JP2780343B2 - Engine intake system - Google Patents
Engine intake systemInfo
- Publication number
- JP2780343B2 JP2780343B2 JP14947889A JP14947889A JP2780343B2 JP 2780343 B2 JP2780343 B2 JP 2780343B2 JP 14947889 A JP14947889 A JP 14947889A JP 14947889 A JP14947889 A JP 14947889A JP 2780343 B2 JP2780343 B2 JP 2780343B2
- Authority
- JP
- Japan
- Prior art keywords
- intake
- pipe
- long
- engine
- short
- 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 - Lifetime
Links
Description
【発明の詳細な説明】 〔産業上の利用分野〕 この発明は、吸気効率の向上を図って出力を向上でき
るエンジンの吸気装置に関する。Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an intake device for an engine that can improve output by improving intake efficiency.
一般に、エンジンの吸気通路は一つで、気化器に連結
してあって、気化器で吸気に燃料を混入したものをエン
ジンに吸引させるようにしている。又、吸気通路を面積
の大きいものと小さいものの二つを備え、回転速度によ
って使い分けているものもある。例えば、特開昭60−15
6929号公報、特開昭60−156926号公報参照。In general, the engine has one intake passage, which is connected to a carburetor, and the carburetor sucks fuel mixed with intake air into the engine. In addition, there is a type in which two intake passages are provided, one having a large area and one having a small area. For example, JP-A-60-15
See JP-A-6929 and JP-A-60-156926.
エンジンの吸気は、間欠的に急激に行われる。このた
め、吸気通路に吸気の脈動波が発生する。しかもこの脈
動波は、エンジンの回転数が変化することによって、吸
気のタイミング間隔も変化して、脈動波の波長が変化す
る。通常、吸気通路の長さは一定であるので、脈動波を
吸気の充填に有効に作用させる回転域と、逆に吸気の充
填を悪くさせる回転域ができる。一般には、エンジンの
使用条件を考慮して、最も利用する回転域で吸気効率が
よくなるように吸気通路長さを設定している。The intake of the engine is performed intermittently and rapidly. Therefore, a pulsating wave of intake air is generated in the intake passage. In addition, the pulsation wave changes the rotation speed of the engine, so that the timing interval of intake air also changes, and the wavelength of the pulsation wave changes. Normally, since the length of the intake passage is constant, there is a rotation range in which the pulsation wave effectively acts on the filling of the intake air and a rotation range in which the filling of the intake air is deteriorated. Generally, the length of the intake passage is set in consideration of the operating conditions of the engine so that the intake efficiency is improved in the most utilized rotation range.
この発明は、かかる点に鑑み、吸気管を長管と短管に
分岐させ、各々に気化器を連結し、開閉弁で回転域によ
って使い分けて、低速から高速まで吸気効率を向上でき
て出力増加が図れるエンジンの吸気装置を得ることを目
的とする。In view of the above, the present invention divides an intake pipe into a long pipe and a short pipe, connects a carburetor to each pipe, and selectively uses a carburetor according to the rotation range, thereby improving the intake efficiency from low to high speed and increasing output. It is an object of the present invention to obtain an intake device for an engine that can achieve the following.
上記目的を達成するために、この発明のエンジンの吸
気装置は、エンジンの吸気孔に長管と短管を二股に分岐
した吸気管を連結し、長管と短管に各々気化器を連結す
ると共に、長管と短管内に開閉弁を設け、低速域では長
管の開閉弁だけを開き、中速域では短管の開閉弁だけを
開き、高速域では長管と短管の両方の開閉弁を開くよう
にしたことにある。To achieve the above object, an intake device for an engine according to the present invention connects an intake pipe in which a long pipe and a short pipe are bifurcated to an intake hole of the engine, and connects a carburetor to each of the long pipe and the short pipe. At the same time, open / close valves are installed in the long and short pipes, open only the long pipe open / close valve in the low speed range, open only the short pipe open / close valve in the medium speed range, and open and close both the long pipe and short pipe in the high speed range. This is because the valve is opened.
