Crescent Gear Pump with Novel Rotor Set
AssigneeMAGNA Powertrain AG & Co KG
InventorsVasilios B. Liavas, Michal Nemec
Life of this patent
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Abstract
A novel crescent gear pump and pump rotor set for a crescent gear pump. The rotor set includes an outer rotor with teeth having a composite profile formed over the portion adjacent their root to conform to a circular arc and formed over the portion adjacent their tip to conform to a hypocycloid arc. The unique shape allows for increased volumetric capacity of the rotor set, when compared to trochoidal rotor sets of the same size. Further, operating noise is reduced, as are pulsations in the output of the pump when compared to the same pump with a trochoidal rotor set.
Claims14
A crescent gear pump, comprising:
- a housing defining a rotor chamber, the housing including a working fluid inlet and a working fluid outlet, each in fluid communication with a portion of the rotor chamber;
- a rotor set rotatable within the rotor chamber, the rotor set comprising:
- an outer rotor having a first number of inwardly extending teeth;
- an inner rotor having a second number of outwardly extending teeth, the second number being at least two less than the first number, the teeth of the inner rotor having a conjugate composite profile of the teeth of the outer rotor;
- and
- a crescent inserted between the inner and outer rotors of the rotor set and providing a sealing surface between the teeth thereof to separate the working fluid inlet and working fluid outlet in the rotor chamber, wherein each of said outer rotor teeth has a composite profile which includes a portion adjacent a root of the tooth formed to conform to a circular arc and a portion adjacent a tip of the tooth to conform to a hypocycloid arc.
A rotor set for a crescent gear pump, the rotor set comprising:
- an outer rotor having a first number of inwardly extending teeth, each outer rotor tooth having a composite profile which includes a portion adjacent the root of the tooth formed to conform to a circular arc and a portion adjacent the tip of the tooth to conform to a hypocycloid arc;
- and
- an inner rotor having a second number of outwardly extending teeth, the second number being at least two less than the first number, the teeth of the inner rotor having a conjugate composite profile to the teeth of the outer rotor.
Dependencies are inferred from the claim text.