Patents by Inventor Yuichiro Tokunaga

Yuichiro Tokunaga 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).

  • Patent number: 11525512
    Abstract: Provided is a seal ring configured so that stable lubrication performance can be provided across a wide range of rotation speed. A seal ring for sealing a clearance between a rotary shaft and a housing includes; inclined grooves formed at a sliding surface so as to be arranged in a circumferential direction, the inclined grooves being closed on an outer diameter side thereof and configured to generate a dynamic pressure; and supply grooves opening on a sealed fluid side and communicating with an inner diameter side of the inclined grooves.
    Type: Grant
    Filed: May 16, 2019
    Date of Patent: December 13, 2022
    Inventors: Wataru Kimura, Yuichiro Tokunaga, Yoshiaki Takigahira, Toru Kono, Hidetoshi Kasahara, Jun Hiromatsu, Takafumi Ota
  • Patent number: 11428324
    Abstract: In an exemplary embodiment, a seal device (10) that seals between a housing (11) and a rotation shaft (20) passing through the housing (11) includes: a floating ring (15) arranged with a gap h with respect to the rotation shaft (20), a seal portion (14) formed by bringing one end face of the floating ring (15) into contact with the housing (11), and a space portion j provided between the floating ring (15) and the housing (11), and the floating ring (15) includes bias means that contactlessly biases the floating ring (15) to the seal portion via the space portion j. The seal device in which the floating ring follows movement of the rotation shaft is capable of exerting a sealing operation so that vibration of the rotation shaft can be reduced.
    Type: Grant
    Filed: March 27, 2018
    Date of Patent: August 30, 2022
    Inventors: Yuichiro Tokunaga, Hideyuki Inoue, Wataru Kimura, Tetsuya Iguchi, Hidetoshi Kasahara, Jun Hiromatsu, Yasuhiro Kuroki, Ryu Kikuchi
  • Publication number: 20220268361
    Abstract: Low-torque sliding components have sliding surfaces rotated relative to each other with an annular mating ring and an annular seal ring facing each other. The sliding surface of at least one of the mating ring and the seal ring has therein a plurality of multi-stepped recess portions formed in a circumferential direction. Relative rotation and sliding of the mating ring and the seal ring causes the multi-stepped recess portions to generate a dynamic pressure, and the multi-stepped recess portion is formed in a stepwise shape in a cross-sectional view by a dynamic pressure recess portion and a static pressure recess portion with the dynamic pressure recess portion surrounding the static pressure recess portion deeper than the dynamic pressure recess portion.
    Type: Application
    Filed: March 9, 2022
    Publication date: August 25, 2022
    Inventors: Tadatsugu IMURA, Hiroyuki HASHIMOTO, Yuichiro TOKUNAGA, Hideyuki INOUE
  • Patent number: 11320052
    Abstract: Low-torque sliding components have sliding surfaces rotated relative to each other with an annular mating ring and an annular seal ring facing each other. The sliding surface of at least one of the mating ring and the seal ring has therein a plurality of multi-stepped recess portions formed in a circumferential direction. Relative rotation and sliding of the mating ring and the seal ring causes the multi-stepped recess portions to generate a dynamic pressure, and the multi-stepped recess portion is formed in a stepwise shape in a cross-sectional view by a dynamic pressure recess portion and a static pressure recess portion with the dynamic pressure recess portion surrounding the static pressure recess portion deeper than the dynamic pressure recess portion.
    Type: Grant
    Filed: January 31, 2019
    Date of Patent: May 3, 2022
    Inventors: Tadatsugu Imura, Hiroyuki Hashimoto, Yuichiro Tokunaga, Hideyuki Inoue
  • Publication number: 20220128092
    Abstract: A sliding component includes: a dynamic pressure generation groove provided in a sliding surface of the sliding component, the dynamic pressure generation groove having a first end forming a closed end and a second end forming an inlet communicating with any one side of a sealed fluid side and a leakage side in a radial direction; and a deep groove provided in the sliding surface and deeper than the dynamic pressure generation groove, an inlet 16a of the deep groove communicating with an inlet of the dynamic pressure generation groove on a side of a side wall of the dynamic pressure generation groove, the side wall being circumferentially opposite to a dynamic pressure generation wall constituting another side wall of the dynamic pressure generation groove.
