JP2891446B2 - Auto tensioner - Google Patents

Auto tensioner

Info

Publication number
JP2891446B2
JP2891446B2 JP5164777A JP16477793A JP2891446B2 JP 2891446 B2 JP2891446 B2 JP 2891446B2 JP 5164777 A JP5164777 A JP 5164777A JP 16477793 A JP16477793 A JP 16477793A JP 2891446 B2 JP2891446 B2 JP 2891446B2
Authority
JP
Japan
Prior art keywords
eccentric member
fixed
belt
bracket
pulley
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.)
Expired - Fee Related
Application number
JP5164777A
Other languages
Japanese (ja)
Other versions
JPH0719303A (en
Inventor
康 門田
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.)
Koyo Seiko Co Ltd
Original Assignee
Koyo Seiko 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 Koyo Seiko Co Ltd filed Critical Koyo Seiko Co Ltd
Priority to JP5164777A priority Critical patent/JP2891446B2/en
Publication of JPH0719303A publication Critical patent/JPH0719303A/en
Application granted granted Critical
Publication of JP2891446B2 publication Critical patent/JP2891446B2/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
    • F16H7/10—Means for varying tension of belts, ropes, or chains by adjusting the axis of a pulley
    • F16H7/12—Means for varying tension of belts, ropes, or chains by adjusting the axis of a pulley of an idle pulley
    • F16H7/1254—Means for varying tension of belts, ropes, or chains by adjusting the axis of a pulley of an idle pulley without vibration damping means
    • F16H7/1281—Means for varying tension of belts, ropes, or chains by adjusting the axis of a pulley of an idle pulley without vibration damping means where the axis of the pulley moves along a substantially circular path
    • 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
    • F16H2007/0808—Extension coil springs

Landscapes

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

Description

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

【０００１】[0001]

【産業上の利用分野】この発明は、プーリに巻き掛けら
れたベルトに、所定の張力を付与するオートテンショナ
に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an auto tensioner for applying a predetermined tension to a belt wound around a pulley.

【０００２】[0002]

【従来の技術】従来、例えば自動車のオルターネータ、
クーラポンプ、及びパワーステアリングポンプ等の複数
の補機間に巻き掛けられたベルトの張力を一定にするた
めに、オートテンショナが用いられている。図４は、従
来のオートテンショナの一例を示す正面図である。この
オートテンショナは、支軸９１によってエンジン等の固
定部Ａに固定されるスリーブ９２に、偏心リング状の偏
心部材９３を、偏心させた状態で揺動自在に嵌合し、こ
の偏心部材９３の外周に、軸受を介してプーリ９４を回
転自在に取付けていると共に、上記偏心部材９３に固定
したブラケット９５と固定部Ａとの間に、引張コイルば
ね９６を張設して、ブラケット９５を引張ることによ
り、偏心部材９３を回動付勢して、プーリ９４をベルト
Ｂに圧接させる構成である。2. Description of the Related Art Conventionally, for example, alternators for automobiles,
An auto-tensioner is used to keep the tension of a belt wound around a plurality of accessories such as a cooler pump and a power steering pump constant. FIG. 4 is a front view showing an example of a conventional auto tensioner. In this auto tensioner, an eccentric ring-shaped eccentric member 93 is swingably fitted in an eccentric state to a sleeve 92 fixed to a fixed portion A of an engine or the like by a support shaft 91. A pulley 94 is rotatably mounted on the outer periphery via a bearing, and a tension coil spring 96 is stretched between the bracket 95 fixed to the eccentric member 93 and the fixed portion A to pull the bracket 95. Thereby, the eccentric member 93 is rotationally biased to press the pulley 94 against the belt B.

【０００３】[0003]

