WO2015119106A1

WO2015119106A1 - Vehicle-body front structure

Info

Publication number: WO2015119106A1
Application number: PCT/JP2015/052972
Authority: WO
Inventors: 陽介菊池; 後藤　陽一
Original assignee: スズキ株式会社
Priority date: 2014-02-05
Filing date: 2015-02-03
Publication date: 2015-08-13
Also published as: JP2015147458A; CN105164006B; JP6237290B2; DE112015000052T5; CN105164006A

Abstract

[Problem] To provide a vehicle-body front structure that can provide sufficient rigidity while ensuring high load-absorbing performance in a fender bracket. [Solution] This vehicle-body front structure (100) comprises a front hood (102), a front fender (110), a vehicle-body structure member (dash side member (120)), and a fender bracket (130). The fender bracket includes: a bulging part (132) that bulges upward and that is fixed to the lower side of the front fender at a position more toward the inner side of the vehicle than an end part, in the vehicle-width direction, of the front hood; an inner flange (134) that extends inward in the vehicle-width direction from a lower end of a vertical wall of the bulging part located on the inner side in the vehicle-width direction; and an outer flange (136) that extends outward in the vehicle-width direction from a lower end of a vertical wall of the bulging part located on the outer side in the vehicle-width direction. The inner flange is fixed to the upper surface of the vehicle-body structure member, and the outer flange constitutes a free end.

Description

Body front structure

The present invention relates to a vehicle body front structure including a front hood of a vehicle.

The front hood of the vehicle constitutes the upper surface of the front part of the vehicle body and covers the upper part of the engine room. A front fender is disposed below the front hood, and the front fender forms a side surface of the front portion of the vehicle body. As a configuration for attaching the front fender to the vehicle body structural member, a configuration in which they are connected via a fender bracket as exemplified in Patent Document 1 is known. By providing the fender bracket as in Patent Document 1, when a collision load is applied to the front hood from above, the load is transmitted to the fender bracket via the fender panel. And it is possible to reduce the impact given to collision bodies, such as a pedestrian, because a fender bracket changes, absorbing a load.

JP 2011-136597 A

As described above, in the conventional configuration as in Patent Document 1, the collision load is absorbed by the fender bracket being deformed. For this reason, in patent document 1, the deformation | transformation at the time of load load is accelerated | stimulated by providing a hole in the vertical wall used as a deformation | transformation location, or providing the fold point used as a load concentration location. However, with such a configuration, the load absorption performance can be improved, but the rigidity of the fender bracket may be insufficient when assembled with the front fender or the vehicle body structural member or during normal times.

The present invention has been made in view of such a problem, and an object of the present invention is to provide a vehicle body front structure capable of obtaining sufficient rigidity while ensuring high load absorption performance in a fender bracket.

In order to solve the above problems, a typical configuration of a vehicle body front structure according to the present invention is a vehicle body front structure that includes a front hood of a vehicle. A front fender disposed over both sides in the vehicle width direction, a vehicle body structural member disposed on the inner side or the lower side of the front fender in the vehicle width direction and extending in the vehicle front-rear direction, and a hat-shaped cross section that opens downward when viewed from the front of the vehicle A fender bracket, and the fender bracket is fixed to the lower side of the front fender on the vehicle inner side than the end portion of the front hood in the vehicle width direction, An inner flange extending inward in the vehicle width direction from the lower end of the vertical wall on the inner side in the vehicle width direction, and an outer flange extending outward in the vehicle width direction from the lower end of the vertical wall on the outer side in the vehicle width direction of the bulging portion. And a Nji, inner flange, be fixed to the upper surface of the body structure member, the outer flange, characterized in that it is an open end.

According to the above configuration, when a collision load from above is applied to the front hood, the load is transmitted to the fender bracket via the front fender. Due to this load, the fender bracket is deformed so that the outer flange serving as the release end and the vertical wall outside the vehicle continuous therewith move downward. Therefore, the front fender that is fixed to the fender bracket, and thus the deformation stroke downward of the front hood, can be sufficiently obtained, and high load absorption performance can be ensured.

