JP2010132018A - Vehicle body front structure - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To enhance energy absorption performance of a crash box by certainly removing a radiator support from the crash box at front end collision of a vehicle. <P>SOLUTION: A coupling position P1 with the crash box 14 in a connection bracket 40 for connecting the radiator support 20 to the crash box 14 is provided at a front side of a vehicle body relative to a coupling position P2 with the radiator support 20 in the connection bracket 40. At an initial time at the front end collision of the vehicle, coupling of the connection bracket 40 and the crash box 14 is released by destroying an upper mounting part 14C and a lower mounting part 14D provided on the crash box 14 by destroying of a front end part of the crash box 14. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a vehicle body front structure, and more particularly to a vehicle body front structure of a vehicle such as an automobile provided with a crash box at the front end of a front side member.

2. Description of the Related Art Conventionally, a vehicle body front structure of a vehicle such as an automobile having a crash box at the front end of a front side member is known (see, for example, Patent Document 1). In this technique, a load energy absorbing material made of fiber reinforced resin is fastened to both ends of a bumper reinforcement by bolts and nuts.
JP 2007-8283 A

  However, in this vehicle body front portion structure, a radiator support may be coupled to the front end portion of the load energy absorbing material (crash box) with a bolt or the like. In such a case, if the radiator support is not separated from the crash box at the early stage of the frontal collision of the vehicle (full collision and offset collision), it will be disturbed by the radiator support and the axial pressure destruction (axial direction) (Crash caused by compressive load acting on the crushing) cannot be performed, and the energy absorption performance of the crash box is reduced.

  In consideration of the above-described facts, the present invention has an object to provide a vehicle body front structure that can reliably remove a radiator support from a crash box at the time of a vehicle frontal collision and improve the energy absorption performance of the crash box.

  The vehicle body front structure according to the first aspect of the present invention includes a pair of left and right front side members disposed along the vehicle body longitudinal direction at the vehicle width direction lower ends of the vehicle body front portion, and the pair of left and right front side members. A pair of left and right crash boxes that are disposed along the vehicle front-rear direction at the front end and that sequentially breaks from the front side of the vehicle in the event of a vehicle frontal collision and absorbs collision energy, and are provided at the rear of the vehicle from the front ends of the pair of left and right crash boxes A radiator support that supports the radiator, the radiator support and the crash box are coupled to each other, a coupling position with the crash box is provided on the vehicle body front side with respect to the radiator support, and the front surface of the vehicle Breakage of the front end of the crash box at the time of a collision breaks the connection with the crash box. Has a coupling means that, a.

  Therefore, the coupling position of the crash box in the connecting means for coupling the radiator support and the crash box is provided on the front side of the vehicle body with respect to the radiator support, and the front end portion of the crash box at the time of a vehicle front collision is destroyed. As a result, the connection between the crash box and the connecting means is released. For this reason, when the crash box sequentially breaks from the front side of the vehicle body and absorbs the collision energy at the beginning of the frontal collision of the vehicle, the front end of the crash box is destroyed before the radiator support receives the load. Thus, the connection between the connecting means and the crash box is released. As a result, the radiator support can be reliably separated from the crash box in the event of a frontal collision of the vehicle, allowing the crash box to continue stable axial pressure failure without being affected by the radiator support, improving the energy absorption performance of the crash box. it can.

  According to a second aspect of the present invention, in the vehicle body front portion structure according to the first aspect, the connection means has a root portion at a part of the radiator support, and is formed so as to protrude from the root portion toward the front side of the vehicle body. It is a part, The coupling | bonding position with the said crash box provided in this connection part is provided in the vehicle body front side with respect to the base part of the said connection part, It is characterized by the above-mentioned.

  Therefore, the connecting means has a root portion at a part of the radiator support, and is a connecting portion formed to protrude from the root portion to the front side of the vehicle body, and the connecting position of the connecting portion with the crash box provided at the connecting portion is Since it is provided on the vehicle body front side with respect to the root portion, there is no need to manufacture the connecting means as a separate part. As a result, the number of parts can be reduced and productivity can be improved as compared with the configuration of the first aspect.

  The vehicle body front structure according to the first aspect of the present invention can reliably remove the radiator support from the crash box at the time of a vehicle front collision, and can improve the energy absorption performance of the crash box.

  The vehicle body front part structure according to the second aspect of the present invention can reduce the number of parts and improve the productivity.

  A first embodiment of a vehicle body front structure according to the present invention will be described with reference to FIGS.

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

  FIG. 2 is a perspective view of the vehicle body front structure according to the present embodiment as viewed obliquely from the front of the vehicle body, and FIG. 3 is an exploded perspective view. FIG. 1 is an enlarged cross-sectional view taken along the line 1-1 in FIG.

