JPH05139241A - Mounting structure of airbag sensor for automobile - Google Patents

Abstract

PURPOSE:To provide the mounting structure of an airbag sensor for an automobile in which a collision energy absorb operation in the front end near part of a front frame can be increased easily while securing sufficiently the assembling work space of a bumper and the like. CONSTITUTION:One part or all parts of an airbag sensor 4 are arranged on the front end near part of a front frame 3 and the work space of an impact wrench 24 for assembling a bumper 22 and the like is secured on the side of the airbag sensor 4. Thereby, a non-crush part 3a hardly producing any crush in the vicinity of the front end of the front frame 3 on which the airbag sensor 4 is mounted can be shortened to the utmost and the part being liable to crush can be increased and a collision energy absorbing action is increased.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vehicle airbag sensor mounting structure.

[0002]

2. Description of the Related Art Conventionally, regarding an airbag device for an automobile, a frontal collision or the like is detected by a plurality of airbag sensors mounted on a vehicle body, and the airbag is inflated and deployed from a steering handle or the like, so that an occupant at the time of the collision can be inflated. Various types of shock absorbers are proposed and put into practical use (actual Kaihei 2-100) to prevent a secondary collision of an occupant with a steering wheel or a windshield.
962). Usually, the airbag device includes three relatively low-sensitivity airbag sensors provided at the front end sides of the left and right front frames and near the center of the shroud upper, and at the lower end of the instrument panel. It is equipped with a pair of left and right airbag sensors with a relatively high sensitivity, a total of five airbag sensors. Of the three airbag sensors on the front side of the vehicle body, the airbag is inflated and deployed only in the event of a collision. One is ON,
In addition, the airbag is configured to inflate and deploy when one of the two airbag sensors on the vehicle compartment side is turned on.

Since a collision may not be accurately detected if the attitude of the airbag sensor changes during a collision, the airbag sensor is attached to a member having a relatively high rigidity that hardly deforms even during a collision. For this reason, a pair of left and right airbag sensors at the front of the vehicle body are usually reinforced to secure initial proof strength in the case of a frontal collision, and are hard to crash near the front end of the front frame (hereinafter referred to as non-crash portion). Is attached to the outer surface of. Moreover, because the impact wrench is inserted into the side of the front frame and the bumper is attached to the front end of the front frame with bolts, the airbag sensor has a space for inserting the impact wrench and the rear part of the non-crash portion. Installed on.

On the other hand, the members constituting the front part of the vehicle body of an automobile are subjected to collision energy by deformation so as to ensure sufficient safety of passengers even if a large external force is applied due to a frontal collision or the like. Has been devised to effectively absorb the. For example, there is a front frame in which ribs are provided at predetermined intervals inside the front frame, and the front frame is deformed into a bellows shape at the time of a frontal collision to effectively absorb collision energy. In particular, in a vehicle with a short nose, the distance from the front end of the vehicle to the vehicle interior is shortened, so the crashable part of the front part of the vehicle body during a frontal collision is maximized to effectively absorb impact energy. There is a need.

[0005]

As described above, when assembling the airbag sensor to the side portion near the front end of the front frame, in order to secure a working space for the impact wrench inserted for assembling the bumper, Since it is necessary to attach the airbag sensor to the rear portion of the non-crush portion, there is a problem that the crashable portion is shortened by that much and the energy absorbing action in the vicinity of the front end of the front frame is reduced.

An object of the present invention is to provide a mounting structure for an automobile air bag sensor capable of easily increasing the collision energy absorbing action in the vicinity of the front end of the front frame while ensuring a sufficient working space for mounting a bumper or the like. It is to be.

[0007]

According to a first aspect of the present invention, there is provided a mounting structure for an airbag sensor for a vehicle according to claim 1, wherein the airbag sensor is mounted on a front frame of a vehicle body. It is arranged in the vicinity of the front end of the.

According to a second aspect of the present invention, there is provided a vehicle airbag sensor mounting structure according to the first aspect of the present invention, wherein in the vehicle airbag sensor mounting structure according to the first aspect, an opening is formed in a side wall portion of the front frame near a front end of the front frame. And an airbag sensor is attached through the opening.

