JPS5920550A - Auxiliary fuel feeding mechanism for internal combustion engine - Google Patents
Auxiliary fuel feeding mechanism for internal combustion engineInfo
- Publication number
- JPS5920550A JPS5920550A JP12833882A JP12833882A JPS5920550A JP S5920550 A JPS5920550 A JP S5920550A JP 12833882 A JP12833882 A JP 12833882A JP 12833882 A JP12833882 A JP 12833882A JP S5920550 A JPS5920550 A JP S5920550A
- Authority
- JP
- Japan
- Prior art keywords
- auxiliary fuel
- fuel
- supply mechanism
- engine
- auxiliary
- 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.)
- Granted
Links
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
- F02M1/00—Carburettors with means for facilitating engine's starting or its idling below operational temperatures
- F02M1/16—Other means for enriching fuel-air mixture during starting; Priming cups; using different fuels for starting and normal operation
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Means For Warming Up And Starting Carburetors (AREA)
Abstract
Description
【発明の詳細な説明】
本発明は、チェンソーや刈払機のための駆動源として用
いられる２サイクルエンジンの気化器に組み込むのに好
適な補助燃料供給機構に関する。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an auxiliary fuel supply mechanism suitable for being incorporated into a carburetor of a two-stroke engine used as a drive source for a chain saw or brush cutter.
内燃機関の気化器には、前記機関の運転状況に応じて該
機関に適数の燃料を供給するための燃料供給機構が組み
込まれているが、この燃料供給機構からの燃料供給数で
は、寒冷時等におけろ機関の始動性に問題がある。The carburetor of an internal combustion engine has a built-in fuel supply mechanism for supplying an appropriate amount of fuel to the engine depending on the operating conditions of the engine. There is a problem with the startability of the engine at certain times.
この機関の始動性を高めろために、気化器の吸気通路に
凹所を形成し、該凹所内に補助燃料を保留するための多
孔質部利乞配置し、該多孔質部材に補助燃料を保持させ
ることが提案された。In order to improve the startability of this engine, a recess is formed in the intake passage of the carburetor, a porous part is placed in the recess to retain auxiliary fuel, and the auxiliary fuel is stored in the porous member. It was proposed to keep it.
前記多孔質部材に保持された補助燃料は、前記機関の始
動時に作用する吸気負圧によって前記機関に供給されろ
ことから、機関始動時の混合気濃度が高められ、これに
より前記機関の始動性が高められる。Since the auxiliary fuel held in the porous member is supplied to the engine by the intake negative pressure that acts upon starting the engine, the mixture concentration at the time of starting the engine is increased, thereby improving the startability of the engine. is enhanced.
しかしながら、前記多孔質部材は気化器の内部である吸
気通路内に設けられていることから、前記多孔質部材の
太ぎさ、′ｆなわち、補助燃料の保留量に制限２受け、
このため、従来の前記補助燃料機構では始動直後のアイ
ドリンダ運転を円滑に行なわしめるに充分な量の補助燃
料ン保留できないことがある。また前記多孔質部材が設
けられた前記吸気通路には、前記機関の通常運転時に比
較的大きな値の吸気負圧が作用することがら、この大き
な吸気負圧によって前記多孔質部材に残留する燃料が始
動に引き続くアイドリンダ運転後の補助燃料を不要とす
る通常運転時に該機関に吸引されろ恐れがあった。However, since the porous member is provided in the intake passage inside the carburetor, there is a limit to the thickness of the porous member, i.e., the amount of auxiliary fuel retained.
For this reason, the conventional auxiliary fuel mechanism may not be able to reserve a sufficient amount of auxiliary fuel to smoothly perform idler operation immediately after startup. Furthermore, since a relatively large value of intake negative pressure acts on the intake passage in which the porous member is provided during normal operation of the engine, this large intake negative pressure causes the fuel remaining in the porous member to be removed. There was a risk that the fuel would be sucked into the engine during normal operation, which does not require auxiliary fuel after idle/liner operation following startup.
従って、本発明の目的は、補助燃料の不要時にこれを前
記機関に供給−ｒろことなくかつ該機関の始動健よびこ
れに引き続くアイドリング運転２円滑に行なわしめるに
充分な量の補助燃料ケ保留し得る補助燃料供給機構を提
供することにある。Therefore, it is an object of the present invention to supply auxiliary fuel to the engine when auxiliary fuel is not needed, and to reserve a sufficient amount of auxiliary fuel to ensure smooth startup and subsequent idling of the engine. The object of the present invention is to provide an auxiliary fuel supply mechanism that obtains the desired results.
本発明は、基本的には、補助燃料送給装置から保留すべ
き補助燃料を受ける補助燃料保留手段を、その容積に大
きな制限を受ける気化器の内部に設けろことなく、該気
化器の外部に該気化器の吸入口に関連して設け、前記保
留手段乞操作手段によって前記吸入口に対向して該吸入
口ぜ近接した位置へ移動させることにより、該吸入口２
経て内燃機関に吸引される空気と共に前記保留手段の補
助燃料供給機構に供給し、また前記操作手段によって前
記保留手段２該保留手段が前記吸入口２経ろ空気流の強
い影響を受けることのない前記吸入口から離れた位置へ
移動させろことにより、不要時におけろ前記保留手段か
らの補助燃料の供給を確実に防止したことｗ％徴とする
・
さらに、本発明は、前記保留手段に送給されかつ該保留
手段から落下する補助燃料を帰還管ケ経て燃料タンクに
戻すこと乞特徴とｆる。Basically, the present invention provides an auxiliary fuel holding means for receiving auxiliary fuel to be held from an auxiliary fuel feeding device, instead of providing the auxiliary fuel storage means inside the carburetor, which is subject to a large limitation in its capacity, but outside the carburetor. The suction port 2 is provided in association with the suction port of the vaporizer, and is moved to a position opposite to the suction port and close to the suction port by the holding means operation means.
