초록 ▼

A lubrication scavenge system for an engine bearing compartment or the like utilizing a gear pump with two or more independent inlets with separate flow paths through the pump. The inlets and flow paths are maintained separate from each other by the use of inlet and discharge seal arcs to avoid any

A lubrication scavenge system for an engine bearing compartment or the like utilizing a gear pump with two or more independent inlets with separate flow paths through the pump. The inlets and flow paths are maintained separate from each other by the use of inlet and discharge seal arcs to avoid any fluid communication therebetween. The pump can operate to pump different fluids through each inlet with the fluid being either a gas or liquid or a mixture of both and with the pump continuing its pumping action when there is an instantaneous interchange in the fluid being pumped at each inlet as can occur when the engine bearing compartment is subjected to varying positive and negative gravity forces.

대표청구항 ▼

A dual inlet gear pump operable in either a pumping mode or a metering mode for scavenging fluid from a pair of compartment outlets and wherein the fluid at said compartment outlets may alternate between air or oil or a mixture thereof comprising, a pump housing having a pair of inlet ports for asso

A dual inlet gear pump operable in either a pumping mode or a metering mode for scavenging fluid from a pair of compartment outlets and wherein the fluid at said compartment outlets may alternate between air or oil or a mixture thereof comprising, a pump housing having a pair of inlet ports for association one with each of said compartment outlets and a single discharge port, a pair of separate fill slots in said housing communicating one with each of said inlet ports, said housing having a pair of generally cylindrical pump chambers, a pair of rotatable meshing gears in said pump chambers which separately rotate past an associated fill slot to carry fluid to the discharge port, portions of the walls of said pump chambers defining inlet and discharge seal arcs for each gear to preclude any direct fluid communication between the inlet ports and between the inlet ports and the discharge port, said inlet seal arcs extending between the leading edge of each fill slot and the intersection of said pump chambers and at least equal to the spacing between adjacent gear tooth tips and the discharge seal arcs being at least equal to the spacing between adjacent gear tooth tips and extending between the discharge port and the trailing edge of the fill slots, bearing means pressure loaded against the end faces of the gears, and a passage through said bearing means which communicates with only one of said inlet ports when the pump is used in a metering mode to provide said pressure loading without creating a flow path between the inlet ports.