Random error generation of tooth index to eliminate pump noise

Details Random error generation of tooth index to eliminate pump noise Random error generation of tooth index to eliminate pump noise

1999-03-21

2000-12-26

Vrablik, John J.

Rotary expansible chamber devices

Moving cylinder

Rotating

4182065, F04C 210, F04C 220

Patent

active

061649449

ABSTRACT:
A pump gear for an automatic transmission oil pump having a plurality of teeth. The thickness of each tooth varies randomly from a baseline thickness T.sub.B. Correspondingly, the clearance between each tooth varies randomly between each pair of adjacent teeth. The random variation in tooth thickness prevents the formation of resonant frequencies when the gear pump operates, thereby reducing noise produced by the automatic transmission oil pump.

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