JP2007090916A - Front part vehicle body structure of automobile - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a front part vehicle body structure of an automobile which suppresses the damage to a head light or the impact on a pedestrian or the like in a light collision. <P>SOLUTION: The head light 9 is fastened to a front bulk head 11 at the near the center of the lower part through a beam bracket 16. The beam bracket side stay 41 is formed on the under surface of a light base 22. The beam bracket side stay 41 expresses an L shape composed of a mounting surface part 41a and a side wall part 41b, and the mounting surface part 41a is connected to a light base 22 by not only the side wall part 41b, but also a mounting boss 42 of stay for repairing. Notches 41c, 42a of fragile parts are formed respectively on the side wall part 41b and the mounting boss 42 of stay for repairing between them and the mounting surface part 41a. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a front body structure of an automobile, and relates to a technique for suppressing damage to a headlight and impact on a pedestrian or the like in a light collision.

In recent years, the front bumpers of four-wheeled vehicles have been painted in the same color as the body panels, and are smoothly connected to front fenders, front garnishes, headlights, and the like. In an automobile equipped with this type of front bumper, there are few steps in the front-rear direction between the front bumper and the headlight, and the headlight may directly collide with other vehicles or pedestrians during a light collision. The headlight is securely and firmly fastened to the rear body frame member (front bulkhead, etc.) to prevent the optical axis from being shaken. It was difficult. As a method for solving such a problem, a method in which a headlight is fixed to a vehicle body skeleton member via a stay provided with a fragile portion and the fragile portion is broken at the time of a collision to absorb collision energy is known. (See Patent Document 1).
JP 2004-115007 A

  In the body of a passenger car or the like, in order to improve the appearance and reduce the air resistance, there is a tendency to set a very small dust (gap) between the front bumper and the headlight. Therefore, when the headlight is fixed to the vehicle body skeleton member as in Patent Document 1, it becomes difficult to make the above-mentioned dust constant due to a manufacturing error or an assembly error, and the appearance is deteriorated. There was also a risk that abnormal noise would occur due to contact between the light and the front bumper. In addition, when the vehicle body skeleton member is positioned immediately after the headlight, the headlight cannot be retreated so much at the time of a collision, and it is difficult to suppress damage to the headlight or impact on a pedestrian or the like.

  The present invention has been made in view of such a background, and an object of the present invention is to provide a front body structure of an automobile that suppresses damage to a headlight and impact on a pedestrian or the like during a light collision.

  The invention according to claim 1 is a front vehicle body structure of an automobile having a headlight installed immediately above the front bumper and a vehicle body skeleton member positioned behind the headlight, and is located on the upper inner side of the front bumper. A bumper upper beam connected to the vehicle body skeleton member via an upper beam bracket having an inclined portion inclined with respect to the longitudinal direction of the vehicle body, and the headlight has a first portion having a fragile portion. It is fixed to the vehicle body frame member via a stay, and a lower part thereof is fixed to the upper beam bracket via a second stay having a fragile portion.

  According to a second aspect of the present invention, in the front body structure of the automobile according to the first aspect, the headlight has a concave portion on the rear surface thereof that forms a predetermined gap with the body frame member. Features.

  According to a third aspect of the present invention, in the front body structure of an automobile according to the first or second aspect, the weak portion is broken when a predetermined load is applied, and the headlight is fastened with a repair stay. It is characterized by having a stay mounting boss for repair provided for

  According to the first aspect of the present invention, even if the dust between the front bumper and the headlight is set to be extremely small, the unevenness of the dust due to the manufacturing error and the assembling error is unlikely to occur, and the appearance is improved or different. Sound prevention is realized. According to the invention of claim 2, damage to the headlight during a light collision is suppressed. According to the invention of claim 3, the headlight can be reused by attaching the repair stay to the headlight when the first stay or the second stay is broken.

