PROBLEM TO BE SOLVED: To provide a toothed belt diving device for bicycle which can suppress a noise from a drive pulley and maintain a smooth engagement of pulley groove parts of the drive pulley and belt teeth even under an environment where a foreign substance may attach to the toothed belt and the drive pulley.SOLUTION: A toothed belt 4 includes a plurality of belt teeth 10 having both sides in a longitudinal direction of the belt being flat or outwardly curved. Pulley groove parts 20 formed on an outer circumference of a drive pulley 2 and engaging with the belt teeth 10 have facing surfaces thereof being outwardly curved, the pulley groove parts 20 consisting of two pins 23 having a gap therebetween to which the belt teeth 10 engage with and a part of a groove bottom 30a surrounding a rotational center Cr of the drive pulley 2 and that is not in contact with the belt teeth 10. A circle that passes a position farthest from the rotational center Cr of the two pins 23 and at least a part of a space from the groove bottom 30a is opened at least in one direction in a direction of the rotational center Cr.SELECTED DRAWING: Figure 4

    【課題】歯付ベルトと駆動プーリに異物が付着する環境下にあっても、駆動プーリにおける異音を抑制できると共に、駆動プーリのプーリ溝部とベルト歯部との円滑な噛み合いを維持できる自転車用歯付ベルト駆動装置を提供する。【解決手段】歯付ベルト4は、ベルト長手方向の両側面が平坦状または外側に膨らんだ湾曲状に形成された複数のベルト歯部10を有する。駆動プーリ2の外周部に形成されてベルト歯部10と噛み合うプーリ溝部20は、互いに対向する面が外側に膨らんだ湾曲状に形成されており、その隙間にベルト歯部10が係合される2つのピン部23と、駆動プーリ2の回転中心Crを取り囲むように配置されて、ベルト歯部10と接触しない溝底面30aの一部とによって形成される。2つのピン部23のCrから最も離れた位置を通る円周と、溝底面30aとの間の空間の少なくとも一部は、Cr方向の少なくとも一方向に開放されている。【選択図】図4


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    Title :

    TOOTHED BELT DRIVING DEVICE FOR BICYCLE


    Additional title:

    自転車用歯付ベルト駆動装置


    Contributors:

    Publication date :

    2017-03-09


    Type of media :

    Patent


    Type of material :

    Electronic Resource


    Language :

    Japanese


    Classification :

    IPC:    F16H Getriebe , GEARING / B62M RIDER PROPULSION OF WHEELED VEHICLES OR SLEDGES , Antrieb von Radfahrzeugen oder Schlitten durch den Fahrer



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