JP2012091701A - Vehicle body front structure of automobile - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a vehicle body front structure of an automobile which can reduce weight and cost, by restraining deformation of side members by input from the vehicle front by a simple structure.SOLUTION: Right-left side members 9 and 9 are installed on right-left side members 2 and 2 via a lower bracket 6 extended downward from the lower edge of the right-left side members 2 and 2. A bead 16 extending in the vertical direction is arranged in the lower bracket 6. When a load is input from the front to a lower member 11, a radiator support 4 is installed in the lower bracket 6 so that the right-left side members 9 and 9 abut on the bead 16.

Description

  The present invention relates to a vehicle body front structure in which left and right side members have a radiator support attached behind a bumper reinforcement, and an impact absorbing member is attached to a front end of a lower member of the radiator support.

  As a vehicle body front part structure for protecting a leg part of a pedestrian, there is one in which an impact absorbing member is attached to a lower member of the radiator support. However, at the time of a collision with a pedestrian, the lower end portion of the side member of the radiator support is deformed by an input from the leg portion of the pedestrian to the lower member, and the shock absorbing member cannot receive the entire input. There is a problem that the performance of leg protection cannot be obtained sufficiently.

  As a solution to the above problem, for example, in Patent Document 1, for example, bumper reinforcement and a lower member or a side member of a radiator support are rotatably connected via a pin by a connecting member, and input from the front is performed. And the structure which suppresses a deformation | transformation of the said lower member or a side member is disclosed.

JP 2010-89736 A

  However, in the structure of Patent Document 1, since the bumper reinforcement and the radiator support are rotatably connected by a connecting member that is a relatively large separate part, the structure becomes complicated, and the number of parts and assembly man-hours increase. There is a problem in that it causes an increase in weight and cost.

  The present invention has been made in view of the above-described conventional situation, and can reduce the deformation of the side member due to input from the front of the vehicle with a simple structure, and can achieve weight reduction and cost reduction. It is an object to provide a vehicle body front structure.

  The invention of claim 1 attaches bumper reinforcement extending in the vehicle width direction to the front ends of the left and right side members extending rearward of the vehicle, and is rearward of the bumper reinforcement and between the left and right side members. A vehicle body front of an automobile in which a substantially sill-shaped radiator support consisting of an upper member and a lower member extending in the vehicle width direction and left and right side members extending in the vertical direction is attached, and an impact absorbing member is attached to the front end of the lower member In the part structure, the left and right side members are attached to the left and right side members via a lower bracket extending below the lower edges of the left and right side members, and are vertically attached to the lower bracket. A bead extending to the lower member, and when a load is applied to the lower member from the front, the left and right side members are in contact with the bead. The eta support is characterized in that attached to the lower bracket.

  According to the present invention, the lower bracket for attaching the left and right side members to the left and right side members is provided with a bead extending vertically, and when a load from a pedestrian is input to the lower member, Since the left and right side members are configured to come into contact with the beads, the left and right side members can be prevented from being deformed rearward by the input, and the strength to dispel the pedestrian's legs can be secured. It is possible to secure the pedestrian's leg protection performance.

  Further, since the bead is provided on the lower bracket, the rigidity of the lower bracket itself is increased, and the load on the left and right side members can be reliably distributed to the left and right side members.

  Further, the bead is provided on the relatively small lower bracket, and the left and right side members can be prevented from being deformed rearward simply by arranging the side members so as to be able to contact the lower bracket. Compared with the case of connecting via a pin with a relatively large connecting member, the structure is simple, and weight reduction and cost reduction can be achieved.

It is a front view which shows the front part structure of the motor vehicle by Example 1 of this invention. FIG. 2 is a cross-sectional side view (cross-sectional view taken along the line II-II in FIG. 1) showing the front structure. FIG. 3 is a cross-sectional plan view (a cross-sectional view taken along line III-III in FIG. 2) showing the lower bracket. It is a cross-sectional front view (IV-IV sectional view taken on the line of FIG. 2) which shows an upper bracket and the said lower bracket.

  Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings.

  1 to 4 are views for explaining a vehicle body front structure according to a first embodiment of the present invention. In this embodiment, the terms “up”, “down”, “left”, and “right” mean “up”, “down”, “left”, and “right” when viewed in the forward direction of the vehicle unless otherwise specified.

