JPH1030696A - Chain tensioner - Google Patents

Chain tensioner

Info

Publication number
JPH1030696A
JPH1030696A JP18921696A JP18921696A JPH1030696A JP H1030696 A JPH1030696 A JP H1030696A JP 18921696 A JP18921696 A JP 18921696A JP 18921696 A JP18921696 A JP 18921696A JP H1030696 A JPH1030696 A JP H1030696A
Authority
JP
Japan
Prior art keywords
screw shaft
chain
pressure
housing
chain tensioner
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
JP18921696A
Other languages
Japanese (ja)
Other versions
JP3590205B2 (en
Inventor
Tomoyoshi Izutsu
智善 井筒
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.)
NTN Corp
Original Assignee
NTN Corp
NTN Toyo Bearing 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 NTN Corp, NTN Toyo Bearing Co Ltd filed Critical NTN Corp
Priority to JP18921696A priority Critical patent/JP3590205B2/en
Publication of JPH1030696A publication Critical patent/JPH1030696A/en
Application granted granted Critical
Publication of JP3590205B2 publication Critical patent/JP3590205B2/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

Links

Classifications

    • 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
    • F16H7/0848—Means for varying tension of belts, ropes, or chains with means for impeding reverse motion
    • 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
    • F16H2007/0812—Fluid pressure
    • 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
    • F16H7/0848—Means for varying tension of belts, ropes, or chains with means for impeding reverse motion
    • F16H2007/0859—Check valves
    • 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)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Devices For Conveying Motion By Means Of Endless Flexible Members (AREA)

Abstract

PROBLEM TO BE SOLVED: To provide a chain tensioner assembly of which is facilitated. SOLUTION: A forward backward movement member 6 and a spring 7 to externally press the forward backward movement member 6 are incorporated in the cylinder chamber 5 of a housing 1 locked at a cylinder block by means of a bolt. A feed oil passage 9 is formed in the closed end wall of the cylinder chamber 5 and a check valve 10 is arranged at an oil outlet. A slipper 18 pressed by the forward backward movement 6 to stretch a chain A is oscillatively mounted around a bolt for mounting the housing 1 and mounting of the housing 1, the slipper 18 is also simultaneously mounted and assembly of a chain tensioner is facilitated.

Description

【発明の詳細な説明】DETAILED DESCRIPTION OF THE INVENTION

【０００１】[0001]

【発明の属する技術分野】この発明は、カム軸駆動用チ
ェーン等のチェーンの張力を一定に保持するチェーンテ
ンショナに関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a chain tensioner for maintaining a constant tension of a chain such as a camshaft driving chain.

【０００２】[0002]

【従来の技術】カム軸駆動用チェーンの張力を一定に保
つチェーンテンショナとして、図４に示したものが知ら
れている。このチェーンテンショナはハウジング３０に
形成されたシリンダ室３１内にプランジャ３２と、スプ
リング３３とを組込み、上記スプリング３３で突出性が
付与されたプランジャ３２によりチェーンＡを押圧する
ようにしている。2. Description of the Related Art FIG. 4 shows a known chain tensioner for keeping the tension of a camshaft driving chain constant. In this chain tensioner, a plunger 32 and a spring 33 are incorporated in a cylinder chamber 31 formed in a housing 30, and the chain A is pressed by the plunger 32 provided with the projecting property by the spring 33.

【０００３】また、プランジャ３２の背部に形成された
圧力室３４に給油通路３５を連通し、その給油通路３５
にチェックバルブ３６を設け、上記プランジャ３２が外
方向に移動して圧力室３４の圧力が低下したとき、チェ
ックバルブ３６を開放させ、給油ポンプの駆動により給
油通路３５から圧力室３４に油を流動させるようにして
いる。[0003] An oil supply passage 35 communicates with a pressure chamber 34 formed at the back of the plunger 32.
When the plunger 32 moves outward and the pressure in the pressure chamber 34 decreases, the check valve 36 is opened, and the oil supply pump drives the oil to flow oil from the oil supply passage 35 to the pressure chamber 34. I try to make it.

