JPH05256138A - Two-cycle engine - Google Patents
Two-cycle engineInfo
- Publication number
- JPH05256138A JPH05256138A JP8930892A JP8930892A JPH05256138A JP H05256138 A JPH05256138 A JP H05256138A JP 8930892 A JP8930892 A JP 8930892A JP 8930892 A JP8930892 A JP 8930892A JP H05256138 A JPH05256138 A JP H05256138A
- Authority
- JP
- Japan
- Prior art keywords
- hole
- scavenging
- passage
- air
- exhaust
- 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.)
- Withdrawn
Links
- 230000002000 scavenging effect Effects 0.000 claims abstract description 81
- 238000004891 communication Methods 0.000 claims abstract description 15
- 235000014676 Phragmites communis Nutrition 0.000 claims abstract description 10
- 239000000446 fuel Substances 0.000 abstract description 23
- 239000000203 mixture Substances 0.000 abstract description 22
- 238000000746 purification Methods 0.000 abstract 1
- 238000010586 diagram Methods 0.000 description 4
- 238000002485 combustion reaction Methods 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000005192 partition Methods 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02F—CYLINDERS, PISTONS OR CASINGS, FOR COMBUSTION ENGINES; ARRANGEMENTS OF SEALINGS IN COMBUSTION ENGINES
- F02F1/00—Cylinders; Cylinder heads
- F02F1/18—Other cylinders
- F02F1/22—Other cylinders characterised by having ports in cylinder wall for scavenging or charging
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02F—CYLINDERS, PISTONS OR CASINGS, FOR COMBUSTION ENGINES; ARRANGEMENTS OF SEALINGS IN COMBUSTION ENGINES
- F02F3/00—Pistons
- F02F3/24—Pistons having means for guiding gases in cylinders, e.g. for guiding scavenging charge in two-stroke engines
-
- 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
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Cylinder Crankcases Of Internal Combustion Engines (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明はクランクケース圧縮式２
サイクルエンジンの吸気排気通路に関する。BACKGROUND OF THE INVENTION The present invention relates to a crankcase compression type 2
Intake and exhaust passage of a cycle engine.
【０００２】[0002]
【従来の技術】従来の技術の例を図７〜９によって説明
する。図７はシュニーレ掃気式２サイクルガソリンエン
ジンの要部断面図、図８はシュニーレ掃気式２サイクル
ガソリンエンジンの掃気の流れを示す図、図９は図７の
VIII−VIII断面図である。図において１はシリンダ、２
はクランクケース、３はピストン、４は点火プラグ、５
はエアクリーナ、６は気化器、７は吸気孔、８は排気孔
で吸気孔７の対向側に設けられている、９は掃気孔で２
個あり、吸気孔７と排気孔８を線を結ぶ直線に関して対
称の位置に設けられている。１０は掃気通路で掃気孔７
に通じその入口はクランクケース２の外周壁に設けられ
ている。2. Description of the Related Art An example of conventional technology will be described with reference to FIGS. FIG. 7 is a cross-sectional view of a main part of a schnee scavenging two-cycle gasoline engine, FIG. 8 is a diagram showing a scavenging flow of a schnee scavenging two-cycle gasoline engine, and FIG.
It is a VIII-VIII sectional view. In the figure, 1 is a cylinder, 2
Is a crankcase, 3 is a piston, 4 is a spark plug, 5
Is an air cleaner, 6 is a carburetor, 7 is an intake hole, 8 is an exhaust hole provided on the opposite side of the intake hole 7, and 9 is a scavenging hole.
They are provided at symmetrical positions with respect to a straight line connecting the intake hole 7 and the exhaust hole 8. Reference numeral 10 is a scavenging passage and scavenging hole 7
The inlet is provided in the outer peripheral wall of the crankcase 2.
