JPS63227921A - Exhaust timing control device for two-cycle engine - Google Patents

Exhaust timing control device for two-cycle engine

Info

Publication number
JPS63227921A
JPS63227921A JP22779787A JP22779787A JPS63227921A JP S63227921 A JPS63227921 A JP S63227921A JP 22779787 A JP22779787 A JP 22779787A JP 22779787 A JP22779787 A JP 22779787A JP S63227921 A JPS63227921 A JP S63227921A
Authority
JP
Japan
Prior art keywords
valve body
cylinder
exhaust
exhaust port
hole
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
JP22779787A
Other languages
Japanese (ja)
Other versions
JPH0357286B2 (en
Inventor
Shoichi Shiobara
塩原 正一
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.)
Yamaha Motor Co Ltd
Original Assignee
Yamaha 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 Yamaha Motor Co Ltd filed Critical Yamaha Motor Co Ltd
Priority to JP22779787A priority Critical patent/JPS63227921A/en
Publication of JPS63227921A publication Critical patent/JPS63227921A/en
Publication of JPH0357286B2 publication Critical patent/JPH0357286B2/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
    • 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

  • Valve-Gear Or Valve Arrangements (AREA)

Abstract

PURPOSE:To obtain a continuous change of exhaust timing by forming a valve body accommodating hole in a diagonal direction with respect to the cylinder axis when a valve body, which functions as an upper brim of an exhaust port, is installed onto the top surface of an exhaust passage, whose exhaust port is opened to the inner peripheral surface of a cylinder, in the vicinity of the exhaust port. CONSTITUTION:An air intaking passage 28 and an exhaust passage 30 are formed on a side surface of the main body 10 of a two-cycle cylinder, and the exhaust passage 30 is opened to a combustion chamber 18 via an exhaust port 34. A plate-shaped valve body 38 is arranged in the vicinity of the exhaust port 34 in such a manner that the valve body 38 functions as an upper brim of this exhaust port 34. In this case, a hole 36, in which the valve body 38 is accommodated in a freely slidable manner, is made in such a manner that the hole 36 is inclined with respect to the cylinder axis. The sectional form of this hole 36 is shaped into a slendar, oval form, while the sectional form of the valve body 38 is shaped into an oval form in correspondence to the shape of the hole 36. In addition, the tip part 40 of the valve body 38 is shaped into a slightly bent, recessed form. By changing the position of this valve body 38, the position of the upper brim part of the exhaust port can be changed, so that the exhaust timing is changed.

Description

【発明の詳細な説明】 本発明は2サイクルエンジンの排気時期制御装置に係わ
シ、特にシリンダ内周面に開口する排気口と有する排気
通路の該排気口近傍上面に排気口の上級として機能する
弁体を設けた2サイクルエンジンの排気時期制御装置に
関する。
DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an exhaust timing control device for a two-stroke engine, and particularly relates to an exhaust timing control device for a two-stroke engine, and particularly to an exhaust passage having an exhaust port opening on the inner circumferential surface of a cylinder, and functioning as an upper level of the exhaust port on the upper surface near the exhaust port. The present invention relates to an exhaust timing control device for a two-stroke engine that is provided with a valve body that does this.

従来の排気時期制御装置は、シリンダの内周面に開口す
る排気通路のシリンダヘッド側縁部に回転型の弁体を設
けたものであった。前記弁体は、その局面がシリンダの
内周面に沿うように鼓形をなし、且これを軸方向に沿っ
て半割にした形状をなしている。前記弁体は排気通路の
シリンダヘッド側縁部に形成された凹部内にその回転軸
方向がシリンダの軸方向と直交するように回転自在に設
けられている。前記弁体を回動させることによシシリン
ダの内面側に対向する局面の縁部が、シリンダの軸方向
に移動し、排気通路の開口高さを変えて排気時期を変更
するように構成されていた。
A conventional exhaust timing control device has a rotary valve body provided at the cylinder head side edge of an exhaust passage that opens into the inner circumferential surface of the cylinder. The valve body has an hourglass shape with its curved surface along the inner circumferential surface of the cylinder, and has a shape that is cut in half along the axial direction. The valve body is rotatably provided in a recess formed in the cylinder head side edge of the exhaust passage so that the direction of its rotation axis is orthogonal to the axial direction of the cylinder. By rotating the valve body, the edge of the curve facing the inner surface of the cylinder moves in the axial direction of the cylinder, changing the opening height of the exhaust passage and changing the exhaust timing. Ta.

