JPH0466766A - Suction device of outboard motor - Google Patents

Suction device of outboard motor

Info

Publication number
JPH0466766A
JPH0466766A JP2176443A JP17644390A JPH0466766A JP H0466766 A JPH0466766 A JP H0466766A JP 2176443 A JP2176443 A JP 2176443A JP 17644390 A JP17644390 A JP 17644390A JP H0466766 A JPH0466766 A JP H0466766A
Authority
JP
Japan
Prior art keywords
suction
wall
maniford
block
cylinders
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
JP2176443A
Other languages
Japanese (ja)
Inventor
Mitsuhiko Ota
光彦 太田
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Suzuki Motor Corp
Original Assignee
Suzuki Motor Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Suzuki Motor Corp filed Critical Suzuki Motor Corp
Priority to JP2176443A priority Critical patent/JPH0466766A/en
Publication of JPH0466766A publication Critical patent/JPH0466766A/en
Pending legal-status Critical Current

Links

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
    • F02B75/00—Other engines
    • F02B75/007—Other engines having vertical crankshafts
    • 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
    • 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
    • F02B61/00—Adaptations of engines for driving vehicles or for driving propellers; Combinations of engines with gearing
    • F02B61/04—Adaptations of engines for driving vehicles or for driving propellers; Combinations of engines with gearing for driving propellers
    • F02B61/045—Adaptations of engines for driving vehicles or for driving propellers; Combinations of engines with gearing for driving propellers for marine engines

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

PURPOSE:To distribute the suction gas fed to the upper and the lower crankcases of two cylinders evenly by providing a lower wall to block a lower edge partially furnishing a notch at the center, as well as an upper wall to block an upper edge partially, at the entrance of a suction maniford. CONSTITUTION:In a two-cylinder and two-cycle engine arranging two cylinders 3 up and down, and a crankshaft vertically, the crankcases 5 of the up and down cylinders 3 are connected to a suction maniford 7 through lead valves 6 respectively. In this case, the entrance 8 of the suction maniford 7 is provided biased to the upper side, and connected to a carburetter 9. And, to the entrance 8 of the suction maniford 7, a lower wall 11 is provided projecting upward to block the lower edge, while an upper wall 10 is provided projecting downward to block the upper edge. At the center of the lower wall 11, a notch 12 coincident to the lower edge is provided. As a result, the suction gas flowing in the upper and the lower crankcases can be distributed evenly along the whole rotation area, the operation is stabilized, and the fuel consumption can be reduced.

Description

【発明の詳細な説明】 〔産業上の利用分野〕 この発明は、吸気の分配の向上を図った船外機の吸気装
置に関する。DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an intake device for an outboard motor that improves the distribution of intake air.

〔従来の技術〕[Conventional technology]

船外機は、動力にニサイクルエンジンが用いられること
が多い。そして、船外機では、クランク軸を縦置きにし
、二気筒の場合は、上下に並べて気筒を配置する。上下
のクランク室は、リード弁を介して吸気マニホールドに
連結し、吸気マニホールドの人口に気化器を連結し、気
化器で吸気に燃料を霧化混入して吸気ガスにし、上下の
クランク室が負圧のときに、リード弁が開いて、クラン
ク室に吸気ガスが吸入されるようにしている。例えば、
特開昭６０−２０４９５４号公報、実開昭６１−１４７
６４号公報参照。又、燃料分配を改善するものでは、特
公昭５２−４１８１３号公報が知られている。Outboard motors often use a two-cycle engine for power. In an outboard motor, the crankshaft is placed vertically, and in the case of a two-cylinder engine, the cylinders are arranged one above the other. The upper and lower crank chambers are connected to the intake manifold via reed valves, a carburetor is connected to the intake manifold, and the carburetor atomizes fuel into the intake air to create intake gas, and the upper and lower crank chambers are connected to the intake manifold. When the engine pressure is high, the reed valve opens and intake gas is sucked into the crank chamber. for example,
Japanese Unexamined Patent Publication No. 60-204954, Utility Model Application No. 61-147
See Publication No. 64. Japanese Patent Publication No. 52-41813 is known for improving fuel distribution.

