JP2013169866A - Vehicle body front part structure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a vehicle body front part structure capable of generating lateral load of a vehicle body when minimal wrap collision occurs in the vehicle body and preventing a pressure receiving area from reducing by bumper reinforcement.SOLUTION: A crash box 2 is connected to a front side member 1, and a bumper reinforcement 3 is provided in the crash box 2. A link element 4 that links a portion outer than a portion connected to the crash box 2 in the bumper reinforcement 3 and the front side member 1 is provided. A deformation start part P is formed between a link part of the bumper reinforcement 3 and a link part of the front side member 1, in the link element 4. A partitioning element 5 of which a contact face contacting a deformed link element 4 is formed is arranged in a rearward position from the link part with the link element 4 in an outer surface of the front side member 1.

Description

  The present invention relates to a vehicle body front structure in which an end portion in a longitudinal direction of a bumper reinforcement is projected outward in a vehicle width direction from a front side member.

  The front part of the vehicle body in which the end part in the longitudinal direction of the bumper reinforcement protrudes in the vehicle width direction from the front side member when the bumper reinforcement provided at the front part of the vehicle is attached to the front end part of the front side member. There is a structure. In a vehicle having such a vehicle body front structure, a load is applied only to a portion of the bumper reinforcement that protrudes in the vehicle width direction from the front side member as a frontal collision with an obstacle from the front end. Such a so-called minute wrap collision may occur. When a minute lap collision occurs, it becomes difficult to transmit the load to the front side member, and there is a problem that sufficient energy absorption may not be performed.

  In response to this problem, there is a vehicle body front structure that includes a load transmission mechanism that changes the collision input as a force toward the inside in the vehicle width direction and directly transmits it to the power unit and the side member when a minute lap collision occurs ( For example, see Patent Document 1). In this vehicle body front portion structure, a sub-side member is provided in front of the side member, and the side member and the bumper reinforcement are connected via the sub-side member.

  In addition, a power unit is provided in the front compartment behind the bumper reinforcement and between the side members. Furthermore, a notch is formed on the inner side surface of the sub-side member, and the sub-side member bends in a dogleg shape when a minute lap collision occurs. As a result, the load in the longitudinal direction of the vehicle body caused by the minute lap collision is converted into a lateral load on the vehicle body, and the vehicle body is moved in the lateral direction to enhance the minute lap collision performance.

JP 2004-66932 A

  However, in the vehicle body front structure disclosed in Patent Document 1, a load in the lateral direction of the vehicle body is generated by bending the sub-side member into a dogleg shape. For this reason, bending deformation occurs in the bumper reinforcement as the sub-side member is bent. Therefore, there is a problem that the pressure receiving area with respect to the obstacle is reduced.

  Accordingly, an object of the present invention is to provide a vehicle body front structure that can generate a lateral load on a vehicle body and prevent a decrease in pressure receiving area due to a bumper reinforcement when a minute lap collision occurs in the vehicle body. It is to provide.

  A vehicle body front structure according to the present invention that has solved the above problems is a vehicle body front structure that includes a front side member that is provided on a side of a vehicle body and extends in the front-rear direction of the vehicle body. Is connected to the rear end of the crash box, and the bumper reinforcement that extends in the width direction of the car body at the front end of the crash box extends further outward than the position where the crash box is provided. A connection member for connecting the front side member to a portion outside the portion to which the crash box is connected in the bumper reinforcement and the front side member; and a connecting portion with the bumper reinforcement in the connection member; A deformation starting point portion is formed between the connecting portion with the front side member, and is connected to the outer side surface of the front side member. Rearward of the connecting portion between the members, characterized in that the abutment surface of the coupling member and abuts the deformed is formed.

  In the vehicle body front structure according to the present invention, there is provided a connecting member for connecting a portion outside the portion to which the crash box in the bumper reinforcement is connected and the outer surface of the front side member. For this reason, when a micro lap collision occurs, the connecting member is deformed together with the crash box, thereby preventing deformation of the bumper reinforcement. For this reason, the deformation | transformation of the bumper reinforcement at the time of a micro lap collision can be suppressed, and the reduction of the pressure receiving area in a bumper reinforcement can be prevented. Further, a deformation starting point is formed between the connecting portion of the connecting member with the bumper reinforcement and the connecting portion of the front side member, and more than the connecting portion with the connecting member on the outer surface of the front side member. A contact surface that contacts the deformed connecting member is formed on the rear side. For this reason, after the connecting member is deformed, a load is generated in the lateral direction of the vehicle body by contacting the contact surface. Therefore, when a minute lap collision occurs in the vehicle body, it is possible to generate a lateral load on the vehicle body and to prevent a decrease in pressure receiving area due to the bumper reinforcement.

