Patents by Inventor Tetsuzo OKADA
Tetsuzo OKADA 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: 11608897Abstract: The purpose of the present invention is to provide a slide component that can exhibit sealing performance and lubricity regardless of rotating direction. A pair of slide components 4, 7 that slide relative to each other have sliding faces S that slide relative to each other, and a sealed fluid-side periphery 16 and a leakage-side periphery 15. The sliding face S of at least one slide component 4 of the pair of slide components 4, 7 includes: a fluid introduction groove 13 in communication with the sealed fluid-side periphery 16; a first pressure generation mechanism 12 of which one end is in communication with the fluid introduction groove 13 and the other end is surrounded by a land portion R1; and a second pressure generation mechanism 11 of which one end is in communication with the leakage-side periphery 15 and the other end is surrounded by an annular land portion R2.Type: GrantFiled: July 30, 2019Date of Patent: March 21, 2023Inventors: Tetsuzo Okada, Masatoshi Itadani, Takeshi Hosoe, Yuki Sasaki, Keita Kajihara
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Patent number: 11543033Abstract: In an exemplary embodiment, a mechanical seal for sealing a fluid flowing outwardly radially from sliding surfaces S where a stationary ring 221 and a rotating ring 211 slide against each other, includes: a bellows 222 interposed between the stationary ring 221 and a stationary wall 226; a case member 223 for holding an outer cylindrical part 222c of the bellows 222 to the stationary ring 221; and a holding member 224 fitted to an inner cylindrical part 222a of the bellows 222, and having an axial length substantially equal to a length fitted to the inner cylindrical part 222a, wherein the bellows 222 has a curved part 222b between the outer cylindrical part 222c and the inner cylindrical part 222a, and the case member 223 is provided with a wall part 223a covering the entire periphery of the radial outer side of the curved part 222b.Type: GrantFiled: December 27, 2017Date of Patent: January 3, 2023Inventors: Masatoshi Itadani, Yuki Sasaki, Keiichi Chiba, Kenji Kiryu, Tetsuzo Okada
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Patent number: 11221071Abstract: Provided is a sliding component with less fluid leakage. A sliding component has a pair of sliding members at least one of which has positive pressure generation mechanisms and negative pressure generation mechanisms formed at a sliding surface of the sliding member. The negative pressure generation mechanisms are arranged on a low-pressure fluid side with respect to the positive pressure generation mechanisms. Adjoining two of the negative pressure generation mechanisms in a circumferential direction overlap with each other in a radial direction.Type: GrantFiled: September 4, 2018Date of Patent: January 11, 2022Inventors: Yuki Sasaki, Tetsuzo Okada, Masatoshi Itadani, Takeshi Hosoe
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Publication number: 20210364034Abstract: A pair of slide components (4, 7) have sliding faces (S) sliding relative to each other, and a sealed fluid-side periphery (16) and a leakage-side periphery (15). The sliding face (S) of at least one slide component includes: a fluid introduction groove (13) in communication with the sealed fluid-side periphery (16); a first pressure generation mechanism (12) of which one end is in communication with the fluid introduction groove (13) and the other end is surrounded by a land portion (R1); and a second pressure generation mechanism (11) of which one end is in communication with the leakage-side periphery (15) and the other end is surrounded by an annular land portion (R2). The fluid introduction groove (13) and the other end (12e) of the first pressure generation mechanism (12) include overlapping portions (Lp) overlapping circumferentially. The slide components can exhibit sealing performance and lubricity regardless of rotating direction.Type: ApplicationFiled: July 30, 2019Publication date: November 25, 2021Inventors: Tetsuzo OKADA, Masatoshi ITADANI, Takeshi HOSOE, Yuki SASAKI, Keita KAJIHARA
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Patent number: 11009130Abstract: In an exemplary embodiment, a sliding component includes an annular stationary side seal ring 5 fixed to the stationary side and an annular rotating side seal ring 3 to be rotated together with a rotating shaft, in which by relatively rotating opposing sealing faces S of the stationary side seal ring 5 and the rotating side seal ring 3, a silicate-containing sealed fluid present on one side in the radial direction of the relatively rotating sealing faces S is sealed, wherein an amorphous carbon film 8 formed by using a hydrocarbon gas containing no silicon compound is provided on at least any one of the sealing faces S of the stationary side seal ring 5 and the rotating side seal ring 3, and content of silicon of the amorphous carbon film 8 is 1.5 at % or less.Type: GrantFiled: September 29, 2017Date of Patent: May 18, 2021Assignees: EAGLE INDUSTRY CO., LTD., NOK CORPORATIONInventors: Masatoshi Itadani, Kazumasa Sunagawa, Tetsuzo Okada, Keiichi Chiba, Kenji Kiryu, Tadahiro Kimura, Akiko Koga
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Publication number: 20210080006Abstract: Provided is a sliding component with less fluid leakage. A sliding component has a pair of sliding members at least one of which has positive pressure generation mechanisms and negative pressure generation mechanisms formed at a sliding surface of the sliding member. The negative pressure generation mechanisms are arranged on a low-pressure fluid side with respect to the positive pressure generation mechanisms. Adjoining two of the negative pressure generation mechanisms in a circumferential direction overlap with each other in a radial direction.Type: ApplicationFiled: September 4, 2018Publication date: March 18, 2021Inventors: Yuki SASAKI, Tetsuzo OKADA, Masatoshi ITADANI, Takeshi HOSOE
