JPH0960697A - Automatic tensioner - Google Patents
Automatic tensionerInfo
- Publication number
- JPH0960697A JPH0960697A JP21789995A JP21789995A JPH0960697A JP H0960697 A JPH0960697 A JP H0960697A JP 21789995 A JP21789995 A JP 21789995A JP 21789995 A JP21789995 A JP 21789995A JP H0960697 A JPH0960697 A JP H0960697A
- Authority
- JP
- Japan
- Prior art keywords
- rod
- housing
- braking body
- fixed
- braking
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
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
- F16H7/0829—Means for varying tension of belts, ropes, or chains with vibration damping means
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、無端ベルトや無端
チェーンのような動力伝達用の無端伝動帯にプーリやス
プロケットのような押圧部材を弾発的に当接させて所定
の張力を与えるためのオートテンショナーに関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention is for elastically abutting a pressing member such as a pulley or sprocket to an endless power transmission belt for power transmission such as an endless belt or an endless chain to give a predetermined tension. Auto tensioner.
【０００２】[0002]
【従来の技術】かかるオートテンショナーは、例えば実
開昭６４−４１７５６号公報、特開平６−１３７３８９
号公報により公知である。2. Description of the Related Art Such an automatic tensioner is disclosed, for example, in Japanese Utility Model Laid-Open No. 64-41756, and Japanese Patent Laid-Open No. 6-137389.
It is publicly known from Japanese Patent Publication No.
【０００３】上記実開昭６４−４１７５６号公報に記載
されたオートテンショナーは、ハウジングの内周面に形
成した雌ねじにロッドの外周面に形成した雄ねじを螺合
させるとともに、スプリングでハウジングから前進する
方向に付勢した前記ロッドの先端に無端ベルトに当接す
るプーリを支持した構造を有している。そして、無端ベ
ルトの張力変化に伴ってロッドが回転しながらハウジン
グに対して進退するとき、前進時の荷重と後退時の荷重
との間に所定のヒステリシスを与えるべく、前記雌ねじ
及び雄ねじのネジ山の形状を前後非対称にしている。The automatic tensioner described in Japanese Utility Model Laid-Open No. 64-41756 has a female screw formed on the inner peripheral surface of the housing screwed with a male screw formed on the outer peripheral surface of the rod, and is advanced from the housing by a spring. It has a structure in which a pulley abutting against the endless belt is supported at the tip of the rod biased in the direction. Then, when the rod moves forward and backward with respect to the housing while rotating with the tension change of the endless belt, in order to give a predetermined hysteresis between the load during forward movement and the load during backward movement, the threads of the internal thread and the external thread are given. Is asymmetrical in the front and rear.
【０００４】また上記特開平６−１３７３８９号公報に
記載されたオートテンショナーは、ハウジングの内部に
配置した有底円筒状のバルブスリーブにロッドと一体の
プランジャを摺動自在に嵌合させ、バルブスリーブの底
部に設けた油室の内外をオリフィス及び前記プランジャ
に設けた一方向弁を介して連通させ、更にスプリングで
ハウジングから前進する方向に付勢した前記ロッドの先
端に無端ベルトの背面に当接するプーリを支持した構造
を有している。そして、無端ベルトの張力変化に伴って
ロッドがハウジングに対して進退するとき、一方向弁の
開閉により前進時の荷重と後退時の荷重との間に所定の
ヒステリシスを与えるようになっている。Further, in the auto tensioner described in the above-mentioned Japanese Patent Laid-Open No. 6-137389, a plunger integral with a rod is slidably fitted in a cylindrical valve sleeve having a bottom disposed inside a housing, and the valve sleeve The inside and outside of the oil chamber provided at the bottom of the endless belt are communicated with each other through an orifice and a one-way valve provided at the plunger, and the tip of the rod urged by a spring in the direction of advancing from the housing contacts the back surface of the endless belt. It has a structure that supports a pulley. When the rod moves forward and backward with respect to the housing due to the change in tension of the endless belt, a predetermined hysteresis is given between the forward load and the backward load by opening and closing the one-way valve.
【０００５】[0005]
【発明が解決しようとする課題】しかしながら、上記前
者のオートテンショナーはロッドが回転しながら進退す
るため、ロッドが回転してもプーリの軸受け部が回転し
ないように考慮する必要があり、そのために構造が複雑
化する問題があった。また上記後者のオートテンショナ
ーは油圧式であるため、作動油の漏れを防止するために
取付姿勢が制限されるという問題があった。However, in the former autotensioner, the rod moves forward and backward while rotating, so it is necessary to consider that the bearing portion of the pulley does not rotate even if the rod rotates. There was a problem that became complicated. Further, since the latter automatic tensioner is of a hydraulic type, there is a problem that the mounting posture is restricted in order to prevent leakage of hydraulic oil.
【０００６】本発明は前述の事情に鑑みてなされたもの
で、構造が簡単で取付姿勢が自由でありながら、ロッド
が進退する際の荷重に所定のヒステリシスを与えること
が可能なオートテンショナーを提供することを目的とす
る。The present invention has been made in view of the above circumstances, and provides an autotensioner capable of giving a predetermined hysteresis to a load when a rod advances and retracts while having a simple structure and a free mounting posture. The purpose is to do.
