Patents by Inventor Toshimi Takajo
Toshimi Takajo 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).
-
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
-
Patent number: 7537392Abstract: The present invention provides a rolling bearing which comprises a retainer that can be used without any deformation at high temperatures and fairly assembled to bearing and thus can be used under severe working conditions such as high temperature, high rotary speed and high load over an extended period of time. A novel rolling bearing is provided comprising a retainer made of a resin composition having a flexural modulus of at least 3,500 MPa at 180° C. and a heat-resistant temperature of at least 150° C.Type: GrantFiled: February 17, 2005Date of Patent: May 26, 2009Assignee: NSK Ltd.Inventors: Magozou Hamamoto, Toshihisa Ohata, Koichi Goto, Toshimi Takajo
-
Patent number: 7360468Abstract: An electric power steering device having a resin gear used in a speed reduction gear mechanism and the resin gear used for the device are provided. The speed reduction gear mechanism includes a driven gear that is the resin gear integrally formed by fitting a resin part having gear teeth formed on the outer peripheral surface thereof to the outside of a metal core and a drive gear meshed with the driven gear. The resin part of the resin gear is formed of a resin composition having, as a base resin, a polyamide resin containing 10 to 50% by weight of glass fiber of 5 to 9 ?m in diameter, and has excellent wear resistance, durability, and dimensional stability. Grease on the meshed surfaces of the gears has such a composition that includes a thickener and 3 to 10% by weight of a wax having a melting point or softening point in the range of 70 to 130° C. in a base oil formed mainly of at least one oil selected from mineral oil, poly ?-olefin oil, and alkyl polyphenyl ether.Type: GrantFiled: March 18, 2004Date of Patent: April 22, 2008Assignee: NSK Ltd.Inventors: Toshikazu Yabe, Takeshi Murakami, Toshimi Takajo
-
Patent number: 7264249Abstract: A hub unit including a hub and a flange integrally formed with the hub, and a seal including a core metal and an elastic body integrally molded with the core metal. The elastic body includes one or more lips in sliding contact with one or both of the hub and the flange. The elastic body includes a molded rubber, wherein the molded rubber contains, as a raw rubber, acrylonitrile/butadiene rubber having an acrylonitrile monomer content of from 26 to 36% by weight. In a first embodiment, the hub unit includes a hub adapted for receiving a shaft and a flange integrally formed with the hub, and the seal is attached to an outer circumference of the hub unit. In a second embodiment, the hub unit includes an inner ring having a raceway surface for receiving rolling elements and an outer ring. The seal seals the space between the inner ring and the outer ring. Furthermore, the seal includes a radial lip in sliding contact with an outer circumferential surface of the hub.Type: GrantFiled: October 15, 2004Date of Patent: September 4, 2007Assignee: NSK, Ltd.Inventors: Keisuke Yokoyama, Takahiko Uchiyama, Toshikazu Yabe, Toshimi Takajo
-
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
-
Publication number: 20060175123Abstract: An electric power steering device having a resin gear used in a speed reduction gear mechanism and the resin gear used for the device are provided. The speed reduction gear mechanism includes a driven gear that is the resin gear integrally formed by fitting a resin part having gear teeth formed on the outer peripheral surface thereof to the outside of a metal core and a drive gear meshed with the driven gear. The resin part of the resin gear is formed of a resin composition having, as a base resin, a polyamide resin containing 10 to 50% by weight of glass fiber of 5 to 9 ?m in diameter, and has excellent wear resistance, durability, and dimensional stability. Grease on the meshed surfaces of the gears has such a composition that includes a thickener and 3 to 10% by weight of a wax having a melting point or softening point in the range of 70 to 130° C. in a base oil formed mainly of at least one oil selected from mineral oil, poly ?-olefin oil, and alkyl polyphenyl ether.Type: ApplicationFiled: March 18, 2004Publication date: August 10, 2006Inventors: Toshikazu Yabe, Takeshi Murakami, Toshimi Takajo
-
Patent number: 6926447Abstract: The present invention provides a rolling bearing which comprises a retainer that can be used without any deformation at high temperatures and fairly assembled to bearing and thus can be used under severe working conditions such as high temperature, high rotary speed and high load over an extended period of time. A novel rolling bearing is provided comprising a retainer made of a resin composition having a flexural modulus of at least 3,500 MPa at 180° C. and a heat-resistant temperature of at least 150° C.Type: GrantFiled: July 5, 2001Date of Patent: August 9, 2005Assignee: NSK Ltd.Inventors: Magozou Hamamoto, Toshihisa Ohata, Koichi Goto, Toshimi Takajo
