JPS6352285U

JPS6352285U -

Info

Publication number: JPS6352285U
Application number: JP14512586U
Authority: JP
Priority date: 1986-09-24
Filing date: 1986-09-24
Publication date: 1988-04-08

Description

[Brief explanation of the drawing]

第１図イは本考案圧力センサ内蔵式スパークプ
ラグの実施例の一部切截縦断面図、同図ロは本考
案プラグの実施例に用いたパツキンの拡大半截斜
視図、第２図はプラグ締付けトルクとセンサ出力
との関係を示す実験グラフ、第３図は従来の圧力
センサ内蔵式スパークプラグの一部切截縦断面図
である。１：磁器絶縁体、１ａ：肩部、１ｃ：先端側段
差部、２：中心電極、３：主体金具、３ａ：胴部
、３ｃ：ねじ部、３ｄ：段座、５，６，１０：パ
ツキン、７：圧力センサ、１０ａ：環状成形体、
１０ｂ：環状板ばね。 Figure 1A is a partially cutaway vertical cross-sectional view of an embodiment of the spark plug with a built-in pressure sensor of the present invention, Figure 1B is an enlarged half-cut perspective view of the packing used in the embodiment of the spark plug of the present invention, and Figure 2 is a plug FIG. 3 is an experimental graph showing the relationship between tightening torque and sensor output, and is a partially cut away longitudinal sectional view of a conventional spark plug with a built-in pressure sensor. 1: Porcelain insulator, 1a: Shoulder, 1c: Tip side step, 2: Center electrode, 3: Metal shell, 3a: Body, 3c: Threaded portion, 3d: Step seat, 5, 6, 10: Packing , 7: Pressure sensor, 10a: Annular molded body,
10b: Annular leaf spring.

Claims

[Claims for Utility Model Registration] (1) A porcelain insulator 1 holding a center electrode 2; A spark gap is formed between the tip of the electrode 2 and the ground electrode 4, and
In a spark plug with a built-in pressure sensor, the pressure sensor 7 is built into the inner cavity of the body 3a of the metal shell 3 above the shoulder 1d of the ceramic insulator 1. A metal gasket 5 is interposed between the step seat 3b at the bottom and the lower step portion 1b of the large diameter portion 1a of the porcelain insulator 1, and the step seat 3d in the inner cavity of the threaded portion 3c of the metal shell 3 is interposed between the step seat 3b and the porcelain insulator 1. A pressure sensor characterized in that a packing 10 made of a metal having heat resistance of 500° C. or more, good thermal conductivity, and a low Young's modulus is interposed between the body 1 and the tip side stepped portion 1c. Built-in spark plug. (2) The packing 10 interposed between the stepped seat 3d in the internal cavity of the threaded portion 3c of the metal shell 3 and the stepped portion 1c of the ceramic insulator 1 is a medium-sized O-ring or C-ring made of Al, Cu, Ag, or an alloy thereof. A spark plug with a built-in pressure sensor according to claim 1 of the utility model registration claim consisting of: (3) The packing 10 interposed between the stepped seat 3d of the internal cavity of the threaded portion 3c of the metal shell 3 and the stepped portion 1c of the ceramic insulator 1 is inside an annular body 10a having a U-shaped cross section and made of Al, Cu, Ag, etc. A spark plug with a built-in pressure sensor according to claim 1, which is registered as a utility model and has a structure in which a steel leaf spring 10b formed in a cross-section shape is built-in.