Rotary expansible chamber devices – Working chamber surface expressed mathematically
Reexamination Certificate
2006-10-10
2006-10-10
Trieu, Theresa (Department: 3748)
Rotary expansible chamber devices
Working chamber surface expressed mathematically
C418S171000
Reexamination Certificate
active
07118359
ABSTRACT:
An oil pump rotor assembly for an oil pump which enables reduction of noise while preventing pump performance and mechanical efficiency from being degraded. In this oil pump rotor assembly, the tooth tip profile of each of at least one of external teeth of an inner rotor and internal teeth of an outer rotor the inner rotor is formed such that a base cycloid curve is divided at a midpoint thereof to obtain two tooth curve segments, and the two tooth curve segments are separated by a predetermined distance along the circumference of a base circle or in the direction of a tangent of the base cycloid curve drawn at the midpoint thereof and are smoothly connected to each other using a curve or a straight line.
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English translation of JP05-256268 published on Oct. 5, 1993.
English Translation of DE 330 610 C published on Dec. 18, 1920.
Darby & Darby
Mitsubishi Materials Corporation
Trieu Theresa
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