US Patent 7281601 Fluid driven differential

A fluid driven differential, having a fluid filled housing, an input shaft, and a pair of output shafts. The input shaft is attached to an automobile driveshaft outside of the housing and to a propeller inside the housing. The output shafts are each attached to an axle and wheel outside the housing and to a turbine inside the housing. When the driveshaft rotates the input shaft, the propeller generates a fluid current that turns the turbines and thereby turns the output shafts, the axles, and the wheels. A pair of return conduits direct fluid from the vicinity of the turbines to the vicinity of the propeller.