JP2005206107A - Body front structure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce a load component in a vehicle width direction acting on a connecting portion between a cross member and a front pillar and a connecting portion between a cross member and a floor tunnel portion with respect to an input load from a front side member to the cross member.
A curved shape portion in which a portion between a connecting portion 16A of a dash cross member 16 and a front pillar 18 and a connecting portion 16B of a front end portion 20A of a floor tunnel portion 20 is convex forward in a plan view. 16D, and the top portion (front end portion) of the curved shape portion 16D is a connecting portion 16C with the front side member 12.
[Selection] Figure 1

Description

  The present invention relates to a vehicle body front structure, and more particularly, to a vehicle body front structure of an automobile or the like provided with a front side member at the vehicle body front.

2. Description of the Related Art Conventionally, in a front body structure of an automobile or the like that includes a front side member at the front part of the vehicle body, a dash cross member that connects the front pillar and the floor tunnel portion is disposed on the rear side of the front side member. There is known a configuration in which a connecting portion with the front side member is projected forward of the vehicle body from the front pillar and the floor tunnel portion (see, for example, Patent Document 1).
JP 2003-212157 A

  However, in Patent Document 1, in the plan view of the vehicle body, the connecting portion of the cross member with the front side member has a rectangular shape that protrudes forward of the vehicle body, and the connecting portion of the cross member with the front side member and the front The connecting portion with the pillar and the connecting portion with the front side member and the connecting portion between the floor tunnel portion are linear. As a result, the load input to the front side member from the front side of the vehicle body is transmitted to the front pillar and the floor tunnel portion along these linear portions. For this reason, the load component of the vehicle width direction which acts on the connection part of a cross member and a front pillar and the connection part of a cross member and a floor tunnel part becomes large, and the support rigidity of a front side member falls.

  In view of the above facts, the present invention has an object to obtain a vehicle body front structure that can reduce the load component in the vehicle width direction that acts on the connecting portion between the cross member and the front pillar and the connecting portion between the cross member and the floor tunnel portion. It is.

  In the vehicle body front structure according to the first aspect of the present invention, the portion between the connection portion with the front pillar and the connection portion between the floor tunnel portion is a curved shape portion that protrudes forward in the vehicle body in plan view, and The top part of the shape part has a cross member connected to the front side member.

  Therefore, when a load acts on the front side member from the front of the vehicle body at the time of the frontal collision of the vehicle, this load is input from the top of the curved shape portion that protrudes forward of the vehicle body in plan view on the cross member, and passes through the curved shape portion. And transmitted to the front pillar and the floor tunnel. As a result, a load is applied to the connecting portion between the cross member and the front pillar and the connecting portion between the cross member and the floor tunnel portion substantially from the front side of the vehicle body along the curved shape portion of the cross member. For this reason, compared with the case where a load acts on the connection part of the cross member and the front pillar and the connection part of the cross member and the floor tunnel part linearly from the connection part of the cross member with the front side member, the cross member. The load component in the vehicle width direction acting on the connecting portion between the front pillar and the connecting portion between the cross member and the floor tunnel portion can be reduced.

  According to a second aspect of the present invention, in the vehicle body front portion structure according to the first aspect, the protrusion amount of the top portion of the curved shape portion is about ３ of the distance between the front pillar and the floor tunnel portion. It is characterized by.

  Therefore, in addition to the content of the first aspect, by setting the protrusion amount of the top of the curved portion of the cross member to about ３ of the distance between the front pillar and the floor tunnel portion, the strength of the cross member and Stiffness can be effectively improved.

  In the vehicle body front structure according to the first aspect of the present invention, a portion between the connecting portion with the front pillar and the connecting portion between the floor tunnel portion is a curved shape portion that protrudes forward in the vehicle body in plan view, and has a curved shape. Since the top of the portion has a cross member connected to the front side member, it is possible to reduce the load component in the vehicle width direction acting on the connecting portion between the cross member and the front pillar and the connecting portion between the cross member and the floor tunnel portion. Has an excellent effect.

  The invention according to claim 2 is the vehicle body front part structure according to claim 1, wherein the amount of protrusion of the top of the curved portion is about 1/3 of the distance between the front pillar and the floor tunnel portion. In addition to the effect described in 1, it has an excellent effect that the strength and rigidity of the cross member can be effectively improved.