According to a third aspect of the present invention, there is provided a vehicle airbag sensor mounting structure according to the first aspect, wherein a recess is formed in a side wall portion of the front frame near a front end of the front frame. It is formed and an air bag sensor is attached to the recess.

[0010]

In the automobile airbag sensor mounting structure according to the first aspect of the present invention, since the airbag sensor is partially or wholly disposed in the vicinity of the front end of the front frame, the airbag sensor is mounted on the front frame as much as possible. Even if it is arranged on the front end side, it is possible to insert the impact wrench on the side of the airbag sensor and fasten the bumper etc., and while securing a sufficient working space for the impact wrench, the front frame near the front end It is possible to further increase the safety of the occupant by increasing the collision energy absorption effect at the time of a collision by making the portion that easily crashes as long as possible.

In the automobile air bag sensor mounting structure according to the second aspect, the same operation as that of the first aspect can be obtained. In addition, since the airbag sensor is mounted inside the front frame of the front frame through the opening formed in the side wall of the front frame near the front frame of the front frame, the airbag sensor has a simple structure. Can be assembled.

In the structure for mounting the automobile air bag sensor according to the third aspect, the same operation as the first aspect can be obtained. In addition, a recess is formed in the side wall of the front frame near the front end of the front frame, and the airbag sensor is mounted in this recess. The initial yield strength of is sufficiently secured, and the deformation of the concave portion at the time of a frontal collision is suppressed,
The disconnection of the harness of the airbag sensor led out of the recess is prevented.

[0013]

As described in detail in the above section,
The following effects can be obtained. According to the vehicle airbag sensor mounting structure of the first aspect of the present invention, the collision wrench in the frontal collision is ensured by making the crash-prone portion of the front frame near the front end as long as possible while ensuring a sufficient working space for the impact wrench. Increase energy absorption,
The safety of passengers can be further improved.

According to the automobile airbag sensor mounting structure of the second aspect, the same effect as that of the first aspect can be obtained. In addition, the airbag sensor can be easily assembled through the opening with a simple structure in which the opening is formed in the side wall of the front frame near the front end of the front frame.

According to the vehicle airbag sensor mounting structure of the third aspect, the same effect as that of the first aspect can be obtained. In addition, it is possible to secure sufficient initial proof strength of the front frame and prevent disconnection of the harness of the airbag sensor at the time of a frontal collision.

[0016]

Embodiments of the present invention will be described below with reference to the drawings. The present embodiment is a case where the present invention is applied to a mounting structure of an airbag sensor, which is disposed in the vicinity of the front ends of the left and right front frames among a plurality of airbag sensors of an automobile airbag device. First, the configuration of the airbag device will be briefly described. As shown in FIG. 1, the airbag device includes an airbag module 2 assembled in a substantially central portion of a steering handle 1 and a pair of airbag sensors arranged near front ends of left and right front frames 3. 4, one airbag sensor 6 attached to a substantially central portion of the shroud upper, a pair of left and right airbag sensors 8 attached to a lower portion of the instrument panel 7, and these five airbag sensors 4 and 6 A control box 9 for operating the airbag module 2 based on the output from 8 is provided.

The airbag module 2 has a general structure including an ignition device, a gas generator, and an airbag 10. When the ignition device is actuated by the drive current from the control box 6, the airbag module 2 is activated. A large amount of combustion gas is generated, and as shown by the phantom line in FIG.
0 is expanded and deployed instantaneously by the pressure of the combustion gas, and the secondary collision of the occupant with the steering wheel 1 and the windshield is prevented in advance.

