JPS61229965A - Variable venturi carburetor - Google Patents

Variable venturi carburetor

Info

Publication number
JPS61229965A
JPS61229965A JP7097885A JP7097885A JPS61229965A JP S61229965 A JPS61229965 A JP S61229965A JP 7097885 A JP7097885 A JP 7097885A JP 7097885 A JP7097885 A JP 7097885A JP S61229965 A JPS61229965 A JP S61229965A
Authority
JP
Japan
Prior art keywords
fuel
piston
suction
pressure chamber
chamber
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
JP7097885A
Other languages
Japanese (ja)
Inventor
Hiroyuki Ueda
弘之 植田
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.)
Hitachi Ltd
Original Assignee
Hitachi Ltd
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 Hitachi Ltd filed Critical Hitachi Ltd
Priority to JP7097885A priority Critical patent/JPS61229965A/en
Publication of JPS61229965A publication Critical patent/JPS61229965A/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
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M7/00—Carburettors with means for influencing, e.g. enriching or keeping constant, fuel/air ratio of charge under varying conditions
    • F02M7/12—Other installations, with moving parts, for influencing fuel/air ratio, e.g. having valves
    • F02M7/14—Other installations, with moving parts, for influencing fuel/air ratio, e.g. having valves with means for controlling cross-sectional area of fuel spray nozzle
    • F02M7/16—Other installations, with moving parts, for influencing fuel/air ratio, e.g. having valves with means for controlling cross-sectional area of fuel spray nozzle operated automatically, e.g. dependent on exhaust-gas analysis
    • F02M7/17—Other installations, with moving parts, for influencing fuel/air ratio, e.g. having valves with means for controlling cross-sectional area of fuel spray nozzle operated automatically, e.g. dependent on exhaust-gas analysis by a pneumatically adjustable piston-like element, e.g. constant depression carburettors

Abstract

PURPOSE:To drawn out the fuel intruded in a piston chamber and atomize it efficiently by providing a pipe communicating the atmospheric pressure chamber of piston with the directly downstream side of a throttle valve in a sliding piston type carburetor in which a piston sliding horizontally and being at right angles to a horizontally arranged suction pipe line is provided. CONSTITUTION:In a sliding piston type carburetor 2 in which a suction pipe line 6 is horizontally arranged and a piston 8 is provided to slide horizontally and to be at right angles to the suction pipe line 6 thereof, there are cases where the fuel jetted from a fuel nozzle in the suction line intrudes into the atmospheric pressure chamber 10 of the piston 8. Therefore, the atmospheric pressure chamber 10 is communicated with a nozzle 9 at the directly downstream side of a throttle valve 16 by a pipe 14 so that the fuel intruded in the chamber 10 can be securely drawn out by a large negative pressure generated at the throttle valve 16 part and the fuel from the nozzle 9 can be securely atomized.

Description

【発明の詳細な説明】 〔発明の利用分野〕 本発明は、特にサクションピストンがほぼ水平方向に摺
動し空気もほぼ水平方向に流れる内燃機関の燃料供給装
置の可変ベンチュリ気化器の改良に関するものである。[Detailed Description of the Invention] [Field of Application of the Invention] The present invention particularly relates to an improvement in a variable venturi carburetor for a fuel supply system for an internal combustion engine in which a suction piston slides in a substantially horizontal direction and air also flows in a substantially horizontal direction. It is.

〔発明の背景〕[Background of the invention]

この種のベンチュリ気化器に関連するものとして、実開
昭５７−１０３３４５、同５８−１４２３５２．同５８
−１５６１５０が知られている。サクションピストンが
ほぼ水平方向に摺動する可変ベンチュリ気化器において
は、サクションチャンバ内に入り込んだ燃料はこのサク
ションチャンバ内に溜まり、サクションピストンの作動
抵抗になったり、サクションピストンとサクションチャ
ンバとの間の微少隙間に入り込み、その部分のニアリー
ク量を変化させたりして作動精度をばらつかせる要因と
なっている。Related to this type of venturi carburetor are Utility Model Applications No. 57-103345 and No. 58-142352. Same 58
-156150 is known. In a variable venturi carburetor in which the suction piston slides almost horizontally, fuel that has entered the suction chamber accumulates in the suction chamber, creating resistance to the operation of the suction piston or creating a barrier between the suction piston and the suction chamber. It gets into minute gaps and changes the amount of near leakage in that area, causing variations in operating accuracy.

