JP2001163175A - Occupant crash protection device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an occupant crash protection device capable of simultaneously miniaturizing a car body dimension and reducing occupant deceleration in a higher dimension. SOLUTION: The occupant crash protection device comprises a body having two parts (an engine room 1a and a load transmitting member 7 of a main frame 1 in an embodiment) that can relatively move longitudinally in a collision and deforms by collision load from the front side, a seat 5 disposed on the more deformable first part (a car room part 1a in the embodiment) at the initial time of the collision of the two parts, and a seat belt 8 having a shoulder anchor 9 connected to the less deformable second part (a slide frame 3 in the embodiment) at the initial time of the collision of the two parts. A deceleration higher than a deceleration of a room part can be generated on the shoulder anchor at the instant of the collision, so that constraint force of the occupant by the seat belt can be increased at the initial time of the collision.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an occupant protection device, and more particularly to an occupant protection device for reducing deceleration acting on an occupant in a vehicle collision.

[0002]

2. Description of the Related Art In recent years, in order to enhance the occupant protection effect at the time of a collision, a deformation mode at the time of collision of a portion other than the living space of the vehicle body is appropriately set to reduce the deceleration of the living space portion of the vehicle body. Various body structures have been proposed in which deformation is prevented from reaching the living space (Japanese Patent Laid-Open No. 7-101354).
No., etc.).

On the other hand, the deceleration of an occupant restrained by a seat with a seatbelt rises only when a forward inertial force acting on the occupant during a vehicle collision is received by the seatbelt. Here, since the spring action of the seat belt cannot be completely eliminated, the occupant moves forward due to inertial force, and the occupant deceleration reaches a peak when the seat belt elongates to a maximum, It is said that the peak value of the occupant deceleration increases as the amount of movement of the occupant due to the inertial force increases, and is generally higher than the average deceleration of the living space portion of the vehicle body. Therefore, in order to reduce the impact received by the occupant during a collision, it is necessary to adjust the vehicle body deceleration so that the time delay of the rise of the occupant deceleration with respect to the vehicle body deceleration is as small as possible.

[0004]

However, it is practically impossible to integrally connect the occupant to the vehicle body, and in particular, it is difficult to take a sufficient deformation stroke of a portion of the vehicle body other than the living space. In the case of (1), it is difficult to further reduce the occupant deceleration only by the conventional method of reducing the deceleration of the living space portion at the time of collision by setting the deformation stress of the vehicle body.

The present invention has been devised in order to solve such problems of the prior art, and an object of the present invention is to achieve both higher compactness of the vehicle body and reduction of the occupant deceleration. It is an object of the present invention to provide an occupant protection device that can be used.

[0006]

In order to achieve such an object, the present invention provides two parts (embodiments) which are relatively movable in the front-rear direction at the time of a collision and which are deformed by receiving a collision load from the front. A vehicle body including the engine room portion 1a and the load transmitting member 7) of the main frame 1 in the first embodiment, and a first portion side (the vehicle compartment portion in the embodiment) of the two portions which is easily deformed in the early stage of collision. The shoulder anchor (9) is connected to the seat (5) provided in 1a) and the second part (the slide frame 3 in the embodiment) of the two parts which is hardly deformed due to the initial stage of collision. An occupant protection device having a seat belt (8) is provided.

According to this, a deceleration higher than the deceleration of the passenger compartment can be generated in the shoulder anchor at the moment of the collision, so that the restraining force of the occupant by the seat belt can be increased in the early stage of the collision.

[0008] In particular, if it is also provided with means for preventing relative movement between the two parts (stopper 11 in the embodiment) and buffer means (12) provided on the means for preventing relative movement, the living room is provided at the beginning of the collision. The deceleration of the connecting portion of the shoulder anchor once higher than the deceleration of the portion can be instantaneously changed to the deceleration in the opposite direction so as to be equal to the deceleration of the living room portion.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below in detail with reference to embodiments shown in the accompanying drawings.

FIG. 1 is a conceptual side view showing a vehicle body structure according to the present invention. In this vehicle body structure, a main frame 1 extending in the front-rear direction of the vehicle body, a floor 2 integrally connected to a cabin portion 1a of the main frame 1, and a rearwardly movable distance from the main frame 1 for a certain distance are connected. A seat 5 on which an occupant 4 sits is substantially integrally connected to the floor 2 on the floor 2.

The engine room part 1 of the main frame 1
The front bumper beam 6 is connected to the front end of the b. The engine room portion 1b has a function of buckling and deforming under an impact load at the time of a collision and reducing the deceleration acting on the vehicle room portion 1a. The front bumper beam 6 and the slide frame 3 are connected to each other by a load transmitting member 7 made of a material that is less likely to buckle and deform than the engine room portion 1b of the main frame 1.

At the rear end of the slide frame 3, a shoulder anchor 9 of a seat belt 8 that is wrapped around the body of the occupant 4.
The shoulder anchor support pillar 10 along the center pillar is rigidly connected to support the center pillar. A known retractor with an emergency locking device (not shown) is incorporated in the shoulder anchor support pillar 10, and the normal use of the seat belt 8 is the same as that of the type commonly used today. There is no change.

At a position on the floor 2 facing the rear end of the slide frame 3, a stopper 11 is provided to regulate the backward movement distance of the slide frame 3, that is, the shoulder anchor support pillar 10. This stopper 11
Is provided with a buffer means 12 such as a honeycomb structure.

