JP2005036913A - Auto tensioner - Google Patents

Auto tensioner Download PDF

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JP2005036913A
JP2005036913A JP2003275339A JP2003275339A JP2005036913A JP 2005036913 A JP2005036913 A JP 2005036913A JP 2003275339 A JP2003275339 A JP 2003275339A JP 2003275339 A JP2003275339 A JP 2003275339A JP 2005036913 A JP2005036913 A JP 2005036913A
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rotating member
shaft portion
fixing member
fitting hole
belt
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JP2003275339A
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Japanese (ja)
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Koji Fukuda
耕治 福田
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Bando Chemical Industries Ltd
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Bando Chemical Industries Ltd
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Priority to JP2003275339A priority Critical patent/JP2005036913A/en
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Abstract

<P>PROBLEM TO BE SOLVED: To provide an auto tensioner with at least a damping means between a shaft portion 1b of a fixed member 1 and a fitting hole 2d of a turning member 2, minimizing the tilting of the turning member 2 from a regular condition by improving fitting accuracy between the shaft portion 1b of the fixed member 1 and the fitting hole 2d of the turning member 2. <P>SOLUTION: The damping means provided between the shaft portion 1b of the fixed member 1 and the fitting hole 2d of the turning member 2 is formed with a resin coating material 1e coating the shaft portion of the fixed member at its outer peripheral face. Otherwise, it is formed with a resin coating material coating the fitting hole 2d of the turning member 2 at its inner peripheral face. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

本発明は、複数のプーリ間に巻き掛けられたベルトの張力を自動的に調整するためのオートテンショナに関する技術分野に属する。   The present invention belongs to a technical field related to an auto tensioner for automatically adjusting a tension of a belt wound between a plurality of pulleys.

従来より、この種のオートテンショナとして、軸部を有しかつアルミ合金等の金属からなる固定部材と、この固定部材の軸部と嵌合する嵌合孔が形成されたボス部を有し、該嵌合により固定部材の軸部に回動可能に支持された金属製の回動部材と、この回動部材に、該回動部材の回動軸心と平行な軸心回りに回転自在となるように支持され、ベルトが巻き掛けられるテンションプーリと、上記回動部材のボス部周囲に配置された状態で上記固定部材と回動部材との間に連結され、該回動部材を固定部材に対し上記テンションプーリが上記ベルトを押圧する方向に回動付勢する捩りコイルばねと、上記回動部材の回動を減衰させる減衰手段とを備えたものが知られている（例えば、特許文献１参照）。   Conventionally, as this type of autotensioner, it has a fixed member made of a metal such as an aluminum alloy with a shaft portion, and a boss portion formed with a fitting hole to be fitted to the shaft portion of the fixed member, A metal rotating member that is rotatably supported by the shaft portion of the fixed member by the fitting, and the rotating member is rotatable about an axis parallel to the rotating axis of the rotating member. A tension pulley that is supported so that the belt is wound thereon, and is connected between the fixing member and the rotating member in a state of being arranged around the boss portion of the rotating member, and the rotating member is fixed to the fixing member A tension coil spring that urges the belt in a direction in which the tension pulley presses the belt and a damping means that attenuates the rotation of the rotating member are known (for example, Patent Documents). 1).

そして、上記オートテンショナでは、固定部材の軸部と回動部材の嵌合孔との間に樹脂製インサートベアリングが、また回動部材のボス部と捩りコイルばねとの間に樹脂製スプリングサポートが、さらに回動部材背面側に突出した軸部先端と回動部材背面との間に樹脂製スラストワッシャがそれぞれ配置され、これらインサートベアリング、スプリングサポート及びスラストワッシャは、上記減衰手段を構成しており、これら樹脂と金属との摩擦抵抗により回動部材の回動を減衰させるようにしている。
特開平７−８３２９６号公報 In the auto tensioner, a resin insert bearing is provided between the shaft portion of the fixed member and the fitting hole of the rotating member, and a resin spring support is provided between the boss portion of the rotating member and the torsion coil spring. Further, a plastic thrust washer is disposed between the tip of the shaft portion protruding to the back side of the rotating member and the back surface of the rotating member, and these insert bearing, spring support and thrust washer constitute the damping means. The rotation of the rotating member is attenuated by the frictional resistance between the resin and the metal.
JP-A-7-83296

ところで、上記固定部材の軸部と回動部材の嵌合孔との間に設けられたインサートベアリングは、固定部材の軸部に対して回動しないように回り止め手段を有している。この回り止め手段は、インサートベアリングの内周面から固定部材の軸部側に突出する突出部で構成され、この突出部が固定部材の軸部に設けた凹部に嵌められてインサートベアリングの回り止めがなされる。   By the way, the insert bearing provided between the shaft portion of the fixed member and the fitting hole of the rotating member has a detent means so as not to rotate with respect to the shaft portion of the fixed member. This anti-rotation means is composed of a protrusion that protrudes from the inner peripheral surface of the insert bearing toward the shaft portion of the fixed member, and this protrusion is fitted into a recess provided in the shaft portion of the fixed member to prevent rotation of the insert bearing. Is made.

