JPS61126366A - Fuel supply device of two-cycle engine - Google Patents
Fuel supply device of two-cycle engineInfo
- Publication number
- JPS61126366A JPS61126366A JP24798284A JP24798284A JPS61126366A JP S61126366 A JPS61126366 A JP S61126366A JP 24798284 A JP24798284 A JP 24798284A JP 24798284 A JP24798284 A JP 24798284A JP S61126366 A JPS61126366 A JP S61126366A
- Authority
- JP
- Japan
- Prior art keywords
- crank chamber
- intake pipe
- oil reservoir
- liquid fuel
- fuel supply
- 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
Links
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M33/00—Other apparatus for treating combustion-air, fuel or fuel-air mixture
- F02M33/02—Other apparatus for treating combustion-air, fuel or fuel-air mixture for collecting and returning condensed fuel
- F02M33/04—Other apparatus for treating combustion-air, fuel or fuel-air mixture for collecting and returning condensed fuel returning to the intake passage
-
- 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)
- Lubrication Details And Ventilation Of Internal Combustion Engines (AREA)
- Lubrication Of Internal Combustion Engines (AREA)
Abstract
Description
【発明の詳細な説明】
［産業上の利用分野］
本発明は、２サイクルエンジンの燃料供給装置に関する
。DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a fuel supply device for a two-stroke engine.
［従来の技術〕
船外機等に用いられる２サイクルエンジンには、気化器
を備える吸気管路が、リード弁を介して、クランク室に
連通可能とされる燃料供給装置が用いられている。[Prior Art] A two-stroke engine used in an outboard motor or the like uses a fuel supply device in which an intake pipe including a carburetor can communicate with a crank chamber via a reed valve.
この燃料供給装置は、気化器で気化された燃料と空気と
の混合気を、クランク室負圧の作用下で、リード弁を介
してクランク室に吸入可能としている。This fuel supply device allows a mixture of fuel and air vaporized by a carburetor to be sucked into the crank chamber through a reed valve under the action of negative pressure in the crank chamber.
［発明が解決しようとする問題点］ しかしながら、上記燃料供給装置にあっては。[Problem to be solved by the invention] However, in the above fuel supply device.
気化器で気化されることなく吸気管路に供給された液体
燃料が、リード弁に対する吸気上流側に溜った後、断続
的にクランク室、ひいては燃焼室に流入し、燃焼状態を
不安定化するおそれがある。Liquid fuel that is supplied to the intake pipe without being vaporized by the carburetor accumulates on the intake upstream side of the reed valve, and then intermittently flows into the crank chamber and eventually into the combustion chamber, destabilizing the combustion state. There is a risk.
特に、船外機の浅瀬航走におけるように、船外機本体を
トリムアウト、すなわちリードブＣに対する吸気上流側
をクランク室側に比して下方に位置する状態下で低速運
転する場合には、上記液体燃料の多量の溜りを生じやす
い、したがって、上記船外機において、上記、トリムア
ウトの状態から船外機本体をトリムイン、すなわちリー
ド弁に対する吸気上流側をクランク室側に比して上方に
位置する状態に変位する場合には、多量の液体燃料が一
時的にクランク室、ひいては燃焼室に流入し、燃焼状態
を阻害し、不快な振動等を生じやすい。In particular, when operating at low speed with the outboard motor body trimmed out, that is, the intake upstream side of the reed valve C is positioned lower than the crank chamber side, such as when the outboard motor is running in shallow water. Therefore, in the outboard motor, the outboard motor body is trimmed in from the above-mentioned trim-out state, that is, the intake upstream side with respect to the reed valve is moved upward compared to the crank chamber side. When it is displaced to the position, a large amount of liquid fuel temporarily flows into the crank chamber and eventually into the combustion chamber, which impedes the combustion state and tends to cause unpleasant vibrations.
本発明は、吸気管路側の油溜部に溜る液体燃料が断続的
にクランク室側に流入することによって生ずる燃焼状態
の不安定化を防止することを目的とする。SUMMARY OF THE INVENTION An object of the present invention is to prevent destabilization of the combustion state caused by liquid fuel accumulated in an oil reservoir on the intake pipe side intermittently flowing into the crank chamber.
