JP2019199221A - Vehicle body front part structure - Google Patents

Abstract

To obtain a vehicle body front part structure which can effectively support a collision load from a front side member.SOLUTION: A front part 10C of a vehicle body 10 to which a vehicle body front part structure is applied includes a pair of left and right front side members 30 each extending in a vehicle fore and aft direction and having a first rib 30E extending in a vehicle horizontal direction therein. Further, the front part 10C of the vehicle body 10 includes a dash cross member 20 which extends in a vehicle width direction at the vehicle rear relative to the pair of left and right front side members 30, is connected with the pair of left and right front side members 30, and has a second rib 20D, which extends in the vehicle horizontal direction on an extension in a direction in which the first rib 30E extends, therein.SELECTED DRAWING: Figure 4

Description

  The present invention relates to a vehicle body front structure.

  Patent Document 1 below discloses a vehicle body front structure (vehicle body structure of an automobile) that achieves both the securing of rigidity of a floor panel and a reduction in vehicle body reaction force at the time of a vehicle longitudinal collision. In the front part of the vehicle body described in this document, a front side member and a dash cross member are connected, and this dash cross member is connected to a tunnel portion of the floor panel. Thus, when a collision load in the vehicle front-rear direction is input to the front side member, the collision load is transmitted from the front side member to the tunnel portion of the floor panel via the dash cross member.

JP 2001-225766 A

  By the way, it may be difficult to provide a tunnel part in a floor panel with the structure by which mounted objects, such as a battery, are arrange | positioned along the floor panel of a vehicle body like an electric vehicle. In this case, it may be difficult to effectively support the collision load from the front side member.

  In view of the above facts, an object of the present invention is to obtain a vehicle body front structure capable of effectively supporting a collision load from a front side member.

The vehicle body front structure according to claim 1 includes a pair of left and right front side members having a first rib extending in the vehicle horizontal direction and extending in the vehicle front-rear direction at a front portion of the vehicle body,
The second pair of left and right front side members extend in the vehicle width direction on the vehicle rear side and are connected to the pair of left and right front side members, and extend in the vehicle horizontal direction on the extension in the direction in which the first rib extends. And a dash cross member having a rib.

  When a collision load in the vehicle front-rear direction due to a frontal collision or the like is input to the front portion of the vehicle body to which the vehicle body front structure according to claim 1 is applied, the collision load is transmitted from the front side member to the dash cross member. . Here, a first rib is provided inside the front side member, and a second rib is provided inside the dash cross member. And the 2nd rib inside a dash cross member is provided on extension of the 1st rib inside a front side member. Thereby, the collision load from the part in which the 1st rib was provided in the front side member can be effectively supported in the part in which the 2nd rib was provided in the dash cross member.

  The vehicle body front part structure according to the present invention has an excellent effect that it can effectively support a collision load from the front side member.

It is a top view which shows the vehicle body of this embodiment. It is sectional drawing which shows the cross section of the front side member etc. which were cut | disconnected along the 2-2 line shown by FIG. FIG. 3 is a cross-sectional view showing a cross section of a dash cross member or the like cut along line 3-3 shown in FIG. 1. FIG. 4 is a cross-sectional view showing a cross section of a dash cross member or the like cut along line 4-4 shown in FIG. 1. It is a top view which shows typically the front part of the vehicle body of this embodiment, and has shown the state before a collision. It is a top view which shows typically the front part of the vehicle body of this embodiment, and has shown the state at the time of a collision.

  A vehicle body front structure according to an embodiment of the present invention will be described with reference to FIGS. Note that an arrow FR appropriately shown in each drawing indicates a vehicle front-rear direction front side, an arrow UP indicates a vehicle vertical direction upper side, an arrow RH indicates a vehicle width direction right side, and an arrow LH indicates The left side in the vehicle width direction is shown. In addition, hereinafter, when simply using front and rear, left and right, and up and down directions, unless otherwise specified, front and rear in the vehicle front and rear direction, left and right in the vehicle left and right direction (vehicle width direction), and up and down in the vehicle up and down direction And

  FIG. 1 shows a vehicle body 10 to which the vehicle body front structure of the present embodiment is applied. A pair of left and right rockers 12 that are spaced apart in the left-right direction and extend in the front-rear direction are provided in the intermediate portion 10A in the front-rear direction of the vehicle body 10. The rocker 12 has a closed cross-sectional shape in a cross-sectional view cut along a direction (vertical and horizontal directions) orthogonal to the longitudinal direction, thereby constituting a part of the skeleton on both sides of the vehicle body 10. Yes. The left and right rockers 12 are joined to both ends in the left-right direction of a floor panel 14 constituting the floor surface of the passenger compartment (cabin). Here, the floor panel 14 of the present embodiment is not formed with a tunnel portion for avoiding a drive shaft, an exhaust pipe or the like. Thereby, the part between the left and right rockers 12 in the floor panel 14 is substantially flat. A plurality of beads 14 </ b> A for ensuring rigidity are formed in a portion between the left and right rockers 12 in the floor panel 14. Further, a battery 16 (see FIG. 3) as a mounted object is attached to the lower side of the floor panel 14. A plurality of cross members 18 are bridged between the left and right rockers 12. Both ends in the left-right direction of the plurality of cross members 18 are joined to the left and right rockers 12, respectively. A dash cross member 20 is bridged between the front end portions of the left and right rockers 12, and both end portions in the left and right direction of the dash cross member 20 are respectively joined to the front end portions of the left and right rockers 12.

