JPH0942061A - Sliding throttle valve type carburetor - Google Patents
Sliding throttle valve type carburetorInfo
- Publication number
- JPH0942061A JPH0942061A JP21806195A JP21806195A JPH0942061A JP H0942061 A JPH0942061 A JP H0942061A JP 21806195 A JP21806195 A JP 21806195A JP 21806195 A JP21806195 A JP 21806195A JP H0942061 A JPH0942061 A JP H0942061A
- Authority
- JP
- Japan
- Prior art keywords
- throttle valve
- sliding throttle
- intake passage
- engine
- air
- 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
Landscapes
- Control Of Throttle Valves Provided In The Intake System Or In The Exhaust System (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は、気化器本体を貫通する
吸気路に連設された絞り弁案内筒内に移動自在に配置さ
れた摺動絞り弁によって、吸気路が開閉制御される摺動
絞り弁型気化器に関する。そして、このうち特に摺動絞
り弁を全閉状態に保持し、摺動絞り弁を迂回して形成さ
れるバイパス空気通路を介して最低空気量を機関に向け
て供給した摺動絞り弁型気化器に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sliding valve whose opening and closing are controlled by a sliding throttle valve which is movably arranged in a throttle valve guide cylinder which is connected to an intake passage passing through a carburetor main body. The present invention relates to a dynamic throttle valve type carburetor. Of these, especially the sliding throttle valve is held in a fully closed state, and the minimum amount of air is supplied to the engine via a bypass air passage formed by bypassing the sliding throttle valve, and the sliding throttle valve type vaporization is performed. Regarding vessels.
【０００２】[0002]
【従来の技術】従来の摺動絞り弁型気化器は図５、図６
に示される。図５はその縦断面図、図６は図５の左側の
側面図である。１は内部を側方に吸気路２が貫通した気
化器本体であって、吸気路２の中間部から上方に向かっ
て摺動絞り弁案内筒３が連設されて開口する。この摺動
絞り弁案内筒３の下方底部３Ａは、吸気路２の下方底部
２Ａより更に下方に向かって没入して形成される。従っ
て、吸気路２の下方底部２Ａと摺動絞り弁案内筒３の下
方底部３Ａとの間には段部４が形成される。５は気化器
本体１の下方に配置された浮子室本体であって、気化器
本体１と浮子室本体５とによって内部に一定なる燃料液
面が形成される浮子室６が形成される。７は主燃料系Ｍ
によって形成される主混合気を吸気路２内に供給するニ
ードルジエットであり、この主混合気を形成する主燃料
は主燃料ジエット８によって制御され、主空気は主空気
ジエット９によって制御される。Ｓは低速燃料ジエット
１０によって制御される低速燃料と、図示せぬ低速空気
ジエットによって制御される低速空気とにより形成され
る低速燃料系であり、この低速燃料系Ｓによって形成さ
れる低速混合気はバイパス孔１１及びパイロットアウト
レット孔１２より吸気路２内へ供給される。このバイパ
ス孔１１はニードルジエット７より機関側（図５におい
て左方）の摺動絞り弁案内筒３の下方底部３Ａに開口す
る。パイロットアウトレット孔１２はバイパス孔１１よ
り更に機関側の吸気路２の下方底部２Ａに開口する。１
３は摺動絞り弁案内筒３内に移動自在に配置されて、吸
気路２を全閉から全開に渡って開閉制御する摺動絞り弁
であり、吸気路２の全閉状態は、摺動絞り弁１３の機関
側対向側面１３Ａの下端１３Ｂが摺動絞り弁案内筒３の
下方底部３Ａに当接した状態で得ることができる。この
状態で機関側対向側面１３Ａの下端１３Ｂ近傍は段部４
に接触する。尚、図５において、摺動絞り弁１３の機関
側対向側面１３Ａの下端１３Ｂは、説明を容易にする為
に摺動絞り弁案内筒３の下方底部３Ａよりわずかに上方
に図示した。又、１４は摺動絞り弁１３に一体的に取着
されたジエットニードルであって、吸気路２（摺動絞り
弁案内筒３の下方底部３Ａに相当する）に開口するニー
ドルジエット７内に挿入される。以上によると、吸気路
２は摺動絞り弁１３によって図示せぬエアクリーナに連
なるエアクリーナ側の吸気路２Ｂ（図５において右方の
吸気路）と図示せぬ機関に連なる機関側の吸気路２Ｃ
（図５において左方の吸気路）とに区分される。そし
て、エアクリーナ側の吸気路２Ｂと機関側の吸気路２Ｃ
とは摺動絞り弁１３を迂回してバイパス空気通路１５に
て連絡される。尚、バイパス空気通路１５には、該空気
通路１５を通過する空気量を調整する調整手段１６が配
置される。このバイパス通路１５及び調整手段１６は例
えば特公平２−２５０２２号公報で知られる。又、前述
したバイパス孔１１は摺動絞り弁１３の機関側対向側面
１３Ａの上流側吸気路２Ｄ（いいかえると機関側対向側
面１３Ａとニードルジエット７との間の吸気路）に開口
し、パイロットアウトレット孔１２は摺動絞り弁１３の
機関側対向側面１３Ａより下流側の吸気路２Ｅ（いいか
えると機関側対向側面１３Ａより機関側の吸気路２Ｃ）
に開口する。2. Description of the Related Art A conventional sliding throttle valve type carburetor is shown in FIGS.
