JP2008272130A - Seat reclining device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a seat reclining device having an improved safety by sufficiently reducing a speed when forward tilting a seat back in particular. <P>SOLUTION: This device for adjusting a turning angle of the seat back 2 relative to a seat cushion 1 (not shown) has: a spiral main spring 5 for energizing the seat back 2 forward; and a coil-like inverse-energization spring 6 accumulating an energizing force for energizing the seat back backward and being prevented by a stopper 8 from transmitting the energizing force to the seat back 2 within an angle range from a neutral position toward the back of the seat back, and transmitting at least the accumulated energizing force to the seat back 2 within the angle range from the neutral position toward the front; wherein the coil-like inverse-energization spring 6 is disposed in the lower part of the main spring 5 and its overhanging in the seat lateral direction is suppressed. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a seat reclining device, and more particularly to a seat reclining device applied to a seat back of a vehicle.

  In Patent Document 1, in order to approximate the torque generated by the spring to the necessary torque for raising the seat back that has fallen backward, the seat back is raised in the forward direction. A seat reclining device having a main spring that generates a biasing force and a forward correction spring that generates a biasing force in the same direction as the main spring has been proposed.

  In Patent Document 2, the seat back is quickly rotated from the backward tilt position to the neutral position, and the seat back is slowly rotated from the neutral position to the forward tilt position. Therefore, the seat back is always directed toward the forward tilt position. A spiral main spring that biases to rotate, and a spiral reverse bias spring that biases the seat back to rotate toward the successor position only between the neutral position and the forward tilt position. A reclining device having been proposed.

  FIG. 9 is a torque diagram of the reclining device according to Patent Document 2, that is, a torque diagram showing a torque generated by the apparatus with respect to a seatback tilt angle θ. Referring to FIG. 9, when the seatback is tilted forward and the reverse biasing spring starts to operate (θ = 0), the torque line is simply bent, and the torque generated by the device on the plus side and the minus side of θ = 0. The amount of change is small.

  Patent Document 3 discloses that in a seat reclining device having a spiral spring that generates a biasing force in a direction in which the seat back rises forward (forward direction), when the seat back rotates forward from a vertical position, There has been proposed a seat reclining device that prevents a forward biasing force from being transmitted to the seat back.

Japanese Utility Model Publication No. 6-7548 Japanese Utility Model Publication No. 6-70642 JP 2002-101997 A

  However, the seat reclining device of Patent Document 1 does not have a function of urging backward to raise a seat that has fallen forward.

  As shown in FIG. 9, the reclining device of Patent Document 2 is in the neutral position as shown in FIG. 9 even when the reverse biasing spring is actuated in the neutral position when the seatback passes through the neutral position from the rear and falls forward. Since the amount of change in torque generated by the device on the plus side and the minus side is small, the rotational speed of the seat back does not decrease significantly.

  In the seat reclining device of Patent Document 3, when the seat back is tilted forward from the vertical position, the urging force of the spiral spring does not act on the seat back, but the seat back is tilted by its own weight, so the speed at which the seat back tilts is still high Get higher.

  An object of the present invention is to provide a seat reclining device that can sufficiently reduce the speed at which the seat back particularly falls forward and has improved safety. Another object of the present invention is to provide a seat reclining device capable of sufficiently reducing the speed when the seat back particularly leans forward with a compact structure, and having improved safety.

  In a first aspect, the present invention provides a seat reclining device for adjusting a rotation angle of a seat back with respect to a seat cushion, the main urging mechanism for urging the seat back in a predetermined direction, and the seat back Outside the predetermined angle range, the urging force accumulated for urging the seat back in the direction opposite to the predetermined direction cannot be transmitted to the seat back, and at least within the predetermined range, the accumulated force is not accumulated. And a reverse urging mechanism for transmitting the urging force to the seat back.

  According to a second aspect of the present invention, there is provided a seat reclining device for adjusting a rotation angle of a seat back with respect to a seat cushion, the main spring mechanism for biasing the seat back in a predetermined direction, An urging force for urging the seat back in a direction opposite to the predetermined direction is accumulated outside a predetermined angle range, and at least the accumulated urging force is accumulated in the seat back within the predetermined angle range. And a reverse urging mechanism for transmitting to the seat reclining device.

