Patent ID: 7334404
Filing Date: 2008-02-26
Classification: F04B,F16H

Abstract:
1. A pump unit comprising: a housing which has an oil-storable inner space, the oil-storable inner space being divided into a pump accommodating chamber and a gear accommodating chamber by a partition wall; a first and a second pump shafts supported by the housing so as to cross over the gear accommodating chamber and the pump accommodating chamber in the condition parallel to each other; a first and a second hydraulic pump main bodies supported by the first and the second pump shafts, respectively, in such a manner to be located in the pump accommodating chamber; a first and a second trunnion type movable swash plates that respectively vary the suction/discharge amount of the first and the second hydraulic pump main bodies, the first and the second trunnion type movable swash plates being supported by the housing in such a manner to be operatable from the outside; and a first and a second transmission gears respectively supported by the first and the second pump shafts in a relatively non-rotatable manner so as to be located in the gear accommodating chamber, wherein the housing has an inlet port for introducing oil from the outside into the pump accommodating chamber, an oil passage for communicating between the pump accommodating chamber and the gear accommodating chamber, and a discharge port for taking out oil from the gear accommodating chamber to the outside; the pump accommodating chamber includes a supporting wall that supports each base end of the first and the second trunnion type movable swash plates so that each operational end of the first and the second trunnion type movable swash plates is directed to the opposite directions to each other; the inlet port and the oil passage are respectively provided at one side and the other side of the pump accommodating chamber with the supporting wall as a reference, so that oil introduced from the outside into the housing is flown from the one side of the pump accommodating chamber to the gear accommodating chamber via the other side of the pump accommodating chamber, and then is discharged to the outside from the gear accommodating chamber.