【０００３】前記従来例の作用を説明する。ピストン３
が下死点から上昇するとクランクケース２内が負圧にな
り、その圧力差により空気がエアクリーナ５を通って気
化器６に入り混合気になり、吸気孔７を通ってクランク
ケース２の内へ吸込まれる。ピストン３が上死点を経て
降下しピストン３が吸気孔７を閉じた後はクランクケー
ス２内は正圧になり、下死点前で排気弁８が開孔しシリ
ンダ１内の既燃焼ガスが流出する。次いで掃気孔９が開
孔しクランクケース２内の混合気が掃気通路１０を通っ
て掃気孔９からシリンダ１内へ流入し掃気が行われる。
ピストン３が下死点に至り１サイクルが完了する。The operation of the conventional example will be described. Piston 3
Rises from the bottom dead center, the inside of the crankcase 2 becomes a negative pressure, and due to the pressure difference, air enters the carburetor 6 through the air cleaner 5 and becomes an air-fuel mixture, and enters the inside of the crankcase 2 through the intake hole 7. Be sucked. After the piston 3 descends through the top dead center and the piston 3 closes the intake hole 7, the inside of the crankcase 2 becomes a positive pressure, and the exhaust valve 8 is opened before the bottom dead center to burn the burned gas in the cylinder 1. Is leaked. Next, the scavenging hole 9 is opened, and the air-fuel mixture in the crankcase 2 flows through the scavenging passage 10 into the cylinder 1 from the scavenging hole 9 to perform scavenging.
The piston 3 reaches the bottom dead center and one cycle is completed.
【０００４】[0004]
【発明が解決しようとする課題】前記従来の技術には次
に記す問題点がある。掃気孔が開孔したとき排気孔が開
孔している為、シリンダに流入した混合気の一部が燃焼
に関与せずに排気孔に吹き抜ける。これが燃費排ガスの
悪化の原因になっている。本発明の目的は前記従来例の
問題点を解決し濃混合気の直接排気孔への吹き抜けが低
減され、燃費向上と排気ガスの浄化が図られる２サイク
ルエンジンを提供することである。The above-mentioned conventional techniques have the following problems. Since the exhaust hole is opened when the scavenging hole is opened, part of the air-fuel mixture that has flowed into the cylinder blows through the exhaust hole without participating in combustion. This is a cause of deterioration of fuel consumption exhaust gas. An object of the present invention is to provide a two-cycle engine that solves the problems of the conventional example and reduces the blow-through of a rich air-fuel mixture directly into an exhaust hole, thereby improving fuel consumption and purifying exhaust gas.
【０００５】[0005]
【課題を解決するための手段】シリンダの排気孔と第１
吸入孔を結ぶ直線に関して対称に排気孔に近い所と遠い
所に互に隣接して掃気孔を２個づつ設ける。前記各掃気
孔に通ずる掃気通路に、前記排気孔に近い側の掃気通路
と排気通路から遠い側の掃気通路を連通する小さな連絡
孔を設ける。前記排気孔から遠い方の掃気孔は掃気通路
及びピストン及び掃気通路の下部に設けた連通孔によっ
てクランクケース内と連通させ、前記排気孔に近い側の
掃気孔は掃気通路下部に設けられた空気通路１０７によ
りクランクケース内に設けられたその下方でクランクケ
ース内と通じた容積部と連通されている。前記排気孔に
近い側の掃気通路上部にリードバルプ２００を設け前記
各掃気孔を分岐通路１０４、第２吸気通路１０３を介し
てエアクリーナに連通させ、さらにエアクリーナと前記
第２吸気孔とを連通する空気通路に気化器のスロットル
弁と連動する絞り弁１０２を設ける。Means for Solving the Problems Exhaust hole of cylinder and first
Two scavenging holes are provided so as to be symmetrical with respect to the straight line connecting the suction holes, adjacent to each other and far from the exhaust hole. The scavenging passage communicating with each scavenging hole is provided with a small communication hole that connects the scavenging passage on the side close to the exhaust hole and the scavenging passage on the side far from the exhaust passage. The scavenging hole farther from the exhaust hole is communicated with the inside of the crankcase by the scavenging passage and the communicating hole provided in the piston and the lower portion of the scavenging passage, and the scavenging hole near the exhaust hole is the air provided in the lower portion of the scavenging passage. A passage 107 communicates with a volume portion provided inside the crankcase and communicating with the inside of the crankcase. A lead valve 200 is provided in the upper part of the scavenging passage near the exhaust hole so that each scavenging hole communicates with an air cleaner through a branch passage 104 and a second intake passage 103, and air that communicates between the air cleaner and the second intake hole. A throttle valve 102 that interlocks with the throttle valve of the carburetor is provided in the passage.