【０００４】上記チェーンテンショナにおいては、エン
ジンの停止により、チェーンＡが緊張してプランジャ３
２に押し込み力が作用すると、その押し込み力は圧力室
３４に封入された油によって緩衝される。また、チェー
ンＡに弛みが生じると、スプリング３３の弾力によりプ
ランジャ３２が急速に外方向に移動してチェーンＡを緊
張させる。このため、チェーンＡの張力変動に対するプ
ランジャ３２の追従性が良好であり、チェーンＡの張力
を常に一定に保持することができるという特徴を有す
る。In the above-described chain tensioner, when the engine is stopped, the chain A becomes tense and the plunger 3
When a pushing force acts on 2, the pushing force is buffered by the oil sealed in the pressure chamber 34. Further, when the chain A is loosened, the plunger 32 is rapidly moved outward by the elasticity of the spring 33 to tension the chain A. Therefore, the plunger 32 has good followability with respect to the tension fluctuation of the chain A, and the tension of the chain A can always be kept constant.

【０００５】[0005]

【発明が解決しようとする課題】ところで、上記チェー
ンテンショナにおいては、チェーンＡの移動を案内する
スリッパ３７の併用においてチェーンＡの張力を調整す
る必要があり、従来は、そのスリッパ３７がチェーンテ
ンショナに対して非連結の構造であるため、組付けに際
しては、チェーンテンショナとスリッパ３７とを、相対
的な位置関係を保って別々に組付ける必要がある。この
ため、組付けに非常に手間がかかる問題がある。In the above-mentioned chain tensioner, it is necessary to adjust the tension of the chain A when using the slipper 37 for guiding the movement of the chain A. Conventionally, the slipper 37 is attached to the chain tensioner. On the other hand, the chain tensioner and the slipper 37 need to be separately assembled while maintaining a relative positional relationship. For this reason, there is a problem that the assembling is very troublesome.

【０００６】この発明の課題は、組付けの容易なチェー
ンテンショナを提供することである。An object of the present invention is to provide a chain tensioner that can be easily assembled.

【０００７】[0007]

【課題を解決するための手段】上記の課題を解決するた
めに、この発明においては、ハウジングに形成されたシ
リンダ室内に、そのシリンダ室の内径面に沿って摺動自
在の進退部材と、その進退部材を外方向に押圧するスプ
リングとを組込み、前記進退部材の外方向への移動時
に、その進退部材で押圧されるチェーン押圧用のスリッ
パをハウジングに揺動自在に取付けた構成を採用してい
る。In order to solve the above-mentioned problems, according to the present invention, an advancing / retracting member slidable along an inner diameter surface of a cylinder chamber in a cylinder chamber formed in a housing; A spring that pushes the reciprocating member outward is incorporated, and when the reciprocating member is moved outward, a chain pressing slipper pressed by the reciprocating member is swingably attached to the housing. I have.

【０００８】ここで、スリッパの揺動支点軸はハウジン
グを取付ける固定軸としてもよい。また、進退部材は、
シリンダ室の開口部に設けたねじ孔にねじ係合されるね
じ軸と、そのねじ軸の背部に設けられたプランジャとか
ら成るものであってもよい。この場合、ねじ孔とねじ軸
の外周のねじ山を、ねじ軸の押し込み力を受ける圧力側
フランクのフランク角が遊び側フランクのフランク角よ
り小さい鋸歯状とし、その鋸歯状ねじ山に前記スプリン
グの押圧力によってねじ軸が外方向に移動するリード角
を設けるようにする。Here, the swing fulcrum shaft of the slipper may be a fixed shaft for mounting the housing. In addition, the reciprocating member,
It may be composed of a screw shaft screwed into a screw hole provided in the opening of the cylinder chamber, and a plunger provided on the back of the screw shaft. In this case, the screw hole and the thread on the outer periphery of the screw shaft are formed into a sawtooth shape in which the flank angle of the pressure side flank receiving the pushing force of the screw shaft is smaller than the flank angle of the play side flank. The lead angle at which the screw shaft moves outward by the pressing force is provided.

