JP7194650B2 - Posture control system and vehicle seat - Google Patents

Description

The present disclosure relates to attitude control systems and vehicle seats.

A vehicle seat is known that has a reclining device that adjusts the angle of the seat back in multiple stages. This reclining device has a lock mechanism that restricts swinging of the seat back at a plurality of fixed positions (see Patent Document 1).

Further, the seat back swings in the seat front-rear direction by a swing mechanism having an actuator and a rotating body. The rotating body rotates so as to push the back frame toward the front or the rear of the seat by the abutting portion, thereby electrically swinging the seat back.

Also, the rotating body is controlled by the control unit together with the lock mechanism. After unlocking the lock mechanism, the control unit rotates the rotating body to tilt the seat back forward and put it in the stowed state.

JP 2016-215995 A

The lock mechanism described above can be unlocked by manual operation in addition to unlocking by the control unit. For example, after manually unlocking, the seat back can be further manually swung.

When the seat back is swung to a fixed position forward from the current position by such a manual operation, the contact portion of the seat back and the rotator separates, leaving the contact portion behind the seat back. The locking mechanism is locked in the separated state. Further, even when the seatback is electrically swung, the contact portion and the seatback may be separated from each other depending on the position of the seatback.

In such a separated state, when the seat back is unlocked to swing forward by the swing mechanism, the seat back swings backward by its own weight to a position where it contacts the contact portion.

On the other hand, by rotating the rotating body to bring the abutting portion into contact with the seat back and then releasing the locking mechanism, the rearward swinging of the seat back is suppressed. However, in this case, it takes a long time from when the forward swinging motion of the seatback is received until when the seatback actually starts swinging.

One aspect of the present disclosure is to provide a posture control system capable of rapidly swinging the seatback forward while suppressing the rearward swinging of the seatback in a multi-stage reclining seatback. purpose.

One aspect of the present disclosure is a seat cushion (2), a seat back (3) that can swing in the seat back-and-forth direction with respect to the seat cushion (2), and a back frame (5) that supports the seat back (3). and a lock mechanism (6) for restricting swinging of the back frame (5) in the longitudinal direction of the seat at a plurality of fixing positions including at least a first fixing position and a second fixing position behind the first fixing position. ), a rotator (71) having an abutting portion (71A) for pushing the back frame (5) forward of the seat to swing the back frame (5) forward of the seat, and rotating the rotator (71). A rocking mechanism (7) having a driving part (72) and a locking mechanism (6) are changed from a locked state in which rocking of the back frame (5) is restricted to a released state in which rocking of the back frame (5) is not restricted. A posture control system (10A) for controlling the posture of a seat body (1) provided with a lock operation actuator (8) that displaces the seat body (1).

The attitude control system (10A) comprises a controller (9) that controls a rocking mechanism (7) and a lock operation actuator (8). The control section (9) performs forward swinging processing to rotate the rotating body (71) so that the contact section (71A) pushes the back frame (5) forward of the seat.

In the forward swinging process, the control unit (9) drives the lock operation actuator (8) in parallel with the rotation of the rotor (71), and the lock mechanism (6) is displaced to the unlocked state. The abutment portion (71A) is brought into abutment with the back frame (5) first or at the same time as it is displaced to the released state.

According to such a configuration, in the forward swinging process, unlocking by the locking mechanism (6) and pressing of the abutting portion (71A) against the back frame (5) are performed simultaneously. The forward swinging of 3) can be executed quickly. Before or at the same time as the lock mechanism (6) is unlocked, the rotating body (71) is rotated so that the contact portion (71A) contacts the back frame (5). The rearward rocking motion of the back (3) is also suppressed.

In one aspect of the present disclosure, in the forward swinging process, the control section (9) causes the contact section (71A) to contact the back frame (5) before the lock mechanism (6) is displaced to the released state. You may contact. According to such a configuration, the rearward swinging of the seat back (3) is more reliably suppressed.

