JP2012091622A - Seat reclining device - Google Patents

Abstract

An impact absorbing means for a collision from the rear is provided outside the recliner.
A mounting plate is coupled to a cushion side arm, a recliner is coupled to a back side arm, an energy absorbing plate is disposed between the recliner and the mounting plate, and the machine frame is mounted. While providing the 1st projection part 5c which protrudes toward the energy absorption plate 22, the 2nd projection part 21a which protrudes toward the energy absorption plate 22 is provided in the attachment plate 21, and this 1st projection part 5c and 2nd projection part The first fitting portion 22a and the second fitting portion 22b to which 21a is fitted are formed on the center side and the outer peripheral side in the radial direction of the energy absorbing plate 22, and the two fitting portions 22b are arranged along the circumferential direction. Thus, an outer peripheral side taper inner wall that gradually decreases in radius dimension and an inner peripheral side taper inner wall that increases sequentially are formed, and the machine frame, the lid body 7, the energy absorbing plate 22, and the mounting plate 21 are formed. The holder ring 23 for holding the provided.
[Selection] Figure 1

Description

  The present invention relates to a seat reclining device in which shock absorption is performed for a collision from the rear of a vehicle.

  A seat is provided in the vehicle, and a seat reclining device is provided so that the inclination of the seat back with respect to the seat cushion can be locked at an arbitrary angle. When the vehicle collides from behind, the vehicle body moves forward, so that the occupant falls back relative to the vehicle body, and the occupant is pressed against the seat back. At this time, if the amount of elastic deformation of the back side arm constituting the seat back is large, the reaction load when the back side arm is restored because the collision load is lost increases, and there is a problem that this large reaction acts on the occupant. .

  For this reason, Patent Documents 1 and 2 propose to provide an impact absorbing structure that gradually increases the inclination of the seat back with respect to the seat cushion while absorbing the impact when the vehicle collides from the rear. ing.

  In Patent Document 1, a rear impact shock absorbing unit is provided between a seat cushion side member and a seat back side member, and the rear impact impact absorbing unit is configured by one side member and the other side member. A convex portion is provided on the other side member, and a concave portion into which the convex portion is fitted is provided on the other side member. When a rear impact is applied, the concave portion is deformed while the convex portion is fitted in the concave portion, and the energy of the rear impact is absorbed. It is made to be done.

  In Patent Document 2, a seat fixing frame that is a frame of a seat cushion is provided with a connection fixing hole plate that can be moved backward via an impact absorbing connection portion, and the frame of the seat back is rotatable on the connection fixing hole plate. A back frame is provided, and the shock absorbing connecting portion is formed by forming a shock absorbing long hole in the seat frame, while providing a shock absorbing pin in the connection fixing hole plate, and an outer diameter of the shock absorbing pin. Is set to be larger than the width dimension of the shock absorbing long hole, and when a rear impact occurs, the shock absorbing pin moves backward while widening the shock absorbing long hole, thereby absorbing the shock.

JP 2009-1209 A JP 2009-46031 A

  However, the seat reclining device described in Patent Document 1 has a large rear impact shock absorption unit itself, and therefore can be adopted unless the seat back is sufficiently thick so that the rear impact impact absorption unit can be accommodated in the seat back. In addition, the number of parts is large and the manufacturing cost is high.

  On the other hand, the seat reclining device described in Patent Document 2 includes a shock absorbing connecting portion including a shock absorbing long hole and a shock absorbing pin between the seat frame and the connecting fixing hole plate, and the support rigidity of the back frame. Decreases. In addition, since the shock absorbing characteristics change depending on the tightening torque of the shock absorbing pin, there is a problem that it is difficult to manage the shock absorbing load.

  SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to solve the above-described problems and to provide a seat reclining device provided with means for absorbing an impact when it is collided from behind, outside the recliner.

