JPS59180067A - Multiple ignition device for two-cycle engine - Google Patents

Multiple ignition device for two-cycle engine

Info

Publication number
JPS59180067A
JPS59180067A JP5223083A JP5223083A JPS59180067A JP S59180067 A JPS59180067 A JP S59180067A JP 5223083 A JP5223083 A JP 5223083A JP 5223083 A JP5223083 A JP 5223083A JP S59180067 A JPS59180067 A JP S59180067A
Authority
JP
Japan
Prior art keywords
plug
ignition
plugs
central part
combustion chamber
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
JP5223083A
Other languages
Japanese (ja)
Other versions
JPH0251072B2 (en
Inventor
Koichi Enomoto
榎本 恒一
Kozo Amano
天野 孝三
Yoshio Nakahara
中原 吉男
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Nippon Tokushu Togyo KK
Niterra Co Ltd
Original Assignee
NGK Spark Plug Co Ltd
Nippon Tokushu Togyo KK
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by NGK Spark Plug Co Ltd, Nippon Tokushu Togyo KK filed Critical NGK Spark Plug Co Ltd
Priority to JP5223083A priority Critical patent/JPS59180067A/en
Publication of JPS59180067A publication Critical patent/JPS59180067A/en
Publication of JPH0251072B2 publication Critical patent/JPH0251072B2/ja
Granted legal-status Critical Current

Links

Classifications

    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02PIGNITION, OTHER THAN COMPRESSION IGNITION, FOR INTERNAL-COMBUSTION ENGINES; TESTING OF IGNITION TIMING IN COMPRESSION-IGNITION ENGINES
    • F02P15/00Electric spark ignition having characteristics not provided for in, or of interest apart from, groups F02P1/00 - F02P13/00 and combined with layout of ignition circuits
    • F02P15/08Electric spark ignition having characteristics not provided for in, or of interest apart from, groups F02P1/00 - F02P13/00 and combined with layout of ignition circuits having multiple-spark ignition, i.e. ignition occurring simultaneously at different places in one engine cylinder or in two or more separate engine cylinders
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02PIGNITION, OTHER THAN COMPRESSION IGNITION, FOR INTERNAL-COMBUSTION ENGINES; TESTING OF IGNITION TIMING IN COMPRESSION-IGNITION ENGINES
    • F02P15/00Electric spark ignition having characteristics not provided for in, or of interest apart from, groups F02P1/00 - F02P13/00 and combined with layout of ignition circuits
    • F02P15/02Arrangements having two or more sparking plugs
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02BINTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
    • F02B75/00Other engines
    • F02B75/02Engines characterised by their cycles, e.g. six-stroke
    • F02B2075/022Engines characterised by their cycles, e.g. six-stroke having less than six strokes per cycle
    • F02B2075/025Engines characterised by their cycles, e.g. six-stroke having less than six strokes per cycle two

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Ignition Installations For Internal Combustion Engines (AREA)

Abstract

PURPOSE:To improve the output and the accelerating property of the engine and permit to reduce fuel consumption by a method wherein ignition plugs are arranged at the central part of a combustion chamber and near a suction port so as to combine at least two limited ignitions. CONSTITUTION:The ignition plug 7 is attached to the central part S of the combustion chamber 6a of a cylinder head 6 and the ignition plugs 8, 9, 10 are provided radially surrounding the central part. The plug 8 is arranged in the suction port A on a horizontal line connecting the suction port and an exhaust port while the plugs 9, 10 are arranged at positions B, D on an axial line orthogonal to the horizontal line. According to this arrangement, the plug at the central part S improves the fuel consumption with respect to a vehicle speed the best and the plugs at the suction port A as well as the part B improve the same a little while the plug in the exhaust port C does not improve the same. In case of combination ignition, the output and the accelerating property of the engine may be improved and the fuel consumption may be reduced when the plug at the central part S is combined with at least on of the plugs at the parts A, B, D. Especially, the combination of S and A is effective. The combination with the plug in the exhaust port C has no effect and it introduces high cost.

Description

【発明の詳細な説明】 本発明は内燃4幾関のうち、特に2サイクルエン’)ン
ニpJ数の点火プラグを取付けてエンジン性能を向上さ
せる2サイクルエンジンの多点火装置に関する。
DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a multi-ignition system for a two-stroke engine, which improves engine performance by attaching spark plugs with a number of pJ among four internal combustion engines.

