JPH10129371A - Bumper reinforcement mounting structure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To return a bumper reinforcement body to an initial position when the bumper reinforcement body is elastically deformed. SOLUTION: A stepped bolt 18 erected at a bumper arm 16 is extended through the mounting hole 38 of a bumper reinforcement body 22. The part on the fastening side of a nut 20 is recessed in a disc-form manner and the inside bottom 20A thereof is brought into contact with the stepped part 18A of the stepped bolt 18. As noted above, by bringing the stepped part 18A of the stepped bolt 18 into contact with the inside bottom 20A of the nut 20, a force by which the peripheral edge part of the mounting hole 38 of a front wall part 32 is fastened against the bumper arm 16 is limited during fastening the nut 20.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a bumper reinforcement mounting structure, and more particularly to a bumper reinforcement mounting structure for mounting a bumper reinforcement body, which is curved in an arc in plan view, to a vehicle body.

[0002]

2. Description of the Related Art Conventionally, bumpers and bumper reinforcements are mounted on the front and rear portions of vehicles such as automobiles. An example of this bumper reinforcement mounting structure is shown in US Pat. No. 5,395,036. ing.

As shown in FIG. 6, in such a bumper reinforcement mounting structure, the bumper reinforcement 70 is curved in an arc shape in plan view. For this reason, when assembling the bumper reinforcement 70 to the vehicle body, at least one of the left and right mounting holes 72 and 74, in this case, the right mounting hole, in consideration of manufacturing variations of the vehicle body and the bumper reinforcement 70. 74 is a long hole whose longitudinal direction is the vehicle width direction.

[0004]

However, in such a bumper reinforcement 70 which is curved in an arc shape in plan view, the input from the vehicle front-rear direction, in this case, the input from the rear of the vehicle (FIG. 6). Arrow F),
Mounting part 7 for bumper reinforcement 70 on vehicle body
A load several times larger than the input from the vehicle front-rear direction acts on the vehicle 6 and 78 in the vehicle width direction. For this reason, the bumper reinforcement 70 is easily extended by an amount of the clearance L of the mounting hole 74. As a result, as shown in FIG. 7, the position where the end portion 74A of the mounting hole 74 abuts on the bolt 80, that is, the position of the bumper reinforcement 70 is the position indicated by the two-dot chain line in FIG.

Furthermore, even if the stroke (stroke) S of the bumper reinforcement 70 until the end 74A of the mounting hole 74 contacts the bolt 80 is within the range of elastic deformation of the bumper reinforcement 70,
Since the fastening force of the bolt 80 and the nut 82 shown in FIG. 7 exceeds the returning force of the bumper reinforcement 70, the bumper reinforcement 70 cannot return to the initial position (the solid line position in FIG. 6) and is deformed (see FIG. 6). (The position of the two-dot chain line)
This deformation cannot be ignored by design.

The present invention has been made in consideration of the above-described circumstances, and has as its object to provide a bumper reinforcement mounting structure capable of returning a bumper reinforcement body to an initial position when the bumper reinforcement body is elastically deformed.

[0007]

According to a first aspect of the present invention, there is provided a bumper reinforcement mounting structure for mounting a bumper reinforcement body curved in an arc shape in a plan view to a vehicle body, wherein the elongated hole extends in a vehicle width direction. A mounting portion of the bumper reinforcement body having a step formed therein, a stepped bolt mounted on the vehicle body side and penetrating the elongated hole, and screwed to the stepped bolt and abutted against the stepped portion of the stepped bolt, the mounting is performed. And a nut for restricting the interference force of the peripheral portion of the elongated hole.

Therefore, when the bumper reinforcement body is elastically deformed by receiving a load from the front and rear of the vehicle, the restoring force of the bumper reinforcement body exceeds the tightening force of the nut after the load stops acting. Then, the bumper reinforcement body moves toward the initial position and returns to the initial position.

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of a bumper reinforcement mounting structure of 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 inner side in the vehicle width direction.

As shown in FIG. 4, the present embodiment is a rear bumper, and includes two upper and lower weld bolts 12 attached to a right bumper arm 10 disposed near a right end in a vehicle width direction at a rear end of the vehicle. The bumper reinforcement body 22 is fixed in the vicinity of the right end in the vehicle width direction by a nut 14 screwed to the weld bolt 12.