  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 along the vehicle body front-rear direction at the lower portions at both ends in the vehicle width direction. These front side members 12 have a closed cross-sectional structure extending along the longitudinal direction of the vehicle body.

  Crash boxes 14 are respectively provided on the vehicle body front side of the pair of left and right front side members 12, and these crash boxes 14 are made of carbon fiber (CFRP). The pair of left and right crash boxes 14 are disposed along the longitudinal direction of the vehicle body, and the rear end portion 14 </ b> A is coupled to the front end surface 12 </ b> A of each front side member 12. Further, an outer portion in the vehicle width direction of a bumper reinforcement (not shown) is fixed to the front end 14 </ b> B of each crash box 14.

  On the other hand, a radiator support 20 made of a metal such as aluminum is supported on the pair of left and right crash boxes 14, and a radiator (not shown) is attached to the radiator support 20. Further, the radiator support 20 includes an upper horizontal column 22 and lower divided horizontal columns 23, 24, and 25 as a skeleton member. The upper horizontal column 22 and the lower horizontal columns 23, 24, and 25 are used as a skeleton member. The five vertical columns 26, 28, 30, 32, and 34 are connected to each other.

  More specifically, the vehicle width direction intermediate portion 22A and the lower horizontal column 23 of the upper horizontal column 22 are respectively disposed along the vehicle width direction, and the vehicle width direction both end portions 22B and 22C of the upper horizontal column 22 The lower horizontal columns 24 and 25 are inclined from the front in the vehicle width direction to the rear in the vehicle width direction, respectively. Further, the vehicle width direction center portion of the vehicle width direction intermediate portion 22A of the upper horizontal column 22 and the vehicle width direction center portion of the lower horizontal column 23 are connected by a vertical column 26, and the vehicle width direction of the upper horizontal column 22 is Both ends in the vehicle width direction of the intermediate portion 22A and both ends in the vehicle width direction of the lower horizontal column 23 are connected by the vertical column 28 or the vertical column 30. Furthermore, the vehicle width direction outer side portion of the upper horizontal column 22 in the vehicle width direction at both ends 22B and the vehicle width direction outer side portion of the lower horizontal column 24 are connected by the vertical column 32, and both ends of the upper horizontal column 22 in the vehicle width direction are connected. The outer portion in the vehicle width direction of the portion 22 </ b> C and the outer portion in the vehicle width direction of the lower horizontal column 25 are connected by the vertical column 34. For this reason, the radiator support 20 has a ladder structure by the upper horizontal column 22, the lower horizontal columns 23, 24, 25 and the vertical columns 26, 28, 30, 32, 34. Further, from the left and right vertical columns 32 and 34 positioned at the outer end in the vehicle width direction of the radiator support 20, two upper and lower horizontal arms 36 and 38 respectively face the front end 12B of each corresponding front side member 12. A vertical arm 39 that extends and connects the inner ends in the vehicle width direction of the horizontal arms 36 and 38 to each other is fixed to the outer side wall in the front end portion 12B of each front side member 12.

  Each front end portion 14 </ b> C of the pair of left and right crash boxes 14 passes between the upper horizontal column 22 and the lower horizontal column 23 and the vertical columns 26 and 28 or the vertical columns 26 and 30 in the radiator support 20. It has reached the position ahead of the car body.

  As shown in FIG. 3, an upper mounting portion 14D is formed on the upper portion of the front end portion 14C of the pair of left and right crash boxes 14 so as to project upward, and a lower mounting portion 14E is formed on the lower portion of the front end portion 14C. It protrudes downward. Further, the upper mounting portion 14D and the lower mounting portion 14E of the crash box 14 are provided with connection brackets 40 as connection means, and the connection brackets 40 are made of metal such as aluminum.

  As shown in FIG. 1 (only the crash box on the right side of the vehicle body is shown in FIG. 1), the connecting bracket 40 has a trapezoidal shape in plan view. It is fixed to the upper mounting portion 14D or the lower mounting portion 14E by fastening means 42 such as bolts. On the other hand, each vehicle width direction outer side wall portion 40B of the connecting bracket 40 is fixed to a vehicle width direction inner side wall portion 28A of the vertical column 28 by fastening means 44 such as a bolt. Each vehicle width direction outer side wall portion 40B of the connecting bracket 40 is also fixed to the vehicle width direction inner side wall portion 30A of the vertical column 30 by fastening means 44 such as bolts.

