JP2547809B2 - Belt transmission device with automatic tension adjustment mechanism - Google Patents
Belt transmission device with automatic tension adjustment mechanismInfo
- Publication number
- JP2547809B2 JP2547809B2 JP63026873A JP2687388A JP2547809B2 JP 2547809 B2 JP2547809 B2 JP 2547809B2 JP 63026873 A JP63026873 A JP 63026873A JP 2687388 A JP2687388 A JP 2687388A JP 2547809 B2 JP2547809 B2 JP 2547809B2
- Authority
- JP
- Japan
- Prior art keywords
- pulley
- pulley member
- links
- timing belt
- outer periphery
- 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 - Lifetime
Links
Landscapes
- Devices For Conveying Motion By Means Of Endless Flexible Members (AREA)
Description
【発明の詳細な説明】 (産業上の利用分野) 本発明は、ベルトの張力を駆動力に応じて自動的に調
整して、そのスキップ現象を抑制するベルト伝動装置の
改良に関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an improvement in a belt transmission device that automatically adjusts the tension of a belt according to a driving force to suppress the skip phenomenon.
(従来の技術) 従来より、歯付プーリにタイミングベルト(シンクロ
ベルト)を巻き掛けてベルト伝動を行うベルト伝動装置
においては、ベルトの張力が低下すると、ベルトの歯部
とプーリの歯部との噛合がなくなっていわゆるスキップ
現象が生じるという問題がある。(Prior Art) Conventionally, in a belt transmission device in which a timing belt (synchro belt) is wound around a toothed pulley to perform belt transmission, when the tension of the belt decreases, the tooth portion of the belt and the tooth portion of the pulley are separated from each other. There is a problem that the mesh is lost and a so-called skip phenomenon occurs.
斯かるスキップ現象を抑制する装置としては、ベルト
の緩み側背面をばね等に付勢されたテンションローラに
より押圧して、ベルトにその駆動力に応じた張力を与え
るテンション機構が知られているが、このものでは、ベ
ルトがテンションローラによって通常の屈曲方向とは逆
の背面方向に屈曲されるため、ベルト心体の疲労が促進
され、ベルトの耐久性が低下するという不具合があっ
た。また、大きいトルクが加わった場合や、経時変化に
伴ってベルトに伸びが生じた場合には、テンションロー
ラのばね等の戻りによりその押圧力が低下し、やはりス
キップ現象の発生は確実に阻止し得ない。As a device for suppressing such a skip phenomenon, a tension mechanism is known in which the back surface on the loose side of the belt is pressed by a tension roller urged by a spring or the like to apply tension to the belt in accordance with its driving force. In this case, since the belt is bent in the back direction opposite to the normal bending direction by the tension roller, fatigue of the belt core body is promoted and the durability of the belt is deteriorated. In addition, when a large torque is applied or when the belt stretches due to aging, the spring force of the tension roller returns and its pressing force decreases, and the occurrence of the skip phenomenon is surely prevented. I don't get it.
そこで、上記の不具合を解消すべく、従来、特公昭58
−47592号公報に開示される自動張力調整機構を備えた
ベルト伝動装置が提案されている。Therefore, in order to eliminate the above-mentioned problems, the conventional Japanese Patent Publication 58
A belt transmission device provided with an automatic tension adjusting mechanism disclosed in Japanese Patent Laid-Open No. 47592 has been proposed.
すなわち、この提案のものは、例えば第5図に示すよ
うに、互いに平行な1対の回転軸a,bと、該回転軸a,bに
それぞれ支持された歯付プーリからなる駆動および従動
プーリc,dと、該両プーリc,d間に巻き掛けられて両回転
軸間a,bで動力を伝達するタイミングベルトeとを設
け、上記駆動または従動プーリc,dのいずれか一方を、
回転軸a,bに回転一体に支持されかつ外周にギヤfを有
する第1プーリ部材gと、該第1プーリ部材gの外周に
第1プーリ部材gの軸心a1に対して偏心可能に配置さ
れ、上記第1プーリ部材gのギヤfに噛合するギヤhを
内周に有するとともに、外周に上記タイミングベルトe
に噛み合う歯部iを有する第2プーリ部材jとで構成
し、上記両回転軸a,bの軸心a1,b1同士を結ぶ直線lAと、
該直線lAに直交しかつ上記第1プーリ部材gの軸心a1を
通る直線lBとにより区画された緩み側偏心ゾーンZに、
上記第2プーリ部材iの軸心i1が所定量偏心して位置す
るよう、上記ベルトeの長さを設定したものである。That is, as shown in FIG. 5, for example, this proposed drive and driven pulley comprises a pair of rotating shafts a and b parallel to each other and toothed pulleys supported by the rotating shafts a and b, respectively. c and d, and a timing belt e that is wound between the two pulleys c and d and transmits the power between the two rotation shafts a and b, and one of the drive or driven pulleys c and d is
A first pulley member g, which is rotatably supported integrally with the rotating shafts a and b and has a gear f on the outer circumference, and an eccentricity with respect to the axis a 1 of the first pulley member g on the outer circumference of the first pulley member g The gear h, which is arranged and meshes with the gear f of the first pulley member g, is provided on the inner circumference and the timing belt e is provided on the outer circumference.
A second pulley member j having a tooth portion i that meshes with a straight line l A connecting the shaft centers a 1 and b 1 of the rotating shafts a and b,
In a slack side eccentric zone Z defined by a straight line l B orthogonal to the straight line l A and passing through the axis a 1 of the first pulley member g,
The length of the belt e is set so that the axial center i 1 of the second pulley member i is located eccentrically by a predetermined amount.
