Patents by Inventor Kunihiro Tsuchiya
Kunihiro Tsuchiya 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: 11798584Abstract: There is provided a bearing device including: a tubular sleeve; a shaft held inside the sleeve; and a first bearing, a second bearing, a third bearing, and a fourth bearing, rotatably holding the shaft with respect to the sleeve and arranged in this order in an axial direction. An outer circumferential surface of an outer ring of each of the first to fourth bearings is fixed to an inner circumferential surface of the sleeve, a gap is provided between inner circumferential surfaces of inner rings of the second and third bearings and the shaft, and a spring applying a constant pre-load is provided between the inner rings of the second and third bearings.Type: GrantFiled: March 29, 2022Date of Patent: October 24, 2023Assignee: MINEBEA MITSUMI Inc.Inventor: Kunihiro Tsuchiya
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Publication number: 20220319545Abstract: There is provided a bearing device including: a tubular sleeve; a shaft held inside the sleeve; and a first bearing, a second bearing, a third bearing, and a fourth bearing, rotatably holding the shaft with respect to the sleeve and arranged in this order in an axial direction. An outer circumferential surface of an outer ring of each of the first to fourth bearings is fixed to an inner circumferential surface of the sleeve, a gap is provided between inner circumferential surfaces of inner rings of the second and third bearings and the shaft, and a spring applying a constant pre-load is provided between the inner rings of the second and third bearings.Type: ApplicationFiled: March 29, 2022Publication date: October 6, 2022Inventor: Kunihiro TSUCHIYA
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Patent number: 11137022Abstract: A pivot assembly bearing apparatus includes: a shaft extending in an axial direction, a first rolling bearing, a second rolling bearing and a first sleeve bonded to an outer peripheral surface of the first outer ring of the first rolling bearing, a second sleeve bonded to an outer peripheral surface of the second outer ring of the second rolling bearing and a spacer abutting on a lower end surface of the first outer ring and an upper end surface of the second outer ring. A part of the first sleeve protruding downwards in the axial direction from the first outer ring is bonded to the spacer, and a part of the second sleeve protruding upwards in the axial direction from the second outer ring is bonded to the spacer.Type: GrantFiled: August 7, 2020Date of Patent: October 5, 2021Assignee: MINEBEA MITSUMI INC.Inventor: Kunihiro Tsuchiya
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Publication number: 20210040985Abstract: A pivot assembly bearing apparatus includes: a shaft extending in an axial direction, a first rolling bearing, a second rolling bearing and a first sleeve bonded to an outer peripheral surface of the first outer ring of the first rolling bearing, a second sleeve bonded to an outer peripheral surface of the second outer ring of the second rolling bearing and a spacer abutting on a lower end surface of the first outer ring and an upper end surface of the second outer ring. A part of the first sleeve protruding downwards in the axial direction from the first outer ring is bonded to the spacer, and a part of the second sleeve protruding upwards in the axial direction from the second outer ring is bonded to the spacer.Type: ApplicationFiled: August 7, 2020Publication date: February 11, 2021Inventor: Kunihiro TSUCHIYA
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Patent number: 10839834Abstract: A technique for swinging swing arms stably by reducing vibrations of bearing units due to resonance in rolling bearings is provided. A pivot assembly bearing device 1 includes a shaft 10 extending in an axis Y1 direction, and an upper bearing unit 20 and a lower bearing unit 60 that are provided along the axis Y1 direction of the shaft 10. A natural frequency of the upper bearing unit 20 and a natural frequency of the lower bearing unit 60 in the axis Y1 direction of the shaft 10 differ from each other.Type: GrantFiled: November 22, 2019Date of Patent: November 17, 2020Assignee: MINEBEA MITSUMI INC.Inventors: Kunihiro Tsuchiya, Atsushi Kaneko, Tadashi Uchida
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Publication number: 20200176025Abstract: A technique for swinging swing arms stably by reducing vibrations of bearing units due to resonance in rolling bearings is provided. A pivot assembly bearing device 1 includes a shaft 10 extending in an axis Y1 direction, and an upper bearing unit 20 and a lower bearing unit 60 that are provided along the axis Y1 direction of the shaft 10. A natural frequency of the upper bearing unit 20 and a natural frequency of the lower bearing unit 60 in the axis Y1 direction of the shaft 10 differ from each other.Type: ApplicationFiled: November 22, 2019Publication date: June 4, 2020Inventors: Kunihiro TSUCHIYA, Atsushi KANEKO, Tadashi UCHIDA
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Patent number: 10508687Abstract: A pivot assembly bearing device includes a shaft having an outer peripheral surface and a rolling bearing fixed to the shaft. An annular sealing surface axially overlapping with at least a part of an end surface of the rolling bearing is provided on an axially outer side of the rolling bearing. An oil-repellent film is annularly formed on at least one of the sealing surface and a part of the outer peripheral surface of the shaft located axially outward from the rolling bearing.Type: GrantFiled: November 20, 2018Date of Patent: December 17, 2019Assignee: Minebea Mitsumi Inc.Inventors: Atsushi Kaneko, Shinya Ohnuma, Kunihiro Tsuchiya
