JP4754220B2 - Structure to prevent foreign matter from entering the chain tensioner - Google Patents

Structure to prevent foreign matter from entering the chain tensioner Download PDF

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JP4754220B2
JP4754220B2 JP2005000113A JP2005000113A JP4754220B2 JP 4754220 B2 JP4754220 B2 JP 4754220B2 JP 2005000113 A JP2005000113 A JP 2005000113A JP 2005000113 A JP2005000113 A JP 2005000113A JP 4754220 B2 JP4754220 B2 JP 4754220B2
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chain
pressure
plunger
pressure chamber
tensioner
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JP2006189072A (en
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誠二 佐藤
聡 北野
久 早川
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NTN Corp
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NTN Corp
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Priority to EP05025259.2A priority patent/EP1662175B1/en
Priority to US11/283,751 priority patent/US20060116229A1/en
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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
    • F16H2007/0802—Actuators for final output members
    • F16H2007/0812—Fluid pressure
    • F16H2007/0814—Fluid pressure with valves opening on surplus pressure

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  • Devices For Conveying Motion By Means Of Endless Flexible Members (AREA)

Description

この発明は、エンジンのカムを駆動するチェーンシステムの張力を一定に保持するチェーンテンショナにおける作動油の流路への異物の流入を防止するチェーンテンショナの異物流入防止構造に関する。   The present invention relates to a foreign matter inflow prevention structure for a chain tensioner that prevents foreign matter from flowing into a flow path of hydraulic fluid in a chain tensioner that maintains a constant tension of a chain system that drives an engine cam.

エンジンのカムシャフト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及びチェーンシステムの一例として特許文献１に記載のものが公知である。この文献１に記載されたチェーンテンショナは、ハウジングの圧力室にチェーン押圧用のロッド部材の後端部を挿入し、そのロッド部材に外方向への突出性を張力調整ばねにより付与し、チェーンからロッド部材を介して負荷される静荷重によるロッド部材の後退動を阻止するねじ係合手段を備えている。   As an example of a chain tensioner and a chain system that keeps the tension of a camshaft drive chain of an engine constant, one described in Patent Document 1 is known. The chain tensioner described in this document 1 inserts a rear end portion of a chain pressing rod member into a pressure chamber of a housing, and imparts outward protrusion to the rod member by a tension adjustment spring. Screw engaging means for preventing the rod member from retreating due to a static load applied through the rod member is provided.

ロッド部材のプランジャは、開口端側内径面に設けた鋸歯ねじ部と、プランジャ内部でプランジャと相反する方向にスプリングで付勢され外径部に鋸歯ねじを設けたロッドと噛み合っており、両者の相対回転によりプランジャは突出方向には容易に突出し、逆方向には押し込まれ難い構造としている。このような構成のチェーンテンショナは、プランジャが外方向に移動して圧力室の圧力が低下すると、外部の給油ポンプから給油通路を経て圧力室に油を供給するようになっている。このため、ロッドの鋸歯ねじ面に異物を噛込むことがあり、プランジャ、ねじロッドの作動性が阻害されることがある。   The plunger of the rod member meshes with a sawtooth screw portion provided on the inner diameter surface on the open end side and a rod urged by a spring in the direction opposite to the plunger inside the plunger and provided with a sawtooth screw on the outer diameter portion. Due to the relative rotation, the plunger protrudes easily in the protruding direction and is difficult to be pushed in the opposite direction. In the chain tensioner having such a configuration, when the plunger moves outward and the pressure in the pressure chamber decreases, oil is supplied from the external oil pump to the pressure chamber through the oil supply passage. For this reason, a foreign object may be caught in the sawtooth thread surface of a rod, and the operability of a plunger and a screw rod may be inhibited.

又、チェーンテンショナの内部には、チェーンの振動を抑えるために、油圧ダンパ機構を内蔵しており、圧力室へのオイル流入を許容し、圧力室からオイルの逆流を防止するチェックバルブや、圧力室の圧力を適正圧力に調整するためのリリーフ弁を設けているため、上記バルブへの異物噛込みもチェーンテンショナのダンパ能力に影響を与える。
特開平１０−１３２０４０号公報 In addition, a hydraulic damper mechanism is built in the chain tensioner to suppress chain vibration, allowing oil to flow into the pressure chamber and preventing backflow of oil from the pressure chamber, Since a relief valve for adjusting the pressure in the chamber to an appropriate pressure is provided, foreign matter biting into the valve also affects the damper capacity of the chain tensioner.
JP-A-10-133204

