JPH0585402A - Shock absorbing frame of vehicle - Google Patents

Abstract

PURPOSE:To provide a shock absorbing frame of a vehicle which can generate the stable compression deformation in the axis direction and can secure rigidity. CONSTITUTION:A shock absorbing frame is arranged on each side part in the transverse direction of a vehicle and absorbs a shock through deformation in collision. This frame 10 is formed to a closed sectional shape from an inner channel 12 and an outer channel 14. Each of the inner channel 12 and outer channel 14 has a plurality of holes 18 which are arranged in two tows, keeping an interval in the vertical direction and keeping an interval in the longitudinal direction, in each front part.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vehicle frame which is deformed at the time of a collision and absorbs the shock.

[0002]

2. Description of the Related Art A vertical piece and a pair of horizontal pieces extending from the upper and lower ends of the vertical piece are provided as frames that are arranged on each side of the vehicle in the lateral direction and that are deformed in a collision and absorb the shock.
It has been proposed that a plurality of holes spaced in the front-rear direction are arranged in a line on the central axis of the vertical piece of the channel having a U-shaped cross section (Japanese Utility Model Laid-Open No. 56-113073). ).

[0003]

Since the frame according to the above-mentioned proposal has a U-shaped cross section, there is a difference in strength between the vertical piece and the opening, that is, the outside and inside of the frame. is there. Further, when viewed from the outside of the frame, the strength of the corner portion, which is the connecting portion between the vertical piece of the frame and the pair of horizontal pieces, is higher than the strength of the vertical piece.
As described above, since the strength distribution in the cross section of the frame is unbalanced, it is difficult to cause stable axial compressive deformation of the frame when a shock is applied.

If the strength of the corner portion is reduced and the resistance force is reduced, the compressive deformation can be further stabilized. However, in order to reduce the strength of the corner portion, it is necessary to increase the diameter of the plurality of holes arranged in the one row. When the diameter of the holes is increased, the ratio of the area of the holes to the vertical piece of the frame is increased. It becomes large and the rigidity of the frame decreases.

Therefore, an object of the present invention is to provide a shock absorbing frame for a vehicle which can generate stable axial compressive deformation and ensure rigidity.

[0006]

SUMMARY OF THE INVENTION The present invention is a frame which is arranged on each lateral portion of a vehicle and which deforms and absorbs impact in the event of a collision. This frame is formed in a closed cross-sectional shape by an inner channel and an outer channel. Each of the inner channel and the outer channel has a plurality of holes arranged in two rows at intervals in the vertical direction and spaced at intervals in the front-rear direction at the front portion of each.

[0007] In a preferred aspect of the present invention, the plurality of holes in the upper row are formed such that the diameters of the holes are gradually reduced toward the rear and the center of each hole is formed from the upper surface of the frame. Are arranged such that the difference between the distance to and the radius of the hole is approximately equal for all holes.
Further, the plurality of holes in the lower row are formed so that the diameters of the holes gradually decrease toward the rear, and the distance from the lower surface of the frame to the center of each hole and the radius of the hole. Are arranged so that the difference between and is almost equal for all holes.

[0008]

[Operation and Effect] The frame is formed by the inner channel and the outer channel to have a closed cross-sectional shape, and a plurality of holes in two rows are provided at the front of each of the inner channel and the outer channel. Therefore, the intensity distribution inside and outside the frame is substantially symmetrical. Further, since each of the inner channel and the outer channel is provided with a plurality of holes in upper and lower two rows, the strength of the corner portion can be reduced. For these reasons, stable axial compressive deformation can be generated in the frame.

Since the inner channel and the outer channel are each provided with a plurality of holes in upper and lower two rows, a plurality of holes in the upper row are provided near the upper corner portion and a plurality of holes in the lower row are provided below. Can be arranged near the corner of the. According to this arrangement, since the strength of the corner portion can be reduced by the hole having a small diameter, the ratio of the area of the hole occupied by the vertical pieces of the inner channel and the outer channel is reduced, and the decrease in rigidity can be suppressed.

In a preferred embodiment, the upper and lower two rows of holes are formed so that the diameters of the holes gradually decrease toward the rear, so that at the time of collision, the frame is seated in order from the front hole. You can bend. Further, since the holes in the upper row are located at substantially the same position from the upper surface and the holes in the lower row are located at substantially the same position from the lower surface, it is possible to reduce the corner strength substantially uniformly. it can.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS As shown in FIG. 3, a frame 10 is disposed on each side portion of a vehicle in the lateral direction, and is designed to deform and absorb the impact at the time of a collision. Equipped with. The left frame 10 and the right frame 10 are connected to each other by a front cross member 16.

The inner channel 12 and the outer channel 14 are both formed in a groove shape. As shown in FIG. 2, one opening side is inserted into the other opening and welded to form a frame 10 having a closed cross section. Is becoming

In the embodiment shown in FIG. 2, the inner channel 12 has a vertical piece 13a and two horizontal pieces 13b,
The outer channel 14 has a vertical piece 15a and two horizontal pieces 15b. The outer channel 14 is called a side rail, and its horizontal piece 15b is formed to be shorter than the horizontal piece 13a of the inner channel 12. Inner channel 12 and outer channel 1
4 can be formed with the same plate thickness and the same material, for example, a hot rolled steel plate.