Hereinafter, an embodiment of a front body structure of an automobile to which the present invention is applied will be described in detail with reference to the drawings.
FIG. 1 is a perspective view of an automobile according to the embodiment, and FIG. 2 is a developed perspective view of a portion II in FIG. 3 is a side view showing a headlight mounting site, FIG. 4 is a plan view showing the headlight mounting site, and FIG. 5 is a bottom view showing the headlight mounting site. 6 is a cross-sectional view taken along line VI-VI in FIG. 2, FIG. 7 is a perspective view of the mounting portion of the headlight inside the vehicle obliquely viewed from above, and FIG. FIG. 3 is an enlarged perspective view seen from a different angle. FIG. 9 is a perspective view of the mounting portion of the headlight inside the vehicle viewed obliquely from below, and FIG. 10 is a perspective view of the mounting portion of the headlight outside the vehicle viewed obliquely from the rear. FIG. 11 is a diagram for explaining the operation of the embodiment.

<< Configuration of Embodiment >>
<Overall configuration>
As shown in FIG. 1, the present embodiment is an application of the present invention to a four-door passenger car (hereinafter referred to as an automobile). The body 1 of the automobile of the present embodiment adopts a monocoque structure by steel plate panel welding assembly, and its front part is covered with a front bumper 2, left and right fender panels 3 and 4, a bonnet 5, and the like. The front bumper 2 has a shape in which the left and right ends thereof wrap around the wheel arch 6, and includes a grill 7 for introducing running wind into the engine room at the lower front portion. A front garnish 8 is installed between the front bumper 2 and the bonnet 5, and left and right headlights 9 and 10 are installed between the fender panels 3 and 4 and the bonnet 5.

  As shown in FIG. 2, a front bulkhead 11, a wheel house member 12, a bulkhead side frame 13, and the like exist as body frame members at the front portion of the body 1, and the front bumper 2 and the left and right headlights 9. , 10 are directly or indirectly fixed to these body frame members. A bumper upper beam (hereinafter simply referred to as an upper beam) 14 is fixed to the front bulkhead 11 and the wheel house member 12, and the upper end of the front bumper 2 is held by the upper beam 14. A member denoted by reference numeral 15 in FIG. 2 is a support bracket that connects the end of the upper beam 14 to the wheel house member 12.

<Headlight>
As shown in FIGS. 3 and 4, the headlight 9 includes an injection molded lens 21 made of a transparent resin (polycarbonate, etc.) and a resin injection molded product engaged / integrated with the rear portion of the lens 21. The light base 22 is the outer shell. The headlight 9 houses a bulb and an optical axis adjustment mechanism (not shown), and the fitting portion between the lens 21 and the light base 22 is sealed to prevent water and dust from entering the headlight 9. Yes.

[Headlight installation state]
Hereinafter, the mounting state of the headlights 9 and 10 will be described, but since the shapes of the left and right headlights 9 and 10 and their mounting forms are symmetrical, only the left headlight 9 will be described in the present embodiment.

<Upper mounting state>
As shown in FIGS. 4 and 7, a bulkhead side stay 23 and a fender side stay 24 are integrally formed as an upper portion of the headlight 9 as a first stay. The bulkhead-side stay 23 has an L-shape that rises from the upper surface of the light base 22 and goes diagonally inward and rearward, and is fastened to the upper surface of the bulkhead side frame 13 by bolts 25. The fender-side stay 24 has a substantially L-shape that rises slightly from the outside of the bulkhead-side stay 23 on the upper surface of the light base 22 and goes diagonally outward and rearward. Has been. In the case of this embodiment, both the bulkhead side stay 23 and the fender side stay 24 are weak portions whose base ends 23a and 24a are suddenly changed in cross section. A repair stay mounting boss 27 is formed at the base of the bulkhead stay 23.

