JPH0232837Y2

JPH0232837Y2 -

Info

Publication number: JPH0232837Y2
Application number: JP1982180061U
Authority: JP
Priority date: 1982-11-30
Filing date: 1982-11-30
Publication date: 1990-09-05
Also published as: JPS5985339U

Description

【考案の詳細な説明】〔考案の目的〕（産業上の利用分野）この考案は、エンジンの低速域の性能向上を図
ることができるように改善した気化器に関する。[Detailed Description of the Invention] [Purpose of the Invention] (Field of Industrial Application) This invention relates to an improved carburetor that can improve the performance of an engine in the low speed range.

（従来の技術および考案が解決しようとする課
題）気化器は、エンジンの吸気孔に連結する主吸気
通路があつて、この主吸気通路の途中にスロツト
ル弁があり、スロツトル弁を開閉調節して、吸気
量をコントロールしている。ところが、主吸気通
路の径は、エンジンを高速運転したときに十分な
量の空気が流れることできる太さに設定してあ
る。このため、スロツトル弁の低開度の低速域で
は、スロツトル弁の直後から、主吸気通路が太く
て、吸気の流れが遅くエンジンの性能が不足する
原因になる。(Problems to be solved by conventional technology and inventions) A carburetor has a main intake passage connected to the intake hole of the engine, and a throttle valve in the middle of this main intake passage. , controls the amount of air intake. However, the diameter of the main intake passage is set to a thickness that allows a sufficient amount of air to flow when the engine is operated at high speed. For this reason, in a low speed range with a low opening degree of the throttle valve, the main intake passage is thick immediately after the throttle valve, and the flow of intake air is slow, causing insufficient engine performance.

そこで、吸気通路中にスロツトル弁とは別に蝶
弁形の如きガイド板を設け、吸気の流れの量によ
つて上記ガイド板の開度を調整し、吸気の流れが
遅くなることを防止することも提案されている。 Therefore, a butterfly-shaped guide plate is provided in the intake passage in addition to the throttle valve, and the opening degree of the guide plate is adjusted depending on the amount of intake air flow to prevent the intake air flow from slowing down. has also been proposed.

しかしながら、摺動型のスロツトル弁を設けた
ものにおいては、上記スロツトル弁の上下によつ
て吸気通路の開口面積が制御されるので、スロツ
トル弁部の開口は単一となるのに対し、このよう
な気化器において上述の如きガイド板を設けた場
合には、そのガイド板部においては開口が上下２
個所となり、吸気の流れが直線的でなくなり、通
気抵抗が増大し、流速の増大化が十分達成されな
い等の問題がある。 However, in those equipped with a sliding type throttle valve, the opening area of the intake passage is controlled by the upper and lower positions of the throttle valve, so the throttle valve part has a single opening. When a guide plate as described above is provided in a vaporizer, the guide plate part has two openings, one above and one above.
There are problems such as the flow of intake air becomes non-linear, the ventilation resistance increases, and a sufficient increase in flow velocity is not achieved.

本考案はこのような点に鑑み、摺動型スロツト
ル弁を設けた気化器においても、低速時のエンジ
ン性能の向上が図れるようにした気化器を得るこ
とを目的とする。 In view of these points, it is an object of the present invention to provide a carburetor that can improve engine performance at low speeds even in a carburetor equipped with a sliding throttle valve.