【０００９】[0009]

【発明の実施の形態】以下、この発明の実施の形態を図
１乃至図３に基づいて説明する。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS.

【００１０】図１に示すように、ハウジング１は複数の
取付片２を外周に有し、各取付片２は、図２に示すよう
に、エンジンのシリンダブロック３にねじ込まれるボル
ト４の締付けによって固定される。As shown in FIG. 1, the housing 1 has a plurality of mounting pieces 2 on its outer periphery. Each mounting piece 2 is tightened by a bolt 4 screwed into a cylinder block 3 of the engine as shown in FIG. Fixed.

【００１１】また、ハウジング１には先端面で開口する
シリンダ室５が形成され、そのシリンダ室５内に、その
シリンダ室５の内径面に沿って摺動自在の進退部材６
と、スプリング７とが組込まれ、上記スプリング７によ
って進退部材６は外方向に突出性が付与されている。A cylinder chamber 5 is formed in the housing 1 and has an opening at the tip end. The cylinder chamber 5 has an advancing and retreating member 6 slidable along the inner diameter of the cylinder chamber 5.
, And a spring 7, and the reciprocating member 6 is provided with an outwardly projecting property by the spring 7.

【００１２】シリンダ室５の閉塞端壁には、進退部材６
の背部に形成された圧力室８と連通する給油通路９が形
成されている。給油通路９の油出口に設けられたチェッ
クバルブ１０は、圧力室８内の圧力が給油通路９内の圧
力より高くなると、給油通路９を閉じ、給油通路９から
圧力室８への油の流入を阻止する。An advancing / retreating member 6 is provided on the closed end wall of the cylinder chamber 5.
An oil supply passage 9 communicating with a pressure chamber 8 formed at the back of the fuel tank is formed. The check valve 10 provided at the oil outlet of the oil supply passage 9 closes the oil supply passage 9 when the pressure in the pressure chamber 8 becomes higher than the pressure in the oil supply passage 9, and flows the oil from the oil supply passage 9 into the pressure chamber 8. To block.

【００１３】前記進退部材６は、ねじ軸１１と、そのね
じ軸１１の背部に組込まれたプランジャ１２とから成
り、プランジャ１２にはねじ軸１１の後端面と点接触す
る球形先端面１３が設けられている。The reciprocating member 6 comprises a screw shaft 11 and a plunger 12 mounted on the back of the screw shaft 11. The plunger 12 is provided with a spherical tip surface 13 which makes point contact with the rear end surface of the screw shaft 11. Have been.

【００１４】ねじ軸１１は、シリンダ室５の開口部に圧
入されたナット部材１４のねじ孔１５とねじ係合してい
る。図３に示すように、ねじ軸１１とねじ孔１５のねじ
山は、ねじ軸１１の押し込み力を受ける圧力側フランク
１６のフランク角が遊び側フランク１７のフランク角よ
り大きい鋸歯状とされ、その鋸歯状ねじ山のフランクと
リード角の関係から、ねじ軸１１は外方向に弛み条件と
され、押し込み方向にロック条件とされている。The screw shaft 11 is screw-engaged with a screw hole 15 of a nut member 14 press-fitted into the opening of the cylinder chamber 5. As shown in FIG. 3, the thread of the screw shaft 11 and the screw hole 15 has a sawtooth shape in which the flank angle of the pressure side flank 16 receiving the pushing force of the screw shaft 11 is larger than the flank angle of the play side flank 17. From the relationship between the flank and the lead angle of the serrated screw thread, the screw shaft 11 is set to the slack condition in the outward direction and the lock condition in the pushing direction.