【０００７】[0007]
【課題を解決するための手段】前記目的を達成するため
に、請求項１に記載された発明は、周壁及び一対の端壁
を有する概略筒状のハウジングと、ハウジングに該ハウ
ジングの軸線に沿って進退可能且つ回転不能に支持され
たロッドと、ハウジングの内部に収納されて該ハウジン
グの一方の端壁からロッドを前進させる方向に付勢する
弾発部材と、ハウジングの一方の端壁から延出するロッ
ドの一端部に支持されて無端伝動帯の背面に弾発的に当
接する押圧部材と、ハウジングの内部に収納されてロッ
ドが前進するときの荷重及び後退するときの荷重間にヒ
ステリシスを与える制動手段とを備えたオートテンショ
ナーであって、前記制動手段はロッドに形成したネジ部
に螺合して該ロッドの進退により回転する回転制動体
と、ハウジングに固設されて回転制動体に摺接する固定
制動体とを備えてなり、前記弾発部材はロッドに設けた
弾発部材受け部と回転制動体との間に配置されて該回転
制動体を固定制動体に圧接する方向に付勢することを特
徴とする。In order to achieve the above object, the invention described in claim 1 has a substantially cylindrical housing having a peripheral wall and a pair of end walls, and the housing is provided along an axis of the housing. And a non-rotatably supported rod, an elastic member that is housed inside the housing and urges the rod from one end wall of the housing in a direction to advance the rod, and an elastic member that extends from one end wall of the housing. There is a hysteresis between the pressing member that is supported by one end of the rod that comes out and elastically abuts against the back surface of the endless transmission belt, and the load when the rod is housed inside the housing and when the rod advances and retracts. An auto-tensioner having a braking means for giving the rotation means, wherein the braking means is fixed to a housing by a rotary braking body that is screwed into a threaded portion formed on the rod and rotates by advancing and retracting the rod. And a fixed braking body that is in sliding contact with the rotary braking body, and the elastic member is disposed between the elastic member receiving portion provided on the rod and the rotary braking body to fix the rotary braking body to the fixed braking body. It is characterized in that it is urged in the direction of being pressed against.
【０００８】また請求項２に記載された発明は、請求項
１の構成に加えて、固定制動体はロッドの他端部が遊嵌
する円筒状の部材であって、その一端部においてハウジ
ングの他方の端壁に固定されるとともに、その他端部に
おいて回転制動体に摺接することを特徴とする。According to a second aspect of the present invention, in addition to the structure of the first aspect, the fixed braking body is a cylindrical member into which the other end of the rod is loosely fitted, and the one end of the housing is a housing member. It is characterized in that it is fixed to the other end wall and slidably contacts the rotary braking body at the other end.
【０００９】また請求項３に記載された発明は、請求項
１の構成に加えて、固定制動体はハウジングの周壁内面
から一体に張り出してロッドの他方の端部が遊嵌するフ
ランジ状の部材であることを特徴とする。According to a third aspect of the present invention, in addition to the structure of the first aspect, the fixed braking body is integrally extended from the inner surface of the peripheral wall of the housing, and the other end of the rod is loosely fitted into the flange-shaped member. Is characterized in that.
【００１０】また請求項４に記載された発明は、請求項
１の構成に加えて、回転制動体は有底円筒状の部材であ
って、その底部にロッドのネジ部が螺合するとともに、
その開口部がハウジングの他方の端壁に設けた固定制動
体に摺接することを特徴とする。Further, in the invention described in claim 4, in addition to the structure of claim 1, the rotary braking body is a cylindrical member having a bottom, and the threaded portion of the rod is screwed into the bottom portion thereof,
The opening is in sliding contact with a fixed braking body provided on the other end wall of the housing.
【００１１】また請求項５に記載された発明は、請求項
１の構成に加えて、ロッドは非円形断面のガイド部を有
しており、このガイド部をハウジングの一方の端壁に形
成した非円形断面のガイド孔に挿通したことを特徴とす
る。According to the invention described in claim 5, in addition to the structure of claim 1, the rod has a guide portion having a non-circular cross section, and the guide portion is formed on one end wall of the housing. It is characterized by being inserted into a guide hole having a non-circular cross section.
【００１２】また請求項６に記載された発明は、請求項
１の構成に加えて、ロッドのネジ部のピッチを軸方向に
変化させたことを特徴とする。The invention described in claim 6 is characterized in that, in addition to the structure of claim 1, the pitch of the threaded portion of the rod is changed in the axial direction.
【００１３】また請求項７に記載された発明は、請求項
１の構成に加えて、回転制動体及び固定制動体の摺接面
を非平面として両制動体を相互に嵌合させたことを特徴
とする。According to a seventh aspect of the present invention, in addition to the structure of the first aspect, the sliding contact surfaces of the rotary braking body and the fixed braking body are made non-planar, and both braking bodies are fitted to each other. Characterize.
【００１４】[0014]
【発明の実施例の形態】以下、本発明の実施の形態を、
添付図面に示した本発明の実施例に基づいて説明する。Embodiments of the present invention will be described below.
A description will be given based on an embodiment of the present invention shown in the accompanying drawings.
【００１５】図１〜図４は本発明の第１実施例を示すも
ので、図１はオートテンショナーの全体側面図、図２は
図１の２−２線断面図、図３は図１の３−３線断面図、
図４はロッドの変位と荷重との関係を示すグラフであ
る。1 to 4 show a first embodiment of the present invention. FIG. 1 is an overall side view of an auto tensioner, FIG. 2 is a sectional view taken along line 2-2 of FIG. 1, and FIG. 3 is of FIG. 3-3 line sectional view,
FIG. 4 is a graph showing the relationship between the displacement of the rod and the load.
