JP5467908B2 - 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 of FIG. 3 between a seat side flange 5 and a backrest side flange 6. The hinge 4 is configured as a circular unit (recliner), and includes a cover 10 and a bottom portion 20 that can rotate with respect to the cover 10 and can restrict rotation. As shown, a stud 15 protruding from the cover 10 is inserted into a hole in the seat-side flange 5, while a stud 16 protruding from the bottom 20 is inserted into a hole in the back-side flange 6.

  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 configuration of the conventional vehicle seat reclining device, the studs 15a and 15b for preventing rotation formed on the cover 10 that constitutes the hinge 4 are formed from 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 cover 10 and the flange 5 on the seat side are coupled. Strength 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.

  Further, there is a tendency to increase the axial dimension of the vehicle seat reclining device in order to reduce the diameter and increase the strength of the vehicle seat reclining device. Here, the seat reclining device of the vehicle is disposed between the base bracket and the arm bracket, and the base bracket and the arm bracket are attached to the seat reclining device with an offset by an axial thickness of the seat reclining device. Therefore, when the axial dimension of the seat reclining device of the vehicle is increased, the amount of this offset increases. For this reason, when a large load is applied to the arm bracket, the arm bracket may fall in the axial direction, or the arm bracket may be twisted with respect to the base bracket, causing a decrease in strength and operability of the seat reclining device. become.

  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 base bracket and an arm bracket are arranged close to each other.

  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. There is a rotating member that is rotatable relative to the base member, has a circular recess, and has an internal gear formed on the inner peripheral surface of the circular recess, and an external gear that can mesh with the internal gear. A lock tooth provided on the base member to be movable in a direction in which the external gear engages with and disengages from the internal gear; a guide protrusion formed on the base member for guiding the lock tooth; and the lock tooth. In a vehicle seat reclining device, comprising a cam that presses and engages or releases the external gear with the internal gear. A circumferential notch having an outer diameter dimension that is the same as or slightly larger than the outer diameter dimension of the rotating member is formed on the outer peripheral portion of the surface on the moving member side, and the rotating member is arranged in the radial direction with respect to the base member. A cylindrical regulating member that regulates in the axial direction is provided in a state of surrounding the rotating member, and one end portion of the regulating member is fitted into the circumferential cutout portion and welded to the base member, and the other A restricting portion that protrudes toward the inner peripheral side and slides on the outer surface in the axial direction of the rotating member is provided at the end of the first member, a through hole is formed in the one bracket, and the restricting member is fitted into the through hole. Then, the side surface of the one bracket and the outer peripheral surface of the base member are welded to each other.

  According to the present invention, when a large load is applied to the seat back and a large force is applied between the base member and the one bracket, the welded portion joins the outer peripheral surface of the base member and the one bracket. Thus, a circumferential shearing force acts on a portion located on the outer peripheral side in the radial direction from the base member. On the other hand, since a plurality of anti-rotation projections are conventionally formed on the outer surface in the axial direction of the base member, a guide projection for guiding lock teeth can be formed on the inner surface on the back side of the anti-rotation projections. However, in this invention, since the base member is not provided with the anti-rotation convex portion by providing the welded portion on the outer peripheral surface of the base member, the guide protrusion portion can be enlarged without considering the anti-rotation convex portion. Is possible.

  According to a second aspect of the present invention, in the vehicle seat reclining device according to the first aspect, the outer diameter of the base member is set larger than the outer diameter of the restricting member, and the outer peripheral portion of the base member is pressed. The circumferential notch is formed by half-cutting toward the counter-rotating member, the side surface of the one bracket is brought into contact with the side surface of the circumferential notch of the base member, and the one bracket is pivoted. It is characterized by being positioned in the direction.

  According to this invention, when welding the side surface of one bracket and the outer peripheral surface of the base member, the side surface of the one bracket is brought into contact with the side surface of the circumferential notch of the base member, and the one bracket is This is done with the axis positioned.

  According to the vehicle seat reclining device of the first aspect, since the welded portion on which a large load acts is located on the outer peripheral side in the radial direction with respect to the base member, the circumferential shearing force acting on the welded portion is small, The coupling strength between the base member and one of the brackets is large. In addition, since the base member is provided with a welded portion on the outer peripheral surface of the base member so that the non-rotating convex portion is not provided, the guide protrusion can be enlarged without considering the anti-rotating convex portion. By increasing the holding force of the lock tooth by the guide protrusion, the lock strength of the rotating member with respect to the base member can be increased. Furthermore, since the distance between the base bracket and the arm bracket is smaller than the axial thickness of the recliner, the base bracket and the arm bracket can be made closer to each other in the axial direction compared to the conventional case, and the offset amount between the two is small. When a large load is applied to the arm bracket, a decrease in operability due to the arm bracket falling in the axial direction or causing a twist is suppressed.