［問題点を解決するための手段］
本発明は、気化器を備える吸気管路が、リード弁を介し
て、クランク室に連通可能とされている２サイクルエン
ジンの燃料供給装置において、リード弁に対する吸気上
流側に位置する油溜部を、連通路によってクランク室に
連通可能とし、該連通路に、クランク室側から吸気管路
側に向かう正圧の流れを制限する流れ調整手段を設ける
ようにしたものである。[Means for Solving the Problems] The present invention provides a fuel supply system for a two-stroke engine in which an intake pipe including a carburetor can communicate with a crank chamber via a reed valve. The oil reservoir located on the upstream side of the intake air can be communicated with the crank chamber through a communication passage, and the communication passage is provided with a flow adjustment means for restricting the flow of positive pressure from the crank chamber side toward the intake pipe side. It is something.
〔作 用コ
本発明によれば、吸気管路側の油溜部に溜る液体燃料が
常に連通路を介してクランク室側に移送され、したがっ
て、油溜部に溜る液体燃料が断続的にクランク室側に流
入する現象の発生が回避され、燃焼状態を安定化するこ
とが可能となる。[Function] According to the present invention, the liquid fuel accumulated in the oil sump on the intake pipe side is always transferred to the crank chamber side via the communication path, so that the liquid fuel accumulated in the oil sump is intermittently transferred to the crank chamber. This prevents the occurrence of the phenomenon of flow into the side, making it possible to stabilize the combustion state.
［実施例コ
第１図は本発明の一実施例が適用されてなる船外１ｔ１
０を示す側面図、第２図は同船外機１０に搭載されてな
るエンジン１１をトリムアウトの状態下で示す断面図、
第３図および第４図は第２図の要部を拡大して示す断面
図である。[Embodiment Figure 1 shows an outboard 1t1 to which an embodiment of the present invention is applied.
FIG. 2 is a sectional view showing the engine 11 mounted on the outboard motor 10 in a trimmed-out state;
3 and 4 are sectional views showing enlarged main parts of FIG. 2. FIG.
船外機１０は、船体１２に取付は可能とされるクランプ
ブラケット１３と、クランプブラケット１３に傾動可能
に支持されるスイベルブラケット１４と、スイベルブラ
ケット１４に、転舵可能に支持される船外機本体１５と
からなっている。船外機本体１５は、上部にエンジン１
１を搭載し、エンジン１１の出力をプロペラ１６に伝達
可能としている。船外機本体１５は、クランプブラケッ
ト；１３に対するスイベルブラケット１４の傾動を介し
て、第１図に実線で示すトリムダウン位置と、第１図に
二点鎖線で示すトリムアップ位置との間で航走姿勢、保
管姿勢を調整可能とされている。The outboard motor 10 includes a clamp bracket 13 that can be attached to the hull 12, a swivel bracket 14 that is tiltably supported by the clamp bracket 13, and an outboard motor that is supported by the swivel bracket 14 so that it can be steered. It consists of a main body 15. The outboard motor main body 15 has an engine 1 on the top.
1 is installed, and the output of the engine 11 can be transmitted to the propeller 16. The outboard motor main body 15 can be moved between a trim-down position shown by a solid line in FIG. 1 and a trim-up position shown by a two-dot chain line in FIG. The running posture and storage posture can be adjusted.
エンジン１１は、２気筒２サイクルエンジンであり、シ
リンダブロック１７、シリンダヘッド１８、クランクケ
ース１９、ピストン２０、クランク軸２１等を備え、ク
ランク軸２１の下端部にドライブ軸２２の上端部を接続
している。The engine 11 is a two-cylinder two-stroke engine, and includes a cylinder block 17, a cylinder head 18, a crank case 19, a piston 20, a crankshaft 21, etc., and the upper end of a drive shaft 22 is connected to the lower end of the crankshaft 21. ing.
エンジン１１のクランクケース１９は、上下の気筒に対
応する上下のクランク室２３Ａ、２３Ｂを形成し、各ク
ランク室２３Ａ、２３Ｂには、上下の吸気管路２４Ａ、
２４Ｂ、上下の気化器２５Ａ、２５Ｂ、吸気箱２６が接
続されている。各クランク室２３Ａ、２３Ｂと各吸気管
路２４Ａ、２４Ｂのそれぞれとの間には、上下のり一ド
弁２７Ａ、２７Ｂが介在されている。各リード弁２７Ａ
、２７Ｂは、各吸気管路２４Ａ、２４Ｂに固定される枠
体２８Ａ、２８Ｂに配設されている。The crankcase 19 of the engine 11 forms upper and lower crank chambers 23A, 23B corresponding to upper and lower cylinders, and each crank chamber 23A, 23B has an upper and lower intake pipe 24A,
24B, upper and lower carburetors 25A and 25B, and an intake box 26 are connected. Upper and lower gate valves 27A, 27B are interposed between each crank chamber 23A, 23B and each intake pipe 24A, 24B, respectively. Each reed valve 27A
, 27B are arranged on frames 28A, 28B fixed to each intake pipe 24A, 24B.
