JP4570976B2 - Bumper skin mounting structure - Google Patents

Description

The present invention has a bumper structure that extends in the vehicle width direction together with the central portion protrudes in the longitudinal direction, to a bumper skin attachment structure body and the thermal expansion coefficient is different bumper skin is attached to the vehicle body.

Bumpers are disposed at the front and rear ends of the automobile so as to extend in the vehicle width direction, so that the impact during a light collision of the automobile can be reduced. In addition, by replacing only the bumper skin damaged at the time of the light collision, it is possible to restore the appearance without much cost. In recent years, a bumper skin that is integrally formed with the vehicle body is arranged around the corners on the front and rear sides of the vehicle body to the side surface. However, in general, the bumper skin is made of a synthetic resin that has a different coefficient of thermal expansion from that of the vehicle body. Therefore, due to thermal contraction and thermal expansion due to changes in the outside air temperature, or due to mounting errors, the vehicle body and the bumper skin particularly at the corners. The consistency was shifted and the appearance was deteriorated. Moreover, there is a possibility that the open deformation of the residual stress due to the error variation at the time of installation at the time of the heat load does not return to the original state even when the heat load is lost, and the appearance is deteriorated with the deviation. Thus, a technique has been proposed that can absorb such a deviation caused by thermal deformation between the vehicle body and the bumper skin (see, for example, Patent Document 1 below).
Japanese Patent Application Laid-Open No. 6-106977 (see claim 1).

  The bumper fascia attachment structure disclosed in Patent Document 1 will be described with reference to FIG. The vehicle body 12 includes a general portion 11A extending in the vehicle width direction and a bumper side portion 11B that wraps around a side portion of the vehicle body 12, and the upper edge of the general portion 11A and the bumper side portion 11B and the end of the bumper side portion 11B. In the mounting part structure of the bumper fascia (skin) 11 having the flange part 13 extending to the side, the flange part of the corner part and the flange part (vertical flange part: not shown) of the general part 11A and the bumper side part 11B. A fixing portion that firmly supports the bumper fascia 11 with respect to the vehicle body 12 is provided in the portion 11B in FIG. 6C, and the flange portion 13 of the general portion 11A. Further, a movement allowing portion 18 that allows the general portion 11A to move substantially in the longitudinal direction of the vehicle body (the length along the radiation L with respect to the camber center O as shown in FIG. 6A). And to) in which it is provided.

  With this configuration, the bumper side portion 11B is firmly fixed to the vehicle body 12 by the fixing portions provided at the corner flange portion and the end flange portion of the general portion 11A and the bumper side portion 11B. Therefore, the bumper side portion 11B is not affected by the general portion 11A that contracts due to a heat change (as shown in FIG. 6C), the parting portion P at the normal position retreats to the position P1 indicated by the chain line at a low temperature, Since it moves forward to the position P2 indicated by the broken line at a high temperature, there is no local undulation, so that the appearance quality can be maintained by appropriately securing the parting part with the vehicle body 12.

  However, in this conventional bumper skin mounting structure, in the bumper fascia 11, the end portion of the bumper side portion 11B is firmly fixed to the general portion 11A that is allowed to move, and the general portion 11A No consideration has been given to the lamp mounting portion in the area. Therefore, there is a possibility that the consistency with the bumper skin in the lamp portion, which is the most conspicuous part in appearance, may be shifted, and it is still insufficient as a measure for appearance quality. Further, the long hole 18 that is the movement allowing portion is only a long hole along the radiation L with respect to the camber center O, and does not correspond to the extended shape of the bumper fascia 11 in the vehicle width direction. When the fascia 11 is deformed and moved, there is a possibility that it interferes with the long hole 18 and a clip or the like inserted into the vehicle body as the bumper skeleton.

Therefore, the present invention solves such problems in the conventional bumper skin mounting structure, secures the mounting consistency between the bumper skin and the lamp portion, and is affected by the mounting error and thermal contraction of the bumper skin. An object of the present invention is to provide a bumper skin mounting structure that can maintain the appearance quality of the lamp portion.