【００１５】ここで、弛み条件とは、スプリング７の押
圧力によってねじ軸１１が回転しつつ外方向にスムーズ
に移動することをいう。一方、ロック条件とは、ねじ軸
１１が押し込まれても軸方向に移動せず、また、チェー
ンの振動がねじ軸１１に作用したとき、ねじ係合部のね
じ山間に形成された軸方向すきま分だけ間歇的に当接、
離反を繰り返し、接触するねじ山の２つのフランク面間
の相対ねじ運動を瞬間的にロックすることなく、ねじ軸
１１は少しずつ間歇的に回転を続けて、押し込み力とス
プリング７の付勢力とが均衡する位置までねじ軸１１が
シリンダ室５内にゆっくりと移動することをいう。Here, the slack condition means that the screw shaft 11 is smoothly moved outward while rotating by the pressing force of the spring 7. On the other hand, the locking condition means that when the screw shaft 11 is pushed in, it does not move in the axial direction, and when vibration of the chain acts on the screw shaft 11, an axial clearance formed between the threads of the screw engaging portion is formed. Abuts intermittently for minutes,
The screw shaft 11 continues to rotate little by little intermittently without instantaneously locking the relative screw motion between the two flank surfaces of the contacting thread, repeating the separation, and the pushing force and the urging force of the spring 7 Means that the screw shaft 11 moves slowly into the cylinder chamber 5 to a position where the pressures are balanced.

【００１６】上記ねじ軸１１の前側にはチェーン押圧用
の弧状のスリッパ１８が設けられている。スリッパ１８
は合成樹脂等の滑り性の良好な材料から形成され、その
一端部は取付片２の固定用ボルト４を中心に揺動自在に
支持され、長さ方向中途に設けた球形突部１９がねじ軸
１１の先端面と対向している。An arc-shaped slipper 18 for pressing a chain is provided on the front side of the screw shaft 11. Slippers 18
Is formed of a material having good slipperiness such as a synthetic resin, and one end thereof is swingably supported around the fixing bolt 4 of the mounting piece 2, and a spherical projection 19 provided in the middle in the length direction has a screw. It faces the tip end surface of the shaft 11.

【００１７】上記のように、チェーン押圧用スリッパ１
８をハウジング１に対して揺動自在に連結したことによ
り、シリンダブロック３に対してハウジング１を取付け
ることによって、スリッパ１８も同時に取付けられ、チ
ェーンテンショナの組付け性の向上を図ることができ
る。As described above, the chain pressing slipper 1
Since the housing 8 is swingably connected to the housing 1, by mounting the housing 1 to the cylinder block 3, the slipper 18 is also mounted at the same time, and the assembling property of the chain tensioner can be improved.

【００１８】図１に示すようなチェーンテンショナの組
付け状態において、エンジンの回転数の変動によってチ
ェーンＡに弛みが生じると、スプリング７の押圧力によ
り、ねじ軸１１は回転しつつ外方向に移動する。このと
き、ねじ軸１１とナット部材１４に形成されたねじ孔１
５のねじ山の遊び側フランク１７のフランク角とリード
角の関係からねじ軸１１は突出方向に弛み条件とされて
いるため、ねじ軸１１はスムーズに回転して外方向に素
速く移動し、その移動によってチェーンＡの弛みは吸収
される。In the assembled state of the chain tensioner as shown in FIG. 1, if the chain A becomes slack due to a change in the number of revolutions of the engine, the pressing force of the spring 7 causes the screw shaft 11 to move outward while rotating. I do. At this time, screw holes 1 formed in screw shaft 11 and nut member 14 are formed.
Since the screw shaft 11 is slackened in the protruding direction from the relationship between the flank angle of the play-side flank 17 and the lead angle of the screw thread No. 5, the screw shaft 11 rotates smoothly and moves quickly outward. The slack of the chain A is absorbed by the movement.

