Is a
Patent attributes
Patent Jurisdiction
Patent Number
Patent Inventor Names
Katsuaki Hosono0
Date of Patent
January 13, 2009
0Patent Application Number
105567420
Date Filed
August 10, 2004
0Patent Primary Examiner
Patent abstract
A rotor pump assembly is disclosed which reduces noise emitted from an oil pump while preventing pumping performance and mechanical efficiency thereof from being decreased by properly forming the profiles of teeth of an inner rotor and an outer rotor which are engageable with each other. The tooth profile of an inner rotor and/or an outer rotor has curved lines obtained by dividing a cycloid curve into two segments to be separated from each other, and in which the separated segments are smoothly connected to each other using a straight line or a curve.
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