JPH07137585A - Installing structure of resin exterior material - Google Patents

Abstract

PURPOSE:To make the tentative attachment of a resin exterior material to a body easier, and to make a deformation of the exterior material owing to a thermal expansion in a modest looking. CONSTITUTION:A bumper 10 made of resin has a main body 11 extending along a body, and bumper sides 12, and it is fixed rigidly to the body side through parts 27 and 32 for fixing. A pair of left and right locking projections 40 and 41 are provided at the rear surface side of the bumper 10. Each of the locking projections 40 and 41 has a horizontal part 45 extending horizontally, and a downward projection 46 extending downward. L-shaped retainers 60 engaged to the projections 40 and 41 are provided to bases 55 installed to a member 28 at the body side rotatable around horizontal shafts. Each of the retainers 60 has the first part 61 pushed down by the locking projection 40 or 41 when the bumper 10 is attached tentatively to the part 28 at the body side, and the second part 62 rotating in the direction to be erected, and the second part 62 is to be engaged to the rear surface 46a of the downward projection 46 form the lower side.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a resin exterior material mounting structure suitable for mounting a synthetic resin exterior material such as an automobile bumper to a body.

[0002]

2. Description of the Related Art Conventionally, automobile bumpers are fixed to a body by fixing parts such as bolts. Bumpers for passenger cars are mainly made of synthetic resin.Recently, in order to make the so-called flash surface of the body line, the bumper side is shaped so as to follow the outline of the body, and both ends of the bumper side are formed. By rigidly fixing the to the body, a sense of unity between the body and the bumper is created.

For example, in the case of the resin bumper 1 shown in FIG. 8, the fixing parts 3 and 4 of the bumper body 2 are attached to the body side by fixing parts such as bolts, and the end 6 of the bumper side 5 is tapping screw or the like. It is rigidly fixed to the body side by the fixing parts of. In this case, in order to absorb the expansion or contraction of the bumper body 2 due to the temperature change, a horizontally elongated hole is provided in the bumper body 2 in the fixing portions 3 and 4, and the bumper is inserted by the stepped bolts into the elongated hole. By supporting the main body 2 on the body side,
It has also been proposed to allow the bumper body 2 to move to some extent in the thermal expansion direction.

A bumper mounting structure using a retainer as disclosed in Japanese Utility Model Publication No. 3-44602 has also been proposed. This prior art retainer is attached to the bumper in advance, and the bumper is rigidly fixed to a member on the body side by a bolt inserted in the retainer. Starting with this conventional technique, a bumper is fitted to the body by a robot or a worker in a body assembly line of an automobile.

[0005]

Since the resin bumper has a considerably large coefficient of thermal expansion, in a body having a flash surface, the bumper becomes hot, for example, when it is exposed to the hot sun in summer. Assuming the amount of thermal expansion at the time of expansion, the positional displacement between the body and the bumper at the time of thermal expansion becomes a problem.

For example, in the mounting structure of the bumper 1 shown in FIG. 8, at normal temperature, the length L1 of the bumper body 2 is 1400 mm, the length L2 of the bumper side 5 is 300 mm, and the distance L3 between the fixing portions 3 and 3 is fixed. Distance L4 between parts 4 and 4 is 800mm and 110, respectively.
When it is 0 mm, thermal expansion ΔL of about 3 mm occurs on both left and right sides as indicated by the chain double-dashed line at high temperature. In this case, a step may occur between the bumper side 5 and the body,
There arises a problem that the edge portion of the bumper side 5 is exposed to the outside of the body.

Therefore, as shown in FIG. 9, the fixing portions 3a,
In 4a, it was also considered that the bumper body 2 was rigidly fixed with fixing parts such as ordinary bolts and flat washers. However, in this case, the bumper body 2 is bent in the front-rear direction at a high temperature as indicated by the chain double-dashed line, and the amount of deformation may reach about 6 mm in the front-rear direction.

