TOOTHED WHEEL AND GROUP OF TOOTHED WHEELS FOR A BICYCLE TRANSMISSION SYSTEM
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United States of America Patent
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N/A
Issued Date -
Oct 15, 2009
app pub date -
Jan 13, 2009
filing date -
Apr 10, 2008
priority date (Note) -
Abandoned
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Abstract
A toothed wheel for a chain transmission system for a bicycle, intended to be coupled with at least one other toothed wheel in a group of crowns or of sprockets rotating as a unit has a plurality of teeth that follow one another on the radially outer periphery of the toothed wheel, alternating with grooves. Each tooth has a thickness, a width and a height and has an idle flank, passive in the exchange of torque with a bicycle chain, and a pressure flank, active in the exchange of torque with the same chain. The toothed wheel has at least one gearshifting helping tooth the height of which, measured from the bottom of an adjacent groove, decreases in the direction of the pressure flank, in any case being greater than or equal to 90% of the radius of the pin.
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