JP2020152159A - Vehicle seat device - Google Patents

Abstract

To provide a vehicle seat device which restricts tilting of a folded seat back to improve safety during a collision.SOLUTION: A vehicle seat device has: a seat cushion 3 supported by a vehicle body; a seat back support part 10 disposed at a rear part of the seat cushion 3 and fixed to the vehicle body; and a seat back 2 which is supported in a tiltable manner by the seat back support part 10 and can be brought down to the vehicle front side to be in a fold state where the seat back 2 is folded above the seat cushion 3. The vehicle seat device includes: a lateral collision sensor 30 which detects a collision of a vehicle; and a control unit 31 and a lock mechanism 25 which restrict tilting of the seat back 2 in a case that a collision of the vehicle is detected by the lateral collision sensor 30 when the seat back 2 is in the fold state.SELECTED DRAWING: Figure 2

Description

The present invention relates to the structure of a vehicle seat device in which the seat back can be folded.

In the seat device provided in a vehicle such as an automobile, a seat back that can be folded forward is widely adopted. By folding the seat back forward, it becomes possible to load items such as luggage on the seat back.
Patent Document 1 discloses a technique in which a seat back can be folded forward in a vehicle seat device, and the seat device can be used as a table with the rear surface of the seat back substantially horizontal.

The seat device in which the seat back can be folded forward in this way is provided with a mechanism for preventing the occupant from falling further backward from the state in which the seat back is raised so that the occupant can sit. On the other hand, when the seat back is tilted forward to a substantially horizontal position, the seat back is often folded above the seat cushion and maintained in the tilted state by the weight of the seat back.

Further, Patent Document 1 discloses a device provided with a locking mechanism that locks the seat back in a state of being tilted forward.

JP-A-2002-67761

However, in recent years, seat backs equipped with side airbags have been used. The side airbag has a function of deploying the side airbag from the left and right sides of the seat back to the front of the vehicle while the occupant is seated on the seat device to suppress the occupant from moving in the left-right direction.
Therefore, if the side airbag is deployed with the seat back tilted forward, it will be deployed downward, so it may come into contact with the floor, seat cushion, etc. and cause the seat back to rise upward due to the reaction force. There is sex. At this time, if an article is placed on the upper surface of the seat back that is tilted forward, the article may scatter upward or backward.

Further, when the lock device is provided as in Patent Document 1, the lock device must be released when the seat back is caused, which causes a problem that the usability is lowered.
The present invention has been made to solve such a problem, and an object of the present invention is to provide a vehicle seat device that regulates tilting of a seat back in a folded state in a collision to improve safety. ..

In order to achieve the above object, the vehicle seat device of the present invention is arranged on the seat cushion supported by the vehicle body and the rear portion of the seat cushion, and is supported on the vehicle body and the support portion. A vehicle seat device that is tiltably supported and is capable of a folded state in which the seat back is tilted toward the front of the vehicle and folded above the seat cushion. A collision detector that detects a collision of the vehicle and the seat. It is characterized by including a tilt regulating unit that regulates the tilt of the seat back when the collision of the vehicle is detected by the collision detector when the back is in the folded state.

As a result, even if the vehicle collides while the seat back is in the folded state, the tilt of the seat back due to the impact, that is, the unintended raising of the seat is regulated.
Preferably, the tilt regulating unit comprises an inflator that operates when the collision of the vehicle is detected by the collision detector, and the seat back and the support that are in the folded state due to the operation of the inflator. It is preferable to have a locking portion for locking.
As a result, in the event of a vehicle collision, the inflator can quickly operate the locking portion to lock the seat back and the support portion, and prevent the seat back from rising.

Preferably, the locking portion may release the lock between the seat back and the support portion when the inflator is not activated.
As a result, in the normal state where the vehicle does not collide, the tilting of the seat back is not regulated by the tilt regulating unit, so that the seat back can be easily tilted manually and the usability of the seat can be improved. ..

Preferably, the seat back may include a side airbag that deploys from the side surface of the seat back when a collision from the side of the vehicle is detected by the collision detector.
As a result, when the side airbag is deployed due to a collision from the side of the vehicle while the seat back is in the folded state, the side airbag is deployed downward from the folded seat back to the floor. Even if a force that rises upward acts on the seat back due to contact with the vehicle, the tilt regulating unit can regulate the rise of the seat back.

According to the present invention, even if a vehicle collides while the seat back is in the folded state, the tilt of the seat back due to the impact is regulated. Therefore, for example, the passenger seat or the rear seat of the vehicle is placed in the folded state of the seat back. When the article is placed on the upper surface and traveled, it is possible to prevent the seat back from rising and scattering the article at the time of a collision. This makes it possible to improve safety when the vehicle is running.

