JPH0882247A - Drain device for carburetor of gasoline engine - Google Patents
Drain device for carburetor of gasoline engineInfo
- Publication number
- JPH0882247A JPH0882247A JP21841894A JP21841894A JPH0882247A JP H0882247 A JPH0882247 A JP H0882247A JP 21841894 A JP21841894 A JP 21841894A JP 21841894 A JP21841894 A JP 21841894A JP H0882247 A JPH0882247 A JP H0882247A
- Authority
- JP
- Japan
- Prior art keywords
- negative pressure
- fuel
- chamber
- valve
- engine
- 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
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
- F02B1/00—Engines characterised by fuel-air mixture compression
- F02B1/02—Engines characterised by fuel-air mixture compression with positive ignition
- F02B1/04—Engines characterised by fuel-air mixture compression with positive ignition with fuel-air mixture admission into cylinder
Landscapes
- Cooling, Air Intake And Gas Exhaust, And Fuel Tank Arrangements In Propulsion Units (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明はガソリンエンジンの気化
器のドレン装置に関し、エンジンの停止時に、フロート
室の燃料を簡略な構造で自動的にドレンできるものを提
供する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a drain device for a carburetor of a gasoline engine, and provides a device for automatically draining the fuel in the float chamber with a simple structure when the engine is stopped.
【０００２】[0002]
【発明の背景】一般に、ガソリンエンジンを長期保管す
る場合、気化器のフロート室内に燃料をそのまま残留さ
せると、燃料が気化した後にガム質が残り、これがメイ
ンジェットに膠着するなどの弊害があるので、残留燃料
は保管時に抜き去ってドレンする必要がある。BACKGROUND OF THE INVENTION Generally, when a gasoline engine is stored for a long period of time, if the fuel is left as it is in the float chamber of the carburetor, gums remain after vaporization of the fuel, which may cause sticking to the main jet. Residual fuel needs to be drained and drained during storage.
【０００３】本発明はこのガソリンエンジンの気化器の
ドレン装置を対象とし、その基本構造は、図１又は図４
に示すように、ガソリンエンジンＥの上方に気化器１
を、下方に燃料タンク２を各々配置し、燃料タンク２を
フィードポンプ３及び燃料供給路４を介して気化器１の
フロート室５に連通し、上記フロート室５に燃料排出手
段６を設けた形式のものである。The present invention is directed to the drain device of the carburetor of this gasoline engine, the basic structure of which is shown in FIG. 1 or 4.
As shown in FIG.
And the fuel tanks 2 are respectively arranged below, and the fuel tanks 2 are communicated with the float chamber 5 of the carburetor 1 through the feed pump 3 and the fuel supply passage 4, and the fuel discharge means 6 is provided in the float chamber 5. It is of the form.
【０００４】[0004]
【従来の技術】この形式の従来技術としては、実開昭６
３―１９８４５５号公報に示すように(図４参照)、上記
燃料排出手段６が、フロート室５の底壁５ａから導出し
た排出管５０と、この排出管５０に介装した開閉コック
５１から構成されたものがある。2. Description of the Related Art As a conventional technology of this type,
As shown in Japanese Patent Laid-Open No. 3-198455 (see FIG. 4), the fuel discharge means 6 is composed of a discharge pipe 50 led out from the bottom wall 5a of the float chamber 5 and an opening / closing cock 51 interposed in the discharge pipe 50. There was something that was done.
【０００５】[0005]
【発明が解決しようとする課題】上記従来技術では、気
化器１のフロート室５から残留燃料をドレンする場合、
手動で開閉コック５１を開弁操作する必要があるうえ、
ドレン操作の後に再び閉弁操作することを要するため、
操作が煩雑である。そのうえ、ドレン操作自体を作業者
が忘れてしまう虞れもある。本発明は、エンジンの停止
時にフロート室の残留燃料を簡略な構造で自動的にドレ
ンすることを技術的課題とする。In the above prior art, when the residual fuel is drained from the float chamber 5 of the carburetor 1,
In addition to the need to manually open and close the opening and closing cock 51,
Since it is necessary to close the valve again after the drain operation,
The operation is complicated. In addition, the operator may forget the drain operation itself. An object of the present invention is to automatically drain residual fuel in the float chamber with a simple structure when the engine is stopped.
