JPH1053097A - Mounting structure of vehicle collision sensor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To sense certainly the acceleration or shock resulting from a collision of a vehicle without causing the cabin to become narrow even in case this is applied to a cab-over type vehicle. SOLUTION: An inner pillar 12a and an outer pillar 12b are joined together to form a front pillar, and a pair of such front pillars 12 each having a closed cross-section are arranged on both sides of the front surface of a vehicle cab 11, and the two ends of a front cross-member 18 extended in the direction across the vehicle width are coupled with the outer pillars 12b of these front pillars 12. A mounting hole 12c is formed in the inner pillar 12a near the coupling part 18a of the front cross-member 18, and at the peripheral edge of this hole 12c a collide sensor 21 is installed with the aid of a bracket 19 in such a way as accommodated in the front pillars 12. The hole 12c is blocked with the bracket 19 and serves also as a hole for works to weld the end of the front cross-member 18 to the outer pillars 12b.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a collision sensor mounting structure suitable for a vehicle, particularly a cab-over type truck, a cab-over type bus, a one-box car, and the like.

[0002]

2. Description of the Related Art Conventionally, as a mounting structure for a collision sensor of this type, an opening or a recess is formed near the front end of a front frame of a vehicle body, and the collision sensor is partially or wholly formed through the opening or the recess. A mounting structure of a vehicle airbag sensor mounted so as to be accommodated in a front frame is disclosed (Japanese Patent Application Laid-Open No. 5-139241). In the mounting structure of the airbag sensor for an automobile configured as described above, even if the collision sensor is mounted on the front end of the front frame as much as possible, the collision sensor does not interfere with the impact wrench for tightening the mounting bolt of the bumper or the like. A sufficient work space for assembling the bumpers and the like can be secured. In addition, by shortening the portion of the front frame where the airbag sensor is hardly deformed by collision, the portion of the front frame near the front end that is easily deformed by collision can be made as long as possible, so that the collision energy absorbing effect at the time of collision can be increased. It has become.

[0003]

However, the above-mentioned conventional mounting structure of an airbag sensor for an automobile can be applied to a passenger car having a front frame below a hood, but is a cab-over type truck or a one-box car without a front frame. In such a case, it is difficult to select a mounting location of the collision sensor, and there is a problem that the mounting of the collision sensor narrows the cabin or damages the collision sensor at the time of collision. An object of the present invention is to provide a mounting structure of a vehicle collision sensor that can reliably detect acceleration or impact due to a vehicle collision without narrowing a cabin even when applied to a cab-over type vehicle.

[0004]

The invention according to claim 1 is
As shown in FIG. 1, a pair of front pillars 12 arranged on both sides of the front surface of the cab 11 and having a closed cross section formed by joining an inner pillar 12a and an outer pillar 12b to each other, and mounting holes formed in the inner pillar 12a. This is a mounting structure for a vehicle collision sensor including a collision sensor 12c and a collision sensor 21 mounted on the periphery of the mounting hole 12c via a bracket 19 and housed in the front pillar 12. In the mounting structure for a vehicle collision sensor according to the present invention, the collision sensor 21 is housed in the front pillar 12 having high rigidity.
Can reliably detect acceleration or impact due to the collision without damage.

[0005] The invention according to claim 2 is the invention according to claim 1, characterized in that, as shown in Fig. 1, the mounting hole 12c is closed by a bracket 19. In the mounting structure for a vehicle collision sensor according to the second aspect, since the mounting hole 12c is closed by the bracket 19, dust and the like are removed from the mounting hole 12c.
Do not enter into 2.

The invention according to claim 3 is the invention according to claim 1 or 2, further comprising a pair of front pillars 1 provided at both ends extending in the vehicle width direction as shown in FIGS.
A front cross member 18 coupled to each of the outer pillars 12b, and a mounting hole 12c is formed in the inner pillar 12 near the coupling portion 18a of the front cross member 18.
a. In the mounting structure for a vehicle collision sensor according to the third aspect, the front pillar 12 containing the collision sensor 21 is connected to the front cross member 18.
Therefore, the rigidity around the collision sensor 21 can be further improved.

