JPS6232203A - Cam shaft drive device in engine - Google Patents

Cam shaft drive device in engine

Info

Publication number
JPS6232203A
JPS6232203A JP17146285A JP17146285A JPS6232203A JP S6232203 A JPS6232203 A JP S6232203A JP 17146285 A JP17146285 A JP 17146285A JP 17146285 A JP17146285 A JP 17146285A JP S6232203 A JPS6232203 A JP S6232203A
Authority
JP
Japan
Prior art keywords
engine
reduction gear
camshaft
gear
drive shaft
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.)
Pending
Application number
JP17146285A
Other languages
Japanese (ja)
Inventor
Eisaku Ebisu
英策 胡子
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.)
Mazda Motor Corp
Original Assignee
Mazda Motor Corp
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 Mazda Motor Corp filed Critical Mazda Motor Corp
Priority to JP17146285A priority Critical patent/JPS6232203A/en
Publication of JPS6232203A publication Critical patent/JPS6232203A/en
Pending 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
    • 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
    • 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
    • F02B2275/00—Other engines, components or details, not provided for in other groups of this subclass
    • F02B2275/18—DOHC [Double overhead camshaft]

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Valve-Gear Or Valve Arrangements (AREA)

Abstract

PURPOSE:To make compact the dimensions of an engine in the radial direction of the drive shaft thereof without the dimensions of the engine being increased in the axial direction of the drive shaft, by locating a reduction gear for transmitting the drive force of the engine to cam shafts in a suitable section of the engine. CONSTITUTION:The drive force of a crank shaft 4 as a drive shaft is transmitted to a plurality of cam shafts 5, 6 through a reduction gear 7 by means of a plurality of chains 11, 12. Further, the reduction gear 7 is composed of a cam shaft side transmitting section 7a consisting of a gear having a predetermined number of teeth, and a drive side transmitting section 7b consisting of a gear arranged outside of the afore-mentioned transmitting section 7a and having teeth of the number which is twice the number of the afore-mentioned gear,both transmitting sections 7a, 7b being coupled with each other. In this arrangement, the reduction gear 7 is positioned above head bolts 3 on the front end section of a cylinder head, and the cam shaft side transmitting section 7a is arranged directly above the head bolts 3. With this arrangement, it is possible to restrain the diameters of the gears 9, 10 of both cam shaft 5, 6 from increasing.

Description

【発明の詳細な説明】 （産業上の利用分野） 本発明は、エンジンのカムシャフト駆動装置に関し、特
にエンジンをコンパクトなものにするための対策に関す
る。DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a camshaft drive device for an engine, and particularly to measures for making the engine compact.

（従来の技術） 一般に、エンジンのカムシャフトを駆動する方式として
、エンジン駆動軸とカムシャフトとの間でベルトあるい
はチェーンを巻掛けて、駆動軸により上記ベルトあるい
はチェーンを介してカムシャフトを直接駆動するように
したちのは広く使用されている。(Prior art) Generally, as a method of driving the camshaft of an engine, a belt or chain is wound between the engine drive shaft and the camshaft, and the camshaft is directly driven by the drive shaft via the belt or chain. It is widely used.

しかし、このようなカムシャフト直接駆動方式を採用す
ると、カムシャフトのギヤの直径は減速比の関係上駆動
軸のギヤの直径の２倍と大きいものになるので、駆動軸
半径方向のエンジン寸法が増加する。However, when such a camshaft direct drive method is adopted, the diameter of the camshaft gear is twice as large as the diameter of the drive shaft gear due to the reduction ratio, so the engine dimensions in the radial direction of the drive shaft are To increase.

そこで、上記欠点を解消してエンジンのコンパクト化を
図るべく、従来、例えば実開昭５９−３５６０３号公報
に開示されているように、駆動軸とカムシャフトとの間
に減速ギヤを配設して、カムシャフトのギヤの直径を小
さく抑えるようにしたものが提案されている。Therefore, in order to eliminate the above-mentioned drawbacks and make the engine more compact, a reduction gear has been conventionally disposed between the drive shaft and the camshaft, as disclosed in, for example, Japanese Utility Model Application Publication No. 59-35603. Therefore, a method has been proposed in which the diameter of the camshaft gear is kept small.

