Patent ID: 6478710
Filing Date: 2002-11-12
Classification: B62M

Abstract:
A shifting device for a multi-speed hub for a bicycle, comprisinga hub axle; a driver; a hub sleeve; at least one epicyclical transmission, each comprising at least one annulus, at least one planet carrier, planet wheels and at least one sun wheel for transmitting rotational power between the driver and the hub sleeve through different transmission paths; wherein one of the controllable feewheel clutches transmits rotational power between the annulus and the hub sleeve; a control device to select between different transmission paths for change gear ratios in the transmission with at least two controllable freewheel clutches, the control device being actuated by a remote control; wherein the control device has a shift unit comprising a shift sleeve and a shift bushing, each of which has, on the sides facing the controllable freewheel clutches, profiles which can disengage the controllable freewheel clutches under load by a relative rotation between the controllable freewheel clutch and at least one of the shift sleeve and shift bushing when the gear ratios are changed, the relative rotation between the controllable freewheel clutch and shift sleeve and between the controllable freewheel clutch and shift bushing caused by elements which are components of the transmission path.