JP5424859B2 - Vehicle seat reclining device - Google Patents

Description

  The present invention relates to a seat reclining device for a vehicle, which is an improved structure of a unit type recliner and a bracket.

  A vehicle seat reclining device is provided so that the seat back can be locked at an arbitrary rotational position with respect to the seat cushion.

  As a conventional vehicle seat reclining device, for example, a device disclosed in Patent Document 1 is known. As shown in FIG. 6 of Patent Document 1, this seat reclining device is configured by providing a hinge 4 (recliner) of FIG. 3 between a seat side flange 5 and a backrest side flange 6. The hinge 4 is configured as a circular unit, and includes a cover 10 and a bottom portion 20 that can rotate with respect to the cover 10 and can restrain the rotation, as shown in FIG. The stud 15 formed on the cover 10 is inserted into the hole of the flange 5 on the seat side, while the stud 16 formed on the bottom portion 20 is inserted into the hole of the flange 6 on the backrest side.

  In recent years, miniaturization and weight reduction of a seat reclining device for a vehicle have been demanded due to a variety of seat layouts and a serious environmental problem. On the other hand, in order to ensure collision safety, the strength of the vehicle seat reclining device cannot be lowered, and there is a demand for downsizing and increasing the strength of the vehicle seat reclining device.

Japanese Patent Laid-Open No. 10-276850

  However, in the structure of the conventional vehicle seat reclining device, the studs 15 a and 15 b for preventing rotation provided on the cover 10 constituting the hinge 4 are larger than the pitch circle of the teeth 21 formed on the bottom portion 20. If the outer dimension of the hinge 4 is reduced, the distance from the center of the hinge 4 to the studs 15a and 15b is also reduced, and the coupling strength between the cover 10 and the seat-side flange 5 is reduced. Decreases. Moreover, since the stamping 12 for guiding the plate 40 is formed on the inner surface of the cover 10 and the stamping 12 and the studs 15a and 15b are in the front and back positional relationship and cannot be formed at the same position, the studs 15a and 15b. Cannot be increased, and therefore, the coupling strength between the cover 10 and the flange 5 cannot be sufficiently increased.

  SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide a vehicle seat reclining device in which the above-described problems are solved and a connecting portion between a base member and a base bracket is disposed on an outer periphery of the base member.

  The invention according to claim 1 is coupled to the base member coupled to either one of the base bracket coupled to the seat cushion side and the arm bracket coupled to the seat back side, and coupled to the other bracket. A rotating member that is positioned in the radial direction so as to be relatively rotatable with respect to the base member, a circular recess is formed on the base member side, and an internal gear is formed on an inner peripheral surface of the circular recess, and the rotating member A holder that is positioned relative to the base member in the axial direction and an external gear that can mesh with the internal gear, and the external gear is movable in a direction that engages and disengages the internal gear. A lock tooth, a guide protrusion formed on the rotating member side of the base member to guide the lock tooth, and pressing the lock tooth to move the external gear to the internal gear. In a vehicle seat reclining device including a cam for engaging or releasing meshing, a cylindrical protrusion that protrudes to the opposite side of the rotating member is formed on the outer periphery of the base member, and the cylinder is formed on the one bracket. Forming a circular protrusion that fits inside the protrusion, and forming a plurality of through holes along the outer peripheral surface of the circular protrusion, and connecting the inner surface of the through hole and the end surface of the cylindrical protrusion. It is characterized by being welded.

  According to this invention, when a rotational force acts on the base member, the rotational force acts on one bracket from the cylindrical projection of the base member via the welded portion, and the outer periphery of the base member A shearing force in the circumferential direction acts on the welded portion located in the portion. On the other hand, conventionally, since a plurality of non-rotating projections were formed on the outer surface of the base member, it was impossible to form a guide projection for guiding the lock tooth on the back side of the non-rotating projections. Since it is not necessary to provide the rotation prevention convex part, it is possible to form a guide protrusion part large.

  According to a second aspect of the present invention, in the vehicle seat reclining device according to the first aspect, a plurality of engaging convex portions projecting radially inward are formed in the cylindrical projecting portion of the base member along the circumferential direction. On the other hand, an engagement recess for fitting the engagement protrusion is formed radially inwardly on the outer peripheral portion of the circular protrusion of the one bracket.

