Multi-Speed Internal Gear Hub for a Bicycle
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United States of America Patent
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Issued Date -
Jun 2, 2011
app pub date -
Nov 29, 2010
filing date -
Nov 28, 2009
priority date (Note) -
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Abstract
A bicycle multi-speed internal gear hub including a hub axle, a hub shell rotatably mounted about the hub axle, a driver rotatably mounted about the hub axle and at least two gear stages providing at least two gear ratios. Each gear stage includes a planetary gear mechanism having at least one sun gear, a sun gear clutch connecting the sun gear and the hub axle to rotate together, a planet carrier and a ring gear. The at least two gear stages connected in series. One of the at least two gear stages is an overdrive gear stage with a greater speed at a gear stage output then at a gear stage input, the other of the at least two gear stages is an underdrive gear stage with a lower speed at the gear stage output than at the gear stage input. One of the at least two gear stages is coupled to the driver and the other of the at least two gear stages is coupled to the hub shell. One of the at least two gear stages provides a plurality of smaller gear ratios, the other of the at least two gear stages provides a plurality of larger gear ratios. A direct drive gear stage with a gear ratio of 1:1 is not used in one of the at least two gear stages.
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