  1st Embodiment of the vehicle body front part structure of this invention is described according to FIGS.

  In the figure, the arrow FR indicates the vehicle body front direction, the arrow UP indicates the vehicle body upward direction, and the arrow IN indicates the vehicle width inside direction.

  As shown in FIG. 2, a pair of left and right front side members 12 are disposed in the vehicle body front portion 10 of the present embodiment in the vicinity of the lower portions at both ends in the vehicle width direction along the vehicle body longitudinal direction. The front portion 12A of the front side member 12 has a closed cross-sectional structure extending in the longitudinal direction of the vehicle body, and an inclined portion 12D formed at the rear end of the front portion 12A of the front side member 12, and a rear end of the inclined portion 12D, The rear portion 12B of the front side member 12 extending substantially horizontally toward the rear of the vehicle body has a hat-shaped cross section with the opening portion facing upward, and the inclined portion 12D and the rear portion 12B are formed on the lower surface of the dash panel 14. 14A.

  A rear end portion 12C of the front portion 12A of the front side member 12 is joined to a dash cross member 16 as a pair of left and right cross members extending in the vehicle width direction. The dash cross member 16 is connected to the dash panel 14, and the dash cross member 16 forms a closed cross section extending in the vehicle width direction with the dash panel 14.

  As shown in FIG. 1, the dash cross member 16 connects one of the left and right front pillars 18 to the front end 20 </ b> A of the floor tunnel portion 20, and the connecting portion 16 </ b> C of the dash cross member 16 to the front side member 12. However, the front pillar 18 and the floor tunnel portion 20 protrude forward of the vehicle body.

  Further, a curved portion 16D having a portion between the connecting portion 16A of the dash cross member 16 connected to the front pillar 18 and the connecting portion 16B of the front end portion 20A of the floor tunnel portion 20 protruding forward in the vehicle body in a plan view. The top portion (front end portion) of the curved shape portion 16 </ b> D serves as a connection portion 16 </ b> C with the front side member 12.

  The connecting portions 16B of the left and right dash cross members 16 connected to the front end portion 20A of the floor tunnel portion 20 are connected to each other by a connecting member 17.

  As shown in FIG. 3, the side cross-sectional shape of the curved shape portion 16D between the front pillar 18 of the dash cross member 16 and the floor tunnel portion 20 is a hat shape with the opening facing the rear of the vehicle body. A flange 16E formed at the open end is joined to the vertical wall portion 14B of the dash panel 14. Further, a rear end portion 12F of the upper wall portion 12E of the rear end portion 12C of the front portion 12A of the front side member 12 is joined to the upper wall portion 16F of the connecting portion 16C of the dash cross member 16.

  As shown in FIG. 1, a flange 12H is formed at the rear end portion of the rear end portion 12C of the front portion 12A of the front side member 12 in the vehicle width direction toward the outer side in the vehicle width direction. The flange 12H is joined to the front wall portion 16G of the connecting portion 16C of the dash cross member 16. Further, a flange 12K is formed at the rear end of the front end 12A of the front side member 12 at the rear end 12C in the vehicle width direction inner side wall portion 12J toward the inner side in the vehicle width direction. The cross member 16 is joined to the front wall portion 16G of the connecting portion 16C.

  As shown in FIG. 2, the sectional shape of the inclined portion 12 </ b> D of the front side member 12 viewed from the front-rear direction of the vehicle body is a hat shape with the opening portion directed upward of the vehicle body, and left and right flanges formed at the opening end portions. 12L is joined to the lower wall portion 16H of the dash cross member 16 and the lower surface 14A of the dash panel 14. The cross-sectional shape of the rear portion 12B of the front side member 12 as viewed from the front-rear direction of the vehicle body is also a hat shape with the opening portion directed upward of the vehicle body, and the left and right flanges 12L formed at the opening end portions of the dash panel 14 It is joined to the lower surface 14A.

  An extending portion 16J extending toward the rear of the vehicle body along the floor tunnel portion 20 is formed from the connecting portion 16B of the dash cross member 16 with the front end portion 20A of the floor tunnel portion 20.

  As shown in FIG. 4, the extending portion 16 </ b> J of the dash cross member 16 has a square shape with the opening facing the ridge line 20 </ b> B of the floor tunnel portion 20, and flanges 16 </ b> K and 16 </ b> L formed at the opening end portions. The bottom surface of the upper wall portion 20C of the floor tunnel portion 20 is joined to the inner surface of the side wall portion 20D in the vehicle width direction.

