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).

  • 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: 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: 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: 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
  • Patent number: 11078919
    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, wherein the floating ring 15 includes at least one supporting means 18 that supports in the circumferential direction. In the seal device, the floating ring follows movement of the rotation shaft even upon running for a long time, a clearance between the rotation shaft and the seal ring can be properly held, and the sealing operation by the floating ring and the vibration damping function can be exerted, and the seal device is easily assembled.
    Type: Grant
    Filed: February 21, 2018
    Date of Patent: August 3, 2021
    Assignee: EAGLE INDUSTRY CO., LTD
    Inventors: Yuichiro Tokunaga, Hideyuki Inoue, Wataru Kimura, Tetsuya Iguchi, Hidetoshi Kasahara, Jun Hiromatsu, Yasuhiro Kuroki, Ryu Kikuchi
  • Patent number: 11053975
    Abstract: In an exemplary embodiment, a pair of sliding components has annular sliding surfaces that slide with respect to each other in which plural dimples 10 are arranged on at least sliding surface S on one side, wherein the plural dimples 10 are randomly arranged to form a random dimple group 11, and the dimples 10 are arranged in a manner that a radial-direction coordinate average of centers of the dimples 10 of the random dimple group 11 is smaller than a sliding radius 15 of the sliding surface S.
    Type: Grant
    Filed: May 15, 2018
    Date of Patent: July 6, 2021
    Assignee: EAGLE INDUSTRY CO., LTD
    Inventors: Tadatsugu Imura, Ayano Tanishima, Hideyuki Inoue, Yuichiro Tokunaga, Takeshi Hosoe, Yuta Negishi, Yuki Maetani
  • Patent number: 11035411
    Abstract: A pair of sliding parts has sliding faces S that slide with respect to each other in which at least the sliding face S on one side includes dimple groups 20 formed by arranging plural dimples 10, and the dimples 10 are arranged in such a manner that a radial-direction coordinate average of center coordinates of the dimples 10 of the dimple group 20 is smaller than a sliding radius Rm of the sliding face S. The sliding parts can improve a characteristic of suctioning from the leakage side to sliding faces, thereby providing excellent sealing property.
    Type: Grant
    Filed: July 12, 2018
    Date of Patent: June 15, 2021
    Assignee: EAGLE INDUSTRY CO., LTD.
    Inventors: Tadatsugu Imura, Ayano Tanishima, Hideyuki Inoue, Yuichiro Tokunaga, Yuta Negishi, Yuki Maetani
  • Publication number: 20210164571
    Abstract: 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 arranged in a circumferential direction so as to be configured to generate dynamic pressure. The dynamic pressure grooves include deep grooves having openings on a sealed fluid side and shallow grooves being shallower than the deep grooves. The shallower grooves are formed continuously to the deep grooves and extend to at least one side in the circumferential direction.
    Type: Application
    Filed: May 16, 2019
    Publication date: June 3, 2021
    Inventors: Wataru KIMURA, Yuichiro TOKUNAGA, Yoshiaki TAKIGAHIRA, Toru KONO, Hidetoshi KASAHARA, Jun HIROMATSU, Takafumi OTA
  • Patent number: 11009072
    Abstract: In an exemplary embodiment, a sliding component includes a pair of sliding parts 4 and 7 sliding relatively to each other and having sliding faces S formed radially for sealing a liquid or a misty fluid as a sealed fluid against leakage. One sliding part is a stationary-side seal ring 7, and the other sliding part is a rotating-side seal ring 4. At least one of the sliding faces S is provided with positive pressure generation mechanisms 11 having positive pressure generation grooves 12 configured to communicate with a circumferential edge of the sliding face S on the sealed-fluid side and not to communicate with a circumferential edge on the leakage side, and discharge grooves 10 disposed at an angle such that upstream ends are located on the leakage side and downstream ends are located on the sealed-fluid side.
    Type: Grant
    Filed: January 15, 2018
    Date of Patent: May 18, 2021
    Assignee: EAGLE INDUSTRY CO., LTD
    Inventors: Wataru Kimura, Yuichiro Tokunaga, Yuta Negishi, Takeshi Hosoe, Hideyuki Inoue, Tetsuya Iguchi
  • Patent number: 10989249
    Abstract: A sliding component is provided. At least one sliding face of sliding faces sliding relatively to each other of a pair of sliding parts of annular shapes is provided with positive pressure generation mechanisms with positive pressure generation grooves and negative pressure generation mechanisms with negative pressure generation grooves. The positive pressure generation grooves and the negative pressure generation grooves are separated from the opposite-to-sealed-fluid side by a land. Deep grooves deeper than the groove depth of the positive pressure generation grooves and the negative pressure generation grooves are located at least on the opposite-to-sealed-fluid side of the positive pressure generation grooves and the negative pressure generation grooves. The deep grooves are provided in such a manner as to communicate at least with the sealed fluid side.
