Patents by Inventor Kouichi Hachiya
Kouichi Hachiya 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: 7234872Abstract: A rolling bearing includes a plurality of rolling elements movably retained at almost the same interval between an inner ring and an outer ring with a cage made of synthetic resin provided interposed therebetween. The rolling bearing further includes, an oil film made of a lubricant, and a grease containing a synthetic oil as a base oil enclosed therein. The lubricant contains at least one additive selected from the group consisting of organic aliphatic acid, organic aliphatic acid derivative and organic phosphorus compound incorporated in a synthetic oil in a proportion of from 0.5 to 10% by weight formed on the surface of the raceways of the inner and outer rings and the surface of the rolling elements, and a grease containing a synthetic oil as a base oil enclosed therein.Type: GrantFiled: May 31, 2002Date of Patent: June 26, 2007Assignee: NSK, Ltd.Inventors: Yasunobu Fujita, Masao Yamamoto, Kouichi Hachiya, Atsushi Yokouchi, Toshikazu Yabe, Emiko Shiraishi, Michiharu Naka
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Patent number: 6880978Abstract: A rolling bearing for an HDD being excellent in the resistance to fretting wear, capable of lowering the torque and relieving the torque change and having a long life while exerting no undesirable effect on various bearing properties. A rolling bearing for hard disk drives wherein a cage 7 supports a plural number of rolling elements 5 located between an inner ring 2 and an outer ring 4 and sealing members 6,6 fixed to the both ends in the axial direction of one of said inner ring 2 and said outer ring 4 are opposite to each other, wherein a lubricating oil has been injected into the bearing space formed between said sealing members 6,6 at the both ends in the axial direction so as to amount to 1 to 50% by volume of the bearing space.Type: GrantFiled: January 22, 2002Date of Patent: April 19, 2005Assignee: NSK Ltd.Inventors: Yasunobu Fujita, Masao Yamamoto, Kouichi Hachiya, Atsushi Yokouchi, Toshikazu Yabe, Emiko Shiraishi, Michiharu Naka
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Publication number: 20030081871Abstract: A rolling bearing includes a plurality of rolling elements movably retained at almost the same interval between an inner ring and an outer ring with a cage made of synthetic resin provided interposed therebetween. The rolling bearing further includes, an oil film made of a lubricant, and a grease containing a synthetic oil as a base oil enclosed therein. The lubricant contains at least one additive selected from the group consisting of organic aliphatic acid, organic aliphatic acid derivative and organic phosphorus compound incorporated in a synthetic oil in a proportion of from 0.5 to 10% by weight formed on the surface of the raceways of the inner and outer rings and the surface of the rolling elements, and a grease containing a synthetic oil as a base oil enclosed therein.Type: ApplicationFiled: May 31, 2002Publication date: May 1, 2003Applicant: NSK LTD.Inventors: Yasunobu Fujita, Masao Yamamoto, Kouichi Hachiya, Atsushi Yokouchi, Toshikazu Yabe, Emiko Shiraishi, Michiharu Naka
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Publication number: 20030040442Abstract: The invention aims to provide a rolling bearing that secures a sufficient bearing life economically even when used under such conditions that water from the outside or water formed by moisture condensation may seep into the lubricant or the bearing is affected by the vibrations, and particularly a rolling bearing suited to the electric parts and accessaries of au automobile engine, such as an alternator. To accomplish the object, the hydrogen ion exponent pH of the grease sealed into the inside of the bearing is adjusted in a range of from 7 to 13. For the same purpose, the hydrogen ion exponent pH of the grease is adjusted in a range of from 5 to 13 where a prescribed amount of an organic metal salt or ADTC is added to the grease, where a prescribed amount of an inorganic compound having an average particle size of 2 □m or smaller is added to the grease, or where a diurea compound containing an aromatic amine or a mixture of the diurea compound is added to the grease as a thickener.Type: ApplicationFiled: March 7, 2002Publication date: February 27, 2003Applicant: NSK LTD.Inventors: Atsushi Yokouchi, Youichi Matsumoto, Kenichi Iso, Kouichi Hachiya, Hideki Koizumi, Michiharu Naka
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Publication number: 20020097933Abstract: A rolling bearing for an HDD being excellent in the resistance to fretting wear, capable of lowering the torque and relieving the torque change and having a long life while exerting no undesirable effect on various bearing properties. A rolling bearing for hard disk drives wherein a cage 7 supports a plural number of rolling elements 5 located between an inner ring 2 and an outer ring 4 and sealing members 6,6 fixed to the both ends in the axial direction of one of said inner ring 2 and said outer ring 4 are opposite to each other, wherein a lubricating oil has been injected into the bearing space formed between said sealing members 6,6 at the both ends in the axial direction so as to amount to 1 to 50% by volume of the bearing space.Type: ApplicationFiled: January 22, 2002Publication date: July 25, 2002Applicant: NSK LTD.Inventors: Yasunobu Fujita, Masao Yamamoto, Kouichi Hachiya, Atsushi Yokouchi, Toshikazu Yabe, Emiko Shiraishi, Michiharu Naka
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Patent number: 6340244Abstract: A rolling bearing for an HDD being excellent in the resistance to fretting wear, capable of lowering the torque and relieving the torque change and having a long life while exerting no undesirable effect on various bearing properties. A rolling bearing for hard disk drives wherein a cage 7 supports a plural number of rolling elements 5 located between an inner ring 2 and an outer ring 4 and sealing members 6,6 fixed to the both ends in the axial direction of one of said inner ring 2 and said outer ring 4 are opposite to each other, wherein a lubricating oil has been injected into the bearing space formed between said sealing members 6,6 at the both ends in the axial direction so as to amount to 1 to 50% by volume of the bearing space.Type: GrantFiled: June 5, 1998Date of Patent: January 22, 2002Assignee: NSK Ltd.Inventors: Yasunobu Fujita, Masao Yamamoto, Kouichi Hachiya, Atsushi Yokouchi, Toshikazu Yabe, Emiko Shiraishi, Michiharu Naka