On the other hand, since the inner flange is fixed to the upper surface of the vehicle body structural member, the vertical wall inside the vehicle that is continuous with the inner flange does not deform or move downward. As described above, since the vertical wall inside the vehicle does not contribute to load absorption, it is not necessary to provide weak portions such as a lightening and a break point which have been conventionally performed. Therefore, sufficient rigidity can be ensured in the fender bracket. As a result, it is not necessary to increase the thickness of the plate to compensate for the rigidity that has been reduced by the fragile portion, so that it is possible to reduce the weight of the components and the entire vehicle.

The fender bracket may further include an extension portion that extends forward or rearward from the outer flange to the vehicle body structural member at a position spaced from the bulging portion in the vehicle front-rear direction. As a result, the fender bracket is further fixed to the vehicle body structural member at the extension portion that is at a position diagonal to the location where the inner flange is fixed to the vehicle body structural member. For this reason, the rigidity with respect to the tightening torque when using the bolt for fixing the front fender and the fender bracket can be increased. Therefore, it is not necessary to increase the plate thickness in order to ensure rigidity, and it is possible to contribute to weight reduction of parts. Further, since the extension portion is located at a position separated from the bulging portion, the deformation of the bulging portion when a load is applied is not hindered, and the load absorbing performance can be satisfactorily exhibited.

The extension part and the outer flange should be continuous on a plane. Thereby, the continuous part of an extension part and an outside flange can be made easy to change in the up-and-down direction. Accordingly, it is possible to easily deform the outer flange even when the extension portion is fixed to the vehicle body structural member while increasing the fixing strength of the fender bracket to the vehicle body structural member.

The bending angle or curvature radius formed by the top surface of the bulging part and the vertical wall inside the vehicle width direction is larger than the bending angle or curvature radius formed by the vertical wall outside the vehicle width direction and the top surface of the bulging part. Bigger is better. Accordingly, it is possible to promote the downward movement of the vertical wall on the outer side in the vehicle width direction while suppressing the deformation of the vertical wall on the inner side in the vehicle width direction with respect to the load from above.

The vertical wall on the inner side in the vehicle width direction of the bulging portion is substantially perpendicular to the top surface of the bulging portion, and the vertical wall on the outer side in the vehicle width direction of the bulging portion is separated from the top surface of the bulging portion. It is good to incline to the vehicle width direction outer side according to. According to such a configuration, the rigidity against the load from above is increased in the vertical wall on the inner side in the vehicle width direction, so that the deformation can be suitably prevented. In addition, since the vertical wall on the outer side in the vehicle width direction of the bulging portion is inclined outward, the vertical wall applied when a load is applied is easily deformed (moved) outward in the vehicle width direction. Therefore, more deformation strokes can be secured, and the load absorption performance can be further enhanced.

In order to solve the above-mentioned problems, another configuration of the vehicle body front structure according to the present invention is a vehicle body front structure including a vehicle front hood. A front fender disposed over both sides in the width direction, a vehicle body structural member disposed on the inner side or the lower side of the front fender in the vehicle width direction and extending in the vehicle front-rear direction, and a hat that bulges upward in a front view of the vehicle and opens downward A fender bracket having a cross section having a shape, and the top surface of the fender bracket is fixed to the lower side of the front fender inside the vehicle with respect to the end of the front hood in the vehicle width direction. The lower end of the wall is fixed to the upper surface of the vehicle body structural member, and the lower end of the vertical wall on the outer side in the vehicle width direction is an open end. Thus, even if the vertical wall on the inner side in the vehicle width direction and the vertical wall on the outer side in the vehicle width direction are not provided with a flange, the lower end of the vertical wall on the inner side in the vehicle width direction is fixed to the upper surface of the vehicle body structural member. By setting the lower end of the vertical wall on the outer side in the width direction as the open end, the same effect as described above can be obtained.