-
Publication number: 20050169565Abstract: The present invention provides a rolling bearing which comprises a retainer that can be used without any deformation at high temperatures and fairly assembled to bearing and thus can be used under severe working conditions such as high temperature, high rotary speed and high load over an extended period of time. A novel rolling bearing is provided comprising a retainer made of a resin composition having a flexural modulus of at least 3,500 MPa at 180° C. and a heat-resistant temperature of at least 150° C.Type: ApplicationFiled: February 17, 2005Publication date: August 4, 2005Inventors: Magozou Hamamoto, Toshihisa Ohata, Koichi Goto, Toshimi Takajo
-
Publication number: 20050046115Abstract: A seal 1 having one or more lips 13 constituted of a molded rubber is described, wherein the lips 13 (the whole elastic body 3) have been formed so as to have a maximum value of loss tangent (tan ?) of 0.40 or smaller in the temperature range of from 20 to 70° C.Type: ApplicationFiled: October 15, 2004Publication date: March 3, 2005Inventors: Keisuke Yokoyama, Takahiko Uchiyama, Toshikazu Yabe, Toshimi Takajo
-
Publication number: 20040179757Abstract: The present invention is to offer a rubber material composition excellent in an abrasion resistance and less to cause heat by friction, and is suitably used to sealing members of rolling devices to be used with grease lubrication under severe circumstances allowing water or dusts to much exist. The rubber material composition is fabricated with carboxylated acrylonitrile-butadiene rubber.Type: ApplicationFiled: March 19, 2004Publication date: September 16, 2004Applicant: NSK LTD.Inventors: Toshikazu Yabe, Toshimi Takajo, Takahiko Uchiyama, Keisuke Yokoyama
-
Patent number: 6715922Abstract: A rolling bearing with the sealing device which has a fitting groove and sealing device with a mounting portion. The fitting groove formed on the inner peripheral surface of an outer ring. An outside surface of the fitting groove tilts at 5 to 30 degrees with respect to an radial direction of the bearing. An inside surface of the fitting groove tilts at a tilt angle smaller than that of the outside surface. A total of these tilt angles is 35 degrees or more. The mounting portion has a base portion contacting the inside surface and a portion projecting toward the outside surface of the fitting groove from the base portion, and the mounting portion is thinnest at a front end portion of the projecting portion.Type: GrantFiled: November 16, 2001Date of Patent: April 6, 2004Assignee: NSK Ltd.Inventors: Hiromitsu Asai, Toshimi Takajo, Takahiko Uchiyama, Takashi Ogawa, Yoshinori Tanaka
-
Publication number: 20030127803Abstract: A seal 1 having one or more lips 13 constituted of a molded rubber is described, wherein the lips 13 (the whole elastic body 3) have been formed so as to have a maximum value of loss tangent (tan &dgr;) of 0.40 or smaller in the temperature range of from 20 to 70° C.Type: ApplicationFiled: July 19, 2002Publication date: July 10, 2003Applicant: NSK LTD.Inventors: Keisuke Yokoyama, Takahiko Uchiyama, Toshikazu Yabe, Toshimi Takajo
-
Publication number: 20020097934Abstract: A rolling bearing with the sealing device which has a fitting groove and sealing device with a mounting portion. The fitting groove formed on the inner peripheral surface of an outer ring. An outside surface of the fitting groove tilts at 5 to 30 degrees with respect to an radial direction of the bearing. An inside surface of the fitting groove tilts at a tilt angle smaller than that of the outside surface. A total of these tilt angles is 35 degrees or more. The mounting portion has a base portion contacting the inside surface and a portion projecting toward the outside surface of the fitting groove from the base portion, and the mounting portion is thinnest at a front end portion of the projecting portion.Type: ApplicationFiled: November 16, 2001Publication date: July 25, 2002Applicant: NSK LTD.Inventors: Hiromitsu Asai, Toshimi Takajo, Takahiko Uchiyama, Takashi Ogawa, Yoshinori Tanaka
-
Publication number: 20020061961Abstract: The present invention is to offer a rubber material composition excellent in an abrasion resistance and less to cause heat by friction, and is suitably used to sealing members of rolling devises to be used with grease lubrication under severe circumstances allowing water or dusts to much exist. The rubber material composition is fabricated with carboxylated acrylonitrile-butadiene rubber.Type: ApplicationFiled: September 14, 2001Publication date: May 23, 2002Applicant: NSK LTD.Inventors: Toshikazu Yabe, Toshimi Takajo, Takahiko Uchiyama, Keisuke Yokoyama