しかし、上記のようにインサートベアリングの内周面に突出部を形成するようにすると、インサートベアリングの成形時に、インサートベアリングの外周面における上記突出部に対応する部分にヒケが生じ、このヒケにより、インサートベアリングの外周面と回動部材の嵌合孔との間に比較的大きな隙間が生じて、回動部材が正規の状態から傾いてしまうという問題がある。   However, if the protrusion is formed on the inner peripheral surface of the insert bearing as described above, sink marks are generated in the portion corresponding to the protrusions on the outer peripheral surface of the insert bearing when molding the insert bearing. There is a problem that a relatively large gap is generated between the outer peripheral surface of the insert bearing and the fitting hole of the rotating member, and the rotating member is inclined from the normal state.

また、たとえヒケが生じないようにインサートベアリングを成形できたとしても、固定部材の軸部と回動部材の嵌合孔との嵌合が、インサートベアリングを介して行われるので、嵌合精度を高くすることは困難であり、寸法のばらつき等により回動部材の傾きが生じる場合がある。   Moreover, even if the insert bearing can be molded so as not to cause sink marks, the fitting between the shaft portion of the fixed member and the fitting hole of the rotating member is performed via the insert bearing, so that the fitting accuracy can be improved. It is difficult to increase the height, and the tilt of the rotating member may occur due to dimensional variation or the like.

本発明は斯かる点に鑑みてなされたものであり、その目的とするところは、少なくとも固定部材の軸部と回動部材の嵌合孔との間に減衰手段が設けられたオートテンショナに対し、その減衰手段に工夫を凝らすことによって、固定部材の軸部と回動部材の嵌合孔との嵌合精度を向上させて、回動部材が正規の状態から傾くのを出来る限り抑えようとすることにある。   The present invention has been made in view of such points, and an object of the present invention is to provide an auto tensioner in which a damping means is provided at least between the shaft portion of the fixed member and the fitting hole of the rotating member. By devising the damping means, the fitting accuracy between the shaft portion of the fixed member and the fitting hole of the turning member is improved, and the turning member is prevented from tilting from the normal state as much as possible. There is to do.

上記の目的を達成するために、この発明では、固定部材の軸部と回動部材の嵌合孔との間に設けられた減衰手段を、該固定部材の軸部の外周面又は回動部材の嵌合孔の内周面にコーティングされた樹脂コーティング材で構成するようにした。   In order to achieve the above object, according to the present invention, the damping means provided between the shaft portion of the fixing member and the fitting hole of the rotating member is used as the outer peripheral surface of the shaft portion of the fixing member or the rotating member. The resin coating material is coated on the inner peripheral surface of the fitting hole.

具体的には、請求項１の発明では、軸部を有する固定部材と、上記固定部材の軸部と嵌合する嵌合孔を有し、該嵌合により該固定部材の軸部に回動可能に支持された回動部材と、上記回動部材に、該回動部材の回動軸心と平行な軸心回りに回転自在となるように支持され、ベルトが巻き掛けられるテンションプーリと、上記固定部材と回動部材との間に連結され、該回動部材を固定部材に対し上記テンションプーリが上記ベルトを押圧する方向に回動付勢する付勢手段と、少なくとも上記固定部材の軸部と回動部材の嵌合孔との間に設けられ、該回動部材の回動を減衰させる減衰手段とを備え、上記ベルトの張力を自動的に調整するようにしたオートテンショナを対象とする。   Specifically, in the first aspect of the present invention, the fixing member having the shaft portion and the fitting hole that fits with the shaft portion of the fixing member are provided, and the fitting rotates the shaft portion of the fixing member. A pivot member supported in a possible manner, a tension pulley supported by the pivot member so as to be rotatable about an axis parallel to the pivot axis of the pivot member, and around which a belt is wound, An urging means connected between the fixing member and the rotating member, and urging the rotating member in a direction in which the tension pulley presses the belt against the fixing member; and at least a shaft of the fixing member An auto tensioner provided between the fitting portion and the fitting hole of the rotating member and provided with an attenuating means for attenuating the rotation of the rotating member and automatically adjusting the tension of the belt. To do.

そして、上記固定部材の軸部と回動部材の嵌合孔との間に設けられた減衰手段は、該固定部材の軸部の外周面又は回動部材の嵌合孔の内周面にコーティングされた樹脂コーティング材で構成されているものとする。   The damping means provided between the shaft portion of the fixing member and the fitting hole of the rotating member is coated on the outer peripheral surface of the shaft portion of the fixing member or the inner peripheral surface of the fitting hole of the rotating member. It shall be comprised with the resin coating material made.