ここで、上記エンジン１１にあっては、船外機本体１５
を第２図に示すような傾斜状態でトリムアウトする時、
各吸気管路２４Ａ、２４Ｂに液面レベルＡ、Ｂで示すよ
うな未気化液体燃料の油溜部２９Ａ、２９Ｂを生ずる。Here, in the engine 11, the outboard motor main body 15
When trimming out in a tilted state as shown in Figure 2,
Oil reservoirs 29A and 29B of unvaporized liquid fuel as shown by liquid level A and B are formed in each intake pipe 24A and 24B.
上記液体燃料は謂滑油を含むこともある。The liquid fuel may also include so-called lubricating oil.
そこで、上記エンジン１１においては、上リード弁２７
Ａの枠体２８Ａにおける下部に、第３図に示すように、
油溜部２９Ａを上クランク室２３Ａに連通ずる連通路と
しての孔３０を設け、この孔３０に流れ調整手段として
の絞り機能を与えている。Therefore, in the engine 11, the upper reed valve 27
At the bottom of the frame 28A of A, as shown in FIG.
A hole 30 is provided as a communication path that communicates the oil reservoir 29A with the upper crank chamber 23A, and this hole 30 has a throttling function as a flow adjustment means.
また、上記エンジン１１においては、下級気管路２４Ｂ
の下部に固定されて油溜部２９Ｂに連なる管状接続具３
１と、クランクケース１９に固定されて下クランク室２
３Ｂに連通ずる管状接続具３２とに、連通管３３を接続
し、連通管３３に流れ調整手段としての絞り機能を与え
ている。Further, in the engine 11, the lower tracheal passage 24B
The tubular connector 3 is fixed to the lower part of the pipe and connected to the oil sump 29B.
1 and the lower crank chamber 2 which is fixed to the crankcase 19.
A communication pipe 33 is connected to a tubular connector 32 that communicates with 3B, and the communication pipe 33 is given a throttle function as a flow adjustment means.
上記孔３０、管状接続具３２のそれぞれに設けられる絞
り機能は、各クランク室２３Ａ、２３Ｂから各吸気管路
２４Ａ、２４Ｂに向かう正圧の流れを制限し、各クラン
ク室２３Ａ、２３Ｂにおける混合気の一次圧縮性能を損
なうことを防止可能としている。なお、孔３０、管状接
続具３２に備える流れ調整手段は、逆上弁であってもよ
い。The throttle function provided in each of the holes 30 and tubular connectors 32 restricts the flow of positive pressure from each crank chamber 23A, 23B toward each intake pipe 24A, 24B, and the air-fuel mixture in each crank chamber 23A, 23B. This makes it possible to prevent loss of primary compression performance. Note that the flow adjustment means provided in the hole 30 and the tubular connector 32 may be a reverse valve.
上記船外機１０のエンジン１１によれば、各リード弁２
７Ａ、２７Ｂに対する吸気管路２４Ａ、２４Ｂ側の油溜
部２９Ａ、２９Ｂに溜る液体燃料が、常に孔３０、もし
くは管状接続具３１．３２および連通管３３を介して、
各クランク室２３Ａ、２３Ｂに移送可能となる。したが
って、船外機本体１５のトリムアウト状態下で、各油溜
部２９Ａ、２９Ｂに液体燃料の溜りを生じたとしても、
該液体燃料は連続して各クランク室２３Ａ、２３Ｂに流
入し、燃焼状態を安定化可能とする。According to the engine 11 of the outboard motor 10, each reed valve 2
The liquid fuel accumulated in the oil reservoirs 29A and 29B on the side of the intake pipes 24A and 24B with respect to 7A and 27B always flows through the holes 30 or the tubular connectors 31 and 32 and the communication pipe 33.
It becomes possible to transfer to each crank chamber 23A, 23B. Therefore, even if liquid fuel accumulates in each of the oil sump sections 29A and 29B when the outboard motor main body 15 is trimmed out,
The liquid fuel continuously flows into each crank chamber 23A, 23B, making it possible to stabilize the combustion state.
第５図は本発明の変形例を示す断面図である。FIG. 5 is a sectional view showing a modification of the present invention.
この変形例が前記第２図の実施例と異なる点は。This modification differs from the embodiment shown in FIG. 2 above.
