Hydraulic axial piston unit with multiple valve plates

Details Hydraulic axial piston unit with multiple valve plates Hydraulic axial piston unit with multiple valve plates

1995-01-13

1997-01-14

Thorpe, Timothy

Pumps

Three or more cylinders arranged in parallel, radial, or...

417312, 91499, F04B 120

Patent

active

055932851

ABSTRACT:
An axial piston hydraulic unit has a valve plate assembly positioned between a head and a rotatable cylinder barrel. The assembly includes a pair of valve plates stacked together to function as a single valve plate. The valve plate assembly defines a restricted flow path for providing initial communication between an approaching piston bore of the rotatable barrel and an intake port and a discharge port extending through the pair of plates. A first portion of the flow path is defined in the valve plate adjoining the head and a second portion of the flow path is defined in the valve plate adjacent the barrel. The stacked valve plates are hydraulically held together by a pair of pressure balancing devices.

REFERENCES:
patent: 3523678 (1970-08-01), Wright
patent: 3585901 (1971-06-01), Moon, Jr.
patent: 3699845 (1972-10-01), Ifield
patent: 3738228 (1973-06-01), Harrison
patent: 3890883 (1975-06-01), Rometsch et al.
patent: 4034652 (1977-07-01), Huebner
patent: 4550645 (1985-11-01), Beck, Jr.
patent: 4920856 (1990-05-01), Berthold et al.

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