JPS6257822B2 - - Google Patents
Info
- Publication number
- JPS6257822B2 JPS6257822B2 JP58184673A JP18467383A JPS6257822B2 JP S6257822 B2 JPS6257822 B2 JP S6257822B2 JP 58184673 A JP58184673 A JP 58184673A JP 18467383 A JP18467383 A JP 18467383A JP S6257822 B2 JPS6257822 B2 JP S6257822B2
- Authority
- JP
- Japan
- Prior art keywords
- throttle valve
- fuel
- pump
- acceleration
- valve
- 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 40
- 230000001133 acceleration Effects 0.000 claims description 19
- 230000002265 prevention Effects 0.000 claims description 8
- 239000000463 material Substances 0.000 claims description 4
- 239000006200 vaporizer Substances 0.000 claims 1
- 230000007547 defect Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 1
- 241000607479 Yersinia pestis Species 0.000 description 1
- 230000002950 deficient Effects 0.000 description 1
- 230000003111 delayed effect Effects 0.000 description 1
- 239000002828 fuel tank Substances 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 230000007257 malfunction Effects 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- 230000003252 repetitive effect Effects 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 230000008016 vaporization Effects 0.000 description 1
- 238000009834 vaporization Methods 0.000 description 1
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
- F02M7/06—Means for enriching charge on sudden air throttle opening, i.e. at acceleration, e.g. storage means in passage way system
- F02M7/08—Means for enriching charge on sudden air throttle opening, i.e. at acceleration, e.g. storage means in passage way system using pumps
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
- F02B75/00—Other engines
- F02B75/02—Engines characterised by their cycles, e.g. six-stroke
- F02B2075/022—Engines characterised by their cycles, e.g. six-stroke having less than six strokes per cycle
- F02B2075/025—Engines characterised by their cycles, e.g. six-stroke having less than six strokes per cycle two
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Control Of The Air-Fuel Ratio Of Carburetors (AREA)
Description
【発明の詳細な説明】
本発明は2サイクルエンジンクランク室脈動圧
を絞弁全開時導入利用する蝶形絞弁式ダイヤフラ
ム型気化器の内蔵式加速ポンプに関するものであ
る。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a built-in acceleration pump for a butterfly throttle type diaphragm type carburetor which utilizes the pulsating pressure in the crank chamber of a two-stroke engine when the throttle valve is fully opened.
2サイクルエンジンは構造簡単軽量で全方位運
転が可能であり、同じく全方位運転の可能なダイ
ヤフラム型気化器を装着して、手持式或いは背負
式の携帯作業機、例えばチエンソー、刈払機、防
除機、ブロアー等に使用されている事は広く知ら
れる所である。之等携帯作業機は小型軽量が特に
要求される所より、近時エンジンの高回転化、高
出力化が進み、気化器も高出力に対応出来る様に
ベンチユリー径を大径化する傾向の為、加速初期
はベンチユリー部負圧が低くノズルよりの燃料吸
出しが遅れ加速不良を超す不具合の発生が多くな
つて来た。 The 2-cycle engine has a simple structure, is lightweight, and can be operated in all directions, and is equipped with a diaphragm carburetor that can also be operated in all directions, making it suitable for use in hand-held or backpack-type portable work equipment, such as chain saws, brush cutters, and pest control machines. It is widely known that it is used in blowers, etc. These portable working machines are particularly required to be compact and lightweight, and as engines have recently become faster and more powerful, there is also a trend to increase the diameter of the ventilator to accommodate the high output of carburetors. In the early stages of acceleration, the negative pressure in the ventilator is low and the suction of fuel from the nozzle is delayed, resulting in more problems than poor acceleration.
之の解決策として、2サイクルエンジンクラン
ク室内の脈動圧を蝶形絞弁の絞弁軸に設けた横貫
通孔により絞弁全開時のみ導入利用する加速ポン
プがあり、従来例では気化器外周部に設けたダイ
ヤフラム型加速ポンプの気室にこの脈動圧を導入
して、ダイヤフラムのポンプ作用により加速燃料
を高速燃料系統より強制噴出させるものはある
が、ダイヤフラム式加速ポンプの為、加速ポンプ
は気化器外周部にのみ取付け可能であり、燃料通
路は長く曲折が多く燃料流れがおそくなり加速、
特に繰り返し加速が不良となり易い。又気化器外
周部にある為、外部熱の影響を受けて燃料ペーパ
ーの発生により加速性能に障害が起り易い欠陥が
あつた。 As a solution to this problem, there is an acceleration pump that introduces and uses the pulsating pressure in the crank chamber of a two-stroke engine only when the throttle valve is fully open through a horizontal through hole provided in the throttle shaft of the butterfly throttle valve. There are some models that introduce this pulsating pressure into the air chamber of a diaphragm-type accelerator pump installed in the diaphragm, and forcibly inject accelerating fuel from the high-speed fuel system through the pump action of the diaphragm. It can be installed only on the outer periphery of the vessel, and the fuel passage is long and has many twists and turns, slowing down the fuel flow and causing acceleration.
