JP3590205B2 - Chain tensioner - Google Patents

Chain tensioner Download PDF

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Publication number
JP3590205B2
JP3590205B2 JP18921696A JP18921696A JP3590205B2 JP 3590205 B2 JP3590205 B2 JP 3590205B2 JP 18921696 A JP18921696 A JP 18921696A JP 18921696 A JP18921696 A JP 18921696A JP 3590205 B2 JP3590205 B2 JP 3590205B2
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Japan
Prior art keywords
pressure
chain
screw shaft
supply passage
oil supply
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Expired - Fee Related
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JP18921696A
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Japanese (ja)
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JPH1030696A (en
Inventor
智善 井筒
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NTN Corp
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NTN Corp
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    • 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

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

Description

【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。
【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。
【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。
【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３２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。
【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。
【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。
【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、前記進退部材が、その進退部材に負荷される押し込み力を受ける圧力側フランクのフランク角を遊び側フランクのフランク角より大きくした鋸歯状ねじを有し、その鋸歯状ねじに前記スプリングの押圧力によってプランジャが外方向に移動するリード角を設けた構成を採用している。
【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。
【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。
【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。
【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。
【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。
【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。
【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。
【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。
【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。
【００１７】
上記のように、チェーン押圧用スリッパ１８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。
【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１５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。
【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。
【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。
【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。
【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１１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。
【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。
【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。
【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。
【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。
【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。
【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。
【図面の簡単な説明】
【図１】この発明に係るチェーンテンショナの断面図
【図２】図１のＩＩ−ＩＩ線に沿った断面図
【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
【図４】従来のチェーンテンショナを示す断面図
【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[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a chain tensioner that keeps the tension of a chain such as a camshaft driving chain constant.
[0002]
[Prior art]
FIG. 4 shows a known chain tensioner that keeps 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]
An oil supply passage 35 communicates with a pressure chamber 34 formed at the back of the plunger 32, and a check valve 36 is provided in the oil supply passage 35. The plunger 32 moves outward and the pressure in the pressure chamber 34 decreases. At this time, the check valve 36 is opened, and oil is caused to flow from the oil supply passage 35 to the pressure chamber 34 by driving the oil supply pump.
[0004]
In the chain tensioner, when the engine is stopped and the chain A is tensed to apply a pushing force to the plunger 32, the pushing force is buffered by the oil sealed in the pressure chamber. Further, when the chain A becomes loose, the plunger 32 rapidly moves outward due to the elasticity of the spring 33 to tension the chain A. Therefore, the plunger 32 has good followability with respect to the fluctuation in the tension of the chain A, and the tension of the chain A can always be kept constant.
[0005]
[Problems to be solved by the invention]
By the way, in the above-mentioned chain tensioner, it is necessary to adjust the tension of the chain A in combination with the slipper 37 for guiding the movement of the chain A. Conventionally, the slipper 37 has a structure that is not connected to the chain tensioner. When assembling, it is necessary to separately assemble the chain tensioner and the slipper 37 while maintaining a relative positional relationship. For this reason, there is a problem that it takes a lot of time to assemble.
[0006]
An object of the present invention is to provide a chain tensioner that can be easily assembled.
[0007]
[Means for Solving the Problems]
In order to solve the above-mentioned problems, according to the present invention, a reciprocating member slidable along an inner diameter surface of a cylinder chamber in a cylinder chamber formed in a housing, and a spring for urging the reciprocating member outward. When the reciprocating member moves outward, a chain pressing slipper pressed by the reciprocating member is swingably attached to the housing, and the reciprocating member applies a pushing force applied to the reciprocating member. The flank angle of the pressure-side flank receiving the flank is larger than the flank angle of the play-side flank, and a lead angle at which the plunger is moved outward by the pressing force of the spring is provided on the saw-shaped screw. Has adopted.
[0008]
Here, the swing fulcrum shaft of the slipper may be a fixed shaft for mounting the housing. The advancing / retreating member may include a screw shaft engaged with 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 circumference of the screw shaft are formed in 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. A lead angle at which the screw shaft moves outward by the pressing force is provided.
[0009]
BEST MODE FOR CARRYING OUT THE INVENTION
An embodiment of the present invention will be described below with reference to FIGS.
[0010]
As shown in FIG. 1, the housing 1 has a plurality of mounting pieces 2 on its outer periphery, and each mounting piece 2 is fixed by tightening a bolt 4 screwed into a cylinder block 3 of the engine as shown in FIG. .
[0011]
