JPS63205413A - Vertical internal combustion engine - Google Patents

Vertical internal combustion engine

Info

Publication number
JPS63205413A
JPS63205413A JP3668387A JP3668387A JPS63205413A JP S63205413 A JPS63205413 A JP S63205413A JP 3668387 A JP3668387 A JP 3668387A JP 3668387 A JP3668387 A JP 3668387A JP S63205413 A JPS63205413 A JP S63205413A
Authority
JP
Japan
Prior art keywords
valve
chamber
exhaust
exhaust valve
internal combustion
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
JP3668387A
Other languages
Japanese (ja)
Other versions
JPH0816446B2 (en
Inventor
Kiyohiko Oguri
清彦 小栗
Yoshiharu Isaka
義治 井坂
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.)
Yamaha Motor Co Ltd
Original Assignee
Yamaha Motor Co 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 Yamaha Motor Co Ltd filed Critical Yamaha Motor Co Ltd
Priority to JP62036683A priority Critical patent/JPH0816446B2/en
Priority to US07/138,313 priority patent/US4790273A/en
Priority to DE8888102392T priority patent/DE3874908T2/en
Priority to EP88102392A priority patent/EP0279446B1/en
Priority to DE88102390T priority patent/DE3883798T2/en
Priority to EP88102390A priority patent/EP0279445B1/en
Publication of JPS63205413A publication Critical patent/JPS63205413A/en
Publication of JPH0816446B2 publication Critical patent/JPH0816446B2/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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  • Valve-Gear Or Valve Arrangements (AREA)
  • Lubrication Of Internal Combustion Engines (AREA)

Abstract

PURPOSE:To improve the cooling effect of a valve driving mechanism by disposing a suction valve and an exhaust valve at the upper and the lower positions of a valve chamber, and opening an oil feeding passage to the upper side of the exhaust valve, in an engine in which the oil is fed to the valve chamber by the pressure difference between a crank case and the valve chamber. CONSTITUTION:In an OHV valve driving mechanism of a vertical internal combustion engine, in which a crank shaft 2 is arranged vertically, locker arms 29 and 32 are slided through a push rod and the like, to open and close an exhaust valve 30 and a suction valve 31. In this case, the exhaust valve 30 is disposed at the upper position of a valve chamber 37 while the suction valve 31 is at the lower position of it respectively. The valve chamber 37 is linked to a crank case 38 through a feeding passage 39 and a return passage 40 opened at the upper and the lower positions of the value chamber 37. And by utilizing the pressure variation difference between the both chambers 37 and 38 when the engine is operated, the oil is fed to the valve chamber 37 through the feeding passage 39, and sprayed to the exhaust valve 30 and the like to cool them.

Description

【発明の詳細な説明】 (産業上の利用分野) この発明はクランク軸が垂直であるバーチカル内燃機関
に関する。
DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) This invention relates to a vertical internal combustion engine in which the crankshaft is vertical.

(従来の技術) バーチカル内燃機関は、例えば芝刈機に動力源として搭
載され、その垂直のクランク軸にカッターブレードが回
転駆動可能に取付けられ、走行しつつ芝刈作業を行なう
ものがある。
(Prior Art) Some vertical internal combustion engines are mounted on, for example, lawn mowers as a power source, and have a cutter blade rotatably attached to the vertical crankshaft of the lawn mower, and perform lawn mowing work while traveling.

