JPS6245068Y2 - - Google Patents
Info
- Publication number
- JPS6245068Y2 JPS6245068Y2 JP1980179988U JP17998880U JPS6245068Y2 JP S6245068 Y2 JPS6245068 Y2 JP S6245068Y2 JP 1980179988 U JP1980179988 U JP 1980179988U JP 17998880 U JP17998880 U JP 17998880U JP S6245068 Y2 JPS6245068 Y2 JP S6245068Y2
- Authority
- JP
- Japan
- Prior art keywords
- intake passage
- main intake
- main
- throttle valve
- combustion 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.)
- Expired
Links
- 239000000446 fuel Substances 0.000 claims description 34
- 238000002485 combustion reaction Methods 0.000 claims description 26
- 239000012530 fluid Substances 0.000 claims description 5
- 238000011144 upstream manufacturing Methods 0.000 claims description 5
- 238000000889 atomisation Methods 0.000 description 5
- 241000234435 Lilium Species 0.000 description 3
- 239000000203 mixture Substances 0.000 description 3
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 2
- 229910002091 carbon monoxide Inorganic materials 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- 238000013459 approach Methods 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
Landscapes
- Control Of The Air-Fuel Ratio Of Carburetors (AREA)
Description
【考案の詳細な説明】
本考案は機関低負荷時、すなわち絞り弁の開度
が小さいときに、主吸気通路の管壁に沿つて流れ
る混合流体を副吸気通路に導くようにして霧化を
促進せしめ、有害成分の排出減少、燃費の向上等
を図つた内燃機関の燃料供給装置に関するもので
ある。[Detailed description of the invention] This invention atomizes the mixed fluid flowing along the pipe wall of the main intake passage to the sub-intake passage when the engine is under low load, that is, when the opening of the throttle valve is small. The present invention relates to a fuel supply system for an internal combustion engine, which is designed to increase fuel efficiency, reduce emissions of harmful components, and improve fuel efficiency.
内燃機関の燃料供給装置には、燃焼室に開口す
る主吸気通路に側路して燃焼室方向へ指向して開
口する副吸気通路を設けたものがある。 Some fuel supply devices for internal combustion engines are provided with a sub-intake passage that bypasses a main intake passage that opens into a combustion chamber and opens toward the combustion chamber.
このものは、ベンチユリよりも下流側の吸気通
路に設けられた絞り弁によつて燃焼室内に取り込
む空気量と燃料とを制御するようになつている
が、このものは絞り弁の開度が小さいとき、すな
わち、機関の低負荷時に、主吸気通路の管壁に沿
つて流れる液滴燃料が多くなり、霧化が促進され
にくいために有害成分である一酸化炭素、未燃焼
排ガスが多く排出され易いという欠点を有してい
る。 This type controls the amount of air and fuel taken into the combustion chamber by a throttle valve installed in the intake passage downstream of the bench lily, but the opening degree of the throttle valve is small in this type. When the engine is under low load, more droplets of fuel flow along the pipe wall of the main intake passage, and atomization is less likely to be promoted, resulting in more harmful carbon monoxide and unburned exhaust gas being emitted. It has the disadvantage of being easy to use.
また、適正な空燃比を保つために、燃焼にほと
んど寄与しない主吸気通路の管壁に沿つて流れる
液滴燃料分の損失を補償する必要があり、このた
めに、機関の低負荷時に、スローポートから主吸
気通路内に取り込まれる燃料の量を多くしなけれ
ばならず燃料消費がかさむという欠点をも有して
いる。 In addition, in order to maintain an appropriate air-fuel ratio, it is necessary to compensate for the loss of fuel droplets that flow along the pipe wall of the main intake passage, which contributes little to combustion. This also has the disadvantage that the amount of fuel taken into the main intake passage from the port must be increased, resulting in increased fuel consumption.
本考案は上記従来技術の有する欠点に鑑みて為
されたもので、本考案の特徴は機関低負荷時に、
管壁に沿つて流れる液滴燃料を副吸気通路内に取
り込むようにして混合気の霧化を促進せしめ、機
関の安定燃焼、省燃費等を図つた点にある。 The present invention was devised in view of the drawbacks of the above-mentioned conventional technology.
The fuel droplets flowing along the pipe wall are taken into the auxiliary intake passage to promote atomization of the air-fuel mixture, thereby achieving stable engine combustion and fuel efficiency.
