JPH01300045A - Carbureter - Google Patents
CarbureterInfo
- Publication number
- JPH01300045A JPH01300045A JP12578388A JP12578388A JPH01300045A JP H01300045 A JPH01300045 A JP H01300045A JP 12578388 A JP12578388 A JP 12578388A JP 12578388 A JP12578388 A JP 12578388A JP H01300045 A JPH01300045 A JP H01300045A
- Authority
- JP
- Japan
- Prior art keywords
- venturi
- air
- fuel
- nozzle
- fuel nozzle
- 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
- 239000000446 fuel Substances 0.000 claims abstract description 35
- 238000011144 upstream manufacturing Methods 0.000 claims abstract description 5
- 241000234435 Lilium Species 0.000 claims description 3
- 238000010586 diagram Methods 0.000 description 4
- 230000000694 effects Effects 0.000 description 4
- 239000000853 adhesive Substances 0.000 description 1
- 230000001070 adhesive effect Effects 0.000 description 1
- 238000000889 atomisation Methods 0.000 description 1
- 238000002485 combustion reaction Methods 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
Landscapes
- Control Of The Air-Fuel Ratio Of Carburetors (AREA)
Abstract
Description
【発明の詳細な説明】
〔産業上の利用分野〕
本発明は固定ベンチュリを持つ気化器に係り、特に高負
荷、高回転時に十分な空気と燃料を供給する気化器に関
する。DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a carburetor having a fixed venturi, and particularly to a carburetor that supplies sufficient air and fuel during high load and high rotation.
従来の装置は、実開昭６０−９７３５９号に記載のよう
に、ベンチュリ内に調整突起を設けて燃料ノズルに発生
する負圧を高めることにより必要な燃料量を供給してい
た。In the conventional device, as described in Japanese Utility Model Application Publication No. 60-97359, a necessary amount of fuel is supplied by providing an adjusting projection in the venturi to increase the negative pressure generated in the fuel nozzle.
上記従来技術は、調整突起が通路内に突出するため、ベ
ンチュリ部の空気流れ方向への投影面積が増大し、空気
抵抗が増大することは避けられず。In the above-mentioned conventional technology, since the adjustment protrusion protrudes into the passage, the projected area of the venturi portion in the air flow direction increases, which inevitably increases air resistance.
エンジンの吸入抵抗が増大して高負荷・高回転時に十分
な空気量が得られず、エンジン出力が十分に得られない
欠点があった。This had the disadvantage that the intake resistance of the engine increased, making it impossible to obtain a sufficient amount of air at high loads and high rotations, resulting in insufficient engine output.
本発明の目的は、気化器の空気抵抗を増大させることな
く、高負荷・高回転時に十分な空気、燃料を供給する気
化器を供給することにある。An object of the present invention is to provide a carburetor that can supply sufficient air and fuel at high loads and high rotations without increasing the air resistance of the carburetor.
上記目的は、十分な空気量を得るために空気抵抗を増大
させることなく、かつ十分な燃料を得るためにベンチュ
リの燃料ノズルに発生する負圧を大きくすることにより
達成される。The above object is achieved by increasing the negative pressure generated at the fuel nozzle of the venturi to obtain sufficient air volume without increasing air resistance and to obtain sufficient fuel.
吸入空気はベンチュリの手前で前縁曲線に沿って流れの
方向を大きく変えるため、燃料ノズル後方までうすを生
じるなどして乱れている。一方燃料ノズル上流に設けた
突起は、この乱れを生じる空間を埋めるよう設定されて
おり、このため燃料ノズル開口部での空気流れは安定し
ている。したかって突起なしの場合燃料ノズルが受けて
いる。The intake air changes its flow direction significantly along the leading edge curve before the venturi, resulting in turbulence and turbulence that occurs even to the rear of the fuel nozzle. On the other hand, the protrusion provided upstream of the fuel nozzle is designed to fill the space where this turbulence occurs, and therefore the air flow at the fuel nozzle opening is stable. Therefore, if there is no protrusion, the fuel nozzle is receiving it.
流れの乱れによる負圧の低下を本発明は受けず、高い負
圧を得ることができる。また、該突起は、空気流れ方向
から見た場合、燃料ノズルの突出しからはみ出ないよう
設定するため、投影面積が該突起によって増大すること
はなく、空気抵抗は増大しない。The present invention does not suffer from a drop in negative pressure due to flow turbulence, and can obtain high negative pressure. Moreover, since the protrusion is set so as not to protrude from the protrusion of the fuel nozzle when viewed from the air flow direction, the projected area does not increase due to the protrusion, and air resistance does not increase.