  Note that the flanges 14 </ b> C formed at both ends of the dash panel 14 in the vehicle width direction are joined to the left and right rockers 22.

  As shown in FIG. 5, in the connecting portion 16 </ b> A of the dash cross member 16 with the front pillar 18, the rear end portion 16 </ b> N of the front wall portion 16 </ b> M of the dash cross member 16 is joined to the vehicle width direction outer side surface 18 </ b> A of the front pillar 18. Has been. Further, in the connecting portion 16A of the dash cross member 16 with the front pillar 18, the upper flange 16P and the lower flange 16Q of the dash cross member 16 are joined to the front side face 18B and the front side joining flange 18C of the front pillar 18. .

  Further, in the present embodiment, as shown in FIG. 1, the protrusion amount X of the top portion (front end portion) of the curved portion 16D of the dash cross member 16 in plan view is the distance Y between the front pillar 18 and the floor tunnel portion 20. It is about 1/3 of.

  Next, the operation of this embodiment will be described.

  In the present embodiment, when a load acts on the front side member 12 from the front of the vehicle body at the time of a frontal collision of the vehicle, this load (arrow F in FIG. 1) is fronted by the dash cross member 16 connected to the front side member 12. It is distributed and transmitted to the pillar 18 and the floor tunnel portion 20.

  At this time, in this embodiment, a portion between the connecting portion 16A of the dash cross member 16 with the front pillar 18 and the connecting portion 16B with the front end portion 20A of the floor tunnel portion 20 protrudes forward in the vehicle body in plan view. The curved shape portion 16 </ b> D is formed, and the top portion of the curved shape portion 16 </ b> D serves as a connection portion 16 </ b> C with the front side member 12.

  As a result, in the present embodiment, as shown in FIG. 6, from the connecting portion P1 of the dash cross member 16 to the front side member 12, the connecting portion P2 of the dash cross member 16 to the front pillar 18 and the dash cross member 16 The load F transmitted to the connecting portion P3 with the front end portion 20A of the floor tunnel portion 20 is an axial force along the axis L of the curved shape portion 16D of the dash cross member 16. Therefore, a load acts on the connecting portion P2 of the dash cross member 16 with the front pillar 18 and the connecting portion P3 of the dash cross member 16 with the front end portion 20A of the floor tunnel portion 20 from substantially the front side of the vehicle body.

  Therefore, as compared with the configuration in which the load is linearly transmitted from the connecting portion P1 of the dash cross member to the connecting portion P2 and the connecting portion P3 as in the comparative example shown by the two-dot chain line in FIG. The load component F1 in the vehicle width direction acting on the connecting portion P2 of the dash cross member 16 with the front pillar 18 and the connecting portion P3 of the dash cross member 16 with the floor tunnel portion 20 can be reduced.

  As a result, in the present embodiment, the load component F2 to the rear of the vehicle body acts more on the connecting portion P2 and the connecting portion P3 that have higher support rigidity on the rear side of the vehicle than on the outside of the vehicle width. The support rigidity can be improved.

  Further, in the present embodiment, as shown in FIG. 1, the protrusion amount X of the top portion (front end portion) of the curved portion 16D of the dash cross member 16 in plan view is the distance Y between the front pillar 18 and the floor tunnel portion 20. Therefore, the strength and rigidity of the dash cross member 16 can be effectively improved.

  As shown in FIG. 7, a configuration in which a flange 16T having a U-shape in front view is formed at a connecting portion 16A of the dash cross member 16 with the front pillar 18 and this flange 16T is joined to the front side surface 18B of the front pillar 18 is provided. It is also good.

  Further, as shown in FIG. 8A, in consideration of the productivity of parts, a bracket 30 is provided at a connecting portion 16A of the dash cross member 16 with the front pillar 18, and the front pillar 18 extends forward of the vehicle body. A configuration in which the vehicle width direction end portion 16R of the dash cross member 16 and the bracket 30 are connected to each other with the front joint flange 18C interposed therebetween.

  Further, as shown in FIG. 8B, another plate member 32 is added to the joint flange 18C of the front pillar 18 and the vehicle width direction end portion 16R of the dash cross member 16 is sandwiched between the plate member 32 and the plate member 32. It is good also as a structure which connected the bracket 30. FIG.

