JPS6138162A - Decompressor for internal-combustion engine - Google Patents

Decompressor for internal-combustion engine

Info

Publication number
JPS6138162A
JPS6138162A JP15809484A JP15809484A JPS6138162A JP S6138162 A JPS6138162 A JP S6138162A JP 15809484 A JP15809484 A JP 15809484A JP 15809484 A JP15809484 A JP 15809484A JP S6138162 A JPS6138162 A JP S6138162A
Authority
JP
Japan
Prior art keywords
decompression
recoil starter
cylinder
path
passage
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
Application number
JP15809484A
Other languages
Japanese (ja)
Other versions
JPH0263109B2 (en
Inventor
Masaru Yamamoto
勝 山本
Kazuhiko Takemoto
和彦 竹本
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.)
Kawasaki Heavy Industries Ltd
Original Assignee
Kawasaki Heavy Industries Ltd
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 Kawasaki Heavy Industries Ltd filed Critical Kawasaki Heavy Industries Ltd
Priority to JP15809484A priority Critical patent/JPS6138162A/en
Publication of JPS6138162A publication Critical patent/JPS6138162A/en
Publication of JPH0263109B2 publication Critical patent/JPH0263109B2/ja
Granted legal-status Critical Current

Links

Classifications

    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02NSTARTING OF COMBUSTION ENGINES; STARTING AIDS FOR SUCH ENGINES, NOT OTHERWISE PROVIDED FOR
    • F02N19/00Starting aids for combustion engines, not otherwise provided for
    • F02N19/004Aiding engine start by using decompression means or variable valve actuation
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02NSTARTING OF COMBUSTION ENGINES; STARTING AIDS FOR SUCH ENGINES, NOT OTHERWISE PROVIDED FOR
    • F02N3/00Other muscle-operated starting apparatus
    • F02N3/02Other muscle-operated starting apparatus having pull-cords

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Valve Device For Special Equipments (AREA)

Abstract

PURPOSE:To reduce the pulling force of starter by providing a decompression path coupling between intake path and cylinder while arranging a decompression valve in said path and opening said valve while interlocking with a recoil starter. CONSTITUTION:Upon pulling of handle 40 of recoil starter 14 when starting an engine, a rod 22 will move to open a decompression valve 32. Consequently, the cylinder 29 and an intake path 30 are communicated through a decompression path 26. Here, the piston 28 will never compress the mixture gas in the cylinder 29 until said path 26 is choked by the piston 28. Consequently, the compression ratio will drop considerably thus to reduce the compression force of engine. As a results, the pulling force of handle 40 of recoil starter 14 can be reduced. While the tensile force functioning onto a rope coupled to the handle 40 can also be reduced thus to prevent cutting of rope.

Description

【発明の詳細な説明】 (産業上の利用分野) 本発明は小形内燃機関の手動スタータに多用され”Cい
るリコイルスタータを備えた内燃機関のデコンプ装置に
関する。
DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a decompression device for an internal combustion engine equipped with a recoil starter, which is often used in manual starters for small internal combustion engines.

(従来技術) 従来のリコイルスタータを備えた内燃機関ではリコイル
スタータのハンドルを操作者が引張シ、ハンド〃に連結
したローブでリコイルスタータのピニオンギアを回転さ
せ、このピニオンギアの回転で内燃機関を始動するよう
になっている。
(Prior art) In an internal combustion engine equipped with a conventional recoil starter, the operator pulls the handle of the recoil starter, rotates the pinion gear of the recoil starter with a lobe connected to the hand, and the rotation of the pinion gear starts the internal combustion engine. It is set to start.

しかしながら始動時Ka丙燃根関の圧縮力に抗してリコ
イルスタータのハンドルを引張ら表ければならず、ハン
Fμの引張力が大きくて腕力の弱い婦人等では始動が国
難であるばかりか、p−プに作用する引張力でローブが
切断してしまうという問題がある。
However, when starting, the handle of the recoil starter must be pulled against the compressive force of the Kahen Fμ, and the pulling force of the Han Fμ is large, making starting not only a national disaster for women and others with weak arms. There is a problem in that the tensile force acting on the p-p causes the lobe to break.

(発明の目的) 本発明は始動時のリコイルスタータの引張力を軽減し、
小さな引張力で楽に内燃機関を蛇動することができると
ともに、リコイルスタータのローブが切断することを防
止できる内燃機関のデコンプ装置を提供することを目的
としている。
(Object of the invention) The present invention reduces the tensile force of the recoil starter at the time of starting,
It is an object of the present invention to provide a decompression device for an internal combustion engine that can easily cause the internal combustion engine to move with a small tensile force and can prevent the lobe of a recoil starter from being cut.

