Pumps – Condition responsive control of drive transmission or pump... – Adjustable cam or linkage
Patent
1979-10-04
1980-12-02
Freeh, William L.
Pumps
Condition responsive control of drive transmission or pump...
Adjustable cam or linkage
251 57, F04B 128, F16K 3112
Patent
active
042368758
ABSTRACT:
A pressure operated control valve operative to regulate the flow of fluid to a hydraulic modulating cylinder having a fixed hydraulic bleed which cylinder operates a mechanism for varying the displacement of a compressor of an automotive air conditioning system to maintain a predetermined control or system pressure. The system pressure continually surrounds a sealed bellows seated in the closed end of a tubular bellows cover. High pressure fluid is continually supplied to the control valve which has a ball and seat to totally restrict fluid flow to the modulating cylinder when the system pressure exceeds the setting pressure of the valve. When the system pressure drops below the setting pressure, the bellows extends against an axial pin which forces the ball from its seat, thus allowing high pressure fluid to flow to the compressor modulating cylinder operating the compressor mechanism and reducing the stroke of the compressor pistons. When the system pressure returns to the setting pressure, the bellows retracts moving the ball toward its seat thereby reducing hydraulic fluid flow to the modulating cylinder.
REFERENCES:
patent: 3062620 (1962-11-01), Heidorn
patent: 3372902 (1968-03-01), Gotzenberger
patent: 3525234 (1970-08-01), Widdowson
patent: 3637187 (1972-01-01), Burger
patent: 4037993 (1977-07-01), Roberts
patent: 4052035 (1977-10-01), Kenny et al.
patent: 4073603 (1978-02-01), Abendschein
Barthel Edward P.
Freeh William L.
General Motors Corporation
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