  In a third aspect, the present invention is a reclining device for adjusting a rotation angle of a seat back with respect to a seat cushion, which is disposed on a side surface of the seat back and between the seat cushion and the seat back. A spiral main spring that is directly or indirectly connected and biases the seat back in a predetermined direction, and is disposed on a side surface of the seat cushion and positioned below the main spring, and the seat cushion and the seat back And a biasing force for urging the seat back in a direction opposite to the predetermined direction outside the predetermined angle range of the seat back is accumulated, and the predetermined angular range is A coiled reverse biasing spring that applies at least the accumulated biasing force to the seat back. That provides a seat reclining apparatus characterized by.

  In a fourth aspect, the present invention provides a reclining device for adjusting a rotation angle of a seat back with respect to a seat cushion, wherein the rotation angle of the seat back is an X axis, and the reclining device is attached to the seat back. The acting torque is the Y axis, and the rotation angle of the seat back is positive on the rear side, the negative side on the front side, and the torque for biasing the seat back to the front side is biased on the positive side. In the torque diagram in which a torque line indicating the change of the torque with respect to the rotation angle is drawn with the torque as a negative side, the torque line on the front side of the predetermined angle of the seat back is the torque on the rear side. A seat reclining device is provided, which is located below the line along the Y axis and has a step at the predetermined angle between the two lines. To.

  According to the present invention, when the seatback tilts forward in a predetermined direction, for example, from the rear to the front, the torque generated by the reverse biasing mechanism or the reverse biasing spring, that is, the seatback in the opposite direction, that is, the front Since the rise of the reverse biasing torque that biases backward from the rear is large, the speed at which the seat back tilts can be greatly reduced from the moment when the seat back starts to tilt forward, and the safety of the seat reclining device is improved. The According to the present invention, the neutral position, which is the point at which the reverse biasing mechanism or the reverse biasing spring starts to act on the seat back when the seat back tilts forward, can be arbitrarily set. Is possible.

  The reason will be described in detail with reference to FIG. However, in the following description, it is assumed that the predetermined angle is a neutral position and the predetermined direction is forward, that is, the main spring mechanism (main biasing mechanism) biases the seat back toward the front. The reverse spring mechanism (reverse biasing spring) exerts a biasing force acting rearward on the seat in the angular range on the front side from the neutral position of the seat back.

  The reverse urging mechanism (reverse urging spring) of the present invention is a main spring mechanism (main urging mechanism) shown in FIG. Before the urging force acts on the seat back, the reverse urging spring accumulates torque for urging the seat back toward the rear in the direction opposite to the main spring mechanism (tension or elastic compression force is applied). keeping). Preferably, at this time, the torque (biasing force) accumulated by the reverse biasing mechanism of the present invention is not transmitted to the seat back. Therefore, when the seat is tilted forward, the reverse biasing mechanism (reverse biasing spring) of the present invention immediately stores the large torque accumulated backward when the seat back reaches the neutral position in FIG. This is because the main spring mechanism (main urging mechanism) acts on the seat back and largely cancels the forward torque acting on the seat back, so that the forward tilting speed of the seat back can be rapidly reduced. . Therefore, in the torque diagram by the seat reclining device of the present invention, there is no torque between the torque line on the front side (minus side) from the neutral position and the torque line on the rear side (plus side) from the neutral position. There is an amount of step (jumping from the rear torque line to the front torque line at a predetermined angle).

  Referring to FIG. 9, according to the reclining device of Patent Document 2, the spiral reverse biasing spring starts to apply a biasing force to the seat back (the main spring independent operation region and the reverse biasing spring operation). There is no step between the torque line on the front side (minus side) and the torque line on the rear side of the torque line (the transition point with respect to the region), and it is only bent.