In one aspect of the present disclosure, the lock mechanism (6) is maintained in the unlocked state by driving the lock operation actuator (8), and is displaced from the unlocked state to the locked state by stopping the lock operation actuator (8). good. In the forward swinging process, the control section (9) stops the rotation of the rotor (71) when the contact section (71A) comes into contact with the back frame (5), and the lock mechanism (6) is released. After being displaced to the state, the rotating body (71) may be rotated again so that the contact portion (71A) pushes the back frame (5) forward of the seat while the lock operation actuator (8) is kept driven. According to such a configuration, while simplifying the configuration of the lock mechanism (6), it is possible to prevent the lock mechanism (6) from returning to the locked state before the contact portion (71A) pushes out the back frame (5). .

Another aspect of the present disclosure is a vehicle seat (10B) comprising a seat body (1) and the attitude control system (10A) described above.
According to such a configuration, it is possible to rapidly swing the seat back (3) forward while suppressing the rearward swinging of the seat back (3).

It should be noted that the symbols in each parenthesis above are examples showing the correspondence with the specific configurations and the like described in the embodiments described later, and the present disclosure is limited to the specific configurations and the like shown in the symbols in the parentheses. not something.

1A, 1B and 1C are schematic configuration diagrams showing a vehicle seat according to the embodiment. 2 is a schematic perspective view showing a back frame, a lock mechanism, and a swing mechanism of the vehicle seat of FIG. 1. FIG. 3A is a schematic side view showing the standby state of the lock mechanism, FIG. 3B is a schematic side view showing the first locked state of the lock mechanism, and FIG. 3C is the unlocked state of the lock mechanism. FIG. 3D is a schematic side view showing a second locked state of the lock mechanism; FIG. FIG. 4 is a schematic exploded perspective view of the swing mechanism. 5A, 5B, 5C, and 5D are schematic diagrams showing the positional relationship between the abutted portion of the back frame and the rotating body. FIG. 6 is a time chart showing control by the control unit. FIG. 7 is a flow diagram schematically showing forward swinging processing executed by the control unit.

Embodiments to which the present disclosure is applied will be described below with reference to the drawings.
[1. First Embodiment]
[1-1. composition]
A vehicle seat 10B shown in FIGS. 1A, 1B, and 1C includes a seat body 1 and an attitude control system 10A.

The vehicle seat 10B (that is, the seat body 1) of this embodiment is used as a seat for a driver's seat, a passenger's seat, or a rear seat of a vehicle. The direction in the following description and each drawing means the direction when the vehicle seat 10B (that is, the seat body 1) is assembled to the vehicle. In this embodiment, the width direction of the seat coincides with the left-right direction of the vehicle, and the front of the seat coincides with the front of the vehicle.

<Seat body>
The seat body 1 includes a seat cushion 2, a seat back 3, a cushion frame (not shown), a back frame 5 (see FIG. 2), a lock mechanism 6, a swing mechanism 7, and a lock operation actuator 8. .

The seat cushion 2 is a part for supporting the buttocks and the like of the seated person. The seat back 3 is a part for supporting the back of the seated person, and can swing in the seat longitudinal direction with respect to the seat cushion 2 .

The cushion frame supports the seat cushion 2. The back frame 5 supports the seat back 3.
As shown in FIG. 2, the back frame 5 has a right side frame 5A, a left side frame 5B, a contacted portion 5C, and a support bracket 5D.

The right side frame 5A and the left side frame 5B extend vertically and are spaced apart from each other in the seat width direction.
The contacted portion 5C is a pin-shaped member connected to the lower end portion of the right side frame 5A via a support bracket 5D. The central axis of the contacted portion 5C is parallel to the seat width direction. That is, the contacted portion 5C extends in the sheet width direction. Further, the abutted portion 5C is arranged in front of the seat with respect to the right side frame 5A. The abutted portion 5C does not move or rotate relative to the right side frame 5A.

The support bracket 5D is a plate-like member fixed to the lower end of the right side frame 5A. A contacted portion 5C is fixed to the support bracket 5D. Further, the support bracket 5D rotatably supports a rotor 71, which will be described later.