〔発明の目的〕[Purpose of the invention]

本発明は上記の状況に鑑みなされたものであり、サクシ
ョンチャンバ内に燃料が溜ることを防止するとともに該
サクションチャンバ内のこの燃料がスロットルボア部分
で効率よく変化できる可変べンチュリ気化器を提供する
ことを目的としたものである。The present invention has been made in view of the above situation, and provides a variable venturi carburetor that prevents fuel from accumulating in the suction chamber and allows the fuel in the suction chamber to be efficiently changed at the throttle bore portion. It is intended for this purpose.

〔発明の概要〕[Summary of the invention]

本発明の可変ベンチュリ気化器は、ほぼ水平方向に空気
が流れるベンチュリ部に連通されたサクションチャンバ
内の負圧室と、該負圧室及び大気圧室の差圧及びばねに
より駆動されほぼ水平方向に変位し上記ベンチュリ部の
面積を変化させるサクションピストンと、該サクション
ピストン先端中央に該サクションピストンの前進方向に
突設しメインノズルに挿入され該メインノズルから上記
ベンチュリ部に噴出される燃料を制御するジェットニー
ドルとを設けてなり、上記サクションチャンバ内負圧室
最下部及びスロットルボア間を連通ずるように形成され
た燃料抜き通路と、該スロットルボア内壁面より突出す
るように該燃料抜き通路端部に形成されたノズルとを設
けたものである。The variable venturi vaporizer of the present invention is driven by a negative pressure chamber in a suction chamber communicating with a venturi portion through which air flows in a substantially horizontal direction, and a pressure difference between the negative pressure chamber and the atmospheric pressure chamber and a spring. a suction piston that is displaced to change the area of the venturi portion, and a suction piston that is provided at the center of the tip of the suction piston and protrudes in the forward direction of the suction piston and is inserted into a main nozzle to control the fuel that is injected from the main nozzle to the venturi portion. a fuel vent passage formed to communicate between the lowermost part of the negative pressure chamber in the suction chamber and the throttle bore; and an end of the fuel vent passage protruding from the inner wall surface of the throttle bore. It is provided with a nozzle formed in the section.

〔発明の実施例〕[Embodiments of the invention]

以下本発明の可変ベンチュリ気化器を実施例を用い第１
図により説明する。第１図は断面図である１図において
、１は気化器本体、２はサクションチャンバ、３はフロ
ートチャンバ、４はメインノズル、５はジェットニード
ル、６はベンチュリ部、７はサクションチャンバ２内に
形成された負気室、９はスロットルボア１８に配設され
スロットルバルブ１６の下流側で燃料抜き通路１４端部
に取り付けられ壁面より突設されたノズルである。Hereinafter, the variable venturi carburetor of the present invention will be described as follows.
This will be explained using figures. Figure 1 is a cross-sectional view. In Figure 1, 1 is the carburetor main body, 2 is the suction chamber, 3 is the float chamber, 4 is the main nozzle, 5 is the jet needle, 6 is the venturi part, and 7 is the inside of the suction chamber 2. The formed negative air chamber 9 is a nozzle disposed in the throttle bore 18, attached to the end of the fuel drain passage 14 on the downstream side of the throttle valve 16, and protruding from the wall surface.

そして、ベンチュリ部６は空気が水平方向に流れるよう
に形成されサクションホール１５を介し負圧室７に連通
されてｊＮる。８はサクションピストンで負圧室７及び
大気圧室１０の差圧及びばね１７の張力により駆動され
常時はね１７の張力によりベンチュリ部６の断面積を縮
少（前進）する方向に付勢されている。ジェットニード
ル５はサクションピストン８の先端面中央にサクション
ピストン８の前進方向へ突設され、メインノズル４に挿
入されメインノズル４からベンチュリ部６に噴出される
燃料量を制御するようになっている。The venturi portion 6 is formed so that air flows horizontally, and is communicated with the negative pressure chamber 7 via the suction hole 15. A suction piston 8 is driven by the pressure difference between the negative pressure chamber 7 and the atmospheric pressure chamber 10 and the tension of a spring 17, and is constantly urged by the tension of the spring 17 in a direction to reduce (advance) the cross-sectional area of the venturi portion 6. ing. The jet needle 5 is provided at the center of the tip surface of the suction piston 8 to protrude in the forward direction of the suction piston 8, and is inserted into the main nozzle 4 to control the amount of fuel jetted from the main nozzle 4 to the venturi section 6. .

