Hydraulic pump or motor

Details Hydraulic pump or motor Hydraulic pump or motor

1974-01-23

1976-06-01

Maslousky, Paul E.

Expansible chamber devices

With lubricating means

Piston has lubricant retaining or conducting means

91488, F01B 3110

Patent

active

039600572

ABSTRACT:
A hydraulic pump or motor having: oil grooves in the internal partial-spherical surface of a piston for introducing pressure oil between said internal partial-spherical surface and a ball; oil grooves in the peripheral surface of the large diameter portion of said piston for introducing pressure oil between the outer peripheral surface of the large diameter portion of said piston and a cylinder; small diameter passages provided through said piston and extending from the upper end of said piston to said oil grooves, while communicating with an oil chamber for said piston; and necked or throttle portions provided in said small diameter passages, respectively, to thereby give rise to pressure drops for oil which is passing through said small diameter passages.

REFERENCES:
patent: 2862455 (1958-12-01), Ferris
patent: 3106138 (1963-10-01), Thoma
patent: 3153987 (1964-10-01), Thoma
patent: 3168013 (1965-02-01), Williamson
patent: 3366017 (1968-01-01), Firth et al.
patent: 3741077 (1973-06-01), Hulsebus
patent: 3858487 (1975-01-01), Abe

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