Front portion structure of vehicle body

Abstract

The present application provides a vehicle body front structure capable of properly withstanding a front collision load at the time of a bias collision. A vehicle body front structure (1) includes a front side frame (5) extending in a vehicle body front-rear direction, and a lower member (6) extending in the vehicle body front-rear direction on an outer side in a vehicle width direction than the front side frame (5), a front end portion of the front side frame (5) and a front end portion of the lower member (6) are connected to each other, an outer end portion in the vehicle width direction of the front side frame (5) is inclined to the outer side in the vehicle width direction as it goes toward the front of the vehicle body, and an inner end portion in the vehicle width direction of the lower member (6) extends in the vehicle body front-rear direction without being inclined to the inner side in the vehicle width direction as it goes toward the front of the vehicle body.

Description

TECHNICAL FIELD

[0001] The present application relates to a vehicle body front structure. BACKGROUND

[0002] In recent years, from the viewpoint of improving the global environment in order to suppress natural disasters, improvement in fuel consumption of automobiles is required. On the other hand, it is required to maintain or improve the collision safety of vehicles. In order to meet these requirements, development of a high-strength and lightweight vehicle body structure has progressed. For a vehicle structural member, that is, a frame that forms a vehicle body skeleton, in order to achieve lightweight of the vehicle body structure while maintaining the existing collision performance, high-strength and thin-walled development of a steel sheet that forms the frame has progressed. As a vehicle body front structure, Patent Literature 1 describes a structure in which a front end portion of a front side frame is widened toward the outside in the vehicle width direction to approach a lower member, and a front end portion of the lower member is inclined toward the inside in the vehicle width direction to approach the front side frame.

[0003] PRIOR ART DOCUMENTS

[0004] PATENT LITERATURE

[0005] Patent Literature 1: Japanese Patent Application Publication No. 2017-136947 SUMMARY

[0006] PROBLEMS TO BE SOLVED BY THE INVENTION

[0007] In this structure, at the time of offset collision of the vehicle, the front collision load is transmitted to the front side frame and the lower member, respectively. Here, the lower member is a structure in which the front end portion is curved toward the vehicle width direction, and thus there is a possibility that the load is not transmitted well.

[0008] The present application was made in view of the foregoing problems, and the problem is to provide a vehicle body front structure that can appropriately receive a front collision load at the time of offset collision.

[0009] MEANS FOR SOLVING THE PROBLEMS

[0010] In order to solve the foregoing problems, the vehicle body front structure of the present application includes: a front side frame that is provided so as to extend in the vehicle body front-rear direction; and a lower member that is provided so as to extend in the vehicle body front-rear direction on the outside in the vehicle width direction from the front side frame, a front end portion of the front side frame and a front end portion of the lower member are connected to each other, an outer end portion in the vehicle width direction of the front side frame is inclined toward the outside in the vehicle width direction as it approaches the front of the vehicle body, and an inner end portion in the vehicle width direction of the lower member extends in the vehicle body front-rear direction without being inclined toward the inside in the vehicle width direction as it approaches the front of the vehicle body.

[0011] EFFECTS OF THE INVENTION

[0012] According to the present application, it is possible to appropriately receive a front collision load at the time of offset collision by improving the load absorption efficiency of the lower member. BRIEF DESCRIPTION OF DRAWINGS

[0013] Figure 1 FIG. 1 is a side view schematically showing a front portion structure of a vehicle body according to an embodiment of the present application.

[0014] Figure 2 FIG. 2 is a plan view schematically showing the front portion structure of the vehicle body according to the embodiment of the present application.

[0015] Figure 3 FIG. 3 is a III-III line sectional view of FIG. 1. Figure 1

[0016] Figure 4 FIG. 4 is an enlarged view of a portion of FIG. 1. Figure 3

[0017] Figure 5 FIG. 5 is a perspective view schematically showing a vicinity of a bracket of the front portion structure of the vehicle body according to the embodiment of the present application.

