JPS60136084U

JPS60136084U - spark plug

Info

Publication number: JPS60136084U
Application number: JP2413084U
Authority: JP
Inventors: 広沢　邦之
Original assignee: 日本特殊陶業株式会社
Priority date: 1984-02-22
Filing date: 1984-02-22
Publication date: 1985-09-10

Abstract

(57)【要約】本公報は電子出願前の出願データであるた
め要約のデータは記録されません。(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Brief explanation of the drawing]

第１図および第２図は、本考案による着火性の改善され
た点火プラグの側面図と上面図、第３図は本考案の別の
実施態様についての放電部位の部分拡大図、第４図は本
考案による点火プラグと在来の同種点火プラグとの着火
性能比較グラフである。　　− 図中、１・・・棒状中心電極、２・・・電気絶縁材、３
・・・筒状取付金具、１ａ・・・中心電極先端面の絶縁
材から露出した部分、５・・・露出部を設けるための貫
孔、６・・・円錐形の凸起部、Ａ・・・放電空隙、Ｂ・
・・在−来タイブの点火プラグの希薄着火限界グラフ、
Ｃ・・・本考案による第１のタイプのグラフの限界グラ
フ、Ｄ・・・本考案による第２のタイプのグラフの限界
グラフ。1 and 2 are a side view and a top view of a spark plug with improved ignitability according to the present invention, FIG. 3 is a partially enlarged view of a discharge site of another embodiment of the present invention, and FIG. 4 is a graph comparing the ignition performance of the spark plug according to the present invention and a conventional spark plug of the same type. - In the figure, 1... Rod-shaped center electrode, 2... Electrical insulating material, 3
... Cylindrical mounting bracket, 1a... Portion exposed from the insulating material on the tip surface of the center electrode, 5... Through hole for providing the exposed portion, 6... Conical protrusion, A.・Discharge gap, B・
・・Lean ignition limit graph of conventional type spark plugs,
C... Limit graph of the first type of graph according to the present invention, D... Limit graph of the second type of graph according to the present invention.

Claims

[Scope of utility model registration request]

(1) A cylindrical mounting bracket is fitted around the rod-shaped center electrode via an insulator, and the tip of the outer electrode provided on the mounting bracket is bent so as to be on the axis of the center electrode. In spark plugs that face the electrode to form a discharge gap, □ The rod-shaped center electrode must be covered with an electrically insulated wire, except for a small exposed portion facing the discharge part of the outer electrode on the tip surface. A spark plug featuring

(2) The exposed portion of the center electrode tip surface is provided at the part of the electrode tip surface that is farthest from the legs of the outer electrode, as set forth in claim 1 of the utility model registration claim. spark plug.

(3) The area of the exposed portion of the center electrode tip surface is 174 to 1/2 of the area of the center electrode optical end surface, as claimed in claim 1 or 2 of the utility model registration claim. spark plug.

(4) The through hole provided to expose a part of the tip surface of the center electrode covered with an electrically insulating material is characterized in that it has a conical shape with a widening bottom or a shape with a bottom widening similar to a slit. A spark plug according to any one of claims 1 to 3 of the utility model registration claims.

(5) The ignition device according to any one of claims 1 to 4 of the claims for utility model registration, characterized in that the discharge portion of the outer electrode is formed with a protruding portion having a conical shape or a similar shape. plug.