Is shown in 5 is a vertical sectional view thereof, and FIG. 6 is a side view on the left side of FIG. Reference numeral 1 denotes a carburetor main body having an intake passage 2 penetrating laterally inside thereof, and a sliding throttle valve guide cylinder 3 is continuously provided and opens upward from an intermediate portion of the intake passage 2. The lower bottom portion 3A of the sliding throttle valve guide cylinder 3 is formed so as to be recessed further downward than the lower bottom portion 2A of the intake passage 2. Therefore, the step portion 4 is formed between the lower bottom portion 2A of the intake passage 2 and the lower bottom portion 3A of the sliding throttle valve guide cylinder 3. Reference numeral 5 denotes a float chamber main body disposed below the vaporizer main body 1, and a float chamber 6 in which a constant fuel liquid surface is formed is formed by the vaporizer main body 1 and the float chamber main body 5. 7 is the main fuel system M
Is a needle jet for supplying the main air-fuel mixture formed in the intake passage 2 with the main fuel forming the main air-fuel mixture being controlled by the main fuel jet 8 and the main air being controlled by the main air jet 9. S is a low speed fuel system formed by low speed fuel controlled by the low speed fuel jet 10 and low speed air controlled by a low speed air jet (not shown). It is supplied into the intake passage 2 through the bypass hole 11 and the pilot outlet hole 12. The bypass hole 11 opens in the lower bottom portion 3A of the sliding throttle valve guide cylinder 3 on the engine side (left side in FIG. 5) of the needle jet 7. The pilot outlet hole 12 opens to the lower bottom portion 2A of the intake passage 2 further on the engine side than the bypass hole 11. 1
A sliding throttle valve 3 is movably arranged in the sliding throttle valve guide cylinder 3 and controls opening and closing of the intake passage 2 from fully closed to fully open. It can be obtained in a state where the lower end 13B of the engine side facing side surface 13A of the throttle valve 13 is in contact with the lower bottom portion 3A of the sliding throttle valve guide cylinder 3. In this state, the stepped portion 4 is formed near the lower end 13B of the engine side facing side surface 13A.
To contact. In FIG. 5, the lower end 13B of the engine-side facing side surface 13A of the sliding throttle valve 13 is shown slightly above the lower bottom portion 3A of the sliding throttle valve guide cylinder 3 for ease of explanation. Further, 14 is a jet needle integrally attached to the sliding throttle valve 13, and is inside a needle jet 7 opening to the intake passage 2 (corresponding to the lower bottom portion 3A of the sliding throttle valve guide cylinder 3). Is inserted. According to the above, the intake passage 2 is connected to the air cleaner (not shown) by the sliding throttle valve 13 and the intake passage 2B on the air cleaner side (the intake passage on the right side in FIG. 5) and the intake passage 2C on the engine side that is connected to the engine (not shown).
(Intake path on the left side in FIG. 5). The intake passage 2B on the air cleaner side and the intake passage 2C on the engine side
Are communicated with each other through a bypass air passage 15 by bypassing the sliding throttle valve 13. The bypass air passage 15 is provided with adjusting means 16 for adjusting the amount of air passing through the air passage 15. The bypass passage 15 and the adjusting means 16 are known, for example, from Japanese Patent Publication No. 2-25022. Further, the bypass hole 11 described above is opened in the upstream intake passage 2D of the engine side facing side surface 13A of the sliding throttle valve 13 (in other words, the intake path between the engine side facing side surface 13A and the needle jet 7), and the pilot outlet The hole 12 is an intake passage 2E on the downstream side of the engine-side facing side surface 13A of the sliding throttle valve 13 (in other words, an engine-side intake passage 2C on the engine side facing side surface 13A).