  The reason is that when the spiral reverse biasing spring starts to apply a biasing force to the seat back, the spiral reverse biasing spring is in an initial length state and is not elastically compressed, and accumulates the elastic force. It is because it is not. Therefore, even if the reverse biasing spring starts to act (becomes compressed), the torque that the main spring biases the seat back forward is not canceled immediately, and thus the forward tilting speed of the seat back is Does not drop immediately after passing through the vertical position.

  According to the present invention, the main biasing mechanism or the main spring mechanism generates a biasing force that biases the seat back from the front to the rear, and the reverse biasing mechanism biases the seat back from the rear to the front. Assuming that the urging force to generate is generated, especially the speed when the seat back starts to lean forward can be greatly reduced, so that the feeling of harm when sandwiched between the seat back and the seat cushion is reduced, In addition, a phenomenon such as a collision of the seat back with a load placed on the seat cushion at a high speed is prevented.

  According to the present invention, the main spring that urges the seat back toward a predetermined direction (for example, from the front to the back) is disposed on the side surface of the seat back, and the seat back is set in the opposite direction (for example, from the back to the front) By adopting a coiled spring as the reverse biasing spring that biases toward the side, and arranging the coiled spring on the side surface of the seat cushion, the dead space on the side surface of the seat cushion can be used effectively, and the lateral direction of the seat reclining device Can be suppressed as much as possible. Therefore, when the seat reclining device according to the present invention is applied to a vehicle seat, a limited space in the vehicle can be used effectively.

  Further, according to the seat reclining device according to the fourth aspect of the present invention, when the seat back is tilted in a predetermined direction (for example, from the rear to the front), the torque generated by the reverse biasing mechanism or the reverse biasing spring is generated. That is, since the rising of the torque that urges the seat back in the opposite direction (for example, from the front to the rear) is large, the speed at which the seat back falls can be greatly reduced from the moment the seat back starts to fall. The safety of the seat reclining device is improved.

  In a preferred embodiment of the present invention, the reverse biasing mechanism includes a reverse biasing spring that generates a biasing force that biases the seat back in the opposite direction, and is swingable according to the rotation of the seat back. And a stopper for preventing the link from swinging in the opposite direction outside the predetermined angle range, and the link is reversely attached to the seat back within the predetermined angle range. The biasing force of the reverse biasing spring is transmitted to the seat back via the biasing spring, and is sandwiched between the stopper and the reverse biasing spring outside the same range, and the reverse biasing spring The urging force is not transmitted to the seat back.

  In this configuration, the main biasing mechanism, particularly the main spring mechanism, generates a biasing force that biases the seat back from the front to the rear, and the reverse biasing mechanism biases the seat back from the rear to the front. If the predetermined angle range is an angle range from the neutral position to the front, the link is a seat back angle range from the neutral position to the front, and the link is between the seat back and the reverse bias spring. Connect and connect between the stopper and the reverse biasing spring in the seat back angle range from the neutral position to the rear, and the reverse biasing spring accumulates the biasing force, but the biasing force is not in the seat back Not transmitted. According to this aspect, by interposing a link between the reverse biasing spring and the seat back, a coiled spring that is inexpensive and requires a small space for arrangement can be used for the reverse biasing spring. A spring can be placed on the side of the seat cushion.

  In a preferred embodiment of the present invention, the link is not urged from the seat back outside the predetermined angle range (for example, the seat back or integrated with the first portion pivotably supported). A second portion that is biased from the seat back within the predetermined angular range (for example, abutting the seat back or a member integral therewith) and the reverse bias spring. A third portion and a fourth portion that contacts the stopper so that the link does not rotate outside the predetermined angle range.

  In a preferred embodiment of the present invention, the reverse biasing mechanism is a plate-like reverse mechanism that generates a biasing force that biases the seatback in the opposite direction while being deformable according to the rotation of the seatback. A biasing spring; and a stopper for stopping the plate-like reverse biasing spring from swinging in the opposite direction outside the predetermined angle range. The biasing force is applied to the seatback while being pressed from the seatback within the angular range of, and is restrained by the stopper so as not to be pressed from the seatback outside the same range, and the biasing force is applied to the seatback. It does not act. According to this embodiment, the number of components and the installation space of the apparatus are reduced by having the reverse biasing spring also function as the link.

