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Old 2012-05-18, 01:58 AM   #15
Justin LE
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Join Date: May 2010
Location: Vancouver
Age: 33
Posts: 104
Nuvinci Work

For those following the previous multi-gear unicycle discussions, the issue of reverse torque transmission comes up because all bicycle hubs intrinsically freewheel backwards (with the exception of the S3X), making them incompatible with a unicycle drive.

The idea for solving this on the nuvinci was to install a 1-way ball bearing to lock the hub in reverse with a 1:1 gear ratio. So going forwards it has variable gearing through the CVT tranmission, while going backwards it is locked 1:1 with the sprague clutch.

To do this I first had to machine the Nuvinci hub down to size a bit in order to have flat reference surfaces for attaching a new side cover plate that accepts the 1-way bearing. Also took off the spoke flanges which aren't necessary in a jackshaft application.
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