Patents by Inventor Nariaki Aihara
Nariaki Aihara 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: 20240384759Abstract: [Problem] To provide a linear motion device using a highly reliable and environmentally friendly separator that improves a dimensional stability, ductility, and adhesion of greases based on poly-?-olefin oil, which are required for separators, and also prevents deformation at high speeds. [Solution] Provided is a linear motion device including a linear motion body (15) that is fitted onto a screw shaft (11) and moves straight along the screw shaft (11), a large number of balls (B) held in a ball groove (14) formed on an inner surface side of the linear motion body (15) and rolling between the ball groove (14) and the screw shaft (11), a separator (100) interposed 10 between each ball (B), a circulation passage (18) formed in the linear motion body (15) and circulating the ball (B) from one end side of the ball groove (14) to the other end side, where at least one of the separator (100) and the circulation passage (18) is formed from polyamide 410 by injection molding.Type: ApplicationFiled: March 25, 2022Publication date: November 21, 2024Applicant: NSK LTD.Inventors: Toshikazu YABE, Keisuke YOKOYAMA, Shintaro HONDA, Nariaki AIHARA
-
Publication number: 20230358278Abstract: Provided is a rolling bearing using a retainer, particularly a highly reliable retainer in which dimensional stability required for a retainer of an outer ring guide type, ductility required for a crown-type retainer, improvement in adhesion of grease with a poly-?-olefin oil or the like as a base oil, and deformation prevention at a high speed can be achieved. The rolling bearing includes at least an inner ring 1, an outer ring 3, a synthetic resin retainer 9, and a rolling element 7, in which the synthetic resin retainer 9 is formed of a polyamide resin composition including polyamide 410 and a reinforcing fiber material with a content of 0% by weight to 40% by weight.Type: ApplicationFiled: September 27, 2021Publication date: November 9, 2023Applicant: NSK LTD.Inventors: Toshikazu YABE, Tomoaki MATSUMOTO, AZUMA ITO, Keisuke YOKOYAMA, Nariaki AIHARA, Shintaro HONDA
-
Publication number: 20220388209Abstract: The resin injection gate is disposed at the pillar part. When the bearing cage is divided into first and second regions by an imaginary line connecting the resin injection gate and a weld to be formed at a position radially facing the resin injection gate, a resin reservoir that can store therein the melted resin is formed at the pillar part in only one of the regions. A circumferential distance between the resin reservoir and the weld is smaller than a circumferential distance between the resin reservoir and the resin injection gate. A cross-sectional area of a communicating part of the resin reservoir, which is configured to communicate with the pillar part, is equal to or less than a quarter of a cross-sectional area of the resin injection gate.Type: ApplicationFiled: August 18, 2022Publication date: December 8, 2022Applicant: NSK LTD.Inventors: Yoshikazu Kuramoto, Nariaki Aihara, Takayuki Hiramoto
-
Patent number: 11465319Abstract: The resin injection gate is disposed at the pillar part. When the bearing cage is divided into first and second regions by an imaginary line connecting the resin injection gate and a weld to be formed at a position radially facing the resin injection gate, a resin reservoir that can store therein the melted resin is formed at the pillar part in only one of the regions. A circumferential distance between the resin reservoir and the weld is smaller than a circumferential distance between the resin reservoir and the resin injection gate. A cross-sectional area of a communicating part of the resin reservoir, which is configured to communicate with the pillar part, is equal to or less than a quarter of a cross-sectional area of the resin injection gate.Type: GrantFiled: February 19, 2016Date of Patent: October 11, 2022Assignee: NSK LTD.Inventors: Yoshikazu Kuramoto, Nariaki Aihara, Takayuki Hiramoto
-
Patent number: 10377070Abstract: A resin reservoir capable of storing the melted resin is provided in the pillar radially facing the pillar provided with the resin injection gate having a cross-sectional area larger than those of the other resin injection gates among a plurality of the pillars not provided with the resin injection gate or the pillar in the vicinity of the pillar facing the pillar provided with the resin injection gate having a cross-sectional area larger than those of the other resin injection gates among the plurality of the pillars not provided with the resin injection gate. A cross-sectional area of a communicating portion of the resin reservoir which communicates with the pillar is smaller than the smallest of cross-sectional areas of a plurality of the resin injection gates.Type: GrantFiled: February 26, 2016Date of Patent: August 13, 2019Assignee: NSK LTD.Inventors: Yoshikazu Kuramoto, Nariaki Aihara, Takayuki Hiramoto
