Patent ID: 7418819

Claim:
A pump unit used for a vehicle with first and second hydraulic motors each connected to right and left drive wheels of the vehicle comprising: a common housing disposed away from said first and second hydraulic motors; first and second variable displacement type hydraulic pumps accommodated within said common housing through an opening that is formed in said common housing, said opening being sealed by a center section; said center section forming a first pair of inlet/outlet passages that have first ends communicated with said first hydraulic pump and second ends opened to the outside of the center section to form connection ports, and a second pair of inlet/outlet passages that have first ends communicated with said second hydraulic pump and second ends opened to the outside of the center section to form connection ports, said connection ports of said first pair of inlet/outlet passages and said connection ports of said second pair of inlet/outlet passages being formed in the same side of the common center section; said first hydraulic pump and said second hydraulic pump each including a first pump shaft and a second pump shaft, both of which have rotating shaft centers substantially parallel to each other, and a first control shaft and a second control shaft designed for controlling the input/output flow rates of said first and second hydraulic pumps; and said first and second control shafts protruding outwardly from the same side of said common housing.