Patents by Inventor Yoshiaki Takigahira
Yoshiaki Takigahira 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: 11852244Abstract: A sliding component includes at least one of a pair of sliding members and provided with: a group of recessed portions including a plurality of recessed portions formed in a sliding surface of the sliding member; and a plurality of hollow portions formed inside the sliding member and out of alignment with the recessed portions in a thickness direction of the sliding member. The sliding member is further provided with the hollow portions disposed so as to generate at least part of a new group of recessed portions until the sliding member is worn by the thickness of deepest one of the recessed portions.Type: GrantFiled: January 31, 2020Date of Patent: December 26, 2023Inventors: Hiroyuki Hashimoto, Yoshiaki Takigahira
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Publication number: 20230375035Abstract: Provided is a sliding component having a small starting torque during a start operation. In a sliding component which is disposed at a relatively rotating position of a rotating machine and slides relative to the other sliding component, the sliding component is provided with a storage space which is formed on a back surface side of a sliding surface of the sliding component and into which a fluid is introduced and a plurality of through-holes which communicate with the storage space and have openings opened at the sliding surface on a side opposite to the storage space.Type: ApplicationFiled: October 8, 2021Publication date: November 23, 2023Inventors: Yuki MAETANI, Yoshiaki TAKIGAHIRA
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Patent number: 11815183Abstract: A mechanical seal includes rotating seal ring which rotate with a rotary shaft, stationary seal rings, and an adaptor which holds the stationary seal rings, the adaptor being fixed to a seal cover by bolts. The mechanical seal further includes a plurality of holders brought into contact with the adapter and provided with through holes. A body part of each of the bolts passes through each of the through holes and is screwed into each of threaded holes formed in the seal cover. The plurality of holders being arranged so as to surround the rotary shaft.Type: GrantFiled: November 29, 2022Date of Patent: November 14, 2023Inventors: Masakazu Kito, Yoshiaki Takigahira
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Patent number: 11802623Abstract: A mechanical seal includes rotating seal ring which rotate with a rotary shaft, stationary seal rings, and an adaptor which holds the stationary seal rings 30, the adaptor 5 being fixed to a seal cover by bolts. The mechanical seal further includes a plurality of holders brought into contact with the adapter and provided with through holes. A body part of each of the bolts passes through each of the through holes and is screwed into each of threaded holes formed in the seal cover. The plurality of holders 9 being arranged so as to surround the rotary shaft.Type: GrantFiled: April 2, 2019Date of Patent: October 31, 2023Inventors: Masakazu Kito, Yoshiaki Takigahira
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Publication number: 20230235780Abstract: An annular sliding component includes a sliding surface provided with a plurality of fluid introduction grooves communicating with a space on the side of a sealing target fluid and introducing the sealing target fluid thereinto and a plurality of inclined grooves extending from a leakage side toward the sealing target fluid and generating a dynamic pressure and the sliding surface of the sliding component is provided with a reverse inclined groove which is provided on the side of the sealing target fluid of the inclined groove, extends in a reverse direction with respect to the inclined groove, and generates a dynamic pressure.Type: ApplicationFiled: May 31, 2021Publication date: July 27, 2023Inventors: Yuta NEGISHI, Ryosuke UCHIYAMA, Hiroki INOUE, Minori ONUMA, Yoshiaki TAKIGAHIRA, Hikaru KATORI, Nobuo NAKAHARA, Takeshi HOSOE
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Publication number: 20230228292Abstract: An annular sliding component includes a sliding surface provided with a plurality of fluid introduction grooves communicating with a space on the side of a sealing target fluid and introducing the sealing target fluid and a plurality of inclined grooves extending from a leakage side toward the sealing target fluid and generating a dynamic pressure and the sliding surface of the sliding component is provided with at least a concave portion disposed between adjacent two of the fluid introduction grooves in the circumferential direction.Type: ApplicationFiled: May 31, 2021Publication date: July 20, 2023Inventors: Yuta NEGISHI, Ryosuke UCHIYAMA, Hiroki INOUE, Minori ONUMA, Yoshiaki TAKIGAHIRA, Hikaru KATORI, Nobuo NAKAHARA, Takeshi HOSOE
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Publication number: 20230167905Abstract: A sliding surface of a second sliding component is provided with a plurality of second positive pressure generation grooves communicating with a leakage side space, extending in a relative rotation direction of the second sliding component, and having closed terminating end portions, a sliding surface of a first sliding component is provided with a plurality of first positive pressure generation grooves communicating with the leakage side space, extending in a relative rotation direction of the second sliding component, and having closed terminating end portions, and the sliding surface and the sliding surface slide on each other at least in such a manner that the first positive pressure generation grooves and the second positive pressure generation grooves overlap and intersect with each other.Type: ApplicationFiled: April 2, 2021Publication date: June 1, 2023Inventors: Yuta NEGISHI, Yuki MAETANI, Hiroki INOUE, Ryosuke UCHIYAMA, Minori ONUMA, Gai YAMAGUCHI, So MAKISHIMA, Osamu MATSUMOTO, Yoshiaki TAKIGAHIRA, Koji WATANABE