(発明が解決しようとする課題) しかしながら、この提案のものでは、図示の如く、駆
動プーリc側を第1および第2プーリ部材g,iで構成し
た場合、該両プーリ部材g,iの径の違いにより必然的に
第2プーリ部材i側のギヤhの数が第1プーリ部材gの
ギヤfの数よりも多くなり、回転軸aの回転が減速され
て第2プーリ部材iつまりベルトeに伝達されることと
なる。このため、駆動プーリcから従動ブーリdに回転
を増速して伝達する必要のある自転車の駆動系に適用す
ると、その増速伝達の確保のために、上記減速分を見越
して駆動プーリcの直径を必要以上に大きくせねばなら
ず、その配置スペースが大きくなったり、重量が増加し
たりする等の難がある。(Problems to be Solved by the Invention) However, in this proposal, when the drive pulley c side is constituted by the first and second pulley members g, i as shown in the drawing, the diameters of the pulley members g, i Inevitably, the number of gears h on the second pulley member i side becomes larger than the number of gears f of the first pulley member g, and the rotation of the rotation shaft a is decelerated, so that the second pulley member i, that is, the belt e. Will be transmitted to. Therefore, when the invention is applied to a drive system of a bicycle in which it is necessary to accelerate and transmit the rotation from the drive pulley c to the driven pulley d, in order to ensure the speed-up transmission, the drive pulley c should be kept in anticipation of the deceleration. The diameter must be made larger than necessary, and there are problems such as a large space for disposing it and an increase in weight.
また、両プーリ部材g,iは剛体同士の噛合いとなるた
め、その駆動伝達の際の摩擦トルクロスや騒音が大き
く、さらには磨耗による耐久性の点でも問題がある。し
かも、ギヤf,h部分に異物が混入したときには、プーリ
の損傷が生じる虞れもあった。Further, since the two pulley members g and i are in mesh with each other between rigid bodies, there is a large amount of friction torque and noise during drive transmission, and there is a problem in durability due to wear. Moreover, when foreign matter enters the gears f and h, the pulley may be damaged.
本発明は斯かる諸点に鑑みてなされたものであり、そ
の目的は、上記のベルト伝動装置において、回転軸に結
合支持される第1プーリ部材とベルトに噛合連結される
第2プーリ部材とをギヤ機構以外の手段により連結する
ようにすることにより、第1プーリ部材の回転を減速す
ることなくそのまま、かつ摩擦トルクロスや騒音を低減
して第2プーリ部材に伝達でき、しかも異物の混入の悪
影響を排除できるようにし、駆動側のプーリの回転を増
速して従動側のプーリに伝達する駆動系であっても該駆
動側のプーリの直径を小さく保って、その配置スペース
の縮小化および軽量化を図ることにある。The present invention has been made in view of the above points, and an object thereof is to provide, in the above belt transmission, a first pulley member that is coupled and supported by a rotating shaft and a second pulley member that is meshed and coupled with a belt. By connecting by means other than the gear mechanism, the rotation of the first pulley member can be transmitted to the second pulley member without decelerating the rotation as it is and the friction torque and noise can be transmitted to the second pulley member. The diameter of the driving pulley can be kept small to reduce the installation space and reduce the weight even in a drive system that accelerates the rotation of the driving pulley and transmits it to the driven pulley. It is to try to realize.
(課題を解決するための手段) この目的を達成するために、本発明の解決手段は、基
本的に、駆動側のプーリにおける第1および第2プーリ
部材をリンク機構によって連結する。(Means for Solving the Problem) In order to achieve this object, the solution means of the present invention basically connects the first and second pulley members of the driving pulley by a link mechanism.
すなわち、本発明は、互いに平行な1対の回転軸と、
該回転軸にそれぞれ支持された歯付プーリからなる駆動
および従動プーリと、該両プーリ間に巻き掛けられて両
回転軸間で動力を伝達するタイミングベルトとを備えた
ベルト伝動装置が前提である。That is, the present invention includes a pair of rotation axes parallel to each other,
It is premised on a belt transmission device including drive and driven pulleys, which are toothed pulleys respectively supported on the rotary shaft, and a timing belt which is wound between the pulleys and which transmits power between the rotary shafts. .
上記駆動プーリの具体構造として、回転軸に回転一体
に支持された第1プーリ部材と、該第1プーリ部材の外
周に第1プーリ部材の軸心に対して偏心可能に配置さ
れ、外周に上記タイミングベルトに噛み合う歯部を有す
る第2プーリ部材とで構成し、その両プーリ部材をリン
ク機構で連結する。このリンク機構は、一端が上記第1
プーリ部材の外周に所定角度間隔をあけてかつ回転軸と
直交する面内で揺動可能に支持された複数の第1リンク
と、一端が該各第1リンクの他端に揺動可能に連結さ
れ、他端が上記第2プーリ部材の円周に所定角度間隔を
あけてかつ回転軸と直交する面内で揺動可能に支持され
た複数の第2リンクとで構成する。As a specific structure of the drive pulley, a first pulley member rotatably and integrally supported by a rotating shaft, an outer periphery of the first pulley member, the first pulley member being eccentrically arranged with respect to the axis of the first pulley member, A second pulley member having a tooth portion that meshes with the timing belt, and both pulley members are connected by a link mechanism. This link mechanism has one end with the first
A plurality of first links that are swingably supported on the outer periphery of the pulley member at predetermined angular intervals and in a plane orthogonal to the rotation axis, and one end is swingably connected to the other end of each first link. The other end is constituted by a plurality of second links supported at a predetermined angular interval on the circumference of the second pulley member and swingably in a plane orthogonal to the rotation axis.