しかしながら前記従来の2サイクルエンジンの排気時期
制御装置は弁体が鼓形をしていることから弁体の両端の
径が中間部の径に比べて極めて大きくなり、従って弁体
自体大型化の傾向をまぬがれ得なかった。その結果前記
弁体を収容する凹部もこれに対応して大きくなり、その
分シリンダ本体の肉が削ずられ強度的に不利となる。特
に弁体とシリンダ内周面とで挾まれたシリンダ本体の肉
厚は弁体が回転形ということもあシ薄肉となってしまい
やはり強度的に不利となる0以上のことからシリンダが
熱変形等を生じる虞れがあった。また前記従来の2サイ
クルエンジンの排気時期制御装置は、弁体の回転軸がシ
リンダの軸方向と直交するように配置されており弁体を
シリンダ本体の収容部に組付けるに際しては鼓形の中央
部で左右に分割された弁体をシリンダ側方からシリンダ
の軸方向と直交する方向に挿入している。従って多気筒
エンジンの場合には、弁体の挿入組付けに際して隣シの
気筒が邪魔にならぬよう各気筒別体にせざるを得ず多気
筒一体シリンダを採用することができない欠点があった
However, since the conventional exhaust timing control device for two-stroke engines has a valve body that is drum-shaped, the diameter at both ends of the valve body is extremely large compared to the diameter at the middle part, and therefore the valve body itself tends to become larger. I couldn't escape it. As a result, the recess for accommodating the valve body becomes correspondingly large, and the thickness of the cylinder body is reduced accordingly, which is disadvantageous in terms of strength. In particular, the wall thickness of the cylinder body sandwiched between the valve body and the inner peripheral surface of the cylinder is thin due to the fact that the valve body is a rotating type, and the cylinder is thermally deformed due to the fact that the thickness is more than 0, which is disadvantageous in terms of strength. There was a risk that this would occur. In addition, in the conventional exhaust timing control device for a two-stroke engine, the rotation axis of the valve body is arranged so as to be orthogonal to the axial direction of the cylinder, and when the valve body is assembled into the accommodating portion of the cylinder body, the valve body is placed in the center of the drum shape. A valve body divided into left and right parts is inserted from the side of the cylinder in a direction perpendicular to the axial direction of the cylinder. Therefore, in the case of a multi-cylinder engine, each cylinder must be separated so that adjacent cylinders do not get in the way when inserting and assembling the valve body, and a multi-cylinder integrated cylinder cannot be used.

本発明は、シリンダボディに薄肉部分が無く熱応力九対
して変形せず且組付けが容易で多気筒一体シリンダが可
能な2サイクルエンジンの排気時期制御装置を提供する
ことを目的とする。本発明はシリンダの排気通路の排気
口近傍上面にシリンダの軸線に対して傾斜した断面が細
長状の孔を形成し、この孔の中に排気口の上縁として機
能する弁体を摺動自在に配置し、前記弁体は高速運転中
前記孔内に避退して弁体の先端部が排気通路の内壁面と
略一致することを特徴とする。
SUMMARY OF THE INVENTION An object of the present invention is to provide an exhaust timing control device for a two-stroke engine that has no thin wall portion in the cylinder body, does not deform under thermal stress, is easy to assemble, and is capable of forming a multi-cylinder integrated cylinder. In the present invention, a hole is formed in the upper surface of the exhaust passage of the cylinder near the exhaust port, and the cross section is oblique with respect to the axis of the cylinder. The valve body is arranged in the exhaust passage, and the valve body is retracted into the hole during high-speed operation so that the tip of the valve body substantially coincides with the inner wall surface of the exhaust passage.

