Motors: expansible chamber type – With motive fluid valve – Plural separately controlled waste passages for single...
Patent
1974-09-03
1977-05-03
Cohen, Irwin C.
Motors: expansible chamber type
With motive fluid valve
Plural separately controlled waste passages for single...
91455, 91457, 13759613, 13762512, 13762548, F15B 1108, F15B 1304
Patent
active
040207480
ABSTRACT:
A valve piston in an automotive power-steering system has a pair of inner peripheral grooves, defined by confronting lands of adjoining piston heads, normally communicating with the high-pressure side of an oil pump via symmetrical branch channels and with the low-pressure side of that pump via a common return channel. The piston also has a pair of outer peripheral grooves, normally cut off from the adjoining inner grooves, connected to opposite cylinder chambers of a hydraulic servomotor. The inner grooves communicate with a pair of axial piston bores receiving fixed or spring-loaded plungers for exerting a counteracting hydraulic pressure upon the piston upon a displacement thereof from its centered position, such displacement also opening the path from one branch channel via the corresponding inner groove and the adjoining outer groove to a corresponding servomotor chamber. The lands bounding the inner grooves are so shaped that, upon any piston shift away from the centered position, a progressive throttling of the return path to the low-pressure side occurs at one inner groove substantially simultaneously with the establishment of a connection between the other inner groove and the adjoining outer groove, followed by a blocking of the return path from that other inner groove before complete cutoff of that connection.
REFERENCES:
patent: 2708909 (1955-05-01), Curlett
patent: 2949097 (1960-08-01), Vander Kaay
patent: 3012576 (1961-12-01), Williams
patent: 3198212 (1965-08-01), Junck et al.
patent: 3329170 (1967-07-01), Petersen
patent: 3391708 (1968-07-01), Rice
patent: 3403512 (1968-10-01), Malott
patent: 3553966 (1971-01-01), Liebert
patent: 3556155 (1971-01-01), McWilliams
Cohen Irwin C.
Dubno Herbert
Ross Karl F.
Zahnradfabrik Friedrichshafen AG
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