JPH1024800A - Mounting structure of side impact sensor - Google Patents

Abstract

(57) [Summary] [PROBLEMS] To suppress a significant increase in the weight of a vehicle body and efficiently and quickly detect a collision. SOLUTION: A straight portion 18A serving as a rocker upper portion of an opening flange 18 formed in a front side door opening 16 of a side member outer panel 10, and a curved portion of the opening flange 18 formed on a lower front side of a center pillar portion 12. A portion of the rocker inner panel 24 that is located inside the boundary point P1 between the inner side of the rocker inner panel 24 and the boundary point P1 is a sensor mounting portion 30. An acceleration sensor 46 is attached to the sensor attachment portion 30 with a bolt or the like via a bracket 48, so that the sensor can be moved very efficiently in the event of a collision from the side or an oblique collision.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a side collision sensor mounting structure, and more particularly to a side collision sensor mounting structure for operating an airbag device or the like when a force acts on a side door from the side. About.

[0002]

2. Description of the Related Art Conventionally, an example of a mounting structure of a side collision sensor applied to a vehicle such as an automobile is disclosed in Japanese Utility Model Laid-Open No. 1-11.
Nos. 7957 and 6-1035 are known.

[0003] As shown in FIG.
In the mounting structure of the side collision sensor of No. 57, the side sill (also referred to as rocker) 7 located below the side door 70 is provided.
2, a collision sensor 74 is provided, and the collision sensor 74 is attached to the rocker inner panel 76.

Further, as shown in FIG.
In the mounting structure of the side collision sensor of No. 035, a transmission member 84 is fixed to an impact beam 82 provided in the side door 80, and a distal end portion 84 of the transmission member 84 is provided.
A reaches the vicinity of the collision sensor 88 provided in the rocker 86.

[0005]

However, in the mounting structure of the side collision sensor shown in FIG. 7, a work hole for mounting the collision sensor 74 and a lid for closing the work hole are attached to the rocker outer panel 78, for example. It is necessary to provide them, and the number of parts increases and the weight of the vehicle body increases.

[0008] In the mounting structure of the side collision sensor shown in FIG. 8, the transmission member 84 is fixed to the front portion of the impact beam 82. Therefore, the impact beam 82
If a collision occurs at the rear of the
The deformation of the front portion of the impact beam 82 is delayed and the amount of deformation is smaller than the deformation of the rear portion of the impact beam 82, so that it may take time to detect the collision. Furthermore, since it is a place where water easily enters, a waterproofing measure is required, and a mechanism for preventing the collision sensor 88 from operating when the side door 80 is strongly closed is required, which increases the number of parts. The body weight increases.

[0007] A side collision sensor mounting structure in which a collision sensor is disposed in the center pillar is also conceivable. However, this configuration is excellent when another vehicle collides with the center pillar of the own vehicle from the side. Demonstrates the sensing function,
If the other vehicle collides with the own vehicle from an oblique side, that is, if the bumper of the other vehicle first collides between the front side door of the own vehicle or the front pillar and the center pillar of the rocker, the front side door It is difficult for the impact to be transmitted to the center pillar, and the collision detection tends to be delayed. For this reason, in this configuration, it is necessary to provide a structure for reinforcing the impact beam in the rocker cross section and the side door to easily transmit an impact to the center pillar, and the weight of the vehicle body is greatly increased by the reinforcing member and the like.

In view of the above, an object of the present invention is to provide a mounting structure for a side collision sensor capable of suppressing a significant increase in the weight of a vehicle body and efficiently and quickly detecting a collision.

[0009]

According to a first aspect of the present invention, there is provided a side collision sensor mounting structure comprising: a linear portion which is a rocker upper portion of an opening flange formed at a front side door opening; An acceleration sensor is attached near a boundary point between the lower part of the center pillar and a curved part which is a front part.

