JP2015223444A - Reclining mechanism - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a reclining mechanism capable of inhibiting enlargement in the radial direction.SOLUTION: A reclining mechanism 1 includes: a base plate 10; an internal gear 60 capable of rotationally turning with respect to the base plate 10; a lock gear 20 capable of rotationally turning between a lock attitude engaged with the internal gear 60 and a release attitude removed from the internal gear 60; and a slide cam 30 pressing the lock gear 20 to make the lock gear 20 the lock attitude or release attitude. The base plate 10 includes a support protrusion 15 protruding from a base part 11, and the lock gear 20 includes a first lock gear 20A and a second lock gear 20B. The support protrusion 15 has a first gear support surface 15A that comes into contact with a side face constituting a profile of the first lock gear 20A to receive a load in the rotational direction of the internal gear 60, and a second gear support surface 15B that comes into contact with a side face constituting a profile of the second lock gear 20B to receive a load in the rotational direction of the internal gear 60.

Description

  The present invention relates to a reclining mechanism for adjusting an inclination angle of a seat back with respect to a seat cushion.

  Conventionally, as a reclining mechanism, a base plate fixed to the seat back, an internal gear fixed to the seat cushion and rotatable with respect to the base plate, a locking posture meshing with the internal gear, and a releasing posture separated from the internal gear There is known one provided with a plurality of lock gears that rotate between and a cam that presses each lock gear toward a lock posture (see Patent Document 1).

  In this technique, one guide protrusion is provided on the inner surface of the base plate corresponding to each lock gear, and each guide protrusion is in contact with the side surface of the corresponding lock gear in the rotational direction of the internal gear. An arcuate gear support surface for receiving a load is provided.

JP 2002-521165 A

  By the way, in the conventional structure, since the guide protrusion part which has a gear support surface was provided 1 each with respect to each lock gear, there exists a problem that a reclining mechanism enlarges because a baseplate enlarges.

Then, an object of this invention is to provide the reclining mechanism which can suppress an enlargement.
Another object of the present invention is to stably support a lock gear.
Another object of the present invention is to improve positioning accuracy with respect to a seat cushion or a seat back.
Another object of the present invention is to increase the rigidity of the base plate.

  The present invention for achieving the above object is a reclining mechanism for adjusting an inclination angle of a seat back with respect to a seat cushion, the base plate being fixed to one of the seat cushion and the seat back, and the seat cushion. And can be rotated between an internal gear fixed to the other side of the seat back and rotatable with respect to the base plate, a locking posture engaging with the internal gear, and a releasing posture released from the internal gear. A plurality of lock gears rotatably supported by the base plate and displaceably supported by the base plate, and by pressing the lock gears, the lock gears are brought into the lock posture or the release posture. And the base plate has the cam A base portion facing each of the lock gears in the rotational axis direction of the internal gear, and a support convex portion protruding from the base portion toward the lock gear, wherein the plurality of lock gears include a first lock gear and a second lock gear, The support convex portion is in contact with a side surface of the first lock gear as viewed from the rotation axis direction and configured to contact a side surface of the wheel so as to receive a load in the rotation direction of the internal gear, and the second gear support surface. And a second gear support surface that receives a load in the rotation direction of the internal gear in contact with the side surface of the lock gear as viewed from the rotation axis direction.

  According to such a configuration, since the first gear support surface that receives the load from the first lock gear and the second gear support surface that receives the load from the second lock gear are provided on one support convex portion, Compared with the prior art, the number of supporting convex portions can be reduced. Thereby, since the enlargement of a baseplate can be suppressed, the enlargement of a reclining mechanism can be suppressed.

  In the reclining mechanism described above, the first gear support surface and the first contact surface that contacts the first gear support surface of the first lock gear rotate the first lock gear when viewed from the rotation axis direction. The second gear support surface and the second contact surface that comes into contact with the second gear support surface of the second lock gear are formed in an arc shape centering on the center, and the second contact surface when viewed from the rotation axis direction. The first gear support surface is disposed on one side of the support convex portion in the rotation direction of the internal gear, and the second gear support surface is formed. Can be configured to be disposed on the other side of the support convex portion in the rotation direction of the internal gear.

  According to this, the contact surface that contacts the gear support surface and the gear support surface of the lock gear is formed in an arc shape, and the gear support surfaces are respectively disposed on both sides of the support convex portion in the rotation direction of the internal gear. Since the load is applied from both sides in the rotation direction, the lock gear can be stably supported.

  In the reclining mechanism described above, the base plate has a positioning protrusion that protrudes from the base to the side opposite to the lock gear side for determining the position of the base plate with respect to one of the seat cushion and the seat back, The positioning convex portion can be configured to be disposed adjacent to the support convex portion when viewed from the rotational axis direction.

  According to this, since the positioning convex part is arrange | positioned near the part with high rigidity in which the support convex part was provided, the positioning precision with respect to a seat cushion or a seat back can be improved. Further, since the support convex portions provided close to each other protrude to the lock gear side and the positioning convex portions protrude to the side opposite to the lock gear side, the rigidity of the base plate in the vicinity of the support convex portion can be increased.

  In the reclining mechanism described above, a plurality of the positioning protrusions may be provided, and the support protrusions may be arranged on a straight line connecting adjacent positioning protrusions when viewed from the rotation axis direction. .

  According to this, since the positioning convex portions projecting on the opposite side to the lock gear side are disposed adjacent to both sides of the support convex portion projecting to the lock gear side, the rigidity of the base plate can be further increased.

  In the reclining mechanism described above, the cam is slidably supported on the base plate, and the base plate is disposed so as to protrude from the base and sandwich the cam in an orthogonal direction orthogonal to the moving direction of the cam, A pair of cam guide portions for guiding the movement of the cam, wherein the first lock gear and the second lock gear are formed in an elongated shape extending along a circumferential direction of the internal gear, and the pair of cam guide portions The support convex portion is disposed between one end portion in the circumferential direction of the first lock gear and one end portion in the circumferential direction of the second lock gear in the orthogonal direction, and the first lock gear. One end portion in the circumferential direction of the second projection extends between the support convex portion and one of the pair of cam guide portions, and the circumference of the second lock gear One end of the direction can be configured to extend between the support protrusions and the other of the pair of cam guide portion.

  According to this, since the one end portion of the lock gear is disposed between the support convex portion and the cam guide portion, the lock gear can be stably supported.

  In the reclining mechanism described above, the base portion may have a through hole, and the pair of cam guide portions may be arranged so as to sandwich the through hole.

  According to this, since the through hole is arranged between the portions with high rigidity protruding from the base portion, the rigidity of the base plate can be increased.

  In the reclining mechanism, the first gear support surface is disposed on one side of the support convex portion in the rotation direction of the internal gear, and the second gear support surface is the rotation direction of the internal gear. The support projection is formed in a shape in which the width of the center portion in the radial direction of the circle centering on the rotation center of the internal gear is smaller than the width of both ends. It can be set as the structure currently made.

  According to this, the gear support surfaces are respectively arranged on both sides of the support convex portion in the rotation direction of the internal gear so that a load is applied from both sides in the rotation direction, and the gear support surface is arranged at the center portion. Since it can be set as the continuous surface of the shape dented rather than both ends, a lock gear can be supported stably.

  According to the present invention, an increase in the size of the reclining mechanism can be suppressed.

  Further, according to the present invention, the contact surface that contacts the gear support surface and the gear support surface of the lock gear is formed in an arc shape, and the gear support surfaces are arranged on both sides of the support convex portion in the rotation direction of the internal gear. By applying a load from both sides in the rotational direction, the lock gear can be stably supported.

  In addition, according to the present invention, the positioning convex portion that protrudes on the side opposite to the lock gear side is provided adjacent to the support convex portion, whereby the positioning accuracy with respect to the seat cushion or the seat back can be improved. Further, the rigidity of the base plate can be increased.

  Further, according to the present invention, the rigidity of the base plate can be further increased by providing a plurality of positioning protrusions and arranging the support protrusions on a straight line connecting adjacent positioning protrusions.

  Further, according to the present invention, the lock gear can be stably supported by providing the lock gear such that one end portion is sandwiched between the support convex portion and the cam guide portion.

  Further, according to the present invention, the rigidity of the base plate can be increased by providing the pair of cam guide portions so as to sandwich the through hole of the base portion.

  Further, according to the present invention, the gear support surfaces are arranged on both sides of the support protrusion in the rotation direction of the internal gear so that a load is applied from both sides of the rotation direction, and the support protrusion is attached to the rotation of the internal gear. The lock gear can be stably supported by forming the central portion in the radial direction of the circle centering on the center of movement in a shape in which the width of the central portion is smaller than the width of both end portions.