（発明が解決しようとする問題点） ところが、このような減速ギヤは、駆動軸方向に２枚の
ギヤを軸直結してなるものであるので、減速ギヤの配置
によって駆動軸方向のエンジン寸法が増加するという問
題が生ずる。(Problem to be solved by the invention) However, since such a reduction gear is made up of two gears directly connected in the direction of the drive shaft, the engine dimensions in the direction of the drive shaft may be affected by the arrangement of the reduction gears. The problem arises of increasing

本発明はかかる点に鑑みてなされたものであり、その目
的とするところは、減速ギヤをエンジンの適切な部位に
配置することにより、駆動軸方向のエンジン寸法を増加
することなく、カムシャフトのギＶの直径を小さく抑え
て駆動軸半径方向のエンジン寸法をコンパクト化するこ
とにある。The present invention has been made in view of the above, and its purpose is to dispose the reduction gear at an appropriate location in the engine so that the camshaft can be adjusted without increasing the engine dimensions in the direction of the drive shaft. The objective is to reduce the diameter of the gear V to make the engine size compact in the radial direction of the drive shaft.

〈問題点を解決するための手段） 上記目的を達成するため、本発明の解決手段は、駆動軸
の駆動力を、ベルトあるいはチェーンにより減速ギヤを
介してカムシャフトに伝達するようにしたエンジンのカ
ムシャフト駆動装置を前提とする。そして、上記減速ギ
ヤをヘッドボルトよりも上方に配置する。さらに、この
減速ギＶのカムシャフト側伝達部を上記ヘッドボルトの
直上方に配置する構成としたものである。<Means for Solving the Problems> In order to achieve the above object, the solving means of the present invention is an engine in which the driving force of the drive shaft is transmitted to the camshaft via a reduction gear by a belt or chain. Assumes a camshaft drive device. The reduction gear is arranged above the head bolt. Furthermore, the camshaft side transmission portion of this reduction gear V is arranged directly above the head bolt.

（作用） 上記の構成により、本発明では、減速ギヤの採用によっ
て、カムシャフトのギヤの直径が小さく抑えられて、駆
動軸半径方向のエンジン寸法がコンパクトなものになる
。しかも、この減速ギヤをヘッドボルトよりも上方に配
置し、かつこの減速ギヤのカムシャフト側伝達部を、ヘ
ッドボルトによるシリンダヘッド締結作業を可能にすべ
く確保されたヘッドボルト直上方のスペースを利用して
配置したので、シリンダヘッドから前側には通常のエン
ジンと同様に１つのギヤ（駆動軸側伝達部）のみが配置
されることになり、駆動軸方向のエンジン寸法が増加す
ることはない。(Function) According to the above configuration, in the present invention, by employing a reduction gear, the diameter of the gear of the camshaft can be kept small, and the engine size in the radial direction of the drive shaft can be made compact. Moreover, this reduction gear is arranged above the head bolt, and the camshaft side transmission part of this reduction gear is utilized in the space just above the head bolt, which is secured to enable the cylinder head tightening work using the head bolt. As a result, only one gear (drive shaft side transmission section) is disposed on the front side from the cylinder head, similar to a normal engine, and the engine size in the drive shaft direction does not increase.

（実施例） 以下、本発明の実施例を図面に基づいて説明する。(Example) Embodiments of the present invention will be described below based on the drawings.

