Nissan Motor Company Limited

Nihon Parkerizing Co., Ltd.

Yasuyuki Katsumada

Makoto Nakajima

Shinichi Suzuki

Takeo Nishijima

Kunio Katada

Masato Ito

Shunsuke Hiraiwa

Akihumi Kawaguchi

Tokunori Kodama

Aiki Iwasa

Shigetoshi Kashiwabara

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.

Sliding spline shaft device

Growing community of inventors

Kanagawa, Japan

Yasuyuki Katsumada