JPH04339161A - Fuel adjusting mechanism of diaphragm type carburetor - Google Patents
Fuel adjusting mechanism of diaphragm type carburetorInfo
- Publication number
- JPH04339161A JPH04339161A JP2288891A JP2288891A JPH04339161A JP H04339161 A JPH04339161 A JP H04339161A JP 2288891 A JP2288891 A JP 2288891A JP 2288891 A JP2288891 A JP 2288891A JP H04339161 A JPH04339161 A JP H04339161A
- Authority
- JP
- Japan
- Prior art keywords
- fuel
- passage
- inlet passage
- needle valve
- 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.)
- Pending
Links
- 239000000446 fuel Substances 0.000 title claims abstract description 145
- 239000006185 dispersion Substances 0.000 abstract 1
- 239000002828 fuel tank Substances 0.000 description 5
- 235000001674 Agaricus brunnescens Nutrition 0.000 description 2
- 238000002485 combustion reaction Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 230000037431 insertion Effects 0.000 description 1
- 238000003780 insertion Methods 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 230000000717 retained effect Effects 0.000 description 1
Landscapes
- Means For Warming Up And Starting Carburetors (AREA)
Abstract
Description
【０００１】0001
【産業上の利用分野】本発明はチエンソー、刈払機など
の携帯作業機に搭載される２サイクル内燃機関のダイヤ
フラム型気化器、特に燃料蒸気、気泡、異物などの停滞
がなく、燃料の流れが円滑で常に安定した燃料量（流量
）が得られる、ダイヤフラム型気化器の燃料調整機構に
関するものである。[Industrial Application Field] The present invention is applicable to a diaphragm type carburetor for a two-stroke internal combustion engine installed in a portable working machine such as a chain saw or a brush cutter. This invention relates to a fuel adjustment mechanism for a diaphragm carburetor that provides a smooth and always stable fuel amount (flow rate).
【０００２】0002
【従来の技術】図４に示すように、この種のダイヤフラ
ム型気化器は、気化器本体１７の円筒部１９に、スロツ
トル孔２２を有するロータリ絞り弁２０が回動可能かつ
上下移動可能に嵌合される。ロータリ絞り弁２０の上端
の軸部１５は円筒部１９を閉鎖する蓋板１６に支持され
、かつ軸部１５に結合したスロツトルレバー１２の下面
のカム面１３が、蓋板１６に支持したボール１４にばね
１８の力により係合される。軸部１５に調整可能に螺合
支持した棒弁２１がロータリ絞り弁２０のスロツトル孔
２２へ突出され、かつ燃料ノズル３９へ嵌挿される。
トリガレバーにより遠隔的にスロツトルレバー１２を回
動すると、ロータリ絞り弁２０と一緒に棒弁２１が上下
移動し、燃料ノズル３９の燃料噴孔３９ａの開口面積が
加減される。2. Description of the Related Art As shown in FIG. 4, in this type of diaphragm type carburetor, a rotary throttle valve 20 having a throttle hole 22 is fitted into a cylindrical portion 19 of a carburetor body 17 so as to be rotatable and movable up and down. will be combined. The shaft portion 15 at the upper end of the rotary throttle valve 20 is supported by a cover plate 16 that closes the cylindrical portion 19, and the cam surface 13 on the lower surface of the throttle lever 12 connected to the shaft portion 15 is connected to a ball supported by the cover plate 16. 14 by the force of a spring 18. A rod valve 21 that is adjustable and threadedly supported on the shaft portion 15 is projected into the throttle hole 22 of the rotary throttle valve 20 and inserted into the fuel nozzle 39. When the throttle lever 12 is remotely rotated by the trigger lever, the rod valve 21 moves up and down together with the rotary throttle valve 20, and the opening area of the fuel injection hole 39a of the fuel nozzle 39 is adjusted.