The invention according to claim 4 is the invention according to claim 3, and furthermore, as shown in FIG. 1, the mounting hole 12c is used for welding the end of the front cross member 18 to the outer pillar 12b. It is also characterized by having also. In the mounting structure of the vehicle collision sensor according to the fourth aspect, before mounting the collision sensor 21 in the mounting hole 12c via the bracket 19, one electrode of the spot welding machine is inserted from the mounting hole 12c to the outer pillar 12b. The end of the front cross member 18 can be easily welded.

[0008]

Embodiments of the present invention will now be described in detail with reference to the drawings. As shown in FIGS. 1 to 3, a pair of front pillars 12 extending in a substantially vertical direction are disposed on both sides of the front surface of the cab 11 of the cab-over type truck 10. Since these front pillars 12 are bilaterally symmetric, only the left front pillar 12 will be described as a representative, and the description of the right front pillar will be omitted. Front pillar 1
2 has an inner pillar 12a and an outer pillar 12b joined to each other, and the cross section of the front pillar 12 is formed as a closed cross section (FIGS. 1 and 2). A windshield glass 14 is provided above the pair of front pillars 12 (FIGS. 2 and 3).
A dash panel 16 is provided below 4 (FIGS. 1 and 2). Both side edges of the dash panel 16 are welded to the outer panels 12 b of the pair of front pillars 12 (FIG. 1), and the lower edge of the dash panel 16 is the floor panel 1.
7 (FIG. 2).

A front cross member 18 having a substantially hat-like cross section is provided on the lower front surface of the dash panel 16 so as to extend along the vehicle width direction (FIGS. 1 and 2). The front cross member 18 is connected to the front surface of the dash panel 16 by spot welding, and both ends are formed of a pair of front pillars 1.
The second outer pillar 12b is joined to the outer surface of the second outer pillar 12b by spot welding. The inner pillar 12a has a mounting hole 12 near the connecting portion 18a (FIG. 1) at the end of the front cross member 18.
c, that is, the mounting hole 12c is formed to face the end of the front cross member 18 with the outer pillar 12b interposed therebetween. A collision sensor 21 is attached to the periphery of the attachment hole 12c via a bracket 19. The bracket 19 is formed one size larger than the mounting hole 12c, and the bracket 19 closes the mounting hole 12c. The collision sensor 21 is formed one size smaller than the mounting hole 12c, and is configured to be loosely inserted into the front pillar 12 from the mounting hole 12c and housed in the front pillar 12. Nuts 22, 22 are welded to the inner peripheral surface of the mounting hole 12c of the inner pillar 12a, and a bolt 23 can be screwed to the nuts 22, 22 via the bracket 19 and the inner pillar 12a (FIG. 1). Reference numeral 24 in FIG. 1 denotes a front corner panel that covers the outer surface of the front pillar 12, reference numeral 26 denotes an openable / closable front panel provided on the front surface of the cab 11, and reference numeral 27a denotes a lower cover of the instrument panel 27.

In this embodiment, the collision sensor 21 is an acceleration sensor for detecting an acceleration of a predetermined value or more in the traveling direction of the track 10, and uses a piezoelectric phenomenon that generates a potential difference when mechanical strain is applied to a ceramic piezoelectric element. For example, a strain gage type acceleration sensor, a strain gage type acceleration sensor utilizing the fact that the impedance of a resistance wire strain gauge is proportional to acceleration, and the like are used. Although not shown, the detection output of the collision sensor 21 is connected to a control input of a controller, and the control output of the controller is connected to an ignition device of the airbag. Although not shown, the airbag is provided with the above-mentioned ignition device, gas generating means which generates a large amount of gas by burning by the ignition device, and a bag which can be deployed between the abdomen of the driver and the steering wheel by introducing this gas. Having.
The airbag is mounted on a side of the steering column facing the driver's seat with the bag folded.

In this embodiment, a cab-over type truck is used as a vehicle, but a one-box car or a cab-over type bus may be used. In this embodiment, the acceleration sensor is described as the collision sensor. However, an impact sensor that detects an impact load equal to or more than a predetermined value in the traveling direction of the track may be used. As the impact sensor, a sensor that detects a force generated by an impact such as a collision by using a piezoelectric element or a resistance wire strain gauge similarly to the acceleration sensor, or a sensor that detects a relative motion due to the impact by using a magnet and a coil is used. Furthermore, in this embodiment, the airbag is operated based on the detection output of the collision sensor, but the means for moving the driver's seat backward or other secondary collision avoidance means is activated based on the detection output of the collision sensor. May be.

