| 摘要 |
This transmission operates by use of a drive shaft, that by being extendible and retractable, can vary in length. Gears on each end of the drive shaft deliver power from one of a number of concentric rings of gear teeth on a pedal drive to a similar arrangement on a wheel drive. The drive shaft by moving between these concentric rings can vary the gear ratios of the power delivered. A cam wheel and spring mounted ball bearings are employed to change the length of the drive shaft and especially, lift the drive shaft off of the pedal drive/wheel drive as it disengages and set it down to engage the next set of concentric gears. An alternative method to the use of a cam wheel that performs the same function is also described. This allows a radial taper to all engaging gears and a deeper seat.
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