この発明は、上記の問題に留意して、チェーンテンショナの内部構造に含まれる鋸歯ねじ面、チェックバルブ、リリーフ弁などの異物を噛込む可能性のある部位に異物が噛込まれるのを防止し、かつ作動油の流動抵抗に対する異物耐力以上のフィルタ部材により作動油の供給時に異物を除去し得るチェーンテンショナを提供することを課題とする。   In consideration of the above problems, the present invention prevents foreign matter from being caught in a portion of the chain tensioner internal structure that may cause foreign matter such as a saw-tooth thread surface, a check valve, and a relief valve. Another object of the present invention is to provide a chain tensioner that can remove foreign matter when supplying hydraulic oil by a filter member having a foreign matter resistance or more with respect to the flow resistance of the hydraulic oil.

この発明は、上記の課題を解決する手段として、ハウジングの一端面で開口する圧力室にチェーン押圧用のプランジャをスライド自在に挿入し、プランジャに外方向への突出性を付与する張力調整ばねと、チェーンからプランジャを介して負荷される荷重を受け、プランジャの後退動を鋸歯ねじを用いたねじ係合手段により阻止して衝撃を緩衝するダンパ機構とを備え、上記ハウジングの閉塞端側に連通して設けられる給油通路に所定範囲のメッシュサイズのフィルタ部材を設けたチェーンテンショナの異物流入防止構造としたのである。 As a means for solving the above-mentioned problem, the present invention provides a tension adjusting spring that slidably inserts a plunger for pressing a chain into a pressure chamber that opens at one end surface of a housing, and imparts outward protrusion to the plunger. A damper mechanism that receives a load applied from the chain through the plunger and prevents the plunger from retreating by a screw engaging means using a saw-tooth screw to buffer an impact, and communicates with the closed end side of the housing. than it was as foreign inflow preventing structure of a chain tensioner in which a filter member with a mesh size of Jo Tokoro range the oil supply passage provided in.

上記の構成としたこの発明のチェーンテンショナでは、ハウジング内のシリンダ室に供給される作動油はフィルタ部材により所定範囲内の粒径の異物を含む作動油のみが供給され、チェーンテンショナの作動に影響を及ぼすことなく、又作動油の流動抵抗も異物耐力以下に抑制されて作動する。このため、チェーンテンショナが異物を噛込んで作動を阻害されることがなく、フィルタ部材が耐力以下で損傷することもない。   In the chain tensioner of the present invention configured as described above, the hydraulic oil supplied to the cylinder chamber in the housing is supplied only with hydraulic oil containing foreign particles having a particle size within a predetermined range by the filter member, which affects the operation of the chain tensioner. In addition, the flow resistance of the hydraulic oil is also suppressed to be less than the foreign substance proof stress. For this reason, the chain tensioner does not interfere with the operation due to foreign matter being caught, and the filter member is not damaged below the yield strength.

チェーンテンショナとしての基本的な作動は、この種の従来のチェーンテンショナと同様であり、チェーンからの張力によりプランジャが急激に押込まれても鋸歯ねじによるねじ係合手段により阻止して衝撃を緩衝し、チェーンの張力が緩むとプランジャが張力調整ばねの張力により突出してチェーンの張力を強め、常にチェーンの張力を一定に保持するように作動する。   The basic operation of the chain tensioner is the same as that of a conventional chain tensioner of this type. Even if the plunger is suddenly pushed in due to the tension from the chain, it is blocked by the screw engaging means using a saw-tooth screw to buffer the impact. When the chain tension is loosened, the plunger protrudes by the tension of the tension adjusting spring to increase the chain tension, so that the chain tension is always kept constant.

このような作動を繰返している際に、この発明によるフィルタ部材を設けていなければ、エンジンから供給される作動油に粒径の大きい異物が混合してシリンダ室に流入し、ねじ係合手段や、チェックバルブ、リリーフ弁などに噛込まれて作動が阻害されることがあるからフィルタ部材はこのような粒径の異物を除去し、かつ流動抵抗もフィルタ部材の耐力限界以上となるメッシュサイズが選択されているため、フィルタ部材が耐力限界となることも防止される。   If the filter member according to the present invention is not provided when such an operation is repeated, foreign matter having a large particle size is mixed with the hydraulic oil supplied from the engine and flows into the cylinder chamber, and screw engagement means or Since the filter member may be trapped in a check valve, a relief valve, etc., and the operation may be hindered, the filter member has a mesh size that removes foreign matters having such a particle size and has a flow resistance that exceeds the proof stress limit of the filter member. Since it is selected, the filter member is also prevented from reaching the proof stress limit.