    Type: Application
    Filed: February 12, 2020
    Publication date: April 28, 2022
    Inventors: Yuichiro TOKUNAGA, Tadatsugu IMURA, Hiroshi SUZUKI, Iwa OU
  • Publication number: 20220106980
    Abstract: To provide sliding components capable of suppressing dynamic pressure generation mechanisms from being deformed and damaged due to wear of sliding surfaces. In a pair of sliding components which is disposed at a relatively rotating position of a rotary machine, has a plurality of dynamic pressure generation mechanisms formed in a sliding surface of the sliding component by recessed portions, and is formed in an annular shape to seal a sealed fluid by sliding the sliding surfaces of the sliding components. A surface region in the periphery of the recessed portions of the sliding component is formed to be separated from an opposite region of the sliding component.
    Type: Application
    Filed: February 12, 2020
    Publication date: April 7, 2022
    Inventors: Tadatsugu IMURA, Hiroshi SUZUKI, Iwa OU, Yuichiro TOKUNAGA
  • Patent number: 11293553
    Abstract: Provided is a seal ring configured so that a fluid film can be formed between sliding surfaces across a wide range of rotation speed and configured with high lubricity. A seal ring for sealing a clearance between a rotary shaft and a housing includes, dynamic pressure grooves formed at a sliding surface of the seal ring and having positive pressure generators and negative pressure generators, and static pressure supply paths formed at the sliding surface of the seal ring to extend from an inner diameter side to an outer diameter side and to open on a sealed fluid side. Each of the positive pressure generators, each of the negative pressure generators, and each of the static pressure supply paths are arranged in description order in a circumferential direction of the sliding surface.
    Type: Grant
    Filed: May 16, 2019
    Date of Patent: April 5, 2022
    Inventors: Wataru Kimura, Yuichiro Tokunaga, Yoshiaki Takigahira, Toru Kono, Hidetoshi Kasahara, Jun Hiromatsu, Takafumi Ota
  • Publication number: 20220099190
    Abstract: A sliding component having an annular shape is disposed in a place where relative rotation is performed in a rotary machine, in which a plurality of dynamic pressure generating mechanisms are provided in a sliding surface of the sliding component, each including a deep groove portion that communicates with an outer diameter side, and at least one shallow groove portion that communicates with the deep groove portion and extends in a circumferential direction, and the deep groove portion is provided with a trap portion that suppresses a sealed liquid in the deep groove portion from leaking to a leakage side.
    Type: Application
    Filed: January 31, 2020
    Publication date: March 31, 2022
    Inventors: Iwa OU, Tadatsugu IMURA, Hiroshi SUZUKI, Yuichiro TOKUNAGA
  • Publication number: 20220099138
    Abstract: A pair of sliding components are disposed at a relatively rotating position at the time of running a rotary machine and formed in an annular shape in which a sealed liquid is present on one side of an inner radial side and an outer radial side and a gas is present on the remaining side thereof. A sliding surface of a sliding component is provided with a dynamic pressure generation groove which communicates with the side of a gas in a radial direction and which is configured to generate a dynamic pressure between the sliding surfaces by the gas at the time of running the rotary machine. A sliding surface of a sliding component is provided with a groove which extends in a circumferential direction.
    Type: Application
    Filed: February 19, 2020
    Publication date: March 31, 2022
    Inventors: Hiroshi SUZUKI, Tadatsugu IMURA, Iwa OU, Yuichiro TOKUNAGA
  • Publication number: 20220099191
    Abstract: A sliding surface of the sliding component is provided with a communication groove having a start point communicating with a sealed fluid side in a radial direction, a storage groove communicating with the communication groove, and a plurality of dynamic pressure generation grooves generating a dynamic pressure at end points thereof upon a run of the rotating machine and the dynamic pressure generation grooves are located on a side of the sealed fluid side space with respect to the storage groove in the radial direction.
