JP2001122001A - Seat for vehicle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a seat for vehicle capable of lowering the pushing force from a seat back locally working to a body of an occupant when a rear-end collision happens. SOLUTION: When a vehicle is rear-end collided from behind, a waist part of an occupant 12 is moved toward seat back 18 by the inertia force so as to push the seat back 18. A pressure receiver member 20 receives this pushing force and moves rearward of the seat back 18. When the pressure receiver member 20 is moved, a seat side 24 is pulled by a steel wire and rotated around a seat side frame 22 in an arrow C direction. The waist part of the occupant 12 is thereby held from both side parts thereof. With this structure, rebound phenomenon of the occupant 12 is prevented, and the waist part of the occupant 12 is adhered to the seat back. As a result, the pushing force of the seat back 18 to be applied to the occupant 12 is applied to a neck part and the waist part of the occupant, and the pushing force to be applied locally to the neck part can be lowered in comparison with a case where the pushing force is applied to the only neck part.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vehicle seat disposed inside a vehicle such as an automobile.

[0002]

2. Description of the Related Art A vehicle seat provided inside a vehicle such as an automobile is provided with various devices for protecting occupants from a collision accident from the rear.

For example, as shown in FIG.
In JP-A-973, a headrest 104 is rotatably attached to a seatback frame 102 of a seatback 100 by a bracket 106. A U-shaped headrest support 108 is welded to the back of the bracket 106. A pressure receiving belt 110 is stretched between the headrest support 108 and the lower end of the seat back frame 102 (prior art 1).

According to this configuration, a rear-end collision (hereinafter, referred to as a rear-end collision) is performed.
It is called "back collision". ), The occupant is pressed against the seat back 100. This pressing force rotates the bracket 106 around the seat back frame 102 via the pressure receiving belt 110. By the rotation of the bracket 106, the headrest 104 is pushed forward,
Support the occupant's head. In this way, an attempt is made to prevent an occupant's neck injury occurring at the time of a rear collision.

[0005] Further, as shown in FIG.
In Japanese Patent No. 220991, the seat belt 122 is formed in a hollow belt shape. At the time of a rear collision, the impact force is
The air is sent to the inside of the seatbelt 122 by the gas filling device 126 and inflated (prior art 2). Thus, the occupant 128 is restrained and protected from whiplash or the like.

[0006]

The above prior arts have a structure in which a seat belt or a headrest is actuated for the purpose of reducing the impact force on the upper part of the body (particularly the neck) which is generated at the time of a rear collision. However, the behavior drawn by the occupant's upper body during a rear collision (hereinafter referred to as “occupant behavior”)
Is not taken into account, so that a sufficient effect cannot be obtained.

That is, in the above-mentioned prior art 1, the body of the occupant is not restrained when the rebound phenomenon occurs after the rear collision. For this reason, immediately after the rear collision, the occupant's waist moves in the direction of the seat back and presses the seat back.
The pressing force continuously acts from the seat back to the upper part of the body including the occupant's neck. Therefore, the pressing force acting on the neck of the occupant cannot be sufficiently reduced.

In the prior art 2, air is injected into the seat belt to inflate the seat belt and restrain the occupant. However, since the riding posture of the occupant is tilted forward, the whirling of the upper body relative to the lower body is promoted.

[0009] In a normal seat, a side surface of the seat is located forward of the vehicle with respect to a seat back surface. For this reason,
When the seatbelt is tightened, a certain gap is created between the occupant and the seatbelt, but if the seatbelt is greatly expanded to fill this gap, the compressive force acting on the abdomen of the occupant is further increased, which is preferable. Absent.

The present invention has been made in consideration of the above-described circumstances, and has as its object to provide a vehicle seat that can reduce a pressing force from a seat back that locally acts on an occupant's body during a rear collision.

[0011]

According to a first aspect of the present invention, there is provided a vehicle seat including a seat cushion and a seat back, wherein a waist of an occupant presses the seat back after a collision from behind the vehicle. A rebound phenomenon in which the occupant's waist is separated from the seat back by holding the occupant's waist from both sides while being actuated by the pressing force detecting means and the pressing force detecting means provided on the seat cushion or the seat back for detecting the force. And occupant holding means for preventing the occupant.