【０００６】[0006]
【作用】ピストンが上昇するときクランクケース内は負
圧になり外気がエアクリーナを通り気化器を通って混合
気となり第１吸気孔からクランクケース内へ吸入され
る。同時にエアクリーナを通った空気が第２吸気孔、リ
ードバルブ、掃気通路を経て容積部へ充填されるととも
に、一部は連絡孔を通り排気孔から遠い方の掃気通路に
入り掃気通路にある前行程残りの混合気をクランクケー
スに押し戻しながらクランクケースに流入する。ピスト
ンが上死点を通過して下降し始めるとクランクケース内
は正圧となり前記容積部に充填していた空気を排出孔に
近い方の掃気通路から掃気孔を経、一部は連結孔を通り
排気孔より遠い方の掃気通路掃気孔を経てシリンダ内へ
流入する。さらにピストンが下降して排気孔から遠い方
の排気通路とピストンに設けられた連通孔１２１，１２
２が通じクランクケース内の混合気を前記掃気通路を通
してシリンダ内に流入させる。When the piston rises, the inside of the crankcase becomes a negative pressure, and the outside air passes through the air cleaner and the carburetor to form a mixture, which is sucked into the crankcase through the first intake hole. At the same time, the air that has passed through the air cleaner is filled into the volume through the second intake hole, the reed valve, and the scavenging passage, and a part of the air passes through the communication hole and enters the scavenging passage that is far from the exhaust hole. The remaining air-fuel mixture flows into the crankcase while being pushed back into the crankcase. When the piston passes through the top dead center and begins to descend, the pressure inside the crankcase becomes positive and the air filled in the volume section passes through the scavenging passage from the scavenging passage nearer to the discharge hole, and partly through the connecting hole. The scavenging passage farther than the passage exhaust hole flows into the cylinder through the scavenging hole. Further, the piston descends and the exhaust passages farther from the exhaust holes and the communication holes 121, 12 provided in the pistons.
2 through which the air-fuel mixture in the crankcase flows into the cylinder through the scavenging passage.
【０００７】[0007]
【実施例】実施例を図１〜６によって説明する。図１は
実施例の要部断面図、図２は図１のII−II断面図、図３
は図１のIII −III 断面図、図４は図３のIV−IV断面
図、図５は空気と混合気の流れを示す図、図６は掃気排
気タイミング図である。図において１はシリンダ、２は
クランクケース、３はピストン、４は点火プラグ、５は
エアクリーナ、６は気化器、７は第１吸気孔（濃混合気
用）で気化器に連通している。８は排気孔である。前記
各部品は従来公知のものである。１０１は空気通路でエ
アクリーナ５に連通している。１０２は絞り弁で空気通
路１０１の途中に設けられていて、気化器６の図示しな
いスロットル弁と連動している。１０３は第２吸気孔で
空気通路１０１に連通して設けられている。１０４は分
岐通路でシリンダ１の壁内に設けられた穴で第２吸気孔
１０３の内側でシリンダの両側へ分かれて設けられてい
る。１０５は掃気通路で排気孔８に近い側に対称に１個
ずつ設けられている。１０６は掃気通路で排気孔８から
遠い側に対称に１個ずつ設けられている。１０８は容積
部でクランクケース２内にクランクケース２の壁にそっ
て下側の開いた隔壁で区切られた空間である。１０７は
空気通路で掃気通路１０５の下部と容積部１０８を連通
している。１０９，１１０は掃気孔でシリンダ１の第１
吸気孔７と排気孔８とを結ぶ直線に関して対称に２組ず
つ設けられ掃気孔１０９が排気孔８に近い位置に設けら
れている。EXAMPLES Examples will be described with reference to FIGS. 1 is a sectional view of a main part of the embodiment, FIG. 2 is a sectional view taken along line II-II of FIG. 1, and FIG.
