JPS63285253A - Lubrication oil feed structure for two-cycle engine carburetor - Google Patents
Lubrication oil feed structure for two-cycle engine carburetorInfo
- Publication number
- JPS63285253A JPS63285253A JP12210087A JP12210087A JPS63285253A JP S63285253 A JPS63285253 A JP S63285253A JP 12210087 A JP12210087 A JP 12210087A JP 12210087 A JP12210087 A JP 12210087A JP S63285253 A JPS63285253 A JP S63285253A
- Authority
- JP
- Japan
- Prior art keywords
- piston valve
- lubricating oil
- intake passage
- passage
- cylinder
- 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
- 238000005461 lubrication Methods 0.000 title abstract 6
- 239000010687 lubricating oil Substances 0.000 claims description 65
- 239000003921 oil Substances 0.000 claims description 8
- 239000000446 fuel Substances 0.000 claims description 4
- 230000002093 peripheral effect Effects 0.000 abstract description 8
- 238000011144 upstream manufacturing Methods 0.000 description 10
- 230000001050 lubricating effect Effects 0.000 description 3
- 230000000694 effects Effects 0.000 description 2
- 238000005266 casting Methods 0.000 description 1
- 238000003754 machining Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
- F02B75/00—Other engines
- F02B75/02—Engines characterised by their cycles, e.g. six-stroke
- F02B2075/022—Engines characterised by their cycles, e.g. six-stroke having less than six strokes per cycle
- F02B2075/025—Engines characterised by their cycles, e.g. six-stroke having less than six strokes per cycle two
Abstract
Description
【発明の詳細な説明】
（産業上の利用分野）
本発明はニサイクルエンジンの気化器の潤滑油供給構造
に関し、更に詳細には、吸気と共にクランク室内に供給
する潤滑油を利用して気化器のピストンバルブを潤滑す
るようにしたニサイクルエンジンの気化器の潤滑油供給
構造に関する。DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a lubricating oil supply structure for a carburetor of a two-cycle engine, and more particularly, the present invention relates to a lubricating oil supply structure for a carburetor of a two-cycle engine. This invention relates to a lubricating oil supply structure for a carburetor of a two-cycle engine that lubricates a piston valve.
（従来の技術）
ニサイクルエンジンでは一般に、潤滑油タンクから潤滑
油ポンプによって潤滑油を吸気通路に導き、吸気と共に
潤滑油をクランク室内に供給し、エンジン各部を潤滑す
る方式が採用されている。(Prior Art) Two-cycle engines generally employ a method in which lubricating oil is guided from a lubricating oil tank to an intake passage by a lubricating oil pump, and the lubricating oil is supplied into the crank chamber along with the intake air to lubricate each part of the engine.
そして従来では、吸気通路に潤滑油を導く油路を気化器
とは離間した箇所に開口させている。Conventionally, an oil passage that leads lubricating oil to the intake passage is opened at a location separated from the carburetor.
そのため、吸気通路内に出没して吸気量を調整するピス
トンバルブを備えた気化器では、斯かる油路をピストン
バルブよりも下流の吸気通路箇所に開口させた場合には
油路からの潤滑油によりピストンバルブを潤滑で籾ない
。Therefore, in a carburetor equipped with a piston valve that enters and retracts into the intake passage to adjust the amount of intake air, if the oil passage is opened in the intake passage downstream of the piston valve, lubricating oil from the oil passage This prevents the piston valve from being lubricated.
また、ピストンバルブよりも上流の吸気通路箇所に油路
を開口させた場合には、油路からの潤滑油でピストンバ
ルブを潤滑できるが、この場合には、潤滑油が吸気と共
にピストンバルブに単に衝当するのみであるので、ピス
トンバルブを充分に潤滑できるとは言い難い。Additionally, if an oil passage is opened in the intake passage upstream of the piston valve, the piston valve can be lubricated with the lubricating oil from the oil passage, but in this case, the lubricating oil simply flows into the piston valve along with the intake air. It is difficult to say that the piston valve can be sufficiently lubricated because it only hits the piston.
