JPS6027729A - Crankcase reed valve type two-cycle engine - Google Patents

Crankcase reed valve type two-cycle engine

Info

Publication number
JPS6027729A
JPS6027729A JP13722883A JP13722883A JPS6027729A JP S6027729 A JPS6027729 A JP S6027729A JP 13722883 A JP13722883 A JP 13722883A JP 13722883 A JP13722883 A JP 13722883A JP S6027729 A JPS6027729 A JP S6027729A
Authority
JP
Japan
Prior art keywords
intake
piston
reed valve
cylinder
crankcase
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
JP13722883A
Other languages
Japanese (ja)
Other versions
JPH0543856B2 (en
Inventor
Toshibumi Ito
俊文 伊藤
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.)
Honda Motor Co Ltd
Original Assignee
Honda Motor Co Ltd
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 Honda Motor Co Ltd filed Critical Honda Motor Co Ltd
Priority to JP13722883A priority Critical patent/JPS6027729A/en
Publication of JPS6027729A publication Critical patent/JPS6027729A/en
Publication of JPH0543856B2 publication Critical patent/JPH0543856B2/ja
Granted legal-status Critical Current

Links

Classifications

    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02BINTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
    • F02B33/00Engines characterised by provision of pumps for charging or scavenging
    • F02B33/02Engines with reciprocating-piston pumps; Engines with crankcase pumps
    • F02B33/28Component parts, details or accessories of crankcase pumps, not provided for in, or of interest apart from, subgroups F02B33/02 - F02B33/26
    • F02B33/30Control of inlet or outlet ports
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02BINTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
    • F02B33/00Engines characterised by provision of pumps for charging or scavenging
    • F02B33/02Engines with reciprocating-piston pumps; Engines with crankcase pumps
    • F02B33/04Engines 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
    • 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)
  • Supercharger (AREA)

Abstract

PURPOSE:To raise the charging efficiency of a two-cycle engine, by employing such as arrangement that a connecting rod gives no resistance to the intake-air flow at the time of suction stroke by selecting the turning direction of a crankshaft such that a crank pin is moved on the side of an intake port at the time of expansion and scavenging strokes of a piston. CONSTITUTION:At the time of expansion and scavenging strokes of a piston 9 when the piston 9 is moved downward and a reed valve 17 at an intake port 13 is closed, the turning direction of a crankshaft 11 is so selected that a crank pin 12a is moved on the side of the intake port 13 with respect to the axis A of a cylinder 3a. By employing such an arrangement, intake-air flow is not affected at all by a connecting rod 10 when its big end 10b passes through the front of the intake port 13. Further, since drawing of intake air is started with opening of the reed valve 17 at the intake port 13 when the piston 9 begins to move upward, resistance to the intake-air flow by the big end 10b of the connecting rod 10 can be reduced.

Description

【発明の詳細な説明】 本発明は吸気効率を改善し高出力化を図ったクランクケ
ースリードバルブ型2サイクルエンジンに関する。
DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a crankcase reed valve type two-stroke engine that improves intake efficiency and achieves high output.

2サイクルエンジンにおいて吸気バルブにリードバルブ
を用いるものでは従来、シリンダ側壁に開口した吸気ボ
ートにリードバルブを備えたピストンリードバルブ型と
、クランクケース側壁に開口した吸気ボートにリードバ
ルブを備えたクランクケースリードバルブ型とがある。
Conventionally, two-stroke engines that use reed valves as intake valves include a piston reed valve type that has a reed valve on the intake boat that opens on the cylinder side wall, and a crankcase type that has a reed valve on the intake boat that opens on the crankcase side wall. There is a reed valve type.

ここでエンジンを高速回転、高出力化するためには吸気
ポートを拡大して吸気効率を高める必要があるが、ピス
トンリードバルブ型では吸気ポートを拡大するとピスト
ンの側圧を支持するシリンダの側壁の面積が減小するこ
とからピストンのスラップ音やピストンリング音を発生
し、又シリンダの歪みによるシリンダ壁の焼付きを発生
する等の不利を招き易t)。
In order to make the engine run at high speed and increase output, it is necessary to enlarge the intake port to increase intake efficiency, but with a piston reed valve type, enlarging the intake port increases the area of the side wall of the cylinder that supports the side pressure of the piston. This decreases the piston's slapping sound and piston ring sound, and tends to cause disadvantages such as cylinder wall seizure due to cylinder distortion.