It is a side view of the seat device of the vehicle which concerns on embodiment of this invention. It is a side view which shows the detailed structure of the support part of the seat back which concerns on this embodiment, and the structure of a control system.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
FIG. 1 is a side view of a vehicle seat device according to an embodiment of the present invention. FIG. 2 is a side view showing the detailed structure of the support portion of the seat back and the configuration of the control system. Note that FIGS. 1 and 2 show the seat device in the folded state.
As shown in FIG. 1, the vehicle seat device 1 to which the present invention is applied is a vehicle seat device capable of a folded state in which the seat back 2 is tilted toward the front side of the vehicle, such as a passenger seat or a rear seat of a vehicle. ..

The seat device 1 of the present embodiment includes a seat cushion 3 on which the occupant sits and a seat back 2 for supporting the back of the occupant.
The seat cushion 3 has a built-in seat cushion frame 5 as a strength member. The seat cushion frame 5 is fixed to the floor 6 (vehicle body) of the vehicle or slidably supported in the front-rear direction.

Seat back support portions 10 are provided at both ends of the rear portion of the seat cushion frame 5 in the vehicle width direction. The seat back support portion 10 is formed so as to stand upward at the rear portion of the seat cushion 3, and each of the rotating shafts 11 extending in the vehicle width direction (left-right direction) is provided above the seat back support portion 10. The upper end portion 10a of the seat back support portion is formed in a substantially semicircular arc shape centered on the rotation shaft 11.

The seat back 2 has a built-in seat back frame 12 as a strength member. The lower portion 12a of the seat back frame 12 is interposed between the left and right seat back support portions 10, and is tiltably supported by the seat back support portion 10 with the left and right rotation shafts 11 as the tilt centers.
Locking portions 13 formed by projecting a thick plate outward are provided on the side surfaces of the lower portions 12a of the left and right seat back frames 12, respectively. The locking portion 13 is located close to the arc-shaped upper end portion 10a of the seat back support portion 10 and outward in the radial direction thereof, and when the seat back 2 is rotated around the rotation shaft 11, the upper end portion 13 is located at the upper end portion. It is arranged so as to move along the portion 10a.

Further, contact portions 14a and 14b are formed at both ends of the upper end portion 10a of the seat back support portion 10 in the front-rear direction, respectively, with which the locking portions 13 abut. The contact portions 14a and 14b are provided on the front and rear portions of the upper end portions 10a of the left and right seat back support portions 10, respectively, and have a function of regulating the tilt angle of the seat back 2.
The seat back 2 can be tilted forward until it comes into contact with the upper surface of the seat cushion 3. In the folded state in which the seat back 2 is tilted forward, the seat back 2 is folded above the seat cushion 3, the back surface 15 of the seat back 2 becomes substantially horizontal, and the locking portion 13 is the front contact portion 14a. The movement of the seat back 2 further downward is restricted by abutting against.

On the other hand, in a normal state in which the seat back 2 is erected so that the occupant can sit on the seat cushion 3, the locking portion 13 abuts on the rear contact portion 14b and the seat back 2 tilts further backward. To regulate.
Further, side airbags 20 are built in the left and right sides of the seat back 2 or the side portions on the outer side in the width direction of the vehicle. The side airbag 20 includes an inflator 21 and an airbag bag body 22, and the airbag bag body 22 is inflated and deployed by the operation of the inflator 21. The side airbag 20 is deployed in the vertical direction from the side surface of the seat back 2. Specifically, when the seat back 2 is in a raised normal state, the side airbag 20 is deployed from the side surface of the seat back 2 toward the front of the vehicle.

As shown in FIG. 2, the seat device 1 of the present embodiment includes a lock mechanism 25 (locking portion) for locking the seat back 2 and the seat back support portion 10, and an inflator 26.
The inflator 26 is provided on the upper part of the seat back support portion 10.
The lock mechanism 25 is composed of a protruding portion 27 provided on the upper portion of the seat back support portion 10 and protruding by the operation of the inflator 26, and a locking portion 13.

When the inflator 26 is activated, the tip of the protrusion 27 protrudes radially outward from the arcuate upper end 10a of the seat back support portion 10, while when the inflator 26 is not activated, the tip of the protrusion 27 supports the seat back. It is configured so as not to protrude outward in the radial direction from the upper end portion 10a of the portion 10.
When the inflator 26 operates and the protruding portion 27 protrudes, the tip portion of the protruding portion 27 is arranged so as to protrude close to the rear side of the locking portion 13 of the seat back 2 in the folded state. By projecting the protruding portion 27 to the rear side of the locking portion 13 in this way, the protrusion 27 restricts the movement of the locking portion 13 to the rear side.