Open to
【０００３】[0003]
【発明が解決しようとする課題】摺動絞り弁１３の最低
開度時における機関の運転は以下の如く行なわれる。摺
動絞り弁１３は、スプリング１７によってもっとも下方
に戻された状態にあって、摺動絞り弁１３の機関側対向
側面１３Ａの下端１３Ｂは吸気路２の下方底部２Ａより
更に下方へ進入し、摺動絞り弁案内筒３の下方底部３Ａ
に当接した状態にある。（図５、図６では説明を容易に
する為に当接させていない）この状態において、摺動絞
り弁１３の機関側対向側面１３Ａの下端１３Ｂ近傍は、
段部４に臨んで接触して配置されて、吸気路２を全閉状
態に保持する。従って摺動絞り弁１３を介してエアクリ
ーナ側の吸気路２Ｂから機関側の吸気路２Ｃに向けて空
気が流れることはない。摺動絞り弁１３は吸気路２を全
閉保持する。一方、バイパス空気通路１５は調整手段１
６によってその通過空気量が制御され、このバイパス空
気通路１５が摺動絞り弁１３を迂回してエアクリーナ側
の吸気路２Ｂと機関側の吸気路２Ｃとを連絡するもの
で、調整手段１６によって制御された空気が機関側の吸
気路２Ｃに供給される。The operation of the engine at the minimum opening of the sliding throttle valve 13 is performed as follows. The sliding throttle valve 13 is returned to the lowermost position by the spring 17, and the lower end 13B of the engine side facing side surface 13A of the sliding throttle valve 13 enters further below the lower bottom portion 2A of the intake passage 2, Lower bottom part 3A of sliding throttle valve guide cylinder 3
Is in contact with. (Not contacted in FIGS. 5 and 6 for ease of explanation) In this state, near the lower end 13B of the engine side facing side surface 13A of the sliding throttle valve 13,
It is arranged so as to face and contact the step portion 4, and holds the intake passage 2 in a fully closed state. Therefore, air does not flow from the intake passage 2B on the air cleaner side to the intake passage 2C on the engine side via the sliding throttle valve 13. The sliding throttle valve 13 keeps the intake passage 2 fully closed. On the other hand, the bypass air passage 15 has the adjusting means 1
The amount of passing air is controlled by 6 and the bypass air passage 15 bypasses the sliding throttle valve 13 to connect the intake passage 2B on the air cleaner side and the intake passage 2C on the engine side, and is controlled by the adjusting means 16. The generated air is supplied to the intake passage 2C on the engine side.
【０００４】かかる状態において機関が運転されると、
機関に向けて調整手段１６によって制御された空気がエ
アクリーナ側の吸気路２Ｂから摺動絞り弁１３を迂回し
て機関側の吸気路２Ｃ内に供給される。一方、燃料はパ
イロットアウトレット孔１２より機関側の吸気路２Ｃ内
に吸出される。而して、この燃料と空気によって形成さ
れる混合気で機関の最低回転が保証される。When the engine is operated in such a state,
The air controlled by the adjusting means 16 toward the engine is supplied from the intake passage 2B on the air cleaner side into the intake passage 2C on the engine side, bypassing the sliding throttle valve 13. On the other hand, the fuel is sucked into the intake passage 2C on the engine side from the pilot outlet hole 12. Thus, the air-fuel mixture formed by this fuel and air guarantees the minimum engine speed.
【０００５】かかる従来の摺動絞り弁型気化器による
と、前記摺動絞り弁１３の全閉状態から摺動絞り弁１３
をわずかに開放する摺動絞り弁１３の微少開度開放域に
おける機関の良好な回転応答性を得ることが困難であ
る。これは摺動絞り弁１３の機関側対向側面１３Ａの下
端１３Ｂが吸気路２の下方底部２Ａより更に没入した摺
動絞り弁案内筒３の下方底部３Ａに当接して配置されて
いることによる。すなわち、機関の最低回転時には、摺
動絞り弁１３の機関側対向側面１３Ａの下端１３Ｂは、
摺動絞り弁案内筒３の下方底部３Ａに当接した状態にあ
って、前記下端１３Ｂは吸気路２の下方底部２Ａより段
差Ｈだけ下方に位置し、下端１３Ｂ近傍は段部４に接触
して配置される。この状態は、図７において点線で示さ
れる。そして、摺動絞り弁１３の微少開度開放時におい
て、摺動絞り弁１３が段差Ｈより小なる範囲ｈでわずか
に上方に開放移動した際、機関側対向側面１３Ａの下端
１３Ｂが未だ吸気路２の下方底部２Ａに達することがな
く、その下端１３Ｂが吸気路２を開放しない。この状態
は、図７の一点鎖線で示される。以上によると、摺動絞
り弁１３が微少開放動作されたにも拘らず機関へ供給さ
れる空気量は何等増量されることがなく、依然としてバ
イパス空気通路１５によって制御された最低回転時にお
ける一定の空気のみが機関に向けて供給される。従っ
て、摺動絞り弁１３の微少開放動作に対する空気量の増
加を得ることができず機関の回転数をその開放に応じて
上昇させることができない。According to such a conventional sliding throttle valve type carburetor, the sliding throttle valve 13 is opened from the fully closed state.