The fuel supply mechanism is supplied to the auxiliary fuel supply mechanism of the retention means together with the air sucked into the internal combustion engine through the intake port 2. By moving the auxiliary fuel to a position away from the suction port, the supply of auxiliary fuel from the storage means is reliably prevented even when unnecessary. It is also a feature that the auxiliary fuel that is collected and falls from the retention means is returned to the fuel tank via the return pipe.
本発明が特徴とするところは、本発明ケダイヤフラム式
気化器に適用した図示の実施例についての以下の説明に
より、さらに明らかとなろう。The features of the present invention will become clearer from the following description of the illustrated embodiments applied to the diaphragm type carburetor of the present invention.
本発明に係る気化器１０は、紀１図に示されているよう
に、吸気通路１２が形成された気化器本体１４と、吸気
通路１２の実効口径乞可変とするためのスロットル弁１
６とを含む０
吸気通路１２の一端は気化器本体１４の一側に開放する
吸入口１２＆に帰し、その他端は気化器本体１４の他側
に開放する排出ｒ１１２ｂに帰する・排出口１２ｂは、
断熱利ネ・１がら成る吸気管１８を介して内燃機関、例
えば２サイクルエンジン２゜の給気口２２−に連通する
。吸気通路１２における吸入口１２ａの近傍には、ベン
チュリ部２４が形成されている。As shown in Fig. 1, a carburetor 10 according to the present invention includes a carburetor main body 14 in which an intake passage 12 is formed, and a throttle valve 1 for making the effective diameter of the intake passage 12 variable.
6 and 0 One end of the intake passage 12 is connected to the suction port 12& which opens to one side of the carburetor main body 14, and the other end returns to the exhaust port 112b which opens to the other side of the carburetor main body 14. ,
It communicates via an intake pipe 18 consisting of an insulating tube 1 with an air intake 22 of an internal combustion engine, for example a two-stroke engine 2. A venturi portion 24 is formed in the intake passage 12 near the intake port 12a.
気化器１０には、燃料ポンプ２６と、周壁の一部がダイ
ヤフラム２８により形成されたダイヤフラム室３０とヲ
飾えろ従来よく知られた燃料供給機構６２が設けられて
いる。The carburetor 10 is provided with a fuel pump 26, a diaphragm chamber 30 whose peripheral wall is partially formed by a diaphragm 28, and a conventionally well-known fuel supply mechanism 62.
燃料ポンプ２６は、ダイヤフラム６４および一対のチェ
ックパルプ６６、ろ８を有するダイヤフラムポンプであ
る。ダイヤフラム６４の一側に形成されたダイヤフラム
室４０には、前記機関２０の脈動を伴なう作動圧、例え
ば２サイクルエンジンではそのクランク室圧力が管４２
を経て導入されろ。従って、前記機関２０の運転状態で
は、従来よく知られているように、燃料ポンプ２６は、
燃料タンク４４内の燃料を該燃料タンクから伸びろ燃料
管４６および一方のチェックパルプ６６を経て、ダイヤ
フラムろ４の他側に形成されたポンプ室４８に吸引し、
この吸引燃料ケ他方のチェックパルプろ８および通路５
０乞経て前記ダイヤフラム室６０に圧送する。The fuel pump 26 is a diaphragm pump having a diaphragm 64, a pair of check pulps 66, and a filter 8. In the diaphragm chamber 40 formed on one side of the diaphragm 64, the operating pressure of the engine 20 accompanied by pulsation, for example, the crank chamber pressure in a two-stroke engine, is stored in a pipe 42.
It will be introduced through. Therefore, in the operating state of the engine 20, as is well known in the art, the fuel pump 26 operates as follows.
The fuel in the fuel tank 44 is sucked from the fuel tank through the extending fuel pipe 46 and one check pulp 66 into the pump chamber 48 formed on the other side of the diaphragm filter 4,
This suction fuel is connected to the other check pulp filter 8 and the passage 5.
After 0 minutes, it is pumped into the diaphragm chamber 60.
ダイヤフラム室３０内には、通路５０の連通を断続する
ための弁部材５２が設けられている。この弁部材５２は
、ダイヤフラム２８に係合しかつ圧縮スプリング５４の
偏倚力を受ける揺動レバー５６乞介してダイヤフラム２
８に連動する・２つの燃料送給路５８．６０がダイヤフ
ラム室６０から伸長する。一方の前記送給路５８は前記
吸気通路１２に開放する複数のアイｌ−”Ｊフグポート
６２に帰し、他方の前記送給路６０は前記吸気路１２に
開放するメインポート６４に帰する。両送給路５８．６
０には、ダイヤフラム室ろ０に向けての流体の流れを阻
止するチェックパルプ６６．６８および燃料調整のため
のアジャステインダスクリュー７０，７２が。それぞれ
設けられている。A valve member 52 is provided within the diaphragm chamber 30 to connect and disconnect the passage 50 . The valve member 52 is connected to the diaphragm 28 through a swing lever 56 that engages with the diaphragm 28 and receives the biasing force of the compression spring 54.
Extending from the diaphragm chamber 60 are two fuel feed passages 58 , 60 associated with the diaphragm chamber 60 . One of the feed passages 58 returns to a plurality of eye ports 62 that open to the intake passage 12, and the other feed passage 60 returns to a main port 64 that opens to the intake passage 12. Feeding path 58.6
0 has check pulps 66, 68 that prevent the flow of fluid toward the diaphragm chamber 0, and adjuster screws 70, 72 for fuel adjustment. Each is provided.
