JPH04272548A - Cam chain tensioner for four-cycle engine - Google Patents

Cam chain tensioner for four-cycle engine

Info

Publication number
JPH04272548A
JPH04272548A JP5354191A JP5354191A JPH04272548A JP H04272548 A JPH04272548 A JP H04272548A JP 5354191 A JP5354191 A JP 5354191A JP 5354191 A JP5354191 A JP 5354191A JP H04272548 A JPH04272548 A JP H04272548A
Authority
JP
Japan
Prior art keywords
tensioner
cam chain
support shaft
adjuster
rear side
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
JP5354191A
Other languages
Japanese (ja)
Inventor
Kunio Arase
国男 荒瀬
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.)
Suzuki Motor Corp
Original Assignee
Suzuki 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 Suzuki Motor Corp filed Critical Suzuki Motor Corp
Priority to JP5354191A priority Critical patent/JPH04272548A/en
Publication of JPH04272548A publication Critical patent/JPH04272548A/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
    • 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
    • F02B67/00—Engines characterised by the arrangement of auxiliary apparatus not being otherwise provided for, e.g. the apparatus having different functions; Driving auxiliary apparatus from engines, not otherwise provided for
    • F02B67/04—Engines characterised by the arrangement of auxiliary apparatus not being otherwise provided for, e.g. the apparatus having different functions; Driving auxiliary apparatus from engines, not otherwise provided for of mechanically-driven auxiliary apparatus
    • F02B67/06—Engines characterised by the arrangement of auxiliary apparatus not being otherwise provided for, e.g. the apparatus having different functions; Driving auxiliary apparatus from engines, not otherwise provided for of mechanically-driven auxiliary apparatus driven by means of chains, belts, or like endless members
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16H—GEARING
    • F16H7/00—Gearings for conveying rotary motion by endless flexible members
    • F16H7/08—Means for varying tension of belts, ropes, or chains
    • F16H2007/0802—Actuators for final output members
    • F16H2007/0806—Compression coil springs
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16H—GEARING
    • F16H7/00—Gearings for conveying rotary motion by endless flexible members
    • F16H7/08—Means for varying tension of belts, ropes, or chains
    • F16H2007/0863—Finally actuated members, e.g. constructional details thereof
    • F16H2007/0872—Sliding members
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16H—GEARING
    • F16H7/00—Gearings for conveying rotary motion by endless flexible members
    • F16H7/08—Means for varying tension of belts, ropes, or chains
    • F16H7/0829—Means for varying tension of belts, ropes, or chains with vibration damping means

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Devices For Conveying Motion By Means Of Endless Flexible Members (AREA)

Abstract

PURPOSE:To reduce bending of a tensioner and also to reduce vibrations of the tensioner itself and a cam chain so as to prevent generation of noise by installing a dynamic damper on the rear side of that portion of the tensioner which is halfway between the support shaft of the tensioner and an adjuster. CONSTITUTION:A tensioner 6 has a support shaft 7 provided at one end thereof and axially mounted on a crank case 8 and disposed on the outside of a cam chain 5, a spring 9 presses the other end portion of the tensioner 6 so as to keep the cam chain 5 under strain. A dynamic damper 11 having an appropriate spring constant and weight is installed on the rear side of a portion halfway between the support shaft 7 of the tensioner 6 and an adjustor 10. The tensioner 6 is bent mostly at its portion halfway between the support shaft 7 and the adjuster 10 but this portion is supported by the damper 11 and so bending of the tensioner 6 is prevented and vibration can be reduced. The tensioner 6 is controlled by sandwiching an elastic body 13 of synthetic resin or the like between two core plates 12 and covering the whole outside of the tensioner with an elastic body 14. Vibration of the cam chain 5 can thus be reduced, and noise can also be reduced.

Description

【発明の詳細な説明】[Detailed description of the invention]

【０００１】0001

【産業上の利用分野】この発明は、四サイクルエンジン
のカムチエンテンショナーに関する。BACKGROUND OF THE INVENTION 1. Field of the Invention This invention relates to a cam chain tensioner for a four-stroke engine.