It is difficult to obtain good rotational response of the engine in the minute opening opening range of the sliding throttle valve 13 that slightly opens the valve. This is because the lower end 13B of the engine-side facing side surface 13A of the sliding throttle valve 13 is disposed in contact with the lower bottom portion 3A of the sliding throttle valve guide cylinder 3 further recessed from the lower bottom portion 2A of the intake passage 2. That is, at the minimum rotation of the engine, the lower end 13B of the engine side facing side surface 13A of the sliding throttle valve 13 is
The lower end 13B is located below the lower bottom 2A of the intake passage 2 by a step H while being in contact with the lower bottom 3A of the sliding throttle valve guide cylinder 3, and the vicinity of the lower end 13B is in contact with the step 4. Are arranged. This state is shown by the dotted line in FIG. Then, when the sliding throttle valve 13 is slightly opened, when the sliding throttle valve 13 moves slightly upward in the range h smaller than the step H, the lower end 13B of the engine side facing side surface 13A still has the intake passage. 2 does not reach the lower bottom portion 2A, and its lower end 13B does not open the intake passage 2. This state is shown by the alternate long and short dash line in FIG. According to the above, the amount of air supplied to the engine is not increased in spite of the slight opening operation of the sliding throttle valve 13 and is still constant at the minimum rotation speed controlled by the bypass air passage 15. Only air is supplied to the engine. Therefore, it is not possible to obtain an increase in the amount of air with respect to the minute opening operation of the sliding throttle valve 13, and it is not possible to increase the rotational speed of the engine according to the opening.
【０００６】本発明はかかる不具合に鑑み成されたもの
で、摺動絞り弁によって吸気路を全閉状態とし、摺動絞
り弁を迂回してバイパス空気通路より吸気路に供給され
る空気量によって機関の最低回転を得る摺動絞り弁型気
化器において、摺動絞り弁の微少開度開放域における機
関の良好な回転応答性を得ることにある。The present invention has been made in view of the above problems, and the sliding throttle valve fully closes the intake passage to bypass the sliding throttle valve to control the amount of air supplied from the bypass air passage to the intake passage. In a sliding throttle valve type carburetor for obtaining the minimum rotation of the engine, it is to obtain a good rotational response of the engine in a small opening opening range of the sliding throttle valve.
【０００７】[0007]
【課題を解決する為の手段】前記目的を達成する為に本
発明は、気化器本体を貫通する吸気路に絞り弁案内筒が
連設されるとともに絞り弁案内筒には、少なくとも吸気
路を全閉状態に保持しうる摺動絞り弁が移動自在に配置
され、更に摺動絞り弁を迂回して機関側の吸気路とエア
クリーナ側の吸気路とを連絡するバイパス空気通路を備
えた摺動絞り弁型気化器において、摺動絞り弁の機関側
対向側面に、吸気路の横断面の中心を通る垂線の側方に
位置し、垂線に沿う切欠き孔を穿設し、摺動絞り弁によ
る吸気路の全閉状態において、前記切欠き孔の上部を吸
気路内に向けて開口したことを特徴とする。In order to achieve the above-mentioned object, the present invention has a throttle valve guide cylinder continuously connected to an intake passage penetrating the carburetor main body and at least the intake passage is provided in the throttle valve guide cylinder. A sliding throttle valve that can be held in a fully closed state is movably arranged, and further a bypass air passage that bypasses the sliding throttle valve and connects the intake passage on the engine side and the intake passage on the air cleaner side is provided. In a throttle valve type carburetor, a sliding throttle valve is provided on the side surface of the sliding throttle valve facing the engine side, which is located on the side of a perpendicular line passing through the center of the cross section of the intake passage and along which the cutout hole is formed. In the fully closed state of the intake passage, the upper part of the cutout hole is opened toward the inside of the intake passage.
【０００８】本発明によると機関に供給される最低空気
量はバイパス空気通路を介して供給される空気量と、吸
気路に開口する切欠き孔から供給される空気量との合計
空気量によって決定される。摺動絞り弁が吸気路を全閉
状態に保持した状態から、摺動絞り弁を微少開放動作す
ると、切欠き孔の吸気路に対する開口が増加し、摺動絞
り弁の微少開放動作に応じて即座に機関へ供給される空
気量を増量でき、これによって良好な機関の回転応答性
を得ることができる。According to the present invention, the minimum air amount supplied to the engine is determined by the total air amount of the air amount supplied via the bypass air passage and the air amount supplied from the notch hole opening in the intake passage. To be done. If the sliding throttle valve is opened slightly from the state where the sliding throttle valve keeps the intake passage fully closed, the opening of the notch hole to the intake passage increases and the sliding throttle valve slightly opens. It is possible to immediately increase the amount of air supplied to the engine, and thereby obtain good engine rotational response.