The seat back 3 is configured to be swingable at least between a first fixed position shown in FIG. 1A, a second fixed position shown in FIG. 1B, and a retracted position shown in FIG. 1C. The second fixing position is provided behind the first fixing position. At the retracted position, the seat back 3 is arranged so as to overlap the seat cushion 2, and the seat body 1 is folded.

(lock mechanism)
The lock mechanism 6 restricts the swinging motion of the seat back 3 in the seat back-and-forth direction at a plurality of fixing positions including at least a first fixing position and a second fixing position.

In this embodiment, the lock mechanism 6 is attached to the upper portion of the right side frame 5A of the back frame 5, as shown in FIG.
The lock mechanism 6 has a base plate 61, a hook 62, a standby plate 63, and a release link 64, as shown in FIG. 3A.

The hook 62 is vertically swingable and engages with either the first striker 11A or the second striker 11B from above. The first striker 11A and the second striker 11B are rod-shaped members that extend from the vehicle body toward the seat back 3 and are spaced apart from each other in the seat front-rear direction.

The hook 62 engages the first striker 11A in the first locking position (see Figure 3B). Also, the hook 62 engages the second striker 11B in the second fixed position (see FIG. 3D). The hook 62 is biased upward by an elastic body (not shown) so as to be separated from each striker.

The standby plate 63 can swing in the seat front-rear direction. The standby plate 63 is urged rearward of the seat by an elastic body (not shown) so as to be pressed against the first striker 11A from the front.

The release link 64 is a member that can move between a restriction position (see FIGS. 3B and 3D) that restricts swinging of the hook 62 and a release position (see FIGS. 3A and 3C) that releases the restriction. The release link 64 is moved between the restricted position and the released position by the lock operation actuator 8 .

In the standby state shown in FIG. 3A in which the lock mechanism 6 is not locked, the release link 64 is at the release position, and the hook 62 is pushed upward above the first striker 11A by the biasing force described above. In a state in which the base plate 61 has moved rearward due to the swinging motion of the seatback 3 toward the seat rearward, the release link 64 moves to the regulating position and presses the hook 62 downward, so that the hook 62 engages the first striker 11A. engage. As a result, the first striker 11A is clamped between the hook 62 and the standby plate 63. As shown in FIG. That is, the lock mechanism 6 shifts to the first locked state (see FIG. 3B) in which the seatback 3 is fixed at the first fixed position.

By moving the release link 64 to the release position from the first locked state, the engagement of the hook 62 with the first striker 11A is released, and the lock mechanism 6 enters the released state shown in FIG. 3C. In the released state, the seat back 3 can swing in the seat front-rear direction.

When the seat back 3 is further swung rearward from the released state of FIG. 3C, the release link 64 moves to the regulating position and presses the hook 62 downward, thereby engaging the hook 62 with the second striker 11B. do. As a result, the second striker 11B is clamped between the hook 62 and the standby plate 63. As shown in FIG. That is, the lock mechanism 6 shifts to the second locked state (see FIG. 3D) in which the seatback 3 is fixed at the second fixed position.

The lock mechanism 6 is maintained in a released state by driving a lock operation actuator 8, which will be described later, and is displaced from the released state to a first locked state or a second locked state when the lock operation actuator 8 is stopped.

(Swing mechanism)
The rocking mechanism 7 has a rotating body 71, a driving portion 72, a first auxiliary bracket 73, and a second auxiliary bracket 74, as shown in FIG.

The rotating body 71 is a disc-shaped member having teeth 71C formed on a part of the outer periphery. The rotating body 71 is a gear to which the output of a drive section 72, which will be described later, is transmitted via teeth 71C. The rotating body 71 is attached to the pin 5E so as to be axially rotatable around the pin 5E fixed to the support bracket 5D of the back frame 5. As shown in FIG. The center axis of the pin 5E (that is, the rotation axis of the rotor 71) is parallel to the seat width direction.

