JPH0672559B2 - Carburetor throttle valve - Google Patents
Carburetor throttle valveInfo
- Publication number
- JPH0672559B2 JPH0672559B2 JP16559185A JP16559185A JPH0672559B2 JP H0672559 B2 JPH0672559 B2 JP H0672559B2 JP 16559185 A JP16559185 A JP 16559185A JP 16559185 A JP16559185 A JP 16559185A JP H0672559 B2 JPH0672559 B2 JP H0672559B2
- Authority
- JP
- Japan
- Prior art keywords
- valve
- throttle valve
- pivot shaft
- valve body
- intake passage
- 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
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D9/00—Controlling engines by throttling air or fuel-and-air induction conduits or exhaust conduits
- F02D9/08—Throttle valves specially adapted therefor; Arrangements of such valves in conduits
- F02D9/10—Throttle valves specially adapted therefor; Arrangements of such valves in conduits having pivotally-mounted flaps
- F02D9/1005—Details of the flap
- F02D9/102—Details of the flap the flap having movable parts fixed onto it
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Control Of Throttle Valves Provided In The Intake System Or In The Exhaust System (AREA)
Description
【発明の詳細な説明】 （産業上の利用分野） この発明は、車両等のエンジンの吸気ポートに連結され
る気化器に関し、より詳しくは、混合気の流量を調整す
る気化器のスロットル弁に関する。Description: TECHNICAL FIELD The present invention relates to a carburetor connected to an intake port of an engine of a vehicle or the like, and more specifically to a throttle valve of a carburetor for adjusting a flow rate of an air-fuel mixture. .
（従来の技術） 一般に、車両等のエンジンの吸気側には、燃料を霧化し
て空気と混合させるために気化器が設けられ、この気化
器はその吸気通路に上記混合気の流量を調整するバタフ
ライ式スロットル弁を有している。そして、この種のス
ロットル弁は吸気通路を横切るように設けられる枢支軸
と、この枢支軸に支持される弁本体とで構成されてい
る。(Prior Art) Generally, on the intake side of an engine of a vehicle or the like, a carburetor is provided for atomizing fuel and mixing it with air, and this carburetor adjusts the flow rate of the mixture in its intake passage. It has a butterfly throttle valve. A throttle valve of this type is composed of a pivot shaft provided so as to cross the intake passage, and a valve body supported by the pivot shaft.
上記車両が例えば下り坂を走行してエンジンの回転数が
高くなるとき、スロットル弁を全閉にすると、吸気負圧
が高くなるといういわゆるエンジンブレーキ状態とな
る。このような場合、上記混合気の燃料混合比が可燃範
囲外となって、エンジン内における燃焼が中断されるこ
とがある。この場合には、エンジンから未然ガスが排出
されるので、生ガスを伴うミスファイアとなり、また排
気管内で着火した場合は爆発音を発生する等の不具合を
生じる。When the vehicle is traveling downhill and the engine speed becomes high, for example, when the throttle valve is fully closed, the intake negative pressure becomes high, which is a so-called engine braking state. In such a case, the fuel mixture ratio of the air-fuel mixture may fall outside the flammable range, and combustion in the engine may be interrupted. In this case, gas is discharged from the engine before it becomes misfire accompanied by raw gas, and when ignited in the exhaust pipe, an explosion sound is generated.
そこで、上記のような不具合を防止するために、上記ス
ロットル弁の弁本体の一方の回動端側にエンジンブレー
キ時の吸気負圧で開く別体のリード弁を設け、これによ
り適当な燃料濃度の混合気をエンジンに供給して、燃焼
の中断を防止させるようにしたものがある（例えば、実
公昭45-18244号公報）。Therefore, in order to prevent the above-mentioned problems, a separate reed valve that is opened by the intake negative pressure during engine braking is provided on one side of the turning end of the valve body of the throttle valve. There is a system in which the mixture of air is supplied to the engine to prevent the interruption of combustion (for example, Japanese Utility Model Publication No. 45-18244).
（発明が解決しようとする問題点） ところで、上記従来構成は、枢支軸や弁本体とは別体に
リード弁を設けたものであるため、このスロットル弁の
構成は複雑で、その組立も煩雑である。(Problems to be Solved by the Invention) By the way, in the above-mentioned conventional configuration, since the reed valve is provided separately from the pivot shaft and the valve body, the configuration of this throttle valve is complicated, and its assembly is also difficult. It is complicated.