（発明が解決しようとする問題点）
本発明は前記事情に鑑み案出されたものであって、本発
明の目的は、吸気と共にクランク室内に供給する潤滑油
を利用して気化器のピストンバルブを潤滑でき、更には
エンジンの運転状態に迅速に対応してエンジン側に潤滑
油を供給することができるニサイクルエンジンの気化器
の潤滑油供給構造を提供するにある。(Problems to be Solved by the Invention) The present invention has been devised in view of the above-mentioned circumstances, and an object of the present invention is to utilize the lubricating oil supplied into the crank chamber together with the intake air to control the piston valve of the carburetor. To provide a lubricating oil supply structure for a carburetor of a two-cycle engine, which is capable of lubricating the engine, and furthermore, can supply lubricating oil to the engine side in quick response to the operating condition of the engine.
（問題点を解決するための手段）
前記目的を達成するため本発明の構成は、吸気通路５が
形成されたボディ３と、
ボディ３に形成されたシリンダ１５内を摺動し、吸気通
路５内に出没して吸気量を調整するピストンバルブ１７
と、
吸気通路５の下方に延出し、燃料に浸漬されたニードル
ジェット１９と、
ピストンバルブ１７から垂設され、ニードルジェット１
９内を釉方向動じて燃料の噴出量を調整するジェットニ
ードル３３と、
を備えたニサイクルエンジンの気化器において、
ピストンバルブ１７を習動案内するシリンダ１５の周面
１５Ａに潤滑油路３９を開口４１させ、
ピストンバルブ１７の外周面１７Ａ或いはシリンダ１５
の周面１５Ａの少なくとも一方に、前記間口４１に接続
し該開口４１からの潤滑油を吸気通路５に導く油路４７
を形成した、
ことを特徴とする。(Means for Solving the Problems) In order to achieve the above object, the present invention includes a body 3 in which an intake passage 5 is formed, and a cylinder 15 that slides within the cylinder 15 formed in the body 3, and the intake passage 5 Piston valve 17 that adjusts the amount of intake air by retracting inside
, a needle jet 19 extending below the intake passage 5 and immersed in fuel, and a needle jet 1 extending vertically from the piston valve 17 .
In the carburetor for a two-cycle engine, the lubricating oil passage 39 is provided on the circumferential surface 15A of the cylinder 15 that guides the piston valve 17 by learning. The opening 41 is opened, and the outer circumferential surface 17A of the piston valve 17 or the cylinder 15
An oil passage 47 connected to the opening 41 and guiding lubricating oil from the opening 41 to the intake passage 5 is provided on at least one of the circumferential surface 15A of the opening 41.
It is characterized by having formed.
（作用）
潤滑油路３９から導出された潤滑油は油路４７を通り、
シリンダ周面１５Ａとピストンバルブ外周面１７Ａを潤
滑しつつ吸気通路５に至り、潤滑油は吸気と共にエンジ
ン側に送給される。(Function) The lubricating oil led out from the lubricating oil passage 39 passes through the oil passage 47,
The lubricating oil reaches the intake passage 5 while lubricating the cylinder circumferential surface 15A and the piston valve outer circumferential surface 17A, and is fed to the engine side together with the intake air.
従って、吸気と共にエンジン側に送給される潤滑油を利
用してピストンバルブ１７を潤滑することができる。Therefore, the piston valve 17 can be lubricated using the lubricating oil that is fed to the engine side together with the intake air.
また、吸気通路５の流路面積はピストンバルブ１７によ
り絞られ、ピストンバルブ１７が配設される吸気通路部
分５Ａにはエンジン側の負圧が最も大きく作用し、この
負圧が潤滑油に作用するので、エンジンの運転状態に迅
速に対応してエンジン側に潤滑油を供給することが可能
となる。Further, the flow area of the intake passage 5 is narrowed by the piston valve 17, and the negative pressure from the engine side acts most heavily on the intake passage portion 5A where the piston valve 17 is disposed, and this negative pressure acts on the lubricating oil. Therefore, it becomes possible to supply lubricating oil to the engine side in response to the operating state of the engine quickly.
（実施例） 以下、本発明の実施例を添付図面に従って説明する。(Example) Embodiments of the present invention will be described below with reference to the accompanying drawings.
まず第１実施例について説明すると、第１図は第１実施
例に係る気化器の要部断面側面図、第２図は同・要部断
面平面図、第３図は第２図のｍ −ＩＨ線断面図、第４
図は吸気通路の中間部部分の断面図を示す。First, to explain the first embodiment, FIG. 1 is a cross-sectional side view of the main part of the carburetor according to the first embodiment, FIG. 2 is a cross-sectional plan view of the main part, and FIG. 3 is a m- IH line sectional view, 4th
The figure shows a cross-sectional view of the middle portion of the intake passage.