前記機関２０の始動に引き続くアイドリング後の通常運
転では、ダイヤフラム室６０内の燃料は、］）：１記吸
気通路１２に作用する吸気負圧によって、前記吸入口１
２ａがら取り入れられた空気と共に、混合気として各５
ｒ−）６２．６４から前記機関２０にその運転状況に応
じて吸引される。また、ダイヤフラム室６０に作用する
負圧によって弁部材５２が開閉動作し、こ、ｉ′Ｌによ
りダイヤフラム室３０内には通路５０を経て断続的に燃
料が導入されろ。During normal operation after idling following the startup of the engine 20, the fuel in the diaphragm chamber 60 is caused by the intake negative pressure acting on the intake passage 12.
5 each as a mixture with the air taken in from 2a.
r-) 62.64 to the engine 20 depending on its operating condition. Further, the valve member 52 is opened and closed by the negative pressure acting on the diaphragm chamber 60, and fuel is intermittently introduced into the diaphragm chamber 30 through the passage 50 due to i'L.
従って、前記燃料供給機構６２（でよ」Ｌば、前記機関
２０の始動に引き続くアイドリング後の通常運転は、好
適に保持さ」ｔかつ制御される。Therefore, when the fuel supply mechanism 62 is turned on, normal operation after idling following the startup of the engine 20 is suitably maintained and controlled.
しかしなから、前記供給機構２６からの燃料のみでは前
記機関２０の始動性を高めかつ始動に引き続くアイドリ
ンダ運転暑良好に維持するのに充分な濃混合気を前記機
関２０に供給することはできない。However, with only the fuel from the supply mechanism 26, it is not possible to supply the engine 20 with a rich air-fuel mixture sufficient to improve the startability of the engine 20 and maintain good idle/liner operation following startup.
ために、前記気化器１０には、本発明に係る補助燃料供
給機構７４が設けられている・この補助燃料供給機構７
４は、前記気化器本体１４に形成された前記吸入口１２
ａに連通ずるチャンバ７６を規定すべ（気化器本体１４
に支持されたハウジング７８と、前記チャンバ７６内に
配置された補助燃料保留手段８０と、該補助撚ｆ−’ｌ
保留手段？操作する手段８２とを含む。Therefore, the carburetor 10 is provided with an auxiliary fuel supply mechanism 74 according to the present invention.・This auxiliary fuel supply mechanism 7
4 is the inlet port 12 formed in the carburetor main body 14;
A chamber 76 communicating with the vaporizer body 14 is defined.
a housing 78 supported by the chamber 76; an auxiliary fuel retention means 80 disposed within the chamber 76;
A means of retention? and means 82 for operating.
前記ハウジング７８は、気化器１０の吸入口１２ａに対
応する部分に、エアフィルタ８４が設げられ１こ空気取
入［コ８６ン備える。ハウジング７８は、図示の例では
気化器１０を全体的に覆うが、これに代えて、気化器１
０を全体的に覆うことなく吸入口１２ａに連通するチャ
ンバを規定するハウジングを用いることができろ。The housing 78 is provided with an air filter 84 at a portion corresponding to the suction port 12a of the carburetor 10, and has one air intake port 86. Although the housing 78 completely covers the carburetor 10 in the illustrated example, the housing 78 may alternatively cover the carburetor 10.
A housing could be used that defines a chamber that communicates with the inlet 12a without entirely covering the inlet 12a.
前記操作手段８２は、第１図に示す例では、前記気化器
本体１４に設けられた吸気通路１２の長手方向中心軸線
と平行に配置された操作ロッド８８乞備える。操作ロッ
ド８８は、ハウジング７８に設けられた軸受部９０を経
てチャンバ７６からハウジング７８の外方へ伸長し、該
操作ロッドの長手方向へ滑動可能である。チャンバ７６
内に位置する操作ロッド８８の一端には、該操作ロッド
と直角にかつ吸入口１２ａが開放する気化器本体１４の
前記−側面に対向してこれに平行に伸長する支持板９２
が固定されている。また、操作ロッド８８の曲端には、
操作ノブ９４が固定されている。In the example shown in FIG. 1, the operating means 82 includes an operating rod 88 arranged parallel to the longitudinal central axis of the intake passage 12 provided in the carburetor body 14. The operating rod 88 extends from the chamber 76 to the outside of the housing 78 via a bearing 90 provided in the housing 78 and is slidable in the longitudinal direction of the operating rod. chamber 76
At one end of the operating rod 88 located inside, there is a support plate 92 extending perpendicularly to the operating rod and parallel to and facing the side surface of the carburetor body 14 where the suction port 12a is open.
is fixed. Further, at the bent end of the operating rod 88,
An operation knob 94 is fixed.
前記保留手段８０は前記支持板９２に支持されており、
前記保留手段８ｏは、例えはスポンジ部拐、焼結金属部
材のような耐油性を有する多孔質部材から成る。この多
孔質部月８０は、支持板９２の前記吸入ＩＩ １２ ａ
に対向する面に固定されるベース部分８０ａと、該ベー
ス部分から前記吸入口１２ａＫ向けて突出する截頭円錐
形状の突起部分８０ｂとを備える。突起部分８０ｂの先
端部におけろ外径は、該先端部の吸入Ｄ Ｉ ２ ａ内
への嵌合を許すべく該吸入口の直径よりも小さい。The retaining means 80 is supported by the support plate 92,
The retaining means 8o is made of an oil-resistant porous member such as a sponge or a sintered metal member. This porous portion 80 is connected to the suction II 12a of the support plate 92.