【０００３】燃料ノズル３９は円筒部１９の底部中心に
設けた円筒部２３に嵌合支持される。円筒部２３から径
方向へ延びる円筒部３８、円筒部２８、ねじ孔２９が気
化器本体１７に形成され、円筒部２８が通路３７、逆止
弁３６を経て燃料供給機構Ｂの定圧燃料室３５へ連通可
能とされる。定圧燃料室３５から燃料ノズル３９への燃
料量を加減するために、ねじ孔２９に燃料調整針弁３０
が螺合され、弛止めばね３１により保持される。The fuel nozzle 39 is fitted and supported by a cylindrical portion 23 provided at the center of the bottom of the cylindrical portion 19 . A cylindrical portion 38 extending in the radial direction from the cylindrical portion 23, a screw hole 29 are formed in the carburetor body 17, and the cylindrical portion 28 passes through a passage 37 and a check valve 36 to the constant pressure fuel chamber 35 of the fuel supply mechanism B. It is possible to communicate with In order to adjust the amount of fuel flowing from the constant pressure fuel chamber 35 to the fuel nozzle 39, a fuel adjustment needle valve 30 is installed in the screw hole 29.
are screwed together and held by a locking spring 31.
【０００４】定圧燃料室３５を備える燃料供給機構Ｂは
、中間体４９とカバー５０との間にダイヤフラム４１を
挟んで、定圧燃料室３５と大気室４２を区画される。
定圧燃料室３５に支軸３３によりレバー３４が支持され
、レバー３４の一端がダイヤフラム４１の突片にばねの
力により付勢される一方、レバー３４の他端に支持した
針弁型の燃料流入弁１０が、燃料ポンプＡの吐出通路９
の端部に配設される。定圧燃料室３５は通路４３、茸弁
の周縁部に形成された逆止弁４５、プライマポンプ４４
のスポイド４８の内空部、茸弁の軸部に形成された逆止
弁４６、通路４７を経て燃料タンク２へ連通可能とされ
る。機関の始動時、プライマポンプ４４の操作により燃
料タンク２の燃料は、燃料タンク２から燃料ポンプＡを
経て定圧燃料室３５へ吸引される。The fuel supply mechanism B, which includes a constant pressure fuel chamber 35, is divided into a constant pressure fuel chamber 35 and an atmospheric chamber 42 by sandwiching a diaphragm 41 between an intermediate member 49 and a cover 50. A lever 34 is supported by a support shaft 33 in a constant pressure fuel chamber 35, and one end of the lever 34 is biased by the force of a spring against a projecting piece of a diaphragm 41, while a needle valve type fuel inflow supported at the other end of the lever 34 The valve 10 is connected to the discharge passage 9 of the fuel pump A.
located at the end of the The constant pressure fuel chamber 35 includes a passage 43, a check valve 45 formed at the periphery of the mushroom valve, and a primer pump 44.
It is possible to communicate with the fuel tank 2 through the inner space of the dropper 48, a check valve 46 formed in the shaft of the mushroom valve, and a passage 47. When the engine is started, fuel in the fuel tank 2 is sucked from the fuel tank 2 through the fuel pump A into the constant pressure fuel chamber 35 by operating the primer pump 44.
【０００５】燃料ポンプＡは気化器本体１７と中間体４
９の間にダイヤフラム２５を挟んで、機関のクランク室
に連通する脈動圧導入室２４とポンプ室７を区画される
。ダイヤフラム２５が上下に振動すると、燃料タンク２
の燃料が通路３、逆止弁５、通路６を経てポンプ室７へ
吸い込まれ、さらにポンプ室７から逆止弁８、吐出通路
９、燃料流入弁１０を経て定圧燃料室３５へ吐き出され
る。定圧燃料室３５に燃料が満されると、ダイヤフラム
４１が下降し、レバー３４により燃料流入弁１０が押し
上げられ、吐出通路９の端部が閉鎖される。こうして、
定圧燃料室３５に一定圧下の燃料が保留される。[0005] The fuel pump A includes a carburetor body 17 and an intermediate body 4.
9 with a diaphragm 25 in between, a pulsating pressure introduction chamber 24 communicating with the engine crank chamber and a pump chamber 7 are separated. When the diaphragm 25 vibrates up and down, the fuel tank 2
The fuel is sucked into the pump chamber 7 through the passage 3, the check valve 5, and the passage 6, and is further discharged from the pump chamber 7 through the check valve 8, the discharge passage 9, and the fuel inlet valve 10 into the constant pressure fuel chamber 35. When the constant pressure fuel chamber 35 is filled with fuel, the diaphragm 41 is lowered, the fuel inlet valve 10 is pushed up by the lever 34, and the end of the discharge passage 9 is closed. thus,
Fuel under a constant pressure is retained in the constant pressure fuel chamber 35.
