JP3312412B2 - Attachment structure of the bumper reinforce of the car to the body side member - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a structure for attaching a bumper reinforcement of an automobile, particularly a passenger car, to a vehicle body-side member such as a front side member or a bumper arm extending from the front side member.

[0002]

2. Description of the Related Art As shown in FIG. 4A, as a reinforcing material for a bumper of a passenger car, that is, a bumper reinforcement 10, an intermediate portion 11 extending in a lateral direction of a vehicle body and an intermediate portion 1 are provided.
End portions 12 extending outward from the respective ends of the vehicle body in the lateral direction of the vehicle body and toward the center in the front-rear direction of the vehicle body, that is, backward in the front bumper reinforcement, and forward in the rear bumper reinforcement. The bumper reinforcement is attached to a front side member 13 or a bumper arm 14, which is a member on the vehicle body side, at an end portion 12 thereof (Japanese Utility Model Laid-Open No. 3-45252).

[0003]

When the bumper reinforcement 10 receives a load F from, for example, a wall 15, FIG.
B, the end portion 12 is first deformed so as to be on the extension of the intermediate portion 11, and accordingly, the rotational moment toward the outside A in the lateral direction of the vehicle body is changed.
Join 3 Therefore, it is necessary to take measures such as increasing the thickness of the front side member 13 or adding a reinforcing component so that the front side member 13 can withstand the rotational moment, which increases the weight.

An object of the present invention is to provide a mounting structure of a vehicle bumper reinforcement to a vehicle body-side member capable of coping with a rotational moment applied to the vehicle body-side member without increasing the weight of the vehicle body-side member. Is to do.

[0005]

SUMMARY OF THE INVENTION The present invention is directed to an intermediate portion extending in a lateral direction of a vehicle body and an end portion extending from each end of the intermediate portion outward in the lateral direction of the vehicle body and toward the center in the front-rear direction of the vehicle body. And a bumper reinforce attached to a vehicle body-side member extending in the front-rear direction of the vehicle body at each side of the vehicle body, wherein the bumper reinforce is attached to the vehicle body-side member at the end portion. And a vertical extension of the vehicle body on a substantial extension of a laterally inner edge of the body-side member.
Vulnerability consisting of through holes or machined parts oriented in the direction
With parts .

[0006]

[Operation and effect] When the bumper reinforce receives a horizontal load, a rotational moment in the lateral direction is applied to the members on the vehicle body side, but at the same time, the bumper reinforce is crushed at the fragile portion. , The members on the vehicle body side
, A rotational moment directed inward in the lateral direction is generated, and both rotational moments cancel each other.

This is a measure only to provide a fragile portion in the bumper reinforcement, and no measures are taken for the members on the vehicle body side, so that the weight of the members on the vehicle body side does not increase.

After the bumper reinforcement has been crushed by the fragile portion, the vehicle body-side members receive substantially only the load directed in the front-rear direction of the vehicle body, and can effectively receive the load by compressive deformation.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS As shown in FIGS. 1 and 2, the present invention has a structure in which a bumper reinforcement 20 is attached to a member 22 on the vehicle body side.

The bumper reinforcement 20 includes an intermediate portion 24 extending in the lateral direction of the vehicle body, and an end portion 25 extending from each end of the intermediate portion 24 outward in the lateral direction of the vehicle body and toward the center in the front-rear direction of the vehicle body. And Determining the shape of the bumper reinforcement 20 in a plan view as described above is mainly due to design restrictions, but as a result, the above-described problem occurs.

In the embodiment shown in FIG. 2, the bumper reinforcement 20 is for the front, and the end portions 25 extend rearward in the front-rear direction of the vehicle body from the respective ends of the intermediate portion 24.
Alternatively, if the bumper reinforcement 20 is for the rear, the end portion 25 extends forward from each end of the intermediate portion 24. The bumper reinforcement 20 includes two members 26 each having a U-shaped cross section. The flanges 27 provided at the open ends of the respective members 26 are abutted and spot-welded to form a rigid member having a closed cross-sectional space. . The closed section space extends from the intermediate portion 24 to two end portions 25 (only one end portion is shown in FIG. 1).

The bumper reinforcement 20 includes a vehicle body-side member 22 extending in the front-rear direction of the vehicle body on each side of the vehicle body.
Attached to.