  Further, the vehicle width direction inner side wall portion 40A of the connecting bracket 40 is offset to the vehicle body front side with respect to the vehicle width direction outer side wall portion 40B. For this reason, the coupling position (center line of the fastening means 42) P1 between the vehicle width direction inner side wall 40A of the coupling bracket 40 and the crash box 14 is provided on the vehicle body front side with respect to the radiator support 20, and the coupling position P1 is provided on the front side of the vehicle body (from P2) with respect to a coupling position (center line of the fastening means 44) P2 between the vehicle width direction outer side wall portion 40B and the radiator support 20.

  Accordingly, the pair of left and right crash boxes 14 sequentially destroys the axial pressure from the front side of the vehicle body toward the rear side of the vehicle body at the time of the vehicle front collision, so that the upper mounting portion 14D and the lower mounting portion 14E are destroyed at the initial stage of the collision. It has become. As a result, the coupling between the connection bracket 40 and the crash box 14 is released, so that the input load received by the skeleton (vertical columns 28, 30) of the radiator support 20 itself at the time of the front collision of the vehicle is not applied to the crash box 14. It has become.

  The front wall portion 40C that connects the front end edge portion of the vehicle width direction inner side wall portion 40A and the front end edge portion of the vehicle width direction outer side wall portion 40B in the connecting bracket 40 is from the vehicle width direction inner front to the vehicle width direction outer rear. A working hole 46 for attaching the fastening means 42 is formed in the front wall portion 40C. On the other hand, the rear wall portion 40D for connecting the rear end edge portion of the connecting bracket 40 in the vehicle width direction inner wall portion 40A and the rear end edge portion of the vehicle width direction outer side wall portion 40B is formed in the vehicle width direction from the front in the vehicle width direction. Inclined outward and rearward. A work hole 48 for attaching the fastening means 44 is formed in the vehicle width direction outer side wall 28B of the vertical column 28. A work hole 48 for attaching the fastening means 44 is also formed in the outer wall portion 30B in the vehicle width direction of the vertical column 30.

  Next, the operation of this embodiment will be described.

  In the present embodiment, as shown in FIG. 1, the coupling position P1 of the coupling bracket 40 that couples the radiator support 20 and the crash box 14 to the crash box 14 is the coupling position P2 of the coupling bracket 40 to the radiator support 20. The upper mounting portion 14D and the lower mounting portion 14E of the crash box 14 are destroyed by the destruction of the front end portion of the crash box 14 at the time of a front collision of the vehicle. And the connection bracket 40 are released.

  For this reason, the portion of the crash box 14 that protrudes forward from the radiator support 20 to the front of the vehicle body at the beginning of the frontal collision of the vehicle is not affected by the radiator support 20 and is sequentially destroyed by axial pressure from the front side to absorb the collision energy. To do. Further, before the radiator support 20 receives a load by the collision body, the crash box 14 is sequentially subjected to axial pressure failure from the front side of the vehicle body and the front end portion is destroyed, so that the crash box 14 is connected to the radiator support 20 from the coupling position P2. The front part of the car body is destroyed. For this reason, the upper mounting portion 14D and the lower mounting portion 14E in the crash box 14 set on the front side of the vehicle body from the coupling position P2 are destroyed. As a result, the connection between the crash box 14 and the connection bracket 40 at the connection position P1 is released.

  As described above, in the present embodiment, the radiator support 20 is reliably detached from the crash box 14 before the impact is exerted on the crash box 14 by the collision body at the time of a vehicle front collision. Can be made. For this reason, since the crash box 14 can continue the stable axial pressure destruction without being influenced by the radiator support 20 in the part at the rear of the vehicle body from the radiator support 20 as well as the part at the front of the vehicle body from the radiator support 20, The energy absorption performance of the box 14 can be improved.

  In the present embodiment, the connection bracket 40 may be connected to the radiator support 20 and the crash box 14 by welding or the like, and in this case, the connection surface (connection position) of the connection bracket 40 to the crash box 14. Is configured to be provided on the front side of the vehicle body so as not to overlap in the longitudinal direction of the vehicle body with respect to the coupling surface (coupling position) of the connecting bracket 40 to the radiator support 20.

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

  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. 4, in the present embodiment, a connecting portion 60 as a connecting means protrudes from the inner side in the vehicle width direction of the vertical column 28 in the radiator support 20 toward the inner front in the vehicle width direction. That is, instead of the connection bracket 40 in the first embodiment, a connection portion 60 as a connection means is formed to protrude from a part of the radiator support 20.

