Patent ID: 7588113

Claim:
A wheel drive for an industrial vehicle, the wheel drive comprising: a first electric prime mover ( 1 ) having a first drive shaft ( 2 ) driving an output ( 6 ), via at least one spur gear transmission ( 4 ), in a desired rotational direction which is drivingly coupled to a drive wheel ( 7 ); a second electric prime mover ( 8 ) driving a second drive shaft ( 9 ) being coupled with the output ( 6 ) such that by rotation of the second drive shaft ( 9 ) of the second electric prime mover ( 8 ), the output ( 6 ) rotates in a desired direction to provide a desired steering motion for the wheel drive; a brake ( 19 ) for braking the drive wheel ( 7 ); the first electric prime mover ( 1 ), the second electric prime mover ( 8 ) and the brake ( 19 ) all being disposed co-axially with the second drive shaft ( 9 ) of the second prime mover ( 8 ) and contained within a common housing with the second electric prime mover ( 8 ) being located vertically below the first electric prime mover ( 1 ); and the brake ( 19 ) being located between the first prime mover ( 1 ) and the second prime mover ( 8 ); wherein the second drive shaft ( 9 ) drives an inner central wheel ( 10 ) of a planetary transmission ( 11 ) having planetary gears ( 12 ) operative connected with a first hollow gear ( 13 ) and a second hollow gear ( 14 ), the first hollow gear ( 13 ) and the second hollow gear ( 14 ) have different numbers of teeth, and the first hollow gear ( 13 ) communicates with one part of the industrial vehicle and the second hollow gear ( 14 ) communicates with a rotating part ( 16 ).