 made of a plate material is connected so as to rotate integrally, adjacent to the outside of the first operation lever 61 on the lower side. That is, the link member 80 has a substantially oval fitting hole 80a penetrating along the rotation axis O1 at the tip thereof. The link member 80 is coupled so as to rotate integrally with the coupling shaft 91 by fitting the fitting portion 92 into the fitting hole 80a. An arc-shaped long hole 81 centering on the connecting shaft 91 is formed at the distal end of the link member 80. On the other hand, a pin 82 slidably inserted into the long hole 81 is fixed to the first operation lever 61.

  As described above, the first operation lever 61 is supported so as to be rotatable with respect to the distal end portion (fitting portion 92) of the connecting shaft 91, and is always urged to rotate toward the lock position by the return spring 69. ing. On the other hand, the link member 80 is normally locked because the cam 32 integral with the connecting shaft 91 is always urged to rotate in the rotation direction (clockwise rotation in FIG. 12) on the side where the cam spring 32 is locked. It is arranged at a position where one end (front end) of the long hole 81 is locked to the pin 82 of the first operating lever 61 at the position.

  Therefore, when the first operation lever 61 is operated, the link member 80 is integrated with the first operation lever 61 by pressing one end (front end) of the long hole 81 by the pin 82. It rotates in the counterclockwise direction of illustration. As the link member 80 rotates, the connecting shaft 91 rotates integrally in the same direction. Incidentally, the rotation operation range α of the first operation lever 61 is limited between the lock position and the release position by the operation range restriction mechanism described above. The rotation operation range α of the first operation lever 61 corresponds to a range in which the transmitted part 93 runs idle in the transmission part 99 when the connecting shaft 91 rotates through the link member 80 (FIG. 14). (See (a)). Thereby, when the connection shaft 91 rotates via the link member 80 in accordance with the operation of the first operation lever 61, the rotation is not transmitted from the connection shaft 91 to the memory shaft 96. Therefore, the cable link 100 does not rotate and the cable 68 does not bend, and naturally the rotation at this time is not transmitted to the second operation lever 62. Accordingly, the second operation lever 62 can be kept stopped when the first operation lever 61 is operated.

  On the other hand, when the second operation lever 62 is operated, the cable shaft 100 is pulled up via the cable 68, whereby the memory shaft 96 is rotated. At this time, when the connecting shaft 91 rotates together with the memory shaft 96 in the counterclockwise direction shown in the drawing with a slight timing delay, the link member 80 rotates together in the same direction. In this case, since the movement of the pin 82 within the long hole 81 is allowed, the rotation of the link member 80 is not transmitted to the first operation lever 61. Accordingly, the first operation lever 61 can be kept stopped when the second operation lever 62 is operated.

  That is, the first operation lever 61 and the second operation lever 62 are configured so that their operations are independent of each other, although the common connection shaft 91 is rotated by each operation. As a result, for example, an unnatural operation such as swinging of the second operation lever 62 when the first operation lever 61 is operated in order to allow tilting of the seat back without storing the angular position is eliminated. Similarly, an unnatural operation such as swinging of the first operation lever 61 when the second operation lever 62 is operated to allow the seat back to tilt while storing the angular position is also eliminated.

Next, the operation of this embodiment will be described.
First, as shown in FIGS. 5 and 7A and 7B, the external teeth 44 and 47 of the poles 31A to 31C are engaged with the internal teeth 22 of the upper arm 20, and the external teeth of the memory plate 76 are used. It is assumed that 79 is in a locked state released from the inner teeth 22 of the upper arm 20. At this time, the rotation of the upper arm 20 relative to the lower arm 10 is restricted, and the rotation of the seat back relative to the seat cushion is restricted (locked).