<Inner end mounting state>
As shown in FIGS. 4 and 7, an upper garnish side stay 31 and a lower garnish side stay 32 are integrally formed at the inner end of the headlight 9. The upper garnish side stay 31 protrudes from the inner upper end of the light base 22 toward the vehicle center side, and has a rectangular hole 31a with which a resin clip (not shown) integrated with the front garnish 8 is engaged. is doing. As shown in FIG. 8, the upper garnish side stay 31 has a rear surface provided with a pin 31 b that fits into a locking hole on the front surface of the bulkhead side frame 13, and a step portion 31 c is formed as a fragile portion. Has been. On the other hand, the lower garnish side stay 32 protrudes obliquely downward from the inner lower end of the light base 22 toward the vehicle center side, and has a fragile portion similar to the upper garnish side stay 31 although not shown. .

<Lower mounting state>
As shown in FIG. 5, the headlight 9 is fastened to the front bulkhead 11 through the beam bracket 16 at the lower center, and the lower outer end is fastened to the wheel house member 12 through the support bracket 15 described above. Has been. As shown in FIGS. 5 and 9, the beam bracket 16 is a press-formed product of a thin steel plate welded and integrated with the lower surface of the upper beam 14 and has a U-shaped cross-sectional shape and is inclined with respect to the longitudinal direction of the vehicle body. It has an inclined portion 16a. Further, as shown in FIGS. 5 and 10, the support bracket 15 is a press-formed product of a thin steel plate having a substantially Z shape, and has an inclined portion 15a inclined with respect to the longitudinal direction of the vehicle body.

  As shown in FIG. 9, the light base 22 has a beam bracket side stay (second stay) 41 and two repair stay mounting bosses 42 and 43 formed on the lower surface thereof. The beam bracket side stay 41 has an L-shape composed of a mounting surface portion 41a and a side wall portion 41b. The mounting surface portion 41a is connected to the light base 22 not only by the side wall portion 41b but also by a repair stay mounting boss 42. Has been. The side wall 41b and the repair stay mounting boss 42 are formed with notches 41c and 42a, which are fragile portions, between the mounting surface 41a. In addition, a clip nut 45 used for fastening the bolt 44 is mounted on the mounting surface portion 41a, and a pin 41d that fits into the locking hole of the beam bracket 16 is projected.

  On the other hand, as shown in FIG. 10, a support bracket side stay (second stay) 51 and a repair stay mounting boss 52 are formed on the side end of the light base 22. The support bracket side stay 51 has a rectangular shape that hangs substantially vertically and is fastened by a bolt 53 while being sandwiched between the upper beam 14 and the support bracket 15. The support bracket side stay 51 is formed with a notch 51a, which is a fragile portion, directly below the repair stay mounting boss 52, and a pair of pins 51b that fit into the locking holes of the support bracket 15 are provided.

  In the case of the present embodiment, since the lower part of the headlight 9 is attached to the beam bracket 16 and the support bracket 15 that support the upper beam 14, the dust between the upper beam 14 and the front bumper 2 that holds the upper part is extremely small. Even if it is set, unevenness in dust due to manufacturing errors and assembly errors and relative movement between the headlight 9 and the front bumper 2 are less likely to occur.

<Gap between headlight and body frame member>
As shown in FIG. 6, a recessed portion 9a is provided at a position corresponding to the wheel house member 12 at the rear portion of the headlight 9, and a predetermined amount in the front-rear direction is provided between the front end of the recessed portion 9a and the front end of the wheel house member 12. The gap L is formed. A similar gap L is also formed between the inner side surface 9 b of the headlight 9 and the front bulkhead 11 in the front-rear direction.

<< Operation of Embodiment >>
When the automobile collides with another vehicle or a pedestrian during traveling, a collision load having a different direction and size is applied to the headlight 9 and the front bumper 2 depending on the collision object, the collision site, and the like. For example, in the example shown in FIG. 11, the headlight 9 is retracted substantially horizontally, and the front bumper 2 is retracted obliquely downward as the beam bracket 16 and the support bracket 15 are deformed. In this case, in this embodiment, the bulkhead side stay 23 and the fender side stay 24 are broken at the base ends 23a and 24a, and the beam bracket side stay 41 and the support bracket side stay 51 are broken at notches 41c, 42a, and 51a. To do. Further, when the headlight 9 and the front garnish 8 move relative to each other, the upper garnish side stay 31 and the lower garnish side stay 32 are also broken at the step portion 31c and the like.

