WO2012124381A1

WO2012124381A1 - Vehicle seat

Info

Publication number: WO2012124381A1
Application number: PCT/JP2012/051714
Authority: WO
Inventors: 中村　武; 信一堀端
Original assignee: 日本発條株式会社
Priority date: 2011-03-14
Filing date: 2012-01-26
Publication date: 2012-09-20
Also published as: JP2012188084A; JP5684008B2

Abstract

Provided is a vehicle seat capable of preventing acceleration in tilt speed of a seat back when the seat back tilts forward. A rear seat (10), as illustrated in figure 1, wherein if a lock-release lever (40) of a reclining mechanism is operated by an occupant while a seat back (14) is placed in a usage position, and a sector gear (60) of a return mechanism (58) is placed in a standby position, then a seat back (14) lock provided by a locking mechanism is released. As a result, the seat back (14) begins to tilt towards a forward tilted position due to the pressing force of a spiral spring; however, during this time a control circuit of the return mechanism (58) brings a protruding part (54) of the seat back (14) into contact with a contact part (84) of the sector gear (60), and while doing so rotates the sector gear (60) to a return preparation position. As a result, the seat back (14) slowly tilts at a speed corresponding to the rotation speed of the sector gear (60).

Description

Vehicle seat

The present invention relates to a vehicle seat, and more particularly, to a vehicle seat provided with a return mechanism for returning a seat back from a forward-turning position to a use position.

In the seat device shown in Patent Document 1 below, the lock of the lock mechanism provided in the reclining device is released, so that the seat back is moved from the use position (standup position) to the forward tilt position by the biasing force of the spiral spring. Be inclined. On the other hand, when the seat back is raised from the forward tilt position to the use position, the seat back is driven by the rotating device (return mechanism). The rotating device rotates the sector gear by a motor, and brings the notch portion provided in the sector gear into contact with the convex portion provided on the seat back side to return the seat back to the use position. When the seat back is locked by the lock mechanism at the use position, the sector gear is rotated to the original position, and the notch portion of the sector gear is separated from the convex portion of the seat back. Thereby, when the lock mechanism is unlocked again, the seat back is allowed to tilt from the use position to the forward tilt position.

JP 2007-7386 A

However, in the seat apparatus as described above, when the seat back is moved forward, the seat back is accelerated by its own weight in addition to the urging force of the spiral spring. As a result, the tilting speed when the seat back is tilted forward is increased.

The present invention has been made in view of the above facts, and an object of the present invention is to obtain a vehicle seat that can prevent the tilting speed of the seat back from increasing when the seat back is moved forward.

The vehicle seat according to the first aspect of the present invention is connected to a seat cushion attached to a vehicle body side so as to be tiltable between a use position and a forward-falling position with respect to the seat cushion, and the forward-falling position. The seat back biased toward the seat, the seat back locked in the tilted position at the use position, and the lock mechanism capable of releasing the lock, the motor, and the return preparation position and the return completion by the motor A rotating member that is rotated between the position, the seat back is disposed at the forwardly tilted position, and the rotating member is disposed at the return preparation position, and the rotating member is moved to the return completion position. By rotating, the contact portion provided on the rotating member is brought into contact with the contacted portion provided on the seat back to bring the seat back to the use position. And a return mechanism that rotates the rotating member to the return preparation position while bringing the contacted portion of the seat back into contact with the contact portion when the lock is released. ing.

In the first aspect, when the return mechanism rotates the rotating member to the return completion position by the motor in a state where the seat back is arranged at the forward tilt position and the rotation member of the return mechanism is arranged at the return preparation position, the rotation is performed. The contact portion provided on the member contacts the contacted portion provided on the seat back, and the seat back is returned to the use position. When the seat back reaches the use position, the seat back is locked so as not to be tilted by the lock mechanism. As a result, the seat back can be automatically returned from the forward tilt position to the use position.

