JPH0122467B2 - - Google Patents

Info

Publication number
JPH0122467B2
JPH0122467B2 JP58115790A JP11579083A JPH0122467B2 JP H0122467 B2 JPH0122467 B2 JP H0122467B2 JP 58115790 A JP58115790 A JP 58115790A JP 11579083 A JP11579083 A JP 11579083A JP H0122467 B2 JPH0122467 B2 JP H0122467B2
Authority
JP
Japan
Prior art keywords
valve arm
intake
camshaft
arm shaft
fuel
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.)
Expired
Application number
JP58115790A
Other languages
Japanese (ja)
Other versions
JPS608462A (en
Inventor
Koichi Amemori
Toshihiko Kawabe
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.)
Yanmar Co Ltd
Original Assignee
Yanmar Diesel Engine 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 Yanmar Diesel Engine Co Ltd filed Critical Yanmar Diesel Engine Co Ltd
Priority to JP11579083A priority Critical patent/JPS608462A/en
Priority to SE8306263A priority patent/SE458048B/en
Priority to GB08331009A priority patent/GB2141780B/en
Priority to US06/553,897 priority patent/US4538561A/en
Priority to FR8318540A priority patent/FR2547627B1/fr
Priority to IT8324113A priority patent/IT1167687B/en
Priority to AU23030/84A priority patent/AU2303084A/en
Priority to IN21/MAS/84A priority patent/IN159241B/en
Priority to DE19843403663 priority patent/DE3403663A1/en
Priority to KR1019840000595A priority patent/KR920000787B1/en
Publication of JPS608462A publication Critical patent/JPS608462A/en
Priority to MYPI88000300A priority patent/MY103247A/en
Priority to HK704/88A priority patent/HK70488A/en
Publication of JPH0122467B2 publication Critical patent/JPH0122467B2/ja
Granted legal-status Critical Current

Links

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01L—CYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
    • F01L1/00—Valve-gear or valve arrangements, e.g. lift-valve gear
    • F01L1/20—Adjusting or compensating clearance
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01L—CYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
    • F01L1/00—Valve-gear or valve arrangements, e.g. lift-valve gear
    • F01L1/02—Valve drive
    • F01L1/04—Valve drive by means of cams, camshafts, cam discs, eccentrics or the like
    • F01L1/047—Camshafts
    • F01L1/053—Camshafts overhead type
    • 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
    • F02B2275/00—Other engines, components or details, not provided for in other groups of this subclass
    • F02B2275/20—SOHC [Single overhead camshaft]
    • 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
    • F02B3/00—Engines characterised by air compression and subsequent fuel addition
    • F02B3/06—Engines characterised by air compression and subsequent fuel addition with compression ignition

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Valve-Gear Or Valve Arrangements (AREA)
  • Cylinder Crankcases Of Internal Combustion Engines (AREA)
  • Fuel-Injection Apparatus (AREA)

Description

【発明の詳細な説明】 本発明はシリンダヘツドにユニツトインジエク
タを装着したオーバヘツドカム式デイーゼル機関
に関するものである。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an overhead cam type diesel engine in which a unit injector is mounted on the cylinder head.

従来、船外機等に使用されるデイーゼル機関は
その外形をコンパクトに、かつ軽量にまとめる必
要から、シリンダヘツドにユニツトインジエクタ
を装着したオーバヘツドカム式のものが得策であ
る。この場合、シリンダヘツドの上部に設けられ
た弁腕室内にカム軸及びそのカム軸により駆動さ
れユニツトインジエクタを駆動する燃料弁腕の弁
腕軸、更にはそのカム軸により駆動され、吸排気
弁を駆動する吸排気弁腕の弁腕軸がそれぞれ平行
に設けられることになると共に、各弁腕軸に各気
筒ごとの燃料弁腕及び排気弁腕がとりつけられる
ことになる。 Conventionally, diesel engines used in outboard motors and the like need to be compact and lightweight, so it is advisable to use an overhead cam type engine with a unit injector attached to the cylinder head. In this case, there is a camshaft in the valve arm chamber provided at the top of the cylinder head, a valve arm shaft of the fuel valve arm that is driven by the camshaft and drives the unit injector, and a valve arm shaft that is further driven by the camshaft to drive the intake and exhaust valves. The valve arm axes of the intake and exhaust valve arms that drive the cylinders are arranged parallel to each other, and the fuel valve arm and exhaust valve arm for each cylinder are attached to each valve arm axis.