  In a preferred embodiment of the present invention, when the reverse biasing torque starts to act on the seat back, the reverse biasing torque accumulated in the reverse biasing spring can be freely set, thereby It is possible to freely limit the speed at which the player starts to fall forward.

  In a preferred embodiment of the present invention, the seat reclining device of the present invention is disposed on both sides or one side of the seat.

  An embodiment of the present invention will be described below with reference to the drawings. FIG. 1A is a side view of a seat to which the seat reclining device according to the first embodiment of the present invention is applied. FIG. 1B is an exploded view of the seat reclining device according to the first embodiment of the present invention. FIG. 2 is an enlarged side view of a main part of the seat reclining device of FIG. FIG. 3 is a front view of the seat reclining device of FIG. 4 is an enlarged side view of a main part of the seat reclining device of FIG.

  FIG. 2 illustrates a state in which the seat back is in a position rotated slightly rearward from the neutral position. Further, in this embodiment, the neutral position is a rotational position inclined slightly rearward from the vertical position of the seat back, and the reverse biasing mechanism operates on the front side from the neutral position.

  Referring to FIGS. 1A to 2, the seat reclining device according to the first embodiment of the present invention is a device for adjusting the rotation angle of the seat back 2 with respect to the seat cushion 1. A main spring mechanism (main urging mechanism) 3 that urges forward, and a seat back 2 that urges the seat back 2 rearward outside a predetermined angular range of the seat back 2 (angle range that goes backward from the neutral position). A reverse urging mechanism 4 that accumulates the urging force to be transmitted and transmits at least the accumulated urging force to the seat back 2 within the predetermined angle range (angle range from the neutral position to the front). Have.

  Since the seat triclining device according to the present embodiment has the same structure on the left and right side surfaces of the seat, only the structure on one side will be described below.

  The main spring mechanism 3 is disposed on the side surface of the seat back 2, and is directly or indirectly connected between the seat cushion 1 and the seat back 2, and is a spiral shape that constantly biases the seat back 2 forward. A main spring 5 is provided.

  The reverse biasing mechanism 4 is disposed on the side surface of the seat cushion 1 and is located below the main spring 5 and is directly or indirectly connected between the seat cushion 1 and the seat back 2, The urging force for urging the seat back 2 backward is accumulated outside the angular range (the angular range from the neutral position toward the rear) (the urging force accumulated in the reverse urging mechanism 4 within this range is At least when the seatback 2 is tilted forward within the predetermined angle range (angle range from the neutral position to the front), that is, when the seatback 2 is tilted forward. A coiled reverse biasing spring 6 acting on In this embodiment, a tension spring is used as the reverse biasing spring 6, and the reverse biasing spring 6 always generates tension.

  The coiled reverse biasing spring 6 is arranged below the spiral main spring 5 without being arranged in parallel to the seat lateral direction, so that the lateral extension of the seat reclining device is suppressed. .

  A lower arm 9 is attached to the seat cushion 1, and a lower hook 10 is attached to the lower arm 9. An upper arm 11 is attached to the seat back 2, and an upper hook 12 is attached to the upper arm 11. One end of the main spring 5 is engaged with the right side of the side protrusion of the upper hook 12 in FIG. 2, and the other end of the main spring 5 is engaged with the lower side of the side protrusion of the lower hook 10 in FIG. 2. , Always compressed. The seat back 2 rotates around a hinge pin 14 that passes through the lower arm 9 and the upper arm 11.

  Between the lower arm 9 and the upper arm 11, a recliner 16 for locking the seat back 2 to the seat cushion 1 so as to be releasable at an arbitrary rotation angle is disposed. The lock of the recliner 16 is released by swinging the release lever 17. Various mechanisms can be applied to the mechanism for releasably locking the seat back 2 at a predetermined rotation angle via the recliner 16. For example, the recliner 16 and the recliner 16 can be operated by swinging the release lever 17. A mechanism having a ball and a cam that are releasably engaged can be used.