この発明のチェーンテンショナは、ハウジング内にプランジャと、張力調整ばねと、ねじ係合手段により衝撃を緩衝するダンパ機構とを備え、ハウジング閉塞端側の給油通路に設けた所定範囲のメッシュサイズのフィルタ部材で異物を除去するようにしたから、ハウジング内の作動部材に異物が噛込まれて作動が阻害されることがなく、かつ流動抵抗でフィルタ部材が耐力限界以下となることもなくきわめてスムーズで安定したチェーンテンショナの作動が確保されるという利点が得られる。 A chain tensioner according to the present invention includes a plunger, a tension adjusting spring, and a damper mechanism that cushions an impact by a screw engaging means in a housing, and a mesh size filter provided in a predetermined range in an oil supply passage on the housing closed end side. because was earthenware pots by removing foreign matters in member, without actuating foreign matter is written mesh is inhibited to the actuating member in the housing, and a very smooth without the filter member is less tolerance limit in flow resistance Thus, an advantage is obtained that a stable operation of the chain tensioner is ensured.

以下、この発明の実施の形態について図面を参照して説明する。図１はこの実施形態のチェーンテンショナを備えたチェーンシステムの全体概略図を示す。チェーンシステムは、エンジンのクランクシャフト１駆動用の軸端部に取付けられたスプロケット２の回転をチェーン３を介してカムシャフト４の軸端部に取付けられたスプロケット５に伝達される。チェーン３の弛み側チェーン３ａに接触させたスリッパ６は、軸７を中心として揺動自在に支持されている。このスリッパ６はチェーンテンショナ１０によってチェーン３が張る方向に押圧されている。   Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 shows an overall schematic view of a chain system including a chain tensioner of this embodiment. In the chain system, the rotation of the sprocket 2 attached to the shaft end portion for driving the crankshaft 1 of the engine is transmitted via the chain 3 to the sprocket 5 attached to the shaft end portion of the camshaft 4. The slipper 6 brought into contact with the slack side chain 3 a of the chain 3 is supported so as to be swingable about the shaft 7. The slipper 6 is pressed by the chain tensioner 10 in the direction in which the chain 3 is stretched.

上記チェーンテンショナ１０の詳細構造を図２に示す。図２はチェーンテンショナ１０の主断面図、図３は部分拡大断面図である。チェーンテンショナ１０は、図示しないクランク室の側壁に固定されるハウジング１１を有し、このハウジング１１の一端を開口した圧力室１２内に摺動自在に挿入されたプランジャ１３を備えている。プランジャ１３は、内部に圧力室１２と反対側端を開口した中空室１４が設けられ、その開口端からねじロッド１５が中空室１４の端のねじ係合手段を介して挿入されている。   The detailed structure of the chain tensioner 10 is shown in FIG. 2 is a main sectional view of the chain tensioner 10, and FIG. 3 is a partially enlarged sectional view. The chain tensioner 10 has a housing 11 that is fixed to a side wall of a crank chamber (not shown), and includes a plunger 13 that is slidably inserted into a pressure chamber 12 that is open at one end of the housing 11. The plunger 13 is provided with a hollow chamber 14 having an open end opposite to the pressure chamber 12 therein, and a screw rod 15 is inserted through the screw engagement means at the end of the hollow chamber 14 from the open end.

ねじロッド１５は、その内部にプランジャ１３の中空室１４に向って開口するばね室１５ａが設けられ、ばね室１５ａ内には張力調整ばね１６とピストン１７とが挿入されている。ピストン１７の頭部１７T を中空室１４の内端に当接させてばね張力をプランジャ１３に伝達するようにしている。ねじロッド１５の外周には螺旋状の雄ねじ１５T が形成され、プランジャ１３の開口端内周には雌ねじ１５N が設けられ、ねじ係合手段を形成している。１５ｂはねじロッド１５を貫通する連通路であり、中空室１４を後述する中間室１８と連通している。 The screw rod 15 is provided therein with a spring chamber 15a that opens toward the hollow chamber 14 of the plunger 13, and a tension adjusting spring 16 and a piston 17 are inserted into the spring chamber 15a. The head 17 T of the piston 17 is brought into contact with the inner end of the hollow chamber 14 to transmit the spring tension to the plunger 13. A spiral male screw 15 T is formed on the outer periphery of the screw rod 15, and a female screw 15 N is provided on the inner periphery of the open end of the plunger 13 to form screw engaging means. Reference numeral 15b denotes a communication passage that passes through the screw rod 15, and communicates the hollow chamber 14 with an intermediate chamber 18 described later.