On the other hand, when the lock mechanism is unlocked, the seat back biased toward the forward tilt position starts to tilt toward the forward tilt position. The rotating member is rotated to the return preparation position while contacting the abutting portion of the rotating member. As a result, the seat back tilts at a speed corresponding to the rotational speed of the rotating member, so that the tilt speed of the seat back can be prevented from increasing.

The vehicle seat according to a second aspect of the present invention is the vehicle seat according to the first aspect, wherein the return mechanism rotates the rotary member to the return completion position, and then moves the rotary member to the return preparation position and the return. By rotating to a standby position between the completion position and separating the contact portion from the contacted portion, the lock is released and the seat back is tilted to the forward tilt position side. The abutted portion abuts on the abutting portion.

In the second aspect, the return mechanism returns the rotary member after rotating the rotary member to the return completion position, that is, after the seat back is returned from the forward-turned position to the use position and locked by the lock mechanism. Rotate to a standby position between the preparation position and the return completion position. Thereby, the contact portion of the rotating member is separated from the contacted portion of the seat back. After that, when the lock of the lock mechanism is released and the seat back is tilted to the forward tilt position side by the biasing force, the contacted portion of the seat back comes into contact with the contact portion of the rotating member. In this contact state, the return mechanism rotates the rotary member to the return preparation position, so that the seat back tilts at a speed corresponding to the rotation speed of the rotary member.

Here, in this aspect, after the seat back is locked at the use position as described above, the rotation member is rotated to the standby position between the return preparation position and the return completion position, thereby The contact portion is separated from the contacted portion of the seat back (the engagement between the seat back and the rotating member is released). As a result, the reliability of the lock mechanism is not impaired because the lock can be reliably re-locked even after the lock is once released due to variations in the lock position when the seat back is locked at the use position. Further, since it is possible to prevent a load on the return mechanism, the durability of the return mechanism can be improved.

The vehicle seat according to a third aspect of the present invention is the vehicle seat according to the second aspect, wherein the standby position of the rotating member is set such that the seat back is located between the use position and the forward tilt position with respect to the seat cushion. By tilting toward the forward tilt position side rather than the upright position, the contacted portion is set to a position where it comes into contact with the contact portion.

In the third aspect, when the seat back biased toward the forward tilt position tilts to the forward tilt position side rather than the position standing upright with respect to the seat cushion between the use position and the forward tilt position, Although the seat back starts to accelerate, the acceleration described above is caused by the contact between the contact portion of the rotating member that starts to rotate from the standby position toward the return preparation position and the contact portion of the seat back substantially simultaneously. Be blocked. As described above, since the standby position of the rotating member is set to the forward leaning position side of the upright position, which is the range in which the acceleration of the seat back should be prevented, the initial speed of the tilting of the seat back is unnecessary by the rotating member. It is suitable without being limited.

The vehicle seat according to a fourth aspect of the present invention is the vehicle seat according to any one of the first to third aspects, wherein the return mechanism rotates the rotary member to the return preparation position. Before the seat back reaches the forward tilt position, power supply to the motor is controlled to reduce the rotational speed of the rotating member.

In the fourth aspect, when the return mechanism rotates the rotating member to the return preparation position, that is, when the seat back is tilted to the forward tilt position, before the seat back reaches the forward tilt position, The power supply to the motor is controlled to reduce the rotation speed of the rotating member. Thereby, the tilting speed of the seat back when the seat back reaches the forward tilt position can be effectively reduced. In other words, while the seat back tilting speed when the seat back reaches the forward tilt position is decreased, the seat back tilt speed (that is, the rotational speed of the rotating member) until immediately before the seat back reaches the forward tilt position. Can be set high. Therefore, the seat back can be quickly moved forward.

The vehicle seat according to a fifth aspect of the present invention is the vehicle seat according to any one of the first to fourth aspects, wherein when the rotating member is rotated to the return preparation position, the seat back is A relative tilt toward the use position side with respect to the rotating member is allowed.