また、枢支軸を中心に回動する弁本体の一方の回動端側
に上記リード弁を設けたため、スロットル弁の重心が枢
支軸に対してリード弁側へ偏り、スロットル弁の重量バ
ランスが狂うこととなる。このため、例えば、自動二輪
車でスロットルグリップを操作してスロットル弁を開閉
操作する場合、上記重量バランスの狂いにより、スロッ
トル弁の慣性重量が増加し、これはスロットルグリップ
の操作性の点で好ましくない。Further, since the reed valve is provided on one side of the turning end of the valve body that rotates about the pivot shaft, the center of gravity of the throttle valve is biased toward the reed valve side with respect to the pivot shaft, and the weight balance of the throttle valve is increased. Will go crazy. Therefore, for example, when the throttle grip is operated in a motorcycle to open / close the throttle valve, the inertial weight of the throttle valve increases due to the imbalance of the weight, which is not preferable in terms of the operability of the throttle grip. .
（発明の目的） この発明は、上記のような事情に注目してなされたもの
で、気化器の下流側が高吸気負圧状態となったときに、
ここに自動的に空気を送り込んで燃料と空気との混合比
を可燃範囲内とさせるスロットル弁を簡単な構成にする
と共に、組立を容易とし、かつ、スロットル弁の重量バ
ランスを良好に保つことによってスロットル弁の開閉操
作が円滑にできるようにすることを目的とする。(Object of the Invention) The present invention has been made by paying attention to the above circumstances, and when the downstream side of the carburetor is in a high intake negative pressure state,
A simple structure of the throttle valve that automatically feeds air to make the mixing ratio of fuel and air within the combustible range, facilitates assembly, and keeps the weight balance of the throttle valve good. The purpose is to enable smooth opening and closing of the throttle valve.
（発明の構成） 上記目的を達成するためのこの発明の特徴とするところ
は、弁本体に貫通孔を形成し、吸気負圧でこの貫通孔を
開とする弁板を設け、この弁板と上記弁本体とを枢支軸
に共締めした点にある。(Structure of the Invention) A feature of the present invention for achieving the above object is that a through hole is formed in a valve body, and a valve plate that opens this through hole by negative pressure of intake air is provided. The point is that the valve body and the valve body are fastened together to the pivot shaft.
（実施例） 以下、この発明の実施例を図面により説明する。Embodiment An embodiment of the present invention will be described below with reference to the drawings.
１は固定ベンチュリ式の気化器で、図示しないが例えば
自動二輪車に搭載されるエンジンの吸気ポートに連結さ
れる。Reference numeral 1 denotes a fixed venturi-type carburetor, which is connected to an intake port of an engine mounted on a motorcycle (not shown), for example.
上記気化器１は断面円形の吸気通路２を有し、この吸気
通路２がエンジンの吸気ポートに連通される。また、上
記吸気通路２内にはベンチュリ部３が形成され、このベ
ンチュリ部３にフロート室４と連通するメインノズル５
が設けられる。The carburetor 1 has an intake passage 2 having a circular cross section, and the intake passage 2 communicates with an intake port of the engine. Further, a venturi portion 3 is formed in the intake passage 2, and a main nozzle 5 communicating with the float chamber 4 is formed in the venturi portion 3.
Is provided.
上記ベンチュリ部３の上流側の吸気通路２にバタフライ
式のチョーク弁７、及び下流側に同じくバタフライ式の
スロットル弁８が設けられる。また、上記スロットル弁
８が吸気通路２を閉じようとするときに、このスロット
ル弁８の回動端近傍で吸気通路２に開口する低速ポート
９が形成される。この低速ポート９はバイパスポート10
と、上記スロットル弁８より下流の吸気通路２に開口さ
れるアイドルポート11とを有しており、この低速ポート
９は図示しないがフロート室４に連通される。A butterfly choke valve 7 is provided in the intake passage 2 on the upstream side of the venturi portion 3, and a butterfly throttle valve 8 is also provided on the downstream side. Further, when the throttle valve 8 tries to close the intake passage 2, a low speed port 9 opening to the intake passage 2 is formed near the pivotal end of the throttle valve 8. This low speed port 9 is bypass port 10
And an idle port 11 opened in the intake passage 2 downstream of the throttle valve 8. The low speed port 9 is connected to the float chamber 4 though not shown.