3 is a sectional view taken along the line III-III in FIG. 1, FIG. 4 is a sectional view taken along the line IV-IV in FIG. 3, FIG. 5 is a diagram showing the flow of air and air-fuel mixture, and FIG. In the figure, 1 is a cylinder, 2 is a crankcase, 3 is a piston, 4 is a spark plug, 5 is an air cleaner, 6 is a carburetor, and 7 is a first intake hole (for rich mixture), which communicates with the carburetor. Reference numeral 8 is an exhaust hole. The above-mentioned components are conventionally known. 101 is an air passage communicating with the air cleaner 5. A throttle valve 102 is provided in the middle of the air passage 101, and is linked with a throttle valve (not shown) of the carburetor 6. Reference numeral 103 is a second intake hole provided in communication with the air passage 101. Reference numeral 104 denotes a branch passage, which is a hole provided in the wall of the cylinder 1 and is divided into both sides of the cylinder inside the second intake hole 103. The scavenging passages 105 are provided symmetrically one by one on the side close to the exhaust hole 8. The scavenging passages 106 are provided symmetrically one by one on the side far from the exhaust hole 8. Reference numeral 108 denotes a volume portion, which is a space defined in the crankcase 2 by a partition wall that opens downward along the wall of the crankcase 2. An air passage 107 connects the lower portion of the scavenging passage 105 and the volume portion 108. 109 and 110 are scavenging holes, which are the first of the cylinder 1.
Two pairs of scavenging holes 109 are provided symmetrically with respect to a straight line connecting the intake hole 7 and the exhaust hole 8, and are provided at a position near the exhaust hole 8.
【０００８】１２０は連絡孔で掃気通路１０５と掃気通
路１０６を連通している。１２１はピストン３の下部に
設けられた連通孔でピストンが下死点に近い位置で掃気
孔１０６に設けられた連通孔１２２を介して掃気通路１
０６とクランクケース内位置に設けられている。排気孔
８に近い側の掃気孔１０９と容積部１０８とは掃気通路
１０５、空気通路１０７を介して連通されている。掃気
孔１０５はクランクケース２とは直接つながっていな
い。２００はリードバルブで掃気通路１０５の上部の分
岐通路１０４との接続部に設けられている。２０１はス
トッパでリードバルブ２００のリフトを制限する位置に
設けられている。２０２は押え金物でリードバルブ２０
０を押えている。２０３は穴で押え金物２０２に設けら
れ分岐通路１０４と通じる穴である。図５において破線
は空気の流線、実線は混合気の流線である。A communication hole 120 connects the scavenging passage 105 and the scavenging passage 106. Reference numeral 121 denotes a communication hole provided in the lower portion of the piston 3, and the scavenging passage 1 is provided through a communication hole 122 provided in the scavenging hole 106 at a position where the piston is close to the bottom dead center.
06 and the position in the crankcase. The scavenging hole 109 on the side close to the exhaust hole 8 and the volume 108 are communicated with each other via a scavenging passage 105 and an air passage 107. The scavenging hole 105 is not directly connected to the crankcase 2. Reference numeral 200 denotes a reed valve, which is provided at a connection portion with the branch passage 104 above the scavenging passage 105. A stopper 201 is provided at a position where the lift of the reed valve 200 is limited. 202 is a presser foot and is a reed valve 20.
Holds 0. 203 is a hole which is provided in the presser foot 202 and communicates with the branch passage 104. In FIG. 5, the broken line is the streamline of air, and the solid line is the streamline of air-fuel mixture.
【０００９】前記実施例の作用を説明する。ピストン３
が上昇するときクランクケース２内は負圧になり空気が
エアクリーナ５から流れこみ気化器を通って混合気にな
り第１吸気孔７を経てクランクケース２へ吸入される、
気化器６は混合気中の燃料量を従来の２サイクルエンジ
ンのそれと略等しく、空気量を従来の２サイクルエンジ
ンより少なくするようセットされている。エアクリーナ
５を流入した空気は同時に空気通路１０１を通り図示し
ないスロットルと連動する絞り弁１０２で流量調整さ
れ、順次第２吸気孔１０３、分岐通路１０４リードバル
ブ２００、掃気通路１０５、空気通路１０７を通り途中
通路にある前行程の残り混合気を押し出しつつともに容
積部１０８へ充填され、一部の空気は連絡孔１２０、掃
気通路１０６、連通孔１２２，１２１を経て前記通路内
に残留している混合気を押し出しつつともにクランクケ
ース２内へ流入する。The operation of the above embodiment will be described. Piston 3
When the pressure rises, the inside of the crankcase 2 becomes a negative pressure, air flows from the air cleaner 5, passes through the carburetor, and becomes a mixture, and is sucked into the crankcase 2 through the first intake hole 7.