The rotating body 71 pushes the contacted portion 5C of the back frame 5 toward the front of the seat, thereby pushing the first contact portion 71A that swings the back frame 5 toward the front of the seat and the contacted portion 5C toward the rear of the seat. Thus, it has a second contact portion 71B for swinging the back frame 5 rearward of the seat.

As shown in FIG. 5A, the first contact portion 71A and the second contact portion 71B each protrude in the radial direction of the rotating body 71. As shown in FIG. The first contact portion 71</b>A and the second contact portion 71</b>B are arranged so as to sandwich the contacted portion 5</b>C of the back frame 5 along the circumferential direction of the rotating body 71 .

When the back frame 5 in the first fixed position (see FIG. 5A) or the second fixed position (see FIG. 5B) is swung in front of the seat, the first contact portion 71A moves the back frame 5 to the retracted position, for example. When it is moved, it abuts on the abutted portion 5C from behind due to the rotation of the rotating body 71 .

As shown in FIG. 5C, when the back frame 5 is swung rearward of the seat, for example, when the back frame 5 is moved from the retracted position to the first fixed position or the second fixed position, the second contact portion 71B is As the rotating body 71 rotates, it abuts against the abutted portion 5C from the front. The second contact portion 71B moves together with the first contact portion 71A as the rotor 71 rotates.

By pushing the abutted portion 5C against the first abutment portion 71A or the second abutment portion 71B, the back frame 5 is moved to the hinge 51 (see FIG. 2) attached to the lower portion of the left side frame 5B of the back frame 5. ) as an axis in the longitudinal direction of the seat.

The drive unit 72 is a device that rotates the rotating body 71 about its axis. As shown in FIG. 4, the driving section 72 has a rotary actuator 72A and a gearbox 72B. The rotary actuator 72A may be either electric or pneumatic. The power of the rotary actuator 72A is transmitted to the rotating body 71 via the gear box 72B that meshes with the teeth 71C of the rotating body 71. As shown in FIG.

In this embodiment, the drive unit 72 is attached to the lower portion of the right side frame 5A of the back frame 5 (that is, the support bracket 5D) via a first auxiliary bracket 73 and a second auxiliary bracket 74. As shown in FIG. The first auxiliary bracket 73 is attached to the support bracket 5D. A second auxiliary bracket 74 to which the driving portion 72 is attached is attached to the first auxiliary bracket 73 so as to sandwich the rotating body 71 .

(lock operation actuator)
A lock operation actuator 8 (see FIGS. 1A and 1B) shifts the lock mechanism 6 from a first locked state or a second locked state in which rocking of the back frame 5 is restricted to a released state in which rocking of the back frame 5 is not restricted. Displace. The lock operation actuator 8 may be either electric or pneumatic.

Specifically, the lock operation actuator 8 is driven to move the release link 64 of the lock mechanism 6 from the restricted position (see FIGS. 3B and 3D) to the released position (see FIG. 3C). While the lock operation actuator 8 is being driven, the release link 64 is held at the release position. When the lock operation actuator 8 stops, the release link 64 is displaced to the restricted position by the urging force.

<Attitude control system>
The attitude control system 10A controls the attitude of the seat body 1 . The posture control system 10A includes a controller 9 that electrically swings the seat back 3 by controlling the swing mechanism 7 and the lock operation actuator 8 . The controller 9 performs at least a forward swinging process and a backward swinging process.

The control unit 9 is configured by, for example, a microcomputer including a microprocessor, storage media such as RAM and ROM, and an input/output unit. The control unit 9 controls the rotation actuator 72A and the lock operation actuator 8 by executing a pre-stored program. Note that the control unit 9 may be incorporated in an electronic control unit (ECU) mounted on the vehicle.

The forward swinging process is performed when swinging the seat back 3 from the first fixing position or the second fixing position to the retracted position, and when swinging the seat back 3 from the second fixing position to the first fixing position. be. In the forward swinging process, the rotating body 71 is rotated so that the first contact portion 71A pushes the back frame 5 (that is, the contacted portion 5C) forward of the seat.

