JP2012192912A - Vehicle seat - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a vehicle seat capable of returning the seat back to a position immediately before the start of the forward tilting thereof.SOLUTION: The vehicle seat includes a seat cushion attached to a vehicle body, the seat back attached to the seat cushion so as to be tiltable, a reclining device for adjusting the tilt angle of the seat back to the seat cushion, a tilt returning mechanism for tilting and returning the seat back by operating the reclining device, and a control device 60 for controlling the driving of the tilt returning mechanism. The control device 60 includes a storage means 66 for storing the tilt angle of the seat back and a discrimination means 62 for discriminating whether or not the seat back returned by the tilt returning mechanism reaches a tilt angle stored in the storage means 66.

Description

  The present invention relates to a forward tilt and return of a seat back provided in a vehicle seat.

  2. Description of the Related Art Conventionally, for example, a mechanism for raising a seat back described in Patent Document 1 has been proposed as a mechanism for performing forward tilting and returning of a seat back of a vehicle seat. The seat back raising mechanism includes an output vehicle that can be rotated by an electric device in a seat cushion on the free hinge side of the seat back, a reduction gear that can rotate only in one direction to the output vehicle via a one-way clutch bearing, and a reduction gear And another sector gear that rotates together with the shaft and the sector gear meshing with the gear are pivotally supported, and the wire end is connected to the sector gear. The other end of the seat is connected to a lever that can be rotated together with the seat back, and the sector gear is rotated forward by driving the electric device to pull the wire to the sector gear side, while the seat back can be changed from the lying down state to the standing state. By manually pushing down the seat back, the wire is pulled to the lever side and the sector gear moves to the one-way clutch base. It has been restored to the original state in the reverse rotation by the ring.

2001-239862

  The seat back raising mechanism described above operates the operation switch for driving the transmission device arranged near the opening of the rear part of the vehicle body, thereby coupling the wire to the free hinge, the sector gear, the reduction gear, the electric motor By winding the wire with a mechanism composed of the device and the one-way clutch bearing, the seat back can be raised substantially perpendicular to the seat cushion. However, the seat back raising mechanism is configured so that the seat back return position is the first-stage locking position of the reclining device (the seat back is substantially perpendicular to the seat cushion). In order to return to the position immediately before the start of the fall, it is necessary to adjust manually.

  The present invention has been made to solve the above-described problems, and an object of the present invention is to provide a vehicle seat that can return the seatback return position to a position just before the start of the forward leaning.

  In order to solve the above-described problems, the vehicle seat according to claim 1 adjusts the inclination angle of the seat back with respect to the seat cushion, the seat cushion attached to the vehicle body, the seat back attached to the seat cushion so as to be tiltable. The vehicle seat includes a reclining device that operates, a tilt return mechanism that operates the reclining device to tilt and return the seat back, and a control device that controls the drive of the tilt return mechanism. The present invention is characterized by comprising storage means for storing the inclination angle and determination means for determining whether or not the seat back to be returned by the tilt return mechanism has reached the inclination angle stored in the storage means.

  According to the vehicle seat of claim 1, the inclination angle of the seat back immediately before the start of the forward leaning is stored in the storage means, and it is determined whether the determination means has reached the inclination angle of the seat back stored in the storage means. Since it is possible, it becomes possible to make the seat back of the vehicle seat in the forward-falling state to the inclination angle immediately before the start of the forward-falling. This makes it possible to provide a vehicle seat that is easy to operate for the occupant.

It is a figure which shows the structure of the control apparatus with which a vehicle seat is equipped. It is a flowchart which shows the operation | movement procedure of the seat back which performs forward leaning operation. It is a figure which shows the operation | movement which a seat back leans forward, Comprising: It is a figure which shows the (a) forward tilt start position, (b) speed change position, and (c) forward tilt completion position. It is a flowchart which shows the operation | movement procedure of the seat back which performs reset operation | movement. It is a figure which shows the operation | movement which a seat back returns, Comprising: It is a figure which shows the (a) forward tilt completion position, (b) speed change position, and (c) forward tilt start position.

Embodiments of the present invention will be described below with reference to the drawings.
A vehicle seat 10 according to the present invention includes a seat cushion 20 that is attached to a vehicle body and is seated by an occupant, a seat back 30 that is tiltably attached to the seat cushion 20, and an inclination angle of the seat back 30 with respect to the seat cushion 20. A reclining device 40 that can adjust the inclination, a tilt return mechanism 50 that operates the reclining device 40 to tilt and return the seat back 30, and a control device 60 that controls the drive of the tilt return mechanism 50.