【００１６】図１に示すように、自動車用エンジンのク
ランク軸の駆動力を発電機等の補器類に伝達する無端ベ
ルトＢの張力を調整するためのオートテンショナーＴ
は、周壁１の軸方向両端部を端壁２，３により閉塞した
円筒状のハウジング４を備える。図２を併せて参照する
と明らかなように、ハウジング４の一方の端壁２には円
の一部を切り欠いた非円形断面のガイド孔２1 が形成さ
れており、このガイド孔２1 にロッド５のガイド部６が
嵌合する。ガイド部６は平坦面６1 を有して前記ガイド
孔２1 と同一の断面形状に形成されており、従って、ロ
ッド５のガイド部６は端壁２のガイド孔２1 に沿って摺
動可能且つ回転不能に案内される。As shown in FIG. 1, an automatic tensioner T for adjusting the tension of an endless belt B for transmitting the driving force of a crankshaft of an automobile engine to auxiliary devices such as a generator.
Includes a cylindrical housing 4 in which both axial ends of the peripheral wall 1 are closed by end walls 2 and 3. As it is apparent Referring also to FIG. 2, the one end wall 2 of the housing 4 has guide holes 2 1 a non-circular cross-section, with parts cut away, of a circle is formed, the guide hole 2 1 The guide portion 6 of the rod 5 is fitted. The guide portion 6 has a flat surface 6 1 and is formed in the same sectional shape as the guide hole 2 1. Therefore, the guide portion 6 of the rod 5 slides along the guide hole 2 1 of the end wall 2. Guided possible and non-rotatable.
【００１７】ハウジング４から外部に延出するガイド部
６の上端にプーリ支持部７がＬ字状に連設されており、
このプーリ支持部７にボールベアリング８及びボルト９
を介して押圧部材としてのプーリ１０が支持される。プ
ーリ１０は前記無端ベルトＢの背面に当接して回転す
る。A pulley supporting portion 7 is connected to the upper end of a guide portion 6 extending from the housing 4 to the outside in an L-shape.
A ball bearing 8 and a bolt 9 are attached to the pulley supporting portion 7.
The pulley 10 as a pressing member is supported via the. The pulley 10 rotates by contacting the back surface of the endless belt B.
【００１８】図１及び図３から明らかなように、ロッド
５のガイド部６の下端には弾発部材受け部としてのフラ
ンジ部１１を介してネジ部１２が形成される。ネジ部１
２の断面形状はガイド部６のそれと同一であるが、その
平坦面１２1 がネジ部１２の外周に沿って螺旋状に形成
されている。これら平坦面６1 ，１２1 を有するガイド
部６及びネジ部１２は、転造によって丸棒材から製造す
ることができる。As is apparent from FIGS. 1 and 3, a screw portion 12 is formed at the lower end of the guide portion 6 of the rod 5 via a flange portion 11 serving as an elastic member receiving portion. Screw part 1
The cross-sectional shape of 2 is the same as that of the guide portion 6, but its flat surface 12 1 is formed in a spiral shape along the outer periphery of the screw portion 12. The guide portion 6 and the screw portion 12 having the flat surfaces 6 1 and 12 1 can be manufactured from a round bar material by rolling.
【００１９】ハウジング４の端壁２のガイド孔２1 と同
一断面形状のネジ孔１３1 を有する円盤状の回転制動体
１３がロッド５のネジ部１２に螺合しており、この回転
制動体１３の上面とフランジ部１１の下面との間に弾発
部材としてのコイルスプリング１４が縮設される。回転
制動体１３は好ましくは合成樹脂製である。A disk-shaped rotary braking body 13 having a screw hole 13 1 having the same cross-sectional shape as the guide hole 2 1 of the end wall 2 of the housing 4 is screwed into the screw portion 12 of the rod 5, and this rotary braking body is provided. A coil spring 14 as an elastic member is contracted between the upper surface of 13 and the lower surface of the flange 11. The rotary braking body 13 is preferably made of synthetic resin.
【００２０】有底円筒状に形成された金属製の固定制動
体１５が、その底部においてハウジング４の端壁３にボ
ルト１６で固定される。固定制動体１５の内部空間１５
1 にはロッド５のネジ部１２が遊嵌するとともに、固定
制動体１５の上面と回転制動体１３の下面とが、摺動面
Ｐを介して摺接する。前記ネジ部１２、回転制動体１３
及び固定制動体１５は本発明の制動手段Ｆを構成する。A fixed braking member 15 made of a metal and having a cylindrical shape with a bottom is fixed to the end wall 3 of the housing 4 with a bolt 16 at the bottom thereof. Internal space 15 of fixed braking body 15
The threaded portion 12 of the rod 5 is loosely fitted in 1 , and the upper surface of the fixed braking body 15 and the lower surface of the rotary braking body 13 are in sliding contact with each other via the sliding surface P. The screw portion 12, the rotation braking body 13
The fixed braking body 15 constitutes the braking means F of the present invention.
【００２１】次に、前述の構成を備えた本発明の実施例
の作用について説明する。Next, the operation of the embodiment of the present invention having the above configuration will be described.
【００２２】ロッド５は回転制動体１３の上面とフラン
ジ部１１の下面との間に縮設したコイルスプリング１４
の弾発力によって前進方向に付勢されており、ロッド５
に支持したプーリ１０は無端ベルトＢの背面に当接して
該無端ベルトＢに張力を与えている。無端ベルトＢの張
力が増加すると、ロッド５はコイルスプリング１４を圧
縮しながら、ガイド部６の平坦面６1 を端壁２のガイド
孔２1 に案内されて回転することなく後退方向に摺動す
る。The rod 5 is a coil spring 14 which is contracted between the upper surface of the rotary braking body 13 and the lower surface of the flange portion 11.