According to the present invention, in the fender bracket, it is possible to provide a vehicle body front structure capable of obtaining sufficient rigidity while ensuring high load absorption performance.

It is a figure which shows the vehicle body front part structure concerning this embodiment. It is AA sectional drawing of FIG.1 (b). FIG. 3 is a detailed view of the fender bracket shown in FIGS. 1 and 2. It is a figure explaining the deformation | transformation state at the time of the load from upper direction being applied to the vehicle body front part structure shown in FIG. It is a figure explaining the deformation | transformation state at the time of the load from upper direction being applied to the vehicle body front part structure shown in FIG.

DESCRIPTION OF SYMBOLS 100 ... Car body front part structure, 102 ... Front hood, 104 ... Engine room, 110 ... Front fender, 120 ... Dash side member, 130 ... Fender bracket, 132 ... Bumping part, 132a ... Top surface, 132b ... Inner vertical wall, 132c ... Outer vertical wall, 133a ... Bolt hole, 133b ... Bolt hole, 134 ... Inner flange, 136 ... Outer flange, 138 ... Extension, 140 ... Bolt

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 showing a vehicle body front part structure 100 according to the present embodiment. FIG. 1A is a diagram of the right side of the vehicle body front part observed from the left front, and FIG. It is the figure which observed the vehicle body front part structure shown to 1 (a) from upper direction. FIG. 2 is a cross-sectional view taken along the line AA in FIG. For ease of understanding, the front hood 102 is not shown in FIGS. 1A and 1B, and the state in which the front fender 110 is transmitted is shown in FIG. 1B (FIG. 1). 2).

As shown in FIG. 2, the vehicle body front structure 100 according to this embodiment includes a front hood 102 that covers an engine room 104 of a vehicle (the whole is not shown). Below the end of the front hood 102 in the vehicle width direction, a front fender 110 constituting the side surface of the vehicle body front structure 100 is disposed across both sides of the end of the front hood 102 in the vehicle width direction. A dash side member 120, which is a vehicle body structural member that extends in the vehicle front-rear direction, is disposed on the inner side and the lower side of the front fender 110 in the vehicle width direction.

In the present embodiment, the dash side member 120 is exemplified as the vehicle body structural member. However, the present invention is not limited to this, and a member other than the dash side member 120 may be used as the vehicle body structural member. Further, in the present embodiment, the dash side member 120 that is a vehicle body structural member is arranged on the inner side and the lower side of the front fender 110 in the vehicle width direction, but this is only an example, and the vehicle body structural member is a front fender. 110 should just be arrange | positioned in the vehicle width direction inner side or lower side.

As shown in FIGS. 1A and 2, in the vehicle body front structure 100 of the present embodiment, the front fender 110 and the dash side member 120 are connected via a fender bracket 130. As shown in FIG. 2, the fender bracket 130 of the present embodiment has a hat-shaped cross section that opens downward when viewed from the front of the vehicle.

3 is a detailed view of the fender bracket 130 shown in FIGS. 1 and 2, FIG. 3 (a) is a perspective view of the fender bracket 130, and FIG. 3 (b) is a view of the fender bracket 130 of FIG. 3 (a). It is the figure which observed from above. As shown in FIGS. 3A and 3B, the fender bracket 130 of the present embodiment has a bulging portion 132, an inner flange 134, and an outer flange 136.

As shown in FIGS. 2 and 3A, the bulging portion 132 bulges upward, and the front fender is located on the top surface 132a on the vehicle inner side than the end portion of the front hood 102 in the vehicle width direction. 110 is fixed to the lower side (lower surface). As shown in FIGS. 3A and 3B, in the present embodiment,

bolt holes

133a and 133b are formed in the top surface 132a. Then, by inserting the bolt 140 into the

bolt holes

133a and 133b, the fender bracket 130 is fixed to the front fender 110 as shown in FIG. In the present embodiment, the fixing by the bolt 140 is exemplified, but the present invention is not limited to this, and the fender bracket 130 and the front fender 110 may be fixed by other fixing methods.