具体的には、上記リンク機構における第1および第2
の各リンクは、第1プーリ部材の駆動力の増大に伴い、
両リンク間の連結角度が変化して、第1および第2プー
リ部材の軸心を通る平面において両回転軸の軸心同士を
結ぶ直線に対しほぼタイミングベルトの緊張側を横切る
ときに重なるように、あるいは同様に両プーリ部材の軸
心を通る平面において両回転軸の軸心同士を結ぶ直線に
対しほぼタイミングベルトの緩み側を横切るときに同一
直線に沿って伸びるように設定する。Specifically, the first and second link mechanisms
Each of the links, with the increase of the driving force of the first pulley member,
The connecting angle between both links changes so that they overlap each other when they cross the tension side of the timing belt with respect to the straight line connecting the axes of the rotating shafts in the plane passing through the axes of the first and second pulley members. Or, similarly, it is set so as to extend along the same straight line when it traverses the loose side of the timing belt with respect to the straight line connecting the shaft centers of both the rotary shafts in the plane passing through the shaft centers of the pulley members.
(作用) 上記の構成により、本発明では、無負荷状態ではタイ
ミングベルトの張力が零になり、駆動プーリの第1およ
び第2プーリ部材の軸心が最大量偏位する。この状態か
ら回転軸に駆動力が加わって負荷状態になると、その駆
動力に応じて上記各プーリとリンクとの位置関係が連続
的に変化し、第1および第2のリンクが第1および第2
プーリ部材の軸心を通る平面を横切るときに、両リンク
が重なりまたは同一直線上に延びて、第1プーリ部材か
ら該両リンクを介して第2プーリ部材に駆動力が伝達さ
れる。このとき、両リンクに伝わる力の分力として、駆
動力と共に第2プーリ部材を第1および第2プーリ部材
の軸心を通る平面に沿ってタイミングベルトの緊張側に
移動させようとする力が働き、この力により両プーリ部
材の偏心量が減少方向に変化して、第2プーリ部材がベ
ルトピッチ周長を増大させる方向に移動し、これに伴っ
てベルトの張り側と緩み側とに常に一定の比率で張力が
分配され、よってベルトのスキップ現象を有効に抑制で
きることとなる。そして、ベルトの回行状態では、両プ
ーリ部材の軸心が略一致し、このことにより駆動プーリ
はスムーズに回転する。(Operation) With the above configuration, in the present invention, the tension of the timing belt becomes zero in the unloaded state, and the axial centers of the first and second pulley members of the drive pulley deviate by the maximum amount. When a driving force is applied to the rotary shaft from this state and a load is applied, the positional relationship between the pulleys and the links changes continuously according to the driving force, and the first and second links move to the first and second links. Two
When traversing a plane passing through the axis of the pulley member, both links overlap or extend on the same straight line, and the driving force is transmitted from the first pulley member to the second pulley member via the both links. At this time, as a component force of the force transmitted to both links, a force for moving the second pulley member to the tension side of the timing belt along a plane passing through the axial centers of the first and second pulley members together with the driving force is generated. By this force, the eccentric amount of both pulley members changes in the decreasing direction, the second pulley member moves in the direction of increasing the belt pitch circumferential length, and along with this, the belt is always tensioned and loosened. The tension is distributed at a constant ratio, so that the belt skip phenomenon can be effectively suppressed. Then, when the belt is running, the shaft centers of the two pulley members substantially coincide with each other, which causes the drive pulley to rotate smoothly.
上記第1および第2リンクが、第1および第2プーリ
部材の軸心を通る平面を横切るときに、第1プーリ部材
から両リンクを介して第2プーリ部材に駆動力が伝達さ
れるが、その場合、両リンクを、第1および第2プーリ
部材の軸心を通る平面において両回転軸の軸心同士を結
ぶ直線に対しほぼベルト緊張側を横切る際に重なるよう
に設定すると、第2プーリ部材は両リンクにより押され
ることによってベルト緊張側に移動する特性を有する。
一方、上記直線に対しほぼベルト緩み側を横切る際に同
一直線に沿って延びるように設定すると、第2プーリ部
材は両リンクに引っ張られることによってベルト緊張側
に移動する特性を有する。したがって、これらの特性を
考慮し、必要に応じて適宜選択することが可能である。When the first and second links cross a plane passing through the axes of the first and second pulley members, the driving force is transmitted from the first pulley member to the second pulley member via both links. In that case, if both links are set so as to overlap each other when the belt tension side is crossed with respect to a straight line connecting the axes of the rotating shafts in a plane passing through the axes of the first and second pulley members, the second pulley The member has the property of moving toward the belt tension side when pushed by both links.
On the other hand, if the second pulley member is set so as to extend along the same straight line when crossing the belt loosening side with respect to the straight line, the second pulley member has a characteristic of being moved to the belt tension side by being pulled by both links. Therefore, in consideration of these characteristics, it is possible to appropriately select as necessary.
そして、この発明の場合、上記第1および第2プーリ
部材が第1および第2リンクからなるリンク機構により
連結されているので、駆動プーリに対しその回転軸の回
転を1:1の伝達比で伝達でき、駆動プーリの回転を増速
して従動プーリに伝動する場合であっても駆動プーリを
必要以上に大きくせずとも済み、よって駆動プーリの配
置スペースを縮小しかつその重量を軽減できるのであ
る。Further, in the case of the present invention, since the first and second pulley members are connected by the link mechanism including the first and second links, the rotation of the rotation shaft of the drive pulley is transmitted at a transmission ratio of 1: 1. It is possible to transmit, and even when the rotation of the drive pulley is increased to be transmitted to the driven pulley, it is not necessary to make the drive pulley larger than necessary, so that the space for arranging the drive pulley and the weight thereof can be reduced. is there.
