Internally geared hub for bycicle

摘要

An internally geared hub is provided with a hub axle (12), a hub shell (14), a driver (16), a planetary gear mechanism (32) and a gear changing mechanism (20). The hub shell (14) rotates freely about the hub axle (12). The driver (16) rotates freely relative to both the hub axle (12) and the hub shell (14). The planetary gear mechanism (32) is operatively connected between the hub shell (14) and the driver (16). The planetary gear mechanism (32) includes a plurality of driver rotation transmission paths that transmits rotation of the driver in a prescribed operating direction to the hub shell, and a hub shell rotation transmission path that transmits rotation of the hub shell in the prescribed operating direction to the driver. The gear changing mechanism (20) is operatively connected to the planetary gear mechanism (32) for selectively establishing one of the driver rotation transmission paths or the hub shell rotation transmission path.