Multiple sprocket assembly

摘要

A multiple sprocket assembly for receiving a chain and transferring torque therefrom to a bicycle rear wheel hub rotatable about a hub axis. The chain has alternating pairs of inner and outer link plates connected by chain rollers. The multiple sprocket assembly includes a plurality of different-sized sprockets arranged coaxially about the rear wheel hub. The sprockets have a plurality of teeth and tooth roots spaced around a periphery of the sprockets for engaging the chain. The tooth roots forming a dedendum circle. The sprockets have a maximum sprocket width near the dedendum circle, substantially bridging a gap between paired inner link plates sandwiching the chain roller therebetween, substantially minimizing axial play between a guide area on the sprocket and an overhang of the inner link plates overlapping the guide area when the chain is engaged with the sprockets.

主权项

1. A multiple sprocket assembly for receiving a chain and transferring torque therefrom to a bicycle rear wheel hub rotatable about a hub axis, the chain including alternating pairs of inner and outer link plates connected by chain rollers, the multiple sprocket assembly comprising:
a plurality of different-sized sprockets arranged coaxially about the rear wheel hub, the sprockets having a plurality of teeth and tooth roots spaced around a periphery of the sprockets for engaging the chain, the tooth roots forming a dedendum circle, the teeth having a first guide slope on a tooth back face facing an adjoining larger sprocket, the first guide slope extending from a tooth tip to the dedendum circle, the tooth tip having a second guide slope on the tooth back face and a third guide slope on a tooth front face facing an adjoining smaller sprocket, the second and third guide slopes meeting at a line defining a ridge therebetween.