A base portion 80a is fixed to a surface facing the suction port 12aK, and a truncated cone-shaped protrusion portion 80b protrudes from the base portion toward the suction port 12aK. The outer diameter at the tip of the protruding portion 80b is smaller than the diameter of the inlet to allow the tip to fit into the inlet D I 2 a.
従って、前記操作ツノ９４を操作者が押し込むことによ
り、第１図に仮想線で示されているように、前記保留手
段すなわち多孔質部材８０を前記吸入口１２ａに対向し
てこれに近接した位置（ＡＪへ移動させることができ、
この近接した位置（Ａ）では多孔質部月８０はその突起
部分８０ｂの先端部を吸入口１２８内に受は入れられろ
。また、操作ノブ９４を引くことｖｒ、より、多孔實部
制８０に直線径路に沿って吸入Ｄ Ｉ ２ ａから遠ざ
がろ対向へ移動させろことができ、これにより第１図に
実線で示されているように、多孔質部拐８ｏを吸入Ｌ］
１２ａがら囲１れた位Ｒ（Ｂ）に移動ざぜることがてき
ろｅ
前記多孔質部利８０の突起部分８０ｂケ不要とすること
ができるが、後述する補助燃料の前記磯閣２０への供給
６より確実に１よす上で多孔質部制に＾ＩＪ配したよ５
な突起部分ン設けろことが望ましく）。Therefore, when the operator pushes in the operating horn 94, the holding means, that is, the porous member 80 is moved to a position facing and close to the suction port 12a, as shown by the imaginary line in FIG. (Can be moved to AJ,
At this close position (A), the tip of the protruding portion 80b of the porous portion 80 is received in the suction port 128. In addition, by pulling the operation knob 94, the porous part control 80 can be moved along a straight path away from the suction D I 2 a and toward the opposite side, as shown by the solid line in FIG. Inhale the porous part 8o as shown]
The projecting portion 80b of the porous portion 80 can be made unnecessary, but it is possible to move the auxiliary fuel to the Isokaku 20 as described later. I placed ^IJ in the porous system with a definite increase of 1 from supply 6.
(It is preferable to provide a protruding part.)
前記保留手段すなわち多孔質都拐８０は、燃料送給装置
９６から補助燃料り〕洪玲を受ける。前記燃料送給装置
１ｆ９６は、図示の例では、ハウジング７８に設けられ
た手押しポンプである。The retention means 80 receives auxiliary fuel from the fuel delivery device 96. In the illustrated example, the fuel feeding device 1f96 is a hand pump provided in the housing 78.
手押しポンプ９６は、ポンプ室９８ケ規定するキャップ
状の弾性体１００と、一対のチェックバルブ１０２．１
０４とｔ備える。一方のチェックバルブ１０２が設けら
れたポンプ室９８の吸引口１０６は、吸引路１０８を経
て前記ダイヤフラム室ろ０に連通する。また、他方のチ
ェックバルブ１０４が設けられたポンプ室９８の吐出［
コ１１０には吐出管１１２が接続されており、該吐出管
の端部は、前記近接した位置にある多孔質にｌ（；ｔ＝
ｄ８０の上方で開放する。The hand pump 96 includes a cap-shaped elastic body 100 defining 98 pump chambers, and a pair of check valves 102.1.
04 and t prepared. A suction port 106 of the pump chamber 98 provided with one of the check valves 102 communicates with the diaphragm chamber filter 0 through a suction path 108 . In addition, the discharge of the pump chamber 98 where the other check valve 104 is provided
A discharge pipe 112 is connected to the pipe 110, and the end of the discharge pipe is connected to the porous material located in the vicinity of l(;t=
Open above d80.
前記機関２０の始動に先立って、前記操作ツノ９４が操
作され、該操作ノブの操作によって多孔質部４２８０が
前記近接した位＠（Ａ）に移動さ」ｔ、また前記手押し
ポンプ９８が反復して押圧操作される。この手押し７Ｊ
ソンブ９８が操作されると、該ポンプの吸引作用によっ
てダイヤフラム室ろＯ内に負圧が作用し、こ」ｔにより
前記機関２０の非作動状態すなわち前記燃料ポンプ２６
の非作動状態に拘わらず、燃料タンク４４内の燃料が燃
料ン１ソンプ２６のポンプ室４８を経てダイヤフラム室
ろＯ内に導入される。Prior to starting the engine 20, the operating knob 94 is operated, and the porous portion 4280 is moved to the adjacent position (A) by operating the operating knob, and the hand pump 98 is repeatedly operated. Press operation is performed. This hand push 7J
When the pump 98 is operated, a negative pressure acts in the diaphragm chamber O due to the suction action of the pump, which causes the engine 20 to be in a non-operating state, that is, the fuel pump 26
Regardless of the non-operating state, the fuel in the fuel tank 44 is introduced into the diaphragm chamber O through the pump chamber 48 of the fuel pump 26.
従って、手押ポンプ９６は吸引式プライマーポンプとし
て機能し、ダイヤフラム室ろ０内に燃料が満されると、
引き続（手押しポンプ９６の反復操作によって、吸引燃
料は吸引路１０８、ポンプ室９８および吐出管１１２を
経て前記近接した位置（Ａ）に在る多孔質部材８０に供
給さ−れ、該多孔質部材に吸引、保持される。Therefore, the hand pump 96 functions as a suction type primer pump, and when the diaphragm chamber 0 is filled with fuel,
Subsequently (by repeated operation of the hand pump 96, the suction fuel is supplied to the porous member 80 located at the adjacent position (A) through the suction path 108, the pump chamber 98 and the discharge pipe 112, and the porous member 80 is It is attracted and held by the member.