上記の構成により、樹脂コーティング材は、通常、固定部材の軸部の外周面又は回動部材の嵌合孔の内周面にかなり薄い膜厚で略均一にコーティングすることができるので、固定部材の軸部と回動部材の嵌合孔とを直接嵌合させるのと略同じ嵌合精度が得られる。この結果、回動部材が正規の状態から傾くのを防止することができる。また、固定部材の軸部の外周面又は回動部材の嵌合孔の内周面に樹脂コーティング材をコーティングすることで、減衰手段が、従来のインサートベアリングのように固定部材又は回動部材とは別部品とならずに済み、固定部材又は回動部材と一体のものとすることができ、この結果、部品点数を減らして、組立工数を低減することができる。   With the above configuration, the resin coating material can normally be coated substantially uniformly with a considerably thin film thickness on the outer peripheral surface of the shaft portion of the fixing member or the inner peripheral surface of the fitting hole of the rotating member. The same fitting accuracy as that obtained by directly fitting the shaft portion and the fitting hole of the rotating member can be obtained. As a result, the rotating member can be prevented from being tilted from the normal state. Further, by coating a resin coating material on the outer peripheral surface of the shaft portion of the fixed member or the inner peripheral surface of the fitting hole of the rotating member, the damping means can be connected to the fixed member or the rotating member like a conventional insert bearing. Is not required to be a separate part, and can be integrated with a fixed member or a rotating member. As a result, the number of parts can be reduced and the number of assembly steps can be reduced.

請求項２の発明では、請求項１の発明において、樹脂コーティング材は、ポリエーテルエーテルケトンからなるものとする。   In the invention of claim 2, in the invention of claim 1, the resin coating material is made of polyetheretherketone.

このことにより、ポリエーテルエーテルケトンは耐摩耗性及び耐熱性に優れているので、樹脂コーティング材の膜厚が薄くても、高寿命を維持することができる。また、樹脂コーティング材に固体潤滑剤やアラミド繊維を適宜に配合することで、寿命を更に向上させることができる。   Thereby, since polyether ether ketone is excellent in abrasion resistance and heat resistance, a long life can be maintained even if the film thickness of the resin coating material is thin. Moreover, a lifetime can further be improved by mix | blending a solid lubricant and an aramid fiber suitably with a resin coating material.

本発明のオートテンショナによると、固定部材の軸部と回動部材の嵌合孔との間に設けられた減衰手段を、該固定部材の軸部の外周面又は回動部材の嵌合孔の内周面にコーティングされた樹脂コーティング材で構成したことにより、固定部材の軸部と回動部材の嵌合孔との嵌合精度を向上させることができ、回動部材が正規の状態から傾くのを出来る限り抑制することができるとともに、組立工数を低減することができる。   According to the auto tensioner of the present invention, the damping means provided between the shaft portion of the fixing member and the fitting hole of the rotating member is connected to the outer peripheral surface of the shaft portion of the fixing member or the fitting hole of the rotating member. By comprising the resin coating material coated on the inner peripheral surface, the fitting accuracy between the shaft portion of the fixed member and the fitting hole of the rotating member can be improved, and the rotating member is inclined from the normal state. Can be suppressed as much as possible, and the number of assembling steps can be reduced.

また、樹脂コーティング材を、ポリエーテルエーテルケトンからなるものとすることにより、高寿命を維持することができる。   Moreover, long life can be maintained by using a resin coating material made of polyetheretherketone.

以下、本発明の実施形態を図面に基づいて詳細に説明する。   Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

図１及び図２は、本発明の実施形態に係るオートテンショナを示し、このオートテンショナは、例えば自動車のエンジンの出力軸により複数のエンジン補機を１本のベルトを介して駆動する補機駆動システムにおいて、該ベルトの張力を自動的に調整するために用いられる。   1 and 2 show an auto tensioner according to an embodiment of the present invention. This auto tensioner is, for example, an auxiliary machine drive that drives a plurality of engine auxiliary machines via a single belt by an output shaft of an engine of an automobile, for example. Used in the system to automatically adjust the belt tension.

上記オートテンショナは、上記エンジン等の固定体に固定される固定部材１と、この固定部材１に回動可能に支持された回動部材２と、この回動部材２に軸支され、上記エンジン補機を駆動するベルト等のように複数のプーリ間に巻き掛けられたベルト２０（図２の二点鎖線参照）が巻き掛けられるテンションプーリ８と、上記固定部材１と回動部材２との間に連結され、回動部材２を固定部材１に対しテンションプーリ８がベルト２０を押圧する方向（図２で時計回り方向）に回動付勢する付勢手段としての捩りコイルばね３とを備えている。   The auto tensioner includes a fixing member 1 fixed to a fixing body such as the engine, a rotating member 2 rotatably supported by the fixing member 1, and a pivot member supported by the rotating member 2, and the engine. A tension pulley 8 around which a belt 20 (see a two-dot chain line in FIG. 2) wound around a plurality of pulleys such as a belt for driving an auxiliary machine is wound, and the fixing member 1 and the rotating member 2 A torsion coil spring 3 as an urging means coupled between the urging member 2 and urging the rotation member 2 in a direction in which the tension pulley 8 presses the belt 20 against the fixing member 1 (clockwise direction in FIG. 2). I have.

