JPS60150426A - Two cycle engine - Google Patents

Two cycle engine

Info

Publication number
JPS60150426A
JPS60150426A JP771384A JP771384A JPS60150426A JP S60150426 A JPS60150426 A JP S60150426A JP 771384 A JP771384 A JP 771384A JP 771384 A JP771384 A JP 771384A JP S60150426 A JPS60150426 A JP S60150426A
Authority
JP
Japan
Prior art keywords
sub
piston
chamber
crank chamber
pressure
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.)
Pending
Application number
JP771384A
Other languages
Japanese (ja)
Inventor
Minoru Takasu
高須　実
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.)
Suzuki Motor Corp
Original Assignee
Suzuki Motor Corp
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 Suzuki Motor Corp filed Critical Suzuki Motor Corp
Priority to JP771384A priority Critical patent/JPS60150426A/en
Publication of JPS60150426A publication Critical patent/JPS60150426A/en
Pending legal-status Critical Current

Links

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
    • F02B33/00—Engines characterised by provision of pumps for charging or scavenging
    • F02B33/02—Engines with reciprocating-piston pumps; Engines with crankcase pumps
    • F02B33/04—Engines with reciprocating-piston pumps; Engines with crankcase pumps with simple crankcase pumps, i.e. with the rear face of a non-stepped working piston acting as sole pumping member in co-operation with the crankcase
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
    • F02B33/00—Engines characterised by provision of pumps for charging or scavenging
    • F02B33/02—Engines with reciprocating-piston pumps; Engines with crankcase pumps
    • F02B33/06—Engines with reciprocating-piston pumps; Engines with crankcase pumps with reciprocating-piston pumps other than simple crankcase pumps
    • F02B33/22—Engines with reciprocating-piston pumps; Engines with crankcase pumps with reciprocating-piston pumps other than simple crankcase pumps with pumping cylinder situated at side of working cylinder, e.g. the cylinders being parallel
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
    • F02B75/00—Other engines
    • F02B75/02—Engines characterised by their cycles, e.g. six-stroke
    • F02B2075/022—Engines characterised by their cycles, e.g. six-stroke having less than six strokes per cycle
    • F02B2075/025—Engines characterised by their cycles, e.g. six-stroke having less than six strokes per cycle two

Abstract

PURPOSE:To raise the primary pressure in a crank chamber, substantially, by confronting a pressure chamber in a subcylinder assembly to a scavenging passage. CONSTITUTION:In a two cycle engine 1, a mixture is sucked into a crank chamber 9 from an intake port 12 in association with the raise of a main piston 7. Further, a subpiston 15 lowers in synchronizm with the motion of the main piston 7 to introduce the mixture into a pressure chamber 18 from the crank chamber 9. When the main piston 7 lowers so that the inside of the crank chamber 9 is compressed, the mixture in the crank chamber 9 is transferred under pressure into a combustion chamber 11 through a scavenging passage 10, and simultaneously, the subpiston 15 ascends to discharge the mixture in the pressure chamber 18 into the scavenging passage 10.

Description

【発明の詳細な説明】 〔発明の技術分野〕 本発明は、クランク室圧縮型２サイクルエンジンに関す
るもので、詳しくはその掃気システムの改良に関するも
のである。DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to a crank chamber compression type two-stroke engine, and more particularly to an improvement in its scavenging system.

〔従来技術〕[Prior art]

クランク室圧縮型２サイクルエンジンでは、周知のよう
に１　ピストンの上昇にょる負圧を利用し、混合気を一
旦クランク室に吸入し、ピストンの下降時にその混合気
を加圧して燃焼室に供給させている。したがって、混合
気の掃気効率は、クランク室の圧力、即ち一次圧力に大
きく影響される。As is well known, in a crank chamber compression type two-stroke engine, the air-fuel mixture is sucked into the crank chamber by using the negative pressure generated by the rise of the piston, and when the piston moves down, the air-fuel mixture is pressurized and supplied to the combustion chamber. I'm letting you do it. Therefore, the scavenging efficiency of the air-fuel mixture is greatly influenced by the pressure in the crank chamber, that is, the primary pressure.

ところで、従来は、この・−次圧力を高めるためにクラ
ンク室の容積を小さくすることが行なわれていたが、そ
れＫも限度があり、掃気効率をさらに高めることは困難
であった。Conventionally, the volume of the crank chamber has been reduced in order to increase this secondary pressure, but there is a limit to this, and it has been difficult to further increase the scavenging efficiency.

〔発明の目的〕[Purpose of the invention]

本発明の目的は、このような問題Ｋｍみて、さらに掃気
効率を高めた２サイクルエンジンを提供することにある
。SUMMARY OF THE INVENTION An object of the present invention is to solve this problem and provide a two-stroke engine with improved scavenging efficiency.