また、こうしてリンク機構による連結により両プーリ
部材間で駆動力を伝達するため、ギヤの噛合等により駆
動力を伝達する場合と比べ、摩擦トルクロスや騒音が小
さく、しかもプーリ部材間に異物が混入したとしてもプ
ーリ部材は損傷を受け難い。Further, since the driving force is transmitted between the two pulley members by the connection by the link mechanism in this way, the friction torque and the noise are smaller than the case where the driving force is transmitted by the meshing of the gears and the foreign matter is mixed between the pulley members. However, the pulley member is not easily damaged.
(実施例) 以下、本発明の実施例を図面に基づいて説明する。(Example) Hereinafter, the Example of this invention is described based on drawing.
第1図および第2図は本発明の第1実施例を示し、1
は自転車のクランクペダル(図示せず)に連結された駆
動軸、2は該駆動軸1に平行に配置されて自転車の後車
輪(図示せず)を支持する従動軸であって、上記駆動軸
1には歯付きの駆動プーリ3が回転一体に取り付けら
れ、従動軸2には駆動プーリ3よりも小径で外周に歯部
9aを有する従動プーリ9が駆動回転方向(図で反時計回
り方向)にのみ回転一体に支持されている。そして、こ
の駆動および従動プーリ3,9間には底面(内周面)に歯
部10aを有するタイミングベルト10が巻き掛けられてお
り、このベルト10によって駆動軸1から従動軸2に動力
を伝達するようになされている。1 and 2 show a first embodiment of the present invention.
Is a drive shaft connected to a crank pedal (not shown) of the bicycle, 2 is a driven shaft which is arranged in parallel with the drive shaft 1 and supports a rear wheel (not shown) of the bicycle. A drive pulley 3 having a tooth is integrally attached to the drive shaft 1 so that the driven shaft 2 has a smaller diameter than the drive pulley 3 and a tooth portion on the outer periphery.
The driven pulley 9 having 9a is rotatably supported integrally only in the drive rotation direction (counterclockwise direction in the drawing). A timing belt 10 having a tooth portion 10a on the bottom surface (inner peripheral surface) is wound between the drive and driven pulleys 3 and 9, and the belt 10 transmits power from the drive shaft 1 to the driven shaft 2. It is designed to do.
上記駆動プーリ3は、駆動軸1に回転一体に支持され
た小径の第1プーリ部材4と、該第1プーリ部材4の外
周に配置され、第1プーリ部材4の軸心O1すなわち駆動
軸1の回転中心に対して偏心可能な軸心O2を有するリン
グ状の第2プーリ部材5と、両プーリ部材4,5を連結す
るリンク機構6とで構成され、上記第2プーリ部材5の
外周には上記タイミングベルト10に噛み合う歯部5aが形
成されている。The drive pulley 3 is disposed on the outer periphery of the first pulley member 4 having a small diameter, which is rotatably and integrally supported by the drive shaft 1, and is disposed on the outer circumference of the first pulley member 4, and the axis O 1 of the first pulley member 4, that is, the drive shaft. The ring-shaped second pulley member 5 having an axis O 2 that can be eccentric with respect to the rotation center of 1 and a link mechanism 6 that connects the pulley members 4 and 5 together. A tooth portion 5a that meshes with the timing belt 10 is formed on the outer periphery.
また、上記リンク機構6は、8本の等長の第1リンク
7,7,…と、該各第1リンク7よりも短い8本の等長の第
2リンク8,8,…とを備えてなり、上記各第1リンク7の
一端は、上記内側の第1プーリ部材4の外周において45
゜の角度間隔をあけた8等分位置にピン等の連結手段に
より上記駆動軸1と直交する面内で揺動可能に支持され
ている。この第1リンク7,7,…の各々の他端にはそれぞ
れ第2リンク8,8,…の一端がピン11,11,…により揺動可
能に連結され、該各第2リンク8の他端は、上記外側の
第2プーリ部材5の同一円周上(その位置を破線にて示
す)において45゜の角度間隔をあけた8等分位置にピン
等の連結手段により駆動軸1と直交する面内で揺動可能
に支持されている。In addition, the link mechanism 6 includes eight first links of equal length.
, And eight equal-length second links 8, 8, ... Shorter than each of the first links 7, one end of each of the first links 7 is 45 on the outer circumference of one pulley member 4
It is swingably supported in a plane orthogonal to the drive shaft 1 by connecting means such as pins at eight equally spaced positions with an angular interval of °. The other end of each of the first links 7, 7, ... Is connected to one end of a second link 8, 8 ,. The ends are orthogonal to the drive shaft 1 by a connecting means such as a pin or the like at eight equally spaced positions at an angle of 45 ° on the same circumference of the outer second pulley member 5 (the position is shown by a broken line). It is swingably supported in the plane.
そして、上記第1および第2の各リンク7,8は、第1
プーリ部材4の駆動力の増大に伴い、両リンク7,8間の
連結角度が変化し、第1および第2プーリ部材4,5の軸
心O1,O2を通る平面pにおいて駆動および従動軸1,2の軸
心O3同士を結ぶ直線lAに対し、ほぼタイミングベルト10
の緊張側範囲(図で左上側)を横切るときに重なるよう
に設定されている。The first and second links 7 and 8 are
As the driving force of the pulley member 4 increases, the connecting angle between the links 7 and 8 changes, and the driving and the following are performed on the plane p passing through the shaft centers O 1 and O 2 of the first and second pulley members 4,5. About the timing belt 10 with respect to the straight line l A that connects the axes O 3 of axes 1 and 2,
It is set to overlap when it crosses the tension side range (upper left side in the figure).