以下、本考案の一実施例を図面に基づいて説明
する。 Hereinafter, one embodiment of the present invention will be described based on the drawings.
第１図において、１はシリンダ、２はピスト
ン、３はシリンダヘツドで、これら各要素１，
２，３によつて燃焼室Ａが形成されている。 In Fig. 1, 1 is a cylinder, 2 is a piston, and 3 is a cylinder head, and each of these elements 1,
A combustion chamber A is formed by 2 and 3.
５は一次側吸気通路、６は二次側吸気通路で、
各構成要素５，６は、ベンチユリ７，８よりも上
流側で大気開放され、燃焼室Ａに発生する吸入負
圧により大気を取り込むようになつており、各構
成要素５，６には、そのベンチユリ７，８よりも
下流側に一次側絞り弁９、二次側絞り弁１０が設
けられている。一次側吸気通路５、二次側吸気通
路６は、各絞り弁９，１０よりも下流側で合流し
ており、この合流部よりも下流側は、各吸気通路
５，６の絞り弁下流側開口径よりも大きな径を有
する主吸気通路１１となつていて、その燃焼室側
開口部には吸気弁１２が設けられている。 5 is the primary side intake passage, 6 is the secondary side intake passage,
Each component 5, 6 is opened to the atmosphere on the upstream side of the bench lily 7, 8, and takes in the atmosphere by the suction negative pressure generated in the combustion chamber A. A primary throttle valve 9 and a secondary throttle valve 10 are provided downstream of the bench lilies 7 and 8. The primary side intake passage 5 and the secondary side intake passage 6 merge on the downstream side of each throttle valve 9, 10, and the downstream side of this merging portion is the downstream side of the throttle valve of each intake passage 5, 6. The main intake passage 11 has a diameter larger than the opening diameter, and an intake valve 12 is provided at the opening on the combustion chamber side.
主吸気通路１１の一部を構成する主吸気管１３
の管壁１４には、主吸気通路１１に側路して、主
吸気通路１１の有効径よりも小さな有効径を有す
る副吸気通路１５が設けられている。この副吸気
通路１５は、始端が次に述べるスローポート１７
に連通しており、終端は主吸気通路１１の燃焼室
側開口部近傍まで延び、その部分は燃焼室方向へ
指向して開口する小径のノズル部１５ａに形成さ
れている。吸気管１３の管壁１４には、副吸気通
路１５を取り巻くようにして温水帯１６が設けら
れていて、副吸気通路１５内を通つて燃焼室Ａ内
に導かれる混合気体が温められるようになつてい
る。 Main intake pipe 13 forming a part of main intake passage 11
A sub-intake passage 15 is provided in the pipe wall 14 of the main intake passage 11 and has an effective diameter smaller than that of the main intake passage 11 . The starting end of this sub-intake passage 15 is a slow port 17 which will be described next.
The terminal end extends to the vicinity of the combustion chamber-side opening of the main intake passage 11, and that portion is formed into a small-diameter nozzle portion 15a that opens toward the combustion chamber. A warm water zone 16 is provided in the pipe wall 14 of the intake pipe 13 so as to surround the sub-intake passage 15, so that the mixed gas guided into the combustion chamber A through the sub-intake passage 15 is warmed. It's summery.
一次側絞り弁９の上流側近傍部には、キヤブフ
ロート室（図示を略す。）からの燃料を一次側吸
気通路５に供給するためのスローポート１７が設
けられており、キヤブフロート室からの燃料の一
部は通路１８を通つて副吸気通路１５に導かれる
ようになつており、通路１８の途中には、副吸気
通路１５に導かれる燃料の液量を調節するための
アジヤストスクリユー１９が設けられている。 A slow port 17 for supplying fuel from a cab float chamber (not shown) to the primary intake passage 5 is provided near the upstream side of the primary throttle valve 9. A part of the fuel is guided to the sub-intake passage 15 through the passage 18, and in the middle of the passage 18, there is an adjusting screw 19 for adjusting the amount of fuel introduced to the sub-intake passage 15. It is provided.
