JP3496068B2 - Starter fuel supply for carburetor - Google Patents
Starter fuel supply for carburetorInfo
- Publication number
- JP3496068B2 JP3496068B2 JP33209894A JP33209894A JP3496068B2 JP 3496068 B2 JP3496068 B2 JP 3496068B2 JP 33209894 A JP33209894 A JP 33209894A JP 33209894 A JP33209894 A JP 33209894A JP 3496068 B2 JP3496068 B2 JP 3496068B2
- Authority
- JP
- Japan
- Prior art keywords
- starting
- plate
- shaft
- starter
- throttle 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 - Fee Related
Links
Landscapes
- Means For Warming Up And Starting Carburetors (AREA)
Description
【０００１】[0001]
【産業上の利用分野】本発明は動力鋸、刈払機などの携
帯作業機の内燃機関（以下単に機関という）に使用され
る膜型気化器、特に機関の始動操作が容易なバイスター
タ機構を備えた、気化器の始動燃料供給装置に関するも
のである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a membrane type carburetor used in an internal combustion engine (hereinafter referred to simply as "engine") of a portable working machine such as a power saw or a brush cutter, and more particularly, to a by-starter mechanism for easily starting the engine. The present invention relates to a starting fuel supply device for a carburetor.
【０００２】[0002]
【従来の技術】チヨーク弁方式の気化器では、機関始動
後の暖気運転に対する配慮が構造上難しい。暖気運転中
の混合気の濃度は外気温度、運転場所（特に高地）、機
関の調子などの運転条件により異なる。チヨーク弁方式
の気化器では、暖気運転条件に対応してチヨーク弁を手
動操作し、適当な濃さの混合気を継続して供給しなけれ
ばならない。チヨーク弁の微妙な操作を誤り、燃料を吸
い込みすぎて混合気が濃くなりすぎても、逆に燃料が少
なく混合気が薄くなりすぎても、機関は停止してしま
う。2. Description of the Related Art In a carburetor of the Chiyoke valve type, it is structurally difficult to consider warm-up operation after starting the engine. The concentration of the air-fuel mixture during warm-up operation differs depending on operating conditions such as the outside air temperature, the operating location (especially in highlands), and the engine condition. In the case of a carburetor of the Chioke valve type, the Chioke valve must be manually operated in response to the warming-up operating conditions to continuously supply an air-fuel mixture having an appropriate concentration. The engine will stop if the chiyoke valve is operated delicately and the fuel is sucked too much to make the mixture too rich, or conversely, if the amount of fuel is too little and the mixture becomes too thin.
【０００３】つまり、チヨーク弁の開度が大きすぎても
小さすぎても、機関は停止するので、チヨーク弁の開度
を適度な値に保つには非常に熟練を要する。特に、動力
鋸のように寒冷地で始動する場合とか、定圧燃料室に燃
料が十分に入つていない状態で始動する場合は、機関始
動後に暖気運転を継続するのが難しい。That is, the engine stops when the opening of the chain yoke valve is too large or too small. Therefore, it requires a great deal of skill to keep the opening of the chain yoke valve at an appropriate value. In particular, when starting in a cold region like a power saw or when starting in a state where fuel is not sufficiently contained in the constant pressure fuel chamber, it is difficult to continue the warm-up operation after starting the engine.
【０００４】実公昭47-26744号公報や特開昭60-204951
号公報に開示されるバイスタータを備えた膜式気化器の
始動燃料供給装置では、バイスタータの操作と機関の始
動操作を、独立かつ同時に行わなければならないので操
作が厄介であり、また始動燃料供給装置が大型になり、
携帯作業機のように機関の搭載空間が限られるものには
採用が難しい。JP-B-47-26744 and JP-A-60-204951
In the starting fuel supply device for a membrane carburetor equipped with a by-starter disclosed in Japanese Patent Publication, the operation of the by-starter and the starting operation of the engine have to be performed independently and simultaneously, which makes the operation troublesome, and the starting fuel The feeder becomes large,
It is difficult to adopt it for equipment with limited space such as portable work machines.
【０００５】[0005]
【発明が解決しようとする課題】本発明の目的は上述の
問題に鑑み、チヨーク弁による始動操作を熟知していな
い者でも、安全な機関回転数以下での機関の始動と、続
く暖気運転を確実に行うことができる、気化器の始動燃
料供給装置を提供することにある。SUMMARY OF THE INVENTION In view of the above problems, the object of the present invention is to provide a safe engine start-up and a subsequent warm-up operation even for those who are not familiar with the start-up operation by the chioke valve. It is to provide a starting fuel supply device for a carburetor that can be reliably performed.
【０００６】本発明の他の目的は携帯作業機のような狭
い搭載空間にも配設でき、始動操作が簡単な、気化器の
始動燃料供給装置を提供することにある。Another object of the present invention is to provide a starting fuel supply device for a carburetor, which can be arranged in a narrow mounting space such as a portable working machine and can be easily started.
【０００７】[0007]
【課題を解決するための手段】上記目的を達成するため
に、本発明の構成は始動燃料通路の途中に設けたプラン
ジヤにより始動用混合気を吸気通路の絞り弁よりも下流
側部分へ供給する気化器のバイスタータ式始動燃料供給
装置において、気化器本体の上流部位に絞り弁軸と平行
に始動軸を回転可能に支持し、始動軸に形成した切欠カ
ムにより往復動される前記プランジヤを気化器本体の内
部に配設し、始動軸の外端部にカムを有する始動板と保
持板とを支持し、始動操作時保持板が始動板により回動
されて絞り弁軸に結合したロツク板と係合する始動位置
にロツクされ、始動板の逆操作時始動板の保持板に対す
る相対回動が生じ、始動板のカムによつて保持板のロツ
クが解除されることを特徴とする。In order to achieve the above object, the structure of the present invention supplies a starting air-fuel mixture to a portion of the intake passage downstream of the throttle valve by a plunger provided in the middle of the starting fuel passage. In a carburetor by-starter starting fuel supply system, a starter shaft is rotatably supported parallel to the throttle valve shaft at an upstream portion of the carburetor body, and a notch cover formed on the starter shaft.