〔考案の構成〕[Structure of the idea]

（課題を解決するための手段）本考案は、横方向通気型の摺動スロツトル弁の
気化器において、気化器の主吸気通路のスロツト
ル弁の下流側に、上側に揺動されたとき主吸気通
路の内壁面に密着するような断面円弧状のガイド
板を、自重によつて閉方向に付勢されるとともに
吸気流によつて開方向に作動されるように回動自
在に軸着したことを特徴とするものである。 (Means for Solving the Problems) The present invention provides a side ventilation type sliding throttle valve carburetor, in which the main intake air is placed on the downstream side of the throttle valve in the main intake passage of the carburetor when the main intake passage is swung upward. A guide plate with an arcuate cross section that is in close contact with the inner wall surface of the passage is rotatably pivoted so that it is biased in the closing direction by its own weight and operated in the opening direction by the intake air flow. It is characterized by:

（作用）スロツトル弁の開度が小さい低速域のときはガ
イド板が自重によつて閉方向に下つており、主吸
気通路の開口面積が小さくなつている。このた
め、吸気の流速が速くなつてエンジン性能が向上
する。一方、高速域においては上記ガイド板が吸
気の流れによつて上方に回動され、主吸気通路の
内壁面に密着するようになるので、吸気の通気抵
抗は殆どなく、十分な吸気の流れが確保される。(Function) When the throttle valve is in a low speed range with a small opening, the guide plate moves down in the closing direction due to its own weight, reducing the opening area of the main intake passage. Therefore, the flow velocity of intake air becomes faster and engine performance improves. On the other hand, at high speeds, the guide plate is rotated upward by the flow of intake air and comes into close contact with the inner wall surface of the main intake passage, so there is almost no ventilation resistance to the intake air and a sufficient flow of intake air is achieved. Secured.

（実施例）以下本考案を図面に示す実施例について説明す
る。(Example) An example of the present invention shown in the drawings will be described below.

気化器１には主吸気通路２が設けてあつて、主
吸気通路２の一端は、エアークリーナー出口３に
連結し、他端をエンジンの吸気孔４に連結する。
主吸気通路２の内径は、エンジンを高速運転した
ときにも吸気量が不足しない太さに設定されてい
る。主吸気通路２の途中には、上下に摺動するス
ロツトル弁５が設けられ、スロツトル弁５の上下
によつて、主吸気通路２の開口面積をコントロー
ルして、吸気量を調整する。スロツトル弁５の下
側には、メインノズル６が開口していて、燃料が
霧化されて吸気に混入される。しかして本考案
は、主吸気通路２のスロツトル弁５の下流側に、
断面円弧状で、上側に上げたとき、主吸気通路２
の壁面に密着する形状のガイド板７の両端を、軸
８で回動自在に軸着する。 The carburetor 1 is provided with a main intake passage 2, one end of which is connected to an air cleaner outlet 3, and the other end connected to an intake hole 4 of the engine.
The inner diameter of the main intake passage 2 is set to such a thickness that the amount of intake air will not be insufficient even when the engine is operated at high speed. A throttle valve 5 that slides up and down is provided in the middle of the main intake passage 2, and by moving the throttle valve 5 up and down, the opening area of the main intake passage 2 is controlled and the amount of intake air is adjusted. A main nozzle 6 is opened below the throttle valve 5, and fuel is atomized and mixed into the intake air. However, in the present invention, on the downstream side of the throttle valve 5 of the main intake passage 2,
The cross section is arcuate, and when raised upwards, the main intake passage 2
Both ends of a guide plate 7, which is shaped to be in close contact with a wall surface, are rotatably attached to a shaft 8.

しかして、スロツトル弁５の開度の小さい速度
域のときは、ガイド弁は、吸気の流れに均合うま
で、重力で図に二点鎖線で示すように、矢印で示
すように下つていて、主吸気通路２の開口面積を
少くする。このため、吸気の流速が早くなつて、
エンジン性能が向上し、加速時のレスポンスもよ
くなる。スロツトル弁５を大きく開いた高速域に
なると、吸気量も増大し、ガイド板７を吸気の流
れによつて、重量に抗して上側に押し上げる。こ
のため、十分な吸気の流れが確保でき、出力も十
分発生できる。 However, when the throttle valve 5 is in a speed range where the opening degree is small, the guide valve moves down due to gravity as shown by the arrow, as shown by the two-dot chain line in the figure, until it is balanced with the flow of intake air. , the opening area of the main intake passage 2 is reduced. For this reason, the flow rate of intake air becomes faster,
Engine performance is improved and response during acceleration is also improved. When the throttle valve 5 is wide open in the high speed range, the amount of intake air also increases, and the flow of intake air pushes the guide plate 7 upward against its weight. Therefore, a sufficient flow of intake air can be ensured and sufficient output can be generated.