In the fifth aspect, when the rotating member is rotated to the return preparation position, that is, when the seat back is rotated together with the rotating member toward the forward tilted position, the seat back is relative to the use position side with respect to the rotating member. Tilting is allowed. For this reason, even if an object or the like is sandwiched between the seat back and the seat cushion, the object or the like can be prevented from being crushed by the driving force of the motor.

As described above, the vehicle seat according to the present invention can prevent the tilting speed of the seat back from increasing when the seat back is moved forward.

FIG. 3 is a side view showing a configuration of a main part of the rear seat according to the embodiment of the present invention, in a state where the seat back is arranged at the use position and the sector gear is arranged at the standby position. FIG. 2 is a side view showing a state in which, in the rear seat shown in FIG. 1, the seat back is tilted toward a forward tilt position and a sector gear is rotated toward a return preparation position. FIG. 2 is a side view showing a state in which the seat back is arranged at a forward tilt position and the sector gear is arranged at a return preparation position in the rear seat shown in FIG. 1. FIG. 2 is a side view showing a state in which the seat back is arranged at the use position and the sector gear is arranged at the return completion position in the rear seat shown in FIG. 1. It is a disassembled perspective view which shows the structure of the peripheral member containing the seat back frame in the rear seat shown by FIG.

Hereinafter, a rear seat 10 as a vehicle seat according to an embodiment of the present invention will be described with reference to FIGS. 1 to 5. In addition, arrow FR, arrow UP, and arrow W that are appropriately shown in the drawings indicate the front direction, the upper direction, and the width direction of the rear seat 10, respectively.

1 to 4, the rear seat 10 according to the present embodiment includes a seat cushion 12 and a seat back 14. The seat back 14 is connected to the vehicle body on the rear end side of the seat cushion 12.

As shown in FIG. 5, the seat back frame 16 constituting the skeleton of the seat back 14 is fixed to the frame main body 22 formed in a substantially rectangular frame shape in a front view, and to both side portions on the lower end side of the frame main body 22. And a pair of left and

right side portions

18 and 20. The

side portions

18 and 20 are made of a sheet metal material, and the frame main body 22 is made of a pipe material.

A seat back side bracket 52 constituting a part of the seat back frame 16 is fixed to the outer side surface in the seat width direction on the lower end side of the side portion 20. The seat back side bracket 52 is rotatably connected to an upper end portion of a base plate 62 fastened and fixed to the floor portion of the vehicle body via a support shaft 80. Thus, the seat left side of the seat back frame 16 is rotatably connected to the vehicle body floor via the support shaft 80 and the base plate 62.

The lower end portion of the side portion 18 is connected to a seat cushion side bracket 26 on the right side of the seat via a reclining mechanism 24. The seat cushion side bracket 26 is paired with a seat cushion side bracket 28 on the left side of the seat, and rear end portions (upper end portions) of the seat

cushion side brackets

26 and 28 are seat widths by a connecting member 29. Linked in the direction. The seat

cushion side brackets

26 and 28 are fastened and fixed to the floor portion of the vehicle body, and the seat cushion 12 (not shown in FIG. 5) is attached to the upper side of the seat

cushion side brackets

26 and 28. Yes.

The above-described reclining mechanism 24 is a conventional one that has been conventionally used, and includes a recliner 32 disposed between the lower end portion of the side portion 18 and the seat cushion side bracket 26.

The recliner 32 (recliner mechanism 24) is capable of adjusting and tilting (turning) the tilt angle of the seat back 14 with respect to the seat cushion 12 (not shown). 1 and 4 between the use position shown in FIG. 4 and the forward tilt position shown in FIG. 3, and between the use position and a rear fall position (not shown) set behind the use position. It is possible. In the use position, the seat back 14 is substantially upright with respect to the seat cushion 12. In the forward tilt position, the seat back 14 overlaps the upper side of the seat cushion 12 substantially in parallel. Thereby, the back surface of the seat back 14 can be used as a table, or can be used as a part of a luggage compartment. Further, in the rearward tilt position, the seat back 14 reclines to the rear side with respect to the seat cushion 12. Thereby, a passenger | crew can take an easy posture.