-
Publication number: 20190061212Abstract: The resin injection gate is disposed at the pillar part. When the bearing cage is divided into first and second regions by an imaginary line connecting the resin injection gate and a weld to be formed at a position radially facing the resin injection gate, a resin reservoir that can store therein the melted resin is formed at the pillar part in only one of the regions. A circumferential distance between the resin reservoir and the weld is smaller than a circumferential distance between the resin reservoir and the resin injection gate. A cross-sectional area of a communicating part of the resin reservoir, which is configured to communicate with the pillar part, is equal to or less than a quarter of a cross-sectional area of the resin injection gate.Type: ApplicationFiled: February 19, 2016Publication date: February 28, 2019Applicant: NSK LTD.Inventors: Yoshikazu KURAMOTO, Nariaki AIHARA, Takayuki HIRAMOTO
-
Publication number: 20190054673Abstract: A resin reservoir capable of storing the melted resin is provided in the pillar radially facing the pillar provided with the resin injection gate having a cross-sectional area larger than those of the other resin injection gates among a plurality of the pillars not provided with the resin injection gate or the pillar in the vicinity of the pillar facing the pillar provided with the resin injection gate having a cross-sectional area larger than those of the other resin injection gates among the plurality of the pillars not provided with the resin injection gate. A cross-sectional area of a communicating portion of the resin reservoir which communicates with the pillar is smaller than the smallest of cross-sectional areas of a plurality of the resin injection gates.Type: ApplicationFiled: February 26, 2016Publication date: February 21, 2019Applicant: NSK LTD.Inventors: Yoshikazu KURAMOTO, Nariaki AIHARA, Takayuki HIRAMOTO
-
Publication number: 20180056561Abstract: A bearing holder is to be formed by injecting a melted resin, from a plurality of resin injection gates provided at a peripheral edge portion of a substantially annular cavity formed in a molding die, into the cavity. At least one column portion is provided with a resin reservoir capable of reserving therein the melted resin. A cross-sectional area of a communication portion of the resin reservoir configured to communicate with the column portion is equal to or smaller than ΒΌ of a cross-sectional area of the resin injection gate.Type: ApplicationFiled: March 11, 2016Publication date: March 1, 2018Applicant: NSK LTD.Inventors: Yoshikazu KURAMOTO, Nariaki AIHARA, Takayuki HIRAMOTO
-
Patent number: 8303192Abstract: A resin snap cage 4 comprises a resin-made circular main part 10, a plurality of pockets 11 provided in one axial end face of the circular main part 10, and a circular reinforcing member 12 installed concentrically at the other end face in an axial direction of the circular main part 10. While this reinforcing member 12 is circular along the circular main part 10, a sectional shape in a plane parallel to an axial direction is a rectangle. The reinforcing member 12 is embedded in a recessed portion formed at the other end face in an axial direction of the circular main part 10 to be integrated, an outside diameter surface 12a, an inside diameter surface 12b, and a pocket-side surface 12c of the reinforcing member 12 are covered with the circular main part 10, and a surface 12d thereof opposite to the pocket side is exposed.Type: GrantFiled: November 20, 2006Date of Patent: November 6, 2012Assignee: NSK Ltd.Inventors: Takiyoshi Yamada, Takahiko Uchiyama, Kenichi Iso, Junji Ono, Masahiro Harunaga, Kinji Yukawa, Makoto Yasuda, Jianjun Zhan, Nariaki Aihara
-
Patent number: 7671582Abstract: The magnetic encoder is constituted by integrally bonding a magnet portion obtainable by forming a magnetic material containing a magnetic powder and a binder for the magnetic powder in a circular ring shape to a slinger. The binder contains at least a thermoplastic resin and an impact resistance-improving agent.Type: GrantFiled: May 9, 2006Date of Patent: March 2, 2010Assignee: NSK Ltd.Inventors: Toshikazu Yabe, Takeshi Murakami, Nariaki Aihara
