Toothed rotor set
AssigneeGKN Sinter Metals, LLC
InventorsJosef Bachmann, Harald Neubert, Eberhard Ernst
Life of this patent
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Abstract
The invention relates to a toothed rotor set for a pump, especially for a lubricating oil pump for internal combustion engines, wherein the toothed rotor set has a toothed configuration similar to a toothed ring pump and functioning and operation of said toothed rotor set corresponds to that of a toothed ring pump.
Claims13
A toothed rotor set, comprising (i) a rotatable ring bearing having a pocket formed therein, (ii) a pivotable planet rotor disposed in the pocket and having an inner gearing formed thereon, the inner gearing comprising a first plurality of gear teeth and (iii) an inner rotor mounted eccentrically with respect to the ring bearing and having a contoured outer surface, the outer surface being substantially star-shaped and having an outer gearing formed thereon, the outer gearing comprising a second plurality of gear teeth, wherein the second plurality of gear teeth is one less in number than the first plurality of gear teeth and at least one of the first and second pluralities of gear teeth have an arched portion being substantially shaped as a cycloid.
. The toothed rotor set according claim 1, wherein the inner rotor is constructed in accordance with the following formulae:
- a divided circle 2 (t2)=a rolling circle of an inner rotor curve (coarse gearing);
- a division t=a periphery (inner rotor curve)/a total number of the second plurality of gear teeth;
- a gear tooth thickness d=(the divided circle 2 (t2)−2* a flank play) a gear tooth gap 1=(the divided circle 2 (t2)+2* the flank play) a rolling circle 5 (r5)=(the divided circle 2 (t2)+2* the flank play)/πa rolling circle 6 (r6)=(the divided circle 2 (t2)−2* the flank play)/π
Dependencies are inferred from the claim text.