BICYCLE WHEEL HUB BUSHING WITH BUILT IN SPEED-CHANGE MECHANISM (VERSIONS) Russian patent published in 2004 - IPC

FIELD: transport engineering. SUBSTANCE: invention relates to transmissions with planetary gear wheels built-in or adjoining wheel hub, with automatic gear changing under action of centrifugal force. Proposed bushing has axle, driving unit 22 with driven chain sprocket, driven unit 23 with bushing housing 60 serving as wheel hub. The following speeds are provided. In one, planetary mechanism changes speed of rotation of driving unit 22 coupled with chain driven sprocket at transmission to driven unit 23 coupled with bushing housing 60 serving as wheel hub. In other, pawls 71 couple directly driving unit 22 and driven unit 23. Rocking weights 77 are coupled by hinge tie-rod 78 with control plate 75 to increase its turning at control of pawls 71. To increaser sensitivity, rocking weights 77 can be arranged on outer surface of driven unit 23. EFFECT: increased angle of turning of control member relative to angle of turning of rocking weight, improved smoothness of gear shifting. 41 cl, 26 dwg