Random error generation of tooth index to eliminate pump noise
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United States of America Patent
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Dec 26, 2000
Grant Date -
N/A
app pub date -
Mar 21, 1999
filing date -
Mar 21, 1999
priority date (Note) -
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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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