It is urged in the forward direction by the elastic force of the rod 5
The pulley 10 supported by the above contacts the back surface of the endless belt B to give tension to the endless belt B. When the tension of the endless belt B increases, the rod 5 slides in the backward direction without being rotated by the flat surface 6 1 of the guide portion 6 being guided by the guide hole 2 1 of the end wall 2 while compressing the coil spring 14. To do.
【００２３】このとき、オートテンショナーＴが制動手
段Ｆを備えていないと仮定すると、ロッド５を後退させ
るための押圧荷重はコイルスプリング１４の弾発力に等
しく、またロッド５が前進するときの前進荷重もコイル
スプリング１４の弾発力に等しくなる。従って、制動手
段Ｆを備えていない場合には、ロッド５を進退させる荷
重はコイルスプリング１４の変形に伴う弾発力だけに依
存し、図４に破線ａで示すようにヒステリシスは発生し
ない。At this time, assuming that the automatic tensioner T does not include the braking means F, the pressing load for retracting the rod 5 is equal to the elastic force of the coil spring 14, and the forward movement when the rod 5 advances. The load is also equal to the elastic force of the coil spring 14. Therefore, when the braking means F is not provided, the load for advancing and retracting the rod 5 depends only on the elastic force associated with the deformation of the coil spring 14, and hysteresis does not occur as shown by the broken line a in FIG.
【００２４】一方、本発明の如く制動手段Ｆを備えてい
る場合には、ロッド５が後退方向に摺動すると、固定制
動体１５の上面に当接して軸方向の移動を規制された回
転制動体１３は、ロッド５のネジ部１２との螺合により
強制的に回転駆動されるとともに、螺合部に作用する摩
擦力により固定制動体１５の上面に押し付けられる。従
って、回転制動体１３と固定制動体１５との摺動面Ｐに
は、コイルスプリング１４の弾発力に基づく面圧に加え
て、前記ロッド５の後退方向の摺動に伴う面圧が作用
し、摺動面Ｐには回転制動体１３の回転を規制しようと
する摩擦力が発生する。ロッド５の後退量が増加すると
コイルスプリング１４が圧縮されて弾発力が増加するた
め、前記摩擦力はロッド５が後退するに伴って増加す
る。On the other hand, in the case where the braking means F is provided as in the present invention, when the rod 5 slides in the backward direction, it comes into contact with the upper surface of the fixed braking body 15 and the rotational braking whose axial movement is restricted. The body 13 is forcibly rotationally driven by being screwed with the screw portion 12 of the rod 5, and is pressed against the upper surface of the fixed braking body 15 by the frictional force acting on the screwing portion. Therefore, in addition to the surface pressure based on the elastic force of the coil spring 14, the surface pressure associated with the backward sliding of the rod 5 acts on the sliding surface P between the rotary braking body 13 and the fixed braking body 15. However, a frictional force that tries to regulate the rotation of the rotary braking body 13 is generated on the sliding surface P. When the retracted amount of the rod 5 increases, the coil spring 14 is compressed and the elastic force increases, so that the frictional force increases as the rod 5 retracts.
【００２５】而して、無端ベルトＢの張力の増加により
ロッド５が後退方向に摺動するとき、その後退量の増加
に伴って摺動面Ｐに作用する摩擦力が増加するため、回
転制動体１３の回転（即ち、ロッド５の後退）が規制さ
れる。その結果、図４に実線ｂで示すように、前記破線
ａに比べてロッド５の後退時の荷重は増加する。When the rod 5 slides in the backward direction due to the increase in the tension of the endless belt B, the frictional force acting on the sliding surface P increases as the amount of the backward movement increases. The rotation of the body 13 (that is, the backward movement of the rod 5) is restricted. As a result, as indicated by the solid line b in FIG. 4, the load when the rod 5 retracts increases as compared with the broken line a.
【００２６】また、ロッド５が前進方向に摺動すると、
回転制動体１３はロッド５のネジ部１２との螺合により
前述とは逆方向に強制的に回転駆動される。このとき、
前進するロッド５に引かれて回転制動体１３には固定制
動体１５から離反するような力が加わるが、その力より
もコイルスプリング１４が回転制動体１３を固定制動体
１５に押し付ける力の方が勝っているため、回転制動体
１３は固定制動体１５に所定の面圧で摺接し、摺動面Ｐ
には回転制動体１３の回転を規制しようとする摩擦力が
発生する。その結果、コイルスプリング１４の弾発力で
ロッド５が前進しようとする荷重は、前記摩擦力により
相殺され、図４に実線ｃで示すように、ロッド５の前進
時の荷重は前記破線ａに比べて小さくなる。When the rod 5 slides in the forward direction,
The rotation braking body 13 is forcibly driven to rotate in the opposite direction to the above by screwing with the screw portion 12 of the rod 5. At this time,
A force that is pulled by the advancing rod 5 is applied to the rotary braking body 13 so as to separate from the fixed braking body 15, but the force by which the coil spring 14 presses the rotary braking body 13 against the fixed braking body 15 is stronger than the force. Therefore, the rotary braking body 13 slidably contacts the fixed braking body 15 with a predetermined surface pressure, and the sliding surface P
A frictional force that tries to regulate the rotation of the rotary braking body 13 is generated. As a result, the load that the rod 5 tries to move forward due to the elastic force of the coil spring 14 is canceled by the frictional force, and the load when the rod 5 moves forward is shown by the broken line a as shown by the solid line c in FIG. It becomes smaller than.
