JP2012091623A - Seat reclining device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To install a means for absorbing a shock in a recliner.SOLUTION: A machine frame 5 is connected to a cushion-side arm, a lid 7 which is turnable with respect to the machine frame 5 is arranged at a backside arm, an internal tooth rear 7a is formed at the inner peripheral surface of the lid 7, a lock suit 10 having an external tooth gear 10d engaged with the internal tooth gear 7a is arranged at the machine frame 5, an axial protrusion 11 for guiding the lock suit 10 to a direction in which the external tooth gear 10d and the internal tooth gear 7a are engaged with each other, a first guide 12A and a second guide 12B are formed at the machine frame 5, a holder 8 is arranged which regulates the machine frame 5 and the lid 7 in the radial direction and the axial direction, and the first guide 12A is constituted of an always-contacting guide 13 and a backup guide 14 which is arranged in the circumferential direction with respect to the always-contacting guide 13 via a gap 16 so that the lock suit 10 likely turning integrally with the lid 7 which has received a shock load is partially yielded and a deformation load is reduced in the first half of a process for pressing and compression-deforming the first guide 12A.

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 provide a seat reclining device provided with a means for absorbing an impact when it is collided from behind, inside the recliner.

In the invention according to claim 1, the base member is coupled to one of the cushion side arm constituting the seat cushion and the back side arm constituting the seat back, and the other is rotatable with respect to the base member. A rotating member having a cylindrical portion, an internal gear formed on an inner peripheral surface of the cylindrical portion, and a lock tooth having an external gear meshing with the internal gear provided on the base member, the external gear Forming a guide portion on the base member having a guide surface for guiding the lock tooth in a direction to be engaged with and disengaged from the internal gear, and restricting the base member and the rotating member in the radial direction and the axial direction. A holder,
When the back side arm tries to rotate relative to the cushion side arm, the lock tooth that tries to rotate integrally with the rotation member is one side of the lock tooth in the circumferential direction. The shape of the guide portion is set such that a part of the guide portion including the guide surface yields and deforms in the process of pressing the guide surface of the guide portion disposed in To do.

  According to the present invention, when a collision from the rear of the vehicle occurs, an impact force that causes the seat back to rotate rearward acts on the seat cushion, and the rotating member moves rearward relative to the base member. Try to rotate. For this reason, the lock tooth which tries to rotate integrally with the rotating member presses the guide portion of the base member. In the process of pressing the guide surface of the guide portion, a part of the guide portion including the guide surface yields. For this reason, when the seat back is slightly rotated backward and a part of the guide portion is deformed, the amount of energy absorbed in the seat reclining device is increased, and the amount of impact energy accumulated in the back side arm is decreased. For this reason, the reaction of the back side arm that occurs after the collision is reduced, and the impact applied to the occupant is reduced.

The invention according to claim 2 is the seat reclining device according to claim 1,
The guide part where the part yields is a regular guide part formed with a guide surface that is always in contact with the lock tooth, and a backup guide part arranged circumferentially with respect to the regular guide part via a gap. And
The size of the gap is set such that when the load caused by a collision from the rear acts on the regular guide portion from the lock tooth, the regular guide portion yields only once. .

  According to the present invention, when a collision is caused from the rear, an impact load is applied from the lock tooth to the regular guide portion, and the impact guide energy is absorbed by the yielding of the regular guide portion, and then the back of the regular guide portion. The lock tooth is supported by the backup guide portion located in the position. For this reason, the impact to the passenger | crew at the time of being collided from back is relieved.

  According to the seat reclining device according to claim 1, the portion for absorbing the impact is provided by setting the shape of the guide portion so that a part of the guide portion including the guide surface yields, so that the configuration for absorbing the impact is provided. Is simple, and it is only necessary to modify the existing parts without the need for a new component, so that the cost of the seat reclining device can be suppressed.

  According to the seat reclining device of the second aspect, since the guide portion is constituted by the permanent guide portion, the backup guide portion, and the gap between them, the yield load can be set only by increasing or decreasing the size of the gap. It is easy to change the yield load.

