Toothed belt driving device for bicycle
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United States of America Patent
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Apr 24, 2018
Issued Date -
N/A
app pub date -
Aug 19, 2014
filing date -
Aug 30, 2013
priority date (Note) -
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Abstract
The present invention relates to a toothed belt driving device for bicycle, in which, in drive state, the pulley groove portion of a driven pulley is in surface contact with a portion of a surface of the belt tooth portion, this portion in surface contact is present in a range positioned closer to a tooth root portion than a reference circle, the maximum value of the shortest distance between the pulley groove portion of the driven pulley and the surface of the belt tooth portion opposite to the traveling direction of the belt is 10% or more and 18% or less of the tooth pitch, a groove depth of the driven pulley is greater than the tooth height of the belt tooth portion, and the difference therebetween is 5% or more of the tooth height.
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