このようなデイーゼル機関においては、ユニツ
トインジエクタを適宜な角度で傾斜させて設けて
いるが、一般に吸排気弁の高さをユニツトインジ
エクタの全体の高さよりも低くしているのが通常
である。 In such diesel engines, the unit injector is tilted at an appropriate angle, but the height of the intake and exhaust valves is generally lower than the overall height of the unit injector. .

一方、吸排気弁腕の吸排気弁との接触部には、
吸排気弁の調整ねじが設けてあり、この調整ねじ
をその上部からドライバーでまわして調整した
後、ナツトをスパナ等でまわして固定する方法を
とる必要がある。 On the other hand, at the contact part of the intake and exhaust valve arm with the intake and exhaust valve,
There is an adjustment screw for the intake and exhaust valves, and after adjusting the adjustment screw by turning it from the top with a screwdriver, it is necessary to tighten it by turning the nut with a spanner or the like.

更に、上記カム軸、燃料弁腕の弁腕軸及び吸排
気弁腕の弁腕軸の各々の平行度を保持することが
必要であり、組付時に平行度が保たれていない
と、それぞれの接当部の片当りによりその寿命が
著しく低下するという問題があり、これらの各軸
がそれぞれ別個の支え台に支持されている場合に
は、その組付け時間と工数とがかさむという問題
がある。 Furthermore, it is necessary to maintain the parallelism of the camshaft, the valve arm axis of the fuel valve arm, and the valve arm axis of the intake/exhaust valve arm, and if the parallelism is not maintained during assembly, each There is a problem that the life of the abutment is significantly reduced due to uneven contact of the abutment part, and if each of these axes is supported on a separate support stand, there is a problem that the assembly time and man-hours increase. .

そこで、本発明は前記のごとく１本のカム軸で
各気筒の吸排気弁及びユニツトインジエクタを駆
動する内燃機関において、吸排気弁の弁隙間調整
をカム軸と燃料弁腕軸の間から工具を挿入して外
部から容易にすることができるオーバヘツドカム
式デイーゼル機関を提供することを目的とし、更
に、これらカム軸と燃料弁腕軸及び吸排気弁腕軸
とを同一の支え台に支持することによりこれらの
平行度を保持することのできる機関の提供を目的
としてなされたものである。 Therefore, in an internal combustion engine in which a single camshaft drives the intake and exhaust valves and unit injector of each cylinder as described above, the present invention provides a tool to adjust the valve clearance of the intake and exhaust valves from between the camshaft and the fuel valve arm shaft. The object of the present invention is to provide an overhead cam type diesel engine that can be easily inserted from the outside, and further to support these camshafts, a fuel valve arm shaft, and an intake/exhaust valve arm shaft on the same support base. This was done for the purpose of providing an organization that can maintain these parallelisms.

即ち、本発明のオーバヘツドカム式デイーゼル
機関は、シリンダヘツドにユニツトインジエクタ
を装着したオーバヘツドカム式デイーゼル機関に
おいて、カム軸を吸排気弁腕の調整ねじより上方
に配設すると共に、該カム軸を該ユニツトインジ
エクタ駆動用の燃料弁腕のローラよりも下方に配
設し、前記調整ねじをカム軸と燃料弁腕軸の間に
位置させたことを特徴としたものであり、更にそ
のオーバヘツドカム式デイーゼル機関のカム軸、
燃料弁腕の弁腕軸及び吸排気弁腕の弁腕軸を同一
の支え台に支持した構成を特徴とするものであ
る。 That is, the overhead cam type diesel engine of the present invention is an overhead cam type diesel engine in which a unit injector is attached to the cylinder head. The fuel valve arm is disposed below the roller of the fuel valve arm for driving the injector, and the adjustment screw is located between the camshaft and the fuel valve arm shaft, and the overhead cam type diesel engine camshaft,
The valve arm shaft of the fuel valve arm and the valve arm shaft of the intake/exhaust valve arm are supported on the same support base.

以下、図面を参照して本発明の一実施例を説明
するが、第１図は本発明の実施例におけるオーバ
ヘツドカム式デイーゼル機関の平断面図、第２図
は第１図の弁腕室側から見た側面図である。 Hereinafter, one embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a plan cross-sectional view of an overhead cam type diesel engine according to the embodiment of the present invention, and FIG. 2 is a view taken from the valve arm chamber side of FIG. 1. FIG.

