Patent ID: 7654083

Claim:
An axle driving apparatus for a vehicle, comprising: a first housing having a first plurality of cooling fins; a first axle, having a first longitudinal axis, rotatably mounted in the first housing; a first hydraulic stepless speed change assembly disposed within the first housing, the first hydraulic stepless speed change assembly including a first hydraulic pump having a first input shaft, said first input shaft having a rotational axis substantially perpendicular to said first axle, and including a first hydraulic motor having a first output shaft drivingly connected to said first axle; a second housing having a second plurality of cooling fins; a second axle, having a second longitudinal axis, rotatably mounted in the second housing; a second hydraulic stepless speed change assembly disposed within the second housing, the second hydraulic stepless speed change assembly including a second hydraulic pump having a second input shaft, said second input shaft having a rotational axis substantially perpendicular to said second axle, and including a second hydraulic motor having a second output shaft drivingly connected to said second axle; and a connecting means connecting the first and second housings; wherein the first plurality of cooling fins and the second plurality of cooling fins have different configurations.