JP2009248818A - Vehicular body front structure - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To raise the efficiency of absorbing impact energy by using an extension member for joining a bumper and a vehicular frame. <P>SOLUTION: In a vehicular body front structure provided with a front bulkhead 17 between the bumper 24 and a subframe 23, a side member 21 of the front bulkhead 17 is provided with a through-hole 28 into which a lower impact-absorbing member 26 is inserted as the extension member of an auxiliary bumper-beam 24c. The impact energy can be absorbed over the whole length of the lower impact-absorbing member 26 so as to increase the absorbed amount of the impact energy and enable high efficient transmission of an impact load. In addition, the degradation of strength and rigidity due to the through-hole 28 provided in the side member 21 can be prevented because an edge of the through-hole 28 is formed with tongue pieces extending in a penetration direction. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a vehicle body front structure having a front bulkhead disposed at the rear end of a bumper at the front end of the vehicle body.

Conventionally, in a vehicle body front part structure, a pair of left and right front side frames are provided so as to extend along the left and right side surfaces at the front part of the vehicle body. It is connected via a front bulkhead. Further, a bumper that receives a bumper reinforcement for absorbing impact energy is provided at the front end of the vehicle body. (For example, refer to Patent Document 1).
JP 2006-76455 A

  In the thing of the said patent document 1, the auxiliary bumper reinforcement is arrange | positioned under the bumper. Furthermore, in order to prevent the auxiliary bumper reinforcement from riding on a member (rocker) that extends to the lower side of the opponent vehicle when it collides with the side of the opponent vehicle, A second member extending rearward of the vehicle body is provided in a downwardly sloping manner toward the front side of the vehicle body.

  The fixing position of the second member to the subframe is located at the rear of the vehicle body with respect to the radiator support to which the radiator is attached. The second member includes a radiator support lower that supports the vertical column of the radiator support and the lower end of the radiator. Are provided in a state of being sandwiched from above and below, and are coupled to those members. Therefore, since the second member is coupled to the upper and lower body frame members at the intermediate portion, there is a problem that it is difficult to be crushed at the time of a collision and it is difficult to increase the absorption efficiency of the collision energy.

  In order to solve such problems and to improve the absorption efficiency of the collision energy by the extension member that couples the bumper and the vehicle body frame, in the present invention, the bumper is provided at the front end of the vehicle body (1). (24) A vehicle body front portion structure having a front bulkhead (21) disposed at the rear of the vehicle body, wherein the front bulkhead (21) extends in the vertical direction of the vehicle body (1) and is A side member (21) having a rectangular closed cross section having both side wall portions (21a, 21b). The bumper (24) extends rearward from the bumper beam (24c) to the vehicle body frame (23). A through hole (2) having an extension member (26) to be coupled, and through which the extension member (26) penetrates the both wall portions (21a, 21b) of the side member (21). ), And the edge of the through hole (28) extends in the penetrating direction of the extension member (26) in the part around the through hole (28) in the wall portions (21a, 21b). The tongue pieces (29a and 29b) formed in the above are assumed to be formed.

  In particular, the tongue pieces (29a, 29b) are preferably formed by burring.

  According to the first aspect of the present invention, by providing the through-hole through which the bumper beam extension member penetrates in the side member of the front bulkhead, the collision energy can be absorbed over the entire length of the extension member. As a result, the collision load can be transmitted with high efficiency. In addition, since the edge of the through hole is formed by a tongue piece extending in the penetrating direction, it is possible to prevent a decrease in strength and rigidity due to the provision of the through hole in the side member.

  According to the second aspect, by forming the tongue piece by burring, it is possible to easily perform the process of providing the tongue piece in the through hole, and the manufacturing cost for realizing the above structure can be reduced.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a perspective view of a main part of a front body structure of an automobile to which the present invention is applied as viewed obliquely from the front.

  In the vehicle body front structure shown in FIG. 1, a pair of left and right front side frames that extend in the front-rear direction of the vehicle body at intervals in the left-right direction at the front portion of the vehicle body 1 as a skeleton strength member of the vehicle body front portion 11 and 12, left and right members 15 and 16 extending from the left and right front pillars 13 and 14 to the vicinity of the upper front end of the left and right front side frames 11 and 12, and the front side of the left and right front side frames 11 and 12 The front bulkhead 17 is coupled to and supported by the end portions and the vehicle body front end portions of the left and right members 15 and 16, and an engine room 18 is defined inside these.

  Each of the skeleton strength members as the vehicle body part structure may have a rectangular closed cross section formed of, for example, a U-shaped cross-section member and a plate-like lid-shaped member, and this shape is used as the skeleton strength member of the vehicle body. Since it is publicly known, its detailed description is omitted. Further, left and right wheel houses 19 and 20 for front wheels are provided in a space defined by the left and right members 15 and 16 and the left and right front side frames 11 and 12.