【０００６】上述のダイヤフラム型気化器は、携帯作業
機に付け替えられるカツターなどの負荷条件や周囲温度
に対応して、燃料量が燃料調整針弁３０により加減され
る。スロツトル孔２２の吸気負圧により、定圧燃料室３
５から逆止弁３６を経て燃料ノズル３９へ吸引される燃
料量は、円筒部２８，３８の間のテーパ孔と燃料調整針
弁３０のテーパ部との隙間により決まる。定圧燃料室３
５からの燃料が円筒部２８と燃料調整針弁３０の隙間へ
流れる時、流れの方向が直角に変化するだけでなく、通
路面積が燃料調整針弁３０と円筒部３８，２８の間のテ
ーパ部との間で絞られるためによどみが生じ、前記隙間
に気泡や異物などが溜りやすい。さらに、燃料調整針弁
３０と円筒部２８との隙間は、通路３７からノズル通路
５５の方へ延びるだけでなく、反対方向（図において右
方）へも延びており、燃料と一緒に右方へ流れた気泡や
異物は一層隙間に溜りやすい。[0006] In the above-mentioned diaphragm type carburetor, the amount of fuel is adjusted by the fuel adjustment needle valve 30 in accordance with the load conditions of a cutter or the like to be replaced with a portable working machine and the ambient temperature. Due to the intake negative pressure of the throttle hole 22, the constant pressure fuel chamber 3
The amount of fuel sucked into the fuel nozzle 39 from the cylindrical portion 5 through the check valve 36 is determined by the gap between the tapered hole between the cylindrical portions 28 and 38 and the tapered portion of the fuel adjustment needle valve 30. Constant pressure fuel chamber 3
When the fuel from 5 flows into the gap between the cylindrical part 28 and the fuel adjustment needle valve 30, not only does the direction of flow change at right angles, but also the passage area changes due to the taper between the fuel adjustment needle valve 30 and the cylindrical parts 38, 28. Stagnation occurs due to the narrowing between the parts, and air bubbles and foreign matter tend to accumulate in the gaps. Further, the gap between the fuel adjustment needle valve 30 and the cylindrical portion 28 not only extends from the passage 37 toward the nozzle passage 55, but also extends in the opposite direction (to the right in the figure), so that the gap between the fuel adjustment needle valve 30 and the cylindrical portion 28 extends not only from the passage 37 toward the nozzle passage 55, but also in the opposite direction (to the right in the figure). Air bubbles and foreign matter that flow into the gap are more likely to accumulate in the gap.
【０００７】また、携帯作業機では燃料タンクが小さい
こともあつて、作業中に燃料切れを起し、機関が停止し
た時に、円筒部２８と燃料調整針弁３０の隙間へ空気が
浸入すると、その後の機関運転でも空気が気泡となつて
滞留し、ノズル通路５５へ抜け出ないことがある。この
気泡はノズル通路５５から円筒部３８，２８へ作用する
脈動吸気負圧の変化（最高値）を緩和する。つまり、ノ
ズル通路５５から円筒部３８，２８へ及ぶ吸気負圧が弱
くなり、隙間に溜つた気泡や異物の抜けが悪くなる。Furthermore, since the fuel tank of a portable working machine is small, if the engine runs out of fuel during work and the engine stops, air may enter the gap between the cylindrical portion 28 and the fuel adjustment needle valve 30. Even when the engine is operated thereafter, the air may become bubbles and remain, and may not escape to the nozzle passage 55. These air bubbles alleviate the change (maximum value) in the pulsating intake negative pressure acting from the nozzle passage 55 to the cylindrical portions 38, 28. In other words, the intake negative pressure from the nozzle passage 55 to the cylindrical parts 38, 28 becomes weaker, making it difficult to escape air bubbles and foreign matter accumulated in the gaps.
【０００８】特願昭６３−２１０１１７ 号公報に開示
されるダイヤフラム型気化器の燃料調整機構では、定圧
燃料室と燃料ノズルを結ぶ燃料通路に燃料通路を横切る
燃料調整管を設け、燃料調整管の定圧燃料室側に軸方向
に延びるスリツトを、他方側に円孔を設け、燃料調整管
に燃料調整棒弁を軸方向移動調節可能に挿通したものと
なつている。In the fuel adjustment mechanism for a diaphragm type carburetor disclosed in Japanese Patent Application No. 63-210117, a fuel adjustment pipe is provided in the fuel passage connecting the constant pressure fuel chamber and the fuel nozzle, and the fuel adjustment pipe crosses the fuel passage. A slit extending in the axial direction is provided on the constant pressure fuel chamber side, a circular hole is provided on the other side, and a fuel adjustment rod valve is inserted into the fuel adjustment pipe so that its movement in the axial direction can be adjusted.
