JPH0740685Y2 - Membrane fuel pump device for engine - Google Patents
Membrane fuel pump device for engineInfo
- Publication number
- JPH0740685Y2 JPH0740685Y2 JP6302189U JP6302189U JPH0740685Y2 JP H0740685 Y2 JPH0740685 Y2 JP H0740685Y2 JP 6302189 U JP6302189 U JP 6302189U JP 6302189 U JP6302189 U JP 6302189U JP H0740685 Y2 JPH0740685 Y2 JP H0740685Y2
- Authority
- JP
- Japan
- Prior art keywords
- pressure
- chamber
- engine
- fuel
- membrane
- 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.)
- Expired - Fee Related
Links
Description
【考案の詳細な説明】 （産業上の利用分野） 本考案はエンジンのクランクケースに発生するパルス圧
を使用して燃料タンクの燃料を気化器に送り込む膜式燃
料ポンプ装置に関するものである。DETAILED DESCRIPTION OF THE INVENTION (Industrial field of application) The present invention relates to a membrane fuel pump device for sending fuel in a fuel tank to a carburetor by using pulse pressure generated in an engine crankcase.
（従来の技術） 膜式燃料ポンプは構造が簡単であり、且つ駆動に機械的
損失を伴わないことから、軽自動車、農業機械などの２
サイクルエンジンの燃料供給手段に広く利用されている
ことは周知の通りである。(Prior Art) Since a membrane fuel pump has a simple structure and does not involve mechanical loss in driving, it can be used in light vehicles, agricultural machinery, etc.
It is well known that it is widely used as fuel supply means for cycle engines.
そして、膜式燃料ポンプはエンジンのクランクケースに
発生するパルス圧をパルス圧室に導いて受圧膜を往復動
させることにより反対側のポンプ室を交互に負圧、正圧
とし、燃料タンクの燃料を負圧時に吸込んで正圧時に気
化器へ向かって吐出するものである。パルス圧はエンジ
ン運転状態、即ち絞り弁開度によって異なるもので、絞
り弁全開時の正圧は最高値が約0,5kg/cm2以下であり、
受圧膜は一般に基布入りゴム膜で作られていて前記のパ
ルス圧に充分耐えることができる。Then, the membrane fuel pump guides the pulse pressure generated in the crankcase of the engine to the pulse pressure chamber to reciprocate the pressure receiving membrane so that the pump chamber on the opposite side is alternately made to have a negative pressure and a positive pressure. Is sucked at the time of negative pressure and discharged toward the carburetor at the time of positive pressure. The pulse pressure varies depending on the engine operating state, that is, the throttle valve opening, and the maximum positive pressure when the throttle valve is fully opened is about 0.5 kg / cm 2 or less.
The pressure receiving film is generally made of a rubber film containing a base cloth and can sufficiently withstand the above pulse pressure.
しかしながら、エンジンがバックファイヤを発生したと
き、クランクケース内の圧力は約4kg/cm2にも達するこ
とがあり、このような高い圧力がパルス圧室に導かれる
と受圧膜が破れるという危険がある。However, when the engine backfires, the pressure inside the crankcase can reach up to about 4 kg / cm 2 , and there is a risk that the pressure receiving membrane will break if such high pressure is introduced into the pulse pressure chamber. .
（考案が解決しようとする課題） 本考案はパルス圧室にバックファイヤ発生に伴う異常に
高い圧力が導入されたとき受圧膜を破損する心配があ
る、という前記技術的課題の解決を計ったものであっ
て、パルス圧室に高い圧力が導入されても受圧膜を破損
させる心配がないエンジンの膜式燃料ポンプ装置を提供
することを目的としている。(Problems to be Solved by the Invention) The present invention has been made to solve the above technical problem that there is a risk of damaging the pressure receiving membrane when an abnormally high pressure due to backfire is introduced into the pulse pressure chamber. It is an object of the present invention to provide an engine membrane fuel pump device for an engine that does not worry about damaging the pressure receiving membrane even when high pressure is introduced into the pulse pressure chamber.
（課題を解決するための手段） エンジンのクランクケースに接続されたパルス圧室と、
燃料タンクおよび気化器に入口弁および出口弁を経て接
続されたポンプ室と、前記パルス圧室とポンプ室とを仕
切った受圧膜とを具えているエンジンの膜式燃料ポンプ
装置がもっている前記技術的課題を解決するため、本考
案はパルス圧室を設定圧力以上の圧力で開く高圧安全弁
を有する圧力放出路によって気化器の入口に接続する、
という手段を講じた。(Means for Solving the Problem) A pulse pressure chamber connected to the crankcase of the engine,
The above-mentioned technique having a membrane fuel pump device for an engine, which includes a pump chamber connected to a fuel tank and a carburetor through an inlet valve and an outlet valve, and a pressure-receiving membrane that divides the pulse pressure chamber and the pump chamber. In order to solve the technical problem, the present invention connects the pulse pressure chamber to the inlet of the carburetor by a pressure release passage having a high pressure safety valve that opens at a pressure higher than a set pressure.
