F - Mech Eng,Light,Heat,Weapons – 04 – B
Patent
F - Mech Eng,Light,Heat,Weapons
04
B
103/154, 103/61
F04B 1/24 (2006.01) F04B 1/20 (2006.01) F04B 1/32 (2006.01)
Patent
CA 1036421
METHOD AND VALVE FACE CONFIGURATION FOR REDUCING NOISE IN A HYDRAULIC PUMP A B S T R A C T In order to reduce noise within a hydraulic pump of a type having a cylinder barrel defining a plurality of piston bores with the cylinder barrel being rotatable relative to a cylinder head having a valve face for periodically communica- ting the piston bores with inlet and outlet ports, the valve face is designed to provide overlapping alignment of each piston bore with the inlet passage at a bottom dead center position, subsequent communication of the bore with the outlet port being initiated by a bleed slot. Additionally, the valve face is configured for developing increased clamping engage- ment between the cylinder barrel and cylinder head by selective communication of each bore with the outlet and inlet ports at a top dead center position. The valve face configuration improves lubrication of the pistons.
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