JP5862050B2 - Body front structure - Google Patents

Description

  The present invention relates to a vehicle body front part structure including a front bumper installed at a front end of a vehicle body.

  In the vehicle front structure including the front bumper, for example, assuming an emergency situation where the pedestrian's leg contacts the front bumper, shock absorption performance (pedestrian leg protection performance) to protect the pedestrian's leg It is demanded to raise. The pedestrian leg protection performance is evaluated by, for example, a pedestrian protection leg test in which an impactor imitating a leg is collided with the front bumper from the front of the vehicle body.

  Patent Document 1 discloses a vehicle body front structure in which an absorber for shock absorption is installed on the inner side and lower side of a front bumper. The rear end side of the absorber is attached to the front surface of the cross member constituting the vehicle body, and the front end side is arranged to face the back side of the front bumper. When a collision object such as a pedestrian's leg collides with the front bumper, the absorber receives the front bumper from the back side and suppresses reaction force to the collision object by deforming itself.

JP 2007-91006 A

  By the way, in order to satisfy the pedestrian leg protection performance, the absorber needs to have a certain dimension or more in the vehicle height direction (height direction).

  In addition, another part such as a skid plate or a spoiler may be attached to the lower part of the front bumper. In the vehicle body front part structure described in Patent Document 1, an attachment structure for attaching another part to the front bumper is formed. This mounting structure has only a function of attaching another part, and does not function as an absorber for shock absorption.

  For this reason, in the lower part of the front bumper, in addition to the height dimension of the absorber tip, the height dimension of the mounting structure that does not contribute to shock absorption performance is required, and the height dimension of the vehicle body front structure is required. I had to get bigger.

  The present invention has been made in view of such problems, and an object of the present invention is to provide a vehicle body front structure that can reduce the height dimension while maintaining the performance of absorbing an impact from the front of the vehicle body.

In order to solve the above problems, a typical structure of a vehicle body front structure according to the present invention is a vehicle body front structure including a front bumper installed at a front end of a vehicle body, and is arranged along a vehicle width direction at a lower portion of the front bumper. The formed flange portion, the rib formed at a predetermined interval along the vehicle width direction protruding forward from the front surface of the flange portion, and the vertical wall portion contacting the rear surface of the flange portion, and the front of the vehicle body via the rib The flange portion is formed with mounting portions to which other parts are mounted at predetermined intervals along the vehicle width direction, and the ribs and the mounting portions are the vehicle width of the flange portion. It characterized that you have been formed alternately over the direction.

According to the above configuration, the rib is formed on the front surface of the flange portion, and the vertical wall portion of the absorber is in contact with the rear surface. For this reason, the impact from the front of the vehicle body is transmitted to the absorber through the rib and absorbed. In addition , mounting portions for mounting other parts are formed on the flange portion alternately with ribs across the vehicle width direction of the flange portion and do not interfere with each other. For this reason, a structure including a rib necessary for receiving an impact and a structure including a mounting portion necessary for mounting another part can coexist in the vehicle width direction of the flange portion, that is, the left-right direction. Therefore, the dimension in the height direction including both structures may be the width dimension in the height direction of the flange portion . Therefore, the height direction dimension of the vehicle body front structure can be reduced while maintaining the performance of absorbing the impact from the front of the vehicle body. In addition, since the ribs and the attachment portions are alternately formed across the vehicle width direction of the flange portion, the impact from the front of the vehicle body can be uniformly received by the ribs extending in the vehicle width direction of the flange portion and transmitted to the absorber. Moreover, another part can be stably attached to the attachment part over the vehicle width direction of a flange part.

  The hardness of the rib is preferably equal to or greater than the hardness of the absorber. Thereby, the impact from the front of the vehicle body is reliably transmitted to the absorber through the rib without collapsing the shape of the rib at the time of collision. In addition, rigidity can be improved by adjusting a thickness and a dimension of a rib.

  The dimension in the height direction of the rib is preferably substantially the same as the dimension in the height direction of the vertical wall portion of the absorber. Thereby, the rib does not have insufficient rigidity for transmitting an impact to the absorber, and contributes to reducing the dimension in the height direction.

  ADVANTAGE OF THE INVENTION According to this invention, the vehicle body front part structure which can make the dimension of a height direction small can be provided, maintaining the performance which absorbs the impact from a vehicle body front.

It is a figure showing roughly the body front part structure in this embodiment. It is a figure explaining the state which looked at the vehicle body front part structure of FIG. 1 from the vehicle body front. It is sectional drawing of the vehicle body front part structure of FIG. It is a figure which shows the state which the vehicle body front part structure of FIG. 3 absorbs an impact. It is a figure explaining the vehicle body front part structure of a comparative example.

  Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. The dimensions, materials, and other specific numerical values shown in the embodiments are merely examples for facilitating understanding of the invention, and do not limit the present invention unless otherwise specified. In the present specification and drawings, elements having substantially the same function and configuration are denoted by the same reference numerals, and redundant description is omitted, and elements not directly related to the present invention are not illustrated. To do.

  FIG. 1 is a diagram schematically showing a vehicle body front structure in the present embodiment. FIG. 2 is a diagram illustrating a state in which the vehicle body front part structure of FIG. 1 is viewed from the front of the vehicle body. The vehicle body front structure 100 has a capability of absorbing an impact from the front of the vehicle body. For example, a front bumper 120 installed at the front end of the vehicle body 110 and a pedestrian disposed on the vehicle body rear side below the front bumper 120. And a protective lower absorber (hereinafter referred to as an absorber 130). The rear end of the absorber 130 is installed on the front surface of the bumper member 112 that is a framework near the front end of the vehicle body 110 so as to extend in the vehicle width direction.

  As shown in FIG. 1, the lower portion of the front bumper 120 has a space portion 122 formed such that a central portion in the vehicle width direction is recessed upward. Another part 140 such as a skid plate or a spoiler is attached to the space 122 of the front bumper 120. As shown in FIG. 2, the separate part 140 is attached to the front bumper 120, and the front part covers the lower part of the front bumper 120 and forms a part of the vehicle body front structure 100.

  Further, the front bumper 120 is formed with a lower grill attaching portion 124 for attaching the lower grill 150. As shown in FIG. 1, the lower grill 150 is a member formed in a lattice shape, is attached from the back side of the front bumper 120, and functions as an air intake port for a radiator (not shown). The lower grill 150 is collectively referred to as a so-called front grill together with an upper grill (not shown).

  3 is a cross-sectional view of the vehicle body front structure 100 of FIG. FIG. 3A is a cross-sectional view taken along line AA of the vehicle body front part structure 100 of FIG. 3B is a cross-sectional view taken along the line BB of the vehicle body front structure 100 of FIG. Here, each structure shown in FIG. 3A and FIG. 3B is alternately repeated along the vehicle width direction of the front bumper 120. In FIG. 2, the lower grill 150 is omitted, but for convenience, FIG. 3 also shows a cross section along the vehicle front-rear direction of the lattice located at the lowest position of the lower grill 150.

  The front bumper 120 has a wedge-shaped lower grille mounting portion 124. Further, a mounting hole 152 is formed in the lower grill 150. In the front bumper 120, as shown in FIGS. 3A and 3B, the lower grill 150 is attached by inserting the lower grill attachment portion 124 into the attachment hole 152 of the lower grill 150.

  The front bumper 120 has a flange portion 126 extending in the vertical direction (height direction). The flange part 126 exists in the AA cross section of Fig.3 (a) and the BB cross section of FIG.3 (b), and is formed along the vehicle width direction.

  The front bumper 120 is integrally formed with, for example, a resin-made rib 128 protruding forward from the front surface 126a of the flange portion 126 (see FIG. 3A). The ribs 128 exist in the AA cross section of FIG. 3A, do not exist in the BB cross section of FIG. 3B, and are formed at predetermined intervals along the vehicle width direction. Further, the rib 128 is at a position where the front end faces the back side of the separate part 140, and receives an impact from the front of the vehicle body on the back side of the separate part 140.

  As shown in FIG. 3B, the front bumper 120 has a mounting hole (mounting portion 129) for mounting another component 140 on the base side of the flange portion 126. Further, a wedge-shaped protruding portion 142 is formed on the separate part 140. In the front bumper 120, as shown in FIG. 3B, the separate part 140 is attached by inserting the protruding portion 142 of the separate part 140 into the attachment part 129. The mounting portions 129 of the front bumper 120 do not exist in the AA cross section in FIG. 3A, exist in the BB cross section in FIG. 3B, and are formed at predetermined intervals along the vehicle width direction. ing.

That is, in the front bumper 120, a shock rib 128 from the front of the vehicle body, a mounting portion 129 for mounting a separate part 140, so as not to interfere with each other, alternately form formed across the vehicle width direction of the flange portion 126 Has been. Therefore, in the vehicle body front part structure 100, a structure including the rib 128 necessary for receiving an impact and a structure including the attachment part 129 necessary for attaching the separate part 140 are cross sections along the vertical direction (for example, Only one of them exists on the AA cross section and the BB cross section), and the flange portion 126 coexists in the vehicle width direction, that is, in the left-right direction.

