Patent ID: 6039671
Filing Date: 2000-03-21
Classification: B62M

Abstract:
A multi-speed drive hub for bicycles, comprising:a hub axle;a hub sleeve mounted coaxially and rotatably on said hub axle;an epicyclical gear unit mounted concentrically on said hub axle and having a ring gear, a planet-gear carrier, a plurality of double planet gears mounted rotatably on said planet-gear carrier, and two sun gears meshing with said double planet gears, said ring gear meshing with said double planet gears;a drive-side coupling gear;an output-side coupling gear connected to said hub sleeve;first tooth means for connecting said drive-side coupling gear to one of said ring gear and said planet-gear carrier;second tooth means for connecting said output-side coupling gear to one of said planet-gear carrier and said ring gear; anda spring-loaded shift link mounted coaxially on and slidable axially of said hub axle and having a plurality of axially spaced radial lugs provided thereon, said drive-side coupling gear and said output-side coupling gear being connected to said shift link to be displaced therewith along said hub axle, said radial lugs engaging selectively said sun gears when said shift link is displaced along said hub axle.