Patents by Inventor Eiichi Nakamizo
Eiichi Nakamizo 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: 10408267Abstract: A tapered roller bearing (31a) has a plurality of retainer segments (11a, 11d) each having a pocket to house a tapered roller (34a), and arranged so as to be continuously lined with each other in a circumferential direction between an outer ring (32a) and an inner ring (33a). The retainer segment (11a, 11d) is formed of a resin containing a filler material to lower a thermal linear expansion coefficient. In addition, a clearance (39a) is provided between the first retainer segment (11a) and the last retainer segment (11d) after the plurality of retainer segments (11a, 11d) have been arranged in the circumferential direction without providing any clearance. Here a circumferential range (R) of the clearance (39a) is larger than 0.075% of a circumference of a circle passing through a center of the retainer segment (11a, 11d) and smaller than 0.12% thereof at room temperature.Type: GrantFiled: September 22, 2017Date of Patent: September 10, 2019Assignee: NTN CORPORATIONInventors: Tatsuya Omoto, Eiichi Nakamizo, Tomoya Sakaguchi
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Patent number: 10190576Abstract: A roller bearing comprises an outer ring, an inner ring, a plurality of rollers arranged between said outer ring and said inner ring; and a plurality of retainer segments having a plurality of column parts extending in a direction along a shaft so as to form a pocket for holding said roller. A connection part extends in a circumferential direction so as to connect the plurality of column parts, and continuously lined with each other in the circumferential direction between said outer ring and said inner ring, in which a corner of a circumferential end face is chamfered. Also provided is a spacer arranged between the circumferentially arranged first retainer segment and last retainer segment, wherein a chamfered part is provided at a corner of a circumferential spacer end face of the space. The roller bearing can be used in a main shaft support structure of a wind-power generator.Type: GrantFiled: July 6, 2017Date of Patent: January 29, 2019Assignee: NTN CORPORATIONInventors: Tatsuya Omoto, Shoichi Hioki, Mitsuo Sasabe, Eiichi Nakamizo, Tomoya Sakaguchi
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Publication number: 20180010639Abstract: A tapered roller bearing (31a) has a plurality of retainer segments (11a, 11d) each having a pocket to house a tapered roller (34a), and arranged so as to be continuously lined with each other in a circumferential direction between an outer ring (32a) and an inner ring (33a). The retainer segment (11a, 11d) is formed of a resin containing a filler material to lower a thermal linear expansion coefficient. In addition, a clearance (39a) is provided between the first retainer segment (11a) and the last retainer segment (11d) after the plurality of retainer segments (11a, 11d) have been arranged in the circumferential direction without providing any clearance. Here a circumferential range (R) of the clearance (39a) is larger than 0.075% of a circumference of a circle passing through a center of the retainer segment (11a, 11d) and smaller than 0.12% thereof at room temperature.Type: ApplicationFiled: September 22, 2017Publication date: January 11, 2018Inventors: Tatsuya OMOTO, Eiichi NAKAMIZO, Tomoya SAKAGUCHI
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Patent number: 9810263Abstract: A tapered roller bearing (31a) has a plurality of retainer segments (11a, 11d) each having a pocket to house a tapered roller (34a), and arranged so as to be continuously lined with each other in a circumferential direction between an outer ring (32a) and an inner ring (33a). The retainer segment (11a, 11d) is formed of a resin containing a filler material to lower a thermal linear expansion coefficient. In addition, a clearance (39a) is provided between the first retainer segment (11a) and the last retainer segment (11d) after the plurality of retainer segments (11a, 11d) have been arranged in the circumferential direction without providing any clearance. Here a circumferential range (R) of the clearance (39a) is larger than 0.075% of a circumference of a circle passing through a center of the retainer segment (11a, 11d) and smaller than 0.12% thereof at room temperature.Type: GrantFiled: May 16, 2014Date of Patent: November 7, 2017Assignee: NTN CORPORATIONInventors: Tatsuya Omoto, Eiichi Nakamizo, Tomoya Sakaguchi