According to this configuration, when the vehicle is collided from behind, the occupant's waist moves toward the seat back due to the inertial force of the vehicle and presses the seat back. And
The pressing force detecting means detects the pressing force.

Next, the occupant holding means operates by detecting the pressing force by the pressing force detecting means, and holds both sides of the waist of the occupant. Thereby, the rebound phenomenon that the occupant's waist separates from the seat back can be prevented.

[0014] For this reason, the pressing force from the seat back acts on the waist of the occupant as a reaction of the pressing force, so that the pressing force is prevented from acting intensively only on the neck of the occupant. As a result, the pressing force acting on the neck can be dispersed, so that the neck can be protected.

[0015] The vehicle seat according to claim 2 is
The occupant holding means is connected to the pressing force detecting means and is rotatably provided around an axis provided on the seat cushion or the seat back. As the passenger moves rearward, the occupant holding means rotates around the axis and holds both sides of the occupant's waist.

According to this configuration, the pressing force detecting means moves to the rear of the seat back by the pressing force of the occupant. By the movement of the pressing force detecting means, the occupant holding means rotates around an axis provided on the seat cushion or the seat back, and holds both sides of the waist of the occupant. Therefore, it is possible to prevent the rebound phenomenon in which the occupant's waist moves away from the seat back with a simple configuration.

[0017]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A vehicle seat according to a first embodiment of the present invention will be described below with reference to the accompanying drawings. FIG. 1 is a plan view of the vehicle seat according to the embodiment, and FIG. 2 is a front view of the vehicle seat according to the embodiment.

As shown in FIGS. 1 and 2, the vehicle seat 10 is provided with a seat cushion 14 on which an occupant 12 sits. A gate-shaped seat back frame 16 is attached to the rear end of the seat cushion 14.

A seat back 18 for supporting the back 12A and the waist 12B of the occupant 12 is attached to the seat back frame 16. In the seat back 18, a spring and a cushion member which are wound around the seat back frame 16 are provided.

As shown in FIG. 3, the seat back 18
Is provided with a plate-shaped pressure receiving member 20 which moves rearward in the vehicle (in the direction of arrow A) by a pressing force of a predetermined value or more acting on the back 12A and the waist (not shown) of the occupant 12 at the time of a rear collision. I have. That is, in a normal state where no force is applied, the pressure receiving member 20 is located on the occupant 12 side of the seat back 18 by the elastic force of a spring (not shown). The spring is compressed and moves rearward of the seat back 18 (in the direction of arrow A in the figure). Alternatively, a separate holding member may be provided to hold the pressure receiving member 20 so as not to move during normal running, and the holding member may be deformed at the time of a rear collision so that the pressure receiving member 20 can be moved. The pressure receiving member 2 in the moved state
0 is indicated by a two-dot chain line in the figure.

On both sides of the seat back 18, rod-shaped seat side frames 22 are respectively mounted. These seat side frames 22 are disposed substantially parallel to the seat back frame 16, and upper and lower ends of the seat side frame 22 are fixed to the seat back frame 16 by attachment members (not shown). The seat side frame 22 is provided with a seat side 24 rotatably around the seat side frame 22.

As shown in FIG. 8, the front end of a steel wire 26 is attached as a connecting member to the surface of each seat side 24 on the occupant 12 side. On the other hand, the rear ends of the steel wires 26 are attached to both side surfaces of the pressure receiving member 20, respectively. For this reason, when the pressure receiving member 20 moves in the direction of arrow A, the seat side 24 interlocks and rotates around the seat side frame 22 toward the occupant 12 (in the direction of arrow C), and the occupant 1
In this case, both sides of the waist 2 are restrained.

For this reason, a part of the seat side 24 is large enough to hold the lumbar portion of the occupant 12 (preferably near the hipbone) sunk into the seat back 18 with the lumbar portion of the occupant 12 sandwiched between the occupant 12 and the seat back 18. It is preferable to arrange them. In FIG. 8, illustration of one seat side 24 is omitted for convenience of explanation.