According to a first aspect of the present invention, there is provided a base member, a rotating member that is rotatable relative to the base member, a holder ring that restricts axial movement of the rotating member relative to the base member, and the base member A recliner is provided with locking means for locking or unlocking the rotation of the rotation member with respect to
Either the base member or the rotating member is coupled to one of a cushion side arm provided on the seat cushion side and a back side arm provided on the seat back side, and a mounting plate is provided on the other side. Combine and
An energy absorbing plate is disposed between the other of the base member and the rotating member and the mounting plate,
By the holder ring, the base member, the rotating member, and the mounting plate are axially restricted so as to be relatively rotatable,
The energy absorbing plate connects the other of the base member and the rotating member and the mounting plate in a rotation direction so as not to rotate relative to each other, and when an impact acts on the seat back, the base member and the The impact energy is absorbed when the energy absorbing plate is deformed by relative rotation between the other of the rotating members and the mounting plate.

  According to the present invention, when a collision from the rear of the vehicle occurs, an impact force that rotates the seat back backward acts on the seat cushion, and a force that rotates the recliner backward against the mounting plate. Works. For this reason, relative rotation occurs between the members between the mounting plate and the energy absorbing plate, between the recliner and the energy absorbing plate, or both, and the energy absorbing plate is deformed while rotating. . For this reason, the seat back slightly rotates backward, the impact applied to the occupant from the seat back is absorbed, and the impact on the occupant is mitigated.

The invention according to claim 2 is the seat reclining device according to claim 1,
The first protrusion that protrudes toward the energy absorbing plate is provided on the other of the base member and the rotating member, while the second protrusion that protrudes toward the energy absorbing plate is provided on the mounting plate. Forming a first fitting portion and a second fitting portion into which the first protrusion portion and the second protrusion portion are fitted on the center side and the outer peripheral side in the radial direction of the energy absorbing plate;
At least one of the first fitting part and the second fitting part is formed with a deforming part that rotates and deforms relative to the first projecting part or the second projecting part. .

  According to this invention, when a collision from the rear of the vehicle occurs, at least one of the first protrusion and the second protrusion is inside the first fitting part or the second fitting part of the energy absorbing plate. At this time, the deformed portion formed in at least one of the first fitting portion and the second fitting portion is deformed, whereby the other of the base member and the rotating member and the mounting plate are Rotate relatively. For this reason, the seat back slightly rotates backward, the impact applied to the occupant from the seat back is absorbed, and the impact on the occupant is mitigated.

The invention according to claim 3 is the seat reclining device according to claim 2,
As the first fitting portion and the second fitting portion having the deforming portion, an arcuate fitting portion is formed along a locus drawn when the first and second projecting portions rotate, and the arcuate fitting is performed. At least one of the outer peripheral taper inner wall whose radial dimension is successively decreased along the circumferential direction and the inner peripheral taper inner wall whose radial dimension is sequentially increased along the circumferential direction on the arc-shaped inner wall of the joint portion One of them is formed.

  According to the present invention, when a collision from the rear of the vehicle occurs, at least one of the first projecting portion and the second projecting portion is the outer peripheral tapered inner wall and the inner peripheral tapered inner wall of the arcuate fitting portion. By deforming at least one of these, the other of the base member and the rotating member and the mounting plate rotate relatively. For this reason, the seat back slightly rotates backward, the impact applied to the occupant from the seat back is absorbed, and the impact on the occupant is mitigated.

  According to the seat reclining device according to the first aspect, the mounting plate and the energy absorbing plate are restrained and held in the radial direction and the axial direction by the holder ring together with the recliner, so that the support rigidity is strong and the size is not increased. Further, since the energy absorbing plate and the mounting plate are simply provided on the recliner which is the original seat reclining device, the assembling property is also good.

  According to the seat reclining device according to claim 2, at least one of the first fitting portion and the second fitting portion is provided with a deforming portion that is deformed by relative rotation with the first protruding portion or the second protruding portion. Since it is formed, it is not necessary to provide the shock absorbing connection part separately from the rotating part as in the conventional patent document 2.

  According to the seat reclining device according to claim 3, as the deforming portion, the outer peripheral side taper inner wall whose radial dimension sequentially decreases along the circumferential direction on the arc-shaped inner wall of the arc-shaped fitting portion, and the circumferential direction Since at least one of the inner circumferential side taper inner wall whose radial dimension increases sequentially along the inner diameter of the first projection, the size of the load received from the first projection and the second projection when absorbing energy, and the first projection When the movement amount of the second protrusion is set, it is only necessary to change the shape of the arcuate fitting portion of the energy absorbing plate, and the setting is easy.