前記ポンプ９乙の操作によって、前記近接した位置（Ａ
）に在る多孔質部材８０に補助燃料を供給した後、前記
機関２０が例えばりコイルによって始動操作される。こ
の始動操作により１．前記吸気通路１２に負圧が作用す
ると、この吸気負圧によって前記アイドリンクポート６
２かも前記吸気通路１２に燃料が吸引さ」する。同時に
、前記ハウジング７８の空気取入口８６から吸入口１２
＆に向けて流れる空気流が生じ、この空気流と共に、吸
入口１２ａに近接した位置（Ａ＋にある多孔質部材８０
に保持された補助燃料が順次吸気通路１２に吸引されろ
。その結果、前記機関２０にその始動時に供給される混
合気濃度が高められ、前記機関の始動が容易となる。By operating the pump 9B, the adjacent position (A
), the engine 20 is started, for example by a coil. With this starting operation, 1. When negative pressure acts on the intake passage 12, this intake negative pressure causes the idle link port 6 to
2, fuel is sucked into the intake passage 12. At the same time, from the air intake port 86 of the housing 78 to the suction port 12
An air flow is generated that flows toward
The auxiliary fuel held in the air is sequentially drawn into the intake passage 12. As a result, the concentration of the air-fuel mixture supplied to the engine 20 at the time of starting the engine is increased, making it easier to start the engine.
前記機関２０の始動に引き続くアイドリング運転では、
前記保留手段８０に比較的多量の補助燃別が保留さ、ｌ
ｔていることから、前記保留手段８０かも補助燃料が引
き続いて前記機関２０に供給される。しかも前記保留手
段８０に保留さ」した燃料は、前記吸入口′１２ａに近
接する部分にある燃料から順次供給され、支持板９２に
近接−する部分にあろ燃料は吸入口１２ａに向けて流れ
る空気流の影響を受げにくいことがら、前記アイドリン
グ運転の進行に伴なって前記保留手段８ｏがもの補助燃
料供給量は好適に漸減する。In the idling operation following the start of the engine 20,
A relatively large amount of auxiliary combustion is stored in the storage means 80, l
t, the reserve means 80 continues to supply auxiliary fuel to the engine 20. In addition, the fuel held in the holding means 80 is sequentially supplied from the fuel near the suction port 12a, and the fuel near the support plate 92 is supplied to the air flowing toward the suction port 12a. Since it is not easily affected by the flow, the amount of auxiliary fuel supplied to the storage means 8o is suitably gradually reduced as the idling operation progresses.
従って、寒冷時等においても前記機関２０の始動を容易
とし、この始動に引き続いて円滑なアイ１−’リング運
転を維持′することがてきろ。Therefore, it is possible to easily start the engine 20 even in cold weather, and to maintain smooth eye 1-'ring operation following this start.
前記保留手段８０かもの補助燃料の供給ケ必要としない
アイｌ−’リング運転に移行すると、操作ノブ９４の操
作によって、前記保留手段８０は前記した吸入口１２ａ
から離れた位＠（１３）へ移動される。When the holding means 80 shifts to an engine operation in which the supply of auxiliary fuel is not required, the holding means 80 is moved to the above-mentioned intake port 12a by operating the operation knob 94.
Moved to @(13) far away from .
この離れた位置（Ｂ）では、前記保留手段８０に残留す
る補助燃料は前記吸入口１２ａへ向けて流れる空気の強
い影響力を受けることはなく、従って、残留する前記補
助燃料が前記吸入口１２’ａを経て前記機関２０に供給
されろことはない。その結果、補助燃料の供給を不要と
する運転状況での補助燃料の供給を確実に防止すること
ができ、前記機関２０の運転を良好に維持することがで
きろ。At this remote position (B), the auxiliary fuel remaining in the retention means 80 is not affected by the strong influence of the air flowing toward the suction port 12a. The engine 20 is not supplied to the engine 20 via 'a. As a result, it is possible to reliably prevent the supply of auxiliary fuel in operating conditions that do not require the supply of auxiliary fuel, and it is possible to maintain good operation of the engine 20.
前記吸入１．Ｉ］ １２ ａから離れた位置（Ｂ）に在
る前記保留手段８０かも残存する補助燃料が、振動等に
よって前記保留手段８０から落下する恐れがある。Said inhalation 1. I] There is a risk that the auxiliary fuel remaining in the holding means 80 located at a position (B) away from 12 a may fall from the holding means 80 due to vibration or the like.
この落下燃料を前記機関２０の運転に利用すべ（、第２
図に示されているように、前記ハウジング７８に、前記
落下燃料を受けろための凹所１１４ヶ形成し、該凹所の
内部と燃料タンク４４の内部とを連通ずる帰還管１１６
を経て前記燃料タンク４４に戻すことができる。This fallen fuel should be used to operate the engine 20 (second
As shown in the figure, the housing 78 is formed with 114 recesses for receiving the fallen fuel, and a return pipe 116 is provided that communicates the inside of the recess with the inside of the fuel tank 44.
The fuel can be returned to the fuel tank 44 through the process.
前記凹所１１４内に燃料タンク４４からハウジング７８
内への燃料の逆流を防止する逆止弁１１８乞設けること
が好ましい。第２図に示した逆止弁１１８は、燃料の前
記した逆流を防止し、また燃料タンク４４内の圧力がチ
ャンバ７６の圧力よりも低い場合にのみ凹所１１４内に
溜まる燃料乞燃料タンク４４に帰す。From the fuel tank 44 to the housing 78 into the recess 114
Preferably, a check valve 118 is provided to prevent backflow of fuel into the engine. A check valve 118 shown in FIG. 2 prevents the aforementioned backflow of fuel and prevents fuel from accumulating in the recess 114 only when the pressure in the fuel tank 44 is lower than the pressure in the chamber 76. Return to
第６図は、前記保留手段８０の前記した操作ケ自動的に
なす操作手段８２′θ〕例を示し、第６図に示された気
化器１０自体の構成は第１図に示したと同様である。FIG. 6 shows an example of an operating means 82'θ] that automatically performs the above-mentioned operations of the holding means 80, and the structure of the vaporizer 10 itself shown in FIG. 6 is the same as that shown in FIG. be.
