Hydraulic radial piston machines

Details Hydraulic radial piston machines Hydraulic radial piston machines

1994-02-02

1996-01-09

Bertsch, Richard A.

Pumps

Condition responsive control of drive transmission or pump...

Adjustable cam or linkage

417273, 91497, F04B 2704

Patent

active

054824427

ABSTRACT:
A radial piston hydrostatic machine contained within a housing and comprising a cylinder-barrel mounted to rotate on a pintle-valve fixed to said housing. Two hydraulic-rams operatively acting on a track-ring to provide eccentric displacement relative to the pintle-valve to change the rate of fluid output from the machine. The hydraulic-rams being of unequal size and subjected to the same level of machine discharge pressure during periods when the level of discharge pressure is insufficient to cause an internally disposed pressure relief-valve to "open". A throttle-valve disposed in a fluid channel linking the cylinders of said hydraulic-rams and arranged to introduce a pressure differential across two said two cylinders during periods when the machine discharge pressure is sufficiently high to cause said pressure-relief-valve to "open".

REFERENCES:
patent: 1721225 (1929-07-01), Levering
patent: 2453538 (1949-11-01), Rauch
patent: 2741993 (1956-04-01), Orshawsky
patent: 2827859 (1958-03-01), Crane
patent: 3756749 (1973-07-01), Aldinger
patent: 3955477 (1976-05-01), Rutz
patent: 4056042 (1977-11-01), Rutz et al.
patent: 4686829 (1987-08-01), Thoma et al.
patent: 4920859 (1990-05-01), Smart et al.
patent: 5228290 (1993-07-01), Speggiorin

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