【０００６】[0006]
【課題を解決するための手段】上記課題を達成するため
の手段を、実施例を示す図１〜図２により以下に説明す
る。即ち、本発明は前記基本構造のガソリンエンジンの
気化器のドレン装置において、上記燃料排出手段６は、
フロート室５と燃料タンク２を連通する燃料戻し路７
と、燃料戻し路７に介装した負圧コック８とから構成さ
れ、上記負圧コック８は、負圧作動体１０が臨む負圧作
動室１２と、燃料が流れる通油室１６と、負圧作動体１
０と一体に同行進退して通油室１６の弁口１４に臨ませ
た弁体１５と、負圧作動室１２の閉弁方向への負圧作動
力に抗して弁体１５を弁座１３から開弁方向に弾圧付勢
する弁バネ１７とから構成され、上記負圧コック８の負
圧作動室１２をエンジンＥの吸気路１８に通気路２０を
介して連通して、エンジンＥの運転時には、吸気路１８
の負圧により発生する上記負圧コック８の負圧作動室１
２の負圧作動力が弁バネ１７の張力に打ち勝ち、弁体１
５が通油室１６の弁口１４を閉弁して、フロート室５か
ら燃料タンク２への燃料の流下を解除するのに対し、エ
ンジンＥが停止すると、負圧作動室１２の負圧作動力が
無くなって、上記弁バネ１７の張力により弁体１５が通
油室１６の弁口１４を開弁して、フロート室５の燃料を
燃料戻し路７及び負圧コック８の通油室１６を介して燃
料タンク２に流下して戻すように構成したことを特徴と
するものである。上記負圧作動体１０とは、例えば、ダ
イヤフラム形作動シリンダのダイヤフラム、またはピス
トン形作動シリンダのピストンをいう。上記吸気路１８
とは、例えば、吸気管や気化器１のベンチュリなどをい
う。Means for achieving the above object will be described below with reference to FIGS. 1 and 2 showing an embodiment. That is, according to the present invention, in the drain device of the carburetor of the gasoline engine having the basic structure, the fuel discharge means 6 is
Fuel return path 7 that connects the float chamber 5 and the fuel tank 2
And a negative pressure cock 8 interposed in the fuel return passage 7. The negative pressure cock 8 includes a negative pressure working chamber 12 facing the negative pressure working body 10, an oil passage chamber 16 through which fuel flows, and a negative pressure working chamber 16. Pressure actuator 1
The valve body 15 that moves forward and backward together with 0 to face the valve opening 14 of the oil passage chamber 16 and the valve body 15 against the negative pressure operating force of the negative pressure operating chamber 12 in the valve closing direction. 13 and a valve spring 17 for elastically biasing the valve in the valve opening direction. The negative pressure working chamber 12 of the negative pressure cock 8 communicates with an intake passage 18 of the engine E via a ventilation passage 20 to make the engine E During operation, the intake passage 18
Negative pressure working chamber 1 of the negative pressure cock 8 generated by the negative pressure of
The negative pressure actuation force of 2 overcomes the tension of the valve spring 17 and the valve body 1
5 closes the valve port 14 of the oil passage chamber 16 to release the flow of fuel from the float chamber 5 to the fuel tank 2, whereas when the engine E is stopped, the negative pressure operation of the negative pressure working chamber 12 is performed. When the power is lost, the valve element 15 opens the valve port 14 of the oil passage chamber 16 by the tension of the valve spring 17, and the fuel in the float chamber 5 is fed to the fuel return passage 7 and the oil passage chamber 16 of the negative pressure cock 8. It is characterized in that it is configured to flow down to and return to the fuel tank 2 via. The negative pressure actuating body 10 means, for example, a diaphragm of a diaphragm type working cylinder or a piston of a piston type working cylinder. The intake passage 18
The term, for example, means an intake pipe or a venturi of the carburetor 1.
【０００７】[0007]
【作用】ガソリンエンジンＥが停止すると、図１Ｂに示
すように、吸気路１８に接続する負圧コック８の負圧作
動室１２には負圧がなくなり、負圧作動室１２が負圧コ
ック８の大気室１１と拮抗するため、負圧コック８の弁
バネ１７の張力により弁体１５が通油室１６の弁口１４
を開弁し、フロート室５の燃料を燃料戻し路７及び負圧
コック８の通油室１６を介して燃料タンク２に流下して
戻す。このため、エンジンＥの停止に伴い、気化器１の
フロート室５から残留燃料を燃料戻し路７を介して燃料
タンク１に自動的にドレンできる。When the gasoline engine E is stopped, as shown in FIG. 1B, the negative pressure working chamber 12 of the negative pressure cock 8 connected to the intake passage 18 has no negative pressure, and the negative pressure working chamber 12 is kept in the negative pressure cock 8. Of the negative pressure cock 8, the valve element 15 is forced to move the valve body 15 by the tension of the valve spring 17 of the negative pressure cock 8.