このようなバーチカル内燃機関には、例えば特開昭59
−179010号公報に記載されるように、カム軸の回
転でプッシュロッドを作動させ、ロッカーアームを介し
てバルブ室に配置した吸気バルブと排気バルブを開閉す
るOHV動弁機構が用いられ、比較的簡単な構造で適切
な出力を得ている。このOHV動弁機構の冷却には内燃
機関の駆動によって生じるクランク室とバルブ室との圧
力変動差によってクランク室のオイルを間欠的にバルブ
室に供給し、排気バルブ及び吸気バルブを冷却するもの
がある。
For such vertical internal combustion engines, for example, Japanese Patent Application Laid-Open No. 59
As described in Japanese Patent No. 179010, an OHV valve mechanism is used in which a push rod is actuated by rotation of a camshaft to open and close intake and exhaust valves arranged in a valve chamber via a rocker arm. Appropriate output is obtained with a simple structure. To cool the OHV valve mechanism, oil in the crank chamber is intermittently supplied to the valve chamber to cool the exhaust and intake valves based on the difference in pressure between the crank chamber and the valve chamber caused by the drive of the internal combustion engine. be.

(発明が解決しようとする問題点) ところで、この排気バルブは内燃機関の排気通路を開閉
するため、吸気通路を開閉する吸気バルブより熱の影響
が大きいか、バルブ室の下方位置に排気バルブが、上方
位置に吸気バルブか配置されている。従って、クランク
室からバルブ室に供給されるオイルは上方に配置された
吸気バルブをまず冷却し、その後下方に配置された排気
バルブを冷却することになる。この結果、排気バルブの
冷却が十分でなく、排気バルブとロッカアームとのバル
ブクリアランスが変化し、バルブタイミングが変動して
、内燃機関の出力低下の一原因となっている。
(Problem to be Solved by the Invention) By the way, since this exhaust valve opens and closes the exhaust passage of an internal combustion engine, it may be affected by heat more than the intake valve that opens and closes the intake passage, or the exhaust valve may be located below the valve chamber. , the intake valve is located in the upper position. Therefore, the oil supplied from the crank chamber to the valve chamber first cools the intake valve located above, and then cools the exhaust valve located below. As a result, the exhaust valve is not sufficiently cooled, the valve clearance between the exhaust valve and the rocker arm changes, and the valve timing fluctuates, which is one of the causes of a decrease in the output of the internal combustion engine.

この発明はこのような実情に鑑みてなされたもので、動
弁機構の冷却を効果的に行なうことが可能なバーデカル
内燃機関を提供することを目的としている。
The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a vertical internal combustion engine that can effectively cool a valve mechanism.

(問題点を解決するための手段) この発明は前記問題点を解決するために、垂直なクラン
ク軸とカム軸が連動して回転し、このカム軸でプッシュ
ロッド、ロッカアームを介してシリンダヘッドのバルブ
室に配置した排気バルブと吸気バルブとを開閉するとと
もに、前記クランク室とバルブ室との圧力変動差によっ
てクランク室のオイルが間欠的にバルブ室に供給される
バーチカル内燃機関において、前記バルブ室の下方位置
に吸気バルブが、上方位置に排気バルブがそれぞれ配置
され、前記クランク室からオイルをバルブ室へ供給する
供給通路を排気バルブの上方に開[]させたことを特徴
としている。
(Means for Solving the Problems) In order to solve the above problems, the present invention has a vertical crankshaft and a camshaft that rotate in conjunction with each other, and this camshaft controls the cylinder head via a push rod and a rocker arm. In a vertical internal combustion engine, an exhaust valve and an intake valve arranged in a valve chamber are opened and closed, and oil in the crank chamber is intermittently supplied to the valve chamber due to a pressure fluctuation difference between the crank chamber and the valve chamber. An intake valve is disposed at a lower position, and an exhaust valve is disposed at an upper position, respectively, and a supply passage for supplying oil from the crank chamber to the valve chamber is opened above the exhaust valve.

(作用) この発明では、内燃機関のクランク室から供給されるオ
イルて、まずバルブ室の上方位置に配置された排気バル
ブを冷却し、その後に下方位置に配置された吸気バルブ
を冷却する。このため、動弁機構の冷却が効果的に行な
われ、バルブクリアランスの変動が抑制され、吸気バル
ブ及び排気バルブのバルブタイミングを設定値に保持す
ることができ、出力低下が軽減される。
(Operation) In this invention, oil supplied from the crank chamber of the internal combustion engine first cools the exhaust valve located above the valve chamber, and then cools the intake valve located below. Therefore, the valve mechanism is effectively cooled, fluctuations in valve clearance are suppressed, and the valve timings of the intake valve and exhaust valve can be maintained at set values, thereby reducing a decrease in output.