クランクケースリードバルブ型では上記ビストンリード
バルブ型の不利は免かれる代りに、吸気ボートの設置ス
ペースや数句は角度に制約があることと、吸気ボートの
前面を吸気抵抗となるコンロッドの大端部が通過するこ
とから吸気効率向上が阻害されるという難点がある。
Although the crankcase reed valve type avoids the disadvantages of the piston reed valve type mentioned above, there are restrictions on the installation space and angle of the intake boat, and the large end of the connecting rod creates intake resistance at the front of the intake boat. There is a drawback that improvement in intake efficiency is hindered because the air passes through the air.

本発明はクランクケースリードバルブ型2サイクルエン
ジンの上記難点を解決し吸気効率を向上し高出力化を可
能にすることを目的とし、第1発明ではシリンダ軸線と
クランク軸線を含む面に関して同一側に吸気ボートと排
気ボー1〜を有するクランクケースリードバルブ型2サ
イクルエンジンにおいて、クランク軸の回転方向をピス
トンの膨張・掃気行程の時にクランクビンが前記吸気ボ
ート側を通過するように設定し、ピストンの吸気行程の
時コンロッドの大端部が吸気ボートの前面を通過して吸
気抵抗となるのを改善し、又第2発明では第1発明に加
え、吸気ボートと対向する側のシリンダ壁に補助掃気ボ
ートを設け、吸気ボートから吸入された吸気をクランク
軸の回転と共にコンロッドによって強制的に補助掃気ポ
ートへ送り込むようにて前記目的を達成したクランクケ
ースリードバルブ型2サイクルエンジンを提供するもの
である。
The present invention aims to solve the above-mentioned difficulties of the crankcase reed valve type two-stroke engine, improve intake efficiency, and enable high output. In a crankcase reed valve type two-stroke engine having an intake boat and an exhaust bow, the direction of rotation of the crankshaft is set so that the crank bin passes through the intake boat side during the expansion and scavenging strokes of the piston. In the second invention, in addition to the first invention, an auxiliary scavenging air is installed on the cylinder wall on the side facing the intake boat. To provide a crankcase reed valve type two-stroke engine which achieves the above object by providing an intake boat and forcibly sending intake air taken from the intake boat to an auxiliary scavenging port by a connecting rod as the crankshaft rotates.

以下本発明の実施例を図面を参照して説明する。Embodiments of the present invention will be described below with reference to the drawings.

第1図は本発明に係るクランクケースリードバルブ型2
サイクルエンジンを示し、エンジン本体1はシリンダヘ
ッド2.シリンダブロック3及び密閉されたクランクケ
ース4が順次一体に接合されて水平に設置され、クラン
クケース4には更にミッションケース5が連設されてい
る。シリンダヘッド2とシリンダブロック3内には冷却
水通路6が設けられてウォータジャケットを形成し、シ
リンダヘッド2にはシリンダ3a上部の燃焼室7に臨む
点火プラグ8が取付けられている。シリンダ3a内に嵌
スされたピストン9のピストンピン9aはコンロッド1
0の小端部10aに連結され、クランクケース4内のク
ランク軸11に取付けられたクランクウェブ12のクラ
ンクビン12aはコンロッドlOの大端部10bに連結
され、ピストン9の往復動がコンロッドlOを介してク
ランク軸11の回転に変換される。
Figure 1 shows crankcase reed valve type 2 according to the present invention.
A cycle engine is shown in which an engine body 1 has a cylinder head 2. A cylinder block 3 and a sealed crankcase 4 are successively joined together and installed horizontally, and a transmission case 5 is further connected to the crankcase 4. A cooling water passage 6 is provided in the cylinder head 2 and the cylinder block 3 to form a water jacket, and a spark plug 8 is attached to the cylinder head 2 facing the combustion chamber 7 above the cylinder 3a. The piston pin 9a of the piston 9 fitted in the cylinder 3a is connected to the connecting rod 1.
The crank pin 12a of the crank web 12, which is connected to the small end 10a of the connecting rod 10 and attached to the crankshaft 11 in the crankcase 4, is connected to the large end 10b of the connecting rod 10, and the reciprocating motion of the piston 9 causes the connecting rod 10 to The rotation is converted into rotation of the crankshaft 11 through the rotation of the crankshaft 11.