(発明の構成) 本発明は、始動時に移動するピニオンギアを内蔵したリ
コイルスタータを有する内燃機関において、内燃機関の
吸気通路または排気通路とシリンダとを接続したデコン
プ通路を設け、と、のデコンプ通路にデコンプ用バルブ
を介装し、前記リコイルスタータのビニオンギアの移動
に連動し始動時にデコンプ用バルブを開動作する連結部
材を設けたことを特徴とする内燃機関のデコンプ装置で
ある。
(Structure of the Invention) The present invention provides, in an internal combustion engine having a recoil starter with a built-in pinion gear that moves during starting, a decompression passage connecting an intake passage or an exhaust passage of the internal combustion engine to a cylinder. A decompression device for an internal combustion engine is provided with a decompression valve interposed therein, and a connecting member that opens the decompression valve at the time of starting in conjunction with the movement of the binion gear of the recoil starter.

(実施例) 本発明を適用した小形汎用2サイクルエンジンを示す第
1図において、2はシリンダブロックである。シリンダ
ブロック2には取付台4が形成されており、エンジン全
体を横向きに配置するようになっている。6はイグナイ
タ、8はプラグコーγ、lOは点火プラグ、12は気化
器である。
(Example) In FIG. 1 showing a small general-purpose two-stroke engine to which the present invention is applied, 2 is a cylinder block. A mounting base 4 is formed on the cylinder block 2, and the entire engine is arranged horizontally. 6 is an igniter, 8 is a plug γ, IO is a spark plug, and 12 is a carburetor.

シリンダブロック2の後端部には例えばペンディクス式
のりコイμスタータ14が設けられている。リコイルス
タータ14の側面には窓孔16が形成されておシ、窓孔
16から始動操作に伴なって前方へ移動するフリクショ
ンスプリング18の先端部20が外部に突出している。
At the rear end of the cylinder block 2, for example, a Pendix-type glue-coil μ starter 14 is provided. A window hole 16 is formed in the side surface of the recoil starter 14, and a tip portion 20 of a friction spring 18 that moves forward in response to a starting operation protrudes from the window hole 16 to the outside.

先端部20にはロッド22(連結部側)の一端が連結さ
れておシ、ロッド22の他端はアーム24に連結されて
いる。ロッド22はシリンダブロック2の側面に沿って
配置されている。
One end of a rod 22 (connection section side) is connected to the tip 20, and the other end of the rod 22 is connected to an arm 24. The rod 22 is arranged along the side surface of the cylinder block 2.

シリンダブロック2には第2図に示すようにデコンプ通
路26が形成されている。デコンプ通路26の一端はピ
ヌトン28の圧縮行程終端部に相当するシリンダ29の
内壁に開口し、他端は吸気通路80に連通している。8
1は気化器12に設けられたエアークリーナである。
A decompression passage 26 is formed in the cylinder block 2 as shown in FIG. One end of the decompression passage 26 opens into the inner wall of the cylinder 29 corresponding to the end of the compression stroke of the pinuton 28, and the other end communicates with the intake passage 80. 8
1 is an air cleaner provided in the carburetor 12.

このデコンプ通路26は略り形に屈曲して形成されてお
り、デコンプ通路26の屈曲部にはデコンプ用バルブ8
2が介装されている。デコンプ用バルブ32は第8図に
示すように円柱状を寿し中央部に形成された環状溝84
に止めねじ31の先端を嵌合させてシリンダブロック2
に回動自在に取付けられている。バルブ82flVリン
グブロック2から突出した先端部には前記アーム24が
止めねじ86で固定されておシ、ロッド22の移動によ
り回動されるようになっている。また/<μプ82の基
端部には通路38が形成されており、アーム24がロッ
ド22で第2図の2点鎖線で示す状態に押されてバルブ
82が回動した時に、通路38とデコンプ通路26とが
連通して開弁し、これ以外の状態では閉弁している。な
お、35は排気通路、37はマフラーである。
This decompression passage 26 is bent into a substantially rectangular shape, and a decompression valve 8 is provided at the bent part of the decompression passage 26.
2 is interposed. The decompression valve 32 has a cylindrical shape as shown in FIG. 8, and has an annular groove 84 formed in the center.
Fit the tip of the setscrew 31 to the cylinder block 2.
It is rotatably mounted on the The arm 24 is fixed to the tip of the valve 82fl projecting from the V-ring block 2 with a set screw 86, and is rotated by movement of the rod 22. A passage 38 is formed at the base end of the /<μ valve 82, and when the arm 24 is pushed by the rod 22 to the state shown by the two-dot chain line in FIG. The valve is opened by communicating with the decompression passage 26, and the valve is closed in other states. Note that 35 is an exhaust passage and 37 is a muffler.