The carburetor 6 is set so that the amount of fuel in the air-fuel mixture is approximately equal to that of the conventional two-cycle engine and the amount of air is smaller than that of the conventional two-cycle engine. The air flowing into the air cleaner 5 passes through the air passage 101 at the same time, and its flow rate is adjusted by a throttle valve 102 that works in conjunction with a throttle (not shown), and then passes through the second intake hole 103, the branch passage 104 reed valve 200, the scavenging passage 105, and the air passage 107 in order. The remaining air-fuel mixture in the previous passage in the middle passage is pushed out and filled in the volume 108 together, and a part of the air is left in the passage through the communication hole 120, the scavenging passage 106, and the communication holes 122 and 121. The air flows into the crankcase 2 together with pushing out the air.
【００１０】ピストン３が上死点を通過して下降をはじ
めるとクランクケース２内は正圧になる。さらにピスト
ン３が下降して排気孔８が開口しシリンダ１内の既燃焼
ガスが流出しはじめ容積部１０８に充填されている空気
が順次空気通路１０７、排気孔８に近い掃気通路１０
５、掃気孔１０９を経て、一部は掃気通路１０５から連
絡孔１２０、排気孔８から遠い方の掃気通路１０６掃気
孔１１０を経てシリンダ内へ流入する。更にピストンが
下降すると、連通孔１２１，１２２が掃気通路１０６に
通じクランクケース２内と掃気通路１０６が通じクラン
クケース２内の混合気が排気孔８から遠い方の掃気通路
１０６を通り掃気孔１１０を経てシリンダ１内へ流入す
る。排気孔、掃気孔の開閉時期は図６に示す。When the piston 3 passes through the top dead center and begins to descend, the inside of the crankcase 2 becomes positive pressure. Further, the piston 3 descends to open the exhaust hole 8 and the burned gas in the cylinder 1 begins to flow out, so that the air filled in the volume 108 is successively in the air passage 107 and the scavenging passage 10 near the exhaust hole 8.
5. After passing through the scavenging hole 109, a part of the gas flows into the cylinder from the scavenging passage 105 through the communication hole 120 and the scavenging passage 106 scavenging hole 110 located farther from the exhaust hole 8. When the piston further descends, the communication holes 121 and 122 communicate with the scavenging passage 106, the interior of the crankcase 2 communicates with the scavenging passage 106, and the air-fuel mixture in the crankcase 2 passes through the scavenging passage 106 farther from the exhaust hole 8 and the scavenging hole 110. Flow into the cylinder 1 via The opening / closing timings of the exhaust holes and the scavenging holes are shown in FIG.
【００１１】[0011]
【発明の効果】本発明は前記のとおり構成したのでピス
トンが上昇するときクランクケース内の負圧により混合
気をエアクリーナ、気化器、第１吸気孔を経てクランク
ケース内に吸入する。また空気が順次エアクリーナ、ス
ロットル弁と連動する絞り弁、第２吸気孔分岐通路、リ
ードバルブ、排気孔に近い方の掃気通路、空気通路を経
て容積部へ充填する、一部の空気は連絡孔、排気孔から
遠い方の掃気通路を経てクランクケース内に流入する。
このとき通路内に残溜する混合気を容積部及びクランク
ケース内に押し戻すことができる。ピストンが下降をは
じめクランクケース内が正圧になってくる。さらにピス
トンが下降し排気孔が開孔しシリンダ内の既燃焼ガスが
流出しはじめその後前記容積部に充填されている空気が
空気通路、排気孔に近い方の掃気通路、掃気孔を経てシ
リンダ内に流入し、また一部は連絡孔を通り排気孔から
遠い方の掃気通路掃気孔を経てシリンダ内に流入しシリ
ンダ内の既燃焼ガスを掃気する。Since the present invention is configured as described above, when the piston rises, the negative pressure in the crankcase sucks the air-fuel mixture into the crankcase through the air cleaner, the carburetor and the first intake hole. In addition, air is sequentially filled into the volume through the air cleaner, the throttle valve that interlocks with the throttle valve, the second intake hole branch passage, the reed valve, the scavenging passage closer to the exhaust hole, and the air passage. , Flows into the crankcase through the scavenging passage farther from the exhaust hole.