-
Patent number: 7592798Abstract: A magnet portion 27 of a magnetic encoder 26 includes a magnetic member and a resin, and a highly reliable magnetic encoder 26 having a high magnetic property and enabling to detect a rotational number with high accuracy, and a hub unit bearing 2a are provided. Further, the resin is preferably a thermoplastic resin and further preferably includes a thermoplastic resin including a soft segment in a molecule. Further, the magnetic encoder 26 further includes a fixed member 25 attached with the magnet portion 27 and comprising a magnetic material, and the magnet portion 27 and the fixed member 25 are bonded by an adhering agent including at least one of a phenolic resin based and an epoxy resin based.Type: GrantFiled: January 18, 2005Date of Patent: September 22, 2009Assignee: NSK Ltd.Inventors: Toshikazu Yabe, Takeshi Murakami, Nariaki Aihara, Toshimi Takajo
-
Publication number: 20090220181Abstract: A resin snap cage 4 comprises a resin-made circular main part 10, a plurality of pockets 11 provided in one axial end face of the circular main part 10, and a circular reinforcing member 12 installed concentrically at the other end face in an axial direction of the circular main part 10. While this reinforcing member 12 is circular along the circular main part 10, a sectional shape in a plane parallel to an axial direction is a rectangle. The reinforcing member 12 is embedded in a recessed portion formed at the other end face in an axial direction of the circular main part 10 to be integrated, an outside diameter surface 12a, an inside diameter surface 12b, and a pocket-side surface 12c of the reinforcing member 12 are covered with the circular main part 10, and a surface 12d thereof opposite to the pocket side is exposed.Type: ApplicationFiled: November 20, 2006Publication date: September 3, 2009Applicant: NSK LTD.Inventors: Takiyoshi Yamada, Takahiko Uchiyama, Kenichi Iso, Junji Ono, Masahiro Harunaga, Kinji Yukawa, Makoto Yasuda, Jianjun Zhan, Nariaki Aihara
-
Publication number: 20080199118Abstract: The magnetic encoder is constituted by integrally bonding a magnet portion obtainable by forming a magnetic material containing a magnetic powder and a binder for the magnetic powder in a circular ring shape to a slinger. The binder contains at least a thermoplastic resin and an impact resistance-improving agent.Type: ApplicationFiled: May 9, 2006Publication date: August 21, 2008Applicant: NSK LTD.Inventors: Toshikazu Yabe, Takeshi Murakami, Nariaki Aihara
-
Publication number: 20070152657Abstract: A magnet portion 27 of a magnetic encoder 26 includes a magnetic member and a resin, and a highly reliable magnetic encoder 26 having a high magnetic property and enabling to detect a rotational number with high accuracy, and a hub unit bearing 2a are provided. Further, the resin is preferably a thermoplastic resin and further preferably includes a thermoplastic resin including a soft segment in a molecule. Further, the magnetic encoder 26 further includes a fixed member 25 attached with the magnet portion 27 and comprising a magnetic material, and the magnet portion 27 and the fixed member 25 are bonded by an adhering agent including at least one of a phenolic resin based and an epoxy resin based.Type: ApplicationFiled: January 18, 2005Publication date: July 5, 2007Inventors: Toshikazu Yabe, Takeshi Murakami, Nariaki Aihara, Toshimi Takajo
-
Patent number: 6639019Abstract: A rubber composition containing a tetrafluoroethylene-propylene bipolymer and from 0.02 to 10 parts by weight of a liquid polybutadiene per 100 parts by weight of the tetrafluoroethylene-propylene bipolymer and a rubber sealing device in which the rubber composition is joined to a reinforcing member are described, by which long-life rubber sealing devices which are highly tolerant to liquids containing amine-based additives, for example, soluble-type synthetic cutting coolants and engine oils suitable for high-speed processing and can sustain favorable sealing performance over a long period of time and rubber compositions appropriate therefor are provided.Type: GrantFiled: February 14, 2002Date of Patent: October 28, 2003Assignee: NSK Ltd.Inventors: Toshikazu Yabe, Takahiko Uchiyama, Nariaki Aihara, Keisuke Yokoyama
-