The recliner 32 is provided with a well-known lock mechanism 38, and the seat back 14 is locked (restrained) by the lock mechanism 38 so as not to tilt when the seat back 14 is disposed at the use position. A lock release lever 40 is connected to the lock mechanism 38 via a connecting shaft 37 that penetrates the shaft 36 and the shaft center portion of the support shaft 80. The lock release lever 40 is disposed on the outer side in the seat width direction with respect to the base plate 62 described above. When the lock release lever 40 is operated, the lock of the seat back 14 by the lock mechanism 38 is released. Thus, the seat back 14 can be tilted from the use position to the forward tilt position, and the tilt angle of the seat back 14 can be adjusted in multiple stages between the use position and the rear tilt position. 1 to 4 show only a part of the lock release lever 40 for convenience of explanation.

The above-described lock release lever 40 is always urged in a direction to lock the lock mechanism 38 by the urging spring 41 spanned between the base plate 62 and when the occupant releases the lock release lever 40, the lock mechanism 40 38 becomes a locked state, and the seat back 14 is restrained at an arbitrary position (angle) between the use position and the rearward tilt position. However, in a state where the seat back 14 is tilted forward from the use position, the state in which the lock by the lock mechanism 38 is released is maintained.

Further, the above-described seat back 14 is biased toward the forward-down position by the biasing force of the pair of left and right spiral springs 42 disposed between the side portion 18 of the seat back frame 16 and the seat cushion side bracket 26. Yes. For this reason, when the lock release lever 40 is operated in a state where the seat back 14 is disposed (restrained) at the use position or the rearward tilt position side of the use position, the seat back 14 is moved forward by the urging force of the spiral spring 42. Tilt to the fall position side.

Furthermore, an arm portion 46 is formed on the rear end side of the lock release lever 40. The arm portion 46 corresponds to a first limit switch 48 disposed on the rear side of the seat with respect to the arm portion 46. The first limit switch 48 is attached to an attachment bracket 50 fixed to the base plate 62, and engages with the arm portion 46 when the lock mechanism 38 is locked. Thereby, the 1st limit switch 48 will be in an ON state.

Furthermore, the above-described seat back side bracket 52 is provided with a convex portion 54 (contacted portion) that protrudes inward in the seat width direction. The convex portion 54 corresponds to the sector gear 60 provided in the return mechanism 58.

The return mechanism 58 is a device for automatically returning the seat back 14 from the forward-turned position to the use position, and the holding bracket 64 attached to the base plate 62 (see FIG. 5; see FIGS. 1 to 4). (Not shown). The holding bracket 64 is disposed on the inner side in the seat width direction with respect to the base plate 62, and a second limit switch 56 is attached to the upper end portion of the holding bracket 64. The second limit switch 56 corresponds to the sector gear 60. A motor unit 66 is disposed on the inner side in the seat width direction than the holding bracket 64. The motor unit 66 includes a motor 68 and a gear box 70, and the gear box 70 is fixed to the holding bracket 64 with bolts.

The output shaft 72 of the motor unit 66 extends outward in the seat width direction from the gear box 70 and penetrates the holding bracket 64. A motor gear 74 disposed between the holding bracket 64 and the base plate 62 is fixed to the distal end side of the output shaft 72. The motor gear 74 meshes with the transmission gear 76, and the transmission gear 76 meshes with the reduction gear 78. The transmission gear 76 and the reduction gear 78 are rotatably supported by the holding bracket 64 and the base plate 62.

