Patents by Inventor Yuta Negishi

Yuta Negishi 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: 20220010835
    Abstract: A sliding component includes a dynamic pressure generation groove configured for generating dynamic pressure on a sliding surface, which groove includes an introduction port formed in one end side of the groove in a circumferential direction and which is open to a sealing target fluid H side, a throttle portion communicating with the introduction port and having a narrowed flow path, and a lead-out port formed on the other end side of the groove, which communicates with the throttle portion and which is open to the sealing target fluid side.
    Type: Application
    Filed: November 22, 2019
    Publication date: January 13, 2022
    Inventors: Hiroki INOUE, Yuta NEGISHI, Yuki MAETANI, Sayaka MIYAZAKI
  • 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: 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: 11053974
    Abstract: In an exemplary embodiment, a sliding component includes a pair of sliding parts 3 and 5 sliding relative to each other, with a high-pressure gas present on one side of the pair of sliding parts 3 and 5 and a low-pressure liquid on the other side. At least the sliding part 5 has a sliding face S provided with positive pressure generation mechanisms 10 each having a positive pressure generation groove 11, and provided with an annular deep groove 14 on the high-pressure gas side. The annular deep groove 14 is isolated from the high-pressure gas side by a land R, and is connected to the low-pressure liquid side through radial deep grooves 13. The sliding component is capable of fulfilling both conflicting conditions of sealing and lubrication, with a gas on the high-pressure fluid side and a liquid on the low-pressure fluid side.
    Type: Grant
    Filed: December 1, 2017
    Date of Patent: July 6, 2021
    Assignee: EAGLE INDUSTRY CO., LTD.
    Inventors: Yuta Negishi, Hiroki Inoue, Yuki Maetani, Takeshi Hosoe, Hideyuki Inoue
  • 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
  • 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
  • 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: 20210054935
    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: Application
    Filed: January 15, 2018
    Publication date: February 25, 2021
    Inventors: Wataru KIMURA, Yuichiro TOKUNAGA, Yuta NEGISHI, Takeshi HOSOE, Hideyuki INOUE, Tetsuya IGUCHI
  • Patent number: 10883604
    Abstract: In an embodiment, a sliding part is provided with a mechanism to generate dynamic pressure by means of relative sliding of a pair of sealing faces of the sliding part, which is characterized in that one sealing face is provided with a land 10 for generating dynamic pressure facing the high-pressure fluid side and a seal area 11 facing the low-pressure fluid side, wherein the land 10 and seal area 11 are positioned away from each other in the radial direction and the areas of the sealing face other than the land 10 and seal area 11 are formed lower than these areas to constitute fluid communication paths 12. The fluid entering the grooves for generating dynamic pressure formed on the sealing face is allowed to circulate.
    Type: Grant
    Filed: December 14, 2017
    Date of Patent: January 5, 2021
    Inventors: Hideyuki Inoue, Takeshi Hosoe, Yuta Negishi, Yuichiro Tokunaga
  • Patent number: 10883603
    Abstract: In an embodiment, a sliding part is provided with a mechanism to generate dynamic pressure by means of relative sliding of a pair of sealing faces of the sliding part, which is characterized in that one sealing face is provided with a land 10 for generating dynamic pressure facing the high-pressure fluid side and a seal area 11 facing the low-pressure fluid side, wherein the land 10 and seal area 11 are positioned away from each other in the radial direction and the areas of the sealing face other than the land 10 and seal area 11 are formed lower than these areas to constitute fluid communication paths 12. The fluid entering the grooves for generating dynamic pressure formed on the sealing face is allowed to circulate.
    Type: Grant
    Filed: December 14, 2017
    Date of Patent: January 5, 2021
    Inventors: Hideyuki Inoue, Takeshi Hosoe, Yuta Negishi, Yuichiro Tokunaga
  • Publication number: 20200392523
    Abstract: The present invention provides a tobacco plant which is suitable for cultivation for harvesting leaf tobaccos. The present invention includes (i) a tobacco plant in which a mutation for suppressing the development of axillary buds is introduced and (ii) a method of producing the tobacco plant.
    Type: Application
    Filed: March 30, 2020
    Publication date: December 17, 2020
    Applicant: JAPAN TOBACCO INC.
    Inventors: Shoichi SUZUKI, Kaori HAMANO, Seiki SATO, Masao ARAI, Yuta NEGISHI, Ayako NOMURA, Mai TSUKAHARA
  • Publication number: 20200378501
    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: Application
    Filed: May 12, 2018
    Publication date: December 3, 2020
    Inventors: Ayano TANISHIMA, Tadatsugu IMURA, Hideyuki INOUE, Yuichiro TOKUNAGA, Takeshi HOSOE, Yuta NEGISHI, Yuki MAETANI
  • Patent number: 10781924
    Abstract: In an embodiment, a sliding part is provided with a mechanism to generate dynamic pressure by means of relative sliding of a pair of sealing faces of the sliding part, which is characterized in that one sealing face is provided with a land 10 for generating dynamic pressure facing the high-pressure fluid side and a seal area 11 facing the low-pressure fluid side, wherein the land 10 and seal area 11 are positioned away from each other in the radial direction and the areas of the sealing face other than the land 10 and seal area 11 are formed lower than these areas to constitute fluid communication paths 12. The fluid entering the grooves for generating dynamic pressure formed on the sealing face is allowed to circulate.
    Type: Grant
    Filed: December 14, 2017
    Date of Patent: September 22, 2020
    Assignee: EAGLE INDUSTRY CO., LTD.
    Inventors: Hideyuki Inoue, Takeshi Hosoe, Yuta Negishi, Yuichiro Tokunaga
  • Publication number: 20200224722
    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: Application
    Filed: July 12, 2018
    Publication date: July 16, 2020
    Inventors: Tadatsugu IMURA, Ayano TANISHIMA, Hideyuki INOUE, Yuichiro TOKUNAGA, Yuta NEGISHI, Yuki MAETANI
  • Publication number: 20200224768
    Abstract: A pair of sliding components have sliding faces (S) that slide with respect to each other, wherein at least one of the sliding faces (S) includes at least one dimple group (11) constituted by plural dimples (12), and each dimple group (11) includes at least one opening portion (11a) that is arranged in the one of the sliding faces (S) and radially open to the outside the one of the sliding faces (S). In the sliding components, a dynamic pressure generation mechanism can easily be formed, and a lubricating performance and a sealing performance can improve.
    Type: Application
    Filed: October 2, 2018
    Publication date: July 16, 2020
    Inventors: Tadatsugu IMURA, Hideyuki INOUE, Yuichiro TOKUNAGA, Yuta NEGISHI, Yuki MAETANI, Ayano TANISHIMA
  • Publication number: 20200158162
    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. The sliding components are excellent in a sealing property by improving a characteristic of suctioning from the leakage side to sliding surfaces.
    Type: Application
    Filed: May 15, 2018
    Publication date: May 21, 2020
    Inventors: Tadatsugu IMURA, Ayano TANISHIMA, Hideyuki INOUE, Yuichiro TOKUNAGA, Takeshi HOSOE, Yuta NEGISHI, Yuki MAETANI