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Publication number: 20170306929Abstract: A roller bearing comprises an outer ring, an inner ring, a plurality of rollers arranged between said outer ring and said inner ring; and a plurality of retainer segments having a plurality of column parts extending in a direction along a shaft so as to form a pocket for holding said roller. A connection part extends in a circumferential direction so as to connect the plurality of column parts, and continuously lined with each other in the circumferential direction between said outer ring and said inner ring, in which a corner of a circumferential end face is chamfered. Also provided is a spacer arranged between the circumferentially arranged first retainer segment and last retainer segment, wherein a chamfered part is provided at a corner of a circumferential spacer end face of the space. The roller bearing can be used in a main shaft support structure of a wind-power generator.Type: ApplicationFiled: July 6, 2017Publication date: October 26, 2017Inventors: Tatsuya OMOTO, Shoichi HIOKI, Mitsuo SASABE, Eiichi NAKAMIZO, Tomoya SAKAGUCHI
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Patent number: 9732734Abstract: A roller bearing comprises an outer ring, an inner ring, a plurality of rollers arranged between the outer ring and the inner ring, and a plurality of retainer segments having a plurality of column parts extending in a direction along a shaft so as to form a pocket for holding the roller, and connection parts and extending in a circumferential direction to connect the plurality of column parts, and continuously lined with each other in the circumferential direction between the outer ring and the inner ring. The column part is positioned at an circumferential end of the retainer segment. Here, a circumferential outer side end face of the column part positioned at the end is flat, and a circumferential inner side end face of the column part positioned at said end is provided with a recess recessed in the circumferential direction to reduce the thickness of the column part.Type: GrantFiled: November 5, 2014Date of Patent: August 15, 2017Assignee: NTN CORPORATIONInventors: Tatsuya Omoto, Shoichi Hioki, Mitsuo Sasabe, Eiichi Nakamizo, Tomoya Sakaguchi
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Roller bearing, retainer segment of roller bearing for supporting main shaft of wind-power generator
Patent number: 9664231Abstract: A tapered roller bearing (31a) has a plurality of retainer segments (11a, 11d) each having a pocket to house a tapered roller (34a), and arranged so as to be continuously lined with each other in a circumferential direction between an outer ring (32a) and an inner ring (33a). The retainer segment (11a, 11d) is formed of a resin containing a filler material to lower a thermal linear expansion coefficient. In addition, a clearance (39a) is provided between the first retainer segment (11a) and the last retainer segment (11d) after the plurality of retainer segments (11a, 11d) have been arranged in the circumferential direction without providing any clearance. Here a circumferential range (R) of the clearance (39a) is larger than 0.075% of a circumference of a circle passing through a center of the retainer segment (11a, 11d) and smaller than 0.12% thereof at room temperature.Type: GrantFiled: April 22, 2015Date of Patent: May 30, 2017Assignee: NTN CORPORATIONInventors: Tatsuya Omoto, Eiichi Nakamizo, Tomoya Sakaguchi -
ROLLER BEARING, RETAINER SEGMENT OF ROLLER BEARING FOR SUPPORTING MAIN SHAFT OF WIND-POWER GENERATOR
Publication number: 20150226262Abstract: A tapered roller bearing (31a) has a plurality of retainer segments (11a, 11d) each having a pocket to house a tapered roller (34a), and arranged so as to be continuously lined with each other in a circumferential direction between an outer ring (32a) and an inner ring (33a). The retainer segment (11a, 11d) is formed of a resin containing a filler material to lower a thermal linear expansion coefficient. In addition, a clearance (39a) is provided between the first retainer segment (11a) and the last retainer segment (11d) after the plurality of retainer segments (11a, 11d) have been arranged in the circumferential direction without providing any clearance. Here a circumferential range (R) of the clearance (39a) is larger than 0.075% of a circumference of a circle passing through a center of the retainer segment (11a, 11d) and smaller than 0.12% thereof at room temperature.Type: ApplicationFiled: April 22, 2015Publication date: August 13, 2015Inventors: Tatsuya OMOTO, Eiichi Nakamizo, Tomoya Sakaguchi -