リコイルスタータ14は第4図に示すように上面に突出
しだハンドル40−を有しており、フリクションスプリ
ング18の基端部42は一部を切欠いた環状に形成され
ている。リコイルスタータ14は第5図に示すように中
心軸44をシリンダブロック2に螺合して取付けられて
いる。中心軸44にはプーリ46が回転自在に設けられ
てお)、プーリ46にはハンド/l/40に連結したロ
ープ48がハンド/L’40を引張るプーリ46が矢印
R方向(第4図)に回転するように巻付けられている。
As shown in FIG. 4, the recoil starter 14 has a handle 40- projecting from its upper surface, and the base end 42 of the friction spring 18 is formed into an annular shape with a portion cut away. As shown in FIG. 5, the recoil starter 14 is attached to the cylinder block 2 by screwing the center shaft 44 thereto. A pulley 46 is rotatably provided on the central shaft 44, and a rope 48 connected to the hand/l/40 pulls the hand/L'40 in the direction of arrow R (see Fig. 4). It is wrapped so that it rotates.

プーリ46の第5図右一端面にはスパイラルスプライン
50が一体に形成されておシ、スバイラμスプライン5
0の外周にはビニオンギア52が嵌合している。ピニオ
ンギア52は圧縮コイルスプリング58でプーリ46方
向に付勢されている。tたビニオンギア52にはフリク
ションスプリング180基端部42が嵌合してお如、基
端部42の摩擦力でピニオンギア52がプーリ46と共
回シする−ことを阻止している。ハンド/I/40を引
張ってプーリ46を回転させるとピニオンギア52は基
端部42で回止めされているので、スバイラμスプライ
ン50に沿って矢印A方向に移動し、2点鎖線で示すよ
うにリングギア54に噛合ってプーリ46の回転力をリ
ングギア54に伝えてエンジンを始動する機能をはだす
A spiral spline 50 is integrally formed on the right end surface of the pulley 46 in FIG.
A pinion gear 52 is fitted to the outer periphery of 0. The pinion gear 52 is biased toward the pulley 46 by a compression coil spring 58. The proximal end portion 42 of the friction spring 180 is fitted into the pinion gear 52, which prevents the pinion gear 52 from rotating together with the pulley 46 due to the frictional force of the proximal end portion 42. When the hand/I/40 is pulled and the pulley 46 is rotated, the pinion gear 52 is stopped at the base end 42, so it moves along the Svirah μ spline 50 in the direction of arrow A, as shown by the two-dot chain line. It meshes with the ring gear 54 and transmits the rotational force of the pulley 46 to the ring gear 54 to perform the function of starting the engine.

したがってフリクションスプリング18はビニオンギア
52とともに矢印入方向に移動し、このフリクションス
プリング18の移動によって先端部20(第4図、第1
図)に連結したロッド22が前方に移動し、アーム24
の梃子作用で移動力を倍力しながら比較的小さな操作力
で回動可能なデコンプ用バ〃プ82を開動作するように
なっている。
Therefore, the friction spring 18 moves in the direction of the arrow along with the pinion gear 52, and this movement of the friction spring 18 causes the tip end 20 (FIG. 4,
The rod 22 connected to the arm 24 moves forward.
The decompression bap 82, which can be rotated with a relatively small operating force, is opened while increasing the moving force by the lever action.

次に動作を説明する。エンジンの始動時にリコイルスタ
ータ14のハンドA/40を引張ると、ピニオンギア5
2の移動に伴なってロッド22が移動し、デコンプ用バ
ルブ32が開動作する。デコンプ用バルブ32が開弁す
るとデコンプ通路26でシリンダ29と吸気通路80が
連通し、ピストン28がデコンプ通路26を閉塞するま
ではピストン28でシリンダ内の混合気を圧縮しない。
Next, the operation will be explained. When the hand A/40 of the recoil starter 14 is pulled when starting the engine, the pinion gear 5
2 moves, the rod 22 moves, and the decompression valve 32 opens. When the decompression valve 32 opens, the cylinder 29 and the intake passage 80 communicate through the decompression passage 26, and the piston 28 does not compress the air-fuel mixture in the cylinder until the piston 28 closes the decompression passage 26.