    Type: Application
    Filed: December 6, 2019
    Publication date: March 31, 2022
    Inventors: Hiroshi SUZUKI, Yuichiro TOKUNAGA, Yuta NEGISHI, Hiroki INOUE, Shogo FUKUDA, Wataru KIMURA
  • Publication number: 20220056956
    Abstract: A sliding surface of an annular sliding component disposed at a relatively rotating position of a rotating machine is provided with a plurality of dynamic pressure generating groove groups arranged in a circumferential direction, each including a plurality of dynamic pressure generating grooves having a start point opening to one radial edge of the sliding surface S and an end point closing within the sliding surface while extending circumferentially, in the circumferential direction.
    Type: Application
    Filed: December 19, 2019
    Publication date: February 24, 2022
    Inventors: Tadatsugu IMURA, Hiroshi SUZUKI, Yuichiro TOKUNAGA
  • Patent number: 11248706
    Abstract: In a pair of sliding components having respective sliding faces (S) which slide relative to each other, at least one of the sliding faces (S) is provided with a plurality of dimples (10), and the dimples (10) include a concave part (15), and a peripheral edge part (11) which is located at the outer peripheral part of the concave part (15) and is shallower than the concave part (15). Accordingly, the performance of the plurality of dimples formed on the sliding face can be sufficiently exploited, thereby improving their lubrication performance and sealing performance.
    Type: Grant
    Filed: July 4, 2018
    Date of Patent: February 15, 2022
    Assignee: EAGLE INDUSTRY CO., LTD.
    Inventors: Tadatsugu Imura, Hideyuki Inoue, Yuichiro Tokunaga
  • Patent number: 11248707
    Abstract: In an exemplary embodiment, a pair of sliding components has sliding surfaces that slide with respect to each other, wherein at least one of the sliding surfaces, sliding surface S, includes a random dimple group 11 in which plural dimples 10 are randomly arranged, and the random dimple group 11 is arranged to be biased in the circumferential direction of the sliding surface S. The sliding components have an improved lubricating property and reliability of a sealing property.
    Type: Grant
    Filed: May 15, 2018
    Date of Patent: February 15, 2022
    Assignee: EAGLE INDUSTRY CO., LTD
    Inventors: Tadatsugu Imura, Ayano Tanishima, Hideyuki Inoue, Yuichiro Tokunaga, Takeshi Hosoe, Yuta Negishi, Yuki Maetani
  • Publication number: 20220042602
    Abstract: A pair of sliding members sliding relative to each other at sliding faces (S) is configured such that at least one of the sliding faces (S) includes a negative pressure generation mechanism (21) separated from a leakage side by a leakage-side land portion (R2) and a land portion (26) arranged in the negative pressure generation mechanism (21). In the compact sliding members, sliding torque can be reduced and a sealing function can be maintained.
    Type: Application
    Filed: September 27, 2019
    Publication date: February 10, 2022
    Inventor: Yuichiro TOKUNAGA
  • Publication number: 20210355992
    Abstract: A pair of sliding members sliding relative to each other at sliding faces is configured such that at least one of the sliding faces (S) includes a negative pressure generation mechanism (41) surrounded by a land portion and a branched portion (42) arranged in the sliding face S and branched from the negative pressure generation mechanism (41). The sliding members can be formed compact and is applicable to equipment for rotation in both directions, while sliding torque reduction and sealing function improvement can be realized.
    Type: Application
    Filed: October 11, 2019
    Publication date: November 18, 2021
    Inventor: Yuichiro TOKUNAGA
  • Patent number: 11168793
    Abstract: In an exemplary embodiment, a pair of sliding components has sliding surfaces that slide with respect to each other, wherein at least the sliding surface S on one side includes a random dimple group 11 in which plural dimples 10 are randomly arranged, and at least one land portion 15 that partitions radial portions 11a, 11b of the random dimple group 11. According to the configurations, a lubricating effect and a sealing effect can be improved.
    Type: Grant
    Filed: May 12, 2018
    Date of Patent: November 9, 2021
    Assignee: EAGLE INDUSTRY CO., LTD.
