Patents by Inventor Hisato YONAI

Hisato YONAI 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).

  • Publication number: 20210215200
    Abstract: A sealing apparatus which is capable of preventing static leakage of a target to be sealed without increasing sliding resistance with respect to a shaft, and a surface processing method of a disk member of the sealing apparatus which is capable of processing a surface of the disk member, such as a slinger, provided at the sealing apparatus. A surface processing method of a disk member of a sealing apparatus for forming a plurality of fine spiral grooves on a surface of the disk member provided at the sealing apparatus has a grinding member having a plurality of fine projections that is moved to an outer edge side while the grinding member is pressed against the surface of the disk member which relatively rotates around an axis, and the sealing apparatus includes a slinger at which a plurality of fine spiral grooves are randomly formed on another side surface of a flange portion.
    Type: Application
    Filed: October 24, 2019
    Publication date: July 15, 2021
    Applicant: NOK CORPORATION
    Inventors: Hisato YONAI, Yuya SAKANO, Masahiko INOUE
  • Publication number: 20210215250
    Abstract: A sealing device includes a reinforcing ring having annular shape around an axis line and an elastic body part formed from an elastic body, the elastic body part being attached to the reinforcing ring and having an annular shape around the axis line. The elastic body part includes an annular seal lip and an annular side lip that is provided on an outer side of the seal lip and that extends toward the outer side. In an inner peripheral surface of the side lip on an inner periphery side, at least one circumferential groove which is a groove having an annular shape around the axis line is provided and at least one axial groove which is a groove extending along a direction of the axis line is provided. The circumferential groove and the axial groove are connected with each other.
    Type: Application
    Filed: July 2, 2019
    Publication date: July 15, 2021
    Inventors: Takumi YAMADA, Hiromi SUGIHARA, Hisato YONAI, Toshiki WATANABE, Satoshi YAMANAKA, Yu YAMAGUCHI
  • Publication number: 20210010599
    Abstract: A sealing device includes a seal lip located inside a hole of an outer member and in slidable contact with the inner member. The seal lip has an inclined surface arranged on a side of the internal space, an atmosphere-side inclined surface, and a lip edge on a boundary between the inclined surfaces. Multiple first helical ribs and multiple second helical ribs extending from the lip edge and in contact with the outer peripheral surface of the inner member are formed on the atmosphere-side inclined surface. In addition, multiple first dike ribs and multiple second dike ribs are formed on the atmosphere-side inclined surface, which are arranged away from the lip edge and are not in contact with the inner member. The first dike ribs are arranged to intersect the extended lines of the first helical ribs, respectively, and are inclined in the opposite direction to the first helical ribs.
    Type: Application
    Filed: August 9, 2019
    Publication date: January 14, 2021
    Applicant: NOK CORPORATION
    Inventors: Hisato YONAI, Yu YAMAGUCHI
  • Publication number: 20200166138
    Abstract: A sealing apparatus includes a slinger and a seal part. The slinger has a cylindrical part and an annular flange part extending from an inner end part of the cylindrical part perpendicular to an axis of a rotational shaft. The seal part has a main lip configured to slidably contact a flat outer side surface of the flange part of the slinger to thereby seal lubricant. A groove is formed at a portion on the outer side surface of the flange part that contacts the main lip, and the groove is configured to exhibit a discharging action of returning the lubricant when the rotational shaft rotates. A narrowing and miniaturizing structure is formed and configured to reduce a relative contact angle that is formed by the flange part and the main lip when the outer side surface of the flange part contacts the main lip.
    Type: Application
    Filed: January 3, 2020
    Publication date: May 28, 2020
    Inventors: Hisato YONAI, Yuya SAKANO
  • Publication number: 20200124178
    Abstract: A sealing apparatus includes a sealing apparatus body and a slinger. The sealing apparatus body includes a reinforcing ring annular around an axis line, and an elastic body portion attached to the reinforcing ring and annular around the axis line. The slinger includes a flange portion extending toward an outer peripheral side and annular around the axis line. The elastic body portion includes an annular end-face lip contacting the flange portion from another side in the axis line direction. At least one groove is formed on the other side of the flange portion of the slinger. At least one circumferential-direction projection is formed on an inner peripheral surface of the end-face lip. The circumferential-direction projection extends in an annular shape around the axis line and projects between the inner peripheral surface of the end-face lip and a surface of the flange portion on the other side.
    Type: Application
    Filed: December 17, 2019
    Publication date: April 23, 2020
    Inventors: Yuya SAKANO, Hiroki MATSUI, Kokichi HAMAMOTO, Takehiro NAKAGAWA, Hisato YONAI
  • Publication number: 20200096112
    Abstract: A sealing apparatus 1 includes a sealing apparatus body 2 and a slinger 3. The sealing apparatus body 2 includes an annular reinforcing ring 10 and an annular elastic body portion 20. The slinger 3 includes a flange portion 31 which is an annular portion extending toward an outer periphery side. The elastic body portion 20 includes an annular end-face lip 21 extending toward an inner side and contacting an outer side surface 31d of the flange portion 31. At least one shallow groove 33 is formed on the outer side surface 31d of the flange portion 31 of the slinger 3.
    Type: Application
    Filed: November 27, 2019
    Publication date: March 26, 2020
    Inventors: Sosuke ITO, Masahiko INOUE, Hisato YONAI, Yuya SAKANO
  • Publication number: 20200011423
    Abstract: A sealing apparatus 1 includes a sealing apparatus body 2 and a slinger 3. The sealing apparatus body 2 includes an annular reinforcing ring 10 and an annular elastic body portion 20 formed of an elastic body mounted on the reinforcing ring 10. The slinger 3 includes a flange portion 31 which is an annular portion extending toward an outer peripheral side. The elastic body portion 20 includes an end-face lip 21 which is an annular lip extending toward an inner side and contacts the flange portion 31 from an outer side. At least one groove 33 is formed on an outer side of the flange portion 31 of the slinger 3, on a surface of the end-face lip 21 on an inner peripheral side, a plurality of radial projections 23 are formed side by side in a circumferential direction, and at least one circumferential projection 24 is formed.
    Type: Application
    Filed: September 20, 2019
    Publication date: January 9, 2020
    Inventors: Sosuke ITO, Masahiko INOUE, Yuya SAKANO, Hiroki MATSUI, Kokichi HAMAMOTO, Takehiro NAKAGAWA, Hisato YONAI
  • Publication number: 20190277403
    Abstract: A sealing apparatus which seals an annular gap of a hole into which a shaft is to be inserted, includes a sealing apparatus body to be fitted into the hole, and a slinger to be attached to the shaft. The sealing apparatus body includes a reinforcing ring annular around an axis line, and an elastic body portion attached to the reinforcing ring and annular around the axis line. The slinger includes a flange portion extending toward an outer periphery side and annular around the axis line. The elastic body portion includes an end-face lip extending on one side in an axis line direction, contacting the flange portion from another side in the axis line direction, and annular around the axis line.
    Type: Application
    Filed: May 28, 2019
    Publication date: September 12, 2019
    Inventors: Yuya SAKANO, Hiroki MATSUI, Kokichi HAMAMOTO, Takehiro NAKAGAWA, Hisato YONAI, Masahiko INOUE