Furthermore, a small-diameter gear (not shown) is coaxially and integrally provided on the inner side in the seat width direction of the reduction gear 78, and this small-diameter gear meshes with a sector gear 60 as a rotating member. The sector gear 60 is rotatably supported by the support shaft 80 described above. The support shaft 80 is disposed coaxially with the recliner 32, and the sector gear 60 is disposed coaxially with the tilt center (rotation center) of the seat back 14 with respect to the seat cushion 12. The arrangement of the seat back side bracket 52 and the base plate 62 in the seat width direction with respect to the sector gear 60, the motor gear 74, the transmission gear 76, and the reduction gear 78 is as shown in FIG. 5, but for convenience of explanation in FIGS. The sector gear 60, the motor gear 74, the transmission gear 76, and the reduction gear 78 are shown on the front side of the seat back side bracket 52 and the base plate 62.

The above-described sector gear 60 transmits the rotational force of the motor unit 66 through the motor gear 74, the transmission gear 76, the reduction gear 78, and a small-diameter gear (not shown), so that the return preparation position shown in FIG. It is rotated between the return completion position. The return preparation position corresponds to the forward tilt position of the seat back 14, and the return completion position corresponds to the use position of the seat back 14. The return preparation position and the return completion position are positions separated by a predetermined rotation stroke in the rotation direction of the sector gear 60.

The sector gear 60 is provided with a notch portion 82, and the notch portion 82 is configured to engage with the convex portion 54 of the seat back side bracket 52 described above. That is, the convex portion 54 of the seat back side bracket 52 is disposed inside the notch portion 82 of the sector gear 60 and is located within the rotation locus of the abutting portion 84 that is one end of the notch portion 82.

Furthermore, the sector gear 60 is provided with an engaging protrusion 86. The engagement protrusion 86 engages with the second limit switch 56 in a state (the state shown in FIG. 3) in which the seat back 14 is disposed at the forward tilt position and the sector gear 60 is disposed at the return preparation position. As a result, the second limit switch 56 is turned on. Thus, in a state where the engaging projection 86 is engaged with the second limit switch 56, the contact portion 84 of the sector gear 60 is disposed so as to be separated from the convex portion 54 of the seat back side bracket 52 by a predetermined distance. It has become.

The above-described standby position (position shown in FIG. 1) in the sector gear 60 is set near the return completion position. Specifically, this standby position is slightly tilted to the front tilt position side from the position where the seat back 14 stands upright with respect to the seat cushion 12 (hereinafter referred to as the upright position) between the use position and the front tilt position. Thus, the convex portion 54 is set to a position where it comes into contact with the contact portion 84, and is set closer to the return completion position than the intermediate position between the return preparation position and the return completion position.

Here, the second limit switch 56 and the first limit switch 48 described above are electrically connected to a control circuit (not shown) constituting the return mechanism 58. The control circuit is electrically connected to a motor 68 of a motor unit 66 and is electrically connected to an operation switch (not shown). The operation switch is disposed, for example, in the vicinity of the driver's seat of the vehicle. The control circuit is configured to operate the motor 68 based on the ON / OFF states of the operation switch, the first limit switch 48, and the second limit switch 56. It is the composition which controls the operation of.

Specifically, as shown in FIG. 1, when the unlocking lever 40 of the reclining mechanism 24 is operated in a state where the seat back 14 is disposed at the use position and the sector gear 60 is disposed at the standby position, The back 14 begins to tilt toward the forward tilt position by the urging force of the spiral spring 42 (see arrow A in FIG. 2). At this time, as shown in FIG. 2, the arm portion 46 of the lock release lever 40 is separated from the first limit switch 48, and the first limit switch 48 is turned OFF. Thereby, the control circuit rotates the sector gear 60 to the return preparation position by rotating the motor 68 in the forward direction (see arrow B in FIG. 2). In this case, the rotational speed of the sector gear 60 is constant, and is set sufficiently slower than the tilting speed of the seat back 14 by the urging force of the spiral spring 42. For this reason, the convex part 54 of the seat back side bracket 52 contacts the contact part 84 of the sector gear 60 while the sector gear 60 is rotating toward the return preparation position (see FIG. 2). Thus, after the convex portion 54 comes into contact with the contact portion 84, the seat back 14 slowly rotates (tilts) together with the sector gear 60.