【０００９】上述のダイヤフラム型気化器の燃料調整機
構によれば、燃料調整針弁の付近で燃料が円滑に流れる
ので、気泡、異物などが停滞し流量を変化させるという
問題が改善される。しかし、燃料調整棒弁のねじ込み量
により燃料量を調整した時に、燃料調整棒弁の開度にバ
ラツキが生じやすいという問題がある。気化器は工場で
真空ポンプなどにより予め燃料量を設定して出荷するも
のであるから、燃料調整棒弁を一杯にねじ込んでから所
定量だけねじ戻せば、バラツキがなく所定の燃料量が得
られることが望ましい。[0009] According to the above-mentioned fuel adjustment mechanism of the diaphragm type carburetor, the fuel flows smoothly near the fuel adjustment needle valve, so that the problem of air bubbles, foreign matter, etc. becoming stagnant and changing the flow rate can be solved. However, there is a problem in that when the amount of fuel is adjusted by the screwing amount of the fuel adjustment rod valve, variations tend to occur in the opening degree of the fuel adjustment rod valve. Carburetors are shipped with the amount of fuel set in advance using a vacuum pump etc. at the factory, so by screwing the fuel adjustment rod valve all the way in and then unscrewing it by the specified amount, you can obtain the specified amount of fuel without any variation. This is desirable.
【００１０】0010
【発明が解決しようとする問題点】本発明の目的は上述
の問題に鑑み、燃料蒸気、気泡、異物などが抜けやすく
、かつ燃料量の設定が容易で、バラツキが少ない、ダイ
ヤフラム型気化器の燃料調整機構を提供することにある
。[Problems to be Solved by the Invention] In view of the above-mentioned problems, the object of the present invention is to provide a diaphragm type carburetor that allows fuel vapor, bubbles, foreign matter, etc. to escape easily, and allows for easy setting of the fuel amount with little variation. The object of the present invention is to provide a fuel adjustment mechanism.
【００１１】[0011]
【問題点を解決するための手段】上記目的を達成するた
めに、本発明の構成は定圧燃料室と燃料ノズルを結ぶ燃
料通路に燃料調整針弁を設けたものにおいて、燃料ノズ
ルの基端部から同軸に延びる出口通路の内周壁に定圧燃
料室から延びる入口通路を開口し、入口通路の開口端部
へ、入口通路と反対側の弁支持孔から出口通路を横切る
燃料調整針弁を突出させたものである。[Means for Solving the Problems] In order to achieve the above object, the present invention has a configuration in which a fuel adjustment needle valve is provided in a fuel passage connecting a constant pressure fuel chamber and a fuel nozzle, and a fuel adjustment needle valve is provided at the base end of the fuel nozzle. An inlet passage extending from the constant pressure fuel chamber is opened in the inner circumferential wall of the outlet passage coaxially extending from the outlet passage, and a fuel adjustment needle valve is protruded from the valve support hole on the opposite side of the inlet passage to the open end of the inlet passage and crosses the outlet passage. It is something that
【００１２】0012
【作用】定圧燃料室の燃料は、入口通路から燃料調整針
弁の先端側へ流れ、入口通路の端部のテーパ孔を経て出
口通路へ流入し、燃料ノズルから吸気通路へ吸引される
。定圧燃料室からの燃料は入口通路において、燃料調整
針弁の半球状の先端軸部で周囲へ拡がりながらテーパ孔
を経て、通路面積が広く入口通路と交差する出口通路へ
流入するので、燃料の流れが円滑であり、気泡や異物な
どの停滞する恐れがない。[Operation] Fuel in the constant pressure fuel chamber flows from the inlet passage toward the tip of the fuel adjustment needle valve, passes through the tapered hole at the end of the inlet passage, flows into the outlet passage, and is sucked into the intake passage from the fuel nozzle. In the inlet passage, fuel from the constant pressure fuel chamber spreads around the hemispherical tip shaft of the fuel adjustment needle valve, passes through the tapered hole, and flows into the outlet passage, which has a wide passage area and intersects with the inlet passage. The flow is smooth and there is no risk of stagnation due to bubbles or foreign matter.