  Here, a load transmission member for transmitting a load at the time of deformation of the connecting member may be provided in front of the deformation starting point portion of the connecting member and at an inner position of the connecting member.

  As described above, the load transmission member that transmits the load at the time of deformation of the coupling member is provided at the inner position of the coupling member, thereby more efficiently transmitting the load from the bumper reinforcement to the front side member. It can be carried out.

  Further, the contact surface can be arranged further outside than the outer surface of the front side member.

  As described above, the abutment surface is arranged on the outer side of the outer side surface of the front side member, so that the load in the lateral direction of the vehicle body can be expressed early.

  Furthermore, the deformation starting point part in the connecting member can be formed by a weak part made weaker than a position other than the deformation starting point part in the connecting member.

  Thus, since the deformation | transformation origin part in a connection member is formed of the weak part, when a connection member deform | transforms, it can be made to become a start point reliably.

  According to the vehicle body front structure according to the present invention, when a small lap collision occurs in the vehicle body, it is possible to generate a lateral load on the vehicle body and prevent a decrease in pressure receiving area due to bumper reinforcement.

It is a top view of the body front part structure concerning the embodiment of the present invention. (A) is a principal part top view of the vehicle body front structure before a micro lap collision, (b) is a principal part top view of the vehicle body front structure after a micro lap collision. It is a principal part top view of the other example of a vehicle body front part structure. (A)-(d) is a perspective view which shows the other example of a connection member. (A)-(d) is a perspective view which shows the other example of a bracing.

  Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings. In the description of the drawings, the same elements are denoted by the same reference numerals, and redundant description is omitted. For the convenience of illustration, the dimensional ratios in the drawings do not necessarily match those described.

  FIG. 1 is a plan view of a vehicle body front structure according to an embodiment of the present invention. As shown in FIG. 1, in the vehicle body front part structure according to the present embodiment, front side members 1 extending along the longitudinal direction of the vehicle body are provided on the left and right sides of the vehicle body. The front side member 1 absorbs a load input from the front of the vehicle body.

  A rear end portion of the crash box 2 is attached to the front end portion of the front side member 1. The crash box 2 is formed of a material or shape that is easily crushed when subjected to an impact. The crash box 2 absorbs the impact due to the collision by being crushed along the front-rear direction when the vehicle body collides forward.

  Furthermore, a bumper reinforcement 3 extending along the left-right direction of the vehicle body is attached to the tip of the crash box 2. The bumper reinforcement 3 is attached to each of the left and right crash boxes 2. Further, the left end portion of the bumper reinforcement 3 extends to the outside of the front side member 1 arranged on the left side. Similarly, the right end portion of the bumper reinforcement 3 extends to the outside of the front side member 1 disposed on the right side.

  A connecting member 4 is attached between the left end of the bumper reinforcement 3 and the front end of the front side member 1 arranged on the left side. Similarly, a connecting member 4 is attached between the right end portion of the bumper reinforcement 3 and the front end portion of the front side member 1 arranged on the right side.

  Further, a partition member 5 is interposed between the front side member 1 and the crash box 2. The partition member extends from the inner side surface to the outer side surface of the front side member 1, and is curved rearward on the outer side of the front side member 1. This curved portion extends in the longitudinal direction of the vehicle body and protrudes toward the outer side of the vehicle body. The abutting surface of the present invention is formed on the protruding portion. The contact surface by the partition member 5 is disposed outside the outer surface of the front side member 1.

  One end and the other end of the connecting member 4 are bent, and one end is bolted to the bumper reinforcement 3 and attached. Further, the other end portion of the connecting member 4 is bolted and attached to a portion where the other end portion is disposed in front of the front side member 1 in the partition member 5.

  Furthermore, a brace 6 that is a load transmitting member that transmits a load when the connecting member 4 is deformed is provided at an inner position of the connecting member 4. The bracing 6 is made of a plate material and has a quadrangular shape in plan view. One side on the front side is in contact with the bumper reinforcement 3, and one side on the outer side is in contact with the connecting member 4. The bracing 6 is fixed to the connecting member 4 by welding.