１は気化器、３はそのボディ〆で、ボディ３には左右方
向に延出する吸気通路５を形成し、ボディ３の下部には
フロート室７が画成されたケース９を取着する。Reference numeral 1 denotes a carburetor, 3 a body end thereof, an intake passage 5 extending in the left-right direction is formed in the body 3, and a case 9 in which a float chamber 7 is defined is attached to the lower part of the body 3.
前記吸気通路５の中間部５Ａは上下に縦長の楕円状を呈
し、吸気通路５の−ｆｉ７４５Ｂはエアクリーナ側に、
他端５Ｃはエンジン側に連結する。The intermediate portion 5A of the intake passage 5 has a vertically elongated elliptical shape, and -fi745B of the intake passage 5 is on the air cleaner side.
The other end 5C is connected to the engine side.
中間部５Ａを画成するボディ３部分の上下には夫々筒部
１１，１３を膨出形成し、中間部５Ａの下面と上側の筒
部１１内にわたってシリンダ１５を形成し、シリンダ１
５には摺動自在にピストンバルブ１７を嵌装する。Cylindrical portions 11 and 13 are formed in the upper and lower portions of the body 3 that define the intermediate portion 5A, respectively, and a cylinder 15 is formed across the lower surface of the intermediate portion 5A and within the upper portion of the cylindrical portion 11.
5 is slidably fitted with a piston valve 17.
また、下側の筒部１３内にはニードルジェット１９を組
み込む。Further, a needle jet 19 is incorporated into the lower cylindrical portion 13.
ニードルジェット１９は軸心をシリンダ１５の軸心に合
致させて配設し、ニードルジェット１９はフロート室７
の燃料に浸漬させ、ニードルジェット１９の下方にはメ
インジェット２１を組み込み、図中２３はフロート、２
５はメインエアジェツト、２７はバイパス路である。The needle jet 19 is arranged so that its axis coincides with the axis of the cylinder 15, and the needle jet 19 is arranged so that its axis coincides with the axis of the cylinder 15.
A main jet 21 is installed below the needle jet 19, and 23 in the figure is a float;
5 is a main air jet, and 27 is a bypass path.
ピストンバルブ１７の下部にはスカート部２９を形成し
、スカート部２９の前面には切欠き３１を形成する。A skirt portion 29 is formed in the lower part of the piston valve 17, and a notch 31 is formed in the front surface of the skirt portion 29.
ピストンバルブ１７の下部からはシリンダ１５の軸心に
軸心を合致させてジェットニードル３３を垂設し、ジェ
ットニードル３３はニードルジェット１９に装入する。A jet needle 33 is vertically installed from the lower part of the piston valve 17 with its axis aligned with the axis of the cylinder 15, and the jet needle 33 is inserted into the needle jet 19.
ピストンバルブ１７にはスロットルグリップに接続する
ワイヤ３５を連結し、ピストンバルブ１７はスプリング
３７により吸気通路５を閉塞する方向に付勢する。ピス
トンバルブ１７の下限位置は不図示のスットブスクリュ
ーで規制される。A wire 35 connected to a throttle grip is connected to the piston valve 17, and the piston valve 17 is biased by a spring 37 in a direction to close the intake passage 5. The lower limit position of the piston valve 17 is regulated by a stop screw (not shown).
そしてスロットルグリップの操作によりピストンバルブ
１７を上下動させ、吸気通路５内でピストンバルブ１７
を出没させ、中間部５Ａの流路面積を増減させて吸気量
を調整すると共に、ジェットニードル３３をニードルジ
ェット１９内で上下動させて燃料の吸気通路５への噴出
量を調整する。Then, by operating the throttle grip, the piston valve 17 is moved up and down, and the piston valve 17 is moved up and down within the intake passage 5.
The jet needle 33 is moved up and down within the needle jet 19 to adjust the amount of fuel jetted into the intake passage 5.