As shown in FIG. 4, a plurality of protrusions 28 are formed on the outer periphery of the steel wire 26 on both sides of the axis. A plurality of these projections 28 project at predetermined intervals along the longitudinal direction of the steel wire 26.

As shown in FIG. 8, a steel wire fixing member 30 as a lock mechanism is disposed between the pressure receiving member 20 and the seat side 24. As shown in FIG. 4, the steel wire fixing member 30 is provided with a tubular portion 32 attached to the seat back frame 16 or the like. Inside the tubular portion 32, a claw member 38 is supported by the tubular portion 32 by a shaft 39. A wedge-shaped elastic member 36 is mounted between the claw member 38 and the inner periphery of the cylindrical portion 32. The claw member 38 is urged by the elastic member 36 to engage with the projection 28 of the steel wire 26. For this reason, the claw member 38 has a role as a blocking means for blocking the steel wire 26 from moving in the direction opposite to the entering direction (the direction of the arrow B in the drawing). It should be noted that instead of the protrusion 28, a protrusion of another shape or a large number of concave portions may be used. In addition, steel wire 26
Is not exposed to the seating space of the occupant 12,
It is preferable to embed in the seat back 18.

As shown in FIGS. 1 and 2, the head 12D of the occupant 12 is provided at the upper end of the seat back frame 16.
Is mounted.

Before describing the operation and effects of the present embodiment, the occupant 12 is mounted on the vehicle seat 10 of a running or stopped automobile in a general vehicle structure.
The upper body behavior of the occupant 12 (hereinafter, referred to as “occupant behavior”) when the vehicle is rear-collised (hereinafter, appropriately referred to as “rear collision”) with the vehicle seated will be described.

As shown in FIG. 5, in the early stage of the rear collision, the occupant 12 seated on the vehicle seat 10 is inclined forward, and a gap is formed between the neck 12C of the occupant 12 and the seat back 18. (The state at this time is indicated by a line X in the figure).

In the middle stage of the rear collision, the waist 12B and the back 12A of the occupant 12 move toward the seat back 18 due to the impact force at the time of the rear collision, and the gap between the neck 12C of the occupant 12 and the seat back 18 also decreases. (The state at this time is indicated by a line Y in the figure).

Further, in the latter half of the rear collision, the lumbar portion 12B of the occupant 12 moves largely in front of the vehicle seat 10 (the front side of the vehicle), and the back 12A rises from the seat back 18; Is in a state of being in close contact with the seat back 18 (the state at this time is indicated by a line Z in the figure).

Here, since the occupant 12 is in the forward leaning posture, the waist 12B of the occupant 12 moves toward the seat back 18 before the neck 12C. Therefore, the waist portion 12B receives a reaction force from the seat back 18 earlier than the neck portion 12C. Thereafter, the neck 12C moves toward the seat back 18 due to the inertial force and receives a reaction force from the seat back 18.

Here, the measurement results of the rotation angles of the neck 12C and the waist 12B of the occupant 12 at the time of a rear collision will be described. In this measurement, the neck 12C and the waist 12B of the occupant 12
And a sensor (not shown) is attached to each of them to measure each rotation angle.

That is, as shown in FIG. 6 (B), the rotation angle of the waist portion 12B of the occupant 12 after the rear impact changes once, but returns to a state close to that immediately before the collision again with the passage of time. On the other hand, as shown in FIG.
After the rotation angle of C once changes greatly, it does not return to the original state even after a lapse of time. As shown in the occupant behavior of FIG. 5, this phenomenon is caused by a rebound phenomenon in which the lower body such as the waist 12B moves forward of the seat back 18 with respect to the upper body including the neck 12C after the rear mid-collision.
This is because the lower part of the body rotates around the upper part of the body.