Patent number: 6592264Abstract: The present invention provides a rolling bearing having a prolonged life suitable for wheel, railway vehicle and steel rolling mill comprising a sealing member which exhibits fair sealing properties even under severe conditions. A rolling bearing comprising an outer ring having an outer raceway formed on the inner surface thereof, an inner ring having an inner raceway formed on the outer surface thereof, a plurality of rolling elements rollably provided between the outer ring and the inner ring, and a sealing member for sealing the axial opening of the space between the inner surface of the outer ring and the outer surface of the inner ring in which said rolling elements are provided, characterized in that the sealing member is formed by an elastic member made of a vulcanizable rubber composition obtained by blending a carboxylated acrylonitrile-butadiene rubber with at least carbon black.Type: GrantFiled: September 14, 2001Date of Patent: July 15, 2003Assignee: NSK Ltd.Inventors: Toshikazu Yabe, Takahiko Uchiyama, Keisuke Yokoyama, Nariaki Aihara
-
Patent number: 6572269Abstract: A linear guide apparatus includes a slider, a guide rail opposing the slider with a clearance provided therebetween, a plurality of rolling elements which are rotatably interposed there between, and a contact seal device for sealing an opening of the clearance. A side seal member of the contact seal device is made of a rubber material composition containing fluoro rubber. The rubber basically comprises at least one of copolymers that are vinylidenefluoride-tetrafluoroethylene-polypropylene terpolymer and tetrafluoroethylene-polypropylene copolymer.Type: GrantFiled: November 30, 2001Date of Patent: June 3, 2003Assignee: NSK Ltd.Inventors: Toshikazu Yabe, Takahiko Uchiyama, Keisuke Yokoyama, Nariaki Aihara
-
Publication number: 20030002759Abstract: The present invention provides a rolling bearing having a prolonged life suitable for wheel, railway vehicle and steel rolling mill comprising a sealing member which exhibits fair sealing properties even under severe conditions. A rolling bearing comprising an outer ring having an outer raceway formed on the inner surface thereof, an inner ring having an inner raceway formed on the outer surface thereof, a plurality of rolling elements rollably provided between the outer ring and the inner ring, and a sealing member for sealing the axial opening of the space between the inner surface of the outer ring and the outer surface of the inner ring in which said rolling elements are provided, characterized in that the sealing member is formed by an elastic member made of a vulcanizable rubber composition obtained by blending a carboxylated acrylonitrile-butadiene rubber with at least carbon black.Type: ApplicationFiled: September 14, 2001Publication date: January 2, 2003Applicant: NSK LTD.Inventors: Toshikazu Yabe, Takahiko Uchiyama, Keisuke Yokoyama, Nariaki Aihara
-
Publication number: 20020161127Abstract: A rubber composition containing a tetrafluoroethylene-propylene bipolymer and from 0.02 to 10 parts by weight of a liquid polybutadiene per 100 parts by weight of the tetrafluoroethylene-propylene bipolymer and a rubber sealing device in which the rubber composition is joined to a reinforcing member are described, by which long-life rubber sealing devices which are highly tolerant to liquids containing amine-based additives, for example, soluble-type synthetic cutting coolants and engine oils suitable for high-speed processing and can sustain favorable sealing performance over a long period of time and rubber compositions appropriate therefor are provided.Type: ApplicationFiled: February 14, 2002Publication date: October 31, 2002Applicant: NSK LTD.Inventors: Toshikazu Yabe, Takahiko Uchiyama, Nariaki Aihara, Keisuke Yokoyama
-
Patent number: RE48526Abstract: A magnet portion 27 of a magnetic encoder 26 includes a magnetic member and a resin, and a highly reliable magnetic encoder 26 having a high magnetic property and enabling to detect a rotational number with high accuracy, and a hub unit bearing 2a are provided. Further, the resin is preferably a thermoplastic resin and further preferably includes a thermoplastic resin including a soft segment in a molecule. Further, the magnetic encoder 26 further includes a fixed member 25 attached with the magnet portion 27 and comprising a magnetic material, and the magnet portion 27 and the fixed member 25 are bonded by an adhering agent including at least one of a phenolic resin based and an epoxy resin based.Type: GrantFiled: June 11, 2019Date of Patent: April 20, 2021Assignee: NSK LTD.Inventors: Toshikazu Yabe, Takeshi Murakami, Nariaki Aihara, Toshimi Takajo