  According to the present invention, the engagement projection formed to protrude inward in the radial direction on the cylindrical projection of the base member meshes with the engagement recess formed on the outer peripheral portion of the circular projection of one bracket, A rotational force is transmitted from the base member to one of the brackets through the meshing portion.

  According to the vehicle seat reclining device of the first aspect, since the welded portion on which the large load acts is located on the outer peripheral portion of the base member, the circumferential shearing force acting on the welded portion is small, The bond strength with the bracket is large. Further, since the guide protrusion can be formed large, the holding force of the lock tooth by the guide protrusion can be increased, and the lock strength of the rotating member with respect to the base member can be increased.

  According to the vehicle seat reclining device according to claim 2, in addition to the welded portion, the engagement protrusion formed on the cylindrical protrusion of the base member so as to protrude radially inward is a circular protrusion of one bracket. Since the relative rotation between the base member and the one bracket is restricted by fitting into the engaging recess formed in the outer peripheral portion of the base member, the coupling strength between the base member and the one bracket is claimed in claim 1. It is larger than the seat reclining device of the vehicle.

1 is an exploded perspective view of a vehicle seat reclining device (Embodiment 1). FIG. Sectional drawing of the vehicle seat reclining apparatus (Embodiment 1). The block diagram which removes the cover body of the seat reclining device of a vehicle, and shows (Embodiment 1). 1 is an external view of a vehicle seat reclining device (Embodiment 1). Sectional drawing which shows the principal part of the seat reclining apparatus of a vehicle (Embodiment 2). The disassembled perspective view which shows the principal part of the seat reclining apparatus of a vehicle (Embodiment 3). Sectional drawing which shows the principal part of the seat reclining apparatus of a vehicle (Embodiment 3). The block diagram which removes the cover body of the seat reclining apparatus of a vehicle, and shows (Embodiment 3). Sectional drawing which shows the principal part of the seat reclining apparatus of a vehicle (Embodiment 4).

Embodiments of a vehicle seat reclining device according to the present invention will be described below.
(A) Embodiment 1
First, the first embodiment will be described with reference to FIGS.

  As shown in FIG. 4, a seat cushion 2 that is a sitting portion is provided, and a seat back 3 is attached to a rear portion of the seat cushion 2 via a seat reclining device so as to be rotatable in the front-rear direction of the vehicle. The seat reclining device has a machine frame 5 coupled to a base bracket 4 coupled to the seat cushion 2 side, and a lid body 7 coupled to an arm bracket 6 coupled to the seat back 3 side. The recliner 1 is constituted by the frame 5 and the lid body 7 and the like. A spring (not shown) is provided to bias the seat back 3 toward the front of the vehicle with respect to the seat cushion 2.

  The structure of the recliner 1 will be described with reference to FIGS. As shown in the sectional view of FIG. 2, the recliner 1 includes the machine frame (base member) 5, the lid (rotating member) 7, and the like. The machine frame 5 is formed with a center hole 5d by pressing, and a cylindrical projection 5b protruding in the axial direction on the outer peripheral portion of the right outer surface of the machine frame 5 on the side opposite to the lid 7 in the drawing. It is formed by punching. On the other hand, a central hole 7i is formed in the lid 7, and a circular recess 7b is formed by bending the outer peripheral portion of the disk by forging to form a cylindrical portion 7a. An internal gear 7c is formed on the inner peripheral surface of the cylindrical portion 7a. The lid body 7 is positioned in the radial direction so as to be coaxial and relatively rotatable with respect to the machine casing 5. In order to position the lid 7 in the radial direction with respect to the machine frame 5, as shown in FIG. 2, the machine frame 5 side extends in the axial direction from the position of the internal gear 7c in the cylindrical portion 7a of the lid 7. As a result, a cylinder tip 7d is formed, and the inner peripheral surface of the cylinder tip 7d is used as a lid sliding surface 7e. A notch 5e is formed, and an outer peripheral surface of the circumferential notch 5e is a machine frame sliding surface 5a that slides on the lid sliding surface 7e. In order to position the lid 7 in the axial direction with respect to the machine frame 5, a cylindrical holder 8 that covers the outer peripheral surface of the lid 7 is provided, and one end 8 a of the holder 8 is attached to the machine frame 5. Are combined. That is, a circumferential notch 5f is formed on the outer peripheral surface of the cylindrical projection 5b in the machine frame 5, and one end 8a of the holder 8 is fitted into the circumferential notch 5f. The end 8 a is coupled to the machine casing 5. That is, by irradiating laser from the outer peripheral surface of the holder 8 toward the center in the radial direction, one end portion 8a of the holder 8 and the machine frame 5 are welded. The other end of the holder 8 is bent toward the center in the radial direction, and an axial direction restricting portion 8b for restricting the lid body 7 in the axial direction is formed.

