Patents by Inventor Aiki IWASA

Aiki IWASA has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Sliding spline shaft device
    Patent number: 11927225
    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.
    Type: Grant
    Filed: April 12, 2019
    Date of Patent: March 12, 2024
    Assignees: NISSAN MOTOR CO., LTD., NIHON PARKERIZING CO., LTD.
    Inventors: Shigetoshi Kashiwabara, Kunio Katada, Shunsuke Hiraiwa, Akihumi Kawaguchi, Takeo Nishijima, Shinichi Suzuki, Yasuyuki Katsumada, Makoto Nakajima, Tokunori Kodama, Masato Ito, Aiki Iwasa
  • SLIDING SPLINE SHAFT DEVICE
    Publication number: 20210199158
    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.
    Type: Application
    Filed: April 12, 2019
    Publication date: July 1, 2021
    Applicants: NISSAN MOTOR CO., LTD., NIHON PARKERIZING CO., LTD.
    Inventors: Shigetoshi KASHIWABARA, Kunio KATADA, Shunsuke HIRAIWA, Akihumi KAWAGUCHI, Takeo NISHIJIMA, Shinichi SUZUKI, Yasuyuki KATSUMADA, Makoto NAKAJIMA, Tokunori KODAMA, Masato ITO, Aiki IWASA