-
Publication number: 20020061151Abstract: The present invention provides a rolling bearing which comprises a retainer that can be used without any deformation at high temperatures and fairly assembled to bearing and thus can be used under severe working conditions such as high temperature, high rotary speed and high load over an extended period of time. A novel rolling bearing is provided comprising a retainer made of a resin composition having a flexural modulus of at least 3,500 MPa at 180° C. and a heat-resistant temperature of at least 150° C.Type: ApplicationFiled: July 5, 2001Publication date: May 23, 2002Applicant: NSK LTD.Inventors: Magozou Hamamoto, Toshihisa Ohata, Koichi Goto, Toshimi Takajo
-
Patent number: 6334615Abstract: The present invention provides a seal for rolling bearings having improved sealing properties, undergoing no separation between a core and a peripheral portion nor deformation even in long-term use. The seal comprises a flexible resin portion which comes into contact with an outer race and a rigid resin portion which is more rigid than the flexible resin portion, the rigid resin portion and the flexible resin portion being fusion bonded together into an integral body.Type: GrantFiled: March 17, 1998Date of Patent: January 1, 2002Assignee: NSK Ltd.Inventors: Takahiko Uchiyama, Fumio Ueki, Magozou Hamamoto, Toshimi Takajo
-
Patent number: 5961222Abstract: An anti-electrolytic corrosion rolling bearing having at least an outer race, an inner race, and rolling elements interposed between the outer and inner races, which has an insulating body on at least one of the outer peripheral surface of the outer race, the inner peripheral surface of the inner race, and the side surfaces of the outer race and inner race, said insulating body being composed of an insulating film or insulating member each containing at least one of a thermoplastic synthetic resin, a rubber, and a thermoplastic elastomer as a base material and having a resistivity of not less than 1.times.10.sup.13 .OMEGA..multidot.cm and a thermal conductivity of not less than 0.5 W/m.multidot.K.Type: GrantFiled: November 7, 1997Date of Patent: October 5, 1999Assignee: NSK Ltd.Inventors: Toshikazu Yabe, Toshimi Takajo, Fumio Ueki, Takahiko Uchiyama, Shigeaki Abe, Takanori Yamada, Magozou Hamamoto, Kiyotoshi Ueda, Yasuhisa Terada, Yukio Ohura
-
Patent number: 5769543Abstract: In a linear guide apparatus including an axially extending guide rail, a slider engaged with the guide rail, and a plurality of rolling elements loaded into the slider, the linear guide apparatus further includes a sealing device fixed to the slider in slidable contact with the guide rail for sealing a clearance existing between the guide rail and the slider, in which the sealing device includes: a lubricant-containing polymer member formed of a synthetic resin containing a lubricant, and having a contact portion contacting with the guide rail to surround the guide rail, both wing portions, a connecting portion connecting the wing portions to be C-shaped substantially, and a pair of first recesses formed in the respective wing portions for fixing the lubricant-containing polymer member to the slider; a first plate member fitted to the lubricant-containing polymer member opposed to the slider; and a pair of first cylindrical members inserted to the respective first recesses.Type: GrantFiled: October 11, 1996Date of Patent: June 23, 1998Assignee: NSK Ltd.Inventors: Toru Tsukada, Yutaka Igarashi, Soichiro Kato, Toshikazu Yabe, Fumio Ueki, Toshimi Takajo
-
Patent number: 5695198Abstract: In a seal for a rolling bearing, the seal has a molding member formed from a rubber material, the molding member including a lip portion, the molding member having 0.3 to 5.0 MPa of tensile stress at 10% strain and no less than 50% of elongation at break after the rubber material is subjected to an accelerated air aging at 130.degree. C. for 1000 hours. The rubber material includes the nitrile rubber compound containing a raw-material rubber, with respect to 100 weight parts of the raw-material rubber, 0.3 to 5.0 weight parts of an age resistor, and 0.3 to 5.0 weight parts of at least one secondary age resistor. The seal prevents grease enclosed in the rolling bearing from leaking out, the lip portion from being broken, and dust resistance from being lowered even in the case where the rolling bearing is used in a high-temperature environment.Type: GrantFiled: May 13, 1996Date of Patent: December 9, 1997Assignee: NSK Ltd.Inventors: Akira Iwamoto, Norihiro Aoki, Kenji Okuma, Takahiko Uchiyama, Toshimi Takajo, Toshikazu Yabe
-
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