The plunger that is reciprocated by the
The starter plate with a cam on the outer end of the starting shaft.
Supports the holding plate, and the holding plate is rotated by the starting plate during the starting operation.
Starting position to engage the lock plate connected to the throttle valve shaft
When the starter plate is reversely operated, the starter plate holding plate
Rotation of the holding plate is caused by the cam of the starting plate.
It is characterized by being released .
【０００８】[0008]
【作用】バイスタータを作動するには、始動ボタンを所
定量だけ引くと、始動軸の始動板に押されて保持板が回
転し、絞り弁軸のロツク板を回転させながらロツク板の
回転軌跡を通過する。始動ボタンを離すと同時に、保持
板はばねの力によりロツク板の端縁に当つて停止する。
この時、始動燃料通路と空気通路が開かれ、始動用混合
気が混合気通路を経て吸気通路へ供給されるようにな
る。To operate the by-starter, when the start button is pulled by a predetermined amount, it is pushed by the starting plate of the starting shaft and the holding plate rotates, rotating the locking plate of the throttle valve shaft while rotating the locking plate. Pass through. Simultaneously with the release of the start button, the holding plate stops against the edge of the locking plate by the force of the spring.
At this time, the starting fuel passage and the air passage are opened, and the starting mixture is supplied to the intake passage through the mixture passage.
【０００９】バイスタータの作動を停止するには、始動
ボタンを押し戻すと、始動板のカムにより保持板が軸方
向へ押され、ロツク板との係合が解除され、保持板と始
動板はばねの力により停止位置へ戻される。In order to stop the operation of the by-starter, when the start button is pushed back, the holding plate is pushed in the axial direction by the cam of the starting plate, the engagement with the locking plate is released, and the holding plate and the starting plate are spring-loaded. Is returned to the stop position by the force of.
【００１０】[0010]
【実施例】図１に示すように、本発明による始動燃料供
給装置を備えた気化器は、吸気通路３１を有する気化器
本体１５を図示してない空気清浄器と一緒に、左右１対
のボルト孔１５ａを貫通するボルトにより、機関の吸気
ポートへ取り付けられる。本体１５の上端壁に膜１０を
挟んでカバー９を結合し、膜１０の上側に２行程機関の
クランク室の脈動圧を導入する室を、膜１０の下側にポ
ンプ室をそれぞれ区画し、これにより燃料ポンプＤが構
成される。燃料ポンプＤは燃料槽４６の燃料を管５８、
入口５８ａを経て吸引し、図示してない流入弁を経て定
圧燃料供給機構Ｃの定圧燃料室４７へ供給するようにな
つている。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS As shown in FIG. 1, a carburetor equipped with a starting fuel supply device according to the present invention comprises a carburetor main body 15 having an intake passage 31 and a pair of left and right air purifiers. It is attached to the intake port of the engine by a bolt penetrating the bolt hole 15a. The cover 9 is joined to the upper end wall of the main body 15 with the membrane 10 interposed therebetween, and a chamber for introducing the pulsating pressure of the crank chamber of the two-stroke engine is defined above the membrane 10 and a pump chamber is defined below the membrane 10. This constitutes the fuel pump D. The fuel pump D supplies the fuel in the fuel tank 46 to the pipe 58,
Suction is performed through the inlet 58a and is supplied to the constant pressure fuel chamber 47 of the constant pressure fuel supply mechanism C through an inflow valve (not shown).
【００１１】定圧燃料供給機構Ｃは本体１５の下端壁に
ガスケツト４９と膜５４を挟んで底部カバー５２を結合
し、膜５４の上側に定圧燃料室４７を、膜５４の下側に
大気室５１をそれぞれ区画してなる。定圧燃料室４７の
壁部に支軸５７によりレバー５０が支持され、レバー５
０の一端は膜５４に、レバー５０の他端は図示してない
流入弁にそれぞれ係合される。したがつて、定圧燃料室
４７の燃料が不足し、膜５４が上昇すると流入弁が開
き、燃料が補給される。逆に、定圧燃料室４７に燃料が
充満し、膜５４が下降すると流入弁が閉じ、燃料の供給
が中断される。こうして、定圧燃料室４７には常に一定
圧の燃料が保留される。The constant pressure fuel supply mechanism C connects the bottom cover 52 to the lower end wall of the main body 15 with the gasket 49 and the membrane 54 interposed therebetween, the constant pressure fuel chamber 47 above the membrane 54 and the atmosphere chamber 51 below the membrane 54. Each is divided. The lever 50 is supported by the support shaft 57 on the wall of the constant pressure fuel chamber 47,
One end of 0 is engaged with the membrane 54, and the other end of the lever 50 is engaged with an inflow valve (not shown). Therefore, when the fuel in the constant pressure fuel chamber 47 runs short and the membrane 54 rises, the inflow valve opens and the fuel is replenished. Conversely, when the constant pressure fuel chamber 47 is filled with fuel and the membrane 54 descends, the inflow valve is closed and the fuel supply is interrupted. Thus, the constant pressure fuel is always reserved in the constant pressure fuel chamber 47.