When the seat back 14 reaches the forward tilt position shown in FIG. 3, a stopper (not shown) provided on the seat cushion 12 side contacts the seat back 14, and the seat back 14 is held at the forward tilt position by the stopper. The On the other hand, the sector gear 60 further rotates toward the return preparation position. Thereby, the contact part 84 of the sector gear 60 is separated from the convex part 54 of the seat back side bracket 52. When the sector gear 60 reaches the return preparation position shown in FIG. 3, the engagement protrusion 86 of the sector gear 60 engages with the second limit switch 56. Thus, when the second limit switch 56 is turned on, the control circuit cuts off the power supply to the motor 68 and stops the motor 68, that is, the sector gear 60. Thereby, the forward movement of the seat back 14 is completed.

On the other hand, when the operation switch connected to the control circuit is operated by the occupant in the state shown in FIG. 3, the control circuit rotates the sector gear 60 to the return completion position by rotating the motor 68 in the reverse direction. (See arrow C in FIG. 4). Thus, when the contact portion 84 of the sector gear 60 contacts the convex portion 54 of the seat back side bracket 52, the seat back 14 rotates (returns) together with the sector gear 60 toward the use position (see arrow D in FIG. 4). ). As shown in FIG. 4, when the sector gear 60 reaches the return completion position and the seat back 14 reaches the use position, the lock mechanism 38 of the reclining mechanism 24 locks the seat back 14 so that it cannot tilt.

At this time, the arm portion 46 of the lock release lever 40 is engaged with the first limit switch 48, and the first limit switch 48 is turned on. When the first limit switch 48 is turned on, the control circuit rotates the sector gear 60 to the standby position by reversing the rotation direction of the motor 68 from the reverse direction to the forward direction. When the control circuit is reversed by a certain angle, the control circuit cuts off the power supply to the motor 68 and stops the motor 68, that is, the sector gear 60. Note that the control circuit detects, for example, an elapsed time since the rotation direction of the motor 68 is reversed with a timer, and cuts off the power supply to the motor 68 when the elapsed time reaches a preset time. Alternatively, the control circuit determines the timing at which power supply to the motor 68 is cut off by detecting the angle of the sector gear 60 using a sensor.

Next, functions and effects of this embodiment will be described.

In the rear seat 10 having the above-described configuration, as shown in FIG. 1, the lock release lever 40 of the reclining mechanism 24 is in the state where the seat back 14 is disposed at the use position and the sector gear 60 of the return mechanism 58 is disposed at the standby position. When operated by the occupant, the lock of the seat back 14 by the lock mechanism 38 is released. As a result, the seat back 14 starts to tilt toward the forward tilt position by the urging force of the spiral spring 42, but the convex portion 54 of the seat back 14 comes into contact with the contact portion 84 of the sector gear 60, thereby Tilt speed decreases.

At this time, the control circuit of the return mechanism 58 rotates the sector gear 60 to the return preparation position while bringing the convex portion 54 of the seat back 14 into contact with the contact portion 84 of the sector gear 60. As a result, the seat back 14 slowly tilts toward the forward tilt position at a constant speed according to the rotational speed of the sector gear 60, so that the tilt speed of the seat back 14 can be prevented from becoming too fast. Therefore, it can reduce or prevent giving a passenger a sense of harm. In addition, since the contact sound (impact sound) when the seatback 14 hits a stopper (not shown) in the forward-turned position can be reduced, it is possible to reduce or prevent the sense of quality from being impaired.