Thus the present invention has a bumper structure that extends in the vehicle width direction together with the central portion protrudes in the longitudinal direction, the bumper skin attachment structure body and the thermal expansion coefficient is different bumper skin is attached to the vehicle body, the vehicle body A bumper skin fixing portion for fixing the bumper skin is provided at the lamp mounting portion, and the bumper skin is fixed to a substantially central portion of the vehicle body by a loose fitting portion that is allowed to move in the front-rear direction. Further, the present invention is characterized in that a long hole attaching portion extending in the longitudinal direction and the front-rear direction of the bumper is formed between the bumper skin fixing portion in the bumper skin and the loose fitting portion in the substantially central portion of the vehicle body. Further, the present invention is characterized in that the shape of the long hole of the long hole mounting portion is formed in a shape along the bumper outer shape. Further, the present invention is characterized in that the longitudinal hole attaching portion is formed to have a larger movement allowance in the front-rear direction as it goes to the center portion, and these are used as means for solving the problems.

According to the present invention, in the bumper skin mounting structure in which a bumper skin having a central portion protruding in the front-rear direction and extending in the vehicle width direction and having a thermal expansion coefficient different from that of the vehicle body is attached to the vehicle body, By providing a bumper skin fixing portion for fixing the bumper skin to the lamp mounting portion, and fixing the bumper skin to a substantially central portion of the vehicle body with a loose fitting portion that allows movement in the front-rear direction, A bumper that is at least most susceptible to mounting errors and heat shrinkage while maintaining the appearance quality of the lamp parts without being affected by bumper skin mounting errors and heat shrinkage, while ensuring mounting consistency in conspicuous lamp parts. Movement in the front-rear direction in the vicinity of the substantially central portion of the epidermis can be absorbed by the loose fitting portion.

In addition, when a long hole attachment portion extending in the longitudinal direction and the front-rear direction of the bumper is formed between the bumper skin fixing portion and the loose fitting portion in the substantially central portion of the vehicle body in the bumper skin, the bumper skin without deformation movement in between the freely fitted portion in the substantially central portion of the fixed portion and the most front-rear direction of the size not car body Xform, by being formed a long hole mounting portion extending in the longitudinal direction and the longitudinal direction of the bumper, the bumper skin The elongated hole mounting portion adapted to the deformation in the resultant force direction of the deformation in the longitudinal direction and the longitudinal direction can effectively absorb the deformation of the bumper skin.

  Furthermore, when the shape of the elongated hole of the elongated hole mounting portion is formed along the outer shape of the bumper, the tolerance of the mounting error of the bumper skin can be effectively expanded and the deformation direction of the bumper skin can be reliably fitted. Can absorb deformation. Furthermore, when the long hole attaching portion is formed to have a large allowable movement in the front-rear direction as it goes toward the center portion, it extends from the bumper skin fixing portion in the ramp portion to the loose fitting portion in the vicinity of the substantially central portion of the bumper skin. The deformation can be effectively absorbed with respect to the deformation of the bumper skin whose deformation in the front-rear direction gradually increases.

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is an exploded perspective view of the left half of a vehicle body when the bumper skin is viewed from above showing one embodiment of the bumper skin mounting structure of the present invention, FIG. 2 is a perspective view showing a fixed state of a bumper skin fixing portion, and FIG. 4 is a cross-sectional view of the bumper skin fixing portion, FIG. 4 is a cross-sectional view in the vicinity of the bumper skin fixing portion, and FIG. 5 is a cross-sectional view of the elongated hole mounting portion (A2 and B2 portions in FIG. 1). As shown in FIG. 1, the basic structure of the bumper skin mounting structure of the present invention has a bumper structure in which the central portion protrudes in the front-rear direction and extends in the vehicle width direction, and has a different thermal expansion coefficient from that of the vehicle body. In the bumper skin mounting structure in which the bumper skin 1 is attached to the vehicle body 2, bumper skin fixing portions A 1 and B 1 for fixing the bumper skin 1 are provided on the lamp mounting portion 3 of the vehicle body 2. The bumper skin 1 is fixed by loose fitting portions A5 and B5 that are allowed to move in the front-rear direction.