Further, as shown in FIG. 10, the fixed portions 3a,
In 4a, a bumper mounting structure in which the bumper body 2 is rigidly fixed with a fixing component such as a normal bolt and a flat washer and the center of the bumper body 2 is held by a retainer 8 has been considered, but in this case, It was found that when the temperature was high, the retainer 8 was deformed by 3 mm in the front-rear direction on both the left and right sides as indicated by the chain double-dashed line, and there was a problem in terms of appearance quality.

If the bumper mounting portion is to be made rigid in order to suppress the deformation due to the above-mentioned thermal expansion, sheet metal lean force or reinforcing ribs are added or the bumper wall thickness is increased to improve surface rigidity or fiber. Major design changes such as the use of reinforced synthetic resin (FRP) were necessary.

Further, in the conventional bumper mounting structure, it is difficult to temporarily attach the bumper to the body when the bumper is assembled to the body by a robot or manually, and there is room for improvement in workability. For example, a bumper using a retainer as described in Japanese Utility Model Publication No. 3-44602 is not only difficult to temporarily attach to a body by a robot or the like, but also has poor workability in final fastening with bolts. There are problems such as.

Therefore, an object of the present invention is to make it possible to make the deformation of a resin exterior material such as a bumper due to thermal expansion inconspicuous by a relatively simple measure, and to easily temporarily attach the exterior material to the body. An object of the present invention is to provide a mounting structure for a resin exterior material that can be used.

[0012]

SUMMARY OF THE INVENTION The present invention, which was developed to achieve the above object, includes a resin exterior material having a main body portion extending along a body, both longitudinal end portions and a longitudinal intermediate portion of the exterior material. Fixing means for fixing to the body side, a horizontal portion integrally formed with the main body portion between the longitudinal center of the exterior material and the intermediate portion on the back surface side of the exterior material, and protruding in the direction of the body; Locking protrusion having a downward convex portion projecting downward from the front end side of the portion, and a base attached to the body-side member so as to be rotatable around a horizontal axis and temporarily attaching the exterior material to the body The front part is in a standing state, and has a first portion that is rotated about the horizontal axis and collapses toward the body side by being pushed by the locking projection when the exterior material is pressed in the body direction. Temporarily attached to Although it is tilted before it goes down, it is engaged with the back side of the downward projection of the locking projection from below by rotating in the upright direction with the rotation of the first portion when the exterior material is pressed in the body direction. And an L-shaped retainer having a second portion for attaching the resin-made exterior material.

[0013]

In the present invention, when attaching the exterior material to the body,
The exterior material is pressed against the body side with the exterior material positioned such that the locking projection of the exterior material is located directly in front of the L-shaped retainer that is previously attached to the body side. By doing so, the first portion of the L-shaped retainer is pushed by the locking projection, so that the L-shaped retainer rotates around the horizontal axis, the first portion falls to the body side, and the second portion stands up. . As a result, the locking projection rides on the retainer, and the second portion of the retainer engages with the downward projection of the locking projection.

In this way, the exterior material is temporarily attached to a predetermined height of the body, and the load applied in the front-rear direction is stopped by the engagement of the second portion of the retainer and the locking projection. After the temporary attachment, the both ends and the intermediate part of the exterior material are fully fastened to the body side by fixing parts such as bolts.

In the exterior material mounting structure of the present invention, both ends and the middle portion of the exterior material are permanently fastened by fixing parts such as bolts, and the portion between the longitudinal center of the exterior material and the intermediate portion is L-shaped. Auxiliary fastening is achieved by engagement between the retainer and the locking projection. In this auxiliary fastening portion, the movement of the exterior material in the front-rear direction is restrained, and the movement other than the front-rear direction is allowed to some extent. By combining this auxiliary fastening and the main fastening, the deformation caused by the thermal expansion of the exterior material at high temperature is suppressed to the extent that the appearance quality is not impaired.