In addition, the seat back 14 that tilts together with the sector gear 60 toward the forward-tilt position only has the convex portion 54 abutted against the abutting portion 84 of the sector gear 60 by the urging force and its own weight of the spiral spring 42. Relative tilting toward the use position side is allowed. Therefore, even if an object or the like is sandwiched between the seat back 14 and the seat cushion 12, the object or the like can be prevented from being crushed by the driving force of the motor 68. That is, as a measure for making the tilting speed when the seatback 14 tilts forward, a configuration (so-called power seat structure) in which the seatback 14 is directly driven by a motor via a gear or the like can be considered. In this case, an object sandwiched between the seat back 14 and the seat cushion 12 is crushed by the driving force of the motor. In this respect, in the present rear seat 10, since the force that the object is sandwiched between the seat back 14 and the seat cushion 12 is only the urging force of the spiral spring 42 and the weight of the seat back 14, the object is crushed. Can be avoided and is safe.

Further, in the rear seat 10, when the sector gear 60 is disposed at the standby position (shown in FIG. 1), the contact portion 84 of the sector gear 60 is disposed away from the convex portion 54 of the seat back 14 (seat back). 14 and the sector gear 60 are disengaged). As a result, due to variations in the lock position when the seatback 14 is locked by the lock mechanism 38 in the use position, the lock mechanism can be reliably re-locked even after the lock is once released, thereby impairing the reliability of the lock mechanism. There is no. Further, since the load from the occupant during use of the seat back 14 can be prevented from being applied to the return mechanism 58 via the sector gear 60, the durability of the return mechanism 58 can be improved.

Further, in the rear seat 10, the standby position of the sector gear 60 is such that the seat back 14 slightly tilts from the upright position to the forward tilt position side by the urging force of the spiral spring 42, so that the convex portion 54 of the seat back 14 is 60 is a position where it abuts against the abutment portion 84. That is, when the seat back 14 tilts to the forward tilt position side from the upright position, the seat back 14 starts to accelerate due to its own weight, but at the same time, the convex portion 54 of the seat back 14 contacts the contact portion 84 of the sector gear 60. By contacting, acceleration of the seat back 14 is prevented. As described above, since the standby position of the sector gear 60 is set to the forward tilt position side of the upright position that is the range in which the acceleration of the seat back 14 should be prevented, the initial speed of the tilt of the seat back 14 is not controlled by the sector gear 60. It is suitable without being limited to necessity.

In the above-described embodiment, the standby position of the sector gear 60 is set in the vicinity of the return completion position. However, the invention according to claims 1 and 2 is not limited thereto, and the standby position of the sector gear 60 is If the convex portion 54 is in a position where it comes into contact with the contact portion 84 of the sector gear 60 when the seat back 14 is tilted forward, the setting can be appropriately changed between the return completion position and the return preparation position.

In the above embodiment, the control circuit of the return mechanism 58 rotates the sector gear 60 to the return completion position, and then rotates the sector gear 60 to the standby position to separate the contact portion 84 from the convex portion 54. However, the invention according to claim 1 is not limited to this, and the configuration in which the rotation of the sector gear 60 to the standby position is omitted, that is, the abutment portion 84 is changed to the convex portion 54 at the return completion position of the sector gear 60. You may make it the structure which waits with making it contact | abut.

In the above embodiment, when the arm portion 46 of the lock release lever 40 is separated from the first limit switch 48 and the first limit switch 48 is turned off, the control circuit of the return mechanism 58 rotates the motor 68 in the forward direction. The sector gear 60 is rotated from the standby position to the return preparation position. However, the invention according to claims 1 to 5 is not limited thereto, and the control circuit of the return device 58 rotates the motor 68 in the forward direction. The timing can be appropriately changed.

In the above embodiment, the lock mechanism 38 is unlocked by directly operating the lock release lever 40 by the occupant. However, the inventions according to claims 1 to 5 are not limited thereto, and the seat is not limited thereto. An operation member may be provided on the upper portion of the back 14, and the operation member and the lock release lever 40 may be connected by a wire or the like so that the lock release lever 40 can be operated by operating the operation member.