I took the measure.
（作用） エンジンの運転に伴ってクランクケースに発生するパル
ス圧がパルス圧室に導入され、その負圧時に燃料タンク
の燃料をポンプ室に吸込み正圧時にポンプ室の燃料を加
圧して気化器に送る。パルス圧室に導入される圧力が設
定圧力以上の場合は高圧安全弁が開いて高圧空気を気化
器の入口に放出する。(Function) The pulse pressure generated in the crankcase due to the operation of the engine is introduced into the pulse pressure chamber, the fuel in the fuel tank is sucked into the pump chamber when the negative pressure is generated, and the fuel in the pump chamber is pressurized when the positive pressure is applied to the carburetor. Send to. When the pressure introduced into the pulse pressure chamber is equal to or higher than the set pressure, the high pressure safety valve is opened and the high pressure air is discharged to the inlet of the vaporizer.
（実施例） 図面を参照して本考案の実施例を説明すると、エアクリ
ーナ１から吸込んだ空気に気化器２で燃料を混合しエン
ジン３に供給し、その一方で燃料タンク４の燃料を膜式
燃料ポンプ５を経て気化器２に送るようになっている。(Embodiment) An embodiment of the present invention will be described with reference to the drawings. Air sucked from an air cleaner 1 is mixed with fuel in a carburetor 2 and supplied to an engine 3, while fuel in a fuel tank 4 is supplied by a membrane type. It is designed to be sent to the carburetor 2 via the fuel pump 5.
膜式燃料ポンプ５は受圧膜７を挟んで形成されたパルス
圧室６およびポンプ室８と、ポンプ室８に入口弁10を経
て連通する入口室９および出口弁12を経て連通する出口
室11と、入口室９および出口室11と仕切膜13を隔てて設
けられた空気室14とを有している。そして、エンジン３
のクランクケースに発生するパルス圧が圧力導管15を通
ってパルス圧室６に導入され、その負圧時に受圧膜７を
パルス圧室６の方へ吸引してポンプ室８を負圧とし入口
弁10を開いて入口室９の燃料をポンプ室８に吸込み、正
圧時に受圧膜７をポンプ室８の方へ押して出口弁12を開
きポンプ室８の燃料を出口室11から燃料導管17を経て気
化器２に送り、また燃料タンク４の燃料は供給導管16を
通って入口室９に入ることは従来品と同じである。The membrane fuel pump 5 has a pulse pressure chamber 6 and a pump chamber 8 formed with a pressure receiving membrane 7 sandwiched between them, an inlet chamber 9 communicating with the pump chamber 8 via an inlet valve 10, and an outlet chamber 11 communicating with the outlet valve 12. And an air chamber 14 provided with the partition membrane 13 separated from the inlet chamber 9 and the outlet chamber 11. And engine 3
The pulse pressure generated in the crankcase is introduced into the pulse pressure chamber 6 through the pressure conduit 15, and at the time of the negative pressure, the pressure receiving membrane 7 is sucked toward the pulse pressure chamber 6 to make the pump chamber 8 a negative pressure and the inlet valve 10 is opened to suck the fuel in the inlet chamber 9 into the pump chamber 8, and when the positive pressure is applied, the pressure receiving membrane 7 is pushed toward the pump chamber 8 to open the outlet valve 12 and the fuel in the pump chamber 8 is passed from the outlet chamber 11 through the fuel conduit 17. As in the prior art, the fuel sent to the vaporizer 2 and the fuel in the fuel tank 4 enters the inlet chamber 9 through the supply conduit 16.
パルス圧室６は気化器２の入口に設けられているエアク
リーナ１の内部に圧力放出路18によって接続されてお
り、弁座19に閉止ばね20のばね力によって弁体21を着座
させた逆止弁構造の高圧安全弁22が圧力放出路18に設け
られている。この高圧安全弁22の閉止ばね20のばね荷重
は、パルス圧が正常な正圧のときは弁体21を弁座19に着
座させているが、バックファイヤが発生して異常に高い
圧力がパルス圧室６に導入されたときは弁体21を弁座19
から離間させるように適宜の値に設定されている。従っ
て、バックファイヤに伴ってパルス圧室６に導入された
高圧空気は圧力放出路18を通ってエアクリーナ１の内部
に放出され、受圧膜７を高い圧力で押して破くという危
険を解消する。The pulse pressure chamber 6 is connected to the inside of the air cleaner 1 provided at the inlet of the carburetor 2 by the pressure release passage 18, and the valve seat 21 is seated on the valve seat 19 by the spring force of the closing spring 20. A high-pressure safety valve 22 having a valve structure is provided in the pressure release passage 18. The spring load of the closing spring 20 of the high-pressure safety valve 22 causes the valve body 21 to be seated on the valve seat 19 when the pulse pressure is a normal positive pressure. When it is introduced into the chamber 6, the valve body 21 is moved to the valve seat 19
Is set to an appropriate value so as to be separated from. Therefore, the high-pressure air introduced into the pulse pressure chamber 6 along with the backfire is released into the air cleaner 1 through the pressure release passage 18 and eliminates the risk of pushing the pressure receiving film 7 with a high pressure to break it.