Is opened, and the fuel in the float chamber 5 flows back to the fuel tank 2 through the fuel return passage 7 and the oil passage chamber 16 of the negative pressure cock 8. Therefore, when the engine E is stopped, the residual fuel can be automatically drained from the float chamber 5 of the carburetor 1 to the fuel tank 1 through the fuel return path 7.
【０００８】また、エンジンＥの運転時には、図１Ａに
示すように、吸気路１８に生じた負圧が通気路２０を介
して負圧コック８の負圧作動室１２に波及するため、負
圧作動室１２の負圧力が弁バネ１７の張力に打ち勝ち、
弁体１５が通油室１６の弁口１４を閉弁する。このた
め、フロート室５から燃料タンク２への燃料の流下は解
除されるとともに、燃料タンク１の燃料がフィードポン
プ３の作用で気化器１のフロート室５に円滑に供給され
る。Further, when the engine E is in operation, as shown in FIG. 1A, the negative pressure generated in the intake passage 18 propagates to the negative pressure operating chamber 12 of the negative pressure cock 8 through the air passage 20, so that the negative pressure is reduced. The negative pressure of the working chamber 12 overcomes the tension of the valve spring 17,
The valve body 15 closes the valve opening 14 of the oil passage chamber 16. Therefore, the flow of fuel from the float chamber 5 to the fuel tank 2 is released, and the fuel in the fuel tank 1 is smoothly supplied to the float chamber 5 of the carburetor 1 by the action of the feed pump 3.
【０００９】一方、例えば、実公昭６０―３９７０号公
報(図３参照)には、気化器１のフロート室５を燃料タン
ク２に燃料戻し路７で連通し、燃料戻し路７にドレン用
ポンプ５５を設け、燃料濾器１９に開閉スイッチ５６を
臨ませ、ドレン用ポンプ５５の駆動用モータ５７を開閉
スイッチ５６に連結して、エンジンＥの停止に伴い、燃
料濾器１９の切り替えレバー１９ａが閉位置に切り替わ
ると、開閉スイッチ５６がオンしてモータ５７がドレン
用ポンプ５５を駆動し、気化器１のフロート室５の残留
燃料を燃料戻し路７から燃料タンク２に還流して、自動
的にドレンする技術が開示されている。On the other hand, for example, in Japanese Utility Model Publication No. 60-3970 (see FIG. 3), the float chamber 5 of the carburetor 1 is communicated with the fuel tank 2 through a fuel return passage 7, and the fuel return passage 7 is provided with a drain pump. 55, the opening / closing switch 56 is exposed to the fuel filter 19, the drive motor 57 of the drain pump 55 is connected to the opening / closing switch 56, and the switching lever 19a of the fuel filter 19 is closed when the engine E is stopped. When the switch is turned on, the open / close switch 56 is turned on, the motor 57 drives the drain pump 55, and the residual fuel in the float chamber 5 of the carburetor 1 is returned to the fuel tank 2 from the fuel return path 7 and the drain is automatically drained. Techniques for doing so are disclosed.
【００１０】しかしながら、当該公知技術では、ドレン
用ポンプ５５やモータ５７やエンジン停止操作検出用の
スイッチ５６などの専用のドレン駆動機構をエンジンＥ
に付加する必要があり、構造が複雑でコストが嵩む。こ
れに対して、本発明では、負圧コック８の負圧作動室１
２を吸気路１８に接続して、吸気路１８の負圧を利用す
るだけなので、構造が簡略で、コストを低減できる。However, in the known technique, a dedicated drain drive mechanism such as the drain pump 55, the motor 57, and the switch 56 for detecting the engine stop operation is provided in the engine E.
However, the structure is complicated and the cost is high. On the other hand, in the present invention, the negative pressure operating chamber 1 of the negative pressure cock 8
Since 2 is connected to the intake passage 18 and only the negative pressure of the intake passage 18 is used, the structure is simple and the cost can be reduced.