1 is a perspective view showing an overall configuration of a seat reclining device (Embodiment 1). FIG. Explanatory drawing which shows the relationship between an attachment plate and an energy absorption plate (Embodiment 1). FIG. 3 is a front view showing the recliner with a part broken away (Embodiment 1); Sectional drawing of a recliner (Embodiment 1). The block diagram which shows the relationship between a sheet | seat and a seat reclining apparatus (Embodiment 1). The graph which shows the relationship between the displacement and torque of the conventional seat reclining apparatus (Embodiment 1). The graph which shows the relationship between the displacement and torque of the seat reclining device which concerns on this invention (Embodiment 1). Explanatory drawing which shows the relationship between an attachment plate and an energy absorption plate (Embodiment 2).

  Hereinafter, embodiments of a seat reclining device according to the present invention will be described.

(A) Embodiment 1
First, the first embodiment will be described.
(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 the seat cushion 2 so as to be rotatable in the front-rear direction of the vehicle. A cushion side arm 4 is coupled to a frame (not shown) on the seat cushion 2 side, while a back side arm 6 is coupled to a frame (not shown) on the seat back 3 side. A seat reclining device is provided between the cushion side arm 4 and the back side arm 6. A spring (not shown) that biases the seat back 3 toward the left side that is the front of the vehicle with respect to the seat cushion 2 is provided.

  As shown in FIG. 1, the seat reclining device includes a recliner 1, a mounting plate 21, and an energy absorbing plate 22 disposed between a cushion side arm 4 and a back side arm 6. As shown in FIGS. 3 and 4, the recliner 1 includes a machine casing 5 as a base member, a lid body 7 as a rotating member that is rotatable relative to the machine casing 5, and a lid body for the machine casing 5. 7 is configured by a holder ring 23 for restricting the movement of the cover 7 in the axial direction, and locking means provided on the machine frame 5 for locking or unlocking the rotation of the lid body 7. The configuration of the recliner 1 will be described later.

  As shown in FIG. 1, the mounting plate 21 is coupled to the cushion side arm 4, and the lid 7 portion of the recliner 1 is coupled to the back side arm 6. An energy absorbing plate 22 is disposed between the machine frame 5 (located inside the holder ring 23) of the recliner 1 and the mounting plate 21.

  Both the machine casing 5 and the mounting plate 21 are connected to different positions in the radial direction of the energy absorbing plate 22. That is, it is configured as follows. A columnar first protrusion 5 c that protrudes toward the energy absorbing plate 22 is provided on the machine frame 5. On the other hand, the mounting plate 21 is provided with a cylindrical second protrusion 21 a that protrudes toward the energy absorbing plate 22. Six first protrusions 5 c are formed at substantially equal intervals along the circumferential direction on the center side in the radial direction of the machine casing 5, and the second protrusions 21 a are circular on the outer peripheral side in the radial direction of the mounting plate 21. Six are formed at substantially equal intervals along the circumferential direction. And the 1st fitting part 22a and the 2nd fitting part 22b which the 1st projection part 5c and the 2nd projection part 21a fit are 6 in the center side and the outer peripheral side of the radial direction of the said energy absorption plate 22, respectively. It is formed one by one.

  The latter of the first fitting portion 22a and the second fitting portion 22b is formed with a deforming portion that is rotated and deformed relative to the second protruding portion 21a. That is, as shown in FIG. 2, a short arc-shaped fitting portion is formed along a locus drawn when the second protrusion 21a rotates, and the circumferential inner wall of the arc-shaped fitting portion is formed in the circumferential direction. An outer peripheral taper inner wall 22c whose radial dimension decreases sequentially along the clockwise direction and an inner peripheral taper inner wall 22d whose radial dimension increases sequentially along the clockwise direction are formed.