【００１２】定圧燃料室４７の燃料は通路４８、高速燃
料調整針弁５３、逆止弁５５を経て高速燃料噴孔１７か
ら本体１５を貫通する吸気通路３１へ吸引され、また図
２に示すように、同様にして複数の低速燃料噴孔１７ａ
から吸気通路３１へ吸引される。吸気通路３１には絞り
弁軸１４により公知の絞り弁３２が回動可能に配設され
る。複数の低速燃料噴孔１７ａは吸気通路３１の絞り弁
３２の閉位置（正確にはアイドル位置）付近に軸方向に
並設される。高速燃料噴孔１７は吸気通路３１の絞り弁
３２よりも上流側のベンチユリ部１６に配設される。Fuel in the constant pressure fuel chamber 47 is sucked from the high speed fuel injection hole 17 into the intake passage 31 penetrating the main body 15 through the passage 48, the high speed fuel adjusting needle valve 53 and the check valve 55, and as shown in FIG. Similarly, a plurality of low-speed fuel injection holes 17a
Is sucked into the intake passage 31. A known throttle valve 32 is rotatably arranged in the intake passage 31 by the throttle valve shaft 14. The plurality of low-speed fuel injection holes 17a are arranged in the axial direction in the vicinity of the closed position of the throttle valve 32 in the intake passage 31 (more precisely, the idle position). The high-speed fuel injection hole 17 is arranged in the bench lily portion 16 on the upstream side of the throttle valve 32 in the intake passage 31.
【００１３】機関を始動する前に、図１に示す定圧燃料
室４７の空気や燃料蒸気を排除したうえ、燃料槽４６の
燃料を定圧燃料室４７へ補給するために、手動の吸引ポ
ンプ４１が定圧燃料室４７と燃料槽４６との間に接続さ
れる。吸引ポンプ４１は本体４４にスポイド４４ａを結
合し、スポイド４４ａの内部に茸状の複合逆止弁４３
（吸込弁と吐出弁とを一体に備えたもの）を配設してな
る。スポイド４４ａを繰り返し押すと、定圧燃料室４７
の空気や燃料蒸気は管４２、複合逆止弁４３の傘部を押
し開いてスポイド４４ａの内部へ吸引され、さらに複合
逆止弁４３の軸心部を押し開き、管４５を経て燃料槽４
６へ排出される。定圧燃料室４７が負圧になるので、燃
料槽４６の燃料が管５８、入口５８ａ、燃料ポンプＤの
吸込弁と吐出弁、前述の流入弁を経て定圧燃料室４７へ
吸引される。Before starting the engine, a manual suction pump 41 is used to remove air and fuel vapor from the constant pressure fuel chamber 47 shown in FIG. 1 and replenish the fuel in the fuel tank 46 to the constant pressure fuel chamber 47. It is connected between the constant pressure fuel chamber 47 and the fuel tank 46. The suction pump 41 has a body 44 to which a spoid 44a is coupled, and a mushroom-shaped composite check valve 43 inside the spoid 44a.
(Incorporating a suction valve and a discharge valve integrally). By repeatedly pressing the spoid 44a, the constant pressure fuel chamber 47
Air and fuel vapor push the pipe 42 and the umbrella portion of the composite check valve 43 open, and are sucked into the inside of the spoid 44a, and further open the axial center portion of the composite check valve 43, and open the fuel tank 4 through the pipe 45.
It is discharged to 6. Since the constant pressure fuel chamber 47 has a negative pressure, the fuel in the fuel tank 46 is sucked into the constant pressure fuel chamber 47 through the pipe 58, the inlet 58a, the suction valve and the discharge valve of the fuel pump D, and the inflow valve described above.
【００１４】機関の加速時、燃料量を増加するために、
ピストン型の加速ポンプＢが本体１５の内部に配設され
る。すなわち、加速ポンプＢは絞り弁軸１４の軸孔を横
切るシリンダ３にピストン２を嵌装してなる。シリンダ
３の内端とピストン２との間に介装したばね４により、
ピストン２は絞り弁軸１４の切欠カム１４ａに当接され
る。機関の低速運転時、定圧燃料室４７の燃料は通路４
８、高速燃料調整針弁５３、逆止弁５５の嵌装部の環状
溝５６、加速燃料通路５を経てシリンダ３へ吸引されて
おり、機関の加速時、絞り弁軸１４の切欠カム１４ａに
よりピストン２が押されると、シリンダ３の燃料が加速
燃料通路５、環状溝５６、逆止弁５５、高速燃料噴孔１
７を経て吸気通路３１へ供給される。During the acceleration of the engine, in order to increase the fuel quantity,
A piston type acceleration pump B is arranged inside the main body 15. That is, the acceleration pump B is configured by fitting the piston 2 into the cylinder 3 that traverses the shaft hole of the throttle valve shaft 14. By the spring 4 interposed between the inner end of the cylinder 3 and the piston 2,
The piston 2 is brought into contact with the cutout cam 14 a of the throttle valve shaft 14. During low speed operation of the engine, the fuel in the constant pressure fuel chamber 47 is in the passage 4
8, the high-speed fuel adjustment needle valve 53, the annular groove 56 of the fitting portion of the check valve 55, and the suction fuel passage 5 are sucked into the cylinder 3 by the notch cam 14a of the throttle valve shaft 14 during engine acceleration. When the piston 2 is pushed, the fuel in the cylinder 3 causes the fuel in the acceleration fuel passage 5, the annular groove 56, the check valve 55, the high-speed fuel injection hole 1
It is supplied to the intake passage 31 via 7.
