Rotor for oil pump with different contours for the drive-side versus non-drive side of the teeth

Number of patents in Portfolio can not be more than 2000

United States of America Patent

PATENT NO 9039397
APP PUB NO 20130323106A1
SERIAL NO

13903877

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Abstract

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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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Patent Owner(s)

Patent OwnerAddress
YAMADA MANUFACTURING CO LTD2757 HIROSAWA-CHO 1-CHOME KIRYU-SHI GUNMA 376-8585

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Inventor(s)

Inventor Name Address # of filed Patents Total Citations
Fujiki, Kenichi Isesaki, JP 28 261
Izutsu, Masato Isesaki, JP 16 12
Watanabe, Takatoshi Isesaki, JP 46 97

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