Patents by Inventor Masashi YAMAGOU

Masashi YAMAGOU 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).

  • FLUID DYNAMIC BEARING, FLUID DYNAMIC BEARING DEVICE, AND MOTOR
    Publication number: 20230400056
    Abstract: A fluid dynamic bearing (bearing sleeve 8) includes a first dynamic pressure generating part 11 and a second dynamic pressure generating part 12 that are provided in an inner peripheral surface 8a so as to be spaced apart from each other in an axial direction. The respective dynamic pressure generating parts 11 and 12 have a plurality of dynamic pressure generating grooves 11a, 11b, 12a, and 12b arranged in a herringbone shape and having different tilt directions. The first dynamic pressure generating part 11 has an annular hill part 11c between the axial directions of the plurality of dynamic pressure generating grooves 11a and 11b having different tilt directions. The plurality of dynamic pressure generating grooves 12a and 12b, having different tilt directions, of the second dynamic pressure generating part 12 are continuous in the axial direction.
    Type: Application
    Filed: September 1, 2021
    Publication date: December 14, 2023
    Inventor: Masashi YAMAGOU
  • Shaft member for fluid bearing device, manufacturing method therefor, and fluid bearing device
    Patent number: 10837486
    Abstract: A shaft member for a fluid bearing device includes, on an outer peripheral surface thereof, two bearing surfaces (31 and 32) separated from each other in an axial direction, and a middle relief portion (33) formed between the bearing surfaces (31 and 32) and having a diameter smaller than a diameter of the bearing surfaces. The middle relief portion (33) includes a cylindrical surface portion (331) having a ground surface, and stepped portions (332) arranged on both axial sides of the cylindrical surface portion and having a diameter difference from the cylindrical surface portion.
    Type: Grant
    Filed: August 31, 2017
    Date of Patent: November 17, 2020
    Assignee: NTN CORPORATION
    Inventors: Jun Hirade, Masashi Yamagou, Mikihisa Fujiwara, Tetsuya Kurimura
  • SHAFT MEMBER FOR FLUID BEARING DEVICE, MANUFACTURING METHOD THEREFOR, AND FLUID BEARING DEVICE
    Publication number: 20200016650
    Abstract: A shaft member for a fluid bearing device includes, on an outer peripheral surface thereof, two bearing surfaces (31 and 32) separated from each other in an axial direction, and a middle relief portion (33) formed between the bearing surfaces (31 and 32) and having a diameter smaller than a diameter of the bearing surfaces. The middle relief portion (33) includes a cylindrical surface portion (331) having a ground surface, and stepped portions (332) arranged on both axial sides of the cylindrical surface portion and having a diameter difference from the cylindrical surface portion.
    Type: Application
    Filed: August 31, 2017
    Publication date: January 16, 2020
    Inventors: Jun HIRADE, Masashi YAMAGOU, Mikihisa FUJIWARA, Tetsuya KURIMURA