  Further, as shown in FIG. 9, the extending portion 16J of the dash cross member 16 has a hat shape with the opening directed upward of the vehicle body, and the flange 16S formed at the opening end is the upper wall portion of the floor tunnel portion 20. It is good also as a structure joined to the lower surface of 20C.

  10, the rear end 12F of the upper wall 12E of the rear end 12C of the front portion 12A of the front side member 12 is bent upward toward the vehicle body, and the rear end 12F is bent to the dash cross member 16 as shown in FIG. It is good also as a structure joined to the front wall part 16G of the connection part 16C.

  Next, a second embodiment of the vehicle body front structure of the present invention will be described with reference to FIGS.

  In addition, about the same member as 1st Embodiment, the same code | symbol is attached | subjected and the description is abbreviate | omitted.

  As shown in FIG. 11, in this embodiment, the dash cross member 40 is disposed on the vehicle interior side of the dash panel 14, and the dash cross member 40 is joined to the dash panel 14 and closed with the dash panel 14. A cross section is formed.

  The dash cross member 40 connects the left and right front pillars 18 and the front end 20A of the floor tunnel portion 20, and the connecting portion 40C of the dash cross member 40 with the front side member 12 is connected to the front pillar 18 and the floor. Projecting forward from the tunnel portion 20 to the vehicle body.

  Further, a curved portion 40D having a portion between the connecting portion 40A of the dash cross member 40 connected to the front pillar 18 and the connecting portion 40B of the front end portion 20A of the floor tunnel portion 20 protruding forward in the vehicle body in a plan view. The top of the curved portion 40D is a connecting portion 40C with the front side member 12.

  As shown in FIG. 12, the side cross-sectional shape of the curved shape portion 40D between the front pillar 18 of the dash cross member 40 and the front end portion 20A of the floor tunnel portion 20 is a hat shape with the opening facing the front of the vehicle body. The flange 40E formed at the open end is joined to the vertical wall portion 14B of the dash panel 14. Further, a rear end portion 12F that is bent toward the upper side of the vehicle body of the upper wall portion 12E of the rear end portion 12C in the front portion 12A of the front side member 12 is joined to the vertical wall portion 14B of the dash panel 14.

  From the connecting portion 40B of the dash cross member 40 to the front end portion 20A of the floor tunnel portion 20, an extending portion 40J is formed along the floor tunnel portion 20 toward the rear of the vehicle body.

  The connecting portions 40B of the left and right dash cross members 40 and the front end portion 20A of the floor tunnel portion 20 are connected to each other by the connecting member 17.

  As shown in FIG. 13, the extending portion 40J of the dash cross member 40 has a U shape with the opening facing the lower side of the vehicle body, and the flanges 40K and 40L formed at the opening end portions are the floor tunnel portion 20. It is joined to the upper surface of the upper wall portion 20C and the outer surface in the vehicle width direction of the side wall portion 20D.

  Next, the operation of this embodiment will be described.

  In the present embodiment, when a load is applied to the front side member 12 from the front of the vehicle body at the time of a vehicle frontal collision, the load is applied to the front pillar 18 and the floor tunnel portion 20 by the dash cross member 40 connected to the front side member 12. Are distributed and transmitted.

  In this case, in the present embodiment, a portion between the connecting portion 40A of the dash cross member 40 with the front pillar 18 and the connecting portion 40B with the front end portion 20A of the floor tunnel portion 20 is projected forward in the vehicle body. The curved portion 40D is a curved portion 40D, and the top portion of the curved portion 40D is a connecting portion 40C with the front side member 12.

  As a result, in this embodiment, as shown in FIG. 6 of the first embodiment, the connecting portion P1 of the dash cross member 40 with the front side member 12 to the connecting portion P2 of the dash cross member 40 with the front pillar 18 The load F transmitted to the connecting portion P3 of the dash cross member 40 with the front end portion 20A of the floor tunnel portion 20 becomes an axial force along the axis L of the curved shape portion 40D of the dash cross member 40. Therefore, a load acts on the connecting portion P2 of the dash cross member 40 with the front pillar 18 and the connecting portion P3 of the dash cross member 40 with the front end portion 20A of the floor tunnel portion 20 from substantially the front side of the vehicle body.

