JP2010228610A - Front body structure of automobile - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a front body structure of an automobile preventing local deformation due to change in a sectional height without increasing the number of parts and body weight. <P>SOLUTION: A recessed part 2f is formed in an upper face part 2e of a kick part 2b, at least at a boundary part 2g of a rear member part 2c, along the upper face part 2e. A reinforcing member 10 is connected with a kick part 2b to cover the recessed part 2f and is formed so that the section area height h from the kick part 2b to the rear member part 2c becomes substantially constant. <P>COPYRIGHT: (C)2011,JPO&amp;INPIT

Description

  The present invention relates to a front body structure of an automobile including left and right side members extending in the vehicle front-rear direction and a reinforcing member disposed in a kick portion of the side member.

  2. Description of the Related Art In a front body structure of an automobile, a structure including a front member portion, a kick portion that extends rearward and obliquely downward following the front member portion, and a rear member portion that extends rearward of the vehicle following the kick portion is common. . As a structure for preventing the kick portions of the left and right side members from being bent and deformed at the time of a vehicle collision, for example, Patent Documents 1 and 2 include a reinforcing member having a cross-sectional hat shape along the upper surface portion of the kick portion. A structure in which the kick portion is reinforced by coupling is proposed.

Japanese Patent No. 3357201 Japanese Patent Laid-Open No. 9-175437

  By the way, in each of the above-mentioned patent documents, since the hat-shaped reinforcing member is arranged in the kick part, the sectional height of the entire kick part including the reinforcing member is the sectional height of the front part and the rear part of the reinforcing member. It will be significantly higher than that. For this reason, at the time of a vehicle collision, there is a possibility that a portion having a small cross-sectional height, particularly a boundary portion with the rear member portion of the kick portion, is locally deformed.

  In order to prevent such deformation, it is necessary to provide a new reinforcing member in the side member, which causes a problem that the number of parts and the weight of the vehicle body increase.

The present invention has been made in view of the above-described conventional situation, and can increase the rigidity of the kick portion without increasing the number of parts and the weight of the vehicle body. An object is to provide a front body structure.

  The invention according to claim 1 includes a left member having a front member portion extending in the longitudinal direction of the vehicle, a kick portion extending obliquely downward rearward after the front member portion, and a rear member portion extending rearward of the vehicle following the kick portion. A vehicle front body structure including a right side member and a reinforcing member disposed on an upper surface of the kick portion of the left and right side members, wherein at least the rear member portion of the kick portion A recess is formed in the upper surface portion of the boundary portion with the upper surface portion, and the reinforcing member is coupled to the kick portion so as to cover the recess, and a cross section from the kick portion to the rear member portion It is characterized by being formed so that the height is substantially constant.

  According to a second aspect of the present invention, in the front body structure of the automobile according to the first aspect, cross members extending in the vehicle width direction are disposed on the upper surfaces of the left and right rear member portions, and the reinforcing member The rear end portion is located near the cross member or extends so as to overlap the front portion of the cross member.

  According to the front vehicle body structure according to the invention of claim 1, since the recess is formed on the upper surface portion of the boundary portion with at least the rear member portion of the kick portion, and the reinforcing member is coupled to the kick portion so as to cover the recess portion, While maintaining the same cross-sectional height, it is possible to increase the rigidity of the kick portion with respect to the load at the time of the vehicle collision, and to prevent the kick portion from being bent and deformed at the time of the vehicle collision.

  In the present invention, the reinforcing member is formed so that the cross-sectional height from the kick portion to the rear member portion is substantially constant, so that the cross-sectional height is not changed by arranging the reinforcing member. Local deformation due to the height difference can be prevented. Thereby, a collision load can be absorbed efficiently, without increasing the number of parts and vehicle body weight by addition of a new reinforcement member.

  In the invention of claim 2, since the rear end portion of the reinforcing member is located in the vicinity of the cross member or is arranged so as to overlap the front portion of the cross member, the collision load is efficiently transmitted from the reinforcing member to the cross member. Can be made.

  In addition, since the rear end position of the reinforcing member is up to the cross member, the floor shape of the rear side portion of the cross member can be made flat, and the raising member can be made unnecessary. For example, when the reinforcing member is extended from the cross member to the rear of the vehicle, an upper protrusion is formed on the floor by the extended portion of the reinforcing member, and the floor surface needs to be raised to the extended portion by the raising member. .