【００１３】燃料量の設定は、燃料調整針弁をテーパ部
が入口通路の端部のテーパ孔へ当るまでねじ込んだ後、
所定の回転量だけねじ戻して行う。To set the fuel amount, screw the fuel adjustment needle valve until the tapered part touches the tapered hole at the end of the inlet passage, and then
This is done by unscrewing the screw by the specified amount of rotation.
【００１４】[0014]
【発明の実施例】図２に示すように、本発明によれば、
燃料ノズル３９の基端部から同軸方向（図２において下
方）へ延びる出口通路５５が、気化器本体１７に形成さ
れ、出口通路５５を横切るように、気化器本体１７に入
口通路５３と弁支持孔５７とねじ孔２９が同軸に設けら
れる。入口通路５３は傾斜した通路５２を経て、定圧燃
料室３５へ連通される。入口通路５３が出口通路５５へ
開口する端部は、テーパ孔５４とされる。Embodiments of the Invention As shown in FIG. 2, according to the present invention,
An outlet passage 55 extending coaxially (downward in FIG. 2) from the base end of the fuel nozzle 39 is formed in the carburetor body 17, and an inlet passage 53 and a valve support are formed in the carburetor body 17 so as to cross the outlet passage 55. The hole 57 and the screw hole 29 are provided coaxially. Inlet passage 53 communicates with constant pressure fuel chamber 35 via inclined passage 52 . The end where the inlet passage 53 opens to the outlet passage 55 is a tapered hole 54 .
【００１５】図２，３に示すように、燃料調整針弁３０
は基端部をねじ孔２９に螺合され、中間軸部６０を隙間
なく弁支持孔５７へ嵌挿される。さらに、燃料調整針弁
３０はテーパ部５９のところから先端側を、入口通路５
３の内径よりも小径で先細りの先端軸部５８とされる。
先端軸部５８の端面は半球面とすることが好ましい。入
口通路５３から出口通路５５へ流れる燃料量は、燃料調
整針弁３０のテーパ部５９が入口通路５３のテーパ孔５
４に衝合する位置（図２参照）から、所定量ねじ戻して
（図３参照）設定する。As shown in FIGS. 2 and 3, the fuel adjustment needle valve 30
The base end portion of the valve is screwed into the screw hole 29, and the intermediate shaft portion 60 is inserted into the valve support hole 57 without any gap. Furthermore, the fuel adjustment needle valve 30 extends from the tapered portion 59 to the inlet passage 5.
The tip shaft portion 58 has a smaller diameter than the inner diameter of No. 3 and is tapered. The end surface of the tip shaft portion 58 is preferably a hemispherical surface. The amount of fuel flowing from the inlet passage 53 to the outlet passage 55 is determined by the amount of fuel that flows into the outlet passage 55 from the taper part 59 of the fuel adjustment needle valve 30.
4 (see Fig. 2), unscrew it by a predetermined amount (see Fig. 3) and set.
【００１６】本発明は上述のように構成することにより
、定圧燃料室３５の燃料が逆止弁３６、通路５２を経て
、入口通路５３へ流れ、先端軸部５８のところで径外方
へ拡がり、入口通路５３と先端軸部５８の隙間を通り、
テーパ孔５４から広い出口通路５５へ流入する。燃料は
入口通路５３を出口通路５５までほぼ真直ぐに流れ、燃
料がテーパ孔５４を通過すると、出口通路５５が広くな
つているので、流れが非常に円滑であり、気泡や異物が
停滞する恐れがない。[0016] With the present invention configured as described above, the fuel in the constant pressure fuel chamber 35 flows through the check valve 36 and the passage 52 to the inlet passage 53, and expands radially outward at the tip shaft portion 58. Passing through the gap between the inlet passage 53 and the tip shaft portion 58,
It flows from the tapered hole 54 into a wide outlet passage 55 . The fuel flows almost straight through the inlet passage 53 to the outlet passage 55, and when the fuel passes through the tapered hole 54, the outlet passage 55 is wide, so the flow is very smooth, and there is no risk of air bubbles or foreign matter becoming stagnant. do not have.