  Therefore, as compared with the configuration in which the load is linearly transmitted from the connecting portion P1 of the dash cross member to the connecting portion P2 and the connecting portion P3 as in the comparative example shown by the two-dot chain line in FIG. The load component F1 in the vehicle width direction acting on the connecting portion P2 of the dash cross member 40 with the front pillar 18 and the connecting portion P3 of the dash cross member 40 with the floor tunnel portion 20 can be reduced.

  As a result, in the present embodiment, the load component F2 to the rear of the vehicle body acts more on the connecting portion P2 and the connecting portion P3 that have higher support rigidity on the rear side of the vehicle than on the outside of the vehicle width. The support rigidity can be improved.

  As shown in FIG. 14, both the flanges 40 </ b> K and 40 </ b> L formed at the opening end of the extended portion 40 </ b> J of the dash cross member 40 may be joined to the upper surface of the upper wall portion 20 </ b> C of the floor tunnel portion 20. good.

  Although the present invention has been described in detail with respect to specific embodiments, the present invention is not limited to the above-described embodiments, and various other embodiments are possible within the scope of the present invention. It will be apparent to those skilled in the art. For example, the protrusion amount X of the top portion (front end portion) of the curved shape portion 16 </ b> D in the dash cross member 16 is not limited to about ３ of the distance Y between the front pillar 18 and the floor tunnel portion 20.

  The cross-sectional shapes of the front side member 12, the dash cross members 16, 40, the front pillar 18, and the left and right rockers 22 are not limited to the cross-sectional shapes of the above-described embodiments.

It is a plane sectional view showing the body front part structure concerning a 1st embodiment of the present invention. It is the perspective view seen from the vehicle body slanting back upper side which shows the vehicle body front part structure which concerns on 1st Embodiment of this invention. FIG. 3 is a cross-sectional view taken along line 3-3 in FIG. 1. FIG. 4 is a cross-sectional view taken along line 4-4 of FIG. It is the perspective view seen from the body slanting front outside which shows a part of vehicle body front part structure concerning a 1st embodiment of the present invention. It is operation | movement explanatory drawing of the vehicle body front part structure which concerns on 1st Embodiment of this invention. It is the perspective view seen from the vehicle body diagonally forward outer side which shows a part of vehicle body front part structure concerning the modification of 1st Embodiment of this invention. (A) is the perspective view seen from the vehicle body diagonally forward outer side which shows a part of vehicle body front part structure which concerns on the other modification of 1st Embodiment of this invention, (B) is 1st Embodiment of this invention. FIG. 10 is a perspective view showing a part of a vehicle body front part structure according to another modification as seen from the obliquely forward outer side of the vehicle body. It is sectional drawing corresponding to FIG. 4 which shows the vehicle body front part structure which concerns on the modification of 1st Embodiment of this invention. It is sectional drawing corresponding to FIG. 3 which shows the vehicle body front part structure which concerns on the modification of 1st Embodiment of this invention. It is the perspective view seen from the vehicle body slanting back upper side which shows the vehicle body front part structure which concerns on 2nd Embodiment of this invention. It is sectional drawing corresponding to FIG. 3 which shows the vehicle body front part structure which concerns on 2nd Embodiment of this invention. It is sectional drawing corresponding to FIG. 4 which shows the vehicle body front part structure which concerns on 2nd Embodiment of this invention. It is sectional drawing corresponding to FIG. 4 which shows the vehicle body front part structure which concerns on the modification of 2nd Embodiment of this invention.

Explanation of symbols

10 Car body front part 12 Front side member 14 Dash panel 16 Dash cross member (cross member)
16A Connection part of dash cross member with front pillar 16B Connection part of dash cross member with front end of floor tunnel part 16C Connection part of dash cross member with front side member 18 Front pillar 20 Floor tunnel part 40 Dash cross member ( Cross member)
40A Connection part of dash cross member with front pillar 40B Connection part of dash cross member with front end of floor tunnel part 40C Connection part of dash cross member with front side member

Claims (2)

  A cross member in which a portion between the connecting portion with the front pillar and the connecting portion with the floor tunnel portion is a curved shape portion convex forward of the vehicle body in plan view, and the top of the curved shape portion is connected to the front side member The vehicle body front part structure characterized by having.   The vehicle body front part structure according to claim 1, wherein a protruding amount of a top portion of the curved shape portion is about ３ of a distance between the front pillar and the floor tunnel portion.

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