JPS58176453A - Acceleration correcting apparatus for variable venturi carburetor - Google Patents

Acceleration correcting apparatus for variable venturi carburetor

Info

Publication number
JPS58176453A
JPS58176453A JP6063882A JP6063882A JPS58176453A JP S58176453 A JPS58176453 A JP S58176453A JP 6063882 A JP6063882 A JP 6063882A JP 6063882 A JP6063882 A JP 6063882A JP S58176453 A JPS58176453 A JP S58176453A
Authority
JP
Japan
Prior art keywords
piston valve
carburetor
valve
lever
engine speed
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
Application number
JP6063882A
Other languages
Japanese (ja)
Inventor
Kenji Shimizu
清水　研之
Kenzo Shioi
塩井　謙三
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Mikuni Corp
Original Assignee
Mikuni Corp
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Mikuni Corp filed Critical Mikuni Corp
Priority to JP6063882A priority Critical patent/JPS58176453A/en
Publication of JPS58176453A publication Critical patent/JPS58176453A/en
Pending legal-status Critical Current

Links

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M7/00—Carburettors with means for influencing, e.g. enriching or keeping constant, fuel/air ratio of charge under varying conditions
    • F02M7/12—Other installations, with moving parts, for influencing fuel/air ratio, e.g. having valves
    • F02M7/14—Other installations, with moving parts, for influencing fuel/air ratio, e.g. having valves with means for controlling cross-sectional area of fuel spray nozzle
    • F02M7/16—Other installations, with moving parts, for influencing fuel/air ratio, e.g. having valves with means for controlling cross-sectional area of fuel spray nozzle operated automatically, e.g. dependent on exhaust-gas analysis
    • F02M7/17—Other installations, with moving parts, for influencing fuel/air ratio, e.g. having valves with means for controlling cross-sectional area of fuel spray nozzle operated automatically, e.g. dependent on exhaust-gas analysis by a pneumatically adjustable piston-like element, e.g. constant depression carburettors

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Control Of The Air-Fuel Ratio Of Carburetors (AREA)

Abstract

PURPOSE:To improve the accelerting performance of a sports type motorcycle or the like at the time of shift-up of the same, by providing a restriction lever for restricting the downward movement of a piston valve according to the engine speed in a variable venturi carburetor using a piston valve. CONSTITUTION:A restriction lever 11 for a piston valve 3 is attached to the body 10 of a carburetor. The top end portion 12 of the lever 11 supports the bottom of a flange 8 of the piston valve 3 for fixing a diaphragm 4 while the other end of the lever 11 is projectd to the outside of the carburetor body 10. A linear stepping motor 15 at the top of the carburetor has a slide shaft 16, the position of which is determined by converting the engine speed into an electric signal and affording it to a control circuit 17 for energization of the motor 15. That is, when the outer end portion of the lever 11 is depressed by the slide shaft 16 against the force of a torsional spring 14, the piston valve 3 is lowered to a restriction position that is lower about 1-2mm. lower than the ordinary position. Therefore, at the time of shift-up the gears, the valve 3 is lowered by only the marginal distance of about 1-2mm., and at the time of accelertion when a throttle valve 2 is opened, air-fuel mixture is supplied at a rate determined by the opening of the throttle valve 2 without delay for waiting for the rise of the valve 3.

Description

【発明の詳細な説明】 本発明はピストン弁による可変ペンチーリー型気化器に
おける加速補正装置に関する。ピストン弁による可変ペ
ンチ＝リー型気化器は混合気絞弁の開閉に応じて作用さ
れるベンチュリ一部の負圧の昇降によってピストン弁が
上下摺動しペンチーリ一部の断面積を変化し、ペンチ＝
リー負圧をいつも一定に保持する。従って機関ミッショ
ンの切替え時には絞弁が閉じられ、ベンチュリ一部も絞
られる。故にミッション切替えのシフトアップ時１− にもベンチュリ一部が一旧絞られ、それから絞弁の開き
に順じて開かれるように々るので、それだけ加速性を阻
害している訳である。従ってこれがスポーツ用二輪車等
の場合は運転者に加速性の不足感を与えている。本発明
はこのような可変ベンチュリー型気化器において、機関
運転中のシフトアップ時においても加速性を良好にする
ことを目的とするもので、機関回転数に順応してピスト
ン弁の下降度を制限するピストン弁の下降抑制レバーを
設けるものであって、次に本発明を図面を参照して説明
する。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an acceleration correction device in a variable Pencilley type carburetor using a piston valve. The variable pliers-Lee type carburetor uses a piston valve.The piston valve slides up and down as a result of the rise and fall of negative pressure in the venturi, which is applied in response to the opening and closing of the mixture throttle valve, and changes the cross-sectional area of the venturi. =
Always maintain a constant negative pressure. Therefore, when switching engine missions, the throttle valve is closed and a portion of the venturi is also throttled. Therefore, even when the transmission is shifted up in 1-, a portion of the venturi is throttled down and then opened in accordance with the opening of the throttle valve, which impedes acceleration to that extent. Therefore, in the case of a sports motorcycle or the like, the driver feels that the acceleration is insufficient. The purpose of the present invention is to improve the acceleration performance of such a variable venturi carburetor even when upshifting during engine operation, by limiting the degree of descent of the piston valve in accordance with the engine speed. The present invention will now be described with reference to the drawings.

