Patents by Inventor Yasuhisa Terada
Yasuhisa Terada 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: 7186029Abstract: A rolling bearing for supporting a shaft on which a fan is provided, has an inner ring having an inner ring race on an outer surface thereof, an outer ring having an outer ring race on an inner surface thereof, balls provided between the inner ring race and the outer ring race and a retainer which keeps the balls apart each other in a circumferential direction, wherein an inner diameter of the bearing is set to be 3 mm or more and 17 mm or less, an outer diameter of the bearing is set to be 8 mm or more and 40 mm or less, when a thickness ti and a thickness te satisfies a relationship te?1.24 ti, and a residual austenite content in the inner ring is 7 wt % or less.Type: GrantFiled: August 29, 2003Date of Patent: March 6, 2007Assignee: NSK Ltd.Inventors: Kenji Takei, Yasuhisa Terada
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Patent number: 7077575Abstract: An outer ring 3a is formed so as to have a large thickness and the pitch circle diameters Dp of balls 6 are shifted to the inside diameter side of the present ball bearing. The radiuses of curvature Ro, Ri of the section shapes of an outer ring raceway 2a and an inner ring raceway 4a are increased with respect to the diameter Db of the balls 6. At the same time, the diameter Db of the balls 6 and the thickness of an inner ring 5a are not set excessively small to thereby be able not only to prevent Brinell impressions from being formed in the outer ring raceway 2a but also to prevent the inner ring 5a from being damaged or cracked.Type: GrantFiled: April 2, 2004Date of Patent: July 18, 2006Assignee: NSK Ltd.Inventors: Takayuki Yatabe, Hisato Yamamoto, Yasuhisa Terada, Takashi Ogawa, Tsuyoshi Koshi, Hiroya Achiha, Shoji Noguchi
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Patent number: 7029181Abstract: A rolling bearing lubricated with a grease includes an outer ring, an inner ring, a plurality of rolling elements disposed between respective rolling raceway tracks of the outer ring and the inner ring, and a retainer having a plurality of pockets for locking the rolling elements to freely roll and formed of resin material. In the rolling bearing, the radial clearance gap ratio of the pockets of the retainer is set to 0??r/Da?0.09, and the axial clearance gap ratio of the pockets is set to 0??a/Da?0.06 when the kinematic viscosity of base oil at 40° C. of the grease is 10 to 40 mm2/sec, being set to 0??a/Da?0.05 when the kinematic viscosity of base oil is 10 to 90 mm2/sec, being set to 0??a/Da?0.025 when the kinematic viscosity of base oil is 10 to 160 mm2/sec.Type: GrantFiled: March 4, 2004Date of Patent: April 18, 2006Assignee: NSK Ltd.Inventors: Yasuhisa Terada, Kenji Takei, Michiharu Naka
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Publication number: 20050254740Abstract: A rolling bearing for supporting a shaft on which a fan is provided, has an inner ring having an inner ring race on an outer surface thereof, an outer ring having an outer ring race on an inner surface thereof, balls provided between the inner ring race and the outer ring race and a retainer which keeps the balls apart each other in a circumferential direction, wherein an inner diameter of the bearing is set to be 3 mm or more and 17 mm or less, an outer diameter of the bearing is set to be 8 mm or more and 40 mm or less, when a thickness ti and a thickness te satisfies a relationship te?1.24 ti, and a residual austenite content in the inner ring is 7 wt % or less.Type: ApplicationFiled: August 29, 2003Publication date: November 17, 2005Inventors: Kenji Takei, Yasuhisa Terada
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Publication number: 20050196086Abstract: A rolling bearing lubricated with a grease includes an outer ring, an inner ring, a plurality of rolling elements disposed between respective rolling raceway tracks of the outer ring and the inner ring, and a retainer having a plurality of pockets for locking the rolling elements to freely roll and formed of resin material. In the rolling bearing, the radial clearance gap ratio of the pockets of the retainer is set to 0??r/Da?0.09, and the axial clearance gap ratio of the pockets is set to 0??a/Da?0.06 when the kinematic viscosity of base oil at 40° C. of the grease is 10 to 40 mm2/sec, being set to 0??a/Da?0.05 when the kinematic viscosity of base oil is 10 to 90 mm2/sec, being set to 0??a/Da?0.025 when the kinematic viscosity of base oil is 10 to 160 mm2/sec.Type: ApplicationFiled: March 4, 2004Publication date: September 8, 2005Inventors: Yasuhisa Terada, Kenji Takei, Michiharu Naka
