Radial pistion pump or motor having improved porting

Details Radial pistion pump or motor having improved porting Radial pistion pump or motor having improved porting

1977-12-08

1979-07-24

Freeh, William L.

Motors: expansible chamber type

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

Radially disposed cylinders

F01B 1306

Patent

active

041619064

ABSTRACT:
The efficiency of a radial piston hydraulic pump or motor is improved by making the ports in the block through which the hydraulic fluid flows from and back to the charge and discharge areas, respectively, of the pintle shaft asymmetrical about their centerlines in the axial direction, the area of the part of each port which lies on the side of the axial centerline remote from the supply and return passages in the pintle shaft being substantially greater than the area of the remaining part of the port. Similarly, the ports in the pintle shaft which communicate the charge and discharge areas to the ports in the block have greater areas in the portions thereof on the side of the axial centerline remote from the supply and return passages than in the portions on the side of the axial centerline nearer the supply and return passages. In addition the juncture between the bridge portion of the pintle shaft and the end wall which faces the supply and return passages is smoothly concavely curved, and the edge of each of the charge and discharge ports of the pintle shaft that is adjacent the supply and return passages is bevelled inwardly and axially in the direction from the circumferential outer surface toward the supply and return passages.

REFERENCES:
patent: 1696139 (1928-12-01), Ferris
patent: 2823619 (1958-02-01), May
patent: 3961562 (1976-06-01), Rorsten

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