ねじロッド１５の一端には小径部を有し、その小径部の端部にはテーパ面が設けられ、圧力室１２の内端に設けられたロッドシート１９に上記テーパ面を受ける座面が対応して形成されている。ロッドシート１９は、断面視で多段状の凹部が設けられ、中央には、流路１９ａが設けられている。そして、中間の凹部は中間室１８とされ、さらに深い凹部には流路１９ａを開閉するチェックバルブ１９ｂが置かれている。１９ｃは、チェックバルブ１９ｂの移動を制限する制止部材である。   One end of the screw rod 15 has a small-diameter portion, a tapered surface is provided at the end of the small-diameter portion, and a seat surface that receives the tapered surface corresponds to the rod seat 19 provided at the inner end of the pressure chamber 12. Is formed. The rod sheet 19 is provided with a multi-stage recess in a cross-sectional view, and a flow path 19a is provided at the center. The intermediate recess is an intermediate chamber 18, and a check valve 19b for opening and closing the flow path 19a is placed in a deeper recess. 19c is a restraining member that restricts the movement of the check valve 19b.

図示していないが、ハウジング１１はエンジンのクランク室の側壁に固定され、ハウジング１１の他端は端壁１１Ｅで閉じられ、この端壁１１Ｅには濾過手段２０が設けられている。この濾過手段２０は、プランジャ１３が外方向に移動して圧力室１２及び中間室１８の圧力が低下したとき、チェックバルブ１９ｂを開放させ、給油ポンプの駆動により濾過手段２０を経て中間室１８に作動油を供給するようになっている。濾過手段２０は、端壁１１Ｅに設けた連通室２１、これに接続されてハウジング１１の閉塞端側に大径流路２２ａとなって開口する流路２２、その大径流路２２ａに着脱自在に装着されたフィルタ部材２３とから成る。 Although not shown, the housing 11 is fixed to the side wall of the crankcase of the engine, the other end of the housing 11 is closed by an end wall 11 E, filtering means 20 is provided in the end wall 11 E. When the plunger 13 moves outwardly and the pressure in the pressure chamber 12 and the intermediate chamber 18 decreases, the filtering means 20 opens the check valve 19b and drives the oil pump to the intermediate chamber 18 through the filtering means 20. Hydraulic oil is supplied. Filtering means 20, the end wall 11 communicating chamber 21 provided in the E, thereto is connected flow path 22 to become a large diameter channel 22a opened to the closed end side of the housing 11, detachable from the large diameter channel 22a of its consisting instrumentation deposited by filter element 23 to.

フィルタ部材２３は、図３に示すように、大径流路２２ａ内に着脱自在に装着され、周囲に多数の切欠き（窓）２３ａを有する断面視カゴ形の支持フレーム２３の内周に沿ってフィルタ素材２３ｆを取付けたものであって、前記大径流路２２ａに前記開口から断面視カゴ形の底部が奥側となるように装着され、濾過された作動油が多数の切欠き２３ａを通り、通路２２へと流れる。フィルタ素材２３ｆのメッシュの大きさは５０〜４００μｍに設定される。(１)４００μｍ以上の場合は、流入した異物がテンショナの作動性に影響を及ぼし、(２)５０μｍ以下の場合はオイル流出抵抗が大きくなり過ぎ、テンショナへの供給油量及びフィルタの耐久性に影響を及ぼすため、これらの不都合を回避し得るメッシュサイズに限定したのである。その詳細な理由については後で説明する。 As shown in FIG. 3, the filter member 23 is detachably mounted in the large-diameter channel 22a, and extends along the inner circumference of the cage-shaped support frame 23 having a plurality of notches (windows) 23a around it. The filter material 23f is attached to the large-diameter channel 22a so that the bottom of the cage shape in cross section from the opening is the back side, and the filtered hydraulic oil passes through a number of notches 23a . Ru flows into the passage 22. The size of the mesh of the filter material 23f is set to 50 to 400 μm. (1) When the particle size is 400 μm or more, the foreign matter that has flowed in affects the operability of the tensioner. (2) When the particle size is 50 μm or less, the oil outflow resistance becomes too large, and the amount of oil supplied to the tensioner and the durability of the filter Therefore, the mesh size is limited so that these disadvantages can be avoided. The detailed reason will be described later.

