JPS60261940A - Over-rotation preventer for 2-cycle engine - Google Patents
Over-rotation preventer for 2-cycle engineInfo
- Publication number
- JPS60261940A JPS60261940A JP11798384A JP11798384A JPS60261940A JP S60261940 A JPS60261940 A JP S60261940A JP 11798384 A JP11798384 A JP 11798384A JP 11798384 A JP11798384 A JP 11798384A JP S60261940 A JPS60261940 A JP S60261940A
- Authority
- JP
- Japan
- Prior art keywords
- throttle valve
- engine
- over
- rotation
- pressure
- 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
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D17/00—Controlling engines by cutting out individual cylinders; Rendering engines inoperative or idling
- F02D17/04—Controlling engines by cutting out individual cylinders; Rendering engines inoperative or idling rendering engines inoperative or idling, e.g. caused by abnormal conditions
-
- 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
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Control Of Throttle Valves Provided In The Intake System Or In The Exhaust System (AREA)
Abstract
Description
【発明の詳細な説明】
本発明は２サイクルエンジンの過回転によるエンジン破
損を防止する過回転防止装置に関するものである。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an overspeed prevention device for preventing engine damage due to overspeed of a two-cycle engine.
２サイクルエンジンはその特性から小排気量のエンジン
に多用されており、特にダイヤフラム屋気化器を採用す
る事により全方位運転が可能となるため、手持式或いは
背負式の携帯作東機、例えばチェンンー、刈払機等の動
力源として専用されている事は広く知られる所である。Due to its characteristics, 2-stroke engines are often used in small displacement engines, and in particular, by adopting a diaphragm carburetor, they can be operated in all directions, so they can be used in hand-held or backpack-type portable engines, such as chain engines. It is widely known that it is used exclusively as a power source for brush cutters, etc.
チェンソー、刈払機はその作業が比較的軽度、簡便であ
るため近時作業者は婦人、高齢者、若年者等未熟練者が
多数を占めている。作業上の注意としてはチェンソーは
幹枝等の切落し、刈払機では潅木、雑草等の刈払い直後
はエンジン負荷が急減する為エンジン回転力を急上昇し
過回転域に突入するので気化器絞弁を急閉してエンジン
回転の急上昇を抑える必要があるが、未熟練者の場合は
この急閉操作が遅れ勝ち或いは急閉操作をしない事もあ
り、エンジンの過回転により潤滑不足となり焼付破損を
招く事故が多い。Since the work of chainsaws and brush cutters is relatively light and simple, the majority of workers these days are women, elderly people, young people, and other unskilled workers. When working with a chainsaw, immediately after cutting off trunks, branches, etc., and with a brush cutter, immediately after cutting off shrubs, weeds, etc., the engine load decreases rapidly, causing the engine to rapidly increase rotational power and enter the overspeed range, so do not use the carburetor throttle valve. It is necessary to quickly close the valve to suppress the sudden increase in engine speed, but inexperienced people may be slow to perform this quick closing operation or may not perform the quick closing operation, resulting in insufficient lubrication due to overspeeding of the engine, resulting in seizure damage. There are many accidents.
１？ Ｋチェンンーではチェンバー長さ、刈払機ではカ
ッター径、ナイロン刃の長さ本数等の作業刃具の変動に
加え、作業地の高度、気温等の条件変動に対し気化器の
燃料計量針弁を適正に調整する事は相当の熟練経験を要
する為、例えば誤って過薄混合気に調整されている場合
には特に過回転で潤滑不足焼損によるエンジン破損 −
を招き易い。1? The fuel metering needle valve of the carburetor should be adjusted appropriately to accommodate changes in the chamber length for K chains, cutter diameter for brush cutters, length and number of nylon blades, etc., as well as changes in conditions such as the altitude and temperature of the work site. Adjustment requires considerable skill and experience, so if the mixture is incorrectly adjusted to be too lean, engine damage may occur due to lack of lubrication and burnout due to overspeeding.
easy to invite.
特に最近は低価格化、軽量化の為エンジンの構造強度も
必要最小限度である為一層過回転による破損を防止する
必要が多くなって来た。Particularly recently, due to the reduction in price and weight, the structural strength of engines has been reduced to the minimum necessary level, so it has become increasingly necessary to prevent damage due to over-speeding.