【００２７】このようにして、制動手段Ｆによりロッド
５の進退時の荷重にヒステリシスを与えることができる
ので、無端ベルトＢの張力が減少した場合にはロッド５
を速やかに前進させて無端ベルトＢの弛みを抑えるとと
もに、無端ベルトＢの張力が増加した場合にはロッド５
の後退に所定の抵抗力を与えて無端ベルトＢの振動を抑
えることが可能になる。In this way, since the braking means F can give a hysteresis to the load when the rod 5 advances and retracts, when the tension of the endless belt B is reduced,
Is rapidly advanced to suppress the slack of the endless belt B, and when the tension of the endless belt B increases, the rod 5
It is possible to suppress the vibration of the endless belt B by giving a predetermined resistance force to the backward movement of.
【００２８】しかも、このオートテンショナーＴはロッ
ド５が回転せずに進退するため、ロッド５に対するプー
リ１０の支持構造が極めて簡単であるばかりか、油圧を
使用していないので、作動油の漏れを考慮することなく
任意の取付姿勢をとることができる。更に、ハウジング
４は周壁１及び一対の端壁２，３で囲まれた概略円筒状
に形成されているので、その内部に水や塵が入り難くな
っている。従って、錆の発生等によるオートテンショナ
ーＴの作動不良を効果的に防止することができる。Moreover, in this auto tensioner T, since the rod 5 advances and retreats without rotating, the supporting structure of the pulley 10 with respect to the rod 5 is extremely simple, and since hydraulic pressure is not used, there is no leakage of hydraulic oil. Any mounting posture can be taken without consideration. Further, since the housing 4 is formed in a substantially cylindrical shape surrounded by the peripheral wall 1 and the pair of end walls 2 and 3, it is difficult for water and dust to enter the inside thereof. Therefore, it is possible to effectively prevent the malfunction of the automatic tensioner T due to the generation of rust or the like.
【００２９】次に、図５に基づいて本発明の第２実施例
を説明する。Next, a second embodiment of the present invention will be described with reference to FIG.
【００３０】第２実施例は、回転制動体１３と固定制動
体１５との摺動面Ｐが平面でなく、相互に回転自在に嵌
合する曲面から構成されている。従って、回転制動体１
３が回転する際に、その回転軸線のずれを規制してロッ
ド５のコジリを防止するとともに、摺動面Ｐにおける摩
擦力の発生を安定させることができる。In the second embodiment, the sliding surface P between the rotary braking body 13 and the fixed braking body 15 is not a flat surface but is a curved surface which is rotatably fitted to each other. Therefore, the rotary braking body 1
When the shaft 3 rotates, it is possible to prevent the rod 5 from being twisted by regulating the deviation of the rotation axis thereof and to stabilize the generation of the frictional force on the sliding surface P.
【００３１】次に、図６に基づいて本発明の第３実施例
を説明する。Next, a third embodiment of the present invention will be described with reference to FIG.
【００３２】第３実施例は、固定制動体１５をハウジン
グ４の側壁１内周面にフランジ状に一体成形したもの
で、これにより部品点数の削減と小型化とが可能にな
る。In the third embodiment, the fixed braking body 15 is integrally formed on the inner peripheral surface of the side wall 1 of the housing 4 in the shape of a flange. This makes it possible to reduce the number of parts and downsize.
【００３３】次に、図７に基づいて本発明の第４実施例
を説明する。Next, a fourth embodiment of the present invention will be described with reference to FIG.
【００３４】第４実施例は、回転制動体１３が有底円筒
状に形成されており、その上底部に形成したネジ孔１３
1 にロッド５のネジ部１２が螺合している。そして回転
制動体１３の下端が、固定制動体１５として機能するハ
ウジング４の端壁３に摺接する。この第４実施例によれ
ば、部品点数を更に減少させることができる。In the fourth embodiment, the rotary braking body 13 is formed in a cylindrical shape with a bottom, and the screw hole 13 formed in the upper bottom portion thereof.
The threaded portion 12 of the rod 5 is screwed onto the screw 1 . The lower end of the rotary braking body 13 is brought into sliding contact with the end wall 3 of the housing 4 functioning as the fixed braking body 15. According to the fourth embodiment, the number of parts can be further reduced.
【００３５】次に、図８に基づいて本発明の第５実施例
を説明する。Next, a fifth embodiment of the present invention will be described with reference to FIG.
【００３６】第５実施例はロッド５のネジ部１２の構造
に特徴を有するもので、そのネジ部１２のピッチがフラ
ンジ部１１に近い側で小さく、フランジ部１１から遠い
側で大きくなるように変化している。ロッド５が後退す
るとき、その初期には大きなピッチにより回転制動体１
３の回転量が小さくなって小さな制動力が発生するが、
その後期には小さなピッチにより回転制動体１３の回転
量が大きくなって大きな制動力が発生する。従って、ネ
ジ部１２のピッチを軸方向に変化させることにより、ヒ
ステリシスの特性を任意に設定することが可能となる。The fifth embodiment is characterized by the structure of the threaded portion 12 of the rod 5. The pitch of the threaded portion 12 is small on the side close to the flange 11 and large on the side far from the flange 11. Is changing. When the rod 5 retreats, the rotary brake 1 is initially moved by a large pitch.