第１図および第２図は、本発明に係るカムシャフト駆動
装置を備えたＤｏｔ−１ｃタイプのエンジンを示す。第
１図および第２図において、１はシリンダブロック、２
は該シリンダブロック１上に配設され該シリンダブロッ
ク１にヘッドボルト３゜３・・・で締結されたシリンダ
ヘッドであって、該シリンダブロック１の下部には駆動
軸としてのクランクシャフト４が支承されている。そし
て、上記シリンダヘッド２のヘッドポルト３上部は他の
部分よりも段下げて形成されていて、上記ヘッドボルト
３の直上方にヘッドボルト３によるシリンダヘッド２の
締結作業を可能にすべく所定のスペースを確保するよう
にしている。一方、シリンダヘッド２の上部にはそれぞ
れ吸・排気系専用のカムシャフト５，６が上記クランク
シャフト４と平行に支承されている。1 and 2 show a Dot-1c type engine equipped with a camshaft drive according to the invention. In Figures 1 and 2, 1 is a cylinder block, 2 is a cylinder block, and 2 is a cylinder block.
is a cylinder head disposed on the cylinder block 1 and fastened to the cylinder block 1 with head bolts 3. A crankshaft 4 as a drive shaft is supported at the bottom of the cylinder block 1. has been done. The upper part of the head port 3 of the cylinder head 2 is formed to be lower than other parts, and a predetermined portion is formed directly above the head bolt 3 to enable the tightening operation of the cylinder head 2 with the head bolt 3. I'm trying to make sure I have enough space. On the other hand, camshafts 5 and 6 dedicated to intake and exhaust systems are supported in the upper part of the cylinder head 2 in parallel with the crankshaft 4, respectively.

また、上記シリンダヘッド２のカムシャフト５゜６の間
には、減速ギヤ７が配設されている。該減速ギヤ７は、
一定歯数のギヤよりなるカムシャフト側伝達部７ａと、
該カムシャフト側伝達部７ａの外方に配置され、その２
倍の歯数を有するギヤよりなる駆動軸側伝達部７ｂとを
軸連結してなるものである。そして、この減速ギヤ７は
、シリンダヘッド２の前端部のヘッドボルト３．３より
も上方に配置されているとともに、この減速ギヤ７のカ
ムシャフト側伝達部７ａは上記ヘッドボルト３．３の直
上方に配＠されている。Further, a reduction gear 7 is disposed between the camshafts 5 and 6 of the cylinder head 2. The reduction gear 7 is
a camshaft side transmission section 7a consisting of a gear with a constant number of teeth;
It is arranged outside the camshaft side transmission part 7a, and the second
It is formed by axially connecting the drive shaft side transmission section 7b made of a gear having twice the number of teeth. This reduction gear 7 is arranged above the head bolt 3.3 at the front end of the cylinder head 2, and the camshaft side transmission section 7a of this reduction gear 7 is directly connected to the head bolt 3.3. It is placed at the top.

さらに、上記クランクシャフト４の前端部およびカムシ
ャフト５．６の各前ＤＨｉ部には、それぞれ同歯数のギ
ヤ８．９．１０が固定されている。そして、クランクシ
ャフト４のギヤ８と減速ギヤ７の駆動軸側伝達部７ｂと
の間には駆ｖＪ！ｔｈ側チェーン１１が巻掛けられてい
る。一方、減速ギヤ７のカムシャフト側伝達部７ａとカ
ムシャフト５．６の各ギヤ９，１０との間にはカムシャ
フト側チェーン１２が巻掛けられていて、クランクシャ
フト４の駆動力を、ベルト１１．１２により減速ギヤ７
を介してカムシャフト５．６に伝達して、該カムシャフ
ト５，６をクランクシャフト４の回転数の２分の１の回
転数でもって駆動するようにしている。Furthermore, gears 8.9.10 having the same number of teeth are fixed to the front end of the crankshaft 4 and each front DHi portion of the camshaft 5.6, respectively. And, between the gear 8 of the crankshaft 4 and the drive shaft side transmission section 7b of the reduction gear 7, there is a drive VJ! A th side chain 11 is wound around it. On the other hand, a camshaft side chain 12 is wound between the camshaft side transmission section 7a of the reduction gear 7 and each gear 9, 10 of the camshaft 5.6, and the driving force of the crankshaft 4 is transferred to the belt. 11. Reduction gear 7 by 12
The rotational speed is transmitted to the camshaft 5.6 via the camshaft 5.6, so that the camshafts 5, 6 are driven at a rotation speed that is half the rotation speed of the crankshaft 4.