３９は潤滑油路で、潤滑油路３９はボディ３の上側の筒
部１１で第２図に示すようにエンジン側に傾斜させて形
成し、潤滑油路３９はピストンバルブ１７の下限位置で
、即ちピストンバルブ１７の全閉位置でピストンバルブ
１７の上部外周面に臨むようにシリンダ１５の周面に開
口４１させる。39 is a lubricating oil passage, and the lubricating oil passage 39 is formed in the upper cylindrical portion 11 of the body 3 so as to be inclined toward the engine side as shown in FIG. That is, an opening 41 is formed in the circumferential surface of the cylinder 15 so as to face the upper outer circumferential surface of the piston valve 17 when the piston valve 17 is in the fully closed position.
潤滑油路３９にはバイブ４３を連結し、潤滑油タンク内
の潤滑油を潤滑油ポンプによりパイプ４３を介して潤滑
油路３９に供給する。A vibrator 43 is connected to the lubricating oil passage 39, and lubricating oil in the lubricating oil tank is supplied to the lubricating oil passage 39 via the pipe 43 by a lubricating oil pump.
シリンダ１５の周面には上端が前記間口４１に接続し、
実施例では筒部ＩＩ上端から下方に延出して下端４７
Ａが中間部５Ａの側面４５に臨んだ縦溝４７を形成する
。The upper end of the circumferential surface of the cylinder 15 is connected to the opening 41,
In the embodiment, a lower end 47 extends downward from the upper end of the cylindrical portion II.
A forms a vertical groove 47 facing the side surface 45 of the intermediate portion 5A.
前記縦溝４７は第４図に示すように、ピストンバルブ１
７が中間部５Ａの流路面積を少なくとも３０％開放した
状態で、下端４７Ａが流路内に露出するように形成する
。The vertical groove 47 is formed in the piston valve 1 as shown in FIG.
7 is formed such that the lower end 47A is exposed in the flow path with at least 30% of the flow path area of the intermediate portion 5A open.
本実施例は前記のように構成したので、潤滑油路３９、
開口４１から導出された潤滑油は縦溝４７を通り、シリ
ンダ周面１５Ａとピストンバルブ外周面１７Ａを潤滑し
つつ中間部５Ａ側に至り、潤滑油は吸気と共にエンジじ
側に送給される。Since this embodiment is configured as described above, the lubricating oil passage 39,
The lubricating oil led out from the opening 41 passes through the vertical groove 47 and reaches the intermediate portion 5A side while lubricating the cylinder circumferential surface 15A and the piston valve outer circumferential surface 17A, and the lubricating oil is fed to the engine side along with the intake air.
従って、吸気と共にエンジン側に送給される潤滑油を利
用してピストンバルブ１７を潤滑することができる。Therefore, the piston valve 17 can be lubricated using the lubricating oil that is fed to the engine side together with the intake air.
また、エンジン側の負圧が最も大きく作用するピストン
バルブ１７部分に縦溝４フが開口しているので、エンジ
ンの運転状態に迅速に対応してエンジン側に潤滑油を供
給することが可能となる。In addition, since the vertical groove 4 is opened in the piston valve 17 portion where the negative pressure on the engine side acts the most, it is possible to quickly respond to the engine operating condition and supply lubricating oil to the engine side. Become.
また、縦溝４７はボディ鋳造時に一体に成形できるので
、加工工数の増加を抑制しつつピストンバルブ１７を潤
滑できる。Moreover, since the vertical groove 47 can be integrally molded during body casting, the piston valve 17 can be lubricated while suppressing an increase in the number of machining steps.
次に第５図乃至第７図を参照して本発明の第２実施例に
ついて説明する。Next, a second embodiment of the present invention will be described with reference to FIGS. 5 to 7.
第５図は第２実施例に係る気化器の要部断面側面図、第
６図は吸気通路の中間部部分の断面図、第７図は吸気通
路の下流側部分の断面図を示す。FIG. 5 is a cross-sectional side view of a main part of the carburetor according to the second embodiment, FIG. 6 is a cross-sectional view of the intermediate portion of the intake passage, and FIG. 7 is a cross-sectional view of the downstream portion of the intake passage.
第２実施例では前記第１実施例に加えて、吸気通路５の
側面４５から上面４９にわたり、前記縦溝４７の下端４
７Ａに接続し吸気通路５の延出方向に沿って下流側に延
出する横溝５１を形成している。In the second embodiment, in addition to the first embodiment, the lower end 4 of the vertical groove 47 extends from the side surface 45 to the upper surface 49 of the intake passage 5.