尚、１１はフロート、１２はメインジェット、１３は混
合管である□。また、燃料抜き通路１４は負圧室７の最
下底部とスロットルバルブ１６の下流側とを連通してい
る。In addition, 11 is a float, 12 is a main jet, and 13 is a mixing tube. Further, the fuel vent passage 14 communicates the lowest bottom portion of the negative pressure chamber 7 with the downstream side of the throttle valve 16 .

そして、ベンチュリ部６を通過する空気により発生され
た負圧が、サクションホール１５を介しサクションチャ
ンバ２の負圧室７側に導かれ、大気圧室１０と負圧室７
の差圧によりばね１７を圧縮しサクションピストン７が
矢印方向に後退する。Then, the negative pressure generated by the air passing through the venturi section 6 is guided to the negative pressure chamber 7 side of the suction chamber 2 through the suction hole 15, and the negative pressure chamber 7 is introduced into the atmospheric pressure chamber 10 and the negative pressure chamber 7 side.
The differential pressure causes the spring 17 to be compressed and the suction piston 7 to retreat in the direction of the arrow.

従って、ジェットニードル５とメインノズル４とにより
計量された燃料がベンチュリ部６に噴出する。ベンチュ
リ部６に噴出された燃料の一部はサクションホール１５
やサクションピストン８及び気化器本体１の隙間からサ
クションチャンバ２内に入り下部に溜まる。この溜った
燃料はスロットルバルブ１６下流の負圧によって吸引さ
れ燃料抜き通路１４を経て詳細を第２図に示すノズル９
より噴出する。ノズル９には、絞りを設け、スロットル
バルブ１６下流の負圧変化がサクションピストン８の作
動に影響しないようになっている。また、ノズル９は、
突出形成されているため、先端から燃料が噴出すると同
時に散乱し霧化し易く混合気の質を向上できるようにな
っている。第３図。Therefore, the fuel metered by the jet needle 5 and the main nozzle 4 is injected into the venturi section 6. A portion of the fuel injected into the venturi section 6 is transferred to the suction hole 15.
It enters the suction chamber 2 through the gap between the suction piston 8 and the carburetor body 1 and accumulates in the lower part. This accumulated fuel is sucked by the negative pressure downstream of the throttle valve 16 and passes through the fuel vent passage 14 to the nozzle 9 whose details are shown in FIG.
More gushing. The nozzle 9 is provided with a throttle so that negative pressure changes downstream of the throttle valve 16 do not affect the operation of the suction piston 8. Moreover, the nozzle 9 is
Because it is formed protrudingly, when the fuel is ejected from the tip, it is easily scattered and atomized, improving the quality of the air-fuel mixture. Figure 3.

第４図はそれぞれノズル９の取付構ｉの他の実施例であ
り、第３図は下流側にノズル９を傾け、第４図は下流側
のみに開口を設けたものであり、それぞれ効果よく燃料
微粒化ができるようになっている。Fig. 4 shows other embodiments of the mounting structure i of the nozzle 9. Fig. 3 shows the nozzle 9 tilted toward the downstream side, and Fig. 4 shows an opening provided only on the downstream side. It is now possible to atomize fuel.

このように本実施例の可変ベンチュリ気化器は、サクシ
ョンチャンバ内負圧室最下部及びスロットルバルブ下流
部間を連通ずるように燃料抜き通路を設け、この燃料抜
き通路の端部にノズルを固定しこのノズルをスロットル
バルブ下流のスロットルボア内壁面より突出させたので
、サクションチャンバ内に燃料の溜りをなくすことが可
能でサクションピストンの作動精度を上げることができ
、かつ、ノズルから燃料が噴出する際に先端で散乱し霧
化し易く混合気の質を向上できる。特に水平通風の気圧
器では、この燃料抜き通路の出口をスロットルボア下部
に設けると通路の長さが最短となり、製作上、性能上最
適であるが、このような場合、スロットルボア中の燃料
抜き通路出口を通遇する壁面流となった燃料が燃料抜き
通路に逆に入り込むことをノズルを突き出すことにより
防ぐことができる。In this way, the variable venturi carburetor of this embodiment is provided with a fuel vent passage that communicates between the lowest part of the negative pressure chamber in the suction chamber and the downstream part of the throttle valve, and the nozzle is fixed to the end of this fuel vent passage. Since this nozzle protrudes from the inner wall surface of the throttle bore downstream of the throttle valve, it is possible to eliminate fuel accumulation in the suction chamber, increasing the operating accuracy of the suction piston. It is easily scattered at the tip and atomized, improving the quality of the mixture. Particularly in horizontally ventilated pneumatic pressurizers, providing the outlet of this fuel vent passage at the bottom of the throttle bore minimizes the length of the passage and is optimal in terms of manufacturing and performance. By protruding the nozzle, it is possible to prevent the wall flow of fuel passing through the passage outlet from entering the fuel removal passage.