The front view of the seat reclining apparatus shown partially broken (embodiment). AA sectional view of FIG. 1 (embodiment). The disassembled perspective view of a seat reclining device (embodiment). The block diagram which shows the relationship between a sheet | seat and a seat reclining apparatus (embodiment). Action | operation explanatory drawing of sheet reclining apparatus (embodiment). The graph which shows the relationship between the displacement and torque of the conventional seat reclining apparatus (embodiment). The graph which shows the relationship between the displacement and torque of a seat reclining device concerning the present invention (embodiment).

Hereinafter, embodiments of a seat reclining device according to the present invention will be described.
(Constitution)
As shown in FIG. 4, 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 (fixing member) 5 is coupled to the seat cushion 2 via a cushion side arm 4, while a lid (rotating member) 7 is coupled to the seat back 3 via a back side arm 6. . A spring (not shown) that biases the seat back 3 toward the left side, which is the front of the vehicle, is provided with respect to the seat cushion 2.

  The machine frame 5 and the lid body 7 constitute a vehicle seat reclining device 1 shown in FIGS. The configuration of the vehicle seat reclining device 1 will be described below. As shown in FIG. 2, in the machine frame 5, the inside of the disk is half-cut by a press to form a cylindrical part 5b and a circular recessed part 5a, while the lid 7 has a flange-like outer peripheral part of the disk by forging. A cylindrical portion 7b and a circular concave portion 7c are formed by being bent at right angles to each other, and an internal gear 7a is formed on the inner peripheral surface of the cylindrical portion 7b. The cylindrical portion 7b of the lid body 7 is fitted inside the cylindrical portion 5b of the machine frame 5, and the lid body 7 is coaxially and relatively rotatably disposed in the circular recess 5a of the machine frame 5. The cylindrical portion 5b of the machine frame 5 is sandwiched by the base end portion of the ring-shaped holder 8, and the lid body 7 is restricted in the axial direction by the distal end portion, so that the machine frame 5 and the lid body 7 are in the radial direction and They are relatively restricted in the axial direction and are held so as to be relatively rotatable. A cam 9 is rotatably disposed in the center between the machine frame 5 and the lid body 7 in the axial direction, and a pair of lock teeth 10 are swingably disposed in the vertical position of FIG. Has been.

  In order to guide the lock tooth 10 in a swingable manner along the arcuate track, a substantially cylindrical shaft projection 11 is integrally formed with the machine frame 5 as a guide on the inner peripheral side of the arcuate track. On the other hand, a pair of first guide protrusions 12A and second guide protrusions 12B as guide parts are formed integrally with the machine frame 5 in correspondence with the number of lock teeth 10 on the outer peripheral side in the vicinity of both ends of the circular arc track. ing. An external gear 10d that engages with and disengages from 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.

  When a collision from behind occurs in the vehicle, a collision load that rotates the seat back acts, and the back side arm 6 tries to rotate backward relative to the cushion side arm 4. To do. At that time, the lock tooth 10 which is going to rotate integrally with the lid body 7 presses the first guide protrusion 12A to compress and deform it. For this reason, the process of the lock tooth 10 about to rotate integrally with the lid body 7 compresses and deforms the first guide protrusion 12A disposed on the clockwise side of the lock tooth 10 in the circumferential direction. In the first half, the shape of the first guide protrusion 12A is set so that a part of the first guide protrusion 12A yields and the deformation load decreases. The first guide protrusion 12 </ b> A, which partially yields, has a regular guide 13 formed with a guide surface 13 a that is always in contact with the lock tooth 10, and a gap 16 in the circumferential direction with respect to the regular guide 13. And a backup guide portion 14 disposed therebetween. The size G of the gap 16 is such that the normal guide portion 13 yields only once when a load due to a collision from the rear acts on the normal guide portion 13 from the lock tooth 10. Is set.

  The cam 9 is provided to press the lock tooth 10 having the external gear 10d as described above toward the internal gear 7a. The cam 9 rotates counterclockwise in FIG. 1 around the center hole 9e, thereby pressing the pair of lock teeth 10 outward in the radial direction to engage the external gear 10d with the internal gear 7a. Conversely, the meshing can be released by rotating clockwise.

