Pumps – Condition responsive control of pump drive motor – By controlling drive motor motive fluid
Patent
1976-11-02
1978-09-05
Freeh, William L.
Pumps
Condition responsive control of pump drive motor
By controlling drive motor motive fluid
417403, F04B 4900, F04B 4908
Patent
active
041116070
ABSTRACT:
A hydraulic motor comprising a cylinder, a stepped piston reciprocatable in said cylinder and having relatively proportioned leading and trailing surfaces, the surfaces together with axially directed surfaces defining, with the cylinder walls, first, second and intermediate cylinder zones, which intermediate cylinder zone is sealed with respect the first zone, valve controlled inlet and outlet of said cylinder in communication with said first zone, a water inlet of said cylinder in communication with the intermediate zone, piston wall portions defining a cylindrical recess opening out into the second zone and passages serving to effect communication between the recess and the second and intermediate zones, a tubular spool valve rod, apertured adjacent one end thereof and formed adjacent an opposite end thereof with a pair of axially spaced apart flanges fitting slidingly into the cylindrical recess, the rod having formed thereon an outwardly directed abutment located intermediate the flanges and the one end of the rod, the rod having relatively proportioned leading and trailing surfaces and being reciprocatable with respect to the piston between a first position wherein the second and intermediate zones communicate with each other and wherein there is defined between the opposite end of the rod and a wall of the recess, a region in communication with the interior of the spool valve rod and to which an end surface of said rod is exposed, and a second position wherein the second and intermediate zones are sealed with respect to each other; the rod extending sealingly and slidably through a cylinder wall and being displaceable with respect to the cylinder between a first location wherein the rod apertures communicate with the second zone and a second location wherein the abutment abuts the cylinder wall, the apertures communicating with the outside of the cylinder when the rod is in the second locations and in locations intermediate the first and second locations.
REFERENCES:
patent: 1965038 (1934-07-01), Hartman
patent: 2276783 (1942-03-01), Kennedy
patent: 2851013 (1958-09-01), Doughton
patent: 2966893 (1961-01-01), Deitrickson
patent: 2966894 (1961-01-01), Deitrickson
Amiad Systems Ltd.
Freeh William L.
Sandler Donald M.
LandOfFree
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