  In this state, when the first operation lever 61 is operated to rotate from the lock position to the release position, the rotation is transmitted to the cam 32 via the link member 80 and the connecting shaft 91. As a result, as shown in FIGS. 8A and 8B, the cam 32 and the release plate 33 integrally rotate in the unlocking rotation direction (clockwise rotation direction in the drawing) against the urging force of the spiral spring 34. The cam surface 55 of the cam 32 (pressing cam portions 55a to 55c), the pole side cam surfaces 50a to 50c of the pole 31A, the pole side cam surfaces 51a to 51c of the pole 31B, and the pole side cam surfaces 51a and 51b of the pole 31C. And the contact with the pressing member 35 is released. Then, due to the engaging action of the pole-side groove cam portion 46 of the pole 31A and the engaging projection 57 of the cam 32, the pole 31A is drawn toward the rotation axis O1 along the guide walls 13 and 14, and the external teeth 44 of the pole 31A are drawn. And the meshing state of the internal teeth 22 are released. At the same time, the pawls 31B and 31C are attracted to the rotating shaft O1 side along the guide walls 13 and 14 by the engaging action of the engaging projections 49 of the pawls 31B and 31C and the release plate side groove cam portion 59. The meshing state of the outer teeth 47 and the inner teeth 22 of 31C is released. Accordingly, the locking of the relative rotation of the lower arm 10 and the upper arm 20 is released, and the rotation of the seat back with respect to the seat cushion is permitted (unlocked).

  Note that, in the rotation operation range α of the first operation lever 61 restricted by the operation range restriction mechanism described above, the engaging portion 43 of the upper arm 20 is engaged even when the pole 31A is pulled toward the rotation axis O1. It is set so as to block the rotation trajectory of the protrusion 24. Therefore, when the upper arm 20 is rotated in the counterclockwise direction shown in the drawing, the rotation is locked by the protrusion 24 coming into contact with the engaging portion 43 as shown in FIG. The rotation direction of the upper arm 20 at this time coincides with the direction in which the seat back is tilted forward, and the rotation position when the protrusion 24 abuts the engagement portion 43 corresponds to the upright position of the seat back. That is, when the first operating lever 61 is operated, the rotation is allowed only in the seating area of the seat back (seat back frame 6). This is because when the first operation lever 61 is operated, the seat back (seat back frame 6) enters the forward tilted area, and the seat back cannot be locked even if the operation force of the first operation lever 61 is released. This is to avoid it.

  Thereafter, when the operating force of the first operating lever 61 is released, the cam 32 is urged to rotate in the lock rotation direction (counterclockwise rotation direction in the drawing) by the spiral spring 34, and the cam surface 55 (pressing force) of the cam 32 is pressed. Cam portions 55a to 55c), the pole side cam surfaces 50a to 50c of the pole 31A, the pole side cam surfaces 51a to 51c of the pole 31B, the pole side cam surfaces 51a and 51b of the pole 31C, and the pressing member 35 are in contact with each other. And pole 31A-31C is pressed to radial direction outward. As a result, the outer teeth 44 and 47 of the poles 31A to 31C mesh with the inner teeth 22 of the upper arm 20, and the rotation of the upper arm 20 with respect to the lower arm 10 is restricted, and the rotation of the seat back with respect to the seat cushion is restricted (locked). ) At the same time, the first operation lever 61 is biased by the return spring 69 and rotates from the release position to the lock position.

As described above, in the seating area of the seat back (seat back frame 6), the seat back can be adjusted and held at a required inclination angle suitable for occupant seating or the like.
In these cases, the rotation of the connecting shaft 91 is not transmitted to the memory shaft 96 by the above-described lost motion mechanism, so that the trigger plate 71 fixed to the memory shaft 96 does not rotate. Instead, the external teeth 79 of the memory plate 76 connected to the trigger plate 71 remain released from the internal teeth 22 of the upper arm 20. Accordingly, when the lower arm 10 and the upper arm 20 are rotated relative to each other, the memory plate 76 is not fixed to the upper arm 20 and remains connected to the trigger plate 71, so that the lower arm 10 and the lower arm 10 are not affected by relative rotation. There is no displacement with respect to. In addition, there is no unnatural operation that the second operation lever 62 swings when the first operation lever 61 is operated.

  Further, when the memory shaft 96 is rotated via the cable 68 and the cable link 100 by operating the second operation lever 62 in the locked state, as shown in FIG. The first and second switching cam projections 77 and 78 of the memory plate 76 guided by the first and second switching cam surfaces 72 and 73 by the memory operation accompanying the rotation in the clockwise direction) are cam groove surfaces 72a. , 73a. In the memory plate 76, the tip portion on the first switching cam projection 77 side is pushed outward in the radial direction, and the tip portion on the second switching cam projection 78 side is drawn inward in the radial direction. As a result, the memory plate 76 is locked to the inner teeth 22 (upper arm 20) when the outer teeth 79 mesh with the inner teeth 22. At this time, the memory cam surface 76a of the memory plate 76 is set to extend along an arc centered on the rotation axis O1.

