Patents by Inventor Tomoya Sakaguchi
Tomoya Sakaguchi 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: 20240158551Abstract: A fluororesin that includes a residue unit represented by formula (1), and a terminal group represented by formula (2); and a fluororesin that includes a residue unit represented by formula (1) and has a transmittance of 50% or more measured at an optical path length of 10 mm and a wavelength of 275 nm when dissolved in perfluorohexane to produce a 10 wt % perfluorohexane solution. In formula (1): Rf1, Rf2, Rf3, and Rf4 each independently represent one selected from the group consisting of fluorine atoms, C1-7 linear perfluoroalkyl groups, C3-7 branched perfluoroalkyl groups, or C3-7 cyclic perfluoroalkyl groups; the perfluoroalkyl groups may have an etheric oxygen atom; Rf1, Rf2, Rf3, and Rf4 may bond to each other to form a ring having 4 to 8 carbon atoms; and the ring may include an etheric oxygen atom. In formula (2), i is an integer of 3-20.Type: ApplicationFiled: December 22, 2023Publication date: May 16, 2024Applicant: TOSOH CORPORATIONInventors: Kota SAKAGUCHI, Kazunari IWANAGA, Tomoya SHIMONO, Tomonari NAGAI, Hiroshi YAMAKAWA
-
Publication number: 20240141081Abstract: A fluororesin including a residue unit of formula (1) and having a haze value equal to 2% or less of a heat-press molded product (thickness 1 mm) with a small haze value of a melt-molded product and a method for producing the same, Rf1, Rf2, Rf3 and Rf4 each independently represent one of the groups consisting of a fluorine atom, a linear perfluoroalkyl group having 1 to 7 carbon atoms, a branched perfluoroalkyl group having 3 to 7 carbon atoms, and a cyclic perfluoroalkyl group having 3 to 7 carbon atoms, the perfluoroalkyl group may have an ethereal oxygen atom, Rf1, Rf2, Rf3 and Rf4 may be linked to each other to form a ring having 4 or more and 8 or less carbon atoms, and the ring may include an ethereal oxygen atom.Type: ApplicationFiled: January 8, 2024Publication date: May 2, 2024Applicant: TOSOH CORPORATIONInventors: Kota SAKAGUCHI, Tomoya SHIMONO, Tomonari NAGAI, Kazunari IWANAGA, Shohei YUMINO, Masao TANABIKI, Toru DOI
-
Publication number: 20240076426Abstract: The present invention relates to resin particles including a residue unit represented by the following general formula (1) and having a volume average particle diameter equal to or more than 5 ?m and equal to or less than 2008 ?m, and a method for producing thereof. Fruthermore the present invention relates to a fluororesin comprising a residue unit represented by a general formula (1) and having a weight average molecular weight Mw in a range of 5×104 to 3×105, and a yellow index of a heat-melted molded product (thickness 3 mm) after 24 h at 280° C. of equal to or less than 6, and a method for producing thereof. In the formula (1), Rf1, Rf2, Rf3, and Rf4 are each independently one of the groups consisting of a fluorine atom, a linear perfluoroalkyl group having 1 to 7 carbon atoms, a branched perfluoroalkyl group having 3 to 7 carbon atoms, or a cyclic perfluoroalkyl group having 3 to 7 carbon atoms. The perfluoroalkyl group may have an ethereal oxygen atom.Type: ApplicationFiled: September 21, 2023Publication date: March 7, 2024Applicant: TOSOH CORPORATIONInventors: Shohei YUMINO, Tomoya SHIMONO, Kota SAKAGUCHI, Tomonari NAGAI, Kazunari IWANAGA, Masao TANABIKI, Toru DOI
-
Publication number: 20220403874Abstract: To provide a hub bearing that is capable of reducing a delay in a response of the hub bearing and improving a steering stability of a vehicle. A hub bearing 1 includes an outer ring 2 serving as a stationary side raceway ring, a hub wheel 3 and an inner ring 5 serving as a rotatable side raceway ring, balls 4 serving as a plurality of rolling elements disposed between a raceway surface of the stationary side raceway ring and a raceway surface of the rotatable side raceway ring, and grease that lubricates a rolling contact part between each of the raceway surfaces and the rolling elements. The surface roughness of at least one raceway surface selected from the raceway surface of the stationary side raceway ring and the raceway surface of the rotatable side raceway ring in the rolling contact part is 0.03 ?mRa or less. Further, the grease has a traction coefficient in the rolling contact part of 0.04 or less at 40° C. when a vehicle speed is 20 km/h or more.Type: ApplicationFiled: November 2, 2020Publication date: December 22, 2022Inventors: Tomoya SAKAGUCHI, Naoto SHIBUYA, Makoto SEKI
-