7A, a lateral groove 51 is formed that extends downstream along the extending direction of the intake passage 5.
第２実施例では縦溝４７の下端４７Ａを中間部５Ａの側
面４５上部に臨ませて形成する。そして横溝５１を、縦
溝４７の下端４７Ａに接続し上下幅を小さく形成した上
流端５１Ａと、上流端５１Ａから上下幅を漸増させて延
出する上流部５１Ｂと、上流部５１Ｂから延出し上下幅
が一定の下流部５１Ｃとで構成している。In the second embodiment, the lower end 47A of the vertical groove 47 is formed so as to face the upper side surface 45 of the intermediate portion 5A. The horizontal groove 51 is connected to the lower end 47A of the vertical groove 47 to form an upstream end 51A with a small vertical width, an upstream part 51B extending from the upstream end 51A with a gradually increasing vertical width, and an upstream part 51B extending from the upstream part 51B and having a small vertical width. The downstream portion 51C has a constant width.
第２実施例によれば、前記第１実施例による作用効果に
加えて、横溝５１によりエンジン側の負圧とほぼ同圧の
負圧を潤滑油に作用させることができるので、エンジン
側への潤滑油供給をエンジンの運転状態に一層迅速に対
応させて行うことができる。According to the second embodiment, in addition to the effects of the first embodiment, the lateral grooves 51 can cause a negative pressure that is almost the same as the negative pressure on the engine side to act on the lubricating oil. The lubricating oil supply can be made more quickly in response to the operating state of the engine.
また、第２実施例ではシリンダ１５から下流側に延出す
る横溝５１を形成したので、潤滑油がバイパス路２７等
からフロート室７内に侵入する虞もない。Further, in the second embodiment, since the horizontal groove 51 extending downstream from the cylinder 15 is formed, there is no possibility that lubricating oil will enter the float chamber 7 from the bypass path 27 or the like.
次に第８図乃至第１０図を参照して本発明の第３実施例
について説明する。Next, a third embodiment of the present invention will be described with reference to FIGS. 8 to 10.
第８図は第３実施例に係る気化器の要部断面側面図、第
９図は同・要部断面平面図、第１０図は第９図のｘ−Ｘ
線断面図を示す。FIG. 8 is a cross-sectional side view of the main part of the carburetor according to the third embodiment, FIG. 9 is a cross-sectional plan view of the same main part, and FIG.
A line cross-sectional view is shown.
第１０図において６１はピストンバルブ１７の下限位置
を規制するストップスクリュー、６３はピストンバルブ
１７の下端に形成されストップスクリュー６１が当接す
る切欠きで、ストップスクリュー６１は吸気通路５延出
方向と直交する方向に配設されている。In FIG. 10, 61 is a stop screw that regulates the lower limit position of the piston valve 17, 63 is a notch that is formed at the lower end of the piston valve 17 and comes into contact with the stop screw 61, and the stop screw 61 is perpendicular to the direction in which the intake passage 5 extends. It is placed in the direction of
第３実施例では潤滑油路３９をストップスクリュー６１
側で、吸気通路５延出方向と直交する方向に形成してい
る。In the third embodiment, the lubricating oil passage 39 is connected to the stop screw 61.
The intake passage 5 is formed on the side in a direction perpendicular to the direction in which the intake passage 5 extends.
そして、この潤滑油路３９の開口４１に接続させて縦溝
３４７を下方に延出し、縦溝３４７の下端３４７Ａを、
ピストンバルブ１７の下限位置において前記切欠き６３
の上部に臨むように形成している。Then, the vertical groove 347 is connected to the opening 41 of the lubricating oil passage 39 and extends downward, and the lower end 347A of the vertical groove 347 is connected to the opening 41 of the lubricating oil passage 39.
The notch 63 is located at the lower limit position of the piston valve 17.
It is formed so that it faces the top of the.
第３実施例によれば、吸気と共にエンジン側に送給され
る潤滑油を利用してピストンバルブ１７を潤滑すること
ができる他に、吸気の流れ方向とは直交する方向から潤
滑油が供給されるので、ピストンバルブ１７の外周面１
７Ａに均一に潤滑油を付着でき、ピストンバルブ１７の
潤滑を効率的に行うことができる。According to the third embodiment, in addition to being able to lubricate the piston valve 17 using the lubricating oil that is supplied to the engine side together with the intake air, the lubricating oil is also supplied from a direction perpendicular to the flow direction of the intake air. Therefore, the outer peripheral surface 1 of the piston valve 17
The lubricating oil can be applied uniformly to 7A, and the piston valve 17 can be efficiently lubricated.
