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:
Nov. 05, 2002
Filed:
Oct. 24, 2000
Hydraulic circuit having a rotary type pump and brake apparatus for a vehicle provided with the same
Takahiro Yamaguchi, Kariya, JP;
Toshiya Morikawa, Kariya, JP;
Shuichi Yonemura, Anjo, JP;
Yoichi Abe, Kariya, JP;
Mamoru Sawada, Yokkaichi, JP;
Takashi Sato, Okazaki, JP;
Hideshi Mori, Chiryu, JP;
Takeshi Fuchida, Kariya, JP;
Denso Corporation, Kariya, JP;
Abstract
In the brake apparatus having a rotary pump, outer and inner rotors of the rotary pump are made of bearing steel and inner and outer teeth portions of the rotors are respectively processed by nitriding hardening or carbo-nitriding hardening. Accordingly, outer circumferential region of the outer teeth portion and inner circumferential region of the inner teeth are constituted by nitrided layer containing 15 to 40 percents retained austenite so that teeth faces of the outer and inner teeth portions in mesh may have higher wear resistance.