Patents by Inventor Susumu YAMAJI

Susumu YAMAJI 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).

  • Axle bearing, grease composition and rolling ball bearing
    Patent number: 12085128
    Abstract: To provide an axle bearing having a low torque property and superior bearing lifetime. A hub bearing 6 is configured to rotatably support a wheel of a vehicle, and has a grease composition 10 sealed in an inner space thereof. The grease composition 10 contains a base oil and a thickener. The shear stress of the grease composition at the shear rate of 1,000-10,000 s?1 at 25° C. is 3,000 Pa or less. The viscosity of the grease composition is 1 Pas or less. The yield stress of the grease composition at 25° C. measured by a dynamic viscoelasticity analysis method using a rheometer is 1,300-3,000 Pa.
    Type: Grant
    Filed: October 8, 2020
    Date of Patent: September 10, 2024
    Assignee: NTN CORPORATION
    Inventors: Takayuki Kawamura, Ryouta Kondou, Makoto Seki, Susumu Yamaji
  • AXLE BEARING, GREASE COMPOSITION AND ROLLING BALL BEARING
    Publication number: 20240084853
    Abstract: To provide an axle bearing having a low torque property and superior bearing lifetime. A hub bearing 6 is configured to rotatably support a wheel of a vehicle, and has a grease composition 10 sealed in an inner space thereof. The grease composition 10 contains a base oil and a thickener. The shear stress of the grease composition at the shear rate of 1,000-10,000 s?1 at 25° C. is 3,000 Pa or less. The viscosity of the grease composition is 1 Pas or less. The yield stress of the grease composition at 25° C. measured by a dynamic viscoelasticity analysis method using a rheometer is 1,300-3,000 Pa.
    Type: Application
    Filed: October 8, 2020
    Publication date: March 14, 2024
    Inventors: Takayuki KAWAMURA, Ryouta KONDOU, Makoto SEKI, Susumu YAMAJI