Vehicle rear part structure

Abstract

To provide a vehicle rear part structure that can efficiently transmit a load at the time of a rear end collision.SOLUTION: A vehicle rear part structure S includes a vehicle rear framework member 18 that is integrally formed by casting. The vehicle rear framework member 18 includes a pair of right and left rear wheel arches 42 and a pair of right and left rear side members 40. The rear side member 40 includes a side wall portion 40A, an upper wall portion 40B, and a lower wall portion 40C. The rear side member 40 further includes first ribs 41A that protrude from the lower wall portion 40C toward the vehicle lower side, and a second rib 41B that protrudes outward in a vehicle width direction from the side wall portion 40A.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a vehicle rear structure. [Background technology]

[0002] Patent Document 1 discloses a vehicle front structure that efficiently absorbs load energy in the inclined portions of the front side members when a load is input from the front, while suppressing the amount of deformation of the inclined portions and suppressing the amount of cabin setback. The front side members included in this vehicle front structure are provided with ribs. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Laid-Open No. 2004-224251 Summary of the Invention [Problem to be solved by the invention]

[0004] An object of the present invention is to provide a vehicle rear structure that can efficiently transfer load during a rear collision. [Means for solving the problem]

[0005] The vehicle rear structure described in claim 1 is a vehicle rear structure including a vehicle rear skeletal member integrally formed by casting, the vehicle rear skeletal member including a pair of left and right rear wheel arches and a pair of left and right rear side members extending in the fore-and-aft direction of the vehicle, the rear side members including side wall portions whose thickness direction is in the vehicle width direction, an upper wall portion extending outward in the vehicle width direction from the side wall portions and whose thickness direction is in the vehicle vertical direction, a lower wall portion extending outward in the vehicle width direction from the side wall portions and whose thickness direction is in the vehicle vertical direction, a first rib protruding from the lower wall portion toward the bottom of the vehicle, and a second rib protruding outward in the vehicle width direction from the side wall portions.

[0006] In claim 1, the vehicle rear structure includes a vehicle rear frame member integrally formed by casting. The vehicle rear frame member includes a pair of left and right rear wheel arches and a pair of left and right rear side members extending in the vehicle longitudinal direction. The rear side members include side wall portions whose thickness direction is in the vehicle width direction, an upper wall portion that extends from the side wall portions outward in the vehicle width direction and whose thickness direction is in the vehicle vertical direction, and a lower wall portion that extends from the side wall portions outward in the vehicle width direction and whose thickness direction is in the vehicle vertical direction.

[0007] During a rear-end collision, out-of-plane deformation occurs in each wall portion constituting the rear side member, which may result in a decrease in the efficiency of transmission of the collision load. Therefore, in claim 1, the rear side member further includes a first rib protruding downward from the lower wall portion of the vehicle, and a second rib protruding outward in the vehicle width direction from the side wall portion. Therefore, the first rib and the second rib can suppress out-of-plane deformation of the lower wall portion and the side wall portion of the rear side member, thereby improving the efficiency of load transmission during a rear-end collision. [Effects of the Invention]

[0008] As described above, according to the present invention, a vehicle rear structure capable of efficiently transmitting load during a rear collision can be obtained. [Brief explanation of the drawings]

[0009] [Figure 1] 1 is a cross-sectional view (cross-sectional view taken along line 1-1 in FIG. 2) showing a part of the vehicle rear frame member. [Figure 2] FIG. 2 is a perspective view of a vehicle rear frame member. DETAILED DESCRIPTION OF THE INVENTION

[0010] Hereinafter, a vehicle rear structure according to an embodiment will be described with reference to FIGS.

[0011] In addition, the arrow FR shown as appropriate in each drawing indicates the front of the vehicle, the arrow UP indicates the top of the vehicle, the arrow RH indicates the right side in the vehicle width direction, and the arrow OUT indicates the outside in the vehicle width direction. Furthermore, in the following explanation, when the front-rear, up-down, and left-right directions are used unless otherwise specified, they refer to front-rear in the front-rear direction of the vehicle, up-down in the up-down direction of the vehicle, and left-right in the vehicle width direction.

[0012] 2, the vehicle rear structure S includes a vehicle rear frame member 18. The vehicle rear frame member 18 is integrally formed by casting. Specifically, the vehicle rear frame member 18 is integrally formed by die casting using an aluminum alloy, a magnesium alloy, or the like.

[0013] The vehicle rear frame member 18 includes a pair of left and right rear wheel arches 42 and a pair of left and right rear side members 40 extending in the vehicle longitudinal direction. The vehicle rear frame member 18 also includes a connecting portion 44 that connects the pair of left and right rear side members 40 in the vehicle width direction.

[0014] As shown in FIG. 1 , the rear side member 40 includes a side wall portion 40A whose thickness direction is oriented in the vehicle width direction, an upper wall portion 40B whose thickness direction is oriented in the vehicle vertical direction, and a lower wall portion 40C whose thickness direction is oriented in the vehicle vertical direction. The upper wall portion 40B extends outward in the vehicle width direction from an upper end of the side wall portion 40A. The lower wall portion 40C extends outward in the vehicle width direction from near the lower end of the side wall portion 40A. In other words, the side wall portion 40A, the upper wall portion 40B, and the lower wall portion 40C form the rear side member 40, which is a substantially U-shaped (or substantially C-shaped) framework member that is open outward in the vehicle width direction. Note that, in FIG. 1 , the portion of the upper wall portion 40B extending upward from the outer end of the vehicle width direction is connected to a rear wheel arch 42.

