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    • 10. 发明授权
    • Conical worm gear for a multi-speed bicycle drive mechanism
    • 用于多速自行车驱动机构的锥形蜗轮
    • US4831889A
    • 1989-05-23
    • US194972
    • 1988-05-17
    • Edward Howard
    • Edward Howard
    • B62M17/00F16H3/06
    • B62M17/00F16H3/06Y10T74/1934Y10T74/19833
    • A multi-speed chainless drive mechanism for a cycle-type vehicle comprises a drive shaft rotatably driven by a pedal actuated gear train. The drive shaft, which includes a universal joint, extends away from the gear train. The drive mechanism also comprises a first support provided intermediate the gear train and the universal joint for rotatably supporting the drive shaft to a frame of the vehicle. An elongated shaft extends from the universal joint opposite the gear train. A variable ratio worm gear, more particularly a cone-shaped worm gear, has an opening defined centrally and longitudinally therethrough. The worm gear is slidably mounted on the elongated shaft and is adapted for rotation therewith. The worm gear meshes with a drive gear mounted to a drive wheel of the vehicle. Different gear ratios are thus provided in relation to the longitudinal position of the worm gear on the elongated shaft. The drive mechanism also comprises a gear shifting device for moving the worm gear along the elongated shaft and for constantly maintaining the worm gear and the drive gear in a mesh.
    • 用于循环型车辆的多速无链驱动机构包括由踏板致动齿轮系可旋转地驱动的驱动轴。 包括万向接头的传动轴远离齿轮系。 驱动机构还包括设置在齿轮系中间的第一支撑件和用于将驱动轴可旋转地支撑到车辆框架的万向接头。 细长轴从与齿轮系相对的万向接头延伸。 可变比蜗杆,更具体地是锥形蜗轮具有中心并纵向穿过其中的开口。 蜗轮可滑动地安装在细长轴上并适于与其一起旋转。 蜗轮与安装在车辆驱动轮上的驱动齿轮啮合。 因此,相对于细长轴上的蜗轮的纵向位置提供不同的齿轮比。 驱动机构还包括用于沿着细长轴移动蜗轮并且用于将蜗轮和驱动齿轮恒定地保持在网中的换档装置。