  The brace 6 extends to the middle position in the length direction of the connecting member 4 at the contact portion with the connecting member 4 and is fixed to the connecting member 4. The rear end portion of the connection portion of the connection member 4 with the brace 6 serves as a deformation starting point portion of the present invention. For this reason, the bracing 6 is arranged in front of the deformation starting point P. When the connecting member 4 is deformed, the connecting member 4 is deformed with the deformation starting point P as a starting point, and is further greatly deformed at the rear bent portion Q located behind the connecting member 4.

  Next, the operation of the vehicle body front structure according to this embodiment will be described. In the vehicle body front part structure according to the present embodiment, the side part of the bumper reinforcement 3 extends to the outside of the front side member 1. For this reason, as shown in FIG. 2A, when a collision with the obstacle S occurs at a position outside the front side member 1 in the bumper reinforcement 3 and a micro lap collision occurs, A large load is applied to the end of the reinforcement 3.

  When such a micro lap collision occurs, the bumper reinforcement 3 is bent at the end of the bumper reinforcement 3 starting from the position where the front side member 1 is provided, and the pressure receiving area is reduced. It is possible. In this respect, in the vehicle including the vehicle body front part structure according to the present embodiment, as shown in FIG. 2B, when a minute lap collision occurs, the crash box 2 is crushed and the connecting member 4 is deformed starting point P. It is possible to prevent the bumper reinforcement 3 from being bent. As a result, a decrease in the pressure receiving area in the bumper reinforcement 3 can be suppressed.

  Further, the deformation of the connecting member 4 occurs greatly in the rear bent portion Q in addition to the deformation starting point portion P. For this reason, when a load is input from the bumper reinforcement 3 and the connecting member 4 is deformed, the surface behind the deformation starting point P of the connecting member 4 and the contact surface of the partition member 5 come into contact. In this way, when the connecting member 4 and the partition member 5 come into contact with each other, the vehicle body longitudinal load input from the bumper reinforcement 3 to the connecting member 4 is converted into a lateral load. As a result, a load can be generated in the lateral direction of the vehicle body, and the minute lap collision performance can be enhanced.

  Furthermore, in the vehicle body front part structure according to the present embodiment, a bracing 6 for transmitting a load from the bumper reinforcement 3 to the front side member 1 is provided inside the connecting member 4. For this reason, after the connection member 4 and the contact surface of the partition member 5 contact | abut, the transmission of the load with respect to the front side member 1 from the bumper reinforcement 3 can be performed more efficiently.

  Further, the contact surface of the partition member 5 is disposed further outside than the outer surface of the front side member 1. For this reason, the connecting member 4 can be brought into contact with the contact surface of the partition member 5 at an early stage. Therefore, the load in the lateral direction of the vehicle body can be expressed early.

  Next, various modifications of the vehicle body front structure according to the present invention will be described. As a modification of the vehicle body front structure, the shape of the crash box can be adjusted instead of providing the connecting member 4 and the bracing 6. Specifically, as shown in FIG. 3, the crash box 11 can be substantially fan-shaped when viewed from above.

  At this time, one side of the fan shape is arranged along the longitudinal direction of the vehicle body, and the other side is arranged between the end portion of the bumper reinforcement 3 and the outer side portion of the partition member 5 than the front side member 1. Can do. In this case, when a micro lap collision occurs, the surface 11A along the other side of the crash box 11 comes into contact with the contact surface of the partition member 5, and a load in the lateral direction of the vehicle body is generated.

  Moreover, as shown in FIG. 4, it can be set as the thing of a various aspect as a connection member. For example, it can be set as the connection member 21 shown to Fig.4 (a). A connecting member 21 shown in FIG. 4A includes a thick portion 22 and a thin portion 23, and the thick portion 22 and the thin portion 23 are fixed by welding Y. The thick portion 22 is positioned forward and fixed to the bumper reinforcement 3 shown in FIG. 1, and the thin portion 23 is positioned rearward and joined to the partition member 5.

  In this case, the site | part of welding Y becomes a weak part which is weaker than another site | part. Further, the fragile portion functions as a deformation starting point portion P when the connecting member 21 is deformed. As described above, the weakened portion is formed in the connecting member 21 and the weakened portion becomes the deformation starting point P, so that when the connecting member 21 is deformed, the deformation starting point P surely becomes the starting point in the deformation. Can be.

