Oil pump rotor assembly
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United States of America Patent
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Sep 15, 2009
Grant Date -
Mar 22, 2007
app pub date -
Aug 25, 2004
filing date -
Sep 1, 2003
priority date (Note) -
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Abstract
An oil pump rotor assembly is disclosed. An inner rotor formed with n external teeth is based on cycloid curves which are generated by a first circumscribed-rolling circle and a first inscribed-rolling circle by rolling the first circumscribed-rolling circle and first inscribed-rolling circle along an inner base circle. An outer rotor formed with n+1 internal teeth (n+1 is the number of teeth) is based on cycloid curves which are generated by a second circumscribed-rolling circle and a second inscribed-rolling circle by rolling the second circumscribed-rolling circle and second inscribed-rolling circles along an outer base circle.
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