At this time, the air-fuel mixture remaining in the passage can be pushed back into the volume and the crankcase. The piston begins to descend and the inside of the crankcase becomes positive pressure. The piston further descends, the exhaust hole opens, the burnt gas in the cylinder begins to flow out, and then the air filled in the volume section passes through the air passage, the scavenging passage closer to the exhaust hole, and the scavenging hole in the cylinder. And a part of the combusted gas in the cylinder is scavenged by flowing into the cylinder through the scavenging passage scavenging hole farther from the exhaust hole through the communication hole.
【００１２】さらにピストンが下降し、クランクケース
と掃気通路が通じ、クランクケース内の混合気をシリン
ダ内に流入させることにより混合気の既燃焼ガスとの混
合及び排気孔からシリンダ外への吹き抜けを防止でき
る。従って燃費を向上できるとともに排気ガスを清浄化
できる。よって本発明は濃混合点の直接排気孔への吹き
抜けが低減され燃費向上と排気ガス浄化が図られる２サ
イクルエンジンを提供できる。Further, the piston descends, the crankcase communicates with the scavenging passage, and the air-fuel mixture in the crankcase flows into the cylinder to mix the air-fuel mixture with the burnt gas and blow it out of the cylinder through the exhaust hole. It can be prevented. Therefore, fuel consumption can be improved and exhaust gas can be purified. Therefore, the present invention can provide a two-cycle engine in which blow-through of the rich mixing point directly into the exhaust hole is reduced and fuel consumption is improved and exhaust gas is purified.
【図１】実施例の２サイクルエンジンの要部断面図。FIG. 1 is a cross-sectional view of a main part of a two-cycle engine according to an embodiment.
【図２】図１のII−II断面図。FIG. 2 is a sectional view taken along line II-II of FIG.
【図３】図１のIII −III 断面図。FIG. 3 is a sectional view taken along the line III-III in FIG.
【図４】図３のIV−IV断面図。4 is a sectional view taken along line IV-IV in FIG.
【図５】実施例の空気と混合気の流れを示す図。FIG. 5 is a diagram showing flows of air and an air-fuel mixture according to the embodiment.
【図６】排気掃気のタイミング図。FIG. 6 is a timing chart of exhaust gas scavenging.
【図７】従来例の２サイクルエンジンの要部断面図。FIG. 7 is a cross-sectional view of a main part of a conventional 2-cycle engine.
【図８】従来例の混合気の流れを示す図。FIG. 8 is a diagram showing a flow of an air-fuel mixture in a conventional example.
【図９】図７のVIII−VIII断面図。9 is a sectional view taken along line VIII-VIII of FIG.
１…シリンダ、２…クランクケース、３…ピストン、４
…点火プラグ、７…第１吸気孔、８…排気孔、１０１…
空気通路、１０２…絞り弁、１０３…第２吸気孔、１０
４…分岐通路、１０５…掃気通路、１０６…掃気通路、
１０７…空気通路、１０８…容積部、１０９…掃気孔、
１１０…掃気孔、１２０…連絡孔、１２１…ピストンの
連通孔、１２２…掃気孔１０６の連通孔、２００…リー
ドバルブ。1 ... Cylinder, 2 ... Crankcase, 3 ... Piston, 4
... Spark plug, 7 ... First intake hole, 8 ... Exhaust hole, 101 ...
Air passage, 102 ... Throttle valve, 103 ... Second intake hole, 10
4 ... Branch passage, 105 ... Scavenging passage, 106 ... Scavenging passage,
107 ... Air passage, 108 ... Volume part, 109 ... Scavenging hole,
110 ... Scavenging hole, 120 ... Communication hole, 121 ... Piston communicating hole, 122 ... Scavenging hole 106 communicating hole, 200 ... Reed valve.