一方、上記スロットル弁８は吸気通路２を横切る枢支軸
14と、この枢支軸14にねじ止めされてほぼ重心位置を支
持される弁本体13とを有し、上記枢支軸14の回動で弁本
体13が吸気通路２を開閉するように構成される。また、
上記弁本体13には貫通孔15が形成され、吸気負圧でこの
貫通孔15を開とする弁板16が設けられる。On the other hand, the throttle valve 8 is a pivot shaft that crosses the intake passage 2.
14 and a valve body 13 which is screwed to the pivot shaft 14 and supported at a substantially center of gravity position. The valve body 13 opens and closes the intake passage 2 by the rotation of the pivot shaft 14. To be done. Also,
A through hole 15 is formed in the valve body 13, and a valve plate 16 that opens the through hole 15 by negative pressure of intake air is provided.
上記弁本体13と弁板16とを枢支軸14に支持させるための
構成につき説明すると、上記枢支軸14は断面円形でこの
枢支軸14の外周面の一部に切欠平面14aが形成され、こ
の切欠平面14aに一対のねじ孔14b,14bが形成される。一
方、上記弁板16は弾性の金属板で形成されており、基板
16aとこの基板16aから突出する弁板本体16bとで形成さ
れる。そして、上記弁本体13が枢支軸14の切欠平面14a
に嵌入され、この弁本体13と、この弁本体13に重ね合わ
された弁板16とがねじ孔14bにねじ込まれるねじ17で枢
支軸14に共締めされる。18はスプリングワッシャであ
る。Explaining the structure for supporting the valve body 13 and the valve plate 16 on the pivot shaft 14, the pivot shaft 14 has a circular cross section, and a notch plane 14a is formed on a part of the outer peripheral surface of the pivot shaft 14. Then, a pair of screw holes 14b, 14b are formed in the cutout plane 14a. On the other hand, the valve plate 16 is formed of an elastic metal plate,
16a and a valve plate body 16b protruding from the base plate 16a. Then, the valve body 13 is a cutout plane 14a of the pivot shaft 14.
The valve body (13) and the valve plate (16) superposed on the valve body (13) are fastened to the pivot shaft (14) together with the screw (17) screwed into the screw hole (14b). 18 is a spring washer.
そして、エンジンブレーキ状態のような場合には、スロ
ットル弁８が閉じられており、スロットル弁８の下流側
が高吸気負圧状態となる。このため、低速ポート９から
吸気通路２へ燃料が大量に吸入され、燃料濃度の高い混
合気がエンジンへ供給されようとする。Then, in the case of the engine braking state, the throttle valve 8 is closed, and the downstream side of the throttle valve 8 is in the high intake negative pressure state. Therefore, a large amount of fuel is sucked into the intake passage 2 from the low speed port 9, and an air-fuel mixture having a high fuel concentration is about to be supplied to the engine.
しかし、この時にスロットル弁８の弁本体13に設けられ
た弁板16が上記高吸気負圧により弾性変形して自動的に
貫通孔15を開くので、この貫通孔15を通して空気がエン
ジンへ供給される。よって上記低速ポート９から燃料過
濃の混合気が供給されることは防止され、エンジンの不
完全燃料等による生ガスを伴うミスファイアや燃料の中
断を防止することができる。However, at this time, the valve plate 16 provided in the valve body 13 of the throttle valve 8 elastically deforms due to the high intake negative pressure and automatically opens the through hole 15, so that air is supplied to the engine through the through hole 15. It Therefore, it is possible to prevent the fuel-rich air-fuel mixture from being supplied from the low-speed port 9, and to prevent misfire and interruption of fuel accompanied by raw gas due to incomplete fuel of the engine.
（発明の効果） この発明によれば、弁本体に貫通孔を形成し、吸気負圧
でこの貫通孔を開とする弁板を設けたために、気化器の
下流側が高吸気負圧状態となったときに、ここに自動的
に空気を送り込んで燃料と空気との混合比を可燃範囲内
とすることができる。そして、この場合、上記弁板と弁
本体とを枢支軸に共締めしたため、弁本体を枢支軸に取
付けるねじを利用して弁板を同上枢支軸にねじ止めする
ことができる。従って、弁板を取り付けるための別途の
ねじは不要であることからスロットル弁を簡単な構成と
することができ、かつ、組立も容易にできる。(Effect of the Invention) According to the present invention, since the through hole is formed in the valve main body and the valve plate that opens this through hole by the intake negative pressure is provided, the downstream side of the carburetor is in the high intake negative pressure state. At this time, the air can be automatically fed into the fuel cell so that the mixture ratio of the fuel and the air is within the flammable range. In this case, since the valve plate and the valve body are fastened together on the pivot shaft, the valve plate can be screwed to the pivot shaft by using a screw for attaching the valve body to the pivot shaft. Therefore, since a separate screw for attaching the valve plate is not required, the throttle valve can have a simple structure and can be easily assembled.