In the illustrated embodiment, the member 22 on the vehicle body side comprises:
The bumper arm extends from the front side member 30. The bumper arm 22 is formed to bend the plate material to define a closed sectional space, and further has a mounting surface 23 at a front end. The rear end of the bumper arm 22 is fitted to a front side member 30 formed by bending a plate material to define a closed sectional space, and spot welding. Thereby, the bumper arm 22 and the front side member 30 are connected. On the other hand, the rear member 26 of the two members of the bumper reinforcement 20 is attached to the mounting surface 23 of the bumper arm 22 by the bolt 32 and the nut 34.
And then abut the two members 26 and spot weld to the flange 27 to form the bumper reinforcement 20.

The bumper reinforcement 20 has an end portion 2
By attaching 5 to the member 22 on the vehicle body side, it is supported by the member 22 on the vehicle body side. The coupling of the end portion 25 to the vehicle body-side member 22 is mainly based on the necessity of securing a space for the engine in the engine room. The bumper reinforcement 20 is, when attached to the vehicle body-side member 22, a fragile portion 3 located on a substantially extension of the lateral inner edge 36 of the vehicle body-side member 22.
8

In the embodiment shown, a through hole 40 having a center is formed on the extension of the inner edge 36, and a weak portion 38 is formed. As shown in FIG. 2, the through holes 40 can be provided in only one of the upper and lower pieces of the bumper reinforcement 20, as shown in FIG. The thickness of the bumper reinforce can also be partially cut to be thinner to make it weaker. The size or thickness of the hole is determined so that the overall rigidity of the bumper reinforcement 20 is not substantially affected.

The bumper reinforce 20 is attached to the member 22 on the vehicle body side, and the bumper cover 42 containing the cushion material is attached to the bumper reinforce 20. In this case, as shown by an imaginary line in FIG. 2, the mounting piece 44 protrudes from the flange 27 of the front member 26 forming the bumper reinforcement 20, and can be mounted using a bolt and a nut by using this.

When the bumper reinforce 20 is not subjected to a horizontal load , the weakened portion 38 of the bumper reinforce 20 is in the state of FIG. However, when the bumper reinforcement 20 receives a horizontal load , the member 22 on the vehicle body side
Or 30 as shown in FIG.
, But at the same time, the bumper reinforcement 20 collapses at its weakened portion 38,
As a result, a rotational moment directed inward in the lateral direction B is generated, and both rotational moments cancel each other. As a result, a longitudinal load is applied to the members 22 and 30 on the vehicle body side.

If a weak portion is provided by forming a through hole in the bumper reinforcement as in the above embodiment, the bumper reinforcement can be easily formed. Also, when the bumper reinforcement is an extruded aluminum product, it can be applied to different types of vehicles simply by changing the position or size of the through-hole. The force can be manufactured, and the manufacturing cost can be reduced.

[Brief description of the drawings]

FIG. 1 is a plan view of a mounting structure of a bumper reinforce of an automobile to a member on a vehicle body side according to the present invention, in which a bumper reinforce shows a portion located on one side.

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

FIG. 3 is a plan view schematically showing a mounting structure of a bumper reinforcement of a vehicle according to the present invention to a member on a vehicle body side, where a is a state where no load is received, and b is a state where a load is received. ing.

FIG. 4 is a plan view schematically showing a conventional mounting structure of a bumper reinforcement, where a is a state where no load is applied, and b is a state where no load is applied.
Indicates a state under load.

[Explanation of symbols]

 Reference Signs List 20 bumper reinforcement 22 body-side member (bumper arm) 24 intermediate portion 25 end portion 36 inner edge 38 weak portion

Claims (1)

(57) [Claims] 1. A bumper reinforcement having an intermediate portion extending in a lateral direction of a vehicle body and an end portion extending from each end of the intermediate portion outward in a lateral direction of the vehicle body and toward a center in a longitudinal direction of the vehicle body. A structure attached to a vehicle body-side member extending in the front-rear direction of the vehicle body at each side of the vehicle body, wherein the bumper reinforcement is attached to the vehicle body-side member at the end portion; On a substantial extension of the lateral inner edge, there is a through-hole oriented vertically in the bodywork.
Or a structure for mounting a bumper reinforce of an automobile on a vehicle body-side member having a fragile portion formed of a cut portion .