更に、ピストンバルブ１７の全閉から全開にわたり常に
エンジン側の負圧とほぼ同圧の負圧を潤滑油に作用させ
ることができるので、エンジン側への潤滑油供給をアイ
ドリンク時から高速回転時にわたり行うことができる。Furthermore, since it is possible to apply a negative pressure that is almost the same as the negative pressure on the engine side to the lubricating oil at all times when the piston valve 17 is fully closed to fully open, the lubricating oil supply to the engine side can be changed from idling to high speed rotation. It can be done over a period of time.
次に第１１図及び第１２図を参照して本発明の第４実施
例について説明する。Next, a fourth embodiment of the present invention will be described with reference to FIGS. 11 and 12.
第１１図は第４実施例に係る気化器の概略側面図、第１
２図は第１１図の■矢視図を示す。FIG. 11 is a schematic side view of the carburetor according to the fourth embodiment;
FIG. 2 shows a view in the direction of the ■ arrow in FIG. 11.
第４実施例では前記第３実施例と同様に潤滑油路３９を
吸気通路５延出方向と直交する方向に形成し、この潤滑
油路３９の開口４１に接続し潤滑油を吸気通路５側に導
く縦溝４４７をピストンバルブ１７の外周面１７Ａに形
成している。In the fourth embodiment, similarly to the third embodiment, a lubricating oil passage 39 is formed in a direction perpendicular to the extending direction of the intake passage 5, and is connected to the opening 41 of this lubricating oil passage 39 to supply lubricating oil to the intake passage 5 side. A vertical groove 447 is formed on the outer circumferential surface 17A of the piston valve 17.
前記縦溝４４７の上端４４７Ｂはピストンバルブ外周面
１７Ａにおける吸気通路５延出方向と直交する箇所に位
置し、下端４４７Ａはピストンバルブ外周面１７Ａにお
ける吸気通路５下流側の箇所に位置しζ上端４４７Ｂと
下端４４７Ａ間は湾曲部４４７Ｃで接続されている。The upper end 447B of the vertical groove 447 is located at a location perpendicular to the extending direction of the intake passage 5 on the piston valve outer peripheral surface 17A, and the lower end 447A is located at a location on the downstream side of the intake passage 5 on the piston valve outer peripheral surface 17A. and the lower end 447A are connected by a curved portion 447C.
前記下端４４７Ａの高さはピストンバルブ１７の開度や
エンジン側の負圧に応じて適宜選定する。The height of the lower end 447A is appropriately selected depending on the opening degree of the piston valve 17 and the negative pressure on the engine side.
第４実施例によれば、吸気と共にエンジン側に送給され
る潤滑油を利用してピストンバルブ１７を潤滑すること
ができる他に、縦溝４４７を湾曲させて形成したので、
ピストンバルブ１７とシリンダ１５間の広範囲にわたり
効率良く潤滑油を供給できる。According to the fourth embodiment, in addition to being able to lubricate the piston valve 17 using the lubricating oil sent to the engine side together with the intake air, the vertical groove 447 is formed in a curved manner.
Lubricating oil can be efficiently supplied over a wide range between the piston valve 17 and the cylinder 15.
次に第１３図及び第１４図を参照して本発明の第５実施
例について説明する。Next, a fifth embodiment of the present invention will be described with reference to FIGS. 13 and 14.
第１３図は第５実施例に係る気化器１の要部断面側面図
、第１４図は同・要部断面平面図を示す。FIG. 13 shows a sectional side view of the main part of the carburetor 1 according to the fifth embodiment, and FIG. 14 shows a sectional plan view of the main part.
第５実施例では前記第３実施例と同様に潤滑油路３９を
吸気通路５延出方向と直交する方向に形成し、この潤滑
油路３９の開口４１に接続し潤滑油を吸気通路５側に導
く縦溝５４７をシリンダ周面１５Ａに形成し、且つ、第
２実施例と同様にこの縦溝５４７に接続させて横溝５５
１を形成している。In the fifth embodiment, similarly to the third embodiment, a lubricating oil passage 39 is formed in a direction perpendicular to the extending direction of the intake passage 5, and is connected to the opening 41 of this lubricating oil passage 39 to supply lubricating oil to the intake passage 5 side. A vertical groove 547 is formed on the cylinder circumferential surface 15A, and the horizontal groove 55 is connected to the vertical groove 547 as in the second embodiment.