【発明が解決しようとする課題】上記ベルトＢとプーリ
９４との圧接位置は、ベルトＢの全長のばらつき、ベル
トＢを巻き掛けたプーリの相対位置のばらつき、及びプ
ーリ外径の製作誤差等の累積により、初期においてベル
トＢの圧接方向に沿って１ｍｍ程度の範囲で変動する
（図４二点鎖線参照）。ところが、上記オートテンショ
ナは、偏心部材９３の揺動中心位置が不変であるので、
上記圧接位置の変動に対応させるために、プーリ９４を
偏心部材９３の揺動中心回りに所定角度θの範囲で回動
させる必要がある。このため、ベルトＢとプーリ９４と
の圧接位置の変動に応じて、ばね９６の初期設定長さＬ
が変化することになり、これに伴って、プーリ９４によ
るベルトＢの押圧力が製品毎に変動して、ベルトの張力
を一定にするというオートテンショナ本来の機能を有効
に発揮することができないという問題があった。The pressure contact position between the belt B and the pulley 94 depends on variations in the overall length of the belt B, variations in the relative position of the pulley around which the belt B is wound, and manufacturing errors in the outer diameter of the pulley. Due to the accumulation, it initially fluctuates within a range of about 1 mm along the pressing direction of the belt B (see a two-dot chain line in FIG. 4). However, in the above-described auto tensioner, since the center position of the swing of the eccentric member 93 is invariable,
In order to cope with the fluctuation of the pressed position, it is necessary to rotate the pulley 94 around the swing center of the eccentric member 93 within a predetermined angle θ. For this reason, the initial set length L of the spring 96 is changed according to the change of the pressure contact position between the belt B and the pulley 94.
, And the pressing force of the belt B by the pulley 94 fluctuates from product to product, and the original function of the auto tensioner, which keeps the belt tension constant, cannot be effectively exhibited. There was a problem.

【０００４】この発明は、上記問題点に鑑みてなされた
ものであり、ベルトとプーリとの圧接位置の変動による
影響を受けることなく、ベルトを常に一定張力に調節す
ることができるオートテンショナを提供することを目的
とする。The present invention has been made in view of the above problems, and provides an automatic tensioner that can constantly adjust a belt to a constant tension without being affected by a change in a pressure contact position between a belt and a pulley. The purpose is to do.

【０００５】[0005]

【課題を解決するための手段】上記目的を達成するため
の、この発明のオートテンショナは、固定部に取付けら
れる支軸と、支軸の外周に偏心させた状態で回動調整可
能に嵌合され、当該支軸によって固定部に固定される偏
心筒状の固定偏心部材と、固定偏心部材の外周に偏心さ
せた状態で揺動自在に嵌合された可動偏心部材と、可動
偏心部材に回転自在に支持されたプーリと、可動偏心部
材に固定されたブラケットと、固定部とブラケットとの
間に張設され、プーリがベルトに圧接する方向に可動偏
心部材を回動付勢するばねと、固定偏心部材の回動調整
時に可動偏心部材又はブラケットを突き当てて、当該固
定偏心部材の回動位置を位置決めするストッパーとを具
備することを特徴とするものである。In order to achieve the above object, an automatic tensioner according to the present invention is fitted to a support shaft attached to a fixed portion so as to be rotatable and adjustable while being eccentric to the outer periphery of the support shaft. An eccentric tubular fixed eccentric member fixed to the fixed portion by the support shaft, a movable eccentric member eccentrically fitted to the outer periphery of the fixed eccentric member and swingably fitted thereto, and a rotating eccentric member. A freely supported pulley, a bracket fixed to the movable eccentric member, a spring stretched between the fixed portion and the bracket, and a spring for biasing the movable eccentric member in a direction in which the pulley presses against the belt; A stopper is provided for abutting a movable eccentric member or a bracket at the time of rotation adjustment of the fixed eccentric member and positioning a rotation position of the fixed eccentric member.

【０００６】[0006]

【作用】上記の構成のオートテンショナによれば、固定
偏心部材を支軸によって固定部に仮止めした状態で、ブ
ラケットと固定部との間にばねを張設することにより、
可動偏心部材を、当該ばねの付勢力によって固定偏心部
材を中心にベルト側に回動させて、プーリをベルトに接
触させることができ、この状態で、固定部材を回動調整
すると、可動偏心部材が当該固定偏心部材に対して偏心
しているので、可動偏心部材の揺動中心位置を移動させ
ることができる。そこで、可動偏心部材の揺動中心がベ
ルトに接近する方向に、固定偏心部材を回動調整すれ
ば、ベルトからの反力によって、可動偏心部材がばねの
付勢力に抗して上記揺動中心回りに回動されることにな
る。従って、可動偏心部材又はブラケットがストッパー
に突き当たるまで固定偏心部材を回動調整し、この状態
で当該固定偏心部材を固定部に位置決め固定すれば、上
記ばねを常に一定の長さに初期設定することができる。According to the auto-tensioner having the above structure, the spring is stretched between the bracket and the fixed portion while the fixed eccentric member is temporarily fixed to the fixed portion by the support shaft.
By rotating the movable eccentric member toward the belt around the fixed eccentric member by the urging force of the spring, the pulley can be brought into contact with the belt. In this state, when the fixed member is rotationally adjusted, the movable eccentric member Is eccentric with respect to the fixed eccentric member, so that the swing center position of the movable eccentric member can be moved. Accordingly, if the fixed eccentric member is rotationally adjusted in a direction in which the swing center of the movable eccentric member approaches the belt, the movable eccentric member is opposed to the biasing force of the spring by the reaction force from the belt. It will be pivoted around. Accordingly, if the fixed eccentric member is rotationally adjusted until the movable eccentric member or the bracket abuts the stopper, and the fixed eccentric member is positioned and fixed to the fixed portion in this state, the spring is always initialized to a fixed length. Can be.