Each of the airbag sensors 4, 6 and 8 has a general structure, and as shown in FIG. 2, a substantially cylindrical storage space 13 formed in a pair of holder members 11 and 12.
A steel ball 15 attracted to one end side of the housing 14 via a magnet 14 moves to the other end side of the housing space 13 by the inertial force at the time of a frontal collision, and is provided on the other end side of the housing space 13. The pair of electrode wires 16 are in a conductive state via the steel balls 15 to detect a frontal collision. In order to detect a frontal collision, the airbag sensors 4, 6 and 8 are arranged so that the axis of the accommodation space 13 is oriented in the front-rear direction and the steel ball 15 is attracted to the rear end side of the accommodation space 13 by the magnet 14. It is attached to the car body. Of the five airbag sensors 4, 6 and 8, the three airbag sensors 4 and 6 provided at the front of the vehicle body are set to have relatively low sensitivity, and the two airbag sensors 8 provided at the passenger compartment side are provided. Is set to have a relatively high sensitivity, and in the control box 9, one of the three airbag sensors 4 and 6 on the front of the vehicle body is turned ON, and one of the two airbag sensors 8 on the passenger compartment side is activated. When the two are turned on, a drive current is output to the ignition device to inflate and deploy the airbag 10.

Next, the mounting structure of the airbag sensor 4 arranged near the front ends of the left and right front frames 3 will be described. Since the mounting structure of the airbag sensors 6 and 8 is not directly related to the present invention, detailed description thereof will be omitted. As shown in FIG. 1, FIG. 3, and FIG. 4, reinforcement plates 17 are provided near the front ends of the left and right front frames 3 having a closed cross section in order to secure initial proof strength in the event of a frontal collision.
A non-crash portion 3a that is reinforced with a hard to crash is formed, a shroud panel 18 is provided between the front end portions of the left and right front frames 3, and a pair of left and right crash cans 19 are provided on the front side of the shroud panel 18. Bumpers 22 that are provided corresponding to the left and right front frames 3 and that extend in the vehicle width direction are provided on the front side of the shroud panel 18, and openings 22a are formed in the vicinity of the left and right ends of the rear wall of the bumper 22. The left and right crush cans 19 are mounted in a bumper 22 in a protruding manner through the openings 22a, and the shroud panel 18, the crush can 19, and the bumper 22 are fixed to the bumper 22 by a bolt member 23.
A nut member 23b is fastened to a and fastened to the flange portion 3b of the front frame 3 together. The nut member 2
3b are fastened with impact wrenches 24 inserted on both left and right sides of the front frame 3 near the front end thereof.

An opening 25 is formed through the outer wall of the front frame 3 near the front end and the reinforcing plate 17,
The airbag sensor 4 is attached to the opening 25 in a state that approximately 3/4 of the airbag sensor 4 projects into the internal space 20 of the front frame 3 so as not to overlap the impact wrench 24 in the vehicle width direction. 4 is a fixed plate 26
It is fixed to the front frame 3 and the reinforcing plate 17 via the, and a slight gap is formed between the edge portion 3c of the front frame 3 facing the opening 25 and the airbag sensor 4, and the control box 9 and the airbag sensor 4 are connected to each other. A pair of harnesses 27 that connect to each other is introduced from the control box 9 through the outside of the front frame 3 into the airbag sensor 4 from the outside portion of the airbag sensor 4 protruding outside the front frame 3.

Next, the operation of the mounting structure of the airbag sensor 4 will be described. Since about 3/4 of the airbag sensor 4 is inserted into the front frame 3 through the opening 25 so as not to interfere with the impact wrench 24, the impact wrench 24 is used to fasten the nut member 23b. It is possible to arrange the airbag sensor 4 on the front side as much as possible while ensuring a sufficient working space. As a result, the non-crash portion 3a can be configured to be short, the crashable portion can be made as long as possible in the front-rear direction, and the collision energy absorbing action in the vicinity of the front end of the front frame 3 can be increased to further improve the safety of the occupant. Can be improved. Particularly in a short nose vehicle in which the length from the front end of the vehicle body to the lower end of the windshield is shortened, the safety of the occupant can be further improved by making the crashable portion as long as possible in the front-rear direction. In addition, about 1/4 of the airbag sensor 4 is projected to the outside of the front frame 3 from which the airbag sensor 4 is
Since the harness 27 is led out, the harness 2 is provided between the airbag sensor 4 and the edge portion 3c of the front frame 3.
7 will not get caught and broken.