まず、このデイーゼル機関は船外機等に搭載さ
れる垂直クランク軸型のものであり、シリンダヘ
ツド１１にユニツトインジエクタ６を傾斜して装
着し、そのシリンダヘツド１１の上部の弁腕室１
２内にカム軸１を設けたオーバヘツドカム式のデ
イーゼル機関である。 First, this diesel engine is of the vertical crankshaft type mounted on an outboard motor, etc., and the unit injector 6 is installed at an angle on the cylinder head 11.
This is an overhead cam type diesel engine with a camshaft 1 installed inside the engine.

このカム軸１にはユニツトインジエクタ６駆動
用の燃料カムと吸排気弁８駆動用の吸排気カムと
が同じ軸上に設けられており、このカム軸１と平
行に燃料弁腕軸５及び吸排気弁腕軸３が設けら
れ、これらカム軸１、燃料弁腕軸５及び吸排気弁
腕軸３はいずれも同一の支え台１３によりシリン
ダヘツド１１に支持されている。なお、この支え
台１３を弁腕室１２を構成する部材１８と一体に
形成してもよい。 On this camshaft 1, a fuel cam for driving a unit injector 6 and an intake/exhaust cam for driving an intake/exhaust valve 8 are provided on the same axis, and a fuel valve arm shaft 5 and a fuel valve arm shaft 5 and An intake/exhaust valve arm shaft 3 is provided, and the camshaft 1, the fuel valve arm shaft 5, and the intake/exhaust valve arm shaft 3 are all supported on the cylinder head 11 by the same support base 13. Note that this support stand 13 may be formed integrally with the member 18 that constitutes the valve arm chamber 12.

次に、この燃料弁腕軸５により支持された燃料
弁腕４の一端部に設けたローラ１０は、カム軸１
の燃料カムに上方から接触しながら回転すること
により、燃料弁腕４が揺動してその他端部でユニ
ツトインジエクタ６のプランジヤを上下に往復さ
せて駆動するようになつている。 Next, a roller 10 provided at one end of the fuel valve arm 4 supported by the fuel valve arm shaft 5 is moved around the camshaft 1.
By rotating while contacting the fuel cam from above, the fuel valve arm 4 swings, and the plunger of the unit injector 6 is driven to reciprocate up and down at the other end.

また、カム軸１の吸排気カムの下方は吸排気弁
腕軸３に支持された吸排気弁腕２に設けられた摺
動用パツト９に接触し、吸排気弁腕２を揺動させ
ることにより吸排気弁８の開閉を行なうようにな
つており、この場合、吸排気弁腕２の吸排気弁８
との接当部には弁隙間調整用の調整ねじ７及びナ
ツト１５がカム軸１と燃料弁腕軸５の間に配設さ
れている。 Further, the lower part of the intake/exhaust cam of the camshaft 1 contacts a sliding part 9 provided on the intake/exhaust valve arm 2 supported by the intake/exhaust valve arm shaft 3, and by swinging the intake/exhaust valve arm 2, The intake and exhaust valve 8 is opened and closed, and in this case, the intake and exhaust valve 8 of the intake and exhaust valve arm 2 is opened and closed.
An adjustment screw 7 and a nut 15 for adjusting the valve clearance are disposed between the camshaft 1 and the fuel valve arm shaft 5 at the abutting portion thereof.

従つて、上記のカム軸１は、吸排気弁腕２の調
整ねじ７及びナツト１５より上方に位置すると共
に、燃料弁腕４のローラ１０よりも下方に位置し
て配設されている。 Therefore, the camshaft 1 is located above the adjusting screw 7 and nut 15 of the intake/exhaust valve arm 2 and below the roller 10 of the fuel valve arm 4.

以上の構成からなるデイーゼル機関において
は、第２図に示すごとく多気筒機関においても、
１本のカム軸１でそれぞれ駆動される各１本の吸
排気弁腕軸３及び燃料弁腕軸５により各気筒の吸
排気弁腕２及び燃料弁腕４を駆動でき、その弁腕
室１２内を非常にコンパクトにまとめることがで
きると共に、部品点数を軽減することができる。 In a diesel engine with the above configuration, even in a multi-cylinder engine as shown in Figure 2,
The intake/exhaust valve arm 2 and fuel valve arm 4 of each cylinder can be driven by one intake/exhaust valve arm shaft 3 and one fuel valve arm shaft 5 each driven by one camshaft 1, and the valve arm chamber 12 of each cylinder can be driven. The interior can be made very compact and the number of parts can be reduced.

