Patent ID: 7695252

Claim:
A pump system comprising: a base unit including: a base housing with first and second end walls that face each other; an input part supported by the first and second end walls in a state capable of being operatively connected to a driving source through a through hole formed in the first end wall; and a plurality of output parts supported by the first and second end walls in a state of being capable of outputting power, which has been transmitted from the input part, through a plurality of access openings formed in the second end wall; the base unit capable of being mounted to a support member; and a pump unit including a plurality of pump shafts, a plurality of hydraulic pump bodies respectively driven by the plurality of pump shafts, a plurality of pump cases for respectively surrounding the plurality of hydraulic pump bodies while supporting the plurality of pump shafts, a plurality of output-adjusting members for adjusting suction/discharge rates of the corresponding hydraulic pump bodies, and a plurality of control shafts supported by the corresponding pump cases in a rotatable manner around its axis line so as to operate the corresponding output-adjusting members, the pump unit detachably connected to the base unit, wherein: each of the plurality of hydraulic pump bodies comprises a cylinder block and a piston unit; each of the plurality of pump cases includes an end wall detachably connected to the second end wall of the base housing, a peripheral wall extending from the end wall along the corresponding pump shaft in a direction apart from the base housing, and an opening provided on a side of the peripheral wall that is opposite to the end wall, the opening having a size that allows the corresponding hydraulic pump body to pass therethrough, the openings of the plurality of pump cases are closed by a single common port block, each of the plurality of pump cases is capable of being connected to the base housing and the common port block at a plurality of positions around the axis line of the corresponding pump shaft independently of the other of the plurality of pump cases, each of the plurality of output parts is formed by a hollow shaft that is accommodated in an inner space of the base housing in a state capable of being accessed from an outside of the base housing through a corresponding access opening, the end wall of the pump case and the second end wall of the base housing are brought into contact with each other so as to be in a concavo-convex engagement, and each of the plurality of pump shafts is inserted into the corresponding hollow shaft through the access opening so as to be relatively non-rotatable with respect thereto by means of causing the end wall of the pump case and the second end wall of the base housing to be in the concavo-convex engagement.