【００１５】バイスタータＡは本体１５の内部に配設し
た逆止弁２４と、シリンダ２２に嵌装したプランジヤ６
と、プランジヤ６を駆動するための切欠カム２１ａを有
する始動軸２１とを備えている。すなわち、図１，３に
示すように、機関の始動時、定圧燃料室４７の燃料が始
動燃料通路２５、逆止弁２４を経て、ガスケツト４９に
設けた孔からなる混合室４９ａへ入り、同時に、図２に
示すように、吸気通路３１の空気が空気通路１８、始動
軸２１の内部通路２０、本体１５の空気通路２０ａ（図
３）を経て混合室４９ａへ入り、両者は混合しつつ混合
室４９ａから混合気通路７５を経てシリンダ２２へ入
り、さらに本体１５の内部の混合気通路３３、ガスケツ
ト４９に設けた孔からなる室４９ｂ、混合気通路３３ａ
を経て、吸気通路３１の絞り弁３２よりも下流側部分へ
供給されるように構成される。図２に示すように、内部
通路２０の一端は始動軸２１の端面に開口する。内部通
路２０の他端は始動軸２１の周面に開口し、かつ始動軸
２１の回動により開閉される。逆止弁２４と一体的に始
動燃料量を規制するジエツト２７（図３）が設けられ
る。The by-starter A includes a check valve 24 disposed inside the main body 15 and a plunger 6 fitted in the cylinder 22.
And a starting shaft 21 having a notch cam 21a for driving the plunger 6. That is, as shown in FIGS. 1 and 3, when the engine is started, the fuel in the constant pressure fuel chamber 47 passes through the starting fuel passage 25 and the check valve 24 and then enters the mixing chamber 49a composed of the holes provided in the gasket 49, and at the same time. As shown in FIG. 2, the air in the intake passage 31 enters the mixing chamber 49a through the air passage 18, the internal passage 20 of the starting shaft 21, and the air passage 20a (FIG. 3) of the main body 15, and both are mixed while being mixed. The mixture enters from the chamber 49a into the cylinder 22 through the mixture passage 75, the mixture passage 33 inside the main body 15, the chamber 49b formed of a hole provided in the gasket 49, and the mixture passage 33a.
And is supplied to a portion of the intake passage 31 on the downstream side of the throttle valve 32. As shown in FIG. 2, one end of the internal passage 20 opens to the end surface of the starting shaft 21. The other end of the internal passage 20 opens on the peripheral surface of the starting shaft 21 and is opened and closed by the rotation of the starting shaft 21. A jet 27 (FIG. 3) is provided integrally with the check valve 24 to regulate the starting fuel amount.
【００１６】図２に示すように、絞り弁軸１４は左端に
弁レバー１２を結合され、かつ弁レバー１２と本体１５
との間に係止したばね１３により、絞り弁３２が閉位置
へ戻るように回転付勢される。絞り弁軸１４の右端は止
め輪６１を係止され、絞り弁軸１４の軸方向移動をばね
１３により阻止される。絞り弁軸１４の右端はロツク板
６２を結合される。絞り弁軸１４は本体１５の内部で切
欠カム１４ａを形成される。As shown in FIG. 2, the throttle valve shaft 14 is connected to the valve lever 12 at the left end, and the valve lever 12 and the main body 15 are connected together.
By means of the spring 13 that is locked between and, the throttle valve 32 is rotationally biased so as to return to the closed position. The stop ring 61 is locked at the right end of the throttle valve shaft 14, and the axial movement of the throttle valve shaft 14 is blocked by the spring 13. A lock plate 62 is connected to the right end of the throttle valve shaft 14. The throttle valve shaft 14 has a notch cam 14 a formed inside the main body 15.
【００１７】バイスタータＡは本体１５の内部に絞り弁
軸１４と平行に支持した始動軸２１と、始動軸２１の回
動により駆動されるプランジヤ６とを備えている。本体
１５の内部に始動軸２１と直交するシリンダ２２が形成
され、シリンダ２２に嵌装したプランジヤ６がばね７２
（図３）の力により、始動軸２１の切欠カム２１ａへ係
合される。図６に示すように、始動軸２１の環状溝２１
ｂに、シリンダ２２の外端部に嵌合した栓６９と一体の
ピンを係合することにより、始動軸２１は軸方向移動を
阻止される。The by-starter A is provided with a starting shaft 21 supported inside the main body 15 in parallel with the throttle valve shaft 14, and a plunger 6 driven by the rotation of the starting shaft 21. A cylinder 22 orthogonal to the starting shaft 21 is formed inside the main body 15, and the plunger 6 fitted in the cylinder 22 has a spring 72.
The force of (FIG. 3) engages the notch cam 21a of the starting shaft 21. As shown in FIG. 6, the annular groove 21 of the starting shaft 21.
The starting shaft 21 is prevented from moving in the axial direction by engaging with b a pin integral with the plug 69 fitted to the outer end of the cylinder 22.
【００１８】図３に示すように、ばね７２はプランジヤ
６と環状のばね座７１ａの間に介装され、ばね座７１ａ
はシリンダ２２の内端部にＯリング７１を保持する。プ
ランジヤ６は端部に弁体６ａを一体に備えており、プラ
ンジヤ６の復動位置で弁体６ａがＯリング７１に係合
し、混合気通路７５と混合気通路３３の間を閉塞する。
図２に示すように、バイスタータＡの操作機構は始動軸
２１に遊回転可能に支持した始動板６６と、始動軸２１
に軸方向移動可能かつ遊回転不能に支持した保持板６４
と、絞り弁軸１４に結合したロツク板６２とから構成さ
れる。始動軸２１に巻装したばね７７は、ばね座６８と
保持板６４の間に介装され、一端７７ａを本体１５のピ
ン７８（図４）に係止され、他端７７ｂを保持板６４の
突片６４ｃに係止され、始動板６６を図４に示すピン７
８へ付勢係合する。As shown in FIG. 3, the spring 72 is interposed between the plunger 6 and the annular spring seat 71a, and the spring seat 71a.
