JP2006224728A - Bumper reinforcement structure for vehicle with frame - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a bumper reinforcement structure for a vehicle with a frame capable of suppressing both increase in the mass of the vehicle, and expanding a pressure receiving area of a collision load at the time of head-on collision. <P>SOLUTION: The bumper reinforcement 22 connecting front end portions of right and left front side frames 12 is provided with an overhang portion 22A. Therefore, the pressure receiving area at the time of head-on collision is expanded. On the other hand, of the overhang portion 22A, a part exceeding a point abutting on a mount bracket 14 at the time of the head-on collision, does not contribute to load transmission to the front side frames 12, so that, a plane cross-section shape thereof is reduced. Therefore, the mass of not only the bumper reinforcement 22, but also the vehicle is reduced. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a bumper reinforcement structure for a vehicle with a frame including a pair of left and right front side frames, a bumper reinforcement, and a mount bracket.

  Patent Document 1 below discloses a technique for connecting a front mount bracket provided on the outside of a side frame and a longitudinal end of a front cross member with a band member in a vehicle with a frame.

According to the above configuration, when a frontal collision occurs, depending on the collision object, the front end bracket of the side frame may not be axially compressed and deformed, and the front mount bracket may be deformed to the vehicle rear side. Accordingly, the longitudinal ends of the front mount bracket and the front cross member are connected by a band member to suppress the displacement of the front mount bracket that tends to be deformed rearward due to a collision load.
JP 2002-205622 A

  However, according to the above prior art, since the front end of the side frame is joined to the longitudinal end of the front cross member, there is a problem that the pressure receiving area of the front cross member that receives the load in the event of a frontal collision is small. is there.

  On the other hand, in order to increase the pressure receiving area, it is only necessary to lengthen the longitudinal dimension of the bumper reinforcement that receives a collision load in the case of a frontal collision, but simply increasing the length of the bumper reinforcement extending outward in the vehicle width direction This causes another problem that the mass of the vehicle body also increases.

  In view of the above facts, the present invention has an object to obtain a bumper reinforcement structure for a vehicle with a frame that can achieve both suppression of an increase in vehicle mass and expansion of a pressure receiving area with respect to a collision load when a frontal collision occurs. .

  The bumper reinforcement structure for a vehicle with a frame according to the first aspect of the present invention includes a pair of left and right front side frames disposed on both sides of the front portion of the vehicle body with the longitudinal direction of the vehicle as a longitudinal direction, and the front side frames of these front side frames. The span is longer than the distance between the front ends, spans between the front ends of the front side frame, and has a protruding portion that protrudes outward in the vehicle width direction from the front end of the front side frame of the bumper reinforcement. A bumper applied to a vehicle with a frame configured to include a scale-shaped bumper reinforcement and a mounting bracket that protrudes outward in the vehicle width direction from the outer surface on the front end side of each front side frame and supports the body. Reinforcement structure with bumper reinforcement in plan view From the first line passing through the rear surface of the front and the second line passing through the outer side of the front side frame, the intersection of both is obtained, and the contact point on the mounting bracket is obtained by drawing a tangent line from the intersection to the mounting bracket. The distance from the contact point to the contact point is obtained, and the length of the bumper reinforcement overhang portion is made to substantially match the distance, or the end portion of the overhang portion of the overhang portion that exceeds the distance from the intersection is flat. The cross-sectional shape is reduced more than the flat cross-sectional shape of the general part.

  According to the first aspect of the present invention, when a frontal collision occurs, the collision load at that time is input to the bumper reinforcement and then transmitted to the pair of left and right front side members.

  Here, the span length of the bumper reinforcement is set to be longer than the distance between the front end portions of the pair of left and right front side frames, and has a projecting portion that projects outward from the front end portion of the front side frame in the vehicle width direction. Therefore, the pressure receiving area with respect to the collision load at the time of frontal collision is expanded.

  However, although the pressure receiving area is increased by providing the bumper reinforcement on the bumper reinforcement, the vehicle mass increases accordingly.

