Patent ID: 7520131
Filing Date: 2009-04-21
Classification: F04B

Abstract:
1. A pump unit comprising: first and second hydraulic pump bodies disposed in parallel to each other; first and second pump shafts respectively supporting the first and second hydraulic pump bodies in a relatively non-rotatable manner and disposed in parallel to each other; and a pump housing accommodating the first and second pump bodies and supporting the plurality of pump shafts in a rotatable manner around respective axis lines, wherein the first pump shaft has first and second ends respectively positioned on one side and the other side in the axis line direction, the second pump shaft has first and second ends respectively positioned on the same sides as the first and second ends of the first pump shaft in the axis line direction, the pump housing includes a common pump case with an opening through which the first and second hydraulic pump bodies can be inserted, and a port block detachably connected to the common pump case so as to close the opening, the common pump case has a peripheral wall extending along the axis line direction of the first and second pump shafts and an end wall closing one side of the peripheral wall in the axis line direction so as to face the port block with the first and second hydraulic pump bodies sandwiched therebetween, the first ends of the first and second pump shafts extend outward from the same wall of the pump housing so as to form respective input ends, the pump unit further comprises first and second input pulleys respectively supported by the input ends of the first and second pump shafts in a relatively non-rotatable manner, and the first and second pulleys are displaced from each other with respect to the axis line direction of the first and second pump shafts.