Each of the inner channel 12 and the outer channel 14 has a plurality of holes 18 at the front portion thereof, which are arranged in two rows at intervals in the vertical direction and are spaced at intervals in the front-rear direction. .. These holes 18
Are so-called crush holes, which facilitate the buckling deformation of the frame 10 at these holes. In the illustrated embodiment, there are four holes 18 in each row.

The holes 18 have the same diameter, and the straight line connecting the centers of the holes in each row is the central axis C of the frame 10.
Although it may be arranged so as to be parallel to, the embodiment shown in FIG. 1 is preferable.

In FIG. 1, the plurality of holes 18 in the upper row A are formed so that the diameters of the holes are gradually reduced rearward, and the upper surface 11 of the frame 10 is formed.
It is arranged so that the difference between the distance from a to the center of each hole and the radius of the hole is substantially equal for all holes. For example, the distance from the surface 11a above the center of the first hole is D1, the radius of the hole is R1, the distance from the surface 11a above the center of the second hole is D2, and the radius of the hole is R2. Then, (D1
−R1) and (D2-R2) are substantially equal. As a result, the distance D from the upper surface 11a of the frame 10 to the upper end of each hole 18 is substantially constant.

In the structure shown in FIG. 1, the plurality of holes 18 in the lower row B are further arranged such that the diameters of the holes are gradually reduced toward the rear and the lower surface 11 of the frame 10 is made smaller.
The holes are arranged so that the difference between the distance from b to the center of each hole and the radius of the hole is substantially equal for all holes. As a result, the distance E from the lower surface 11b of the frame 10 to the lower end of each hole 18 is substantially constant. Normally, the distance D and the distance E are equal.

The apertures of the plurality of holes 18 in the upper row A and the lower row B are arranged so that the area of the holes decreases by 2 to 5% in order from the front one toward the rear. Establish. By doing so, when the frame 10 receives an impact, the frame 10 will buckle and deform in order from the front side.

In each row, the hole in the front of the plurality of holes 18 is defined as the front cross member 16 and the frame 10.
It is preferable to arrange it at a position rearward of the joint portion 17 for coupling with. This can prevent the joint portion 17 from being deformed at the initial stage of the collision. The second and subsequent holes of the plurality of holes 18 are arranged at a constant pitch P. Here, as shown in FIG. 2, the pitch P is given by P = {(a + b) / 2} × (1.1 to 1.3), where the height of the frame 10 is a and the width is b. You can

A bracket for a stabilizer, a bracket for a bevel gear for steering, and other parts are attached to the frame 10, and these parts are provided with a plurality of holes 1
It is preferable to form a bolt hole at a position of the frame 10 that is substantially in the middle of the front-rear direction pitch P of 8 and to connect the bolts. When the parts are attached to the frame 10 by welding, the frame is prevented from being compressed and deformed in the axial direction when an impact is received, but the bolt connection can surely perform the compressive deformation. Further, when the hook 20 is attached to the frame 10, it is preferable to form the hook 20 into a shape that is easily deformed and attach the hook 20 directly below the frame 10.

Next, specific numerical examples will be shown. Frame 1
0 inner channel 12 and outer channel 14
Are made of SHP38 with a plate thickness of 3.6 mm, and a is 95 mm,
b was 60 mm and the pitch P was 85 mm. The diameter of the first hole is 25mm, the second one is 23mm, the third one is 21mm,
And the fourth one is 19mm. As a result, the cross-sectional area of the third hole from the front is about 20 times smaller than that of the first hole.
%is decreasing. When a shock was applied to the frame thus formed, it exhibited the characteristics shown in FIG. 4a. On the other hand, the one having no crash hole has the characteristics shown in FIG. As is clear from the figure, in the above-mentioned specific example, it is found that a substantially constant deformation stroke occurs with a substantially constant load. This indicates that the strength of the corner portion of the frame was reduced by a substantially constant amount.

[Brief description of drawings]

FIG. 1 is a side view of a frame according to the present invention.

FIG. 2 is a sectional view taken along line 2-2 of FIG.

FIG. 3 is a perspective view showing a state in which the frame according to the present invention is attached to a vehicle.

4A and 4B show load characteristics of a deformation stroke, where a is a specific example of the present invention and b is a hole not provided.

[Explanation of symbols]

 10 frame 12 inner channel 14 outer channel 18 holes

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Makoto Iwata 100 Kanayama, Ichiriyama-cho, Kariya city, Aichi Toyota Auto Body Co., Ltd.

Claims (2)

[Claims] 1. A frame which is arranged on each side portion of a vehicle in a lateral direction and which is deformed at the time of collision and absorbs the shock, and is formed in a closed cross-sectional shape by an inner channel and an outer channel. And each of the outer channels is a shock absorbing frame of a vehicle having a plurality of holes in front of each of which are arranged in two rows at intervals in the vertical direction and are spaced at intervals in the front-rear direction. 2. The plurality of holes in the upper row are formed such that the diameters of the holes are gradually reduced toward the rear, and the distance from the upper surface of the frame to the center of each hole and The holes are arranged so that the difference from the radius of the holes is substantially equal for all the holes, and the plurality of holes in the lower row are formed so that the diameters of the holes are gradually reduced toward the rear, and the frame is formed. The vehicle shock absorbing frame according to claim 1, wherein the shock absorbing frame is arranged so that a difference between a distance from the lower surface to the center of each hole and a radius of the hole is substantially equal for all holes.