JP2010051421A - Vehicle seat reclining device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To make a pair of lock teeth not have delay in lock timing. <P>SOLUTION: A vehicle seat reclining device includes: a machine casing 5; a cover 7 having an internal gear 7a; a pair of the lock teeth 10 having an external gear 10d and being swingable along a circle-arc trajectory; a pair of shafts 11 forming a guide face of a center side of the trajectory; first and second guide part 12A and 12B forming guide faces of outer peripheral sides; a cam 9 having press parts 9f for pressing the teeth 10 and supported to be shiftable in a radial direction in which the press parts 9f connected each other; and a pair of compression springs 19 provided between the cam 9 and the teeth 10, of which each one end indirectly energizes each of the teeth 10 via the cam 9 in a lock direction and the other end directly energizes the tooth 10 in the lock direction. The one end 19a of the spring 19 is hung on a diagonal position of the cam 9, and the other end 19b is hung on a retaining hole 10e of the tooth 10, respectively. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a seat reclining device for a vehicle, which is an improved spring configuration.

  A seat back serving as a backrest with respect to a seat cushion serving as a seating surface is rotatably provided on a vehicle seat. And in order to be able to adjust the angle of a seat back, the seat reclining apparatus of the vehicle is provided.

  As a conventional vehicle seat reclining device, for example, a device disclosed in Patent Document 1 is known. As shown in FIG. 3 of Patent Document 1, the cover plate 14 attached to the seat cushion 13 and the housing 12 attached to the seat back 15 are configured to be relatively rotatable, and the urging force of the single spiral spring 22 is configured. The toothed surfaces 40 of the three claws 16 provided in the housing 12 are pressed and meshed with the teeth 60 on the inner peripheral surface of the cover plate 14 by the cam 18 that is rotated clockwise by The relative rotation of the cover plate 14 is restricted, and the angular position of the seat back 15 is maintained.

In the vehicle seat reclining device, when the axial center position of the cam 18 is fixed, the toothed surface 40 of the three claws 16 is pressed against the teeth 60 on the inner peripheral surface of the cover plate 14 and does not mesh. Therefore, the cam 18 is configured to be able to move in the radial direction with respect to the camshaft so as to mesh evenly.
JP 2002-521165 A

  However, since the cam can move in the radial direction with respect to the cam shaft, when the single spiral spring 22 is provided, the point of action of the spiral spring 22 that urges the cam to rotate is one place on the circumference. Therefore, not only the rotational force that rotates the cam but also the pressing force that presses the cam in the radial direction acts simultaneously. For this reason, the cam slightly moves in the radial direction, the timing of locking by the three claws arranged in the circumferential direction is shifted, and the feeling when locking is lowered.

  Further, since the accommodating space is formed in the axial direction and the spiral spring is arranged in the accommodating space, an axial gap is generated in a portion where the spiral spring does not exist, and the cam and the claw escape to the gap. Therefore, the meshing between the toothed surface of the claw and the teeth on the inner peripheral surface of the cover plate becomes weak, and the meshing amount is different depending on the position in the circumferential direction and the meshing balance is lost.

  SUMMARY OF THE INVENTION Accordingly, it is an object of the present invention to provide a vehicle seat reclining device that solves the above-described problems and does not cause a lock timing shift in the circumferential direction without a pressing force that presses the cam in the radial direction. To do.

  According to a first aspect of the present invention, there is provided a base member coupled to one of a seat cushion and a seat back fixed to be rotatable with respect to the seat cushion, and a base member coupled to the other and the base member. A rotating member having an internal gear on the inner peripheral surface and an external gear that can mesh with the internal gear, and the external gear engages and disengages with the internal gear. A pair of lock teeth swingable in a direction along the arcuate track, a pair of shafts formed integrally with the base member and forming a central guide surface of the arcuate track, and an outer peripheral guide surface of the arcuate track And a pair of guide portions integrally formed with the base member in the vicinity of both ends of the circular arc track, and pressing portions for pressing the respective lock teeth, and the external gear is meshed with the internal gear. The A vehicle seat reclining device comprising a cam that clicks and unlocks, and a spring that biases the cam in the locking direction, and the cam is supported so as to be movable in a radial direction connecting the pressing portions. , A pair of arc-shaped compression springs are provided between the cam and the lock tooth, and one end of each compression spring is hooked on the diagonal position of the cam, and the other end is caused to make one round in the circumferential direction. The lock tooth is hung on a locking hole formed at a position on the external gear side of the lock tooth.

