ANDEGURO Bike with CVT Hub
bicycle hub with continuously variable gear (based on CVT Edyson concept)
using only pinions for the mechanical transmission
This is not an epicicloidal transmission !
Edyson CVT is a new concept mechanical transmission system with continuous variation without using friction, but only internal pinions with the high torque capability.
This CVT for bicycle was designed to REPLACE the cassette sprockets mounted on the rear wheel together at the dérailleur system using only one rear (chain/belt) sprocket..
Patent Protected Technology !
The continuously variable transmission hub based on Edyson CVT using only pinions, can change under stress or when stationary, with a simple movement of the control knob (similar to the normal gearbox).
Unlike other solutions already existing the present invention uses only normal toothed pinions inside it, without any element that could slip or belts that work by friction, the fact mode that allows the continuous variation of the transmission ratio in a more efficient.
A variation to choose any value in the range available without interruption or jumps in cycling.
Continuously variable transmission working only by pinions (no friction).
Ratio range can change during operation, or even when stationary.
Can be use with chain or the rubber belt, without any tensioner.
Manual or automatic control of ratio, in concordance with torque / speed request.
The maximum continuous variation ratio can reach more then 400% for example: 40 teeth to of the equivalent sprocket 10 teeth (or 44 teeth to of the equivalent sprocket 11 teeth, etc...).
Our new prototype will have 360% ratio using an 36 teeth rear pinion to reach on maximum variation an equivalent of 10 teeth.
The rear pinion can also be bigger or smaller to satisfy the necessity of any biker. The chain-ring and crank arm lengths can be adapt to any rider without restrictions.
Maximum dimensions: length: 240mm, height: 210mm, width: 45mm
Weight: around 1000 g (using only aluminum and steel) with possibility to reduce it
Mechanical efficiency: 97%
In the tests with assisted bicycle with electronic choice of ratio, we have proving the increasing of the efficiency in acceleration and battery life time.
The calculation of the efficiency of Edyson CVT has been done by the University of Padua and can reached the following LINK.
Edyson CVT bring a lot of benefits into an electric motors transmission (and also on other transmission systems) because can maintain the electric motor at a relatively constant speed (selected at an optimum efficiency/torque point for the motor) and adjust the vehicle's forward speed by varying the transmission ratio over a smooth continuous range with electronic choice of ratio.
With an efficency about 97% you loose only 3% of energy instead of much more in heat with AC motor and controller.