また、上記駆動および従動軸1,2の軸心O1,O3同士を結
ぶ直線lAと、該直線lAに直交しかつ上記第1プーリ部材
4の軸心O1を通る直線lBとにより区画された緩み側偏心
ゾーンZに、上記第2プーリ部材5の軸心O2が所定量偏
心して位置するよう、上記タイミングベルト10の長さが
設定されている。Further, the straight line l B passing through the straight line l A connecting axis O 1, O 3 between the drive and driven shaft 2, and perpendicular to the straight line l A and the axis O 1 of the first pulley member 4 The length of the timing belt 10 is set so that the shaft center O 2 of the second pulley member 5 is located eccentrically by a predetermined amount in the slack side eccentric zone Z defined by.
したがって、上記実施例においては、駆動および従動
プーリ3,9間で動力伝達が行われない無負荷状態では、
第1図に示すように、タイミングベルト10の張力が零に
なり、駆動プーリ3における第2プーリ部材5の軸心O2
が第1プーリ4の軸心O1に対し最大量偏心している。Therefore, in the above embodiment, in the no-load state in which power is not transmitted between the drive and driven pulleys 3 and 9,
As shown in FIG. 1, the tension of the timing belt 10 becomes zero, and the axial center O 2 of the second pulley member 5 in the drive pulley 3 is reduced.
Is eccentric to the axial center O 1 of the first pulley 4 by the maximum amount.
この状態から駆動軸1に駆動力が加わって負荷状態に
なると、第2図に示すように、その駆動力に応じて上記
第2プーリ部材5と第1および第2リンク7,8との位置
が連続的に変化し、両リンク7,8が第1および第2プー
リ部材5の軸心O1,O2を通る平面pにおいて駆動および
従動軸1,2の軸心O1,O3同士を結ぶ直線lAに対しほぼタイ
ミングベルト10の緊張側範囲(図で左上側)を横切ると
きに、両リンク7,8が重なって、第1プーリ部材4から
該両リンク7,8を介して第2プーリ部材5に駆動力が伝
達される。このとき、両リンク7,8に伝なる力の分力と
して、駆動力の他に第2プーリ部材5を第1および第2
プーリ部材4,5の軸心O1,O2を通る平面pに沿ってタイミ
ングベルト10の緊張側に移動させようとする力とが働
き、第2プーリ部材5が上記重なった両リンク7,8によ
り押されて第1プーリ部材4との偏心量が減少するよう
にベルト緊張側(ベルトピッチ周長を増大させる方向)
に移動し、これに伴ってタイミングベルト10の張り側と
緩み側とに常に一定の張力が分配される。その結果、タ
イミングベルト10のスキップ現象を抑制することができ
る。When a driving force is applied to the drive shaft 1 from this state to bring it into a loaded state, as shown in FIG. 2, the positions of the second pulley member 5 and the first and second links 7 and 8 in accordance with the driving force. There continuously changed, the axis O 1 of the drive and driven shaft 2 both links 7 and 8 in a plane p passing through the axis O 1, O 2 of the first and second pulley 5, O 3 with each other When crossing a tension side range (upper left side in the figure) of the timing belt 10 with respect to a straight line l A connecting the two, the links 7 and 8 overlap each other, and the first pulley member 4 passes through the links 7 and 8. The driving force is transmitted to the second pulley member 5. At this time, in addition to the driving force, the second pulley member 5 is used as a component of the force transmitted to both the links 7 and 8 for the first and second pulley members.
A force to move the timing belt 10 to the tension side along a plane p passing through the shaft centers O 1 and O 2 of the pulley members 4 and 5 acts, and the second pulley member 5 has the two overlapping links 7, Belt tension side so that the amount of eccentricity with the first pulley member 4 is reduced by pressing by 8 (direction to increase belt pitch circumference)
And accordingly, a constant tension is always distributed to the tension side and the slack side of the timing belt 10. As a result, the skip phenomenon of the timing belt 10 can be suppressed.
そして、タイミングベルト10の回行状態では、上記両
プーリ部材4,5の軸心O1,O2同士が略一致し、このことに
より駆動プーリ3をスムーズに回転させることができ
る。Then, when the timing belt 10 is in the traveling state, the shaft centers O 1 and O 2 of the pulley members 4 and 5 are substantially aligned with each other, whereby the drive pulley 3 can be smoothly rotated.
その場合、上記第1および第2プーリ部材4,5が第1
および第2リンク7,8からなるリンク機構6により連結
されているので、駆動プーリ3に対しその回転軸1の回
転を1:1の伝達比で伝達でき、駆動プーリ3の回転を増
速して従動プーリ9に伝動する場合であっても駆動プー
リ3を必要以上に大きくせずとも済み、よって駆動プー
リ3の配置スペースを縮小しかつその重量をも軽減する
ことができる。In that case, the first and second pulley members 4,5 are the first
Also, since it is connected by the link mechanism 6 composed of the second links 7 and 8, the rotation of the rotary shaft 1 can be transmitted to the drive pulley 3 at a transmission ratio of 1: 1 to accelerate the rotation of the drive pulley 3. Even when the drive pulley 3 is transmitted to the driven pulley 9, it is not necessary to make the drive pulley 3 larger than necessary, so that the arrangement space of the drive pulley 3 can be reduced and the weight thereof can be reduced.
また、駆動プーリ3における両プーリ部材4,5がリン
ク機構6により連結されて駆動力の伝達が行われること
から、ギヤの噛合等による動力伝達構造に比べ摩擦トル
クロスや騒音を小さくすることができる。しかも、両プ
ーリ部材4,5間に異物が混入したとしてもプーリ部材4,5
が損傷を受けるのを防止することができる。Further, since both the pulley members 4 and 5 of the drive pulley 3 are connected by the link mechanism 6 to transmit the driving force, it is possible to reduce the friction torque and noise as compared with the power transmission structure by the meshing of gears. . Moreover, even if foreign matter enters between the pulley members 4,5, the pulley members 4,5
Can be prevented from being damaged.