    Inventors: Ayano Tanishima, Tadatsugu Imura, Hideyuki Inoue, Yuichiro Tokunaga, Takeshi Hosoe, Yuta Negishi, Yuki Maetani
  • Patent number: 11143232
    Abstract: In an exemplary embodiment of a sliding component, a sliding face S is provided with a first fluid-side negative pressure generation mechanism 12 including a first negative pressure generation groove 13, and is provided with a second fluid-side negative pressure generation mechanism 14 including second negative pressure generation grooves 15 located on the second-fluid side of the first fluid-side negative pressure generation mechanism 12, and is further provided with a dynamic pressure generation mechanism 10 including dynamic pressure generation grooves 11 on at least one of the first-fluid side and the second-fluid side of the first fluid-side negative pressure generation mechanism 12 and the second fluid-side negative pressure generation mechanism 14, and the first negative pressure generation groove 13 is isolated from the second-fluid side by a land R, and the second negative pressure generation grooves 15 are isolated from the first-fluid side by a land R.
    Type: Grant
    Filed: November 14, 2017
    Date of Patent: October 12, 2021
    Assignee: EAGLE INDUSTRY CO., LTD.
    Inventors: Yuta Negishi, Sayaka Kosugi, Hiroki Inoue, Hideyuki Inoue, Takeshi Hosoe, Yuichiro Tokunaga
  • Patent number: 11143029
    Abstract: In an exemplary embodiment, a sealing member 11 is provided between a rotating body 5 rotating while whirling within an accommodating chamber 4 partitioned by a housing and a side wall 3 of the accommodating chamber 4 and has a sliding surface S sliding on the side wall 3, and the sliding surface S includes a first lubrication mechanism 21 arranged on one side in the longitudinal direction, and a second lubrication mechanism 22 arranged on the other side in the longitudinal direction and exhibiting lubrication performance in a sliding direction different from that of the first lubrication mechanism 21, thereby improving sealing performance of the sealing member.
    Type: Grant
    Filed: November 17, 2017
    Date of Patent: October 12, 2021
    Assignee: EAGLE INDUSTRY CO., LTD
    Inventors: Yuichiro Tokunaga, Masatoshi Itadani, Akira Yoshino
  • Patent number: 11125335
    Abstract: In an exemplary embodiment, a sliding component includes a pair of sliding parts sliding relatively to each other. One sliding part is a stationary-side seal ring 7, and the other sliding part is a rotating-side seal ring 4, wherein the seal rings have sliding faces S formed radially for sealing a liquid or a misty fluid as a sealed fluid against leakage. At least one of the sliding faces S is provided with: spiral grooves 11 which have upstream ends 11a connected to a leakage side, and downstream ends 11b not connected to a circumferential edge on a sealed-fluid side, and are disposed at an angle from upstream to downstream; and discharge grooves 10 disposed at an angle such that their upstream ends 10a are located on the leakage side and their downstream ends 10b are located on the sealed-fluid side.
    Type: Grant
    Filed: January 15, 2018
    Date of Patent: September 21, 2021
    Assignee: EAGLE INDUSTRY CO., LTD.
    Inventors: Wataru Kimura, Yuichiro Tokunaga, Yuta Negishi, Takeshi Hosoe, Hideyuki Inoue, Tetsuya Iguchi
  • Patent number: 11085539
    Abstract: A sealing device includes a floating ring in a space between the outer circumference of a rotating shaft and the inner circumference of a housing, and a multi-layered cylindrical body including a plurality of elastically deformable cylindrical thin plates layered on top of each other provided between an outer peripheral surface of the floating ring and an inner peripheral surface of the housing, so as to impart a radial restoring force against the eccentricity of the rotating shaft to restore it to its center position, and a tangential damping force to reduce the whirling of the rotating shaft.
    Type: Grant
    Filed: February 16, 2018
    Date of Patent: August 10, 2021
    Assignee: EAGLE INDUSTRY CO., LTD.
    Inventors: Yuichiro Tokunaga, Hideyuki Inoue, Wataru Kimura, Tetsuya Iguchi, Hidetoshi Kasahara, Jun Hiromatsu, Yasuhiro Kuroki, Ryu Kikuchi