  A coupling structure between the machine casing 5 and the base bracket 4 constituting the recliner 1 will be described below. In this embodiment, a base bracket 4 having a thickness slightly smaller than the thickness of the machine frame 5 is used. The base bracket 4 has a center hole 4d and a circular protrusion 4a fitted inside the cylindrical protrusion 5b of the machine frame 5 half-cut by press. The circular protrusion 4a may have a disk shape in which the entire circular protrusion 4a is fitted inside the cylindrical protrusion 5b as in the present embodiment, or the outer periphery of the circular protrusion 4a. A cylindrical shape in which only the portion is fitted inside the cylindrical protrusion 5b may be used. A plurality of long through holes 4b are formed along the circumferential direction at positions corresponding to the outer peripheral surface of the circular protrusion 4a. The through-hole 4b is disposed at a position including a step which is the position of the outer peripheral surface of the circular protrusion 4a. The inner surface of the through-hole 4b on the outer peripheral side in the radial direction is the outer peripheral surface of the cylindrical protrusion 5b of the machine frame 5 Is set slightly inside. And as shown in FIG. 2, the inner surface of the outer side of this through-hole 4b and the end surface of the cylindrical projection part 5b are weld-joined. By this welding, the inner surface on the outer side of the through-hole 4b and the end surface of the cylindrical projection 5b are joined via the welded portion 13. As shown in FIG. 3, six through holes 4b and welds 13 are formed at equal intervals along the circumferential direction in the present embodiment.

  On the other hand, the structure for connecting the lid body 7 and the arm bracket 6 constituting the recliner 1 is the same as the conventional structure, and a plurality of structures are formed on the outer surface of the lid body 7 along the circumferential direction in FIG. The anti-rotation convex portions 7g are respectively fitted in fitting holes (not shown) of the arm bracket 6 (not shown in FIG. 2).

  Next, the internal structure of the recliner 1 will be described. As shown in FIG. 2, a cam 9 is rotatably disposed in the circular recess 7b between the machine casing 5 and the lid body 7 in the axial direction. A pair of lock teeth 10 is disposed at an obliquely vertical position. In order to guide the lock tooth 10 in a swingable manner along an arcuate trajectory centered on the upper right and lower left portions of FIG. 3, shaft projections 11 serving as swing centers are formed integrally with the machine frame 5, respectively. An inner peripheral guide surface 11 a is formed on the outer peripheral portion of the shaft protrusion 11. On the other hand, on the outer peripheral side in the vicinity of both ends of the arcuate track for guiding the lock tooth 10 so as to be swingable along the arcuate track, a pair of first guide projections 12A serving as guide projections at positions sandwiching the shaft projection 11. And the second guide protrusion 12 </ b> B are formed integrally with the machine casing 5. A first outer peripheral guide surface 12a and a second outer peripheral guide surface 12b are formed on the first guide protrusion 12A and the second guide protrusion 12B. On the other hand, the lock tooth 10 includes a first sliding outer peripheral surface 10a and a second sliding outer peripheral surface 10b that slide with the first outer peripheral guide surface 12a and the second outer peripheral guide surface 12b, respectively, and the inner peripheral guide surface. 11a and a sliding inner peripheral surface 10c that slides are formed.

  Since the lock tooth 10 swings along the arcuate path, the first outer circumferential guide surface 12a, the second outer circumferential guide surface 12b, the first sliding outer circumferential surface 10a, the second sliding outer circumferential surface 10b, and the inner circumferential guide surface. 11a and the sliding inner peripheral surface 10c are formed in the circular arc shape coaxial with respect to the rocking center (not shown) of the lock tooth 10. An external gear 10d that can mesh with the internal gear 7c is formed on the surface of the lock tooth 10 that swings along the arcuate track and faces the internal gear 7c. In addition, a recess 10f is formed in the central portion on the outer peripheral side of the lock tooth 10 that swings along the arcuate track. A pressed part to be removed is formed.