  However, in the present invention, the intersection of both is obtained from the first line passing through the rear surface of the bumper reinforcement and the second line passing through the outer surface of the front side frame in a plan view of the vehicle, and a tangent line is drawn from the intersection to the mounting bracket. The contact point on the mounting bracket is obtained, and the distance from the intersection point to the contact point is obtained, and the length of the bumper reinforcement overhanging portion is made substantially equal to the distance, or at the overhanging portion from the intersection point. Since the flat cross-sectional shape of the end portion of the overhanging portion exceeding the distance is made smaller than the flat cross-sectional shape of the general portion, the mass of bumper reinforcement, and hence the vehicle mass, is reduced.

  That is, when a frontal collision occurs, the overhanging portion is deformed (bent) while drawing an arc whose radius is the distance from the intersection to the contact point, and contacts (interferences) the mount bracket. As a result, the collision load received by the overhanging portion provided for expanding the pressure receiving area is transmitted to the front side frame via the mount bracket (the load flows from the front side frame to the vehicle rear side). Therefore, the function required for the overhanging portion is satisfied. On top of that, the length of the overhang of bumper reinforcement is made to substantially match the distance, or the flat cross-sectional shape of the end of the overhang is made smaller than the flat cross-sectional shape of the general part. The mass of the non-contributing part can be eliminated or reduced.

  As described above, the bumper reinforcement structure for a vehicle with a frame according to the first aspect of the present invention has the first line passing through the rear surface of the bumper reinforcement and the second surface passing through the outer surface of the front side frame in a plan view of the vehicle. Find the intersection of the two from the line, draw a tangent line from the intersection to the mount bracket, find the contact point on the mount bracket, determine the distance from the intersection point to the contact point, and the length of the bumper reinforcement overhang The flat cross-sectional shape of the end of the overhanging portion that exceeds the distance from the intersection at the overhanging portion is reduced more than the flat cross-sectional shape of the general portion, so that the overhanging portion is Although it is provided, it contributes to the load transmission to the front side frame in the event of a frontal collision at the overhang. And it can not be or reducing eliminate mass parts to exhibit excellent effect that it is possible to achieve both the expansion of the pressure receiving area to the collision load at the time of suppressing the frontal collision of the increased vehicle mass.

[First Embodiment]
Hereinafter, a first embodiment of a bumper reinforcement structure for a vehicle with a frame according to the present invention will be described with reference to FIG. In addition, the arrow FR shown in FIG. 1 has shown the vehicle front side, and the arrow OUT has shown the vehicle width direction outer side.

  FIG. 1 shows an enlarged plan view of a main part of a bumper reinforcement structure for a vehicle with a frame according to the present embodiment. As shown in this figure, a pair of left and right front side frames 12 are disposed on both sides of the vehicle body front portion 10 with the vehicle longitudinal direction as the longitudinal direction (only one side is shown in FIG. 1). A mounting bracket 14 for mounting and supporting the body is attached to the outer surface of the front end portion of each front side frame 12 so as to project outward in the vehicle width direction.

  A cylindrical crush box 16 is coaxially disposed at the front end portion of the front side frame 12 and fixed with bolts 18 and nuts 20. Between the front end portions of the left and right crash boxes 16, a high-strength bumper reinforcement 22 constituting a part of the front bumper is stretched. The bumper reinforcement 22 is formed in a long shape and is arranged with the vehicle width direction as a longitudinal direction. The span length of the bumper reinforcement 22 is set to be longer than the distance between the left and right crash boxes 16. Accordingly, both end portions of the bumper reinforcement 22 in the longitudinal direction protrude beyond the crash box 16 in the vehicle width direction. Hereinafter, this portion is referred to as “an overhang portion 22A”.

  Here, in the present embodiment, the flat cross-sectional shape of the end 22A ′ of the overhang portion 22A of the bumper reinforcement 22 is tapered more than the flat cross-sectional shape of the general portion 22B of the bumper reinforcement 22 (in a vehicle plan view). The flat cross-sectional shape is reduced).

  The flat cross-sectional shape of the end portion 22A ′ of the overhang portion 22A of the bumper reinforcement 22 will be described in detail. The first line P passing through the rear surface of the bumper reinforcement 22 and the front side frame 12 (crash box 16) outside the vehicle plan view. The intersection point A of the two is obtained from the second line Q passing through the side surface, and the contact point B on the mount bracket 14 is obtained by drawing the tangent line R from the intersection point A to the mount bracket 14, and further from the intersection point A to the contact point B. Find the distance r. Then, in the overhanging portion 22A, the flat portion of the end 22A ′ (the range of the hatched portion S) that exceeds the position B ′ that is the distance r ′ (= r) from the intersection A (outside the position B ′). The cross-sectional shape is reduced by tapering the flat shape of the general portion 22B.