[0016]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS. An automobile rear bumper 10 as an example of the resin exterior material shown in FIG. 1 is a synthetic resin integrally molded product, and is molded into a predetermined bumper shape. This resin bumper 10 is a horizontally long bumper body 1 that extends in the vehicle width direction (horizontal direction) along the back surface of the vehicle body.
1 and bumper sides 12 that are continuous with both ends of the bumper body 11 in the longitudinal direction. The bumper side 12 has a shape that extends from the back surface of the body to the side surface of the body, and the shape along the side surface of the body provides a sense of unity with the body. As shown in FIG. 2 and the like, a license plate attachment portion 13 is provided at the center of the bumper body 11 in the vehicle width direction.

At the terminal 12a of the bumper side 12, a terminal fixing portion 20 projecting toward the body side is provided. The terminal fixing portion 20 extends in the horizontal direction, and is fixed to the body side rigidly by inserting an appropriate fixing component 21 such as a tapping screw into a mounting hole provided in a flange portion inside the tire house. It

A pair of left and right upper end mounting portions 25 that stand upright are provided at the upper edges of the left and right intermediate portions from the center of the bumper body 11 in the longitudinal direction to both ends. Upper end mounting part 2
5 is provided with a hole 26, and an appropriate fixing component 27 such as a bolt inserted in the hole 26 allows the bumper body 11
The upper part of is fixed to the member 28 on the body side. An example of the member 28 on the body side is a rear end panel made of sheet metal.

An intermediate mounting portion 30 is provided near the upper end mounting portion 25. This intermediate mounting portion 30 also has a hole 31
The intermediate mounting portion 30 is fixed to the body-side member 28 by an appropriate fixing component 32 such as a bolt inserted into the hole 31. The upper end mounting portion 25 and the fixing component 27, and the intermediate mounting portion 30 and the fixing component 32 constitute intermediate fixing means.

A pair of locking projections 40 and 41 are provided at the left and right symmetrical positions on the back side of the bumper body 11 respectively.
It is molded integrally with 1. These locking protrusions 40, 4
1 is the center of the bumper body 11 in the longitudinal direction and the intermediate mounting portion 30.
It is provided between and. The locking protrusions 40 and 41 are respectively a horizontal portion 45 extending in the front-rear direction and the horizontal portion 4
5 has a downward convex portion 46 extending downward from the front end side. As shown in FIG. 4, a concave portion 47 is provided at the center of the lower surface of the downward convex portion 46 of the one locking protrusion 41.

The body-side member 28 is provided with a pair of left and right retainer units 50. This retainer unit 50, as shown in FIGS.
Fastener projection 5 inserted into a mounting hole 52 provided in
And a horizontal shaft 5 provided on the base 55.
7 and an L-shaped retainer 60 rotatable about a horizontal shaft 57. This L-shaped retainer 60 and base 55
Are all injection-molded products of synthetic resin.

The L-shaped retainer 60 is shown in FIG.
5 has a first portion 61 projecting upward and a second portion 62 projecting horizontally toward the bumper 10.
In the free state, the L-shaped retainer 60 is supported by a stopper portion (not shown) or the like so that the second portion 62 pivots and descends to the above horizontal state by its own weight and stops in a horizontal posture. Has been done.

Therefore, the first portion 61 is erected before the bumper 10 is temporarily attached to the body-side member 28, but when the bumper 10 is pressed in the body direction, the first portion 61 is retained by the locking projection 40 (or 41). When the first portion 61 is pushed toward the body side, the first portion 61 rotates about the horizontal shaft 57 by about 90 ° and falls toward the body side. On the other hand, the second portion 62 is substantially horizontal before the bumper 10 is temporarily attached, but when the first portion 61 falls down in the above direction when the bumper 10 is pressed in the body direction, By rotating the second portion 62 in the upright direction, the second portion 62 is engaged with the back surface 46a of the downward convex portion 46 from below. Then, the first portion 61 is provided with a convex portion 65 having a shape that can be fitted into the above-mentioned concave portion 47.