Therefore, when the other vehicle collides with the center pillar from just beside and collides with the front side door from diagonally forward, the front side door opening, which is a suddenly changing section of the rocker section, is suddenly changed. The vicinity of the boundary between the straight portion of the opening flange formed at the upper portion of the rocker at the upper portion and the curved portion of the lower portion of the opening flange at the front of the center pillar is a trigger for rocker breakage. Therefore, when the rocker is deformed inward in the vehicle width direction, the amount of movement of this position inward in the vehicle width direction is larger than the amount of movement of other positions, and the acceleration sensor attached to this position causes A collision can be detected very efficiently and quickly for a collision and an oblique collision.

In addition, since the required amount of reinforcing members having a rocker cross-section required in the prior art is minimized, a significant increase in the weight of the vehicle body can be suppressed.

According to a second aspect of the present invention, there is provided the mounting structure for a side collision sensor according to the first aspect, wherein the acceleration sensor is mounted at a position higher than a center of the rocker section. .

Therefore, at the time of a side collision, the rocker receives bending and torsional forces from the center pillar and the door. For this reason, by mounting the acceleration sensor above the center of the cross section of the rocker, the acceleration sensor is easily affected by these forces in addition to the forces in the vehicle width direction, and the detection performance is further improved.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of a mounting structure for a side impact sensor according to the present invention will be described with reference to FIGS.

In the drawings, an arrow FR indicates a forward direction of the vehicle, an arrow UP indicates an upward direction of the vehicle, and an arrow IN indicates an inward direction of the vehicle width.

As shown in FIG. 2, in the vehicle of this embodiment, the center pillar portion 1 is provided on the side member outer panel 10.
2 and the rocker portion 14 are integrally formed. A front side door opening 16 is provided at the front of the center pillar 12.
The front side door opening 16
An opening flange 18 for a front side door 17 (see FIG. 3) is formed on an inner peripheral portion of the opening. The boundary point between the straight portion 18A of the opening flange 18 formed at the upper portion of the rocker portion 14 and the curved portion 18B of the opening flange 18 formed at the front lower portion of the center pillar portion 12 is P1. It is shown.

As shown in FIG. 1, a center pillar inner panel 20 is joined to the inner side of the center pillar portion 12 of the side member outer panel 10 in the vehicle width direction.
The center pillar portion 12 forms a center pillar 21 having a closed cross-sectional structure extending in the vehicle vertical direction.

As shown in FIG. 2, the center pillar 12
A center pillar outer reinforcement 22 is disposed inside the vehicle width direction, and the center pillar outer reinforcement 22 and the center pillar inner panel 20 form a closed cross-section extending in the vehicle vertical direction.

As shown in FIG. 3, the cross-sectional shape of the rocker portion 14 of the side member outer panel 10 as viewed from the front of the vehicle is U-shaped with the opening directed inward in the vehicle width direction. Are formed with an upper flange 14A and a lower flange 14B. A rocker inner panel 24 is disposed inside the rocker portion 14 in the vehicle width direction.

The cross-sectional shape of the rocker inner panel 24 as viewed from the front of the vehicle has a U-shape with an opening directed outward in the vehicle width direction. A flange 24B is formed. A lower flange 24D is formed at the outer end in the vehicle width direction of the lower wall portion 24C of the rocker inner panel 24. Rocker inner panel 24
The upper and lower flanges 24B and 24D are joined to the upper and lower flanges 14A and 14B of the rocker portion 14 of the side member outer panel 10, respectively. A rocker 25 having a closed cross section extending in the direction is formed.

As shown in FIG. 1, the portion of the rocker inner panel 24 located inside the boundary point P1 between the straight portion 18A and the curved portion 18B of the opening flange 18 in the vehicle width direction is as follows.
The sensor mounting portion 30 is provided. This sensor mounting part 30
Then, sensor mounting holes 32 and 34 (see FIG. 2) are formed in the upper wall portion 24A of the rocker inner panel 24.
These sensor mounting holes 32 and 34 have a rocker cross section S1 perpendicular to the vehicle plane view passing through the boundary point P1, and are located before and after a cross section line L1 of the rocker cross section S1 in the upper wall portion 24A of the rocker inner panel 24. The directions are formed at substantially equal distances. Weld nuts 36 and 38 (see FIG. 2) are fixed coaxially with the sensor mounting holes 32 and 34 on the lower surface side of the upper wall portion 24A.

