Mechanism and method for a high efficiency low noise hydraulic pump/motor

Number of patents in Portfolio can not be more than 2000

United States of America

PATENT NO 11306589
APP PUB NO 20210215044A1
SERIAL NO

17215569

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Abstract

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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.

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Patent Owner(s)

Patent OwnerAddress
VOLVO CONSTRUCTION EQUIPMENT AB631 85 ESKILSTUNA

International Classification(s)

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Inventor(s)

Inventor Name Address # of filed Patents Total Citations
Ericson, Liselott Linköping, SE 3 4
Forssell, Jonas Torslanda, SE 36 109
Hedebjörn, Anders Gothenburg, SE 2 4
Palmberg, Jan-Ove Linköping, SE 6 23
Tonnqvist, Andreas Askim, SE 5 42

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