操作手段８２′は、前記機関２０の温度変化によって作
動イろ感温素子１２０と、該感温素子の作動を前記保留
手段８０の揺動運動に変換する装置１２２とを含む。感
温素子１２０ば、図示の例では、一端か前記・ｊ良関２
０に接して該機関と吸気管１８との間で挾持されたバイ
メタルから成る。The operating means 82' includes a temperature-sensitive element 120 that is activated in response to a temperature change in the engine 20, and a device 122 that converts the operation of the temperature-sensitive element into a rocking motion of the holding means 80. In the example shown, one end of the temperature sensing element 120 is
It consists of a bimetal sandwiched between the engine and the intake pipe 18 in contact with the engine.
前記変換装置１２２は、一端が前記バイメタル１２０の
他端に結合されかつノ・ウジンダ７８を貫通してチャン
バ夾８に塁浩し１チヤンバ７６内に伸びる連結ロツｌ−
゛１２４と、前記チャンバ７６内に配置さ、ｈかつ枢軸
１２６乞介してノ・ウジンダ７８に揺動可能に支承され
たレバー１２８とを備え、該レバーば枢軸１２６から離
れた部分てピン１６０を介して連結ロツ）’ １２４の
他端（（枢着されている。The conversion device 122 has a connecting rod 122 connected at one end to the other end of the bimetal 120 and extending through the chamber 78 into the chamber 8 and into the chamber 76.
and a lever 128 disposed within the chamber 76 and swingably supported on the nozzle 78 via the pivot 126, the lever having a portion remote from the pivot 126 that engages the pin 160. The other end of 124 is pivotally connected through the connecting rod.
前記レバー１２８には前記保留手段８０を支持するため
の支持部９２′が設けられ、該支持部の前記吸入口１２
ａに向き合う面に前記保留手段８０が固定されている。The lever 128 is provided with a support part 92' for supporting the retention means 80, and the suction port 12 of the support part
The holding means 80 is fixed to the surface facing a.
前記機関の非動作状態では、前記バイメタル１２０は第
６図に仮想紳で示されているようにわずかな反りを生じ
、その結果、レバー１２８が仮想線で示された位置に保
持されることから、前記保留手段８０は第１図に沿って
説明したと同様な吸入口１２ａに対向してこれに近接し
た位１ｔ（Ａ’）に保持されろ。In the non-operating state of the engine, the bimetal 120 is slightly warped, as shown in phantom in FIG. 6, so that the lever 128 is held in the position shown in phantom. The retaining means 80 is held at a position 1t (A') opposite to and close to the suction port 12a as described in conjunction with FIG.
この近接した位置（Ａ′）にある保留手段８０は、前記
したと同様、補助燃料送給装置９６から供給された補助
燃料ケ前記ｈｉｔ関２０の始動時に該機関に供給し、前
記機関２０の始動χ￥’；易にしかつ始動後に引き続く
アイドリンク運転を円滑に維持するＯ
このアイドリング運転の続行によって前記機関の温度が
上宿すると、この温度上昇に伴なってバイメタル１２０
が第６図に実線で示さ」する直線形状に向けて変形する
。このバイメタル１２０の変形によって連結ロツ）１２
４はその長手方向へ沿つて図中右方へ変位し、該ロッド
に枢着されたレバー１２８は枢軸１２６の回わりに特訓
方向へ回動され、その結果、前記保留手段８０は弧状径
路に沿って第６図に符号（Ｂ′）て示さ」１ろ位＠、”
、向けて移動されろ。前記機関２０力稽由助燃別の供給
ヶ不要と才ろ温度に達すると前記保留手段８０は、前記
吸入口１２ａから離れた位置（Ｂ′）に保持されろＯ
この力ＩＬれた位置（Ｂ′）では、前記保留手段８０に
残留する補助燃料が前記吸入口１２ａ５に吸引さＡ′シ
ろ程に該吸入口へ向けて流れろ空気流の強い影響を受け
ろことはフエ（、従って、不要時におけろ補助燃料σつ
供給を確実に防止することができろ。As described above, the holding means 80 located at the adjacent position (A') supplies the auxiliary fuel supplied from the auxiliary fuel supply device 96 to the engine when the hit connection 20 is started. Starting χ￥'; To facilitate and maintain smooth idling operation that continues after starting O When the temperature of the engine rises due to the continuation of this idling operation, the bimetal 120
is deformed toward the straight line shape shown by the solid line in FIG. Connected by deformation of this bimetal 120) 12
4 is displaced to the right in the figure along its longitudinal direction, and the lever 128 pivotally connected to the rod is rotated in the training direction about the pivot shaft 126, so that the retaining means 80 is moved along the arcuate path. In Fig. 6, the symbol (B') indicates "1st place@,"
, move towards. When the engine 20 reaches a temperature at which no separate supply of auxiliary combustion is required, the holding means 80 is held at a position (B') away from the suction port 12a. In '), the auxiliary fuel remaining in the retention means 80 is sucked into the suction port 12a5, and flows toward the suction port as much as A'. It is possible to reliably prevent the supply of auxiliary fuel.