２気ａ１８０度爆発間隔のエンジン１１において、Ｌ気
筒側の油溜部２９Ａと下気部側のクランク室２３Ｂの一
部である掃気通路４１Ｂとを、逆止弁４２を備える連通
管４３によって連通ずる。とともに、下気部側の油溜部
２９Ｂと上気部側のクランク室２３Ａの一部である掃気
通路４１Ａとを、逆止弁４４を備える連通管４５によっ
て連通したものである。逆止弁４２．４４は、各掃気通
路４１Ｂ、４１Ａから各吸気管路２４Ａ、２４Ｂに向か
う正圧の流れを阻止可能としている。In the engine 11 with a 180-degree explosion interval, the oil reservoir 29A on the L cylinder side and the scavenging passage 41B, which is a part of the crank chamber 23B on the lower air side, are connected by a communication pipe 43 equipped with a check valve 42. It goes through. At the same time, the oil reservoir 29B on the lower air side and the scavenging passage 41A, which is a part of the crank chamber 23A on the upper air side, are communicated through a communication pipe 45 provided with a check valve 44. The check valves 42, 44 are capable of blocking the flow of positive pressure from the scavenging passages 41B, 41A toward the intake pipes 24A, 24B.
上記変形例にあっては、各吸気管路２４Ａ、２４Ｂと掃
気通路４１Ｂ、４ＬＡの間に逆止弁４２．４４が介在す
るため、各クランク室２３Ｂ、２３Ａで圧縮された混合
気の逆流を生ずることがない。他方、一方のクランク室
２３Ａ（２３Ｂ）が正圧状態にあってそれらと同一気筒
の油溜部２９Ａ （２９Ｂ）に液体燃料が溜まる時に、
他方のクランク室２３Ｂ（２３Ａ）は、負圧状態にある
ことから、油溜部２９Ａ （２９Ｂ）の液体燃料を上記
他方のクランク室２３Ｂ（２３Ａ）の一部である掃気通
路４１Ｂ（４１Ａ）に流出することが可能となる。In the above modification, the check valves 42 and 44 are interposed between the intake pipes 24A and 24B and the scavenging passages 41B and 4LA, so that the backflow of the air-fuel mixture compressed in the crank chambers 23B and 23A is prevented. It never occurs. On the other hand, when one crank chamber 23A (23B) is under positive pressure and liquid fuel accumulates in the oil reservoir 29A (29B) of the same cylinder,
Since the other crank chamber 23B (23A) is in a negative pressure state, the liquid fuel in the oil reservoir 29A (29B) is transferred to the scavenging passage 41B (41A), which is a part of the other crank chamber 23B (23A). It becomes possible to flow out.
讐
上記変形例によれば、油溜部２９Ａ（２９Ｂ）とクラン
ク室２３Ｂ（２３Ａ）との差圧を十分に大きく取ること
が可能であり、油溜部２９Ａ（２９Ｂ）の液体燃料を円
滑に流出させることが可能となる。また、油溜部２９Ａ
（２９Ｂ）を掃気通路４１Ｂ（４ＬＡ）に連通したので
、掃気流による吹出し効果を期待することも可能である
。According to the above modification, the differential pressure between the oil sump 29A (29B) and the crank chamber 23B (23A) can be made sufficiently large, and the liquid fuel in the oil sump 29A (29B) can be smoothly drained. It becomes possible to make it flow out. In addition, the oil sump portion 29A
(29B) is communicated with the scavenging passage 41B (4LA), so it is also possible to expect a blowing effect due to the scavenging air flow.
［発明の効果］
以上のように、本発明は、気化器を備える吸気管路が、
リード弁を介して、クランク室に連通可能とされている
２サイクルエンジンの燃料供給装置において、リード弁
に対する吸気上流側に位置する油溜部を、連通路によっ
てクランク室に連通可能とし、該連通路に、クランク室
側から吸気管路側に向かう正圧の流れを制限する流れ調
整手段を設けるようにしたものである。したがって、リ
ード弁に対する吸気管路側の油溜部に溜る液体燃料が常
に連通路を介してクランク室側に移送され、したがって
油溜部に溜る液体燃料が断続的にクランク室側に流入す
る現象の発生が回避され。[Effects of the Invention] As described above, the present invention provides that the intake pipe line including the carburetor is
In a fuel supply system for a two-stroke engine that can communicate with the crank chamber via a reed valve, an oil reservoir located on the intake upstream side with respect to the reed valve is communicated with the crank chamber through a communication path, and the communication The passage is provided with a flow adjusting means for restricting the flow of positive pressure from the crank chamber side to the intake pipe side. Therefore, the liquid fuel accumulated in the oil sump on the intake pipe side with respect to the reed valve is always transferred to the crank chamber side via the communication path, and therefore the liquid fuel accumulated in the oil sump intermittently flows into the crank chamber. Occurrence has been avoided.