上記固定部材１は、例えばアルミニウム合金等からなる金属製のものであって、一端（図１で上端）が開口する有底円筒状（カップ状）の固定部材本体１ａと、この固定部材本体１ａの底部に、該固定部材本体１ａの開口から突出するように同心状に立設された先細りテーパ状の軸部１ｂとを有し、この固定部材本体１ａが固定体に取付固定される。上記固定部材本体１ａの側壁には、該側壁を径方向に貫通するばね係止部１ｃが形成されている（このばね係止部１ｃは、後述の回動部材２のばね係止部２ｂと同様に、固定部材本体１ａの側壁に形成した切欠きで構成してもよい）。尚、上記軸部１ｂの中心部には、該軸部１ｂ及び固定部材本体１ａの底壁を連続して貫通する貫通孔１ｄが開けられている。   The fixing member 1 is made of, for example, a metal made of an aluminum alloy or the like, and has a bottomed cylindrical (cup shape) fixing member main body 1a having one end (upper end in FIG. 1) opened, and the fixing member main body 1a. And a tapered tapered shaft portion 1b that is concentrically provided so as to protrude from the opening of the fixing member main body 1a, and the fixing member main body 1a is attached and fixed to the fixing body. On the side wall of the fixing member main body 1a, a spring locking portion 1c penetrating the side wall in the radial direction is formed (this spring locking portion 1c includes a spring locking portion 2b of the rotating member 2 described later). Similarly, you may comprise by the notch formed in the side wall of the fixing member main body 1a). A through hole 1d is formed in the central portion of the shaft portion 1b so as to continuously pass through the shaft portion 1b and the bottom wall of the fixing member main body 1a.

一方、上記回動部材２は、上記固定部材１と同様に、例えばアルミニウム合金等からなる金属製のもので、一端（図１で下端）が開口する有底円筒状（カップ状）の回動部材本体２ａを備え、この回動部材本体２ａの外径は上記固定部材本体１ａと略同径とされている。この回動部材本体２ａの側壁には、その開口側から切り欠いた切欠きからなるばね係止部２ｂが形成されている（このばね係止部２ｂは、上記固定部材１のばね係止部１ｃと同様に、回動部材本体２ａの側壁に貫通形成した貫通孔で構成してもよい）。   On the other hand, the rotating member 2 is made of a metal made of, for example, an aluminum alloy, like the fixing member 1, and has a bottomed cylindrical shape (cup shape) whose one end (lower end in FIG. 1) is open. A member body 2a is provided, and the outer diameter of the rotating member body 2a is substantially the same as that of the fixed member body 1a. On the side wall of the rotating member main body 2a, a spring locking portion 2b made of a notch cut out from the opening side is formed (this spring locking portion 2b is a spring locking portion of the fixing member 1). Similarly to 1c, it may be constituted by a through hole formed through the side wall of the rotating member main body 2a).

上記回動部材本体２ａの底部には円筒状の第１ボス部２ｃが該回動部材本体２ａの開口から突出するように同心状に一体に突設され、この第１ボス部２ａの中心部には、上記固定部材１の軸部１ｂと嵌合する嵌合孔２ｄが形成されている。この嵌合孔２ｄは、第１ボス部２ｃ先端側に向かって内径が増大するようにテーパ状に形成されており、この嵌合孔２ｄのテーパ角度は上記固定部材１の軸部１ｂのテーパ角度と略同じとされている。また、この嵌合孔２ｄは、第１ボス部２ｃ及び回動部材本体２ａの底壁を連続して貫通している。そして、上記第１ボス部２ｃが固定部材１の軸部１ｂに第１ボス部２ｃ先端側から外嵌合され（つまり固定部材１の軸部１ｂと回動部材２の嵌合孔２ｄとが嵌合され）、この嵌合により回動部材２が固定部材１の軸部１ｂに回動可能に支持されることになる。このとき、固定部材本体１ａと回動部材本体２ａとは、各々の開口同士が対向するように合わされる。   A cylindrical first boss portion 2c is integrally and projectingly provided at the bottom of the rotating member body 2a so as to protrude from the opening of the rotating member body 2a, and the central portion of the first boss portion 2a. Is formed with a fitting hole 2d for fitting with the shaft portion 1b of the fixing member 1. The fitting hole 2d is tapered so that the inner diameter increases toward the tip end side of the first boss 2c. The taper angle of the fitting hole 2d is the taper of the shaft 1b of the fixing member 1. It is almost the same as the angle. In addition, the fitting hole 2d passes through the first boss portion 2c and the bottom wall of the rotating member body 2a continuously. Then, the first boss portion 2c is externally fitted to the shaft portion 1b of the fixing member 1 from the front end side of the first boss portion 2c (that is, the shaft portion 1b of the fixing member 1 and the fitting hole 2d of the rotating member 2 are fitted. By this fitting, the rotating member 2 is rotatably supported by the shaft portion 1b of the fixed member 1. At this time, the fixing member main body 1a and the rotating member main body 2a are combined so that the respective openings face each other.