また、第1図に示すように、無負荷状態ではタイミン
グベルト10の張力が零であるので、該タイミングベルト
10の装着の際に初張力を与える必要がなく、その装着を
容易に行うことができる。なお、第1および第2リンク
7,8間の角度変化によって両プーリ部材4,5の偏心量が減
少するので、上記両リンク7,8が平面p上で完全に重な
る状態の長さを最大限とするようにタイミングベルト10
の長さを設定すれば済み、ベルト10の装着により一層有
利である。Further, as shown in FIG. 1, since the tension of the timing belt 10 is zero in the unloaded state,
It is not necessary to apply initial tension when mounting 10, and the mounting can be easily performed. Note that the first and second links
Since the eccentric amount of both pulley members 4 and 5 decreases due to the change in the angle between the pulleys 7 and 8, the timing belt 10 is designed to maximize the length of the link 7 and 8 that completely overlap each other on the plane p.
It is more advantageous to attach the belt 10 since it is sufficient to set the length.
第3図および第4図は第2実施例を示す。尚、第1図
および第2図と同じ部分については同じ符号を付してそ
の詳細な説明は省略する。3 and 4 show a second embodiment. The same parts as those in FIGS. 1 and 2 are designated by the same reference numerals, and detailed description thereof will be omitted.
この実施例では、駆動プーリ3′におけるリンク機構
6′の第1リンク7′と第2リンク8′との長さが略等
しくされ、該両リンク7′,8′は、第1および第2プー
リ部材4,5′の軸心O1,O2を通る平面pにおいて、駆動お
よび従動軸1,2間の軸心O1,O3同士を結ぶ直線lAに対しほ
ぼタイミングベルト10の緩み側(図で右下側)を横切る
ときに同一直線に沿って延びるように設定されている。In this embodiment, the lengths of the first link 7'and the second link 8'of the link mechanism 6'in the drive pulley 3'are made substantially equal, and the both links 7 ', 8'are provided with the first and second links. On the plane p passing through the shaft centers O 1 and O 2 of the pulley members 4,5 ′, the timing belt 10 is loosened substantially with respect to the straight line l A connecting the shaft centers O 1 and O 3 between the drive and driven shafts 1 and 2. It is set to extend along the same straight line when crossing the side (lower right side in the figure).
この実施例の場合、無負荷状態から駆動軸1に駆動力
が加わって負荷状態になると、第4図に示すように、第
1および第2のリンク7′,8′が第1および第2プーリ
部材4,5′の軸心O1,O2を通る平面pにおいて駆動および
従動軸1,2の軸心O1,O3同士を結ぶ直線lAに対しほぼタイ
ミングベルト10の緩み側範囲(図で右下側)を横切ると
きに、両リンク7′,8′が同じ直線上に延びて、第1プ
ーリ部材4から該両リンク7′,8′を介して第2プーリ
部材5′に駆動力が伝達される。すなわち、第2プーリ
部材5′は、両プーリ部材4,5′の軸心O1,O2を通る平面
pに沿ってタイミングベルト10の緊張側に移動させよう
とする力により、上記同じ直線上に位置した両リンク
7′,8′により引っ張られて第1プーリ部材4との偏心
量が減少するようにベルト緊張側に移動し、タイミング
ベルト10の張り側と緩み側とに常に一定の張力が分配さ
れて、そのスキップ現象を抑制することができる。その
他は、上記第1実施例と同様の作用効果を奏することが
できる。In the case of this embodiment, when the driving force is applied to the drive shaft 1 from the unloaded state to the loaded state, as shown in FIG. 4, the first and second links 7 ', 8'are brought into contact with the first and second links. In the plane p passing through the shaft centers O 1 and O 2 of the pulley members 4,5 ′, the loose side range of the timing belt 10 with respect to the straight line l A connecting the shaft centers O 1 and O 3 of the drive and driven shafts 1 and 2 When crossing (on the lower right side in the figure), both links 7'and 8'extend on the same straight line, and the first pulley member 4 and the second pulley member 5'via both links 7'and 8 '. The driving force is transmitted to. That is, the second pulley member 5 ′ is moved to the tension side of the timing belt 10 along the plane p passing through the shaft centers O 1 and O 2 of the two pulley members 4,5 ′, so that the same straight line is obtained. It is pulled by both the links 7 ', 8'located above and moves to the belt tension side so that the amount of eccentricity with the first pulley member 4 decreases, and the timing belt 10 is always fixed on the tension side and the slack side. The tension is distributed, and the skip phenomenon can be suppressed. Other than that, the same operational effects as those of the first embodiment can be obtained.
尚、上記各実施例は、自転車の駆動系に適用した場合
であるが、本発明はこの他、高い耐久性の要求される各
種のベルト伝動装置に対しても適用することができるの
は勿論のことである。Although each of the above embodiments is applied to the drive system of the bicycle, the present invention can be applied to various belt transmissions that require high durability. That is.