  The rear portion 10B of the vehicle body 10 is provided with a pair of left and right rear side members 22 that are spaced apart in the left-right direction and extend in the front-rear direction. The rear side member 22 forms a part of the skeleton of the rear portion 10B of the vehicle body 10 by having a closed cross-sectional shape in a cross-sectional view cut along a direction (vertical and horizontal directions) orthogonal to the longitudinal direction. ing. The left and right rear side members 22 are joined to both ends in the left-right direction of the rear panel 24 constituting the floor of the cargo compartment. Further, a cross member 18 is bridged between the left and right rear side members 22, and both ends in the left and right direction of the cross member 18 are joined to the left and right rear side members 22, respectively. The left and right rear side members 22 are joined to a rear suspension tower 26 that supports a part of a rear suspension (not shown). Further, rear bumper reinforcements 28 are attached to rear end portions of the left and right rear side members 22.

  The front portion 10C of the vehicle body 10 is provided with a pair of left and right front side members 30 that are spaced apart in the left-right direction and extend in the front-rear direction. A suspension member 32 that supports a lower arm (not shown) and the like is attached to the pair of left and right front side members 30 and a front suspension tower 34 that supports a part of the front suspension is joined. Further, front bumper reinforcements 36 are attached to the front end portions of the left and right front side members 30. The rear end portions of the left and right front side members 30 are joined to the dash cross member 20. As shown in FIG. 4, the rear end sides of the left and right front side members 30 are joined to the floor panel 14 and a dash panel 40 described later via the front side member rear 38.

  Next, detailed configurations of the front side member 30 and the dash cross member 20 will be described.

  As shown in FIG. 2, the front side member 30 has a closed cross-sectional shape in a cross-sectional view cut along a direction (vertical and horizontal directions) orthogonal to the longitudinal direction thereof, so that the front portion of the vehicle body 10 is It constitutes part of the 10C skeleton. Since the right front side member 30 and the left front side member 30 are configured symmetrically in the vehicle width direction, the right front side member 30 will be described below. Description is omitted.

  The front side member 30 is formed by subjecting an aluminum alloy material to extrusion processing or the like. The front side member 30 has an outer wall portion 30A extending in the front-rear direction with the vehicle width direction as a thickness direction, and an inner wall portion 30B disposed on the inner side in the vehicle width direction with respect to the outer wall portion 30A and extending substantially parallel to the outer wall portion 30A. And. Further, the front side member 30 extends in the front-rear direction with the vertical direction as the thickness direction, and connects the upper end of the outer wall portion 30A and the upper end of the inner wall portion 30B in the vehicle width direction, and substantially parallel to the upper wall portion 30C. And a lower wall portion 30D that connects the lower end of the outer wall portion 30A and the lower end of the inner wall portion 30B in the vehicle width direction.

  Further, the front side member 30 is disposed between the upper wall portion 30C and the lower wall portion 30D, and the first rib 30E extends substantially parallel (in the horizontal direction) to the upper wall portion 30C and the lower wall portion 30D. It has. The first rib 30E connects the vertical intermediate portion of the outer wall portion 30A and the vertical intermediate portion of the inner wall portion 30B in the vehicle width direction inside the front side member 30.

  As shown in FIG. 3, the dash cross member 20 is formed by subjecting an aluminum alloy material to extrusion or the like, like the front side member 30. The dash cross member 20 has a front wall portion 20A extending in the vehicle width direction with the front-rear direction as a thickness direction, and a rear wall disposed on the rear side with respect to the front wall portion 20A and extending substantially parallel to the front wall portion 20A. Part 20B. A dash panel 40 is joined to the upper end portion of the rear wall portion 20B to separate the vehicle interior from the power unit room (a space where a motor or the like is disposed). The dash cross member 20 includes an upper wall portion 20C that extends in the vehicle width direction with the vertical direction as the thickness direction and connects the upper end of the front wall portion 20A and the middle portion of the rear wall portion 20B in the front-rear direction. Yes.