Holds an O-ring 71 at the inner end of the cylinder 22. Plunger 6 is integrally provided with a valve body 6a to the end, the valve member 6a at the backward position of the plunger 6 is engaged with the O-ring 71, it is closed between the mixture passage 75 and the air-fuel mixture passage 33.
As shown in FIG. 2, the operating mechanism of the by-starter A includes a starting plate 66 rotatably supported on the starting shaft 21 and a starting shaft 21.
A holding plate 64 supported axially movable and non-rotatably
And a lock plate 62 connected to the throttle valve shaft 14. The spring 77 wound around the starting shaft 21 is interposed between the spring seat 68 and the holding plate 64, one end 77a is locked to the pin 78 (FIG. 4) of the main body 15, and the other end 77b is held on the holding plate 64. The starter plate 66 is locked to the projecting piece 64c, and the starter plate 66 shown in FIG.
Energize to 8
【００１９】図４に示すように、始動板６６は孔ａまた
は孔ｂにロツドからなる始動ボタン５９を連結され、ピ
ン７８に当接する切欠縁部６６ｃと、保持板６４の端部
６４ｂに当接する突片６６ｂと、保持板６４の端部６４
ａの板面に当接するカム６６ａとを備えられる。始動板
６６の切欠縁部６６ｃはピン７８に当ると、始動板６６
の始動軸２１を中心とする時計方向の遊回転を阻止す
る。始動板６６のカム６６ａは、図２に示すように、絞
り弁軸１４のアイドル位置にあるロツク板６２の端縁に
当接することはなく、カム６６ａは保持板６４の方へ湾
曲されたカム面を形成する。As shown in FIG. 4, the starting plate 66 has a rod-shaped starting button 59 connected to the hole a or the hole b, and a notched edge portion 66c that abuts against the pin 78 and an end portion 64b of the holding plate 64. The protruding piece 66b contacting with the end 64 of the holding plate 64
and a cam 66a that abuts the plate surface of a. When the notched edge portion 66c of the starting plate 66 hits the pin 78,
Clockwise rotation about the starting shaft 21 is blocked. As shown in FIG. 2, the cam 66a of the starting plate 66 does not come into contact with the end edge of the locking plate 62 at the idle position of the throttle valve shaft 14, and the cam 66a is curved toward the holding plate 64. Form a surface.
【００２０】次に、本発明による始動燃料供給装置の作
動について説明する。機関の始動前に吸引ポンプ４１を
操作し、定圧燃料室４７の燃料蒸気や空気を排除し、燃
料槽４６の燃料を定圧燃料室４７へ補給する。次いで、
始動ボタン５９を引いて始動板６６を図４に示す位置か
ら、始動軸２１を中心として反時計方向へ回動すると、
始動板６６の突片６６ｂが保持板６４の端部６４ｂに当
り、始動軸２１がばね７７の力に抗して反時計方向へ回
動される。保持板６４の端部６４ａが絞り弁軸１４のロ
ツク板６２に当り、ロツク板６２を図４において時計方
向（絞り弁３２の開方向）へ回動するが、保持板６４の
端部６４ａとロツク板６２との係合が外れると、ロツク
板６２はばね１３の力によりアイドル位置へ戻される。Next, the operation of the starting fuel supply system according to the present invention will be described. Before starting the engine, the suction pump 41 is operated to remove the fuel vapor and air in the constant pressure fuel chamber 47 and replenish the fuel in the fuel tank 46 to the constant pressure fuel chamber 47. Then
When the starter button 59 is pulled to rotate the starter plate 66 from the position shown in FIG. 4 about the starter shaft 21 in the counterclockwise direction,
The projection 66b of the starting plate 66 contacts the end 64b of the holding plate 64, and the starting shaft 21 is rotated counterclockwise against the force of the spring 77. The end 64a of the holding plate 64 hits the locking plate 62 of the throttle valve shaft 14, and the locking plate 62 is rotated clockwise (the opening direction of the throttle valve 32) in FIG. When disengaged from the lock plate 62, the lock plate 62 is returned to the idle position by the force of the spring 13.
【００２１】ここで、始動ボタン５９を離すと、始動板
６６の端部６６ａはばね７７の力により時計方向に回動
するので、保持板６４の端部６４ａをも時計方向に回動
し、端部６４ａはロツク板６２の端縁に係合し、これに
より、始動軸２１が図５に示す位置にロツクされる。こ
うして、始動軸２１が所定角だけ回動されると、始動軸
２１の内部通路２０が空気通路２０ａへ連通し、プラン
ジヤ６がばね７２の力を受け、始動軸２１の切欠カム２
１ａへ落ち込み、弁体６ａがＯリング７１から離れ、混
合気通路７５と混合気通路３３との間を連通する。When the start button 59 is released, the end 66a of the start plate 66 is rotated clockwise by the force of the spring 77.
Therefore, the end 64a of the holding plate 64 is also rotated clockwise.
Then, the end portion 64a engages with the end edge of the locking plate 62, whereby the starting shaft 21 is locked at the position shown in FIG. In this way, when the starting shaft 21 is rotated by a predetermined angle, the internal passage 20 of the starting shaft 21 communicates with the air passage 20a, the plunger 6 receives the force of the spring 72, and the notch cam 2 of the starting shaft 21.