Next, the operation of the device of the present invention will be described.
It is assumed that a vehicle has a frontal collision with a road structure, and the description will be made with reference to FIGS. 2 and 3.

The moment the vehicle collides, the engine room portion 1b of the main frame 1 receives an impact load and starts to deform. However, the load transmitting member 7 is harder to deform than the engine room portion 1b. Since the mass of the slide frame 3 side is sufficiently smaller than the mass of the vehicle compartment 1a, the slide relative to the vehicle compartment 1a of the main frame 1 that continues to move forward due to the buckling deformation of the engine compartment 1b. The frame 3, ie, the shoulder anchor supporting pillar 10, moves relatively rearward (FIG. 2-A). As a result, the shoulder anchor 9 has a large deceleration (region a in FIG. 3) that rises more steeply than the vehicle compartment 1a.
Slows down earlier.

In this state, the occupant 4 attempts to continue moving forward due to the inertial force.
As described above, the shoulder anchor 9 connected to the shoulder anchor support pillar 10 which is integral with the passenger compartment 4 instantaneously moves rearward with respect to the passenger compartment 1a of the main frame 1 as described above. The restraining force increases, and the occupant 4 is prevented from moving forward.

In the middle stage of the collision, the forward movement of the slide frame 3 at the rear end of the slide frame 3 where the deceleration is greater than that of the cabin portion 1a of the main frame 1 due to the load transmitting member 7 being stretched. (FIG. 2-B). Then, the inertia force of the cabin part 1a is transmitted to the slide frame 3,
The deceleration acting on the shoulder anchor support pillar 10 is reduced (region b in FIG. 3). As a result, the tension of the seat belt 8 acting on the chest of the occupant 4 instantaneously reaches a stable state. The gradient of the deceleration at this time is adjusted by the deformation characteristics of the buffering means 12.

At the end of the collision, the deceleration increases at the moment when the deformation of the shock absorbing means 12 bottoms out and the deformation stress of the load transmitting member 7 is applied to the deformation stress of the engine room portion 1b of the main frame 1 (c in FIG. 3). Then, the vehicle compartment 1a of the main frame 1 and the slide frame 3 are integrally decelerated (FIG. 2-C). Then, through the above process, the relative speed between the cabin portion 1a and the slide frame 3 becomes zero, and the restraining load of the seat belt 8 balances the deceleration at the end of the collision. And this state is continued until the vehicle body completely stops (region d in FIG. 3).

In considering the reduction of the impact on the occupant 4 in the event of a vehicle collision, it is important to first reduce the occupant deceleration. However, as described above, the deceleration is higher than the average vehicle deceleration at the beginning of the collision. A deceleration waveform in which a speed is generated in the shoulder anchor 9 of the seat belt 8 for a short time, a reverse deceleration (acceleration) is generated in the shoulder anchor 9 for a short time, and then the vehicle is decelerated at the average vehicle deceleration (FIG. 3) (Solid line), the occupant deceleration can be suppressed to be lower than that of a vehicle not equipped with the present device, as shown by the broken line in FIG.

The mechanism for transmitting the force applied to the slide frame 3 to the shoulder anchor 9 is not limited to the above-described structure, and may use a wire 13 and a guide sheave 14 as shown in FIG. As shown in (1), various modifications can be made, such as using a combination of a sector gear 15 and a lever 16 that mesh with each other.

[0021]

As described above, according to the present invention, a deceleration higher than the vehicle body deceleration is generated in the shoulder anchor in the early stage of the collision to increase the restraining force of the occupant by the seat belt. By generating the acceleration in the direction, the tension of the seat belt can be optimized, so that the deceleration of the vehicle body, the seat, and the occupant at the end of the collision can be made equal to each other. Therefore, according to the present invention, it is possible to generate a deceleration waveform suitable for reducing the occupant deceleration on the seat belt, and it is possible to achieve a significant reduction in the occupant deceleration peak value with a smaller vehicle body deformation amount than in the related art. Moreover, since the amount of movement of the occupant relative to the vehicle body in the vehicle interior can be reduced, the possibility of a secondary collision in which the occupant hits a structure in the vehicle interior and is injured can also be reduced.

[Brief description of the drawings]

FIG. 1 is a schematic configuration diagram of a vehicle body to which the present invention is applied.

FIG. 2 is an explanatory diagram of an operation process of the device of the present invention.

FIG. 3 is a deceleration waveform diagram at the time of a collision.

FIG. 4 is a main part configuration diagram showing another embodiment.

FIG. 5 is a main part configuration diagram showing still another embodiment.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Main frame 1a Car room part, 1b Engine room part 3 Slide frame 5 Seat 7 Load transmission member 8 Seat belt 9 Shoulder anchor 11 Stopper 12 Buffer means

 ────────────────────────────────────────────────── ─── Continued on front page (72) Inventor Kazuya Yoshida 1-4-1 Chuo, Wako-shi, Saitama F-term in Honda R & D Co., Ltd. 3D018 BA16 DA00 MA00

Claims (2)

[Claims] 1. A vehicle body comprising two parts which are relatively movable in the front-rear direction at the time of a collision and which are deformed by receiving a collision load from the front, and a first part of the two parts which is easily deformed in the early stage of the collision.
A sheet provided on the side of the second part;
An occupant protection device characterized by having a seat belt to which a shoulder anchor is connected on the side of the occupant. 2. The occupant protection system according to claim 1, further comprising: means for preventing relative movement between the two parts, and a cushioning means provided on the prevention means.