従来実用された過回転防止装置には第一の方法として、
過回転時の振動により鋼球弁が共振開弁じ別途燃料をエ
ンジンに供給し過喚混合気により回転上昇を抑制し過回
転を防止する所謂リッチダウン方式の共振弁装置がある
が過濃混合気によるため燃料消費量が多く、点火プラグ
汚損によるエンジン不調、高濃度排気ガスによる白煙臭
気による作業環境の悪化、絞弁急閉時過濃混合気による
フイドリング不調停止、気化器のラバーマウント化によ
る気化器内蔵不能等の不具合がある。The first method for over-speed prevention devices that have been used in the past is to
There is a so-called rich-down type resonant valve device in which the steel ball valve opens resonantly due to vibrations during over-revving, supplies fuel to the engine separately, suppresses the increase in engine speed by creating an over-excited mixture, and prevents over-revving. Due to this, fuel consumption is high, engine malfunctions due to fouled spark plugs, deterioration of the working environment due to white smoke odor from high concentration exhaust gas, poor idling and stoppage due to excessively rich mixture when the throttle valve is suddenly closed, and rubber mount of the carburetor. There is a problem such as the inability to build a vaporizer.
又第二の方法としては絞弁全開操作時、エンジン強制冷
却ファン風域に置いた絞弁軸先端のゝ ｌ！ＩＪ １１
ｍ ＃ Ｋ ＃、７、□−２９、。、□弁を閉方向に
回動する混合気割型方式、所謂ベーンガバナー装置もあ
るが、開架羽根にかかる風圧作動力と適正な冷却風量を
両立させる為には、通常より大型の冷却ファンが必要で
あり出力損失、重量増大等の不具合がある。The second method is when the throttle valve is fully opened, the end of the throttle valve shaft is placed in the area where the engine forced cooling fan blows. IJ 11
m#K#,7,□-29,. , □Although there is a mixed gas split type system in which the valve is rotated in the closing direction, a so-called vane governor device, in order to balance the wind pressure operating force applied to the open rack blades with the appropriate cooling air volume, a larger cooling fan than usual is required. This is necessary and causes problems such as output loss and weight increase.
本発明は過回転時、環形絞弁を閉方向に回動する作動力
として、エンジン回転に喜々比例的に増減するクランク
室脈動圧により作動する空気ポンプの吐出正圧を、過回
転時の振動により開弁する共振弁を経由して、圧力変換
装置に加圧入力し、その作動出力で絞弁全開操作のまま
環形絞弁を閉方向に回動する混合気側頭方式による、２
サイクルエンジンの過回転防止装置に関するものである
。The present invention uses the positive discharge pressure of the air pump, which is operated by the pulsating pressure in the crank chamber, which increases or decreases in proportion to the engine rotation, as the operating force to rotate the annular throttle valve in the closing direction when the engine rotates. Pressure is input to the pressure converter via a resonant valve that opens, and the operating output rotates the annular throttle valve in the closing direction while keeping the throttle valve fully open.
This invention relates to an overspeed prevention device for cycle engines.
図面について説明すると、第１図は線形絞弁全開操作で
過回転以下を示す本発明要部の機能説明縦断面図、第２
図は同様過回転時の機能説明縦断面図の主要部、第３図
は第１図ＡＡ矢視の気化器部分の縦断面図を示す。To explain the drawings, Fig. 1 is a longitudinal cross-sectional view explaining the functions of the main parts of the present invention showing over-speed or less when the linear throttle valve is fully opened;
The figure similarly shows a main part of a longitudinal sectional view explaining the function at the time of over-speeding, and FIG. 3 shows a longitudinal sectional view of the carburetor portion taken in the direction of the arrow AA in FIG. 1.
図に於て、ｌは線形絞弁式ダイヤフラム型気 ｉ化器％
２は環形絞弁、３は絞弁軸、４は絞弁レバー、５は絞弁
レバー４を全閉方向に付勢する戻しばね、６は絞弁レバ
ー４の操作桿で、図ボしていない池の一端は作業者の操
作レバーに連結される。７は料額レバーで絞弁軸３に固
着され、開架ばね８により絞弁レバー４に対し環形絞弁
２の開き方向に常時付勢され、絞弁レバー４との係支腕
により絞弁操作時一体的に回動する。In the figure, l is a linear throttle valve type diaphragm type vaporizer%
2 is an annular throttle valve, 3 is a throttle valve shaft, 4 is a throttle valve lever, 5 is a return spring that biases the throttle valve lever 4 in the fully closing direction, and 6 is an operating stick for the throttle valve lever 4, which is not shown in the figure. One end of the pond is connected to the operator's operating lever. Reference numeral 7 is a rate lever fixed to the throttle valve shaft 3, and is constantly biased against the throttle valve lever 4 in the opening direction of the annular throttle valve 2 by an opening spring 8, and the throttle valve is operated by the arm that is engaged with the throttle valve lever 4. It rotates in unison.
