Driving wheel for vehicles

1. A driving wheel for a vehicle, the driving wheel comprising:

a wheel rim;

a housing connected to the wheel rim, wherein the housing defines an installation space inside the housing and the installation spaces includes a first, a second, a third and a central installation spaces;

a driving force generating mechanism disposed in the installation space; and

a driving force transfer mechanism connected to the driving force generating mechanism and configured to transfer a driving force generated from the driving force generating mechanism to the housing,

wherein the housing includes a first prong for defining the first installation space, a second prong for defining the second installation space and a third prong for defining the third installation space, each one end of the prongs being connected to the rim,

wherein the first, second and third prongs are arranged in three different radial directions,

wherein the driving force generating mechanism includes a first motor disposed in the first installation space and a second motor disposed in the second installation space,

wherein a battery is disposed in the third installation space,

wherein the central installation space is configured for disposing the driving force transfer mechanism including a first pinion gear driven by the first motor, a second pinion gear driven by the second motor, and a third pinion gear connected to a shaft,

wherein the first and second pinion gears engage with the third pinion gear,

wherein the housing is driven by a combined force of the first and second pinion gears when the first and second gears are driven by the first and second motors, and

wherein the shaft is connected to a right side wall of the housing through a bearing and with a left side wall of the housing through another bearing such that the housing is configured to drive the motorized wheel.

2. The driving wheel of claim 1 , further comprising:

a controller disposed in the installation space and electrically connected with the driving force generating mechanism; and

a power source to provide electric power to the controller and the driving force generating mechanism.

3. The driving wheel of claim 1 , wherein the housing is configured to be detachably attached to the wheel rim.

4. The driving wheel of claim 1 , wherein the vehicle is a bicycle.

5. The driving wheel of claim 1 , wherein the housing includes at least one opening located on one of the right and left side walls of the housing such that at least one of the driving force generating mechanism and the power source can be replaced through the at least one opening.

6. The driving wheel of claim 5 , wherein the housing includes at least one cover for covering the at least one opening.

7. The driving wheel of claim 6 , wherein the at least one cover includes a fastener for detachably attaching the at least one cover to the housing.

8. The driving wheel of claim 1 , wherein the housing includes a plurality of openings for circulating air into the housing, the plurality of openings being disposed on at least one of the right side wall and the left side wall thereof.

9. The driving wheel of claim 1 , wherein both of the first motor and second motor are configured to drive at the same time.

10. The driving wheel of claim 9 , wherein the first motor, the second motor and the power source have the same weight.

11. The driving wheel of claim 1 , wherein the driving force transfer mechanism is disposed in the middle of the housing, and wherein the first motor, the second motor and the power source are disposed in three different radial directions.

12. The driving wheel of claim 1 , wherein the driving force transfer mechanism includes the shaft connected to a frame of the vehicle.

13. The driving wheel of claim 2 , wherein the power source is a replaceable battery.

14. A driving unit configured to be detachably attached to a wheel rim for a vehicle, the driving unit comprising:

a driving housing;

a first motor for driving a first pinion gear located inside the driving housing and fixed to the driving housing;

a second motor for driving a second pinion gear facing the first pinion gear, located inside the driving housing and fixed to the driving housing;

a third pinion gear located between the first and second motors, wherein the third pinion gear engages with the first and second pinion gears, and the combined driving force of the first and second pinion gears is applied to the third pinion gear; and

a shaft fixed to the third pinion gear at a center of the third pinion gear and disposed perpendicularly to the axes of the first and second pinon gears,

wherein the shaft and the third pinion gear are fixed to a frame of the vehicle, and

wherein the driving housing including the first and second motors rotates with respect to the fixed shaft and the third pinion gear when the first and second pinion gears are driven by the first and second motors respectively.

15. The driving unit of claim 14 , further comprising a bearing located between the driving housing and the shaft.