1a, the valve body 6a separates from the O-ring 71, and the mixture passage 75 and the mixture passage 33 communicate with each other.
【００２２】機関をリコイル（始動）操作すると、吸気
通路３１の負圧作用により、定圧燃料室４７の燃料が始
動燃料通路２５、逆止弁２４を経て混合室４９ａへ吸引
され、吸気通路３１の空気が空気通路１８、内部通路２
０、空気通路２０ａを経て混合室４９ａへ吸引される。
混合室４９ａで始動燃料と空気が混合し、始動用混合気
は混合気通路７５を経てシリンダ２２へ吸引され、さら
に混合気通路３３、室４９ｂ、混合気通路３３ａを経て
吸気通路３１へ吸引される。こうして、絞り弁３２がア
イドル位置にあつても、始動燃料と空気との濃い始動用
混合気が吸気通路３１の絞り弁３２よりも下流側部分へ
供給されるので、機関が円滑に始動される。When the engine is recoiled (started), the negative pressure of the intake passage 31 causes the fuel in the constant pressure fuel chamber 47 to be sucked into the mixing chamber 49a via the start fuel passage 25 and the check valve 24, so that the intake passage 31 is evacuated. Air is air passage 18, internal passage 2
0, and is sucked into the mixing chamber 49a through the air passage 20a.
The starting fuel and air are mixed in the mixing chamber 49a, the starting mixture is sucked into the cylinder 22 through the mixture passage 75, and further into the intake passage 31 through the mixture passage 33, the chamber 49b, and the mixture passage 33a. It In this way, even when the throttle valve 32 is at the idle position, a rich starting mixture of starting fuel and air is supplied to the portion of the intake passage 31 on the downstream side of the throttle valve 32, so that the engine is smoothly started. .
【００２３】機関の始動後も引き続き濃い始動用混合気
が供給されるが、暖機が得られたところで、弁レバー１
２により絞り弁軸１４を加速方向（図５において時計方
向）へ回動すれば、絞り弁軸１４のロツク板６２と始動
軸２１の保持板６４の端部６４ａとのロツクが解除さ
れ、保持板６４と始動軸２１と始動板６６とはばね７７
の力により時計方向へ回動され、図４に示すように、始
動板６６の切欠縁部６６ｃがピン７８に当つたところで
停止する。この時、内部通路２０と空気通路２０ａとの
間が遮断され、プランジヤ６が始動軸２１の周面により
押し上げられ、弁体６ａがＯリング７１へ係合し、混合
気通路７５と混合気通路３３との間を遮断する。After the engine is started, the rich mixture for starting is still supplied, but when the warm-up is obtained, the valve lever 1
When the throttle valve shaft 14 is rotated in the accelerating direction (clockwise in FIG. 5) by 2, the locking between the locking plate 62 of the throttle valve shaft 14 and the end 64a of the holding plate 64 of the starting shaft 21 is released and held. The plate 64, the starting shaft 21, and the starting plate 66 are provided with a spring 77.
Is rotated clockwise by the force of, and stops when the notched edge portion 66c of the starting plate 66 hits the pin 78 as shown in FIG. At this time, the internal passage 20 and the air passage 20a are shut off, the plunger 6 is pushed up by the peripheral surface of the starting shaft 21, the valve body 6a engages with the O-ring 71, and the mixture passage 75 and the mixture passage are formed. It cuts off between 33.
【００２４】機関の始動後前述の絞り弁を開く操作に連
動させずに、バイスタータの作動状態を解除する場合
は、始動ボタン５９を押し戻すと、図５において始動板
６６だけが始動軸２１を中心として時計方向へ回動し、
始動板６６のカム６６ａにより保持板６４の端部６４ａ
が、図６に示すように右方へ押され、保持板６４とロツ
ク板６２とのロツクが解除され、保持板６４がばね７７
の力により時計方向へ回転され、始動板６６の切欠縁部
６６ｃがピン７８へ当る。 After the engine is started, the operation of opening the throttle valve is continued.
When releasing the operating state of the bi-starter without moving it
When the start button 59 is pushed back, only the start plate 66 rotates clockwise about the start shaft 21 in FIG.
By the cam 66a of the starting plate 66, the end 64a of the holding plate 64
6 is pushed to the right as shown in FIG. 6, the locking between the holding plate 64 and the locking plate 62 is released, and the holding plate 64 is spring 77.
Is rotated in the clockwise direction by the force of, and the notched edge portion 66c of the starting plate 66 contacts the pin 78.
【００２５】なお、上述の実施例において、カム６６ａ
は始動板６６に設ける代りに、保持板６４に設けてもよ
い。In the above embodiment, the cam 66a is used.
May be provided on the holding plate 64 instead of being provided on the starting plate 66.
【００２６】[0026]
【発明の効果】本発明は上述のように、始動燃料通路の
途中に設けたプランジヤにより始動用混合気を吸気通路
の絞り弁よりも下流側部分へ供給する気化器のバイスタ
ータ式始動燃料供給装置において、気化器本体の端部に
絞り弁軸と平行に始動軸を回転可能に支持し、気化器本
体の内部に始動軸に直交して前記プランジヤを配設し、
始動軸に形成したカムによりプランジヤを往復動させる
ようにしたものであるから、次のような効果を奏する。As described above, according to the present invention, by the starter fuel supply for the carburetor, the starter air-fuel mixture is supplied to the portion of the intake passage on the downstream side of the throttle valve by the plunger provided in the start-up fuel passage. In the device, a starter shaft is rotatably supported at the end of the carburetor main body in parallel with the throttle valve shaft, and the plunger is disposed inside the carburetor main body orthogonal to the starter shaft.
