JPS63195305A - Cam shaft driving mechanism of engine for motor-bicycle - Google Patents

Cam shaft driving mechanism of engine for motor-bicycle

Info

Publication number
JPS63195305A
JPS63195305A JP2464887A JP2464887A JPS63195305A JP S63195305 A JPS63195305 A JP S63195305A JP 2464887 A JP2464887 A JP 2464887A JP 2464887 A JP2464887 A JP 2464887A JP S63195305 A JPS63195305 A JP S63195305A
Authority
JP
Japan
Prior art keywords
cylinder
crankshaft
cam
chain
cam chain
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
JP2464887A
Other languages
Japanese (ja)
Other versions
JPH0814255B2 (en
Inventor
Kengo Nishi
賢悟 西
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 JP62024648A priority Critical patent/JPH0814255B2/en
Publication of JPS63195305A publication Critical patent/JPS63195305A/en
Publication of JPH0814255B2 publication Critical patent/JPH0814255B2/en
Anticipated expiration legal-status Critical
Expired - Fee Related 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
    • F01L1/02—Valve drive
    • F01L1/022—Chain drive
    • 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
    • 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
    • F02B75/16—Engines characterised by number of cylinders, e.g. single-cylinder engines
    • 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
    • F01L1/024—Belt drive
    • 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
    • F01L1/026—Gear drive
    • 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
    • F02B2075/027—Engines characterised by their cycles, e.g. six-stroke having less than six strokes per cycle four
    • 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
    • F02B2275/08—Endless member is a chain
    • 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
    • F02B61/00—Adaptations of engines for driving vehicles or for driving propellers; Combinations of engines with gearing
    • F02B61/02—Adaptations of engines for driving vehicles or for driving propellers; Combinations of engines with gearing for driving cycles

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Valve-Gear Or Valve Arrangements (AREA)

Abstract

PURPOSE:To make a cam shaft driving device compact by connecting a balancer shaft to a cam shaft through a cam chain moving obliquely in the axial direction of a cylinder, and arranging a chain tension adjusting device in a space for the cam chain on a side near the cylinder. CONSTITUTION:A balancer shaft 8 is provided above a middle area between a speed change gear 6 and a crankshaft 4. The balancer shaft 8 is connected to a cam shaft 18 through a cam chain 16 moving obliquely in the axial direction of a cylinder 1. A chain tension adjusting device 18 is arranged in a space 17 for the cam chain 16 on a side near the cylinder 1. A cam shaft driving device can thereby be made wholly compact.

Description

【発明の詳細な説明】 〔発明の技術分野〕 本発明は自動二輪車用４サイクルエンジンのカム軸駆動
機構に関するものである。DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to a camshaft drive mechanism for a four-stroke engine for a motorcycle.

〔従来技術〕[Prior art]

自動二輪車に搭載される高速用４サイクルエンジンでは
、高速回転での吸排気弁の作動を確実にするため、シリ
ンダ頭部にカム軸を配置し、このカム軸により吸排気弁
を直接またはロッカーアームを介して駆動するようにし
ており、そのカム軸はクランク軸からカムチェンを介し
て動力を入力するようになっている。このカム軸駆動機
構では、カムチェンがエンジンの回転変動により撓んだ
り、伸びて弛んだりすると吸排気弁の作動や点火時期に
狂いを生じ、エンジンの出力低下などの不調をきたすよ
うになる。このようなカムチェンの撓みや伸びはチェノ
。張力調整装置によって調整することができるが、これ
を一層確実なものにするにはカムチェンの長さを短くす
るようにした方が望ましい。In high-speed 4-stroke engines installed in motorcycles, in order to ensure the operation of the intake and exhaust valves at high speeds, a camshaft is placed in the cylinder head. The camshaft receives power from the crankshaft through a cam chain. In this camshaft drive mechanism, if the cam chain bends or stretches and loosens due to fluctuations in engine rotation, the operation of the intake and exhaust valves and the ignition timing will be out of order, resulting in malfunctions such as a drop in engine output. This kind of bending and stretching of kamchen is called cheno. This can be adjusted using a tension adjustment device, but in order to make this more reliable, it is preferable to shorten the length of the cam chain.