  The cam 9 is provided to press the lock tooth 10 including the external gear 10d toward the internal gear 7c. The cam 9 is rotated counterclockwise in FIG. 3 about the center hole 9e, thereby pressing the pair of lock teeth 10 outwardly in the radial direction of the recliner 1 so that the external gear 10d becomes the internal gear 7c. It is possible to release the meshing by engaging with each other or rotating it clockwise. By meshing the external gear 10d with the internal gear 7c, the rotation of the lid body 7 with respect to the machine frame 5 is restrained, and the seat back 3 is held at a predetermined angular position with respect to the seat cushion 2.

  On the outer peripheral surface of the cam 9, there are a lock cam surface 9a for rocking the lock tooth 10 clockwise and meshing the external gear 10d with the internal gear 7c, and an external tooth by rocking the lock tooth 10 counterclockwise. An unlocking cam surface 9b for separating the gear 10d from the internal gear 7c is formed side by side. The left and right first guide protrusions 12A in FIG. 3 are formed with a sliding contact surface 12d parallel to a line connecting the upper and lower lock cam surfaces 9a, and are slidably contacted with the sliding contact surface 12d so In order to allow the cams 9 to rotate while restricting the movement of the cams 9, sliding outer peripheral surfaces 9 c are formed at positions where the cams 9 form 180 degrees. These sliding outer peripheral surfaces 9c are formed along an arc centered on the center hole 9e of the cam 9, and the sliding outer peripheral surface 9c is always in sliding contact with the sliding contact surface 12d of the first guide protrusion 12A. The movement of the cam 9 in the left-right direction is restricted and only the movement in the up-down direction is allowed. And the spring hook part 9d mentioned later is formed by notching the edge part of this sliding outer peripheral surface 9c in a step shape.

  In order to urge the cam 9 in the locking direction, a torsion coil spring 19 is disposed between the pair of the first guide protrusion 12A and the second guide protrusion 12B adjacent in the circumferential direction. An operation lever 20 that rotates the cam 9 in the unlocking direction against the urging force of the torsion coil spring 19 is provided. This will be described in detail below.

  Arc recesses 12e and 12e are formed on the surfaces of the first guide protrusion 12A of one set adjacent to each other in the circumferential direction and the second guide protrusion 12B of the other set, and the arc recesses 12e facing each other. And the arc recess 12e are formed such that the radial outer periphery is wide and the center is narrow. For this reason, a substantially semicircular spring accommodating space 21 is formed on the radially outer peripheral side, while convex portions 12c facing each other are formed on the end portion on the radial center side. A cylindrical winding portion 19 c of the torsion coil spring 19 is accommodated in the spring accommodating space 21. Engaging portions 19a and 19b having different lengths are formed by bending both ends of the winding portion 19c of the torsion coil spring 19 wound in a coil shape to the outside, and the engaging portions 19a and 19b are opened in a mutual opening direction. By being urged, the respective engaging portions 19 a and 19 b are engaged with the respective convex portions 12 c to hold the torsion coil spring 19, and the distal end portion of the longer engaging portion 19 b is the spring of the cam 9. The cam 9 is engaged with the hook portion 9d to urge the cam 9 in the locking direction.

  The torsion coil spring 19 is arranged so that the axis of the winding part 19c and the axis of the machine frame 5 are substantially parallel, and the shorter engaging part 19a is the axis of the machine frame 5 as shown in FIG. Is located on the base bracket 4 side in the direction, while the longer engagement portion 19b is located on the lid body 7 side, and the longer engagement portion 19b is opposite from the lid body 7 side as shown in FIG. Bending toward the machine frame 5 on the side is formed in a “h” shape. The longer engaging portion 19b is hung on the spring hook portion 9d formed on the outer peripheral surface of the cam 9 as described above. A ring-plate-like regulating member 17 is attached to the lid body 7 in order to regulate the longer engaging portion 19b in the axial direction. That is, as shown in FIG. 2, a cylindrical portion 7 f that protrudes in the axial direction is formed on the inner surface of the lid body 7, and a portion of the cylindrical portion 7 f is fitted into the inside of a ring-plate-shaped regulating member 17.

The recliner 1 configured in this manner is disposed on both sides of the seat cushion 2 in the width direction, and the serrations (not shown) formed on the operation shaft 15 of FIG. 4 in the shaft holes 9e of the cams 9 of the left and right recliners 1. Are individually inserted, and the ends of the operation shaft 15 are connected to each other via a connecting shaft (not shown). As shown in FIG. 4, an operation lever 20 is attached to the open end of one operation shaft 15.
(Function)
Next, the operation of the seat reclining device will be described.