[0018] BRIEF DESCRIPTION OF THE DRAWINGS

[0019] 1 front portion structure of vehicle body

[0020] 2 bumper beam

[0021] 3 extension portion

[0022] 4 bracket

[0023] 5 front side frame

[0024] 6 lower member

[0025] 6F front portion of lower member

[0026] 6R rear portion of lower member

[0027] 7 upper member

[0028] 8 shock absorber mount

[0029] 9 shock absorber housing

[0030] 10 inner member of front side frame

[0031] 20 outer member of front side frame

[0032] 30 extension portion lower member

[0033] 40 extension portion upper member

[0034] 50 front inner portion of lower member

[0035] 60 front outer portion of lower member DETAILED DESCRIPTION

[0036] ​​Next, an embodiment of the present application will be described in detail with reference to the drawings, taking the case where the vehicle body front structure of the present application is applied to the left side of a vehicle as an example. In the drawings, "front and rear" indicates the front and rear directions in the direction in which the vehicle travels, and "left and right" indicates the left and right directions (vehicle width direction) as viewed from the driver's seat.

[0037] As shown in Figs. 1 and 2, the vehicle body front structure 1 of the embodiment of the present application includes a bumper beam 2, an extension portion 3, a bracket 4, a front side frame 5, a lower member 6, an upper member 7, a shock absorber mount 8, and a shock absorber housing 9. Figure 1 Figure 2 As shown in Figs. 1 and 2, the vehicle body front structure 1 of the embodiment of the present application includes a bumper beam 2, an extension portion 3, a bracket 4, a front side frame 5, a lower member 6, an upper member 7, a shock absorber mount 8, and a shock absorber housing 9.

[0038] <bumper beam>

[0039] The bumper beam 2 is a metal skeletal member that extends in the vehicle width direction at the front end portion of the vehicle.

[0040] <extension portion>

[0041] The extension portion 3 is a metal skeletal member that extends rearward from the vehicle width direction end portion of the bumper beam 2. The extension portion 3 has a substantially rectangular closed cross-sectional shape in plan view, and transmits a front collision load applied to the bumper beam 2 to the front side frame 5 and the lower cross member 6 rearward via the bracket 4.

[0042] <bracket>

[0043] The bracket 4 is a metal plate-shaped member that connects the rear end portion of the extension portion 3, the front end portion of the front side frame 5, and the front end portion of the lower member 6.

[0044] <front side frame>

[0045] The front side frame 5 is a metal skeletal member that extends in the vehicle body front and rear direction at the front portion of the vehicle. The front side frame 5 has a substantially rectangular closed cross-sectional shape in plan view. The rear end portion of the front side frame 5 is joined to the instrument panel D that divides the power room and the passenger room. The vehicle width direction outer end portion of the front side frame 5 is inclined to the outside in the vehicle width direction as it tends toward the front of the vehicle body. The front side frame 5 includes a front side frame inner member 10, a front side frame outer member 20, an extension portion lower member 30 (see Fig. 3), and an extension portion upper member 40. Figure 3

[0046] <front side frame inner member>

[0047] The front side frame inner member 10 integrally includes an inner wall portion 11, a lower wall portion 12 that extends outward in the vehicle width direction from the lower end portion of the inner wall portion 11, and an upper wall portion 13 that extends outward in the vehicle width direction from the upper end portion of the inner wall portion 11. In addition, the front side frame inner member 10 integrally includes a lower flange portion that extends downward from the vehicle width direction outer end portion of the lower wall portion 12, and an upper flange portion that extends upward from the vehicle width direction outer end portion of the upper wall portion 13.​​

[0048] Front side frame outer member

[0049] The front side frame outer member 20 constitutes an outer wall portion of the front side frame 5. The lower end portion of the front side frame outer member 20 is joined to the lower flange portion of the front side frame inner member 10 by welding or the like. The upper end portion of the front side frame outer member 20 is joined to the upper flange portion of the front side frame inner member 10 by welding or the like.