1 is a side view of a vehicle seat provided with a reclining mechanism according to an embodiment of the present invention. It is a disassembled perspective view of a reclining mechanism. It is sectional drawing which looked at the base plate, the internal gear, the lock gear, and the slide cam from the facing part side of the internal gear. It is a perspective view of a base plate and a slide cam. It is a figure (a) and (b) which show the function of a base side rotation control convex part and a gear side rotation control convex part. It is the perspective view which looked at the base plate from the outside. It is the perspective view which looked at the internal gear from the inside. It is sectional drawing which looked at the reclining mechanism from the base side of the base plate. It is sectional drawing which cut | disconnected the reclining mechanism by the surface orthogonal to an up-down direction. It is sectional drawing of the reclining mechanism of a locked state. It is sectional drawing of the reclining mechanism of a cancellation | release state. It is an expanded sectional view which cut a pair of cam guide part neighborhood of a reclining mechanism concerning the 1st modification with a field which intersects perpendicularly in the up-and-down direction. It is sectional drawing which looked at the reclining mechanism which concerns on a 2nd modification from the base part side of the baseplate.

  Hereinafter, an embodiment of the present invention will be described with reference to the drawings. In the present invention, front and rear, left and right, and top and bottom are based on the occupant sitting on the vehicle seat S provided with the reclining mechanism 1 according to the embodiment.

  As shown in FIG. 1, the reclining mechanism 1 is a mechanism for adjusting the inclination angle of the seat back S2 with respect to the seat cushion S1 of the vehicle seat S, and is provided on one side of the rear portion of the seat cushion S1 in the left-right direction. Yes. In the present embodiment, the reclining mechanism 1 is provided on the right side of the seat cushion S1.

  The seat cushion S1 has a pair of cushion side frames F1 that are spaced apart from each other on the left and right, and the seat back S2 has a pair of back side frames F2 that are spaced apart from each other on the left and right. The lower end portion of each back side frame F2 overlaps with the rear end portion of the corresponding cushion side frame F1 when viewed from the left-right direction, and is disposed on the inner side in the left-right direction than the rear end portion of the cushion side frame F1. The reclining mechanism 1 is provided between the rear end portion of the right cushion side frame F1 and the lower end portion of the right back side frame F2.

  As shown in FIG. 2, the reclining mechanism 1 includes a base plate 10, two lock gears 20, a slide cam 30 as a cam, an operation member 40, an urging member 50, an internal gear 60, and a ring 70. It is mainly prepared.

  The base plate 10 is fixed to a cushion side frame F1 (see FIG. 1) constituting the seat cushion S1. The internal gear 60 is rotatably supported with respect to the base plate 10 via a ring 70, is fixed to a back side frame F2 (see FIG. 1) constituting the seat back S2, and rotates together with the seat back S2. It comes to move.

  The rotation of the internal gear 60 relative to the base plate 10 is restricted or permitted by the lock gear 20 that is operated by the slide cam 30 or the like. Thereby, it is possible to restrict or allow the tilt of the seat back S2 with respect to the seat cushion S1. Hereinafter, the configuration of each member will be described in detail.

  The base plate 10 includes a disk-shaped base portion 11, an annular outer peripheral wall portion 12 extending leftward from the outer peripheral portion of the base portion 11, and a pair of cam guide portions 13 protruding leftward from the base portion 11 (on the lock gear 20 side). A pair of shaft support portions 14, a support convex portion 15, a plurality of load receiving portions 16, and an engaged portion 17 provided on the base portion 11 are provided.

  The base portion 11 is a portion facing each lock gear 20 and the slide cam 30 in the left-right direction (in the rotational axis direction of the internal gear 60), and has a through hole 11B penetrating in the left-right direction at the center viewed from the left-right direction. doing. The through hole 11B is a hole through which a rotation shaft 91 (see FIG. 5) of an operation lever (not shown) that rotates the operation member 40 is inserted.

  The pair of cam guide portions 13 are portions for guiding the movement of the slide cam 30, and as shown in FIG. 3, the rotation center of the internal gear 60 and the operation member 40 (see FIG. 2) is seen from the left and right directions. They are provided symmetrically with respect to a straight line L1 passing through C and parallel to the vertical direction (the moving direction of the slide cam 30). Specifically, the pair of cam guide portions 13 are arranged so as to sandwich the through hole 11B and the slide cam 30 in the front-rear direction (the orthogonal direction orthogonal to the moving direction of the slide cam 30). The slide cam 30 has a slide cam guide surface 13A that faces the slide cam 30 in the front-rear direction and supports the slide cam 30 so as to be slidable in the vertical direction. Since the pair of cam guide portions 13 are disposed so as to sandwich the through hole 11B, the through hole 11B is disposed between the portions having high rigidity protruding from the base portion 11. Stiffness can be increased.

  As shown in FIG. 4, each cam guide portion 13 has a base side rotation restricting convex portion 13 </ b> B and an adjacent convex portion 13 </ b> C projecting to the left side (the facing portion 61 side of the internal gear 60) on the left side surface. ing.

  As shown in FIGS. 5A and 5B, the base side rotation restricting convex portion 13B is a gear when the gear side rotation restricting convex portion 63 (see also FIG. 7) of the internal gear 60 comes into contact. By restricting the movement of the side rotation restricting convex portion 63, it is a part that restricts the amount of rotation of the internal gear 60. By having such a base side rotation restricting convex portion 13B and a gear side rotation restricting convex portion 63, the vehicle seat S restricts the tilting amount of the seat back S2 that rotates together with the internal gear 60. It is possible.

  The adjacent convex portion 13C is disposed adjacent to the base-side rotation restricting convex portion 13B in the rotational direction of the internal gear 60. More specifically, the adjacent convex portion 13C has a base side rotation restricting convex portion with a predetermined space between the adjacent convex portion 13C and the base side rotational restricting convex portion 13B below the base side rotational restricting convex portion 13B. Arranged adjacent to the portion 13B.

  Each base-side rotation restricting convex portion 13B and each adjacent convex portion 13C have an operation member guide surface 13D on the inner side in the radial direction of the circle with the rotation center C as the center. The operation member guide surface 13D is a surface that slides on the outer peripheral surface of the operation member 40 to guide the rotation of the operation member 40, and is a curved surface that is curved in a substantially arcuate shape with the rotation center C as the center when viewed from the left-right direction. It is formed in a shape. As described above, the operation member guide surface 13D is formed as a part of the cam guide portion 13, so that the rotation cam guide surface has a more compact configuration than the configuration in which the rotation cam guide surface is provided in a portion different from the cam guide portion. The operation member 40 can be rotated favorably. Thus, the slide cam 30 driven by the operation member 40 can be operated favorably with a compact configuration.

  As shown in FIGS. 3 and 4, the shaft support portion 14 is a convex portion provided on the base portion 11 that functions as a rotation shaft that rotatably supports the lock gear 20, and is provided above each cam guide portion 13. One by one. As with the pair of cam guide portions 13, the pair of shaft support portions 14 are provided symmetrically with respect to the straight line L <b> 1 when viewed from the left-right direction. In the present embodiment, the base plate 10 is formed symmetrically with respect to the straight line L1 when viewed from the left-right direction.

  The support convex portion 15 is a portion that receives a load from the lock gear 20, specifically, a load in the rotational direction of the internal gear 60, and is disposed between the pair of shaft support portions 14 in the front-rear direction. More specifically, the support convex portion 15 includes an upper end portion of the first lock gear 20A (one end portion of the first lock gear 20A in the circumferential direction of the internal gear 60) and an upper end portion (internal gear) of the second lock gear 20B in the front-rear direction. 60 in the circumferential direction of the second lock gear 20B). Furthermore, the support convex portion 15 is opposite to the pair of cam guide portions 13 with respect to the straight line L2 connecting the ends on the upper side (support convex portion 15 side) of the pair of cam guide portions 13, that is, the straight line L2. It is arranged on the upper side.

  The support convex part 15 is formed in a shape in which the width of the central part in the vertical direction (the radial direction of the circle centered on the rotation center C) is smaller than the widths of the upper and lower ends. In other words, the support convex part 15 is formed in a shape in which the central part in the vertical direction is recessed inward in the front-rear direction than the upper and lower end parts. More specifically, the support convex portion 15 includes a first gear support surface 15A disposed on the front side (one side) of the support convex portion 15 and a rear side of the support convex portion 15 (in the rotational direction of the internal gear 60). And a second gear support surface 15B disposed on the other side. The first gear support surface 15A is formed in an arc shape centered on the front shaft support portion 14 (rotation center of the first lock gear 20A) when viewed from the left-right direction, and the second gear support surface 15B is formed in the left-right direction. As viewed from the rear side, it is formed in an arc shape centered on the shaft support portion 14 on the rear side (the rotation center of the second lock gear 20B).