  In the state where the recliner 1 is assembled to the seat, the cam 9 is rotated counterclockwise by the urging force of the torsion coil spring 19 as shown in FIG. The lock tooth 10 is pressed by the surface 9a, and the lock tooth 10 is guided by the inner peripheral side guide surface 11a, the first outer peripheral side guide surface 12a, and the second outer peripheral side guide surface 12b and swings clockwise, and the external gear 10d. Is meshed with the internal gear 7 c of the lid 7. That is, in FIG. 4, the rotation of the seat back 3 is restricted.

  Next, when the operation lever 20 is rotated clockwise in FIG. 4, the operation shaft 15 is rotated, and the cam 9 that rotates integrally with the operation shaft 15 resists the biasing force of the torsion coil spring 19. The lock cam surface 9a of the cam 9 and the lock tooth 10 are disengaged, and the lock release cam surface 9b presses the lock tooth 10 counterclockwise. For this reason, the lock tooth 10 swings counterclockwise about the shaft projection 11 and the meshing between the external gear 10d and the internal gear 7c is released, and the lock 7 is unlocked, and the lid 7 shown in FIG. The arm bracket 6 and the seat back 3 to which the are attached are rotated forward by a biasing force of a spring (not shown).

  When the seat back 3 is rotated in the backward direction against the biasing force of a spring (not shown) and the hand is released from the operation lever 20 in a state where the seat back 3 is at a desired angular position, the torsion coil spring 19 is released. The urging force of the cam 9 rotates counterclockwise, and the lock cam surface 9 a of the cam 9 presses the lock tooth 10. For this reason, the external gear 10d of the lock tooth 10 meshes with the internal gear 7c and returns to the locked state of FIG.

  According to the present invention, when a force for rotating the seat back acts on the lid body 7 via the arm bracket 6 and acts on the machine casing 5 from the lid body 7 via the lock tooth 10, a rotational force is exerted on the machine casing 5. The rotational force acts on the base bracket 4 via the welded portion 13 from the cylindrical projection 5b of the machine frame 5. The welded portion 13 is located on the outer peripheral portion of the machine frame 5 and radially outside the pitch circle of the internal gear 7 c, and a circumferential shearing force acts on the welded portion 13. Conventionally, since a plurality of anti-rotation projections were formed on the outer surface of the machine frame 5, a guide projection for guiding the lock tooth 10 could not be formed on the back side of the anti-rotation projections. Since it is not necessary to provide the rotation prevention convex part, it is possible to form a guide protrusion part large.

  That is, in the first embodiment, the torsion coil spring 19 is disposed between the first guide protrusion 12A and the second guide protrusion 12B, so the first guide protrusion 12A and the second guide protrusion 12B are connected to each other. However, the guide protrusion supporting the lock tooth 10 cannot be enlarged, but for example, the central hole 5d of the machine frame 5 in FIG. 2 is enlarged and a torsion coil spring is disposed inside the central hole 5d. By adopting a configuration in which one end of the torsion coil spring is hung inside the center hole 5d and the other end is hung on the cam 9, the first guide protrusion 12A and the second guide protrusion 12B are connected to each other to connect the guide protrusion. It is also possible to increase the strength of the recliner 1 by increasing the holding force of the lock tooth 10.

According to this seat reclining device, the welded portion 13 to which the shearing force in the circumferential direction acts is located on the outer peripheral portion of the machine frame 5 and radially outside the pitch circle of the internal gear 7c. The shearing force acting in the circumferential direction is small, and the coupling strength between the machine frame 5 and the base bracket 4 is large. Further, since the guide projection can be formed on the back side of the position where the conventional anti-rotation projection has been provided, the holding force of the lock tooth 10 by the guide projection can be increased, and the lid 7 with respect to the machine frame 5 can be increased. The lock strength can be increased.
(B) Embodiment 2
Next, a second embodiment will be described. Since the second embodiment is obtained by changing only the through-hole portion of the coupling structure between the machine frame and the base bracket in the first embodiment, the same portions are denoted by the same reference numerals and description thereof is omitted. Only different parts will be described.