以下添付図面に従って本発明に係わる2サイクルエンジ
ンの排気時期制御装置の好ましい実施例を詳説する。
DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of an exhaust timing control device for a two-stroke engine according to the present invention will be described in detail below with reference to the accompanying drawings.

第1図はシリンダの内部構造が示されている断面図であ
る。第1図に於いて10はシリンダ本体で、シリンダ本
体10の上部にはシリンダヘッド12が取付けられ、ま
たシリンダ本体10の下部にはクランクケース14が取
付けられている。更にシリンダ本体10の内部にはピス
トン16が摺動自在に配置されておシ、シリンダヘッド
12の下面の一部、シリンダ本体lOの内周面、並びに
ピストン16の上面によって燃焼室18が形成される。
FIG. 1 is a sectional view showing the internal structure of the cylinder. In FIG. 1, numeral 10 is a cylinder body, a cylinder head 12 is attached to the upper part of the cylinder body 10, and a crank case 14 is attached to the lower part of the cylinder body 10. Furthermore, a piston 16 is slidably disposed inside the cylinder body 10, and a combustion chamber 18 is formed by a portion of the lower surface of the cylinder head 12, the inner peripheral surface of the cylinder body 1O, and the upper surface of the piston 16. Ru.

20,22A、22Bはシリンダ本体10並びにシリン
ダヘッド12に形成された冷却水ジャケットを示し、冷
却水ジャケット22Aと冷却水ジャケット22Bとは連
通して共通の冷却水ジャケットを形成する。冷却水ジャ
ケット20゜22A、22Bは連結管24を介して図示
しない水ポンプ、ラジェータ等に連通されており、これ
により冷却水が循環される°ようになっている。冷却水
ジャケット20.22人、22Bは第1図ではその一部
のみが示されており、第2図に示すように冷却水ジャケ
ラ)22Bは全周にわたって設けられる。なお第2図は
シリンダ本体10の上面からシリンダヘッド12を取り
除いてシリンダ本体10を上面から見た平面図である。
Reference numerals 20, 22A, and 22B indicate cooling water jackets formed on the cylinder body 10 and the cylinder head 12, and the cooling water jacket 22A and the cooling water jacket 22B communicate with each other to form a common cooling water jacket. The cooling water jackets 20, 22A, 22B are connected to a water pump, a radiator, etc. (not shown) via a connecting pipe 24, so that the cooling water is circulated therethrough. Only a portion of the cooling water jacket 20, 22B is shown in FIG. 1, and as shown in FIG. 2, the cooling water jacket 22B is provided over the entire circumference. Note that FIG. 2 is a plan view of the cylinder body 10 viewed from above with the cylinder head 12 removed from the top surface of the cylinder body 10. As shown in FIG.

第1図に於いて示すようにシリンダヘッド12の中央部
には点火プラグ26が装着されておシ、更にシリンダ本
体10の側面には吸気通路28並びに排気通路30が形
成されている。吸気通路28には吸気口32が形成され
て吸気行程にはここからクランクケース内へ混合気が供
給される。更に排気通路30には排気口34が形成され
て燃焼室18に開口している。またシリンダ本体10の
側面には第1図に示すように掃気口35.35が形成さ
れており、この掃気口35は図示しない掃気通路によっ
てクランクケース14内と連通されている。
As shown in FIG. 1, a spark plug 26 is attached to the center of the cylinder head 12, and an intake passage 28 and an exhaust passage 30 are formed on the side surface of the cylinder body 10. An intake port 32 is formed in the intake passage 28, from which air-fuel mixture is supplied into the crankcase during the intake stroke. Furthermore, an exhaust port 34 is formed in the exhaust passage 30 and opens into the combustion chamber 18 . Further, as shown in FIG. 1, scavenging ports 35 and 35 are formed on the side surface of the cylinder body 10, and the scavenging ports 35 communicate with the inside of the crankcase 14 through a scavenging passage (not shown).

