Patent ID: 6267704
Filing Date: 2001-07-31
Classification: B62M

Abstract:
A multiple-speed transmission wheel hub for imparting torque to a drive wheel, comprising:a hub shell formed around a wheel axis;a clutch wheel formed around the wheel axis and axially movable between at least first and second speed positions, first gearing coupling the clutch wheel to the hub shell when the clutch wheel is in the first position to produce a first transmission speed, second gearing coupling the clutch wheel with the hub shell when the clutch wheel is in the second speed position to produce a second transmission speed; anda speed-shifting cam disposed on the axis and axially rotatable between at least first and second speed positions, helical segments formed on a surface of the clutch wheel facing the cam, the helical segments coupling to the cam to translate rotation of the cam into axial displacement of the clutch wheel both from the second speed position to the first speed position and from the first speed position to the second speed position.