  The first gear support surface 15A is in contact with the contact surface 25B, which is a part of the side surface of the wheel as viewed from the left-right direction of the first lock gear 20A, and the rotation direction of the internal gear 60 from the first lock gear 20A. It is the surface that receives the load of. Further, the second gear support surface 15B comes into contact with a contact surface 25B, which is a part of a side surface of the second lock gear 20B as viewed from the left-right direction, and the internal gear 60 rotates from the second lock gear 20B. It is the surface that receives the load in the moving direction.

  The load receiving portion 16 is a portion that receives a load in the rotational direction of the internal gear 60 from the lock gear 20, similarly to the support convex portion 15. The load receiving portion 16 includes a first load receiving portion 16A disposed on the upper side in the front-rear direction outside the pair of cam guide portions 13 and a second load disposed on the lower side in the front-rear direction outer side of the pair of cam guide portions 13. And a load receiving portion 16B. Each of the load receiving portions 16A and 16B has a pair of surfaces facing the rotation direction of the internal gear 60 and a pair of surfaces facing the radial direction of the circle centered on the rotation center C when viewed from the left-right direction. It is formed in a substantially square shape. The surfaces of the load receiving portions 16A and 16B that receive the load are formed in a substantially arc shape along the circumference of a circle centered on the shaft support portion 14 (the rotation center of the lock gear 20) when viewed from the left-right direction. Yes.

  The engaged portion 17 is a groove-like concave portion that is provided in the lower portion of the base portion 11 and extends in the up-down direction. Similar to the pair of cam guide portions 13, the engaged portion 17 is provided symmetrically with respect to the straight line L1. ing. The engaged portion 17 has an upper end in a region between the straight line L2 and a straight line L3 connecting the lower ends of the pair of cam guide portions 13 (region sandwiched between the pair of cam guide portions 13). Arranged inside, the part below the upper end is arranged outside the area sandwiched between the pair of cam guide portions 13 (below the straight line L3). That is, the engaged portion 17 is disposed from the region sandwiched between the pair of cam guide portions 13 to the outside of the region. According to such a configuration, a part of the concave engaged portion 17 is arranged in a region sandwiched between the pair of convex cam guide portions 13 having high rigidity. Even if the engaging portion 17 is formed long, a decrease in the rigidity of the base plate 10 can be suppressed.

  As shown in FIG. 6, the base plate 10 has a positioning projection 18 and a welding projection 19 that protrude from the base 11 to the right (opposite the lock gear 20 and slide cam 30 side).

  The positioning convex part 18 is a part for determining the position of the base plate 10 with respect to the cushion side frame F1 (see FIG. 1) of the seat cushion S1. More specifically, the position of the base plate 10 relative to the seat cushion S1 is determined by the positioning convex portion 18 engaging with a concave portion provided on a base plate fixing surface (not shown) of the cushion side frame F1.

  Two positioning projections 18 are provided on the base plate 10. Specifically, as shown in FIG. 3, the positioning convex portion 18 is provided one by one on the front side and the rear side of the support convex portion 15 as viewed from the left-right direction, and is disposed adjacent to the support convex portion 15. Yes. Further, when viewed from the support convex portion 15 side, the support convex portion 15 is disposed on a straight line L4 connecting the centers of the two positioning convex portions 18 adjacent to each other in the front-rear direction when viewed from the left-right direction.

  According to such a configuration, since the positioning convex portion 18 is disposed near the portion having the high rigidity provided with the support convex portion 15, it is possible to improve the positioning accuracy of the base plate 10 with respect to the seat cushion S1. Can do. Further, since the support convex portion 15 provided close to each other protrudes to the left side and the positioning convex portion 18 protrudes to the right side, an uneven shape is formed in the vicinity of the support convex portion 15 of the base 11, and the vicinity of the support convex portion 15. The rigidity of the base plate 10 can be increased. In particular, in the present embodiment, since the positioning protrusions 18 are adjacently disposed on both sides of the support protrusion 15, the rigidity of the base plate 10 is further improved compared to a configuration in which only one positioning protrusion is provided. Can be increased.

  Returning to FIG. 6, the welding convex portion 19 is a portion for fixing the base plate 10 to the cushion side frame F <b> 1 (see FIG. 1) of the seat cushion S <b> 1 by welding. More specifically, the base plate 10 is welded to the weld projection 19 and the cushion side frame F1 in a state where the weld projection 19 is engaged with a recess provided on the base plate fixing surface of the cushion side frame F1. The seat cushion S1 is fixed. A plurality of welding projections 19 are provided, and have a pair of first welding projections 19 </ b> A arranged opposite to each other in the front-rear direction, and one second welding projection 19 </ b> B arranged at the lower end of the base 11. ing.

  The base plate 10 is formed by pressing a metal plate. Thereby, as shown in FIG. 4, the 2nd welding convex part 19B forms the welding recessed part 19D which makes concave shape in the back (surface by the side of the slide cam 30 of the base 11). The lower end portion of the engaged portion 17 is connected to the central portion in the front-rear direction of the weld recess 19D. More specifically, the engaged portion 17 and the weld recess 19D have substantially the same depth and are formed as one continuous recess having a substantially T shape when viewed from the left-right direction.

  Further, since the base plate 10 is formed by pressing a metal plate, the base plate 10 has a concave shape behind the base side rotation restricting convex portion 13B as shown in FIGS. A first recess 13E is formed, and a concave second recess 13F is formed on the back of the adjacent protrusion 13C. According to such a configuration, one large recess 13 </ b> E and a second recess 13 </ b> F that extend so as to connect the front and rear walls of one recess that is vertically extended (a recess having a continuous recess 13 </ b> E, 13 </ b> F). Since the convex portion 13G is divided into small concave portions, a reduction in rigidity of the cam guide portion 13 can be suppressed as compared with a configuration in which one large concave portion is formed.

  As shown in FIGS. 2 and 7, the internal gear 60 is a member that, together with the base plate 10, forms a housing that houses the lock gear 20, the slide cam 30, the operation member 40, and the biasing member 50. The internal gear 60 includes a disc-shaped facing portion 61, an annular internal tooth forming portion 62 that extends to the right from the outer peripheral portion of the facing portion 61, and a gear that protrudes to the right (base plate 10 side) from the facing portion 61. It has the side rotation control convex part 63 and the four welding convex parts 64 which protrude from the facing part 61 to the left side.

  The facing portion 61 is a portion that faces the base portion 11 of the base plate 10 in the left-right direction, and holds the lock gear 20, the slide cam 30, the operation member 40, and the like with the base portion 11.

  The internal tooth forming portion 62 has internal teeth 62 </ b> A on the inner peripheral portion, and is formed to engage with the inner side of the outer peripheral wall portion 12 of the base plate 10.

  The welding convex part 64 is a part for fixing the internal gear 60 to the back side frame F2 (see FIG. 1) of the seat back S2 by welding. More specifically, the internal gear 60 includes the welding convex portion 64 and the back side frame F2 in a state where the welding convex portion 64 is engaged with a concave portion provided on an internal gear fixing surface (not shown) of the back side frame F2. Is fixed to the seat back S2.

  As shown in FIG. 3, the lock gear 20 is a member that switches between a state in which the rotation of the internal gear 60 relative to the base plate 10 is restricted and a state in which the rotation is allowed. More specifically, the lock gear 20 is disengaged from the lock posture (the posture of FIG. 10) that restricts the rotation of the internal gear 60 by meshing with the internal teeth 62 </ b> A of the internal gear 60 and the internal teeth 62 </ b> A of the internal gear 60. Thus, the base plate 10 can be displaced (displaceable) so that it can be displaced between the release posture (in FIG. 11) allowing the internal gear 60 to rotate and, specifically, can be turned. It is supported by.

  Two lock gears 20 are provided and include a first lock gear 20A and a second lock gear 20B. In the first lock gear 20A and the second lock gear 20B, the first lock gear 20A is disposed on the front side of the pair of cam guide portions 13 with the pair of cam guide portions 13 interposed therebetween, and the second lock gear 20B is disposed between the pair of cam guide portions 13. Located on the back side. The first lock gear 20A and the second lock gear 20B are formed symmetrically with respect to the straight line L1.

  Each lock gear 20 is formed in an elongated shape that is curved and extends along the circumferential direction (rotation direction) of the internal gear 60, and the internal gear 60 is formed on the outer peripheral surface from the central portion to the lower end in the circumferential direction. A plurality of gear teeth 21 that can mesh with the inner teeth 62A are provided.

  As shown in FIG. 8, each lock gear 20 has a long hole portion 22 and a load transmission portion 23 on the surface on the base 11 side.

  The long hole portion 22 is a recess that extends long in the circumferential direction of the internal gear 60, and is disposed at the upper end portion (one end portion in the circumferential direction) of the lock gear 20. The long hole portion 22 includes a shaft support portion 22A and an extending recess portion 22B extending from the shaft support portion 22A toward the lower end portion of the lock gear 20 along the circumferential direction of the internal gear 60.

