Propelled bicycle with automatic transmission

1. An automatic transmission bicycle comprising:

a bicycle frame;

a front fork rotatably coupled to the bicycle frame;

a chain ring rotatably coupled to the bicycle frame, the chain ring comprising an output gear and an input gear;

a pair of pedals attached to the chain ring;

a rear wheel rotatably coupled to the bicycle frame;

a front wheel rotatably coupled to the front fork;

a plurality of gears coupled to the bicycle frame, the plurality of gears having a plurality of gear combinations defined by at least two cooperatively engaged gears;

a first chain extendable about the chain ring and operative to drive the rear wheel;

a motor coupled to the bicycle frame, the motor having an output gear;

a second chain extendable about the output gear of the motor and the input gear of the chain ring for rotateably driving the chain ring under power of the motor;

a voltage generator coupled to the front fork or the bicycle frame, the voltage generator in mechanical communication with the front or rear wheel and configured to generate a current having a corresponding voltage dependent upon a rotational speed of the front or rear wheel; and

a gear shifter coupled to the bicycle frame, the gear shifter in electrical communication with the voltage generator and configured to receive the current generated by the voltage generator, the gear shifter configured to exert a mechanical force upon the plurality of gears to shift between two respective gear combinations of the plurality of gear combinations in response to receiving the current from the voltage generator, the gear shifter including:

a cable in mechanical communication with the plurality of gears, the cable defining a cable axis and configured to move axially along the cable axis in response to the gear shifter receiving the current from the voltage generator within a predetermined voltage range; and

a torsion spring in mechanical communication with the cable, the torsion spring configured to exert a force upon the cable dependent upon the gear shifter receiving the current within a predetermined Voltage range.

2. The automatic transmission bicycle according to claim 1 wherein the gear shifter further comprises a processor unit operative to shift the plurality of gears between gear combinations based on the current received from the voltage generator.

3. The automatic transmission bicycle according to claim 2 wherein the processor unit has an adjustable associated voltage range for each gear combination from the plurality of gear combinations, the processor unit determines appropriate gear combinations from the plurality of gear combinations in response to receiving the current from the voltage generator within a predetermined voltage range.

4. The automatic transmission bicycle according to claim 1 wherein the gear shifter is configured to continuously receive the current generated by the voltage generator during rotation of the front or rear wheel.

5. The automatic transmission bicycle according to claim 1 wherein the electric motor is coupled to the bicycle frame between the chain ring and the wheel.

6. The automatic transmission bicycle according to claim 1 further comprising a battery coupled to the bicycle frame adjacent to the chain ring, the battery in electrical communication with the electric motor.

7. The automatic transmission bicycle according to claim 1 wherein the plurality of gears is a planetary gear system.

8. The automatic transmission bicycle according to claim 1 wherein the motor is an electric motor.