Here, the measurement result of the pressing force of the occupant 12 against the seat back 18 performed simultaneously with the measurement of the occupant behavior shown in FIG. 5 will be described. FIG. 7 shows (A) immediately after the collision (B)
The distribution of the amount of change in the pressing force on the waist 12B and the neck 12C of the occupant 12 based on the pressing force on the seat back 18 immediately before the rear collision is shown separately for the middle period of the collision (C) and the latter period of the collision. In addition, in FIG. 5 and FIG.
0 indicates an experimental result in the vehicle seat 10 not mounted.

As shown in FIG. 7, immediately after the collision, the waist 12B
Indicate that the change in the pressing force of the neck 12C is delayed with respect to the change in the waist 12B. Such a change in the pressing force matches the occupant behavior shown in FIG.

More specifically, as shown in FIG. 7A, the occupant 12 is in a forward leaning posture immediately after the collision, so that the occupant 1
The second waist 12B is pressed against the seat back 18 before the neck 12C. Therefore, only the pressing force (hatched portion in the figure) from the waist portion 12B acts on the seat back 18.

As shown in FIG. 7 (B), in the middle stage of the collision, the neck 12C of the occupant 12 has the
It is pressed against the seat back 18 later than 2B. At this time, the neck 12C of the occupant 12 is
A pressing force (hatched portion in the figure) acts from the waist portion 12B.

Further, as shown in FIG. 7C, after the late stage of the collision, when the rebound phenomenon that the waist portion 12B separates from the seat back 18 due to the reaction force from the seat back 18 starts, the waist portion 12B rises from the seat back 18. Therefore, the pressing force of the waist portion 12B against the seat back 18 does not act, but the pressing force of the neck portion 12C against the seat back 18 (hatched portion in the figure) is still acting.

FIG. 7 shows the seat back 18.
The reaction force of the same magnitude acts as a reaction from the seat back 18 on the neck 12C and the waist 12B.

From this point of view, even in the late stage of the collision, the reaction force on the neck 12C is greater than immediately after the collision, and after the rear collision, the reaction force from the seat back 18 continuously acts on the neck 12C. Will be.

Next, the vehicle seat 10 according to the present embodiment will be described.
The function and effect of the method will be described.

For example, if a car is hit while driving,
As shown in FIGS. 1 and 2, since the occupant 12 is in the forward leaning posture, the waist portion 12B and the back portion 12A first move in the direction of the seat back 18 (in the direction of arrow A) due to inertial force. Thereafter, the head 12D of the occupant 12 moves in the direction of the seat back 18 due to inertial force, and the head 12D and the neck 12C come into close contact with the headrest 40 and the seat back 18, respectively.

Then, the back portion 12A and the waist portion 12B push the pressure receiving member 20, and the pressing force causes the pressure receiving member 20 to move rearward of the seat back 18 (in the direction of arrow A in the drawing) against the spring force.

Here, as shown in FIGS. 3 and 8, the movement of the pressure receiving member 20 causes each seat side 24 to receive a tensile force via the steel wire 26, and
Around the occupant 12 (in the direction of arrow C in the figure). The steel wire 26 pulled by the pressure receiving member 20 has a protrusion 28
Pushes up the claw member 38 and pushes the cylindrical portion 32 of the steel wire fixing member 30.
And moves in the direction of arrow B in FIG. Then, when the movement of the pressure receiving member 20 stops at the maximum rearward movement position by hitting a stopper or the like, the rotation of the seat side 24 also stops at the maximum rotation position. In this state, the front end of the seat side 24 is located closer to the front of the vehicle than the waist of the occupant 12, so that
The occupant 12 is held between the seat side 24 and the seat back 18 and does not move forward of the vehicle. That is, the waist 12B, the back 12A, and the neck 12C of the occupant 12
The state comes into close contact with the seat back 18.

The occupant 12 is protected from the impact when the seat side 24 comes into contact with the lumbar portion 12B of the occupant 12 which is strong against impact. In this state, even if the steel wire 26 is pulled in the direction opposite to the arrow B direction, the tip of the claw member 38 of the belt fixing member 30 is
, The movement in the opposite direction is prevented.