Claims (1)
（７）に排気孔（８）を対設したシリンダ（１）と、前
記第１吸気孔（７）に隣接してシリンダに設けられると
共にエアクリーナ（５）に連通した第２吸気孔（１０
３）と、前記第２吸気孔（１０３）よりシリンダ壁内を
両側に延びた分岐通路（１０４）と、両側の前記分岐通
路（１０４）よりシリンダ内にそれぞれ開口する２個の
掃気孔（１０９）（１１０）と、前記２個の掃気孔の内
前記排気孔（８）から遠いもののピストン下部に設けら
れた連通孔（１２１）を介してクランクケース内と連通
する掃気通路（１０６）と、クランクケースの壁に沿っ
て仕切られ下方でクランクケース内と連通する容積部
（１０８）と、前記２個の掃気孔のうち排気孔（８）に
近いものをリードバルブ（２００）と空気通路（１０
７）を介してクランクケースの容積部（１０８）に連通
する掃気通路（１０５）と、前記各掃気通路間を連通す
る連絡孔（１２０）と、前記第２吸気孔（１０３）とエ
アクリーナ（５）との間に設けられ気化器のスロットル
弁と連動する絞り弁（１０２）とを有してなる２サイク
ルエンジン。1. A cylinder (1) in which a first intake hole (7) communicating with a carburetor (6) is provided with an exhaust hole (8), and a cylinder adjacent to the first intake hole (7). The second intake hole (10) provided and communicating with the air cleaner (5)
3), a branch passage (104) extending from the second intake hole (103) to both sides in the cylinder wall, and two scavenging holes (109) opening in the cylinder from the branch passages (104) on both sides. ) (110) and a scavenging passageway (106) communicating with the inside of the crankcase through a communicating hole (121) provided in the lower part of the piston, which is far from the exhaust hole (8) among the two scavenging holes, A volume part (108) that is partitioned along the wall of the crankcase and communicates with the inside of the crankcase below, and a reed valve (200) and an air passage (200) that are close to the exhaust hole (8) of the two scavenging holes. 10
7), a scavenging passage (105) communicating with the volume (108) of the crankcase, a communication hole (120) communicating between the scavenging passages, the second intake hole (103) and the air cleaner (5). ) And a throttle valve (102) which is provided between the throttle valve and the throttle valve of the carburetor and operates in conjunction with the throttle valve.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP8930892A JPH05256138A (en) | 1992-03-16 | 1992-03-16 | Two-cycle engine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP8930892A JPH05256138A (en) | 1992-03-16 | 1992-03-16 | Two-cycle engine |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH05256138A true JPH05256138A (en) | 1993-10-05 |
Family
ID=13967040
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP8930892A Withdrawn JPH05256138A (en) | 1992-03-16 | 1992-03-16 | Two-cycle engine |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH05256138A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2008138602A (en) * | 2006-12-01 | 2008-06-19 | Husqvarna Zenoah Co Ltd | Stratified scavenging two-cycle engine |
| US7536982B2 (en) | 2002-10-11 | 2009-05-26 | Kawasaki Jukogyo Kabushiki Kaisha | Two-cycle combustion engine of air scavenging type |
| EP2017446A4 (en) * | 2006-05-16 | 2009-07-15 | Nikko Tanaka Engineering Co Lt | TWO-STROKE ENGINE WITH LAMINATED EXHAUST |
-
1992
- 1992-03-16 JP JP8930892A patent/JPH05256138A/en not_active Withdrawn
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7536982B2 (en) | 2002-10-11 | 2009-05-26 | Kawasaki Jukogyo Kabushiki Kaisha | Two-cycle combustion engine of air scavenging type |
| EP2017446A4 (en) * | 2006-05-16 | 2009-07-15 | Nikko Tanaka Engineering Co Lt | TWO-STROKE ENGINE WITH LAMINATED EXHAUST |
| EP2378095A1 (en) * | 2006-05-16 | 2011-10-19 | Hitachi Koki Co., Ltd. | Laminar-scavenging two-cycle engine |
| US8181611B2 (en) | 2006-05-16 | 2012-05-22 | Nikko Tanaka Engineering Co., Ltd. | Stratified scavenging two-cycle engine |
| US9816431B2 (en) | 2006-05-16 | 2017-11-14 | Hitachi Koki Co., Ltd. | Stratified scavenging two-cycle engine |
| JP2008138602A (en) * | 2006-12-01 | 2008-06-19 | Husqvarna Zenoah Co Ltd | Stratified scavenging two-cycle engine |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| A300 | Withdrawal of application because of no request for examination |
Free format text: JAPANESE INTERMEDIATE CODE: A300 Effective date: 19990518 |