JP6339397B2 - Body front structure - Google Patents

Description

  The present invention relates to a vehicle body front structure having a stay to which a bumper beam is fixed.

  In general, a bumper beam constituting a bumper is disposed at the front of the automobile vehicle. The bumper beam extends in the left-right direction, and is fixed to the front end of each side frame extending in the front-rear direction via a stay (see, for example, Patent Document 1). When a load is input to the bumper beam during a vehicle collision, the bumper beam and the vehicle body are deformed to absorb energy.

  In the case of a light collision in which the deformation on the vehicle body does not reach the side frame, it can be repaired by replacing the stay and the bumper beam. On the other hand, in the case of a large collision in which the deformation on the vehicle body reaches the side frame, energy absorption is achieved by the side frame.

JP-A-11-268663

  By the way, the bumper beam is curved so that the center of the left and right sides protrudes forward from the left and right end sides. However, the left and right outer sides are more difficult to transmit the load.

  The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a vehicle body front structure capable of improving performance related to vehicle collision in accordance with the curved shape of the bumper beam. is there.

  In order to achieve the above object, according to the present invention, a pair of left and right side frames extending in the front-rear direction, a bumper beam that is disposed in front of each side frame and protrudes forward from the left and right end sides toward the front side, A pair of left and right stays that extend forward from the front end of each side frame and support the bumper beam, and the rear end side of each stay is more outward than the inner side in the left-right direction with respect to the compressive load in the front-rear direction. A vehicle body front structure with higher drag is provided.

  In the vehicle body front structure, each stay includes a stay main body extending in the front-rear direction and having a closed cross section, and a patch provided on a left and right outer wall on the rear end side of the stay main body. Can do.

  In the vehicle body front part structure, the stay main body may have a polygonal cross section, and the patch may be provided across at least one corner of the stay main body.

  According to the present invention, it is possible to improve the performance related to the vehicle collision corresponding to the curved shape of the bumper beam.

FIG. 1 is an external perspective view of a vehicle body front structure showing an embodiment of the present invention. FIG. 2 is a partial perspective view of the vehicle body front structure. FIG. 3 is a partial plan view of the vehicle body front structure. 4 is a cross-sectional view taken along line AA in FIG. FIGS. 5A and 5B are explanatory views showing a deformed state of the stay at the time of a vehicle collision, in which FIG. 5A shows a state where the stay is deformed, and FIG.

  1 to 5 show an embodiment of the present invention, FIG. 1 is an external perspective view of a vehicle body front structure, FIG. 2 is a partial perspective view of the vehicle body front structure, and FIG. 3 is a vehicle body front structure. FIG. 4 is a cross-sectional view taken along line AA of FIG. 3, and FIG. 5 is an explanatory view showing a deformed state of the stay at the time of a vehicle collision.

  As shown in FIG. 1, the vehicle body 1 is configured by, for example, collecting panel-like members obtained by press-molding steel plates and joining them by spot welding or the like. The vehicle body 1 includes a pair of left and right side frames 10 that extend in the front-rear direction, a bumper beam 20 that is disposed in front of each side frame 10 and extends in the left-right direction, and a stay 30 that extends forward from the front end of each side frame 10 and supports the bumper beam 20. And.

  The vehicle body 1 also includes a toe board 50 that partitions the vehicle compartment and the engine room, and a pair of left and right wheel aprons 60 that partition the front wheel side and the engine room. The vehicle body 1 further includes a radiator lower support 70 that connects the front end sides of the side frames 10 and extends to the left and right, a pair of left and right radiator panels 80 that extend upward from both ends of the radiator lower support 70, and an upper end of the radiator panel 80. And a radiator upper support 90 which is connected and extends to the left and right.

  Each side frame 10 is formed so that the cross section in front view is a rectangular closed cross section. In the present embodiment, each side frame 10 is configured by joining an inner panel and an outer panel. A flange 11 is formed at the front end of the side frame 10 and extends outward from the main body of the side frame 10.