従来、このようにカムチェンの長さを短くするものとし
て、クランク軸から直接動力を入力するようにせず、ク
ランク軸よりもカム軸に近い位置に、そのクランク軸に
よう駆動される中間軸を配置し、この中間軸とカム軸と
の間をカムチエンで連結するようにしたものが提案され
ている（特開昭５６−８３５０７号公報に参照）。Conventionally, in order to shorten the length of the cam chain, instead of inputting power directly from the crankshaft, an intermediate shaft driven by the crankshaft was placed closer to the camshaft than the crankshaft. However, it has been proposed to connect the intermediate shaft and the camshaft with a cam chain (see Japanese Patent Laid-Open No. 83507/1983).

しかし、この中間軸のように特別の部品を増設すること
は、それだけ部品点数を増加することになり、組立工数
の増加によるコストアップや、重量増加を招くことにな
る。また、中間軸を配置するために余分なスペースが必
要になるため大型化を招き、自動二輪車のように設置空
間の制約された車両では好ましくない。However, adding special parts such as the intermediate shaft increases the number of parts accordingly, leading to increased costs and weight due to increased assembly man-hours. Further, extra space is required to arrange the intermediate shaft, which results in an increase in size, which is not preferable for vehicles with limited installation space, such as motorcycles.

〔発明の目的〕[Purpose of the invention]

本発明の目的は、余分の部品を増設することなくカムチ
ェンを短縮し、機構をコンパクトにすることができる自
動二輪車用エンジンのカム軸駆動機構を提供することに
ある。An object of the present invention is to provide a camshaft drive mechanism for a motorcycle engine that allows the cam chain to be shortened and the mechanism to be made compact without adding any extra parts.

〔発明の構成〕[Structure of the invention]

上記目的を達成する本発明は、シリンダの下方にクラン
ク軸を配置し、このクランク軸の後方に変速機を配置し
、この変速機とクランク軸との中間域上方にクランク軸
と連動するバランサ軸を配置し、かつシリンダ頭部に動
弁用のカム軸を配置した自動二輪車用４サイクルエンジ
ンにおいて、前記バランサ軸とカム軸とをシリンダの軸
方向に斜行するカムチェンで連結し、このカムチェンの
シリンダ寄り側の空間にチェノ張力調整装置を配置した
ことを特徴とするものである。The present invention achieves the above object by disposing a crankshaft below the cylinder, disposing a transmission behind the crankshaft, and disposing a balancer shaft interlocking with the crankshaft above an intermediate region between the transmission and the crankshaft. In a four-stroke motorcycle engine in which a camshaft for a valve train is disposed in the cylinder head, the balancer shaft and the camshaft are connected by a cam chain that runs diagonally in the axial direction of the cylinder, and the cam chain is connected to the camshaft. It is characterized in that a tension adjustment device is placed in the space on the side closer to the cylinder.

以下、本発明を図に示す実施例により説明する。The present invention will be explained below with reference to embodiments shown in the drawings.

第１〜３図は、本発明の実施例からなる自動二輪車用４
サイクルエンジンであり、矢印Ｆで示す方向を進行方向
にして搭載される。このエンジンにおいて、１は上下方
向にや１斜めに延びるシリンダ、２はそのシリンダ１上
部に取り付けられたシリンダ頭部、３はシリンダｌの下
部に取り付けられたクランクケースである。Figures 1 to 3 show a four-wheeled motor vehicle according to an embodiment of the present invention.
It is a cycle engine and is mounted with the direction shown by arrow F as the direction of travel. In this engine, 1 is a cylinder extending slightly diagonally in the vertical direction, 2 is a cylinder head attached to the upper part of the cylinder 1, and 3 is a crankcase attached to the lower part of the cylinder 1.

クランクケース３にはクランク軸４が設けられ、シリン
ダ１を往復動するピストン５によって駆動されるように
なっている。このクランク軸４の後方には変速機６が設
けられ、この変速機６により減速された動力をチェノ７
を介して図示しない後輪に伝達するようになっている。A crankshaft 4 is provided in the crankcase 3 and is driven by a piston 5 that reciprocates in the cylinder 1. A transmission 6 is provided behind this crankshaft 4, and the power decelerated by this transmission 6 is transferred to a cheno 7.
The signal is transmitted to the rear wheels (not shown) via the .

また、クランク軸４と変速機６との中間部上方には、歯
車９．１０を介してクランク軸４と連動するようにした
バランサ軸８が設置され、クランク軸の回転を円滑にす
るようにしている。Further, a balancer shaft 8 is installed above the intermediate portion between the crankshaft 4 and the transmission 6, and is interlocked with the crankshaft 4 through gears 9 and 10 to ensure smooth rotation of the crankshaft. ing.