【００１７】[0017]
【発明の効果】本発明は上述のように、定圧燃料室と燃
料ノズルを結ぶ燃料通路に燃料調整針弁を設けたものに
おいて、燃料ノズルの基端部から同軸に延びる出口通路
の内周壁に定圧燃料室から延びる入口通路を開口し、入
口通路の開口端部へ、入口通路と反対側の弁支持孔から
出口通路を横切る燃料調整針弁を突出させものであるか
ら、定圧燃料室の燃料は燃料調整針弁が嵌挿される入口
通路をほぼ真直ぐに流れ、燃料ノズルから同軸に延びる
出口通路へ流入し、燃料ノズルから吸気通路へ吸引され
る。定圧燃料室からの燃料は、入口通路において燃料調
整針弁の先端軸部で周囲へ拡がりながら、通路面積が広
く入口通路と交差する出口通路へ流入するので、燃料の
流れが円滑であり、気泡や異物が停滞する恐れがない。Effects of the Invention As described above, the present invention provides a fuel adjustment needle valve in a fuel passage connecting a constant pressure fuel chamber and a fuel nozzle, in which a fuel adjustment needle valve is provided on the inner circumferential wall of the outlet passage extending coaxially from the base end of the fuel nozzle. The inlet passage extending from the constant pressure fuel chamber is opened, and a fuel adjustment needle valve extending across the outlet passage is protruded from the valve support hole on the opposite side of the inlet passage to the open end of the inlet passage. The fuel flows almost straight through the inlet passage into which the fuel adjustment needle valve is fitted, flows from the fuel nozzle into the coaxially extending outlet passage, and is sucked from the fuel nozzle into the intake passage. The fuel from the constant pressure fuel chamber spreads around the tip of the fuel adjustment needle valve in the inlet passage, and then flows into the outlet passage, which has a wide passage area and intersects with the inlet passage, so the fuel flows smoothly and there are no bubbles. There is no risk of stagnation of particles or foreign objects.
【００１８】入口通路の端部のテーパ孔へ当るまで燃料
調整針弁をねじ込んだ後、所定の回転量だけ燃料調整針
弁をねじ戻せば、燃料量を設定でき、バラツキがなく、
調整が容易である。After screwing the fuel adjustment needle valve until it touches the tapered hole at the end of the inlet passage, the fuel amount can be set by screwing the fuel adjustment needle valve back by a predetermined amount of rotation, and there is no variation.
Easy to adjust.
【００１９】燃料調整針弁を嵌挿する弁支持孔と燃料調
整針弁との嵌挿部に隙間がないから、燃料がよどんで気
泡が停滞したり、異物が噛み込むなどの恐れがなく、常
に安定した燃料の流れが得られる。[0019] Since there is no gap between the valve support hole into which the fuel adjustment needle valve is inserted and the insertion part between the fuel adjustment needle valve, there is no risk of fuel stagnation, air bubbles becoming stagnant, or foreign objects getting caught. A stable flow of fuel is always obtained.
【図１】本発明に係る燃料調整機構を備えたダイヤフラ
ム型気化器の正面断面図である。FIG. 1 is a front sectional view of a diaphragm type carburetor equipped with a fuel adjustment mechanism according to the present invention.
【図２】同要部を拡大して示す正面断面図である。FIG. 2 is a front sectional view showing an enlarged view of the main part.
【図３】同平面断面図である。FIG. 3 is a cross-sectional view of the same plane.
【図４】従来のダイヤフラム型気化器の正面断面図であ
る。FIG. 4 is a front sectional view of a conventional diaphragm type carburetor.
３０：燃料調整針弁 ３５：定圧燃料室 ３９：燃料ノズル ５３：入口通路 ５４：テーパ孔 ５５：出口通路 ５７：弁支持孔 ５８：先端軸部 ５９：テーパ部 ６０：中間軸部 30: Fuel adjustment needle valve 35: Constant pressure fuel chamber 39: Fuel nozzle 53: Entrance passage 54: Tapered hole 55: Exit passage 57: Valve support hole 58: Tip shaft part 59: Tapered part 60: Intermediate shaft part
Claims (3)
燃料調整針弁を設けたものにおいて、燃料ノズルの基端
部から同軸に延びる出口通路の内周壁に定圧燃料室から
延びる入口通路を開口し、入口通路の開口端部へ、入口
通路と反対側の弁支持孔から出口通路を横切る燃料調整
針弁を突出させたことを特徴とする、ダイヤフラム型気
化器の燃料調整機構。Claim 1: A fuel adjustment needle valve is provided in a fuel passage connecting a constant pressure fuel chamber and a fuel nozzle, wherein an inlet passage extending from the constant pressure fuel chamber is provided on an inner circumferential wall of an outlet passage coaxially extending from a base end of the fuel nozzle. A fuel adjustment mechanism for a diaphragm type carburetor, characterized in that a fuel adjustment needle valve is opened and protrudes from a valve support hole on the opposite side of the inlet passage to the open end of the inlet passage and crosses the outlet passage.