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Publication number: 20210048107Abstract: A sealing apparatus includes a rotating shaft to seal a first space where a fluid flows and a second space accommodating a device that is vulnerable to the fluid. A main seal partially defines the first space to restrict the fluid from leaking from the first space and includes a rotating seal ring provided on the rotating shaft, a stationary seal ring firmly provided in the equipment, and biasing member 18 configured to bias the rotating seal ring and the stationary seal ring in a facing direction; and an auxiliary seal that partially defines the second space to prevent the fluid from infiltrating into the second space and is in sliding contact with the rotating shaft of a member connected to the rotating shaft at a position which is different from a position of the main seal.Type: ApplicationFiled: January 24, 2019Publication date: February 18, 2021Inventors: Tadahiro KIMURA, Tetsuzo OKADA
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Publication number: 20200182356Abstract: In an exemplary embodiment, a sliding component includes an annular stationary side seal ring 5 fixed to the stationary side and an annular rotating side seal ring 3 to be rotated together with a rotating shaft, in which by relatively rotating opposing sealing faces S of the stationary side seal ring 5 and the rotating side seal ring 3, a silicate-containing sealed fluid present on one side in the radial direction of the relatively rotating sealing faces S is sealed, wherein an amorphous carbon film 8 formed by using a hydrocarbon gas containing no silicon compound is provided on at least any one of the sealing faces S of the stationary side seal ring 5 and the rotating side seal ring 3, and content of silicon of the amorphous carbon film 8 is 1.5 at % or less.Type: ApplicationFiled: September 29, 2017Publication date: June 11, 2020Inventors: Masatoshi ITADANI, Kazumasa SUNAGAWA, Tetsuzo OKADA, Keiichi CHIBA, Kenji KIRYU, Tadahiro KIMURA, Akiko KOGA
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Publication number: 20190331227Abstract: In an exemplary embodiment, a mechanical seal for sealing a fluid flowing outwardly radially from sliding surfaces S where a stationary ring 221 and a rotating ring 211 slide against each other, includes: a bellows 222 interposed between the stationary ring 221 and a stationary wall 226; a case member 223 for holding an outer cylindrical part 222c of the bellows 222 to the stationary ring 221; and a holding member 224 fitted to an inner cylindrical part 222a of the bellows 222, and having an axial length substantially equal to a length fitted to the inner cylindrical part 222a, wherein the bellows 222 has a curved part 222b between the outer cylindrical part 222c and the inner cylindrical part 222a, and the case member 223 is provided with a wall part 223a covering the entire periphery of the radial outer side of the curved part 222b.Type: ApplicationFiled: December 27, 2017Publication date: October 31, 2019Inventors: Masatoshi ITADANI, Yuki SASAKI, Keiichi CHIBA, Kenji KIRYU, Tetsuzo OKADA
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Patent number: 10280977Abstract: In an embodiment, a slide component includes a circular ring-shaped stationary-side seal ring 5 fixed to a stationary side and a circular ring-shaped rotating-side seal ring 3 rotating with a rotating shaft 1, and relatively rotates respective opposed sliding faces S of the stationary-side seal ring 5 and the rotating-side seal ring 3, thereby sealing a sealed fluid present on one side in a radial direction of the sliding face relatively rotating and sliding, wherein the sealed fluid is a silicate containing fluid; and on at least either one sliding face of the stationary-side seal ring 5 and the rotating-side seal ring 3, an amorphous carbon film 10 formed by using hydrocarbon gas not containing organosilicon compound gas in a plasma CVD method is laminated. The slide component can seal a silicate containing sealed fluid to which silicate is added.Type: GrantFiled: April 7, 2016Date of Patent: May 7, 2019Assignees: EAGLE INDUSTRY CO., LTD, NOK CORPORATIONInventors: Masatoshi Itadani, Kazumasa Sunagawa, Tetsuzo Okada, Keiichi Chiba, Kenji Kiryu, Akiko Koga
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Publication number: 20180112711Abstract: In an embodiment, a slide component includes a circular ring-shaped stationary-side seal ring 5 fixed to a stationary side and a circular ring-shaped rotating-side seal ring 3 rotating with a rotating shaft 1, and relatively rotates respective opposed sliding faces S of the stationary-side seal ring 5 and the rotating-side seal ring 3, thereby sealing a sealed fluid present on one side in a radial direction of the sliding face relatively rotating and sliding, wherein the sealed fluid is a silicate containing fluid; and on at least either one sliding face of the stationary-side seal ring 5 and the rotating-side seal ring 3, an amorphous carbon film 10 formed by using hydrocarbon gas not containing organosilicon compound gas in a plasma CVD method is laminated. The slide component can seal a silicate containing sealed fluid to which silicate is added.Type: ApplicationFiled: April 7, 2016Publication date: April 26, 2018Inventors: Masatoshi ITADANI, Kazumasa SUNAGAWA, Tetsuzo OKADA, Keiichi CHIBA, Kenji KIRYU, Akiko KOGA