吸気ボート13はシリンダ軸線Aとクランク軸線Bを含
む面にほぼ垂直な面上において軸線Cがほぼクランク軸
11に指向すると共にシリンダ軸線Aに対して約456
反シリンダ側に傾斜されてクランクケース4に開口され
、又排気ポート14が吸気ボート13と同一側において
シリンダ3aの所定位置に開口されている。シリンダ軸
線Aとクランク軸線Bを含む面上におけるシリンダ3a
の左右の側壁にはクランクケース4とシリンダ3aの所
定位置とを連通ずる主掃気ポー1−15.15(第2図
)がシリンダ3a壁の反排気ポート側に指向されて設け
られ、又シリンダ軸線Aとクランク軸線Bを含む面上、
シリンダ軸線Aに対して吸気ボート13.排気ポート1
4と反対側のシリンダ3aの側壁にクランクケース4と
シリンダ3aの所定位置とを連通ずる補助掃気ボート1
6が設けられている。即ち上記吸気ボートt 3 、 
#ti気ボート】4.主掃気ボート】5.補助掃気ボー
トの位置関係は第2図に示すようになる。
The intake boat 13 has an axis C that is substantially oriented toward the crankshaft 11 on a plane that is substantially perpendicular to a plane that includes the cylinder axis A and the crank axis B, and is approximately 456 degrees with respect to the cylinder axis A.
It is inclined toward the opposite side of the cylinder and opens into the crankcase 4, and an exhaust port 14 is opened at a predetermined position of the cylinder 3a on the same side as the intake boat 13. Cylinder 3a on a plane including cylinder axis A and crank axis B
Main scavenging ports 1-15.15 (Fig. 2), which communicate the crankcase 4 and a predetermined position of the cylinder 3a, are provided on the left and right side walls of the cylinder 3a, and are oriented toward the opposite exhaust port side of the cylinder 3a wall. On a plane including axis A and crank axis B,
Intake boat 13. relative to cylinder axis A. Exhaust port 1
An auxiliary scavenging boat 1 communicates between the crankcase 4 and a predetermined position of the cylinder 3a on the side wall of the cylinder 3a on the opposite side of the cylinder 3a.
6 is provided. That is, the intake boat t 3 ,
#ti ki boat】4. Main scavenging boat]5. The positional relationship of the auxiliary scavenging boats is shown in Figure 2.

吸気ボート】3にはクランクケース4側に開く2連のリ
ードバルブ17が設けられ、吸気ボート13の入口は設
置スペースによってスラントキャブレタ18又はダウン
ドラフトキャブレタ18′の出口に接続され、同キャブ
レタ18又は18′の入口は図示しないエアクリーナケ
ースに接続されている。
The intake boat 3 is provided with two reed valves 17 that open toward the crankcase 4 side, and the inlet of the intake boat 13 is connected to the outlet of a slant carburetor 18 or a downdraft carburetor 18' depending on the installation space. The inlet of 18' is connected to an air cleaner case (not shown).

ここで本発明ではクランク軸11の回転方向を、ピスト
ン9の膨張・掃気行程、即ちピストン9の下動の時第1
図に矢線で示したようにクランクビン12aがシリンダ
3aの軸線Aに対して吸気ボート13側を通過するよう
に設定する。クランク軸11の回転はミッションケース
5内の歯車列を介して図示されない駆動軸に伝えられる
Here, in the present invention, the rotation direction of the crankshaft 11 is set to the first rotation direction during the expansion and scavenging stroke of the piston 9, that is, when the piston 9 moves downward.
The crank bin 12a is set so as to pass on the intake boat 13 side with respect to the axis A of the cylinder 3a, as shown by the arrow in the figure. The rotation of the crankshaft 11 is transmitted to a drive shaft (not shown) via a gear train within the mission case 5.