A cylinder chamber 5 is formed in the housing 1 and has an opening at the distal end surface. In the cylinder chamber 5, a reciprocating member 6 slidable along the inner diameter surface of the cylinder chamber 5 and a spring 7 are incorporated. The reciprocating member 6 is provided with an outward projecting property by the spring 7.
[0012]
An oil supply passage 9 is formed in the closed end wall of the cylinder chamber 5 and communicates with a pressure chamber 8 formed at the back of the advance / retreat member 6. 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]
The reciprocating member 6 includes a screw shaft 11 and a plunger 12 incorporated in the back of the screw shaft 11. The plunger 12 is provided with a spherical tip surface 13 that makes point contact with the rear end surface of the screw shaft 11. .
[0014]
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 thread, the screw shaft 11 is set to the slack condition in the outward direction and the lock condition in the pushing direction.
[0015]
Here, the loosening condition means that the screw shaft 11 smoothly moves 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 the vibration of the chain acts on the screw shaft 11, the axial clearance formed between the threads of the screw engagement portion. The screw shaft 11 is rotated intermittently little by little without intermittently locking the relative screw movement between the two flank surfaces of the screw threads that contact each other, repeating the contacting and separating steps intermittently. This means that the screw shaft 11 slowly moves into the cylinder chamber 5 to a position where the force and the urging force of the spring 7 are balanced.
[0016]
An arc-shaped slipper 18 for pressing the chain is provided on the front side of the screw shaft 11. The slipper 18 is made of a material having good slipperiness such as a synthetic resin. One end of the slipper 18 is swingably supported around the fixing bolt 4 of the mounting piece 2 and has a spherical projection 19 provided in the middle in the longitudinal direction. Faces the distal end surface of the screw shaft 11.
[0017]
As described above, by connecting the chain pressing slipper 18 to the housing 1 so as to swing freely, by mounting the housing 1 to the cylinder block 3, the slipper 18 is also mounted at the same time, and the chain tensioner is assembled. Performance can be improved.
[0018]
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 rotations of the engine, the screw shaft 11 moves outward while rotating by the pressing force of the spring 7. At this time, the screw shaft 11 is slackened in the projecting direction from the relationship between the flank angle and the lead angle of the play-side flank 17 of the screw thread of the screw hole 15 formed in the screw shaft 11 and the nut member 14. The shaft 11 rotates smoothly and moves quickly outward, and the slack of the chain A is absorbed by the movement.
[0019]
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. The passage 9 is opened, and oil is supplied to the pressure chamber 8 from the oil supply passage 9.
[0020]
When the vibration from the chain A acts on the screw shaft 11 and the pushing force applied to the screw shaft 11 is larger than the pressing force of the spring 7, the screw shaft 11 is located at a position where the pushing force and the pressing force of the spring 7 are balanced. Retreat slowly until
[0021]
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 flows between the sliding surface between the plunger 12 and the cylinder chamber 5 and the screw. It leaks outside through a gap between the shaft 11 and the screw engagement surface of the screw hole 15.
[0022]
When the engine is stopped and the chain A is tensioned and the screw shaft 11 is pushed in due to the stop position of the cam provided on the cam shaft, the pushing force is applied to the pressure side of the screw thread of the screw shaft 11 and the screw hole 15. Received at Frank 16. Since the screw shaft 11 is locked in the pushing direction from the relationship between the flank angle of the pressure side flank 16 and the lead angle, the screw shaft 11 is locked and does not retreat.
[0023]
As described above, since the screw shaft 11 does not retreat even when the chain A is tensioned due to the stop of the engine, even if the engine is restarted and the chain A becomes slack after the engine is stopped, the projecting amount of the screw shaft 11 Since the pressure in the pressure chamber 8 does not drop much, the inconvenience that air enters the pressure chamber 8 or air precipitates out of the oil is extremely small.
[0024]
In addition, at the time of low-temperature start-up, the viscosity of the oil is high and the inflow of the oil into the pressure chamber 8 is poor, but even in this case, since the amount of protrusion of the screw shaft 11 is small, air enters the pressure chamber 8 or The deposition of air can be prevented.
[0025]
In the embodiment of the present invention, the advance / retreat member 6 includes the screw shaft 11 and the plunger 12, but the advance / retreat member 6 may include a single plunger.
[0026]
【The invention's effect】
As described above, in the present invention, the chain pressing slipper pressed by the reciprocating member is swingably connected to the housing, so that it is not necessary to individually mount the housing and the slipper, and the chain tensioner can be easily assembled. Can be improved.
[0027]
Also, 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 to engage with the screw shaft, and the thread of the screw shaft and the screw hole is used to reduce the pushing force of the screw shaft. The flank angle of the pressure side flank is larger than the flank angle of the play side flank, and the screw shaft is set to the slack condition in the projecting direction and the locking condition in the pushing direction. Also, the sliding member does not largely move outward, so that it is possible to prevent entry of air into the pressure chamber and precipitation of air from the oil.
[0028]
Furthermore, when the tension of the chain fluctuates, the screw shaft only makes a screw motion and the plunger slides, so that there is little noise and the pressure is applied to the screw engaging part between the screw shaft and the screw hole. Thus, a chain tensioner having excellent durability can be provided.
[Brief description of the drawings]
FIG. 1 is a cross-sectional view of a chain tensioner according to the present invention. FIG. 2 is a cross-sectional view taken along the line II-II of FIG. 1. FIG. 3 is an enlarged cross-sectional view of a screw shaft and a screw hole of the same. FIG. 4 is a cross-sectional view showing a conventional chain tensioner.
REFERENCE SIGNS LIST 1 housing 5 cylinder chamber 6 advance / retreat 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)