【０００７】[0007]

【実施例】以下、実施例を示す添付図面により詳細に説
明する。図１は、この発明のオートテンショナの一実施
例を示す断面図であり、図２は正面図である。このオー
トテンショナは、支軸１によってエンジン等の固定部Ａ
に固定された固定偏心部材２の外周に、可動偏心部材３
を回動自在に嵌挿し、この可動偏心部材３の外周に、転
がり軸受４を介してプーリ５を回転自在に取付け、上記
可動偏心部材３にブラケット６を一体回転可能に取付け
ている。BRIEF DESCRIPTION OF THE DRAWINGS FIG. FIG. 1 is a sectional view showing an embodiment of the auto tensioner of the present invention, and FIG. 2 is a front view. This auto-tensioner uses a support shaft 1 to secure a fixed portion A of an engine or the like.
The movable eccentric member 3 is fixed to the outer periphery of the fixed eccentric member 2
Is rotatably fitted, a pulley 5 is rotatably mounted on the outer periphery of the movable eccentric member 3 via a rolling bearing 4, and a bracket 6 is mounted on the movable eccentric member 3 so as to be integrally rotatable.

【０００８】上記支軸１は、ボルトによって構成されて
おり、固定偏心部材２を挿通した状態で、固定部Ａにね
じ込まれて固定されている。固定偏心部材２は、内周を
外周に対して偏心させた偏心筒状のものであり、その軸
心Ｑ２を支軸１の軸心Ｑ１に対して偏心させた状態で、
当該支軸１の外周に回動調整可能に嵌合されている。こ
の固定偏心部材２の両端には、側板２１，２２が配設さ
れており、これら側板２１，２２は、それぞれの内周側
に突設された短筒部２１ａ，２２ａを、固定偏心部材２
の内周に圧入することによって、当該固定偏心部材２と
一体回動可能になっている。また、一方の側板２１に
は、舌片２１ｂが突設されており、この舌片２１ｂに
は、固定偏心部材２を回動調整するための工具を係合す
る係合孔２１ｃが貫通形成されている。The support shaft 1 is formed by bolts, and is screwed and fixed to the fixing portion A with the fixed eccentric member 2 inserted. The fixed eccentric member 2 is an eccentric cylindrical member whose inner periphery is eccentric with respect to the outer periphery, and in a state where its axis Q2 is eccentric with respect to the axis Q1 of the support shaft 1,
It is fitted on the outer periphery of the support shaft 1 so as to be able to adjust the rotation. Side plates 21 and 22 are disposed at both ends of the fixed eccentric member 2, and the side plates 21 and 22 respectively connect the short cylindrical portions 21a and 22a protruding from the inner peripheral side to the fixed eccentric member 2.
Is press-fitted into the inner periphery of the fixed eccentric member 2 so as to be integrally rotatable. A tongue piece 21b protrudes from one of the side plates 21, and an engagement hole 21c for engaging a tool for adjusting the rotation of the fixed eccentric member 2 is formed through the tongue piece 21b. ing.

【０００９】可動偏心部材３は、スリーブ３１の端部外
周に偏心リング３２を圧入したものであり、上記スリー
ブ３１は、環状の摩擦部材２３を介して固定偏心部材２
に揺動自在に嵌挿されている。このスリーブ３１の軸心
は、固定偏心部材２の軸心Ｑ２と同心であり、偏心リン
グ３２の軸心Ｑ３は、固定偏心部材２の軸心Ｑ２に対し
て偏心している。従って、可動偏心部材３の偏心リング
３２は、固定偏心部材２の軸心Ｑ２を中心に揺動可能で
あり、固定偏心部材２を、支軸１の軸心Ｑ１を中心に回
動調整することにより、揺動中心を移動調整することが
できる。なお、上記偏心リング３２は、転がり軸受４の
内輪を兼用しているものであり、その外周に軌道４１が
形成されている。The movable eccentric member 3 is formed by press-fitting an eccentric ring 32 around the outer periphery of an end of a sleeve 31. The sleeve 31 is fixedly eccentric member 2 via an annular friction member 23.
Is swingably inserted into the housing. The axis of the sleeve 31 is concentric with the axis Q2 of the fixed eccentric member 2, and the axis Q3 of the eccentric ring 32 is eccentric with respect to the axis Q2 of the fixed eccentric member 2. Therefore, the eccentric ring 32 of the movable eccentric member 3 can swing about the axis Q2 of the fixed eccentric member 2, and the fixed eccentric member 2 can be rotated and adjusted about the axis Q1 of the support shaft 1. Thus, the swing center can be moved and adjusted. The eccentric ring 32 also serves as an inner ring of the rolling bearing 4, and a track 41 is formed on the outer periphery thereof.