In the forward swinging process, the controller 9 drives the lock operation actuator 8 in parallel with the rotation of the rotating body 71 . That is, the control unit 9 drives the lock operation actuator 8 for unlocking and drives the drive unit 72 for swinging the back frame 5 forward.

Further, in the forward swinging process, the control section 9 brings the first contact section 71A into contact with the back frame 5 before the lock mechanism 6 is displaced to the released state. The control unit 9 brings the first contact portion 71A into contact with the back frame 5 prior to unlocking by adjusting the drive start timing, drive time, output, etc., of the lock operation actuator 8 and the drive unit 72, respectively.

In the forward swinging process, the lock operation actuator 8 may be driven before the driving portion 72, but it is preferable that the driving portion 72 is driven before the lock operation actuator 8 is driven. This makes it easier to bring the first contact portion 71A into contact with the back frame 5 before the lock is released. Since the operating speed of each actuator changes depending on the power supply voltage, it is preferable to adjust the drive start timing of the actuators according to the power supply voltage.

Further, in the forward swinging process, the control section 9 stops the rotation of the rotating body 71 when the first contact section 71A comes into contact with the back frame 5 (that is, sets the output of the driving section 72 to zero). . After the lock mechanism 6 is displaced to the released state, the control unit 9 restarts the rotating body 71 so that the first contact portion 71A pushes the back frame 5 forward of the seat while driving the lock operation actuator 8. rotate.

After the back frame 5 reaches a predetermined position (that is, the retracted position or the first fixed position), the controller 9 moves the rotor 71 to the standby position (see FIG. 5C or 5D) in preparation for the next operation. rotate.

Hereinafter, the forward swinging process by the controller 9 will be specifically described with reference to FIG. FIG. 6 is a time chart of forward swinging processing when the seatback 3 is tilted forward from the first fixed position to the retracted position.

When the input switch ("SW" in FIG. 6) for instructing the execution of forward folding is turned on while the seat back 3 ("SEAT" in FIG. 6) is in the first fixed position S1, the control unit 9 activates the lock operation actuator. 8 ("ACT2" in FIG. 6), the rotary actuator 72A ("ACT1" in FIG. 6) of the driving portion 72 is driven in the direction (FWD) in which the first contact portion 71A moves forward.

The control unit 9 drives the lock operation actuator 8 immediately after starting to drive the rotary actuator 72A. As a result, the lock mechanism 6 is displaced toward the unlocked state simultaneously with the movement of the first contact portion 71A.

A certain amount of time (for example, about one second) elapses from the start of driving of the lock operation actuator 8 until the lock mechanism 6 is displaced to the unlocked state. In the meantime, the rotating body 71 is rotated by the rotary actuator 72A, and the first contact portion 71A ("ABUT" in FIG. 6) moves from the standby position P0 to the first position P1 and contacts the back frame 5. As shown in FIG.

At time T1 when the first contact portion 71A contacts the back frame 5, the controller 9 stops driving the rotary actuator 72A. After that, the control unit 9 keeps driving the lock operation actuator 8 even after the lock mechanism 6 is released. The control unit 9 drives the rotary actuator 72A again at time T2 while maintaining the drive of the lock operation actuator 8, and rotates the rotating body 71 again.

As a result, the unlocked back frame 5 is pushed forward of the seat by the first contact portion 71A of the rotating body 71 . As a result, the seat back 3 moves to the retracted position SS. Although the first contact portion 71A moves to the second position P2, the seat back 3 falls forward under its own weight halfway through, so the back frame 5 separates from the first contact portion 71A in the middle of swinging. .

After the seat back 3 reaches the retracted position SS, the control unit 9 drives the rotary actuator 72A to BWD, which is the opposite direction to FWD, thereby moving the first contact portion 71A from the second position P2 to the standby position P0. back to

After the lock mechanism 6 is released, the control unit 9 reduces the output of the lock operation actuator 8 in two stages. As a result, abnormal noise caused by sudden movement of the wire connecting the lock operation actuator 8 and the lock mechanism 6 is reduced.