上記回動部材本体２ａの側壁における外周面の底壁側には、径方向外側に（図１で水平方向に）延びるアーム部２ｅが突設され、このアーム部２ｅの先端部には、上記第１ボス部２ｃと平行に回動部材２の背面側（図１で上側）に延びる第２ボス部２ｆが形成されている。この第２ボス部２ｆの先端部にベアリング１０を介して上記テンションプーリ８が回転自在に支持されている。つまり、テンションプーリ８は、回動部材２に、該回動部材２の回動軸心と平行な軸心回りに回転自在となるように支持されている。尚、上記ベアリング１０は、第２ボス部２ｆの中心部に螺合締結されるボルト９により、ダストカバー１１を介して第２ボス部２ｆの先端部に固定される。   On the bottom wall side of the outer peripheral surface of the side wall of the rotating member main body 2a, an arm portion 2e extending outward in the radial direction (horizontal direction in FIG. 1) protrudes, and the tip of the arm portion 2e A second boss portion 2 f is formed in parallel with the first boss portion 2 c and extending to the back side (upper side in FIG. 1) of the rotating member 2. The tension pulley 8 is rotatably supported via a bearing 10 at the tip of the second boss 2f. That is, the tension pulley 8 is supported by the rotating member 2 so as to be rotatable about an axis parallel to the rotating axis of the rotating member 2. The bearing 10 is fixed to the distal end portion of the second boss portion 2f via the dust cover 11 by a bolt 9 screwed and fastened to the center portion of the second boss portion 2f.

上記捩りコイルばね３は、上記回動部材２の第１ボス部２ｃ周囲に両端部３ａ，３ｂ（タング）を径方向外側に突出させた状態で配置されている。この一方の端部３ａは上記固定部材本体１ａのばね係止部１ｃに、また他方の端部３ｂは回動部材本体２ａのばね係止部２ｂにそれぞれ係止されており、回動部材２を固定部材１に対しテンションプーリ８がベルト２０を押圧する方向に回動付勢するようになっている。また、この捩りコイルばね３は、固定部材本体１ａの内底面と回動部材本体２ａの内底面との間に軸方向に圧縮された状態で介装されており、該捩りコイルばね３の軸心方向の押圧力により、後述のスプリングサポート４のフランジ部４ｂを固定部材本体１ａの内底面に押付固定するとともに、回動部材本体２ａの背面を後述のスラストワッシャ１４に押し付けるようになっている。   The torsion coil spring 3 is disposed around the first boss portion 2c of the rotating member 2 with both end portions 3a and 3b (tangs) protruding radially outward. One end 3a is locked to the spring locking portion 1c of the fixing member main body 1a, and the other end 3b is locked to the spring locking portion 2b of the rotating member main body 2a. The tension pulley 8 is urged to rotate in the direction in which the belt 20 is pressed against the fixing member 1. The torsion coil spring 3 is interposed between the inner bottom surface of the fixed member main body 1a and the inner bottom surface of the rotating member main body 2a in an axially compressed state. A flange portion 4b of a spring support 4 described later is pressed and fixed to the inner bottom surface of the fixing member main body 1a by a pressing force in the center direction, and the back surface of the rotating member main body 2a is pressed against a thrust washer 14 described later. .

本実施形態では、上記オートテンショナは、上記回動部材２の回動を減衰させる３つの減衰手段を備えている。まず、上記固定部材１の軸部１ｂと回動部材２の嵌合孔２ｄとの間に、１つ目の減衰手段が設けられている。この減衰手段は、上記固定部材１の軸部１ｂの外周面にコーティングされた樹脂コーティング材１ｅで構成されている。この樹脂コーティング材１ｅの膜厚は、１００μｍ以上５００μｍ以下であることが好ましい。そして、このような薄さでも高寿命を維持するために、樹脂コーティング材１ｅは、耐摩耗性及び耐熱性に優れたポリエーテルエーテルケトン（ＰＥＥＫ樹脂）からなることが好ましく、ポリエーテルエーテルケトンに固体潤滑剤やアラミド繊維を配合すれば、寿命が向上してより好ましい。このポリエーテルエーテルケトンでは、４００℃で連続使用しても問題がない（従来のインサートベアリングで使用されているポリアミド４６では、連続使用で耐え得る温度は１４０℃である）。尚、ＰＥＥＫ樹脂のコーティング方法は、例えば特開２０００−２７２０４９号公報に記載されている。   In the present embodiment, the auto tensioner includes three attenuation means that attenuate the rotation of the rotation member 2. First, a first damping means is provided between the shaft portion 1 b of the fixing member 1 and the fitting hole 2 d of the rotating member 2. This attenuating means is composed of a resin coating material 1e coated on the outer peripheral surface of the shaft portion 1b of the fixing member 1. The thickness of the resin coating material 1e is preferably 100 μm or more and 500 μm or less. In order to maintain a long life even in such a thin state, the resin coating material 1e is preferably made of polyether ether ketone (PEEK resin) excellent in wear resistance and heat resistance. If a solid lubricant or an aramid fiber is blended, the life is improved and it is more preferable. With this polyetheretherketone, there is no problem even if it is continuously used at 400 ° C. (In the polyamide 46 used in the conventional insert bearing, the temperature that can be endured by continuous use is 140 ° C.). The PEEK resin coating method is described, for example, in JP-A No. 2000-272049.

