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:
Mar. 12, 2024
Filed:
Apr. 12, 2019
Nissan Motor Co., Ltd., Yokohama, JP;
Nihon Parkerizing Co., Ltd., Tokyo, JP;
Shigetoshi Kashiwabara, Kanagawa, JP;
Kunio Katada, Kanagawa, JP;
Shunsuke Hiraiwa, Kanagawa, JP;
Akihumi Kawaguchi, Kanagawa, JP;
Takeo Nishijima, Kanagawa, JP;
Shinichi Suzuki, Kanagawa, JP;
Yasuyuki Katsumada, Kanagawa, JP;
Makoto Nakajima, Kanagawa, JP;
Tokunori Kodama, Kanagawa, JP;
Masato Ito, Kanagawa, JP;
Aiki Iwasa, Kanagawa, JP;
NISSAN MOTOR CO., LTD., Yokohama, JP;
NIHON PARKERIZING CO., LTD., Tokyo, JP;
Abstract
A sliding spline shaft device of the present invention includes a male spline and a female spline that is fitted to the male spline in an axially slidable manner, and at least one of the splines has a surface processed layer. The surface processed layer includes an undercoat layer, an intermediate layer containing phosphate, and a topcoat layer containing solid lubricant, in this order. The undercoat layer contains iron nitride and/or iron carbide. Thus, the surface of a base material has high hardness. As a result, microscopic deformation of the sliding surface is reduced, and increase in a real contact area is suppressed, whereby stick-slip is prevented.