  On the side of the main spring 5, a link 7 is fitted into the hinge pin 14 so as to be swingable according to the rotation of the seat back 2, and is prevented from coming off by an E-ring 15. The lower arm 9 prevents the link 7 from swinging outside the predetermined angle range of the seat back 2 (angle range from the neutral position to the rear), particularly the clockwise swing in FIG. A stopper 8 that allows the rocking is fixed inside (in an angular range from the neutral position to the front).

  The link 7 is interposed between the seatback 2 and the reverse biasing spring 6 within the predetermined angle range (angle range from the neutral position to the front), and applies the biasing force of the reverse biasing spring 6 to the seatback 2. The urging force of the reverse urging spring 6 is not transmitted to the seat back 2 by being interposed between the stopper 8 and the reverse urging spring 6 outside the same range (angle range from the neutral position toward the rear).

  Specifically, the link 7 has first to fourth portions 7a to 7d. The first portion 7 a is pivotally supported with respect to the seat cushion 1 or the seat back 2 via the hinge pin 14.

  The second portion 7b is attached to the seat back 2 away from the contact portion 12a on the left side in FIG. 2 of the side protrusion of the upper hook 12 outside the predetermined angle range (angle range toward the rear from the neutral position). It is not biased but is abutted against the abutting portion 12a that rotates integrally with the seat back 2 within the predetermined angle range.

  The third portion 7 c is connected to the reverse biasing spring 6. As a result, the link 7 always receives a biasing force acting in the clockwise direction in FIG. 2 from the reverse biasing spring 6. The fourth portion 7d contacts the stopper 8 so that the link 7 does not rotate outside the predetermined angle range (angle range from the neutral position toward the rear).

  After all, the spiral main spring 5 is compression-inserted between the lower hook 10 and the upper hook 12, and the coiled reverse biasing spring 6 includes the spring hook 13 attached to the lower arm 9 and the third portion of the link 7. It is tensioned between 7c. Thus, the main spring mechanism 3 basically includes the spiral main spring 5, the lower hook 10 and the upper hook 12, and the reverse biasing mechanism 4 basically includes the coiled reverse biasing spring 6, The abutting portion 12 a of the link 7, the stopper 8, the spring hook 13, and the upper hook 12 is configured.

  The operation of the seat reclining device according to the first embodiment of the present invention described above will be described. FIG. 4 illustrates a state in the apparatus according to the present embodiment when the seat back is in a position rotated slightly rearward from the neutral position. FIG. 5 illustrates a state in the apparatus according to the present embodiment when the seatback is at a position rotated slightly forward from the neutral position.

  FIG. 6 is a torque diagram of the seat reclining device according to the first embodiment of the present invention. In FIG. 6, the rotation angle (tilt angle) of the seat back is the X axis, the torque that the reclining device of this embodiment acts on the seat back is the Y axis, and the rotation angle of the seat back is behind the vertical position. The torque of the torque relative to the rotation angle (tilt angle) is defined as a positive side, a forward side as a negative side, a torque that biases the seat back forward as a positive side, and a torque that biases the seat back as a negative side. A torque line indicating the change is drawn.

  Referring to FIG. 4, when the seat back 2 of FIG. 1 is located outside the predetermined angle range (angle range from the neutral position toward the rear), that is, in the main spring single operation region in FIG. 5 urges the seat back 2 forward. At this time, the reverse biasing spring 6 which is a tension spring is in a state longer than its initial length and generates a biasing force (tension). However, since the link 7 is restrained by the stopper 8, the reverse biasing spring 6 is reversely biased. The urging force of the urging spring 6 cannot be transmitted to the seat back 2. Therefore, when the seat back 2 is unlocked by operating the release lever 17, the seat back 2 is rotated forward at a relatively high speed by the urging force of the main spring 5 in the forward direction, that is, , Going forward.

  4 to 5, when the seat back 2 of FIG. 1 rotates from the rear to the front, the link 7 comes into contact with the contact portion 12a when passing through the neutral position in FIG. 7 receives an urging force such that the link 7 rotates counterclockwise in FIG. 5 from the seat back 2, and the reverse urging spring 6 connected to the link 7 further extends. As a result, a large urging force (elastic force) accumulated in the reverse urging spring suddenly acts on the seat back 2 at the neutral position, and the forward tilting speed of the seat back 2 is greatly reduced.

