Title:
オイルポンプロータ
Document Type and Number:
Japanese Patent JP4485770
Kind Code:
B2
Abstract:
There is disclosed an oil pump rotor assembly that prevents noise from being generated even when the hydraulic pressure generated in an oil pump rotor assembly is extremely small and the torque that drives the oil pump rotor assembly changes. An inner rotor 10 formed with "n" external teeth is based on cycloid curves which are generated by a first circumscribed-rolling circle Di and a first inscribed-rolling circle di by rolling the first circumscribed-rolling circle and first inscribed-rolling circle along a base circle bi. An outer rotor 20 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 Do and a second inscribed-rolling circle do by rolling the second circumscribed-rolling circle and second inscribed-rolling circles along a base circle bo. When the inner and outer rotors are formed, they are constructed to satisfy the following relations: Õbi=n· (ÕDi+Õdi); Õbo=(n+1) · (ÕDo+Õdo); ÕDi+Õdi=2e or ÕDo+Õdo=2e; ÕDo>ÕDi; Õdi>Õdo; and (ÕDi+Õdi)<ÕDo+Õdo), where Õbi, ÕDi, Õdi, Õbo, ÕDo, and Õdo are the diameters of the respective circles.
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Inventors:
Katsuaki Hosono
Application Number:
JP2003309348A
Publication Date:
June 23, 2010
Filing Date:
September 01, 2003
Export Citation:
Assignee:
Diamet Co., Ltd.
International Classes:
F04C2/10; F04C2/08; F04C15/00; F04C
Domestic Patent References:
| JP11264381A |
Foreign References:
| WO1999011935A1 |
Attorney, Agent or Firm:
Masatake Shiga
Tadashi Takahashi
Masakazu Aoyama
Yasuhiko Murayama
Noriko Yanai
Tadashi Takahashi
Masakazu Aoyama
Yasuhiko Murayama
Noriko Yanai