  FIG. 5 shows a modification of FIG. 2 in the first embodiment. A plurality of long through-holes 4b formed along the outer peripheral surface of the circular protrusion 4a of the base bracket 4 are formed by moving outward in the radial direction. That is, the through hole 4b is formed in a state where the inner surface on the center side in the radial direction of the through hole 4b is aligned with the outer peripheral surface of the circular protrusion 4a. In this case, the inner surface on the outer peripheral side in the radial direction of the through hole 4 b may be disposed outside the outer peripheral surface of the machine frame 5. The inner surface on the center side of the through hole 4 b and the end surface of the cylindrical protrusion 5 b are joined via the welded portion 13.

Since other configurations and operations are the same as those of the first embodiment, description thereof is omitted.
(C) Embodiment 3
Next, Embodiment 3 will be described. In the third embodiment, since the concavity and convexity for restricting relative rotation of the machine frame and the base bracket in the first embodiment are formed in the joint portion, the same reference numerals are given to the same portions. Therefore, only the different parts will be described.

  As shown in FIG. 6, in the present embodiment, four engaging projections 5 c projecting inward in the radial direction are formed on the cylindrical projection 5 b of the machine frame 5 along the circumferential direction. . Since a concave portion is inevitably formed on the inner surface which is the back side of the portion where the engaging convex portion 5c is formed, the engaging convex portion 5c is the first guide in the circumferential direction of the machine frame 5. The protrusions 12 </ b> A, the second guide protrusions 12 </ b> B, and the shaft protrusions 11 are disposed at positions that do not exist. That is, as shown in FIG. 8, the engagement convex portion 5c is added to the back side of the portion where the torsion coil spring 19 is disposed and the back side near the portion where the external gear 10d of the lock tooth 10 is formed. Four are formed. On the other hand, as shown in FIG. 6, an engagement recess 4 c for fitting the engagement protrusion 5 c is formed radially inwardly on the outer peripheral portion of the circular protrusion 4 a of the base bracket 4. The engaging convex part 5c is fitted in the engaging concave part 4c.

  Since the engaging recesses 4c cannot be evenly arranged in the circumferential direction in the base bracket 4, and there are a wide space and a narrow space, as shown in FIG. It is long in the circumferential direction at a wide space between the engagement recesses 4c, and short in the circumferential direction at a narrow space. And the sum total of the circumferential length of the through-hole 4b and the welding part 13 is substantially the same as the sum total of the circumferential length of the through-hole 4b and the welding part 13 in Embodiment 1. .

  According to the present invention, the engagement protrusion 5 c formed to project radially inward from the cylindrical protrusion 5 b of the machine frame 5, and the engagement recess formed on the outer periphery of the circular protrusion 4 a of the base bracket 4. 4c meshes, and the rotational force is transmitted from the machine frame 5 to the base bracket 4 through the meshed portion. For this reason, when the force for rotating the seat back acts on the lid 7 via the arm bracket 6 and acts on the machine frame 5 via the lock tooth 10 from the lid 7, the rotation acting on the machine frame 5. The force is directly supported by the base bracket 4 provided on the seat cushion, and the load applied to the welded portion can be reduced.

  According to this vehicle seat reclining device, in addition to the welded portion 13, the engaging projection 5 c formed on the cylindrical projection 5 b of the machine frame 5 projecting radially inward is a circular projection of the base bracket 4. Since the relative rotation between the machine frame 5 and the base bracket 4 is restricted by fitting into the engagement recess 4c formed on the outer peripheral portion of 4a, the coupling strength between the machine frame 5 and the base bracket 4 is restricted. Is larger than the first and second embodiments.

Since other configurations and operations are the same as those of the first embodiment, description thereof is omitted.
(C) Embodiment 4
Finally, Embodiment 4 will be described. The fourth embodiment is different from the third embodiment in that the sliding portion for positioning the lid with respect to the machine frame in the radial direction is replaced by the inner part of the holder coupled to the machine frame instead of the outer peripheral surface of the machine frame. Since it is a peripheral surface, the same parts are denoted by the same reference numerals, description thereof is omitted, and only different parts are described.