Publication number: 20150056079Abstract: A roller bearing comprises an outer ring, an inner ring, a plurality of rollers arranged between the outer ring and the inner ring, and a plurality of retainer segments having a plurality of column parts extending in a direction along a shaft so as to form a pocket for holding the roller, and connection parts and extending in a circumferential direction to connect the plurality of column parts, and continuously lined with each other in the circumferential direction between the outer ring and the inner ring. The column part is positioned at an circumferential end of the retainer segment. Here, a circumferential outer side end face of the column part positioned at the end is flat, and a circumferential inner side end face of the column part positioned at said end is provided with a recess recessed in the circumferential direction to reduce the thickness of the column part.Type: ApplicationFiled: November 5, 2014Publication date: February 26, 2015Inventors: Tatsuya OMOTO, Shoichi HIOKI, Mitsuo SASABE, Eiichi NAKAMIZO, Tomoya SAKAGUCHI
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Patent number: 8905646Abstract: A roller bearing comprises an outer ring, an inner ring, a plurality of rollers arranged between the outer ring and the inner ring, and a plurality of retainer segments having a plurality of column parts extending in a direction along a shaft so as to form a pocket for holding the roller, and connection parts and extending in a circumferential direction to connect the plurality of column parts, and continuously lined with each other in the circumferential direction between the outer ring and the inner ring. The column part is positioned at an circumferential end of the retainer segment. Here, a circumferential outer side end face of the column part positioned at the end is flat, and a circumferential inner side end face of the column part positioned at said end is provided with a recess recessed in the circumferential direction to reduce the thickness of the column part.Type: GrantFiled: November 21, 2012Date of Patent: December 9, 2014Assignee: NTN CorporationInventors: Tatsuya Omoto, Shoichi Hioki, Mitsuo Sasabe, Eiichi Nakamizo, Tomoya Sakaguchi
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Publication number: 20140248018Abstract: A tapered roller bearing (31a) has a plurality of retainer segments (11a, 11d) each having a pocket to house a tapered roller (34a), and arranged so as to be continuously lined with each other in a circumferential direction between an outer ring (32a) and an inner ring (33a). The retainer segment (11a, 11d) is formed of a resin containing a filler material to lower a thermal linear expansion coefficient. In addition, a clearance (39a) is provided between the first retainer segment (11a) and the last retainer segment (11d) after the plurality of retainer segments (11a, 11d) have been arranged in the circumferential direction without providing any clearance. Here a circumferential range (R) of the clearance (39a) is larger than 0.075% of a circumference of a circle passing through a center of the retainer segment (11a, 11d) and smaller than 0.12% thereof at room temperature.Type: ApplicationFiled: May 16, 2014Publication date: September 4, 2014Applicant: NTN CORPORATIONInventors: Tatsuya Omoto, Eiichi Nakamizo, Tomoya Sakaguchi
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Patent number: 8764304Abstract: A tapered roller bearing (31a) has a plurality of retainer segments (11a, 11d) each having a pocket to house a tapered roller (34a), and arranged so as to be continuously lined with each other in a circumferential direction between an outer ring (32a) and an inner ring (33a). The retainer segment (11a, 11d) is formed of a resin containing a filler material to lower a thermal linear expansion coefficient. In addition, a clearance (39a) is provided between the first retainer segment (11a) and the last retainer segment (11d) after the plurality of retainer segments (11a, 11d) have been arranged in the circumferential direction without providing any clearance. Here a circumferential range (R) of the clearance (39a) is larger than 0.075% of a circumference of a circle passing through a center of the retainer segment (11a, 11d) and smaller than 0.12% thereof at room temperature.Type: GrantFiled: September 4, 2007Date of Patent: July 1, 2014Assignee: NTN CorporationInventors: Tatsuya Omoto, Eiichi Nakamizo, Tomoya Sakaguchi
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Publication number: 20130078098Abstract: A roller bearing comprises an outer ring, an inner ring, a plurality of rollers arranged between the outer ring and the inner ring, and a plurality of retainer segments having a plurality of column parts extending in a direction along a shaft so as to form a pocket for holding the roller, and connection parts and extending in a circumferential direction to connect the plurality of column parts, and continuously lined with each other in the circumferential direction between the outer ring and the inner ring. The column part is positioned at an circumferential end of the retainer segment. Here, a circumferential outer side end face of the column part positioned at the end is flat, and a circumferential inner side end face of the column part positioned at said end is provided with a recess recessed in the circumferential direction to reduce the thickness of the column part.Type: ApplicationFiled: November 21, 2012Publication date: March 28, 2013Inventors: Tatsuya OMOTO, Shoichi HIOKI, Mitsuo SASABE, Eiichi NAKAMIZO, Tomoya SAKAGUCHI