内燃観閲の着火性を向上させて省燃費化を達成させるた
めの手段として1点火プラグにおいては燃焼室内に発火
部を可及的に突出し、火花ギャップを拡大させることが
効果的であることがよく知られているが、これだけでは
十分に目的を満足させることができない。一方エンジン
側では点火進角の効果が大であるが、該進角を進めると
ノッキングの発生を伴い、且つ点火プラグのプレイグニ
ツシヨンをも誘発し易くなることから望ましくな(、シ
かもノッキング制御を行うと大巾なコスト高となる欠点
があった。
As a means to improve the ignition performance of internal combustion inspection and achieve fuel efficiency, it is often effective to make the ignition part of a spark plug protrude as much as possible into the combustion chamber and widen the spark gap. Although this is known, this alone is not sufficient to satisfy the purpose. On the engine side, on the other hand, the effect of advancing the ignition angle is great, but advancing the advance angle is accompanied by the occurrence of knocking and is likely to induce spark plug pre-ignition, which is undesirable. This had the drawback of significantly increasing costs.

また、内燃機関に複数の点火プラグを設けて火炎伝播を
速くし着火性を向上させることが知られている。ところ
が1本発明者らは2サイクルエンジンにおいて点火プラ
グの取付位置によって出力、加速性に太き(影響し、且
つ点火プラグの取付位置を有利に胆合せることによって
燃費低減効果が容易に得られることを見出したものであ
る。
It is also known to provide an internal combustion engine with a plurality of spark plugs to speed up flame propagation and improve ignition performance. However, the present inventors have discovered that in a two-stroke engine, the installation position of the spark plug affects the output and acceleration, and that by adjusting the installation position of the spark plug advantageously, the effect of reducing fuel consumption can be easily obtained. This is what we discovered.

本発明はかかる観点に鑑み1点火プラグをシリンダーヘ
ッドの燃焼室の中央部と吸入孔部の付近に限定する少な
くとも2点火の組合せによつて、出力、加速性を向上し
て燃費が大巾に低減可能とした2サイクルエンジンの多
点火装置を提供しようとするものである。
In view of this, the present invention provides a combination of at least two ignitions that limit one spark plug to the central part of the combustion chamber of the cylinder head and the vicinity of the suction hole, thereby improving output and acceleration and greatly reducing fuel consumption. The purpose is to provide a multi-ignition device for a two-stroke engine that can reduce the amount of fuel used.

以F本発明を図面の実施例によって説明すも第1図及び
第2図は本発明の実施例に用いた単気筒2サイクルエン
ジンの要部を示したものであり1図中、1はシリン斧ブ
ロック、2は該シリンダーブロックに設けられた吸入孔
で図示しない気化器及びクランク室に連通している。
Hereinafter, the present invention will be explained with reference to the embodiments shown in the drawings. Figures 1 and 2 show the main parts of a single-cylinder two-stroke engine used in the embodiments of the present invention. In Figure 1, 1 indicates the cylinder. The ax block 2 communicates with a carburetor and a crank chamber (not shown) through a suction hole provided in the cylinder block.

3は排気孔、4はピストン、5はピストンリングである
。6はシリンダーヘッドであり、前記ピストンとの間に
半球型の燃焼室6aを備えている。7.8,9.10は
点火プラグであり。
3 is an exhaust hole, 4 is a piston, and 5 is a piston ring. A cylinder head 6 is provided with a hemispherical combustion chamber 6a between it and the piston. 7.8 and 9.10 are spark plugs.

前記シリンダーヘッド6に螺刻さイまた取付わじで各々
燃焼室6a内に露出して螺着されている。
They are screwed into the cylinder head 6 with threads or mounting holes exposed inside the combustion chamber 6a.

これら点火プラグは第2図に示すように、シリンダーヘ
ッド6の燃焼室6aの略中央部Sに点火プラグ7が取付
けられると共に、その中央部を取り囲んで放射状に点火
プラグ8.9.10が夫々装着されている。そして点火
プラグ8は吸気孔−排気孔を結ぶ水平線上の吸気孔部A
に。
As shown in FIG. 2, these spark plugs include a spark plug 7 attached to a substantially central portion S of a combustion chamber 6a of a cylinder head 6, and spark plugs 8, 9, and 10 radially surrounding the central portion. It is installed. The spark plug 8 is located at the intake hole part A on the horizontal line connecting the intake hole and the exhaust hole.
To.

9とlOは前記水平線と直角をなす輪心線上のB及びD
に配設されている。なお、前記BとD、を配するシリン
ダーブロック側に(は吸入空気を混合する掃気孔が設け
られている。また点線Cは実験に用いた点火プラグ取付
けのための排気孔部を示したものである。
9 and lO are B and D on the ring center line that is perpendicular to the horizontal line.
It is located in In addition, on the side of the cylinder block where B and D are located, there is a scavenging hole for mixing intake air.The dotted line C indicates the exhaust hole for installing the spark plug used in the experiment. It is.