  The supported shaft portion 22A is a recess that engages with the shaft support portion 14 of the base plate 10, and is formed in an arc shape having a central angle larger than 180 ° when viewed from the left-right direction. Further, the width of the pivoted support portion 22A (the length in the radial direction of the circle with the rotation center C as the center) is larger than the width of the extending recess 22B.

  The load transmitting portion 23 is a portion that receives a load in the rotational direction of the internal gear 60 from the load receiving portion 16, more precisely, a portion that receives a reaction force of the load applied to the load receiving portion 16. It is formed as a concave portion that engages with the convex load receiving portion 16. Two load transmission portions 23 are provided for each lock gear 20, and a first load transmission portion 23A that engages with the first load receiving portion 16A and a second load transmission portion 23B that engages with the second load reception portion 16B. Including.

  The first load transmitting portion 23A is disposed at a position corresponding to the first load receiving portion 16A. Specifically, the first load transmitting portion 23A is obliquely below the elongated hole portion 22 and above the center of the lock gear 20 in the circumferential direction of the internal gear 60, and the elongated hole portion 22 (extension recess 22B). It is arranged adjacent to. Further, the second load transmitting portion 23B is disposed at a position corresponding to the second load receiving portion 16B. Specifically, the second load transmission portion 23B is on the opposite side of the elongated hole portion 22 (supported portion 22A) across the first load transmission portion 23A in the circumferential direction of the internal gear 60, and in the circumferential direction. It is arranged below the center of the lock gear 20.

  Each of the load transmitting portions 23A and 23B includes a pair of surfaces opposed in the rotation direction of the internal gear 60 and a pair of surfaces opposed in the radial direction of the circle centered on the rotation center C when viewed from the left-right direction. It is formed in the substantially square shape which has. In order to allow the lock gear 20 to rotate with respect to the base plate 10, each load transmitting portion 23A, 23B is formed in a quadrangular shape in which the first load transmitting portion 23A is larger than the first load receiving portion 16A, and the second load transmitting portion 23B. Is formed in a rectangular shape larger than the second load receiving portion 16B.

  The long hole portion 22 (the shaft support portion 22A) and the load transmission portion 23 are disposed inside the corresponding ring of the lock gear 20 when viewed from the left-right direction. Thereby, the long hole part 22 and the load transmission part 23 are formed as the recessed part of the collar which was closed seeing from the left-right direction. Further, the shaft support portion 14 and the load receiving portion 16 provided on the base plate 10 correspond to the shaft supported portion 22A and the load transmitting portion 23, as in the case of the shaft supported portion 22A and the load transmitting portion 23, as viewed from the left and right directions. It is arranged inside the ring of the lock gear 20.

  Each lock gear 20 has a lock-side pressed portion 24 at the lower end, and is pressed at the upper end (the tip portion on one end side in the circumferential direction of the internal gear 60 rather than the portion where the pivoted support portion 22A of the lock gear 20 is disposed). It has the cancellation | release side pressed part 25 as a part.

  The lock-side pressed portion 24 is a portion that is pressed by the slide cam 30 when the lock gear 20 is rotated from the release posture to the lock posture. The lock-side pressed portion 24 of each lock gear 20 has a first abutting surface 24A extending substantially in the vertical direction on the inner side in the front-rear direction, and obliquely upward on the outer side in the front-rear direction from the upper end of the first abutting surface 24A. From the first inclined surface 24B extending toward the upper surface, the second contacted surface 24C as a contacted surface extending substantially vertically from the upper end of the first inclined surface 24B, and the upper end of the second contacted surface 24C It has 2nd inclined surface 24D extended toward diagonally upward of the front-back direction outer side.

  When the lock gear 20 is in the locked position shown in FIG. 8, the slide cam 30 is in contact with the first contact surface 24A and the second contact surface 24C, and the gear teeth 21 are the internal teeth 62A of the internal gear 60. Are engaged.

  In the present embodiment, the load transmitting portion 23, in particular the second load transmitting portion 23B, is a position where the distance to the second contacted surface 24C is larger than the distance to the outer peripheral surface (gear tooth 21) of the lock gear 20, in other words. For example, it is arranged at a position close to the gear tooth 21 side. According to such a configuration, the load transmitting portion 23 is disposed at a position far from the second abutted surface 24C that receives the force from the slide cam 30, so that the deformation of the concave load transmitting portion 23 is suppressed. be able to. Thereby, since the load can be received by the load transmitting portion 23 while the lock gear 20 is rotated well, the load applied to the shaft support portion 14 and the shaft support portion 22A can be reduced.

  The release-side pressed portion 25 is a portion that is pressed by the slide cam 30 when the lock gear 20 is rotated from the lock posture to the release posture. The release-side pressed portion 25 is formed to have a width larger than the width of the portion where the pivot support portion 22A is disposed. Specifically, a portion of the upper end portion of the first lock gear 20A on the tip end side with respect to the portion where the pivoted support portion 22A is disposed is formed to extend between the support convex portion 15 and the front cam guide portion 13. A portion of the upper end portion of the second lock gear 20B on the front end side relative to the portion where the pivoted support portion 22A is disposed is formed to extend between the support convex portion 15 and the rear cam guide portion 13. ing. According to such a configuration, since the upper end portion of the lock gear 20 is disposed between the support convex portion 15 and the cam guide portion 13, the lock gear 20 is stably supported by the base plate 10. can do.

  The release-side pressed portion 25 of each lock gear 20 has a pressed surface 25A that is pressed by the slide cam 30 and a contact surface 25B that contacts the gear support surfaces 15A and 15B of the lock gear 20.

  A contact surface 25B (first contact surface) that contacts the first gear support surface 15A of the first lock gear 20A is centered on the front shaft support portion 14 when viewed from the left-right direction so as to coincide with the first gear support surface 15A. It is formed in a circular arc shape. Further, the contact surface 25B (second contact surface) that contacts the second gear support surface 15B of the second lock gear 20B matches the second gear support surface 15B so that the rear shaft support portion 14 is viewed from the left-right direction. It is formed in a circular arc shape centered at. According to such a configuration, the gear support surfaces 15A and 15B and the contact surface 25B are formed in a circular arc shape that matches each other, and the gear support surfaces 15A and 15B are disposed on both sides of the support convex portion 15, respectively. Since the load is applied, the lock gear 20 can be stably supported.

  As shown in FIG. 2, each lock gear 20 has a lifting restraining convex portion 26 protruding to the left side on the left side surface of the lock-side pressed portion 24 (the other end portion in the circumferential direction of the internal gear 60). Yes. The lifting restraining convex portion 26 comes into contact with the facing portion 61 of the internal gear 60. According to such a configuration, when the lifting restraining convex portion 26 abuts against the facing portion 61, the lock gear 20 lifts from the base portion 11 of the base plate 10, and is pressed against the internal teeth 62A of the internal gear 60 particularly in the locked state. The lifting of the lower end portion of the lock gear 20 to be generated can be suppressed.

  The lock gear 20 is formed by pressing a metal plate. As a result, the pivoted support portion 22A (the long hole portion 22) is formed so that the right side (one side in the left-right direction) of the lock gear 20 is concave and the left side (the other side in the left-right direction) of the lock gear 20 is convex. Has been. In the present embodiment, the pivoted support portion 22A that forms an uneven shape on the lock gear 20 and the release-side pressed portion 25 that is wider than the width of the portion where the pivoted support portion 22A is disposed are disposed close to each other. Therefore, the shaft support portion 22A and the release-side pressed portion 25 reinforce each other, and the rigidity of the lock gear 20 can be improved.

  Further, since the lock gear 20 is formed by pressing a metal plate, a convex portion is formed on the back side of the load transmitting portion 23 in the lock gear 20. The convex portion on the back of the load transmitting portion 23 is formed at substantially the same height as the lifting suppression convex portion 26, and comes into contact with the facing portion 61 of the internal gear 60 so that the locking gear 20 and the lifting suppression convex portion 26 are in contact with each other. Suppresses lifting.

  The slide cam 30 is a member that brings each lock gear 20 into a locked posture or a released posture by pressing each lock gear 20, and is supported by the base plate 10 so as to be displaceable. More specifically, the slide cam 30 is disposed between the pair of cam guide portions 13 and is supported so as to be slidable in the vertical direction with respect to the base plate 10. The lock cam 20 presses each lock gear 20 toward the lock posture. It is configured to be movable between a position (position in FIG. 10) and a release position (position in FIG. 11) that presses each lock gear 20 toward the release posture.

  As shown in FIGS. 3 and 4, the slide cam 30 includes a plate-like cam main body 31, an engagement portion 33 protruding from the cam main body 31 to the right side (base plate 10 side), and a left side from the cam main body 31. It has a drive projection 34 that projects to the side opposite to the base plate 10, a through hole 35 that penetrates in the left-right direction, and a projection edge 36.