【００１０】ブラケット６は、上記可動偏心部材３のス
リーブ３１の外周に一体回動可能に嵌合されているもの
であり、スリーブ３１の外周に圧入される環状の基部６
１と、この基部６１から斜め上方に延びるアーム６２と
を備えている（図３参照）。そして、上記アーム６２の
先端と固定部Ａとの間には、プーリ５がベルトＢを圧接
する方向に可動偏心部材３を回動付勢する引張コイルば
ね７が張設されている。また、上記固定部Ａには、ブラ
ケット６のアーム６２を突き当てるためのピン状のスト
ッパー８が突設されている。このストッパー８は固定部
Ａに対して、抜取り可能に挿入されている。The bracket 6 is fitted to the outer periphery of the sleeve 31 of the movable eccentric member 3 so as to be integrally rotatable, and has an annular base 6 that is press-fitted into the outer periphery of the sleeve 31.
1 and an arm 62 extending obliquely upward from the base 61 (see FIG. 3). A tension coil spring 7 for rotatingly biasing the movable eccentric member 3 in a direction in which the pulley 5 presses the belt B is stretched between the tip of the arm 62 and the fixed portion A. Further, a pin-shaped stopper 8 for projecting the arm 62 of the bracket 6 is provided on the fixing portion A so as to protrude. The stopper 8 is removably inserted into the fixed portion A.

【００１１】以上の構成であれば、支軸１によって固定
偏心部材２を固定部Ａに仮止めした状態で、固定部Ａと
ブラケット６との間に引張コイルばね７を張設すること
により、当該引張コイルばね７の引張力によって、可動
偏心部材３を固定偏心部材２の軸心Ｑ２を中心に、図２
において時計回りに回動させて、プーリ５をベルトＢに
接触させることができる。次に、工具を側板２１の係合
孔２１ｃに係合させて、可動偏心部材３の揺動中心Ｑ２
がベルトＢに接近するように、固定偏心部材２を時計回
りに回動調整すれば、ベルトＢからの反力によって、可
動偏心部材３を反時計回りに回動させることができる。
そして、ブラケット６のアーム６２がストッパー８に突
き当たった時点で、固定偏心部材２の回動を停止して、
支軸１をさらにねじ込んで固定偏心部材２を位置決め固
定することにより、上記引張コイルばね７を常に一定の
初期設定長さＬに設定することができる。従って、ベル
トＢの全長のばらつき等によってベルトＢとプーリ５と
の圧接位置が変動しても、ベルトＢをオートテンショナ
によって一定圧力で押圧することができる。なお、上記
ストッパー８については、固定偏心部材２を固定した
後、固定部Ａから引き抜いておく。With the above construction, the tension coil spring 7 is stretched between the fixed portion A and the bracket 6 while the fixed eccentric member 2 is temporarily fixed to the fixed portion A by the support shaft 1. Due to the tensile force of the tension coil spring 7, the movable eccentric member 3 is moved around the axis Q2 of the fixed eccentric member 2 as shown in FIG.
, The pulley 5 can be brought into contact with the belt B by rotating clockwise. Next, the tool is engaged with the engagement hole 21c of the side plate 21, and the swing center Q2 of the movable eccentric member 3 is moved.
If the fixed eccentric member 2 is rotationally adjusted clockwise so as to approach the belt B, the movable eccentric member 3 can be rotated counterclockwise by the reaction force from the belt B.
When the arm 62 of the bracket 6 hits the stopper 8, the rotation of the fixed eccentric member 2 is stopped,
By further screwing the support shaft 1 and positioning and fixing the fixed eccentric member 2, the tension coil spring 7 can always be set to a constant initial set length L. Therefore, even if the pressure contact position between the belt B and the pulley 5 fluctuates due to variations in the overall length of the belt B, the belt B can be pressed with a constant pressure by the automatic tensioner. The stopper 8 is pulled out from the fixed portion A after the fixed eccentric member 2 is fixed.