As shown in FIGS. 2, 3 (a), and 3 (b), in the bulging portion 132, a vertical wall (hereinafter referred to as “below”) extends from the inner edge and the outer edge of the top surface 132 a in the vehicle width direction. The inner vertical wall 132b and the outer vertical wall 132c are respectively extended. In addition, an inner flange 134 extends inward in the vehicle width direction from the lower end of the inner vertical wall 132b, which is a vertical wall on the inner side in the vehicle width direction of the bulging portion 132. An outer flange 136 extends from the lower end of the outer vertical wall 132c, which is a wall, toward the outer side in the vehicle width direction.

As shown in FIG. 2, as a feature of this embodiment, in the fender bracket 130, the inner flange 134 is fixed to the upper surface of the dash side member 120, which is a vehicle body structural member, at welding points A and B (see FIG. 3). . On the other hand, the outer flange 136 is located above the dash side member 120 and serves as a release end. In the present embodiment, welding is exemplified in the fixing of the inner flange 134 to the dash side member 120, but the present invention is not limited to this, and it is also possible to fix them using other methods. Further, in the present embodiment, the configuration in which the outer flange 136 is a release end at a position above the upper surface of the dash side member 120 is illustrated, but this is not a limitation, and the outer flange 136 is not limited to the dash side member 120. It may be located below the upper surface.

4 and 5 are diagrams for explaining a deformation state when a load from above is applied to the vehicle body front structure 100 shown in FIG. When a load is applied to the front hood 102 from above in the vehicle body front structure 100 shown in FIG. 2, the front hood 102 is deformed as shown in FIG. As a result, the lower end of the front hood 102 contacts the front fender 110, and the load applied to the front hood 102 is transmitted to the front fender 110.

When the load is transmitted to the front fender 110, the load is transmitted to the fender bracket 130. As shown in FIG. 5, the load is pushed into the front fender 110 so as to be inclined below the top surface 132a of the fender bracket 130. Deform. At this time, in the present embodiment, the outer flange 136 is a release end that is not fixed to the dash side member 120. For this reason, as shown in FIG. 5, the outer flange 136 and the outer vertical wall 132c continuous therewith move downward from the upper surface of the dash side member 120 and are deformed to be inclined toward the vehicle outer side. As a result, the front fender 110 fixed to the fender bracket 130 and thus the front hood 102 can have a sufficient deformation stroke downward, and high load absorbing performance is ensured.

As described above, the outer flange 136 and the outer vertical wall 132c are deformed by the load, whereas the inner flange 134 is fixed to the upper surface of the dash side member 120. For this reason, as shown in FIGS. 4 and 5, the inner flange 134 and the inner vertical wall 132b continuous thereto do not move downward due to the load. That is, in the vehicle body front structure 100 of this embodiment, the inner vertical wall 132b does not contribute to load absorption. For this reason, it is not necessary to set the weak part like the conventional hollowing or a break point, and sufficient rigidity can be ensured in the fender bracket 130.

In addition, since the outer vertical wall 132c can sufficiently absorb the load by securing a sufficient downward deformation stroke, a fragile portion for accelerating the deformation is unnecessary as in the case of the inner vertical wall 132b. It is. Therefore, according to the vehicle body front structure 100 of the present embodiment, it is not necessary to increase the plate thickness in order to compensate for the rigidity that has been lowered by the fragile portion in the related art, and it is possible to reduce the weight of the components and thus the entire vehicle. .