【００１１】[0011]
(1)エンジンの停止の度ごとに、気化器のフロート室か
ら残留燃料を燃料戻し路を介して燃料タンクに自動的に
ドレンできる。このため、ドレン操作が簡単であり、長
期保管の場合でも、ドレンの操作忘れを確実に防止でき
る。 (2)本発明は吸気路の負圧を利用してドレンするので、
専用のドレン駆動機構をエンジンに付加する必要がな
く、構造が簡略であって安価に実施できる。(1) Residual fuel can be automatically drained from the float chamber of the carburetor to the fuel tank through the fuel return path each time the engine is stopped. Therefore, the drain operation is easy, and even if the drain is stored for a long period of time, it is possible to reliably prevent forgetting the drain operation. (2) Since the present invention uses the negative pressure of the intake passage to drain,
There is no need to add a dedicated drain drive mechanism to the engine, and the structure is simple and can be implemented at low cost.
【００１２】[0012]
【実施例】以下、本発明の実施例を図面に基づいて述べ
る。図１は縦型ガソリンエンジンの気化器のドレン装置
の要部系統図、図２は同ドレン装置の全体概略系統図で
ある。Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a main part system diagram of a drain device of a carburetor of a vertical gasoline engine, and FIG. 2 is an overall schematic system diagram of the drain device.
【００１３】図２に示すように、縦型ガソリンエンジン
Ｅに気化器１を配置し、気化器１の下方に燃料タンク２
を配置し、燃料タンク２から気化器１のフロート室５に
燃料供給路２を連通し、燃料供給路２に燃料濾器１９及
びフィードポンプ３を介装し、フロート室５に燃料排出
手段６を設ける。上記燃料排出手段６は、フロート室５
とこれより低位の燃料タンク２を連通する燃料戻し路７
と、燃料戻し路７に介装した負圧コック８とから構成さ
れる。As shown in FIG. 2, a carburetor 1 is arranged in a vertical gasoline engine E, and a fuel tank 2 is provided below the carburetor 1.
The fuel supply path 2 is connected from the fuel tank 2 to the float chamber 5 of the carburetor 1, the fuel filter 19 and the feed pump 3 are provided in the fuel supply path 2, and the fuel discharge means 6 is installed in the float chamber 5. Set up. The fuel discharging means 6 is the float chamber 5
And the fuel return path 7 that communicates with the fuel tank 2 that is lower than this
And a negative pressure cock 8 interposed in the fuel return passage 7.
【００１４】図１に示すように、上記負圧コック８は、
ダイヤフラム（負圧作動体）１０を介して区画される負
圧作動室１２及び大気室１１と、燃料が流れる通油室１
６と、ダイヤフラム１０と一体に同行進退して通油室１
６の弁口１４に臨ませた弁体１５と、弁体１５を弁座１
３から開弁方向に弾圧付勢する弁バネ１７とから構成さ
れる。As shown in FIG. 1, the negative pressure cock 8 is
A negative pressure working chamber 12 and an atmosphere chamber 11 partitioned by a diaphragm (negative pressure working body) 10, and an oil passage chamber 1 through which fuel flows
6 and the diaphragm 10 together with the diaphragm 10 to move forward and backward.
Valve body 15 facing the valve opening 14 of 6 and the valve body 15
3 and a valve spring 17 that elastically biases the valve opening direction.
【００１５】即ち、図１及び図２に示すように、コック
本体２１の前側方に通油室１６を設け、通油室１６の前
部に弁口１４を開け、通油室１６の下側壁に出口２２を
開け、フロート室５から弁口１４にかけて、及び、出口
２２から燃料タンク２の燃料キャップ２３にかけての２
箇所を燃料戻し路７で連通する。上記コック本体２１の
後側方に負圧作動室１２及び大気室１１をダイヤフラム
１０を介して直列状に形成し、気化器１のベンチュリ１
８を負圧作動室１２に通気路２０で連通し、大気室１１
を通気口２４を介して大気に連通する。That is, as shown in FIGS. 1 and 2, an oil passage chamber 16 is provided on the front side of the cock body 21, a valve port 14 is opened in the front portion of the oil passage chamber 16, and the lower wall of the oil passage chamber 16 is opened. An outlet 22 is opened in the fuel tank 2 from the float chamber 5 to the valve opening 14 and from the outlet 22 to the fuel cap 23 of the fuel tank 2.