  In the figure, reference numeral 1 denotes a front part of a vehicle body. The vehicle body front portion 1 is made of sheet metal left and right side members 2 and 2 extending in the vehicle front-rear direction, and extends in the vehicle width direction and spans the front end surfaces 2a and 2a of the left and right side members 2 and 2. It is provided with a bumper reinforcement 3 made of sheet metal fixed and handed over, and a radiator support 4 also made of sheet metal.

  The left and right side members 2, 2 are a hat-shaped member body 2b that opens outward in the vehicle width direction, and a strip-shaped plate member that is coupled to the member body 2b so as to close the opening. 2c forms a closed section extending in the vehicle front-rear direction.

  Lid members 21 and 21 for closing the front end openings are joined to the front end portions 2a and 2a of the left and right side members 2 and 2 by welding or the like. A central flat surface portion 3d of the bumper reinforcement 3 is coupled to the front surfaces 21a and 21a of the lid members 21 and 21 by bolts 15a. In addition, 3e is an opening for operation | work, and x mark shows a welding site | part in a figure.

  Upper and lower brackets 5 and 5 and lower brackets 6 and 6 are disposed on the left and right member main bodies 2b and 2b. The upper brackets 5 and 5 are made of sheet metal and have an L shape. The lateral sides 5a and 5a of the upper brackets 5 and 5 are coupled to the upper surfaces 2d and 2d of the left and right member bodies 2b and 2b by welding or the like.

  The lower brackets 6 and 6 are made of sheet metal and have a substantially rectangular flat plate shape extending downward from the lower edges of the left and right side members 2 and 2. Upper portions 6a, 6a of the lower brackets 6, 6 are joined to side surfaces 2e, 2e of the left and right member bodies 2b, 2b by welding or the like.

  And bead 16 is formed in the rear edges 6b and 6b of the lower brackets 6 and 6 so as to extend in the vertical direction and to protrude inward in the vehicle width direction.

  An upper impact absorbing member 7 made of a sheet metal extending in the vehicle width direction is disposed on the front surface of the bumper reinforcement 3, and a resin front extending in the vehicle width direction so as to cover the upper impact absorbing member 7 from the front side. A bumper 8 is provided.

  The upper impact absorbing member 7 has a cross-sectional hat shape bulging forward from the bumper reinforcement 3 so as to be close to the front bumper 8, and an outer peripheral flange 7 a formed at an outer peripheral edge includes the bumper reinforcement 3. The outer peripheral flange 3c is coupled. The left and right end portions of the upper impact absorbing member 7 have dimensions and shapes that cover the front end portions 2a and 2a of the left and right side members 2 and 2 from the front.

  The radiator support 4 has a substantially square shape when viewed from the front. The radiator support 4 is disposed so as to extend between the left and right side members 9 and 9 extending in the vertical direction and the upper end portions 9a and 9a of the left and right side members 9 and 9 extending in the vehicle width direction. The upper member 10 and a lower member 11 disposed between the lower end portions 9b, 9b of the left and right side members 9, 9 are bolted and joined to each other behind the bumper reinforcement 3. And between the left and right side members 2 and 2.

  The lower member 11 includes a lower member body 11a having a hat-like cross section that opens downward, and a reinforcing plate 11b that is disposed and fixed so as to close the opening of the lower member body 11a, and extends in the vehicle width direction. A closed cross section is formed.

  A lower impact absorbing member 12 is disposed between the front edge portion 11 c of the lower member 11 and the lower edge portion 8 a of the front bumper 8. The lower impact absorbing member 12 extends in the vehicle width direction along the lower member 11, and is fixed to the lower member main body 11a by welding or the like.

  A side surface 13b of a fixing bracket 13 having a U-shaped cross section is fixed to the lower end portion 9b of the side member 9 by welding or the like. The bottom surface 13a of the fixing bracket 13 is fixed to the upper surface 11d of the lower member main body 11a by bolts 15b. In addition, 11e is a work opening.

  A hood lock stay 14 extending in the vertical direction is disposed between the bumper reinforcement 3 and the upper member 10. The upper end portion 14 a of the hood lock stay 14 is coupled to the substantially central portion 10 a in the vehicle width direction of the upper member 10, and the lower end portion 14 b is coupled to the upper edge of the substantially central portion 3 a in the vehicle width direction of the bumper reinforcement 3. A hood lock (not shown) provided on the upper member 10 is connected to the central portion 14c.