Next, due to the rebound phenomenon, the waist portion 12B and the back portion 12A of the occupant 12 move away from the seat back 18 and move forward in a state where the neck portion 12C is in close contact with the seat back 18. However, since the seat side 24 holds the occupant 12, this rebound phenomenon is prevented, and the waist 12B and the back 12A
8 is always pressed. Therefore, in the late stage of the collision, the reaction force from the seat back 18 is reduced by the occupant 1
Back 12A and waist 12 as well as the neck 12C
Also acts on B.

As a result, the occupant 12 is seated on the seat back 18.
The pressure receiving area of the body that receives the reaction force from
The reaction force can be prevented from being concentrated on the neck 12C. That is, the reaction force acting on the neck 12C can be dispersed to the back 12A and the waist 12B, and the reaction force acting continuously on the neck 12C can be reduced, so that the neck 12C can be effectively protected.

Next, a vehicle seat according to a second embodiment of the present invention will be described with reference to FIGS.

The vehicle seat 50 of this embodiment uses a pressure receiving member 52 different from the pressure receiving member 20 of the first embodiment.
Further, a rotating roller 54 that rotates around the seat side frame 22 is provided in place of the steel wire fixing member 30 of the first embodiment. In addition, the same reference numerals are given to the other configurations, which are the same as the first embodiment, and the description will be appropriately omitted.

As shown in FIG. 9, as the pressure receiving member 52 used in the vehicle seat 50 of the present embodiment, a flexible member that can be easily elastically deformed, such as a wire and a resin belt, is used. For this reason, it can be easily incorporated into the seat back 18 and the assembling space can be reduced. Further, the pressure receiving member 52 may be a linear member or a plate member. In FIG. 9, illustration of one seat side 24 is omitted for convenience of explanation.

As shown in FIG. 10, both ends of the pressure receiving member 52 in the width direction of the seat back 18 are
And a part thereof is wound around the rotating roller 54. The rotating roller 54 is rotatably mounted inside the seat side 24 and on the outer periphery of the seat side frame 22.
And rotates around the seat side frame 22 together with the seat side 24.

The rotating direction of the rotating roller 54 is as follows.
It is restricted in a certain direction (arrow D direction) by a one-way clutch. Further, the moving direction of the pressure receiving member 52 is regulated by the plurality of guide members 56. In addition, a holding member (not shown) for preventing the rotation roller 54 from accidentally rotating during normal running may be separately provided.

According to the present embodiment, when a rear collision occurs, the pressing force from the occupant 12 to the pressure receiving member 52 causes a rotational force to act on the rotary roller 54 via the tensile force generated in the pressure receiving member 52. Then, the rotating roller 54 rotates in the direction of arrow D. That is, as shown in FIGS. 9 and 10, the pressure receiving member 52 moves in the direction of arrow A by the pressing force from the occupant 12, and the rotating roller 54 rotates to be drawn out in the direction of arrow E (two points in FIG. 9). (Indicated by dashed lines).

On the other hand, as shown in FIG.
4 rotates toward the occupant 12 (in the direction of arrow C) by the rotation of the rotation roller 54, and holds both sides of the waist of the occupant 12, as in the first embodiment. Thereby, the rebound phenomenon of the occupant 12 is prevented, and the back 12A, the waist 12B, and the neck 12C of the occupant 12 are pressed against the seat back 18. As a result, a reaction force also acts on the back 12A and the waist 12B from the seat back 18, so that
Concentration of the reaction force acting on the neck 12C can be prevented.

When the collision speed is high, the rebound amount of the occupant 12 increases, and the waist 12B of the seat side 24
There is a case where the occupant 12 cannot be sufficiently held only by the above-mentioned regulation. In such a case, if the seat side 24 is further disposed near the chest of the occupant, the occupant 12 can be effectively held.

At this time, the chest of the occupant 12 is also held. However, since the ribs are more vulnerable to impact than the hip of the waist 12B, the material of the seat side 24 is softer than that of the waist 12B. Or seat side 24
It is preferable to reduce the amount of rotation of itself. Thus, the chest (ribs) can be sufficiently protected.