  The bumper beam 20 is curved and formed so that the center portion projects forward from the end portions in the left-right direction. As shown in FIG. 1, the bumper beam 20 is formed so that a cross section in a side view is a closed cross section. In the present embodiment, two closed sections are formed side by side in the vertical direction.

  As shown in FIG. 2, each stay 30 extends in the front-rear direction, a stay main body including an outer panel 31 and an inner panel 32, a connection panel 34 provided at the rear end of the stay main body 31 and connected to the side frame 10, A fixing bracket 35 provided at the front end of the main body 31 and fixed to the bumper beam 20. A patch 33 is provided on the outer panel 31 of the stay body.

  As shown in FIG. 4, the stay body has a polygonal cross section. The outer panel 31 of the stay body includes an upper surface portion 31a extending in the horizontal direction, a first inclined surface portion 31b extending obliquely downward from the left and right outer ends of the upper surface portion 31a toward the left and right outer sides, and a left and right outer side from the lower end of the first inclined surface portion 31b. A second inclined surface portion 31c extending obliquely downward toward the bottom, a vertical surface portion 31d extending downward from the lower end of the second inclined surface portion 31c, and a third inclined surface portion 31e extending obliquely downward from the lower end of the vertical surface portion 31d toward the left and right inside. And a fourth inclined surface portion 31f extending obliquely downward from the lower end of the third inclined surface portion 31e toward the left and right inner sides, and a lower surface portion 31g extending from the lower end of the fourth inclined surface portion 31f toward the left and right inner sides. . The first inclined surface portion 31b is less inclined in the horizontal direction than the second inclined surface portion 31c, and the fourth inclined surface portion 31f is less inclined in the horizontal direction than the third inclined surface portion 31e. Further, the outer panel 31 has an extending portion 31h extending upward from the left and right inner ends of the upper surface portion 31a, and a flange portion 31i extending from the upper end of the extending portion 31h to the left and right inside.

  The inner panel 32 of the stay main body includes an upper surface portion 32h extending in the horizontal direction, a first inclined surface portion 32a extending obliquely downward from the left and right outer ends of the upper surface portion 32h toward the left and right outer sides, and left and right from the lower end of the first inclined surface portion 32a. A second inclined surface portion 32b extending obliquely downward toward the inside, a vertical surface portion 32c extending downward from the lower end of the second inclined surface portion 32b, and a third inclined surface portion extending obliquely downward from the lower end of the vertical surface portion 32c toward the left and right inner sides. 32d, a fourth inclined surface portion 32e extending obliquely downward from the lower end of the third inclined surface portion 32d toward the left and right outer sides, and a lower surface portion 32g extending from the lower end of the fourth inclined surface portion 32e toward the left and right outer sides. Yes. The upper surface portion 31a of the outer panel 31 and the upper surface portion 32h of the inner panel 32 are fixed by spot welding or the like, and the lower surface portion 31g of the outer panel 31 and the lower surface portion 32g of the inner panel 32 are fixed by spot welding or the like.

  The patch 33 is provided on the left and right outer walls on the rear end side of the stay main body. Thereby, the rear end side of the stay 30 has a higher resistance against the compressive load in the front-rear direction on the outer side than on the inner side in the left-right direction. In the present embodiment, the patch 33 is provided on the rear end side of the outer panel 31 of the stay body. The patch 33 includes a vertical surface portion 33a extending in the up and down direction, a first inclined surface portion 33b extending obliquely upward from the upper end of the vertical surface portion 33a toward the left and right inner sides, and extending obliquely downward from the lower end of the vertical surface portion 33a toward the left and right inner sides. A second inclined surface portion 33c. A circular hole 33d is formed in the first inclined surface portion 33b, and a circular hole 33e is formed in the second inclined surface portion 33c.

  The vertical surface portion 33 a of the patch 33 is overlapped with the vertical surface portion 31 d of the outer panel 31, the first inclined surface portion 33 b of the patch 33 is overlapped with the second inclined surface portion 31 c of the outer panel 31, and the second inclined surface portion 33 c of the patch 33 is overlapped with the outer panel 31. It overlaps with the 3rd inclined surface part 31e. That is, the patch 33 is formed across the corner formed by the second inclined surface portion 31c and the vertical surface portion 31d of the outer panel 31 and the corner formed by the vertical surface portion 31d and the third inclined surface portion 31e. .

