JPH0225194U

JPH0225194U -

Info

Publication number: JPH0225194U
Application number: JP10429888U
Authority: JP
Priority date: 1988-08-06
Filing date: 1988-08-06
Publication date: 1990-02-19

Description

[Brief explanation of drawings]

第１図は、本考案の鍔付中心電極を有するスパ
ークプラグの実施例を示す一部断面図、第２図お
よび第３図はその鍔付中心電極後端部の加工工程
図、第４図はその要部断面図、第５図は他の例の
要部断面図、第６図は、従来の鍔付中心電極を有
するスパークプラグを示す一部断面図である。図中１…軸孔、２…絶縁体、３…中心電極、
４…中軸、６…電気抵抗体、７…導電性ガラスシ
ール材、３１…鍔状頭部、３２…後端部、３４，
３５…切込部分。 FIG. 1 is a partial sectional view showing an embodiment of a spark plug having a flanged center electrode of the present invention, FIGS. 2 and 3 are process diagrams of the rear end of the flanged center electrode, and FIG. 4 5 is a sectional view of a main part thereof, FIG. 5 is a sectional view of a main part of another example, and FIG. 6 is a partial sectional view showing a conventional spark plug having a flanged center electrode. In the figure 1... shaft hole, 2... insulator, 3... center electrode,
4... Center shaft, 6... Electrical resistor, 7... Conductive glass sealing material, 31... Flange-shaped head, 32... Rear end, 34,
35...Notch part.

Claims

[Scope of Claim for Utility Model Registration] A cylindrical metal shell; a cylindrical insulator that is fitted into the metal shell and has a shaft hole formed with a small diameter on the front end side and a large diameter on the rear end side; a shaft-shaped center electrode that is fitted into the tip side of the insulator, the tip of which protrudes from the tip surface of the insulator, and the protruding portion has a diameter enlarged in the shape of a brim and is in contact with the tip surface of the insulator; A spark plug having a flanged center electrode that is fitted into the rear end side of the shaft hole, has a rear end protruding from the rear end surface of the insulator, and has a central shaft whose protruding portion serves as a terminal. The center electrode has a rear end portion protruding into the large diameter portion of the shaft hole that is compressed and bent by a plurality of cut portions,
It fits into the annular surface that forms the boundary between the small diameter and large diameter shaft holes, and fills the inside of the shaft hole of the insulator near the bent rear end of the flanged center electrode with a conductive glass sealing material. A spark plug having a flanged center electrode characterized in that the electrode is fixed to an insulator and the shaft hole is sealed.