また、弁板を枢支軸にねじ止めするための比較的重量の
重いねじが、弁本体のほぼ重心を通る枢支軸上に位置す
るために、弁板を弁本体に取付けても、弁本体や弁板の
全体的な重心が枢支軸から大きく偏ることは防止され
る。よって、スロットル弁の重量バランスは良好に保た
れ、スロットル弁の開閉操作に伴う慣性重量が小さく抑
えられる。この結果、スロットル弁の開閉操作は円滑に
なされることとなる。Also, since the relatively heavy screw for screwing the valve plate to the pivot shaft is located on the pivot shaft that passes through the center of gravity of the valve body, even if the valve plate is attached to the valve body, The overall center of gravity of the main body and the valve plate is prevented from being largely deviated from the pivot axis. Therefore, the weight balance of the throttle valve is maintained well, and the inertial weight associated with the opening / closing operation of the throttle valve is kept small. As a result, the opening / closing operation of the throttle valve can be smoothly performed.
図はこの発明の実施例を示し、第１図は気化器の平面断
面図、第２図は気化器の側面部分断面図、第３図は第２
図のIII-III線矢視図、第４図はスロットル弁の展開斜
視図である。 １……気化器、２……吸気通路、８……スロットル弁、
13……弁本体、14……枢支軸、15……貫通孔、16……弁
板、17……ねじ。FIG. 1 shows an embodiment of the present invention, FIG. 1 is a plan sectional view of a vaporizer, FIG. 2 is a side partial sectional view of the vaporizer, and FIG.
FIG. 3 is a view taken along the line III-III in FIG. 4, and FIG. 4 is a developed perspective view of the throttle valve. 1 ... Vaporizer, 2 ... Intake passage, 8 ... Throttle valve,
13 …… Valve body, 14 …… Pivot shaft, 15 …… Through hole, 16 …… Valve plate, 17 …… Screw.
Claims (1)
軸にねじ止めされてほぼ重心位置を支持される弁本体を
設け、枢支軸の回動で弁本体が吸気通路を開閉するよう
にした気化器のスロットル弁において、上記弁本体に貫
通孔を形成し、吸気負圧でこの貫通孔を開とする弁板を
設け、この弁板と上記弁本体とを枢支軸に共締めしたこ
とを特徴とする気化器のスロットル弁。1. A pivot shaft that traverses an intake passage is provided, and a valve main body that is screwed to this pivot shaft to support a substantially center of gravity position is provided. The valve main body opens and closes the intake passage by rotation of the pivot shaft. In the throttle valve of the carburetor thus configured, a through hole is formed in the valve body, and a valve plate that opens the through hole by negative intake pressure is provided, and the valve plate and the valve body are pivotally supported. Throttle valve for carburetor characterized by being tightened together.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP16559185A JPH0672559B2 (en) | 1985-07-25 | 1985-07-25 | Carburetor throttle valve |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP16559185A JPH0672559B2 (en) | 1985-07-25 | 1985-07-25 | Carburetor throttle valve |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS6226331A JPS6226331A (en) | 1987-02-04 |
| JPH0672559B2 true JPH0672559B2 (en) | 1994-09-14 |
Family
ID=15815262
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP16559185A Expired - Fee Related JPH0672559B2 (en) | 1985-07-25 | 1985-07-25 | Carburetor throttle valve |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0672559B2 (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP4489011B2 (en) * | 2005-12-02 | 2010-06-23 | 本田技研工業株式会社 | Outboard motor equipped with internal combustion engine with carburetor |
| CN108979871B (en) * | 2018-07-23 | 2020-07-31 | 燕山大学 | Throttle valve based on FSAE racing car |
-
1985
- 1985-07-25 JP JP16559185A patent/JPH0672559B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JPS6226331A (en) | 1987-02-04 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| LAPS | Cancellation because of no payment of annual fees |