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).
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Patent number: 11078919Abstract: 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: GrantFiled: February 21, 2018Date of Patent: August 3, 2021Assignee: EAGLE INDUSTRY CO., LTDInventors: Yuichiro Tokunaga, Hideyuki Inoue, Wataru Kimura, Tetsuya Iguchi, Hidetoshi Kasahara, Jun Hiromatsu, Yasuhiro Kuroki, Ryu Kikuchi
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Patent number: 11053975Abstract: 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: GrantFiled: May 15, 2018Date of Patent: July 6, 2021Assignee: EAGLE INDUSTRY CO., LTDInventors: Tadatsugu Imura, Ayano Tanishima, Hideyuki Inoue, Yuichiro Tokunaga, Takeshi Hosoe, Yuta Negishi, Yuki Maetani
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Patent number: 11035411Abstract: 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: GrantFiled: July 12, 2018Date of Patent: June 15, 2021Assignee: EAGLE INDUSTRY CO., LTD.Inventors: Tadatsugu Imura, Ayano Tanishima, Hideyuki Inoue, Yuichiro Tokunaga, Yuta Negishi, Yuki Maetani
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Publication number: 20210164571Abstract: 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: ApplicationFiled: May 16, 2019Publication date: June 3, 2021Inventors: Wataru KIMURA, Yuichiro TOKUNAGA, Yoshiaki TAKIGAHIRA, Toru KONO, Hidetoshi KASAHARA, Jun HIROMATSU, Takafumi OTA
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Patent number: 11009072Abstract: 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: GrantFiled: January 15, 2018Date of Patent: May 18, 2021Assignee: EAGLE INDUSTRY CO., LTDInventors: Wataru Kimura, Yuichiro Tokunaga, Yuta Negishi, Takeshi Hosoe, Hideyuki Inoue, Tetsuya Iguchi
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Patent number: 10989249Abstract: 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: GrantFiled: November 6, 2017Date of Patent: April 27, 2021Inventors: Yuta Negishi, Hideyuki Inoue, Takeshi Hosoe, Yuichiro Tokunaga
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Publication number: 20210116029Abstract: 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: ApplicationFiled: May 16, 2019Publication date: April 22, 2021Inventors: Wataru KIMURA, Yuichiro TOKUNAGA, Yoshiaki TAKIGAHIRA, Toru KONO, Hidetoshi KASAHARA, Jun HIROMATSU, Takafumi OTA
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Publication number: 20210116032Abstract: 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: ApplicationFiled: May 16, 2019Publication date: April 22, 2021Inventors: Wataru KIMURA, Yuichiro TOKUNAGA, Yoshiaki TAKIGAHIRA, Toru KONO, Hidetoshi KASAHARA, Jun HIROMATSU, Takafumi OTA
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Publication number: 20210116030Abstract: 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: ApplicationFiled: May 16, 2019Publication date: April 22, 2021Inventors: Wataru KIMURA, Yuichiro TOKUNAGA, Yoshiaki TAKIGAHIRA, Toru KONO, Hidetoshi KASAHARA, Jun HIROMATSU, Takafumi OTA
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Patent number: 10954790Abstract: 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: GrantFiled: July 19, 2017Date of Patent: March 23, 2021Inventors: Yuichiro Tokunaga, Masatoshi Itadani, Akira Yoshino
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Publication number: 20210080009Abstract: 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: ApplicationFiled: May 16, 2019Publication date: March 18, 2021Inventors: Wataru KIMURA, Yuichiro TOKUNAGA, Yoshiaki TAKIGAHIRA, Toru KONO, Hidetoshi KASAHARA, Jun HIROMATSU, Takafumi OTA
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Patent number: 10941863Abstract: 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: GrantFiled: November 6, 2017Date of Patent: March 9, 2021Inventors: Yuta Negishi, Sayaka Kosugi, Hideyuki Inoue, Takeshi Hosoe, Yuichiro Tokunaga
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Publication number: 20210054934Abstract: 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: ApplicationFiled: May 15, 2018Publication date: February 25, 2021Inventors: Tadatsugu IMURA, Ayano TANISHIMA, Hideyuki INOUE, Yuichiro TOKUNAGA, Takeshi HOSOE, Yuta NEGISHI, Yuki MAETANI
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Publication number: 20210054935Abstract: 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: ApplicationFiled: January 15, 2018Publication date: February 25, 2021Inventors: Wataru KIMURA, Yuichiro TOKUNAGA, Yuta NEGISHI, Takeshi HOSOE, Hideyuki INOUE, Tetsuya IGUCHI
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Publication number: 20210054936Abstract: 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: ApplicationFiled: March 27, 2018Publication date: February 25, 2021Inventors: Yuichiro TOKUNAGA, Hideyuki INOUE, Wataru KIMURA, Tetsuya IGUCHI, Hidetoshi KASAHARA, Jun HIROMATSU, Yasuhiro KUROKI, Ryu KIKUCHI
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Publication number: 20210048106Abstract: 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: ApplicationFiled: July 4, 2018Publication date: February 18, 2021Inventors: Tadatsugu IMURA, Hideyuki INOUE, Yuichiro TOKUNAGA
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Publication number: 20210041026Abstract: 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: ApplicationFiled: January 31, 2019Publication date: February 11, 2021Inventors: Tadatsugu IMURA, Hiroyuki HASHIMOTO, Yuichiro TOKUNAGA, Hideyuki INOUE
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Patent number: 10907684Abstract: In a pair of sliding parts having sliding faces S that slide with respect to each other, at least one of the sliding faces S has a one-side peripheral edge (4a) and an other-side peripheral edge (4b) and includes: fluid introduction grooves (12) each of which has one end communicating with the other-side peripheral edge (4b), dynamic pressure generation grooves (11) each of which has one end communicating with the other-side peripheral edge (4b) and the other end being surrounded by a land portion, and a release groove (13) provided in the land portion, the release groove (13) communicating with the fluid introduction grooves (12). With the sliding parts, not only a liquid such as oil but also an oil mist serving as a mixture of oil and air can be sealed as a sealed fluid, and generation of oil mist itself can be reduced.Type: GrantFiled: August 24, 2018Date of Patent: February 2, 2021Assignee: EAGLE INDUSTRY CO., LTD.Inventors: Wataru Kimura, Yuichiro Tokunaga, Hideyuki Inoue, Tetsuya Iguchi, Hidetoshi Kasahara
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Patent number: 10883603Abstract: 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: GrantFiled: December 14, 2017Date of Patent: January 5, 2021Inventors: Hideyuki Inoue, Takeshi Hosoe, Yuta Negishi, Yuichiro Tokunaga
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Patent number: 10883604Abstract: 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: GrantFiled: December 14, 2017Date of Patent: January 5, 2021Inventors: Hideyuki Inoue, Takeshi Hosoe, Yuta Negishi, Yuichiro Tokunaga