第１図ないし第６図には、前記保留手段８０を吸入口１
２ａが設けられた気化器本体１４の前記−側面から離れ
ろ方向へ移動可能とした例を示したが、前記保留手段８
０乞前記−Ｉｌｌ、１１面と平行に移動可能とすること
ができろ・
また、前記したところでは、本発明に係る補助燃料供給
機構７ダイヤフラム式気化器に組み込んだ例について説
明したが、このダイヤノラム式気化器に阻らずフロート
式気化器のよ５な秤々の気化器に組み込むことができ、
さらに、前記補助燃料送給装置をプライマーポンプとは
関連なく設けろことができろ。1 to 6, the retaining means 80 is shown in the suction port 1.
Although an example has been shown in which the retaining means 8 is movable in the direction away from the side surface of the vaporizer main body 14 on which the retaining means 8 is provided.
It should be possible to make it movable in parallel to the 0-Ill and 11 planes.Also, in the above, an example was explained in which the auxiliary fuel supply mechanism 7 according to the present invention was incorporated into a diaphragm type carburetor. It can be incorporated into five types of vaporizers, such as float-type vaporizers, without being hindered by diamondorum-type vaporizers.
Furthermore, the auxiliary fuel delivery device could be provided independently of the primer pump.
本発明によれば、前記したように、補助燃料保留手段が
気化器本体の外部に設けられろことがら、前記保留手段
の容積の増大ぞ図り、これにより機関の始動に引き続く
アイｌ−’リング運転時にも供給し得るに充分１．１′
、量の補助燃料を保留することができろ。従って、前記
機関の始動を容易にすると共に該始動に引き続くアイド
リング運転２円滑に行なわしめることができる。According to the present invention, as described above, since the auxiliary fuel storage means is provided outside the carburetor main body, the capacity of the storage means is increased, thereby making it possible to maintain the eyelid ring after starting the engine. 1.1' enough to supply even during operation
, a quantity of auxiliary fuel could be withheld. Therefore, the engine can be started easily and the idling operation 2 that follows the engine start can be performed smoothly.
さらに、前記保留手段に残存する補助燃料の不要時にお
けろ供給を確実に防止できろことから、この不要な補助
燃料の供給による前記機関の不調欠相くことなく、該機
関の運転状態を良好に維持することができろ。Furthermore, since it is possible to reliably prevent the supply of the auxiliary fuel remaining in the storage means when it is not needed, the engine will not malfunction due to the supply of unnecessary auxiliary fuel, and the operating condition of the engine will be maintained in good condition. Be able to maintain it.
第１図は本発明に係る補助燃料供給機溝が組み１Δまれ
だ気化器２示す縦断面であり、第２図は本発明の他の実
施例を示す部分断面図であり、第３図は本発明のさらに
他の実施例を示す第１図と同様な図面である。
１０：気化器、１２：吸気通路、１２ａ：吸入口、２０
：内燃機関、ろ２：燃料供給機構、４４：燃料タンク、
７４：補助燃料供給機構、７６：チャンバ、７８：ハウ
ジング、８０：ネ由助燃料保留手段、８０ａ：ベース部
分、８０ｂ＝突起部分、８２．８２′：操作手段、８６
：空気取入１」、８８：操作ロッド、９６：補助燃料送
給装置、１１４：凹所、１１６：帰還管、１１８：逆止
弁、１２０：感温素子、１２２：変換装置、（Ａ＋、（
Ａ’）：近接した位置、（１３）、ＣＢ’）：離れた位
置。
代理人 弁理士 松 永 宣 行FIG. 1 is a longitudinal section showing a 1Δ rare carburetor 2 with an auxiliary fuel feeder groove according to the present invention, FIG. 2 is a partial sectional view showing another embodiment of the present invention, and FIG. 2 is a drawing similar to FIG. 1 showing still another embodiment of the present invention. 10: Carburetor, 12: Intake passage, 12a: Inlet, 20
: internal combustion engine, filter 2: fuel supply mechanism, 44: fuel tank,
74: Auxiliary fuel supply mechanism, 76: Chamber, 78: Housing, 80: Auxiliary fuel storage means, 80a: Base portion, 80b = Projection portion, 82.82': Operating means, 86
: Air intake 1'', 88: Operating rod, 96: Auxiliary fuel feeding device, 114: Recess, 116: Return pipe, 118: Check valve, 120: Temperature sensing element, 122: Conversion device, (A+, (
A'): close position, (13), CB'): distant position. Agent Patent Attorney Nobuyuki Matsunaga
Claims (1)
口が設けられた気化器を備えろ内燃７機関の始動を容易
にすべ（該内燃機関に補助燃料を供給する機構であって
、空気取入口を有し、前記吸入口に連通ずるチャンバ乞
規定するハウジングと、前記チャンバ内にあって前記吸
入口に対向してこれに近接した位置と前記吸入口から離
れた位置との間で変位可能に支承された多孔質部材から
成る補助燃料保留手段と、該補助燃料保留手段に燃ｆ−
１を送給する装置と、前記補助燃料保留手段を前記近接
した位置および離れた位置へ移動させるための操作手段
と乞含む、内燃機関のための補助燃料供給機構。 （２） 前記多孔質部材はベース部分と、該ベース部
分の前記吸入口に対向する面から該吸入口へ嵌入可能に
突出する突起部分とを備える特許請求の範囲第（１）項
に記載の補助燃料供給機構。 （３）前記操作手段は一端が前記多孔質部材に連結され
また他端が前記ハウジングを貫通して該ハウジングの外
方に伸びる操作ロッドを備え、該操作ロッドの手動操作
によって前記補助燃料保留手段は直線径路に沿って移動
される特許請求の範囲第（１）項に記載の補助燃料供給
機構。 （４）前記操作手段は前記内燃機関の温度変化によって
作動する感温素子と、該感温素子の作動乞前記補助燃料
保留手段の揺動運動に変換する装置と欠備え、前記内燃
機関の温度変化によって前記補助燃料保留手段は弧状径
路に沿って移動される特許請求の範囲第（１１項に記載
の補助燃料供給機構。 （５）燃料供給機構および空気を取り入れるための吸入
口が設けられた気化器を備える内燃機関の始動を容易に
すべく該内燃機関に補助燃料を供給する機構で、あって
、空気取入口を有し、前記吸入口に連通ずるチャンバを
規定するハウジングと、前記チャンバ内にあって前記吸
入口に対向してこれに近接した位置と前記吸入口から離
れた位置との間で変位可能に支承された多孔質部材から
成る補助燃料保留手段と、該補助燃料保留手段に燃料タ
ンク内の燃料を送給する装置と、前記補助燃料保留手段
化前記近接した位置および離れた位置へ移動させるため
の操作手段と、前記補助燃料保留手段から落下する燃料
を受けろ磨（前記ハウジングに形成された凹所と、該凹
所内に溜まる燃料を前記燃料タンクに戻すための帰還管
とを含む、内燃機関のための補助燃料供給機構。 （６）前記凹所は前記離れた位置にある前記補助燃料保
留手段から落下する燃料を受けるべく該補助燃料保留手
段の前記離れた位置に対応する位置に設けられている特
許請求の範囲第（５）項に記載の補助燃料供給機構。 （７）前記ハウジングは前記凹所に、前記燃料タンクか
ら前記ハウジングに向けての燃料の逆流を阻止するため
の逆上弁を備える特許請求の範囲第（５）項に記載の補