９は制製桿でエンジン過回転時制型レバー７を押して環
形絞弁２を閉方向に動かす。１０は絞弁軸３と絞弁レバ
ー４の回動軸部を夫々内径、外径に受ける圧入軸受であ
る。Reference numeral 9 uses a control rod to push the engine overspeed timing lever 7 to move the annular throttle valve 2 in the closing direction. Reference numeral 10 denotes a press-fit bearing that receives the rotating shaft portions of the throttle valve shaft 3 and the throttle valve lever 4 on its inner and outer diameters, respectively.
１１は図示していないエンジンクランク室の脈動圧で作
動する空気ポンプで、１２は脈動圧導入口、１３はポン
プダイヤフラム、１４は流入口、１５は吐出口で夫々一
方弁を内蔵しており、ポンプ作用による正圧空気は吐出
口１５より、共振弁１６に圧送される。１７は鋼球でエ
ンジン過回転時の振動により共振し、その加速度により
圧縮ばね１８を押上げて開弁し、空気ポンプ１１の正圧
空気は圧力変換器１９に圧送される。２０は受圧ダイヤ
フラムで制型桿９が固着され、過回転時空気ポンプ１１
の正圧空気を受圧して作動し制肥桿９により側頭レバー
７を押して環形絞弁２を閉方向に回動して混合気量を抑
制し、回転数を低減させて過回転を防止する事が出来る
。尚２１．２２は夫々圧力変換器１９のリーク孔で、出
力時、復帰時の作動を円滑にするリーク孔である。11 is an air pump operated by the pulsating pressure of the engine crank chamber (not shown); 12 is the pulsating pressure inlet; 13 is the pump diaphragm; 14 is the inlet; and 15 is the outlet, each of which has a built-in one-way valve. Positive pressure air due to the pumping action is forced to the resonance valve 16 through the discharge port 15 . Reference numeral 17 denotes a steel ball which resonates due to vibrations when the engine overspeeds, and its acceleration pushes up a compression spring 18 to open the valve, and the positive pressure air from the air pump 11 is pumped to the pressure transducer 19. 20 is a pressure receiving diaphragm to which the molding rod 9 is fixed, and the air pump 11 is
It operates by receiving positive pressure air, and the control rod 9 pushes the side lever 7 and rotates the annular throttle valve 2 in the closing direction to suppress the amount of air-fuel mixture and reduce the rotation speed to prevent over-rotation. I can do it. Reference numerals 21 and 22 are leak holes of the pressure transducer 19, which facilitate smooth operation during output and return.
本発明はこの様に構成しである為、従来の過回転防止装
置である過濃混合気の共振弁装置、或いはベーンガバナ
ー装置の様な不具合がなく確実に２サイクルニンジンの
過回転を防止出来る。Since the present invention is constructed in this way, it is possible to reliably prevent over-speed of the two-stroke engine without the problems of conventional over-speed prevention devices such as a resonant valve device for a rich mixture or a vane governor device. .