The points are communicated with each other through the fuel return path 7. A negative pressure working chamber 12 and an atmosphere chamber 11 are formed in series on the rear side of the cock body 21 via a diaphragm 10, and the venturi 1 of the vaporizer 1 is formed.
8 is connected to the negative pressure working chamber 12 by a ventilation passage 20,
Is communicated with the atmosphere via the vent 24.
【００１６】図１に示すように、上記ダイヤフラム１０
から出力ロッド２５を前方に導出し、出力ロッド２５の
先端に略円錐台状の弁体１５を形成し、弁体１５を前記
通油室１６の弁口１４の弁座１３に前後進退可能に臨ま
せる。前記負圧作動室１２に弁バネ１７を配置し、弁バ
ネ１７でダイヤフラム１０を後方に弾圧し、このダイヤ
フラム１０と同行移動する弁体１５を弁座１３に対して
開弁方向に付勢する。As shown in FIG. 1, the diaphragm 10 is
The output rod 25 is led out from the front of the output rod 25, and a substantially frustoconical valve body 15 is formed at the tip of the output rod 25. To face. A valve spring 17 is arranged in the negative pressure operating chamber 12, and the diaphragm 10 is elastically pushed rearward by the valve spring 17 to urge the valve body 15 moving along with the diaphragm 10 toward the valve seat 13 in the valve opening direction. .
【００１７】そして、上記負圧コック８を下記の通りに
条件付ける。 (a)エンジンＥの運転時には、負圧作動室１２の負圧力
が弁バネ１７の張力に打ち勝ち、弁体１５が通油室１６
の弁座１３に着座して閉弁する。 (b)エンジンＥが停止すると、上記弁バネ１７の張力に
より、弁体１５が通油室１６の弁座１３から離間して開
弁する。Then, the negative pressure cock 8 is conditioned as follows. (a) During the operation of the engine E, the negative pressure of the negative pressure working chamber 12 overcomes the tension of the valve spring 17 and the valve body 15 moves to the oil passage chamber 16
The valve seat 13 is seated and the valve is closed. (b) When the engine E stops, the tension of the valve spring 17 causes the valve body 15 to separate from the valve seat 13 of the oil passage chamber 16 and open the valve.
【００１８】そこで、本実施例の縦型ガソリンエンジン
の気化器のドレン装置の機能を説明する。 (1)ガソリンエンジンＥの運転時には、図１Ａに示すよ
うに、ベンチュリ１８に発生した負圧が通気路２０を介
して負圧コック８の負圧作動室１２に及ぶので、負圧作
動室１２の負圧力が弁バネ１７の張力に打ち勝ち、弁体
１５が弁座１３に向かって前進し、通油室１６の弁口１
４を閉弁する。このため、燃料タンク２の燃料はフィー
ドポンプ３の作用でフロート室５に円滑に圧送されると
ともに、フロート室５から燃料タンク２への燃料の流下
は解除されて、ドレン操作は継続阻止される。Therefore, the function of the drain device of the carburetor of the vertical gasoline engine of this embodiment will be described. (1) During operation of the gasoline engine E, as shown in FIG. 1A, since the negative pressure generated in the venturi 18 reaches the negative pressure operating chamber 12 of the negative pressure cock 8 through the air passage 20, the negative pressure operating chamber 12 Negative pressure overcomes the tension of the valve spring 17, the valve body 15 advances toward the valve seat 13, and the valve opening 1 of the oil passage chamber 16
4 is closed. Therefore, the fuel in the fuel tank 2 is smoothly pumped to the float chamber 5 by the action of the feed pump 3, and the flow of the fuel from the float chamber 5 to the fuel tank 2 is released, so that the drain operation is continuously prevented. .
【００１９】(2)エンジンＥが停止すると、図１Ｂに示
すように、ベンチュリ１８に発生すべき負圧がなくなる
ので、上記弁バネ１７の張力により弁体１５が弁座１３
から後退して、通油室１６の弁口１４を開弁する。この
ため、フロート室５の残留燃料は、燃料戻し路７及び負
圧コック８の通油室１６を介して燃料タンク２に流下し
て戻り(図１Ｂの矢印参照)、ドレン操作は円滑に完了す
る。(2) When the engine E is stopped, as shown in FIG. 1B, the negative pressure to be generated in the venturi 18 disappears, so that the tension of the valve spring 17 causes the valve element 15 to move the valve seat 15 into the valve seat 13.
