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US 7,922,468 B2Granted
Gear pump with improved inlet port
AssigneeMAGNA Powertrain AG & Co KG
InventorPeter Lit Ming Chang
Life of this patent
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Abstract
A gear pump is provided and includes an inlet port which terminates, in the pumping direction of the rotor set, in a radially inwardly extending ramp portion. The ramp portion operates to direct working fluid from an inlet radially inwardly into a pumping chamber of the rotor set which is passing over the ramp portion. By closing the pumping chamber at a radially inwardly point, the filling efficiency of the pumping chamber is improved, reducing cavitation and/or operating noise of the pump.
Claims17
A gear pump for a working fluid comprising:
- a pump housing defining a rotor chamber and a pump inlet and a pump outlet;
- a rotor set in the rotor chamber and rotatable in a pumping direction, the rotor set comprising an inner rotor and an outer rotor, the inner and outer rotors each having teeth that move in and out of meshing engagement as the rotor set rotates forming a series of successive pumping chambers between the rotor teeth, each pumping chamber having a volume that increases as the teeth move out of meshing engagement and decreases as the teeth move into meshing engagement;
- an outlet port in fluid communication between the pump outlet and the pumping chambers as the volume of the pumping chambers decreases;
- and
- an inlet port in fluid communication between the pump inlet and the pumping chambers as the volume of the pumping chambers increases, the inlet port terminating in the pumping direction with a radially inwardly extending ramp portion, the ramp portion operating to close each successive pump chamber at a radially inner portion.
2 more elements
Dependencies are inferred from the claim text.