[0050] Extension portion lower member

[0051] The extension portion lower member 30 constitutes a vehicle width direction outer portion of the front end portion of the vehicle width direction outer wall portion and the lower wall portion of the front side frame 5. The extension portion lower member 30 integrally includes a lower wall portion 31 and a rear wall portion 32 that is provided so as to extend upward from the rear end portion of the lower wall portion 31. The front end portion of the lower wall portion 31 is joined to the bracket 4 by welding or the like.

[0052] Extension portion upper member

[0053] The extension portion upper member 40 constitutes a vehicle width direction outer portion of the front end portion of the upper wall portion of the front side frame 5. The extension portion upper member 40 integrally includes an upper wall portion 41, an outer flange portion 42 that is provided so as to extend upward from the vehicle width direction outer end portion of the upper wall portion 41, a front flange portion 43 that is provided so as to extend upward from the front end portion of the upper wall portion 41, and a rear flange portion 44 that is provided so as to extend upward from the rear end portion of the upper wall portion 41. The vehicle width direction inner end portion of the upper wall portion 41 is joined to the vehicle width direction outer end portion of the upper wall portion 13 of the front side frame inner member 10 by welding or the like. The rear portion of the outer flange portion 42 is joined to the inner wall portion 51 of the lower member front portion 50 described later by welding or the like. The front portion of the outer flange portion 42 is joined to the outer wall portion 61 of the lower member front outer portion 60 described later by welding or the like. The front flange portion 43 is joined to the bracket 4 by welding or the like. The rear flange portion 44 is joined to the upper end portion of the rear wall portion 32 of the extension portion lower member 30 by welding or the like.

[0054] Lower member

[0055] The lower member 6 is a metal skeletal member that extends in the vehicle body front-rear direction at the front portion of the vehicle. The lower member 6 is provided on the vehicle width direction outer side of the front side frame 5 and is inclined upward as it tends toward the rear. The vehicle width direction inner end portion of the lower member 6 extends in the vehicle body front-rear direction and is not inclined toward the vehicle width direction inner side as it tends toward the front of the vehicle body.

[0056] The lower member 6 is constituted by combining a lower member front portion 6F and a lower member rear portion 6R.

[0057] Lower member front portion

[0058] The lower member front portion 6F is a portion that constitutes the front portion of the lower member 6. The lower member front portion 6F is inclined upward as it tends rearward. The lower member front portion 6F is constituted by combining a lower member front inner portion 50 and a lower member front outer portion 60.

[0059] Lower member front inner portion

[0060] The lower member front inner portion 50 integrally includes an inner wall portion 51 and a lower wall portion 52 that is provided extending outward in the vehicle width direction from a lower end portion of the inner wall portion 51. The lower wall portion 52 is shaped so as to narrow in width as it tends forward. The front end portion of the lower wall portion 52 is located rearward compared to the front end portion of the inner wall portion 51. The front end portion of the lower wall portion 52 is joined to the rear wall portion 32 of the extension lower member 30 by welding or the like.

[0061] Lower member front outer portion

[0062] The lower member front outer portion 60 integrally includes an outer wall portion 61 and an upper wall portion 62 that is provided extending inward in the vehicle width direction from an upper end portion of the outer wall portion 61. The upper wall portion 62 is shaped so as to narrow in width as it tends forward, and disappears rearward compared to the front end portion of the lower member front outer portion 60. The front end portion of the outer wall portion 61 is located forward compared to the front end portion of the inner wall portion 51, and is disposed in the same position as the outer wall portion of the extension portion 3 and the inner wall portion 51 of the lower member front inner portion 50 in the vehicle width direction. That is, the front end portion of the lower member 6 is continuous with the outer wall portion (vehicle width direction outer end portion) of the extension portion 3 in the vehicle body front-rear direction.

