JPS6247095B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for forming an exhaust seal body for sealing high-temperature exhaust gas, which is used, for example, at the connection between an exhaust manifold pipe and an exhaust pipe of an engine. The purpose of this is to improve sliding performance with the exhaust manifold pipe and the exhaust pipe and to prevent damage to the exhaust manifold pipe and the exhaust pipe even if the inner sealing material is scraped off by friction.

As shown in Fig. 1, a conventional exhaust seal body consists of a flat cylindrical wire mesh 1 made of knitted heat-resistant stainless steel wire, and a seal plate 2 made of flexible graphite (see "Nica Film FL200" manufactured by Nippon Carbon Co., Ltd.) or the like. is brought into contact with one surface of the exhaust seal body 3 and attached integrally with staples so as not to shift, and then wound as shown in Fig. 2 and further compressed in the axial direction with a predetermined pressure to form the exhaust seal body 3 as shown in Fig. 3. When in use, the exhaust seal body 3 is fitted to the outer surface of the end of the exhaust manifold pipe 4 as shown in FIG. The flange 6 at the end of the manifold pipe and the flange 7 at the end of the exhaust pipe are tightened with bolts 8.However, if the seal plate 2 on the inner and outer surfaces of the exhaust seal body 3 is scraped off due to vibration during use, the wire mesh part will become attached to the exhaust manifold. Although it comes into direct contact with the outer surface of the pipe 3 and the inner surface of the exhaust pipe 5, since the wire mesh is made of heat-resistant stainless steel wire, it has poor abrasion, which has the disadvantage of damaging the outer surface of the exhaust manifold pipe 3 and the inner surface of the exhaust pipe 5.

In the present invention, a seal plate is inserted into a cylindrical wire mesh made of knitted copper wire at one end and heat-resistant stainless steel wire at the middle, and pressed flat to form a wire mesh-covered seal plate, and then the one end made of copper wire is In order to eliminate the drawbacks of the conventional exhaust seal body, the metal mesh-covered seal plate is wound inward in a ring shape, and the inner part made of the copper wire is compression-molded into a shape that matches the lapel-shaped end of the exhaust pipe. This is what I did.

Next, the method of the present invention will be explained with reference to the attached FIGS. 5 to 8. Reference numeral 10 is a first embodiment of a cylindrical wire mesh, in which both end portions 10a and 10c are knitted with copper wire, and the intermediate portion 10b is knitted with heat-resistant stainless steel wire.

As shown in FIG. 6, after inserting a sealing plate 11 made of flexible graphite or the like into a cylindrical wire mesh 10, it is pressed and flattened to form a wire mesh-covered sealing plate, and then one end portion 10a or 10b of the copper wire is Wrap this wire mesh coated sealing plate in a ring shape on the inside,
The exhaust seal 12 is formed by compressing the inner portion of the copper wire into a shape that matches the flap-shaped end of the exhaust pipe. 13 is a second embodiment of a cylindrical wire mesh, with one end 1
3a is made of copper wire, and the other part 13b is knitted with heat-resistant stainless steel wire, and an exhaust seal is formed in the same manner as in the first embodiment so that one end 13a of the copper wire is on the inside.

According to the present invention, a sealing plate is inserted into a cylindrical wire mesh made of knitted copper wire at one end and heat-resistant stainless steel wire at the middle, and pressed flat to form a wire mesh-covered sealing plate, and then one end made of copper wire. Since the exhaust seal body is made by winding the wire mesh-covered seal plate in a ring shape with the part facing inward, and compression molding the inner part made of the copper wire into a shape that matches the lapel-shaped end of the exhaust pipe, Even if the seal plate 11 in contact with the outer surface of the exhaust manifold pipe 4 is scraped off due to vibration during use, since the copper wire is in contact with the outer surface of the exhaust manifold pipe 4, sliding properties are good, and therefore the exhaust manifold The cylindrical wire mesh 1 can be used without damaging the outer surface of the pipe 4.
Most of 0 and 13 are made of heat-resistant stainless steel wire, so they have sufficient heat resistance.

Note that instead of the copper wire, a stainless steel wire plated with copper or another metal wire plated with copper may be used.

[Brief explanation of the drawing]

Figures 1 to 3 are sequential views showing the conventional molding method, Figure 4 is a partially cutaway front view of the exhaust seal body in use, and Figure 5 is a cylindrical shape of the first embodiment used in the method of the present invention. FIG. 6 is a plan view of a wire mesh, FIG. 6 is a perspective view of an embodiment for forming a wire mesh-coated seal plate based on the method of the present invention, and FIG. 7 is a perspective view of an embodiment of an exhaust seal body formed by the method of the present invention. FIG. 8 is a plan view of the cylindrical wire mesh of the second embodiment used in the method of the present invention. 10... Cylindrical wire mesh, 10a, 10c... Both ends, 10b... Middle part, 11... Seal plate, 12
... Exhaust seal body, 13 ... Cylindrical wire mesh, 13a ...
...one end part, 13b...other part.

Claims (1)

[Claims] 1. A seal plate is inserted into a cylindrical wire mesh knitted with copper wire at one end and heat-resistant stainless steel wire at the middle, and pressed flat to form a wire mesh-covered seal plate.
Next, the metal mesh-coated seal plate is wound in a ring shape with one end made of copper wire facing inward, and the inner part made of copper wire is compression molded into a shape that matches the lapel-shaped end of the exhaust pipe. molding method.