  If the outer teeth 47 and the inner teeth 22 of the poles 31B and 31C are still engaged, the memory plate 76 is still in contact with the two engaging projections 49B and 49C on both sides in the circumferential direction. Movement in the direction remains restricted. On the other hand, when the rotation transmission from the memory shaft 96 to the connecting shaft 91 is started and the cam 32 and the release plate 33 are turned in the unlocking rotation direction (clockwise direction in the drawing) as shown in FIG. The engagement between the outer teeth 44 and 47 of the poles 31A to 31C and the inner teeth 22 is released. At this time, the memory plate 76 disengages the engaging protrusion 49C of the pole 31C from the side surface on the side and releases the circumferential movement trajectory of the engaging protrusion 49C of the pole 31C on the memory cam surface 76a. Is allowed to rotate in the counterclockwise direction shown in the figure. The rotation direction of the upper arm 20 at this time coincides with the direction in which the seat back is tilted forward.

  Accordingly, when the upper arm 20 rotates in the counterclockwise direction shown in the figure, the memory plate 76 slides the first and second switching cam projections 77 and 78 on the first and second switching cam surfaces 72 and 73. While rotating integrally with the upper arm 20. At this time, the pawl 31 </ b> C is engaged with the outer teeth 47 and the inner teeth 22 by the movement of the engagement protrusions 49 </ b> C sliding on the memory cam surface 76 a of the memory plate 76 in the radial direction. It remains unlocked. Due to the rotation locking of the release plate 33 and the cam 32 accompanying the movement locking of the pole 31C, the other pawls 31A, 31B also remain disengaged from the outer teeth 44, 47 and the inner teeth 22. On the other hand, the memory plate 76 remains engaged with the outer teeth 79 and the inner teeth 22 because the movement toward the radially inner side is stopped on the memory cam surface 76a on which the engaging protrusion 49C slides. Along with this, the trigger plate 71 also remains rotationally locked in the memory operating state. Therefore, even if the operating force of the second operating lever 62 (and the operating force for unlocking the cam 32) is released, all the external teeth 44 and 47 of the poles 31A to 31C are applied to the internal teeth 22 of the upper arm 20. The seat back (seat back frame 6) is always kept tiltable without engaging.

  When the second operation lever 62 is operated, when the pole 31A is pulled toward the rotation axis O1 via the memory shaft 96 or the like, the engaging portion 43 releases the rotation locus of the protrusion 24 of the upper arm 20. It is set to be. As the memory plate 76 integrated with the upper arm 20 rotates in the counterclockwise direction shown in FIG. 11, the first and second switching cam surfaces 72 and 73 slide on the first and second switching cam surfaces 72 and 73 as shown in FIG. When the switching cam projections 77 and 78 reach the vicinity of their terminal ends, the engaging portion 43 of the pole 31A rides on the projection 24 of the upper arm 20. As a result, the movement of the pole 31 </ b> A toward the outside in the radial direction is stopped, and the meshing between the outer teeth 44 and the inner teeth 22 remains released. As described above, the tilting region of the seat back (seat back frame 6) corresponding to the rotation range of the upper arm 20 at this time coincides with the forward tilting region.

  When the tilting region of the seat back (seat back frame 6) reaches the forward tilting region, the slide lock device is released by the aforementioned walk-in mechanism. Accordingly, the seat cushion slides forward with respect to the vehicle floor in conjunction with the forward tilt of the seat back (seat back frame 6).

  Thereafter, when the seat back (seat back frame 6) is erected and the upper arm 20 is rotated in the clockwise direction in the drawing from the state in which the engaging portion 43 of the pole 31A rides on the protrusion 24 of the upper arm 20, the memory plate 76 is The first and second switching cam protrusions 77 and 78 rotate integrally with the upper arm 20 while sliding on the first and second switching cam surfaces 72 and 73. Needless to say, the rotation direction of the upper arm 20 at this time coincides with the direction in which the seat back is tilted rearward. Also at this time, the pawl 31 </ b> C is kept from being disengaged from the outer teeth 47 and the inner teeth 22 by being locked in the radially outward movement in the above-described manner. The other poles 31A and 31B also remain disengaged from the outer teeth 44 and 47 and the inner teeth 22. Further, the memory plate 76 remains engaged with the outer teeth 79 and the inner teeth 22, and accordingly, the trigger plate 71 remains rotationally locked in the memory operating state.