そこで、上記吸排気弁８の弁隙間調整を行なう
際には、第２図に示す調整ねじ７の頭部のマイナ
ス形溝にドライバーの先端を真上から挿入して、
調整ねじ７をまわしながら調整を行なうのである
が、この場合、ドライバーなどの工具は弁腕軸５
とカム軸１の間を通つて挿入されるため、調整作
業は外部から極めて容易に行なうことができる。
また、調整の前後のナツト１５の緩め及び締付け
は、燃料弁腕軸５の下部にスパナ等を矢印Ｘ方向
から挿入して行なうことが容易にできる。又は上
方より中空スパナでナツトを回転させその中に調
整ねじ回転用ドライバーを入れる事によつても調
整及びロツクが可能である。 Therefore, when adjusting the valve clearance of the intake/exhaust valve 8, insert the tip of a screwdriver from directly above into the minus-shaped groove in the head of the adjustment screw 7 shown in FIG.
Adjustments are made by turning the adjustment screw 7, but in this case, a tool such as a screwdriver must be attached to the valve arm shaft 5.
Since the camshaft 1 is inserted between the camshaft 1 and the camshaft 1, adjustment work can be carried out extremely easily from the outside.
Further, the nut 15 can be easily loosened and tightened before and after adjustment by inserting a spanner or the like into the lower part of the fuel valve arm shaft 5 from the direction of the arrow X. Alternatively, adjustment and locking can also be made by rotating the nut with a hollow spanner from above and inserting a screwdriver for rotating the adjustment screw into it.

また、上記のごとく各１本の吸排気弁腕軸３及
び燃料弁腕軸５内を中空にして、その中空部内を
潤滑油通路として利用すれば、各気筒の吸排気弁
腕２及び燃料弁腕４のカム軸１の各カム面との接
触部分などを有効に潤滑することもできる。 Furthermore, if the inside of each intake/exhaust valve arm shaft 3 and fuel valve arm shaft 5 is made hollow as described above and the inside of the hollow portion is used as a lubricating oil passage, the intake/exhaust valve arm 2 and fuel valve of each cylinder can be It is also possible to effectively lubricate the contact portions of the arm 4 with each cam surface of the camshaft 1.

また、上記カム軸１、吸排気弁腕軸３及び燃料
弁腕軸５はいずれも同一の支え台１３により平行
に支持されるので、これら各軸穴の加工時の平行
度を確保すれば、組付時の平行度維持が容易であ
る。 Furthermore, since the camshaft 1, intake/exhaust valve arm shaft 3, and fuel valve arm shaft 5 are all supported in parallel by the same support base 13, if the parallelism of these shaft holes is ensured during machining, It is easy to maintain parallelism during assembly.

なお、本実施例では、第１図に示すごとく吸排
気弁腕２の一部にアーム１６が設けられ、このア
ーム１６にデコンプ装置１７を接続可能にしてい
る。 In this embodiment, as shown in FIG. 1, an arm 16 is provided on a part of the intake/exhaust valve arm 2, and a decompression device 17 can be connected to this arm 16.

従つて、本発明のオーバーヘツドカム式デイー
ゼル機関では、１本のカム軸で駆動される各１本
の吸排気弁腕軸及び燃料弁腕軸で各気筒の吸排気
弁及びユニツトインジエクタを駆動可能であり、
その弁腕室内をコンパクト形成すると共に、その
部品点数を低減できるという利点がありながら、
その吸排気弁の弁隙間調整も容易に行ないうると
いう利点もある。 Therefore, in the overhead cam type diesel engine of the present invention, the intake and exhaust valves and unit injector of each cylinder are driven by one intake and exhaust valve arm shaft and one fuel valve arm shaft each driven by one camshaft. It is possible and
Although it has the advantage of making the valve arm chamber compact and reducing the number of parts,
Another advantage is that the valve clearance of the intake and exhaust valves can be easily adjusted.

更に、これらカム軸、燃料弁腕軸及び吸排気弁
腕軸との間の平行度を容易に確保でき、組付け工
数の低減をはかると共に、各弁腕の接当部の片当
り摩耗の低減をはかることができるという利点も
ある。 Furthermore, parallelism between the camshaft, fuel valve arm shaft, and intake/exhaust valve arm shaft can be easily ensured, reducing assembly man-hours and reducing wear due to one-sided contact of the contact portion of each valve arm. It also has the advantage of being able to measure

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

第１図は本発明の実施例におけるオーバヘツド
カム式デイーゼル機関の平断面図、第２図は第１
図の弁腕室側から見た側面図である。 １……カム軸、２……吸排気弁腕、３……吸排
気弁腕軸、４……燃料弁腕、５……燃料弁腕軸、
６……ユニツトインジエクタ、７……調整ねじ、
１１……シリンダヘツド、１３……支え台。 FIG. 1 is a plan sectional view of an overhead cam type diesel engine according to an embodiment of the present invention, and FIG.
It is a side view seen from the valve arm chamber side of a figure. 1...Cam shaft, 2...Intake/exhaust valve arm, 3...Intake/exhaust valve arm shaft, 4...Fuel valve arm, 5...Fuel valve arm shaft,
6...Unit injector, 7...Adjustment screw,
11...Cylinder head, 13...Support stand.