Also, the vehicle seat 10 of the present invention is disposed in the rear seat, and the lumbar portion 12B of the occupant 12 in the rear seat at the time of a rear collision.
Can also reduce the impact on

That is, it has been found that an impact on the waist 12B of the occupant 12 in the rear seat at the time of a rear collision occurs. One of the causes is that the waist 12B shown in FIG. Various changes in the rotation angle are considered.

Here, the vehicle seats 10 and 50 of the present invention are provided.
Is disposed in the rear seat, the occupant 12 can be held and the rebound phenomenon can be prevented, so that a sudden change in the rotation angle of the waist 12B can be reduced, and the impact on the waist 12B can be reduced.

In each of the above embodiments, the case where the vehicle seats 10 and 50 are mounted on an automobile has been described. However, the present invention is not limited to this, and the present invention can be used in general vehicles.

Further, in each of the above-described embodiments, the form in which the seat side 24 is mechanically connected to the pressure receiving members 20 and 52 has been described. However, the present invention is not limited to this. , And the seat side 24 may be operated by an electromagnetic force such as an explosive force or a motor based on the detection.

[0062]

According to the vehicle seat of the present invention, it is possible to reduce the pressing force from the seat back locally acting on the occupant's body at the time of a rear collision.

[Brief description of the drawings]

FIG. 1 is a plan view showing a state where an occupant is seated on a vehicle seat according to a first embodiment of the present invention.

FIG. 2 is a front view showing a state where an occupant is seated on a vehicle seat according to the first embodiment of the present invention.

FIG. 3 is a state diagram showing a state of a vehicle seat before and after a pressing force from an occupant is applied.

FIG. 4 is a longitudinal sectional view of a steel wire fixing member used for the vehicle seat according to the first embodiment.

FIG. 5 is an upper body behavior diagram showing a behavior drawn by an occupant's upper body during a collision.

FIG. 6A is a graph showing the rotation angle of the occupant's neck with time at the time of collision, and FIG. 6B is a graph showing the rotation angle of the occupant's waist with time.

FIG. 7 is a pressing force distribution diagram showing a distribution of a pressing force applied to the seat back by the occupant's neck and waist.

FIG. 8 is an operation diagram showing a relationship between a pressure receiving member, a steel wire, and a seat side.

FIG. 9 is an operation diagram of a vehicle seat according to a second embodiment of the present invention.

FIG. 10 is an operation diagram showing a pressure receiving member used for the vehicle seat of the embodiment and a rotating roller interlocked with the pressure receiving member.

FIG. 11 is a perspective view showing a seat back of a conventional automobile seat.

FIG. 12 is a front view showing a seat belt device for a traveling vehicle according to the related art.

[Explanation of symbols]

 10, 50 Vehicle seat 12 Occupant 12B Waist 12C Neck 14 Seat cushion 18 Seat back 20, 52 Pressure receiving member (Pressing force detecting means) 22 Seat side frame (shaft) 24 Seat side (Occupant holding means)

 ────────────────────────────────────────────────── ─── Continuing on the front page (72) Inventor Kazio Miki 41-cho, Chuchu-ji, Yokomichi, Nagakute-cho, Aichi-gun, Aichi F-term in Toyota Central R & D Laboratories Co., Ltd. 3B084 HA09 3B087 BD06 CD04 DE08

Claims (2)

[Claims] 1. A vehicle seat comprising a seat cushion and a seat back, comprising: pressing force detecting means for detecting a pressing force by which a waist of an occupant presses the seat back after a collision from behind the vehicle; Occupant holding means provided on the seat back, activated by the pressing force detecting means, and holding the occupant's waist from both sides to prevent a rebound phenomenon in which the occupant's waist separates from the seat back. A vehicle seat characterized in that: 2. The occupant holding means is connected to the pressing force detecting means and is rotatably provided around an axis provided on the seat cushion or the seat back, and the pressing force detecting means is connected to the occupant. 2. The vehicle according to claim 1, wherein the occupant holding unit rotates about an axis and holds both sides of the occupant's waist as the occupant moves rearward of the seat back by a pressing force from the waist of the occupant. Sheet.