  That is, if the upper arm 20 is in a rotation range corresponding to the forward tilting region of the seat back from the rotation position immediately before the memory operation, even if the operation force of the second operation lever 62 is released, the upper arm 20 is integrated with the memory plate 76. Forward and reverse rotation is allowed.

  When the upper arm 20 reaches the original rotational position immediately before the memory operation, the engaging protrusion 49C of the pole 31C is disengaged from the memory cam surface 76a of the memory plate 76 as shown in FIG. The movement locking to the radially outer side is released together with 31B. Therefore, the external teeth 44 and 47 of the poles 31 </ b> A to 31 </ b> C that are pressed outward by the cam 32 and the release plate 33 urged by the spiral spring 34 in the lock rotation direction (counterclockwise rotation direction in the drawing) are applied to the internal teeth 22. The rotation of the upper arm 20 is locked again. That is, the rotation of the seat back (seat back frame 6) is again restricted (locked) at the original angular position immediately before the memory operation. At this time, the first and second switching cam protrusions 77 and 78 of the memory plate 76 are disposed in the vicinity of the cam groove surfaces 72a and 73a.

  Subsequently, when the trigger plate 71 rotates together with the cable link 100 and the memory shaft 96 urged to rotate by the coil spring 101 in the counterclockwise direction shown in the drawing, the first and second switching cam surfaces 72 and 73 are guided. The first and second switching cam protrusions 77 and 78 of the memory plate 76 enter the cam groove surfaces 72a and 73a. In the memory plate 76, the tip portion on the first switching cam projection 77 side is drawn inward in the radial direction, and the tip portion on the second switching cam projection 78 side is pushed outward in the radial direction. It goes without saying that the operation of the memory plate 76 at this time is a rotation about the above-mentioned axis that is shifted parallel to the outside of the seat reclining device 5 with respect to the rotation axis O1. As a result, as shown in FIG. 7A, the memory plate 76 is released from the upper arm 20 by releasing the mesh of the outer teeth 79 with the inner teeth 22. Then, the locked state immediately before the memory operation is restored.

  By the way, when the memory of the trigger plate 71 is activated, the memory shaft 96 is also rotationally locked together with the trigger plate 71 that is rotationally locked in the memory operating state. When the force is released, the cable 68 is bent and is urged by the return spring 64 to return to the original position. In addition, when the memory of the trigger plate 71 is activated, the connecting shaft 91 rotates with this, but there is no unnatural operation such that the first operating lever 61 swings in the above-described manner.

  In particular, the memory plate 76 is arranged at a position different from the positions of the external teeth 44 (first block 41) of the pole 31A and the external teeth 47 of the poles 31B and 31C in the axial direction. It is possible to avoid limiting the number of poles that can be installed. Further, when the trigger plate 71 is in memory operation, the engaging protrusion 49C of the pawl 31C has a memory cam surface 76a formed as a continuous surface on the memory plate 76 when the pawl 31C is stopped from moving radially outward. Since it slides, it can suppress that sliding of the engaging protrusion 49C is inhibited at the time of relative rotation of the lower arm 10 and the upper arm 20.

  A part of the trigger plate 71 (part on the side rotating in the clockwise direction in the figure) protrudes so as to block the rotation locus of the protrusion 24, but the tilt area (sitting) of the seat back (seat back frame 6). In the region and the forward tilted region), the first switching cam surface 72 can be opposed in the radial direction so that interference with the protrusion 24 can be avoided. Similarly, the rotation trajectory of the memory plate 76 that rotates integrally with the upper arm 20 is blocked by the engaging portion 43 of the pole 31A, but in the tilting area (sitting area and forward tilting area) of the seat back (seat back frame 6). The circumferential length of the memory plate 76 is set so that interference with the engaging portion 43 can be avoided.

As described above in detail, according to the present embodiment, the following effects can be obtained.
(1) In the present embodiment, the memory plate 76 is disposed at a position different from the positions of the external teeth 44 and 47 of the plurality of poles 31A to 31C in the axial direction. It is possible to avoid limiting the number of possible. Thereby, the number of poles that can ensure sufficient lock strength can be provided without increasing the size of the entire apparatus. Thus, sufficient lock strength can be ensured while adding the memory function of the inclination angle of the seat back.