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Publication number: 20050074192Abstract: An outer ring 3a is formed so as to have a large thickness and the pitch circle diameters Dp of balls 6 are shifted to the inside diameter side of the present ball bearing. The radiuses of curvature Ro, Ri of the section shapes of an outer ring raceway 2a and an inner ring raceway 4a are increased with respect to the diameter Db of the balls 6. At the same time, the diameter Db of the balls 6 and the thickness of an inner ring 5a are not set excessively small to thereby be able not only to prevent Brinell impressions from being formed in the outer ring raceway 2a but also to prevent the inner ring 5a from being damaged or cracked.Type: ApplicationFiled: April 2, 2004Publication date: April 7, 2005Inventors: Takayuki Yatabe, Hisato Yamamoto, Yasuhisa Terada, Takashi Ogawa, Tsuyoshi Koshi, Hiroya Achiha, Shoji Noguchi
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Patent number: 6719458Abstract: An outer ring 3a is formed so as to have a large thickness and the pitch circle diameters Dp of balls 6 are shifted to the inside diameter side of the present ball bearing. The radiuses of curvature Ro, Ri of the section shapes of an outer ring raceway 2a and an inner ring raceway 4a are increased with respect to the diameter Db of the balls 6. At the same time, the diameter Db of the balls 6 and the thickness of an inner ring 5a are not set excessively small to thereby be able not only to prevent Brinell impressions from being formed in the outer ring raceway 2a but also to prevent the inner ring 5a from being damaged or cracked.Type: GrantFiled: December 20, 2002Date of Patent: April 13, 2004Assignee: NSK Ltd.Inventors: Takayuki Yatabe, Hisato Yamamoto, Yasuhisa Terada, Takashi Ogawa, Tsuyoshi Koshi, Hiroya Achiha, Shoji Noguchi
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Patent number: 6682223Abstract: A ball bearing is described, which comprises an outer ring having on its inner periphery an outer raceway, an inner ring having on its outer periphery an inner raceway, plural balls rotatably disposed between the outer raceway and the inner raceway, a cage holding the plural balls in a freely rotatable manner, and a grease packed in a space between the outer raceway and the inner raceway, wherein the inner peripheral surface of each pocket of the cage contains a spherical part consisting of a spherical concave surface whose radius of curvature is slightly larger than that of each ball and a curved part which has the radius of curvature being larger than that of the spherical part and is smoothly continuous from the end of the spherical part toward the end thereof on the opening side of the pocket.Type: GrantFiled: March 28, 2002Date of Patent: January 27, 2004Assignee: NSK Ltd.Inventors: Youichiro Sugimori, Yasushi Mutoh, Michiharu Naka, Takashi Ogawa, Yasuhisa Terada, Hiroshi Ishiwada
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Patent number: 6648517Abstract: The pocket surface of a pocket with a ball stored therein has a pair of first pocket surfaces respectively formed inside a pair of pawls and a second pocket surface situated between the two first pocket surfaces. The second pocket surface is formed as a spherical-shaped concave surface having a radius of curvature the center of curvature of which is the rotation center of the ball in a no-load state. Each of the first pocket surfaces has a center of curvature shifted from the center of curvature of the second pocket surface toward the opposite side to the entrance (opening) of the pocket by an axially shifting quantity h1, and each of the first pocket surfaces is formed, starting from the present center of curvature, as a spherical-shaped concave surface with its radius of curvature set larger than the radius of curvature of the second pocket surface.Type: GrantFiled: December 4, 2001Date of Patent: November 18, 2003Assignee: NSK Ltd.Inventors: Hiroshi Ishiwada, Yasushi Mutoh, Banda Noda, Tatsunobu Momono, Magozou Hamamoto, Yasuhisa Terada
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Publication number: 20030103703Abstract: The pocket surface of a pocket with a ball stored therein has a pair of first pocket surfaces respectively formed inside a pair of pawls and a second pocket surface situated between the two first pocket surfaces. The second pocket surface is formed as a spherical-shaped concave surface having a radius of curvature the center of curvature of which is the rotation center of the ball in a no-load state. Each of the first pocket surfaces has a center of curvature shifted from the center of curvature of the second pocket surface toward the opposite side to the entrance (opening) of the pocket by an axially shifting quantity h1, and each of the first pocket surfaces is formed, starting from the present center of curvature, as a spherical-shaped concave surface with its radius of curvature set larger than the radius of curvature of the second pocket surface.Type: ApplicationFiled: December 4, 2001Publication date: June 5, 2003Applicant: NSK LTD.Inventors: Hiroshi Ishiwada, Yasushi Mutoh, Banda Noda, Tatsunobu Momono, Magozou Hamamoto, Yasuhisa Terada