【０００９】[0009]
【実施例】以下、本発明になる摺動絞り弁型気化器の一
実施例を図１、図２、図３により説明する。図１は縦断
面図、図２は図１の左側面図、図３は図１のＣ−Ｃ線に
おける横断面図である。尚、図５、図６と同一構造部分
は同一符号を使用して説明を省略する。尚、図５に示さ
れる従来例とは摺動絞り弁が異なる。摺動絞り弁案内筒
３内に移動自在に配置される摺動絞り弁２０は以下の如
く形成される。摺動絞り弁２０の機関側対向側面２０Ａ
の下端２０Ｂの近傍に切欠き孔２０Ｃが穿設される。こ
の切欠き孔２０Ｃは吸気路２の横断面の中心Ａを通る垂
線Ｘ−Ｘの側方にあって機関側対向側面２０Ａを貫通し
て形成されるとともに垂線Ｘ−Ｘに沿って穿設される。
この垂線Ｘ−Ｘに沿うとは、摺動絞り弁２０の開放方向
Ｙ−Ｙに沿うことであって機関側対向側面２０Ａの下端
２０Ｂから上方に向かうことである。そして摺動絞り弁
２０の下端２０Ｂが摺動絞り弁案内筒３の下方底部３Ａ
に当接した摺動絞り弁２０の全閉時において、この切欠
き孔２０Ｃは段部４に接触し、切欠き孔２０Ｃの上部２
０Ｃ’は、吸気路２に開口する。すなわち、摺動絞り弁
２０の全閉時において、切欠き孔２０Ｃの上部２０Ｃ’
は吸気路２に開口し、上部２０Ｃ’より下方の切欠き孔
２０Ｃは、段部４に接触して吸気路２に開口しない。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a sliding throttle valve type carburetor according to the present invention will be described below with reference to FIGS. 1, 2 and 3. 1 is a longitudinal sectional view, FIG. 2 is a left side view of FIG. 1, and FIG. 3 is a lateral sectional view taken along the line C-C of FIG. It should be noted that the same structural parts as those in FIGS. The sliding throttle valve is different from the conventional example shown in FIG. The sliding throttle valve 20 movably arranged in the sliding throttle valve guide cylinder 3 is formed as follows. Engine side facing side surface 20A of sliding throttle valve 20
A cutout hole 20C is formed in the vicinity of the lower end 20B. The cutout hole 20C is formed on the side of a perpendicular line XX that passes through the center A of the cross section of the intake passage 2 and penetrates the engine side facing side surface 20A and is formed along the perpendicular line XX. It
To be along the perpendicular line XX means to be along the opening direction YY of the sliding throttle valve 20 and to be upward from the lower end 20B of the engine side facing side surface 20A. The lower end 20B of the sliding throttle valve 20 is at the lower bottom portion 3A of the sliding throttle valve guide cylinder 3.
When the sliding throttle valve 20 that is in contact with the above is fully closed, the notch hole 20C contacts the step portion 4 and the upper portion 2 of the notch hole 20C is contacted.
0C ′ opens to the intake passage 2. That is, when the sliding throttle valve 20 is fully closed, the upper portion 20C 'of the cutout hole 20C is
Is opened to the intake passage 2, and the notch hole 20C below the upper portion 20C 'contacts the step portion 4 and is not opened to the intake passage 2.
【００１０】次にその作用について説明する。まず、機
関の最低回転は以下によって保証される。摺動絞り弁２
０は、スプリング１７によってもっとも下方に押圧され
て移動し、このとき摺動絞り弁２０の下端２０Ｂが摺動
絞り弁案内筒３の下方底部３Ａに当接して、吸気路２は
この摺動絞り弁２０によって全閉保持される。かかる状
態において、摺動絞り弁２０の機関側対向側面２０Ａの
下端２０Ｂ近傍に穿設された切欠き孔２０Ｃは段部４に
臨んで配置され、切欠き孔２０Ｃの上部２０Ｃ’は、吸
気路２に開口し、上部２０Ｃ’より下方にある切欠き孔
２０Ｃは段部４に接触して配置され、吸気路２に開口し
ない。一方バイパス空気通路１５の下流側は調整手段１
６を介して機関側の吸気路２Ｃに連絡される。Next, the operation will be described. First, the minimum engine speed is guaranteed by: Sliding throttle valve 2
0 moves by being pressed downward most by the spring 17, and at this time, the lower end 20B of the sliding throttle valve 20 comes into contact with the lower bottom portion 3A of the sliding throttle valve guide cylinder 3, and the intake passage 2 is moved to this sliding throttle valve. It is held fully closed by the valve 20. In this state, the notch hole 20C formed near the lower end 20B of the engine-side facing side surface 20A of the sliding throttle valve 20 is arranged so as to face the step portion 4, and the upper portion 20C 'of the notch hole 20C is the intake passage. The notch hole 20C which is open to 2 and is below the upper part 20C ′ is arranged in contact with the step portion 4 and does not open to the intake passage 2. On the other hand, the adjusting means 1 is provided on the downstream side of the bypass air passage 15.
It is connected to the intake passage 2C on the engine side via 6.
