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:
Jan. 23, 2007
Filed:
Jul. 22, 2004
Kazuo Enzaka, Gunma-ken, JP;
Yasunori Ono, Gunma-ken, JP;
Masahiro Kasahara, Gunma-ken, JP;
Yoshiaki Senga, Gunma-ken, JP;
Ken Kaneko, Gunma-ken, JP;
Takahiro Sato, Gunma-ken, JP;
Kazuo Enzaka, Gunma-ken, JP;
Yasunori Ono, Gunma-ken, JP;
Masahiro Kasahara, Gunma-ken, JP;
Yoshiaki Senga, Gunma-ken, JP;
Ken Kaneko, Gunma-ken, JP;
Takahiro Sato, Gunma-ken, JP;
Honda Motor Co., Ltd., Tokyo, JP;
Yamada Manufacturing Co., Ltd., Gunma-ken, JP;
Abstract
It is an object of the present invention to provide a trochoid type oil pump in which erosion of the rotor surfaces caused by cavitation is minimized, vibration and noise are reduced, and the structure is greatly simplified. The trochoid type oil pump of the present invention comprises a rotor chamber which has an intake port and a discharge port, an outer rotor, an inner rotor, and shallow grooves which are formed on the side of the initial end portion of the discharge port on the circular circumference of the track of the positions of the bottom portions of the teeth created by the rotation of the outer rotor. In a state in which the sealed spaces formed by the outer rotor, the inner rotor and a partition part between the final end portion of the intake port and the initial end portion of the discharge port are reduced in volume from the maximum volume, the sealed spaces Sa are caused to communicate with the shallow grooves.