第1図に於いて示されるようにシリンダ本体10の排気
口34近傍には後述する弁体が摺動自在に配置される孔
36がシリンダの軸線に対して55゜の傾斜をなして穿
設されている。孔36は第2図に並びに第3図にその形
状が示されているように断面が細長の長円形状に形成さ
れている。なお第3図は後述する弁体並びにカバーを取
り去シシリンダ本体に穿設された孔36の上面から見た
平面図である。長円形状の孔36には第1図並びに第2
図に示すように板状の弁体38が摺動自在に挿入されて
いる。弁体38の断面形状は図示しないがこの弁体38
が挿入される孔36の形状に列応して長円形状にその断
面が形成されている。第4図は第1図に於いて入方向か
ら見たシリンダ内周面の図面で、弁体38の先端部40
の形状が示されている。即ち先端部40はやや彎曲させ
た凹部形状に形成されておシ、この先端部40はシリン
ダ本体10の内周面の円弧形状と略一致すると共に排気
通路30の上縁部の形状と略一致するように形成されて
いる。従って弁体38の先端部40は、第1図並びに第
4図に示すように孔36内で最も避退した位置に於いて
は実線で示されるように位置し排気通路30の上縁部の
一部を形成し、また弁体38の先端部40は最も突出し
た位置に於いては図の2点鎖線で示されるようにシリン
ダの円形形状の一部を形成する。このように弁体38は
孔36内に於いてその位置を変え、排気口34の上縁部
の位置を実質的に変化させ、その結果排気時期のタイミ
ングを変化させることができる。
As shown in FIG. 1, a hole 36 in which a valve body (described later) is slidably disposed is bored in the vicinity of the exhaust port 34 of the cylinder body 10 at an angle of 55° with respect to the axis of the cylinder. has been done. The hole 36 has an elongated oval cross section, as shown in FIGS. 2 and 3. Note that FIG. 3 is a plan view of a hole 36 drilled in the cylinder body, as seen from above, with the valve body and cover, which will be described later, removed. The oblong hole 36 has holes in FIGS. 1 and 2.
As shown in the figure, a plate-shaped valve body 38 is slidably inserted. Although the cross-sectional shape of the valve body 38 is not shown, this valve body 38
Its cross section is formed into an elliptical shape corresponding to the shape of the hole 36 into which it is inserted. FIG. 4 is a drawing of the inner circumferential surface of the cylinder seen from the inlet direction in FIG.
The shape of is shown. That is, the tip 40 is formed in a slightly curved concave shape, and this tip 40 substantially matches the arc shape of the inner peripheral surface of the cylinder body 10 and also substantially matches the shape of the upper edge of the exhaust passage 30. It is formed to do so. Therefore, as shown in FIGS. 1 and 4, the tip 40 of the valve body 38 is located as shown by the solid line in the most retracted position within the hole 36, and is located at the upper edge of the exhaust passage 30. The distal end 40 of the valve body 38 forms a part of the circular shape of the cylinder at its most protruding position, as shown by the two-dot chain line in the figure. In this manner, the valve body 38 can change its position within the hole 36, thereby substantially changing the position of the upper edge of the exhaust port 34, thereby changing the timing of the exhaust timing.