一方、シリンダ頭部２には吸気弁１１と排気弁１２が設
けられ、かつこの吸排気弁を駆動するカム軸１３が設け
られている。On the other hand, the cylinder head 2 is provided with an intake valve 11 and an exhaust valve 12, and a camshaft 13 for driving the intake and exhaust valves.

上記カム軸１３はシリンダ１より側方に突出させた軸端
にスプロケッ）１４を設けている。The camshaft 13 is provided with a sprocket 14 at the end of the shaft that projects laterally from the cylinder 1.

一方、上記バランサ軸８にはスプロケット１５が取り付
けられ、このスプロケット１５と上記スプロケット１４
との間にカムチェン１６が巻回され、バランサ軸８の動
力をカム軸１３に伝達するようになっている。On the other hand, a sprocket 15 is attached to the balancer shaft 8, and this sprocket 15 and the sprocket 14
A cam chain 16 is wound between the two and transmits the power of the balancer shaft 8 to the camshaft 13.

上記カムチェン１６は、第１図に示すようにシリンダ１
の軸方向を斜行するため、そのシリンダ側には空間１７
が形成される。この空間１７にチェノ張力調整装置１８
が設置され、その装置のチェノガイド１９が一定の弾性
力でカムチェン１６の弛み側に当接することによりチェ
ノ張力を調整するようにしている。The cam chain 16 has a cylinder 1 as shown in FIG.
Because the cylinder moves obliquely in the axial direction, there is a space 17 on the cylinder side.
is formed. In this space 17, there is a tension adjustment device 18.
is installed, and the chaino guide 19 of the device comes into contact with the slack side of the cam chain 16 with a certain elastic force, thereby adjusting the chaino tension.

上述したカム軸１３の駆動は、カムチェン１６をクラン
ク軸４に直接巻回させるようにせず、このクランク軸４
よりもカム軸１３に近い位置にあるバランサ軸８に巻回
させて行うようにしているため、カムチェン１６の長さ
はクランク軸４に直接巻回するものに比べて短くなって
いる。しかも、このようにカムチェン１６の長さを短縮
す墨に当たり、従来からエンジンに付設されているバラ
ンサ軸８を有効に活用し、特別に中間軸を増設するよう
なことはしていないから、部品増加による組立工数の増
加や重量増加を招くようなことはない。また、既設の機
構を利用しているからスペースを大きくする必要もない
。The above-mentioned driving of the camshaft 13 is performed without winding the cam chain 16 directly around the crankshaft 4.
Since the cam chain 16 is wound around the balancer shaft 8 which is located closer to the camshaft 13 than the cam chain 13, the length of the cam chain 16 is shorter than that when the cam chain 16 is wound directly around the crankshaft 4. Moreover, in order to shorten the length of the cam chain 16 in this way, the balancer shaft 8 conventionally attached to the engine is effectively utilized, and no special intermediate shaft is added. This increase will not result in an increase in assembly man-hours or weight. Furthermore, since the existing mechanism is used, there is no need to increase the space.

さらに、上記構成によってカムチェン１６はシリンダの
軸方向に斜行しており、その斜行に伴って生ずる空間１
７を利用してチェン張力調整装置１８を配置するように
しているから、エンジンは大型化することはなく、極め
てコンパクトにすることができる。Furthermore, with the above configuration, the cam chain 16 is obliquely moved in the axial direction of the cylinder, and a space 1 is created due to the oblique movement.
Since the chain tension adjustment device 18 is arranged using the engine 7, the engine does not become large and can be made extremely compact.

〔発明の効果〕〔Effect of the invention〕

上述したように、本発明は、既設のバランサ軸を利用し
て、このバランサ軸とカム軸との間にカムチェンを巻回
させるようにしたから、余分の部品を増設することなく
カムチェンの長さを短縮することができる。しかも、こ
のような構成に伴ってカムチェンのシリンダ側に生ずる
空間にチェン張力調整装置を配置するようにしたから、
大型化を招くようなことがなく、装置全体をコンパクト
にすることができる。As described above, the present invention uses an existing balancer shaft and winds the cam chain between the balancer shaft and the cam shaft, so the length of the cam chain can be reduced without adding any extra parts. can be shortened. Moreover, because the chain tension adjustment device is arranged in the space created on the cylinder side of the cam chain due to such a configuration,
The entire device can be made compact without causing an increase in size.