In particular, in the present embodiment, as shown in FIG. 2, the radius of curvature formed by the top surface 132a of the bulging portion 132 and the inner vertical wall 132b is formed by the outer vertical wall 132c of the bulging portion 132 and the top surface 132a. Greater than radius of curvature. Accordingly, when a load from above is transmitted through the front fender 110, the space between the top surface 132a of the bulging portion 132 and the inner vertical wall 132b is easily deformed, as shown in FIG. As a result, the outer vertical wall 132c can be moved downward without causing deformation of the inner vertical wall 132b. Therefore, it is possible to promote the downward movement of the outer vertical wall 132c while suppressing the deformation of the inner vertical wall 132b, and it is possible to further increase the load absorption performance described above.

In the present embodiment, the case where the top surface 132a of the bulging portion 132 and the inner vertical wall 132b and the outer vertical wall 132c are curved is illustrated, but the present invention is not limited to this. May be bent. In that case, the bending angle formed between the top surface 132a of the bulging portion 132 and the inner vertical wall 132b may be larger than the bending angle formed between the outer vertical wall 132c and the top surface 132a of the bulging portion 132. Needless to say.

Further, in the present embodiment, as shown in FIG. 2, the inner vertical wall 132b is substantially perpendicular to the top surface 132a of the bulging portion 132, and the outer vertical wall 132c is separated from the top surface 132a of the bulging portion 132. It is set to incline outward in the vehicle width direction. That is, in this embodiment, the inner vertical wall 132b and the outer vertical wall 132c extend downward at an asymmetric angle in the vehicle width direction.

According to the above configuration, the inner vertical wall 132b can be increased in rigidity against a load from above, and deformation thereof is preferably prevented. On the other hand, since the outer vertical wall 132c is inclined outward in the vehicle width direction, deformation (movement) toward the outer side in the vehicle width direction can be promoted. Therefore, more deformation strokes can be secured, and the load absorption performance can be further enhanced. Further, the outer vertical wall 132c moves along the outer side in the vehicle width direction of the dash side member 120 while moving along the outer vertical wall 132c, so that the outer vertical wall 132c can be used as a guide during deformation (when moving).

Further, in the present embodiment, as shown in FIG. 3, in the fender bracket 130, an extension portion 138 is provided at a position extending from the outer flange 136 to the rear of the vehicle and spaced from the bulging portion 132 in the vehicle front-rear direction. The fender bracket 130 is fixed to the dash side member 120 (see FIG. 2), which is a vehicle body structural member, by welding at the welding point C in the extension 138.

By providing the extension portion 138 as described above, the fender bracket 130 is fixed to the dash side member 120 at the inner flange 134 and the extension portion 138 at a position diagonal to it. For this reason, the rigidity with respect to the tightening torque when the bolt 140 is used to fix the front fender 110 and the fender bracket 130 as in the present embodiment can be increased. Therefore, it is not necessary to increase the plate thickness to ensure rigidity, and it is possible to contribute to weight reduction of parts. In addition, since the extension portion 138 is located at a position separated from the bulging portion 132, the above-described effect can be reliably obtained without inhibiting the deformation of the bulging portion 132 when a load from above is applied.

In this embodiment, as shown in FIG. 3, the extension 138 and the outer flange 136 are continuous on a plane. Thereby, the continuous part of the extension part 138 and the outer flange 136 is easily deformed in the vertical direction. Therefore, it is possible to increase the fixing strength of the fender bracket 130 to the dash side member 120 without hindering the downward movement (deformation) of the outer flange 136 and the outer vertical wall 132c when a load from above is applied. It becomes.

In the present embodiment, the configuration in which the extension portion 138 is provided at a position where the outer flange 136 extends rearward of the vehicle is illustrated, but the present invention is not limited to this, and the extension portion is extended to a position where the outer flange 136 extends toward the front of the vehicle. Even if 138 is provided, the same effect can be obtained. Moreover, in this embodiment, although the extension part 138 is being fixed to the dash side member 120 by welding, it is not limited also in this, They may be fixed by methods other than welding.