  According to this invention, since the urging force of the pair of compression springs provided between the cam and the lock tooth respectively acts on the diagonal position of the cam, only the urging force for rotating the cam acts, The biasing force that moves the cam in the radial direction does not act. Therefore, there is no possibility that the lock timing of the pair of lock teeth aligned in the circumferential direction is shifted due to the cam moving in the radial direction. Further, since the biasing force of the compression spring is indirectly transmitted from one end to the lock tooth via the cam and directly from the other end to the lock tooth, the biasing force of the compression spring is transferred from the two directions of the one end and the other end to the lock tooth. Therefore, the pressing force that presses the external tooth gear of the lock tooth against the internal gear of the rotating member is large, and the meshing force is large.

  The invention according to claim 2 is the vehicle seat reclining device according to claim 1, wherein one of the compression springs occupies a diagonal position with respect to the axis of the cam, and the other pressing portion on the other side of the cam. And the one side lock tooth, and the other compression spring covers the pressing portion on one side of the cam and the lock tooth on the other side.

  According to this invention, since the pair of pressing portions and the pair of lock teeth of the cam are covered by the pair of compression springs, the cam and the pair of lock teeth are restricted from moving in the axial direction.

  According to a third aspect of the present invention, in the vehicle seat reclining device according to the first or second aspect, the pair of compression springs are axially disposed between the pair of compression springs and the rotating member in the axial direction. A pressing plate for regulating is provided, and the pressing plate is attached to the rotating member.

  According to the present invention, the pair of compression springs are restricted in the axial direction by the pressing plate, and the cam and the pair of lock teeth are restricted in the axial direction by the pair of compression springs.

  According to the vehicle seat reclining device of the first aspect, the pair of arc-shaped compression springs are provided between the cam and the lock tooth, and one end of each compression spring is hooked on the diagonal position of the cam. Only the urging force for rotating the cam acts, and the urging force for moving the cam in the radial direction does not act, and the cam moves in the radial direction, so that the lock timing of the pair of lock teeth aligned in the circumferential direction There is no risk of deviation. Therefore, the feeling does not decrease when locking. Further, since the biasing force of the compression spring is indirectly transmitted from one end to the lock tooth via the cam and directly from the other end to the lock tooth, the biasing force of the compression spring is transferred from the two directions of the one end and the other end to the lock tooth. Therefore, the pressing force that presses the external tooth gear of the lock tooth against the internal gear of the rotating member is large, and the meshing force is large.

  According to the vehicle seat reclining device of the second aspect, since the pair of pressing portions of the cam and the pair of lock teeth are covered by the pair of compression springs, the cam and the pair of lock teeth are restricted from moving in the axial direction. Is done.

  According to the vehicle seat reclining device of the third aspect, since the pressing plate is provided, the pair of compression springs, and further the cam and the pair of lock teeth are restricted in the axial direction.

Embodiments of a vehicle seat reclining device according to the present invention will be described below.
(Constitution)
As shown in FIG. 6, a seat cushion 2 that is a sitting portion is provided, and a seat back 3 is attached to the seat cushion 2 so as to be rotatable in the front-rear direction of the vehicle. A machine frame (base member) 5 is coupled to the seat cushion 2 via a cushion side arm 4, and a lid (rotating member) 7 (not shown) is coupled to the seat back 3 via a back side arm 6. ing. A spring (not shown) that biases the seat back 3 toward the left side that is the front of the vehicle is provided with respect to the seat cushion 2.

  The machine casing 5 and the lid body 7 constitute a vehicle seat reclining device 1 shown in FIGS. The vehicle seat reclining device 1 will be described below. As shown in FIG. 2, the machine frame 5 has a circular recess formed by half-cutting the inside of the disk by pressing, while the lid 7 has a circular recess formed by forging the outer periphery of the disk into a flange shape by forging. An internal gear 7a is formed on the inner peripheral surface of the circular recess. A lid 7 is fitted into the circular recess of the machine frame 5 so as to be coaxial and relatively rotatable. And the outer peripheral part of the cover body 7 and the machine frame 5 is clamped by the ring-shaped holder 8, and, thereby, the cover body 7 and the machine frame 5 are hold | maintained so that relative rotation is possible, without isolate | separating to an axial direction. . A rotary cam 9 is arranged in the center between the machine frame 5 and the lid 7, and a pair that can swing along an arc track on the upper right and lower left sides of the cam 9 in FIG. 1. The lock tooth 10 is arranged.