【００１１】以上によると、機関側の吸気路２Ｃ内には
調整手段１６によって制御された空気がバイパス空気通
路１５を介して供給され、さらに切欠き孔２０Ｃの上部
２０Ｃ’の開口を介して機関側対向側面２０Ａの上流側
吸気路２Ｄから下流側吸気路２Ｅに向けて、切欠き孔２
０Ｃの上部２０Ｃ’によって制御された空気が供給され
る。すなわち、機関側の吸気路２Ｃ内には、バイパス空
気通路１５と切欠き孔２０Ｃの上部２０Ｃ’とよりそれ
ぞれ制御された空気が供給される。一方、機関側の吸気
路２Ｃには、パイロットアウトレット孔１２を介して低
速燃料系Ｓ内の低速混合気が供給され、これによって機
関の最低回転が得られる。かかる摺動絞り弁２０の全閉
状態は図４に示されるもので、切欠き孔２０Ｃの上部２
０Ｃ’が吸気路２に開口し、上部２０Ｃ’より下方の切
欠き孔２０Ｃが段部４に接触し、段部４にてこの切欠き
孔２０Ｃが閉塞されていることがよく理解される。According to the above, the air controlled by the adjusting means 16 is supplied into the intake passage 2C on the engine side through the bypass air passage 15, and the engine is also opened through the opening of the upper portion 20C 'of the cutout hole 20C. The cutout hole 2 is formed from the upstream side intake passage 2D of the side facing side surface 20A toward the downstream side intake passage 2E.
Air controlled by the top 20C 'of 0C is supplied. That is, the air controlled by the bypass air passage 15 and the upper portion 20C ′ of the cutout hole 20C is supplied into the intake passage 2C on the engine side. On the other hand, the low-speed air-fuel mixture in the low-speed fuel system S is supplied to the intake passage 2C on the engine side through the pilot outlet hole 12, whereby the minimum rotation of the engine is obtained. The fully closed state of the sliding throttle valve 20 is shown in FIG. 4, and the upper portion 2 of the cutout hole 20C is shown.
It is well understood that 0C ′ opens to the intake passage 2, the cutout hole 20C below the upper portion 20C ′ contacts the step portion 4, and the cutout hole 20C is closed at the step portion 4.
【００１２】尚、前記摺動絞り弁２０の全閉状態におい
て、切欠き孔２０Ｃの上部２０Ｃ’が吸気路２に開口
し、この上部２０Ｃ’が機関側対向側面２０Ａの上流側
吸気路２Ｄと下流側吸気路２Ｅとを連絡してエアクリー
ナ側の吸気路２Ｂから機関側の吸気路２Ｃに向けて空気
が流れるが、機関側対向側面２０Ａの上流側吸気路２Ｄ
の室容積が切欠き孔２０Ｃの上部２０Ｃ’より充分に大
であること、及び切欠き孔２０Ｃが、バイパス孔１１及
びニードルジエット７が開口する軸心に対して側方に偏
芯して開口することから、切欠き孔２０Ｃの上部２０
Ｃ’を通過する空気流が直接的にバイパス孔１１及びニ
ードルジエット７に作用することがなく、更には前記空
気流によって生起される負圧が上昇しないので、それら
バイパス孔１１、ニードルジエット７より混合気を吸気
路２内に吸出するものでない。このことは、摺動絞り弁
２０が高開度より全閉に戻される機関の減速運転時にお
いて、バイパス孔１１、ニードルジエット７から混合気
を吸出し、機関に向かう混合気を過濃とすることがな
い。仮にこの切欠き孔が吸気路２の横断面の中心Ａを通
る垂線Ｘ−Ｘ上に穿設されたとすると、切欠き孔の上部
を通過する空気流が直接的にバイパス孔１１、ニードル
ジエット７に作用することになり、バイパス孔１１、ニ
ードルジエット７から混合気を吸気路２内に吸出するこ
とになる。In the fully closed state of the sliding throttle valve 20, the upper portion 20C 'of the cutout hole 20C opens to the intake passage 2 and the upper portion 20C' serves as the upstream intake passage 2D of the engine side facing side surface 20A. Air flows from the intake passage 2B on the air cleaner side to the intake passage 2C on the engine side by communicating with the downstream intake passage 2E, but the upstream intake passage 2D on the engine-side facing side surface 20A
Is sufficiently larger than the upper portion 20C 'of the cutout hole 20C, and the cutout hole 20C is eccentrically opened laterally with respect to the axial center where the bypass hole 11 and the needle jet 7 are opened. Therefore, the upper portion 20 of the cutout hole 20C
Since the air flow passing through C ′ does not directly act on the bypass hole 11 and the needle jet 7, and the negative pressure generated by the air flow does not rise, the bypass hole 11 and the needle jet 7 The air-fuel mixture is not sucked into the intake passage 2. This means that during deceleration operation of the engine in which the sliding throttle valve 20 is fully closed from a high opening, the air-fuel mixture is sucked from the bypass hole 11 and the needle jet 7 and the air-fuel mixture toward the engine becomes rich. There is no. If this cutout hole is formed on a perpendicular line XX that passes through the center A of the cross section of the intake passage 2, the air flow passing through the upper portion of the cutout hole directly passes through the bypass hole 11 and the needle jet 7. Therefore, the air-fuel mixture is sucked into the intake passage 2 from the bypass hole 11 and the needle jet 7.
