JP2019038301A - Body structure - Google Patents

Abstract

To provide a body structure capable of sufficiently absorbing a buffer load even when a bracket for mounting other components on a side rail is joined.SOLUTION: The body structure includes: a side rail 12 extending in the cross direction of a vehicle body; a bracket 20 fixed on an outer wall of the side rail 12 and having a mounting hole 26 for mounting other components. Weak parts (an inner weak part 34 and an outer weak part 36) are mounted on the side rail 12 along such a direction as to cross the side rail 12 from the mounting hole 26, and a thin wall part 46 is mounted on the bracket 20.SELECTED DRAWING: Figure 3

Description

  The present invention relates to a vehicle body structure of an automobile, and more particularly, to a vehicle body structure that can improve occupant protection performance in a collision.

  Conventionally, with regard to the body structure of an automobile, a weak body part that is partially different in strength and rigidity is formed on a pair of left and right side rails that extend in the front-rear direction of the vehicle body, and the collision load is absorbed by the weak body part during a collision. The occupant protection performance has been improved.

  In Patent Document 1, a weak portion (notch) is provided in a frame extending in the front-rear direction below the rear portion of the floor panel of the vehicle body and a sub-frame disposed in the frame so as to be used in a rear collision. A vehicle body structure is disclosed in which the frame and the sub-frame are bent at the position of the weak body portion to improve the occupant protection performance.

Japanese Patent Laid-Open No. 5-112254

  When a bracket for attaching other parts is joined to the position (weak body) where the side rail is to be deformed at the time of a collision, when the collision load is applied, the deformation mode of the side rail is not stable and the collision load is sufficiently absorbed. There is a risk that it will not be.

  An object of the present invention is to provide a vehicle body structure that can sufficiently absorb a collision load even when a bracket for attaching other components to a side rail is joined.

  The vehicle body structure of the present invention is a vehicle body structure including a side rail extending in the front-rear direction of the vehicle body, and a bracket having a mounting hole that is fixed to the outer wall of the side rail and mounts other parts. The side rail is provided with a weak portion along the direction crossing the side rail, and the bracket is provided with a thin portion along the direction.

  According to the present invention, since the weak portion is provided on the side rail and the thin portion is provided on the bracket along the direction crossing the side rail from the mounting hole of the bracket, the bracket is easily deformed at the time of collision. The deformation of the side rail is not hindered and the collision load can be absorbed sufficiently.

It is a top view which shows a vehicle body frame. It is a perspective view which shows the side rail of the state which removed the cab mount bracket. It is a perspective view which shows the side rail of the state which attached the cab mount bracket.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

  FIG. 1 is a plan view showing a vehicle body frame located at the lower part of the vehicle body of the present embodiment. In FIG. 1, the arrow Fr indicates the front direction of the vehicle body, the arrow Up indicates the upward direction of the vehicle body, and the arrow Lh indicates the left direction of the vehicle body. The same applies to FIGS. As shown in FIG. 1, the vehicle body structure 10 of this embodiment includes a pair of side rails 12 extending in the vehicle longitudinal direction on both sides in the vehicle body width direction, a plurality of cross members 14 a to 14 e, and a pair of engine mount brackets 16. And two suspension mount brackets 18 and a plurality of cab mount brackets 20.

  As shown in FIG. 1, the pair of left and right side rails 12 are connected by a plurality of cross members 14a to 14e extending in the vehicle width direction, thereby forming a substantially ladder-like body frame. The side rail 12 includes bent portions 22a and 22b that are bent outward in the vehicle width direction toward the rear side of the vehicle body, and bent portions 24a and 24b that are bent inward in the vehicle width direction toward the rear side of the vehicle body.

  Between the cross member 14a and the cross member 14b on the front side of the side rail 12, a pair of metal engine mount brackets 16 projecting inward in the vehicle width direction from the inner wall of the side rail 12 are provided. An engine mount (not shown) is attached to the pair of engine mount brackets 16, and an engine unit (not shown) is coupled to the side rail 12 via the engine mount and the pair of engine mount brackets 16.

  Further, between the cross member 14 a and the cross member 14 b on the front side of the side rail 12, two metal suspension mount brackets 18 projecting outward from the outer wall of the side rail 12 in the vehicle width direction are provided. A suspension mount (not shown) is attached to each of the two suspension mount brackets 18, and a suspension unit (not shown) is connected to the side rail 12 via the suspension mount and the suspension mount bracket 18.

  In the vicinity of the bent portions 22a, 22b, 24a, and 24b of the side rail 12, a metal cab mount bracket 20 that is fixed (joined) to the outer wall of the side rail 12 and projects outward in the vehicle width direction is provided. Yes. Thereby, the vehicle body structure 10 of the present embodiment has four cab mount brackets 20. The cab mount bracket 20 may be provided at each of the bent portions 22a, 22b, 24a, 24b of the side rail 12.

  The cab mount bracket 20 has a mounting hole 26. In each of the four cab mount brackets 20, rubber mounts (not shown) are attached to the attachment holes 26. A cab (body, not shown) is connected to the side rail 12 via four rubber mounts and four cab mount brackets 20.

  Here, the side rail 12 and the cab mount bracket 20 will be described in more detail. Hereinafter, the cab mount bracket 20 is simply referred to as a bracket 20 as appropriate. FIG. 2 is an enlarged view of a portion surrounded by a broken line in FIG. 1, and is a perspective view of the side rail 12 with the cab mount bracket 20 removed, as viewed from the outside of the vehicle body. FIG. 3 is an enlarged view of a portion surrounded by a broken line in FIG. 1, and is a perspective view of the side rail 12 with the cab mount bracket 20 attached as viewed from the inside of the vehicle body.