また、上記回動部材２の第１ボス部２ｃと捩りコイルばね３との間には、２つ目の減衰手段としての樹脂製のスプリングサポート４が配置されている。このスプリングサポート４は、捩りコイルばね３の捩りトルクの反力により径方向内側に押圧されて第１ボス部２ｃ外周面に押し付けられる略円筒状の摺接部４ａと、この摺接部４ａにおいて第１ボス部２ｃ先端側の端部から径方向外側に突出し、捩りコイルばね３の軸心方向の押圧力により軸方向に押圧されて固定部材本体１ａの内底面に押付固定されるフランジ部４ｂとを有する。そして、捩りコイルばね３により、スプリングサポート４の摺接部４ａが押圧されて回動部材２の第１ボス部２ｃに、また第１ボス部２ｃも押圧されて上記樹脂コーティング材１ｅにそれぞれ押し付けられることで、回動部材２の回動を減衰させるようにしている。   Further, a resin spring support 4 as a second damping means is disposed between the first boss portion 2 c of the rotating member 2 and the torsion coil spring 3. The spring support 4 includes a substantially cylindrical sliding contact portion 4a that is pressed radially inward by a reaction force of torsional torque of the torsion coil spring 3 and pressed against the outer peripheral surface of the first boss portion 2c, and the sliding contact portion 4a. A flange portion 4b that protrudes radially outward from the end portion on the distal end side of the first boss portion 2c and is pressed and fixed to the inner bottom surface of the fixing member main body 1a by being pressed in the axial direction by the axial force of the torsion coil spring 3 And have. Then, the sliding contact portion 4a of the spring support 4 is pressed by the torsion coil spring 3 and pressed against the first boss portion 2c of the rotating member 2, and the first boss portion 2c is also pressed against the resin coating material 1e. As a result, the rotation of the rotation member 2 is attenuated.

さらに、上記固定部材１の軸部１ｂの先端部は、回動部材２の嵌合孔２ｄを貫通して回動部材２の背面側に突出する突出部１ｆを有し、この突出部１ｆには、回動部材２の抜止めのための金属からなる円板状のプレート部材１５が回転不能に固定止着されている。このプレート部材１５と回動部材本体２ａの背面との間には３つ目の減衰手段としての樹脂製のスラストワッシャ１４が介装されており、上記捩りコイルばね３の軸心方向の押圧力により、このスラストワッシャ１４に回動部材本体２ａの背面が押し付けられ、この状態でスラストワッシャ１４と回動部材本体２ａの背面とが摺接することで、回動部材２の回動を減衰させる。   Further, the distal end portion of the shaft portion 1b of the fixing member 1 has a protruding portion 1f that passes through the fitting hole 2d of the rotating member 2 and protrudes to the back side of the rotating member 2, and the protruding portion 1f includes a protruding portion 1f. The disk-shaped plate member 15 made of metal for preventing the rotation member 2 from being fixed is fixed and fixed so as not to rotate. A resin-made thrust washer 14 is interposed between the plate member 15 and the back surface of the rotating member main body 2a, and the pressing force in the axial direction of the torsion coil spring 3 is interposed therebetween. Thus, the back surface of the rotating member main body 2a is pressed against the thrust washer 14, and the thrust washer 14 and the back surface of the rotating member main body 2a are slidably contacted with each other in this state to attenuate the rotation of the rotating member 2.