〔発明が解決しようとする課題〕[Problem to be solved by the invention]

二気筒を上下に配置して、クランク軸を縦置きにしたニ
サイクルエンジンでは、気化器の取付は高さ、左右位置
関係、気化器自体のメインノズルの先端位置などによっ
て、上下のクランク室への吸気の分配が大きく変化する
。又、気化器のスロ−系の通路の位置によっても分配が
変化する。In a two-cycle engine with two cylinders arranged one above the other and with a vertical crankshaft, the carburetor installation depends on the height, left-right position, and position of the main nozzle tip of the carburetor itself in the upper and lower crank chambers. The distribution of intake air changes significantly. The distribution also changes depending on the position of the passage in the slow system of the vaporizer.

更に、船外機の場合は、エンジンカバーで覆ったエンジ
ンルーム内が狭く、気化器の取付は位置が制約を受け、
スロットルレバーや、サイレンサーの位置からも制約を
受ける。こうして、気化器から吸気マニホールドを介し
て、上下のクランク室に吸入する吸気ガスにアンバラン
スが生じ、方が濃くなり、他方が薄くなる不都合がある
。Furthermore, in the case of outboard motors, the interior of the engine compartment covered by the engine cover is narrow, and the location of the carburetor is restricted.
There are also restrictions from the position of the throttle lever and silencer. In this way, an imbalance occurs in the intake gas drawn into the upper and lower crank chambers from the carburetor via the intake manifold, and one disadvantageously becomes richer while the other becomes thinner.

この発明は、かかる点に鑑み、吸気マニホールドの入口
の改善によって、上下のクランク室への吸気の分配を均
一化できるようにした船外機の吸気装置を得ることを目
的とする。SUMMARY OF THE INVENTION In view of the above, an object of the present invention is to provide an intake system for an outboard motor that can uniformly distribute intake air to upper and lower crank chambers by improving the inlet of an intake manifold.

〔課題を解決するための手段〕[Means to solve the problem]

上記の目的を達成するために、この発明の船外機の吸気
装置は、気筒を上下に配置した二気筒二サイクルエンジ
ンのクランク室に、リード弁を介して吸気マニホールド
を連結し、吸気マニホールドの人口に気化器を連結する
もので、吸気マニホールドの人口を上側に寄せて設け、
入口に上縁の一部を寒く上壁を設けると共に、下縁の一
部を寒ぎ中央に切欠きを有する下壁を設けたことにある
。In order to achieve the above object, the outboard motor intake system of the present invention connects the intake manifold to the crank chamber of a two-cylinder two-cycle engine in which cylinders are arranged one above the other through a reed valve. The carburetor is connected to the intake manifold, and the intake manifold is placed on the upper side.
At the entrance, a part of the upper edge is cold and an upper wall is provided, and a part of the lower edge is cold and a lower wall with a notch in the center is provided.

〔作　用〕[For production]

低速時には、気化器のベンチュリーの上側に設けたスロ
ー系ポートから燃料が供給される。通常は、上側のクラ
ンク室に流れ易いが、吸気マニホールドの入口に設けた
土壁が邪魔をして上側のクランク室へ流れる量を少くシ
、上下のクランク室へ流れる吸気を均一に配分てきる。At low speeds, fuel is supplied from the slow port located above the carburetor's venturi. Normally, the air flows easily to the upper crank chamber, but the earthen wall installed at the entrance of the intake manifold obstructs the flow, reducing the amount of air flowing to the upper crank chamber and evenly distributing the intake air flowing to the upper and lower crank chambers. .

高速時には、全体的に吸気の流速が速くなり、吸気の流
れは直線状になる。そして、ベンチュリーの中央に開口
するメインノズルから燃料が供給される。そして、低速
時の分配改善の上壁のために、上側のクランク室に較べ
て下側のクランク室が濃い目になる。At high speeds, the overall flow velocity of the intake air increases, and the intake air flow becomes linear. Fuel is then supplied from the main nozzle that opens at the center of the venturi. Because of the upper wall that improves distribution at low speeds, the lower crank chamber becomes darker than the upper crank chamber.