1 is a perspective view of a front body of an automobile according to Embodiment 1 of the present invention. It is a disassembled perspective view of the said front vehicle body. It is a side view of the front vehicle body. It is sectional drawing (IV-IV sectional view taken on the line of FIG. 1) of the said front vehicle body. It is a characteristic view which shows the relationship between a collision load and the height of a reinforcement member.

  FIGS. 1 to 5 are views for explaining a front body structure of an automobile according to a first embodiment of the present invention. In the present embodiment, front and rear and left and right mean front and rear and left and right when viewed in the forward direction of the vehicle.

  In the figure, reference numeral 1 denotes a front body of an automobile, which includes left and right side members 2 and 2 extending in the vehicle front-rear direction, and a floor panel 3 disposed on the upper surface of the left and right side members 2. And rocker panels 4 and 4 extending in the vehicle front-rear direction coupled to flange portions 3a and 3a formed to bend at the left and right edge portions of the floor panel 3.

  A tunnel portion 3b is formed to bulge upward at the center of the floor panel 3 in the vehicle width direction, and a shift lever mounting hole 3c is formed at the front portion of the tunnel portion 3b.

  A dash panel 5 that defines an engine compartment A and a vehicle compartment B is coupled to the front edge 3d of the floor panel 3 so as to extend upward from the front edge 3d.

  The left and right side members 2 include a front member portion 2a extending in the longitudinal direction of the vehicle, a kick portion 2b extending obliquely rearward and downward following the front member portion 2a, and extending rearward of the vehicle following the kick portion 2b. And a rear member portion 2c.

  The front member portion 2a has a cross-sectional hat shape that opens outward in the vehicle width direction, and suspends and supports an engine unit (not shown).

  The kick part 2b and the rear member part 2c have a cross-sectional hat shape opening upward, and the floor panel 3 and the dash panel 5 are formed on the upper surfaces of the left and right flange parts 2d and 2d of the kick part 2b and the rear member part 2b. Are connected by welding. The dash panel 5 extends upward along the upper surface portion 2e of the kick portion 2b.

  On the upper surface of the floor panel 3, left and right cross members 8, 8 extending in the vehicle width direction are disposed. The left and right cross members 8 are arranged in the middle in the front-rear direction of the rear member 2c of the left and right side members 2, and a front seat (not shown) is attached thereto.

  The left and right cross members 8 have a cross-sectional hat shape that opens downward, the front and rear flange portions 8a and 8a are joined to the floor panel 3 by welding, and the inner and outer flange portions 8b and 8c are respectively It is connected to the tunnel portion 3b and the rocker panel 4 by welding.

  A reinforcing member 10 is disposed on the upper surface portion 2e of the left and right kick portions 2b, and has the following structure in detail.

  The reinforcing member 10 is made of a material having a strength higher than that of the side member 2 or a material having a plate thickness larger than that of the side member 2.

  A concave portion 2f is formed from the upper surface portion 2e of the left and right kick portions 2b to the upper surface portion of the rear member portion 2c so as to extend along the kick portion 2b and the rear member portion 2c.

  The recess 2f extends from the front-rear direction middle part of the kick part 2b of the upper surface part 2e to the middle part of the rear member part 2c, and the boundary part 2g between the kick part 2b and the rear member part 2c is the most. It is recessed greatly, and it is gradually recessed so that it goes to the front side and the rear side from this boundary part 2g.

  The floor panel 3 is formed with a floor recess 3f corresponding to the recess 2f, and the dash panel 5 is formed with a dash recess (not shown) corresponding to the recess 2f.

  The reinforcing member 10 includes an upper wall portion 10a extending along the recess 2f, left and right side wall portions 10b and 10b extending downward from the left and right edges of the upper wall portion 10a, and the left and right sides. It has a cross-sectional hat shape having left and right reinforcing flange portions 10c and 10c bent outward in the vehicle width direction at the lower edge of the wall portion 10b. Further, a reinforcing bead 10d extending along the upper wall portion 10a is recessed.

  The reinforcing member 10 is disposed so as to extend from the floor recess 3f into the dash recess, and covers the recess 2f from above. Thereby, the reinforcing member 10 is substantially flush with the general surfaces of the floor panel 3 and the dash panel 5.

  The front end portion 10f of the reinforcing member 10 is located at the center in the front-rear direction of the upper surface portion 2e of the kick portion 2b, and the rear end portion 10e is located in the vicinity of the front flange portion 8a of the cross member 8.