(実施例) 次に、この発明の実施例を添イ」図面に基づいて詳細に
説明する。
(Example) Next, an example of the present invention will be described in detail based on the accompanying drawings.

図において符号1は例えば芝刈機に搭載されるバーチカ
ル内燃機関で、芝刈機はこのバーチカル内燃機関1の動
力で走行する。このバーチカル内燃機関1のクランク軸
2は垂直方向に配置され、その下部には図示しないハウ
ジング内に伸びてカッターブレードが取付けられ、水平
面で回転可能になっている。
In the figure, reference numeral 1 denotes a vertical internal combustion engine mounted on, for example, a lawn mower, and the lawn mower runs with the power of this vertical internal combustion engine 1. The crankshaft 2 of the vertical internal combustion engine 1 is disposed vertically, and a cutter blade is attached to the lower part of the crankshaft extending into a housing (not shown), so that the crankshaft 2 can rotate in a horizontal plane.

クランク軸2が回動可能に軸支されるクランクケース3
は縦になっており、このクランクケース3からはシリン
ダブロック4、シリンダヘッド5からなるシリンダ部6
が水平に配置されている。シリンダ部6にはピストン7
が往復動可能に設けられ、ピストン7の作動でコンロッ
ド8を介してクランク軸2を回転させる。クランク軸2
のクランクケース3から突出する上部には冷却ファン9
を有するフライホイール10が固定され、さらにクラン
クケース3やシリンダ部6の上部はファンケース11、
トップカバー12で覆われ、燃料タンク13はクランク
ケース3にステー14を介して取付けられている。
Crank case 3 in which the crankshaft 2 is rotatably supported
is vertical, and from this crankcase 3 there is a cylinder section 6 consisting of a cylinder block 4 and a cylinder head 5.
is placed horizontally. The cylinder part 6 has a piston 7
is provided to be able to reciprocate, and the operation of the piston 7 rotates the crankshaft 2 via the connecting rod 8. crankshaft 2
A cooling fan 9 is installed in the upper part protruding from the crankcase 3.
A flywheel 10 having a
Covered by a top cover 12, a fuel tank 13 is attached to the crankcase 3 via a stay 14.

排気系15を構成する排気管16はシリンダヘッド5の
上側から延出され、この排気管16にマフラ17が接続
され、一方吸気系工8を構成する吸気管19はシリンダ
ヘッド5の下側から延出され、この吸気管19に接続さ
れた気化器20はシリンダヘッド5に近接しており、エ
アクリーナ21は屈曲して気化器20の上方に配置され
ている。さらに、吸気側には点火プラグ22が外側上方
に向けて取付けられている。
An exhaust pipe 16 constituting the exhaust system 15 extends from the upper side of the cylinder head 5, and a muffler 17 is connected to this exhaust pipe 16, while an intake pipe 19 constituting the intake system 8 extends from the lower side of the cylinder head 5. A carburetor 20 extended and connected to the intake pipe 19 is close to the cylinder head 5, and an air cleaner 21 is bent and placed above the carburetor 20. Furthermore, a spark plug 22 is attached to the intake side facing outward and upward.

このバーチカル内燃機関1にはOHV動弁機構が用いら
れ、クランク軸2と平行に配置されたカム軸23のギヤ
24がクランク軸2のギヤ25と噛み合い、カム軸23
のカム部26はタペット27を介してプッシュロッド2
8と当接している。このプッシュロッド28はシリンダ
軸方向に配置され、その他端部はシリンダヘッド5に支
持されたロッカアーム29に当接し、ロッカアーム29
の作動によって排気バルブ30を開閉する。
This vertical internal combustion engine 1 uses an OHV valve mechanism, in which a gear 24 of a camshaft 23 arranged parallel to the crankshaft 2 meshes with a gear 25 of the crankshaft 2.
The cam portion 26 is connected to the push rod 2 via the tappet 27.
It is in contact with 8. This push rod 28 is arranged in the cylinder axial direction, and the other end is in contact with a rocker arm 29 supported by the cylinder head 5.
The exhaust valve 30 is opened and closed by the operation of the exhaust valve 30.