  The recliner 1 shown in FIGS. 3 and 4 is constituted by the machine casing 5, the lid 7 and the locking means. The configuration of the recliner 1 will be briefly described below. As shown in FIG. 4, a circular recess 5a is formed in the machine frame 5 by forming a cylindrical portion 5b, while a circular recess 7c is formed in the lid 7 by forming a cylindrical portion 7b. An internal gear 7a is formed on the inner peripheral surface of the cylindrical portion 7b. The cylindrical portion 7b of the lid 7 is fitted into the cylindrical portion 5b of the machine casing 5 so as to be relatively rotatable. In the center between the machine frame 5 and the lid body 7 in the axial direction, a cam 9 is rotatably arranged, and a pair as the locking means is swingable in the vertical position of FIG. The lock tooth 10 is arranged.

  A shaft projection 11 is integrally formed with the machine frame 5 on the inner peripheral side of the arcuate track for guiding the lock tooth 10 to be swingable along the arcuate track. On the other hand, a pair of first guide protrusions 12 </ b> A and second guide protrusions 12 </ b> B are integrally formed with the machine frame 5 on the outer peripheral side in the vicinity of both ends of the circular arc track. An external gear 10d is formed on the surface of the lock tooth 10 that swings along the arcuate track and faces the internal gear 7a.

  The cam 9 is provided to press the lock tooth 10 toward the internal gear 7a. The cam 9 rotates counterclockwise in FIG. 3 about the center hole 9e, thereby pressing the pair of lock teeth 10 radially outward to engage the external gear 10d with the internal gear 7a. 9a and a lock release cam surface 9b for releasing the meshing by turning clockwise.

  In order to urge the cam 9 in the locking direction, a lock spring 19 is provided via a semi-cylindrical convex portion 14 formed integrally with the machine frame 5. The outer end of the lock spring 19 is hung on a spring hook 9c formed on the cam 9. In order to rotate the cam 9 in the unlocking direction against the urging force of the lock spring 19, an operation shaft 15 is press-fitted and fixed in the center hole 9e of the cam 9, and the operation is performed as shown in FIG. An operation lever 20 is attached to the shaft 15.

  As shown in FIG. 4, a cylindrical portion 21b is formed on the outer peripheral portion of the mounting plate 21, and the energy absorbing plate 22 and an outer peripheral portion in the vicinity of the cylindrical portion 5b of the machine frame 5 are formed inside the cylindrical portion 21b. The machine frame 5, the lid body 7, the energy absorbing plate 22, and the mounting plate 21 are regulated in a radial direction and an axial direction by a holder ring 23, and the respective members are relatively rotatable. . The holder ring 23 has a substantially cylindrical shape, and a shaft between the cylindrical portion 21b and the cylindrical portion 5b is formed by a first flange portion 23a formed at the base end portion thereof and a second flange portion 23b formed near the distal end portion thereof. The position in the direction is restricted, and the position in the axial direction of the cylindrical part 7b relative to the machine frame 5 is restricted by the first flange part 23a and the third flange part 23c formed at the tip part.

Six anti-rotation protrusions 7e are formed on the outer surface of the lid 7 in the axial direction, and the anti-rotation protrusions 7e are formed in the six anti-rotation holes 6a formed in the back side arm 6 as shown in FIG. It is fitted and welded. Further, six anti-rotation projections 21c are formed on the outer surface in the axial direction of the mounting plate 21 on the radial center side of the second projection 21a, and the six anti-rotation projections 21c are formed on the cushion side arm 4. Are fitted and welded to the six anti-rotation holes 4a.
(Function)
Next, the operation of the seat reclining device will be described.

  First, the operation of the recliner 1 will be described. Normally, as shown in FIG. 3, the cam 9 is rotated counterclockwise by the urging force of the lock spring 19, and the lock tooth 10 is pressed by the lock cam surface 9a, and the lock tooth 10 is swung clockwise. The external gear 10d is in mesh with the internal gear 7a of the lid 7. That is, the rotation of the seat back 3 is restricted.

  Next, when the operation lever 20 is operated and the operation shaft 15 is rotated clockwise in FIG. 3 against the urging force of the lock spring 19, the engagement between the lock cam surface 9a of the cam 9 and the lock tooth 10 is performed. At the same time, the unlocking cam surface 9b presses the lock tooth 10 counterclockwise. For this reason, the lock tooth 10 swings counterclockwise about the shaft protrusion 11, the external gear 10 d and the internal gear 7 a are disengaged, and the lock tooth 10 is unlocked and attached to the lid body 7. The back side arm 6 and the seat back 3 are rotated in the forward direction by a biasing force of a spring (not shown).