弁体38の後端部には軸42が形成されておシ、この軸
42の端部はリンク機構等を介して機関速度、出力に応
じて作動する図示しないアクチュエータ等に連結される
。即ち弁体38は機関速度、出力に応じて摺動し、高速
運転時に於いては第1図並びに第4図に示すように孔3
6内に最も避退した位置に位置し、排気口34の開放時
期を早くし、高速運転から低速運転にいくに従い弁体3
8は孔36から排気通路30内に突出し、実質的に排気
034の開放時期を遅らせるように機能する。
A shaft 42 is formed at the rear end of the valve body 38, and the end of the shaft 42 is connected via a link mechanism or the like to an actuator (not shown) that operates according to engine speed and output. That is, the valve body 38 slides according to the engine speed and output, and during high-speed operation, the hole 3 is closed as shown in FIGS. 1 and 4.
The valve element 3 is located at the most retracted position within the valve body 6, and the opening timing of the exhaust port 34 is made earlier, and the valve body 3
8 projects into the exhaust passage 30 from the hole 36 and functions to substantially delay the opening timing of the exhaust 034.

なお孔36の上面にはシール44並びにカバー46が装
着されて機密性を保つようになっている。
Note that a seal 44 and a cover 46 are attached to the upper surface of the hole 36 to maintain confidentiality.

シリンダ本体10、シリンダヘッド12並びにクランク
ケース14は第1図に示されているようにクランクケー
スに植設されたスタッドボルト48によって連結される
。従来の鼓形の弁体を採用したものにあっては弁体がシ
リンダ本体を横方向に貫通しているためシリンダヘッド
、シリンダ本体、クランクケースを一本の通しボルトで
連結することができずシリンダヘッドとシリンダ本体、
シリンダ本体とクランクケースをそれぞれ別々のボルト
で連結していたが本実施例では横方向にスペースを取ら
ずスタッドボルト48は、その通し孔50が第2図に示
されるように弁体38の位置を外して形成することがで
きるため、シリンダ本体10゜シリンダヘッド12、並
びにクランクケース14を連結する通しボルトを採用す
ることができ、3つの部材を強固に連結する。スタッド
ボルト48の上部には第1図に示すように袋ナツト52
が締着される。
The cylinder body 10, cylinder head 12, and crankcase 14 are connected by stud bolts 48 implanted in the crankcase, as shown in FIG. With conventional valves that use a drum-shaped valve body, the valve body passes through the cylinder body laterally, making it impossible to connect the cylinder head, cylinder body, and crankcase with a single through bolt. cylinder head and cylinder body,
Although the cylinder body and the crankcase were connected using separate bolts, in this embodiment, the stud bolt 48 is positioned so that its through hole 50 is located at the position of the valve body 38, as shown in FIG. Since it can be formed by removing the cylinder head 12, a through bolt can be used to connect the cylinder body 10, the cylinder head 12, and the crankcase 14, thereby firmly connecting the three members. A cap nut 52 is attached to the top of the stud bolt 48 as shown in FIG.
is tightened.

以上の如く構成された本発明に係わる実施例の作用は次
の通りである。先ず弁体38の軸42はリンク機構等を
介して機関速度、出力に応じて作動する図示しないアク
チュエータ等に連結されているため、機関速度、出力に
応じて孔36内に於いて第1図で示す実線の位置から2
点鎖線の示す位置まで移動する。即ち高速運転時に於い
ては弁体38は実線で示すように孔36内処最も避退し
た位置にあり、排気口34の開放時期を早める。
The operation of the embodiment according to the present invention constructed as described above is as follows. First, the shaft 42 of the valve body 38 is connected to an actuator (not shown) that operates according to the engine speed and output via a link mechanism, etc. 2 from the position of the solid line shown in
Move to the position indicated by the dotted chain line. That is, during high-speed operation, the valve body 38 is at the most retracted position within the hole 36, as shown by the solid line, and the opening timing of the exhaust port 34 is brought forward.