【００１３】次に摺動絞り弁２０を前記全閉状態からわ
ずかに開放する微少開度開放域について説明する。摺動
絞り弁２０を図４において、開放方向Ｙ−Ｙの上方向に
向かってわずかに引上げると、切欠き孔２０Ｃもまた摺
動絞り弁２０と同期して開放方向Ｙ−Ｙの上方向に向か
って移動し、切欠き孔２０Ｃの上部２０Ｃ’より下方の
切欠き孔２０Ｃは段部４との接触を解かれ、切欠き孔２
０Ｃは摺動絞り弁２０の上動に応じて機関側の吸気路２
Ｃ内に臨んで開口する。以上によると、切欠き孔２０Ｃ
を介して機関側対向側面２０Ａの上流側吸気路２Ｄから
機関側対向側面２０Ａの下流側吸気路２Ｅ（機関側の吸
気路２Ｃに相当する）に向けて切欠き孔２０Ｃの開口に
応じた増量された空気が流入する。これによるとバイパ
ス空気通路１５からの空気量に加え、摺動絞り弁２０の
微少開度開放に応じた空気量を増量しうるもので、この
空気量の増量に応じて機関の回転数を最低回転より上昇
できる。Next, the minute opening opening range for slightly opening the sliding throttle valve 20 from the fully closed state will be described. When the sliding throttle valve 20 is slightly pulled upward in the opening direction Y-Y in FIG. 4, the notch hole 20C also synchronizes with the sliding throttle valve 20 and opens in the opening direction Y-Y upward. The notch hole 20C below the upper portion 20C ′ of the notch hole 20C is released from contact with the step portion 4, and the notch hole 2
0C indicates the intake passage 2 on the engine side according to the upward movement of the sliding throttle valve 20.
It faces C and opens. According to the above, the notch hole 20C
Via the upstream side intake passage 2D of the engine side facing side surface 20A to the downstream side intake passage 2E of the engine side facing side surface 20A (corresponding to the engine side intake passage 2C) in accordance with the opening of the cutout hole 20C. The air that has been discharged flows in. According to this, in addition to the amount of air from the bypass air passage 15, it is possible to increase the amount of air in accordance with the opening of the sliding throttle valve 20 by a very small amount. It can rise more than rotation
【００１４】そして、摺動絞り弁２０の下端２０Ｂが、
吸気路２の下方底部２Ａに達する迄の微少開度開放域に
おいて、摺動絞り弁２０の開放移動量に応じて切欠き孔
２０Ｃの吸気路２内への開口が漸次増加するもので、こ
れによって摺動絞り弁２０の微少開度開放域において摺
動絞り弁２０の開放に応じて空気量を増量しうる。以上
によると、特に摺動絞り弁２０の微少開度開放域におい
て、摺動絞り弁２０の開放に応じて機関の回転数を上昇
することができて回転応答性を効果的に高めることがで
きた。The lower end 20B of the sliding throttle valve 20 is
The opening of the notch hole 20C into the intake passage 2 gradually increases in accordance with the opening movement amount of the sliding throttle valve 20 in the small opening opening range until the lower bottom portion 2A of the intake passage 2 is reached. Thus, the air amount can be increased in accordance with the opening of the sliding throttle valve 20 in the small opening opening range of the sliding throttle valve 20. According to the above, the engine speed can be increased according to the opening of the sliding throttle valve 20, particularly in the minute opening opening range of the sliding throttle valve 20, and the rotational response can be effectively improved. It was
【００１５】又、切欠き孔２０Ｃを吸気路２の横断面の
中心Ａを通る垂線Ｘ−Ｘの側方に配置したことによる
と、切欠き孔２０Ｃの摺動絞り弁２０の開放方向Ｙ−Ｙ
に沿う長さＬを大きくとることができる。以上による
と、摺動絞り弁２０の下端２０Ｂが吸気路２の下方底部
２Ａに達した後において更に摺動絞り弁２０が開放され
た際、下端２０Ｂと吸気路２によって形成される開口
に、切欠き孔２０Ｃの開口を加えることができるので、
摺動絞り弁２０の微少開度域における空気の増量特性を
高めることができ、もって機関の回転立上りをより一層
向上できる。Further, since the cutout hole 20C is arranged on the side of the perpendicular line XX passing through the center A of the cross section of the intake passage 2, the cutout hole 20C is opened in the opening direction Y- of the sliding throttle valve 20. Y
The length L along the length can be set to be large. According to the above, when the sliding throttle valve 20 is further opened after the lower end 20B of the sliding throttle valve 20 reaches the lower bottom portion 2A of the intake passage 2, the opening formed by the lower end 20B and the intake passage 2, Since the opening of the notch hole 20C can be added,
It is possible to enhance the air increasing characteristic of the sliding throttle valve 20 in the minute opening range, and thus to further improve the rotation start of the engine.