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Publication number: 20230160473Abstract: The seal structure includes a shaft member, a bush having a shaft hole for passing the shaft member, a pressure-receiving member having a facing surface facing an end surface of the bush on one side in the direction of the axis, and an elastic member that presses the bush against the pressure-receiving member from another side in the direction of the axis, in which a first coating layer is formed between an outer peripheral surface of the shaft member and an inner peripheral surface of the shaft hole of the bush, and a second coating layer is formed between the end surface of the bush on one side in the direction of the axis and the facing surface of the pressure-receiving member.Type: ApplicationFiled: March 26, 2021Publication date: May 25, 2023Inventors: Norimasa HOSONUMA, Yoshiaki TAKIGAHIRA, Takuto FUKUHARA, Kosei HASHIMOTO, Nozomu SUZUKI
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Patent number: 11644100Abstract: 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: GrantFiled: May 16, 2019Date of Patent: May 9, 2023Inventors: Wataru Kimura, Yuichiro Tokunaga, Yoshiaki Takigahira, Toru Kono, Hidetoshi Kasahara, Jun Hiromatsu, Takafumi Ota
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Publication number: 20230109060Abstract: A mechanical seal includes rotating seal ring which rotate with a rotary shaft, stationary seal rings, and an adaptor which holds the stationary seal rings, the adaptor being fixed to a seal cover by bolts. The mechanical seal further includes a plurality of holders brought into contact with the adapter and provided with through holes. A body part of each of the bolts passes through each of the through holes and is screwed into each of threaded holes formed in the seal cover. The plurality of holders being arranged so as to surround the rotary shaft.Type: ApplicationFiled: November 29, 2022Publication date: April 6, 2023Inventors: Masakazu KITO, Yoshiaki TAKIGAHIRA
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Patent number: 11530749Abstract: 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: GrantFiled: May 16, 2019Date of Patent: December 20, 2022Inventors: Wataru Kimura, Yuichiro Tokunaga, Yoshiaki Takigahira, Toru Kono, Hidetoshi Kasahara, Jun Hiromatsu, Takafumi Ota
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Patent number: 11525512Abstract: 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: GrantFiled: May 16, 2019Date of Patent: December 13, 2022Inventors: Wataru Kimura, Yuichiro Tokunaga, Yoshiaki Takigahira, Toru Kono, Hidetoshi Kasahara, Jun Hiromatsu, Takafumi Ota
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Patent number: 11293553Abstract: 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: GrantFiled: May 16, 2019Date of Patent: April 5, 2022Inventors: Wataru Kimura, Yuichiro Tokunaga, Yoshiaki Takigahira, Toru Kono, Hidetoshi Kasahara, Jun Hiromatsu, Takafumi Ota
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Publication number: 20220090683Abstract: A sliding component includes at least one of a pair of sliding members and provided with: a group of recessed portions including a plurality of recessed portions formed in a sliding surface of the sliding member; and a plurality of hollow portions formed inside the sliding member and out of alignment with the recessed portions in a thickness direction of the sliding member. The sliding member is further provided with the hollow portions disposed so as to generate at least part of a new group of recessed portions until the sliding member is worn by the thickness of deepest one of the recessed portions.Type: ApplicationFiled: January 31, 2020Publication date: March 24, 2022Inventors: Hiroyuki HASHIMOTO, Yoshiaki TAKIGAHIRA
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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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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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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: 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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Publication number: 20210018100Abstract: A mechanical seal includes rotating seal ring which rotate with a rotary shaft, stationary seal rings, and an adaptor which holds the stationary seal rings 30, the adaptor 5 being fixed to a seal cover by bolts. The mechanical seal further includes a plurality of holders brought into contact with the adapter and provided with through holes. A body part of each of the bolts passes through each of the through holes and is screwed into each of threaded holes formed in the seal cover. The plurality of holders 9 being arranged so as to surround the rotary shaft.Type: ApplicationFiled: April 2, 2019Publication date: January 21, 2021Inventors: Masakazu KITO, Yoshiaki TAKIGAHIRA