Pumps – With condition responsive pumped fluid control – Plural pump units with individual or relative control
Patent
1996-01-24
1998-07-07
Freay, Charles G.
Pumps
With condition responsive pumped fluid control
Plural pump units with individual or relative control
4171991, 417428, 417429, F04B 2308, F04B 2304
Patent
active
057758816
ABSTRACT:
The present invention relates to an oil supply system with at least one pressure and/or volume dependent controllable pump (1) and an oil tank (5) or the like from which the pump draws oil and delivers it with controlled output pressure or output volume to a system (8) to be supplied. In order to provide an oil supply system with the features described, which, using a single size of loss-free controllable pump tuned for supplying small to medium sized engine sizes, is also capable of supplying large capacity engines reliably and with optimum efficiency, and is furthermore capable of permanently supplying high performance engines when there is movement of the oil level and avoiding "dry running", it is proposed that according to the invention a constant displacement pump (2) is provided in addition to the controllable pump (1), wherein the controllable pump is configured so that in one and the same direction of revolution of its drive shaft (10), it can deliver or allow passage of the pump medium selectively in the normal pumping direction or in the opposite direction.
REFERENCES:
patent: 3415058 (1968-12-01), Underwood et al.
patent: 3526468 (1970-09-01), Moon et al.
patent: 3775025 (1973-11-01), Maher, Jr. et al.
patent: 3985472 (1976-10-01), Virtue et al.
patent: 4325215 (1982-04-01), Yamamoto
patent: 5165862 (1992-11-01), Lindblom
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