上記オートテンショナの固定部材１を固定体に固定し、テンションプーリ８にベルト２０を巻き掛けると、捩りコイルばね３の捩りトルクにより回動部材２が固定部材１に対して回動付勢され、この回動付勢によりテンションプーリ８がベルト２０を押圧して、ベルト２０に張力が付与される。そして、このベルト２０の張力が低下すると、捩りコイルばね３の捩りトルク（回動付勢力）により、テンションプーリがベルト２０を押圧するように回動部材がベルト２０を押圧する方向（図２で時計回り方向）に回動する一方、ベルト２０の張力が増大すると、テンションプーリ２０がベルト２０により押されて回動部材２が捩りコイルばね３の捩りトルクに抗してベルト２０を押圧する方向とは反対方向（図２で反時計回り方向）に回動する。上記回動部材２の回動は、上記３つの減衰手段、つまり、樹脂コーティング材１ｅ、スプリングサポート８及びスラストワッシャ１４により減衰される。この減衰力は、ベルト２０の張力が低下したときには、捩りコイルばね３の捩りトルクの反力の減少により小さくなる一方、ベルト２０の張力が増大したときには、捩りコイルばね３の捩りトルクの反力の増大により大きくなる。これにより、ベルト２０の張力が低下したときには、回動部材２が回動し易くなってテンションプーリ８のベルト２０に対する追従性が高くなり、このことで、ベルト２０の張力低下を速やかに防止する一方、ベルト２０の張力が増大したときには、回動部材２及びテンションプーリ８に大きい抵抗力を付与してベルト２０のばたつきを防止することができる。   When the fixing member 1 of the auto tensioner is fixed to a fixed body and the belt 20 is wound around the tension pulley 8, the rotating member 2 is urged to rotate with respect to the fixing member 1 by the torsion torque of the torsion coil spring 3. The tension pulley 8 presses the belt 20 by this rotation bias, and tension is applied to the belt 20. When the tension of the belt 20 decreases, the rotating member presses the belt 20 so that the tension pulley presses the belt 20 by the torsional torque (rotating biasing force) of the torsion coil spring 3 (in FIG. 2). When the tension of the belt 20 increases while the belt 20 rotates in the clockwise direction, the tension pulley 20 is pressed by the belt 20 and the rotating member 2 presses the belt 20 against the torsional torque of the torsion coil spring 3. It rotates in the opposite direction (counterclockwise direction in FIG. 2). The rotation of the rotating member 2 is attenuated by the three damping means, that is, the resin coating material 1e, the spring support 8, and the thrust washer 14. This damping force is reduced by a decrease in the reaction force of the torsion coil spring 3 when the tension of the belt 20 is reduced. On the other hand, a reaction force of the torsion torque of the torsion coil spring 3 is increased when the tension of the belt 20 is increased. Increased by increasing As a result, when the tension of the belt 20 decreases, the rotating member 2 easily rotates and the followability of the tension pulley 8 with respect to the belt 20 increases, thereby promptly preventing a decrease in the tension of the belt 20. On the other hand, when the tension of the belt 20 increases, a large resistance force can be applied to the rotating member 2 and the tension pulley 8 to prevent the belt 20 from flapping.

したがって、上記実施形態では、固定部材１の軸部１ｂと回動部材２の嵌合孔２ｄとの間に設けられた減衰手段が、該固定部材１の軸部１ｂの外周面にコーティングされた樹脂コーティング材１ｅで構成され、この樹脂コーティング材１ｅは、通常、固定部材１の軸部１ｂに薄膜（数百μｍ程度）で略均一にコーティングすることができるので、固定部材１の軸部１ｂと回動部材２の嵌合孔２ｄとを直接嵌合させるのと略同じ嵌合精度が得られ、回動部材２が正規の状態（図１ではアーム部２ｅが水平方向に延びた状態）から傾くのを防止することができる。この結果、テンションプーリ８がベルト２０幅方向にずれてベルト２０がテンションプーリ８から外れるようなことはない。   Therefore, in the above embodiment, the damping means provided between the shaft portion 1b of the fixing member 1 and the fitting hole 2d of the rotating member 2 is coated on the outer peripheral surface of the shaft portion 1b of the fixing member 1. Since the resin coating material 1e can be coated almost uniformly on the shaft portion 1b of the fixing member 1 with a thin film (about several hundred μm), the shaft portion 1b of the fixing member 1 is normally formed. And the fitting hole 2d of the rotating member 2 can be obtained with substantially the same fitting accuracy, and the rotating member 2 is in a normal state (in FIG. 1, the arm portion 2e extends in the horizontal direction). Can be prevented from tilting. As a result, the tension pulley 8 is not displaced in the width direction of the belt 20 and the belt 20 is not detached from the tension pulley 8.

また、固定部材１の軸部１ｂの外周面に樹脂コーティング材１ｅをコーティングすることで、減衰手段が、従来のインサートベアリングのように固定部材１とは別部品とならずに済み、固定部材１と一体のものとすることができ、この結果、部品点数を減らして、組立工数を低減することができる。   Further, by coating the outer peripheral surface of the shaft portion 1b of the fixing member 1 with the resin coating material 1e, the damping means does not have to be a separate component from the fixing member 1 as in the conventional insert bearing. As a result, the number of parts can be reduced and the number of assembling steps can be reduced.

尚、上記実施形態では、固定部材１の軸部１ｂと回動部材２の嵌合孔２ｄとの間に設けられた減衰手段を、固定部材１の軸部１ｅの外周面にコーティングされた樹脂コーティング材１ｅで構成したが、これに代えて、回動部材２の嵌合孔２ｄの内周面にコーティングされた樹脂コーティング材で構成するようにしてもよい。   In the above-described embodiment, the damping means provided between the shaft portion 1b of the fixing member 1 and the fitting hole 2d of the rotating member 2 is coated on the outer peripheral surface of the shaft portion 1e of the fixing member 1. Although the coating material 1e is used, instead of this, a resin coating material coated on the inner peripheral surface of the fitting hole 2d of the rotating member 2 may be used.