  Further, on the rear surface 126 b of the flange portion 126, for example, a resin-made absorber 130 that absorbs an impact from the front of the vehicle body via the rib 128 is installed. The rib 128 has a hardness equal to or higher than that of the absorber 130 by adjusting the thickness and dimensions thereof.

  The absorber 130 has a vertical wall portion 132 that contacts the rear surface 126 b of the flange portion 126. As shown in FIG. 3A, the vertical wall portion 132 is disposed so that the height direction position is the same with respect to the rear surface 126b of the flange portion 126 as a mating surface of the rib rear end. It has almost the same dimension as the width dimension La in the height direction. Therefore, the height of the absorber 130 in the height direction is not increased by the vertical wall portion 132, and the rigidity for absorbing the impact is not insufficient.

  Furthermore, the separate part 140 is formed so as to be positioned below the vertical wall part 132 of the absorber 130 in a state of being attached to the attachment part 129 of the front bumper 120, and for example, defines the minimum ground clearance of the vehicle body front part structure 100 To do. As shown in FIGS. 3A and 3B, the separate part 140 is positioned higher than the separate part 140 </ b> A indicated by, for example, a two-dot chain line so as to approach the rib 128 or the vertical wall 132 of the absorber 130. Formed to increase the minimum ground clearance.

  Next, with reference to FIG. 4, the case where a pedestrian protection leg test is implemented with respect to the vehicle body front part structure 100 is demonstrated. In the pedestrian protection leg test, for example, the impactor 160 is made to collide with the front bumper 120 from the front of the vehicle body, and the impact absorption performance (pedestrian leg protection performance) of the vehicle body front structure 100 is evaluated. FIG. 4 is a view showing a state in which the vehicle body front structure 100 of FIG. 3 absorbs an impact.

  When the pedestrian protection leg test is performed, the impact received from the impactor 160 is transmitted from the separate part 140 to the rib 128 of the front bumper 120 as indicated by an arrow in the figure. The hardness of the rib 128 is set equal to or higher than that of the absorber 130 as described above. Therefore, the impact from the front of the vehicle body is reliably transmitted to the absorber 130 via the rib 128 without the rib 128 being deformed.

  And the absorber 130 absorbs an impact and exhibits pedestrian leg protection performance. Therefore, the vehicle body front structure 100 protects the pedestrian's legs by absorbing the impact from the front of the vehicle even when the pedestrian's legs are contacted in an emergency.

  FIG. 5 is a diagram illustrating a vehicle body front structure 100A of a comparative example. Note that FIG. 5 corresponds to FIG. 3A, which is a cross section taken along the line AA, and the same members as those in the vehicle body front structure 100 described above are denoted by the same reference numerals, and description thereof will be omitted as appropriate.

  The vehicle body front part structure 100A is such that the rib 128 for supporting the separate part 140A from the back side is not formed on the front bumper 120A, and the reinforcing thick part 128A is formed, and the tip part 132A of the absorber 130A is the separate part 140A. The vehicle body front structure 100 is different from the vehicle body front structure 100 in that it extends toward the rear side of the vehicle body.

  Here, the mounting structure of the separate part 140A and the front bumper 120A is not shown in the drawing. However, as in FIG. 3B, which is a BB cross section, the mounting structure is separately provided in the mounting hole formed in the base portion of the front bumper 120A. This is achieved by inserting a wedge-shaped protrusion of the part 140A. This attachment structure does not have impact absorption performance and does not contribute to pedestrian leg protection performance. In the absorber 130A, the tip 132A receives an impact from the front of the vehicle body in place of the rib 128, absorbs the impact, and exhibits a pedestrian leg protection performance.

  In the vehicle body front structure 100A, as shown in the figure, an attachment structure for attaching the separate part 140A to the front bumper 120A and a structure including the tip 132A of the absorber 130A necessary for obtaining pedestrian leg protection performance, They are arranged side by side in the vertical direction. As an example, the mounting structure requires a dimension Lb in the height direction. Further, the structure including the tip portion 132A of the absorber 130A requires a dimension Lc in the height direction.