この場合弁体38の先端部40の形状は排気通路30の
上縁部と略一致し、排気通路30の上縁部の一部を形成
する。一方、機関が低速運転に移行するにつれて、第1
図並びに第4図に於いて実線位置にあった弁体38の先
端部40は徐々に排気通路30内に突出する。弁体38
が排気通路30内に於いて2点鎖線で示す位置に向けて
突出すると、実質的に排気口34の上縁部の位置が下が
るととKなp排気時期のタイミングが下がることになる
In this case, the shape of the tip 40 of the valve body 38 substantially matches the upper edge of the exhaust passage 30 and forms a part of the upper edge of the exhaust passage 30 . On the other hand, as the engine shifts to low-speed operation, the first
The distal end portion 40 of the valve body 38, which was in the solid line position in the drawings and FIG. 4, gradually protrudes into the exhaust passage 30. Valve body 38
When the exhaust port 34 protrudes toward the position shown by the two-dot chain line in the exhaust passage 30, the upper edge of the exhaust port 34 is substantially lowered and the timing of the exhaust timing is lowered.

以上説明したように本発明に係わる2サイクルエンジン
の排気時期制御装置の実施例によれば、弁体38が板状
に形成され、従来の鼓型弁体に比べ小型に形成される。
As explained above, according to the embodiment of the exhaust timing control device for a two-stroke engine according to the present invention, the valve body 38 is formed in a plate shape, and is formed smaller than a conventional drum-shaped valve body.

従って、シリンダ10に形成される弁体38の収容部は
小さくて済み、シリンダ強度上便利である。また、本発
明に係る実施例においては弁体38は回転運動ではなく
傾斜した直線運動をするので、弁体38とシリンダ内周
面とで挾まれたシリンダ本体10の肉厚が極度に薄くな
ることはない。この結果、シリンダ本体10が熱変形す
るおそれはない。また、本発明に係る実施例では、弁体
38をシリンダ本体10の横方向から挿入、組付けるの
ではなく上方から挿入するだけであるので、組付けが容
易となる。特に多気筒エンジンの場合には隣接する気筒
に邪魔されることなく組付けることかできるので、多気
筒一体シリンダが可能となる。更に、本発明に係る実施
例ではシリンダ軸線に対し斜め方向に摺動する板状の弁
体38を用いているので、構成が簡単となり、エンジン
をコンパクトに形成することが出来る。
Therefore, the accommodating portion of the valve body 38 formed in the cylinder 10 can be small, which is convenient in terms of cylinder strength. Furthermore, in the embodiment according to the present invention, the valve body 38 does not rotate but performs an inclined linear motion, so that the wall thickness of the cylinder body 10 sandwiched between the valve body 38 and the inner circumferential surface of the cylinder becomes extremely thin. Never. As a result, there is no risk of thermal deformation of the cylinder body 10. Furthermore, in the embodiment according to the present invention, the valve body 38 is not inserted and assembled from the lateral direction of the cylinder body 10, but is only inserted from above, which facilitates assembly. Particularly in the case of a multi-cylinder engine, since it can be assembled without interference from adjacent cylinders, a multi-cylinder integrated cylinder becomes possible. Furthermore, since the embodiment according to the present invention uses a plate-shaped valve body 38 that slides obliquely with respect to the cylinder axis, the structure is simple and the engine can be made compact.

以上説明したように本発明に係わる2サイクルエンジン
の排気時期制御装置に拠れば、排気口の上級として機能
する弁体をシリンダの軸線に対して傾斜して形成された
孔内に摺動自在に配置し、高速運転中前記弁体が孔内に
避退して排気通路の内壁面と略一致するようにしている
ので、弁体の付近のシリンダの肉厚が薄くならず而も弁
体は上方から挿入することができるため多気筒一体シリ
ンダとして構成することもできる。
As explained above, according to the exhaust timing control device for a two-stroke engine according to the present invention, the valve body functioning as the upper part of the exhaust port can be slid freely into the hole formed at an angle with respect to the axis of the cylinder. During high-speed operation, the valve body retracts into the hole and is substantially aligned with the inner wall surface of the exhaust passage, so that the wall thickness of the cylinder near the valve body does not become thin and the valve body Since it can be inserted from above, it can also be configured as a multi-cylinder integral cylinder.