長管と短管の二股に分岐した排気管は、長管を吸気が
緩やかでかつ吸気間隔が長い低速域の吸気脈動波を有効
に利用できる長さに設定する。又、短管は、中速域の吸
気が早くなりかつ吸気間隔が短くなる吸気脈動波を有効
に利用できる長さに設定する。そして、低速域では、長
管の開閉弁を開いて長管のみから吸気を供給し、中速域
では、短管の開閉弁を開いて短管のみから吸気を供給す
る。このため、低速域、中速域共に、吸気脈動波を吸気
を充填するのに有効に利用できて、吸気効率を高め、出
力を向上できる。高速域では、急激な吸気で、吸気の間
隔が短く、多量の吸気を必要とするので、長管と短管の
両方の開閉弁を開いて、吸気量を増量できて、出力の向
上ができる。The exhaust pipe branched into two branches, a long pipe and a short pipe, is set to have such a length that the long pipe can effectively use the intake pulsation wave in the low-speed region where the intake is gentle and the intake interval is long. In addition, the short pipe is set to have a length that can effectively utilize the intake pulsation wave in which the intake speed in the medium speed region becomes faster and the intake interval becomes shorter. In the low-speed range, the long pipe is opened and closed to supply air only from the long pipe, and in the medium-speed range, the short pipe is opened and air is supplied only from the short pipe. Therefore, in both the low speed range and the medium speed range, the intake pulsation wave can be effectively used to fill the intake air, and the intake efficiency can be increased and the output can be improved. In the high-speed range, the intake interval is short and the intake interval is short, and a large amount of intake is required.By opening both the long and short pipe open / close valves, the intake volume can be increased and the output can be improved. .
以下、本発明の実施例を図面によって説明する。 Hereinafter, embodiments of the present invention will be described with reference to the drawings.
エンジン１の吸気孔２に、吸気管３を連結する。吸気
管３は、入口側が二股に分岐してあって、長管４と短管
５が設けてある。長管４内には蝶型の開閉弁６を設け、
短管５内には同じく開閉弁７を設ける。そして、長管４
と短管５の端に気化器８を各々連結し、二つの気化器８
は、エアークリーナー９のアウトレット10に各々連結す
る。長管４は、吸気の通路全体の長さが、低速域の吸気
脈動波によって有効に吸気充填に働く長さに設定する。
又、短管５は、吸気の通路全体の長さが、中速域の吸気
脈動波によって有効に吸気充填に働く長さに設定する。
二つの開閉弁6,7は、点火ユニット11の点火パルスで制
御回路12を作動させ、サーボモーター13で開閉操作す
る。エンジン１の回転数で制御し、低回転域（第３図Ａ
の範囲）では、長管４の開閉弁６だけを開き、短管５を
閉じておく、中回転域（第３図Ｂの範囲）では、短管５
の開閉弁７だけを開き、長管４を閉じておく。そして、
高回転域（第３図Ｃの範囲）では、二つの開閉弁6,7を
共に開いて、長管４と短管５の両方から吸気を供給し
て、吸気量を増量する。これによって、低速域と中速域
では、吸気脈動効果で吸気充填効率を高め、高速域では
吸気量を増量できて、第３図に点線で示す出力のものを
実線で示す出力曲線まで高めて、出力の増加が図れる。An intake pipe 3 is connected to an intake hole 2 of the engine 1. The intake pipe 3 has a bifurcated inlet side, and a long pipe 4 and a short pipe 5 are provided. A butterfly-shaped on-off valve 6 is provided in the long pipe 4,
An on-off valve 7 is also provided in the short pipe 5. And long tube 4
And a carburetor 8 connected to the end of the short pipe 5 respectively.
Are connected to outlets 10 of the air cleaner 9 respectively. The length of the long pipe 4 is set so that the entire length of the intake passage works effectively for intake charging by the intake pulsation wave in the low-speed region.
In addition, the short pipe 5 is set so that the entire length of the intake passage works effectively for intake filling by the intake pulsation wave in the medium speed range.
The two opening / closing valves 6, 7 operate the control circuit 12 by the ignition pulse of the ignition unit 11, and are opened / closed by the servo motor 13. It is controlled by the number of revolutions of the engine 1 and is in a low revolution range (Fig. 3A
), Only the open / close valve 6 of the long pipe 4 is opened and the short pipe 5 is closed. In the middle rotation range (range of FIG. 3B), the short pipe 5 is closed.
