JPS6249186B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for fixing multilayer ceramic members.

Conventionally, for example, when fixing a multilayer ceramic crown to a metal piston, bolts have been the main method of fixing, but this method exposes the bolts to combustion gas, so there is a problem that there is a limit to the operating temperature. Ta. In addition, it was necessary to drill bolt holes in the ceramic, making the structure complicated.

The present invention aims to solve such problems and is a method of fixing a multilayer ceramic member to the high-temperature side surface of a metal body whose one end face is exposed to high heat. A disk-shaped groove is formed on the high-heat side end surface of the metal coupling member, and a ceramic disk is fitted into the disk-shaped groove of the metal coupling member by shrink fit or cold fit. The high-temperature side end of this joining metal member is fitted into the groove formed on the other end surface of the ceramic cover plate with one end surface serving as a contact surface, and then shrink-fitted or cooled. The integrated joining metal member, ceramic disc, and ceramic cover plate are inserted and fixed by fitting, and then the integrated joining metal member, ceramic disc, and ceramic cover plate are attached to the high-heat side end surface of the metal body through the thread grooves on the outer peripheral surface of the joining metal member. This objective is achieved by providing a method for fixing a multi-layer ceramic member that is screwed into a formed screw hole and fixed, thereby eliminating the need for bolts and reducing combustion. The gas temperature can be kept high, and there is no need to drill bolt holes in ceramics, so the structure can be simple.

An embodiment of the present invention will be described in detail below based on the drawings.

FIG. 1 shows an example in which the method of the present invention is applied to a piston head. In the figure, reference numeral 1 denotes a cylindrical piston body made of a suitable metal, and a screw hole 3 is formed at two ends of the inner peripheral surface on the high-temperature side. 4 is a threaded groove 5 on the outer peripheral surface that is screwed into the threaded hole 3 of the piston body 1;
It is a joining metal member having a disc-shaped groove 6 formed on its two end faces on the high-temperature side. 7 is a ceramic disk inserted and fixed in the disk-shaped groove 6;
is a ceramic cover plate that covers the two ends of the high-heat side of the metal joining member 4 into which the ceramic disk 7 is inserted and fixed; A groove 9 is formed which fits into the two ends of the member 4 on the high temperature side. Further, its size is set to match the outer diameter of the piston body 1.

Next, the assembly procedure will be described. First, the ceramic disc 7 is fitted into the disc-shaped groove 6 of the metal member 4 for coupling, and is inserted and fixed by shrink fit or cold fit. Next, the high temperature side 2 of this metal joining member 4 is
The end portion is fitted into the groove 9 of the ceramic cover plate 8 and inserted and fixed by shrink fit or cold fit. Then, these integrated metal joining member 4, ceramic disc 7, and ceramic cover plate 8 are screwed into the screw hole 3 of the metal main body 1 through the thread groove 5 on the outer peripheral surface of the joining metal member 4. Insert and fix. Further, in order to prevent the coupling metal member 4 from rotating, a corner portion between the lower end surface of the coupling metal member 4 and the inner circumferential surface of the piston body 1 is welded. This completes the assembly.

FIG. 2 shows an example in which the method of the present invention is applied to an exhaust valve. That is, as is clear from the figure, the piston body 1 in the previous embodiment was replaced with a metal exhaust valve body 10, and the other configurations are the same as in the previous embodiment, so the same numbers are given. . With such a configuration, the multilayer ceramic members 7 and 8 can be fixed to the two high-heat side surfaces of the exhaust valve main body 10 by assembling in the same procedure as in the previous embodiment.

As described above, according to the present invention, there is no need to use bolts, so the temperature of the combustion gas can be kept high, and there is no need to drill bolt holes in ceramics, so the structure can be simplified.

[Brief explanation of the drawing]

The drawings show an embodiment of the present invention, in which FIG. 1 is a longitudinal sectional view of a piston head, and FIG. 2 is a longitudinal sectional view of an exhaust valve. 1...Piston body, 2...High temperature side, 3...Threaded hole, 4...Metal member for coupling, 5...Thread groove,
6...Disc-shaped concave groove, 7...Ceramics disc, 8
...Ceramics cover plate, 9...Concave groove, 10...
...Exhaust valve body.

Claims (1)

[Claims] 1 A method of fixing a multilayer ceramic member to the high-heat side of a metal body whose one end face is exposed to high heat, in which a disc-shaped ceramic member is fixed to the high-heat side end of the joining metal member having a thread groove formed on the outer peripheral surface. A groove is formed, and a ceramic disc is fitted into the disc-shaped groove of the metal joining member, inserted and fixed by shrink fit or cold fit, and the high-temperature side of the metal joining member is inserted and fixed. The end portion is fitted into a concave groove formed on the other end surface of a ceramic cover plate with one end surface serving as a contact surface, and is inserted and fixed by shrink fit or cold fit, and these are integrated together. The metal member for connection, the ceramic disk, and the ceramic cover plate are screwed into a screw hole formed on the high-heat side end surface of the metal body through the thread groove on the outer peripheral surface of the metal member for connection and fixed. A method for fixing multilayer ceramic members.