助燃料供給機構。[Scope of Claims] (11) A fuel supply mechanism and a carburetor provided with an intake port for taking in air. a housing defining a chamber having an air intake and communicating with the suction port; and a housing located within the chamber opposite to and proximate to the suction port, and a position remote from the suction port. an auxiliary fuel retention means made of a porous member displaceably supported between the auxiliary fuel retention means;
1. An auxiliary fuel supply mechanism for an internal combustion engine, comprising a device for delivering auxiliary fuel 1 and operating means for moving said auxiliary fuel retention means to said proximate and remote positions. (2) The porous member includes a base portion and a protruding portion that projects from a surface of the base portion facing the suction port so as to be fit into the suction port. Auxiliary fuel supply mechanism. (3) The operating means includes an operating rod having one end connected to the porous member and the other end penetrating the housing and extending outward from the housing, and the auxiliary fuel storage means is actuated by manual operation of the operating rod. The auxiliary fuel supply mechanism according to claim 1, wherein the fuel supply mechanism is moved along a straight path. (4) The operating means includes a temperature sensing element that operates according to a temperature change of the internal combustion engine, and a device that converts the operation of the temperature sensing element into a rocking motion of the auxiliary fuel storage means, and the temperature of the internal combustion engine The auxiliary fuel supply mechanism according to claim 11, wherein the auxiliary fuel retention means is moved along an arcuate path by the change. (5) A fuel supply mechanism and an inlet for taking in air are provided. A mechanism for supplying auxiliary fuel to an internal combustion engine including a carburetor to facilitate starting of the engine, the housing comprising: a housing defining a chamber having an air intake and communicating with the intake; auxiliary fuel retention means made of a porous member displaceably supported between a position facing and close to the suction port and a position remote from the suction port; and the auxiliary fuel storage means. a device for feeding the fuel in the fuel tank to the auxiliary fuel storage means; an operation means for moving the auxiliary fuel storage means to the adjacent position and a remote position; An auxiliary fuel supply mechanism for an internal combustion engine, comprising a recess formed in the housing and a return pipe for returning fuel collected in the recess to the fuel tank. (6) the recess is located at the remote location; The auxiliary fuel supply mechanism according to claim 5, wherein the auxiliary fuel supply mechanism is provided at a position corresponding to the remote position of the auxiliary fuel storage means to receive the fuel falling from the auxiliary fuel storage means located at the auxiliary fuel storage means. (7) The auxiliary fuel supply mechanism according to claim (5), wherein the housing includes a backflow valve in the recess for preventing backflow of fuel from the fuel tank toward the housing. .
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP12833882A JPS5920550A (en) | 1982-07-24 | 1982-07-24 | Auxiliary fuel feeding mechanism for internal combustion engine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP12833882A JPS5920550A (en) | 1982-07-24 | 1982-07-24 | Auxiliary fuel feeding mechanism for internal combustion engine |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS5920550A true JPS5920550A (en) | 1984-02-02 |
| JPS6238548B2 JPS6238548B2 (en) | 1987-08-18 |
Family
ID=14982321
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP12833882A Granted JPS5920550A (en) | 1982-07-24 | 1982-07-24 | Auxiliary fuel feeding mechanism for internal combustion engine |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS5920550A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6235048A (en) * | 1985-08-09 | 1987-02-16 | Walbro Far East Inc | Fuel supply device for starting portable service machine engine |
| US5226538A (en) * | 1992-07-29 | 1993-07-13 | The Procter & Gamble Company | Filled package exhibiting a substantially colorless transparent appearance |
-
1982
- 1982-07-24 JP JP12833882A patent/JPS5920550A/en active Granted
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6235048A (en) * | 1985-08-09 | 1987-02-16 | Walbro Far East Inc | Fuel supply device for starting portable service machine engine |
| JPH0226059B2 (en) * | 1985-08-09 | 1990-06-07 | Walbro Far East | |
| US5226538A (en) * | 1992-07-29 | 1993-07-13 | The Procter & Gamble Company | Filled package exhibiting a substantially colorless transparent appearance |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS6238548B2 (en) | 1987-08-18 |
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