In the above embodiment, the occupant manually operates the lock release lever 40 of the reclining mechanism 24. However, the invention according to claims 1 to 5 is not limited thereto, and the lock release lever 40 is driven. An actuator may be provided, a switch for operating the actuator may be set near the driver's seat, and the lock mechanism 38 may be automatically (electrically) unlocked by operating the switch. In this case, for example, the control circuit of the return mechanism 58 receives the input of the electric release signal or the like and rotates the sector gear 60 from the standby position to the return preparation position.

Furthermore, in the above embodiment, the rotational speed of the motor 68 is set to be constant. However, in the invention according to claim 4, the control circuit of the return mechanism 58 changes the rotational speed of the motor 68. Also good. Specifically, when the control circuit of the return mechanism 58 rotates the sector gear 60 to the return preparation position, that is, when the seat back 14 is tilted to the forward tilt position, the seat back 14 reaches the forward tilt position. Immediately before, the rotational speed of the motor 68 (that is, the rotational speed of the sector gear 60) may be decreased. In this case, the timing at which the rotational speed of the motor 68 is decreased is determined by detecting the time from the start of power supply to the motor 68 by a timer circuit or by detecting that the seatback 14 has approached the forward tilt position by a sensor or the like. Can be set. With such a configuration, it is possible to effectively reduce the tilting speed of the seat back 14 when the seat back 14 reaches the forward tilt position. In other words, the tilting speed of the seat back 14 immediately before the seat back 14 reaches the forward tilted position (that is, the sector gear 60) while reducing the tilting speed of the seat back 14 when the seat back 14 reaches the forward tilted position. Can be set high. As a result, the seat back 14 can be quickly moved forward.

Further, in the above embodiment, the case where the present invention is applied to the rear seat 10 of the vehicle has been described. However, the inventions according to claims 1 to 5 are not limited to this, but also to the front seat of the vehicle. Can be applied.

In the above embodiment, the locking mechanism 38 of the seat back 14 is provided in the reclining mechanism 24. However, the inventions according to claims 1 to 5 are not limited to this, and are separate from the reclining mechanism. A simple seat back locking mechanism may be employed.

In addition, the present invention can be implemented with various modifications without departing from the scope of the invention. Needless to say, the scope of rights of the present invention is not limited to the above embodiment.

Claims

A seat cushion attached to the vehicle body,
The seat back is connected to the seat cushion so as to be tiltable between a use position and a forward tilt position, and is urged toward the forward tilt position,
A lock mechanism that locks the seat back at the use position so as not to tilt, and allows the lock to be released;
A motor and a rotating member that is rotated between a return preparation position and a return completion position by the motor, wherein the seat back is disposed at the forward tilt position and the rotating member is disposed at the return preparation position Then, by rotating the rotating member to the return completion position, the contact portion provided on the rotating member is brought into contact with the contacted portion provided on the seat back to bring the seat back to the use position. And a return mechanism for rotating the rotating member to the return preparation position while bringing the contacted portion of the seat back into contact with the contact portion when the lock is released,
Vehicle seat equipped with
The return mechanism rotates the rotary member to the return completion position, and then rotates the rotary member to a standby position between the return preparation position and the return completion position, thereby moving the contact portion to the standby position. 2. The contacted part comes into contact with the contacted part by separating from the contacted part and then releasing the lock and tilting the seat back toward the forward tilt position side. Vehicle seat.
The standby position of the rotating member is such that the seat back is tilted toward the front-falling position side than the position where the seat back stands upright with respect to the seat cushion between the use position and the front-falling position. The vehicle seat according to claim 2, wherein the contact portion is a position where the contact portion contacts the contact portion.
When the return mechanism rotates the rotation member to the return preparation position, the rotation mechanism controls the power supply to the motor before the seat back reaches the forward tilt position. The vehicle seat according to any one of claims 1 to 3, wherein the vehicle seat is lowered.
5. The method according to claim 1, wherein when the rotating member is rotated to the return preparation position, the seat back is allowed to be tilted relative to the rotating position with respect to the rotating member. The vehicle seat according to Item.