  Further, when the lower arm 10 and the upper arm 20 are rotated relative to each other when the trigger plate 71 is operated in memory, the engagement protrusion 49C of the pole 31C is attached to the memory plate 76 when the movement of the pole 31C in the radially outward direction is locked. The memory cam surface 76a formed as a continuous surface slides. For this reason, it is possible to suppress the sliding of the engaging protrusion 49C of the pole 31C from being inhibited during the relative rotation of the lower arm 10 and the upper arm 20 accompanying the memory operation, that is, when the seat back is tilted.

  (2) In this embodiment, when the trigger plate 71 is in memory operation, the memory plate 76 is formed by the pair of first and second switching cam protrusions 77 and 78 by the pair of first and second switching cam surfaces 72 and 73. The guide is fixed to the upper arm 20 in a more stable state, and the lower arm 10 and the upper arm 20 are allowed to rotate relative to each other while being fixed. Therefore, the posture of the memory plate 76 at this time can be further stabilized.

  (3) In this embodiment, when the memory of the trigger plate 71 is in operation, the memory plate 76 rotates about an axis that is shifted parallel to the outside of the seat reclining device 5 with respect to the axis (rotation axis O1) of the trigger plate 71. Then, it is fixed to the upper arm 20. Therefore, the memory plate 76 can set the rotation amount (movement amount) in a relationship proportional to the rotation amount of the trigger plate 71. Thereby, even if the rotation amount of the trigger plate 71 is small, the memory plate 76 can be more securely fixed to the upper arm 20 by increasing the rotation amount of the memory plate 76 proportionally. Accordingly, for example, when the memory of the trigger plate 71 is operated, after the memory plate 76 is fixed to the upper arm 20, the cam 32 and the like are unlocked, and the external teeth 44 and 47 and the internal teeth 22 of the plurality of poles 31A to 31C are operated. Can be released.

  Further, unlike the conventional example (Patent Document 2), the memory plate 76 does not move in the radial direction when the trigger plate 71 is in memory operation, so that the outer teeth 79 can be smoothly meshed with the inner teeth 22. .

  (4) In the present embodiment, during the memory operation of the trigger plate 71, the memory plate 76 causes the axis (rotation axis O1) of the trigger plate 71 to be aligned by the engagement protrusion 49C of the pole 31C and the engagement protrusion 49B of the pole 31B. It moves in a state sandwiched in the circumferential direction as the center and is fixed to the upper arm 20. Therefore, it is possible to prevent the memory plate 76 from being displaced in the circumferential direction around the axis (rotation axis O1) of the trigger plate 71 until the memory plate 76 is fixed to the upper arm 20.

  (5) In the present embodiment, the engaging protrusion 49C that locks the radially outward movement of the pole 31C during the relative rotation of the lower arm 10 and the upper arm 20 accompanying the memory operation of the trigger plate 71 is released during the unlocking operation. It is also used as an engaging protrusion 49 that engages with the plate 33. Therefore, it is not necessary to separately provide the engaging protrusions having these functions on the pole 31C, so that the structure of the pole can be further simplified.

  (6) In the present embodiment, the memory cam surface 76a of the memory plate 76 fixed to the upper arm 20 is set so as to extend along an arc centered on the rotation axis O1 when the trigger plate 71 is in memory operation. Therefore, the sliding of the engaging protrusion 49C during relative rotation of the lower arm 10 and the upper arm 20 can be made smoother.

  (7) In this embodiment, a lost motion mechanism installed between the connecting shaft 91 and the memory shaft 96 causes the external teeth 79 of the memory plate 76 to mesh with the internal teeth 22 of the upper arm 20 when the trigger plate 71 is in memory operation. After that, the external teeth 44 and 47 of the poles 31 </ b> A to 31 </ b> C can be released from the internal teeth 22 of the upper arm 20.

  (8) In the present embodiment, the seat back (seat back frame 6) enters the forward tilting region when the first operation lever 61 is operated by the operation range limiting mechanism installed between the fixed flange 7 and the first operation lever 61. Can be avoided.

In addition, you may change the said embodiment as follows.
In the embodiment, when the memory of the trigger plate 71 is operated, the memory plate 76 is fixed to the upper arm 20 by meshing with the engaging portion other than the inner teeth 22 separately provided on the upper arm 20 at the outer teeth 79 thereof. Also good. In this case, the memory plate 76 (external teeth 79) or the like may be accommodated in other than the recess 21 (for example, the recess 23) as long as it is in the upper arm 20. The memory plate 76 may be fixed to the upper arm 20 with an engagement structure other than meshing (for example, hooking).

