JPH07211434A

JPH07211434A - Ignition plug with hole

Info

Publication number: JPH07211434A
Application number: JP3079394A
Authority: JP
Inventors: Osamu Akiyama; 修秋山
Original assignee: Individual
Current assignee: Individual
Priority date: 1994-01-17
Filing date: 1994-01-17
Publication date: 1995-08-11

Abstract

PURPOSE:To grow ignited flare enough and facilitate the ignition and explosion within a cylinder by widening the center of the head of the side electrode of a thermal ignition plug for a gasoline engine into hood shape, and boring a hole here, and recessing the head. CONSTITUTION:A high-speed fuel mixed vortex, which has entered a cylinder, enters the hole of a subchamber element provided at the center of the electrode head of an ignition plug and slows down the velocity, and the flame generated by discharge can be made possible to grow without being cooled with a plug within the hole. That is, the center of the head of the side electrode of a conventional thermal ignition plug 1 is widened into hood shape, and a hole 3 is opened here, and also the center electrode 4 is recessed. Here, the hood 2 may be square-shaped or round-shaped, and the center electrode 4 may be concave or cone-shaped. This way, it becomes possible to cope with the request of high voltage at quick acceleration.

Description

Detailed Description of the Invention

【０００１】[0001]

【産業上の利用分野】この発明は、ガソリンエンジン用
点火プラグの着火の方法に関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for igniting a spark plug for a gasoline engine.

【０００２】[0002]

【従来の技術】従来、ガソリンエンジン用点火プラグの
電極頭部は、単に平坦なもの、又はＶ型やＵ型の溝を設
けたもの、側方電極を３本、４本にしたもの、中心電極
を細くしたもの、或いは周囲を絞って補助スパークを利
用するもの等のものがあった。2. Description of the Related Art Conventionally, the electrode head of a spark plug for a gasoline engine is simply flat or has V-shaped or U-shaped grooves, three or four side electrodes, and a center electrode. There are those in which the electrodes are made thin, or those in which the auxiliary spark is used by narrowing the circumference.

【０００３】[0003]

【発明が解決しようとする課題】これには次のような欠
点があった。エンジンが冷却等、環境の悪いときに始動
する為には、濃い混合気体を吸入させるが、シリンダー
内の高速燃料混合渦流や、点火プラグ自体に冷やされ
て、放電により発生した火炎が十分に成長せず着火困難
な状況があった。However, this has the following drawbacks. In order to start the engine when the environment is bad such as cooling, a rich mixed gas is sucked in, but the high-speed fuel mixing swirl in the cylinder and the spark plug itself are cooled, and the flame generated by the discharge grows sufficiently. Without doing so, there was a difficult situation to ignite.

【０００４】[0004]

【課題を解決するための手段】課題を解決するために
は、シリンダー内が低温で点火プラグが冷えきっていて
も、一定電圧当たりでより効果的な着火爆発が起こるよ
うにする。本発明は、点火プラグの側方電極頭部の中央
部分をフード状にし、この中心部分に穴をあけ、かつ、
中心電極頭部を凹状にしておく。In order to solve the problem, even if the temperature in the cylinder is low and the spark plug is cold, a more effective ignition explosion occurs at a constant voltage. In the present invention, the central portion of the side electrode head of the spark plug is formed into a hood shape, and a hole is formed in this central portion, and
Make the center electrode head concave.

【０００５】[0005]

【作用】シリンダー内に入った高速燃料混合渦流が、点
火プラグの電極頭部の中央部分の、副室の要素を持たせ
たホールに入り、流速を緩める。また、放電により発生
した火炎は、ホール内でプラグに冷却されず成長する。The vortex flow of the high-velocity fuel mixed in the cylinder enters the hole having the element of the sub chamber in the central portion of the electrode head of the spark plug to slow down the flow velocity. Further, the flame generated by the discharge grows in the hole without being cooled by the plug.

【０００６】[0006]

【実施例】本発明を図１に示す事例に基づいて説明す
る。従来の熱型点火プラグ１の側方電極頭部の中央部分
を図のように広げて、フード状にした２、２の中央部分
に穴３をあけておき、中心電極頭部４を凹状にしてお
く。なお、側方電極頭部のフードは、角形、或いは丸型
でもよい。中心電極頭部は凹レンズ状、すり鉢状、ある
いは周囲の一部が切れていてもよい。本発明の実証実験
の為使用したエンジンは、１５００ＣＣで１０万キロ以
上走行したものを活用した。DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described based on the case shown in FIG. The center part of the side electrode head of the conventional thermal ignition plug 1 is widened as shown in the figure, and a hole 3 is opened in the center part of the hood-shaped 2, 2 to make the center electrode head 4 concave. Keep it. The hood of the side electrode head may be square or round. The center electrode head may have a concave lens shape, a mortar shape, or a part of the periphery may be cut off. The engine used for the demonstration test of the present invention was an engine that ran at 100,000 km or more at 1500 CC.

【０００７】[0007]

【発明の効果】この発明は、実施例に示すように、ガソ
リンエンジン用熱型点火プラグの側方電極頭部の中央部
分を広げてフード状にし、この中央部分に穴を明け、か
つ、中心電極頭部を凹状にしたことにより、このホール
の部分に入ったシリンダー内の高速燃料渦流混合気は流
速が緩み、またエンジンが相当に冷え込んだ場合でも、
放電により発火した火炎がプラグ頭部で直接冷やされ
ず、副屋と同様な効果で放電により発火した火炎が十分
に成長し、シリンダー内での着火爆発が容易に起こる。
また、急加速時における高電圧要求にも対処できるもの
である。According to the present invention, as shown in the embodiments, the central portion of the side electrode head of a thermal ignition plug for a gasoline engine is widened to form a hood, and a hole is formed in the central portion and By making the electrode head concave, the flow velocity of the high-speed fuel swirl mixture in the cylinder that entered this hole becomes slow, and even when the engine cools considerably,
The flame ignited by the electric discharge is not directly cooled by the plug head, and the flame ignited by the electric discharge grows sufficiently by the same effect as in the secondary house, and the ignition and explosion easily occurs in the cylinder.
Further, it is possible to cope with a high voltage demand at the time of sudden acceleration.

[Brief description of drawings]

【図１】本発明の事例を示す点火プラグ頭部の断面図で
あるFIG. 1 is a sectional view of a spark plug head showing an example of the present invention.

[Explanation of symbols]

点火プラグ本体１、側方電極頭部をフード状にした中央
部分２、３は２にあけたけた穴で、４は中心電極頭部の
凹状にした部分である。The spark plug body 1 and the central portions 2 and 3 in which the side electrode heads are formed into a hood are holes formed in the reference numeral 2, and 4 is a concave portion of the center electrode head.

Claims

[Claims]

1. A spark plug having a hole in a central portion of an electrode head of a spark plug for a gasoline engine.