An axial piston pump has a rotor, which is rotatable around an axis relative to a swashplate. The pump further has one or more pistons movable within one or more respective sleeves. The piston(s) and sleeve(s) are carried by the rotor and the piston(s) are engaged with the swashplate such that rotation of the rotor relative to the swashplate reciprocates the piston(s) in the sleeve(s) for the pressurisation of fluid received into and discharged from the sleeve(s). The pump further has a fluid inlet port for the inflow of low pressure fluid, and a fluid outlet port for the outflow of high pressure fluid. The pump further has a floating element axially positioned between, on the one side, the inlet and outlet ports and, on the other side, a sealing surface of the rotor. The floating element is axially slidable, and at least partially defines an inlet chamber and an outlet chamber of the pump. The inlet chamber fluidly connects the inlet port to the or each sleeve when that sleeve is rotated by the rotor to a position to receive low pressure fluid, and the outlet chamber fluidly connects the outlet port to the or each sleeve when that sleeve is rotated by the rotor to a position to discharge high pressure fluid. Surfaces of the floating element defining the inlet chamber and the outlet chamber are configured such that, in use, the low pressure fluid and the high pressure fluid act on the defining surfaces to produce a net axial force which the axially slidable floating element applies to the rotor to seal the floating element to the sealing surface of the rotor.
Axial piston pump/motor
2016-07-13
Patent
Electronic Resource
English
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