上記構成のクランクケースリードバルブ型2サイクルエ
ンジンにおいて、ピストン9が上動し図示の上死点付近
に達すると点火プラグ8の点火が行われ、シリンダ3a
内に圧縮された混合気に着火されピストン9は膨張行程
に移り下動を始める。
In the crankcase reed valve type two-stroke engine configured as described above, when the piston 9 moves upward and reaches near the top dead center shown in the figure, the spark plug 8 is ignited, and the cylinder 3a
The air-fuel mixture compressed inside is ignited, and the piston 9 moves into an expansion stroke and begins to move downward.

ピストン9が下動を始めると前行程でクランクケース4
内に吸入さ九でいた混合気の圧力が上昇するため吸気ポ
ー1〜13のリート弁17は閉じてクランクケース4は
密閉され、クランクケース4内の混合気は圧縮され始め
る。ピストン9が下動してシリンダ3a上部の燃焼室7
と排気ポート14とを連通ずると高圧の燃焼ガスは排気
ポー1へ14より排出し始め、ピストン9が更に下動し
て主掃気ポーh15,15及び補助掃気ボート16を開
くと、クランクケース4内に圧縮された混合気は上記掃
気ボート15,15.16よりシリンダ3a内に送り込
まれ、シリンダ3a内に残っている燃焼ガスを排気ポー
ト14より追い出し掃気行程となる。この掃気行程でシ
リンダ3a壁の反排気ボート側に指向された主掃気ボー
ト15.15からシリンダ3a内に送り込まれた混合気
は排気ポー1−14方向へ向く補助掃気ポート16から
送り込まれる混合気によって排気ポート14の方向に誘
導され、燃焼ガスを効率よく排気ポート14へ追い出す
作用をする。ピストン9が下死点を経て上動し主掃気ポ
ート15,15、補助掃気ポート16を閉じ、更に排気
ポート14を閉じると掃気・排気は終了し、シリンダ3
aは密閉されて混合気はピストン9の上動に伴って圧縮
され圧縮行程となり、一方クランクケース4内の圧力が
減小して吸気ボート13のリードバルブ17が開き混合
気がクランクケース4内に吸入され、以下同様のサイク
ルが繰り返される。
When the piston 9 begins to move downward, the crankcase 4
Since the pressure of the air-fuel mixture sucked into the engine increases, the riet valves 17 of the intake ports 1 to 13 are closed, the crankcase 4 is sealed, and the air-fuel mixture in the crankcase 4 begins to be compressed. The piston 9 moves downward and the combustion chamber 7 in the upper part of the cylinder 3a
When the piston 9 is moved further down and the main scavenging ports h15, 15 and the auxiliary scavenging port 16 are opened, the high pressure combustion gas starts to be discharged from the exhaust port 1 to the exhaust port 14. The compressed air-fuel mixture is sent into the cylinder 3a from the scavenging boats 15, 15, 16, and the combustion gas remaining in the cylinder 3a is expelled from the exhaust port 14, resulting in a scavenging stroke. In this scavenging stroke, the air-fuel mixture is fed into the cylinder 3a from the main scavenging boat 15.15 directed toward the opposite side of the exhaust boat on the wall of the cylinder 3a, and the air-fuel mixture is fed into the cylinder 3a from the auxiliary scavenging port 16 facing toward the exhaust port 1-14. The combustion gas is guided in the direction of the exhaust port 14 by the combustion gas, and has the effect of efficiently expelling the combustion gas to the exhaust port 14. When the piston 9 moves upward after passing through the bottom dead center and closes the main scavenging ports 15, 15 and the auxiliary scavenging port 16, and further closes the exhaust port 14, the scavenging and exhausting ends, and the cylinder 3
a is sealed and the air-fuel mixture is compressed as the piston 9 moves upward, resulting in a compression stroke.Meanwhile, the pressure inside the crankcase 4 decreases and the reed valve 17 of the intake boat 13 opens, allowing the air-fuel mixture to flow inside the crankcase 4. The same cycle is then repeated.

