On-demand lubrication system for improved flow management and containment
AssigneeUnited Technologies Corporation
InventorsJorn A. Glahn, Denman H. James
Life of this patent
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Abstract
An oil circulation system for a gas turbine engine includes a variable displacement scavenge pump for pumping oil, a first actuator for controlling displacement of the scavenge pump, a variable displacement pressure pump for pumping oil, a second actuator for controlling displacement of the pressure pump, and a drive shaft. Both the scavenge pump and the pressure pump are driven by the drive shaft.
Claims19
An oil circulation system for a gas turbine engine, the system comprising:
- a variable displacement scavenge pump for pumping oil;
- a first actuator for controlling displacement of the scavenge pump;
- a variable displacement pressure pump for pumping oil;
- a second actuator for controlling displacement of the pressure pump;
- a drive shaft, wherein both the scavenge pump and the pressure pump are driven by the drive shaft;
- and
- a mechanical linkage operably connected between the scavenge pump and the pressure pump configured to make displacement of the scavenge pump at least as great as displacement of the pressure pump, wherein the linkage permits displacement of the scavenge pump to exceed displacement of the pressure pump.
An oil circulation system for a gas turbine engine, the system comprising:
- a compartment where oil is utilized;
- a pressure pump for pumping oil to the compartment;
- a scavenge pump for pumping oil out of the compartment, wherein a pumping rate of the scavenge pump is variable, wherein the pumping rate of the scavenge pump is selected as a function of engine operating speed, and wherein the pumping rate of the scavenge pump is greater than a pumping rate of the pressure pump.
An oil circulation system for a gas turbine engine, the system comprising:
- a tank;
- a compartment;
- a variable displacement scavenge pump for pumping oil from the compartment to the tank;
- a first actuator for controlling displacement of the scavenge pump;
- a variable displacement pressure pump for pumping oil from the tank to the compartment;
- a second actuator for controlling displacement of the pressure pump;
- a drive shaft, wherein both the scavenge pump and the pressure pump are commonly driven by the drive shaft;
- a mechanical linkage operably connected between the scavenge pump and the pressure pump configured to make displacement of the scavenge pump at least as great as displacement of the pressure pump, wherein the linkage permits displacement of the scavenge pump to exceed displacement of the pressure pump.
Dependencies are inferred from the claim text.