  A substantially cylindrical shaft portion 11 having a center-side guide surface 11 a is formed integrally with the machine frame 5 on the inner peripheral side of the arcuate track for guiding the lock tooth 10 in a swingable manner. The bearing surface 10c is formed by cutting out a part of the substantially circular shape. On the other hand, first and second guide projections (guide portions) 12A for guiding the lock tooth 10 are provided on the outer peripheral side in the vicinity of both ends of the arc track for swingably guiding the lock tooth 10 along the arc track. 12B is formed integrally with the machine casing 5, and first and second outer peripheral guide surfaces 12a and 12b are formed on the first and second guide convex portions 12A and 12B. The lock tooth 10 is formed with first and second sliding outer circumferential surfaces 10a and 10b that slide with the first and second outer circumferential guide surfaces 12a and 12b. Since the lock tooth 10 swings along the circular arc track, the first and second outer peripheral guide surfaces 12 a and 12 b and the first and second sliding outer peripheral surfaces 10 a and 10 b are coaxial with respect to the center of the shaft portion 11. The arc shape is formed. An external gear 10d that can mesh with the internal gear 7a is formed on the surface of the lock tooth 10 that swings along the arcuate track and faces the internal gear 7a.

  Thus, the cam 9 is provided to press and pull the lock tooth 10 having the external gear 10d engaged with and disengaged from the internal gear 7a toward and disengage from the internal gear 7a. ing. By rotating the cam 9 counterclockwise in FIG. 1, the pair of lock teeth 10 are pressed radially outward to engage the external gear 10d with the internal gear 7a. Is formed. Further, in order to release the meshing by rotating the cam 9 clockwise, the cam 9 is formed with a lock releasing cam surface 9b. The lock cam surface 9a and the lock release cam surface 9b are respectively formed in a pressing portion 9f having a large outer diameter formed on the cam 9 at an interval of 180 degrees. By meshing the external gear 10d with the internal gear 7a, the rotation of the lid 7 with respect to the machine frame 5 is restricted, and the seat back 3 is held at a predetermined angular position with respect to the seat cushion 2.

  In the pair of lock teeth 10, the cam 9 is arranged in a radial direction with respect to the center of the circular recess of the machine frame 5 so that the external gear 10 d is not pressed and engaged with the internal gear 7 a. 1 so that it does not move in the left-right direction in FIG. 1, and can move in the up-down direction in FIG. 1 and in the direction connecting the pressing portions 9f of the lock teeth 10 pressed against the lock cam surface 9a. It is configured. That is, the left and right sides of the cam 9 in FIG. 1 are formed with a sliding outer peripheral surface 9c formed in an arc shape centering on the center hole 9e of the cam 9, while the first guide convex portion 12A is slid parallel to each other. A contact surface 12d is formed, and the sliding outer peripheral surface 9c is always in sliding contact with the sliding contact surface 12d. On the other hand, a member for supporting the cam 9 in the vertical direction is not provided, and the cam 9 is in direct contact with the lock tooth 10 while being movable in the vertical direction.

  A pair of arc-shaped compression springs 19 that urge the cam 9 to rotate counterclockwise in order to constantly urge the lock tooth 10 so that the external gear 10d of the lock tooth 10 meshes with the internal gear 7a. It is provided between the cam 9 and the lock tooth 10. Each compression spring 19 is mounted in a compressed state so that both ends 19 a and 19 b are separated from each other to bias the cam 9 and the lock tooth 10. One end 19a of each compression spring 19 is bent at a substantially right angle in the axial direction and hooked on a locking portion 9d formed at a diagonal position with respect to the shaft of the cam 9, and the other end 19b is approximately 1 in the circumferential direction. A lock formed in the vicinity of the second sliding outer peripheral surface 10b which is a position around the external gear 10d of one of the pair of lock teeth 10 and which is bent at a substantially right angle in the axial direction. It is hung on the hole 10e. For this reason, the upper compression spring 19 covers the lower pressing portion 9f of the cam and the upper locking tooth 10 that occupy diagonal positions, and the lower compression spring 19 lowers the upper pressing portion 9f of the cam and the lower portion. Cover the lock tooth 10 on the side.