[0063] In addition, the lower member front outer portion 60 integrally includes an outer flange portion that is provided extending outward in the vehicle width direction from a lower end portion of the outer wall 61, and an upper flange portion that is provided extending upward from an upper end portion of the upper wall portion 62. The outer flange portion is joined to the vehicle width direction outer end portion of the lower wall portion 52 by welding or the like. The upper flange portion is joined to the upper end portion of the inner wall portion 51 by welding or the like.

[0064] As shown in Figures 3 to 5 the lower member front outer portion 60 includes a first flange portion 66, a second flange portion 67, and a third flange portion 68. The first flange portion 66 is provided extending upward from an upper end portion of the front end portion of the outer wall portion 61, overlaps the vehicle width direction outer side of the extension upper member 40 in the front side frame 5, and is joined to the extension upper member 40 by welding or the like. The second flange portion 67 is provided extending outward in the vehicle width direction from a height direction intermediate portion of the front end portion of the outer wall portion 61, overlaps the rear side of the bracket 4, and is joined to the bracket 4 by welding or the like. The third flange portion 68 is provided extending outward in the vehicle width direction from a lower end portion of the front end portion of the outer wall portion 61, overlaps the upper side of the lower wall portion 31 of the extension lower member 30 in the front side frame 5, and is joined to the lower wall portion 31 by welding or the like.

[0065] Lower member rear portion

[0066] AsFigure 1 and Figure 2 The lower member rear portion 6R is a member that constitutes the rear portion of the lower member 6. The lower member rear portion 6R extends in the vehicle body front-rear direction, and the rear end portion of the lower member front portion 50 is joined to the lower end portion of the front portion of the lower member rear portion 6R by welding or the like. The front end portion of the lower member rear portion 6R is joined to a front pillar (not shown) by welding or the like.

[0067] <Upper member>

[0068] The upper member 7 is a metal skeletal member that extends in the vehicle body front-rear direction in the front portion of the vehicle. The rear end portion of the lower member rear portion 6R is joined to the front end portion of the upper member 7 by welding or the like. The rear end portion of the upper member 7 is joined to a front pillar (not shown) by welding or the like.

[0069] <Shock absorber mount>

[0070] The shock absorber mount 8 is a member that supports a shock absorber that suspends a front wheel of the vehicle. The shock absorber mount 8 is joined to the rear end portion of the lower member 6F and the vehicle width direction inner side of the front end portion of the upper member 7 by welding or the like.

[0071] <Shock absorber housing>

[0072] The shock absorber housing 9 is a member that covers a shock absorber that suspends a front wheel of the vehicle from the vehicle width direction inner side. The upper end portion of the shock absorber housing 9 is joined to the lower end portion of the shock absorber mount 8 by welding or the like, and the lower end portion of the shock absorber housing 9 is joined to the front side frame 5 by welding or the like.

[0073] In the case where the vehicle body front portion structure 1 is subjected to a front collision load, more specifically, a shift load, a large portion of the load is transmitted to the front side frame 5 rather than the lower member 6. In addition, a portion of the load is transmitted linearly in the front-rear direction from the vehicle width direction outer end portion of the extension portion 3 to the lower member 6.

[0074] The vehicle body front portion structure 1 of the embodiment of the present application includes a front side frame 5 that extends in the vehicle body front-rear direction and a lower member 6 that extends in the vehicle body front-rear direction on the vehicle width direction outer side compared to the front side frame 5, a front end portion of the front side frame 5 and a front end portion of the lower member 6 are joined to each other, a vehicle width direction outer end portion of the front side frame 5 is inclined to the vehicle width direction outer side as it tends toward the front of the vehicle body, and a vehicle width direction inner end portion of the lower member 6 extends in the vehicle body front-rear direction and is not inclined to the vehicle width direction inner side as it tends toward the front of the vehicle body.

[0075] Therefore, the vehicle body front structure 1 can improve the load absorption efficiency of the lower member 6 with respect to the front collision load at the time of the offset collision.