【０００２】0002

【従来の技術】四サイクルエンジンは、クランクシャフ
トとシリンダーヘッドに軸架したカムシャフトをカムチ
エンで連結し、カムシャフトをクランクシャフトに連動
して回転させて、カムシャフトで吸気弁及び排気弁を開
閉している。カムチエンは、図４に示すように、一端を
支軸Ａでクランクケースに軸支した帯状のテンショナー
ＢをカムチエンＣの後側に添え、テンショナーＢの他端
寄りをアジャスターＤのバネＥで後側から押してテンシ
ョナーＢをカムチエンＣに押付け、カムチエンＣをバネ
Ｅの所定弾力で張った状態に保つようにしている。又、
テンショナーは、後側にバネ板を添えて、テンショナー
自体に弾性を持たせてカムチエンに押付けるようにした
ものもある。例えば、特開昭６３−６２６２号公報参照
。[Prior Art] In a four-cycle engine, a crankshaft and a camshaft mounted on a cylinder head are connected by a cam chain, and the camshaft is rotated in conjunction with the crankshaft, and the camshaft opens and closes intake and exhaust valves. are doing. As shown in Fig. 4, the cam chain has a belt-shaped tensioner B, one end of which is supported on the crankcase by a support shaft A, attached to the rear side of the cam chain C, and the other end of the tensioner B is attached to the rear side by a spring E of an adjuster D. The tensioner B is pressed against the cam chain C by pressing the tensioner B, and the cam chain C is kept tensioned by the predetermined elasticity of the spring E. or,
Some tensioners have a spring plate attached to the rear side to make the tensioner itself elastic so that it can be pressed against the cam chain. For example, see Japanese Patent Application Laid-open No. 63-6262.

【０００３】0003

【発明が解決しようとする課題】テンショナーは、図４
に点線で示すように、支点になっている支軸Ａとアジャ
スターＤの部分に対し、テンショナーＢが撓んで変形し
、カムチエンＣに振動を与える。又、テンショナーＢ自
体が固有振動し、カムチエンＣが振れて騒音が発生する
。そのため、テンショナーＢ自体の剛性を高め、アジャ
スターＤのバネＥの弾力を高めると、カムチエンＣの振
動を少くできるが、重量が増し、カムチエンＣに加わる
抵抗が増してメカニカルロスが増加する。尚、テンショ
ナーＢの剛性を高めることは、固有振動数を別の個所に
移すことで、固有振動の根本対策にはならない。[Problem to be solved by the invention] The tensioner is shown in Fig. 4.
As shown by the dotted line in , the tensioner B bends and deforms with respect to the support shaft A and the adjuster D, which serve as fulcrums, and gives vibration to the cam chain C. Additionally, the tensioner B itself undergoes natural vibration, causing the cam chain C to vibrate and generate noise. Therefore, by increasing the rigidity of the tensioner B itself and increasing the elasticity of the spring E of the adjuster D, the vibration of the cam chain C can be reduced, but the weight increases, the resistance applied to the cam chain C increases, and mechanical loss increases. Note that increasing the rigidity of the tensioner B moves the natural frequency to another location, and is not a fundamental countermeasure against natural vibration.

【０００４】かかる点に鑑み、この発明は、テンショナ
ーの撓みを少くすると共に、テンショナー自体の振動を
制振できて、カムチエンの振動を少くでき、騒音の発生
を防止できる四サイクルエンジンのカムチエンテンショ
ナーを得ることを目的とする。In view of the above, the present invention provides a cam chain tensioner for a four-stroke engine that can reduce the deflection of the tensioner, suppress the vibration of the tensioner itself, reduce the vibration of the cam chain, and prevent the generation of noise. The purpose is to obtain.

【０００５】[0005]

【課題を解決するための手段】上記目的を達成するため
に、この発明の四サイクルエンジンのカムチエンテンシ
ョナーは、クランクシャフトとカムシャフトを連結する
カムチエンの外側に一端を支軸でクランクケースに軸支
した帯状のテンショナーを添え、テンショナーの他端寄
りを後側からアジャスターのバネで押してテンショナー
をカムチエンに押付けてカムチエンを張るようにしたも
ので、テンショナーの支軸とアジャスターの中間に後側
にダイナミックダンパーを取付けるようにしたことにあ
る。[Means for Solving the Problems] In order to achieve the above object, the cam chain tensioner for a four-cycle engine of the present invention has one end attached to the outside of the cam chain that connects the crankshaft and the camshaft to the crankcase. A belt-shaped tensioner is attached, and the other end of the tensioner is pushed by the spring of the adjuster from the rear side, and the tensioner is pressed against the cam chain to tension the cam chain. The problem lies in the fact that a damper was installed.

【０００６】そして、テンショナーを二枚の芯板の間に
合成樹脂などの弾性体を挟み、二枚の芯板の外側全体を
弾性体で包むようにしたことにある。Another feature of the tensioner is that an elastic body such as a synthetic resin is sandwiched between two core plates, and the entire outside of the two core plates is wrapped with the elastic body.