In the mounting structure of the collision sensor 21 configured as described above, even if the truck 10 collides, the collision sensor 21
Is protected by the extremely rigid front pillar 12 reinforced by the front cross member 18, so that the acceleration at the time of collision can be reliably detected. As a result, based on the detection output of the collision sensor 21, although not shown, the controller can operate the ignition device to instantly deploy the bag. The spot cross welding of the front cross member 18 to the front surface of the dash panel 16 and the outer surface of the outer pillar 12b is performed after the dash panel 16 is welded to the front pillar 12 and the floor panel 17 and before the front corner panel 24 is assembled. Will be For spot welding to the outer surface of the outer pillar 12b at both ends of the front cross member 18, one of a pair of electrodes of a spot welder (not shown) is inserted from the mounting hole 12c and pressed against the inner surface of the outer pillar 12b, while the other electrode is pressed. Is pressed against the outer surface of the end of the front cross member 18. In this manner, the mounting hole 12c also serves as a work hole for spot welding.

The bracket 19 is mounted on the periphery of the mounting hole 12c by screwing a bolt 23 to a nut 22 in a state where the collision sensor 21 is accommodated in the front pillar 12, so that the vehicle interior is narrowed by the collision sensor 21. Since the mounting hole 12c is closed by the bracket 19, dust and the like do not enter the front pillar 12 from the mounting hole 12c. Furthermore, even if the occupant's feet or hands move carelessly, or if careless movements occur during work such as replacing parts in the instrument panel, the occupant's feet, hands or tools may come into contact with the collision sensor. Since no collision occurs, the collision sensor can be protected.

[0014]

As described above, according to the present invention, a pair of front pillars having a closed cross section formed by joining an inner pillar and an outer pillar to each other are arranged on both sides of the front surface of the cab. A mounting hole is formed, and the collision sensor is mounted on the periphery of the mounting hole via a bracket so as to be housed in the front pillar. Acceleration or impact can be reliably detected. Also, since the collision sensor is housed in the front pillar, it does not narrow the cabin, and due to inadvertent movement of the occupant's feet and hands and inadvertent movements during work such as replacing parts in the instrument panel Contact with the collision sensor can be prevented, thereby protecting the collision sensor. Further, if the mounting hole is closed by the bracket, dust and the like do not enter the front pillar from the mounting hole.

Further, if the both ends of a front cross member extending in the vehicle width direction are respectively connected to outer pillars of a pair of front pillars, and a mounting hole is formed in an inner pillar near a connecting portion of the front cross member, the collision sensor can be formed. Since the accommodated front pillar is reinforced by the front cross member, the rigidity around the collision sensor can be further improved. Further, if the mounting hole also serves as a working hole for welding the end of the front cross member to the outer pillar, one electrode of the spot welding machine is inserted from the mounting hole to easily weld the end of the front cross member to the outer pillar. it can.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view taken along line AA of FIG. 3, showing a mounting structure of a vehicle collision sensor according to an embodiment of the present invention.

FIG. 2 is a perspective view of a main part in a cab including a mounting hole of the collision sensor.

FIG. 3 is a perspective view of the cab.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Cab-over type truck (vehicle) 11 Cab 12 Front pillar 12a Inner pillar 12b Outer pillar 12c Mounting hole 18 Front cross member 18a Joining part 19 Bracket 21 Collision sensor

Claims (4)

[Claims] 1. A pair of front pillars (12) arranged on both sides of a front surface of a cab (11) and having a closed cross section formed by joining an inner pillar (12a) and an outer pillar (12b) to each other; A mounting hole (12c) formed in (12a), and a collision sensor mounted on the periphery of the mounting hole (12c) via a bracket (19) and housed in the front pillar (12).
(21) A mounting structure for a vehicle collision sensor comprising: 2. The mounting structure for a vehicle collision sensor according to claim 1, wherein said mounting hole is closed by said bracket. 3. A front cross member (18) extending in the vehicle width direction and having both ends coupled to outer pillars (12b) of a pair of front pillars (12), respectively, and a mounting hole (12c) is formed in the front cross member. 2. An inner pillar (12a) formed near a coupling site (18a) of a cross member (18).
Or the mounting structure of the vehicle collision sensor according to 2. 4. The mounting hole (12c) has a front cross member (1).
4. The mounting structure for a vehicle collision sensor according to claim 3, wherein the end of (8) also serves as a working hole for welding the outer pillar (12b).