〔考案の効果〕[Effect of idea]

以上説明したように、この考案は、気化器の主
吸気通路のスロツトル弁の下流側に吸気の流れの
量によつて重力に抗して吸気通路が広くなるよう
に可動する断面円弧状のガイド板を回動自在に軸
着したので、吸気量の少い低速域では、ガイド板
が重力によつて下つて主吸気通路面積を小さく
し、吸気の流速を早めてエンジン性能を向上させ
ることができ、加速時のレスポンスもよくなる。
しかも、この場合摺動スロツトル弁とガイド板の
開口位置が主吸気通路の軸上で一致しており、吸
気の流れが直線的となり、流速を効果的に上昇さ
せることができる。また吸気量の多い高速域で
は、吸気の流れでガイド板が押上げられ、ガイド
板が主吸気通路の内壁面に密着するようになるの
で、吸気に対する抵抗となるようなことがなく、
十分な吸気量を確保できて、出力の低下もない。
しかも、ガイド板が自重によつて閉方向に付勢さ
れるようにしたので、ガイド板に特別な作動装置
を設ける必要がなく、外部と通じる軸やシールす
べき個所等も不必要で、作動抵抗が小さく応答性
もよい。 As explained above, this invention has a guide with an arcuate cross section that moves downstream of the throttle valve in the main intake passage of the carburetor so that the intake passage becomes wider against gravity depending on the amount of intake air flow. Since the plate is rotatably attached to the shaft, at low speeds where the amount of intake air is small, the guide plate lowers due to gravity, reducing the area of the main intake passage and increasing the flow rate of intake air, improving engine performance. This also improves the response during acceleration.
Moreover, in this case, the opening positions of the sliding throttle valve and the guide plate coincide on the axis of the main intake passage, so that the flow of intake air becomes linear, and the flow velocity can be effectively increased. In addition, at high speeds where the amount of intake air is large, the flow of intake air pushes up the guide plate and it comes into close contact with the inner wall of the main intake passage, so there is no resistance to intake air.
Sufficient intake air volume can be secured and there is no decrease in output.
Moreover, since the guide plate is biased in the closing direction by its own weight, there is no need to provide a special actuating device for the guide plate, and there is no need for a shaft communicating with the outside or a sealing part. Low resistance and good response.

【図面の簡単な説明】[Brief explanation of drawings]

図は本考案の一実施例を示し、第１図は縦断側
面図、第２図は正面図である。１……気化器、２……主吸気通路、５……スロ
ツトル弁、７……ガイド板。 The drawings show an embodiment of the present invention, with FIG. 1 being a longitudinal sectional side view and FIG. 2 being a front view. 1... Carburetor, 2... Main intake passage, 5... Throttle valve, 7... Guide plate.

Claims

【実用新案登録請求の範囲】[Scope of utility model registration request]

横方向通気型の摺動スロツトル弁の気化器にお
いて、気化器の主吸気通路のスロツトル弁の下流
側に、上側に揺動されたとき主吸気通路の内壁面
に密着するような断面円弧状のガイド板を、自重
によつて閉方向に付勢されるとともに吸気流によ
つて開方向に作動されるように回動自在に軸着し
たことを特徴とする気化器。 In a horizontally vented sliding throttle valve carburetor, there is an arc-shaped cross-section on the downstream side of the throttle valve in the main intake passage of the carburetor, which is in close contact with the inner wall surface of the main intake passage when the carburetor is swung upward. A carburetor characterized in that a guide plate is rotatably mounted on a shaft so that the guide plate is biased in the closing direction by its own weight and operated in the opening direction by the intake air flow.