  On the outer peripheral surface of the cam 9, there are a lock cam surface 9a for swinging the lock tooth 10 clockwise and meshing the external gear 10d with the internal gear 7a, and an external tooth by swinging the lock tooth 10 counterclockwise. An unlocking cam surface 9b for separating the gear 10d from the internal gear 7a is formed.

  In order to urge the cam 9 in the locking direction, a torsion coil spring 19 is arranged. That is, it is configured as follows. A spring housing space 21 is formed at a position where one set of the first guide protrusions 12A adjacent to each other in the circumferential direction and the other set of the second guide protrusions 12B are opposed to each other. A coil spring 19 is accommodated. One short end 19a of the torsion coil spring 19 is engaged with the second guide protrusion 12B to hold the torsion coil spring 19, and the other long end 19b is engaged with the spring hook 9d of the cam 9. The cam 9 is biased in the locking direction. In order to restrict the urging end 19b in the axial direction, as shown in FIG. 2, a ring plate-like regulating member 17 is fitted to a cylindrical portion 7e that protrudes from the inner surface of the lid body 7 in the axial direction.

  In order to turn the cam 9 in the unlocking direction against the urging force of the torsion coil spring 19, an operation shaft 15 shown in FIG. 4 is press-fitted and fixed in the center hole 9e of the cam 9. An operation lever 20 is attached to the shaft 15.

  As shown in FIGS. 2 to 4, the outer surface of the machine frame 5 has two circular anti-rotation projections 5 c that protrude outward in the axial direction and two elliptical anti-rotation projections 5 d that are long in the radial direction. The anti-rotation protrusions 5 c and 5 d are formed in the anti-rotation holes 4 a and 4 b formed in the cushion side arm 4. On the other hand, six circular anti-rotation protrusions 7f protruding outward in the axial direction are formed on the outer surface of the lid body 7 at substantially equal intervals along the circumference, and the anti-rotation protrusions 7f are formed on the back side arm 6. The non-illustrated non-rotating hole is fitted.

In addition, in order to set the recliner range of the rear inclination in which the seat back 3 is locked and the free range of the front inclination not locked in FIG. 4, the lock tooth 10 has a stopper 10 e that protrudes in the axial direction toward the lid body 7. In order to guide the stopper 10e in the circumferential direction while restricting the movement of the stopper 10e toward the outer peripheral side in the radial direction, a regulating guide portion 7d is provided on the outer peripheral portion of the inner surface of the lid body 7 as shown in FIGS. Is formed.
(Function)
Next, the operation of the vehicle seat reclining device 1 will be described.

  In the state in which the vehicle seat reclining device 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 lock cam surface 9 a, the lock tooth 10 is swung clockwise, and the external gear 10 d is in mesh with the internal gear 7 a of the lid 7. That is, the rotation of the seat back 3 is restricted.

  Next, when the operating lever 20 is operated and the operating shaft 15 is rotated in the clockwise direction in FIG. 4 against the urging force of the torsion coil spring 19, the engagement between the lock cam surface 9a of the cam 9 and the lock tooth 10 occurs. Is released, and 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 is disengaged from the internal gear 7 a, and is unlocked, and the lid 7 is attached. 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 biasing force of a spring (not shown) and released from the operation lever 20 at the desired angular position of the seat back 3, the biasing force of the torsion coil spring 19 causes The cam 9 rotates counterclockwise, and the lock cam surface 9 a presses the lock tooth 10. For this reason, the external gear 10d of the lock tooth 10 meshes with the internal gear 7a and returns to the locked state of FIG.

  According to the present invention, when a collision from behind occurs in the vehicle, an impact force that rotates the seat back 3 backward acts on the seat cushion 2, and the lid 7 is relative to the machine frame 5. Try to rotate backwards. For this reason, the lock tooth 10 which tries to rotate integrally with the lid body 7 is received by the shaft portion 11 of the machine casing 5 and the first guide portion 12A. In the first half of the process of compressing the first guide portion 12A, the strength of the regular guide portion 13 is set to be small due to the presence of the gap 16, so that the regular guide portion 13 cannot receive the lock tooth 10 and yield. Then, as shown in FIG. 5, the regular guide portion 13 is deformed and moved in the circumferential direction by the gap 16, and the shaft projection portion 11 is also deformed as indicated by the mesh line. As a result, the seat back 3 rotates slightly backward until the gap 16 disappears, and the amount of deformation increases, but the amount of shock energy absorbed by the seat reclining device increases and is accumulated in the back side arm 6. The amount of impact energy is reduced. For this reason, the reaction of the back side arm that occurs after the collision is reduced, and the impact applied to the occupant is mitigated.