  The cam main body 31 is formed long in the vertical direction. More specifically, the cam main body 31 has a lower portion (extension portion 32) that extends downward from the rotation center C (one of the moving directions of the slide cam 30) when viewed from the left-right direction. The length in the vertical direction is longer than the length in the vertical direction of the upper portion that extends upward from the rotation center C. The cam body 31 includes a pair of release-side pressing portions 31A formed on the upper surface, a guided portion 31B guided by the sliding cam guide surfaces 13A of the pair of cam guide portions 13, and a guided portion 31B. It has the front-end | tip part 31C extended toward the downward direction. The extending portion 32 is provided on the tip end portion 31C side, that is, on the first pressing surface 32A and the second pressing surface 32C side which will be described later.

  The release-side pressing portion 31A is a portion that rotates each lock gear 20 to the release posture by pressing the pressed surface 25A of the corresponding lock gear 20, and is formed as a surface substantially parallel to the front-rear direction.

  The guided portion 31 </ b> B is a portion of the cam body portion 31 that has a substantially constant width in the front-rear direction, and is a pair that contacts the second contacted surface 24 </ b> C of the lock gear 20 on the outer side in the front-rear direction of the lower end portion. The second contact surface 32D.

  The distal end portion 31C is formed in a shape in which the width in the front-rear direction is narrower than that of the guided portion 31B, specifically, a tapered shape in which the width in the front-rear direction decreases as it goes downward, and is sandwiched between the pair of cam guide portions 13. It is arranged on the outside (below the straight line L3) of the area. The distal end portion 31C has a pair of first pressing surfaces 32A extending obliquely upward from the distal end of the distal end portion 31C and a pair of first contacts extending upward from the upper end of the first pressing surface 32A outward in the front-rear direction. The contact surface 32B includes a pair of second pressing surfaces 32C that extend obliquely upward from the upper end of the first contact surface 32B and are connected to the second contact surface 32D. Each first contact surface 32B is formed in a shape in which the lower end portion extends substantially in the vertical direction, the vertical center portion is inclined obliquely upward and outward in the front-rear direction, and the upper end portion extends substantially in the vertical direction. ing.

  The engaging portion 33 is a convex portion that engages with the engaged portion 17 of the base plate 10, is formed long in the vertical direction, and is disposed from the lower end portion of the guided portion 31B to the distal end portion 31C. Here, since the engaging portion 33 is formed as a convex portion that engages with the concave engaged portion 17, the slide cam 30 has a highly rigid portion having an uneven shape near the engaging portion 33. It becomes. And since this highly rigid part (engagement part 33) is arrange | positioned from the lower end part of the to-be-guided part 31B to the front-end | tip part 31C, in this embodiment, the width | variety becomes narrower than the to-be-guided part 31B. Since the rigidity of the distal end portion 31C can be suppressed, the rigidity of the entire slide cam 30 can be improved.

  The vertical length of the engaging portion 33 is shorter than the vertical length of the engaged portion 17. Therefore, the engaging portion 33 engaged with the engaged portion 17 can move in the vertical direction along the engaged portion 17. In other words, the engaging portion 33 and the engaged portion 17 are configured to guide the sliding movement of the slide cam 30 in the vertical direction. Thereby, the slide cam 30 is guided to slide by both the pair of cam guide portions 13 and the engaged portion 17.

  The drive convex portion 34 is a portion that engages with the operation member 40 to transmit the operation of the operation member 40 to the slide cam 30, and is formed in a substantially cylindrical shape. The driving convex portion 34 is disposed on the lower side (the extending portion 32 side) with respect to a straight line L5 that passes through the rotation center C and extends in the front-rear direction when viewed from the left-right direction. In addition, the driving convex portion 34 is disposed not in the tip portion 31C but in the guided portion 31B (wide portion) in the portion below the straight line L5 of the cam main body portion 31. Since the driving convex portion 34 receives a force from the operation member 40, the driving convex portion 34 is arranged on the guided portion 31 </ b> B having a higher rigidity than the tip portion 31 </ b> C having a narrow width, so that the rigidity in the vicinity of the driving convex portion 34 of the slide cam 30 is increased. Can be increased. Thereby, the operation of the slide cam 30 can be stabilized.

  Further, the driving convex portion 34 is shifted to one side in the front-rear direction with respect to a straight line L1 extending in the up-down direction through the rotation center C (the center of the slide cam 30 in the front-rear direction), as viewed from the left-right direction, specifically Is arranged on the front side of the straight line L1. In other words, the driving convex portion 34 is disposed on the front side of the straight line L1 so as to avoid a concave portion formed on the back of the engaging portion 33.

  Further, the driving convex portion 34 is adjacent to an engaging portion 33 as a reinforcing portion that increases the rigidity of the slide cam 30 when viewed from the left and right directions, and on the circumference of the same circle with the rotation center C as the center. Has been placed. According to such a configuration, the driving convex portion 34 that receives the force from the operation member 40 can be disposed near the portion having the high rigidity provided with the engaging portion 33, so that the driving convex portion 34 in the vicinity of the driving convex portion 34 of the slide cam 30 can be disposed. The rigidity can be further increased, and the operation of the slide cam 30 can be further stabilized.

  The through hole 35 is a hole for inserting the rotation shaft 91 (see FIG. 5) of the operation lever. The through hole 35 is formed in an elliptical shape that is long in the vertical direction and is disposed on the upper side of the engaging portion 33 in order to allow the slide cam 30 to slide in the vertical direction.

  As shown in FIG. 9, the protruding edge portion 36 is an annular convex portion that is an edge portion of the through hole 35 and slightly protrudes to the left side. The operation member 40 is disposed so as to slide on the protruding edge 36 when rotating. Thereby, since the contact area of the slide cam 30 and the operation member 40 can be made small, the sliding resistance of the slide cam 30 and the operation member 40 can be made small. As a result, since the operation member 40 can be operated favorably, the operation load for sliding the slide cam 30 can be reduced.

  As shown in FIG. 2, the operation member 40 is rotatably supported with respect to the base plate 10 and is a member that moves the slide cam 30 to the lock position or the release position by rotating. It is arranged on the left side to face the slide cam 30. The operation member 40 includes a supported portion 41 and a rotation restricting portion 42 constituting a plate-shaped main body portion, an engagement hole 43, a drive groove portion 44, and a pair of retaining holes 45. As shown, it is symmetrical about the straight line L1.

  The supported portion 41 is a portion having a substantially oval shape when viewed from the left-right direction (the rotation axis direction of the operation member 40), and the base-side rotation restricting convex portion 13 </ b> B and the adjacent convex portion 13 </ b> C on the front and rear of the base plate 10. Arranged between. When the slide cam 30 is in the locked position, the supported portion 41 is formed in an arc shape whose front and rear surfaces are centered on the rotation center C when viewed from the left-right direction. The operation member 40 is rotatable with respect to the base plate 10 by guiding the outer peripheral surface of the supported portion 41 along the operation member guide surface 13D.

  The rotation restricting portion 42 is a portion having a substantially rectangular shape when viewed from the left and right directions extending downward from the supported portion 41 when the slide cam 30 is in the locked position. The operation member 40 is configured such that the amount of rotation of the operation member 40 is restricted when both end portions of the rotation restricting portion 42 in the rotation direction of the operation member 40 come into contact with the adjacent convex portion 13 </ b> C of the base plate 10.

  The engagement hole 43 is a hole with which the rotation shaft 91 of the operation lever for operating the reclining mechanism 1 is engaged, and is arranged at the center of the supported portion 41 when viewed from the left-right direction. The engagement hole 43 is formed to have a substantially cross shape, and an edge portion of the engagement hole 43 is formed as an annular projecting portion projecting leftward from the supported portion 41 (see also FIG. 2). The operation member 40 is configured to rotate integrally with an operation lever operated by an occupant when the rotation shaft 91 is engaged with the engagement hole 43.

  The drive groove portion 44 is a groove with which the drive convex portion 34 of the slide cam 30 is engaged, and is disposed in the rotation restricting portion 42. The drive groove portion 44 has a first groove portion 44A extending in the front-rear direction and a diameter of the rotation shaft 91 (the rotation shaft of the operation member 40) from both ends of the first groove portion 44A in the locked posture in which the slide cam 30 is at the lock position. It has a pair of 2nd groove part 44B extended so that it may mutually spread toward the direction outer side. Although the operation of the reclining mechanism 1 will be described later, each of the second groove portions 44B is configured to guide the drive convex portion 34 and move the slide cam 30 to the lock position or the release position when the operation member 40 rotates. It is configured. In the present embodiment, the driving convex portion 34 that engages with the driving groove portion 44 is positioned at the lower end portion of the second groove portion 44B on the front side in the locked posture.

  The retaining hole 45 is a hole through which the end of the urging member 50 is inserted, and is disposed on the lower side of the engaging hole 43 in the front-rear direction.