As described above, it is possible to secure a sufficient working space for fastening the nut member 23b by the impact wrench 24, and to make the crashable portion as long as possible in the front-rear direction so that the collision energy in the vicinity of the front end of the front frame 3 is large. It is possible to obtain the effects of increasing the absorbing action, further improving the safety of the occupant, and preventing the harness 27 from being broken during a frontal collision.

Next, another embodiment of the mounting structure of the airbag sensor 4 will be described. The same members as those in the above embodiment are designated by the same reference numerals, and detailed description thereof will be omitted. [First Embodiment] As shown in FIGS. 5 and 6, the entire airbag sensor 4 is mounted in the vicinity of the front end of the front frame 3 through the opening 25 so that the airbag sensor 4 does not project outward. The front portion of the airbag sensor 4 is fixed to the side wall portion of the front frame 3 on the front side of the opening portion 25 by the substantially crank-shaped fixing plate 26A, and the rear end portion of the airbag sensor 4 passes through the opening portion 25. It is fixed to the side wall portion of the front frame 3 behind the opening 25 by a substantially L-shaped fixing plate 26B having a restriction portion 26a extending inside the front frame 3. According to this mounting structure, the same effect as that of the above embodiment can be obtained. The fixed plate 26A ・ 2
6B restricts relative movement of the airbag sensor 4 with respect to the side wall of the front frame at the time of a frontal collision, so that the harness 2 led out from the opening 25.
7 disconnection is prevented.

[Second Embodiment] As shown in FIGS. 7 and 8, the concave portion 2 is formed in the side wall portion near the front end of the front frame 3.
8 is formed, and the airbag sensor 4 is provided in the recess 28.
Is attached, and a fixing plate 26C that prevents the airbag sensor 4 from falling off is fixed to the front frame 3 across the opening 25A of the recess 28. According to this mounting structure, the same effect as that of the above embodiment can be obtained. In addition, the wall 28a forming the recess 28 and the relatively high-rigidity airbag sensor 4 mounted in the recess 28 ensure a sufficient initial yield strength of the front frame 3. In the case of a frontal collision, the wall portion 28a is stretched via the airbag sensor 4 to suppress the deformation of the opening 25A and prevent the harness 27 from being disconnected from the opening 25A.

In this embodiment, the opening 25 or the recess 28 is formed in the outer wall of the front frame 3 to assemble the airbag sensor 4, but the opening is formed in the inner wall and the upper and lower walls. The airbag sensor 4 may be assembled by forming a part or a recess. In addition, the opening 25
Alternatively, the airbag sensor 4 may be fixed by a fixing plate capable of closing the recess 28.

[Brief description of drawings]

FIG. 1 is a perspective view of an automobile.

FIG. 2 is a vertical sectional view of an airbag sensor.

FIG. 3 is a perspective view of the vicinity of a front end portion of a front frame.

FIG. 4 is a cross-sectional view near the front end of the front frame.

FIG. 5 is a view corresponding to FIG. 3 of a mounting structure according to a first alternative embodiment.

FIG. 6 is a view corresponding to FIG. 4 of a mounting structure according to a first alternative embodiment.

FIG. 7 is a view corresponding to FIG. 3 of a mounting structure according to a second alternative embodiment.

FIG. 8 is a view corresponding to FIG. 4 of a mounting structure according to a second alternative embodiment.

[Explanation of symbols]

 3 Front Frame 4 Airbag Sensor 25 Opening 28 Recess

 ─────────────────────────────────────────────────── ─── Continuation of front page (72) Inventor Megumi Makimoto 3-1, Shinchi Fuchu-cho, Aki-gun, Hiroshima Prefecture Mazda Motor Corporation

Claims (3)

[Claims] 1. A mounting structure for mounting an air bag sensor on a front frame of a vehicle body, wherein a part or all of the air bag sensor is arranged in a portion near a front end of a front frame. Mounting structure. 2. The automotive air bag according to claim 1, wherein an opening is formed in a side wall of the front frame near the front end of the front frame, and an airbag sensor is mounted through the opening. Bag sensor mounting structure. 3. The automobile airbag sensor according to claim 1, wherein a recess is formed in a side wall portion of the front frame near a front end of the front frame, and an airbag sensor is mounted in the recess. Mounting structure.