【０００７】[0007]

【作用】テンショナーは、支軸とアジャスターで支えて
いる個所を支点にして撓もうとするが、支軸とアジャス
ターの中間に設けたダイナミックダンパーがあって、撓
みを防止できる。又、テンショナーは二枚の芯板にし、
その間に挟んだ弾性体が二枚の芯板の固有振動数による
振動を制振する。このため、カムチエンの振動を少くで
きて騒音の発生を低減できる。[Operation] The tensioner tries to bend using the part supported by the spindle and adjuster as a fulcrum, but there is a dynamic damper installed between the spindle and the adjuster to prevent the tensioner from bending. Also, the tensioner has two core plates,
The elastic body sandwiched between them suppresses vibrations caused by the natural frequencies of the two core plates. Therefore, the vibration of the cam chain can be reduced and the generation of noise can be reduced.

【０００８】[0008]

【実施例】以下、本発明の実施例を図１乃至図３によっ
て説明する。四サイクルエンジンのクランクシャフト１
に取付けたスプロケット２と、シリンダーヘッドに軸架
したカムシャフト３に取付けたスプロケット４をカムチ
エン５で連結し、クランクシャフト１でカムシャフト３
を連動させて回転させ、カムシャフト３のカムで、吸気
弁及び排気弁を開閉する。Embodiments Hereinafter, embodiments of the present invention will be explained with reference to FIGS. 1 to 3. Four-cycle engine crankshaft 1
The sprocket 2 attached to the cylinder head and the sprocket 4 attached to the camshaft 3 mounted on the cylinder head are connected by a cam chain 5, and the camshaft 3 is connected to the crankshaft 1.
are rotated in conjunction with each other, and the cam of the camshaft 3 opens and closes the intake valve and exhaust valve.

【０００９】テンショナー６は、一端に設けた支軸７を
クランクケース８に軸着して、カムチエン５の外側に添
え、テンショナー６の他端寄りをバネ９で押圧するアジ
ャスター１０に当て、後側からテンショナー６をカムチ
エン５に押付けて、所定のバネ９の弾力で、カムチエン
５を張った状態に保つ。The tensioner 6 has a support shaft 7 provided at one end attached to the crankcase 8, and is attached to the outside of the cam chain 5, and the other end of the tensioner 6 is applied to an adjuster 10 pressed by a spring 9, and the tensioner 6 is attached to the rear side. Then, the tensioner 6 is pressed against the cam chain 5, and the cam chain 5 is kept in a tensioned state by the elasticity of the predetermined spring 9.

【００１０】テンショナー６の支軸７とアジャスター１
０の中間後側には、適度のバネ定数と重量を持たせたダ
イナミックダンパー１１を取付ける。テンショナー６は
、支軸７とアジャスター１０の位置を支点にして撓み、
支軸７とアジャスター１０の中間が最も撓むことになる
が、この部分をダイナミックダンパー１１で支えている
ので、撓みを防いで振動を少くできる。The support shaft 7 of the tensioner 6 and the adjuster 1
A dynamic damper 11 with an appropriate spring constant and weight is attached to the middle rear side of the 0. The tensioner 6 is bent around the support shaft 7 and the adjuster 10,
The middle part between the support shaft 7 and the adjuster 10 is most likely to be bent, but since this part is supported by the dynamic damper 11, the bending can be prevented and vibrations can be reduced.

【００１１】又、テンショナー６は、内側に帯状の二枚
の芯板１２を設け、二枚の芯板１２の間に合成樹脂など
の弾性材１３を挟んで接着又は焼付けなどで固定する。 そして、二枚の芯板１２の外側全体を弾性体１４を焼付
けて包むようにする。二枚の芯板１２の間に挟んだ弾性
材１３は、二枚の芯板１２の固有振動数による振動を制
振して振動を少くすることができる。The tensioner 6 is provided with two belt-shaped core plates 12 on the inside, and an elastic material 13 such as synthetic resin is sandwiched between the two core plates 12 and fixed by gluing or baking. Then, the elastic body 14 is baked and wrapped around the entire outside of the two core plates 12. The elastic material 13 sandwiched between the two core plates 12 can suppress vibrations caused by the natural frequencies of the two core plates 12, thereby reducing the vibrations.

【００１２】0012

【発明の効果】以上説明したように、この発明は、上述
のように構成したので、テンショナーの後側の支軸とア
ジャスターの中間に設けたダイナミックダンパーで、テ
ンショナーが支軸とアジャスターを支点にして撓んで振
動するのを防ぐことができる。又、テンショナーの芯板
を二枚にしてその間に弾性材を挟むことによって、弾性
材で制振できて、テンショナーの固有振動の振幅を小さ
く押えることができる。これによって、カムチエンの振
動が少くなり、振動による騒音の発生を防止できる。[Effects of the Invention] As explained above, since the present invention is configured as described above, the tensioner uses the support shaft and the adjuster as a fulcrum by using the dynamic damper provided between the support shaft on the rear side of the tensioner and the adjuster. This can prevent vibration due to bending. Furthermore, by using two core plates for the tensioner and sandwiching an elastic material between them, vibration can be damped by the elastic material, and the amplitude of the natural vibration of the tensioner can be kept small. This reduces the vibration of the cam chain and prevents the generation of noise due to vibration.