  Further, the dash cross member 20 includes a second rib 20D that is disposed on the lower side of the upper wall portion 20C and extends substantially parallel (in the horizontal direction) to the upper wall portion 20C. The second rib 20D connects the vertical middle portion of the front wall portion 20A and the vertical middle portion of the rear wall portion 20B in the front-rear direction inside the dash cross member 20. Here, as shown in FIGS. 2, 3, and 4, the second rib 20 </ b> D is disposed on an extension in the direction in which the first rib 30 </ b> E (see FIG. 2) of the front side member 30 extends. In other words, the second rib 20D of the dash cross member 20 and the first rib 30E of the front side member 30 extend in the horizontal direction at the same vertical position (on the alternate long and short dash line L shown in FIGS. 2 and 3). Exist.

  Further, the dash cross member 20 is inclined to the rear side as it extends downward from the lower end of the front wall portion 20A, and is inclined to the rear side as it goes downward from the lower end of the rear wall portion 20B. And a rear inclined wall portion 20F extending substantially parallel to the front inclined wall portion 20E. Further, the dash cross member 20 connects the lower end of the front wall portion 20A and the lower end of the rear wall portion 20B in the front-rear direction, and the rear end portion protrudes rearward from the rear inclined wall portion 20F. It has. The front end portion of the floor panel 14 is joined to the rear end portion of the lower wall portion 20G.

  Further, the dash cross member 20 includes a third rib 20H that connects the lower end of the front wall portion 20A and the upper end side of the rear inclined wall portion 20F. The third rib 20H extends in the front-rear direction and the vehicle width direction (horizontal direction) with the vertical direction as the thickness direction. Furthermore, the dash cross member 20 includes a fourth rib 20I that connects a portion of the rear inclined wall portion 20F to which the third rib 20H is connected and an intermediate portion in the vertical direction of the front inclined wall portion 20E. The fourth rib 20I is gently inclined toward the front side as it goes downward. The dash cross member 20 includes a fifth rib 20J that connects a portion of the front inclined wall portion 20E to which the fourth rib 20I is connected and a middle portion in the vertical direction of the rear inclined wall portion 20F. The fifth rib 20J extends substantially parallel to the third rib 20H on the lower side of the third rib 20H. Further, the dash cross member 20 includes a sixth rib 20K that connects a portion of the rear inclined wall portion 20F to which the fifth rib 20J is connected and the lower end of the front inclined wall portion 20E. The sixth rib 20K extends substantially in parallel with the fourth rib 20I below and behind the fourth rib 20I.

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

  FIG. 5 schematically shows a front portion 10C of the vehicle body 10 to which the vehicle body front portion structure of the present embodiment is applied. When a collision load F1 in the vehicle front-rear direction due to a frontal collision or the like is input to the front portion 10C of the vehicle body 10, the collision load F1 is transmitted from the front side member 30 to the dash cross member 20. 5 shows a state in which a collision load F1 due to an offset collision is input from the right front side of the vehicle body 10 to the right front side member 30.

  Further, as shown in FIG. 6, a part F2 of the collision load F1 transmitted to the dash cross member 20 is transmitted to the right rocker 12 and another one of the collision loads F1 transmitted to the dash cross member 20. The part F3 is transmitted to the left rocker 12.

  Here, as shown in FIGS. 2, 3, and 4, in the present embodiment, a first rib 30 </ b> E is provided inside the front side member 30, and a first rib 30 </ b> E is provided inside the dash cross member 20. Two ribs 20D are provided. The second rib 20 </ b> D inside the dash cross member 20 is provided on the extension of the first rib 30 </ b> E inside the front side member 30. Thereby, the collision load from the part in which the first rib 30E is provided in the front side member 30 can be effectively supported in the part in which the second rib is provided in the dash cross member 20. As a result, the reaction force of the vehicle body 10 against the collision load F1 can be ensured without providing the reinforcing member such as the under member on the floor panel 14 side or reducing the reinforcing member such as the under member.

  In the present embodiment, an example in which the second rib 20D provided in the dash cross member 20 and the first rib 30E provided in the front side member 30 are arranged at the same position in the vertical direction has been described. The present invention is not limited to this. The vertical positions of the first rib 30E and the second rib 20D may be deviated within a range where the above-described effect can be obtained.

  A plurality of ribs corresponding to the first ribs 30E are provided in the front side member 30, and a plurality of ribs corresponding to the second ribs 20D are provided in the dash cross member 20, so that a plurality of ribs corresponding to the second ribs 20D are provided. The ribs may extend on the extension of the plurality of ribs corresponding to the first rib 30E.

  Although one embodiment of the present invention has been described above, the present invention is not limited to the above, and various modifications other than the above can be implemented without departing from the spirit of the present invention. Of course.

20 dash cross member 20D second rib 30 front side member 30E first rib

Claims (1)

A pair of left and right front side members having a first rib extending in the vehicle horizontal direction in the front portion of the vehicle body and extending in the vehicle longitudinal direction;
The second pair of left and right front side members extend in the vehicle width direction on the vehicle rear side and are connected to the pair of left and right front side members, and extend in the vehicle horizontal direction on the extension in the direction in which the first rib extends. A dash cross member having ribs;
Body front structure with