［発明の構成〕 即ち、本発明では、エンジンにサブシリンダアッセンブ
リを付設するとともに、その圧力室を掃気通路に連通さ
せ、エンジンの吸入行路において混合気を上記圧力室に
吸入させ、その混合気を掃気行路において吐出させて、
クランク室の一次圧力を実質的に高くするようにし、も
って上記目的を達成している。[Configuration of the Invention] That is, in the present invention, a sub-cylinder assembly is attached to an engine, and its pressure chamber is communicated with a scavenging passage, and an air-fuel mixture is sucked into the pressure chamber in the intake path of the engine, and the air-fuel mixture is Discharged in the scavenging path,
The above objective is achieved by substantially increasing the primary pressure in the crank chamber.

〔実施例〕〔Example〕

以下図面に示した実施例を参照しながら本発明を説明す
る。第１図、第２図は本発明に係る２サイクルエンジン
を概念的に示したものである。The present invention will be described below with reference to embodiments shown in the drawings. FIGS. 1 and 2 conceptually show a two-stroke engine according to the present invention.

この２サイクルエンジン１は、動力発生作用を行なうメ
インシリンダアッセンブリ２に掃気作用を補助するサブ
シリンダアッセンブリ３を付設させたものである。メイ
ンシリンダアッセンブリ２には、通常２サイクルエンジ
ンで採用されているメインクランクシャフト４、クラン
クピン５、コネクティングロッド６、メインピストン７
等が備えられており、またメインシリンダ８、クランク
室９、掃気通路１０、燃焼室１１、吸気ボート１２、排
気ボート１３が形成されている。サブシリンダアッセン
ブリ３ではそのサブシリンダ１４が掃気通路ｌＯの下方
に形成されており、サブピストン１５はコネクティング
ロッド１６、クランクピン１７を介してクランクシャフ
ト４に連結されている。そしてこのサブシリンダアッセ
ンブリ３では、圧力室１８が掃気通路１０に開口され、
またサブピストン１５がメインピストン７に対して１８
０度のクランク角開度をもってクランクシャフト４に取
付けられている。This two-stroke engine 1 has a main cylinder assembly 2 which performs a power generation function and a sub-cylinder assembly 3 which assists in scavenging operation. The main cylinder assembly 2 includes a main crankshaft 4, a crank pin 5, a connecting rod 6, and a main piston 7, which are normally used in two-stroke engines.
A main cylinder 8, a crank chamber 9, a scavenging passage 10, a combustion chamber 11, an intake boat 12, and an exhaust boat 13 are also formed. In the sub-cylinder assembly 3, the sub-cylinder 14 is formed below the scavenging passage IO, and the sub-piston 15 is connected to the crankshaft 4 via a connecting rod 16 and a crank pin 17. In this sub-cylinder assembly 3, the pressure chamber 18 is opened to the scavenging passage 10,
Also, the sub piston 15 is 18 mm relative to the main piston 7.
It is attached to the crankshaft 4 with a crank angle opening of 0 degrees.

したがって、この２サイクルエンジン１では、メインピ
ストン７の上昇（吸入・圧縮行程）に伴って吸気ボート
１２から混合気がクランク室９へ吸入される。その際、
サブピストン１５は、メインピストン７の運動に同期し
て下降し、その圧力室１８内圧クランク室９を経た混合
気を取入れる（第１図参照）０次いで、メインピストン
７が下降（爆発・掃気行程）シ、クランク室１８が圧縮
されると、該クランク室内の混合気は、掃気通路１０を
経て燃焼室１１へ圧送されるが、同時にサブピストン１
５が上昇し、その圧力室１８内の混合気を掃気通路１ｏ
へ吐出させる（第２区８照）。Therefore, in this two-stroke engine 1, the air-fuel mixture is sucked into the crank chamber 9 from the intake boat 12 as the main piston 7 rises (intake/compression stroke). that time,
The sub-piston 15 descends in synchronization with the movement of the main piston 7, and takes in the air-fuel mixture that has passed through the internal pressure crank chamber 9 (see Figure 1). Stroke) When the crank chamber 18 is compressed, the air-fuel mixture in the crank chamber is sent under pressure to the combustion chamber 11 through the scavenging passage 10, but at the same time, the sub-piston 1
5 rises and transfers the air-fuel mixture in the pressure chamber 18 to the scavenging passage 1o.
(Section 8 of Section 2).

上記作用からも明らかなように、この２サイクルエンジ
ン１では、掃気通路１０を含むクランク室９の容積か、
メインピストン７の下降に加えサブピストン１５の上昇
によって縮少され、クランク室９の一次圧力を高めたの
と実質的に同一の効果がイ０られる。As is clear from the above action, in this two-stroke engine 1, the volume of the crank chamber 9 including the scavenging passage 10 is
This is reduced by the rise of the sub-piston 15 in addition to the fall of the main piston 7, and substantially the same effect as that of increasing the primary pressure of the crank chamber 9 is eliminated.