Although the rotation amount of 3 becomes small and a small braking force is generated,
In the latter period, the rotation amount of the rotary braking body 13 increases due to the small pitch, and a large braking force is generated. Therefore, by changing the pitch of the screw portion 12 in the axial direction, it becomes possible to arbitrarily set the hysteresis characteristic.
【００３７】次に、図９に基づいて本発明の第６実施例
を説明する。Next, a sixth embodiment of the present invention will be described with reference to FIG.
【００３８】第６実施例は、ロッド５のフランジ部１１
にコイルスプリング１４の上端を係止する代わりに、ロ
ッド５に形成した弾性部材受け部としての孔５1 にコイ
ルスプリング１４の上端を係止したものである。この実
施例によれば、ロッド５の構造を更に簡略化することが
できる。In the sixth embodiment, the flange portion 11 of the rod 5 is used.
Instead of locking the upper end of the coil spring 14, the upper end of the coil spring 14 is locked in a hole 5 1 formed in the rod 5 as an elastic member receiving portion. According to this embodiment, the structure of the rod 5 can be further simplified.
【００３９】以上、本発明の実施例を詳述したが、本発
明は前記実施例に限定されるものでなく、種々の設計変
更を行うことが可能である。Although the embodiments of the present invention have been described in detail above, the present invention is not limited to the above-mentioned embodiments, and various design changes can be made.
【００４０】例えば、実施例では回転制動体１３を合成
樹脂製とし、固定制動体１５を金属製としているが、そ
れらの材質は任意に設定することができる。またロッド
５のガイド部６の断面形状及びネジ部１２の断面形状も
任意に設定することができる。また実施例では便宜上ハ
ウジング４を一部材として図示しているが、組み立て上
の都合から適宜分割することができる。また無端伝動帯
を無端チェーンとすることもでき、この場合押圧部材は
スプロケットになる。更にまた、押圧部材は無端伝動帯
に摺接するスリッパであっても良い。For example, in the embodiment, the rotary braking body 13 is made of synthetic resin and the fixed braking body 15 is made of metal, but the materials thereof can be set arbitrarily. Further, the cross-sectional shape of the guide portion 6 of the rod 5 and the cross-sectional shape of the screw portion 12 can be arbitrarily set. Further, in the embodiment, the housing 4 is shown as one member for convenience, but it can be appropriately divided for convenience of assembly. Further, the endless transmission belt may be an endless chain, in which case the pressing member is a sprocket. Furthermore, the pressing member may be a slipper that is in sliding contact with the endless transmission belt.
【００４１】[0041]
【発明の効果】以上のように、請求項１に記載された発
明によれば、制動手段はロッドに形成したネジ部に螺合
して該ロッドの進退により回転する回転制動体と、ハウ
ジングに固設されて回転制動体に摺接する固定制動体と
を備えてなり、弾発部材はロッドに設けた弾発部材受け
部と回転制動体との間に配置されて該回転制動体を固定
制動体に圧接する方向に付勢するので、ロッドが後退す
る際の荷重は弾発部材の弾発力と両制動体間に作用する
摩擦力との和になり、ロッドが前進する際の荷重は弾発
部材の弾発力と両制動体間に作用する摩擦力との差にな
る。その結果、回転体を支持するロッドが進退する際の
荷重に所定のヒステリシスを与えて、無端伝動帯の張力
を適切に調節することができる。しかも、ロッドが回転
しないので該ロッドに回転体を支持する構造が簡略化さ
れるばかりか、油圧を使用していないので取付姿勢に制
約を受けることも無い。更に、ハウジングは周壁及び一
対の端壁を有する概略円筒状に形成されているので内部
に水や塵が入り難く、錆の発生等による作動不良を効果
的に防止することができる。As described above, according to the invention described in claim 1, the braking means is provided on the housing and the rotary braking body which is screwed into the threaded portion formed on the rod and is rotated by advancing and retracting the rod. A fixed braking body which is fixed and slidably contacts the rotary braking body, and the elastic member is disposed between the elastic member receiving portion provided on the rod and the rotary braking body, and the rotary braking body is fixedly braked. Since it is urged in the direction of pressing against the body, the load when the rod retracts is the sum of the elastic force of the elastic member and the frictional force acting between both braking bodies, and the load when the rod advances is It is the difference between the elastic force of the elastic member and the frictional force acting between the two braking bodies. As a result, a predetermined hysteresis can be given to the load when the rod that supports the rotating body advances and retracts, and the tension of the endless transmission band can be appropriately adjusted. Moreover, since the rod does not rotate, the structure for supporting the rotating body on the rod is simplified, and since hydraulic pressure is not used, the mounting posture is not restricted. Furthermore, since the housing is formed in a substantially cylindrical shape having a peripheral wall and a pair of end walls, it is difficult for water and dust to enter the inside, and it is possible to effectively prevent malfunctions due to rust and the like.
【００４２】また請求項２に記載された発明によれば、
固定制動体はロッドの他端部が遊嵌する円筒状の部材で
あって、その一端部においてハウジングの他方の端壁に
固定されるとともに、その他端部において回転制動体に
摺接するので、ロッドのネジ部と干渉することなく回転
制動体を固定制動体に摺接させることができる。According to the second aspect of the present invention,
The fixed braking body is a cylindrical member into which the other end of the rod is loosely fitted. One end of the stationary braking body is fixed to the other end wall of the housing, and the other end of the fixed braking body slidably contacts the rotary braking body. The rotary braking body can be brought into sliding contact with the fixed braking body without interfering with the screw portion of the.