  The biasing member 50 is a linear member that biases the slide cam 30 toward the lock position via the operation member 40, and includes a biasing member main body 51 and a first latching portion 52 formed at one end. And a second latching portion 53 formed at the other end.

  The first latching portion 52 is biased from one end of the biasing member main body 51 toward the radially outer side of the circle centered on the rotation center C, and biased from the end of the first portion 52A. And a second portion 52 </ b> B extending along the member main body 51. The first hooking portion 52 is hooked on a base side rotation restricting convex portion 13 </ b> B formed on the front cam guide portion 13. More specifically, in the first hooking portion 52, the first portion 52A is disposed between the base side rotation restricting convex portion 13B and the adjacent convex portion 13C, and the second portion 52B is disposed on the base side rotation restricting convex portion. By being hooked on 13B, the base side rotation restricting convex portion 13B is sandwiched between the second portion 52B and one end portion of the biasing member main body 51. More specifically, one end of the urging member 50 has one end of the urging member main body 51, and the second portion 52B and the first portion 52A are substantially U-shaped along the side surface of the base-side rotation restricting convex portion 13B. It is formed and latched so as to be wound around the base side rotation restricting convex portion 13B.

  As shown in FIG. 11, the first latching portion 52 is disposed at a position where it does not come into contact with the lock gear 20 even when the front lock gear 20 rotates to the release posture. Specifically, the first latching portion 52 is disposed inside the wheel cage of the front cam guide portion 13 when viewed from the left-right direction. Thereby, interference with the 1st latching | locking part 52 and the front side lock gear 20 rotated to the cancellation | release attitude | position can be suppressed.

  Returning to FIG. 10, the second hooking portion 53 is formed to extend from the other end of the urging member main body 51 toward the base 11. The urging member 50 is configured such that the first hooking portion 52 is hooked on the front base side rotation restricting convex portion 13B, and the biasing member main body portion 51 is on the front base side turning restricting convex portion 13B. The second latching portion 53 is disposed in the latching hole 45 on the front side of the operation member 40, and is arranged along the operation member guide surface 13 </ b> D of the base-side rotation restricting projection 13 </ b> B on the side and the adjacent projection 13 </ b> C on the rear side. It is arranged by being hooked.

  As shown in FIG. 2, the ring 70 is a member for rotatably holding the internal gear 60 on the base plate 10. The ring 70 is an inner side in the radial direction from the annular ring body 71 and the left end of the ring body 71. And a holding portion 72 extending to the center. As shown in FIG. 9, the ring 70 is fixed to the base plate 10 by welding the right end portion of the ring main body 71 and the base plate 10, and the holding portion 72 is an outer peripheral portion (internal tooth forming portion) of the internal gear 60. 62). Thereby, the internal gear 60 is rotatably held by the base plate 10, and the lock gear 20, the slide cam 30, the operation member 40 and the biasing member 50 are held between the base plate 10 and the internal gear 60. .

Next, the operation of the reclining mechanism 1 configured as described above will be described.
As shown in FIG. 10, when the occupant operates the operation lever in the release direction against the urging force of the urging member 50 in a state where each lock gear 20 is in the locked position (locked state), the operation member 40 is moved to the illustrated timepiece. Rotate around. Then, the drive convex portion 34 of the slide cam 30 is pressed by the lower surface of the front second groove portion 44B, so that it is pushed up along the lower surface of the front second groove portion 44B. The slide cam 30 slides from the lock position toward the upper release position.

  As shown in FIG. 11, when the release side pressing portion 31 </ b> A of the slide cam 30 contacts the pressed surface 25 </ b> A of each lock gear 20 and presses the pressed surface 25 </ b> A, the release side pressed portion 25 is pushed up, Each lock gear 20 rotates from the lock posture to the release posture around the shaft support portion 14. When the slide cam 30 reaches the release position, the lock gears 20 are in the release posture, and the gear teeth 21 are completely detached from the internal teeth 62A of the internal gear 60. As a result, the internal gear 60 is allowed to rotate with respect to the base plate 10, so that the seat back S2 is allowed to tilt with respect to the seat cushion S1. As shown in FIGS. 5A and 5B, the internal gear 60 rotates its rotation when the gear-side rotation restricting convex portion 63 abuts on the base-side rotation restricting convex portion 13B of the base plate 10. The amount of movement is regulated. Thereby, the amount of tilting of the seat back S2 is regulated.

  As shown in FIG. 11, when the slide cam 30 reaches the release position, the drive convex portion 34 is positioned at the upper end portion of the second groove portion 44B on the front side. From this state, when the operation member 40 is further rotated in the clockwise direction by the operation of the occupant, the first groove portion 44A is engaged with the drive convex portion 34, but the first groove portion 44A is in the front-rear direction. Because of the extending groove, the drive protrusion 34 is not pushed up any further. Thereby, it can suppress that an excessive load is applied to the slide cam 30 and each lock gear 20. Note that the rotation amount of the operation member 40 is restricted when the rotation restricting portion 42 contacts the adjacent convex portion 13 </ b> C of the base plate 10.

  In a state where each lock gear 20 is in the release posture (release state), when the occupant releases his / her hand from the operation lever, the operation member 40 is rotated counterclockwise by the urging force of the urging member 50. Then, the drive convex portion 34 of the slide cam 30 is pressed by the upper surface of the front second groove portion 44B, so that it is pushed down along the upper surface of the front second groove portion 44B. The cam 30 slides from the release position toward the lower lock position.

  When the pair of second pressing surfaces 32C of the slide cam 30 abut against the second inclined surfaces 24D of the lock gears 20 and press the second inclined surfaces 24D, the lock-side pressed portions 24 are pushed down, and the lock gears 20 are pressed. Rotates around the shaft support 14 from the release posture to the lock posture. Thereafter, as shown in FIG. 10, the second pressing surface 32 </ b> C is disengaged from the second inclined surface 24 </ b> D, and the pair of second contact surfaces 32 </ b> D of the slide cam 30 is between the second contacted surfaces 24 </ b> C of the lock gears 20. When entering, each lock gear 20 becomes a substantially locked posture, and the gear teeth 21 mesh with the internal teeth 62 </ b> A of the internal gear 60.

  Further, when the pair of first contact surfaces 32B of the slide cam 30 enters between the first contacted surfaces 24A of the lock gears 20 and the slide cam 30 slides toward the lock position, the first contact surfaces 32B. Is inclined toward the upper side of the outer side in the front-rear direction, so that the lock-side pressed portion 24 of each lock gear 20 is expanded and the lock cam 20 is locked when the slide cam 30 reaches the release position. Held in posture. As a result, the rotation of the internal gear 60 relative to the base plate 10 is restricted, and the tilting of the seat back S2 relative to the seat cushion S1 is restricted.

  If a force is applied to the seat back S2 when the reclining mechanism 1 is in a locked state, a load in the rotational direction is applied to the internal gear 60, and each lock gear 20 that meshes with the internal teeth 62A of the internal gear 60 is also applied. A load in the rotation direction acts on the internal gear 60. For example, when a load acts in the clockwise direction in the figure, in the front lock gear 20, the load transmitting portion 23 to the load receiving portion 16 and the contact surface 25B to the first gear support surface 15A of the support convex portion 15 are used. Each load will be applied. Further, in the rear side lock gear 20, the supported shaft portion 22A to the supported shaft portion 14, the load transmitting portion 23 to the load receiving portion 16, the second abutted surface 24C to the second abutting surface 32D, and The load is applied from the first contacted surface 24A to the first contact surface 32B. Further, in the slide cam 30 to which a load is applied from the rear lock gear 20, a load is applied from the engaging portion 33 to the engaged portion 17.

  In the present embodiment, since the load transmission portion 23 is provided in the lock gear 20 and the load receiving portion 16 is provided in the base plate 10, the load can be dispersed, and the shaft support portion 14, the shaft support portion 22 </ b> A, and the support convex portion. The load applied to 15 can be reduced. In particular, in the present embodiment, since the load transmitting portion 23 and the load receiving portion 16 are disposed inside the ring of the lock gear 20 as viewed from the left-right direction, the load transmitting portion and the like are provided so as to protrude from the ring. As compared with the above, the load applied to the shaft support portion 14, the shaft support portion 22 </ b> A, and the support convex portion 15 can be reduced with a compact configuration.

  In addition, since each lock gear 20 is provided with a plurality of load transmission portions 23, the load can be further dispersed, and the load applied to the shaft support portion 14, the shaft support portion 22A, and the support convex portion 15 can be further reduced. it can. Further, the second load transmission portion 23B is disposed on the opposite side of the pivoted portion 22A across the first load transmission portion 23A in the circumferential direction of the internal gear 60 (see also FIG. 3). Compared to the configuration in which the portion 23 is provided in the short-side direction of the long lock gear 20, it is possible to secure the size of the load receiving portion such as each load transmitting portion 23. The load applied to 22A and the support convex part 15 can be reduced further.