そこで、吸気マニホールド入口の下壁によって下側のク
ランク室が濃くなるのを防ぎ、上下のクランク室への配
分を均一化する。又、下壁の中央に設けた切欠きは、下
壁の前側に燃料が溜るのを防止する。Therefore, the lower wall of the intake manifold inlet prevents the lower crank chamber from becoming denser and equalizes the distribution to the upper and lower crank chambers. Also, the notch provided in the center of the lower wall prevents fuel from accumulating on the front side of the lower wall.

〔実施例〕〔Example〕

以下、本発明の実施例を図面によって説明する。 Embodiments of the present invention will be described below with reference to the drawings.

船外機１の動力に、二気筒二サイクルエンジン２を用い
る場合は、二つの気筒３を上下に配置して、クランク軸
を縦置きにする。エンジン２は、船外機１の上部のエン
ジンカバー４内に配置する。When a two-cylinder two-cycle engine 2 is used to power the outboard motor 1, the two cylinders 3 are arranged one above the other, and the crankshaft is placed vertically. The engine 2 is placed inside an engine cover 4 above the outboard motor 1.

上下の気筒３のクランク室５は、各々リード弁６を介し
て、吸気マニホールド７に連結する。吸気マニホールド
７の入口８は、上側に寄せて設けてあって、気化器９を
連結する。吸気マニホールド７の入口８には、上縁を塞
ぐように下方に突出させて土壁１０を設ける。又、下縁
を塞ぐように上方に突出させて下壁１１を設ける。そし
て、下壁１１の中央には、下縁に一致する切欠き１２を
設ける。気化器９は、ベンチュリー１３の中央にメイン
ノズル１４の上端を開口させてあり、ベンチュリー１３
の土壁にスロー系ポート１５が設けてあって、燃料が吸
出されて霧化混入するようにしである。The crank chambers 5 of the upper and lower cylinders 3 are connected to an intake manifold 7 via reed valves 6, respectively. An inlet 8 of the intake manifold 7 is provided toward the upper side and is connected to a carburetor 9. An earthen wall 10 is provided at the inlet 8 of the intake manifold 7 so as to protrude downward so as to close the upper edge. Further, a lower wall 11 is provided to protrude upward so as to close the lower edge. A notch 12 is provided in the center of the lower wall 11 to match the lower edge. The carburetor 9 has an upper end of a main nozzle 14 opened at the center of the venturi 13.
A slow system port 15 is provided in the earthen wall of the tank, so that fuel can be sucked out and atomized.

低速時は、第４図に示すように、ベンチュリー１３の上
側のスロー系ポート１５から燃料が供給され、上側の近
いクランク室５が濃くなり易いが、上壁１０か迂回させ
、上下のクランク室５への配分を均一化する。高速時は
、第５図に示すように、ベンチュリー１３の中央のメイ
ンノズル１４から燃料が供給され、回転が速いので流速
も速い。このときは、上壁１０たけであると、上側のク
ランク室５が薄くなるが、下壁１１を設けであることに
よって、上下のクランク室５に吸気配分を均一化できる
。又、切欠き１２によって、気化器９のベンチュリ−１
３の出口に、燃料が溜ることもない。At low speeds, as shown in Fig. 4, fuel is supplied from the slow system port 15 on the upper side of the venturi 13, and the crank chamber 5 near the upper side tends to become rich. Equalize the distribution to 5. At high speeds, as shown in FIG. 5, fuel is supplied from the main nozzle 14 at the center of the venturi 13, and since the rotation is fast, the flow rate is also fast. At this time, if the upper wall is only 10 thick, the upper crank chamber 5 becomes thin, but by providing the lower wall 11, the intake air distribution can be made uniform between the upper and lower crank chambers 5. Furthermore, the venturi 1 of the carburetor 9 is
There is no accumulation of fuel at the exit of 3.

