Patent ID: 7422077

Claim:
A hydraulic pump for driving travel motion, adapted to receive engine power and supply hydraulic pressure generated therein to a hydraulic motor drivingly connected to traveling wheels, the pump comprising: a housing having an opening in at least one side; an input shaft that is supported by the housing to receive the engine power; a cylinder block incorporated in the housing from the opening and drivingly connected to the input shaft; a center section that rotatably mounts the cylinder block, the center section having an oil channel for conveying oil supplied or discharged from the cylinder block to the hydraulic motor, and being fitted in the opening of the housing for closing the opening and forming a reservoir for lubricating oil; a piston fitted in the cylinder block so as to be slidable in the axial direction; a movable swash plate supported by the housing so as to enable changing of the stroke of the piston by coming into contact with the end of the piston and rotating in an inclined position; a first gear fixed so as to rotate integrally with the input shaft in the housing; and a power take-off (PTO) shaft that is supported by the housing and is capable of taking off the engine power out of the housing; the PTO shaft having thereon: a second gear freely fitted so as to receive power from the first gear; and a clutch that is capable of connecting and disconnecting the second gear from the PTO shaft.