絞り弁９よりも直下流側には制御装置２０が設
けられており、この制御装置２０は主吸気通路１
１の管壁１４に沿つて流れる混合流体（液滴燃料
と空気）を副吸気通路１５に導く機能を有してい
る。制御装置２０は、主吸気通路１１内に出入す
るガイド部材２１と、一端がガイド部材２１に取
り付けられ、かつ、他端がダイヤフラム２２に取
り付けられたロツド２３と、管体２４と、から大
略構成されており、管体２４の内部はダイヤフラ
ム２２により画成されて、大気に通じる大気室Ｂ
と負圧室Ｃとになつており、負圧室Ｃは通路２５
により、二次側絞り弁１０の直下流側で二次側通
路６に連通している。ガイド部材２１は、ガイド
部材２１が主吸気通路１１内に突出したときに、
そのガイド部材２１の上部側が管壁内面１４ａか
ら突出し、かつ、その下部側が管壁内面１４ａか
ら突出しないように位置決めされた、内側に向い
た斜面（孔）２１ａを有しており、管壁内面１４
ａに沿つて流れる液滴燃料はこの斜面２１ａの部
分でガイド部材２１に取り込まれ、副吸気通路１
５に導かれるようになつている。 A control device 20 is provided immediately downstream of the throttle valve 9, and this control device 20 is connected to the main intake passage 1.
It has a function of guiding a mixed fluid (droplet fuel and air) flowing along one pipe wall 14 to the sub-intake passage 15. The control device 20 generally includes a guide member 21 that enters and exits the main intake passage 11, a rod 23 whose one end is attached to the guide member 21 and whose other end is attached to the diaphragm 22, and a pipe body 24. The inside of the tube body 24 is defined by the diaphragm 22 and has an atmospheric chamber B communicating with the atmosphere.
and a negative pressure chamber C, and the negative pressure chamber C is connected to the passage 25.
Therefore, it communicates with the secondary passage 6 immediately downstream of the secondary throttle valve 10. When the guide member 21 protrudes into the main intake passage 11,
The upper side of the guide member 21 protrudes from the inner surface 14a of the tube wall, and the lower side thereof has an inwardly facing slope (hole) 21a positioned so as not to protrude from the inner surface 14a of the tube wall. 14
The droplet fuel flowing along the slope 21a is taken into the guide member 21, and the auxiliary intake passage 1
5.
なお、２５はスプリングであり、主吸気通路１
１内に突出したガイド部材２１を管壁１４内に引
込める機能を有し、管壁外面１４ａダイヤフラム
との間に、ロツド２４の一部分を取り巻くように
して介装されている。 In addition, 25 is a spring, and the main intake passage 1
The rod 24 has a function of retracting the guide member 21 protruding into the tube wall 14, and is interposed between the tube wall outer surface 14a and the diaphragm so as to surround a portion of the rod 24.
次に、このように構成されたこの装置の作用を
機関低負荷時、機関高負荷時についてそれぞれ説
明する。 Next, the operation of this device configured as described above will be explained with respect to when the engine is under low load and when the engine is under high load.
(1) 機関の低負荷時
(イ) アイドリング時
絞り弁９，１０が閉弁状態にあり、絞り弁
９の直上流側が大気圧に近くなる。このため
に、一次側通路５に流入する空気は、スロー
ポート１７を通つて、キヤブフロート室から
の燃料と共に副吸気通路１５に導かれる。副
吸気通路１５は、主吸気通路１１の有効径よ
りもその有効径が小さいために、副吸気通路
１５に導かれた空気と液滴燃料とからなる混
合流体の流速が速くなり、霧化が促進される
こととなる。なお、この霧化は、温水１６に
よつて混合流体が温められることによりさら
に促進されるものである。(1) When the engine is under low load (a) When idling Throttle valves 9 and 10 are closed, and the pressure immediately upstream of throttle valve 9 is close to atmospheric pressure. For this purpose, the air flowing into the primary passage 5 passes through the slow port 17 and is guided to the auxiliary intake passage 15 together with the fuel from the cab float chamber. Since the effective diameter of the auxiliary intake passage 15 is smaller than the effective diameter of the main intake passage 11, the flow rate of the mixed fluid consisting of air and droplet fuel introduced into the auxiliary intake passage 15 increases, and atomization is facilitated. This will be promoted. Note that this atomization is further promoted by heating the mixed fluid with the hot water 16.
(ロ) 絞り弁９，１０の開度が小さいとき。 (b) When the opening degree of throttle valves 9 and 10 is small.