  According to the vehicle seat reclining device of the second aspect, the side surface of one bracket is brought into contact with the side surface of the circumferential notch of the base member, and the side surface of one bracket and the outer peripheral surface of the base member are welded. The positioning between the base member and one bracket during welding is easy, and the assemblability is improved.

Sectional drawing of the seat reclining apparatus of a vehicle. The block diagram which shows the seat reclining apparatus of a vehicle by fracture | rupturing a cover body. The disassembled perspective view of the seat reclining apparatus of a vehicle. The disassembled perspective view which decomposed | disassembled the vehicle seat reclining apparatus into the recliner and two brackets. 1 is an external view of a vehicle seat reclining device.

Embodiments of a vehicle seat reclining device according to the present invention will be described below.
(Constitution)
As shown in FIG. 5, 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 machine frame 5 is coupled to the base bracket 4 coupled to the seat cushion 2 side, and the lid body 7 is coupled to the arm bracket 6 coupled to the seat back 3 side. A recliner 1 of the seat reclining device is constituted by the lid (rotating member) 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. The machine frame 5 is formed by half-cutting a disk with a press, and an outer diameter of the machine frame 5 on the surface on the lid 7 side, which will be described later, is the same as or slightly larger than the outer diameter of the lid 7. A circumferential cutout portion 5a is formed, and a cylindrical outer peripheral portion 5b is formed by half blanking on the surface opposite to the circumferential cutout portion 5a. A central hole 5d is formed at the center of the machine casing 5. On the other hand, the lid body 7 is formed by bending the outer peripheral portion of the disk at a substantially right angle by forging to form a circular concave portion 7b, whereby a cylindrical portion 7a is formed, and an internal gear is formed on the inner peripheral surface of the cylindrical portion 7a. 7c is formed. A central hole 7 i is formed at the center of the lid 7. A cylindrical holder 8 is provided as a restricting member that restricts the lid 7 in the radial direction and the axial direction with respect to the machine frame 5. The holder 8 is provided so as to surround the lid body 7, and one end portion 8 a thereof is welded to the outer peripheral surface 5 c of the circumferential notch portion 5 a through the welded portion 14, and the other end portion is connected to the inner end portion. A restricting portion 8b that protrudes toward the peripheral side and slides on the outer surface in the axial direction of the lid body 7 is provided. The weld portion 14 is formed by laser welding in the radial direction from the outer peripheral surface of the holder 8 with one end portion 8a of the holder 8 fitted in the circumferential cutout portion 5a. A plurality of hemispherical abutting portions 8 c are formed on the inner surface in the axial direction of the restricting portion 8 b so as to make point contact with the outer surface in the axial direction of the lid 7 at substantially equal intervals along the circumference.

  A through-hole 4a is formed in the base bracket 4 by pressing, and the outer periphery of the holder 8 is fitted into the through-hole 4a. One side surface 4b of the base bracket 4 opposite to the regulating portion 8b and the machine frame 5 The outer peripheral surface 5e of the cylindrical outer peripheral portion 5b is welded through the welded portion 13 over the entire periphery. In this embodiment, the outer diameter of the outer peripheral surface 5e of the machine frame 5 is set larger than the outer diameter of the holder 8, and one side surface 4b of the base bracket 4 is connected to the circumferential notch 5a of the machine frame 5. The base bracket 4 is positioned and welded in the axial direction by contacting the side surface 5f.

  On the other hand, the structure for joining the lid body 7 and the arm bracket 6 constituting the recliner 1 is the same as that of the prior art. As shown in FIG. A plurality of anti-rotation projections 7g formed along the respective holes are fitted into the fitting holes 6a of the arm bracket 6 and welded.

  Next, the internal structure of the recliner 1 will be described. As shown in FIG. 1, a cam 9 is rotatably disposed in the center of 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 track centering on the upper right and lower left portions of FIG. 2, shaft protrusions (guide protrusions) 11 serving as swing centers are respectively integrated with the machine frame 5. An inner peripheral guide surface 11 a is formed on the outer periphery of the shaft projection 11. On the other hand, a pair of first guide protrusions (guide protrusions) are provided 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. 12A and the 2nd guide projection part (guide projection part) 12B are shape | molded integrally with the machine frame 5 inside the cylindrical part 5a. 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 inner peripheral guide surface 11a, the sliding inner peripheral surface 10c, the first outer peripheral guide surface 12a, The first sliding outer peripheral surface 10a, the second outer peripheral guide surface 12b, and the second sliding outer peripheral surface 10b are formed in a circular arc shape that is coaxial with a 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.

