Spark plug manufacturing method, spark plug manufacturing equipment and assembly inspection method

Japanese Patent JP6348185

B2

An object of the invention is to shorten the production time of spark plugs. A method of producing a spark plug comprises (a) a step of combining a metallic shell and an insulator such that the metallic shell covers the outer circumferential surface of a forward end side of the insulator so as to obtain an assembly; (b) a step of inserting a portion of the assembly on its forward end side into a pressure container through an opening of the pressure container; (c) a step of bringing an insulating member into contact with the outer circumferential surface of a base side portion of the insulator over the entire circumference thereof in a state in which the axial line of the assembly and the axial line of the opening coincide with each other, and pressing the assembly so as to close the opening by the assembly; and (d) a step of pressurizing the interior of the pressure container and applying a predetermined voltage between the terminal electrode and the metallic shell, wherein the step (b) includes a step of inserting the portion of the assembly on the forward end side into the pressure container such that a gap formed between the outer circumferential surface of the insulator and the inner circumferential surface of the metallic shell on the forward end side of the assembly is disposed in the pressure container.

Okuda Masashi
Toshiyuki Otsuki
Kanako Nishiyama

JP2016555858A

June 27, 2018

March 17, 2016

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Nippon Special Ceramics Co., Ltd.

H01T21/02; H01T13/60

JP2013089428A
JP2014130805A

US4570124

Hiroki Nakajima

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