絞り弁９がスローポート１７に臨み、一次
側吸気通路５を通つて流入する空気と共に、
キヤブフロート室からの燃料が主吸気通路１
１に導かれることとなる。このとき、主吸気
通路１１内の圧力は大気圧よりも小さいか
ら、制御装置２０の大気室Ｂよりも負圧室Ｃ
の圧力が小さくなつている。絞り弁９，１０
の開度が小さいときにはこのように負圧室Ｃ
の圧力が大気室Ｂの圧力よりも小さくなつて
いるので、ガイド部材２１は第２図、第３図
に示すように主吸気通路１１に突出すること
となる。このとき、一次側吸気通路５の開口
径よりも主吸気通路１１の有効径が大きいの
で、主吸気通路１１に流入する空気が失速さ
れ、液滴燃料が管壁１４の内面１４ａに沿つ
て流れることとなるが、このスローポート１
７からの液滴燃料は空気と共に、ガイド部材
２１によつて副吸気通路１５に導かれること
となり、この副吸気通路１５内で霧化促進さ
れて、燃焼室Ａに導かれることとなる。な
お、同時に、キヤブフロートからの燃料の一
部は、アジヤストスクリユー１９により計量
され、通路１８を通つて副吸気通路１５に導
かれる。ために、霧化の促進された濃い適正
な空燃比を有する混合気が燃焼室Ａに吸入さ
れることとなり、機関の安定燃焼が行なわれ
ることとなる。 The throttle valve 9 faces the slow port 17, and together with the air flowing in through the primary intake passage 5,
Fuel from the cab float chamber flows into the main intake passage 1
This will lead you to 1. At this time, since the pressure inside the main intake passage 11 is lower than atmospheric pressure, the negative pressure chamber C is lower than the atmospheric chamber B of the control device 20.
pressure is decreasing. Throttle valve 9, 10
When the opening degree of C is small, the negative pressure chamber C
Since the pressure in the atmospheric chamber B is lower than the pressure in the atmospheric chamber B, the guide member 21 protrudes into the main intake passage 11 as shown in FIGS. 2 and 3. At this time, since the effective diameter of the main intake passage 11 is larger than the opening diameter of the primary side intake passage 5, the air flowing into the main intake passage 11 is stalled, and the fuel droplets flow along the inner surface 14a of the pipe wall 14. By the way, this slow port 1
The fuel droplets from 7 are guided along with air to the sub-intake passage 15 by the guide member 21, atomization is promoted within the sub-intake passage 15, and the fuel is guided to the combustion chamber A. At the same time, a portion of the fuel from the cab float is metered by the adjusting screw 19 and guided to the sub-intake passage 15 through the passage 18. Therefore, a rich, atomized air-fuel mixture having an appropriate air-fuel ratio is drawn into the combustion chamber A, resulting in stable combustion in the engine.
(ハ) 高負荷時
絞り弁９，１０の開度が大きくなると、主
吸気通路１１内の気圧が大気圧に近くなり、
ために大気室Ｂと負圧室Ｃとの気圧差が小さ
くなつて、ガイド部材２１は第４図、第５図
に示すようにスプリング２５の弾発力によつ
て管壁１４内に引込まれることとなる。ため
に、スローポート１７からの燃料はガイド部
材２１の斜面２１ａから副吸気通路１５を通
つて燃焼室Ａに導かれ、一次側通路５を通る
空気は、ガイド部材２１に邪摩されることな
く主吸気通路１１を通つて燃焼室Ａに導かれ
ることとなる。これゆえ、機関の高負荷時に
要求される適正な空燃比を有する混合気が燃
焼室Ａに導かれることとなり、機関の安定燃
焼が行なわれる。 (c) At high load When the opening degree of the throttle valves 9 and 10 increases, the pressure inside the main intake passage 11 approaches atmospheric pressure,
Therefore, the pressure difference between the atmospheric chamber B and the negative pressure chamber C becomes smaller, and the guide member 21 is pulled into the tube wall 14 by the elastic force of the spring 25, as shown in FIGS. 4 and 5. It will be. Therefore, the fuel from the slow port 17 is guided from the slope 21a of the guide member 21 through the auxiliary intake passage 15 to the combustion chamber A, and the air passing through the primary passage 5 is not disturbed by the guide member 21. It will be led to the combustion chamber A through the main intake passage 11. Therefore, an air-fuel mixture having an appropriate air-fuel ratio required when the engine is under high load is introduced into the combustion chamber A, and stable combustion of the engine is performed.