  In the embodiment, the arrangement relationship between the trigger plate 71 and the memory plate 76, the first and second switching cam surfaces 72 and 73, and the first and second switching cam protrusions 77 and 78 may be opposite to each other. Good.

  In the embodiment, the switching cam surface provided on one of the trigger plate 71 and the memory plate 76 and the switching cam protrusion provided on the other of the trigger plate 71 and the memory plate 76 are each one. Or three or more. Further, the switching cam surface that guides the switching cam protrusion is not necessarily formed into a hole shape or a concave shape as long as it is a step in the plate thickness direction (axial direction of the rotation axis O1).

  In the embodiment, the number of poles is arbitrary as long as it is plural, and an appropriate number may be adopted according to the required lock strength. Further, the plurality of poles may all have the same shape.

  The present invention may be embodied in a vehicle seat device that does not include a walk-in mechanism.

  DESCRIPTION OF SYMBOLS 10 ... Lower arm (1st member), 15 ... Guide groove, 20 ... Upper arm (2nd member), 22 ... Internal tooth, 31A-31C ... Pole, 32 ... Cam (cam body), 33 ... Release plate (cam body) 34 ... spiral spring (biasing member), 44, 47 ... external teeth, 49B ... engagement projection (guide projection), 49C ... engagement projection (sliding projection), 71 ... trigger plate (switching member) , 72 ... 1st switching cam surface (switching cam surface), 73 ... 2nd switching cam surface (switching cam surface), 76 ... Memory plate (memory member), 76a ... Memory cam surface, 77 ... 1st switching cam protrusion (Cam protrusion), 78... Second switching cam protrusion (cam protrusion).

Claims (4)

A first member fixed to either the seat cushion side or the seat back side;
A second member fixed to one of the seat cushion side and the seat back side and rotatably supported by the first member;
A plurality of poles having outer teeth that are guided in movement in the radial direction by a plurality of guide grooves provided in the first member, and that can be engaged with and disengaged from the inner teeth provided in the second member;
The first member is pivotally provided, and when the unlocking operation is accompanied by the pivoting in one direction, the plurality of poles are pulled inward to release the external teeth from meshing with the internal teeth, A cam body that presses the plurality of poles outward at the time of locking operation accompanying rotation in a direction to mesh the outer teeth with the inner teeth;
An urging member that urges the cam body to rotate toward the locking side;
The first member is pivotably provided so as to be released from the rotation transmission from the cam body during the unlocking operation and to unlock the cam body during the memory operation accompanying the rotation in one direction. A switching member linked to the cam body and having one of a switching cam surface and a switching cam protrusion guided by the switching cam surface;
It is arranged at a position different from the position of the external teeth of the plurality of poles in the axial direction, and has one of the switching cam surface and the switching cam protrusion and is connected to the switching member, A memory member that is fixed to the second member by guiding the switching cam projection by the switching cam surface when the memory is activated, and that allows relative rotation of the first member and the second member in the fixed state;
One of the plurality of poles includes a sliding protrusion that protrudes in the axial direction facing the memory member,
The memory member releases the circumferential movement trajectory of the sliding protrusion when the cam body is unlocked by the memory operation of the switching member, and the first member and the first member integrated with the memory member are opened. slide the slide protrusions upon relative rotation of the two members said outer teeth have a Memorikamu surface for locking the movement of the pole to the side which meshes with said teeth,
Each of the switching cam surface and the switching cam projection is disposed in a pair at different positions, and the vehicle seat reclining device is characterized in that The vehicle seat reclining device according to claim 1 ,
The seat reclining device for a vehicle, wherein when the memory of the switching member is operated, the memory member is fixed to the second member by rotating about an axis that is parallel to the axis of the switching member. . In the vehicle seat reclining device according to claim 1 or 2 ,
The sliding protrusion is in contact with one side surface in the circumferential direction around the axis of the switching member of the memory member that moves with the memory operation of the switching member,
The axis of the switching member of the memory member that protrudes in the axial direction opposite to the memory member and moves in accordance with the memory operation of the switching member is formed on one of the poles that is not projected from the sliding protrusion. A vehicle seat reclining device comprising a guide projection that abuts the other circumferential side surface as a center. In the vehicle seat reclining device according to any one of claims 1 to 3 ,
The vehicle seat reclining device, wherein the sliding protrusion is also used as an engaging protrusion protruding from the pole so as to be engaged with the cam body during unlocking operation.