尚、１３．１４はチェーン１１をガイドするチェーンテ
ンショナ、１５はカバー、１６．１７はそれぞれ補機駆
動用プーリおよびベルトである。Note that 13 and 14 are chain tensioners that guide the chain 11, 15 is a cover, and 16 and 17 are auxiliary drive pulleys and belts, respectively.

したがって、上記実施例においては、減速ギヤ７の採用
によって、カムシャフト５．６のギヤ９゜１０の直径が
小さく抑えられるので、駆動軸半径方向のエンジン寸法
をコンパクトにすることができる。Therefore, in the embodiment described above, by employing the reduction gear 7, the diameter of the gear 9.degree. 10 of the camshaft 5.6 can be kept small, so that the engine size in the radial direction of the drive shaft can be made compact.

しかも、この減速ギヤ７をヘッドボルト３，３よりも上
方に配置し、かつこの減速ギヤ７のカムシャフト側伝達
部７ａを、ヘッドボルト３．３を締めたり緩めたりする
作業を可能にすべく確保されたヘッドボルト直上方のス
ペースを利用して配置したので、シリンダヘッド２から
前側には通常のエンジンと同様に１つのギヤ（駆動軸側
伝達部７ｂ）のみが配置されることになる。このことに
より、駆動軸方向のエンジン寸法の増加を防止すること
ができる。Moreover, this reduction gear 7 is arranged above the head bolts 3, 3, and the camshaft side transmission section 7a of this reduction gear 7 is designed to enable work to tighten or loosen the head bolts 3.3. Since the arrangement is made using the secured space directly above the head bolt, only one gear (drive shaft side transmission section 7b) is arranged in front of the cylinder head 2, as in a normal engine. This makes it possible to prevent an increase in engine dimensions in the direction of the drive shaft.

また、減速ギヤ７において駆動軸側伝達部７ｂよりも直
径の小さいカムシャフト側伝達部７ａがヘッドポル１〜
３の直上方に配置されるので、減速ギＶ７を取付けた状
態でヘッドボルト３の締結を支障なく行うことが可能で
ある。In addition, in the reduction gear 7, the camshaft side transmission section 7a, which has a smaller diameter than the drive shaft side transmission section 7b, is connected to the head pole 1 to
3, the head bolt 3 can be fastened without any problem with the reduction gear V7 attached.

尚、上記実施例では、駆動軸側の各ギヤ８，７ｂ問およ
びカムシャフト側の各ギヤ７ａ、９．１０間にチェーン
１１．１２を巻掛けたが、タイミングベルトその他秤々
のチェーンあるいはベルトを巻掛けるようにしてもよい
。In the above embodiment, the chain 11.12 is wound between the gears 8, 7b on the drive shaft side and the gears 7a, 9.10 on the camshaft side. You may also wrap it around it.

また、上記実施例のＤＯＨＣタイプの他、５ＯＨＣタイ
プ等種々のタイプのエンジンにも適用できるものである
。Further, in addition to the DOHC type of the above embodiment, the present invention can also be applied to various types of engines such as a 5OHC type.