上記の作動において、クランク軸11の回転方向はビス
I・ン9の膨張・掃気行程の時、即ちピストン9が下動
し吸気ボート13のリート弁17が閉じられている時、
クランクピン12aがシリンダ3ムの軸線Aに対して吸
気ポー1へ13側を通過するように設定されているため
、コンロッド10の大端部tabが吸気ボート13の前
面を通過しても吸気には影響を与えない。次にコンロッ
ド10の大端部tabが吸気ボート13の前面を通過し
、ピストン9が上動を始めた時吸気ボート13のリード
バルブ17が開かれて吸気が始まるのでコンロッド10
の大端部10bによる吸気抵抗は低減され、更にクラン
クケース4内に吸入された混合気はクランク軸11の回
転に従いコンロッド10によって補助掃気ポート16へ
強制的に送り込まれる作用を受ける。このためクランク
ケースリードバルブ型2サイクルエンジンでありながら
吸気効率を向上することができ、高速回転、高出力化が
可能となる。
In the above operation, the direction of rotation of the crankshaft 11 is during the expansion and scavenging stroke of the screw I/N 9, that is, when the piston 9 moves downward and the riet valve 17 of the intake boat 13 is closed.
Since the crank pin 12a is set to pass through the intake port 1 to the intake port 13 side with respect to the axis A of the cylinder 3m, even if the large end tab of the connecting rod 10 passes through the front surface of the intake boat 13, the crank pin 12a is has no effect. Next, the large end tab of the connecting rod 10 passes through the front surface of the intake boat 13, and when the piston 9 begins to move upward, the reed valve 17 of the intake boat 13 is opened and intake begins, so the connecting rod 10
Intake resistance due to the large end 10b of the crankcase 4 is reduced, and the air-fuel mixture sucked into the crankcase 4 is forcibly fed into the auxiliary scavenging port 16 by the connecting rod 10 as the crankshaft 11 rotates. Therefore, even though it is a crankcase reed valve type two-stroke engine, intake efficiency can be improved, and high speed rotation and high output are possible.

第3図は、第4図に示すシリンダ3aの軸線Aに対しリ
ードバルブ17を取(=1けた吸気ボート13の軸線C
を906に配した実験装置によってクランク角度θを0
°から3Go6まで15°毎に順次固定していき、各ク
ランク角度において一定圧力でシリンダ3a内に空気を
吸入した時の吸入空気流量を実測して示したグラフで、
ピストン9のコンロッド10が吸気ボート13の前面を
通過するクランク角度90°の前後の範囲でコンロッド
10の抵抗で吸入空気流量が低下し、その逆側のクラン
ク角度270°の前後の範囲でコンロッド10の抵抗が
減小して吸入空気流量が増大することが示されている。
FIG. 3 shows the reed valve 17 with respect to the axis A of the cylinder 3a shown in FIG.
The crank angle θ was set to 0 using an experimental device with
This is a graph showing the actual measurement of the intake air flow rate when air is sucked into the cylinder 3a at a constant pressure at each crank angle by fixing it in steps of 15 degrees from ° to 3Go6.
In the range around the crank angle of 90° where the connecting rod 10 of the piston 9 passes the front surface of the intake boat 13, the intake air flow rate decreases due to the resistance of the connecting rod 10, and in the range around the crank angle of 270° on the opposite side, the connecting rod 10 It has been shown that the intake air flow rate is increased by decreasing the resistance of the air.

そしてクランク角度が約0゜から180″の間はリード
バルブ17が閉じて吸 4気されない位相であり、クラ
ンク角度が約1806から300°までの間が吸気の位
相であるから。
When the crank angle is between about 0° and 180°, the reed valve 17 is closed and no intake air is produced, and when the crank angle is between about 1806° and 300°, it is the intake phase.

本発明のようにコンロッド10が吸気ボート13の反対
側にある時を吸気行程とするようなりランク軸の回転方
向とすることによって吸気効率が向上することが証明さ
れる。
It has been proven that the intake efficiency is improved by setting the intake stroke to be the time when the connecting rod 10 is on the opposite side of the intake boat 13, such that the direction of rotation of the rank shaft is the same as in the present invention.