As shown in FIG. 7 as a representative of the one locking projection 41, the width L1 of the locking projection 41 is preferably 1.5 times or more the width L2 of the L-shaped retainer 60. By doing so, the width L1 of the locking projection 41 and the width L2 of the retainer 60 are
And the assembling error of the height H of the retainer 60 can be absorbed.

Next, the bumper 10 is attached to the body-side member 2
The procedure and the like for assembling to No. 8 will be described. In order to assemble the bumper 10 to the body-side member 28, the bumper 1 is arranged so that the locking protrusions 40 and 41 face each other in front of the retainer unit 50 previously attached to the body-side member 28.
With the positioning of 0 (FIG. 5), the robot or the worker horizontally pushes the bumper 10 toward the member 28 on the body side.

By doing so, the locking projections 40, 41
The downward convex portion 46 pushes the first portion 61 of the retainer 60 toward the body side, so that the retainer 60 is moved to the 9 side as shown in FIG.
The first portion 61 tilts toward the body by rotating about 0 °, and the second portion 62 rises. Therefore, the locking projections 40 and 41 are mounted on the retainer 60, and the second portion 62 is engaged with the back surface 46a side of the downward convex portion 46 from below.

In this temporarily attached state, the bumper side 12 and the mounting portions 25 and 30 are in contact with the body side member, so that the bumper 10 is prevented from inclining by its own weight, and the bumper 10 is held at a predetermined height of the body. To be done.

Further, in the above-mentioned temporary attachment state, the concave portion 47 and the convex portion 65 are fitted to each other as shown in FIG. 7, so that the bumper 10 can be accurately positioned in the vehicle width direction (arrow W direction). You can Therefore, when the mounting parts 25 and 30 are fully fastened by the fixing parts 27 and 32 after the temporary mounting, the positions of the holes 26 and 31 are set to the body side member 28.
Since the screw holes can be accurately aligned with the screw holes, the fastening operation with the fixing parts 27 and 32 can be performed quickly and easily.

When the position of the bumper 10 is displaced in the vehicle width direction during the above-mentioned temporary attachment, the concave portion 47 and the convex portion 65 are not fitted to each other. Therefore, the bumper 10 should be moved in the direction of the arrow W during the temporary attachment. Therefore, the concave portion 47 and the convex portion 65 may be fitted together. The positional relationship between the concave portion 47 and the convex portion 65 may be reversed.

After the bumper 10 is temporarily attached as described above, the mounting portions 25 and 30 are fixed to the fixing parts 27 and 3, respectively.
It is fixed to the member 28 on the body side by 2 and the terminal fixing portion 20 of the bumper side 12 is fixed to the body side by the fixing component 21.

To remove the bumper 10 from the body, the fixing parts 21, 27, 32 are removed, and then the bumper 10 is strongly pulled in the direction away from the body-side member 28 to invert the L-shaped retainer 60 by 90 °. By disengaging the retainer 60 from the locking projections 40 and 41, the bumper 10 can be easily removed without damaging it. Therefore, the bumper 10 can be easily replaced, and the bumper 10 can be reused.

According to the bumper mounting structure using the retainer 60 as described above, the terminal fixing portion 20, the upper end mounting portion 25 and the intermediate mounting portion 30 of the bumper 10 are fixed to the fixing parts 21, 27 ,.
Rigid fixing by 32 (main fastening). On the other hand, the left and right portions of the intermediate portion of the bumper main body portion 11 near the center serve as auxiliary fastening by engagement between the retainer 60 and the locking projections 40 and 41. In this auxiliary fastening portion, the movement of the retainer 60 in the front-rear direction is restricted, and the retainer 60 can move to some extent in a direction other than the front-rear direction.

