Disclosed is a crank variable-speed gear device (100) wherein the gear ratio can be increased to 1.6:1 to 1.8:1 through a gear assembly and a latch assembly, and the gear ratio can also be changed to 1:1, if necessary, thereby providing an excellent transmission efficiency, facilitating the manipulation thereof, and making it possible to provide a compact and lightweight bicycle. A gear assembly is disposed inside the housing (120) of the crank variable-speed gear device (100) and on one side thereof, and a latch assembly is disposed inside the housing (120) and on the other side thereof. The gear assembly comprises a sun gear (140) having a first latch engaging portion (145) formed on a radial outer surface on one side thereof, planetary gears 150, and a ring gear (160). The latch assembly comprises: a latch body (170) having multiple latch sites (175) formed on a radial inner surface thereof; multiple first latches (118) disposed at the latch sites (175), respectively; a latch ring (180) disposed to be inserted into the latch body (170) and having a second latch engaging member (182) formed on a radial inner surface thereof; a second latch (176) disposed in a second latch insertion groove (147) formed on the radial outer surface of the sun gear (140) such that the upper end thereof engages with the second latch engaging member (182); a latch guide (190) disposed in the latch body (170); a lock ring (200) mounted on the radial outer surface of the latch body (170); and a ring-shaped fastening bracket (220) fixed/mounted on a side surface of the latch body (170) .


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    Title :

    CRANK VARIABLE-SPEED GEAR DEVICE FOR INCREASING ROTATIONAL POWER


    Additional title:

    KURBELTRIEBVORRICHTUNG MIT VERÄNDERLICHER DREHZAHL ZUR ERHÖHUNG DER DREHLEISTUNG
    DISPOSITIF D'ENGRENAGE À VITESSE VARIABLE DE MANIVELLE POUR AUGMENTER LA PUISSANCE DE ROTATION


    Contributors:

    Publication date :

    2022-08-10


    Type of media :

    Patent


    Type of material :

    Electronic Resource


    Language :

    English


    Classification :

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



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