図示していないが、図３中の矢印で示す位置には給油ポンプからの配管が接続される。又、図２に示すように、圧力室１２にはその長さ方向の適宜位置にリリーフ弁２４が接続されている。このリリーフ弁２４は、圧力室１２からシリンダ外へのオイル排出油路を形成し、その部位に圧力室１２の内圧が所定の圧力以上になった時に排出油路を開放し、圧力上昇を防止するために設けられている。   Although not shown, piping from the oil supply pump is connected to a position indicated by an arrow in FIG. In addition, as shown in FIG. 2, a relief valve 24 is connected to the pressure chamber 12 at an appropriate position in the length direction. This relief valve 24 forms an oil discharge oil passage from the pressure chamber 12 to the outside of the cylinder, and opens the discharge oil passage when the internal pressure of the pressure chamber 12 becomes equal to or higher than a predetermined pressure to prevent an increase in pressure. Is provided to do.

なお、前述した、ねじ係合手段の雄ねじ１５T と雌ねじ１５N のねじ山は、プランジャ１３の押込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され、上記フランク角とリード角の関係から押込み方向にロック条件、突出方向にゆるみ条件とされている。ゆるみ条件とは張力調整ばね１６の押圧力によってプランジャ１３が外方向にスムースに移動可能となる状態をいう。 The above-described thread of the male thread 15 T and the female thread 15 N of the screw engaging means has a sawtooth shape in which the flank angle of the pressure side flank receiving the pushing force of the plunger 13 is larger than the flank angle of the play side flank. From the relationship between the flank angle and the lead angle, the locking condition is set in the pushing direction and the loosening condition is set in the protruding direction. The loosening condition refers to a state in which the plunger 13 can be smoothly moved outward by the pressing force of the tension adjusting spring 16.

ロック条件とは、プランジャ１３が急激に押込まれても圧力室１２内への移動をせず、チェーン３の振動がプランジャ１３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間分だけ間欠的に当接、離反を繰返し、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ロッド１５が少しずつ間欠的に回転を続けて、押込力と張力調整ばね１６の付勢力とが釣り合う位置までプランジャ１３が圧力室１２内に向けてゆっくりと回転移動する状態をいう。   The lock condition is that the plunger 13 does not move into the pressure chamber 12 even if it is pushed suddenly, and the axial direction formed between the threads of the screw engaging portion when the vibration of the chain 3 acts on the plunger 13. The screw rod 15 continues to rotate little by little intermittently without instantaneously locking the relative screw motion between the two flank surfaces of the contacting screw thread, intermittently contacting and separating by the gap. The state in which the plunger 13 slowly rotates and moves toward the inside of the pressure chamber 12 to a position where the force and the biasing force of the tension adjustment spring 16 are balanced.

上記の構成としたチェーンテンショナを備えたチェーンシステムでは、チェーンテンショナ自体の作動は、従来のチェーンテンショナと同様であり、チェーン３からの押込力がプランジャ１３に作用すると圧力室１２の圧力が高くなり、かつねじ係合手段がロック条件となって急激な押込力に対してはプランジャ１３は瞬間的には移動せず、チェーンテンショナ３からの押込力に対抗する。チェーン３の張力が緩むと、ねじ係合手段はゆるみ条件となり、張力調整ばね１６の張力によりプランジャ１３は突出性を付与されて突出し、チェーンの張力が一定となるように張力が調整される。   In the chain system including the chain tensioner configured as described above, the operation of the chain tensioner itself is the same as that of the conventional chain tensioner. When the pushing force from the chain 3 acts on the plunger 13, the pressure in the pressure chamber 12 increases. In addition, the plunger 13 does not move instantaneously against a sudden pushing force when the screw engaging means is locked, and opposes the pushing force from the chain tensioner 3. When the tension of the chain 3 is loosened, the screw engaging means is loosened, and the tension is adjusted so that the plunger 13 is protruded by the tension of the tension adjusting spring 16 and the chain tension is constant.