  As shown in FIG. 2, the side rail 12 is configured by joining an outer channel 30 positioned on the outer side in the vehicle width direction and an inner channel 32 positioned on the inner side in the vehicle width direction. The outer channel 30 and the inner channel 32 are made of, for example, a metal material such as a steel material having a substantially U-shaped cross-sectional shape in a cross section in the vehicle width direction. And the outer channel 30 and the inner channel 32 are joined so that the open part of this U-shaped cross section may mutually oppose, and the side rail 12 which has a hollow closed cross section as a whole is comprised.

  As shown in FIGS. 2 and 3, a concave portion (inner weak body portion 34) is provided in the upper portion of the inner wall of the side rail 12, and a concave portion (outer weak body portion 36) is also provided in the upper portion of the outer wall. . The inner weak body portion 34 and the outer weak body portion 36 are provided along a direction (left-right direction) crossing the side rail 12. The vehicle body structure 10 of the present embodiment has a structure in which collision energy is absorbed when the side rail 12 is deformed from the inner weak body portion 34 and the outer weak body portion 36 of the side rail 12 at the time of a front collision or a rear collision. It is.

  As shown in FIG. 3, the cab mount bracket 20 is fixed to the outer wall of the side rail 12 at the position of the outer weak body portion 36 described above, and a part of the cab mount bracket 20 protrudes from the upper surface of the side rail 12 to be exposed to the outer weak body portion 36. Covers a part of A portion of the cab mount bracket 20 that covers the outer weak body portion 36 of the side rail 12 has a shape that rises upward, a notch 40 in which a part of the edge is notched, and an inclined portion around the notch 40. 42. The inclined portion 42 is a portion inclined from the flat portion 48 toward the notch 40. The notch 40 of the cab mount bracket 20 constitutes a thin portion 46, and the thin portion 46 functions as a fragile portion. In the present embodiment, in addition to the notch 40 (thin portion 46) of the cab mount bracket 20, the inclined portion 42 also functions as a fragile portion. For example, the inclined portion 42 may include a portion that becomes thin at the starting point inclined from the flat portion 48. As shown in FIG. 3, a thin portion 46 is provided in the bracket 20 along the direction (left-right direction) crossing the side rail 12 from the mounting hole 26 of the bracket 20, and a weak body portion (outer weak body portion) is formed on the outer wall of the side rail 12. 36) And the weak part (inner weak part 34) is provided in the inner wall of the side rail 12. FIG.

  Although one cab mount bracket 20 on the left rear side of the vehicle body has been described here, the other cab mount bracket 20 and the side rail 12 to which it is fixed have the same structure.

  Next, the effect of the vehicle body structure 10 of this embodiment is demonstrated.

  In the vehicle body structure 10 of the present embodiment, when a collision load is applied to the side rail 12 due to a front collision or a rear collision, the side rail 12 is deformed starting from the inner weak body portion 34 and the outer weak body portion 36 of the side rail 12. . At that time, the bracket 20 is also deformed starting from the thin portion 46. Therefore, even if the bracket 20 is fixed at a position aligned with the inner weak body portion 34 and the outer weak body portion 36 of the side rail 12 in the vehicle width direction, the deformation of the side rail 12 is not hindered and the collision load is sufficiently increased. Can be absorbed. Thereby, occupant protection performance can be enhanced.

  In particular, in the vehicle body structure 10 of the present embodiment, the thin portion 46 and the mounting hole 26 of the bracket 20 and the inner weak body portion 34 and the outer weak body portion 36 of the side rail are located side by side in a direction crossing the side rail 12. The bracket 20 can be easily deformed when a collision load is applied. In other words, the thin portion 46 and the attachment hole 26 of the bracket 20 and the inner weak portion 34 and the outer weak portion 36 of the side rail 12 are arranged in the vehicle width direction, so that the thin portion 46 of the bracket 20 extends from the attachment hole 26. The bracket 20 can be easily deformed by concentrating the stress. Therefore, the side rail 12 is sufficiently deformed and the collision load can be effectively absorbed.

  In the vehicle body structure 10 of the embodiment described above, the inner weak body portion 34 and the outer weak body portion 36 are provided on the side rail 12, but only one of the weak body portions may be provided. Moreover, although the notch 40 and the inclination part 42 were provided in the bracket 20, only the notch 40 or only the inclination part 42 may be provided.

  DESCRIPTION OF SYMBOLS 10 Car body structure, 12 Side rail, 14a-14e Cross member, 16 Engine mount bracket, 18 Suspension mount bracket, 20 Bracket (cab mount bracket), 22a, 22b, 24a, 24b Bending part, 26 Mounting hole, 30 Outer channel, 32 inner channel, 34 weak body part (inner weak body part), 36 weak body part (outer weak body part), 40 notch, 42 inclined part, 46 thin part, 48 flat part.

Claims (1)

A vehicle body structure including a side rail extending in the front-rear direction of the vehicle body and a bracket having a mounting hole that is fixed to the outer wall of the side rail and attaches other components,
Along the direction crossing the side rail from the mounting hole, the side rail is provided with a weak portion, and further along the direction, the bracket is provided with a thin portion,
Body structure characterized by that.

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