Is opened, and the long pipe 4 is closed. And
In the high rotation range (the range in FIG. 3C), the two on-off valves 6 and 7 are both opened to supply the intake air from both the long pipe 4 and the short pipe 5 to increase the amount of intake air. Thus, in the low speed range and the medium speed range, the intake charging efficiency can be increased by the intake pulsation effect, and in the high speed range, the intake amount can be increased, and the output shown by the dotted line in FIG. 3 is increased to the output curve shown by the solid line. Output can be increased.
以上説明したように、この発明は上述のように構成し
たので、エンジンの低回転域は長管を使用し、中回転域
では短管を使用して、各々、吸気通路内に発生する吸気
の脈動によって、吸気の充填効率を高めることができ、
高回転域では、長管と短管の両方を用いて吸気量を増加
でき、回転の全域で、エンジン出力を高めて高出力にす
ることができる。又、気化器を二つ用いるので、各々の
気化器を使用回転域に合せてセッチングすることができ
て、適正な空燃比の吸気が供給できる。As described above, since the present invention is configured as described above, a long pipe is used in the low rotation range of the engine, and a short pipe is used in the middle rotation range, and each of the intake air generated in the intake passage is used. By the pulsation, the filling efficiency of the intake air can be increased,
In the high rotation range, the intake air volume can be increased by using both the long pipe and the short pipe, and the engine output can be increased to achieve high output throughout the rotation. In addition, since two carburetors are used, each carburetor can be set in accordance with the rotational speed range to be used, so that intake air with an appropriate air-fuel ratio can be supplied.
図は本発明の一実施例を示し、 第１図は側面図、 第２図は一部縦断平面図、 第３図は出力曲線図、 である。 １……エンジン、２……吸気孔、３……吸気管、４……
長管、５……短管、６……開閉弁、７……開閉弁、８…
…気化器。1 shows an embodiment of the present invention. FIG. 1 is a side view, FIG. 2 is a partially longitudinal plan view, and FIG. 3 is an output curve diagram. 1 ... engine, 2 ... intake hole, 3 ... intake pipe, 4 ...
Long pipe, 5 ... Short pipe, 6 ... On-off valve, 7 ... On-off valve, 8 ...
... a vaporizer.
Claims (1)
岐した吸気管を連結し、長管と短管に各々気化器を連結
すると共に、長管と短管内に開閉弁を設け、低速域では
長管の開閉弁だけを開き、中速域では短管の開閉弁だけ
を開き、高速域では長管と短管の両方の開閉弁を開くよ
うにしたことを特徴とするエンジンの吸気装置。1. A long pipe and a short pipe are bifurcated into an intake port of an engine, and a carburetor is connected to the long pipe and the short pipe, and an open / close valve is provided in the long pipe and the short pipe. The engine is characterized in that only the long pipe open / close valve is opened in the low speed range, only the short pipe open / close valve is opened in the medium speed range, and both the long pipe and the short pipe open / close valve are opened in the high speed range. Intake device.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP14947889A JP2780343B2 (en) | 1989-06-14 | 1989-06-14 | Engine intake system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP14947889A JP2780343B2 (en) | 1989-06-14 | 1989-06-14 | Engine intake system |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0318622A JPH0318622A (en) | 1991-01-28 |
| JP2780343B2 true JP2780343B2 (en) | 1998-07-30 |
Family
ID=15476029
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP14947889A Expired - Lifetime JP2780343B2 (en) | 1989-06-14 | 1989-06-14 | Engine intake system |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2780343B2 (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE4132624A1 (en) * | 1991-10-01 | 1993-04-08 | Gunter Stoetzel | Variable flow inlet manifold for optimum operation over range of speeds of IC engine - has widened duct near to engine with additional inlet ports regulated by rotating sleeve shutter |
| US5740778A (en) * | 1996-03-22 | 1998-04-21 | Ford Global Technologies, Inc. | Variable geometry intake system for an internal combustion engine |
-
1989
- 1989-06-14 JP JP14947889A patent/JP2780343B2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0318622A (en) | 1991-01-28 |
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