  When the seat back 3 is rotated backwardly against the urging force of a spring (not shown) and released from the operation lever 20 at the desired angular position of the seat back 3, the cam is urged by the urging force of the lock spring 19. 9 rotates counterclockwise, and the lock cam surface 9 a presses the lock tooth 10. Therefore, the external gear 10d of the lock tooth 10 meshes with the internal gear 7a and returns to the locked state shown in FIG.

  Next, the operation of the portion that performs shock absorption will be described.

  According to the present invention, when a collision from the rear of the vehicle occurs, an impact force that rotates the seat back 3 backward acts on the seat cushion 2, and the recliner 1 rotates rearward with respect to the mounting plate 21. A moving force is applied. For this reason, relative rotation occurs between the mounting plate 21 and the energy absorbing plate 22, and the energy absorbing plate 22 is deformed while rotating. Specifically, the second protrusion 21a in FIG. 2 moves relatively in the circumferential direction inside the second fitting portion 22b of the energy absorbing plate 22, and at this time, formed in the second fitting portion 22b. The energy absorbing plate 22 rotates relative to the mounting plate 21 by the deformation of the outer tapered inner wall 22c and the inner tapered inner wall 22d. For this reason, the back side arm 6 and the seat back 3 are slightly rotated rearward, the impact applied to the occupant from the seat back 3 is absorbed, and the impact on the occupant is mitigated.

  FIG. 6 and FIG. 7 show the relationship between torque and displacement for a conventional seat reclining device constituted only by a recliner as a seat reclining device and a seat reclining device having the impact absorbing means of the present application. As shown in FIG. 6, in the prior art, displacement occurs approximately in proportion to the torque, and when the load exceeds a certain value, only the deformation proceeds to yield, and when the recliner is eventually broken, the torque decreases rapidly. . On the other hand, in the seat reclining device of the present application, when the torque increases, the second protrusion 21a moves in the circumferential direction inside the second fitting portion 22b, and the outer peripheral side taper inner wall 22c and the inner peripheral side taper inner wall 22d Therefore, the energy absorbing plate 22 rotates relative to the mounting plate 21, the torque becomes slightly smaller and the displacement becomes larger as shown in FIG. 7, and thereafter the same curve as in FIG. 6 is drawn. Torque increases and eventually the recliner breaks. In FIG. 7, the portion surrounded by the alternate long and short dash line indicates that the displacement has increased due to shock absorption.

  According to this seat reclining device, the mounting plate 21 and the energy absorbing plate 22 are regulated and held in the radial direction and the axial direction together with the recliner 1 by the holder ring 23, so that the support rigidity is strong and the size is not increased. Further, since the energy absorbing plate 22 and the mounting plate 21 are simply provided on the recliner 1 which is an original seat reclining device, the assembling property is also good.

  According to this seat reclining device, since the deforming portion that is deformed by the relative rotation with the second projecting portion 21a is formed in the second fitting portion 22b, the impact is separated from the rotating portion as in the conventional patent document 2. There is no need to provide an absorption connection.

  According to this seat reclining device, the outer peripheral side taper inner wall 22c whose radial dimension is successively reduced along the circumferential direction, and the circumferential direction along the arc-shaped inner wall of the arc-shaped fitting portion as the deforming portion. Since the inner circumferential side taper inner wall 22d whose radius dimension increases sequentially is formed, when setting the magnitude of the load received from the second protrusion 21a and the amount of movement of the second protrusion 21a during energy absorption, the energy It is only necessary to change the shape of the arcuate fitting portion of the absorption plate 22, and the setting is easy.

(B) Embodiment 2
Next, a second embodiment will be described.

  Since the second embodiment is obtained by changing a part of the first embodiment, the same parts are denoted by the same reference numerals, the description thereof is omitted, and only different parts are described.

  As shown in FIG. 8 corresponding to FIG. 2, only the shape of the second fitting portion 22b formed on the energy absorbing plate 22 is different from that of the first embodiment. Unlike the long hole, the second fitting portion 22b is a notch. For this reason, the outer peripheral side taper inner wall 22c is not formed, and only the inner peripheral side taper inner wall 22d is formed.