  The seat cushion 20 supports a seated occupant, and a seat rail 22 disposed on a vehicle body floor via a foot 21 and a seat cushion frame that is attached to the seat rail 22 and forms a skeleton of the seat cushion 20. 23. The seat cushion frame 23 is attached to a passenger seated on the seat cushion 20 so that a seat back 30, which will be described later, can be tilted forward and returned.

  The seat back 30 serves as a backrest for an occupant seated on the seat cushion 20, and a reclining device 40, which will be described later, is provided on one of the connecting portions with the seat cushion 20, and a free hinge is provided on the other. The seat back 30 is attached to the occupant front side (front) seated on the seat cushion 20 and the occupant rear side (rear side) seated on the seat cushion 20 by the reclining device 40 so as to be tiltable. In the present embodiment, the seat back 30 is provided with a reclining device 40 at one of the connecting portions with the seat cushion 20 and a free hinge at the other, but the reclining devices 40 are provided on both sides of the connecting portion with the seat cushion 20. You may employ | adopt the structure which connects both the reclining apparatuses 40 with a shaft, and rotates it synchronously.

  The reclining device 40 is a general reclining device 40 that has been used conventionally, and is provided at one of the connecting portions with the seat back 30 behind the seat cushion frame 23. The reclining device 40 is a device that makes it possible to adjust the inclination angle of the seat back 30 with respect to the seat cushion 20 and includes a lock mechanism 41 that restricts the tilt of the seat back 30 forward and backward. The lock mechanism 41 operates the operation member 56 included in the tilt return mechanism 50 described later, whereby the shaft 56a attached to the end of the operation member 56 rotates, and the seat back 30 cannot be tilted forward and returned. And a lock release state that allows the seat back 30 to be tilted forward and returned. Here, the lock mechanism 41 includes a mechanism that allows the seat back 30 to tilt forward (tilt forward) quickly to a certain angle to enable walk-in, and a mechanism that allows the tilt angle to be adjusted in multiple stages.

  The tilt return mechanism 50 is a mechanism that operates the reclining device 40 and performs forward tilt and return of the seat back 30 with respect to the seat cushion 20, and is provided at a connecting portion with the seat back 30 on the free hinge side. The tilt return mechanism 50 includes a motor 51 that serves as power for tilting and returning the seat back 30, a gear portion 52 that is driven by the motor 51, and the seat back 30 being tilted forward and backward as the gear portion 52 rotates. A seat back bracket 53 for returning, a biasing member 54 for biasing the seat back bracket 53, a seat cushion bracket 55 fixed to the seat cushion 20 side, and a shaft 56a that operates the lock mechanism 41 of the reclining device 40. Is configured by an operation member 56 that switches the state of the lock mechanism 41 and an actuator 57 that drives the operation member 56.

  The motor 51 is a general-purpose motor with a speed reducer that is widely distributed as power for performing the forward tilting and returning of the seat back 30, and the forward rotation of the seat back 30 causes the seat back 30 to tilt forward and reverse rotation. Thus, the seat back 30 is returned. The driving of the motor 51 is controlled by a control device 60 described later.

  The gear part 52 is a power transmission part that transmits the power of the rotating motor 51, and is engaged with a plurality of gears 52a that transmit the rotation of the output part of the motor 51, and an unevenness formed on the outer periphery of the gear 52a. And a sector gear 52b having teeth. The sector gear 52b is formed in a substantially fan shape, has external teeth on the outer peripheral edge, and includes a latching portion for latching a biasing member 54 described later on the side surface.

  The seat back bracket 53 is attached to be rotatable about a bearing 55a of a seat cushion bracket 55 described later. The seat back bracket 53 can be rotated with the rotation of the gear portion 52 and is regulated to a desired angle by the reclining device 40. Here, since the seat back bracket 53 is urged in a direction to elevate the seat back 30 by an urging member 54 described later, the seat back 30 is raised when the restriction by the reclining device 40 is released. It will be.

  The urging member 54 urges the seat back bracket 53 in the direction in which the seat back 30 stands up and makes the inclination angle of the seat back 30 stand up. One end of the urging member 54 is connected to the sector gear 52 b of the gear portion 52. The other end is hooked on a guide plate provided between a biasing member 54 and a seat cushion bracket 55 described later.