  The connection portion 60 has a trapezoidal shape in plan view, and the inner side wall portion 60A in the vehicle width direction is fixed to the upper mounting portion 14D or the lower mounting portion 14E of the crash box 14 by fastening means 42 such as bolts. On the other hand, the connecting portion 60 has a root portion (outer rear end portion in the vehicle width direction) 60 </ b> B on the vertical column 28 of the radiator support 20. Further, the vehicle width direction inner side wall portion 60A of the connecting portion 60 is offset to the vehicle body front side with respect to the root portion 60B, and the coupling position P1 between the vehicle width direction inner wall portion 60A and the crash box 14 is the root portion 60B. It is provided on the front side of the vehicle body with respect to (the front wall portion 28C of the vertical column 28).

  Further, the front wall portion 60C that connects the front end edge portion of the vehicle width direction inner side wall portion 60A and the front end edge portion of the root portion 60B in the connecting portion 60 is inclined from the vehicle width direction inner front to the vehicle width direction outer rear. A working hole 46 for attaching the fastening means 42 is formed in the front wall portion 60C. On the other hand, the rear wall portion 60D that connects the rear end edge portion of the connecting portion 60 in the vehicle width direction inner wall portion 60A and the rear end edge portion of the root portion 60B extends from the front in the vehicle width direction to the rear in the vehicle width direction. Is inclined.

  In addition, also in the vertical column 30 in the radiator support 20, a connecting portion 60 as a connecting means projects similarly from the vehicle width direction inner side toward the vehicle width direction inner front.

  Therefore, also in this embodiment, the same effect as the first embodiment can be obtained. Furthermore, in this embodiment, it is not necessary to manufacture the connection means as a separate part (the connection bracket 40 of the first embodiment). As a result, this embodiment can reduce the number of parts and improve the productivity as compared with the first embodiment.

  Although the present invention has been described in detail with respect to specific embodiments, the present invention is not limited to such 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 connecting means in the present invention is not limited to the above-described embodiments, and connects the radiator support 20 and the crash box 14, and the coupling position with the crash box 14 is provided on the front side of the vehicle body with respect to the radiator support 20. In addition, any other connecting means may be used as long as the connection with the crash box 14 is released by the destruction of the front end portion of the crash box 14 at the time of the front collision of the vehicle.

  Further, the radiator support 20 according to the present invention is not limited to the ladder structure including the horizontal columns 22 and 24 and the vertical columns 26, 28, 30, 32, and 34 as in each of the above-described embodiments. Also good.

  Further, the shapes of the front side member and the crash box in the vehicle to which the vehicle body front structure of the present invention is applied are not limited to the above embodiments.

  Moreover, each material of the crash box and the radiator support in the vehicle to which the vehicle body front structure of the present invention is applied is not limited to the above embodiments.

FIG. 3 is an enlarged cross-sectional view taken along a 1-1 cross-sectional line in FIG. 2. It is the perspective view seen from the vehicle diagonal front side which shows the vehicle body front part structure which concerns on 1st Embodiment of this invention. It is the disassembled perspective view seen from the vehicle slanting front outer side which shows the vehicle body front part structure concerning 1st Embodiment of this invention. It is a top view which shows the right side of the vehicle body front part structure which concerns on 2nd Embodiment of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Car body front part 12 Front side member 14 Crash box 14C Crash box upper attachment part 14D Crash box lower attachment part 20 Radiator support 40 Connection bracket (connection means)
40B Vehicle bracket direction outer wall portion of connecting bracket 40A Vehicle bracket direction inner wall portion of connecting bracket 60 Radiator support connecting portion (connecting means)
60A Inner side wall in the vehicle width direction of the connecting portion of the radiator support 60B Root portion of the connecting portion of the radiator support

Claims (2)

A pair of left and right front side members disposed along the longitudinal direction of the vehicle body at both lower ends in the vehicle width direction of the front portion of the vehicle body;
A pair of left and right crash boxes that are disposed along the front-rear direction of the vehicle body at the front ends of the pair of left and right front side members and absorb the collision energy by sequentially breaking from the front side of the vehicle body at the time of a vehicle front collision;
A radiator support that is provided at the rear of the vehicle body from the front ends of the pair of left and right crash boxes and supports the radiator;
The radiator support and the crash box are connected to each other, and the coupling position with the crash box is provided on the vehicle body front side with respect to the radiator support, and the front end portion of the crash box at the time of a vehicle front collision A connecting means for releasing the connection with the crash box by destruction;
A vehicle body front structure.   The connecting means has a root portion in a part of the radiator support, and is a connecting portion formed to project from the root portion to the vehicle body front side, and the coupling position with the crash box provided in the connecting portion is: The vehicle body front portion structure according to claim 1, wherein the vehicle body front portion structure is provided on a vehicle body front side with respect to a root portion of the connecting portion.

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