Rotor for oil pump with different contours for the drive-side versus non-drive side of the teeth
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United States of America Patent
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May 26, 2015
Grant Date -
Dec 5, 2013
app pub date -
May 28, 2013
filing date -
Jun 1, 2012
priority date (Note) -
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Abstract
A rotor for an oil pump according to the present invention is a rotor that includes an inner rotor configured by teeth, each of which has a plurality of ellipses or circles, and an outer rotor that is disposed on the outside of the inner rotor and has one tooth more than the inner rotor, wherein, in a tooth of the inner rotor, a tooth top and a tooth root of a drive-side half-tooth region extending from the tooth top to the tooth root and a tooth top and a tooth root of a non-drive-side half-tooth region extending from the tooth top to the tooth root are each configured by a different ellipse or a circle. A circumferential axis along a circumferential direction of the ellipse or circle configuring the tooth top is longer in the non-drive-side half-tooth region than in the drive-side half-tooth region.
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