JPH0212260Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a band-type clamp used in the exhaust system of an internal combustion engine when attaching a heat shield plate to the exhaust pipe of a vehicle body or ground grass.

Most of the heat shield plates mentioned above are made of surface-treated thin steel plates due to heat and corrosion resistance requirements, so they are shielded from noise emitted from the exhaust pipe caused by the engine's explosion process and from the exhaust pipe. Due to the temperature difference (difference in thermal expansion) with the heat plate, the sliding friction noise generated between the metal plate clamp for attaching the heat shield plate and the exhaust pipe is propagated to the heat shield plate, producing a loud noise.

In order to reduce the above-mentioned propagation sound and sliding sound,
A thin metal plate such as copper or aluminum with a low coefficient of friction, or a mesh plate, etc., is interposed between the heat shield mounting clamp and the exhaust pipe as a soundproofing cushioning material (Reference Publication No. 56-24272). .

However, due to the material of the exhaust pipe itself, the former thin plate is not perfect even if only the clamp is used, and the latter mesh plate has a problem in positioning and fixing it to the band clamp body so that it does not shift, and it often shifts. Sometimes it becomes useless.

The present invention relates to an improved clamp in view of this problem, and as shown in the embodiment, a band-shaped clamp body is formed from a net woven with thin metal wires, and both ends of the clamp body are formed by press-forming in advance. This is made by overlapping and welding shaped fasteners, and forming the whole into an arc shape as required.

With the above configuration, all the surfaces that come into contact with the exhaust pipe, that is, the surfaces that cause slippage due to differences in thermal expansion, are mesh surfaces, so the contact surfaces are small and have a cushioning function, and the sliding noise is small. In addition, the propagation sound volume is also reduced.

The clamp body 1 can be made of any material, such as a single-layer mesh plate, a cylindrical lattice-knitted stainless steel wire plate as shown in Fig. 4, or a double cylindrical mesh plate and four layers. . The fastening fitting 2 is formed by press-forming a steel plate or the like into a substantially L shape, and the surface 2 ₁ to be overlapped and welded to the end of the main body 1 is arc-shaped, and the surface to be mated with the mating fastening fitting is flat. The clamp body 1 is press-molded into an arc shape as required.

To use this clamp, wrap the pair of clamp bodies 1 around the exhaust pipe P facing each other, and connect the radially protruding mounting surfaces of the arcuate heat shield plates 3a and 3b to the radially protruding surface of the clamping fitting 2. superimposed on,
Attach the clamp to the exhaust pipe P and the heat shield plates 3a and 3b to the clamp by integrally tightening bolts and nuts.

The heat shield may be on either the vehicle body side or the ground side.

This clamp attaches the exhaust pipe P to the vehicle body with hanger 4.
Can also be used when hanging. In this case, the notched circular clamp shown in FIG. 3 may be used.

As described above, since all surfaces of the clamp in contact with the exhaust pipe are mesh surfaces, the sliding friction sound and propagation volume caused by the difference in thermal expansion are reduced. It is also easy to manufacture and suitable for mass production. The work of attaching the heat shield plate can be easily and quickly done without requiring the hassle of inserting cushioning material as in the past.

[Brief explanation of drawings]

Figure 1 is an exploded perspective view of the clamp of the present invention, Figure 2 is a perspective view of a half-split clamp with a heat shield attached, Figure 3 is a cross-sectional view of another example of the clamp, and Figure 3 is a cross-sectional view of another example of the clamp. Figure 4 is a perspective view of the mesh plate. 1... Steel plate clamp body, 2... Tightening metal fittings, 3
a, 3b...heat shield plate, P...exhaust pipe.

Claims (1)

[Scope of utility model registration request] The clamp body that is wrapped around the exhaust pipe is formed into a band shape using a net woven from metal wire, and the clamping fittings are press-formed into a roughly L shape and overlapped and welded to both ends of the clamp body to create an exhaust system shield for an internal combustion engine. Clamp for mounting hot plate.