JPH0529168Y2 - - Google Patents

Description

[Detailed explanation of the idea] Industrial applications Reinforcement of automobile resin bumpers, etc.

Conventional technology For large resin parts such as automobile resin pumps that do not have sufficient strength and rigidity on their own and cannot maintain their shape, reinforcing materials such as sheet metal are attached to the back of the parts as shown in Figure 3. ing. As methods for attaching the reinforcing material, there are, for example, the following methods (1) and (2).

(1) As shown in Figure 4, boss 0 is attached to resin part 01.
2 is provided, and a reinforcing material 03 is fixed to the boss 02 with a screw 04.

(2) As shown in FIG. 5, a thin plate-like protrusion 06 is provided on the resin part 05, and a reinforcing member 07 having a slit corresponding to the protrusion 06 is fixed with a clip 08 as shown in FIG.

Problems to be solved by the invention There is a considerable difference in coefficient of thermal expansion between resin parts such as bumpers and sheet metal reinforcements. Therefore, the prior art
As shown in (1), when the resin part 01 and the reinforcing material 03 are fixed with the screw 04, the resin part 0
1 transforms. According to the prior art (2), the resin component 05 and the reinforcing material 07 are not firmly fixed but can slide. However, there are problems with retention of the reinforcing material, cost of clips, workability, etc.

Means for solving the problem: A boss is formed integrally with the resin part and includes a large diameter part and a small diameter part, and is equipped with a screw mounting hole. A hole is provided, the height of the small diameter part is made slightly larger than the thickness of the reinforcing material, the hole of the reinforcing material is fitted into the small diameter part of the boss, a screw is screwed into the mounting hole, and the reinforcing material is attached to the reinforcing material. is movably held within a gap formed between the large diameter portion of the boss and the head of the screw.

Function The screw is firmly fastened to the small diameter portion of the boss, but since the height of the small diameter portion of the boss is greater than the thickness of the reinforcing material, the reinforcing material is not fixed to the boss and can slide.

Embodiment In FIGS. 1 and 2, 1 is a resin part, 2 is a large diameter part of the boss provided on the resin part 1, 3 is a small diameter part of the boss formed following the large diameter part 2, and 4 is a small diameter part of the boss. Screw mounting holes provided in the center of the boss small diameter part 3 and the boss large diameter part 2, 5 is a reinforcing material made of sheet metal or the like;
6 is a hole in the reinforcing member 5, and 7 is a screw for tightening.

In such a structure, the hole 6 of the reinforcing material 5 is smaller than the boss large diameter part 2 and slightly larger than the boss small diameter part 3, and the height of the boss small diameter part 3 is slightly larger than the plate thickness of the reinforcing material 5. Therefore, when tightening the screw 7,
The hole 6 of the reinforcing material 5, the boss large diameter part 2, the boss small diameter part 3,
A gap is formed between the reinforcing member 5 and the screw 7, as shown in FIG. 1, and the reinforcing member 5 is movable relative to the resin part 1 by the gap.

Effects of the invention (1) Since the reinforcing material is attached to the resin part with screws, the attachment is reliable and the cost required for attaching the reinforcing material can be reduced.

(2) Since the reinforcing material is movably attached to the resin part, the resin part does not deform even if a considerable temperature change occurs.

[Brief explanation of the drawing]

FIG. 1 is a sectional view of an embodiment of the reinforcing material attachment structure for large resin parts of the present invention, and corresponds to the AA section in FIG. 3. FIG. 2 is an exploded view of FIG. 1, and FIG. 3 is a perspective view of the bumper face. Figures 4 and 5
The figure is a sectional view of a conventional structure, and corresponds to the AA cross section in FIG. 6 is a perspective view of the clip of FIG. 5; FIG. 1...Resin part, 2...Boss large diameter part, 3...Boss small diameter part, 4...Screw mounting hole, 5...Reinforcement material, 6...Reinforcement material hole, 7...Screw.

Claims (1)

[Scope of utility model registration request] A boss is formed integrally with the resin part and includes a large diameter part and a small diameter part, and is provided with a screw mounting hole, and a hole smaller than the large diameter part and slightly larger than the small diameter part is provided in the sheet metal reinforcing material. Make the height slightly larger than the thickness of the reinforcing material, fit the hole in the reinforcing material into the small diameter part of the boss, screw the screw into the mounting hole, and connect the reinforcing material to the large diameter part of the boss. A structure for attaching a reinforcing material to a large resin part, characterized in that it is movably held within a gap formed between the head and the head of a screw.