In addition, the vehicle is equipped with a side collision sensor 30 (collision detector) that detects a collision from the side. The side collision sensor 30 is, for example, a sensor that detects acceleration.
Further, the vehicle is provided with a control unit 31 that inputs a detection signal from the side collision sensor 30 and controls the operation of the inflator 21 and the inflator 26. When the control unit 31 detects a collision from the side, for example, when the side collision sensor 30 detects an acceleration equal to or higher than a predetermined value, the control unit 31 operates the inflator 21 to deploy the side airbag 20 and the inflator 26. It is operated to project the protruding portion 27 of the lock mechanism 25. The lock mechanism 25 and the control unit 31 correspond to the tilt control unit of the present invention.

With the above configuration, when the seat device 1 of the present embodiment detects a collision from the side and the protruding portion 27 of the locking mechanism 25 protrudes when the seat back 2 is in the folded state, the locking portion 13 The movement to the rear is restricted, and the tilting of the seat back 2 to the rear side, that is, the rising of the seat back 2 is restricted.
If the seat back 2 is in a folded state when it is laterally impacted, the side airbag 20 expands downward from the side surface of the seat back 2. Therefore, when the deployed side airbag 20 comes into contact with the seat cushion 3, the floor 6, or the like, the seat back 2 receives a reaction force that causes it to rise upward. Therefore, in the conventional seat device that does not have the lock mechanism 25, when an article is placed on the back surface 15 of the seat back 2 in the folded state that is tilted forward, when the seat back 2 rises due to a collision, the seat back 2 The article on the back surface 15 may be scattered upward or backward.

On the other hand, in the present embodiment, even if the side airbag 20 is deployed when the seat back 2 is in the folded state, the protruding portion 27 protrudes at the same time as the side airbag 20 is deployed and engages with the locking portion 13. It stops and the rearward tilt of the seat back 2 is restricted. Therefore, even if the article is placed on the back surface 15 of the seat back 2, it is possible to prevent the article from scattering, avoid harm to the occupant, and improve safety.

On the other hand, in a normal time when the vehicle does not collide, that is, when the inflator 26 is not operated, the protruding portion 27 does not protrude and the tilt of the seat back 2 is not regulated, so that the seat back 2 can be easily tilted as needed. Can be made to. Therefore, for example, in the seat device 1 of the present embodiment, the seat back 2 can be tilted without operating the lock mechanism, as compared with the seat device having a lock mechanism that manually locks the seat back 2 in the folded state. Therefore, usability can be improved.

The invention of the present application is not limited to the above embodiment. For example, the inflator 26 that operates the protrusion 27 may be another actuator such as an electric actuator. However, it is desirable to have an actuator with a high operating speed that operates faster than the seat back 2 rises in the event of a vehicle collision to project the protruding portion 27. Further, the configuration of the lock mechanism 25 that regulates the rising of the seat back 2 may be changed as appropriate.

Further, in the present invention, although the vehicle is provided with the side airbag 20, it may be applied to a vehicle not provided with the side airbag 20. Even if the side airbag 20 is not provided, for example, if the seat back 2 is in a folded state and is hit backwards, or if the rear part collides when moving backward, the seat back 2 tries to tilt backward. However, the tilting of the seat back 2 can be regulated by the lock mechanism 25 of the present embodiment.

Further, in the present embodiment, the side collision sensor 30 is used as a detector for detecting the collision to regulate the tilt of the seat back 2, but the detection signal from another collision sensor such as the rear collision sensor is used. The tilt of the seat back 2 may be regulated when a collision is detected.
The present invention can be widely applied to a vehicle seat device capable of a folded state in which the seat back is tilted toward the front side of the vehicle.

1 Seat device 2 Seat back 3 Seat cushion 10 Seat back support (support)
20 Side airbag 25 Lock mechanism (locking part, tilt regulation part)
26 Inflator 30 Side collision sensor (collision detector)
31 Control unit (tilt regulation unit)

Claims (4)

The seat cushion supported by the car body and
A support part placed at the rear of the seat cushion and supported by the vehicle body,
A vehicle seat device having a seat back 2 that is tiltably supported by the support portion and can be folded toward the front side of the vehicle and folded above the seat cushion.
A collision detector that detects a vehicle collision and
When the collision of the vehicle is detected by the collision detector when the seat back is in the folded state, the tilt regulating unit that regulates the tilt of the seat back
A vehicle seat device characterized by being equipped with. The tilt control unit
An inflator that operates when a collision of the vehicle is detected by the collision detector,
A locking portion that locks the seat back and the support portion in the folded state by the operation of the inflator, and
The vehicle seat device according to claim 1, wherein the vehicle has. The vehicle seat device according to claim 2, wherein the locking portion unlocks the seat back and the supporting portion when the inflator is not activated. The seat back is provided with a side airbag that deploys from the side surface of the seat back when a collision from the side of the vehicle is detected by the collision detector. The vehicle seat device according to any one of the following items.

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