JPH0540263Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to the installation of a heat shield covering an exhaust pipe extending from an internal combustion engine, particularly an automobile engine.

Conventional Technology Conventionally, when attaching a heat shield plate to the exhaust pipe of an automobile, as shown in FIG. , nuts 4', etc., were generally used to tighten and fix. However, with this method, the heat shield plate and the exhaust pipe, which transmit engine vibrations and act as a vibration source, are fixed together, so the heat shield plate becomes a resonator in a certain frequency range and becomes a solid body. This caused vibrations and caused unpleasant sounds such as chattering noises.

A conventional proposal to solve this problem is to weld a plate 5 (see FIG. 3b) with a certain thickness to the bolt attachment area of the heat shield plate 3, as shown in FIG. Heat-resistant elastic body 6,
6', and attach the heat shield plate 3 to the bracket 2 via the heat-resistant elastic bodies 6, 6' with bolts 4 and nuts 4'.
It was tightened using.

Problems to be solved by the invention Although the conventional proposals described above have been effective in avoiding the resonance phenomenon, the use of the thick metal plate 5 adds unnecessary weight. Moreover, the cost of materials and welding labor was unnecessarily high.

Means for Solving the Problems The present invention aims to solve the above-mentioned problems. That is, the present invention provides a mounting structure for attaching a heat shield plate covering the exhaust pipe to a bracket of an engine exhaust pipe, in which the bolt attachment portion of the heat shield plate is formed into a round hole shape with a short sleeve portion, and the sleeve An exhaust pipe heat shield plate, characterized in that a heat-resistant elastic body with a flange is fitted into a round hole having a portion, and a mounting bolt is inserted into the center hole of the heat-resistant elastic body to be attached to the bracket. in the mounting structure.

Function According to the above structure, the short sleeve portion formed by processing the heat shield plate performs substantially the same function as the conventionally proposed plate, and effectively provides vibration-proof support for the heat shield plate via the heat-resistant elastic body. can be achieved.

Embodiment FIG. 1 shows a first embodiment of the present invention. As is clear at first glance when this figure is compared with FIG. 3a showing the conventional example, in this embodiment the thick plate 5
Instead, the round holes at the bolt attachment portions of the heat shield plate 3 are formed to form short sleeve portions 3' having a relatively large diameter. In the illustrated example, the diameter of the sleeve portion 3' is approximately twice the diameter of the bolt 4, and the height substantially corresponds to the thickness of the plate 5 described above.

First, the heat-resistant elastic body 6 is fitted into the round hole of the heat shield plate 3 formed in this way. The heat-resistant elastic body 6 is preferably made of metal fiber and has a central hole through which the bolt 4 is inserted, a collar portion that contacts the bracket 2, and a portion that extends inside the sleeve portion 3'. Next, a washer-like heat-resistant elastic body 6' made of the same material is inserted into the bolt 4, and the bolt 4 is brought out of the bolt hole of the bracket 2 through the center hole and tightened with a nut 4'.

The second embodiment of the present invention shown in FIG. 2 differs from the embodiment shown in FIG. In this configuration, the shape of the heat shield plate does not affect the metal fibers of the elastic body.

Effects of the invention According to the above-described configuration, the heat shield plate 3 itself can have the same function without using the conventional plate 5. This reduces weight and costs (parts costs, welding costs).

In addition, since it can be used without a seat surface for attaching the plate like in the past, when a design change is required (when elastic support is required), all you need to do is review the shape of the heat shield's mounting hole. This has the advantage that there is little impact on preparation costs, etc. (In the case of the conventional structure, the shape of the entire mounting part of the heat shield plate had to be reconsidered, which significantly increased preparation costs, and also affected models that did not require countermeasures, such as those with different engines. )

[Brief explanation of the drawing]

Fig. 1 is a sectional view of the first embodiment of the present invention;
3A is a sectional view of a conventional example, FIG. 3B is a perspective view of a plate used in this conventional example, and FIG. 4 is a perspective view of an even earlier conventional example. 1...Exhaust pipe, 2...Bracket, 3...Heat shield plate, 3'...Sleeve part, 3''...Flange part, 4...Bolt, 4'...Nut, 5...Plate, 6, 6'...Heat-resistant elastic body.

Claims (1)

[Scope of utility model registration request] In the mounting structure for attaching a heat shield plate covering the exhaust pipe to a bracket of an engine exhaust pipe, the bolt attachment part of the heat shield plate is formed into the shape of a round hole with a short sleeve part, and a round hole with the sleeve part is formed. Fit a heat-resistant elastic body with a collar into the hole,
A mounting bolt is inserted into the center hole of the heat-resistant elastic body to attach it to the bracket.
Installation structure of exhaust pipe heat shield.