以下、本発明の一実施例を第１図により説明する。１は
気化器のベンチュリで、中に燃料ノズル２が突き出てい
る。空気は断面図の上方から下方へ向けて流れる。した
がって上面図は空気流れ方向の投影図でもある。この投
影図で、投影面積を増大させないように、燃料ノズル２
の空気上流側に、突起３を設けている。第２図に本発明
を用いない例を示す。第１図と第２図の違いは突起３の
有無であり、第１図と第２図の上面図での投影面積は等
しい。An embodiment of the present invention will be described below with reference to FIG. 1 is the venturi of the carburetor, and a fuel nozzle 2 protrudes inside it. Air flows from the top to the bottom of the cross-sectional view. The top view is therefore also a projection in the direction of air flow. In this projection diagram, the fuel nozzle 2 is
A protrusion 3 is provided on the air upstream side. FIG. 2 shows an example in which the present invention is not used. The difference between FIG. 1 and FIG. 2 is the presence or absence of the protrusion 3, and the projected areas in the top views of FIG. 1 and FIG. 2 are the same.
第１図と第２図のベンチュリにおいて同一の流れを与え
た場合のうず度の発生状態を表したものを図５に示す。FIG. 5 shows the state in which vortex occurs when the same flow is applied to the venturis shown in FIGS. 1 and 2.
となり合って流れる空気に速度差がある場合、粘性によ
ってうずが発生する６ベンチユリの前縁曲線４に向かう
流れは流速がとなり合う流れに対し低くなるためうずが
発生する。本発明を用いない例の場合、周縁面８４付近
に発生したうずは、後流に向けて残り、かつノズルに向
かう流れの流速も低下するため新たなうずが発生し、燃
料ノズル２の出口には大きなうず度が分布する。これに
対し本発明の実施例の場合、突起３の前縁でうすが発生
するが、この領域の流れは燃料ノズル２の方向に流れな
いため、燃料ノズル出口には圧力の影響を与えない。か
つ、ノズルの突起がないため新たなうずの発生がないた
め、燃料ノズル２の出口ではうず度が極めて小さい。When there is a speed difference between the air flowing next to each other, the flow toward the leading edge curve 4 of the six-bench lily, where vortices occur due to viscosity, has a lower flow velocity than the air flowing next to each other, so that vortices occur. In the case of an example in which the present invention is not used, the vortices generated near the peripheral surface 84 remain toward the wake, and the flow velocity of the flow toward the nozzle also decreases, so new vortices are generated at the outlet of the fuel nozzle 2. has a large eddy distribution. On the other hand, in the case of the embodiment of the present invention, thinning occurs at the leading edge of the protrusion 3, but since the flow in this region does not flow in the direction of the fuel nozzle 2, the pressure does not affect the fuel nozzle outlet. Moreover, since there is no protrusion of the nozzle, no new vortices are generated, so the degree of vortex at the outlet of the fuel nozzle 2 is extremely small.
以上の流れ分布の結果から、本発明を用いた実施例と用
いない実施例での、燃料ノズルに発生する負圧の大きさ
を比較すると、本発明を用いた実施例の場合はうす流れ
による動圧を受けない分大きな負圧を得ることができ、
したがって同一空気流量では、より多くの燃料を吸い出
すことができる。From the above flow distribution results, when comparing the magnitude of negative pressure generated in the fuel nozzle in the example using the present invention and the example not using the present invention, it is found that in the case of the example using the present invention, it is due to thin flow. Since it does not receive dynamic pressure, it can obtain a large negative pressure,
Therefore, more fuel can be sucked out with the same air flow rate.
また、ベンチュリの空気抵抗は空気流れ方向の投影面積
に比例するが、第１図と第２図の投影面積は同じである
ため、本発明を用いた実施例と本発明を用いない実施−
との空気抵抗は等しい。Furthermore, although the air resistance of a venturi is proportional to the projected area in the air flow direction, the projected areas in FIG. 1 and FIG.
The air resistance is equal.
一般に、ベンチュリの仕様を決定する場合、高い燃料ノ
ズルの負圧を得るためにはベンチュリ厚さを増大させて
空気流れ方向の投影面積を増大するが、この場合空気抵
抗が増大するため、十分な空気量が吸入できず、エンジ
ン出力を増大できない。しかし本発明によれば、十分に
高い燃料ノズル負圧を得え、かつベンチュリの投影面積
を増大させる必要がないことから、エンジンの高負荷高
回転時に十分な空気と燃料を供給することができる。Generally, when determining venturi specifications, in order to obtain high fuel nozzle negative pressure, the venturi thickness is increased to increase the projected area in the air flow direction, but in this case air resistance increases, so The amount of air cannot be sucked in, and the engine output cannot be increased. However, according to the present invention, it is possible to obtain a sufficiently high fuel nozzle negative pressure and there is no need to increase the projected area of the venturi, so it is possible to supply sufficient air and fuel when the engine is under high load and at high rotation speeds. .
突起３の目的は、燃料ノズル２部分の流れを整えるため
であるから、大きさ、形状、材質は任意に設定できる。Since the purpose of the protrusion 3 is to adjust the flow of the fuel nozzle 2, its size, shape, and material can be set arbitrarily.