In particular, repeated acceleration tends to be defective. Also, since it is located on the outer periphery of the carburetor, it is affected by external heat and has a defect that tends to cause problems in acceleration performance due to the generation of fuel paper.
本発明は之を解決すべく2サイクルエンジンの
クランク室内の脈動圧を蝶形絞弁軸に設けた横貫
通孔により絞弁全開時のみ導入し、気化器に内蔵
したゴム等の復原性材料で成形した長袋形加速ポ
ンプ25の外周に加圧して内側の燃料を押出し、
高速燃料系統の燃料計量針弁とバツクブリード防
止弁との間に強制噴出させて成る、蝶形絞弁式ダ
イヤフラム型気化器の内蔵式長袋形加速ポンプで
ある。 In order to solve this problem, the present invention introduces the pulsating pressure in the crank chamber of a two-stroke engine only when the throttle valve is fully opened through a horizontal through hole provided in the butterfly-shaped throttle valve shaft, and uses a stable material such as rubber built into the carburetor. Pressure is applied to the outer periphery of the formed long bag-shaped accelerator pump 25 to push out the fuel inside.
This is a long bag type accelerator pump with a built-in butterfly throttle type diaphragm type carburetor that forcibly injects fuel between the fuel metering needle valve and back bleed prevention valve of the high speed fuel system.
図面について説明すると第1図、第2図は本発
明気化器実施例の機能説明用縦断面図であり、第
1図は絞弁全開加速時、第2図はアイドリング開
度時を示す。第3図は本発明加速ポンプ要部の作
動説明図である。 To explain the drawings, FIGS. 1 and 2 are longitudinal cross-sectional views for explaining the functions of an embodiment of the carburetor of the present invention. FIG. 1 shows the throttle valve when the throttle valve is fully opened during acceleration, and FIG. 2 shows the state when the throttle valve is idling. FIG. 3 is an explanatory diagram of the operation of the essential parts of the accelerator pump of the present invention.
図に於て1はダイヤフラム型気化器本体、2は
燃料ポンプカバー、3は図示していないエンジン
クランク室よりの燃料ポンプ作動用脈動圧導入
口、4は燃料ポンプダイヤフラム、5は燃料流入
口、6は燃料濾鋼で運転中は図示していない燃料
タンクより燃料流入口5を通り、吸引吐出され流
入弁7に圧送される。 In the figure, 1 is the diaphragm type carburetor body, 2 is the fuel pump cover, 3 is the pulsating pressure inlet for operating the fuel pump from the engine crank chamber (not shown), 4 is the fuel pump diaphragm, 5 is the fuel inlet, Reference numeral 6 denotes a fuel filter steel, which is sucked and discharged from a fuel tank (not shown) through a fuel inlet 5 during operation, and is fed under pressure to an inflow valve 7.
8はメタリングダイヤフラム、9はメスリング
レバー軸、10はメタリングレバー、11はメタ
リングレバーばね、12はメタリングカバーで外
気と連通している。メタリングダイヤフラム8内
側のメタリング室13は運転中はメタリングダイ
ヤフラム機能により定負圧が保持される。 8 is a metering diaphragm, 9 is a female ring lever shaft, 10 is a metering lever, 11 is a metering lever spring, and 12 is a metering cover that communicates with the outside air. During operation, a constant negative pressure is maintained in the metering chamber 13 inside the metering diaphragm 8 by the metering diaphragm function.
気化器本体1にはベンチユリー孔14と絞弁孔
15が前后に貫通している。絞弁孔15には横断
直交する絞弁軸16に蝶形絞弁17が固着され、
運転操作により絞弁孔15を開閉する。 A ventilator hole 14 and a throttle hole 15 pass through the carburetor body 1 from the front to the rear. A butterfly-shaped throttle valve 17 is fixed to the throttle valve shaft 16 which is orthogonal to the throttle hole 15.
The throttle valve hole 15 is opened and closed by driving operation.
蝶形絞弁17のアイドリング開度に対応して絞
弁孔15には複数個の低速燃料噴口が開口し、低
速燃料計量針弁19により計量された燃料が噴出
し、アイドリング運転、低速運転が出来る。 A plurality of low-speed fuel nozzles are opened in the throttle valve hole 15 in accordance with the idling opening degree of the butterfly-shaped throttle valve 17, and fuel metered by the low-speed fuel metering needle valve 19 is spouted out, allowing idling operation and low-speed operation to be performed. I can do it.
