The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Dec. 30, 2014
Filed:
Jan. 26, 2011
Masateru Nakagawa, Kariya, JP;
Nobukazu Ike, Kariya, JP;
Takuro Iwase, Anjo, JP;
Tomohiro Umemura, Aichi-ken, JP;
Noriyasu Ariga, Okazaki, JP;
Katsunori Ishikawa, Nishio, JP;
Masashi Narita, Toyota, JP;
Masateru Nakagawa, Kariya, JP;
Nobukazu Ike, Kariya, JP;
Takuro Iwase, Anjo, JP;
Tomohiro Umemura, Aichi-ken, JP;
Noriyasu Ariga, Okazaki, JP;
Katsunori Ishikawa, Nishio, JP;
Masashi Narita, Toyota, JP;
Aisin AW Co., Ltd., Aichi-ken, JP;
Toyooki Kogyo Co., Ltd., Aichi-ken, JP;
Abstract
An oil pump having an inner rotor with of external teeth; an outer rotor that is eccentrically provided and has internal teeth that mesh with the inner rotor external teeth, and an oil pump body that accommodates the outer and inner rotors. By rotationally driving the inner rotor to increase and decrease a space between the internal and the external teeth, an intake stroke suctions hydraulic oil from the oil pump body and a discharge stroke discharges the suctioned hydraulic oil to a discharge port formed in the oil pump body. Between the intake and discharge strokes, a confinement stroke cuts off the suctioned hydraulic oil and confines the suctioned hydraulic oil in the space, and a compression stroke reduces the space and compresses the confined hydraulic oil. Further, an interval is set between a finish end portion of the intake port of the oil pump body and a start end portion of the discharge port such that a rotation angle of the inner rotor during the compression stroke is 21 to 27 degrees.