Patent ID: 7832919

Claim:
A gear for driving a drum of a ready-mix concrete truck, the gear comprising: a driven flange ( 12 ) for connection to the drum; a stationary housing ( 1 ) for connection to a frame of the truck; a motor ( 5 ) axially supported within the stationary housing ( 1 ) by a motor bearing ( 9 ); and only one single-stage planetary gear ( 23 ) including: a single inner spider gear ( 7 ) driving a single outer spider gear ( 16 ) of the planetary gear ( 23 ) via a plurality of planet wheels ( 15 ) mounted on a single planet carrier ( 17 ) of the planetary gear ( 23 ); the planet carrier ( 17 ) being directly connected to the stationary housing ( 1 ); the motor ( 5 ) being connected to and directly driving the single inner spider gear ( 7 ) via an internal bore ( 18 ) of the single planet carrier ( 17 ); the single outer spider gear ( 16 ) being coupled to the driven flange ( 12 ) for rotationally driving the driven flange ( 12 ); and the driven flange ( 12 ) being rotationally mounted on a mounting bearing ( 11 ) located between the driven flange ( 12 ) and the motor ( 5 ).