(発明の効果) 以上説明したように、本発明によると、タイミングベ
ルトにより従動プーリとの間で動力を伝達する駆動プー
リを、その回転軸に回転一体に支持された第1プーリ部
材と、該第1プーリ部材の外周に第1プーリ部材の軸心
に対して偏心可能に配置され、かつ第1プーリ部材にリ
ンク機構を介して連結され、外周にて上記タイミングベ
ルトに噛み合う第2プーリ部材とで構成し、第1プーリ
部材の駆動力の増大に伴い、第2プーリ部材の第1プー
リ部材に対する偏心量を連続的に減少変化させるように
したことにより、第1プーリ部材の回転を減速すること
なく1:1の回転比で第2プーリ部材に伝達でき、駆動プ
ーリの回転を増速して従動プーリに伝達する駆動系であ
っても駆動プーリの直径を小さく保ち得、よって駆動プ
ーリひいてはベルト伝動装置の配置スペースの縮小化お
よび軽量化を図ることができる。また、両プーリ部材の
リンク機構による連結により、両プーリ部材間の駆動力
伝達機構での摩擦トルクロスおよび騒音を低下させ、そ
の耐久性の向上を図ることもできるものである。(Effects of the Invention) As described above, according to the present invention, a drive pulley that transmits power between a driven pulley and a driven pulley by a timing belt, and a first pulley member that is rotatably supported integrally with its rotation shaft, A second pulley member disposed on the outer periphery of the first pulley member so as to be eccentric with respect to the axis of the first pulley member, connected to the first pulley member via a link mechanism, and meshing with the timing belt on the outer periphery; The rotation amount of the first pulley member is decelerated by continuously changing the eccentric amount of the second pulley member with respect to the first pulley member as the driving force of the first pulley member increases. Can be transmitted to the second pulley member at a rotation ratio of 1: 1 without any increase, and the diameter of the drive pulley can be kept small even with a drive system that accelerates the rotation of the drive pulley and transmits it to the driven pulley. As a result, the space for disposing the belt transmission device can be reduced and the weight thereof can be reduced. Further, by connecting the two pulley members by the link mechanism, it is possible to reduce friction torque and noise in the driving force transmission mechanism between the two pulley members and improve the durability thereof.
第1図および第2図は本発明の第1実施例を示し、第1
図は無負荷状態のベルト伝動装置を示す正面図、第2図
は同負荷状態を示す正面図である。第3図および第4図
は第2実施例を示し、第3図は第1図相当図、第4図は
第2図相当図である。第5図は従来例を示す第2図相当
図である。 1……駆動軸、2……従動軸、3,3′……駆動プーリ、
4……第1プーリ部材、5,5′……第2プーリ部材、5a,
5′a……歯部、6,6′……リンク機構、7,7′……第1
リンク、8,8′……第2リンク、9……従動プーリ、9a
……歯部、10……タイミングベルト、O1……第1プーリ
部材の軸心、O2……第2プーリ部材の軸心、O3……従動
軸の軸心、p……軸心O1,O2を通る平面、lA……軸心O1,
O3を結ぶ直線。FIGS. 1 and 2 show a first embodiment of the present invention.
The figure is a front view showing the belt transmission in an unloaded state, and FIG. 2 is a front view showing the same loaded state. 3 and 4 show a second embodiment, FIG. 3 is a view corresponding to FIG. 1, and FIG. 4 is a view corresponding to FIG. FIG. 5 is a view corresponding to FIG. 2 showing a conventional example. 1 ... drive shaft, 2 ... driven shaft, 3, 3 '... drive pulley,
4 ... first pulley member, 5, 5 '... second pulley member, 5a,
5'a ... Tooth, 6,6 '... Link mechanism, 7, 7' ... 1st
Link, 8,8 '... Second link, 9 ... Following pulley, 9a
...... Tooth, 10 …… Timing belt, O 1 …… Axis of first pulley member, O 2 …… Axis of second pulley member, O 3 …… Axis of driven shaft, p …… Axis center A plane passing through O 1 and O 2 , l A …… axis O 1 and
A straight line connecting O 3 .
Claims (3)
それぞれ支持された歯付プーリからなる駆動および従動
プーリと、該両プーリ間に巻き掛けられて両回転軸間で
動力を伝達するタイミングベルトとを備え、上記駆動プ
ーリは、回転軸に回転一体に支持された第1プーリ部材
と、該第1プーリ部材の外周に第1プーリ部材の軸心に
対して偏心可能に配置され、外周に上記タイミングベル
トに噛み合う歯部を有する第2プーリ部材と、一端が上
記第1プーリ部材の外周に所定角度間隔をあけてかつ回
転軸と直交する面内で揺動可能に支持された複数の第1
リンクと、一端が該各第1リンクの他端に揺動可能に連
結され、他端が上記第2プーリ部材の円周に所定角度間
隔をあけてかつ回転軸と直交する面内で揺動可能に支持
された複数の第2リンクとからなることを特徴とする自
動張力調整機構を有するベルト伝動装置。Claim: What is claimed is: 1. A pair of rotating shafts parallel to each other, drive and driven pulleys each composed of a toothed pulley supported by the rotating shafts, and powers between the rotating shafts wound around the pulleys. And a timing belt for transmitting the driving pulley, wherein the drive pulley is rotatably supported integrally with a rotating shaft, and a first pulley member is disposed on the outer periphery of the first pulley member so as to be eccentric with respect to the axis of the first pulley member. And a second pulley member having a tooth portion meshing with the timing belt on the outer periphery, and one end of which is swingably supported on the outer periphery of the first pulley member at a predetermined angular interval and in a plane orthogonal to the rotation axis. Multiple first
The link and one end thereof are swingably connected to the other ends of the respective first links, and the other end is swingable in a plane orthogonal to the rotation axis with a predetermined angular interval on the circumference of the second pulley member. A belt transmission having an automatic tension adjusting mechanism, which comprises a plurality of second links movably supported.