  The front bulkhead 17 is formed in a shape having a rectangular frame portion facing the front of the vehicle body, and the left and right side members 21. 22 is coupled to the front end portions of the front side frames 11 and 12 at an intermediate portion. Upper and lower cross members 17a and 17b extending in the vehicle body width direction in the vehicle body vertical direction constituting the frame portion of the front bulkhead 17 are provided. The upper cross member 17a includes left and right side members. The left and right rearward extending portions 17c and 17d extending from the upper left and right corners of the frame portion that is the upper end of the vehicle body 21 and 22 to the left and right members 15 and 16 extend, and the left and right rearward extending portions 17c The rear end of 17d is connected to the front ends of the left and right members 15 and 16. The upper cross member 17a and the left and right rear extending portions 17c and 17d are bent so as to have a U-shape expanded rearward of the vehicle body in plan view, and the left and right side members are formed at the left and right corners. The upper ends of 21 and 22 are joined.

  A sub frame 23 constituting a vehicle body frame is disposed below the left and right front side frames 11 and 12 and corresponding to the lower surface of the engine room 18. An engine (not shown) is mounted on the subframe 23.

  FIG. 2 is a left side view of the main part of the vehicle body front structure as seen from the arrow II line in FIG. The vehicle body front portion structure is bilaterally symmetric. Hereinafter, the left side portion of the vehicle body front portion will be described unless otherwise specified.

  A bumper 24 is disposed in front of the front bulkhead 17 as shown in FIG. The bumper 24 forms an outer surface of the vehicle body 1 and extends in the vehicle body width direction at a concave bumper cover 24a opened to the front bulkhead 17 side, and on the upper and lower portions inside the bumper cover 24a. The main bumper beam 24b received as described above and the auxiliary bumper beam 24c as the bumper beam in the present invention are configured.

  The main bumper beam 24b and the auxiliary bumper beam 24c integrally have an upper impact absorbing member 25 and a lower impact absorbing member 26 as an extension member that extend rearward of the vehicle body in the vicinity of the left and right ends in the vehicle width direction. Yes. Each of the shock absorbing members 25 and 26 may be formed in a rectangular closed cross-sectional shape in the same manner as the above-described skeleton strength member. The rear end of the vehicle body of the upper shock absorbing member 25 is coupled to the side member 21 and is provided coaxially with the front side frame 11.

  The auxiliary bumper beam 24c is inserted into each through hole 28 provided at the lower part of each of the left and right side members 21 and 22 in a state where the lower impact absorbing member 26 is integrated as shown by a two-dot chain line in FIG. The lower shock absorbing member 26 is passed through and assembled. As shown in FIG. 3, the lower impact absorbing member 26 is penetrated through the side member 21, and the rear end of the vehicle body is coupled to the front end of the sub frame 23 by a through bolt 27.

  The through hole 28 is formed by burring the bottom wall portion 21a of the U-shaped cross-section member as the vehicle body front side wall portion of the side member 21 and the lid-like member 21b as the vehicle body rear side wall portion from the vehicle body front side. Has been. By the burring process, tongue pieces 29a and 29b are formed in the bottom wall portion 21a and the lid-like member 21b so as to extend in the longitudinal direction of the vehicle body. The tongue pieces 29a and 29b are penetrated by the tongue pieces 29a and 29b. An edge of the hole 28 is formed. Thereby, even if the through hole 28 is provided in the side member 21, the cross-sectional area is minimized and the maximum strength is obtained, and the edge portion is strengthened. The The formation of the tongue pieces 29a and 29b is not limited to the burring process. However, the formation of the tongue pieces 29a and 29b is easy by the burring process, and the manufacturing cost for providing the tongue pieces 29a and 29b can be reduced. .

  Since the lower impact absorbing member 26 is provided in this way, even if the front bulkhead 17 is disposed between the bumper 31 and the subframe 23, the lower impact is penetrated through the side member 21. By providing the absorbing member 26, the entire length L of the lower impact absorbing member 26 can be increased. Since the lower impact absorbing member 26 can be deformed over its entire length L due to the load F at the time of collision, the amount of collision energy absorbed can be increased.

It is the principal part perspective view which looked at the vehicle body front part structure of the motor vehicle to which this invention was applied from diagonally forward. FIG. 2 is an enlarged side view of a main part of a front part of a vehicle body as seen from the arrow II line in FIG. 1. It is sectional drawing seen along the arrow III-III line of FIG.

Explanation of symbols

1 Car body 21 Front bulkhead 21a Bottom wall part (wall part)
21b Lid member (wall)
23 Subframe (body frame)
24 Bumper 24c Auxiliary bumper beam (bumper beam)
26 Lower impact absorbing member (extension member)
28 Through-hole 29a / 29b Tongue piece

Claims (2)

A vehicle body front structure having a front bulkhead arranged at the rear end of the bumper at the front end of the vehicle body,
The front bulkhead includes a side member having a rectangular closed cross-sectional shape extending in the vertical direction of the vehicle body and having both wall portions on the vehicle body front-rear side,
The bumper has an extension member that extends from the bumper beam to the rear of the vehicle body and is coupled to the vehicle body frame,
A through hole through which the extension member passes is provided in the both wall portions of the side member,
The vehicle body front structure characterized in that an edge of the through hole is formed by a tongue piece formed so that a portion around the through hole in the both wall portions extends in a direction through which the extension member passes. .   The vehicle body front structure according to claim 1, wherein the tongue piece is formed by burring.

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