Since the plunger is reciprocated by the cam formed on the starting shaft, the following effects can be obtained.
【００２７】保持板のロツクは絞り弁軸に結合したロツ
ク板によりなされ、保持板のロツク解除は始動板のカム
による保持板の軸方向移動によりなされ、保持板の軸方
向移動量はロツク板の板厚に相当する僅かなものである
から、動作に無理がない。The lock of the holding plate is made by a lock plate connected to the throttle valve shaft, and the lock release of the holding plate is made by the axial movement of the holding plate by the cam of the starting plate, and the axial movement amount of the holding plate is made by the locking plate. Since it is a slight amount corresponding to the plate thickness, there is no difficulty in operation.
【００２８】始動板と保持板を気化器本体に配設し、戻
しばねを始動軸の外端に設け、始動燃料通路のジエツト
と逆止弁を一体的に構成し、混合室を底部カバーにより
閉鎖されるガスケツトに孔として構成したので加工が容
易である。The starting plate and the holding plate are arranged in the carburetor body, the return spring is provided at the outer end of the starting shaft, the jet of the starting fuel passage and the check valve are integrally formed, and the mixing chamber is constituted by the bottom cover. Since the closed gasket is formed as a hole, it is easy to process.
【００２９】保持板と始動板を始動軸に設けたので、全
体的寸法を縮小できる。保持板はロツク板に当接してロ
ツクされるので、ロツクを解除する時絞り弁を少し開く
だけでよく、この時機関が高速回転域に至らないので安
全である。Since the holding plate and the starting plate are provided on the starting shaft , the overall size can be reduced. Since the holding plate is locked by coming into contact with the locking plate, it is sufficient to open the throttle valve a little when releasing the locking, and at this time the engine does not reach the high speed rotation range, which is safe.
【００３０】バイスタータ方式による本発明において
は、機関始動後の機関の暖機及び暖機解除機構を絞り弁
軸と始動軸とに設けたので暖機後の絞り弁開操作及び始
動ボタン操作によつて機関の暖機解除を行うことがで
き、機関操作者の任意動作によつて容易に行うことがで
きるものである。 In the present invention based on the by-starter method
Restricts the warm-up and warm-up cancellation mechanism of the engine after the engine is started.
Since it is installed on the shaft and the starting shaft, opening and starting the throttle valve after warm-up
The warm-up of the engine can be released by operating the operation buttons.
It can be easily performed by any operation of the engine operator.
It can be done.
【００３１】[0031]
【００３２】[0032]
【００３３】[0033]
【００３４】バイスタータの作動が停止すると、始動軸
の回動に伴なうプランジヤの復動動作により始動燃料通
路が閉じられるので、機関の全負荷運転でバイスタータ
から燃料や空気が吸気通路へ洩れ出ることはない。When the operation of the by-starter is stopped, the starting fuel passage is closed by the return movement of the plunger accompanying the rotation of the starting shaft, so that fuel and air are transferred from the by-starter to the intake passage during full load operation of the engine. It never leaks.
【００３５】始動軸は従来のチヨーク弁軸とほぼ同じ部
位に同じ動作角で作動するように配設できるので、チヨ
ーク方式と同じ仕様の作業機に、構造上の変更を加えな
いで装着できる。Since the starting shaft can be arranged at substantially the same position as the conventional chain yoke valve shaft so as to operate at the same operating angle, it can be mounted on a working machine having the same specifications as the chain yoke system without making structural changes.
【図１】本発明に係る始動燃料供給装置を備えた気化器
の正面断面図である。FIG. 1 is a front sectional view of a carburetor equipped with a starting fuel supply device according to the present invention.
【図２】図１の線２Ａ−２Ａによる平面断面図である。2 is a plan sectional view taken along the line 2A-2A in FIG.
【図３】図１の線３Ａ−３Ａによる側面断面図である。3 is a side sectional view taken along the line 3A-3A in FIG.
【図４】同気化器の始動操作前の要部を示す側面図であ
る。FIG. 4 is a side view showing a main part of the vaporizer before a starting operation.
【図５】同気化器の始動操作時の要部を示す側面図であ
る。FIG. 5 is a side view showing a main part at the time of starting operation of the vaporizer.
【図６】同気化器の始動操作終了時の要部を示す平面断
面図である。FIG. 6 is a cross-sectional plan view showing a main part of the vaporizer at the end of the starting operation.