以上説明したように本考案によれば、機関低負
荷時に主吸気通路の管壁内面に沿つて流れる液滴
燃料を霧化させて燃焼室に導くことができ、これ
ゆえに機関の安定燃焼を行なわせることが可能と
なつて、一酸化炭素、未燃焼排ガスの排出減少、
省燃費等の効果を奏することとなる。 As explained above, according to the present invention, when the engine is under low load, the fuel droplets flowing along the inner surface of the pipe wall of the main intake passage can be atomized and guided into the combustion chamber, thereby achieving stable combustion in the engine. It has become possible to reduce emissions of carbon monoxide and unburned exhaust gas,
This results in effects such as fuel efficiency.
第１図は本考案に係る燃料供給装置の主要部縦
断面図、第２図、第３図はそれぞれ機関低負荷時
における制御装置の作用状態を示し、第２図は制
御装置の主要部平面図、第３図は制御装置の主要
部断面図、第４図、第５図はそれぞれ機関高負荷
時における制御装置の作用状態を示し、第４図は
制御装置の主要部平面図、第５図は制御装置の主
要部断面図、である。
９，１０……絞り弁、１１……主吸気通路、１
４……管壁、１５……副吸気通路、２０……制御
装置、２１……ガイド部材、２１ａ……斜面。
FIG. 1 is a longitudinal cross-sectional view of the main parts of the fuel supply system according to the present invention, FIGS. 2 and 3 respectively show the operating state of the control device at low engine load, and FIG. 2 is a plan view of the main parts of the control device. 3 are sectional views of the main parts of the control device, FIGS. 4 and 5 respectively show the operating state of the control device under high engine load, and FIG. 4 is a plan view of the main parts of the control device, and FIG. The figure is a sectional view of the main parts of the control device. 9, 10... Throttle valve, 11... Main intake passage, 1
4...Pipe wall, 15...Sub-intake passage, 20...Control device, 21...Guide member, 21a...Slope.
Claims (1)
有効径を有し、かつ、燃焼室に開口する主吸気通
路と、 前記主吸気通路に側路して設けられ、始端が前
記絞り弁上流のスローポートに連通し終端が前記
主吸気通路の燃焼室側開口部近傍で、前記燃焼室
方向へ指向して開口しかつ該主吸気通路の有効径
よりも小さな有効径を有する副吸気通路と、 前記絞り弁よりも下流側に位置し、前記主吸気
通路に生ずる吸入負圧によつて該主吸気通路内へ
の出入が制御され、かつ、前記絞り弁の開度が小
さいときに前記主吸気通路の管壁内面に沿つて流
れる混合流体を前記副吸気通路に導くための制御
装置と、 を有することを特徴とする内燃機関の燃料供給装
置。[Claims for Utility Model Registration] A main intake passage that has a larger effective diameter on the downstream side of the throttle valve than on the upstream side thereof and that opens into the combustion chamber, and a main intake passage that is provided as a side passage to the main intake passage. , a starting end communicates with the slow port upstream of the throttle valve, a terminal end near the combustion chamber side opening of the main intake passage, opening toward the combustion chamber, and having an effective diameter smaller than the effective diameter of the main intake passage. a sub-intake passage having a diameter, and an auxiliary intake passage located downstream of the throttle valve, whose entry and exit into and out of the main intake passage is controlled by suction negative pressure generated in the main intake passage; 1. A fuel supply device for an internal combustion engine, comprising: a control device for guiding a mixed fluid flowing along an inner surface of a pipe wall of the main intake passage to the auxiliary intake passage when the intake passage is low.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1980179988U JPS6245068Y2 (en) | 1980-12-15 | 1980-12-15 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1980179988U JPS6245068Y2 (en) | 1980-12-15 | 1980-12-15 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS57101358U JPS57101358U (en) | 1982-06-22 |
| JPS6245068Y2 true JPS6245068Y2 (en) | 1987-12-01 |
Family
ID=29976178
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1980179988U Expired JPS6245068Y2 (en) | 1980-12-15 | 1980-12-15 |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS6245068Y2 (en) |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS53127917A (en) * | 1977-12-01 | 1978-11-08 | Yamaha Motor Co Ltd | Suction device of multi-cylinder engine |
-
1980
- 1980-12-15 JP JP1980179988U patent/JPS6245068Y2/ja not_active Expired
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS53127917A (en) * | 1977-12-01 | 1978-11-08 | Yamaha Motor Co Ltd | Suction device of multi-cylinder engine |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS57101358U (en) | 1982-06-22 |
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