As shown in FIG. 2, the vicinity of the left end of the bumper reinforcement body 22 in the vehicle width direction is the upper and lower sides mounted on the left bumper arm 16 disposed near the rear end of the vehicle at the rear end of the vehicle width direction. It is fixed by a stepped bolt 18 as an attachment means to two vehicle bodies and a nut 20 screwed to the stepped bolt 18. The bumper reinforcement body 22 has a working hole 23 for attaching the nut 20 to the stepped bolt 18.

As shown in FIG. 3, the bumper reinforcement main body 22 is formed by bending a single steel plate, and has closed rectangular sections 24 and 26 which are vertically separated from each other and extend in the longitudinal direction. Rear double standing walls 28, 30
The structure is connected by. Also, the joint of the steel plate
Of the double standing wall portions 28, 30, the standing wall portion 28 on the rear side of the vehicle is provided.
Is set to

The bumper reinforcement body 22 is curved in an arc shape in a longitudinal direction in a plan view, and an intermediate portion in the vehicle width direction projects rearward of the vehicle. In the vicinity of both ends in the vehicle width direction of the front wall portions 32, 34 as attachment portions for the closed cross-section portions 24, 26 of the bumper reinforcement body 22, attachment holes 3 are provided.
6, 38, 40 and 42 are drilled. Among them, the right mounting holes 36 and 40 are circular holes, and the left mounting holes 38 and 42 are long holes whose longitudinal direction is the vehicle width direction.

As shown in FIG. 4, two upper and lower bolts 12 erected on the right bumper arm 10 pass through the mounting holes 36 and 40, respectively.

As shown in FIG. 1, a stepped bolt 18 erected on the left bumper arm 16 passes through the mounting hole 38. The stepped bolt 18 has a nut 20
Is screwed. The tightening side portion of the nut 20 is recessed in a dish shape, and the inner bottom portion 20A is in contact with the step portion 18A of the stepped bolt 18. Thus, the stepped bolt 18
Abuts against the inner bottom 20A of the nut 20 so that the tightening force on the bumper arm 16 at the periphery of the mounting hole 38 of the front wall 32 when the nut 20 is tightened. I have. Preferably, the height of the stepped portion 18A of the stepped bolt 18 is in this contact state (the state of FIG. 1).
The height at which the interference K of the periphery of the mounting hole 38 by the nut 20 becomes substantially zero is set. As a result, the fastening force of the front wall portion 32 of the bumper reinforcement body 22 by the end portion 20B of the fastening side portion of the stepped bolt 18 and the nut 20 is less than the elastic deformation of the bumper reinforcement body 22 due to the collision. After the load is no longer applied, the bumper reinforcement 22 has a value that allows the main body 22 to move in the initial position direction.

The stepped bolt 1 in the mounting hole 42
The tightening of the nut 8 and the nut 20 is the same. A bumper cover 23 that covers the bumper reinforcement body 22 is provided on the rear side of the bumper reinforcement body 22 in the vehicle.

Next, the operation of the present embodiment will be described. In the present embodiment, when the central portion of the bumper reinforcement body 22 receives a load (arrow F in FIG. 4) from the rear of the vehicle,
Bumper arm 1 of bumper reinforcement body 22
A load several times larger than the input from the front-rear direction of the vehicle is applied to the mounting portions at 0 and 16 in the vehicle width direction. For this reason, the bumper reinforcement main body 22 is easily elastically deformed and extended by an amount corresponding to the relief amount of the elongated mounting holes 38 and 42. As a result, the end 38A of the mounting hole 38 or the end 42A of the mounting hole 42 moves to a position where it comes into contact with the side surface of the step 18A of the stepped bolt 18. That is, the position of the bumper reinforcement body 22 is the position indicated by the two-dot chain line in FIG.

In this case, in this embodiment, the step 18A of the stepped bolt 18 and the inner bottom 20A of the tightening side of the nut 20 abut against each other to limit the tightening force of the nut 20 (FIG. 1), the tightening force of the front walls 32, 34 of the bumper reinforcement body 22 by the end 20B of the tightening side of the stepped bolt 18 and the nut 20 indicates the elasticity of the bumper reinforcement body 22 due to the collision. The value is set so that the bumper reinforcement body 22 can be moved in the initial position direction after the load is no longer applied to the deformation. As a result, after the load F stops acting, the return force of the bumper reinforcement body 22 becomes
Overcoming the tightening force of the nut 20, the bumper reinforcement body 22 moves toward the initial position and returns to the initial position indicated by the solid line in FIG.