  In the first embodiment, the tapered inner walls are provided on both sides of the outer peripheral side and the inner peripheral side, whereas in the second embodiment, since the inner wall is formed only on the inner peripheral side, the buffering action is greater than that of the first embodiment. Will also be soft.

  In this embodiment, the recliner 1 is coupled to the back side arm 6 and the attachment plate 21 is coupled to the cushion side arm 4. Further, in this embodiment, the first protrusion 5c is formed on the center side in the radial direction, and the second protrusion 21a is formed on the outer peripheral side in the radial direction. Furthermore, a deformed portion that is deformed by rotating relative to the second projecting portion 22b is formed only on the second fitting portion 22b, but a deformed portion is formed only on the first fitting portion 22a or formed on both sides. May be. Furthermore, the arc-shaped inner wall of the arc-shaped fitting portion shows both the case where both the outer peripheral side taper inner wall and the inner peripheral side taper inner wall are formed, and the case where only the inner peripheral side taper inner wall is formed. Only the tapered inner wall may be formed.

  In this embodiment, the recliner 1 includes stepped locking means that can change the angle of the seat back by one tooth by engaging and disengaging the external gear of the lock tooth 10 with the internal gear of the lid 7. Even if it has a continuously meshing stepless locking means that can change the angle of the seat back steplessly by arranging a planetary gear between the lid 7 and the machine frame 5 It can be applied as it is.

DESCRIPTION OF SYMBOLS 1 ... Recliner 2 ... Seat cushion 3 ... Seat back 4 ... Cushion side arm 5 ... Machine frame (base member)
5c ... 1st projection part 6 ... Back side arm 7 ... Cover (rotating member)
10 ... Rock tooth (locking means)
DESCRIPTION OF SYMBOLS 21 ... Mounting plate 21a ... 2nd projection part 22 ... Energy absorption plate 22a ... 1st fitting part 22b ... 2nd fitting part 22c ... Outer peripheral side taper inner wall (deformation part)
22d ... Inner peripheral side taper inner wall (deformation part)
23 ... Holder ring

Claims (3)

A base member; a pivot member that is pivotable relative to the base member; a holder ring that restricts axial movement of the pivot member relative to the base member; and the pivot member relative to the base member. The recliner is configured by providing locking means for locking or unlocking the rotation,
Either the base member or the rotating member is coupled to one of a cushion side arm provided on the seat cushion side and a back side arm provided on the seat back side, and a mounting plate is provided on the other side. Combine and
An energy absorbing plate is disposed between the other of the base member and the rotating member and the mounting plate,
By the holder ring, the base member, the rotating member, and the mounting plate are axially restricted so as to be relatively rotatable,
The energy absorbing plate connects the other of the base member and the rotating member and the mounting plate in a rotation direction so as not to rotate relative to each other, and when an impact acts on the seat back, the base member and the A seat reclining device, wherein impact energy is absorbed by relative rotation between the other of the rotating member and the mounting plate, and the energy absorbing plate is deformed. The seat reclining device according to claim 1,
The first protrusion that protrudes toward the energy absorbing plate is provided on the other of the base member and the rotating member, while the second protrusion that protrudes toward the energy absorbing plate is provided on the mounting plate. Forming a first fitting portion and a second fitting portion into which the first protrusion portion and the second protrusion portion are fitted on the center side and the outer peripheral side in the radial direction of the energy absorbing plate;
At least one of the first fitting part and the second fitting part is formed with a deforming part that rotates and deforms relative to the first projecting part or the second projecting part. Seat reclining device. The seat reclining device according to claim 2,
As the first fitting portion and the second fitting portion having the deforming portion, an arcuate fitting portion is formed along a locus drawn when the first and second projecting portions rotate, and the arcuate fitting is performed. At least one of the outer peripheral taper inner wall whose radial dimension is successively decreased along the circumferential direction and the inner peripheral taper inner wall whose radial dimension is sequentially increased along the circumferential direction on the arc-shaped inner wall of the joint portion A seat reclining device characterized in that either one is formed.

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