Fluid handling – Self-proportioning or correlating systems – Self-controlled branched flow systems
Patent
1979-12-14
1981-10-13
Cohan, Alan
Fluid handling
Self-proportioning or correlating systems
Self-controlled branched flow systems
137118, 137494, F16K 1110
Patent
active
042942780
ABSTRACT:
A pressure modulating valve 28 has a principal use for retrofitting into an original hydraulic system (10) to modulate the fluid pressure from a source (11) of hydraulic fluid to hydraulic clutches (50, 52) in a transmission (54). In prior art valves, the routing of hydraulic fluid from the original system to the valve involved the connection of many lines. The present invention is connected to the source (11) at only one location and discharges fluid to the clutches from said location. The valve (28) is operated by the fluid provided at the one location without the need to route fluid around the valve (28) to the various components thereof. The valve (28) also modulates the fluid supplied to the clutches from a low pressure to a high pressure to provide smooth clutch engagement.
REFERENCES:
patent: 3137311 (1974-06-01), Rohweder
patent: 3468194 (1969-09-01), Horsch
patent: 3570522 (1971-03-01), Horsch
patent: 3739807 (1973-06-01), Landrus
patent: 3802460 (1974-04-01), Grosseau
patent: 3882980 (1975-05-01), Blake
patent: 3960172 (1976-06-01), Blake
patent: 3990553 (1976-11-01), Holzinger
patent: 4013093 (1977-03-01), Pensa
Caterpillar Tractor Co.
Cohan Alan
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