Axial piston hydraulic pumps or motors with improved valving

Motors: expansible chamber type – Three or more cylinders arranged in parallel radial or... – Cylinders parallel to rotation axis

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F01B 1304

Patent

active

042156246

ABSTRACT:
The conventional slotted valve plate of an axial piston pump-motor is replaced by an integral or separate barrel extension having a charge-discharge passageway leading to each cylinder. The passageways lead axially from the cylinders and then turn generally radially inward to open at ports in a circular-cylindrical bore in the extension which is coaxial with the barrel and main shaft axis. The end of a fixed pintle shaft extends into the bore. The pintle shaft has fluid supply and return passages that open to charge and discharge areas within the bore which, in turn, communicate through ports in the shaft with the ports in the barrel. The charge and discharge areas are divided by a diametrical wall, and bridges at the edges of the wall and between the pintle shaft ports serve as valves which sequentially close each barrel port and thereby separate the charge and discharge stages of operation of each cylinder.

REFERENCES:
patent: 1822064 (1931-09-01), Sorensen
patent: 2169456 (1939-08-01), Wahlmark
patent: 3279390 (1966-10-01), Horlacher
patent: 3548719 (1970-12-01), Tobias

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