【００１９】ねじ軸１１の外方向への移動時、プランジ
ャ１２はねじ軸１１と共に外方向に移動し、その移動に
よって圧力室８内の圧力が給油通路９内の圧力より低下
するため、チェックバルブ１０が給油通路９を開放し、
その給油通路９から圧力室８に油が供給される。When the screw shaft 11 moves outward, the plunger 12 moves outward together with the screw shaft 11, and the movement causes the pressure in the pressure chamber 8 to be lower than the pressure in the oil supply passage 9. 10 opens the refueling passage 9,
Oil is supplied to the pressure chamber 8 from the oil supply passage 9.

【００２０】また、チェーンＡからの振動がねじ軸１１
に作用し、ねじ軸１１に付与される押し込み力がスプリ
ング７の押圧力より大きい場合、ねじ軸１１は押し込み
力とスプリング７の押圧力とが釣り合う位置までゆっく
りと後退動する。The vibration from the chain A is applied to the screw shaft 11
When the pushing force applied to the screw shaft 11 is greater than the pressing force of the spring 7, the screw shaft 11 slowly moves backward to a position where the pushing force and the pressing force of the spring 7 are balanced.

【００２１】このとき、圧力室８の圧力が給油通路９内
の圧力より高くなるため、チェックバルブ１０は給油通
路９を閉じ、圧力室８内の油はプランジャ１２とシリン
ダ室５の摺動面間およびねじ軸１１とねじ孔１５のねじ
係合面間の隙間から外部にリークする。At this time, since the pressure in the pressure chamber 8 becomes higher than the pressure in the oil supply passage 9, the check valve 10 closes the oil supply passage 9, and the oil in the pressure chamber 8 slides between the plunger 12 and the cylinder chamber 5. Leakage to the outside through the gap between the screw shaft 11 and the screw engagement surface of the screw hole 15.

【００２２】エンジンが停止し、カム軸に設けられたカ
ムの停止位置の関係からチェーンＡが緊張してねじ軸１
１が押し込まれると、その押し込み力は、ねじ軸１１と
ねじ孔１５のねじ山における圧力側フランク１６で受け
られる。その圧力側フランク１６のフランク角とリード
角の関係からねじ軸１１は押し込み方向にロック条件と
されているため、ねじ軸１１は、ロックして後退しな
い。When the engine is stopped and the chain A is tightened due to the stop position of the cam provided on the camshaft, the screw shaft 1
When 1 is pushed in, the pushing force is received by the screw shaft 11 and the pressure side flank 16 in the thread of the screw hole 15. Since the screw shaft 11 is locked in the pushing direction from the relationship between the flank angle and the lead angle of the pressure side flank 16, the screw shaft 11 is locked and does not retreat.

【００２３】上記のように、エンジンの停止によってチ
ェーンＡが緊張してもねじ軸１１は後退しないため、エ
ンジンの停止後、エンジンが再始動されてチェーンＡに
弛みが生じても、ねじ軸１１の突出量は少なく、圧力室
８の圧力の低下も少ないため、圧力室８に空気が侵入
し、あるいは油中から空気が析出するという不都合の発
生はきわめて少ない。As described above, the screw shaft 11 does not retreat even if the chain A is tensioned due to the stop of the engine. Therefore, even if the engine is restarted and the chain A becomes slack after the engine is stopped, the screw shaft 11 Since the protrusion amount of the pressure chamber 8 is small and the pressure of the pressure chamber 8 does not decrease much, the inconvenience that air enters the pressure chamber 8 or air is precipitated from the oil is extremely small.

【００２４】なお、低温始動時、油の粘性が高く、圧力
室８への油の流入が悪いが、この場合でもねじ軸１１の
突出量が小さいため、圧力室８に空気が侵入し、あるい
は油中から空気が析出するのを防止することができる。At a low temperature start, the viscosity of the oil is high and the flow of the oil into the pressure chamber 8 is poor. However, even in this case, since the amount of protrusion of the screw shaft 11 is small, air enters the pressure chamber 8 or Precipitation of air from oil can be prevented.