また、上記実施形態では、３つの減衰手段を設けたが、固定部材１の軸部１ａと回動部材２の嵌合孔２ｄとの間の減衰手段（樹脂コーティング材１ｅ）があれば、他の減衰手段はどのようなものであってもよい。また、他の減衰手段をなくしてもよく、更に他の減衰手段を追加してもよい。   Moreover, in the said embodiment, although three attenuation | damping means were provided, if there exists attenuation | damping means (resin coating material 1e) between the axial part 1a of the fixing member 1, and the fitting hole 2d of the rotation member 2, others will be provided. Any attenuation means may be used. Further, other attenuation means may be omitted, and other attenuation means may be added.

さらにまた、上記実施形態では、回動部材を固定部材に対し回動付勢する付勢手段として捩りコイルばねを用いたが、この付勢手段はどのようなものであってもよく、例えば引張コイルばねや板ばね等を用いてもよい。   Furthermore, in the above embodiment, the torsion coil spring is used as the urging means for urging and urging the rotating member with respect to the fixed member. A coil spring, a leaf spring, or the like may be used.

本発明のオートテンショナは、自動車のエンジンの出力軸により複数のエンジン補機をベルトを介して駆動する補機駆動システム等においてベルトの張力を自動的に調整するのに有用である。   The auto tensioner of the present invention is useful for automatically adjusting the belt tension in an accessory drive system or the like that drives a plurality of engine accessories via a belt by an output shaft of an automobile engine.

本発明の実施形態に係るオートテンショナを示す断面図（図２のＩ−Ｉ線断面図）である。It is sectional drawing (II sectional view taken on the line of FIG. 2) which shows the auto tensioner which concerns on embodiment of this invention. オートテンショナの平面図である。It is a top view of an auto tensioner.

符号の説明Explanation of symbols

１ 固定部材
１ｂ 軸部
１ｅ 樹脂コーティング材（減衰手段）
２ 回動部材
２ｄ 嵌合孔
３ 捩りコイルばね（付勢手段）
４ スプリングサポート（減衰手段）
８ テンションプーリ
１４ スラストワッシャ（減衰手段）
２０ ベルト 1 Fixing member 1b Shaft 1e Resin coating material (attenuating means)
2 Rotating member 2d Fitting hole 3 Torsion coil spring (biasing means)
4 Spring support (damping means)
8 Tension pulley 14 Thrust washer (damping means)
20 belts

Claims (2)

軸部を有する固定部材と、
上記固定部材の軸部と嵌合する嵌合孔を有し、該嵌合により該固定部材の軸部に回動可能に支持された回動部材と、
上記回動部材に、該回動部材の回動軸心と平行な軸心回りに回転自在となるように支持され、ベルトが巻き掛けられるテンションプーリと、
上記固定部材と回動部材との間に連結され、該回動部材を固定部材に対し上記テンションプーリが上記ベルトを押圧する方向に回動付勢する付勢手段と、
少なくとも上記固定部材の軸部と回動部材の嵌合孔との間に設けられ、該回動部材の回動を減衰させる減衰手段とを備え、上記ベルトの張力を自動的に調整するようにしたオートテンショナであって、
上記固定部材の軸部と回動部材の嵌合孔との間に設けられた減衰手段は、該固定部材の軸部の外周面又は回動部材の嵌合孔の内周面にコーティングされた樹脂コーティング材で構成されていることを特徴とするオートテンショナ。 A fixing member having a shaft portion;
A rotating member having a fitting hole for fitting with the shaft portion of the fixing member, and rotatably supported by the shaft portion of the fixing member by the fitting;
A tension pulley that is supported by the rotating member so as to be rotatable about an axis parallel to the rotating axis of the rotating member, and on which a belt is wound;
An urging unit coupled between the fixing member and the rotating member, and urging the rotating member in a direction in which the tension pulley presses the belt against the fixing member;
A damping means is provided at least between the shaft portion of the fixed member and the fitting hole of the rotating member, and attenuates the rotation of the rotating member, so as to automatically adjust the tension of the belt. Auto tensioner,
The attenuation means provided between the shaft portion of the fixing member and the fitting hole of the rotating member is coated on the outer peripheral surface of the shaft portion of the fixing member or the inner peripheral surface of the fitting hole of the rotating member. An auto tensioner comprising a resin coating material. 請求項１記載のオートテンショナにおいて、
樹脂コーティング材は、ポリエーテルエーテルケトンからなることを特徴とするオートテンショナ。 The auto tensioner according to claim 1,
The auto-tensioner is characterized in that the resin coating material is made of polyetheretherketone.
JP2003275339A 2003-07-16 2003-07-16 Auto tensioner Pending JP2005036913A (en)

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2012503160A (en) * 2008-09-18 2012-02-02 ザ ゲイツ コーポレイション Tensioner

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2012503160A (en) * 2008-09-18 2012-02-02 ザ ゲイツ コーポレイション Tensioner

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