なお、上Ｈ＋シ実施例では、サブピストン１５をコネク
ティングロッド１６、クランクピン１７な介して直接ク
ランクシャフト４に連結させているが、このサブピスト
ン１５をクランクシャツ）４に配設したカム等によって
動作させるなど、このサブピストン１５を他の動伝達手
段によって、クランクシャフト４０回転に同期させても
よい。In the upper H+C embodiment, the sub-piston 15 is directly connected to the crankshaft 4 via the connecting rod 16 and the crank pin 17, but the sub-piston 15 is connected to the crankshaft 4 by a cam or the like disposed on the crank shirt 4. The sub-piston 15 may be synchronized with the 40 revolutions of the crankshaft by other dynamic transmission means, such as by operating the sub-piston 15.

〔発明の効果〕〔Effect of the invention〕

上記したように１本発明に係る２サイクルエンジンでは
、サブシリンダアンセンブリを付設することＫよって、
クランク室の一次圧力を実質的に高めるようにしている
ので、エンジンの掃気効率をより向上させることができ
る。As described above, in the two-stroke engine according to the present invention, by attaching the sub-cylinder assembly,
Since the primary pressure in the crank chamber is substantially increased, the scavenging efficiency of the engine can be further improved.

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

第１図は本発明に係る２サイクルエンジンの吸入行程を
示した概念的縦断＋ｉｒ図、第２図はその掃気行程を示
した概念的縦断面口である。 １・・・２サイクルエンジン、２・・・メインシリンダ
アッセンブリ、３・・・サブシリンダアッセンブリ、４
・・・クランクシャフト、７・・・メインピストン、８
・・・メインシリンダ、９・・・クランク室、１０・・
・掃気通路、１１・・・燃焼室、１４・・・サブシリン
ダ、１５・・・サブピストン、１８・・・圧力室。FIG. 1 is a conceptual vertical +IR diagram showing the intake stroke of a two-stroke engine according to the present invention, and FIG. 2 is a conceptual vertical cross-sectional view showing the scavenging stroke. 1...2-cycle engine, 2...Main cylinder assembly, 3...Sub cylinder assembly, 4
...Crankshaft, 7...Main piston, 8
...Main cylinder, 9...Crank chamber, 10...
・Scavenging passage, 11... Combustion chamber, 14... Sub cylinder, 15... Sub piston, 18... Pressure chamber.

Claims (1)

【特許請求の範囲】 （１ン　サブシリンダアッセンブリの圧力室を掃気通路
に臨ませるとともに、上記サブシリンダアッセンブリの
サブピストンの運動をメインシリンダアッセンブリのメ
インピストンの運動に同期させ、上記メインシリンダア
ッセンブリの吸入行程において、上記サブピストンを後
退させて、その上記圧力室に混合気を吸入させ、その混
合気を上記メインシリンダアッセンブリの掃気行程にお
いて、上記サブピストンを前進させて上記掃気通路に吐
出させ、もってクランク室の一次圧力を実質的に高くす
るよう圧したことを％徴とする２サイクルエンジン （２）　上記サブピストンを上記メインピストンのクラ
ンクシャフトに取付けたことを特徴とする特許請求の範
囲第＋１）項記載の２サイクルエンジン。[Claims] (1) The pressure chamber of the sub-cylinder assembly is made to face the scavenging passage, and the movement of the sub-piston of the sub-cylinder assembly is synchronized with the movement of the main piston of the main cylinder assembly. In a suction stroke, the sub-piston is retreated to draw an air-fuel mixture into the pressure chamber, and in a scavenging stroke of the main cylinder assembly, the sub-piston is moved forward to discharge the air-fuel mixture into the scavenging passage. A two-cycle engine (2) characterized in that the sub-piston is attached to the crankshaft of the main piston. 2-stroke engine described in item +1).
JP771384A 1984-01-19 1984-01-19 Two cycle engine Pending JPS60150426A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP771384A JPS60150426A (en) 1984-01-19 1984-01-19 Two cycle engine

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP771384A JPS60150426A (en) 1984-01-19 1984-01-19 Two cycle engine

Publications (1)

Publication Number Publication Date
JPS60150426A true JPS60150426A (en) 1985-08-08

Family

ID=11673379

Family Applications (1)

Application Number Title Priority Date Filing Date
JP771384A Pending JPS60150426A (en) 1984-01-19 1984-01-19 Two cycle engine

Country Status (1)

Country Link
JP (1) JPS60150426A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2520502A (en) * 2013-11-20 2015-05-27 Jon Otegui Van Leeuw Efficient 2-stroke engine

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2520502A (en) * 2013-11-20 2015-05-27 Jon Otegui Van Leeuw Efficient 2-stroke engine

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