Patent number: 10669480Abstract: A phosphorescent phosphor having a high afterglow luminance is provided. The phosphorescent phosphor comprises, as a matrix, a compound represented by MAl2O4, the metal element represented by M comprising Sr, Mg and Ba, and the phosphorescent phosphor containing, Eu as an activator, and Dy as a co-activator, wherein the content of Eu, in terms of molar ratio, is 0.001?Eu/(M+Eu+Dy)?0.05; the content of Dy, in terms of molar ratio, is 0.004?Dy/(M+Eu+Dy)?0.06; the content of Mg, in terms of molar ratio, is 0.02?Mg/(M+Eu+Dy)?0.1; the content of Ba, in terms of molar ratio, is 0.03?Ba/(M+Eu+Dy)?0.15; and the phosphorescent phosphor contains at least one alkali metal element of the group consisting of Li, Na, K and rubidium (Rb). Mg and Ba as well as the alkali metal element(s) contained in the phosphorescent phosphor provide an excellent phosphorescent phosphor having a high afterglow luminance.Type: GrantFiled: March 9, 2015Date of Patent: June 2, 2020Assignee: NEMOTO & CO., LTD.Inventors: Masashi Kato, Tomoya Sakaguchi
-
Patent number: 10519935Abstract: A condition monitoring system for a wind turbine includes: each sensor to sense a condition of equipment; a monitor device configured to generate a diagnosis parameter based on a detection result of each sensor; a data server configured to diagnose a failure of the equipment based on the diagnosis parameter; and a rotation angle sensor for sensing the nacelle's rotation speed. The data server is configured to correct the diagnosis parameter based on a sensed result of the rotation angle sensor, and diagnose whether the equipment has a failure by comparing the corrected diagnosis parameter with a predetermined threshold value.Type: GrantFiled: May 29, 2015Date of Patent: December 31, 2019Assignee: NTN CORPORATIONInventors: Tomoya Sakaguchi, Kouma Katou
-
Patent number: 10408267Abstract: A tapered roller bearing (31a) has a plurality of retainer segments (11a, 11d) each having a pocket to house a tapered roller (34a), and arranged so as to be continuously lined with each other in a circumferential direction between an outer ring (32a) and an inner ring (33a). The retainer segment (11a, 11d) is formed of a resin containing a filler material to lower a thermal linear expansion coefficient. In addition, a clearance (39a) is provided between the first retainer segment (11a) and the last retainer segment (11d) after the plurality of retainer segments (11a, 11d) have been arranged in the circumferential direction without providing any clearance. Here a circumferential range (R) of the clearance (39a) is larger than 0.075% of a circumference of a circle passing through a center of the retainer segment (11a, 11d) and smaller than 0.12% thereof at room temperature.Type: GrantFiled: September 22, 2017Date of Patent: September 10, 2019Assignee: NTN CORPORATIONInventors: Tatsuya Omoto, Eiichi Nakamizo, Tomoya Sakaguchi
-
Patent number: 10337958Abstract: A vibration analysis method includes the steps of: inputting damage data of a rolling bearing; calculating, by a dynamics analysis program, a history of an exciting force occurring to the rolling bearing due to damage when a rotational shaft of the rolling bearing is rotated; calculating, by a mode analysis program, a vibration characteristics model of the bearing device; and calculating a vibration waveform at a predetermined position on the bearing device by applying to the vibration characteristics model the history of the exciting force calculated in the step of calculating a history of an exciting force.Type: GrantFiled: December 19, 2013Date of Patent: July 2, 2019Assignee: NTN CORPORATIONInventors: Tomoya Sakaguchi, Hideyuki Tsutsui
-
Patent number: 10190576Abstract: A roller bearing comprises an outer ring, an inner ring, a plurality of rollers arranged between said outer ring and said inner ring; and a plurality of retainer segments having a plurality of column parts extending in a direction along a shaft so as to form a pocket for holding said roller. A connection part extends in a circumferential direction so as to connect the plurality of column parts, and continuously lined with each other in the circumferential direction between said outer ring and said inner ring, in which a corner of a circumferential end face is chamfered. Also provided is a spacer arranged between the circumferentially arranged first retainer segment and last retainer segment, wherein a chamfered part is provided at a corner of a circumferential spacer end face of the space. The roller bearing can be used in a main shaft support structure of a wind-power generator.Type: GrantFiled: July 6, 2017Date of Patent: January 29, 2019Assignee: NTN CORPORATIONInventors: Tatsuya Omoto, Shoichi Hioki, Mitsuo Sasabe, Eiichi Nakamizo, Tomoya Sakaguchi
-
Patent number: 10100815Abstract: Frequency analysis units are configured to perform a frequency analysis of vibrations detected by vibration sensors, respectively. A natural frequency detection unit is configured to detect a natural frequency of a wind turbine in accordance with a direction of a nacelle, based on results of the frequency analysis. A change ratio calculation unit calculates a decrease ratio in the natural frequency detected by the natural frequency detection unit. An abnormality detection unit determines that an abnormality is present in the wind turbine if the decrease ratio in the natural frequency calculated by the change ratio calculation unit exceeds a threshold value.Type: GrantFiled: September 3, 2014Date of Patent: October 16, 2018Assignee: NTN CORPORATIONInventor: Tomoya Sakaguchi