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

第1図は本発明に係わる実施例が適用されるシリンダの
内部構造を示す断面図、第2図は第1図に於いて示しだ
シリンダのシリンダヘッド部分を取り除いて示した平面
図、第3図は第1図に於いて示したシリンダに於いて弁
体が挿入される孔のカバーを取り除いて示した孔の形状
を示す平面図、第4図は第1図上のA矢視図である。 10・・・シリンダ本体、12・・・シリンダヘッド、
14・・・クランクケース、30・・・排気通路、34
・・・排気口、36・・・弁体が挿入される孔、38・
・・弁体、40・・・弁体の先端部。
FIG. 1 is a sectional view showing the internal structure of a cylinder to which an embodiment of the present invention is applied, FIG. 2 is a plan view of the cylinder shown in FIG. 1 with the cylinder head portion removed, and FIG. The figure is a plan view showing the shape of the hole in which the valve body is inserted in the cylinder shown in Figure 1 with the cover removed, and Figure 4 is a view taken in the direction of arrow A in Figure 1. be. 10... Cylinder body, 12... Cylinder head,
14... Crank case, 30... Exhaust passage, 34
...Exhaust port, 36... Hole into which the valve body is inserted, 38.
... Valve body, 40... Tip of the valve body.

Claims (1)

【特許請求の範囲】[Claims] シリンダ内周面に開口する排気口を有する排気通路の該
排気口近傍上面に排気口の上縁として機能する弁体を設
けた2サイクルエンジンの排気時期制御装置に於いて、
断面が細長状の孔が前記シリンダの排気通路の排気口近
傍に開口されると共にシリンダの軸線に対して傾斜して
穿設され、前記弁体が該孔内に摺動自在に配置され高速
運転中弁体が孔内に避退して弁体の先端部が前記排気通
路の内壁面と略一致することを特徴とする2サイクルエ
ンジンの排気時期制御装置。
In an exhaust timing control device for a two-cycle engine, a valve body functioning as an upper edge of the exhaust port is provided on the upper surface near the exhaust port of an exhaust passage having an exhaust port opening on the inner circumferential surface of the cylinder.
A hole having an elongated cross section is opened near the exhaust port of the exhaust passage of the cylinder and is bored at an angle with respect to the axis of the cylinder, and the valve body is slidably disposed within the hole to facilitate high-speed operation. An exhaust timing control device for a two-stroke engine, characterized in that a middle valve body is retracted into a hole so that a tip end of the valve body substantially coincides with an inner wall surface of the exhaust passage.
JP22779787A 1987-09-11 1987-09-11 Exhaust timing control device for two-cycle engine Granted JPS63227921A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP22779787A JPS63227921A (en) 1987-09-11 1987-09-11 Exhaust timing control device for two-cycle engine

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP22779787A JPS63227921A (en) 1987-09-11 1987-09-11 Exhaust timing control device for two-cycle engine

Related Parent Applications (1)

Application Number Title Priority Date Filing Date
JP17086979A Division JPS5692314A (en) 1979-12-27 1979-12-27 Exhaust timing controlling apparatus for two-cycle engine

Publications (2)

Publication Number Publication Date
JPS63227921A true JPS63227921A (en) 1988-09-22
JPH0357286B2 JPH0357286B2 (en) 1991-08-30

Family

ID=16866540

Family Applications (1)

Application Number Title Priority Date Filing Date
JP22779787A Granted JPS63227921A (en) 1987-09-11 1987-09-11 Exhaust timing control device for two-cycle engine

Country Status (1)

Country Link
JP (1) JPS63227921A (en)

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS442243Y1 (en) * 1968-01-18 1969-01-28
JPS50119117A (en) * 1974-03-06 1975-09-18
JPS5139112U (en) * 1974-09-17 1976-03-24

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS442243Y1 (en) * 1968-01-18 1969-01-28
JPS50119117A (en) * 1974-03-06 1975-09-18
JPS5139112U (en) * 1974-09-17 1976-03-24

Also Published As

Publication number Publication date
JPH0357286B2 (en) 1991-08-30

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