In the sensor mounting portion 30, the sensor mounting holes 40, 4 and 4 are formed in the side wall portion 24E of the rocker inner panel 24.
2 (see FIG. 2). These sensor mounting holes 40 and 42 are formed at a distance substantially equal to the cross section line L2 of the side wall 24E of the rocker inner panel 24 in the rocker cross section S1 in the front-rear direction. Also,
A sensor mounting hole 4 is provided on the outer side of the side wall portion 24E in the vehicle width direction.
Weld nuts 41 and 44 (see FIG. 2) are fixed coaxially with 0 and 42.

The sensor mounting portion 3 of the rocker inner panel 24
At 0, an acceleration sensor (G sensor) 46 is attached via a bracket 48.

The bracket 48 has an upper wall portion 48A and a side wall portion 48B.
It is shaped like a letter. A front flange 48C and a rear flange 48D which are one step lower than the upper wall portion 48A are formed at both front and rear ends of the upper wall portion 48A, respectively.
A front flange 48E and a rear flange 48F located outside the side wall portion 48B in the one-stage vehicle width direction are formed at both front and rear ends.

The front flange 48C and the rear flange 4
8D, the front flange 48E, and the rear flange 48F are provided with through holes 50, 52, 54, 56, respectively.
Bolts 58 are inserted into these through holes 50, 52, 54, 56, respectively, and the bolts 58 are screwed into weld nuts 36, 38, 41, 42 fixed to the side wall 24 </ b> E of the rocker inner panel 24. I agree.

Therefore, the acceleration sensor 46 is mounted at a position straddling the rocker section S1 in the vehicle longitudinal direction.

As shown in FIG. 4, front and rear cross members 60A and 62A of a front floor cross member 60 and a center floor cross member 62 are provided on both front and rear sides of the center pillar 21 of the rocker inner panel 24, respectively. Are joined.

Next, the operation of the present embodiment will be described. In the mounting structure of the sensor for side collision according to the present embodiment, as shown by an arrow A in FIG. 4, when another vehicle collides from substantially the center of the center pillar 21 in the vehicle front-rear direction, the bumper portion of the other vehicle is It collides with a relatively lower part of the center pillar 21.
For this reason, the amount of movement at the initial stage of the collision at this position (the area M1 indicated by slanting lines with a small interval in FIG.
Is larger than a region M2) indicated by oblique lines with a large interval.

It should be noted that, in FIG.
Is a region in which the movement amount is smaller than that in the region M2.

The section of the rocker 25 receives a force in the bending and torsion directions with respect to the movement of the center pillar 21, and exerts an effect on the movement of the center pillar 21. In particular, since the front floor cross member 60 and the center floor cross member 62 serve as support members for the rocker 25, the front floor cross member 60 and the center floor cross member 62
The movement amount of the rocker 25 is sharply reduced between the connecting portion and the connecting portion.
On the other hand, the cross section of the rocker 25 has substantially the same closed cross section from the front of the vehicle to the point P1, and the cross section increases sharply behind the point P1. Further, in the cross section of the rocker 25, there is a point P2 (see FIG. 6) where the cross section sharply becomes smaller on the rear side from the connection portion with the center pillar 21, contrary to the front side.

For this reason, the points P1 and P2, which are the suddenly changing sections,
, The deformation mode of the rocker 25 in a plan view becomes trapezoidal as shown by a two-dot chain line in FIG.

On the other hand, as shown by arrow B in FIG. 5, when another vehicle collides diagonally from the front, the amount of movement of the rocker 25 is determined by the fact that the bumper of the other vehicle moves in the front-rear direction of the front side door of the own vehicle. Collision with lower center. For this reason, as shown in FIG.
However, since the upper part of the rocker part 14 of the side member outer panel is pressed relatively, the cross-section of the rocker 25 is twisted in the clockwise direction of FIG. (In the direction of arrow D).

As a result, the point P1, which is a suddenly changing section, triggers the rocker 25 to break, and the amount of movement at this position (the area M1 indicated by the diagonal lines with a small gap in FIG. 5) in the initial stage of the collision is equal to the surrounding area (FIG. Area M indicated by oblique lines with a large interval in 5
2) The deformation mode of the rocker 25 in a plan view is triangular as shown by a chain line in FIG.