In the embodiment described above, the vertical wall (inner vertical wall 132b) on the inner side in the vehicle width direction and the vertical wall (outer vertical wall 132c) on the outer side in the vehicle width direction of the fender bracket 130 (strictly, the bulging portion 132) are respectively provided. Although the structure which provided a flange in the lower end of this was illustrated, it does not limit to this. In the fender bracket 130 having a hat-shaped cross section that bulges upward and opens downward in a front view of the vehicle, a flange is provided at each lower end of the vertical wall on the inner side in the vehicle width direction and the vertical wall on the outer side in the vehicle width direction. There may be no configuration. In this case, the top surface of the fender bracket 130 is fixed to the lower side of the front fender 110 on the vehicle inner side than the end portion of the front hood 102 in the vehicle width direction, and the lower end of the vertical wall on the vehicle width direction inner side is the vehicle body structural member. The same effect as described above can also be obtained by fixing to the upper surface of the (dash side member 120) and using the lower end of the vertical wall on the outer side in the vehicle width direction as the open end.

The preferred embodiments of the present invention have been described above with reference to the accompanying drawings, but it goes without saying that the present invention is not limited to such examples. 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 hood of a vehicle.

Claims

In the vehicle body front structure including the front hood of the vehicle,
A front fender disposed below both ends of the front hood in the vehicle width direction below the vehicle width direction of the front hood;
A vehicle body structural member disposed on the inner side or the lower side of the front fender and extending in the vehicle longitudinal direction; and
A fender bracket having a hat-shaped cross-section opened downward in front view of the vehicle,
The fender bracket is
A bulging portion that bulges upward and is fixed to the lower side of the front fender on the vehicle inner side than the end of the front hood in the vehicle width direction;
An inner flange extending inward in the vehicle width direction from the lower end of the vertical wall on the inner side in the vehicle width direction of the bulging portion;
An outer flange extending from the lower end of the vertical wall on the outer side in the vehicle width direction of the bulging portion toward the outer side in the vehicle width direction;
The inner flange is fixed to the upper surface of the vehicle body structural member,
The vehicle body front structure, wherein the outer flange is an open end.
The fender bracket further includes an extension portion that extends forward or rearward from the outer flange and is fixed to the vehicle body structural member at a position spaced from the bulging portion in the vehicle front-rear direction. Vehicle body front structure as described.
The vehicle body front structure according to claim 2, wherein the extension portion and the outer flange are continuous in a plane.
The bending angle or curvature radius formed between the top surface of the bulging portion and the vertical wall inside in the vehicle width direction is greater than the bending angle or curvature radius formed between the top wall of the bulging portion and the vertical wall outside in the vehicle width direction. The vehicle body front part structure according to any one of claims 1 to 3, wherein the vehicle body front part structure is also large.
The vertical wall on the inner side in the vehicle width direction of the bulging portion is substantially perpendicular to the top surface of the bulging portion,
5. The vertical wall on the outer side in the vehicle width direction of the bulging portion is inclined outward in the vehicle width direction as the distance from the top surface of the bulging portion increases. Vehicle body front structure as described.
In the vehicle body front structure including the front hood of the vehicle,
A front fender disposed below both ends of the front hood in the vehicle width direction below the vehicle width direction of the front hood;
A vehicle body structural member disposed on the inner side or the lower side of the front fender and extending in the vehicle longitudinal direction; and
A fender bracket having a hat-shaped cross-section that bulges upward and opens downward in front view of the vehicle,
The fender bracket is
The top surface is fixed to the lower side of the front fender on the vehicle inner side than the end of the front hood in the vehicle width direction,
The lower end of the vertical wall on the inner side in the vehicle width direction is fixed to the upper surface of the vehicle body structural member,
A vehicle body front structure characterized in that the lower end of the vertical wall on the outer side in the vehicle width direction is an open end.