  The seat cushion bracket 55 is for fixing the tilt return mechanism 50 including the motor 51, the gear portion 52, the seat back bracket 53, the urging member 54, and the like to the seat cushion frame 23. The bearing 55a which penetrates the shaft 56a which has in an edge part is provided.

  The operation member 56 is an operation lever that switches between a locked state and an unlocked state of the reclining device 40 by rotating, and includes a shaft 56a. The operation member 56 rotates the shaft 56a and switches the state of the reclining device 40 when an actuator 57 described later is driven.

  The actuator 57 is a motor that drives the operating member, and the operating member rotates the operating member by operating a control device described later.

  The control device 60 is a device that controls the driving of the motor 51 and the actuator 57. As shown in FIG. 1, the control device 60 includes a determination unit 62 in an electronic control unit (ECU) 61 including a CPU, a ROM, a RAM, and the like. . The ECU 61 includes a pulse sensor 63 for detecting the rotation of the motor 51 on the input side, a forward tilt operation switch 64 for operating the forward tilt of the seat back 30, an automatic return switch 65 for operating the return of the seat back 30, and a seat. A storage unit 66 that stores the inclination angle of the back 30 is provided, and an actuator 57 that drives the operation member 56 and a motor 51 that performs forward inclination and return of the seat back 30 are provided on the output side. Here, a PWM driver 67 is incorporated in the output circuit for controlling the driving of the motor 51, and the motor 51 is PWM-controlled.

  The discriminating means 62 is a means for discriminating whether the inclination angle of the seat back 30 has approached or reached an angle stored in the storage means 66 described later, and the change in speed set by the storage means 66 is determined by the inclination angle of the seat back 30. When it is determined that the position has been reached, a signal is transmitted to the PWM driver 67 of the output circuit that drives the motor 51 so that the drive of the motor 51 is PWM-controlled. Further, when the determination means 62 determines that the inclination angle of the seat back 30 has reached the inclination angle of the seat back 30 stored in the storage means 66, the determination means 62 sends a signal to the output circuit that drives the motor 51 to stop the motor 51. introduce.

  The pulse sensor 63 is a sensor that detects the rotation of the motor 51. The pulse sensor 63 detects the rotation of the motor 51 in the forward and reverse directions and detects the rotation number of the motor 51, whereby the inclination angle of the seat back 30 with respect to the seat cushion 20 is detected. Is detected. Specifically, the pulse sensor 63 generates two pulse signals having different phases, and determines the forward / reverse direction of the motor 51 depending on which one of the pulse signals rises first.

  The storage means 66 is an angle sensor capable of storing the tilt angle of the seat back 30 and stores the tilt angle of the seat back 30 at the forward tilt start position and the tilt angle of the seat back 30 at the forward tilt completion position. . Here, the inclination angle of the seat back 30 at the position of starting to lean forward is the angle of inclination of the seat back 30 when the occupant operates the forward leaning operation switch 64, and before the seat back 30 leans forward. The inclination angle of the back 30 is stored. Further, the storage means 66 sets speed change positions for changing the driving speed of the motor 51 near the inclination angle of the seat back 30 at the forward lean start position and near the inclination angle of the seat back 30 at the forward lean completion position, respectively. Yes.

  The PWM driver 67 changes the duty ratio of the pulse signal, and changes the duty ratio to make the motor 51 rotate. Here, the duty ratio is a ratio between the period of the pulse signal and the pulse width. When the pulse width is reduced with respect to the period, the motor 51 can be rotated at a low speed, and the pulse width is set with respect to the period. If it is increased, the motor 51 can be rotated at a high speed. The PWM driver 67 tilts forward by PWM control of the driving of the motor 51 when the tilt angle of the seat back 30 that tilts forward reaches the speed change position set in the vicinity of the forward tilt completion position stored in the storage means 66. The speed of the seat back 30 is reduced. Further, the PWM driver 67 performs the PWM control of the driving of the motor 51 even when the inclination angle of the returning seat back 30 reaches the speed change position set in the vicinity of the forward tilt start position. Decrease the speed of 30.

  Next, an operation of tilting forward (falling forward) until the seat back 30 included in the vehicle seat 10 of the present invention becomes substantially parallel to the seat cushion 20 will be described with reference to FIGS. 2 and 3. Here, the seat back 30 of the vehicle seat 10 is adjusted to an arbitrary angle by an occupant seated on the seat cushion 20.