それぞれ支持された歯付プーリからなる駆動および従動
プーリと、該両プーリ間に巻き掛けられて両回転軸間で
動力を伝達するタイミングベルトとを備え、上記駆動プ
ーリは、回転軸に回転一体に支持された第1プーリ部材
と、該第1プーリ部材の外周に第1プーリ部材の軸心に
対して偏心可能に配置され、外周に上記タイミングベル
トに噛み合う歯部を有する第2プーリ部材と、一端が上
記第1プーリ部材の外周に所定角度間隔をあけてかつ回
転軸と直交する面内で揺動可能に支持された複数の第1
リンクと、一端が該各第1リンクの他端に揺動可能に連
結され、他端が上記第2プーリ部材の円周に所定角度間
隔をあけてかつ回転軸と直交する面内で揺動可能に支持
された複数の第2リンクとからなり、上記第1および第
2の各リンクは、第1プーリ部材の駆動力の増大に伴
い、両リンク間の連結角度が変化して、第1および第2
プーリ部材の軸心を通る平面において両回転軸の軸心同
士を結ぶ直線に対しほぼタイミングベルトの緊張側を横
切るときに互いに重なるように設定されていることを特
徴とする自動張力調整機構を有するベルト伝動装置。2. A pair of rotating shafts which are parallel to each other, a driving and a driven pulley formed of toothed pulleys respectively supported by the rotating shafts, and a power which is wound between the pulleys and wound between the rotating shafts. And a timing belt for transmitting the driving pulley, wherein the drive pulley is rotatably supported integrally with a rotating shaft, and a first pulley member is disposed on the outer periphery of the first pulley member so as to be eccentric with respect to the axis of the first pulley member. And a second pulley member having a tooth portion that meshes with the timing belt on the outer periphery, and one end of which is swingably supported on the outer periphery of the first pulley member with a predetermined angular interval and in a plane orthogonal to the rotation axis. Multiple first
The link and one end thereof are swingably connected to the other ends of the respective first links, and the other end is swingable in a plane orthogonal to the rotation axis with a predetermined angular interval on the circumference of the second pulley member. A plurality of second links supported so that the first and second links change the connecting angle between the first and second links as the driving force of the first pulley member increases. And the second
It has an automatic tension adjusting mechanism characterized in that it is set so as to overlap each other when it crosses the tension side of the timing belt substantially with respect to a straight line connecting the axes of both rotary shafts in a plane passing through the axis of the pulley member. Belt transmission.
それぞれ支持された歯付プーリからなる駆動および従動
プーリと、該両プーリ間に巻き掛けられて両回転軸間で
動力を伝達するタイミングベルトとを備え、上記駆動プ
ーリは、回転軸に回転一体に支持された第1プーリ部材
と、該第1プーリ部材の外周に第1プーリ部材の軸心に
対して偏心可能に配置され、外周に上記タイミングベル
トに噛み合う歯部を有する第2プーリ部材と、一端が上
記第1プーリ部材の外周に所定角度間隔をあけてかつ回
転軸と直交する面内で揺動可能に支持された複数の第1
リンクと、一端が該各第1リンクの他端に揺動可能に連
結され、他端が上記第2プーリ部材の円周に所定角度間
隔をあけてかつ回転軸と直交する面内で揺動可能に支持
された複数の第2リンクとからなり、上記第1および第
2の各リンクは、第1プーリ部材の駆動力の増大に伴
い、両リンク間の連結角度が変化して、第1および第2
プーリ部材の軸心を通る平面において両回転軸の軸心同
士を結ぶ直線に対しほぼタイミングベルトの緩み側を横
切るときに同一直線に沿って延びるように設定されてい
ることを特徴とする自動張力調整機構を有するベルト伝
動装置。3. A pair of rotating shafts parallel to each other, drive and driven pulleys each comprising a toothed pulley supported by the rotating shafts, and powers between the rotating shafts wound around the pulleys. And a timing belt for transmitting the driving pulley, wherein the drive pulley is rotatably supported integrally with a rotating shaft, and a first pulley member is disposed on the outer periphery of the first pulley member so as to be eccentric with respect to the axis of the first pulley member. And a second pulley member having a tooth portion meshing with the timing belt on the outer periphery, and one end of which is swingably supported on the outer periphery of the first pulley member at a predetermined angular interval and in a plane orthogonal to the rotation axis. Multiple first
The link and one end thereof are swingably connected to the other ends of the respective first links, and the other end is swingable in a plane orthogonal to the rotation axis with a predetermined angular interval on the circumference of the second pulley member. A plurality of second links supported so that the first and second links change the connecting angle between the first and second links as the driving force of the first pulley member increases. And the second
The automatic tension is set so that it extends along the same straight line when it crosses the slack side of the timing belt with respect to the straight line that connects the shaft centers of both rotary shafts in a plane that passes through the shaft center of the pulley member. Belt transmission with adjusting mechanism.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP63026873A JP2547809B2 (en) | 1988-02-08 | 1988-02-08 | Belt transmission device with automatic tension adjustment mechanism |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP63026873A JP2547809B2 (en) | 1988-02-08 | 1988-02-08 | Belt transmission device with automatic tension adjustment mechanism |
Publications (2)
Publication Number | Publication Date |
---|---|
JPH01203749A JPH01203749A (en) | 1989-08-16 |
JP2547809B2 true JP2547809B2 (en) | 1996-10-23 |
Family
ID=12205413
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP63026873A Expired - Lifetime JP2547809B2 (en) | 1988-02-08 | 1988-02-08 | Belt transmission device with automatic tension adjustment mechanism |
Country Status (1)
Country | Link |
---|---|
JP (1) | JP2547809B2 (en) |
-
1988
- 1988-02-08 JP JP63026873A patent/JP2547809B2/en not_active Expired - Lifetime
Also Published As
Publication number | Publication date |
---|---|
JPH01203749A (en) | 1989-08-16 |
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