第３図は本発明による実施例の一つで、燃料ノズル２と
突起３が離れた構造となっている。効果は第１図の実施
例と同じである。第４図も本発明による実施例の一つで
、突起３は別部品で、ベンチュリ１に接着、圧入、溶接
等の方法で固定されており、効果はやはり第１図の実施
例と同じである。FIG. 3 shows one embodiment of the present invention, in which the fuel nozzle 2 and the protrusion 3 are separated from each other. The effect is the same as the embodiment of FIG. FIG. 4 is also an embodiment according to the present invention, in which the protrusion 3 is a separate part and is fixed to the venturi 1 by adhesive, press-fitting, welding, etc., and the effect is the same as the embodiment shown in FIG. 1. be.
また、本発明はノズルがベンチュリ内に突き出していな
い形状のベンチュリにも適用できる。第６図は、ベンチ
ュリ内にノズルが突出していない形状のベンチュリにお
ける、本発明の実施例である。一般に、ノズルが突出し
ていないベンチュリはベンチュリの流れ方向投影面積を
小さくできる点で有利であるが、ノズル出口の空気流れ
が壁面流で流速が小さく、燃料が燃焼室に到達する時間
が大きく、燃料微粒化も悪い欠点を持つ。The present invention can also be applied to a venturi in which the nozzle does not protrude into the venturi. FIG. 6 shows an embodiment of the present invention in a venturi in which no nozzle projects into the venturi. In general, a venturi with no protruding nozzle is advantageous in that the projected area of the venturi in the flow direction can be reduced, but the air flow at the nozzle exit is a wall flow and the flow velocity is low, and the time it takes for the fuel to reach the combustion chamber is long, resulting in Atomization also has negative drawbacks.
この場合においても、突起３の存在によって、前縁曲線
４により生ずるうすは燃料ノズル２の出口に及ぶことが
ないため、大きな負圧を得ることができる。かつ、ベン
チュリの空気抵抗が増大しないことは、第１図の実施例
と同様である。Even in this case, due to the presence of the protrusion 3, the vacuum created by the leading edge curve 4 does not reach the outlet of the fuel nozzle 2, so that a large negative pressure can be obtained. Moreover, the air resistance of the venturi does not increase, similar to the embodiment shown in FIG. 1.
本発明によれば、気化器の空気抵抗を増大させることな
くより多くの燃料を供給できるので、高負荷高回転時に
十分な空気と燃料を供給する気化器とすることができる
。According to the present invention, more fuel can be supplied without increasing the air resistance of the carburetor, so that the carburetor can supply sufficient air and fuel during high-load, high-speed rotation.
第１図、第３図、第４図は本発明の一実施例のベンチュ
リの説明図、第２図は本発明を用いない場合のベンチュ
リの説明図、第５図（ａ）、（ｂ）はそれぞれ第１図、
第２図の例に流れを与えた場合のうず度の発生状態を表
した図、第６図はベンチュリ内に燃料ノズルが突出して
いないベンチュにおける本発明の一実施例のベンチュリ
の説明図である。
１・・・ベンチュリ、２・・・燃料ノズル、３・・・突
起、４・・・前縁曲線。
第１図 ｗｃ２図
第３図
第４図
第５図
（σ）（ｂ）
第６図Figures 1, 3, and 4 are explanatory diagrams of a venturi according to an embodiment of the present invention, Figure 2 is an explanatory diagram of a venturi when the present invention is not used, and Figures 5 (a) and (b). are shown in Figure 1, respectively.
FIG. 6 is an explanatory diagram of a venturi according to an embodiment of the present invention in which a fuel nozzle does not protrude into the venturi. . 1... Venturi, 2... Fuel nozzle, 3... Protrusion, 4... Leading edge curve. Figure 1 wc2 Figure 3 Figure 4 Figure 5 (σ) (b) Figure 6
Claims (1)
ルのベンチユリ上流側に、空気流れ方向への投影面積を
増大させない大きさの突起を設けたことを特徴とする気
化器。1. A carburetor having a fixed bench lily, characterized in that a protrusion of a size that does not increase the projected area in the air flow direction is provided on the upstream side of the bench lily of the fuel nozzle.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP12578388A JPH01300045A (en) | 1988-05-25 | 1988-05-25 | Carbureter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP12578388A JPH01300045A (en) | 1988-05-25 | 1988-05-25 | Carbureter |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH01300045A true JPH01300045A (en) | 1989-12-04 |
Family
ID=14918742
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP12578388A Pending JPH01300045A (en) | 1988-05-25 | 1988-05-25 | Carbureter |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH01300045A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US10060392B2 (en) | 2014-05-21 | 2018-08-28 | Yamabiko Corporation | Stratified scavenging two-stroke internal combustion engine and carburetor thereof |
-
1988
- 1988-05-25 JP JP12578388A patent/JPH01300045A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US10060392B2 (en) | 2014-05-21 | 2018-08-28 | Yamabiko Corporation | Stratified scavenging two-stroke internal combustion engine and carburetor thereof |
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