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、前記進退部材が、その進退部材に負荷される押し込み力を受ける圧力側フランクのフランク角を遊び側フランクのフランク角より大きくした鋸歯状ねじを有し、その鋸歯状ねじに前記スプリングの押圧力によってプランジャが外方向に移動するリード角を設けたチェーンテンショナ。In the cylinder chamber formed in the housing, a reciprocating member slidable along the inner diameter surface of the cylinder chamber and a spring for pressing the reciprocating member outward are incorporated, and when the reciprocating member moves outward, A chain pressing slipper pressed by the advance / retreat member is swingably attached to the housing, and the advance / retreat member changes the flank angle of the pressure-side flank to receive the pushing force applied to the advance / retreat member by the flank of the play-side flank. A chain tensioner having a serrated screw having a larger angle than the angle, and having a lead angle at which the plunger moves outward by a pressing force of the spring . 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。The chain tensioner according to claim 1, wherein the swing fulcrum shaft of the slipper is a fixed shaft for mounting the housing. 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。On the closed end wall of the cylinder chamber, an oil supply passage communicating with the pressure chamber formed at the back of the advance / retreat member is provided, and at the oil outlet of the oil supply passage, when the pressure in the pressure chamber becomes higher than the pressure in the oil supply passage, 3. The chain tensioner according to claim 1, further comprising a check valve for closing the oil supply passage. 前記鋸歯状ねじを進退部材の外周とシリンダ室の開口部内周の相互間に設けた請求項１乃至３のいずれかに記載のチェーンテンショナ。The chain tensioner according to any one of claims 1 to 3, wherein the serrated screw is provided between an outer periphery of the advance / retreat member and an inner periphery of the opening of the cylinder chamber .
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 JPH1030696A (en) 1998-02-03
JP3590205B2 true JP3590205B2 (en) 2004-11-17

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2013204690A (en) * 2012-03-28 2013-10-07 Tsubakimoto Chain Co Hydraulic tensioner

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