  According to the reclining mechanism 1 of the present embodiment described above, the slide cam 30 is sandwiched between the pair of cam guide portions 13 and the concave engaged portion in which the convex engaging portion 33 is formed on the base plate 10. 17, the position of the slide cam 30 can be accurately determined. Further, since the movement of the slide cam 30 is guided by both the pair of cam guide portions 13 and the engaged portion 17, the movement of the slide cam 30 can be stabilized.

  Particularly in this embodiment, the lower portion of the engaged portion 17 is disposed outside the region sandwiched between the pair of cam guide portions 13, so that the slide cam 30 is sandwiched between the cam guide portions 13. The movement of the portion outside the region can be guided by the engaged portion 17. Thereby, the movement of the slide cam 30 can be stabilized even outside the area sandwiched between the pair of cam guide portions 13.

  In the present embodiment, the engaged portion 17 is a concave portion and the engaging portion 33 is a convex portion, so that the position of the slide cam 30 can be accurately determined with a relatively simple configuration, and the slide The movement of the cam 30 can be stabilized.

  Further, in this embodiment, since the recessed engaged portion 17 is connected to the welding recess 19D, the slide cam 30 has a portion where the engaged portion 17 and the welding recess 19D are connected as a part of the engaged portion 17. It is possible to use it for guidance of movement. Thereby, the movement amount of the slide cam 30 is securable. Moreover, the rigidity of the base plate 10 can be improved because the engaged portion 17 and the weld recess 19D are connected.

  Further, since the shaft support portion 14 of the base plate 10 and the supported shaft support portion 22A of the lock gear 20 are disposed inside the ring of the lock gear 20 when viewed from the left-right direction, the shaft support portion is disposed around the lock gear (outside of the ring). Compared to a simple configuration, the reclining mechanism 1 can be prevented from being enlarged in the radial direction.

  Further, in the present embodiment, the shaft support portion 14 is a convex portion that protrudes toward the lock gear 20 and the shaft support portion 22A is a recess, so that the shaft support portion 14 is a base plate (not shown) of the cushion side frame F1 (see FIG. 1). The influence on the fixed surface can be suppressed. Supplementally, when the shaft support portion of the base plate is a concave portion, for example, when the base plate is formed by pressing a metal plate, a convex portion may be formed on the back of the concave shaft support portion. If it does so, it will be necessary to form the recessed part etc. for receiving the said convex part in the baseplate fixed surface of cushion side frame F1, and it may affect the shape of a baseplate fixed surface. On the other hand, in this embodiment, since the shaft support part 14 is a convex part, since the convex part is not formed in the back of the shaft support part 14, the influence on the base plate fixed surface of the cushion side frame F1 can be suppressed.

  Moreover, since the cam guide part 13 which guides the movement of the slide cam 30 is utilized as a part which latches one end (the 1st latching part 52) of the biasing member 50, the biasing member 50 is latched. Therefore, the configuration is not complicated. In addition, since one end of the urging member 50 is hooked on the cam guide portion 13 that protrudes from the base portion 11 of the base plate 10 and has high rigidity, the urging member 50 can be hooked stably.

  In particular, in the present embodiment, since the protruding cam guide portion 13 is further provided with a convex portion (base side rotation restricting convex portion 13B), the rigidity of the cam guide portion 13 can be further increased, and the rigidity is higher. Since one end of the urging member 50 is hooked to the base-side rotation restricting convex portion 13B that is a part of the cam guide portion 13 that has become, the urging member 50 can be hooked more stably.

  In the present embodiment, one end of the urging member 50 passes between the base side rotation restricting convex portion 13B and the adjacent convex portion 13C and is hooked to the base side rotation restricting convex portion 13B. It is possible to suppress the movement of the urging member 50 in the direction in which the convex portions are arranged, or to prevent one end of the urging member 50 from interfering with a member disposed in the vicinity thereof. Thereby, the biasing member 50 can be latched more stably.

  Further, in the present embodiment, one end of the urging member 50 is disposed between the two convex portions 13B and 13C and is hooked so as to be wound around the base side rotation regulating convex portion 13B. The biasing member 50 can be latched more stably. Further, by forming one end of the urging member 50 in a shape along the base-side rotation restricting convex portion 13B in advance, the assembly performance of the urging member 50 can be improved, or the urging member after assembly. 50 mounting rigidity can be improved.

  Further, as shown in FIG. 3, the drive convex portion 34 of the slide cam 30 is disposed on the lower portion (the extended portion 32 side) of the cam main body portion 31 that extends long from the rotation center C. The drive convex portion 34 can be disposed away from the rotation center C. Thereby, the operation load for moving the slide cam 30 can be reduced. Further, by arranging the drive convex portion 34 in the lower portion that is longer than the upper portion of the cam main body portion 31 with the rotation center C as a reference, for example, the upper portion of the cam main body portion is formed longer and the drive convex portion Compared to a configuration in which the portion is arranged, the overall size of the slide cam 30 can be suppressed. Thereby, the enlargement of the reclining mechanism 1 can be suppressed.

  Further, the first support convex portion 15 of the base plate 10 is provided with a first gear support surface 15A that receives a load from the first lock gear 20A and a second gear support surface 15B that receives a load from the second lock gear 20B. Therefore, the number of support protrusions can be reduced compared to a configuration in which one support protrusion is provided for each lock gear. Thereby, since the enlargement of the baseplate 10 can be suppressed, the enlargement of the reclining mechanism 1 can be suppressed.

  Further, in the present embodiment, the support convex portion 15 is formed in a shape in which the width of the central portion in the vertical direction is smaller than the width of both end portions, so that the gear support surfaces 15A and 15B are provided on both sides of the support convex portion 15. The gear support surfaces 15A and 15B can be formed as continuous surfaces in which the central portion is recessed from both end portions. Thereby, the lock gear 20 can be stably supported by the gear support surfaces 15A and 15B.

  Although one embodiment of the present invention has been described above, the present invention is not limited to the above-described embodiment. About a concrete structure, it can change suitably in the range which does not deviate from the meaning of invention.

  For example, as shown in FIG. 12, the base plate 10 may have an inclined surface 11 </ b> C formed at a corner formed by the base portion 11 and the cam guide portion 13. More specifically, the inclined surface 11 </ b> C is formed as a surface that is inclined so as to approach the cam guide portion 13 that faces the cam guide portion 13 that forms a corner with the base portion 11 as the base portion 11 is approached. In other words, the inclined surface 11C is formed as a surface that is inclined so as to be closer to the inner side in the front-rear direction as it approaches the base 11 side. Further, the corner portion 37 facing the inclined surface 11C of the slide cam 30 is preferably chamfered, and more preferably chamfered in an R shape. According to such a configuration, the slide cam 30 can be brought close to the cam guide portion 13 or the operation member 40 on the opposite side of the inclined surface 11C by the inclined surface 11C, so that rattling of the slide cam 30 is suppressed. can do. The base plate has a configuration in which an inclined surface is formed only at the corner between the base and the one cam guide, and no inclined surface is formed at the corner between the base and the other cam guide. Also good.

  In the above-described embodiment, the pivotally supported portion 22A is a concave portion formed in an arc shape when viewed from the left-right direction, but is not limited thereto. For example, as shown in FIG. 13, the pivoted support portion 122 may be a concave portion formed in a circular shape when viewed from the left-right direction (the rotation axis direction of the internal gear 60). According to such a configuration, the concave supported shaft portion 122 is circular, so that the entire circumference of the inner peripheral surface of the supported shaft portion 122 and the entire periphery of the side surface of the convex supported shaft portion 14 can slide. Therefore, the support area of the shaft support portion 14 and the supported shaft support portion 122 can be further ensured. Thereby, rotation of the lock gear 20 can be stabilized.

  In the embodiment, the engaging portion 33 is disposed from the guided portion 31B to the distal end portion 31C. However, the embodiment is not limited to this. For example, the engaging portion is provided on either the guided portion or the distal end portion. It may be arranged.

  In the above-described embodiment, the engaged portion 17 has an upper end disposed inside a region sandwiched between the pair of cam guide portions 13, and a portion below the upper end is sandwiched between the pair of cam guide portions 13. Although arranged outside the region, the present invention is not limited to this. For example, the entire engaged portion may be disposed outside the region sandwiched between the cam guide portions, or the entire engaged portion may be disposed inside the region sandwiched between the cam guide portions.

  In the above embodiment, the engaged portion 17 of the base plate 10 is a concave portion and the engaging portion 33 of the slide cam 30 is a convex portion. However, the present invention is not limited to this. For example, the engaged portion is a convex portion. Yes, the engaging portion may be a recess.