  That is, in the vehicle body front structure 100A, in addition to the dimension Lc of the structure including the tip 132A of the absorber 130A necessary for obtaining the pedestrian leg protection performance, the dimensions of the mounting structure that does not contribute to the pedestrian leg protection performance Lb is also required. As a result, in the vehicle body front part structure 100A, the dimension in the height direction is larger than that of the vehicle body front part structure 100, and accordingly, another part 140A is also positioned below the absorber 130A. That is, the separate part 140A is disposed below the separate part 140 indicated by a solid line, as indicated by a two-dot chain line in FIGS. 3 (a), 3 (b), and 4.

On the other hand, in the present embodiment, as described above, the structure including the rib 128 necessary for receiving the impact and the structure including the mounting portion 129 necessary for mounting the separate part 140 are the flange portion 126. do not interfere with each other made form the vehicle width direction. Therefore, in the vehicle body front structure 100, the height dimension including both structures is the width dimension La in the height direction of the flange portion 126 (see FIG. 3A), and the height dimension is the same. Can be small.

  Further, since the rib 128 set to have a hardness equal to or higher than that of the absorber 130 is positioned in front of the vertical wall portion 132 of the absorber 130, the tip portion 132A of the absorber 130A is different from that of the separate part 140A as in the comparative example. Compared with the case where it extends to the vicinity of the back side, it is possible to exhibit substantially the same pedestrian protection performance. Therefore, in the vehicle body front part structure 100, the dimension in the height direction can be reduced while maintaining the performance of absorbing the impact from the front of the vehicle body.

  Moreover, the vehicle body front part structure 100 may adjust the initial impact at the time of receiving from the vehicle body front by adjusting the hardness of the rib 128. Further, by increasing the minimum ground clearance, for example, the frequency with which the separate component 140 collides with a road surface step or the like can be reduced. In addition, by reducing unnecessary dimensions that do not contribute to pedestrian protection performance, the degree of freedom in adjusting the height of the vehicle increases, so for example, not only design and approach angle, but also so-called lashing performance and towing performance No adverse effect. In addition, it is not necessary to make the dimension of the height direction of the lower grill 150 small, and it can also suppress that the opening as an air intake port reduces.

Furthermore, the vehicle body front structure 100, the rib 128 and the mounting portion 129, since it is made form alternately over the vehicle width direction of the flange portion 126, the vehicle width of the flange portion 126 of the impact from the front of the vehicle body The ribs 128 extending in the direction can be uniformly received and transmitted to the absorber 130. Further, the separate part 140 can be stably attached to the attachment portion 129 of the flange portion 126 in the vehicle width direction.

Note that the rib 128 and the mounting portion 129, as long as they do not interfere with each other made form the vehicle width direction of the flange portion 126 may not necessarily be made form alternately. Even in such a case, the height dimension of the vehicle body front structure 100 can be reduced.

  As mentioned above, although preferred embodiment of this invention was described referring an accompanying drawing, it cannot be overemphasized that this invention is not limited to the example which concerns. It will be apparent to those skilled in the art that various changes and modifications can be made within the scope of the claims, and these are naturally within the technical scope of the present invention. Understood.

  The present invention can be used for a vehicle body front structure including a front bumper installed at the front end of the vehicle body.

DESCRIPTION OF SYMBOLS 100 ... Car body front part structure, 110 ... Car body, 112 ... Bumper member, 120 ... Front bumper, 122 ... Space part, 124 ... Lower grille attachment part, 126 ... Flange part, 126a ... Front surface of a flange part, 126b ... Rear surface of a flange part, 128 ... Ribs, 129 ... Mounting part, 130 ... Absorber, 132 ... Vertical wall part, 140 ... Separate parts, 142 ... Projection part, 150 ... Lower grille, 152 ... Mounting hole, 160 ... Impactor

Claims (3)

In the vehicle body front structure including the front bumper installed at the front end of the vehicle body,
A flange portion formed along the vehicle width direction at the bottom of the front bumper;
Ribs formed at predetermined intervals along the vehicle width direction protruding forward from the front surface of the flange portion;
An absorber that has a vertical wall portion that contacts the rear surface of the flange portion and absorbs an impact from the front of the vehicle body via the rib;
In the flange portion, attachment portions to which other parts are attached are formed at predetermined intervals along the vehicle width direction ,
Wherein the rib and the mounting portion, the vehicle body front structure which is characterized that you have been formed alternately across the vehicle width direction of the flange portion. Vehicle body front structure according to claim 1, the hardness of the rib is characterized in that it is the hardness equal to or higher than the absorber. The vehicle body front part structure according to claim 1 or 2 , wherein a dimension in a height direction of the rib is substantially the same as a dimension in a height direction of the vertical wall portion of the absorber.

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