  Referring to FIG. 5, when the seat back 2 of FIG. 1 passes through the neutral position in FIG. 7 and further falls forward, the link 7 maintains a contact state with the contact portion 12 a, and the link 7 The reverse biasing spring 6 connected to the link 7 is further extended by receiving a biasing force from the back 2 such that the link 7 rotates counterclockwise in FIG. As a result, the urging force accumulated in the reverse urging spring continues to act on the seat back 2 to reduce the forward tilting speed of the seat back 2.

  The above operation will be described with reference to FIG. The torque line on the front side from the neutral position (predetermined angle) of the seat back is located below the torque line on the rear side along the Y axis, and both lines have a step at the neutral position. The size of can be arbitrarily set as required. Therefore, according to the seat reclining device of the present embodiment, when the seat back is tilted forward from the rear to the front, the torque generated by the reverse biasing spring, that is, the seat back is urged from the front to the rear. Since the rising of the torque is large, the speed at which the seat back tilts forward from the moment when the seat back passes through the neutral position can be greatly reduced, and the safety of the seat reclining device is improved.

  In the present embodiment, for the point that the seat reclining device according to the present embodiment has the same configuration and operation as the seat reclining device according to the first embodiment, the description of the first embodiment can be referred to as appropriate. In the following, differences between the present embodiment and the first embodiment will be mainly described.

  FIG. 7 is an exploded view of the seat reclining device according to the second embodiment of the present invention. FIG. 8 is an enlarged side view of a main part of the seat reclining device of FIG. 7 and 8, the reverse biasing mechanism 4 is deformable according to the rotation of the seat back 2 in FIG. 1A, and has a biasing force that biases the seat back 2 rearward. The generated plate-like reverse biasing spring 21 and a lower stopper for preventing the plate-like reverse biasing spring 21 from swinging or deforming in the opposite direction outside a predetermined angle range (angle range from the neutral position toward the rear). And upper stoppers 22 and 23. The lower stoppers 22 and 23 are fixed to the lower arm 9 and the upper arm 11, respectively. Both ends of the plate-like reverse biasing spring 21 are engaged with the lower stopper and the upper stoppers 22 and 23 and are interposed between the lower stopper and the upper stoppers 22 and 23 in a constantly compressed state.

  The plate-like reverse biasing spring 21 is pressed from the seat back 2 via the contact portion 12a and acts on the seat back 2 within a predetermined angle range (angle range from the neutral position to the front). Then, the seat back 2 is urged rearward, and is restrained between the lower stopper and the upper stoppers 22 and 23 so as not to be pressed from the seat back 2 outside the same range (angle range from the neutral position to the rear). Does not act on the seat back 2. According to the reverse biasing mechanism 4 of the present embodiment, the plate-shaped reverse biasing spring 21 is also used as the function of the link 7 of the first embodiment, thereby reducing the number of parts and the installation space for the apparatus.

  The reclining device of the present invention is suitably applied to a vehicle seat or other seats.

FIG. 1A is a side view of a seat to which the seat reclining device according to the first embodiment of the present invention is applied. FIG. 1B is an exploded view of the seat reclining device according to the first embodiment of the present invention. It is a principal part enlarged side view of the seat reclining apparatus of FIG. 1 (B), and illustrates a state when the seat back (upper arm) is in a position rotated slightly rearward from the neutral position. FIG. 3 is a front view of the seat reclining device of FIG. 2. It is a principal part expanded side view of the seat reclining apparatus of FIG. FIG. 5 is an operation diagram of FIG. 4. It is a torque diagram of the seat reclining device concerning Example 1 of the present invention. It is an exploded view of the seat reclining device concerning Example 2 of the present invention. It is a principal part expanded side view of the seat reclining apparatus of FIG. FIG. 9 is a torque diagram of the reclining device according to Patent Document 2.

