Patent ID: 6615946
Filing Date: 2003-09-09
Classification: B60K,B60L,Y02P,Y02T

Abstract:
A power plant for electric earth-moving vehicles with four wheel drive, comprising a supporting chassis, an electric motor drive for driving wheels of the vehicle, said motor drive comprising a gear-type reduction and distribution unit which is installed in a housing which is rigidly coupled to said chassis, a front longitudinal distribution shaft and a rear longitudinal distribution shaft which protrude from said housing, at least two electric traction motors whose body is fixed to said housing such that the two motors are connected to said distribution shafts, two differentials which are fitted at the ends of said distribution shafts and from which a front axle and a rear axle respectively protrude for respective pairs of said driving wheels, at least one of said axles being provided with steering elements; a supporting element for an oscillating support of said front axle which is fixed, in a downward region, to a front end of said supporting chassis; and a control unit for connecting in series or individually or in parallel said at least two electric traction motors to an electric power supply, in order to drive said distribution shafts and to provide four wheel drive at incrementally higher speeds, depending on whether said control unit connects said at least two electric traction motors in series or individually or in parallel to said electric power supply.