＠１回は線形絞弁全開操作で過回転以下を示す本発明要
部の機能説明縦断面図、第２図は同様過回転時の機能説
明縦断面図の主要部、第３図は第１図ＡＡ矢視の気化器
部分の縦断面図を示す。
特許出願人@1 time is a vertical cross-sectional view explaining the function of the main parts of the present invention showing over-speed or less when the linear throttle valve is fully opened, Figure 2 is a vertical cross-sectional view of the main part explaining the function at over-speed, and Figure 3 is the first A longitudinal cross-sectional view of the carburetor portion as viewed from the arrow AA in FIG. patent applicant
Claims (1)
圧空気を、エンジン過回転時の振動により共振開弁する
共振弁１６を経由して、エンジン過回転時、圧力変換器
１９１Ｃ圧送し、絞弁全開操作のまま、その出力を制製
桿９により、線形絞弁式ダイヤフラム型気化器の割型レ
バー７を押し、蝶形絞弁２を閉方向に回動する事を特徴
とする２サイクルエンジンの過回転防止装置。Positive pressure air from the pump 11, which is operated by the pulsating pressure of the engine crank chamber, is sent to the pressure transducer 191C via the resonance valve 16, which opens due to vibrations caused by the engine overspeed, to the pressure transducer 191C, and then to the throttle valve. This two-stroke engine is characterized in that, while the engine is fully open, the output is controlled by a control rod 9 that pushes a split lever 7 of a linear throttle valve type diaphragm carburetor to rotate the butterfly throttle valve 2 in the closing direction. Overspeed prevention device.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP11798384A JPS60261940A (en) | 1984-06-08 | 1984-06-08 | Over-rotation preventer for 2-cycle engine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP11798384A JPS60261940A (en) | 1984-06-08 | 1984-06-08 | Over-rotation preventer for 2-cycle engine |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS60261940A true JPS60261940A (en) | 1985-12-25 |
| JPH045810B2 JPH045810B2 (en) | 1992-02-03 |
Family
ID=14725107
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP11798384A Granted JPS60261940A (en) | 1984-06-08 | 1984-06-08 | Over-rotation preventer for 2-cycle engine |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS60261940A (en) |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0285808A2 (en) * | 1987-04-04 | 1988-10-12 | Walbro Far East, Inc. | Anti-overrunning device for an internal combustion engine |
| EP0285809A2 (en) * | 1987-04-10 | 1988-10-12 | Walbro Far East, Inc. | Anti-overrunning device for an internal combustion engine |
| EP0286818A2 (en) * | 1987-04-13 | 1988-10-19 | Walbro Far East, Inc. | Anti-overrunning device for an internal combustion engine |
| EP0289722A2 (en) * | 1987-05-06 | 1988-11-09 | Walbro Far East, Inc. | Anti-overrunning device for an internal combustion engine |
| JPS63190531U (en) * | 1987-05-28 | 1988-12-08 | ||
| US4796583A (en) * | 1987-05-06 | 1989-01-10 | Walbro Far East, Inc. | Anti-overrunning device for an internal combustion engine |
-
1984
- 1984-06-08 JP JP11798384A patent/JPS60261940A/en active Granted
Cited By (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS63248934A (en) * | 1987-04-04 | 1988-10-17 | Walbro Far East Inc | Overspeed limiting device for internal combustion engine |
| EP0285808A2 (en) * | 1987-04-04 | 1988-10-12 | Walbro Far East, Inc. | Anti-overrunning device for an internal combustion engine |
| JPH0532566B2 (en) * | 1987-04-04 | 1993-05-17 | Walbro Far East | |
| US4809657A (en) * | 1987-04-04 | 1989-03-07 | Walbro Far East, Inc. | Anti-overrunning device for an internal combustion engine |
| US4796582A (en) * | 1987-04-10 | 1989-01-10 | Walbro Far East, Inc. | Anti-overruning device for an internal combustion engine |
| EP0285809A2 (en) * | 1987-04-10 | 1988-10-12 | Walbro Far East, Inc. | Anti-overrunning device for an internal combustion engine |
| EP0286818A2 (en) * | 1987-04-13 | 1988-10-19 | Walbro Far East, Inc. | Anti-overrunning device for an internal combustion engine |
| US4809658A (en) * | 1987-04-13 | 1989-03-07 | Walbro Far East, Inc. | Anti-overrunning device for an internal combustion engine |
| US4796578A (en) * | 1987-05-06 | 1989-01-10 | Walbro Far East, Inc. | Anti-overrunning device for an internal combustion engine |
| US4796583A (en) * | 1987-05-06 | 1989-01-10 | Walbro Far East, Inc. | Anti-overrunning device for an internal combustion engine |
| JPS63277824A (en) * | 1987-05-06 | 1988-11-15 | Walbro Far East Inc | Overrun preventing device for internal combustion engine |
| EP0289722A2 (en) * | 1987-05-06 | 1988-11-09 | Walbro Far East, Inc. | Anti-overrunning device for an internal combustion engine |
| JPS63190531U (en) * | 1987-05-28 | 1988-12-08 |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH045810B2 (en) | 1992-02-03 |
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