  FIG. 9 shows a modification of part of the structure of FIG. 7 in the third embodiment. In this embodiment, since the lid body 7 does not slide with the machine casing 5, the cylinder tip portion 7d is not formed at the position of the cylindrical portion 7a of the lid body 7 and the internal gear 7c. Further, a single circumferential notch 5g is formed on the outer periphery of the machine casing 5, and no circumferential notch 5f is formed. Then, one end 8 a of the holder 8 is fitted into the outer peripheral surface of the circumferential notch 5 g, and the one end 8 a is laser welded to the outer peripheral surface of the machine frame 5. Inside the holder 8, the end surface of the cylindrical portion 7 a of the lid body 7 is in contact with the inner surface of the machine frame 5, and the outer peripheral surface of the cylindrical portion 7 a of the lid body 7 is a lid sliding surface 7 h. The body sliding surface 7 h is slidable with respect to the holder sliding surface 8 c which is the inner peripheral surface of the holder 8.

  As can be seen by comparing FIG. 9 which is the fourth embodiment with respect to FIG. 7 which is the third embodiment, the cylindrical protrusion which is a portion coupled via the welded portion 13 is slightly larger in the radial direction. Therefore, the strength of the machine casing 5 can be increased accordingly, and the coupling strength between the machine casing 5 and the base bracket 4 is increased.

  Since other configurations and operations are the same as those of the third embodiment, description thereof is omitted.

  In the third embodiment (FIG. 7) and the fourth embodiment (FIG. 9), as in the first embodiment (FIG. 2), the inner surface on the outer peripheral side in the radial direction of the through hole 4b and the cylindrical protrusion 5b. In the same manner as in the second embodiment (FIG. 5), the inner surface on the center side in the radial direction of the through hole 4b is aligned with the outer peripheral surface of the circular protrusion 4a, and the end face of the through hole 4b is aligned. The inner surface on the center side of the hole 4b and the end surface of the cylindrical protrusion 5b can be welded.

  In the first to fourth embodiments, the machine casing 5 is coupled to the base bracket 4 while the lid body 7 is coupled to the arm bracket 6. However, the attachment can be reversed. Moreover, although Embodiment 1-4 shows the case where an arc track | orbit is provided so that a lock tooth may move along a circular arc, it provides a straight track so that a lock tooth may move along a straight line in radial direction. You can also. Furthermore, in Embodiments 1 to 4, two lock teeth are arranged at intervals of about 180 degrees in the circumferential direction, but three or four lock teeth are arranged at equal intervals or unequal intervals in the circumferential direction. You can also.

DESCRIPTION OF SYMBOLS 4 ... Base bracket 4a ... Circular projection part 4b ... Through-hole 4c ... Engagement recessed part 5 ... Machine frame (base member)
5b ... Cylindrical protrusion 5c ... engagement convex part 6 ... arm bracket 7 ... lid (rotating member)
7b ... Circular recess 7c ... Internal gear 8 ... Holder 8b ... Axial restricting portion 9 ... Cam 10 ... Lock tooth 10d ... External gear 12A ... First guide protrusion (guide protrusion)
12B ... Second guide protrusion (guide protrusion)
13 ... welded part

Claims (2)

A base member coupled to one of a base bracket coupled to the seat cushion side and an arm bracket coupled to the seat back side, and coupled to the other bracket and rotated relative to the base member A rotating member which is freely positioned in the radial direction and has a circular recess formed on the base member side and an internal gear formed on the inner peripheral surface of the circular recess, and the rotating member is pivoted with respect to the base member A holder relatively positioned in the direction, an external gear that can mesh with the internal gear, a lock tooth that can move in a direction in which the external gear engages with and disengages from the internal gear, and guides the lock tooth Therefore, the guide protrusion formed on the rotating member side of the base member and the lock tooth are pressed to engage or release the external gear with the internal gear. The seat reclining apparatus for a vehicle and a cam which,
Forming a cylindrical protrusion that protrudes to the opposite side of the rotating member on the outer periphery of the base member, and forming a circular protrusion that fits inside the cylindrical protrusion on the one bracket, A vehicle seat reclining device, wherein a plurality of through holes are formed along an outer peripheral surface of the circular protrusion, and an inner surface of the through hole and an end surface of the cylindrical protrusion are joined by welding. In the vehicle seat reclining device according to claim 1,
A plurality of engaging projections projecting radially inward are formed on the cylindrical projection of the base member along the circumferential direction, while the engagement portion is formed on the outer periphery of the circular projection of the one bracket. A seat reclining device for a vehicle, characterized in that an engagement recess for fitting the mating projection is formed radially inward.

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