  The occupant operates a forward tilt operation switch 64 provided in the control device 60 in order to perform the forward tilt of the seat back 30 adjusted to an arbitrary angle. Then, the memory | storage means 66 with which the control apparatus 60 is provided memorize | stores the forward tilt start position of the seat back 30. FIG.

The vehicle seat 10 storing the forward tilt start position in the storage means 66 of the control device 60 drives the actuator 57 in a direction in which the lock mechanism 41 of the reclining device 40 unlocks the operation member 56 included in the tilt return mechanism 50. By rotating, the lock mechanism 41 of the reclining device 40 is brought into an unlocked state. When the lock mechanism 41 of the reclining device 40 is released, the motor 51 of the tilt return mechanism 50 confirms the driving direction (forward rotation direction) by the pulse sensor 63 of the control device 60 and then tilts the seat back 30 at a high speed. . Here, whether the motor 51 of the tilt return mechanism 50 that tilts the seat back 30 detects the speed change position set by the storage means 66 by the pulse sensor 63 and reaches the speed change position by the discrimination means 62. Therefore, when the speed change position set by the storage means 66 is reached, the PWM control is performed by the PWM driver 67. The motor 51 that is PWM controlled completes forward tilting by driving at a low speed from the speed change position to the forward tilt completion position. Here, it is assumed that the reclining device 40 switches to the locked state when the forward tilt is completed.

  As described above, the forward tilting operation of the seat back 30 by the vehicle seat 10 of the present invention is performed by driving the motor 51 at a high speed from the forward tilt start position to the speed change position, and then from the speed change position to the forward tilt completion position. Until then, the seat back 30 is tilted forward (tilt forward) by driving the motor 51 at a low speed.

  Next, an operation in which the seat back 30 included in the vehicle seat 10 according to the present invention returns from a state substantially parallel to the seat cushion 20 (forward-falling state) to a forward-falling start position will be described with reference to FIGS. 4 and 5.

  The occupant operates an automatic return switch 65 provided in the control device 60 in order to return the seatback 30 in the forward-falling state to the forward-falling start position.

  The vehicle seat 10 in which the automatic return switch 65 is operated is reclined by driving the actuator 57 and turning the operation member 56 included in the tilt return mechanism 50 in a direction in which the lock mechanism 41 of the reclining device 40 is unlocked. The lock mechanism 41 of the device 40 is set to the unlocked state. When the lock mechanism 41 of the reclining device 40 is unlocked, the motor 51 of the tilt return mechanism 50 confirms the drive direction (reverse rotation direction) by the pulse sensor 63 of the control device 60 and then returns the seat back 30 at a high speed. . Here, the motor 51 of the tilt return mechanism 50 that is returning the seat back 30 detects the speed change position set by the storage means 66 and the forward tilt start position by the pulse sensor 63, and then determines the speed by the determination means 62. It is possible to determine whether the change position and the forward tilt start position have been reached. For this reason, when the speed change position set by the storage means 66 is reached, the PWM control is performed by the PWM driver 67, and when it reaches the forward tilt start position, it stops. Here, when the seat back 30 is restored, the motor 51 restores the seat back 30 while always discriminating whether it is the speed change position or the forward tilt start position by the discrimination means 62.

  As described above, the returning operation of the seat back 30 by the vehicle seat 10 of the present invention is performed from the speed change position to the forward tilt start position after the motor 51 is driven at high speed from the forward tilt completion position to the speed change position. The seat back 30 is restored by driving the motor 51 at a low speed. Here, since the forward tilt start position stores the state of the seat back 30 before the forward tilt start by the storage means, the seat back 30 is returned when the inclination angle of the seat back 30 is arbitrarily adjusted. Is possible.

DESCRIPTION OF SYMBOLS 10 Vehicle seat 20 Seat cushion 30 Seat back 51 Motor 57 Actuator 60 Control apparatus 61 ECU
62 Discriminating means 63 Pulse sensor 64 Forward tilting operation switch 65 Automatic return switch 66 Storage means 67 PWM driver

Claims (1)

A seat cushion attached to the vehicle body,
A seat back that is tiltably attached to the seat cushion;
A reclining device for adjusting an inclination angle of the seat back with respect to the seat cushion;
A tilt return mechanism that operates the reclining device to tilt and return the seat back;
A vehicle seat comprising a control device for controlling the drive of the tilt return mechanism,
Storage means for storing an inclination angle of the seat back in the control device;
A vehicle seat, comprising: a discriminating unit that discriminates whether or not the seat back that is to be returned by the tilt return mechanism has reached an inclination angle stored in the storage unit.

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