【００２５】発明の実施の形態においては、進退部材６
として、ねじ軸１１とプランジャ１２とから成るものを
示したが、上記進退部材６はプランジャ単体から成るも
のであってもよい。In the embodiment of the invention, the reciprocating member 6
Although the above-described configuration includes the screw shaft 11 and the plunger 12, the reciprocating member 6 may be configured as a single plunger.

【００２６】[0026]

【発明の効果】以上のように、この発明においては、進
退部材によって押圧されるチェーン押圧用のスリッパを
ハウジングに揺動自在に連結したので、ハウジングとス
リッパとを個々に取付ける必要がなくなり、チェーンテ
ンショナの組付け性の向上を図ることができる。As described above, according to the present invention, since the chain pressing slipper pressed by the advancing / retracting member is swingably connected to the housing, it is not necessary to individually mount the housing and the slipper, and the chain is not required. The assemblability of the tensioner can be improved.

【００２７】また、進退部材をねじ軸とプランジャとで
形成し、シリンダ室の開口部には上記ねじ軸とねじ係合
するねじ孔を設け、そのねじ軸とねじ孔のねじ山をねじ
軸の押し込み力を受ける圧力側フランクのフランク角が
遊び側フランクのフランク角より大きい鋸歯状としてね
じ軸を突出方向に弛み条件とし、押し込み方向にロック
条件としたことにより、エンジンの再始動時にチェーン
に弛みが生じても摺動部材が外方向に大きく移動せず、
圧力室への空気の侵入および油中から空気が析出するの
を防止することができる。Further, the reciprocating member is formed by a screw shaft and a plunger, and a screw hole is formed in the opening of the cylinder chamber so as to be screwed with the screw shaft. The flank angle of the pressure-side flank receiving the pushing force is larger than the flank angle of the play-side flank, and the chain is slackened when the engine is restarted. Even if the sliding occurs, the sliding member does not largely move outward,
It is possible to prevent entry of air into the pressure chamber and precipitation of air from oil.

【００２８】さらに、チェーンの張力変動時、ねじ軸が
ねじ運動し、かつプランジャが摺動するだけであるた
め、異音の発生が少なく、しかも、ねじ軸とねじ孔のね
じ係合部で圧力を受けるため、耐久性に優れたチェーン
テンショナを提供することができる。Further, when the tension of the chain fluctuates, since the screw shaft only makes a screw motion and the plunger slides, the generation of abnormal noise is small, and the pressure at the screw engaging portion between the screw shaft and the screw hole is reduced. Therefore, a chain tensioner having excellent durability can be provided.

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

【図１】この発明に係るチェーンテンショナの断面図FIG. 1 is a cross-sectional view of a chain tensioner according to the present invention.

【図２】図１のII−II線に沿った断面図FIG. 2 is a sectional view taken along the line II-II in FIG.

【図３】同上のねじ軸とねじ孔のねじ係合部における拡
大断面図FIG. 3 is an enlarged cross-sectional view of a screw shaft and a screw hole of the screw engaging portion.

【図４】従来のチェーンテンショナを示す断面図FIG. 4 is a sectional view showing a conventional chain tensioner.

