JPS585567A - Method for making a gasket by molding - Google Patents

Abstract

PURPOSE:To manufacture gaskets, which provide sure sealing for high temperature exhaust gas, by using a wire mesh sheet in which treads of asbestos or carbon are woven in. CONSTITUTION:A wire mesh sheet 1 as material made flat by knitting thin metal wires 1a together with threads of asbestos or carbon, 1b, is formed into a spiral having a specific size, being coated at its exterior surface with graphite sheet 2, that is then compressed into such a configuration as making contact with the internal surface of a spherical flange at the end of tail tube of the exhaust manifold to form a gasket 3. The gasket 3 thus formed provides a high air-tightness and high resistance to air permeation because thin metal wires 1a are well entangled with the woven threads of asbestos or carbon 1b, so that sufficient sealing performance and high heat resistance are obtained to ensure that the exhaust gas at high temperature is sealed certainly.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method of forming a gasket disposed between an exhaust manifold and a tail pipe, and its purpose is to reliably seal high-temperature exhaust gas.

Conventionally, this type of gasket and
As shown in Publication No. 9, a wire mesh is placed on a sheet of refractory material such as graphite or mica, and both ends are wrapped with only the sheet of refractory material, and the outer surface of the annular exhaust manifold end and Although the VC was compression molded into a shape that would come into contact with the inner surface of the spherical flange at the end of the tail pipe, a small gap was created between the strands of the wire mesh sheath I and the refractory material sheet, resulting in insufficient sealing performance. It had the disadvantage of being.

The present invention eliminates the drawbacks of the conventional IT wire mesh sheet by knitting it with IC asbestos yarn or carbon-based yarn.1. It is something that

Next, the method of the present invention will be described in detail with reference to an embodiment shown in the accompanying drawings. One thin metal wire 1o and asbestos thread or carbon-based 1b are knitted together into a flattened wire mesh sheet, which is spirally shaped into a predetermined size.
Cover the outer surface with graphite sheet 2]-1 Compress the outer surface into a shape such that it comes into contact with the inner surface of the spherical flange at the end of the tail tube 1-7
to form the gasket 3.

The gasket made by the method of the present invention has high airtightness because fine metal wires and asbestos threads or carbon-based materials are well entwined, and has sufficient sealing performance because of its high ventilation resistance, and has high heat resistance so that high-temperature exhaust gas is reliably kept out. can be sealed.

[Brief explanation of drawings]

Fig. 1 is a partially enlarged plan view of a wire mesh sheet used in the present invention, Fig. 2 is a perspective view before compression molding, and Fig. 5 is a front sectional view of an embodiment of a gasket formed by the method of the present invention. be. 10...Thin metal wire 1b...Asbestos thread 1
...Wire mesh sheet 2...Graphite sheet 3...Gasket. Patent Applicant: Chuo Spring Co., Ltd., District 1, Figure 2, No. 3, 418-

Claims (1)

[Claims] A wire mesh sheet made by knitting thin metal wires and asbestos threads or carbon fibers together is made into a spiral shape, the outer surface of which is covered with a graphite sheet, and then the outer surface is covered with a graphite sheet. A method of forming a gasket by compression molding it into a predetermined shape.