Patent ID: 7185577

Claim:
A pump unit for supplying oil to first and second hydraulic motors respectively connected to left and right drive wheels, comprising: a first hydraulic pump which includes a fist pump shaft operatively connected to a power source and which is fluidly connected to said first hydraulic motor through a first closed circuit; a second hydraulic pump which includes a second pump shaft operatively connected to said first pump shaft and which is fluidly connected to said second hydraulic motor through a second closed circuit; a housing for accommodating said first and second hydraulic pumps; and a common charge pump which is driven by said second pump shaft and which supplies pressure oil to both said first and second closed circuit; wherein a first end of said first pump shaft extends outward from said housing, said first end of said first pump shaft supports a pulley, a first end of said second pump shaft extends outward from said charge pump, and said first end of said second pump shaft supports a cooling fan.