And the valve port 14 of the oil passage chamber 16 is opened. Therefore, the residual fuel in the float chamber 5 flows down and returns to the fuel tank 2 through the fuel return passage 7 and the oil passage chamber 16 of the negative pressure cock 8 (see the arrow in FIG. 1B), and the drain operation is completed smoothly. To do.
【００２０】この結果、ガソリンエンジンＥの停止に伴
い、フロート室５内の残留燃料を燃料戻し路７を介して
燃料タンク１に自動的にドレンでき、ドレン操作が簡単
になるとともに、長期保管の場合でも、ドレンの操作忘
れを確実に防止できる。また、本実施例は負圧コックの
付設により、吸気路の負圧を利用してドレンするので、
専用のドレン機構をエンジンに付加する必要がなく、構
造が簡略で、安価に実施できる。As a result, when the gasoline engine E is stopped, the residual fuel in the float chamber 5 can be automatically drained to the fuel tank 1 through the fuel return path 7, which simplifies the drain operation and enables long-term storage. Even in the case, forgetting to operate the drain can be reliably prevented. Further, in this embodiment, since the negative pressure cock is attached, the negative pressure in the intake passage is used for draining.
There is no need to add a dedicated drain mechanism to the engine, the structure is simple, and it can be implemented at low cost.
【００２１】尚、本発明では、負圧コック８の負圧作動
室１２を、上記実施例のように通気路２０を介して気化
器１のベンチュリに接続する替わりに、ガソリンエンジ
ンＥの吸気管、吸気ポート、或はエアクリーナの浄化室
などの吸気路の適正箇所に接続しても差し支えない。In the present invention, instead of connecting the negative pressure working chamber 12 of the negative pressure cock 8 to the venturi of the carburetor 1 through the air passage 20 as in the above embodiment, the intake pipe of the gasoline engine E is replaced. , It may be connected to a proper part of the intake passage such as the intake port or the cleaning chamber of the air cleaner.
【図１】本発明の実施例を示す縦型ガソリンエンジンの
気化器のドレン装置の要部系統図であり、図１Ａは閉弁
状態、図１Ｂは開弁状態の各々説明図である。FIG. 1 is a system diagram of a main part of a drain device of a carburetor for a vertical gasoline engine showing an embodiment of the present invention, FIG. 1A is a valve closed state, and FIG. 1B is a valve open state.
【図２】同実施例のドレン装置の全体概略系統図であ
る。FIG. 2 is an overall schematic system diagram of the drain device according to the embodiment.
【図３】自動方式のドレン装置の公知技術を示す概略系
統図である。FIG. 3 is a schematic system diagram showing a known technique of an automatic drain device.
【図４】従来技術を示すガソリンエンジンの気化器のド
レン装置の要部説明図である。FIG. 4 is an explanatory view of a main part of a drain device of a carburetor of a gasoline engine showing a conventional technique.
１…気化器、２…燃料タンク、３…フィードポンプ、４
…燃料供給路、５…フロート室、６…燃料排出手段、７
…燃料戻し路、８…負圧コック、１０…負圧作動体（ダ
イヤフラム）、１２…負圧作動室、１３…弁座、１４…
弁口、１５…弁体、１６…通油室、１７…弁バネ、１８
…吸気路、２０…通気路、Ｅ…ガソリンエンジン。1 ... Vaporizer, 2 ... Fuel tank, 3 ... Feed pump, 4
... Fuel supply path, 5 ... Float chamber, 6 ... Fuel discharging means, 7
... Fuel return path, 8 ... Negative pressure cock, 10 ... Negative pressure actuation body (diaphragm), 12 ... Negative pressure actuation chamber, 13 ... Valve seat, 14 ...
Valve mouth, 15 ... Valve body, 16 ... Oil passage chamber, 17 ... Valve spring, 18
… Intake, 20… vent, E… gasoline engine.