【００１２】この発明のオートテンショナは、上記実施
例に限定されるものでなく、例えば、上記ストッパー８
は、可動偏心部材３の所定部を突き当てるものであって
もよく、また、固定部Ａ以外の例えば自動組立装置側に
設けられていてもよい。The auto-tensioner according to the present invention is not limited to the above embodiment.
May abut a predetermined portion of the movable eccentric member 3, or may be provided, for example, on the automatic assembly device side other than the fixed portion A.

【００１３】[0013]

【発明の効果】以上のように、この発明のオートテンシ
ョナによれば、ベルトとプーリとの圧接位置が変動して
も、ブラケットと固定部との間に張設されたばねの初期
設定長さを一定にすることができるので、ベルトを常に
一定張力に調節することができるという特有の効果を奏
する。As described above, according to the auto tensioner of the present invention, even if the pressure contact position between the belt and the pulley fluctuates, the initial setting length of the spring stretched between the bracket and the fixing portion can be reduced. Since the belt can be kept constant, it has a unique effect that the belt can always be adjusted to a constant tension.

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

【図１】この発明のオートテンショナの一実施例を示す
断面図である。FIG. 1 is a sectional view showing one embodiment of an auto tensioner of the present invention.

【図２】同じく正面図である。FIG. 2 is a front view of the same.

【図３】同じく背面図である。FIG. 3 is a rear view of the same.

【図４】従来例を示す正面図である。FIG. 4 is a front view showing a conventional example.

【符号の説明】[Explanation of symbols]

１ 支軸 ２ 固定偏心部材 ３ 可動偏心部材 ５ プーリ ６ ブラケット ７ 引張コイルばね ８ ストッパー Ａ 固定部 DESCRIPTION OF SYMBOLS 1 Support shaft 2 Fixed eccentric member 3 Movable eccentric member 5 Pulley 6 Bracket 7 Tension coil spring 8 Stopper A Fixed part

Claims (1)

(57)【特許請求の範囲】(57) [Claims] 【請求項１】固定部に取付けられる支軸と、 支軸の外周に偏心させた状態で回動調整可能に嵌合さ
れ、当該支軸によって固定部に固定される偏心筒状の固
定偏心部材と、 固定偏心部材の外周に偏心させた状態で揺動自在に嵌合
された可動偏心部材と、 可動偏心部材に回転自在に支持されたプーリと、 可動偏心部材に固定されたブラケットと、 固定部とブラケットとの間に張設され、プーリがベルト
に圧接する方向に可動偏心部材を回動付勢するばねと、 固定偏心部材の回動調整時に可動偏心部材又はブラケッ
トを突き当てて、当該固定偏心部材の回動位置を位置決
めするストッパーとを具備することを特徴とするオート
テンショナ。An eccentric tubular fixed eccentric member fitted to a support shaft attached to a fixed portion so as to be rotatable and adjustable on an outer periphery of the support shaft and fixed to the fixed portion by the support shaft. A movable eccentric member that is swingably fitted to the outer periphery of the fixed eccentric member, a pulley rotatably supported by the movable eccentric member, a bracket fixed to the movable eccentric member, and fixed. A spring that is stretched between the section and the bracket, and that urges the movable eccentric member to rotate in a direction in which the pulley presses against the belt; and abuts the movable eccentric member or the bracket when rotating the fixed eccentric member. An auto-tensioner comprising: a stopper for positioning a rotation position of a fixed eccentric member.
JP5164777A 1993-07-02 1993-07-02 Auto tensioner Expired - Fee Related JP2891446B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP5164777A JP2891446B2 (en) 1993-07-02 1993-07-02 Auto tensioner

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP5164777A JP2891446B2 (en) 1993-07-02 1993-07-02 Auto tensioner

Publications (2)

Publication Number Publication Date
JPH0719303A JPH0719303A (en) 1995-01-20
JP2891446B2 true JP2891446B2 (en) 1999-05-17

Family

ID=15799748

Family Applications (1)

Application Number Title Priority Date Filing Date
JP5164777A Expired - Fee Related JP2891446B2 (en) 1993-07-02 1993-07-02 Auto tensioner

Country Status (1)

Country Link
JP (1) JP2891446B2 (en)

Also Published As

Publication number Publication date
JPH0719303A (en) 1995-01-20

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