添付図は本発明に係る加速補正装置の一実施例を示すも
ので気化器の径断面図で示す。吸気筒１の混合気絞弁２
の上流側に設けられた可変ペンチーリー即ちピストン弁
３はその上部にダイヤフラム４を備え、該ダイヤフラム
４は上記ピストン弁３の上部に負圧室５を形成し、該負
圧室５は上記ピストン弁３にあけられた負圧連通孔６に
より、ベンチュリ一部７の負圧が作用される。９は大気
室である。この構成は従来一般のピストン弁によ２− る可変ベンチュリー型気化器のそれである。従って機関
のシフトアップ時絞弁２が一旦閉じられるとベンチュリ
一部７の空気速度がなくなり、次いで絞弁２が開かれた
時ペンチーリ一部７の空気流速が増大してピストン弁３
が上昇しζＣ供給混合気の増量を見るのであるから、絞
弁２の開きに対して機関加速は一瞬遅れを生ずる。The attached drawing shows one embodiment of the acceleration correction device according to the present invention, and is a radial cross-sectional view of a carburetor. Air-fuel mixture throttle valve 2 of intake cylinder 1
A variable pencillary or piston valve 3 provided upstream of the piston valve 3 is provided with a diaphragm 4 in its upper part, and the diaphragm 4 forms a negative pressure chamber 5 in the upper part of the piston valve 3. The negative pressure of the venturi part 7 is applied through the negative pressure communication hole 6 formed in the venturi part 3. 9 is an atmospheric chamber. This configuration is that of a conventional two-way variable venturi type carburetor using a piston valve. Therefore, when the throttle valve 2 is closed once when the engine is shifted up, the air velocity in the venturi part 7 disappears, and when the throttle valve 2 is then opened, the air flow velocity in the venturi part 7 increases and the piston valve 3
increases and the amount of ζC supplied air-fuel mixture increases, so there is a momentary delay in engine acceleration relative to the opening of the throttle valve 2.

本発明は気化器本体１０に枢支される上記ピストン弁３
の抑制レバー１１を設け、その一端は気化器内にあって
先端部１２でピストン弁３のダイヤフラムの取付は鍔部
８下部を受け、他端は気化器外に突出されるようにされ
る。１３は該抑制レバーエ１の枢軸で、該枢軸１３−に
捩シばね１４が巻回されて上記抑制レバー１１の先端部
１２を上記ピストン弁３の鍔部８から引離す方向（図の
反時計方向）に付勢している。そして気化器上部にリニ
アステッピングモータ１５を取付け、該モータ１５の摺
動軸１６の尖端が上記抑制レバー１１の気化器外先端部
に当接するようにされる。The present invention provides the above-mentioned piston valve 3 which is pivotally supported on the carburetor main body 10.
A restraining lever 11 is provided, one end of which is located inside the carburetor, and whose tip 12 receives the lower part of the flange 8 for mounting the diaphragm of the piston valve 3, and the other end is projected outside the carburetor. Reference numeral 13 denotes a pivot of the suppression lever 1, and a torsion spring 14 is wound around the pivot 13- to pull the tip 12 of the suppression lever 11 away from the flange 8 of the piston valve 3 (counterclockwise in the figure). direction). A linear stepping motor 15 is attached to the upper part of the carburetor, and the tip of the sliding shaft 16 of the motor 15 is brought into contact with the outer tip of the suppressing lever 11 of the carburetor.