  Thus, the pair of compression springs 19 are provided, and the pair of compression springs 19 are restricted in the axial direction between the pair of compression springs 19 in the axial direction and the lid body 7 as shown in FIGS. A ring-shaped pressing plate 23 is provided, and the pressing plate 23 is mounted on the inner surface of the lid 7 and on the outer peripheral side of the cylindrical portion 7b formed on the inner peripheral portion.

  As shown in FIGS. 2 and 3, the machine frame 5 and the lid body 7 are formed with anti-rotation convex portions 5 a and 7 c protruding from the end surfaces to the outer surface by embossing. The projections 5a and 7c for preventing rotation are formed on the cushion side arm 4 of FIG. 6 so that the fitting hole 4a is formed and the projection 5a is fitted into the fitting hole 4a. This is to firmly perform the coupling with the arm 4 and the coupling between the lid body 7 and the back side arm 6.

The vehicle seat reclining device 1 configured as described above is disposed on both sides of the seat cushion 2 in the width direction, and the shaft hole 9e of the cam 9 of the left and right vehicle seat reclining devices 1 is individually serrated. The operating shafts 15 (not shown) that are inserted through are connected via a connecting shaft (not shown). As shown in FIG. 6, an operation lever 20 is attached to the other end of one of the operation shafts 15, and an operation knob 21 is provided on the operation lever 20.
(Function)
Next, the operation of the vehicle seat reclining device 1 will be described.

  When the vehicle seat reclining device 1 is assembled to the seat, the cam 9 is rotated counterclockwise by the urging force of the compression spring 19, as shown in FIG. The one end 19a of the 19 biases the cam 9, and the biasing cam surface 9a indirectly biases the lock tooth 10 at the same time, and at the same time the other end 19b of the compression spring 19 directly biases the lock tooth 10. 10 is guided by the shaft portion 11 and the first and second guide convex portions 12A and 12B, and swings clockwise around the shaft portion 11 so that the external gear 10d meshes with the internal gear 7a of the lid body 7. Locked. That is, the rotation of the seat back 3 is restricted.

  Next, when the operation knob 21 of FIG. 6 is operated and the operation shaft 15 is rotated clockwise against the urging force of the compression spring 19, the engagement between the lock cam surface 9a of the cam 9 and the lock tooth 10 is released. At the same time, the unlocking cam surface 9b presses the lock tooth 10 in the opposite direction. For this reason, the lock tooth 10 swings counterclockwise about the shaft portion 11, the meshing of the external gear 10d and the internal gear 7a is released, the lock is released, and the back to which the lid 7 is attached. The side arm 6 and the seat back 3 are rotated forward by a biasing force of a spring (not shown). At this time, the force for operating the operation knob 21 is a value obtained by adding the urging force of the one end 19a of the compression spring 19 and the urging force of the other end 19b.

  When the seat back 3 is rotated backwardly against the urging force of a spring (not shown) and released from the operation knob 21 at the desired angular position of the seat back 3, the end 19a of the compression spring 19 is attached. Due to the force, the cam 9 rotates counterclockwise, and the lock cam surface 9a indirectly presses the lock tooth 10 clockwise about the shaft portion 11, and at the same time, the other end 19b of the compression spring 19 directly pushes the lock tooth 10 clockwise. Press on. For this reason, the external gear 10d of the lock tooth 10 meshes with the internal gear 7a to return to the locked state.