次に本発明の点火プラグの取付位置と有利な点火組合せ
の伺成について実験結果を用いて述べる。
Next, the mounting position of the spark plug of the present invention and the development of an advantageous ignition combination will be described using experimental results.

実験は120ccjli気筒の実車を用いて、第2図に
示すように点火プラグ(88EM火花ギャップ0.9聰
)を各位置S、 At 1’3. c、 Dに装着して
性能評1品した。
The experiment was conducted using an actual vehicle with a 120cc cylinder, and as shown in Fig. 2, the spark plug (88EM spark gap 0.9cm) was set at each position S, At 1'3. C and D were installed and one performance evaluation was conducted.

(1)点火プラグの取付位置の影響として、第3図に示
すように車速に対する燃費は中央部Sが最も良(1次い
て吸入孔部A、Bの順となり、排気孔部Cは最も悪(効
果的でない。
(1) Regarding the influence of the installation position of the spark plug, as shown in Figure 3, the fuel efficiency with respect to vehicle speed is the best in the central part S (the first is the intake hole part A and B, and the worst in the exhaust hole part C). (Not effective.

(2)前記点火プラグ位置を種々組合せて点火した場合
の性能を侑認した結末、燃焼室の中央部Sと吸入孔部A
、B、Dの少な(とも1箇所と組合せることが出力、加
速性を向上して燃費低減に効果的であり、特に中央孔S
と吸入孔部Aの組合せが有効である。なお排気孔部Cと
の組合せは殆ど影響がなく個数の増加する分だけコスト
高となる。
(2) The result of appreciating the performance when igniting with various combinations of the spark plug positions, the central part S of the combustion chamber and the suction hole part A.
, B, and D (combined with one location) is effective for improving output and acceleration and reducing fuel consumption, especially for central hole S.
The combination of and suction hole portion A is effective. Note that the combination with the exhaust hole portion C has almost no effect, and the cost increases as the number increases.

第4図、第5図には中央部S、S+A、S+A+B+D
、S+A+B十C+Dについて、出力(60VHと80
 K/H)及び加速性(40に/HからのスロットルA
加速)の結果を示した。なお排気孔部Cを含む全部に点
火プラグを取付けると1点火進角の進み側で出力の低下
をきたす。
In Figures 4 and 5, the central part S, S+A, S+A+B+D
, S+A+B and C+D, the output (60VH and 80
K/H) and acceleration (throttle A from/H to 40
(acceleration). Note that if a spark plug is attached to the entire spark plug including the exhaust hole portion C, the output will decrease on the advance side of one ignition advance.

第6図は2点火以上の組合せによる燃費性能を示したも
ので、中央部Sの単一点火に比較して、中央部Sと吸入
孔部A、B、Dを組合せた場合には5箇所全部の同時点
火に近接する性能が得らねる。
Figure 6 shows the fuel economy performance of a combination of two or more ignitions.Compared to a single ignition in the center S, there are five ignition points in the case of a combination of the center S and suction holes A, B, and D. It is not possible to obtain performance close to all ignitions at the same time.

なお実験に用いた2点火以上は全て同時点火させること
で性能を評価したが、必ずしも同時点火は必要でなく、
放射状の周辺部の点火プラ5− グは中央部に比べて点火時期を若干ずらせてもよい。
In addition, performance was evaluated by igniting all the two or more ignitions used in the experiment at the same time, but simultaneous ignition is not necessarily necessary.
The ignition timing of the ignition plug 5 in the radial peripheral portion may be slightly shifted from that in the central portion.

以上の如(11本発明の2サイクルエンジンの多点火装
置は1点火プラグかシリンダーヘッドの燃焼室の中央部
と該中央部を取り囲む吸入孔部側との少な(とも11所
の組合せによる点火によって、出力、 im速性を向上
して従来に比べて大巾な燃費低減を達成することができ
る。又2サイクルエンジンはバルブ機構がないため点火
プラグの複数の配設が容易であり、更に点火コイルは従
来の捨て火中を増設点火プラグに流用できるため、全体
的にもコスト高とならずに2サイクルエンジン性能を高
めることができる。
As described above (11), the multiple ignition system for the two-stroke engine of the present invention has one spark plug, or a combination of 11 spark plugs, one in the center of the combustion chamber of the cylinder head, and one in the suction hole surrounding the center. It is possible to improve fuel efficiency, output, and speed, and achieve a significant reduction in fuel consumption compared to conventional engines.Also, since a two-stroke engine does not have a valve mechanism, it is easy to install multiple spark plugs, and Since the coil can be used as an additional spark plug instead of the conventional one, it is possible to improve the performance of the two-stroke engine without increasing the overall cost.