このとき、プランジャ１３の突出により中空室１４内の圧力が低下し、このため連通するばね室１５ａ、流路１５ｂ、中空室１８内の圧力も低下し、チェックバルブ１９ｂが開放される。チェックバルブ１９ｂが開放されたときの内圧がエンジンの給油ポンプからの供給油圧より小さいときには、給油ポンプから作動油が供給され、上記各室、流路に不足する分の作動油が送り込まれる。このようにして供給される作動油は途中で濾過手段２０のフィルタ部材２３により異物が取り除かれた状態で供給される。   At this time, the pressure in the hollow chamber 14 is lowered due to the protrusion of the plunger 13, so that the pressure in the spring chamber 15a, the flow path 15b, and the hollow chamber 18 communicating with each other is also lowered, and the check valve 19b is opened. When the internal pressure when the check valve 19b is opened is smaller than the hydraulic pressure supplied from the engine oil pump, the hydraulic oil is supplied from the oil pump, and the insufficient amount of hydraulic oil is sent to the chambers and flow paths. The hydraulic oil supplied in this way is supplied in a state where foreign matters are removed by the filter member 23 of the filtering means 20 on the way.

仮りに上記フィルタ部材２３を設けない場合、エンジンの給油ポンプから循環して供給される作動油には大小様々な粒径の異物が混在して供給され、これら異物はねじ面への異物噛込みによりプランジャ、ねじロッドの作動性が阻害される場合がある。又、上記ねじ係合手段による内部作動部材は油圧ダンパ機構を構成しており、圧力室へのオイル流入を許容し、圧力室から作動油が給油ポンプへ逆流するのを防止するチェックバルブ構造や、圧力室内の圧力室を適正圧力に調整するためのリリーフバルブ構造を採用している。このため、各バルブへの異物噛込みも、テンショナのダンパ能力に影響を及ぼす。   If the filter member 23 is not provided, foreign oils of various sizes are mixedly supplied to the hydraulic oil circulated from the engine oil pump, and these foreign substances are caught in the screw surface. As a result, the operability of the plunger and screw rod may be hindered. Further, the internal operating member by the screw engaging means constitutes a hydraulic damper mechanism, which allows a check valve structure that allows oil to flow into the pressure chamber and prevents the hydraulic oil from flowing back from the pressure chamber to the oil supply pump. A relief valve structure for adjusting the pressure chamber in the pressure chamber to an appropriate pressure is adopted. For this reason, foreign matter biting into each valve also affects the damper capacity of the tensioner.

そこで、チェーンテンショナの組立時にフィルタ部材のフィルタメッシュを種々に変化させ、それぞれの場合の異物付着量により作動油に含まれる異物の大きさ（サイズ）と個数が作動不良に与える影響の度合いを調査した結果、図４に示すような結果が得られた。図示のように、異物の粒径が４００μｍを越えると上述した各構成部材の作動に影響する作動不良の状態が始まり、異物の大きさがさらに大きくなるに従って異物の個数が少なくても影響を及ぼすことが判る。従って、異物の粒径を４００μｍ以下に制限する必要があることが分る。   Therefore, when assembling the chain tensioner, the filter mesh of the filter member is changed in various ways, and the degree of the effect of the size and number of foreign substances contained in the hydraulic oil on the malfunction due to the amount of foreign substances attached in each case is investigated. As a result, a result as shown in FIG. 4 was obtained. As shown in the figure, when the particle size of the foreign material exceeds 400 μm, a malfunctioning state that affects the operation of each of the above-described components starts, and even if the size of the foreign material is further increased, even if the number of foreign materials is small, it is affected. I understand that. Therefore, it can be seen that it is necessary to limit the particle size of the foreign matter to 400 μm or less.