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

【図１】本発明の実施例を示す正面図である。FIG. 1 is a front view showing an embodiment of the present invention.

【図２】本発明の実施例を示すテンショナー単体の正面
図である。FIG. 2 is a front view of a tensioner alone showing an embodiment of the present invention.

【図３】本発明の実施例を示すテンショナーの部分縦断
面図である。FIG. 3 is a partial vertical sectional view of a tensioner showing an embodiment of the present invention.

【図４】従来例のテンショナーを示す正面図である。FIG. 4 is a front view showing a conventional tensioner.

【符号の説明】[Explanation of symbols]

１　　クランクシャフト ３　　カムシャフト ５　　カムチエン ６　　テンショナー ７　　支軸 ８　　クランクケース ９　　バネ １０　　アジャスター １１　　ダイナミックダンパー １２　　芯板 １３　　弾性材 １４　　弾性体 1 Crankshaft 3 Camshaft 5 Kamchien 6 Tensioner 7 Support shaft 8 Crank case 9 Spring 10 Adjuster 11 Dynamic damper 12 Core plate 13 Elastic material 14 Elastic body

Claims (2)

【特許請求の範囲】[Claims] 【請求項１】　　クランクシャフトとカムシャフトを連
結するカムチエンの外側に一端を支軸でクランクケース
に軸支した帯状のテンショナーを添え、テンショナーの
他端寄りを後側からアジャスターのバネで押してテンシ
ョナーをカムチエンに押付けてカムチエンを張るように
したもので、テンショナーの支軸とアジャスターの中間
に後側にダイナミックダンパーを取付けるようにしたこ
とを特徴とする四サイクルエンジンのカムチエンテンシ
ョナー。Claim 1: A belt-shaped tensioner is attached to the outside of the cam chain that connects the crankshaft and the camshaft, and one end is supported on the crankcase by a spindle, and the other end of the tensioner is pushed from the rear side by an adjuster spring to tighten the tensioner. A cam chain tensioner for four-stroke engines that tensions the cam chain by pressing it against the cam chain, and is characterized by having a dynamic damper installed on the rear side between the tensioner support shaft and the adjuster. 【請求項２】　　クランクシャフトとカムシャフトを連
結するカムチエンの外側に一端を支軸でクランクケース
に軸支した帯状のテンショナーを添え、テンショナーの
他端寄りを後側からアジャスターのバネで押してテンシ
ョナーをカムチエンに押付けてカムチエンを張るように
したもので、テンショナーを二枚の芯板の間に合成樹脂
などの弾性材を挟み、二枚の芯板の外側全体を弾性体で
包むようにしたことを特徴とする四サイクルエンジンの
チエンテンショナー。Claim 2: A belt-shaped tensioner is attached to the outside of the cam chain that connects the crankshaft and the camshaft, and one end is supported on the crankcase by a spindle, and the other end of the tensioner is pushed by an adjuster spring from the rear side to tighten the tensioner. The cam chain is tensioned by pressing it against the cam chain, and is characterized by sandwiching an elastic material such as synthetic resin between the tensioner and two core plates, and wrapping the entire outside of the two core plates with the elastic body. Chain tensioner for four-stroke engines.
JP5354191A 1991-02-27 1991-02-27 Cam chain tensioner for four-cycle engine Pending JPH04272548A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP5354191A JPH04272548A (en) 1991-02-27 1991-02-27 Cam chain tensioner for four-cycle engine

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP5354191A JPH04272548A (en) 1991-02-27 1991-02-27 Cam chain tensioner for four-cycle engine

Publications (1)

Publication Number Publication Date
JPH04272548A true JPH04272548A (en) 1992-09-29

Family

ID=12945664

Family Applications (1)

Application Number Title Priority Date Filing Date
JP5354191A Pending JPH04272548A (en) 1991-02-27 1991-02-27 Cam chain tensioner for four-cycle engine

Country Status (1)

Country Link
JP (1) JPH04272548A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6955622B2 (en) * 2002-05-07 2005-10-18 H. Winklhofer & Sohne Gmbh And Co. Kg Preassembled drive means unit including a mounting aid
US7220196B2 (en) * 2001-12-13 2007-05-22 Ina-Schaeffler Kg Chain drive for an internal combustion engine

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7220196B2 (en) * 2001-12-13 2007-05-22 Ina-Schaeffler Kg Chain drive for an internal combustion engine
US6955622B2 (en) * 2002-05-07 2005-10-18 H. Winklhofer & Sohne Gmbh And Co. Kg Preassembled drive means unit including a mounting aid

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