（発明の効果） 以上説明したように、本発明のエンジンのカムシャフト
駆動装置によれば、減速ギヤをヘッドボルトよりも上方
に配置するとともに、この減速ギヤのカムシャフト側伝
達部を上記ヘッドボルトの直上方に配置して、駆動軸の
駆動力を、ベルトあるいはチェーンにより上記減速ギヤ
をｆＦ　してカムシャフトに伝達するようにしたので、
ヘッドボルト締結作業用のヘッドボルト直上方スペース
を有効利用して減速ギヤ採用による駆動軸方向のエンジ
ン寸法の増大を防止しつつ、カムシャフトのギヤの直径
の小径化によって駆動軸半径方向のエンジン寸法のコン
パクト化を図ることができる。(Effects of the Invention) As described above, according to the engine camshaft drive device of the present invention, the reduction gear is disposed above the head bolt, and the camshaft side transmission portion of the reduction gear is connected to the head bolt. The drive shaft is placed directly above the camshaft, and the driving force of the drive shaft is transmitted to the camshaft through the reduction gear fF using a belt or chain.
By effectively utilizing the space directly above the head bolt for head bolt tightening work, we can prevent the engine size from increasing in the drive shaft direction due to the adoption of a reduction gear, while reducing the engine size in the drive shaft radial direction by reducing the diameter of the camshaft gear. can be made more compact.

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

図面は本発明の実施例を示し、第１図は正面図、第２図
は第１図の縦断側面図である。 ３・・・ヘッドボルト、４・・・クランクシャフト、５
゜６°°゛カムシヤフト、７・・・減速ギヤ、７ａ・・
・カムシャフト側伝達部、１１・・・チェーン、１２・
・・チェーン。 代　　理　　人　　　　　弁理士　　前　　１）　　弘
　二コＪ。The drawings show an embodiment of the present invention, and FIG. 1 is a front view, and FIG. 2 is a longitudinal sectional side view of FIG. 1. 3...Head bolt, 4...Crankshaft, 5
゜6°°゛Camshaft, 7... Reduction gear, 7a...
・Camshaft side transmission part, 11...chain, 12・
··chain. Agent Patent Attorney Former 1) Hironiko J.

Claims (1)

【特許請求の範囲】[Claims] （１）駆動軸の駆動力を、ベルトあるいはチェーンによ
り減速ギヤを介してカムシャフトに伝達するようにした
エンジンのカムシャフト駆動装置において、上記減速ギ
ヤはヘッドボルトよりも上方に配置されているとともに
、この減速ギヤのカムシャフト側伝達部は上記ヘッドボ
ルトの直上方に配置されていることを特徴とするエンジ
ンのカムシャフト駆動装置。(1) In an engine camshaft drive device in which the driving force of the drive shaft is transmitted to the camshaft via a reduction gear by a belt or chain, the reduction gear is located above the head bolt, and . A camshaft drive device for an engine, wherein the camshaft side transmission section of the reduction gear is disposed directly above the head bolt.
JP17146285A 1985-08-02 1985-08-02 Cam shaft drive device in engine Pending JPS6232203A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP17146285A JPS6232203A (en) 1985-08-02 1985-08-02 Cam shaft drive device in engine

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP17146285A JPS6232203A (en) 1985-08-02 1985-08-02 Cam shaft drive device in engine

Publications (1)

Publication Number Publication Date
JPS6232203A true JPS6232203A (en) 1987-02-12

Family

ID=15923556

Family Applications (1)

Application Number Title Priority Date Filing Date
JP17146285A Pending JPS6232203A (en) 1985-08-02 1985-08-02 Cam shaft drive device in engine

Country Status (1)

Country Link
JP (1) JPS6232203A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5038729A (en) * 1988-11-11 1991-08-13 Nissan Motor Co., Ltd. Distributor driving apparatus for engines
US5058458A (en) * 1989-04-28 1991-10-22 Tsubakimoto Chain Co. Camshaft driving mechanism

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS58144614A (en) * 1982-02-23 1983-08-29 Honda Motor Co Ltd Cam shaft driving apparatus for engine

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS58144614A (en) * 1982-02-23 1983-08-29 Honda Motor Co Ltd Cam shaft driving apparatus for engine

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5038729A (en) * 1988-11-11 1991-08-13 Nissan Motor Co., Ltd. Distributor driving apparatus for engines
US5058458A (en) * 1989-04-28 1991-10-22 Tsubakimoto Chain Co. Camshaft driving mechanism

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