燃焼状態を安定化することが可能となる。 。It becomes possible to stabilize the combustion state. .
第１図は本発明の一実施例が適用されてなる船外機を示
す側面図、第２図は同船外機に搭載されるエンジンを示
す断面図、第３図および第４図は第２図の要部を拡大し
て示す断面図、第５図は本発明の変形例を示す断面図で
ある。
１１・・・エンジン、２３Ａ、２３Ｂ・・・クランク室
、２４Ａ、２４Ｂ・・・吸気管路、２５Ａ、２５Ｂ・・
・気化器、２７Ａ、２７Ｂ・・・リード弁、２９Ａ、２
９Ｂ・・・油溜部、３０・・・孔、３１．３２・・・管
状接続具、３３．４３．４５・・・連通管、４２．４４
・・・逆と弁。Fig. 1 is a side view showing an outboard motor to which an embodiment of the present invention is applied, Fig. 2 is a sectional view showing an engine mounted on the outboard motor, and Figs. FIG. 5 is a sectional view showing a modification of the present invention. 11...Engine, 23A, 23B...Crank chamber, 24A, 24B...Intake pipe, 25A, 25B...
・Carburetor, 27A, 27B... Reed valve, 29A, 2
9B... Oil reservoir, 30... Hole, 31.32... Tubular connector, 33.43.45... Communication pipe, 42.44
...Reverse and valve.
Claims (1)
クランク室に連通可能とされている２サイクルエンジン
の燃料供給装置において、リード弁に対する吸気上流側
に位置する油溜部を、連通路によってクランク室に連通
可能とし、該連通路に、クランク室側から吸気管路側に
向かう正圧の流れを制限する流れ調整手段を設けたこと
を特徴とする２サイクルエンジンの燃料供給装置。(1) An intake pipe line equipped with a carburetor, via a reed valve,
In a fuel supply system for a two-cycle engine that is capable of communicating with the crank chamber, an oil reservoir located on the intake upstream side with respect to the reed valve is communicated with the crank chamber through a communication passage, and the communication passage is connected to the crank chamber side. 1. A fuel supply device for a two-cycle engine, characterized in that a flow adjustment means is provided for restricting the flow of positive pressure from the air to the intake pipe side.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP24798284A JPS61126366A (en) | 1984-11-26 | 1984-11-26 | Fuel supply device of two-cycle engine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP24798284A JPS61126366A (en) | 1984-11-26 | 1984-11-26 | Fuel supply device of two-cycle engine |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS61126366A true JPS61126366A (en) | 1986-06-13 |
| JPH0577876B2 JPH0577876B2 (en) | 1993-10-27 |
Family
ID=17171433
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP24798284A Granted JPS61126366A (en) | 1984-11-26 | 1984-11-26 | Fuel supply device of two-cycle engine |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS61126366A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0482331U (en) * | 1990-11-27 | 1992-07-17 | ||
| US6445836B1 (en) | 1997-03-18 | 2002-09-03 | Fujitsu Limited | Image processing apparatus |
| JP2007229035A (en) * | 2006-02-28 | 2007-09-13 | Daito Giken:Kk | Game machine, and game machine fall preventing stand |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS53107710U (en) * | 1977-02-07 | 1978-08-29 | ||
| JPS58175163U (en) * | 1982-05-18 | 1983-11-22 | 北村 修一 | Fuel atomization device for two-stroke internal combustion engine |
-
1984
- 1984-11-26 JP JP24798284A patent/JPS61126366A/en active Granted
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS53107710U (en) * | 1977-02-07 | 1978-08-29 | ||
| JPS58175163U (en) * | 1982-05-18 | 1983-11-22 | 北村 修一 | Fuel atomization device for two-stroke internal combustion engine |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0482331U (en) * | 1990-11-27 | 1992-07-17 | ||
| US6445836B1 (en) | 1997-03-18 | 2002-09-03 | Fujitsu Limited | Image processing apparatus |
| JP2007229035A (en) * | 2006-02-28 | 2007-09-13 | Daito Giken:Kk | Game machine, and game machine fall preventing stand |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0577876B2 (en) | 1993-10-27 |
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