JPH0358890U

JPH0358890U -

Info

Publication number: JPH0358890U
Application number: JP12073089U
Authority: JP
Priority date: 1989-10-16
Filing date: 1989-10-16
Publication date: 1991-06-10

Description

[Brief explanation of the drawing]

第１図は本考案に係る点火プラグの一実施例を
示す構成図、第２図は従来の点火プラグの一例を
示す構成図である。１……シエル、２……磁器、３……中軸、４，
５……空隙、６……口輪、１０……シール金具、
３１……ターミナル。 FIG. 1 is a block diagram showing an embodiment of a spark plug according to the present invention, and FIG. 2 is a block diagram showing an example of a conventional spark plug. 1...Ciel, 2...Porcelain, 3...Center shaft, 4,
5...Gap, 6...Muzzle, 10...Seal fitting,
31...Terminal.

Claims

[Scope of claim for utility model registration] The inner diameter gradually decreases toward the bottom3.
A piece of porcelain in which a through hole is formed and has a thick part on the outside of the central part is formed into a cylindrical shape and has a tapered part on the inner surface that engages with a tapered part of the thick part of the porcelain. The thick portion is fitted into the shell, and the center shaft coupled to the terminal made of a metal material is inserted into the lower hole of the porcelain, and the terminal is inserted into the middle hole and upper hole of the porcelain, respectively. A spark plug having a combined structure includes a seal fitting made of a metal material formed in a shape to seal a space between an upper end between the shell and the porcelain, the upper end being closed by the terminal. After filling the gap in the intermediate hole of the porcelain with inorganic powder, the terminal is joined to the porcelain side by hard brazing, and the gap between the shell and the porcelain, which is covered by the sealing fitting, is filled with inorganic powder. After that, the seal fitting is joined to the porcelain side by hard brazing, and the other end of the seal fitting is joined to the shell by welding.