Explanation of symbols

1 Seat cushion 2 Seat back 3 Main spring mechanism (main biasing mechanism)
4 Reverse Energizing Mechanism 5 Main Spring 6 Coiled Reverse Energizing Spring 7 Link 7a-7d First to Fourth Parts 8 Stopper 9 Lower Arm 10 Lower Hook 11 Upper Arm 12 Upper Hook 12a Abutting Part 13 Spring Hook 14 Hinge Pin 15 E Ring 16 Recliner 17 Release lever 21 Plate-like reverse biasing spring 22 Lower stopper 23 Upper stopper

Claims (7)

A seat reclining device for adjusting a rotation angle of a seat back with respect to a seat cushion,
A main biasing mechanism for biasing the seat back in a predetermined direction;
Outside the predetermined angular range of the seat back, the urging force accumulated for urging the seat back in the direction opposite to the predetermined direction cannot be transmitted to the seat back, and at least within the predetermined range A reverse urging mechanism for transmitting the accumulated urging force to the seat back;
A seat reclining device comprising: A seat reclining device for adjusting a rotation angle of a seat back with respect to a seat cushion,
A main spring mechanism for urging the seat back in a predetermined direction;
An urging force for urging the seat back in a direction opposite to the predetermined direction outside the predetermined angle range of the seat back is accumulated, and at least the accumulated urging force is accumulated within the predetermined angle range. A reverse urging mechanism for transmitting to the seat back;
A seat reclining device comprising: The reverse biasing mechanism is
A reverse biasing spring that generates a biasing force for biasing the seat back in the opposite direction;
A link swingable according to the rotation of the seat back;
A stopper for stopping the swinging of the link outside the predetermined angle range;
Have
The link is interposed between the seat back and the reverse urging spring within the predetermined angle range, and transmits the urging force of the reverse urging spring to the seat back. Between the reverse biasing spring and not transmitting the biasing force of the reverse biasing spring to the seat back,
The seat reclining device according to claim 1 or 2.   The link includes a first portion pivotably supported, and a second portion biased from the seat back within the predetermined angle range without being biased from the seat back outside the predetermined angle range. A third portion connected to the reverse biasing spring, and a fourth portion that contacts the stopper so that the link does not rotate outside the predetermined angle range. The seat reclining device according to claim 3. The reverse biasing mechanism is
A plate-like reverse biasing spring that is deformable according to the rotation of the seatback and generates a biasing force that biases the seatback in the opposite direction;
A stopper for preventing the plate-like reverse biasing spring from swinging in the opposite direction outside the predetermined angle range;
Have
The plate-like reverse biasing spring is pressed from the seat back within the predetermined angle range and acts on the seat back with the biasing force, and is not pressed from the seat back outside the range. To prevent the urging force from acting on the seat back.
The reclining device according to claim 1 or 2. A reclining device for adjusting a rotation angle of a seat back with respect to a seat cushion,
A spiral main spring that is disposed on a side surface of the seat back and is directly or indirectly connected between the seat cushion and the seat back and biases the seat back in a predetermined direction;
The seat back is disposed on a side surface of the seat cushion and positioned below the main spring and directly or indirectly connected between the seat cushion and the seat back, and outside the predetermined angular range of the seat back. A coiled reverse biasing spring that accumulates a biasing force for biasing the seating force in a direction opposite to the predetermined direction, and acts at least the stored biasing force on the seat back within the predetermined angle range. When,
A seat reclining device comprising:   A reclining device for adjusting a rotation angle of a seat back with respect to a seat cushion, wherein the rotation angle of the seat back is an X axis, and a torque acting on the seat back by the reclining device is a Y axis, and the seat The rotation angle of the back is the positive side, the negative side is the front side, the torque that biases the seat back forward is the positive side, and the torque that biases the rear side is the negative side. In the torque diagram in which a torque line showing the change of the torque with respect to the angle is drawn, the torque line on the front side of the predetermined angle of the seat back is lower along the Y axis than the torque line on the rear side. A seat reclining device that is positioned and has a step between the two lines at the predetermined angle.

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