(Operation and effect of this embodiment)
Next, the operation and effect of this embodiment will be described.

  When a frontal collision occurs, the collision load at that time is input to the bumper reinforcement 22 and then transmitted to the pair of left and right front side frames 12.

  Here, the span length of the bumper reinforcement 22 is set to be longer than the distance between the crash boxes 16 arranged at the front end portions of the pair of left and right front side frames 12, and projects from the crash box 16 outward in the vehicle width direction. Since the overhanging portion 22A is provided, the pressure receiving area with respect to the collision load at the time of a frontal collision is enlarged.

  However, although the pressure receiving area is increased by providing the overhanging portion 22A on the bumper reinforcement 22, the vehicle mass increases accordingly.

  However, in the present embodiment, the intersection point A is obtained from the first line P passing through the rear surface of the bumper reinforcement 22 and the second line Q passing through the outer side surface of the front side frame 12 in the vehicle plan view. Then, a contact line B on the mount bracket 14 is obtained by drawing a tangent line R from the mount bracket 14, and a distance r from the intersection point A to the contact point B is obtained. From the intersection point A at the overhanging portion 22 A of the bumper reinforcement 22 Since the planar cross-sectional shape of the end portion 22A ′ beyond the position B ′ where the distance r is taken is made smaller than the planar cross-sectional shape of the general portion 22B, the mass of the bumper reinforcement 22 and thus the vehicle mass is reduced.

  That is, when a frontal collision occurs, the overhanging portion 22A is deformed (bent) while drawing an arc having a radius r centering on the intersection A, and abuts (interferes) with the mount bracket 14 at the contact B. As a result, the collision load received by the overhanging portion 22A provided for expanding the pressure receiving area is transmitted to the front side frame 12 via the mount bracket 14 (the load flows from the front side frame 12 to the vehicle rear side). Therefore, the function required for the overhanging portion 22A is satisfied. In addition, since the flat cross-sectional shape of the end portion 22A ′ of the overhang portion 22A of the bumper reinforcement 22 is reduced more than the flat cross-sectional shape of the general portion 22B, the mass of the portion that does not contribute to load transmission can be reduced. .

  In addition, if it supplements about the energy absorption at the time of a frontal collision, when a frontal collision and a collision load are input into the bumper reinforcement 22, the left and right crash boxes 16 undergo axial compression plastic deformation. Thereby, predetermined energy absorption is performed. Moreover, predetermined energy absorption is also performed when the overhanging portion 22A of the bumper reinforcement 22 bends toward the vehicle rear side with the intersection A as the center.

  As a result, according to the bumper reinforcement structure for a vehicle with a frame according to the present embodiment, it is possible to achieve both suppression of an increase in vehicle mass and expansion of a pressure receiving area with respect to a collision load when a frontal collision occurs.

  In the present embodiment, the flat cross-sectional shape of the end portion 22A ′ of the overhang portion 22A of the bumper reinforcement 22 is tapered to reduce the flat cross-sectional shape from the flat cross-sectional shape of the general portion 22B. However, the present invention is not limited to this, and the flat cross-sectional shape of the end portion of the projecting portion of the end portion may be made smaller than the flat cross-sectional shape of the general portion by making the shape of the end portion substantially semicircular.

[Second Embodiment]
Next, a second embodiment of the bumper reinforcement structure for a vehicle with a frame according to the present invention will be described with reference to FIG. In addition, about the same component as 1st Embodiment mentioned above, the same number is attached | subjected and the description is abbreviate | omitted.

  As shown in FIG. 2, in the second embodiment, the length of the overhanging portion 30A of the bumper reinforcement 30 substantially matches the distance r ′ obtained from the intersection A by the method described in the first embodiment. There is a feature in the point made. That is, the second embodiment is characterized in that a portion corresponding to the end portion 22A 'which is tapered in the first embodiment is cut.

  Also with the above configuration, the same operations and effects as those of the first embodiment described above can be obtained.

  That is, since the bumper reinforcement 30 of the present embodiment also includes the overhang portion 30A, the pressure receiving area with respect to the collision load at the time of a frontal collision is expanded.