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

第１〜３図は本発明の実施例からなるエンジンを示し、
第１図は第３図のＡ−Ａ断面図、第２図は第３図のＢ−
Ｂ断面図、第３図は第１図のＣ矢視図である。 １・・・シリンダ、２・・・シリンダ頭部、３・・・ク
ランクケース、４・・・クランク軸、６・・・変速機、
８・・・バランサ軸、１１・・・吸気弁、１２・・・排
気弁、１３・・・カム軸、１４．１５・・・スプロケッ
ト、１６・・・カムチェン、１７・・・空間、１８・・
・チェン張力調整装置、１９・・・チェンガイド。1 to 3 show an engine according to an embodiment of the present invention,
Figure 1 is a sectional view taken along line A-A in Figure 3, and Figure 2 is a cross-sectional view taken along line B-- in Figure 3.
B sectional view and FIG. 3 are views taken along arrow C in FIG. 1. 1... Cylinder, 2... Cylinder head, 3... Crank case, 4... Crankshaft, 6... Transmission,
8... Balancer shaft, 11... Intake valve, 12... Exhaust valve, 13... Camshaft, 14.15... Sprocket, 16... Cam chain, 17... Space, 18...・
・Chain tension adjustment device, 19...Chain guide.

Claims (1)

【特許請求の範囲】[Claims] シリンダの下方にクランク軸を配置し、このクランク軸
の後方に変速機を配置し、この変速機とクランク軸との
中間域上方にクランク軸と連動するバランサ軸を配置し
、かつシリンダ頭部に動弁用のカム軸を配置した自動二
輪車用４サイクルエンジンにおいて、前記バランサ軸と
カム軸とをシリンダの軸方向に斜行するカムチェンで連
結し、このカムチェンのシリンダ寄り側の空間にチェン
張力調整装置を配置したことを特徴とする自動二輪車用
エンジンのカム軸駆動機構。A crankshaft is placed below the cylinder, a transmission is placed behind the crankshaft, a balancer shaft that interlocks with the crankshaft is placed above an intermediate region between the transmission and the crankshaft, and a balancer shaft is placed in the cylinder head. In a 4-cycle motorcycle engine equipped with a camshaft for a valve train, the balancer shaft and camshaft are connected by a cam chain that runs diagonally in the axial direction of the cylinder, and the tension of the chain is adjusted in the space on the cylinder side of the cam chain. A camshaft drive mechanism for a motorcycle engine, characterized in that a device is arranged.
JP62024648A 1987-02-06 1987-02-06 Camshaft drive mechanism for motorcycle engine Expired - Fee Related JPH0814255B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP62024648A JPH0814255B2 (en) 1987-02-06 1987-02-06 Camshaft drive mechanism for motorcycle engine

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP62024648A JPH0814255B2 (en) 1987-02-06 1987-02-06 Camshaft drive mechanism for motorcycle engine

Publications (2)

Publication Number Publication Date
JPS63195305A true JPS63195305A (en) 1988-08-12
JPH0814255B2 JPH0814255B2 (en) 1996-02-14

Family

ID=12143958

Family Applications (1)

Application Number Title Priority Date Filing Date
JP62024648A Expired - Fee Related JPH0814255B2 (en) 1987-02-06 1987-02-06 Camshaft drive mechanism for motorcycle engine

Country Status (1)

Country Link
JP (1) JPH0814255B2 (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1998049463A1 (en) * 1997-04-25 1998-11-05 INA Wälzlager Schaeffler oHG Chain tensioner
JP2007100540A (en) * 2005-09-30 2007-04-19 Honda Motor Co Ltd Balancer mechanism of internal combustion engine

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109026251A (en) * 2018-07-05 2018-12-18 昆明云内动力股份有限公司 A kind of gear of engine and the compound timing gear of chain

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5943441U (en) * 1982-09-13 1984-03-22 三洋電機株式会社 automatic paper feeder
JPS5970820A (en) * 1982-10-15 1984-04-21 Yamaha Motor Co Ltd Engine for motorcycle
JPS61123804U (en) * 1985-01-24 1986-08-04

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5943441U (en) * 1982-09-13 1984-03-22 三洋電機株式会社 automatic paper feeder
JPS5970820A (en) * 1982-10-15 1984-04-21 Yamaha Motor Co Ltd Engine for motorcycle
JPS61123804U (en) * 1985-01-24 1986-08-04

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1998049463A1 (en) * 1997-04-25 1998-11-05 INA Wälzlager Schaeffler oHG Chain tensioner
JP2007100540A (en) * 2005-09-30 2007-04-19 Honda Motor Co Ltd Balancer mechanism of internal combustion engine

Also Published As

Publication number Publication date
JPH0814255B2 (en) 1996-02-14

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