Pumps – With condition responsive pumped fluid control – Inlet throttle or stop valve
Patent
1987-11-09
1989-07-25
Freeh, William L.
Pumps
With condition responsive pumped fluid control
Inlet throttle or stop valve
417310, 184 63, 184 74, F04B 4902
Patent
active
048508144
ABSTRACT:
A hydraulic gear pump for the oil lubrication system of an automobile engine is disclosed, and wherein the meshing teeth of the gears define fluid cells which are expanded in the intake portion and receive the fluid from an inlet, and then compressed in the discharge portion to expel the fluid. The inlet to the pump includes at least two parallel fluid lines which are each connected to a tank. A pressure controlled valve is connected to one or both of the fluid lines, and during the normal operating range of output pressure, the valve is controlled by the pressure in the pump discharge chamber so as to decrease the flow through the lines from a maximum flow rate to a lower flow rate as the output pressure increases. In the event the engine and oil are cold, the output pressure will increase beyond the normal operating range, since the oil consumption is small. To heat this oil, the valve also includes means for throttling a portion of the output of the pump when the output pressure reaches a predetermined relatively high relief pressure which is greater than the normal operating pressure, and this throttling serves to rapidly increase the temperature of the oil. Also, the inlet fluid lines are designed to provide a flow rate during such throttling which is at least about 30% of the maximum flow rate during normal operation, to thereby assure sufficient flow for the throttling function.
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Hertell Siegfried
Otto Dieter
Barmag AG
Freeh William L.
LandOfFree
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