Claims (1)

【特許請求の範囲】 １ シリンダヘツドにユニツトインジエクタを装
着したオーバヘツドカム式デイーゼル機関におい
て、カム軸を吸排気弁腕の調整ねじより上方に配
設すると共に、該カム軸を該ユニツトインジエク
タ駆動用の燃料弁腕のローラよりも下方に配設
し、前記調整ねじをカム軸と燃料弁腕軸の間に位
置させたことを特徴とするオーバヘツドカム式デ
イーゼル機関。 ２ カム軸、燃料弁腕の弁腕軸及び吸排気弁腕の
弁腕軸が同一の支え台に支持されている特許請求
の範囲第１項記載のオーバヘツドカム式デイーゼ
ル機関。[Scope of Claims] 1. In an overhead cam type diesel engine in which a unit injector is attached to the cylinder head, a camshaft is disposed above an adjustment screw of an intake/exhaust valve arm, and the camshaft is used to drive the unit injector. An overhead cam type diesel engine, characterized in that the adjusting screw is disposed below the roller of the fuel valve arm, and the adjusting screw is located between the camshaft and the fuel valve arm shaft. 2. The overhead cam type diesel engine according to claim 1, wherein the camshaft, the valve arm shaft of the fuel valve arm, and the valve arm shaft of the intake/exhaust valve arm are supported on the same support base.
JP11579083A 1983-06-20 1983-06-29 Overhead cam type diesel engine Granted JPS608462A (en)

Priority Applications (12)

Application Number Priority Date Filing Date Title
JP11579083A JPS608462A (en) 1983-06-29 1983-06-29 Overhead cam type diesel engine
SE8306263A SE458048B (en) 1983-06-20 1983-11-15 VIP-PARK CHAMBER DEVICE IN A DIESEL ENGINE
GB08331009A GB2141780B (en) 1983-06-20 1983-11-21 Mounting the camshaft and rocker shafts in a diesel engine
US06/553,897 US4538561A (en) 1983-06-20 1983-11-21 Valve arm chamber apparatus for diesel engine
FR8318540A FR2547627B1 (en) 1983-06-20 1983-11-22
IT8324113A IT1167687B (en) 1983-06-20 1983-12-12 CHAMBER APPARATUS FOR VALVE ARMS FOR DIESEL ENGINE
AU23030/84A AU2303084A (en) 1983-06-20 1984-01-03 Overhead camshaft apparatus
IN21/MAS/84A IN159241B (en) 1983-06-20 1984-01-13
DE19843403663 DE3403663A1 (en) 1983-06-20 1984-02-03 DEVICE WITH VALVE ARM CHAMBER FOR DIESEL ENGINES
KR1019840000595A KR920000787B1 (en) 1983-06-20 1984-02-08 Valve arm chamber apparatus for diesel engine
MYPI88000300A MY103247A (en) 1983-06-20 1988-03-23 Valve arm chamber apparatus for a diesel engine
HK704/88A HK70488A (en) 1983-06-20 1988-09-08 Valve arm chamber apparatus for a diesel engine

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP11579083A JPS608462A (en) 1983-06-29 1983-06-29 Overhead cam type diesel engine

Publications (2)

Publication Number Publication Date
JPS608462A JPS608462A (en) 1985-01-17
JPH0122467B2 true JPH0122467B2 (en) 1989-04-26

Family

ID=14671130

Family Applications (1)

Application Number Title Priority Date Filing Date
JP11579083A Granted JPS608462A (en) 1983-06-20 1983-06-29 Overhead cam type diesel engine

Country Status (1)

Country Link
JP (1) JPS608462A (en)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AT391165B (en) * 1984-05-22 1990-08-27 Steyr Daimler Puch Ag CAM DRIVE FOR AN AIR COMPRESSING, SELF-IGNITIONING PISTON PISTON COMBUSTION ENGINE
JPS62159762A (en) * 1986-01-08 1987-07-15 Honda Motor Co Ltd diesel engine

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6341573Y2 (en) * 1980-12-25 1988-11-01

Also Published As

Publication number Publication date
JPS608462A (en) 1985-01-17

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