Patents by Inventor Katsuhisa Yokozuka

Katsuhisa Yokozuka 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).

  • Vacuum pump, rotor, and washer
    Patent number: 11946482
    Abstract: A vacuum pump and a washer which can reduce vibration of a rotor and the rotor which can reduce the vibration are provided. When an inertia moment ratio which is a ratio between the inertia moment around a z-axis and the inertia moment around an x-axis or a y-axis is larger than 1, a natural frequency ?2 does not match a rotational frequency ?z but goes away from that. When the natural frequency ?2 matches the rotational frequency ?z, the rotor vibrates and thus, a fatigue failure occurs in a rotor blade. When the rotor is to be made larger in a radial direction of a rotating shaft, a value of the inertia moment ratio is set to a value larger than 1.
    Type: Grant
    Filed: July 3, 2020
    Date of Patent: April 2, 2024
    Assignee: Edwards Japan Limited
    Inventors: Katsuhisa Yokozuka, Yoshinobu Ohtachi, Yasushi Maejima, Tsutomu Takaada
  • VACUUM PUMP, ROTOR, AND WASHER
    Publication number: 20220268289
    Abstract: A vacuum pump and a washer which can reduce vibration of a rotor and the rotor which can reduce the vibration are provided. When an inertia moment ratio which is a ratio between the inertia moment around a z-axis and the inertia moment around an x-axis or a y-axis is larger than 1, a natural frequency ?2 does not match a rotational frequency ?z but goes away from that. When the natural frequency ?2 matches the rotational frequency ?z, the rotor vibrates and thus, a fatigue failure occurs in a rotor blade. When the rotor is to be made larger in a radial direction of a rotating shaft, a value of the inertia moment ratio is set to a value larger than 1.
    Type: Application
    Filed: July 3, 2020
    Publication date: August 25, 2022
    Inventors: Katsuhisa Yokozuka, Yoshinobu Ohtachi, Yasushi Maejima, Tsutomu Takaada