Patent ID: 6974399

Claim:
An electrically driven hub comprising: a hub ( 1 ) having a chamber ( 10 ) defined therein and a cover ( 12 ) connected to the hub ( 1 ) to seal the chamber ( 10 ); an electrical mechanism ( 2 ) received in the chamber ( 10 ) so as to drive the hub ( 1 ) and comprising an electrical motor ( 20 ) including a stator ( 21 ) and a rotor ( 22 ) which is rotated relative to the stator ( 21 ), a first fixed shaft ( 23 ) connected to a first end of the stator ( 21 ) and a second fixed shaft ( 24 ) connected to a second end of the stator ( 21 ), an output shaft ( 25 ) connected to the rotor ( 22 ); a planetary gear system ( 3 ) having a sun gear ( 30 ) which is mounted to the output shaft ( 25 ), a support board ( 31 ) fixed to the electrical motor ( 20 ) and having a plurality of planet gears ( 33 ) connected thereto by pivotal rods ( 32 ), and the sun gear ( 30 ) matched with the planet gears ( 33 ), a sub-gear ( 34 ) co-axially connected to each of the planet gears ( 33 ); a gear ring ( 4 ) for driving the hub ( 1 ) and having teeth ( 40 ) defined in an inner periphery thereof, the teeth ( 40 ) matched with the sub-gears ( 34 ), and two bearings ( 5 ) respectively connected to the first fixed shaft ( 23 ) and the second fixed shaft ( 24 ) and the hub ( 1 ) so that the hub ( 1 ) is rotatable relative to the electrical mechanism ( 2 ).