  In the above-described embodiment, the shaft support portion 14 of the base plate 10 is a convex portion, and the shaft support portion 22A of the lock gear 20 is a recess. However, the present invention is not limited to this, and for example, the shaft support portion is a recess and the shaft support portion is A convex part may be sufficient.

  In the above-described embodiment, one end (first latching portion 52) of the urging member 50 is latched by the base-side rotation restricting convex portion 13B. However, the present invention is not limited to this. For example, one end of the urging member may be hooked to the adjacent convex portion, or hooked to the cam guide portion (the main body portion of the cam guide portion excluding the base side rotation restricting convex portion or the adjacent convex portion). It may be.

  The configuration of the urging member 50 shown in the embodiment is an example, and is not limited to the configuration described above. For example, the urging member may be a spiral spring, a coil spring, a leaf spring, or the like.

  In the above-described embodiment, one cam guide portion 13 is provided on each of the front side and the rear side of the slide cam 30. However, the present invention is not limited to this. For example, the cam guide portion is provided on each of the front side and the rear side of the slide cam. A plurality of them may be provided.

  In the above-described embodiment, the engaging portion 33 protruding toward the base plate 10 is illustrated as the reinforcing portion provided on the slide cam 30. However, the present invention is not limited to this. For example, the reinforcing portion is provided separately from the engaging portion. It may be a protruding portion. In this case, the reinforcing part may be provided so as to protrude to the side opposite to the base plate side.

  In the above-described embodiment, the driving convex portion 34 is disposed at the guided portion 31B (wide portion) instead of the distal end portion 31C in the portion below the straight line L5 of the cam body portion 31. For example, the driving convex portion may be disposed at the tip portion.

  In the above-described embodiment, the reclining mechanism 1 is provided on the right side of the seat cushion S1, but the invention is not limited to this. For example, the reclining mechanism may be provided on the left side of the seat cushion, or provided on both the left and right sides. It may be done.

  When the reclining mechanism 1 of the embodiment is provided on the left side of the seat cushion S1, at least the slide cam and the urging member are configured symmetrically with the slide cam 30 and the urging member 50 of the embodiment. . On the other hand, as shown in FIG. 3, the base plate 10 has a pair of cam guide portions 13 and engaged portions 17 provided symmetrically with respect to the straight line L1 when viewed from the left-right direction. It can be configured as a part. Further, since the first lock gear 20A and the second lock gear 20B are formed symmetrically with respect to the straight line L1, it is possible to configure them as left and right common parts.

  Further, the drive convex portion 34 of the slide cam 30 is disposed at a position shifted to one side in the front-rear direction with respect to the straight line L1 when viewed from the left-right direction. 44A and a pair of second groove portions 44B extending from both ends of the first groove portion 44A, and each second groove portion 44B guides the driving convex portion 34 by the rotation of the operation member 40 to lock the slide cam 30. Or since it is comprised so that it may move to a cancellation | release position, the operation member 40 can be comprised as a right-and-left common component. Supplementally, in the operation member 40 in the state shown in FIG. 10, the second groove portion 44B on the front side guides the drive convex portion 34 of the slide cam 30 when the reclining mechanism 1 is provided on the right side of the seat cushion S1. The second groove 44B on the rear side is used to guide the drive convex portion of the slide cam that is symmetrical to the slide cam 30 when the reclining mechanism 1 is provided on the left side of the seat cushion S1. It is done.

  Thus, the base plate 10, the lock gear 20, and the operation member 40 can be configured as left and right common parts, so that the number of parts of the reclining mechanism 1 (vehicle seat S) can be reduced. Thereby, for example, the cost can be suppressed, and misassembly of the base plate 10 and the operation member 40 can be suppressed by using the left and right common parts.

  The configuration of the operation member 40 (operation member) shown in the above embodiment is an example, and is not limited to the above configuration. For example, in the above-described embodiment, the drive groove portion 44 has a configuration including the first groove portion 44A and the pair of second groove portions 44B provided at both ends of the first groove portion 44A, but is not limited thereto. The 2nd groove part may be the structure provided only in the one end part of the 1st groove part.

  In the above-described embodiment, the slide cam 30 supported by the base plate 10 so as to be slidable is exemplified as the cam. However, the present invention is not limited to this. May be.

  In the above embodiment, the reclining mechanism 1 has a configuration in which the base plate 10 is fixed to the seat cushion S1 and the internal gear 60 is fixed to the seat back S2, but the invention is not limited to this. For example, the reclining mechanism may be configured such that the base plate is fixed to the seat back and the internal gear is fixed to the seat cushion. In this configuration, when the base plate has a positioning projection, the positioning projection serves as a portion for determining the position of the base plate with respect to the seat back. In addition, when the base plate has a welding projection, the welding projection becomes a portion for fixing the base plate to the seat back by welding.

  In the embodiment, the reclining mechanism 1 is provided in the vehicle seat S, but the invention is not limited thereto. For example, the reclining mechanism is provided in a seat other than the vehicle seat such as an office chair. It may be.

DESCRIPTION OF SYMBOLS 1 Reclining mechanism 10 Base plate 11 Base 11B Through-hole 13 Cam guide part 15 Support convex part 15A 1st gear support surface 15B 2nd gear support surface 18 Positioning convex part 20 Lock gear 20A 1st lock gear 20B 2nd lock gear 25 Release side pressed part 25B Contact surface 30 Slide cam 60 Internal gear S1 Seat cushion S2 Seat back

Claims (7)

A reclining mechanism for adjusting the inclination angle of the seat back with respect to the seat cushion,
A base plate fixed to one of the seat cushion and the seat back;
An internal gear fixed to the other of the seat cushion and the seat back and rotatable with respect to the base plate;
A plurality of lock gears rotatably supported by the base plate so as to be rotatable between a lock posture meshing with the internal gear and a release posture disengaged from the internal gear;
A cam that is supported by the base plate so as to be displaceable and that presses the lock gears to bring the lock gears into the lock posture or the release posture;
The base plate has a base portion that faces the lock gears in a rotation axis direction of the internal gear, and a support convex portion that protrudes from the base portion to the lock gear side,
The plurality of lock gears include a first lock gear and a second lock gear;
The support convex portion is in contact with a side surface of the first lock gear as viewed from the rotation axis direction and configured to contact a side surface of the wheel so as to receive a load in the rotation direction of the internal gear, and the second gear support surface. A reclining mechanism comprising: a second gear support surface that receives a load in a rotation direction of the internal gear in contact with a side surface of the lock gear as viewed from the rotation axis direction. The first gear support surface and the first contact surface that contacts the first gear support surface of the first lock gear are circles centered on the rotation center of the first lock gear when viewed from the rotation axis direction. Formed in an arc,
The second gear support surface and the second contact surface that contacts the second gear support surface of the second lock gear are circles centered on the rotation center of the second lock gear when viewed from the rotation axis direction. Formed in an arc,
The first gear support surface is disposed on one side of the support convex portion in the rotation direction of the internal gear,
2. The reclining mechanism according to claim 1, wherein the second gear support surface is disposed on the other side of the support convex portion in a rotation direction of the internal gear. The base plate has a positioning projection that protrudes from the base to the side opposite to the lock gear for determining the position of the base plate relative to one of the seat cushion and the seat back,
The reclining mechanism according to claim 1, wherein the positioning convex portion is disposed adjacent to the support convex portion when viewed from the rotation axis direction. A plurality of the positioning protrusions are provided,
The reclining mechanism according to claim 3, wherein the support convex portion is disposed on a straight line connecting adjacent positioning convex portions when viewed from the rotation axis direction. The cam is slidably supported on the base plate,
The base plate has a pair of cam guide portions that are arranged so as to sandwich the cam in an orthogonal direction that protrudes from the base portion and orthogonal to the moving direction of the cam, and guides the cam movement,
The first lock gear and the second lock gear are formed in a long shape extending along the circumferential direction of the internal gear, and are arranged with the pair of cam guide portions interposed therebetween,
The support convex portion is disposed between one end portion in the circumferential direction of the first lock gear and one end portion in the circumferential direction of the second lock gear in the orthogonal direction,
One end portion in the circumferential direction of the first lock gear extends between the support convex portion and one of the pair of cam guide portions, and one end portion in the circumferential direction of the second lock gear is the support convex portion. The reclining mechanism according to any one of claims 1 to 4, wherein the reclining mechanism extends between the first cam guide portion and the other of the pair of cam guide portions. The base has a through hole;
The reclining mechanism according to claim 5, wherein the pair of cam guide portions are arranged so as to sandwich the through hole. The first gear support surface is disposed on one side of the support convex portion in the rotation direction of the internal gear,
The second gear support surface is disposed on the other side of the support convex portion in the rotation direction of the internal gear,
The support convex part is formed in a shape in which a width of a central part in a radial direction of a circle centering on a rotation center of the internal gear is smaller than a width of both end parts. The reclining mechanism according to claim 6.

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