  Moreover, about a weak part, it can also be formed by another aspect. For example, in the connecting member 24 shown in FIG. 4B, a bent portion 24A can be formed at an intermediate position in the longitudinal direction, and the bent portion 24A can be used as a deformation starting point portion. Further, in the connecting member 25 shown in FIG. 4C, a bead 25 </ b> A along the width direction of the connecting member 25 can be formed in the middle in the longitudinal direction. Since the bead 25A along the width direction of the connecting member 25 becomes more fragile than the other parts of the connecting member 25, the part where the bead 25A is formed becomes a fragile part.

  Furthermore, a plurality of beads 26 </ b> A along the extending direction of the connecting member 26 can be formed as in the connecting member 26 shown in FIG. Here, the beads 26 </ b> A are formed on both sides sandwiched between substantially the center positions when viewed in the extending direction of the connecting member 25. The position where the bead 26 </ b> A is formed along the extending direction in the connecting member 26 is stronger than the other positions in the connecting member 26. For this reason, the area | region pinched | interposed into the bead 26A becomes the weak part 26B.

  On the other hand, the bracing 6 can be in various forms. For example, the bracing 31 shown in FIG. 5A is formed by bending a steel material. This bracing 31 includes an upper and lower joint portion 31A and a front and rear joint portion 31B. The braces 31 are attached to the connecting member 4 and the bumper reinforcement 3 through the upper and lower joint portions 31A and the front and rear joint portions 31B.

  Moreover, when setting it as the aspect shown to Fig.5 (a), it can also perform a drawing process instead of performing steel material bending. Furthermore, it may be a columnar bracing 32 shown in FIG. The columnar bracing 32 has a bottom surface substantially the same shape as the bracing 6 shown in FIG. Moreover, this bracing 32 can be formed, for example with resin.

  Or as shown in FIG.5 (c), it can also be set as the bracing 33 combining the board | plate material with two or more sheets here. In this example, one side surface of the upper plate 33A is fixed to the inner side surface of the connecting member 4 by welding Y, and the front surface adjacent to the one side surface is fixed to the bumper reinforcement 3 by welding Y.

  Further, the upper surface of the side plate 33B is fixed to the lower surface side of the other side surface adjacent to the front surface of the upper plate 33A by welding Y, and the lower surface of the side plate 33B is fixed to the upper surface along one side surface of the bottom plate 33C by welding Y. Then, the other side surface of the bottom plate 33C is fixed to the inner side surface of the connecting member 4 by welding Y. In this way, the braces 33 can also be formed.

  Furthermore, the bracing 34 shown in FIG. The brace 34 includes an upper plate 34A, a side plate 34B, and a bottom plate 34C joined in the same manner as the upper plate 33A, the side plate 33B, and the bottom plate 33C of the brace 33. In addition, a back plate 34D fixed by welding Y is provided on the back surfaces of the upper plate 34A, the side plate 34B, and the bottom plate 34C. Such a bracing 34 can also be used.

  DESCRIPTION OF SYMBOLS 1 ... Front side member, 2, 11 ... Crash box, 3 ... Bumper reinforcement, 4, 21-25 ... Connection member, 5 ... Partition member, 6, 31-34 ... Bracing, P ... Deformation origin part.

Claims (4)

A vehicle body front structure provided with a front side member provided on a side of the vehicle body and extending in the front-rear direction of the vehicle body,
The rear end portion of the crash box is connected to the front end portion of the front side member, extends to the front end portion of the crash box in the width direction of the vehicle body, and extends further outward than the position where the crash box is provided. There are existing bumper reinforcements,
A connecting member is provided for connecting the front side member and a portion outside the portion to which the crash box is connected in the bumper reinforcement.
A deformation starting point is formed between the connecting part of the connecting member with the bumper reinforcement and the connecting part of the front side member,
A vehicle body front part structure in which an abutting surface that abuts on the deformed connecting member is formed behind the connecting portion with the connecting member on the outer surface of the front side member.   The vehicle body front according to claim 1, wherein a load transmission member that transmits a load at the time of deformation of the connecting member is provided in front of the deformation starting portion of the connecting member and at an inner position of the connecting member. Part structure.   The vehicle body front part structure according to claim 1 or 2, wherein the contact surface is disposed further outside than an outer surface of the front side member.   The deformation | transformation origin part in the said connection member is formed of the weak part made weaker than positions other than the said deformation | transformation origin part in the said connection member. Body front structure.

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