JPS6370690U

JPS6370690U -

Info

Publication number: JPS6370690U
Application number: JP16558686U
Authority: JP
Priority date: 1986-10-27
Filing date: 1986-10-27
Publication date: 1988-05-12

Description

[Brief explanation of the drawing]

第１図乃至第３図は本考案の一実施例を示す圧
力センサー内蔵型スパークプラグであり、第１図
はスパークプラグの要部断面図、第２図は第１図
の平面図、第３図は第１図の要部拡大断面図、第
４図は本考案の他の実施例を示す要部拡大断面図
、第５図は本考案の更に他の実施例を示す圧力セ
ンサー内蔵型スパークプラグの要部断面図、第６
図は従来の圧力センサー内蔵型スパークプラグの
一部縦断面図である。１……絶縁体、２……中心電極、３……外側電
極、４……主体金具、４ａ……胴部、４ｂ……座
面、４ｃ……薄肉部、４ｄ，４ｌ……縦孔、５，
２５，３５……圧力センサー、９，２９……受圧
面、１０……ガスケツト、２０……エンジンヘツ
ド。 1 to 3 show a spark plug with a built-in pressure sensor showing an embodiment of the present invention, FIG. 1 is a sectional view of the main parts of the spark plug, FIG. 2 is a plan view of FIG. 1, and FIG. The figure is an enlarged sectional view of the main part of Fig. 1, Fig. 4 is an enlarged sectional view of the main part showing another embodiment of the invention, and Fig. 5 is a spark with a built-in pressure sensor showing still another embodiment of the invention. Cross-sectional view of the main part of the plug, No. 6
The figure is a partial vertical sectional view of a conventional spark plug with a built-in pressure sensor. 1... Insulator, 2... Center electrode, 3... Outer electrode, 4... Metal shell, 4a... Trunk, 4b... Seat surface, 4c... Thin wall portion, 4d, 4l... Vertical hole, 5,
25, 35...Pressure sensor, 9, 29...Pressure receiving surface, 10...Gasket, 20...Engine head.

Claims

[Claims for Utility Model Registration] (1) An insulator that holds a center electrode inside and an outer electrode that supports the insulator from its outer periphery and protrudes from its tip to form a spark gap between it and the center electrode. In a spark plug consisting of a metal shell, a vertical hole is formed in the body of the metal shell to form a thin walled part with a bottom on the side of the mounting seat to the engine head, and a pressure sensor is built in the vertical hole. A spark plug with a built-in pressure sensor, characterized in that when the metal shell is mounted on an engine head, a plate-shaped gasket attached to the seat surface of the metal shell presses a thin walled portion of the metal shell. (2) The spark plug with a built-in pressure sensor according to claim 1, wherein the vertical hole and the pressure sensor are cylindrical. (3) The pressure sensor built-in spark plug according to claim 1, wherein the vertical hole and the pressure sensor are annular.