Therefore, in the bumper reinforcement mounting structure of the present embodiment, when the bumper reinforcement main body 22 is elastically deformed, the bumper reinforcement main body 22 can return to the initial position, and the bumper design is damaged by the elastic deformation. There is no.

In the present embodiment, when the bumper reinforcement body 22 extends, the end 3
8A and the end 42A of the mounting hole 42 are
Abuts against the side surface of the stepped portion 18A, so that the end portion 74A of the mounting hole 74 abuts on the screw portion of the bolt 80 as in the prior art (see FIG. 7), and the screw thread is not crushed. Therefore, the stroke corresponding to the thread ridge can be 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, as shown in FIG. 5, the stepped portion 18A of the stepped bolt 18 is made wider in the vehicle vertical direction as compared with the above embodiment (see FIG. 2). The mounting holes 38, 40 when the side faces abut the end 38A of the mounting hole 38 or the end 42A of the mounting hole 42
The stress concentration acting around the hole may be reduced to prevent the bumper reinforcement body 22 from being damaged.

The bumper reinforcement body 2
A washer 50 made of sponge or the like is disposed between the bumper arm 2 and the bumper arm 16 so that the bumper reinforcement body 2
Rust caused by friction between the bumper arm 2 and the bumper arm 16 may be prevented. Further, it is preferable that the washer 50 is disposed between the bumper reinforcement body 22 and the nut 20.

In this embodiment, the bumper reinforcement mounting structure of the present invention is applied to the rear bumper.
The bumper reinforcement mounting structure of the present invention is also applicable to a front bumper.

[0026]

According to the first aspect of the present invention, there is provided a bumper reinforcement mounting structure for mounting a bumper reinforcement body curved in an arc shape in a plan view to a vehicle body, wherein an elongated hole extending in a vehicle width direction is formed. The mounting part of the bumper reinforcement body, a stepped bolt attached to the vehicle body side and penetrating the long hole, and screwed to the stepped bolt and abutting on the step of the stepped bolt, Since the tightening force is restricted by the nut, there is an excellent effect that the bumper reinforcement main body can be returned to the initial position when the bumper reinforcement main body is elastically deformed.

[Brief description of the drawings]

FIG. 1 is a plan sectional view showing a bumper reinforcement mounting structure according to an embodiment of the present invention.

FIG. 2 is an exploded perspective view showing the bumper reinforcement mounting structure according to the embodiment of the present invention, as viewed from the obliquely rear inner side of the vehicle.

FIG. 3 is a perspective view showing the bumper reinforcement body of the bumper reinforcement mounting structure according to the embodiment of the present invention, as viewed obliquely from the front of the vehicle.

FIG. 4 is a plan view partially showing a cross section of the bumper reinforcement mounting structure according to the embodiment of the present invention.

FIG. 5 is an exploded perspective view showing a bumper reinforcement mounting structure according to another embodiment of the present invention, as viewed obliquely from the rear inside the vehicle.

FIG. 6 is a plan view partially showing a cross section of a bumper reinforcement mounting structure according to a conventional embodiment.

FIG. 7 is an enlarged plan sectional view showing a bumper reinforcement mounting structure according to a conventional embodiment.

[Explanation of symbols]

 Reference Signs List 16 bumper arm 18 stepped bolt 20 nut 22 bumper reinforcement body 32 front wall portion (mounting portion) 34 front wall portion (mounting portion) 40 mounting hole 42 mounting hole

Claims (1)

[Claims] 1. A bumper reinforcement mounting structure for mounting a bumper reinforcement body curved in an arc shape in a plan view to a vehicle body, the mounting portion of the bumper reinforcement body having an elongated hole extending in a vehicle width direction; A stepped bolt that is attached to the vehicle body and penetrates the elongated hole; and a threading engagement with the stepped bolt and abutment on a stepped portion of the stepped bolt limits a tightening force of a peripheral edge of the elongated hole of the attachment portion. A bumper reinforcement mounting structure, comprising: