Pumps – Condition responsive control of drive transmission or pump... – Adjustable cam or linkage
Patent
1994-10-17
1996-09-10
Korytnyk, Peter
Pumps
Condition responsive control of drive transmission or pump...
Adjustable cam or linkage
91504, F04B 130
Patent
active
055540074
ABSTRACT:
A variable displacement axial piston hydraulic unit includes first and second control pockets individually disposed between first and second arcuate shaped fluid passages, a first electrohydraulic valve for controlling fluid flow between the first control pocket and the first fluid passage and a second electrohydraulic valve for controlling fluid flow between the second passage and the second control pocket. A controller outputs first and second control signals to the first and second electrohydraulic valves in response to receiving a command signal so that the tilt angle of a swashplate is controlled to obtain a desired operating parameter. An angle detector, a pressure detector, and a speed detector provide feedback signals to the controller for determining when the desired operating parameter has been obtained.
REFERENCES:
patent: 3157130 (1964-11-01), Cadiou
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patent: 3200761 (1965-08-01), Firth et al.
patent: 3382813 (1968-05-01), Schauer
patent: 3585901 (1971-06-01), Moon, Jr.
patent: 3727521 (1973-04-01), Reynolds
patent: 3956969 (1976-05-01), Hein
patent: 4518320 (1985-05-01), Goodell
patent: 4918918 (1990-04-01), Miki et al.
Caterpillar Inc.
Grant John W.
Korytnyk Peter
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