ベンチユリー14には高速燃料噴口20が開口
し、その直前にバツクブリード防止弁21が設け
られている。アイドリング運転時、高速燃料噴口
20よりベンチユリー内大気がメタリング室13
に逆流し、低速燃料噴口18に流入してアイドリ
ング運転が不調、停止するダイヤフラム型気化器
特有の所渭バツクブリード現象を防止する為にバ
ツクブリード防止弁21はアイドリング時は前后
気圧差により逆止弁となり閉止される。 A high-speed fuel nozzle 20 opens in the ventilate 14, and a back bleed prevention valve 21 is provided just in front of the high-speed fuel nozzle 20. During idling, the atmosphere inside the ventilate flows into the metering chamber 13 from the high-speed fuel nozzle 20.
In order to prevent the back bleed phenomenon peculiar to diaphragm type carburetors, in which the backflow flows back into the low-speed fuel nozzle 18 and causes idling to malfunction and stop, the back bleed prevention valve 21 uses a back pressure difference to prevent back flow during idling. It becomes a valve and is closed.
高速運転時は高速燃料噴口20の吸出負圧が高
く、その為バツクブリード防止弁21は開き高速
燃料計量針弁22により計量された燃料が噴出し
高速運転が出来る。 During high-speed operation, the suction negative pressure of the high-speed fuel nozzle 20 is high, so the back bleed prevention valve 21 opens and fuel metered by the high-speed fuel metering needle valve 22 is jetted out, allowing high-speed operation.
この様に構成された従来公知の蝶形絞弁式ダイ
ヤフラム型気化器に於て、本発明は第1図に示す
様にエンジンクランク室の脈動圧通路23に、蝶
形絞弁17全開加速時に絞弁軸16に設けた横貫
通孔24により、ゴム等の復原性材料で成形され
た長袋形加速ポンプ25の外周気室26に連通
し、クランク室脈動圧により長袋形加速ポンプ2
5の内部燃料を、バツクブリード防止弁21と高
速燃料計量針弁22の中間に押出し高速燃料噴口
20より強制噴出させ、全開加速時の燃料吸出お
くれによる加速不良を改善する。 In the conventionally known butterfly throttle valve diaphragm carburetor constructed in this manner, the present invention provides a pulsating pressure passage 23 in the engine crank chamber as shown in FIG. A lateral through-hole 24 provided in the throttle valve shaft 16 communicates with an outer circumferential air chamber 26 of a long-bag accelerator pump 25 made of a stable material such as rubber, and the long-bag accelerator pump 2 is activated by the crank chamber pulsating pressure.
The internal fuel of No. 5 is forced out between the back bleed prevention valve 21 and the high speed fuel metering needle valve 22 and is forcibly injected from the high speed fuel injection port 20 to improve poor acceleration due to a delay in fuel suction during full throttle acceleration.
尚第2図に示す様にアイドリング時にはエンジ
ンクランク室脈動圧通路23は絞弁軸16の外周
により遮断され、長袋形加速ポンプ25の作動を
停止する為、高速燃料噴口20より燃料滴出の不
具合は防止される。 As shown in FIG. 2, during idling, the engine crank chamber pulsating pressure passage 23 is blocked by the outer periphery of the throttle valve shaft 16 and the operation of the long bag accelerator pump 25 is stopped. Defects are prevented.
第3図は長袋形加速ポンプ25周辺の詳細を示
すものでエンジンクランク室の脈動圧通路23よ
り外周気室26に到達した脈動正圧により長袋形
加速ポンプ25は図中点線に示す如く圧縮され内
部燃料が押出され加速おくれが改善される。27
は長袋形加速ポンプ25の固定洩れ止めリング、
28は外周気室26の塞蓋である。 FIG. 3 shows details around the long bag accelerator pump 25. The pulsating positive pressure reaching the outer air chamber 26 from the pulsating pressure passage 23 of the engine crank chamber causes the long bag accelerator pump 25 to move as shown by the dotted line in the figure. The compressed internal fuel is pushed out and acceleration lag is improved. 27
is the fixed leakage prevention ring of the long bag type accelerator pump 25,
28 is a cover for the outer peripheral air chamber 26.