When this bumper mounting structure is adopted, the apparent deformation of the bumper 10 is extremely reduced when the temperature changes such that the bumper 10 thermally expands and contracts, and a step is formed between the bumper side 12 and the body. It has become possible to avoid such problems as the occurrence of heat generation, thermal deformation of the central portion of the bumper body 11 in the front-rear direction, and large exposure of the edge portion of the bumper side 12. For this reason, even when the terminal fixing portion 20 of the bumper side 12 is rigidly fixed to the body in order to achieve the flash surface of the body, deterioration of the appearance due to thermal expansion can be suppressed to a level that does not pose a practical problem. It has become possible to improve the appearance quality at high temperatures.

Further, according to this embodiment, at the auxiliary fastening portion formed by the retainer 60 and the locking projections 40, 41, the locking projections 40, 41 integrally formed on the back side of the bumper 10 are pushed into the retainer 60 from the front. Since it can be connected to the retainer 60 by the above, it is not necessary to open a bolt insertion hole or the like on the surface of the bumper 10, which is preferable in appearance. In addition, by providing allowances for the widths of the locking projections 40 and 41 and the width of the retainer 60, it is possible to absorb dimensional errors and positional deviations due to manufacturing variations.

Since no metal parts such as a retainer are attached to the bumper 10, when the bumper 10 is removed from the body in order to recycle the bumper 10,
The synthetic resin used for the bumper 10 can be directly processed as a recycled material, and a troublesome post-processing such as removal of metal parts is unnecessary.

The exterior material mounting structure of the present invention can be used for mounting a front bumper, and can also be used for exterior materials other than bumpers, such as resin aero parts such as spoilers and body-related parts such as grilles or side protectors. Can be applied.

[0037]

As described above, according to the present invention, it is possible to easily temporarily attach the resinous exterior material to the body, make the deformation of the exterior material due to thermal expansion inconspicuous, and improve the appearance quality. Can be improved.

[Brief description of drawings]

FIG. 1 is a plan view of a part of a bumper and a body side member according to an embodiment of the present invention.

FIG. 2 is a front view of the bumper shown in FIG.

FIG. 3 is a sectional view taken along the line III-III in FIG.

FIG. 4 is a perspective view showing a part of the bumper shown in FIG. 1 and a retainer.

5 is a cross-sectional view showing a state before the bumper shown in FIG. 1 is attached to a member on the body side.

6 is a cross-sectional view showing a state in which the bumper shown in FIG. 1 is temporarily attached to a member on the body side.

FIG. 7 is a cross-sectional view showing a fitting portion between the locking projection and the retainer of the bumper shown in FIG.

FIG. 8 is a plan view schematically showing a conventional bumper mounting structure.

FIG. 9 is a plan view schematically showing another example of the conventional bumper mounting structure.

FIG. 10 is a plan view schematically showing still another example of the conventional bumper mounting structure.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 ... Bumper (resin exterior material) 11 ... Bumper main body part 28 ... Body side member 40, 41 ... Locking protrusion 45 ... Horizontal part 46 ... Downward convex part 55 ... Base part 57 ... Horizontal shaft 60 ... L-shaped retainer 61 ... First part 62 ... Second part

Claims (1)

[Claims] 1. A resin exterior material having a body portion extending along the body, fixing means for fixing both longitudinal end portions and longitudinal intermediate portion of the exterior material to the body side, and the exterior surface on the back side of the exterior material. A locking projection having a horizontal portion integrally formed with the main body portion between the longitudinal center of the material and the intermediate portion and projecting toward the body, and a downward convex portion projecting downward from the tip end side of the horizontal portion; The base member attached to the body-side member is rotatably provided around a horizontal axis and is in an upright state before the exterior member is temporarily attached to the body. It has a first portion that rotates around the horizontal axis and falls down to the body side by being pushed by the stop projection, and has fallen before temporarily attaching the exterior material to the body, but pushes the exterior material toward the body. On when An L-shaped retainer having a second portion that engages from below with the back surface side of the downward convex portion of the locking projection by rotating in the upright direction as the first portion rotates. The mounting structure for the resin exterior material.