吸気バルブ31も同様にロッカアーム32の作動で開閉
されるように構成されている。
The intake valve 31 is similarly configured to be opened and closed by the operation of the rocker arm 32.

この排気バルブ30及び吸気バルブ31はそれぞれシリ
ンダヘッド5にガイド33,34を介して慴動可能に支
持され、バルブスプリング35゜36によって吸気通路
及び排気通路を閉じ方向に付勢されている。
The exhaust valve 30 and the intake valve 31 are movably supported by the cylinder head 5 via guides 33 and 34, respectively, and are biased by valve springs 35 and 36 in a direction to close the intake passage and the exhaust passage.

そして、吸気バルブ30はバルブ室37の下方に、排気
バルブ31が上方に位置しており、このバルブ室37と
クランク室38はシリンダブロック4とシリンダヘッド
5に形成された供給通路39と戻し通路40とによって
連通されている。
The intake valve 30 is located below the valve chamber 37, and the exhaust valve 31 is located above. The valve chamber 37 and the crank chamber 38 are connected to a supply passage 39 and a return passage formed in the cylinder block 4 and cylinder head 5. 40.

この供給通路39はシリンダ部6の上方位置でクランク
室38の上方からバルブ室37の上方に開口し、一方戻
し通路40はシリンダ部6の下方位置でクランク室38
の下方とバルブ室37の下方に開口している。
The supply passage 39 opens from above the crank chamber 38 to above the valve chamber 37 at a position above the cylinder part 6, while the return passage 40 opens from above the crank chamber 38 at a position below the cylinder part 6.
It opens below and below the valve chamber 37.

従って、ピストン7の作動で吸気バルブ31が開き吸気
系18から混合気が燃焼室に供給され、燃焼室で燃焼し
た燃焼ガスは排気バルブ30が開くとき、排気系15か
ら排出される。このため、排気バルブ30はこの燃焼ガ
スによって吸気バルブ31より高温となるが、ピストン
7の作動でクランク室38内に貯溜されているオイルを
オイルプランジャが攪拌し、これによって生じたオイル
飛沫がクランク室38とバルブ室37との間に生しる圧
力変動差で供給通路39からバルブ室37側に供給され
る。このオイル飛沫は間欠的に排気バルブ30の露出部
やバルブスプリング33等に吹き付けられ、これらを冷
却する。ざらに、このオイルが吸気バルブ31の露出部
やバルブスプリング35等を冷却する。
Therefore, when the piston 7 operates, the intake valve 31 opens and the air-fuel mixture is supplied from the intake system 18 to the combustion chamber, and the combustion gas burned in the combustion chamber is discharged from the exhaust system 15 when the exhaust valve 30 opens. Therefore, the exhaust valve 30 becomes hotter than the intake valve 31 due to this combustion gas, but the oil plunger stirs the oil stored in the crank chamber 38 due to the operation of the piston 7, and the resulting oil droplets are released into the crank chamber. The pressure fluctuation difference generated between the chamber 38 and the valve chamber 37 causes the oil to be supplied from the supply passage 39 to the valve chamber 37 side. This oil droplet is intermittently sprayed onto the exposed portion of the exhaust valve 30, the valve spring 33, etc., and cools them. Roughly speaking, this oil cools the exposed portion of the intake valve 31, the valve spring 35, and the like.