上記リニアステッピングモータ１５は機関回転数を電気
信号に変換して制御回路１７に入力して励磁され、そし
て機関回転数に順じてその摺動軸１６の位置が決められ
る。即ち該摺動軸１６によって上記捩りばね１４に抗し
て抑制レバー１１の気化器外部端が押圧されるが、その
時の抑制レバー１１の大気室９内先端部１２によるピス
トン弁３の抑制位置は、通常機関運転時のベンチュＩＪ
一部７の風速によるピストン弁３の位置よシも１〜２１
下位に々るようにされる。The linear stepping motor 15 is excited by converting the engine speed into an electrical signal and inputting it to a control circuit 17, and the position of its sliding shaft 16 is determined in accordance with the engine speed. That is, the sliding shaft 16 presses the carburetor outer end of the suppression lever 11 against the torsion spring 14, but at that time, the piston valve 3 is suppressed at the suppression position by the tip 12 of the suppression lever 11 inside the atmospheric chamber 9. , Ventu IJ during normal engine operation
The position of the piston valve 3 depending on the wind speed in part 7 is also 1 to 21.
be placed in a lower rank.

上記のようにされるので、機関の通常運転時はピストン
弁３は負圧室５の負圧に応じて作動しているが、シフト
アップ時のように負圧室５の負圧は下っても機関回転数
が低下しない場合は、ピストン弁３は上記抑制レバー１
１に制限されて上記の余裕分の１〜２Ｉ下るだけである
。従って次いで絞弁２が開かれた加速時はピストン弁３
の上昇を待つ遅れ々しに、直ちに絞弁開度に応する混合
気を供給し良好加速性を得るものである。As described above, the piston valve 3 operates according to the negative pressure in the negative pressure chamber 5 during normal operation of the engine, but the negative pressure in the negative pressure chamber 5 decreases during upshifts. If the engine speed does not decrease even if the engine speed does not decrease, the piston valve 3
It is limited to 1 and is only 1 to 2I lower than the above margin. Therefore, during acceleration when the throttle valve 2 is opened, the piston valve 3
While waiting for the throttle valve to rise, it immediately supplies the air-fuel mixture corresponding to the opening of the throttle valve to obtain good acceleration.

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

添付図は本発明に係る加速補正装置の一実施例を示すも
のである。 １−ｍ−気化器吸気筒、　２−ｍ−混合気絞弁。 ３−ｍ−ピストン弁、　　　５−ｍ−負圧室。 ７−−−ペンチユリ一部、　８−ｍ−ダイヤフラム取付
は鍔部、　　　　　１１−−一抑制レノ（−２１２−ｍ
−ピストン抑制先端部。 １３−ｍ−抑制レバー枢軸。 １４−−−　ＩＪニアステッピングモータ。The attached drawing shows an embodiment of the acceleration correction device according to the present invention. 1 - m - carburetor intake cylinder, 2 - m - mixture throttle valve. 3-m-piston valve, 5-m-negative pressure chamber. 7--Part of the pendulum lily, 8-M-Diaphragm installation on the flange, 11--1 Suppression leno (-212-m
- Piston restraint tip. 13-m-Suppression lever pivot. 14--- IJ near stepping motor.

Claims (1)

【特許請求の範囲】[Claims] ピストン弁による可変ベンチ＝り一型気化器において、
上記ピストン弁を機関回転数に順応して下降度を制限す
るピストン弁の下降抑制レバーを設けたことを特徴とす
る可変ベンチュリー型気化器における加速補正装置。In variable bench = Ri-1 type carburetor with piston valve,
An acceleration correction device for a variable venturi type carburetor, characterized in that a lowering suppression lever for the piston valve is provided to limit the lowering degree of the piston valve according to the engine speed.
JP6063882A 1982-04-12 1982-04-12 Acceleration correcting apparatus for variable venturi carburetor Pending JPS58176453A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP6063882A JPS58176453A (en) 1982-04-12 1982-04-12 Acceleration correcting apparatus for variable venturi carburetor

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP6063882A JPS58176453A (en) 1982-04-12 1982-04-12 Acceleration correcting apparatus for variable venturi carburetor

Publications (1)

Publication Number Publication Date
JPS58176453A true JPS58176453A (en) 1983-10-15

Family

ID=13148053

Family Applications (1)

Application Number Title Priority Date Filing Date
JP6063882A Pending JPS58176453A (en) 1982-04-12 1982-04-12 Acceleration correcting apparatus for variable venturi carburetor

Country Status (1)

Country Link
JP (1) JPS58176453A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2011000205A1 (en) * 2009-06-28 2011-01-06 Zhang Long Carburetor with throttle standing-vortex rear fin
EP2787194B1 (en) * 2013-04-05 2018-11-14 Yamabiko Corporation Internal combustion engine

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2011000205A1 (en) * 2009-06-28 2011-01-06 Zhang Long Carburetor with throttle standing-vortex rear fin
EP2787194B1 (en) * 2013-04-05 2018-11-14 Yamabiko Corporation Internal combustion engine

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