1 is formed.
前記縦溝５４７は吸気通路５の下流側に湾曲させつつ下
方に延出させる。The vertical groove 547 is curved toward the downstream side of the intake passage 5 and extends downward.
前記縦溝５４７の下端５４７Ａはピストンバルブ１７が
３０％以下の開度で流路内に露出する高さで形成する。The lower end 547A of the vertical groove 547 is formed at a height such that the piston valve 17 is exposed in the flow path with an opening degree of 30% or less.
前記横溝５５１は第２実施例と同様に、縦溝５４７の下
端５４７Ａに接続し上下幅を小さく形成した上流端５５
１Ａと、上流端５５１Ａから上下幅を漸増させて延出す
る上流部５５１Ｂと、上流部５５１Ｂから延出し上下幅
が一定の下流部５５１Ｃとで構成する。As in the second embodiment, the horizontal groove 551 is connected to the lower end 547A of the vertical groove 547 and has an upstream end 55 formed with a small vertical width.
1A, an upstream portion 551B extending from the upstream end 551A with a gradually increasing vertical width, and a downstream portion 551C extending from the upstream portion 551B and having a constant vertical width.
第５実施例によれば、吸気と共にエンジン側に送給され
る潤滑油を利用してピストンバルブ１７を潤滑すること
ができる他に、縦溝５４７を湾曲させて形成したので、
ピストンバルブ１７とシリシダ１５間の広範囲にわたり
効率良く潤滑油を供給できる。According to the fifth embodiment, in addition to being able to lubricate the piston valve 17 using the lubricating oil sent to the engine side together with the intake air, the vertical groove 547 is formed in a curved manner.
Lubricating oil can be efficiently supplied over a wide range between the piston valve 17 and the cylinder 15.
また、横溝５５１によりエンジン側の負圧とほぼ同圧の
負圧を潤滑油に作用させ、エンジン側への潤滑油供給を
エンジンの運転状態に迅速に対応させて行うことができ
る。In addition, the lateral groove 551 causes a negative pressure that is approximately the same as the negative pressure on the engine side to act on the lubricating oil, so that the lubricating oil can be supplied to the engine side in a manner that quickly corresponds to the operating state of the engine.
また、横溝５５１を形成したので、潤滑油がバイパス路
２７等からフロート室７内に侵入する虞もない。Furthermore, since the lateral groove 551 is formed, there is no possibility that lubricating oil will enter the float chamber 7 from the bypass path 27 or the like.
（発明の効果）
以上の説、明で明らかなように、本発明によれば、吸気
と共にクランク室内に供給する潤滑油を利用して気化器
のピストンバルブを潤滑でき、更にはエンジンの運転状
態に迅速に対応してエンジン側に潤滑油を供給すること
ができるニサイクルエンジンの気化器の潤滑油供給構造
を得ることができる。(Effects of the Invention) As is clear from the above explanation and description, according to the present invention, the piston valve of the carburetor can be lubricated using the lubricating oil supplied into the crank chamber together with the intake air, and furthermore, the engine operating condition It is possible to obtain a lubricating oil supply structure for a carburetor of a two-cycle engine that can quickly respond to the situation and supply lubricating oil to the engine side.
第１図は第１実施例に係る気化器の要部断面側面図、第
２１図は同・要部断面平面図、第３図は第２図のＩＩＩ
−ＩＩＩ線断面図、第４図は吸気通路の中間部部分の
断面図、第５図は第２実施例に係る気化器の要部断面側
面図、第６図は吸気通路の中間部部分の断面図、第７図
は吸気通路の下流側部分の断面図、第８図は第３実施例
に係る気化器の要部断面側面図、第９図は同・要部断面
平面図、第１０図は第９図のＸ−Ｘ線断面図、第１１図
は第３実ｊＩ例に係る気化器の概略側面図、第１２図は
第１１図の店矢視図、第１３図は第５実施例に係る気化
器の要部断面側面図、第１４図は同・要部断面平面図で
ある。
尚図中、１は気化器、３はボディ、５は吸気通路、１５
はシリンダ、１７はピストンバルブ、３３はジェットニ
ードル、３９は潤滑油路、４７．３４７，４４７，５４
７はｆ従溝、５１゜５５１は横溝である。
第３図
第１２図
第９図
ＬＸ
第１４図FIG. 1 is a cross-sectional side view of the main part of the carburetor according to the first embodiment, FIG. 21 is a cross-sectional plan view of the main part, and FIG. 3 is the III of FIG.