このように、比較的高温となる排気バルブ30側がまず
冷却され、ついで吸気バルブ31側が冷却されるため、
排気バルブ30側の冷却が効果的に行なわれ、排気バル
ブ30及び吸気バルブ31の伸縮が均等に防止される。
In this way, the exhaust valve 30 side, which has a relatively high temperature, is first cooled down, and then the intake valve 31 side is cooled down.
The exhaust valve 30 side is effectively cooled, and expansion and contraction of the exhaust valve 30 and the intake valve 31 are evenly prevented.

さらに、これらのバルブスプリング35.36は所定の
設定スブリングカが確保され、かつそのへタリが防止さ
れる。従って、排気バルブ30とロッカアーム29との
バルブクリアランス、吸気バルブ31とロッカアーム3
2とのバルブクリアランスが熱の    !影響で変動
することが抑制され、所定のバルブタイミングで内燃機
関を駆動することができる。
Furthermore, these valve springs 35, 36 ensure a predetermined setting force and are prevented from becoming sagging. Therefore, the valve clearance between the exhaust valve 30 and the rocker arm 29, the intake valve 31 and the rocker arm 3,
The valve clearance with 2 is hot! Fluctuations due to influence are suppressed, and the internal combustion engine can be driven with predetermined valve timing.

また、排気バルブ30はバルブ室37の上部に配置され
、オイル飛沫が吹き付けられるため、オイルによる冷却
に加え空気による冷却が行なわれ、一層冷却効果がある
。さらに、バルブ室37に供給されたオイルは戻し通路
40を介してクランク室38に戻されるため、吸気バル
ブ31のガイド34の間隙から燃焼室に流入することが
ないので、オイル下り等の影響なく冷却が行なわれる。
In addition, since the exhaust valve 30 is disposed at the upper part of the valve chamber 37 and is sprayed with oil droplets, cooling is performed by air in addition to oil, resulting in a further cooling effect. Furthermore, since the oil supplied to the valve chamber 37 is returned to the crank chamber 38 via the return passage 40, it does not flow into the combustion chamber through the gap between the guides 34 of the intake valves 31, so there is no influence of oil dripping, etc. Cooling takes place.

(発明の効果) 以上説明したようにこの発明では、バルブ室の下方位置
に吸気バルブが、上方位置に排気バルブがそれぞれ配置
され、クランク室からオイルをバルブ室へ供給する供給
通路を排気バルブの上方に開口させるので、内燃機関の
クランク室から供給されるオイル飛沫で、まずバルブ室
の上方位置に配置された熱の影響をより受ける排気バル
ブを冷却し、その後に下方位置に配置された吸気バルブ
を冷却するため、動弁機構の冷却が効果的に行なわれる
。従って、バルブクリアランスの変動が抑制され、吸気
バルブ及び排気バルブのバルブタイミングな設定値に保
持することができ、出力低下が軽減される。
(Effects of the Invention) As explained above, in this invention, the intake valve is arranged at the lower position of the valve chamber, and the exhaust valve is arranged at the upper position, and the supply passage for supplying oil from the crank chamber to the valve chamber is connected to the exhaust valve. Since the opening is upward, the oil droplets supplied from the crank chamber of the internal combustion engine first cool the exhaust valve, which is placed above the valve chamber and is affected by heat, and then the intake valve, which is placed below the valve chamber, is cooled. Since the valve is cooled, the valve mechanism is effectively cooled. Therefore, fluctuations in valve clearance are suppressed, the valve timings of the intake valve and exhaust valve can be maintained at appropriate set values, and a decrease in output is reduced.

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

第1図はこの発明の断面図、第2図は第1図のII −
II断面図、第3図はシリンダヘッド部の側面図である
。 図中符号1はバーチカル内燃機関、2はクランク軸、4
はシリンダヘッド、5はシリンダヘッド、6はシリンダ
部、30は排気バルブ、31は吸気バルブ、35.36
はバルブスプリング、37はバルブ室、38はクランク
室、39は吸気通路、40は戻し通路である。
FIG. 1 is a cross-sectional view of the present invention, and FIG. 2 is a cross-sectional view of FIG. 1.
II sectional view and FIG. 3 are side views of the cylinder head portion. In the figure, numeral 1 is a vertical internal combustion engine, 2 is a crankshaft, and 4 is a vertical internal combustion engine.
is the cylinder head, 5 is the cylinder head, 6 is the cylinder part, 30 is the exhaust valve, 31 is the intake valve, 35.36
37 is a valve spring, 38 is a crank chamber, 39 is an intake passage, and 40 is a return passage.