以上説明したように本発明によれば、クランクケースリ
ードバルブ型2サイクルエンジンにおいて、クランク軸
の回転方向をピストンの膨張・掃気行程の時にクランク
ピンが吸気ポー1〜側を通過するように設定し、又これ
に加え、吸気ボートと対向する側のシリンダ壁に補助掃
気ポートを設けたことにより、ピストンの吸気行程の時
コンロッドが吸気抵抗とならず、又クランク軸の回転と
共にコンロッドによって吸気が強制的に補助掃気ポート
へ送り込まれ、クランクケースリードバルブ型2サイク
ルエンジンでありながら吸気効率を向上することができ
、高速回転、高出力化が可能となる。
As explained above, according to the present invention, in a crankcase reed valve type two-stroke engine, the direction of rotation of the crankshaft is set so that the crank pin passes through the intake port 1 side during the expansion and scavenging strokes of the piston. In addition to this, by providing an auxiliary scavenging port on the cylinder wall on the side facing the intake boat, the connecting rod does not create intake resistance during the intake stroke of the piston, and the intake air is forced by the connecting rod as the crankshaft rotates. The intake air is sent to the auxiliary scavenging port, which improves intake efficiency even though it is a crankcase reed valve type two-stroke engine, making it possible to achieve high speed rotation and high output.

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

図面は本発明の実施例を示し、第1図は本発明に係るク
ランクケースリードバルブ型2サイクルエンジンの垂直
縦断面図、第2図は第1図の■−■線矢視断面図、第3
図はクランク角度と吸入ポートよりの吸入空気流量との
関係を実測して示したグラフ、第4図はその実験装置の
概略図である。 1・・・エンジン本体、4・・・クランクケース、9・
・・ピストン、11・・・クランク軸、L2a・・・ク
ランクピン、 13・・・吸気ポート、14・・・排気
ポート、16・・・補助掃気ポート、17・・・リード
バルブ、A・・・シリンダ軸線、B・・・クランク軸線
。 出願人 本田技研工業株式会社 代理人 弁理士 渡部敏彦
The drawings show embodiments of the present invention, and FIG. 1 is a vertical cross-sectional view of a crankcase reed valve type two-cycle engine according to the present invention, and FIG. 2 is a cross-sectional view taken along the line ■-■ in FIG. 3
The figure is a graph showing an actually measured relationship between the crank angle and the intake air flow rate from the intake port, and FIG. 4 is a schematic diagram of the experimental apparatus. 1...Engine body, 4...Crank case, 9.
... Piston, 11... Crankshaft, L2a... Crank pin, 13... Intake port, 14... Exhaust port, 16... Auxiliary scavenging port, 17... Reed valve, A...・Cylinder axis, B...Crank axis. Applicant Honda Motor Co., Ltd. Agent Patent Attorney Toshihiko Watanabe

Claims (1)

【特許請求の範囲】 1、 シリンダ軸線とクランク軸線を含む面に関して同
一側に吸気ボー1−と排気ポートを有するクランクケー
スリードバルブ型2サイクルエンジンにおいて、クラン
ク軸の回転方向をピストンの膨張・掃気行程の時にクラ
ンクピンが前記吸気ボート側を通過するように設定した
ことを特徴とするクランクケースリードバルブ型2サイ
クルエンジン。 2、 シリンダ軸線とクランク軸線を含む面に関して同
一側に吸気ポートと排気ポートを有するクランクケース
リードバルブ型2サイクルエンジンにおいて、クランク
軸の回転方向をピストンの膨張・掃気行程の時にクラン
クピンが前記吸気ボート側を通過するように設定すると
共に、前記吸気ボートと対向する側のシリンダ壁に補助
掃気ポートを設けたことを特徴とするクランクケースリ
ードバルブ型2サイクルエンジン。
[Claims] 1. In a crankcase reed valve type two-stroke engine that has an intake port and an exhaust port on the same side with respect to a plane containing the cylinder axis and the crank axis, the direction of rotation of the crankshaft is aligned with the expansion and scavenging of the piston. A crankcase reed valve type two-stroke engine, characterized in that a crank pin is set to pass through the intake boat side during a stroke. 2. In a crankcase reed valve type two-stroke engine that has an intake port and an exhaust port on the same side with respect to the plane containing the cylinder axis and the crank axis, the crank pin rotates in the direction of rotation of the crankshaft during the expansion and scavenging strokes of the piston. 1. A crankcase reed valve type two-stroke engine, characterized in that the intake air is set to pass through the boat side, and an auxiliary scavenging port is provided on the cylinder wall on the side facing the intake boat.
JP13722883A 1983-07-27 1983-07-27 Crankcase reed valve type two-cycle engine Granted JPS6027729A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP13722883A JPS6027729A (en) 1983-07-27 1983-07-27 Crankcase reed valve type two-cycle engine