したがって圧縮比が大幅に低下しエンジンの圧縮力も著
しく減少する。圧縮力が減少すると始動時に要するクラ
ンギング力すなわちリコイルスタータ14のハンド/l
/40の引張力が大幅に軽減する。
Therefore, the compression ratio decreases significantly and the compression force of the engine also decreases significantly. When the compression force decreases, the cranking force required for starting, that is, the hand/l of the recoil starter 14
/40 tensile force is significantly reduced.

リコイルスタータ14によってエンジンが所定の回転数
で回転すると、リコイルスタータ14が元の状態に復帰
してデコンゾ用バルブ32が閉弁しても、エンジンはク
ランク軸、フライホイーμ等の慣性力で少なくとも数回
転は回転し続けることになシ、その間にニンジンが始動
する。
When the engine is rotated at a predetermined speed by the recoil starter 14, even if the recoil starter 14 returns to its original state and the deconzo valve 32 is closed, the engine will continue to rotate at least several times due to the inertia of the crankshaft, flywheel μ, etc. The rotation should continue to rotate, while the carrot starts.

(発明の効果) 以上説明したように本発明によれば、始動時に移動する
ピニオンギア52を内蔵したリコイルスタータ14を有
するエンジンにおいて、吸気通路80とシリンダ29と
を接続するデコンプ通路26を設け、このデコンプ通路
26にデコンプ用バルブ32を介装し、リコイルスター
タ14のピニオンギア52の移動に連動して始動時にデ
コンプ用バルブ32を開動作するロッド22を設けたの
で、始動時にリコイルスタータ14のハンドル40を引
張るとピニオンギア52の移動に連動してロッド22で
デコンプ用バルプ82を開動作して圧縮比を大幅に低減
し、エンジンのクヲンキングカす外わちリコイルスター
タ14のハンド/L/40の引張力を大幅に軽減できる
(Effects of the Invention) As explained above, according to the present invention, in an engine having a recoil starter 14 incorporating a pinion gear 52 that moves during startup, a decompression passage 26 connecting an intake passage 80 and a cylinder 29 is provided, A decompression valve 32 is interposed in this decompression passage 26, and a rod 22 is provided that opens the decompression valve 32 at the time of starting in conjunction with the movement of the pinion gear 52 of the recoil starter 14. When the handle 40 is pulled, the rod 22 opens the decompression valve 82 in conjunction with the movement of the pinion gear 52, significantly reducing the compression ratio and causing engine cranking. can significantly reduce the tensile force of

したがってエンジンの始動時に要するリコイルスタータ
14の引張力を軽減して腕力の弱い婦人等でも容易にエ
ンジンを始動することができるばかシか、ハンド/L’
40に連結したロー148に作用する引張力を減少させ
てロープ48が切断することを防止できる。
Therefore, it is possible to reduce the tensile force of the recoil starter 14 required to start the engine, so that even women with weak physical strength can easily start the engine.
By reducing the tensile force acting on the rope 148 connected to the rope 40, the rope 48 can be prevented from breaking.

(別の実施例) (1)デコンプ通路26はシリンダ29と吸気通路30
とを連通ずるものに限らず、シリンダ29と排気通路8
5とを連通ずるようにしてもよい。ただし、デコンプ通
路26を吸気通路80に接続した場合にはシリンダ29
内の混合気を吸気通路80KR流させるので、燃料が無
駄に消費されることは防止できるが、排気通路85に接
続した場合にはデコンプ用バルブ32の開弁時に混合気
は未燃焼のまま排出される。
(Another embodiment) (1) The decompression passage 26 is connected to the cylinder 29 and the intake passage 30.
The cylinder 29 and the exhaust passage 8 are not limited to those that communicate with each other.
5 may be communicated with each other. However, if the decompression passage 26 is connected to the intake passage 80, the cylinder 29
Since the air-fuel mixture in the intake passage 80KR flows through the intake passage, wasteful consumption of fuel can be prevented, but if it is connected to the exhaust passage 85, the air-fuel mixture will be discharged unburned when the decompression valve 32 is opened. be done.

(2)連結部材はロッド22に限らず、例えばワイヤを
利用することもできる。またロッド22は必ずしもフリ
クションヌプリング18に連結されたものに限らず、第
5図に示すようにピニオンギア52の端面に当接して移
動自在なブツシュロッド60としてもよい。
(2) The connecting member is not limited to the rod 22, and for example, a wire can also be used. Further, the rod 22 is not necessarily connected to the friction ring 18, but may be a bushing rod 60 that is movable by abutting against the end surface of the pinion gear 52, as shown in FIG.