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Publication number: 20190162235Abstract: A pivot assembly bearing device includes a shaft having an outer peripheral surface and a rolling bearing fixed to the shaft. An annular sealing surface axially overlapping with at least a part of an end surface of the rolling bearing is provided on an axially outer side of the rolling bearing. An oil-repellent film is annularly formed on at least one of the sealing surface and a part of the outer peripheral surface of the shaft located axially outward from the rolling bearing.Type: ApplicationFiled: November 20, 2018Publication date: May 30, 2019Inventors: Atsushi KANEKO, Shinya OHNUMA, Kunihiro TSUCHIYA
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Patent number: 9640207Abstract: In order to prevent leaking of lubricant, the bearing device includes a rolling bearing having an outer ring and an inner ring, a shaft fixed to the inner ring, and a sleeve fixed to the outer ring. A flange part is formed on at least one end part of the shaft. The flange part includes a disk part extending from the shaft toward an outside in a radial direction and a cylindrical part extending from the disk part along an axial direction. The cylindrical part is disposed at an outside of the outer ring, and a labyrinth gap which bends at two places is formed by gaps.Type: GrantFiled: March 7, 2016Date of Patent: May 2, 2017Assignee: MINEBEA CO., LTD.Inventor: Kunihiro Tsuchiya
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Patent number: 9542964Abstract: A pivot assembly bearing includes a shaft, a sleeve provided coaxially with the shaft, and a pair of rolling bearings arranged to be separated from each other in an axial direction between the shaft and the sleeve. The sleeve includes a ventilation path configured to communicate a region surrounded by the shaft, the pair of rolling bearings, and the sleeve with the outside of the sleeve.Type: GrantFiled: October 27, 2015Date of Patent: January 10, 2017Assignee: MINEBEA CO., LTD.Inventors: Atsushi Kaneko, Kunihiro Tsuchiya
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Patent number: 9500233Abstract: A pivot assembly bearing includes: a sleeve, a shaft inserted into the sleeve, a pair of rolling bearings disposed between the sleeve and the shaft such that the rolling bearings are separated apart from each other in an axial direction. The rolling bearings include an inner ring fixed to the shaft, an outer ring fixed to the sleeve, and a rolling element provided between the inner ring and the outer ring. In at least one of the rolling bearings, a first sealing member contacts an end face of the outer ring facing an outer side in the axial direction. Thus, a first labyrinth gap between the first sealing member and an end face of the inner ring facing the outer side in the axial direction, and a second labyrinth gap between the first sealing member and the shaft are formed.Type: GrantFiled: November 9, 2015Date of Patent: November 22, 2016Assignee: MINEBEA CO., LTD.Inventors: Kunihiro Tsuchiya, Tadashi Uchida
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Publication number: 20160189736Abstract: In order to prevent leaking of lubricant, the bearing device includes a rolling bearing having an outer ring and an inner ring, a shaft fixed to the inner ring, and a sleeve fixed to the outer ring. A flange part is formed on at least one end part of the shaft. The flange part includes a disk part extending from the shaft toward an outside in a radial direction and a cylindrical part extending from the disk part along an axial direction. The cylindrical part is disposed at an outside of the outer ring, and a labyrinth gap which bends at two places is formed by gaps.Type: ApplicationFiled: March 7, 2016Publication date: June 30, 2016Applicant: Minebea Co., Ltd.Inventor: Kunihiro TSUCHIYA
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Publication number: 20160131190Abstract: A pivot assembly bearing includes: a sleeve, a shaft inserted into the sleeve, a pair of rolling bearings disposed between the sleeve and the shaft such that the rolling bearings are separated apart from each other in an axial direction. The rolling bearings include an inner ring fixed to the shaft, an outer ring fixed to the sleeve, and a rolling element provided between the inner ring and the outer ring. In at least one of the rolling bearings, a first sealing member contacts an end face of the outer ring facing an outer side in the axial direction. Thus, a first labyrinth gap between the first sealing member and an end face of the inner ring facing the outer side in the axial direction, and a second labyrinth gap between the first sealing member and the shaft are formed.Type: ApplicationFiled: November 9, 2015Publication date: May 12, 2016Inventors: Kunihiro TSUCHIYA, Tadashi UCHIDA