  The cam 9 is provided to press the lock tooth 10 having the external gear 10d toward the internal gear 7c. The cam 9 is rotated counterclockwise in FIG. 2 around the center hole 9e, thereby pressing the pair of lock teeth 10 outward 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 is a lock cam surface 9a for rocking the lock tooth 10 clockwise around the shaft projection 11 to engage the external gear 10d with the internal gear 7c, and rocking counterclockwise. Thus, an unlocking cam surface 9b for separating the external gear 10d from the internal gear 7c is formed side by side. A concave portion 10f is formed on the outer peripheral side of the lock tooth 10, and the portions of the lock cam surface 9a and the unlocking cam surface 9b of the cam 9 are inserted into the concave portion 10f, and the lock cam surface 9a, A pressed portion that is engaged with and disengaged from the unlocking cam surface 9b is formed.

  The left and right first guide protrusions 12A in FIG. 2 are respectively formed with sliding contact surfaces 12d parallel to the line connecting the upper and lower lock cam surfaces 9a of the cam 9, and are in sliding contact with the sliding contact surfaces 12d. In order to be able to rotate, sliding outer peripheral surfaces 9c are formed at positions where the cams 9 form 180 degrees with each other. 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, and convex portions 12c facing each other are formed on the end portion on the radially central 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. On the other hand, the longer engaging portion 19b is located on the lid body 7 side, and the longer engaging portion 19b is directed from the lid body 7 side to the machine frame 5 on the opposite side. It is bent into the shape of “he”. 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. Then, in order to restrict the longer engagement portion 19b in the axial direction, a ring plate-like restriction member 17 is fitted to the cylindrical portion 7f protruding in the axial direction from the inner surface of the lid body 7, and the restriction member 17 is long. One of the engaging portions 19b is in contact.

The recliner 1 configured in this manner is arranged on both sides of the seat cushion 2 in the width direction, and the operation shaft 15 of FIG. 5 is fitted into the shaft hole 9e of the cam 9 in the left and right recliners 1 via serrations. The inner end portions of the operation shaft 15 are connected to each other via a connection shaft (not shown). As shown in FIG. 5, an operation lever 20 is attached to the outer end portion of one operation shaft 15 via a serration (not shown).
(Function)
Next, the operation of the seat reclining device will be described.

  When the recliner 1 is assembled to the seat, the cam 9 is rotated counterclockwise by the biasing 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 around the shaft protrusion 11. The external gear 10d is in mesh with the internal gear 7c of the lid 7. That is, in FIG. 5, the rotation of the seat back 3 is restricted.

  Next, when the operation lever 20 is rotated in the clockwise direction in FIG. 5, 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 in the counterclockwise direction with the shaft protrusion 11 as the center. For this reason, in the lock tooth 10, the external gear 10d is released from the meshing with the internal gear 7c to be unlocked, and the arm bracket 6 and the seat back 3 in FIG. It is turned forward by the urging force.

  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. Therefore, the external gear 10d of the lock tooth 10 meshes with the internal gear 7c and returns to the locked state shown in FIG.

  According to the present invention, when a large load acts on the seat back 3 and a large force acts between the machine casing 5 and the base bracket 4, the outer peripheral surface 5 e of the machine casing 5 and the base bracket 4 are coupled. A circumferential shearing force acts on the welded portion 13 that is located on the outer peripheral side of the machine frame 5 in the radial direction. On the other hand, since a plurality of anti-rotation convex portions similar to the anti-rotation convex portions 7g of the lid body 7 shown in FIG. 3 are conventionally formed on the outer surface of the machine frame 5 in the axial direction, this is the back side of the anti-rotation convex portions. Although the shaft protrusion 11, the first guide protrusion 12A, and the second guide protrusion 12B for guiding the lock tooth 10 could not be formed large on the inner surface, in this invention, the welded portion is formed on the outer peripheral surface 5c of the machine frame 5. Since the machine frame 5 is not provided with the anti-rotation convex portion by providing 13, the shaft projection portion 11, the first guide projection portion 12A, and the second guide projection portion 12B are enlarged without considering the anti-rotation projection portion. Is possible.