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Patent number: 6568856Abstract: A rolling bearing to exhibit outstanding initial (cage) acoustic characteristics at the start of operation under a low temperature atmosphere, suppress fretting damages (abrasions) and reduce bearing torque by making the radius of curvature of the cross-sectional shape of the inner raceway and the radius of curvature of the cross-sectional shape of the outer raceway equal to 51.0% to smaller than 60.0% of the diameter of the rolling element, and packing a grease composition comprising a base oil that is a mixture of a lubricant containing a polar group in its molecular structure and a non-polar lubricant and a metallic soap-based thickener containing a long-fiber material with a major axis part length of at least 3 &mgr;m.Type: GrantFiled: December 3, 2001Date of Patent: May 27, 2003Assignee: NSK Ltd.Inventors: Youichiro Sugimori, Hisao Sumiya, Michiharu Naka, Takashi Ogawa, Yasuhisa Terada
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Publication number: 20030086629Abstract: An outer ring 3a is formed so as to have a large thickness and the pitch circle diameters Dp of balls 6 are shifted to the inside diameter side of the present ball bearing. The radiuses of curvature Ro, Ri of the section shapes of an outer ring raceway 2a and an inner ring raceway 4a are increased with respect to the diameter Db of the balls 6. At the same time, the diameter Db of the balls 6 and the thickness of an inner ring 5a are not set excessively small to thereby be able not only to prevent Brinell impressions from being formed in the outer ring raceway 2a but also to prevent the inner ring 5a from being damaged or cracked.Type: ApplicationFiled: December 20, 2002Publication date: May 8, 2003Applicant: NSK LTD.Inventors: Takayuki Yatabe, Hisato Yamamoto, Yasuhisa Terada, Takashi Ogawa, Tsuyoshi Koshi, Hiroya Achiha, Shoji Noguchi
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Publication number: 20030077015Abstract: A ball bearing is described, which comprises an outer ring having on its inner periphery an outer raceway, an inner ring having on its outer periphery an inner raceway, plural balls rotatably disposed between the outer raceway and the inner raceway, a cage holding the plural balls in a freely rotatable manner, and a grease packed in a space between the outer raceway and the inner raceway, wherein the inner peripheral surface of each pocket of the cage contains a spherical part consisting of a spherical concave surface whose radius of curvature is slightly larger than that of each ball and a curved part which has the radius of curvature being larger than that of the spherical part and is smoothly continuous from the end of the spherical part toward the end thereof on the opening side of the pocket.Type: ApplicationFiled: March 28, 2002Publication date: April 24, 2003Applicant: NSK LTD.Inventors: Youichiro Sugimori, Yasushi Mutoh, Michiharu Naka, Takashi Ogawa, Yasuhisa Terada, Hiroshi Ishiwada
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Patent number: 6524008Abstract: An outer ring 3a is formed so as to have a large thickness and the pitch circle diameters Dp of balls 6 are shifted to the inside diameter side of the present ball bearing. The radiuses of curvature Ro, Ri of the section shapes of an outer ring raceway 2a and an inner ring raceway 4a are increased with respect to the diameter Db of the balls 6. At the same time, the diameter Db of the balls 6 and the thickness of an inner ring 5a are not set excessively small to thereby be able not only to prevent Brinell impressions from being formed in the outer ring raceway 2a but also to prevent the inner ring 5a from being damaged or cracked.Type: GrantFiled: July 19, 2000Date of Patent: February 25, 2003Assignee: NSK, Ltd.Inventors: Takayuki Yatabe, Hisato Yamamoto, Yasuhisa Terada, Takashi Ogawa, Tsuyoshi Koshi, Hiroya Achiha, Shoji Noguchi
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Publication number: 20030012470Abstract: A rolling bearing to exhibit outstanding initial (cage) acoustic characteristics at the start of operation under a low temperature atmosphere, suppress fretting damages (abrasions) and reduce bearing torque by making the radius of curvature of the cross-sectional shape of the inner raceway and the radius of curvature of the cross-sectional shape of the outer raceway equal to 51.0% to smaller than 60.0% of the diameter of the rolling element, and packing a grease composition comprising a base oil that is a mixture of a lubricant containing a polar group in its molecular structure and a non-polar lubricant and a metallic soap-based thickener containing a long-fiber material with a major axis part length of at least 3 &mgr;m.Type: ApplicationFiled: December 3, 2001Publication date: January 16, 2003Applicant: NSK LTD.Inventors: Youichiro Sugimori, Hisao Sumiya, Michiharu Naka, Takashi Ogawa, Yasuhisa Terada
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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