In the rearward swinging process, the controller 9 rotates the rotating body in a direction to swing the back frame 5 rearward of the seat while the second contact portion 71B is in contact with or close to the contacted portion 5C of the back frame 5. Rotate 71. After that, when the seat back 3 reaches the first fixing position or the second fixing position, the controller 9 switches the lock mechanism 6 to the locked state.

[1-2. process]
Hereinafter, the forward swinging process executed by the control unit 9 will be described with reference to the flowchart of FIG.

In the forward rocking process, the controller 9 first determines whether the forward rocking switch is on (step S110). If the forward rocking switch is off (S110: NO), the controller 9 terminates the process. The forward rocking switch is operated when the seat back 3 is retracted or when the seat back 3 in the second fixed position is tilted forward to the first fixed position.

On the other hand, if the forward swing switch is on (S110: YES), the controller 9 rotates the rotating body 71 in the direction in which the first contact portion 71A moves forward of the seat (step S120). Subsequently, the controller 9 drives the lock operation actuator 8 (step S130).

After the lock operation actuator 8 is driven, the controller 9 determines whether or not the first contact portion 71A contacts the back frame 5 due to the rotation of the rotor 71 (step S140). Wait until it hits 5. The contact between the first contact portion 71A and the back frame 5 is determined by, for example, the pulse and torque of the rotary actuator 72A, the output of the sensor attached to the back frame 5, and the like.

After the first contact portion 71A contacts the back frame 5, the controller 9 stops the rotation of the rotor 71 (step S150). After the rotating body 71 stops, the control unit 9 determines whether or not the unlocking time has elapsed since the lock operation actuator 8 started to be driven (step S160), and waits until the unlocking time elapses. The unlocking time is the time required for the lock mechanism 6 in the locked state to be displaced to the unlocked state by driving the lock operation actuator 8 .

After the unlocking time has elapsed, the control unit 9 rotates the rotating body 71 in the direction in which the first contact portion 71A moves forward of the seat, and rocks the seat back 3 toward the front of the seat (step S170).

After the rotating body 71 starts rotating, the control unit 9 determines whether or not the seat back 3 has reached the target position (that is, the retracted position or the first fixed position) and thus the swinging of the seat back 3 has been completed (step S180). ), and waits until the swinging of the seat back 3 is completed. Whether or not the seat back 3 reaches the target position is detected, for example, by a limit switch provided in a mechanism for locking the seat back 3 at the target position.

After the swinging of the seat back 3 is completed, the controller 9 rotates the rotor 71 in the direction in which the first contact portion 71A moves rearward of the seat (step S190). Subsequently, the controller 9 determines whether or not the rotor 71 reaches the standby position (step S200), and waits until the rotor 71 reaches the standby position.

After the rotator 71 reaches the standby position, the controller 9 stops the rotation of the rotator 71 (step S210) and ends the forward swinging process.

[1-3. effect]
According to the embodiment detailed above, the following effects are obtained.
(1a) In the forward swinging process, the lock release by the lock mechanism 6 and the pressing of the first contact portion 71A against the back frame 5 are performed simultaneously, so the seat back 3 swings forward quickly. can run. Further, since the rotating body 71 is rotated so that the first contact portion 71A contacts the back frame 5 before the lock mechanism 6 is unlocked, the seat back 3 is also restrained from swinging backward. be.

(1b) After the lock is released, the rotating body 71 is rotated again while the lock operation actuator 8 is driven. It is avoided that the locking mechanism 6 returns to the locked state before being pushed out.

[2. Other embodiments]
Although the embodiments of the present disclosure have been described above, it is needless to say that the present disclosure is not limited to the above embodiments and can take various forms.

(2a) In the vehicle seat 10B of the above embodiment, the configuration of the lock mechanism 6 is an example. The lock mechanism 6 is not limited to the above configuration as long as it can restrict the swinging motion of the seat back 3 between the first fixed position and the second fixed position.