本発明は加速ポンプがこの様に小型長袋形に構
成されている為、気化器本体1に簡単に内蔵可能
で、外形の拡大、重量増加、コスト上昇を招く事
が少ない。又高速燃料噴口20の直近に位置出来
る為、加速燃料通路も短く簡単であり、又加速ポ
ンプもゴム等の復原力の強い材料で成形してある
為、脈動正圧による加速燃料の吐出后に脈動負圧
により速かに原形に復帰すると共に、バツクブリ
ード防止弁21が閉止する為空気を巻込むことな
く高速燃料計量針弁22により計量された燃料の
みを吸込むことが出来、加速おくれの改善、特に
繰り返し加速の改善に有効確実である。 Since the accelerator pump of the present invention is configured in such a small and long bag shape, it can be easily built into the carburetor main body 1, and it is unlikely to cause an increase in external size, weight, or cost. In addition, since it can be located close to the high-speed fuel nozzle 20, the acceleration fuel passage is short and simple, and the acceleration pump is also made of a material with strong stability such as rubber, so that after the acceleration fuel is discharged due to pulsating positive pressure. It quickly returns to its original shape due to pulsating negative pressure, and since the back bleed prevention valve 21 closes, only the fuel metered by the high-speed fuel metering needle valve 22 can be sucked in without drawing in air, improving acceleration lag. , especially effective in improving repetitive acceleration.
更に気化器本体内蔵式の為、燃料の気化潜熱に
より熱上昇も少なく、熱による加速燃料系統のベ
ーパー障害が起り難い等、簡単、低コストに拘ら
ず有効確実な加速機能を発揮出来、工業的効果大
である。 Furthermore, since the carburetor is built-in, there is little heat rise due to the latent heat of vaporization of the fuel, and vapor failure of the acceleration fuel system due to heat is unlikely to occur.It is simple and low cost, yet provides an effective and reliable acceleration function, making it suitable for industrial use. It is highly effective.
第1図、第2図は本発明気化器実施例の機能説
明縦断面図で、第1図は絞弁全開加速時、第2図
はアイドリング開度時を示す。第3図は本発明加
速ポンプ要部の作動説明図である。
FIGS. 1 and 2 are functional explanatory longitudinal cross-sectional views of an embodiment of the carburetor of the present invention, with FIG. 1 showing the throttle valve fully opened when accelerating, and FIG. 2 showing the throttle valve opening at idling. FIG. 3 is an explanatory diagram of the operation of the essential parts of the accelerator pump of the present invention.
Claims (1)
蝶形絞弁17の絞弁軸16に設けた横貫通孔24
により絞弁全開時のみ導入し、気化器に内蔵した
ゴム等の復原性材料で成形した長袋形加速ポンプ
25の外周に加圧し、ポンプ内燃料を高速燃料計
量針弁22とバツクブリード防止弁21との間に
強制噴出させて成る蝶形絞弁式ダイヤフラム型気
化器の加速ポンプ。1 A horizontal through hole 24 provided in the throttle valve shaft 16 of the butterfly throttle valve 17 for controlling the pulsating pressure in the crank chamber of a 2-cycle engine.
is introduced only when the throttle valve is fully open, and pressurizes the outer circumference of the long bag accelerator pump 25 made of a stable material such as rubber built into the carburetor, and the fuel inside the pump is transferred to the high speed fuel metering needle valve 22 and the back bleed prevention valve. This is an acceleration pump of a butterfly-shaped throttle valve type diaphragm type vaporizer that is configured to forcefully emit air between the 21 and 21.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP58184673A JPS6075750A (en) | 1983-10-03 | 1983-10-03 | Accelerator pump of diaphragm type carburetter |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP58184673A JPS6075750A (en) | 1983-10-03 | 1983-10-03 | Accelerator pump of diaphragm type carburetter |
Publications (2)
Publication Number | Publication Date |
---|---|
JPS6075750A JPS6075750A (en) | 1985-04-30 |
JPS6257822B2 true JPS6257822B2 (en) | 1987-12-02 |
Family
ID=16157352
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP58184673A Granted JPS6075750A (en) | 1983-10-03 | 1983-10-03 | Accelerator pump of diaphragm type carburetter |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS6075750A (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH02138337U (en) * | 1989-04-18 | 1990-11-19 |
Families Citing this family (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102005036091B4 (en) * | 2005-08-01 | 2018-05-09 | Andreas Stihl Ag & Co. Kg | Carburetor of an internal combustion engine |
DE102006005696B4 (en) * | 2006-02-08 | 2016-02-11 | Andreas Stihl Ag & Co. Kg | carburetor |
JP2008215153A (en) * | 2007-03-02 | 2008-09-18 | Walbro Japan Inc | Accelerator for carburetor |
-
1983
- 1983-10-03 JP JP58184673A patent/JPS6075750A/en active Granted
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH02138337U (en) * | 1989-04-18 | 1990-11-19 |
Also Published As
Publication number | Publication date |
---|---|
JPS6075750A (en) | 1985-04-30 |
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