【００４３】また請求項３に記載された発明によれば、
固定制動体はハウジングの周壁内面から一体に張り出し
てロッドの他方の端部が遊嵌するフランジ状の部材であ
るため、部品点数を削減することができる。According to the third aspect of the present invention,
Since the fixed braking body is a flange-shaped member that integrally projects from the inner surface of the peripheral wall of the housing and the other end of the rod is loosely fitted, the number of parts can be reduced.
【００４４】また請求項４に記載された発明によれば、
回転制動体は有底円筒状の部材であって、その底部にロ
ッドのネジ部が螺合するとともに、その開口部がハウジ
ングの他方の端壁に設けた固定制動体に摺接するので、
部品点数を更に削減することができる。According to the invention described in claim 4,
The rotary braking body is a cylindrical member with a bottom, and the threaded portion of the rod is screwed into the bottom portion thereof, and its opening is slidably contacted with the fixed braking body provided on the other end wall of the housing.
The number of parts can be further reduced.
【００４５】また請求項５に記載された発明によれば、
ロッドは非円形断面のガイド部を有しており、このガイ
ド部をハウジングの一方の端壁に形成した非円形断面の
ガイド孔に挿通したので、簡単な構造でロッドを摺動可
能且つ回転不能に支持することができる。According to the invention described in claim 5,
The rod has a guide part with a non-circular cross section, and this guide part is inserted into a guide hole with a non-circular cross section formed in one end wall of the housing, so the rod can be slid and non-rotatable with a simple structure. Can be supported by.
【００４６】また請求項６に記載された発明によれば、
ロッドのネジ部のピッチを軸方向に変化させたので、ロ
ッドの変位に対する回転制動体の回転数を変化させて前
記ヒステリシスを任意に設定することができる。According to the invention described in claim 6,
Since the pitch of the threaded portion of the rod is changed in the axial direction, the hysteresis can be arbitrarily set by changing the rotation speed of the rotary braking body with respect to the displacement of the rod.
【００４７】また請求項７に記載された発明によれば、
回転制動体及び固定制動体の摺接面を非平面として両制
動体を相互に嵌合させたので、回転制動体の回転軸のず
れを防止して安定した摩擦力を得ることができる。According to the seventh aspect of the present invention,
Since the sliding contact surfaces of the rotary braking body and the fixed braking body are made non-planar and the two braking bodies are fitted to each other, it is possible to prevent the rotation axis of the rotary braking body from shifting and obtain a stable frictional force.
【図１】オートテンショナーの全体側面図[Figure 1] Overall side view of the auto tensioner
【図２】図１の２−２線断面図FIG. 2 is a sectional view taken along line 2-2 of FIG.
【図３】図１の３−３線断面図FIG. 3 is a sectional view taken along line 3-3 of FIG.
【図４】ロッドの変位と荷重との関係を示すグラフFIG. 4 is a graph showing the relationship between rod displacement and load.
【図５】第２実施例に係る、前記図１に対応する図FIG. 5 is a view corresponding to FIG. 1 according to the second embodiment.
【図６】第３実施例に係る、前記図１に対応する図FIG. 6 is a view corresponding to FIG. 1 according to a third embodiment.
【図７】第４実施例に係る、前記図１に対応する図FIG. 7 is a diagram corresponding to FIG. 1 according to a fourth embodiment.
【図８】第５実施例に係る、ロッドの側面図FIG. 8 is a side view of the rod according to the fifth embodiment.
【図９】第６実施例に係る、ロッド及びコイルスプリン
グの側面図FIG. 9 is a side view of a rod and a coil spring according to a sixth embodiment.
１ 周壁 ２ 端壁 ２1 ガイド孔 ３ 端壁 ４ ハウジング ５ ロッド ５1 孔（弾発部材受け部） ６ ガイド部 １０ プーリ（押圧部材） １１ フランジ部（弾発部材受け部） １２ ネジ部 １３ 回転制動体 １４ コイルスプリング（弾発部材） １５ 固定制動体 Ｂ 無端ベルト（無端伝動帯） Ｆ 制動手段 Ｐ 摺動面1 peripheral wall 2 end wall 2 1 guide hole 3 end wall 4 housing 5 rod 5 1 hole (elastic member receiving part) 6 guide part 10 pulley (pressing member) 11 flange part (elastic member receiving part) 12 screw part 13 rotation Braking body 14 Coil spring (elastic member) 15 Fixed braking body B Endless belt (endless transmission belt) F Braking means P Sliding surface
Claims (7)
有する概略筒状のハウジング（４）と、 ハウジング（４）に該ハウジング（４）の軸線に沿って
進退可能且つ回転不能に支持されたロッド（５）と、 ハウジング（４）の内部に収納されて該ハウジング
（４）の一方の端壁（２）からロッド（５）を前進させ
る方向に付勢する弾発部材（１４）と、 ハウジング（４）の一方の端壁（２）から延出するロッ
ド（５）の一端部に支持されて無端伝動帯（Ｂ）に弾発
的に当接する押圧部材（１０）と、 ハウジング（４）
の内部に収納されてロッド（５）が前進するときの荷重
及び後退するときの荷重間にヒステリシスを与える制動
手段（Ｆ）と、を備えたオートテンショナーであって、 前記制動手段（Ｆ）はロッド（５）に形成したネジ部
（１２）に螺合して該ロッド（５）の進退により回転す
る回転制動体（１３）と、ハウジング（４）に固設され
て回転制動体（１３）に摺接する固定制動体（１５）と
を備えてなり、前記弾発部材（１４）はロッド（５）に
設けた弾発部材受け部（５1 ，１１）と回転制動体（１
３）との間に配置されて該回転制動体（１３）を固定制
動体（１５）に圧接する方向に付勢することを特徴とす
るオートテンショナー。1. A substantially cylindrical housing (4) having a peripheral wall (1) and a pair of end walls (2, 3), and a housing (4) capable of advancing and retracting and rotating along the axis of the housing (4). An unsupported rod (5) and an elastic member housed inside the housing (4) for urging the rod (5) forward from one end wall (2) of the housing (4). (14) and a pressing member (10) which is supported by one end of a rod (5) extending from one end wall (2) of the housing (4) and elastically contacts the endless transmission band (B). And housing (4)
An automatic tensioner that is housed inside the vehicle and provides a hysteresis between the load when the rod (5) moves forward and the load when the rod (5) moves backward, and the braking means (F) is A rotation braking body (13) that is screwed into a threaded portion (12) formed on the rod (5) and rotates by advancing and retracting the rod (5), and a rotation braking body (13) fixed to the housing (4). And a fixed braking body (15) slidably contacting with the elastic member. The elastic member (14) includes elastic member receiving portions (5 1 , 11) provided on the rod (5) and a rotary braking member (1).