Ａ：バイスタータ ６：プランジヤ １４：絞り弁軸
１５：気化器本体 １８，２０ａ：空気通路 ２１：始
動軸 ２４：逆止弁 ２５：始動燃料通路 ２７：ジエ
ツト ３１：吸気通路 ３２：絞り弁 ３３，３３ａ，
７５：混合気通路
４７：定圧燃料室 ４９：ガスケツト ４９ａ：混合室
５２：底部カバー
５９：始動ボタン ６２：ロツク板 ６４：保持板 ６
６：始動板 ６６ａ：カム ７７：ばね ７８：ピンA: By-starter 6: Plunger 14: Throttle valve shaft
15: carburetor main body 18, 20a: air passage 21: starting shaft 24: check valve 25: starting fuel passage 27: jet 31: intake passage 32: throttle valve 33, 33a,
75: Mixture passage 47: Constant pressure fuel chamber 49: Gasket 49a: Mixing chamber 52: Bottom cover 59: Start button 62: Lock plate 64: Holding plate 6
6: Starter plate 66a: Cam 77: Spring 78: Pin
───────────────────────────────────────────────────── フロントページの続き (56)参考文献 特開 昭58−15749（ＪＰ，Ａ) 特開 昭60−20495（ＪＰ，Ａ) 実開 平３−19457（ＪＰ，Ｕ) 実開 昭62−74159（ＪＰ，Ｕ) (58)調査した分野(Int.Cl.7，ＤＢ名) F02M 1/06 F02M 17/04 F02M 19/00 ─────────────────────────────────────────────────── ─── Continuation of the front page (56) References JP-A-58-15749 (JP, A) JP-A-60-20495 (JP, A) Actually open 3-19457 (JP, U) Actually open-62- 74159 (JP, U) (58) Fields investigated (Int.Cl. 7 , DB name) F02M 1/06 F02M 17/04 F02M 19/00
Claims (5)
より始動用混合気を吸気通路の絞り弁よりも下流側部分
へ供給する気化器のバイスタータ式始動燃料供給装置に
おいて、気化器本体の上流部位に絞り弁軸と平行に始動
軸を回転可能に支持し、始動軸に形成した切欠カムによ
り往復動される前記プランジヤを気化器本体の内部に配
設し、始動軸の外端部にカムを有する始動板と保持板と
を支持し、始動操作時保持板が始動板により回動されて
絞り弁軸に結合したロツク板と係合する始動位置にロツ
クされ、始動板の逆操作時始動板の保持板に対する相対
回動が生じ、始動板のカムによつて保持板のロツクが解
除されることを特徴とする、気化器の始動燃料供給装
置。1. A starter-type starter fuel supply device for a carburetor, which supplies a starter air-fuel mixture to a portion of a intake passage downstream of a throttle valve by a plunger provided in the starter fuel passage, upstream of a carburetor main body. The starter shaft is rotatably supported in parallel with the throttle valve shaft, and a notch cam formed on the starter shaft
The plunger, which is reciprocated, is placed inside the carburetor body.
And a starting plate having a cam on the outer end of the starting shaft and a holding plate.
And the holding plate is rotated by the starting plate during the starting operation.
The locking position is set to the starting position where it engages with the locking plate connected to the throttle valve shaft.
When the starter plate is operated in reverse, the starter plate is
The rotation of the holding plate is released by the cam of the starting plate.
A starting fuel supply device for a carburetor, characterized in that it is removed .
を支持し、始動板により始動軸をプランジヤの往動位置
へ回転した時、保持板が絞り弁軸のロツク板にロツクさ
れ、絞り弁軸を絞り弁の開方向へ回転した時、保持板の
ロツクが解除される、請求項１に記載の気化器の始動燃
料供給装置。2. A starter plate for connecting a starter button to said starter shaft is supported, and when the starter plate rotates the starter shaft to the forward position of the plunger, the holding plate is locked to the lock plate of the throttle valve shaft.
Are, when rotated in the opening direction of the throttle valve shaft throttle valve, locking of the holding plate is released, the carburetor of the starting fuel supply system according to claim 1.
板を遊回転不能かつ軸方向移動可能にそれぞれ支持し、
始動板により始動軸を往動位置へ回転する時、始動板に
より保持板が回転されて絞り弁軸のロツク板にロツクさ
れ、始動板により始動軸を復動位置へ回転する時、保持
板が軸方向へ摺動して絞り弁軸のロツク板の回転軌跡か
ら離脱する、請求項１，２の何れかに記載の気化器の始
動燃料供給装置。3. A starting plate is rotatably supported on the starting shaft, and a holding plate is rotatably and axially movable.
When the starting plate rotates the starting shaft to the forward movement position, the holding plate is rotated by the starting plate to be locked by the locking plate of the throttle valve shaft, and when the starting plate rotates the starting shaft to the backward movement position, the holding plate moves. The starting fuel supply device for a carburetor according to any one of claims 1 and 2, wherein the starting fuel supply device slides in the axial direction and is disengaged from the rotational trajectory of the locking plate of the throttle valve shaft.
始動板により始動軸を復動位置へ回転する時、保持板を
軸方向へ摺動させる、請求項１に記載の気化器の始動燃
料供給装置。 4. The cam is formed on a plate surface of a starting plate, and
When rotating the starting shaft to the return position by the starting plate, hold the holding plate.
The starting fuel supply device for a carburetor according to claim 1, wherein the starting fuel supply device is slid in the axial direction .
始動燃料通路の空気が定圧燃料室へ逆流するのを防ぐ逆
止弁を設け、該逆止弁に隣接して始動燃料量を規制する
ジエツトを設けた、請求項１に記載の気化器の始動燃料
供給装置。5. A check valve is provided in the starting fuel passage to prevent air in the starting fuel passage from flowing back to the constant pressure fuel chamber during operation of the suction pump, and the amount of starting fuel is regulated adjacent to the check valve. The starting fuel supply device for a carburetor according to claim 1, further comprising a jet.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP33209894A JP3496068B2 (en) | 1994-12-12 | 1994-12-12 | Starter fuel supply for carburetor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP33209894A JP3496068B2 (en) | 1994-12-12 | 1994-12-12 | Starter fuel supply for carburetor |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH08165954A JPH08165954A (en) | 1996-06-25 |
| JP3496068B2 true JP3496068B2 (en) | 2004-02-09 |
Family
ID=18251129
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP33209894A Expired - Fee Related JP3496068B2 (en) | 1994-12-12 | 1994-12-12 | Starter fuel supply for carburetor |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3496068B2 (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101881239B (en) * | 2010-06-23 | 2012-03-21 | 陈其安 | Simple start diaphragm type carburetor |
-
1994
- 1994-12-12 JP JP33209894A patent/JP3496068B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JPH08165954A (en) | 1996-06-25 |
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