又、異物の粒径を４００μｍ以下に制限した場合、異物の粒径は小さくてもその捕捉個数（量）が所定以上に多くなると、フィルタ部材２３の異物耐力が低下し、その異物耐力が低下する異物粒径及びその個数をこのテンショナの組立時に管理できない領域を、図中の左側にハッチングされた領域で示している。この図から、異物の粒径は小さくてもその個数が所定以上になると、オイル流出抵抗が大きくなり過ぎて供給油量の限度及びフィルタ部材２３の異物耐力限度を越えることとなるが、メッシュサイズが５０μｍ以上であると、ハッチングされていない領域を有して、組立時異物管理によって耐力限度に至らないようにし得ることが理解できる。従って、実際のフィルタ部材２３のメッシュの大きさ（サイズ）の設定は５０〜４００μｍとするのが好ましい。又、このような適正なメッシュサイズのフィルタ部材２３を取付けることによりテンショナの作動性に影響を与えることなく、異物による作動不良を防止することができることとなる。 In addition, when the particle size of the foreign material is limited to 400 μm or less, even if the particle size of the foreign material is small, if the number of captured particles (amount) exceeds a predetermined value, the foreign material resistance of the filter member 23 decreases , and the foreign material resistance decreases. A region in which the particle size and the number of foreign particles to be managed cannot be managed when the tensioner is assembled is indicated by a hatched region on the left side in the drawing. From this figure, when the number thereof also the particle size of foreign matter is small it is equal to or greater than a predetermined, but so that the excess of foreign body strength limits OIL outflow limits of resistance becomes too large oil supply amount and the filter member 23, the mesh It can be understood that when the size is 50 μm or more, there is an unhatched region, and it is possible to prevent reaching the proof stress limit by foreign matter management during assembly. Therefore, it is preferable to set the mesh size (size) of the actual filter member 23 to 50 to 400 μm. Further, by attaching the filter member 23 having such an appropriate mesh size, it is possible to prevent malfunction due to foreign matters without affecting the operability of the tensioner.

この発明のチェーンテンショナは、チェーンテンショナにフィルタ部を設けてその作動性、流動抵抗に影響を及ぼさないようにしたから、エンジンから供給される作動油で作動する形式の全てのチェーンテンショナに広く利用することができる。   Since the chain tensioner of the present invention is provided with a filter portion on the chain tensioner so as not to affect its operability and flow resistance, it is widely used for all types of chain tensioners that operate with hydraulic oil supplied from the engine. can do.

実施形態のチェーンテンショナシステムの全体概略構成図Overall schematic configuration diagram of the chain tensioner system of the embodiment 実施形態のチェーンテンショナの主断面図Main sectional view of the chain tensioner of the embodiment 実施形態のチェーンテンショナの要部拡大断面図The principal part expanded sectional view of the chain tensioner of an embodiment 実施形態のチェーンテンショナフィルタメッシュサイズと異物耐力と組立時異物付着量の関係測定データのグラフGraph of relationship measurement data of chain tensioner filter mesh size, foreign material proof strength and foreign matter adhesion amount during assembly of embodiment

符号の説明Explanation of symbols

１ クランクシャフト
２、５ スプロケット
３ チェーン
４ カムシャフト
６ スリッパ
７ 軸
１０ チェーンテンショナ
１１ ハウジング
１２ 圧力室
１３ プランジャ
１４ 中空室
１５ ねじロッド
１５N 雌ねじ
１５T 雄ねじ
１５ａ ばね室
１５ｂ 連通路
１６ 張力調整ばね
１７ ピストン
１８ 中間室
１９ ロッドシート
２０ 濾過手段
２１ 連通室
２２ 流路
２２ａ 大径流路
２３ フィルタ部材
２３ｆ フィルタ素材
２４ リリーフ弁 1 Crankshaft 2, 5 Sprocket 3 Chain 4 Camshaft 6 Slipper 7 Shaft 10 Chain Tensioner 11 Housing 12 Pressure Chamber 13 Plunger 14 Hollow Chamber 15 Screw Rod 15 N Female Thread 15 T Male Thread 15a Spring Chamber 15b Communication Path 16 Tension Adjustment Spring 17 Piston 18 Intermediate chamber 19 Rod seat 20 Filtration means 21 Communication chamber 22 Flow path 22a Large diameter flow path 23 Filter member 23f Filter material 24 Relief valve

Claims (1)