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP13722883A JPS6027729A (en) 1983-07-27 1983-07-27 Crankcase reed valve type two-cycle engine

Publications (2)

Publication Number Publication Date
JPS6027729A true JPS6027729A (en) 1985-02-12
JPH0543856B2 JPH0543856B2 (en) 1993-07-02

Family

ID=15193772

Family Applications (1)

Application Number Title Priority Date Filing Date
JP13722883A Granted JPS6027729A (en) 1983-07-27 1983-07-27 Crankcase reed valve type two-cycle engine

Country Status (1)

Country Link
JP (1) JPS6027729A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0525546A (en) * 1991-07-18 1993-02-02 Nippon Steel Corp Production of shaft-shaped machine parts having high torsional strength

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH075352U (en) * 1993-06-25 1995-01-27 シライ総業株式会社 Aquarium

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5285805U (en) * 1975-12-23 1977-06-27
JPS5381708U (en) * 1976-12-09 1978-07-06
JPS55117031A (en) * 1979-03-03 1980-09-09 Nippon Soken Inc Crank chamber compressed type two-cycle internal combustion engine

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5285805U (en) * 1975-12-23 1977-06-27
JPS5381708U (en) * 1976-12-09 1978-07-06
JPS55117031A (en) * 1979-03-03 1980-09-09 Nippon Soken Inc Crank chamber compressed type two-cycle internal combustion engine

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0525546A (en) * 1991-07-18 1993-02-02 Nippon Steel Corp Production of shaft-shaped machine parts having high torsional strength

Also Published As

Publication number Publication date
JPH0543856B2 (en) 1993-07-02

Similar Documents

Publication Publication Date Title
US5076220A (en) Internal combustion engine
JPH02207131A (en) Valve driving mechanism for two-cycle multi-cylinder engine
EP0787252B1 (en) A dual piston internal combustion engine
US4577597A (en) Method and apparatus for supplying fuel to internal combustion engine
US3808807A (en) Tuning arrangement for outboard motor
US4598673A (en) Air-scavenged two-cycle internal combustion engine
US4276858A (en) Two-cycle internal combustion engine
JPH02204625A (en) Two-cycle engine
EP0767294B1 (en) Internal combustion engine
US4194470A (en) Two-cycle internal combustion engine having boost port
JPS6027729A (en) Crankcase reed valve type two-cycle engine
CZ11995A3 (en) Internal combustion engine
JP3261328B2 (en) Variable cycle internal combustion engine
JPH1018842A (en) Exhaust controller for spark ignition type 2-stroke internal combustion engine
US10914205B2 (en) Rotational valve for two stroke engine
EP0065988A1 (en) Internal combustion engine
JPS6235024A (en) Two-cycle engine
JP3187650B2 (en) Two-stroke cycle engine
JPS6088810A (en) Internal-combustion engine
JP2754050B2 (en) Exhaust silencer for two-cycle engine
JPS6214324Y2 (en)
JPH09189229A (en) Scavenging method of two cycle engine and two cycle engine using the method
RU2061885C1 (en) Piston for two-stroke internal combustion engine
JPS6311288Y2 (en)
JPS5842578Y2 (en) Air supply system for two-stroke internal combustion engine