As shown in FIG. 1 (A), a lamp (a head lamp in the illustrated example) is attached to both left and right ends (not shown on the right side of the vehicle body) of a metal-made hat-shaped bumper beam 2 on the vehicle body side. A metal lamp bracket 3 is fixed to the base plate with a fixing screw or the like. And the upper edge part of the bumper skin 1 in which the front grill etc. were formed is attached with respect to the said bumper beam 2. FIG. A lamp 5 is attached to the lamp bracket 3 by an appropriate method (not shown). A fixing projection B1 is formed on the lamp bracket 3, and the fixing groove A1 of the resin bumper skin 1 is fitted and fixed to the fixing projection B1 without shifting. As a result, the reference position of the bumper skin 1 with respect to the lamp 5 is determined. The central body aperture B5 formed at a substantially central portion of the vehicle body 2, A5 movement is loosely fitted portion is allowed of the bumper direction before and after that is formed at a substantially central portion of the skin 1 is fixed.

  Between the fixing portions A1 and B1 and the loose fitting portions A5 and B5, long hole attaching portions A2, B2 and A3, B3 and A4, and B4 are formed. About these long hole attaching part A2, A3, A4, as shown in FIG.1 (B) in an enlarged manner, the long hole attaching part extended in the longitudinal direction and the front-back direction of a bumper is formed. While the shape of the long holes of these long hole mounting portions is formed in a shape along the outer shape of the bumper, the movement allowance in the front-rear direction is increased as it goes toward the center portion. By configuring in this way, the allowable range of the mounting error of the bumper skin can be effectively expanded, and at the time of the thermal contraction of the bumper skin due to the heat change, the bumper skin fixing portion A1, B1 to the substantially central portion of the bumper skin. A long hole mounting portion adapted to deformation in the longitudinal direction of the bumper skin and the resultant force direction deformation in the longitudinal direction of the bumper skin with respect to the deformation of the bumper skin in which the deformation in the longitudinal direction gradually increases toward the free fitting portions A5 and B5 in the vicinity. Can effectively absorb the deformation of the bumper epidermis.

  FIG. 2 is a perspective view showing a fixed state of the bumper skin fixing portion, and is a detailed view of the bumper skin fixing portions A1 and B1 in FIG. 1 (A). The related configuration of the fixing projection B1 in the lamp bracket 3 and the fixing groove A1 in the bumper skin 1 is clearly shown. 2B is a perspective view before the bumper skin 1 is attached to the lamp bracket 3, and a receiving portion 6 for receiving the rear edge 1A of the bumper skin 1 is formed on the upper surface of the lamp bracket 3. FIG. The fixing protrusion B1 is formed on the fixing portion that is the attachment reference point of the bumper skin 1. A fixing groove A1 for accurately receiving the fixing protrusion B1 is formed on the rear edge 1A of the bumper skin 1 corresponding to the fixing protrusion B1. FIG. 2A shows a state in which the rear edge 1A of the bumper skin 1 is inserted into the receiving portion 6 on the upper surface of the lamp bracket 3 and fixed.

  FIG. 3 is a cross-sectional view of the bumper skin fixing portion, showing a cross section including the bumper skin fixing portions A1 and B1 in FIG. The fixing state of the bumper skin fixing portions A1 and B1 in which the fixing groove A1 formed on the rear edge 1A of the bumper skin 1 is locked and fixed to the fixing protrusion B1 formed on the upper surface of the lamp bracket 3 is clear. Is shown in FIG. 4 is a cross-sectional view in the vicinity of the bumper skin fixing portions A1 and B1 of FIG. 3, and shows a cross section at a position slightly deviated from the bumper skin fixing portions A1 and B1 in the longitudinal direction of the bumper. The fixed state in which the rear edge 1A of the bumper skin 1 is inserted and fixed to the receiving portion 6 formed on the upper surface of the lamp bracket 3 is clearly shown.

  FIG. 5 is a cross-sectional view of the long hole mounting portion. The long hole attachment portion is an attachment portion between a plurality of bumper beams 2 and the bumper skin 1 that is located between the bumper skin fixing portions A1 and B1 and the loose fitting portions A5 and B5 formed at a substantially central portion of the vehicle body 2. is there. The cross section of the long hole attaching part (part A2, B2 in FIG. 1) closest to the bumper skin fixing parts A1, B1 is shown as a representative. In this cross section, the structure of the bumper beam 2 as the long hole mounting portions A2 and B2 of the first skin hole portion A2 of the bumper skin 1 with respect to the first vehicle body hole portion B2 of the bumper beam 2 in the mounting portion with the lamp bracket 3 at the end portion of the bumper beam 2. Is clearly shown.