[0015] The rear side member 40 also includes a plurality of (five in FIG. 1) first ribs 41A that protrude downward from the lower wall portion 40C of the vehicle. The first ribs 41A extend in the direction in which the rear side member 40 extends (generally in the longitudinal direction of the vehicle).

[0016] The rear side member 40 also includes a second rib 41B that protrudes outward in the vehicle width direction from the side wall portion 40A. The second rib 41B extends in the direction in which the rear side member 40 extends (generally in the front-rear direction of the vehicle).

[0017] The extension direction of the rear side member 40 is generally in the vehicle longitudinal direction. However, specifically, the rear side member 40 partially extends in a direction inclined relative to the vehicle longitudinal direction. For this reason, although not shown in the drawings, for example, the portion of the rear side member 40 corresponding to the rear wheel arch 42 (the portion that overlaps in the vehicle longitudinal direction) is located higher on the vehicle than the other portions. Furthermore, the portion of the rear side member 40 corresponding to the rear wheel arch 42 is located more inward in the vehicle width direction than the other portions.

[0018] The rear side member 40 also includes reinforcing portions 40D and 40E. The reinforcing portions 40D and 40E include a second lower wall portion 40D extending inward in the vehicle width direction from the lower end of the side wall portion 40A of the rear side member 40, and a second side wall portion 40E extending upward in the vehicle direction from the inner end of the second lower wall portion 40D. The side wall portion 40A, the second lower wall portion 40D, and the second side wall portion 40E form a frame member having a generally U-shaped cross section that is open toward the upper side of the vehicle. The space inside this generally U-shaped cross section is used to arrange electric wires such as a wire harness. The reinforcing portions 40D and 40E are not provided over the entire range from the front end to the rear end of the vehicle rear frame member 18, but are provided in a portion corresponding to the rear wheel arch 42. Therefore, the rear side member 40 is reinforced by the reinforcing portions 40D and 40E in the portion corresponding to the rear wheel arch 42. The rear side member 40 also includes a plurality of (four in FIG. 1) third ribs 41C that protrude downward from the second lower wall portion 40D of the vehicle.

[0019] <Action and effect> Next, the effects of this embodiment will be described.

[0020] In this embodiment, as shown in Fig. 2, the vehicle rear structure S includes a vehicle rear framework member 18 that is integrally formed by casting. The vehicle rear framework member 18 includes a pair of left and right rear wheel arches 42 and a pair of left and right rear side members 40 that extend in the vehicle longitudinal direction. As shown in Fig. 1, the rear side member 40 includes a side wall portion 40A whose thickness direction is oriented in the vehicle width direction, an upper wall portion 40B that extends outward in the vehicle width direction from the side wall portion 40A and whose thickness direction is oriented in the vehicle vertical direction, and a lower wall portion 40C that extends outward in the vehicle width direction from the side wall portion 40A and whose thickness direction is oriented in the vehicle vertical direction.

[0021] During a rear-end collision, out-of-plane deformation occurs in each of the wall portions 40A, 40B, and 40C that constitute the rear side member 40, which may result in a decrease in the efficiency of transmission of the collision load. Therefore, in this embodiment, the rear side member 40 further includes a first rib 41A protruding downward from the lower wall portion 40C of the vehicle, and a second rib 41B protruding outward in the vehicle width direction from the side wall portion 40A. Therefore, the first rib 41A and the second rib 41B can suppress out-of-plane deformation of the lower wall portion 40C and the side wall portion 40A of the rear side member 40, thereby improving the efficiency of load transmission during a rear-end collision.

[0022] Since the vehicle rear frame member 18 is integrally formed by casting, it is easy to provide the first rib 41A, the second rib 41B, etc. It is also easy to provide the reinforcing portions 40D, 40E that reinforce parts of the main body portion (side wall portion 40A, upper wall portion 40B, and lower wall portion 40C) of the rear side member 40.

[0023] In the above embodiment, the rear side member 40 includes the reinforcing portions 40D, 40E, but the rear side member of the present disclosure does not necessarily need to include reinforcing portions.

[0024] In the above embodiment, the lower wall portion 40C extends outward in the vehicle width direction from near the lower end of the side wall portion 40A, but the lower wall portion of the present disclosure may extend outward in the vehicle width direction from the lower end of the side wall portion 40A. [Explanation of symbols]

[0025] S Vehicle rear structure 18 Rear vehicle frame member 40 Rear side member 40A side wall 40B Upper wall part 40C Lower wall part 41A First Rib 41B Second Rib 42 Rear wheel arch

Claims

[Claim 1] A vehicle rear structure including a vehicle rear frame member integrally formed by casting, The vehicle rear framework member includes: A pair of left and right rear wheel arches, a pair of left and right rear side members extending in the vehicle longitudinal direction; Equipped with The rear side member a side wall portion whose thickness direction is oriented in the vehicle width direction; an upper wall portion extending outward in a vehicle width direction from the side wall portion and having a thickness direction directed in a vehicle up-down direction; a lower wall portion extending outward in a vehicle width direction from the side wall portion and having a thickness direction directed in a vehicle up-down direction; a first rib protruding from the lower wall portion toward a vehicle lower side; a second rib protruding outward in the vehicle width direction from the side wall portion; Equipped with Vehicle rear structure.

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