[0076] In the vehicle body front structure 1, the lower member 6 narrows in width in the vehicle width direction as it approaches the front of the vehicle body.

[0077] Therefore, the vehicle body front structure 1 can achieve a reduction in the size of the protruding portion 3 in the vehicle width direction.

[0078] In the vehicle body front structure 1, the lower member 6 narrows in width in the vehicle width direction as it approaches the front of the vehicle body.

[0079] Therefore, the vehicle body front structure 1 can improve the load transfer efficiency from the protruding portion 3 to the lower member 6.

[0080] In the vehicle body front structure 1, the lower member 6 is connected to both the front side frame 5 and the bracket 4.

[0081] Therefore, the vehicle body front structure 1 can improve the fixing strength of the front end portion of the lower member 6.

[0082] In the vehicle body front structure 1, the lower member 6 includes a first flange portion 66 that extends upward from an upper end portion of the front end portion of the lower member 6, a second flange portion 67 that extends outward in the vehicle width direction from the front end portion of the lower member 6, and a third flange portion 68 that extends downward from a lower end portion of the front end portion of the lower member 6, the first flange portion 66 and the third flange portion 68 being connected to the front side frame 5, and the second flange portion 67 being connected to the bracket 4.

[0083] Therefore, the vehicle body front structure 1 can further improve the fixing strength of the front end portion of the lower member 6.

[0084] Further, in the vehicle body front portion structure 1, the first flange portion 66 overlaps and is joined to the front side frame 5 in the vehicle width direction, the second flange portion 67 overlaps and is joined to the bracket 4 in the vehicle body front-rear direction, and the third flange portion 68 overlaps and is joined to the front side frame 5 in the up-down direction.

[0085] Therefore, the vehicle body front portion structure 1 can further improve the fixing strength of the front end portion of the lower member 6 by fixing the front end portion of the lower member 6 in three different directions.

[0086] The above describes the embodiments of the present application, but the present application is not limited to the foregoing embodiments and can be appropriately changed within the scope that does not depart from the gist of the present application.

Claims

1. A vehicle body front structure characterized by comprising: Comprising: a front side frame provided extending in a vehicle body front-rear direction; and a lower member provided extending in the vehicle body front-rear direction outward in a vehicle width direction from the front side frame, a front end portion of the front side frame and a front end portion of the lower member are connected to each other, a vehicle width direction outer end portion of the front side frame is inclined outward in the vehicle width direction as it approaches the vehicle body front side, a vehicle width direction inner end portion of the lower member extends in the vehicle body front-rear direction without being inclined inward in the vehicle width direction as it approaches the vehicle body front side, the lower member narrows in width in the vehicle width direction as it approaches the vehicle body front side, the vehicle body front portion structure is provided with a bracket connected to the front end portion of the front side frame and the front end portion of the lower member, the lower member is connected to both the front side frame and the bracket, the lower member includes a first flange portion provided extending upward from an upper end portion of the front end portion of the lower member, a second flange portion provided extending outward in the vehicle width direction from the front end portion of the lower member, and a third flange portion provided extending outward in the vehicle width direction from a lower end portion of the front end portion of the lower member, the first flange portion and the third flange portion are connected to the front side frame, the second flange portion is connected to the bracket.

2. The vehicle body front structure according to claim 1, characterized by Comprising: a bumper beam provided extending in the vehicle width direction at the vehicle body front portion; and a protruding portion connecting a rear end portion of the bumper beam and a front end portion of the lower member, the front end portion of the lower member and a vehicle width direction outer end portion of the protruding portion are continuous in the vehicle body front-rear direction.

3. The vehicle body front portion structure according to claim 1 or 2, characterized in that the first flange portion overlaps and is connected to the front side frame in the vehicle width direction, the second flange portion overlaps and is connected to the bracket in the vehicle body front-rear direction, the third flange portion overlaps and is connected to the front side frame in the up-down direction.

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