-
Patent number: 10047726Abstract: A condition monitoring system for a wind turbine comprises: a sensor which senses a condition of a yaw bearing; a monitor device which generates a diagnosis parameter based on a detection result of the sensor; a sensor which senses a rotating angular velocity of a nacelle and that of a main shaft; and a data server which diagnoses a failure of the yaw bearing based on the diagnosis parameter. The data server diagnoses whether the yaw bearing has a failure, based on a variation of the diagnosis parameter from an initial value thereof when the nacelle has a rotating angular velocity within a non-zero, first prescribed range and the main shaft has a rotating angular velocity within a second prescribed range.Type: GrantFiled: July 9, 2015Date of Patent: August 14, 2018Assignee: NTN CorporationInventor: Tomoya Sakaguchi
-
Publication number: 20180010639Abstract: A tapered roller bearing (31a) has a plurality of retainer segments (11a, 11d) each having a pocket to house a tapered roller (34a), and arranged so as to be continuously lined with each other in a circumferential direction between an outer ring (32a) and an inner ring (33a). The retainer segment (11a, 11d) is formed of a resin containing a filler material to lower a thermal linear expansion coefficient. In addition, a clearance (39a) is provided between the first retainer segment (11a) and the last retainer segment (11d) after the plurality of retainer segments (11a, 11d) have been arranged in the circumferential direction without providing any clearance. Here a circumferential range (R) of the clearance (39a) is larger than 0.075% of a circumference of a circle passing through a center of the retainer segment (11a, 11d) and smaller than 0.12% thereof at room temperature.Type: ApplicationFiled: September 22, 2017Publication date: January 11, 2018Inventors: Tatsuya OMOTO, Eiichi NAKAMIZO, Tomoya SAKAGUCHI
-
Patent number: 9810263Abstract: A tapered roller bearing (31a) has a plurality of retainer segments (11a, 11d) each having a pocket to house a tapered roller (34a), and arranged so as to be continuously lined with each other in a circumferential direction between an outer ring (32a) and an inner ring (33a). The retainer segment (11a, 11d) is formed of a resin containing a filler material to lower a thermal linear expansion coefficient. In addition, a clearance (39a) is provided between the first retainer segment (11a) and the last retainer segment (11d) after the plurality of retainer segments (11a, 11d) have been arranged in the circumferential direction without providing any clearance. Here a circumferential range (R) of the clearance (39a) is larger than 0.075% of a circumference of a circle passing through a center of the retainer segment (11a, 11d) and smaller than 0.12% thereof at room temperature.Type: GrantFiled: May 16, 2014Date of Patent: November 7, 2017Assignee: NTN CORPORATIONInventors: Tatsuya Omoto, Eiichi Nakamizo, Tomoya Sakaguchi
-
Publication number: 20170306929Abstract: A roller bearing comprises an outer ring, an inner ring, a plurality of rollers arranged between said outer ring and said inner ring; and a plurality of retainer segments having a plurality of column parts extending in a direction along a shaft so as to form a pocket for holding said roller. A connection part extends in a circumferential direction so as to connect the plurality of column parts, and continuously lined with each other in the circumferential direction between said outer ring and said inner ring, in which a corner of a circumferential end face is chamfered. Also provided is a spacer arranged between the circumferentially arranged first retainer segment and last retainer segment, wherein a chamfered part is provided at a corner of a circumferential spacer end face of the space. The roller bearing can be used in a main shaft support structure of a wind-power generator.Type: ApplicationFiled: July 6, 2017Publication date: October 26, 2017Inventors: Tatsuya OMOTO, Shoichi HIOKI, Mitsuo SASABE, Eiichi NAKAMIZO, Tomoya SAKAGUCHI
-
Publication number: 20170260968Abstract: A displacement sensor detects a displacement of a main shaft, thereby detecting a relative displacement between an inner race and an outer race of a bearing. A data processor carries out an abnormality diagnosis for the bearing based on a detected value of the displacement sensor. The data processor carries out an abnormality diagnosis based on a difference between the detected value of the displacement sensor under a first axial load condition for the bearing and the detected value of the displacement sensor under a second axial load condition different from the first axial load condition. Thereby, an abnormality diagnosing apparatus for a rolling bearing is provided, by which a highly accurate abnoiiiiality diagnosis can be implemented even if installation states of a displacement sensor and an object to be measured are changed due to maintenance or repair.Type: ApplicationFiled: August 25, 2015Publication date: September 14, 2017Inventors: Hideyuki TSUTSUI, Tomoya SAKAGUCHI