し、燃料調整針弁のテーパ部を前記出口通路を横切り入
口通路のテーパ孔へ当接可能に突出した、請求項１に記
載のダイヤフラム型気化器の燃料調整機構。2. A tapered hole is formed at an open end of the inlet passage, and a tapered portion of the fuel adjustment needle valve protrudes across the outlet passage so as to be able to come into contact with the tapered hole of the inlet passage. diaphragm type carburetor fuel adjustment mechanism.
に、燃料調整針弁の中間軸部を移動調節可能にかつ隙間
なく嵌挿した、請求項１に記載のダイヤフラム型気化器
の燃料調整機構。3. The diaphragm type carburetor according to claim 1, wherein the intermediate shaft portion of the fuel adjustment needle valve is fitted into the valve support hole opening to the inner circumferential wall of the outlet passage so as to be movably adjustable and without any gap. Fuel adjustment mechanism.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2288891A JPH04339161A (en) | 1991-01-23 | 1991-01-23 | Fuel adjusting mechanism of diaphragm type carburetor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2288891A JPH04339161A (en) | 1991-01-23 | 1991-01-23 | Fuel adjusting mechanism of diaphragm type carburetor |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH04339161A true JPH04339161A (en) | 1992-11-26 |
Family
ID=12095212
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2288891A Pending JPH04339161A (en) | 1991-01-23 | 1991-01-23 | Fuel adjusting mechanism of diaphragm type carburetor |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH04339161A (en) |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6092793A (en) * | 1998-04-30 | 2000-07-25 | Keihin Corporation | Constant vacuum type carburetor |
| EP1045134A2 (en) * | 1999-04-13 | 2000-10-18 | Walbro Japan, Inc. | Carburetor with vapor purge pump |
| EP1087125A2 (en) * | 1999-09-24 | 2001-03-28 | Walbro Japan, Inc. | Carburetor with rotary throttle valve and improved fuel conduit system |
| US6913250B2 (en) * | 2002-07-23 | 2005-07-05 | Andreas Stihl Ag & Co. Kg | Carburetor arrangement |
| US7097162B2 (en) * | 2003-03-26 | 2006-08-29 | Walbro Japan, Inc. | Carburetor with fuel vapor control |
| US7374155B2 (en) * | 2005-01-11 | 2008-05-20 | Walbro Engine Management, L.L.C. | Diaphragm carburetor and method of assembly |
-
1991
- 1991-01-23 JP JP2288891A patent/JPH04339161A/en active Pending
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6092793A (en) * | 1998-04-30 | 2000-07-25 | Keihin Corporation | Constant vacuum type carburetor |
| EP1045134A2 (en) * | 1999-04-13 | 2000-10-18 | Walbro Japan, Inc. | Carburetor with vapor purge pump |
| EP1045134A3 (en) * | 1999-04-13 | 2001-06-27 | Walbro Japan, Inc. | Carburetor with vapor purge pump |
| US6425573B1 (en) | 1999-04-13 | 2002-07-30 | Walbro Japan, Inc. | Carburetor with vapor purge pump |
| EP1087125A2 (en) * | 1999-09-24 | 2001-03-28 | Walbro Japan, Inc. | Carburetor with rotary throttle valve and improved fuel conduit system |
| EP1087125A3 (en) * | 1999-09-24 | 2001-12-05 | Walbro Japan, Inc. | Carburetor with rotary throttle valve and improved fuel conduit system |
| US6913250B2 (en) * | 2002-07-23 | 2005-07-05 | Andreas Stihl Ag & Co. Kg | Carburetor arrangement |
| US7097162B2 (en) * | 2003-03-26 | 2006-08-29 | Walbro Japan, Inc. | Carburetor with fuel vapor control |
| US7374155B2 (en) * | 2005-01-11 | 2008-05-20 | Walbro Engine Management, L.L.C. | Diaphragm carburetor and method of assembly |
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