  According to this vehicle seat reclining device, since the welded portion 13 to which a large load acts is located on the outer peripheral side in the radial direction with respect to the machine frame 5, the shearing force in the circumferential direction acting on the welded portion 13 is small, and the machine The bonding strength between the frame 5 and the base bracket 4 is high. Further, since the machine frame 5 is provided with the non-rotating convex portion by providing the welded portion 13 on the outer peripheral surface 5e of the machine frame 5, the shaft protrusion 11 and the first guide are not considered without considering the anti-rotating convex portion. The protrusion 12A and the second guide protrusion 12B can be enlarged, and the holding force of the lock tooth 10 by these guide protrusions can be increased to increase the lock strength of the lid 7 with respect to the machine frame 5. it can. Further, since the distance between the base bracket 4 and the arm bracket 6 is smaller than the axial thickness of the recliner 1, the base bracket 4 and the arm bracket 6 can be brought closer to each other in the axial direction as compared with the conventional case, and the offset between the two. Since the amount is small, when the arm bracket 6 is subjected to a large load, a decrease in operability due to the arm bracket 6 falling in the axial direction or causing a twist is suppressed.

  According to the present invention, when the one side surface 4b of the base bracket 4 and the outer peripheral surface 5e of the machine frame 5 are welded, the one side surface 4b of the base bracket 4 is brought into contact with the side surface 5f of the circumferential notch 5a. The base bracket 4 is positioned in the axial direction.

  According to this vehicle seat reclining device, the one side surface 4b of the base bracket 4 is brought into contact with the side surface 5f of the circumferential notch 5a so that the one side surface 4b of the base bracket 4 and the outer peripheral surface 5e of the machine frame 5 are connected. Since welding is performed, positioning between the machine frame 5 and the base bracket 4 at the time of welding is easy, and assemblability is improved.

  In addition, in this Embodiment, although the weld part 13 was provided over the perimeter, you may provide this weld part 13 partially. Further, in the present embodiment, 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. Although this embodiment shows the case where the arc tooth is provided so that the lock tooth swings along the arc, the straight tooth path may be provided so that the lock tooth moves along the straight line in the radial direction. it can. Further, in the present embodiment, two lock teeth are arranged at intervals of about 180 degrees in the circumferential direction, but three or four lock teeth can be arranged at equal intervals or unequal intervals in the circumferential direction. .

DESCRIPTION OF SYMBOLS 2 ... Seat cushion 3 ... Seat back 4 ... Base bracket 4a ... Through-hole 4b ... One side surface 5 ... Machine frame (base member)
5a ... Circumferential cutout portion 5e ... Outer peripheral surface 6 ... Arm bracket 7 ... Lid (rotating member)
7b: Circular recess 7c: Internal gear 8 ... Holder (regulating member)
8b ... Regulator 9 ... Cam 10 ... Lock tooth 10d ... External gear 11 ... Shaft protrusion (guide protrusion)
12A ... 1st guide protrusion (guide protrusion)
12B ... Second guide protrusion (guide protrusion)
13, 14 ... welds

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 rotatable member having a circular recess and an internal gear formed on an inner peripheral surface of the circular recess; and an external gear that can mesh with the internal gear. A lock tooth provided on the base member so as to be movable in a direction to be engaged with and disengaged from the tooth gear, a guide protrusion formed on the base member for guiding the lock tooth, and pressing the lock tooth to move the external gear. In a seat reclining device for a vehicle provided with a cam for meshing with or disengaging from the internal gear,
A circumferential notch having an outer diameter that is the same as or slightly larger than the outer diameter of the rotating member is formed on the outer peripheral portion of the surface of the base member on the rotating member side, A cylindrical restricting member for restricting the rotating member in the radial direction and the axial direction is provided in a state surrounding the rotating member, and one end portion of the restricting member is fitted into the circumferential notch, and the base member is provided. The other end is provided with a restricting portion that protrudes toward the inner peripheral side and slides with the axially outer surface of the rotating member, and a through hole is formed in the one bracket. A seat reclining device for a vehicle, wherein the regulating member is fitted and the side surface of the one bracket and the outer peripheral surface of the base member are welded. In the vehicle seat reclining device according to claim 1,
The outer circumferential dimension of the base member is set to be larger than the outer diameter dimension of the regulating member, and the circumferential notch is formed by half-cutting the outer circumferential portion of the base member toward the counter-rotating member by pressing. A seat reclining device for a vehicle, wherein a side surface of the one bracket is brought into contact with a side surface of the circumferential notch of the base member, and the one bracket is positioned in the axial direction.

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