An automatic tensioner which is arranged between the rotating tension body (3) and the fixed braking body (15) so as to urge the rotation braking body (13) in a direction of being pressed against the fixed braking body (15).
端部が遊嵌する円筒状の部材であって、その一端部にお
いてハウジング（４）の他方の端壁（３）に固定される
とともに、その他端部において回転制動体（１３）に摺
接することを特徴とする、請求項１記載のオートテンシ
ョナー。2. The fixed braking body (15) is a cylindrical member in which the other end of the rod (5) is loosely fitted, and is fixed to the other end wall (3) of the housing (4) at one end thereof. The automatic tensioner according to claim 1, wherein the automatic tensioner slidably contacts the rotary braking body (13) at the other end.
の周壁（１）内面から一体に張り出してロッド（５）の
他端部が遊嵌するフランジ状の部材であることを特徴と
する、請求項１記載のオートテンショナー。3. The fixed braking body (15) is a housing (4).
The auto tensioner according to claim 1, wherein the auto tensioner is a flange-shaped member that integrally projects from the inner surface of the peripheral wall (1) of the rod and the other end of the rod (5) is loosely fitted.
であって、その底部にロッド（５）のネジ部（１２）が
螺合するとともに、その開口部がハウジング（４）の他
方の端壁（３）に設けた固定制動体（１５）に摺接する
ことを特徴とする、請求項１記載のオートテンショナ
ー。4. The rotary braking body (13) is a cylindrical member having a bottom, and the threaded portion (12) of the rod (5) is screwed into the bottom portion of the rotation braking body (13) and the opening portion of the housing (4). The automatic tensioner according to claim 1, which is in sliding contact with a fixed braking body (15) provided on the other end wall (3).
（６）を有しており、このガイド部（６）をハウジング
（４）の一方の端壁（２）に形成した非円形断面のガイ
ド孔（２1 ）に挿通したことを特徴とする、請求項１記
載のオートテンショナー。5. The rod (5) has a guide portion (6) having a non-circular cross section, and the guide portion (6) is formed on one end wall (2) of the housing (4). the guide hole, characterized in that inserted into (2 1), according to claim 1, wherein the auto-tensioner.
を軸方向に変化させたことを特徴とする、請求項１記載
のオートテンショナー。6. The auto tensioner according to claim 1, wherein the pitch of the threaded portion (12) of the rod (5) is changed in the axial direction.
５）の摺動面（Ｐ）を非平面として両制動体（１３，１
５）を相互に嵌合させたことを特徴とする、請求項１記
載のオートテンショナー。7. A rotary braking body (13) and a fixed braking body (1)
The sliding surface (P) of 5) is made non-planar, and both braking bodies (13, 1)
The autotensioner according to claim 1, wherein 5) are fitted to each other.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP21789995A JP3554413B2 (en) | 1995-08-25 | 1995-08-25 | Auto tensioner |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP21789995A JP3554413B2 (en) | 1995-08-25 | 1995-08-25 | Auto tensioner |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0960697A true JPH0960697A (en) | 1997-03-04 |
| JP3554413B2 JP3554413B2 (en) | 2004-08-18 |
Family
ID=16711507
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP21789995A Expired - Fee Related JP3554413B2 (en) | 1995-08-25 | 1995-08-25 | Auto tensioner |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3554413B2 (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR101159258B1 (en) * | 2008-12-24 | 2012-06-26 | 주식회사 신라정밀 | Regulating device of tension |
| CN103216591A (en) * | 2013-03-30 | 2013-07-24 | 齐玉民 | Triangle belt driving device for increasing friction force of driving belt wheel |
-
1995
- 1995-08-25 JP JP21789995A patent/JP3554413B2/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR101159258B1 (en) * | 2008-12-24 | 2012-06-26 | 주식회사 신라정밀 | Regulating device of tension |
| CN103216591A (en) * | 2013-03-30 | 2013-07-24 | 齐玉民 | Triangle belt driving device for increasing friction force of driving belt wheel |
Also Published As
| Publication number | Publication date |
|---|---|
| JP3554413B2 (en) | 2004-08-18 |
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