  The first skin hole A2 of the bumper skin 1 with respect to the first vehicle body hole B2 of the bumper beam 2 is formed as a long hole extending in the longitudinal direction of the bumper skin 1 and the longitudinal direction of the vehicle body. The clip 7 to be inserted and locked in the portion is configured to clamp the superposed bumper skin 1 and the bumper beam 2 by the elastic force, and thereby, between the clip 7 and the first skin hole portion A2. Even if is loosely fitted, no rattling sound or the like is generated. The upper cover 4 is also attached to the long hole attaching portions A2 and B2 at the same time. The same applies to the other long hole mounting portions A3, B3 and A4, B4, and thus the description thereof is omitted.

As described above, each embodiment of the present invention has been described. Within the scope of the present invention, the shape of the bumper beam (cross-sectional shape such as a hat shape and a rectangular closed cross-sectional shape, and the planar shape conform to the planar shape of the bumper skin. Shape, lamp bracket shape (shape of mounting part to body frame or bumper beam, etc., shape compatible with lamp, etc.), type and lamp mounting form, bumper beam and lamp Mounting form of the bracket (a bumper beam with a bumper skin attached to the lamp bracket may be mounted to allow movement), the shape, type and material of the bumper skin including the grille shape (replaceable resin etc. are adopted) As well as the coefficient of thermal expansion, the shape of the bumper skin fixing part (in addition to fixing via the receiving part, only by fixing protrusions and fixing grooves of appropriate shape Constant may also be employed), the form, the shape of the loosely fitted portion, form, shape of the long hole mounting part, the form and number as well as the front and rear direction movement permission amount of the can be appropriately selected.

FIG. 2 is an exploded perspective view of the left half of the vehicle body as viewed from above the bumper skin according to one embodiment of the bumper skin mounting structure of the present invention. It is a perspective view which shows the fixed state of a bumper skin fixing | fixed part similarly. It is sectional drawing of a bumper skin fixing | fixed part similarly. It is sectional drawing of a bumper skin fixing | fixed part vicinity similarly. It is sectional drawing of a long hole attaching part (A2, B2 part of FIG. 1) same as the above. It is explanatory drawing of the attaching part structure of the conventional bumper fascia.

Explanation of symbols

1 Bumper skin 1A Rear edge 1C Central part 2 Bumper beam (vehicle body)
3 Lamp bracket (lamp mounting part)
4 Upper cover 5 Lamp 6 Receiving part A1 fixing groove (bumper skin fixing part)
B1 fixing protrusion (bumper skin fixing part)
A2 1st skin hole (long hole mounting)
B2 1st body hole (long hole mounting)
A3 2nd skin hole (long hole mounting)
B3 Second body hole (long hole attachment)
A4 3rd skin hole (long hole attachment)
B4 Third body hole (long hole attachment)
A5 Central skin hole (free fitting)
B5 Center body hole (free fitting)

Claims (4)

A bumper skin mounting structure having a bumper structure with a central portion protruding in the front-rear direction and extending in the vehicle width direction, and a bumper skin having a different coefficient of thermal expansion from that of the vehicle body is mounted on the vehicle body. A bumper skin mounting structure characterized in that a bumper skin fixing portion for fixing a skin is provided, and the bumper skin is fixed to a substantially central portion of the vehicle body by a loose fitting portion that allows movement in the front-rear direction. The long hole attachment part extended in the longitudinal direction of a bumper and the front-back direction is formed between the bumper skin fixing | fixed part in the said bumper skin, and the loose fitting part of the substantially vehicle body center part of Claim 1 characterized by the above-mentioned. Bumper skin mounting structure. The bumper skin mounting structure according to claim 2, wherein the shape of the long hole of the long hole mounting portion is formed in a shape along the outer shape of the bumper. 4. The bumper skin mounting structure according to claim 2, wherein the long hole mounting portion is formed to have a larger movement allowance in the front-rear direction as it goes toward the center portion. 5.

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