Claims (1)

【特許請求の範囲】[Claims] 垂直なクランク軸とカム軸が連動して回転し、このカム
軸でプッシュロッド、ロッカアームを介してシリンダヘ
ッドのバルブ室に配置した排気バルブと吸気バルブとを
開閉するとともに、前記クランク室とバルブ室との圧力
変動差によってクランク室のオイルが間欠的にバルブ室
に供給されるバーチカル内燃機関において、前記バルブ
室の下方位置に吸気バルブが、上方位置に排気バルブが
それぞれ配置され、前記クランク室からオイルをバルブ
室へ供給する供給通路を排気バルブの上方に開口させた
バーチカル内燃機関。
A vertical crankshaft and a camshaft rotate in conjunction, and the camshaft opens and closes the exhaust valve and intake valve located in the valve chamber of the cylinder head via the push rod and rocker arm, and also opens and closes the exhaust valve and intake valve located in the valve chamber of the cylinder head. In a vertical internal combustion engine in which oil in the crank chamber is intermittently supplied to the valve chamber due to the pressure fluctuation difference between the crank chamber and the A vertical internal combustion engine in which the supply passage that supplies oil to the valve chamber opens above the exhaust valve.
JP62036683A 1987-02-19 1987-02-19 Vertical internal combustion engine Expired - Lifetime JPH0816446B2 (en)

Priority Applications (6)

Application Number Priority Date Filing Date Title
JP62036683A JPH0816446B2 (en) 1987-02-19 1987-02-19 Vertical internal combustion engine
US07/138,313 US4790273A (en) 1987-02-19 1987-12-28 Vertical engine for walk behind lawn mower
DE8888102392T DE3874908T2 (en) 1987-02-19 1988-02-18 AIR COOLED INTERNAL COMBUSTION ENGINE.
EP88102392A EP0279446B1 (en) 1987-02-19 1988-02-18 Air cooled internal combustion engine
DE88102390T DE3883798T2 (en) 1987-02-19 1988-02-18 Vertical crankshaft internal combustion engine for lawn mowers.
EP88102390A EP0279445B1 (en) 1987-02-19 1988-02-18 Vertical engine for walk-behind lawn mower

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP62036683A JPH0816446B2 (en) 1987-02-19 1987-02-19 Vertical internal combustion engine

Publications (2)

Publication Number Publication Date
JPS63205413A true JPS63205413A (en) 1988-08-24
JPH0816446B2 JPH0816446B2 (en) 1996-02-21

Family

ID=12476636

Family Applications (1)

Application Number Title Priority Date Filing Date
JP62036683A Expired - Lifetime JPH0816446B2 (en) 1987-02-19 1987-02-19 Vertical internal combustion engine

Country Status (1)

Country Link
JP (1) JPH0816446B2 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103133074A (en) * 2011-11-30 2013-06-05 本田技研工业株式会社 Vertical-type air-cooled OHV engine

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5443205U (en) * 1977-08-31 1979-03-24
JPS6141932U (en) * 1984-08-23 1986-03-18 神鋼造機株式会社 Slipping clutch speed control device

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5443205U (en) * 1977-08-31 1979-03-24
JPS6141932U (en) * 1984-08-23 1986-03-18 神鋼造機株式会社 Slipping clutch speed control device

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103133074A (en) * 2011-11-30 2013-06-05 本田技研工业株式会社 Vertical-type air-cooled OHV engine

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JPH0816446B2 (en) 1996-02-21

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