ハウジング（１１）の一端面で開口する圧力室（１２）にチェーン押圧用のプランジャ（１３）をスライド自在に挿入し、プランジャ（１３）に外方向への突出性を付与する張力調整ばね（１６）と、チェーン（３）からプランジャ（１３）を介して負荷される荷重を受け、プランジャ（１３）の後退動を鋸歯ねじ（１５Ｎ、１５Ｔ）を用いたねじ係合手段により阻止して衝撃を緩衝するダンパ機構とを備え、
上記ハウジング（１１）の閉塞端側に上記圧力室（１２）に連通して設けられる給油通路（２２）にフィルタ部材（２３）を設け、前記圧力室（１２）とフィルタ部材（２３）との間に、テンショナ内部の圧力が、エンジンからの供給圧より小さい時は作動油の流入を許容し、テンショナ内圧がエンジンからの供給圧より大きいときは、作動油の逆流を防止するチェックバルブ（１９ｂ）を設け、かつ、前記圧力室（１２）からシリンダ外へ通じる作動油の排出路に、圧力室（１２）の内圧がある一定圧力以上になると排出路を開放して圧力上昇を所定範囲に防止するリリーフ弁（２４）を設けた、エンジンのカムを駆動するチェーンシステムの張力を一定に保持するチェーンテンショナの異物流入構造において、
前記給油通路（２２）は前記ハウジング（１１）の閉塞端側に大径流路（２２ａ）となって開口してこの開口に給油ポンプからの配管が接続され、前記フィルタ部材（２３）は、周囲に多数の切欠き（２３ａ）を有する断面視カゴ形の支持フレーム（２３）の内周に沿ってフィルタ素材（２３ｆ）を取付けたものであって、前記大径流路（２２ａ）に前記開口から断面視カゴ形の底部が奥側となるように着脱自在に装着され、前記フィルタ素材（２３ｆ）で濾過された作動油が前記切欠き（２３ａ）を通って通路２２へと流れるようになっていることを特徴とするチェーンテンショナの異物流入構造。 A chain pressing plunger (13) is slidably inserted into a pressure chamber (12) opened at one end surface of the housing (11), and a tension adjusting spring (16) for imparting outward protrusion to the plunger (13). ) And a load applied from the chain (3) via the plunger (13), and the backward movement of the plunger (13) is prevented by a screw engaging means using sawtooth screws (15 N , 15 T ). With a damper mechanism to cushion the impact,
Upper Symbol housing (11) the pressure chamber at the closed end of the (12) the filter member (23) to the oil supply passage provided in communication (22) in provided, the pressure chamber (12) and the filter member (23) During this time, when the pressure inside the tensioner is smaller than the supply pressure from the engine, inflow of hydraulic oil is allowed. When the internal pressure of the tensioner is higher than the supply pressure from the engine, a check valve that prevents backflow of hydraulic oil ( 19b), and when the internal pressure of the pressure chamber (12) exceeds a certain pressure in the hydraulic oil discharge path leading from the pressure chamber (12) to the outside of the cylinder, the discharge path is opened to increase the pressure within a predetermined range. In the foreign body inflow structure of the chain tensioner, which is provided with a relief valve (24) for preventing the chain tension and keeps the tension of the chain system for driving the cam of the engine constant ,
The oil supply passage (22) is opened as a large-diameter flow path (22a) on the closed end side of the housing (11), and a pipe from the oil supply pump is connected to the opening, and the filter member (23) A filter material (23f) is attached along the inner periphery of a cage-shaped support frame (23) having a number of notches (23a) in the cross-sectional view, and the large-diameter channel (22a) extends from the opening. The bottom part of the cage shape in cross section is detachably mounted so that the bottom side becomes the back side, and the hydraulic oil filtered by the filter material (23f) flows into the passage 22 through the notch (23a). Foreign material inflow structure of the chain tensioner characterized by
JP2005000113A 2004-11-29 2005-01-04 Structure to prevent foreign matter from entering the chain tensioner Active JP4754220B2 (en)

Priority Applications (3)

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JP2005000113A JP4754220B2 (en) 2005-01-04 2005-01-04 Structure to prevent foreign matter from entering the chain tensioner
EP05025259.2A EP1662175B1 (en) 2004-11-29 2005-11-18 Chain tensioner
US11/283,751 US20060116229A1 (en) 2004-11-29 2005-11-22 Chain tensioner

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EP2910818B1 (en) 2012-10-16 2017-09-20 NTN Corporation Hydraulic automatic tensioner for auxiliary device
JP2014109352A (en) * 2012-12-04 2014-06-12 Ntn Corp Hydraulic auto tensioner for auxiliary machine
JP2014101955A (en) * 2012-11-21 2014-06-05 Ntn Corp Hydraulic auto tensioner for auxiliary machinery
KR101417427B1 (en) * 2012-11-23 2014-07-08 기아자동차주식회사 Tensioner for timing chain
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