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:
Jul. 15, 2008
Filed:
Oct. 27, 2005
Takahiro Yamaguchi, Kariya, JP;
Takashi Satou, Kariya, JP;
Shigeki Torii, Kariya, JP;
Toshiya Hayashi, Yokkaichi, JP;
Akihiro Yada, Yokkaichi, JP;
Hitoshi Mizutani, Kuwana, JP;
Takuya Fukitsuke, Inabe, JP;
Kazunori Uchiyama, Okazaki, JP;
Naoki Hakamada, Anjo, JP;
Takahiro Yamaguchi, Kariya, JP;
Takashi Satou, Kariya, JP;
Shigeki Torii, Kariya, JP;
Toshiya Hayashi, Yokkaichi, JP;
Akihiro Yada, Yokkaichi, JP;
Hitoshi Mizutani, Kuwana, JP;
Takuya Fukitsuke, Inabe, JP;
Kazunori Uchiyama, Okazaki, JP;
Naoki Hakamada, Anjo, JP;
Abstract
The curvature of a circular arc constituted by a side of a suction groove is made larger than that of a circular arc constituted by a side of a discharge groove. Thus, when the suction groove and the discharge groove are viewed in the axial direction of a drive shaft, the distance between the suction groove and the discharge groove in the radial direction of a rotary portion is short in a region intersecting with a line W perpendicular to a centerline, and increases in accordance with a decrease in distance from containment portions. It is therefore possible to ensure a sufficient distance between the discharge and suction grooves and enhance a total fluid pressure generated therebetween, and the contact surface pressure that is necessitated by a second side plate to obtain a press-back force when being in contact with an outer rotor and an inner rotor is reduced.