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AssigneeVolvo Construction Equipment AB
InventorsAndreas Tonnqvist, Jonas Forssell, Jan-Ove Palmberg, Liselott Ericson, Anders Hedebjörn
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A rotary displacement piston pump is disclosed having rotatable single or dual valve/port plate(s). The valve plate, being rotatable forward and/or rearward with respect to the rotation of the piston carrier, alters the phasing of the land area of the pumping action thereby altering the phasing of piston speed inasmuch as the land area can be moved to a position to accelerate the piston(s) in a pre or decompression phase. In this way, pump noise, from colliding pressure fronts within the respective high and low pressure plenums, can be “tuned” out of the pump by adjusting the phasing and position of the valve plate(s) and raising or lowering the pre and decompression pressure(s) as necessary. Pump volume can also be controlled by advancing or retarding the valve plate(s), either in or out of synch, so as to shorten intake/exhaust piston stroke and overlap fluid flow between respective intake/exhaust plenums.
A hydraulic pump, comprising:
A method of controlling noise in a hydraulic pump, the hydraulic pump including a rotating piston carrier mounted within a pump casing, the rotating piston carrier including piston chambers with hollow pistons therein, one of the hollow pistons being driven into and out of a pressure chamber in the piston carrier in a reciprocating fashion in response to rotation of the rotating piston carrier by an axially tilted valve plate positioned adjacent the rotating piston carrier, the method comprising:
A hydraulic pump, comprising:
Dependencies are inferred from the claim text.