  The left and right reinforcing flange portions 10a and 10a of the reinforcing member 10 are overlapped with the left and right flange portions 2d of the concave portion 2f together with the floor concave portion 3f and the dash concave portion, and are integrally coupled by welding.

  The reinforcing member 10 is formed such that the entire cross-sectional height h including the reinforcing member 10 from the kick portion 2b to the rear member portion 2c is substantially constant. That is, the cross-sectional area including the reinforcing member 10 from the kick portion 2b to the rear member portion 2c is substantially constant.

  The height of the reinforcing member 10 corresponding to the boundary 2g is the highest, and the height gradually decreases from this position toward the front side and the rear side. Thus, when viewed from the side of the vehicle, the upper wall surface 10a of the reinforcing member 10 forms a substantially continuous surface with the general surface of the side member 2, and the front end portion 10f and the rear end portion 10e are smooth on the general surface of the side member 2. It is connected to.

  Here, as shown in FIGS. 4 and 5, as the ratio α = h1 / (h1 + h2) of the height h1 of the reinforcing member 10 to the sum (h1 + h2) of the height of the concave portion 2f and the reinforcing member 10 increases, the resistance becomes higher. The load F is large. In the present embodiment, the size of the recess 2f and the size of the reinforcing member 10 is set so that the ratio α at the boundary 2g is larger than 0.2.

  According to the present embodiment, the concave portion 2f is formed in the portion of the upper surface portion 2e of the left and right side members 2 extending from the kick portion 2b to the rear member portion 2c, and the reinforcing member 10 is disposed so as to cover the concave portion 2f, Since they are coupled, the bending rigidity of the kick portion 2b can be increased, the load at the time of the vehicle collision can be transmitted to the rear of the vehicle, and therefore the kick portion 2b can be prevented from being bent and deformed at the time of the vehicle collision.

  That is, due to the collision load, a bending moment centering around the boundary 2g (center axis is the vehicle width direction) and an axial force in the front-rear direction are applied to the kick portion 2b, and in particular, the load on the upper surface of the kick portion 2b increases. . For this reason, it becomes possible to prevent bending deformation by reinforcing the boundary portion 2g with the reinforcing member 10 having high strength.

  In the present embodiment, the reinforcing member 10 is formed such that the cross-sectional height h from the kick portion 2b to the rear member portion 2c is substantially constant. This can be avoided, and local deformation of the side member 2 can be prevented. Thereby, a collision load can be absorbed efficiently, without increasing the number of parts and vehicle body weight by addition of a new reinforcement member.

  In this embodiment, since the rear end portion 10e of the reinforcing member 10 is positioned in the vicinity of the cross member 8, the collision load can be efficiently transmitted from the reinforcing member 10 to the cross member 8.

  Further, since the reinforcing member 10 is extended to just before the cross member 8, the floor shape behind the cross member 8 can be made flat, and the raising member can be made unnecessary. That is, when the reinforcing member is extended rearward from the cross member, a protrusion is formed on the floor by the extended portion of the reinforcing member, and the raised member is placed on the floor surface so that the extended portion is flush with the extended portion. There is a problem that the number of parts increases and the position of the occupant's foot increases.

  In the above embodiment, the rear end portion of the reinforcing member is positioned in the vicinity of the front flange portion of the cross member. However, in the present invention, the rear end portion may be extended so as to overlap the front portion of the cross member. .

DESCRIPTION OF SYMBOLS 1 Front vehicle body 2 Side member 2a Front member part 2b Kick part 2c Rear member part 2e Upper slope 2f Recessed part 8 Cross member 10 Reinforcement member h Section height

Claims (2)

A left and right side member having a front member portion extending in the longitudinal direction of the vehicle, a kick portion extending obliquely downward rearward after the front member portion, and a rear member portion extending rearward of the vehicle following the kick portion; A front body structure of an automobile including a reinforcing member disposed on an upper surface of the kick portion of the left and right side members,
A recess is formed on the upper surface of the boundary between the kick member and at least the rear member, so as to follow the upper surface.
The front part of an automobile, wherein the reinforcing member is coupled to the kick part so as to cover the concave part, and is formed so that a cross-sectional height from the kick part to the rear member part is substantially constant. Body structure. The front body structure of an automobile according to claim 1,
Cross members extending in the vehicle width direction are disposed on the upper surfaces of the left and right rear member portions,
A vehicle body structure for a front part of an automobile, wherein a rear end portion of the reinforcing member is located in the vicinity of the cross member or extends so as to overlap with a front portion of the cross member.

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