  According to the present invention, when the vehicle is collided from the rear, an impact load is applied from the lock tooth 10 to the regular guide portion 13, and the regular guide portion 13 yields to absorb the impact energy. The lock tooth 10 is supported by the backup guide portion 14 located behind the contact guide portion 13. For this reason, the impact to the passenger | crew at the time of being collided from back is relieved.

  FIG. 6 shows the relationship between torque and displacement of a conventional seat reclining device as the seat reclining device and the seat reclining device of the present application in which the first guide portion 12A is divided into the regular guide portion 13 and the backup guide portion 14. 7 shows. 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 progresses, and when the recliner is finally broken, the torque rapidly decreases. On the other hand, in the seat reclining device of the present application, when the torque increases, the normal guide portion 13 yields and the normal guide portion 13 moves by the gap 16, so that the lid 7 is relative to the machine frame 5. As shown in FIG. 7, the torque decreases slightly and the displacement increases. Thereafter, the torque increases in a curve similar to that shown in FIG. 6, 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. Thereby, the energy absorption amount by a seat reclining apparatus can be increased, without reducing the intensity | strength as a seat reclining apparatus.

  According to this seat reclining device, since the gap 16 for absorbing shock is provided by setting the shape of the first guide portion 12A so that a part of the first guide portion 12A including the guide surface 13a yields, the shock is absorbed. Therefore, the cost of the seat reclining device can be prevented from being increased because only a modification of an existing part is required without requiring a new component member.

  According to this seat reclining device, since the first guide portion 12A is constituted by the permanent guide portion 13, the backup guide portion 14, and the gap 16 between them, the yield load is set only by increasing or decreasing the dimension G of the gap 16. The yield load can be changed easily.

  In the present embodiment, the machine casing 5 is coupled to the cushion side arm 4, while the lid body 7 is coupled to the back side arm 6. However, the attachment may be reversed. In addition, this embodiment shows a case in which the circular arc trajectory is provided so that the lock tooth moves along the arc, but the linear trajectory is provided so that the lock tooth moves along the straight line in the radial direction. Also good. Furthermore, 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 may be arranged at equal intervals or unequal intervals in the circumferential direction. .

2 ... Seat cushion 3 ... Seat back 4 ... Cushion side arm 5 ... Machine frame (base member)
6 ... Back side arm 7 ... Lid (rotating member)
7a ... Internal gear 7b ... Cylindrical part 8 ... Holder 10 ... Lock tooth 10d ... External gear 12a ... Guide part 13 ... Regular guide part (part of guide part)
13a ... Guide surface 14 ... Backup guide part 16 ... Clearance

Claims (2)

A base member is coupled to one of the cushion side arm constituting the seat cushion and the back side arm constituting the seat back, and the other is a pivot having a cylindrical portion that is rotatable with respect to the base member. A member is provided, an internal gear is formed on the inner peripheral surface of the cylindrical portion, a lock tooth having an external gear meshing with the internal gear is provided on the base member, and the external gear is engaged with and disengaged from the internal gear. A guide part having a guide surface for guiding the lock tooth in a direction to be formed is formed on the base member, and a holder for restricting the base member and the rotating member in a radial direction and an axial direction is provided,
When the back side arm tries to rotate relative to the cushion side arm, the lock tooth that tries to rotate integrally with the rotation member is one side of the lock tooth in the circumferential direction. The shape of the guide portion is set such that a part of the guide portion including the guide surface yields and deforms in the process of pressing the guide surface of the guide portion disposed in Seat reclining device. The seat reclining device according to claim 1,
The guide part where the part yields is a regular guide part formed with a guide surface that is always in contact with the lock tooth, and a backup guide part arranged circumferentially with respect to the regular guide part via a gap. And
The size of the gap is set such that when the load caused by a collision from the rear acts on the regular guide portion from the lock tooth, the regular guide portion yields only once. Seat reclining device.

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