-
Publication number: 20170234304Abstract: A condition monitoring system for a wind turbine comprises: a sensor which senses a condition of a yaw bearing; a monitor device which generates a diagnosis parameter based on a detection result of the sensor; a sensor which senses a rotating angular velocity of a nacelle and that of a main shaft; and a data server which diagnoses a failure of the yaw bearing based on the diagnosis parameter. The data server diagnoses whether the yaw bearing has a failure, based on a variation of the diagnosis parameter from an initial value thereof when the nacelle has a rotating angular velocity within a non-zero, first prescribed range and the main shaft has a rotating angular velocity within a second prescribed range.Type: ApplicationFiled: July 9, 2015Publication date: August 17, 2017Inventor: Tomoya SAKAGUCHI
-
Patent number: 9732734Abstract: A roller bearing comprises an outer ring, an inner ring, a plurality of rollers arranged between the outer ring and the inner ring, and a plurality of retainer segments having a plurality of column parts extending in a direction along a shaft so as to form a pocket for holding the roller, and connection parts and extending in a circumferential direction to connect the plurality of column parts, and continuously lined with each other in the circumferential direction between the outer ring and the inner ring. The column part is positioned at an circumferential end of the retainer segment. Here, a circumferential outer side end face of the column part positioned at the end is flat, and a circumferential inner side end face of the column part positioned at said end is provided with a recess recessed in the circumferential direction to reduce the thickness of the column part.Type: GrantFiled: November 5, 2014Date of Patent: August 15, 2017Assignee: NTN CORPORATIONInventors: Tatsuya Omoto, Shoichi Hioki, Mitsuo Sasabe, Eiichi Nakamizo, Tomoya Sakaguchi
-
Roller bearing, retainer segment of roller bearing for supporting main shaft of wind-power generator
Patent number: 9664231Abstract: A tapered roller bearing (31a) has a plurality of retainer segments (11a, 11d) each having a pocket to house a tapered roller (34a), and arranged so as to be continuously lined with each other in a circumferential direction between an outer ring (32a) and an inner ring (33a). The retainer segment (11a, 11d) is formed of a resin containing a filler material to lower a thermal linear expansion coefficient. In addition, a clearance (39a) is provided between the first retainer segment (11a) and the last retainer segment (11d) after the plurality of retainer segments (11a, 11d) have been arranged in the circumferential direction without providing any clearance. Here a circumferential range (R) of the clearance (39a) is larger than 0.075% of a circumference of a circle passing through a center of the retainer segment (11a, 11d) and smaller than 0.12% thereof at room temperature.Type: GrantFiled: April 22, 2015Date of Patent: May 30, 2017Assignee: NTN CORPORATIONInventors: Tatsuya Omoto, Eiichi Nakamizo, Tomoya Sakaguchi -
Publication number: 20170130700Abstract: A condition monitoring system for a wind turbine includes: each sensor to sense a condition of equipment; a monitor device configured to generate a diagnosis parameter based on a detection result of each sensor; a data server configured to diagnose a failure of the equipment based on the diagnosis parameter; and a rotation angle sensor for sensing the nacelle's rotation speed. The data server is configured to correct the diagnosis parameter based on a sensed result of the rotation angle sensor, and diagnose whether the equipment has a failure by comparing the corrected diagnosis parameter with a predetermined threshold value.Type: ApplicationFiled: May 29, 2015Publication date: May 11, 2017Inventors: Tomoya SAKAGUCHI, Kouma KATOU
-
Publication number: 20160319190Abstract: A phosphorescent phosphor having a high afterglow luminance is provided. The phosphorescent phosphor comprises, as a matrix, a compound represented by MAl2O4, the metal element represented by M comprising Sr, Mg and Ba, and the phosphorescent phosphor containing, Eu as an activator, and Dy as a co-activator, wherein the content of Eu, in terms of molar ratio, is 0.001?Eu/(M+Eu+Dy)?0.05; the content of Dy, in terms of molar ratio, is 0.004?Dy/(M+Eu+Dy)?0.06; the content of Mg, in terms of molar ratio, is 0.02?Mg/(M+Eu+Dy)?0.1; the content of Ba, in terms of molar ratio, is 0.03?Ba/(M+Eu+Dy)?0.15; and the phosphorescent phosphor contains at least one alkali metal element of the group consisting of Li, Na, K and rubidium (Rb). Mg and Ba as well as the alkali metal element(s) contained in the phosphorescent phosphor provide an excellent phosphorescent phosphor having a high afterglow luminance.Type: ApplicationFiled: March 9, 2015Publication date: November 3, 2016Applicant: NEMOTO LUMI-MATERIALS COMPANY LIMITEDInventors: Masashi KATO, Tomoya SAKAGUCHI