-III line sectional view, Figure 4 is a sectional view of the middle part of the intake passage, Figure 5 is a sectional side view of the main part of the carburetor according to the second embodiment, and Figure 6 is the middle part of the intake passage. 7 is a sectional view of the downstream part of the intake passage, FIG. 8 is a sectional side view of the main part of the carburetor according to the third embodiment, FIG. 9 is a sectional plan view of the main part of the same, and FIG. The figure is a cross-sectional view taken along the line X-X of FIG. 9, FIG. 11 is a schematic side view of the carburetor according to the third example, FIG. 12 is a view taken from the shop arrow in FIG. 11, and FIG. FIG. 14 is a cross-sectional side view of the main part of the carburetor according to the embodiment, and FIG. 14 is a cross-sectional plan view of the main part. In the figure, 1 is the carburetor, 3 is the body, 5 is the intake passage, 15
is a cylinder, 17 is a piston valve, 33 is a jet needle, 39 is a lubricating oil path, 47.347, 447, 54
7 is an f subordinate groove, and 51°551 is a lateral groove. Figure 3 Figure 12 Figure 9 LX Figure 14
Claims (1)
出没して吸気量を調整するピストンバルブと、 吸気通路の下方に延出し、燃料に浸漬されたニードルジ
ェットと、 ピストンバルブから垂設され、ニードルジェット内を軸
方向動して燃料の噴出量を調整するジェットニードルと
、 を備えたニサイクルエンジンの気化器において、 ピストンバルブを習動案内するシリンダの周面に潤滑油
路を開口させ、 ピストンバルブの外周面或いはシリンダの周面の少なく
とも一方に、前記開口に接続し該開口からの潤滑油を吸
気通路に導く油路を形成した、ことを特徴とするニサイ
クルエンジンの気化器の潤滑油供給構造。[Scope of Claims] A body in which an intake passage is formed; a piston valve that slides in a cylinder formed in the body and moves in and out of the intake passage to adjust the amount of intake air; and a piston valve that extends below the intake passage. , a needle jet immersed in fuel, and a jet needle that is vertically disposed from the piston valve and moves in an axial direction within the needle jet to adjust the amount of fuel ejected. A lubricating oil passage is opened on the circumferential surface of the cylinder that guides the piston, and an oil passage is connected to the opening and leads the lubricating oil from the opening to the intake passage on at least one of the outer circumferential surface of the piston valve or the circumferential surface of the cylinder. A lubricating oil supply structure for a carburetor of a two-cycle engine, characterized by the following.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP62122100A JP2674690B2 (en) | 1987-05-19 | 1987-05-19 | Lubricating oil supply structure for carburetor of two-cycle engine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP62122100A JP2674690B2 (en) | 1987-05-19 | 1987-05-19 | Lubricating oil supply structure for carburetor of two-cycle engine |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS63285253A true JPS63285253A (en) | 1988-11-22 |
| JP2674690B2 JP2674690B2 (en) | 1997-11-12 |
Family
ID=14827645
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP62122100A Expired - Fee Related JP2674690B2 (en) | 1987-05-19 | 1987-05-19 | Lubricating oil supply structure for carburetor of two-cycle engine |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2674690B2 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2009293402A (en) * | 2008-06-02 | 2009-12-17 | Mikuni Corp | Carburetor |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6021493U (en) * | 1983-07-19 | 1985-02-14 | 谷川商事株式会社 | cloth storage case |
-
1987
- 1987-05-19 JP JP62122100A patent/JP2674690B2/en not_active Expired - Fee Related
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6021493U (en) * | 1983-07-19 | 1985-02-14 | 谷川商事株式会社 | cloth storage case |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2009293402A (en) * | 2008-06-02 | 2009-12-17 | Mikuni Corp | Carburetor |
Also Published As
| Publication number | Publication date |
|---|---|
| JP2674690B2 (en) | 1997-11-12 |
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