  According to the present invention, the urging force of the pair of compression springs 19 provided between the cam 9 and the lock tooth 10 acts on the diagonal positions of the cam 9, and therefore the urging force for rotating the cam 9. Only the force acts, and the urging force that moves the cam 9 in the radial direction does not act. Therefore, there is no possibility that the lock timing of the pair of lock teeth 10 aligned in the circumferential direction is shifted due to the cam 9 moving in the radial direction. Therefore, the feeling does not decrease when locking. Further, since the biasing force of the compression spring 19 is indirectly transmitted from the one end 19a to the lock tooth 10 via the cam 9, and directly transmitted to the lock tooth 10 from the other end 19b, the biasing force of the compression spring 19 is transmitted to the other end 19a and the other. It is transmitted to the lock tooth 10 from two directions with the end 19b, and the pressing force for pressing the external gear 10d of the lock tooth 10 against the internal gear 7a of the lid 7 is large and the meshing force is large.

  According to the present invention, since the pair of pressing portions 9f of the cam 9 and the pair of lock teeth 10 are covered by the pair of compression springs 19, the cam 9 and the pair of lock teeth 10 are restricted from moving in the axial direction. .

  According to the present invention, the pair of compression springs 19 are restricted in the axial direction by the pressing plate 23, and the cam 9 and the pair of lock teeth are restricted in the axial direction by the pair of compression springs 19. Further, a rotation-preventing convex portion 7 c that protrudes from the end surface of the lid body 7 to the outer surface is formed, and a concave portion 7 d is inevitably formed on the inner surface of the lid body 7. There is a risk that the end 19b that is bent in the axial direction may be caught. However, the presence of the pressing plate 23 prevents this catching and prevents the feeling from being lowered during locking.

  In this embodiment, the pressing plate is provided, but a configuration without the pressing plate may be employed.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a front view of a vehicle seat reclining device with a part broken away (embodiment). AA arrow line view of FIG. 1 (embodiment). BB arrow line view of FIG. 1 (embodiment). The perspective view (embodiment) of a compression spring. 1 is an exploded perspective view of a vehicle seat reclining device (embodiment). 1 is an external view of a sheet (embodiment).

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Seat reclining device 5 ... Machine frame (base member)
7: Lid (rotating member)
7a ... Internal gear 9 ... Cam 9d ... Locking portion 9f ... Pressing portion 10 ... Lock tooth 10d ... External gear 10e ... Locking hole 11 ... Shaft portion 11a ... Center side guide surface 12A ... First guide convex portion (guide portion) )
12B ... 2nd guide convex part (guide part)
12a ... 1st outer peripheral side guide surface (outer peripheral side guide surface)
12b ... 2nd outer peripheral side guide surface (outer peripheral side guide surface)
19 ... Compression spring (spring)
19a ... One end 19b ... The other end 23 ... Holding plate

Claims (3)

A base member coupled to one of a seat cushion and a seat back fixed to the seat cushion so as to be rotatable, and a base member coupled to the other and rotatable relative to the base member in the circumferential direction. And a rotating member having an internal gear on the inner peripheral surface and an external gear meshable with the internal gear, and swinging along the circular arc track in a direction in which the external gear engages / disengages with the internal gear. A pair of movable lock teeth, a pair of shafts formed integrally with the base member, and a pair of shafts formed integrally with the base member, and a guide surface on the outer periphery of the circular arc track, and There are two pairs of guide portions integrally formed on the base member in the vicinity of both ends, and pressing portions for pressing the respective lock teeth, and the external gear is engaged with the internal gear to be locked or unlocked. A cam or, a spring for biasing the cam in the locking direction, the cam is in the seat reclining apparatus for a vehicle is movably supported in the radial direction connecting the pressing portion to each other,
A pair of arc-shaped compression springs are provided between the cam and the lock tooth, and one end of each compression spring is hooked on the diagonal position of the cam, and the other end is made substantially one turn in the circumferential direction. A seat reclining device for a vehicle, wherein the seat reclining device is hooked in a locking hole formed at a position of the lock tooth on the external gear side. The vehicle seat reclining device according to claim 1,
One of the compression springs covers the pressing portion on the other side of the cam that occupies a diagonal position with respect to the axial center of the cam and the lock tooth on one side, and the other compression spring is the one on the one side of the cam. A seat reclining device for a vehicle, which covers a pressing portion and a lock tooth on the other side. The vehicle seat reclining device according to claim 1 or 2,
A pressing plate for restricting the pair of compression springs in the axial direction is provided between the pair of compression springs and the rotating member in the axial direction, and the pressing plate is attached to the rotating member. A vehicle seat reclining device.

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