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Patent number: 9330711Abstract: In order to prevent leaking of lubricant, the bearing device includes a rolling bearing having an outer ring and an inner ring, a shaft fixed to the inner ring, and a sleeve fixed to the outer ring. A flange part is formed on at least one end part of the shaft. The flange part includes a disk part extending from the shaft toward an outside in a radial direction and a cylindrical part extending from the disk part along an axial direction. The cylindrical part is disposed at an outside of the outer ring, and a labyrinth gap which bends at two places is formed by gaps.Type: GrantFiled: August 21, 2014Date of Patent: May 3, 2016Assignee: MINEBEA CO., LTD.Inventor: Kunihiro Tsuchiya
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Publication number: 20160118068Abstract: A pivot assembly bearing includes a shaft, a sleeve provided coaxially with the shaft, and a pair of rolling bearings arranged to be separated from each other in an axial direction between the shaft and the sleeve. The sleeve includes a ventilation path configured to communicate a region surrounded by the shaft, the pair of rolling bearings, and the sleeve with the outside of the sleeve.Type: ApplicationFiled: October 27, 2015Publication date: April 28, 2016Inventors: Atsushi KANEKO, Kunihiro TSUCHIYA
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Publication number: 20150055250Abstract: In order to prevent leaking of lubricant, the bearing device includes a rolling bearing 102 having an outer ring 102c and an inner ring 102a, a shaft 101 fixed to the inner ring 102a, and a sleeve 104 fixed to the outer ring 102c. A flange part 105 is formed on at least one end part of the shaft 101. The flange part 105 includes a disk part 105b extending from the shaft 101 toward an outside in a radial direction and a cylindrical part 105a extending from the disk part 105b along an axial direction. The cylindrical part 105b is disposed at an outside of the outer ring 102c, and a labyrinth gap which bends at two places is formed by gaps 107, 108 and 109.Type: ApplicationFiled: August 21, 2014Publication date: February 26, 2015Inventor: Kunihiro TSUCHIYA
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Patent number: 8947832Abstract: A bearing device includes a shaft having an axis, plural rolling bearings arranged at axially separated positions and rotatably supporting the shaft, a first cylindrical member for supporting the rolling bearings therein and having a first screw on a part of an outer surface thereof, a second cylindrical member having a second screw engaging with the first screw on an inner surface thereof and mounted to the outer surface of the first cylindrical member by engaging the first screw with the second screw, a restricting member provided on the outer surface of the second cylindrical member for preventing relative axial movement of the second cylindrical member with respect to the first cylindrical member when a portion of the second member contacts the restricting member.Type: GrantFiled: December 23, 2010Date of Patent: February 3, 2015Assignee: Minebea Co., Ltd.Inventor: Kunihiro Tsuchiya
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Patent number: 8646987Abstract: A pivot assembly bearing having a bearing inner ring, a shaft, a bearing outer ring, a housing, and an UV curable anaerobic adhesive fixing the bearing inner ring to the shaft, and the bearing outer ring to the housing, wherein the adhesive includes 15 to 25% of urethane acrylate, 45 to 55% of acrylic acid diester, less than 3% of acrylic acid monomer, 15 to 30% of hydroxyalkylmethacrylate, less than 3% of anaerobic catalyst, and less than 3% of photopolymerization initiating agent, and in addition, a coloring agent, if necessary. The pivot assembly bearing reduces outgas, shortens adhesive curing time, and no tack at the adhesive surface is obtained.Type: GrantFiled: January 14, 2013Date of Patent: February 11, 2014Assignee: Minebea Co., Ltd.Inventor: Kunihiro Tsuchiya
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Patent number: 8376626Abstract: A pivot assembly bearing having a bearing inner ring, a shaft, a bearing outer ring, a housing, and an UV curable anaerobic adhesive fixing the bearing inner ring to the shaft, and the bearing outer ring to the housing, wherein the adhesive includes 15 to 25% of urethane acrylate, 45 to 55% of acrylic acid diester, less than 3% of acrylic acid monomer, 15 to 30% of hydroxyalkylmethacrylate, less than 3% of anaerobic catalyst, and less than 3% of photopolymerization initiating agent, and in addition, a coloring agent, if necessary. The pivot assembly bearing reduces outgas, shortens adhesive curing time, and no tack at the adhesive surface is obtained.Type: GrantFiled: April 5, 2011Date of Patent: February 19, 2013Assignee: Minebea Co., Ltd.Inventor: Kunihiro Tsuchiya
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Publication number: 20110249922Abstract: The present invention provides a pivot assembly bearing having a bearing inner ring, a shaft, a bearing outer ring, a housing, and an UV curable anaerobic adhesive fixing the bearing inner ring to the shaft, and the bearing outer ring to the housing, and that the adhesive includes 15 to 25% of urethane acrylate, 45 to 55% of acrylic acid diester, less than 3% of acrylic acid monomer, 15 to 30% of hydroxyalkylmethacrylate, less than 3% of anaerobic catalyst, and less than 3% of photopolymerization initiating agent, and in addition, a coloring agent, if necessary. As a result, a pivot assembly bearing with reduced outgas, shorter adhesive curing time, and no tack at the adhesive surface is obtained.Type: ApplicationFiled: April 5, 2011Publication date: October 13, 2011Applicant: MINEBEA CO., LTD.Inventor: Kunihiro TSUCHIYA