また、クランクケースからパルス圧室６に導入される高
圧空気は燃料や潤滑油を含んでいるが、これらは気化器
２の入口に導かれてエンジン３に吸込まれ大気中に放出
されないので大気汚染の心配がない。Further, the high-pressure air introduced from the crankcase into the pulse pressure chamber 6 contains fuel and lubricating oil, but these are guided to the inlet of the carburetor 2 and sucked into the engine 3 so as not to be released into the atmosphere, so air pollution. No worries.
（考案の効果） 本考案によると、パルス圧室を気化器の入口に圧力放出
路をもって接続し、異常な高圧力がパルス圧室に導入さ
れたとき開く高圧安全弁で高圧空気を放出するようにし
たので、バックファイヤが発生したとき受圧膜が高圧を
受けても破れるという危険がなく、正常なポンプ機能を
失わせない。また、燃料や潤滑油を含んだ高圧空気は気
化器の入口からエンジンに吸込まれるので大気汚染の心
配なく処理できるものである。(Effect of the Invention) According to the present invention, the pulse pressure chamber is connected to the inlet of the carburetor with the pressure discharge passage, and high pressure air is discharged by the high pressure safety valve that opens when abnormal high pressure is introduced into the pulse pressure chamber. Therefore, when backfire occurs, there is no risk that the pressure receiving membrane will be broken even if it receives high pressure, and the normal pump function is not lost. Further, the high-pressure air containing fuel and lubricating oil is sucked into the engine from the inlet of the carburetor, so that it can be treated without fear of air pollution.
図面は本考案の実施例を示す断面配置図である。 ２……気化器、３……エンジン、４……燃料タンク、５
……膜式燃料ポンプ、６……パルス圧室、７……受圧
膜、８……ポンプ室、10……入口弁、12……出口弁、18
……圧力放出路、22……高圧安全弁、The drawings are cross-sectional layout views showing an embodiment of the present invention. 2 ... Vaporizer, 3 ... Engine, 4 ... Fuel tank, 5
...... Membrane fuel pump, 6 ...... Pulse pressure chamber, 7 …… Pressure receiving membrane, 8 …… Pump chamber, 10 …… Inlet valve, 12 …… Outlet valve, 18
...... Pressure release path, 22 ...... High pressure safety valve,
Claims (1)
ルス圧室と、燃料タンクおよび気化器に入口弁および出
口弁を経て接続されたポンプ室と、前記パルス圧室とポ
ンプ室とを仕切った受圧膜とを具えているエンジンの膜
式燃料ポンプ装置において、前記パルス圧室が設定圧力
以上の圧力で開く高圧安全弁を有する圧力放出路によっ
て気化器の入口に接続されていることを特徴とする膜式
燃料ポンプ装置。1. A pulse pressure chamber connected to a crankcase of an engine, a pump chamber connected to a fuel tank and a carburetor through an inlet valve and an outlet valve, and a pressure receiving member separating the pulse pressure chamber and the pump chamber. A membrane fuel pump device for an engine comprising a membrane, wherein the pulse pressure chamber is connected to an inlet of a carburetor by a pressure release passage having a high-pressure safety valve that opens at a pressure equal to or higher than a set pressure. Type fuel pump device.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP6302189U JPH0740685Y2 (en) | 1989-05-31 | 1989-05-31 | Membrane fuel pump device for engine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP6302189U JPH0740685Y2 (en) | 1989-05-31 | 1989-05-31 | Membrane fuel pump device for engine |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH035970U JPH035970U (en) | 1991-01-21 |
| JPH0740685Y2 true JPH0740685Y2 (en) | 1995-09-20 |
Family
ID=31592702
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP6302189U Expired - Fee Related JPH0740685Y2 (en) | 1989-05-31 | 1989-05-31 | Membrane fuel pump device for engine |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0740685Y2 (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2010090846A (en) * | 2008-10-09 | 2010-04-22 | Honda Motor Co Ltd | Diaphragm fuel pump for engine |
-
1989
- 1989-05-31 JP JP6302189U patent/JPH0740685Y2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JPH035970U (en) | 1991-01-21 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| LAPS | Cancellation because of no payment of annual fees |