JPS6154690U

JPS6154690U -

Info

Publication number: JPS6154690U
Application number: JP13867284U
Authority: JP
Priority date: 1984-09-14
Filing date: 1984-09-14
Publication date: 1986-04-12

Description

[Brief explanation of the drawing]

第１図イは本考案点火プラグの実施例の要部を
示す縦断面図、同図ロ及びハは同図イにおける板
パツキンＢの斜視図で、ロは通常時、ハは温度上
昇時における状態を示したもの、第２図は先行技
術による耐汚損対策プラグの従来例を示す要部縦
断面図である。１：中心電極、２：磁器絶縁体、２ａ：発火脚
部、２ｂ：上部段差部、２ｃ：下部段差部、３：
主体金具、３ｂ：上部段座、３ｃ：下部段座、３
ｄ：溝、４：電気絶縁油、５：切欠溝、５ａ：開
口端、Ａ：シールパツキン、Ｂ：板パツキン、Ｂ
−_１：合せ目、Ｇ：間隙。 Fig. 1A is a vertical sectional view showing the main part of the embodiment of the spark plug of the present invention, B and C are perspective views of the plate packing B in Fig. FIG. 2 is a vertical cross-sectional view of a main part of a conventional example of a stain-resistant plug according to the prior art. 1: Center electrode, 2: Porcelain insulator, 2a: Firing leg, 2b: Upper step, 2c: Lower step, 3:
Main metal fitting, 3b: Upper step seat, 3c: Lower step seat, 3
d: Groove, 4: Electrical insulation oil, 5: Notch groove, 5a: Open end, A: Seal packing, B: Plate packing, B
_-1 : Seam, G: Gap.

Claims

[Claims for Utility Model Registration] (1) The porcelain insulator 2 holding the center electrode 1 is supported by the upper step seat 3b and the lower step seat 3c of the inner cavity of the metal shell 3, and the main body between the step seats 3b and 3c is Electrical insulating oil 4 is stored in the gap between the inner wall of the metal fitting 3 and the outer periphery of the porcelain insulator 2 surrounded by the metal fitting 3, and as the temperature rises, the electric insulating oil 4 spreads onto the surface of the firing leg 2a of the porcelain insulator 2. In the ignition plug, which has anti-fouling measures such as oozing and flowing to form a film and preventing the ignition leg 2a from being soiled by this film, the upper step 3b of the inner cavity of the metal shell 3 and the upper step of the porcelain insulator 2. 2
A seal packing A is arranged between b and
Between the lower step seat 3c of the metal shell 3 and the lower step portion 2c that divides the firing leg portion 2a of the porcelain insulator 2,
Seam B- ₁ opens due to temperature rise and electrical insulating oil 4
1. A spark plug comprising a split ring-shaped plate packing B made of a shape memory alloy and having a memorized shape that forms a gap G that serves as an introduction passage. (2) A utility model according to claim 1, wherein a spiral cutout groove 5 is formed on the outer circumferential surface of the firing leg 2a of the porcelain insulator 2, which serves as a groove for introducing electrical insulating oil 4 into the seepage. spark plug.