【００１６】[0016]
【発明の効果】以上の如く、本発明になる摺動絞り弁型
気化器によると、摺動絞り弁の全閉状態の初期から、摺
動絞り弁の微少開放開度域において、摺動絞り弁の開放
動作に応じて機関へ供給される空気量を増量できたもの
である。従って摺動絞り弁の微少開放開度域における機
関の良好な回転応答性を得ることができ、更には機関の
加速運転を良好に行ないうるものである。又、切欠き孔
を、吸気路の横断面の中心を通る垂線の側方に形成した
ことによると、摺動絞り弁の下端が吸気路の下方底部に
達した後において更に摺動絞り弁が開放された際、切欠
き孔によって更に空気量を増量することができて、空気
の増量特性を高めることができる。従って機関の回転立
上りを一層向上できる。As described above, according to the sliding throttle valve type carburetor according to the present invention, the sliding throttle valve can be operated in the minute opening range of the sliding throttle valve from the initial state of the sliding throttle valve being fully closed. The amount of air supplied to the engine could be increased according to the opening operation of the valve. Therefore, it is possible to obtain a good rotational responsiveness of the engine in the minute opening degree range of the sliding throttle valve, and it is possible to perform the acceleration operation of the engine satisfactorily. Further, since the notch hole is formed on the side of the vertical line passing through the center of the cross section of the intake passage, the sliding throttle valve is further reduced after the lower end of the sliding throttle valve reaches the lower bottom of the intake passage. When opened, the notch hole can further increase the air amount, and the air increasing characteristic can be enhanced. Therefore, the rotation start of the engine can be further improved.
【図１】本発明になる摺動絞り弁型気化器の一実施例を
示す縦断面図。FIG. 1 is a longitudinal sectional view showing an embodiment of a sliding throttle valve type carburetor according to the present invention.
【図２】図１の左方の側面図。FIG. 2 is a left side view of FIG.
【図３】図１のＣ−Ｃ線における横断面図。FIG. 3 is a cross-sectional view taken along the line CC of FIG.
【図４】図１の摺動絞り弁の簡略拡大図。4 is a simplified enlarged view of the sliding throttle valve of FIG.
【図５】従来の摺動絞り弁型気化器の縦断面図。FIG. 5 is a vertical cross-sectional view of a conventional sliding throttle valve type carburetor.
【図６】図５の左方の側面図。FIG. 6 is a left side view of FIG.
【図７】図５の摺動絞り弁の簡略拡大図。7 is a simplified enlarged view of the sliding throttle valve of FIG.
２０ 摺動絞り弁 ２０Ａ 機関側対向側面 Ａ 吸気路の横断面の中心 Ｘ−Ｘ 中心Ａを通る垂線 ２０Ｃ 切欠き孔 ２０Ｃ’切欠き孔の上部 20 Sliding throttle valve 20A Engine side facing side surface A Center of cross section of intake passage XX Vertical line passing through center A 20C Notched hole 20C 'Upper part of notched hole
Claims (1)
内筒が連設されるとともに絞り弁案内筒には、少なくと
も吸気路を全閉状態に保持しうる摺動絞り弁が移動自在
に配置され、更に摺動絞り弁を迂回して機関側の吸気路
とエアクリーナ側の吸気路とを連絡するバイパス空気通
路を備えた摺動絞り弁型気化器において、摺動絞り弁２
０の機関側対向側面２０Ａに、吸気路２の横断面の中心
Ａを通る垂線Ｘ−Ｘの側方に位置し、垂線Ｘ−Ｘに沿う
切欠き孔２０Ｃを穿設し、摺動絞り弁２０による吸気路
２の全閉状態において、前記切欠き孔の上部２０Ｃ’を
吸気路２内に向けて開口したことを特徴とする摺動絞り
弁型気化器。1. A throttle valve guide cylinder is connected to an intake passage penetrating the carburetor body, and a sliding throttle valve capable of holding at least the intake passage in a fully closed state is movable in the throttle valve guide cylinder. A sliding throttle valve type carburetor that is arranged and further includes a bypass air passage that bypasses the sliding throttle valve and connects the intake passage on the engine side to the intake passage on the air cleaner side.
No. 20C on the engine side facing side surface 20A, which is located on the side of the perpendicular line XX passing through the center A of the cross section of the intake passage 2 and along the perpendicular line XX, is provided to form a sliding throttle valve. In a fully closed state of the intake passage 2 by 20, a sliding throttle valve type carburetor characterized in that an upper portion 20C ′ of the cutout hole is opened toward the inside of the intake passage 2.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP21806195A JP3680369B2 (en) | 1995-08-03 | 1995-08-03 | Sliding throttle valve type vaporizer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP21806195A JP3680369B2 (en) | 1995-08-03 | 1995-08-03 | Sliding throttle valve type vaporizer |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0942061A true JPH0942061A (en) | 1997-02-10 |
| JP3680369B2 JP3680369B2 (en) | 2005-08-10 |
Family
ID=16714040
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP21806195A Expired - Fee Related JP3680369B2 (en) | 1995-08-03 | 1995-08-03 | Sliding throttle valve type vaporizer |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3680369B2 (en) |
-
1995
- 1995-08-03 JP JP21806195A patent/JP3680369B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JP3680369B2 (en) | 2005-08-10 |
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