It should be noted that, in FIG.
Is a region in which the movement amount is smaller than that in the region M2.

Therefore, since the vicinity of the point P1 is a position where the displacement is very efficient with respect to the collision from the side and the oblique collision, the provision of the acceleration sensor 46 at this position makes it possible to detect the collision quickly.

Further, in the mounting structure of the sensor for side impact according to the present embodiment, since a cover for closing the working hole and a reinforcing member for reinforcing the cross section of the rocker, which are required in the prior art, are required at a minimum. Significant weight increase of the vehicle body can be suppressed.

In the mounting structure of the sensor for side impact according to the present embodiment, the mounting position of the acceleration sensor 46 is located near the side of the seat. Therefore, when the airbag device is mounted on the seat, the length of the harness is reduced. It can be shortened, the assemblability is improved, and the cost is reduced.

In the above, the present invention has been described in detail with respect to a specific embodiment. However, the present invention is not limited to such an embodiment, and various other embodiments are included in the scope of the present invention. It is clear to a person skilled in the art that is possible. For example, in the present embodiment, the acceleration sensor 46 is
Upper wall portion 24 of rocker inner panel 24 near boundary point P1
A, the rocker cross section S1 passing through the boundary point P1 is attached across the vehicle longitudinal direction.
The position is not limited to this position, and may be another position as long as it is near the boundary point P1.

[0039]

According to the first aspect of the present invention, there is provided a side collision sensor mounting structure, comprising: a straight portion which is an upper portion of a rocker of an opening flange formed at a front side door opening;
An acceleration sensor is mounted near the boundary between the opening flange and the curved part that is the lower front part of the center pillar, so that a significant increase in body weight can be suppressed and collision detection can be performed efficiently and quickly. Has the effect.

According to a second aspect of the present invention, there is provided the mounting structure for a side impact sensor according to the first aspect, wherein the acceleration sensor is mounted at a position higher than the center of the cross section of the rocker. There is an excellent effect that the detection performance is further improved as compared with the side collision sensor mounting structure of the present invention.

[Brief description of the drawings]

FIG. 1 is a perspective view showing a mounting structure of a sensor for side collision according to an embodiment of the present invention, as viewed obliquely from the front inside a vehicle.

FIG. 2 is an exploded perspective view showing the mounting structure of the sensor for side collision according to one embodiment of the present invention, as viewed from the obliquely front inner side of the vehicle.

FIG. 3 is a sectional view taken along line 3-3 in FIG. 1;

FIG. 4 is a perspective view showing a moving amount at the time of a collision from the side, in the mounting structure of the sensor for side collision according to one embodiment of the present invention.

FIG. 5 is a perspective view showing an amount of movement at the time of a collision from an oblique front in the mounting structure of the sensor for side collision according to one embodiment of the present invention.

FIG. 6 is a schematic plan view showing each deformation mode at the time of a collision from right beside and obliquely forward in the mounting structure of the sensor for side collision according to one embodiment of the present invention.

FIG. 7 is a sectional view showing a mounting structure of a sensor for side collision according to a conventional embodiment, as viewed from the front of a door.

FIG. 8 is a sectional view showing a mounting structure of a sensor for side collision according to another conventional embodiment, as viewed from the front of a door.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Side member outer panel 12 Center pillar part 14 Rocker part 16 Front side door opening part 18 Opening flange 18A Straight part of opening flange 18B Curved part of opening flange 21 Center pillar 24 Rocker inner panel 25 Rocker 30 Sensor mounting part 46 Acceleration sensor P1 boundary point

Claims (2)

[Claims] 1. An acceleration sensor is mounted near a boundary point between a straight portion which is a rocker upper portion of an opening flange formed at a front side door opening and a curved portion which is a front portion below a center pillar of the opening flange. A mounting structure for a side collision sensor. 2. The side impact sensor mounting structure according to claim 1, wherein said acceleration sensor is mounted at a position higher than a center of said rocker section.