【図面の簡単な説明】[Brief explanation of the drawing]

第1図は不発明の実施例を示した2サイクルエンジンの
要部断面図、第2図はi1図のイーイ切断の平面図、第
3図〜第6図は実験結果を示したもので、第3図は単一
点火の各取付位置における燃費特注、第4〜第6図は多
点火における夫々出力、加速、燃費特性を示す。 6− 6・・・・・・ンリンダーヘッド、6a・旧・・燃焼室
。 7.8,9.10・・・・・・点火プラグ、S・・団・
中央部−A、B、D・・・・・・吸入孔部 特許出願人 日本特殊陶業株式会社 7− Ml 図 第2図 区 −販    叡− 力。 −IE  R色− 図
Fig. 1 is a sectional view of the essential parts of a two-stroke engine showing an embodiment of the invention, Fig. 2 is a plan view of the E-cut of Fig. i1, and Figs. 3 to 6 show experimental results. Fig. 3 shows the fuel efficiency custom made for each mounting position for single ignition, and Figs. 4 to 6 show the output, acceleration, and fuel efficiency characteristics for multiple ignition. 6- 6... Nlinder head, 6a old... combustion chamber. 7.8, 9.10... Spark plug, S... Group...
Central part - A, B, D... Suction hole part Patent applicant: NGK Spark Plug Co., Ltd. 7 - Ml Figure 2 - Sales force. -IE R color- Diagram

Claims (1)

【特許請求の範囲】[Claims] (1)  シリンダーヘッドの燃焼室内に露出する複数
の点火プラグを取付けて成る2サイクルエンジンにおい
て、前記点火プラグは燃焼室の中央部(S)と該中央部
を取り囲んで放射状に配設されると共に、その点火プラ
グか前記中央部(S)と排気孔部(C)を除く少な(と
も吸入孔部(A、B、D)の1箇所と組合せて点火させ
ることを特徴とする2サイクル工ンジンノ多点火装置。
(1) In a two-stroke engine that is equipped with a plurality of spark plugs exposed in a combustion chamber of a cylinder head, the spark plugs are arranged in a central portion (S) of the combustion chamber and radially surrounding the central portion. , a two-cycle engine characterized in that the ignition plug is ignited by combining the spark plug with one part of the suction hole part (A, B, D) excluding the central part (S) and the exhaust hole part (C). Multi-ignition device.
JP5223083A 1983-03-28 1983-03-28 Multiple ignition device for two-cycle engine Granted JPS59180067A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP5223083A JPS59180067A (en) 1983-03-28 1983-03-28 Multiple ignition device for two-cycle engine

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP5223083A JPS59180067A (en) 1983-03-28 1983-03-28 Multiple ignition device for two-cycle engine

Publications (2)

Publication Number Publication Date
JPS59180067A true JPS59180067A (en) 1984-10-12
JPH0251072B2 JPH0251072B2 (en) 1990-11-06

Family

ID=12908928

Family Applications (1)

Application Number Title Priority Date Filing Date
JP5223083A Granted JPS59180067A (en) 1983-03-28 1983-03-28 Multiple ignition device for two-cycle engine

Country Status (1)

Country Link
JP (1) JPS59180067A (en)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5261367A (en) * 1990-03-30 1993-11-16 Mazda Motor Corporation Engine and method for designing same
US5465695A (en) * 1991-08-30 1995-11-14 Mazda Motor Corporation Ignition system for internal combustion engine
JP2006161679A (en) * 2004-12-07 2006-06-22 Suzuki Motor Corp Ignition device for two cycle engine
US7278382B1 (en) 2006-05-25 2007-10-09 Suzuki Motor Corporation Water-cooled two-cycle engine
EP1895154A1 (en) * 2006-03-07 2008-03-05 Miyama, Inc. Multipoint ignition engine

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5261367A (en) * 1990-03-30 1993-11-16 Mazda Motor Corporation Engine and method for designing same
US5465695A (en) * 1991-08-30 1995-11-14 Mazda Motor Corporation Ignition system for internal combustion engine
JP2006161679A (en) * 2004-12-07 2006-06-22 Suzuki Motor Corp Ignition device for two cycle engine
JP4649970B2 (en) * 2004-12-07 2011-03-16 スズキ株式会社 Ignition device for two-cycle engine
EP1895154A1 (en) * 2006-03-07 2008-03-05 Miyama, Inc. Multipoint ignition engine
US7661402B2 (en) 2006-03-07 2010-02-16 Miyama, Inc. Multipoint ignition engine
US7278382B1 (en) 2006-05-25 2007-10-09 Suzuki Motor Corporation Water-cooled two-cycle engine

Also Published As

Publication number Publication date
JPH0251072B2 (en) 1990-11-06

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