  As a result, the headlight 9 is detached from the front bulkhead 11, the wheel house member 12, the bulkhead side frame 13, the upper beam 14, the front garnish 8, and the like, which are vehicle body skeleton members, and retreats according to the collision energy. In addition, since there is a gap L between the front bulkhead 11 and the wheel house member 12, the headlight 9 retreats with little resistance at the time of a light collision, and the headlight 9 is damaged or has an impact on pedestrians and the like. It became significantly suppressed. In the present embodiment, repair stay mounting bosses 27, 42, 43, 52 are formed in the respective portions of the headlight 9, so that repair is performed instead of the stays 23, 24, 31, 32, 41, 52. By mounting a stay (not shown), the headlight 9 can be reused.

  Although the description of the specific embodiment is finished as described above, the present invention is not limited to the above embodiment and can be widely modified. For example, in the above embodiment, the light base and the stay are integrally formed, but the stay may be fastened to the light base with a screw or the like. In addition, the specific shapes and the like of the headlight, the upper beam, the vehicle body skeleton member, and the like can be changed as appropriate without departing from the spirit of the present invention.

1 is a perspective view of an automobile according to an embodiment. FIG. 2 is a developed perspective view of a portion II in FIG. 1. It is a side view which shows the attachment site | part of a headlight. It is a top view which shows the attachment site | part of a headlight. It is a bottom view which shows the attachment site | part of a headlight. It is VI-VI sectional drawing in FIG. It is the perspective view which looked at the attachment site | part of the vehicle inside of a headlight from diagonally upward. It is the expansion perspective view which looked at the VIII part in FIG. 7 from the angle different from FIG. It is the perspective view which looked at the attachment site | part of the vehicle inner side of a headlight from diagonally downward. It is the perspective view which looked at the attachment part of the vehicle outside of a headlight from diagonally backward. It is operation | movement explanatory drawing of embodiment.

Explanation of symbols

2 Front bumper 9 Headlight 9a Recess 11 Front bulkhead (body frame member)
12 Wheelhouse member (body skeleton member)
13 Bulkhead side frame (body frame)
14 Bumper upper beam 15 Support bracket (bracket)
15a Inclined part 16 Beam bracket (bracket)
16a Inclined portion 23 Bulkhead side stay (first stay)
23a Base end (fragile part)
24 Fender side stay (first stay)
24a Base end (fragile part)
27 Repair stay boss 31 Upper garnish stay 31c Step (fragile)
32 Lower garnish side stay 41 Beam bracket side stay (second stay)
41c notch (fragile part)
42 Repair stay mounting boss 43 Repair stay mounting boss 51 Support bracket side stay (second stay)
51a notch (fragile part)
52 Stay mounting boss for repair L Gap

Claims (3)

A vehicle front body structure having a headlight installed directly above a front bumper and a vehicle body skeleton member located behind the headlight,
A bumper upper beam provided on the inner side of the front bumper and connected to the vehicle body frame member via an upper beam bracket having an inclined portion inclined with respect to the vehicle body longitudinal direction;
The headlight is fixed to the vehicle body frame member through a first stay having an upper portion having a fragile portion, and fixed to the upper beam bracket through a second stay having a lower portion having a fragile portion. The front car body structure of an automobile characterized by   2. The front body structure of an automobile according to claim 1, wherein the headlight has a concave portion that forms a predetermined gap between the headlight and the vehicle body skeleton member on a rear surface thereof. The fragile portion breaks when a predetermined load is applied,
The front body structure of a vehicle according to claim 1 or 2, wherein the headlight includes a repair stay mounting boss used for fastening the repair stay.

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