Fluid handling – Diverse fluid containing pressure systems – Fluid separating traps or vents
Patent
1987-08-10
1988-08-23
Cohan, Alan
Fluid handling
Diverse fluid containing pressure systems
Fluid separating traps or vents
137113, 137413, F16K 3134
Patent
active
047653574
ABSTRACT:
A scavenger system (10) for a hydraulic recirculating installation, such as may be employed with a vehicular transmission (11), which employs a sump (18) to collect the recirculating hydraulic fluid (19). The sump (18) is to be maintained essentially dry, and as a result the requisite volume of hydraulic fluid (19) for the recirculating installation is stored within an independent reservoir (28). The sump (18) is provided with one or more collecting wells (21), and a unique pickup head assembly (22) is received within each well (21). The pickup head assembly incorporates a pilot valve (60) that interacts with an inlet valve (55). The inlet valve (55) effects communication between the well 21 and a conduit means (29). The conduit means (29) communicates with the inlet port (30) of a circulating pump (25) from a fluid reservoir (28) as well as from the pickup head assembly (22). A float (99) senses the level of the fluid (19) within the well (21) and effects a corresponding reaction to the spool valve (60). The spool valve (60) interacts with the inlet valve (55) to control communication between the well (21) and the conduit means (29) in response to the level of the hydraulic fluid (19) within the well, as sensed by the float (99). The opening and closing of the inlet valve (55) in response to the pilot valve (60) thus serves to admit the flow of hydraulic fluid freely therethrough but to preclude the admission of air.
REFERENCES:
patent: 2293867 (1942-08-01), Temple
patent: 2436147 (1948-02-01), LeClair
patent: 2939476 (1960-06-01), Absolon
Cohan Alan
General Motors Corporation
Scherer Donald F.
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