【符号の説明】 １ ハウジング ５ シリンダ室 ６ 進退部材 ７ スプリング ８ 圧力室 ９ 給油通路 １０ チェックバルブ １１ ねじ軸 １２ プランジャ １４ ナット部材 １５ ねじ孔 １６ 圧力側フランク １７ 遊び側フランク １８ スリッパ[Description of Signs] 1 Housing 5 Cylinder chamber 6 Reciprocating member 7 Spring 8 Pressure chamber 9 Oil supply passage 10 Check valve 11 Screw shaft 12 Plunger 14 Nut member 15 Screw hole 16 Pressure side flank 17 Play side flank 18 Slipper

Claims (4)

【特許請求の範囲】[Claims] 【請求項１】 ハウジングに形成されたシリンダ室内
に、そのシリンダ室の内径面に沿って摺動自在の進退部
材と、その進退部材を外方向に押圧するスプリングとを
組込み、前記進退部材の外方向への移動時に、その進退
部材で押圧されるチェーン押圧用のスリッパをハウジン
グに揺動自在に取付けたチェーンテンショナ。1. A reciprocating member slidable along an inner diameter surface of a cylinder chamber and a spring for pressing the reciprocating member outward are incorporated in a cylinder chamber formed in a housing. A chain tensioner in which a slipper for pressing a chain pressed by an advancing and retreating member is swingably attached to a housing when moving in a direction. 【請求項２】 前記スリッパの揺動支点軸を、ハウジン
グ取付け用の固定軸とした請求項１に記載のチェーンテ
ンショナ。2. The chain tensioner according to claim 1, wherein the pivot shaft of the slipper is a fixed shaft for mounting the housing. 【請求項３】 前記シリンダ室の閉塞端壁に、前記進退
部材の背部に形成された圧力室と連通する給油通路を設
け、その給油通路の油出口に、圧力室内の圧力が給油通
路内の圧力より高くなると、その給油通路を閉じるチェ
ックバルブを設けた請求項１又は２に記載のチェーンテ
ンショナ。3. An oil supply passage communicating with a pressure chamber formed at the back of the advance / retreat member is provided at a closed end wall of the cylinder chamber, and an oil outlet of the oil supply passage has a pressure in the pressure chamber within the oil supply passage. 3. The chain tensioner according to claim 1, further comprising a check valve for closing the oil supply passage when the pressure becomes higher than the pressure. 【請求項４】 前記進退部材が、シリンダ室の開口部に
設けたねじ孔にねじ係合されたねじ軸と、そのねじ軸の
背部に設けられたプランジャとから成り、ねじ孔とねじ
軸の外周のねじ山を、ねじ軸の押し込み力を受ける圧力
側フランクのフランク角が遊び側フランクのフランク角
より大きい鋸歯状とし、その鋸歯状ねじ山に前記スプリ
ングの押圧力によってねじ軸が外方向に移動するリード
角を設けた請求項１乃至３のいずれ１つに記載のチェー
ンテンショナ。4. The reciprocating member includes a screw shaft screw-engaged with a screw hole provided in an opening of the cylinder chamber, and a plunger provided on the back of the screw shaft. The outer peripheral thread has a sawtooth shape in which the flank angle of the pressure side flank receiving the pushing force of the screw shaft is larger than the flank angle of the play side flank. The chain tensioner according to any one of claims 1 to 3, wherein a moving lead angle is provided.
JP18921696A 1996-07-18 1996-07-18 Chain tensioner Expired - Fee Related JP3590205B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP18921696A JP3590205B2 (en) 1996-07-18 1996-07-18 Chain tensioner

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP18921696A JP3590205B2 (en) 1996-07-18 1996-07-18 Chain tensioner

Publications (2)

Publication Number Publication Date
JPH1030696A true JPH1030696A (en) 1998-02-03
JP3590205B2 JP3590205B2 (en) 2004-11-17

Family

ID=16237511

Family Applications (1)

Application Number Title Priority Date Filing Date
JP18921696A Expired - Fee Related JP3590205B2 (en) 1996-07-18 1996-07-18 Chain tensioner

Country Status (1)

Country Link
JP (1) JP3590205B2 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103363044A (en) * 2012-03-28 2013-10-23 株式会社椿本链条 Hydraulic tensioner

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103363044A (en) * 2012-03-28 2013-10-23 株式会社椿本链条 Hydraulic tensioner

Also Published As

Publication number Publication date
JP3590205B2 (en) 2004-11-17

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