  The connection panel 34 is formed in a rectangular shape larger than the stay main body 31 in a front view, and is connected to the flange 11 at the front end of the side frame 10. The connection panel 34 and the flange 11 are fastened by bolts 12. The fixing bracket 35 has a shape along the rear portion of the bumper beam 20 and is fixed to the bumper beam 20 by welding or the like.

  In the vehicle body front structure configured as described above, the bumper beam 20 is detachably fixed using the side frame 10 and a plurality of bolts 12 as fastening members via the stay 30. As a result, as shown in FIG. 5 (A), when the bumper beam 20 and the stay 30 are damaged during a light collision, the bumper beam 20 side is replaced with a new one, so that the side frame 10 side can be repaired without any influence. It can be carried out.

  On the other hand, at the time of a large collision, as shown in FIG. 5B, after the stay 30 is crushed in the axial direction, the side frame 10 positioned behind the stay 30 is deformed. At this time, since the bumper beam 20 is curved so that the left and right central sides protrude forward, the load transmission from the bumper beam 20 to the side frame 10 side by the action of the moment is greater on the left and right outer sides than on the left and right inner sides. It is difficult to transmit the load. In the present embodiment, since the patch 33 is provided on the rear end side of the stay main body, the left and right outer sides have a greater resistance against the input in the front-rear direction on the rear end side of the stay. Thereby, after the stay 30 is crushed to some extent, a load can be accurately transmitted to the side frame 10, and the side frame 10 can efficiently absorb energy.

  In addition, since the patch 33 is provided only on the left and right outer sides on the rear end side of the stay main body, crushing of the stay 30 is not hindered during a light collision. Thereby, the stroke amount at the time of the light collision is sufficiently secured, and the performance of the light collision is not impaired.

  In addition, since the cross section of the stay main body is formed in a polygonal shape and the patch 33 is provided across the corner of the stay main body, the stay 30 can be efficiently reinforced by the patch 33. Thereby, a comparatively high drag can be generated at the time of a large collision.

  In the above embodiment, the patch 33 is provided on the left and right outer wall portions of the stay main body. For example, the thickness of the rear end side of the outer panel 31 is changed to the thickness of the rear end side of the inner panel 32. Or the material on the rear end side of the outer panel 31 may be harder than the material on the rear end side of the inner panel 32. Furthermore, for example, the cross-sectional shape of the outside of the rear end of the stay 30 may be different from that of other portions, for example, by changing the number of corners of the polygon of the cross section. In short, it is only necessary that the rear end side of the stay 30 has a higher resistance against the compressive load in the front-rear direction than the inner side in the left-right direction.

  Moreover, in the said embodiment, although the patch 33 provided what straddled two corner | angular parts of a stay main body was shown, how many corner | angular parts may straddle.

  While the embodiments of the present invention have been described above, the embodiments described above do not limit the invention according to the claims. In addition, it should be noted that not all the combinations of features described in the embodiments are essential to the means for solving the problems of the invention.

1 Car body 10 Side frame 20 Bumper beam 30 Stay 31 Outer panel 32 Inner panel 33 Patch

Claims (2)

A pair of left and right side frames extending in the front-rear direction;
A bumper beam that is disposed in front of each side frame and protrudes forward in the left and right center side rather than the left and right end sides;
A pair of left and right stays extending forward from the front end of each side frame and supporting the bumper beam;
The rear end of each stay is to compressive load in the longitudinal direction, drag towards the outside than the inside the lateral direction rather high,
Each stay is
A stay body extending in the front-rear direction and having a closed cross-section;
A vehicle body front portion structure including a patch provided on a left and right outer wall portion on a rear end side of the stay main body . The stay body has a polygonal cross section,
The vehicle body front part structure according to claim 1 , wherein the patch is provided across at least one corner of the stay main body.

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