  In addition, an intersection A between the first line P passing through the rear surface of the bumper reinforcement 30 and the second line Q passing through the outer side surface of the front side frame 12 is obtained in plan view of the vehicle, and from the intersection A to the mounting bracket 14. The contact point B on the mount bracket 14 is obtained by drawing the tangent line R, and the distance r from the intersection point A to the contact point B is obtained, and the length of the overhanging portion 30A of the bumper reinforcement 30 matches the distance r. Since r ′, the overhanging portion 30A bends around the intersection A when a frontal collision occurs, interferes with the mount bracket 14, and can transmit a load to the front side frame 12. Therefore, the function required for the overhang portion 30A is satisfied. In addition, the mass of the portion that does not contribute to load transmission in the overhang portion 30A can be eliminated. Accordingly, the mass of the bumper reinforcement 30 and thus the vehicle mass is reduced. As a result, also in this embodiment, it is possible to achieve both suppression of increase in vehicle mass and expansion of the pressure receiving area with respect to a collision load when a frontal collision occurs.

  Furthermore, in the case of the present embodiment, since the portion corresponding to the end portion 22A ′ of the first embodiment does not exist in the overhang portion 30A of the bumper reinforcement 30, the vehicle mass can be further reduced.

  In the present embodiment, the portion exceeding the distance r ′ from the intersection A is cut, but even if the distance r ′ is slightly exceeded, it can be regarded as a missing portion that is not substantially provided intentionally. What is understood to be substantially the same as the configuration of the second embodiment is included in the present invention.

[Supplementary explanation of the embodiment]
In the first embodiment and the second embodiment described above, the crash box 16 is disposed at the front end portion of the front side frame 12. However, the present invention is not limited thereto, and the front end portion of the front side frame is omitted by omitting the crash box 16. May be directly connected to the bumper reinforcement. In the case of the first embodiment and the second embodiment, both the front side frame 12 and the crash box 16 correspond to the “front side frame” of the present invention.

  In the first embodiment described above, the end portion 22A ′ of the overhang portion 22A of the bumper reinforcement 22 is left while reducing the flat cross-sectional shape. In the second embodiment, the overhang portion 30A of the bumper reinforcement 30 is left. Although the configuration is set such that the minimum length r ′ (= r) is set, the overhanging portions 22A and 30A bend toward the vehicle rear side around the intersection point A, thereby interfering with the mount bracket 14 and causing the front side frame 12 to If the function of transmitting the load is secured and the end portion of the overhang portion that does not contribute to the load transmission is eliminated or the shape of the end portion is reduced, it is included in the present invention.

It is a principal part enlarged plan view of the bumper reinforcement structure of the vehicle with a frame which concerns on 1st Embodiment. It is a principal part enlarged plan view of the bumper reinforcement structure of the vehicle with a frame which concerns on 2nd Embodiment.

Explanation of symbols

10 Car body front part 12 Front side frame 14 Mount bracket 16 Crash box (front side frame)
22 bumper reinforcement 22A overhang 22A 'end 22B general part 30 bumper reinforcement 30A overhang P 1st line Q 2nd line A intersection R tangent B contact r distance

Claims (1)

A pair of left and right front side frames arranged with the longitudinal direction of the vehicle in the longitudinal direction on both sides of the front of the vehicle body;
The span length is longer than the distance between the front end portions of these front side frames, and spans between the front end portions of the front side frames, and projects outward from the front end portion of the front side frame of the bumper reinforcement in the vehicle width direction. A long bumper reinforcement with an overhang,
A mounting bracket that extends outward from the outer surface of the front end side of each front side frame in the vehicle width direction and supports the body;
A bumper reinforcement structure applied to a vehicle with a frame configured to include:
In the vehicle plan view, the intersection of both is obtained from the first line passing through the rear surface of the bumper reinforcement and the second line passing through the outer surface of the front side frame, and the contact point on the mounting bracket is drawn from the intersection to the mounting bracket. Further, the distance from the intersection point to the contact point is obtained, and the length of the bumper reinforcement overhang portion is substantially equal to the distance, or the overhang portion of the overhang portion that exceeds the distance from the intersection point is determined. The flat cross-sectional shape of the end of the part is reduced more than the flat cross-sectional shape of the general part,
A bumper reinforcement structure for vehicles with frames.

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