  The left and right side members 9, 9 are connected to the vertical sides 5b, 5b of the upper brackets 5, 5 with upper mounting portions 9c, 9c of the left, right side members 9, 9 by bolts 15c or the like. Yes. Further, lower mounting portions 9d, 9d of the left and right side members 9, 9 are coupled to the lower portions 6c, 6c of the lower brackets 6, 6 by bolts 15d or the like.

  Here, the left and right side members 9, 9 are arranged so as to face the front edge portion 16a of the bead 16 with a small gap a therebetween. Therefore, when a load is input to the lower member 11 from the front, if the left and right side members 9 and 9 are slightly deformed rearward, the rear end portions 9e and 9e contact the front edge portion 16a of the bead 16. In contact, further deformation will be prevented.

  In the present embodiment, for example, when the vehicle collides with a pedestrian, a load from the leg portion of the pedestrian is input to the lower member 11, whereby the left and right side members 9, 9 are slightly deformed rearward. To do. However, in this embodiment, the lower bracket 6 is provided with the bead 16 so that the left and right side members 9 and 9 can be brought into contact with the rear edge portions 9e and 9e of the bead 16 at the front edge portion 16a. Since it comprised in this, the deformation | transformation to the back after contact | abutting can be suppressed, the intensity | strength which can dispel a pedestrian's leg part can be ensured, and leg part protection performance can be ensured.

  In the present embodiment, the lower brackets 6 and 6 are made of sheet metal, and the lower brackets 6 and 6 are coupled to the side surfaces 2e and 2e of the left and right member main bodies 2b and 2b by spot welding. The load can be received as a load in the shear direction, and peeling of the joint portion can be prevented.

  Further, since the lower brackets 6 and 6 are provided with the beads 16 extending in the vertical direction, the rigidity of the lower brackets 6 and 6 is increased, and the load input from the front to the lower member 11 is applied to the left and right side members. 9 and 9 can be reliably distributed to the left and right side members 2 and 2.

  Further, the left and right sides can be obtained by inputting the bead 16 to the relatively small lower bracket 6 and arranging the side member 9 so that the bead 16 can be brought into contact with the bead 16. The members 9 and 9 can be prevented from being deformed rearward, and the structure is simpler than the conventional structure in which a relatively large connecting member is connected via a pin, thereby reducing weight and cost. be able to.

  In the first embodiment, the bead 16 extending in the vertical direction is provided on the rear edge portion 6b of the lower bracket 6 so that the rear end portion 9e of the side member 9 can be brought into contact therewith. The forming portion is not limited to the rear edge portion 6b of the lower bracket 6, but may be provided at the center portion or the front edge portion of the lower bracket 6 in the front-rear direction.

  For example, as shown by a two-dot chain line in FIG. 3, when the bead 16 'is provided at the center of the lower bracket 6, when the side member 9 is slightly deformed rearward due to a load from the front, the bead 16' The stepped portion 9f that abuts may be provided in the vicinity of the lower mounting portion 9d of the side member 9.

DESCRIPTION OF SYMBOLS 1 Vehicle body front part 2 Side member 2a Front end part 3 Bumper reinforcement 4 Radiator support 6 Lower bracket 9 Side member 10 Upper member 11 Lower member 12 Shock absorbing member (lower part)
16 beads

Claims (1)

A bumper reinforcement extending in the vehicle width direction is attached to the front end portions of the left and right side members extending rearward of the vehicle, and an upper member extending rearwardly of the bumper reinforcement and extending in the vehicle width direction between the left and right side members. And a vehicle body front structure of a vehicle in which a substantially lip-shaped radiator support composed of a lower member and left and right side members extending in the vertical direction is attached, and an impact absorbing member is attached to the front end of the lower member.
The left and right side members are attached to the left and right side members via lower brackets extending downward from lower edges of the left and right side members,
A bead extending in the vertical direction is provided on the lower bracket,
A vehicle body front structure for an automobile, wherein the radiator support is attached to the lower bracket so that the left and right side members come into contact with the bead when a load is input to the lower member from the front. .

Images