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

第1図は本発明を適用した2サイクルエンジンの側面図
、第2図は一部を破断した第1図の1矢視子面図、第8
図は第2図の1−1断面図、第4図はリコイルスタータ
の第2図の■矢視正面図、第5図は第4図のN−マ断面
図である。14・・・リコイルスタータ、22・・・ロ
ッド(連結i材) 26・・・デコンプ通路、29・・
・シリンダ、80・・・吸気通路、82・・・デコンプ
用バpプ、84・・・通路、52…ピニオンギア
FIG. 1 is a side view of a two-stroke engine to which the present invention is applied, FIG. 2 is a partially cutaway view of FIG.
The figure is a 1-1 sectional view of FIG. 2, FIG. 4 is a front view of the recoil starter as viewed from the ■ arrow in FIG. 2, and FIG. 5 is a sectional view taken along the line N in FIG. 4. 14... Recoil starter, 22... Rod (connection I material) 26... Decompression passage, 29...
・Cylinder, 80...Intake passage, 82...Decompression valve, 84...Passage, 52...Pinion gear

Claims (1)

【特許請求の範囲】[Claims] 始動時に移動するピニオンギアを内蔵したリコイルスタ
ータを有する内燃機関において、内燃機関の吸気通路ま
たは排気通路とシリンダとを接続するデコンプ通路を設
け、このデコンプ通路にデコンプ用バルブを介装し、前
記リコイルスタータのピニオンギアの移動に連動し始動
時にデコンプ用バルブを開動作する連結部材を設けたこ
とを特徴とする内燃機関のデコンプ装置。
In an internal combustion engine having a recoil starter with a built-in pinion gear that moves during startup, a decompression passage is provided that connects the intake passage or exhaust passage of the internal combustion engine to the cylinder, and a decompression valve is interposed in this decompression passage, and the recoil A decompression device for an internal combustion engine, comprising a connecting member that opens a decompression valve at the time of starting in conjunction with movement of a pinion gear of a starter.
JP15809484A 1984-07-27 1984-07-27 Decompressor for internal-combustion engine Granted JPS6138162A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP15809484A JPS6138162A (en) 1984-07-27 1984-07-27 Decompressor for internal-combustion engine

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP15809484A JPS6138162A (en) 1984-07-27 1984-07-27 Decompressor for internal-combustion engine

Publications (2)

Publication Number Publication Date
JPS6138162A true JPS6138162A (en) 1986-02-24
JPH0263109B2 JPH0263109B2 (en) 1990-12-27

Family

ID=15664169

Family Applications (1)

Application Number Title Priority Date Filing Date
JP15809484A Granted JPS6138162A (en) 1984-07-27 1984-07-27 Decompressor for internal-combustion engine

Country Status (1)

Country Link
JP (1) JPS6138162A (en)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0395078U (en) * 1990-01-16 1991-09-27
JPH0493763U (en) * 1991-01-07 1992-08-14
US5361738A (en) * 1992-05-18 1994-11-08 Kioritz Corporation Decompression device for an engine
EP0799992A1 (en) * 1996-03-26 1997-10-08 Ishikawajima Shibaura Machinery Co., Ltd. Decompressor for an internal combustion engine
US6892688B2 (en) 2002-09-24 2005-05-17 Brp-Rotax Gmbh & Co. Kg Automatic mechanical decompressor for an internal combustion engine
JP2011033005A (en) * 2009-08-06 2011-02-17 Honda Motor Co Ltd Kick start device

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5121742U (en) * 1974-08-07 1976-02-17
JPS54141238U (en) * 1978-03-27 1979-10-01
JPS5910720A (en) * 1982-07-12 1984-01-20 Showa Kiki Kogyo Kk Starting decompression operating device and decompression type recoil starter for internal-combustion engine

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5121742B2 (en) * 1971-10-18 1976-07-05

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5121742U (en) * 1974-08-07 1976-02-17
JPS54141238U (en) * 1978-03-27 1979-10-01
JPS5910720A (en) * 1982-07-12 1984-01-20 Showa Kiki Kogyo Kk Starting decompression operating device and decompression type recoil starter for internal-combustion engine

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0395078U (en) * 1990-01-16 1991-09-27
JPH0493763U (en) * 1991-01-07 1992-08-14
US5361738A (en) * 1992-05-18 1994-11-08 Kioritz Corporation Decompression device for an engine
EP0799992A1 (en) * 1996-03-26 1997-10-08 Ishikawajima Shibaura Machinery Co., Ltd. Decompressor for an internal combustion engine
US6892688B2 (en) 2002-09-24 2005-05-17 Brp-Rotax Gmbh & Co. Kg Automatic mechanical decompressor for an internal combustion engine
JP2011033005A (en) * 2009-08-06 2011-02-17 Honda Motor Co Ltd Kick start device

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