Also, the locking mechanism 6 may be capable of locking the seatback 3 at three or more fixed positions. For example, the third fixing position may be provided forward of the seat from the first fixing position, rearward of the seat from the second fixing position, or between the first fixing position and the second fixing position.

(2b) In the vehicle seat 10B of the above embodiment, the shape of the rotor 71 is an example. The rotating body 71 does not necessarily have to be disk-shaped with teeth 71C. Further, the first contact portion 71A and the second contact portion 71B may be configured to press portions of the back frame 5 other than the contacted portion 5C.

(2c) In the vehicle seat 10B of the above embodiment, in the forward swinging process, the controller 9 moves the first contact portion 71A to the back frame 5 at the same timing as the lock mechanism 6 is displaced to the released state. may be brought into contact with the

(2d) The attitude control system 10A and the vehicle seat 10B of the above embodiment can also be used for automobiles other than passenger cars, and vehicle seats other than automobiles, such as railway cars, ships, and aircraft.

(2e) The function of one component in the above embodiments may be distributed as multiple components, or the functions of multiple components may be integrated into one component. Also, part of the configuration of the above embodiment may be omitted. Also, at least a part of the configuration of the above embodiment may be added, replaced, etc. with respect to the configuration of the other above embodiment. It should be noted that all aspects included in the technical idea specified by the wording in the claims are embodiments of the present disclosure.

1... seat body, 2... seat cushion, 3... seat back, 5... back frame,
5A... right side frame, 5B... left side frame, 5C... contacted portion,
5D... support bracket, 5E... pin, 6... lock mechanism, 7... rocking mechanism,
8... lock operation actuator, 9... control section, 10A... attitude control system,
10B... vehicle seat, 11A, 11B... striker, 51... hinge,
61 ... base plate, 62 ... hook, 63 ... standby plate,
64 Release link 71 Rotating body 71A First contact portion 71B Second contact portion
71C...teeth, 72...drive unit, 72A...rotary actuator, 72B...gearbox,
73... First auxiliary bracket, 74... Second auxiliary bracket.

Claims (4)

seat cushion and
a seat back swingable in the longitudinal direction of the seat with respect to the seat cushion;
a back frame supporting the seat back;
a lock mechanism for restricting the back frame from swinging in the longitudinal direction of the seat at a plurality of fixing positions including at least a first fixing position and a second fixing position located rearward of the seat from the first fixing position;
a swing mechanism including a rotating body having an abutting portion that rocks the back frame forward of the seat by pushing the back frame forward of the seat; and a driving portion that rotates the rotating body;
a lock operation actuator that displaces the lock mechanism from a locked state that restricts swinging of the back frame to a released state that does not restrict swinging of the back frame;
A posture control system for controlling the posture of a seat body comprising
A control unit that controls the rocking mechanism and the lock operation actuator,
The control unit performs a forward swinging process of rotating the rotating body so that the contact unit pushes the back frame forward of the seat,
In the forward swinging process, the control unit drives the lock operation actuator in parallel with the rotation of the rotating body, and prior to displacing the lock mechanism to the unlocked state or to the unlocked state. A posture control system that causes the contact portion to contact the back frame at the same time as the position is displaced. The attitude control system of claim 1, wherein
In the posture control system, in the forward swinging process, the control section causes the contact section to contact the back frame before the lock mechanism is displaced to the released state. An attitude control system according to claim 2, wherein
The lock mechanism is maintained in the unlocked state by driving the lock operation actuator, and is displaced from the unlocked state to the locked state by stopping the lock operation actuator,
In the forward swinging process, the control unit stops rotation of the rotating body when the contact portion contacts the back frame, and after the lock mechanism is displaced to the unlocked state, the lock mechanism is displaced to the unlocked state. A posture control system in which the rotating body is re-rotated so that the abutting portion pushes the back frame forward of the seat while driving the operation actuator. the seat body;
an attitude control system according to any one of claims 1 to 3;
A vehicle seat with a

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