    Type: Grant
    Filed: November 6, 2017
    Date of Patent: April 27, 2021
    Inventors: Yuta Negishi, Hideyuki Inoue, Takeshi Hosoe, Yuichiro Tokunaga
  • Publication number: 20210116032
    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 multiple static pressure grooves provided at a sliding surface of the seal ring and arranged in a circumferential direction, the static pressure grooves being opened on a sealed fluid side and closed on an outer diameter side, a circumferential length of each of the static pressure grooves being shorter than a radial length of each of the static pressure grooves.
    Type: Application
    Filed: May 16, 2019
    Publication date: April 22, 2021
    Inventors: Wataru KIMURA, Yuichiro TOKUNAGA, Yoshiaki TAKIGAHIRA, Toru KONO, Hidetoshi KASAHARA, Jun HIROMATSU, Takafumi OTA
  • Publication number: 20210116029
    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 open on an outer diameter side of the seal ring to generate a drawing pressure. The seal ring further includes supply grooves being open on a sealed fluid side of the seal ring and extending in a radially outward direction toward inner diameter sides of the inclined grooves.
    Type: Application
    Filed: May 16, 2019
    Publication date: April 22, 2021
    Inventors: Wataru KIMURA, Yuichiro TOKUNAGA, Yoshiaki TAKIGAHIRA, Toru KONO, Hidetoshi KASAHARA, Jun HIROMATSU, Takafumi OTA
  • Publication number: 20210116030
    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: Application
    Filed: May 16, 2019
    Publication date: April 22, 2021
    Inventors: Wataru KIMURA, Yuichiro TOKUNAGA, Yoshiaki TAKIGAHIRA, Toru KONO, Hidetoshi KASAHARA, Jun HIROMATSU, Takafumi OTA
  • Patent number: 10954790
    Abstract: An oil seal member is provided at an outside surface of a member performing whirling motion such as a rotary engine rotor. A sliding face of the oil seal member that slides relatively to a stationary-side member is provided with a step extending circumferentially, and has a relatively high surface formed on one radial side with respect to the step and a relatively low surface on the other radial side. The high surface is provided with pumping grooves to pump oil tending to leak from the high surface side into the low surface side, into the high surface side by sliding relatively to the stationary-side member.
    Type: Grant
    Filed: July 19, 2017
    Date of Patent: March 23, 2021
    Inventors: Yuichiro Tokunaga, Masatoshi Itadani, Akira Yoshino
  • Publication number: 20210080009
    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: Application
    Filed: May 16, 2019
    Publication date: March 18, 2021
    Inventors: Wataru KIMURA, Yuichiro TOKUNAGA, Yoshiaki TAKIGAHIRA, Toru KONO, Hidetoshi KASAHARA, Jun HIROMATSU, Takafumi OTA
  • Patent number: 10941863
    Abstract: A sliding component includes a pair of sliding parts of which a rotating-side sliding part rotates in both forward and reverse directions. In the sliding component, at least one of the sliding parts has a sliding face provided with positive pressure generation grooves on the sealed fluid side, and a negative pressure generation groove on the opposite-to-sealed-fluid side and separated from the opposite-to-sealed-fluid side by a land, and a deep groove communicating with the sealed fluid side on the sealed fluid side of the negative pressure generation groove. The positive pressure generation grooves each have an upstream end communicating with the deep groove, and the negative pressure generation groove has an upstream inlet and a downstream outlet that communicate with the deep groove, and an intermediate portion between the inlet and the outlet located on the opposite-to-sealed-fluid side of the inlet and the outlet.
    Type: Grant
    Filed: November 6, 2017
    Date of Patent: March 9, 2021
    Inventors: Yuta Negishi, Sayaka Kosugi, Hideyuki Inoue, Takeshi Hosoe, Yuichiro Tokunaga
  • Publication number: 20210054934
    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: Application
    Filed: May 15, 2018
    Publication date: February 25, 2021
    Inventors: Tadatsugu IMURA, Ayano TANISHIMA, Hideyuki INOUE, Yuichiro TOKUNAGA, Takeshi HOSOE, Yuta NEGISHI, Yuki MAETANI
  • Publication number: 20210054936
    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: Application
    Filed: March 27, 2018
    Publication date: February 25, 2021
    Inventors: Yuichiro TOKUNAGA, Hideyuki INOUE, Wataru KIMURA, Tetsuya IGUCHI, Hidetoshi KASAHARA, Jun HIROMATSU, Yasuhiro KUROKI, Ryu KIKUCHI