Claims (1)
置し、気化器(１)の下方に燃料タンク(２)を配置し、燃
料タンク(２)をフィードポンプ(３)及び燃料供給路(４)
を介して気化器(１)のフロート室(５)に連通し、 上記フロート室(５)に燃料排出手段(６)を設けたガソリ
ンエンジンの気化器のドレン装置において、 上記燃料排出手段(６)は、フロート室(５)と燃料タンク
(２)を連通する燃料戻し路(７)と、燃料戻し路(７)に介
装した負圧コック(８)とから構成され、 上記負圧コック(８)は、負圧作動体(１０)が臨む負圧作
動室(１２)と、燃料が流れる通油室(１６)と、負圧作動
体(１０)と一体に同行進退して通油室(１６)の弁口(１
４)に臨ませた弁体(１５)と、負圧作動室（１２）の閉
弁方向への負圧作動力に抗して弁体(１５)を弁座(１３)
から開弁方向に弾圧付勢する弁バネ(１７)とから構成さ
れ、 上記負圧コック(８)の負圧作動室(１２)をエンジン(Ｅ)
の吸気路(１８)に通気路(２０)を介して連通して、 エンジン(Ｅ)の運転時には、吸気路（１８）の負圧によ
り発生する上記負圧コック(８)の負圧作動室(１２)の負
圧作動力が弁バネ(１７)の張力に打ち勝ち、弁体(１５)
が通油室(１６)の弁口(１４)を閉弁し、フロート室(５)
から燃料タンク(２)への燃料の流下を解除するのに対
し、 エンジン(Ｅ)が停止すると、負圧作動室（１２）の負圧
作動力が無くなって、上記弁バネ(１７)の張力により弁
体(１５)が通油室(１６)の弁口(１４)を開弁して、フロ
ート室(５)の燃料を燃料戻し路(７)及び負圧コック(８)
の通油室(１６)を介して燃料タンク(２)に流下して戻す
ように構成したことを特徴とするガソリンエンジンの気
化器のドレン装置。1. A gasoline engine (E) is provided with a carburetor (1), a fuel tank (2) is provided below the carburetor (1), and the fuel tank (2) is provided with a feed pump (3) and a fuel. Supply path (4)
In the drain device of the carburetor for a gasoline engine, which is connected to the float chamber (5) of the carburetor (1) through the above and is provided with the fuel discharge means (6) in the float chamber (5), ) Is the float chamber (5) and fuel tank
(2) is connected to the fuel return path (7), and the fuel return path (7) is provided with a negative pressure cock (8). The negative pressure cock (8) is a negative pressure actuator (10). ), The negative pressure working chamber (12), the oil passage chamber (16) through which the fuel flows, and the negative pressure actuating body (10) integrally advance and retreat together to open the valve opening (1) of the oil passage chamber (16).
4) and the valve body (15) facing the valve body (15) against the negative pressure actuation force in the valve closing direction of the negative pressure operation chamber (12).
And a valve spring (17) for elastically biasing the valve in the valve opening direction from the engine (E) to the negative pressure working chamber (12) of the negative pressure cock (8).
The negative pressure working chamber of the negative pressure cock (8), which communicates with the intake passage (18) of the engine through the ventilation passage (20) and is generated by the negative pressure of the intake passage (18) during operation of the engine (E). The negative pressure actuating force of (12) overcomes the tension of the valve spring (17) and the valve body (15)
Closed the valve port (14) of the oil passage chamber (16), and the float chamber (5)
While the flow of fuel from the fuel tank to the fuel tank (2) is released, when the engine (E) is stopped, the negative pressure operating force in the negative pressure operating chamber (12) is lost and the tension of the valve spring (17) is reduced. As a result, the valve body (15) opens the valve opening (14) of the oil passage chamber (16) to transfer the fuel in the float chamber (5) to the fuel return passage (7) and the negative pressure cock (8).
A drain device for a carburetor of a gasoline engine, characterized in that the drain device is configured to flow down to and return to the fuel tank (2) through the oil passage chamber (16).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP21841894A JPH0882247A (en) | 1994-09-13 | 1994-09-13 | Drain device for carburetor of gasoline engine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP21841894A JPH0882247A (en) | 1994-09-13 | 1994-09-13 | Drain device for carburetor of gasoline engine |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH0882247A true JPH0882247A (en) | 1996-03-26 |
Family
ID=16719608
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP21841894A Pending JPH0882247A (en) | 1994-09-13 | 1994-09-13 | Drain device for carburetor of gasoline engine |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0882247A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2010048232A (en) * | 2008-08-25 | 2010-03-04 | Honda Motor Co Ltd | Fuel supply device of engine |
-
1994
- 1994-09-13 JP JP21841894A patent/JPH0882247A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2010048232A (en) * | 2008-08-25 | 2010-03-04 | Honda Motor Co Ltd | Fuel supply device of engine |
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