〔発明の効果〕〔Effect of the invention〕

以上記述した如く本発明の可変ベンチュリ気化器は、サ
クションチャンバ内に燃料が溜ることを防止するととも
に該サクションチャンバ内のこの燃料がスロットルボア
部分で効率よく一化できる効果を有するものである。As described above, the variable venturi carburetor of the present invention has the effect of preventing fuel from accumulating in the suction chamber and efficiently consolidating the fuel in the suction chamber at the throttle bore portion.

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

第１図は本発明の可変ベンチュリ気化器の実施例の断面
図、第２図は第１図のＡ部詳細図、第３図、第４図はそ
れぞれ第２図と同部分のノズル部の他の実施例の詳細図
である。 ２・・・サクションチャンバ、４・・・メインノズル、
５・・・ジェットニードル、６・・・ベンチュリ部、７
・・・負圧室、８・・・サクションピストン、９・・・
ノズル、１０・・・大気圧室、１４・・・燃料抜き通路
、１７・・・ばね、１８・・・スロットルボア。Fig. 1 is a sectional view of an embodiment of the variable venturi carburetor of the present invention, Fig. 2 is a detailed view of part A in Fig. 1, and Figs. 3 and 4 are the same parts of the nozzle section as Fig. FIG. 6 is a detailed view of another embodiment. 2... Suction chamber, 4... Main nozzle,
5...Jet needle, 6...Venturi part, 7
...Negative pressure chamber, 8...Suction piston, 9...
Nozzle, 10... Atmospheric pressure chamber, 14... Fuel vent passage, 17... Spring, 18... Throttle bore.

Claims (1)

【特許請求の範囲】[Claims] １、ほぼ水平方向に空気が流れるベンチユリ部に連通さ
れたサクションチャンバ内の負圧室と、該負圧室及び大
気圧室の差圧及びばねにより駆動されほぼ水平方向に変
位し上記ベンチユリ部の面積を変化させるサクションピ
ストンと、該サクションピストン先端中央に該サクショ
ンピストンの前進方向に突設しメインノズルに挿入され
該メインノズルから上記ベンチユリ部に噴射される燃料
を制御するジェットニードルとを設けたものにおいて、
上記サクションチャンバ内負圧室最下部及びスロットル
ボア間を連通するように形成された燃料抜き通路と、該
スロットルボア内壁より突出するように該燃料抜き通路
端部に形成されたノズルとを設けたことを特徴とする可
変ベンチユリ気化器。1. The negative pressure chamber in the suction chamber, which is connected to the bench lily through which air flows in a substantially horizontal direction, is driven by the differential pressure between the negative pressure chamber and the atmospheric pressure chamber, and a spring to displace the bench lily in a substantially horizontal direction. A suction piston that changes the area, and a jet needle that is protruded from the center of the tip of the suction piston in the forward direction of the suction piston, is inserted into the main nozzle, and controls the fuel injected from the main nozzle to the bench lily portion. In things,
A fuel vent passage formed to communicate between the lowermost part of the negative pressure chamber in the suction chamber and the throttle bore, and a nozzle formed at an end of the fuel vent passage so as to protrude from the inner wall of the throttle bore. A variable bench lily vaporizer characterized by:
JP7097885A 1985-04-05 1985-04-05 Variable venturi carburetor Pending JPS61229965A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP7097885A JPS61229965A (en) 1985-04-05 1985-04-05 Variable venturi carburetor

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP7097885A JPS61229965A (en) 1985-04-05 1985-04-05 Variable venturi carburetor

Publications (1)

Publication Number Publication Date
JPS61229965A true JPS61229965A (en) 1986-10-14

Family

ID=13447120

Family Applications (1)

Application Number Title Priority Date Filing Date
JP7097885A Pending JPS61229965A (en) 1985-04-05 1985-04-05 Variable venturi carburetor

Country Status (1)

Country Link
JP (1) JPS61229965A (en)

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