〔発明の効果〕〔Effect of the invention〕

以上説明したように、この発明は、上述のように構成し
たので、吸気マニホールドの入口に設けた土壁と下壁に
よって、二気筒の上下のクランク室に供給する吸気を均
一に分配できる。これによって、高低速の運転が安定し
、気化器のセッチングの幅が広くなり、全体に薄目のセ
ッチングでも運転が安定し、燃料の消費量も少なくてき
る。又、下壁に設けた切欠きによって、燃料が溜るのも
防止できる。As explained above, since the present invention is configured as described above, the intake air supplied to the upper and lower crank chambers of the two cylinders can be uniformly distributed by the earthen wall and the lower wall provided at the inlet of the intake manifold. This stabilizes high and low speed operation, widens the range of carburetor settings, stabilizes operation even with thin overall settings, and reduces fuel consumption. Additionally, the notch provided in the lower wall prevents fuel from accumulating.

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

図は本発明の一実施例を示し、 第１図は吸気マニホールド単体の正面図、第２図は同縦
断側面図、 第３図は吸気マニホールドの入口の正面図、第４図は低
速時の状況を示す縦断側面図、第５図は高速時の状況を
示す縦断側面図、第６図はエンジンの一部破断側面図、 第７図は船外機全体の側面図 である。 １・・・船外機、２・・・エンジン、３・・・気筒、５
・・・クランク室、６・・・リード弁、７・・・吸気マ
ニホールド、８・・・入口、９・・・気化器、１０・・
・上壁、１１・・・下壁、１２・・切欠き。The figures show one embodiment of the present invention. Figure 1 is a front view of the intake manifold alone, Figure 2 is a vertical side view of the intake manifold, Figure 3 is a front view of the inlet of the intake manifold, and Figure 4 is at low speed. FIG. 5 is a vertical side view showing the situation at high speed, FIG. 6 is a partially cutaway side view of the engine, and FIG. 7 is a side view of the entire outboard motor. 1... Outboard motor, 2... Engine, 3... Cylinder, 5
... Crank chamber, 6... Reed valve, 7... Intake manifold, 8... Inlet, 9... Carburetor, 10...
- Upper wall, 11... Lower wall, 12... Notch.

Claims (1)

【特許請求の範囲】[Claims] 気筒を上下に配置した二気筒二サイクルエンジンのクラ
ンク室に、リード弁を介して吸気マニホールドを連結し
、吸気マニホールドの入口に気化器を連結するもので、
吸気マニホールドの入口を上側に寄せて設け、入口に上
縁の一部を寒ぐ上壁を設けると共に、下縁の一部を寒ぎ
中央に切欠きを有する下壁を設けたことを特徴とする船
外機の吸気装置。An intake manifold is connected via a reed valve to the crank chamber of a two-cylinder two-stroke engine with cylinders arranged one above the other, and a carburetor is connected to the inlet of the intake manifold.
The inlet of the intake manifold is placed closer to the upper side, and an upper wall is provided at the inlet that cools a part of the upper edge, and a lower wall that cools a part of the lower edge and has a notch in the center is provided. Outboard motor intake system.
JP2176443A 1990-07-05 1990-07-05 Suction device of outboard motor Pending JPH0466766A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP2176443A JPH0466766A (en) 1990-07-05 1990-07-05 Suction device of outboard motor

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP2176443A JPH0466766A (en) 1990-07-05 1990-07-05 Suction device of outboard motor

Publications (1)

Publication Number Publication Date
JPH0466766A true JPH0466766A (en) 1992-03-03

Family

ID=16013795

Family Applications (1)

Application Number Title Priority Date Filing Date
JP2176443A Pending JPH0466766A (en) 1990-07-05 1990-07-05 Suction device of outboard motor

Country Status (1)

Country Link
JP (1) JPH0466766A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2002313316A (en) * 2001-04-11 2002-10-25 Matsushita Electric Ind Co Ltd Battery

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2002313316A (en) * 2001-04-11 2002-10-25 Matsushita Electric Ind Co Ltd Battery

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