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Patent number: 8382380Abstract: Tapered rollers are retained between outer and inner rings by a retainer to be circumferentially spaced apart from each other. The inner ring has a raceway on its outer surface and includes small and large-diameter flanges at the small- and large-diameter ends of the raceway, respectively. The retainer includes two annular portions and crossbars extending between the annular portions. Its radially inner surface is located radially inwardly of the pitch cone of the tapered rollers to increase the thickness of the crossbars and the axial thickness of the small-diameter annular portion. The conical surface defined by the outer surfaces of the crossbars has an inclination angle that is greater than the central angle of the bearing to increase the volume of the crossbars. The rigidity of the retainer is thus increased.Type: GrantFiled: August 23, 2006Date of Patent: February 26, 2013Assignee: NTN CorporationInventors: Eiichi Nakamizo, Junichi Hattori, Hideshi Nishiwaki, Tatsuya Omoto, Michio Hori
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Publication number: 20110249931Abstract: A tapered roller bearing (31) has pockets to house tapered rollers (34) and includes a plurality of retainer segments (11a) to (11d) arranged so as to be continuously lined with each other in a circumferential direction between an outer ring (32) and an inner ring (33). The retainer segments (11a) to (11d) include at least a first retainer segment having a first circumferential length, and a second retainer segment having a second circumferential length different from the first circumferential length. After the retainer segments (11a) to (11d) have been arranged in the circumferential direction without space therebetween, a circumferential clearance (39) is provided between the retainer segment (11a) arranged first and the retainer segment (11d) arranged last. A circumferential range of the clearance is larger than 0.08% and smaller than 0.10% of a circumference of a circle passing through a center of the retainer segment at room temperature.Type: ApplicationFiled: September 1, 2009Publication date: October 13, 2011Applicant: NTN CORPORATIONInventors: Tatsuya Omoto, Eiichi Nakamizo
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Publication number: 20100316321Abstract: The object is to provide a miniature-sized tapered roller bearing that includes an inner race having an inner diameter of not more than 9 mm and that ensures high dynamic load rating. The ratio of the average diameter DRAVE of the tapered rollers 3 to the inner diameter DIi of the inner race 1, i.e. DRAVE/DIi is set to 0.45 to 0.70 to ensure high dynamic load rating with a miniature-sized tapered roller bearing of which the inner race 1 has an inner diameter of not less than 9 mm.Type: ApplicationFiled: November 30, 2007Publication date: December 16, 2010Inventors: Eiichi Nakamizo, Hideshi Nishiwaki, Tsukasa Toyoda
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Publication number: 20090324410Abstract: A tapered roller bearing (31a) has a plurality of retainer segments (11a, 11d) each having a pocket to house a tapered roller (34a), and arranged so as to be continuously lined with each other in a circumferential direction between an outer ring (32a) and an inner ring (33a). The retainer segment (11a, 11d) is formed of a resin containing a filler material to lower a thermal linear expansion coefficient. In addition, a clearance (39a) is provided between the first retainer segment (11a) and the last retainer segment (11d) after the plurality of retainer segments (11a, 11d) have been arranged in the circumferential direction without providing any clearance. Here a circumferential range (R) of the clearance (39a) is larger than 0.075% of a circumference of a circle passing through a center of the retainer segment (11a, 11d) and smaller than 0.12% thereof at room temperature.Type: ApplicationFiled: September 4, 2007Publication date: December 31, 2009Inventors: Tatsuya Omoto, Eiichi Nakamizo, Tomoya Sakaguchi
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Publication number: 20090046974Abstract: A roller bearing comprises an outer ring, an inner ring, a plurality of rollers arranged between the outer ring and the inner ring, and a plurality of retainer segments (11a) having a plurality of column parts (14a) and (14b) extending in a direction along a shaft so as to form a pocket (13a) for holding the roller, and connection parts (15a) and (15b) extending in a circumferential direction so as to connect the plurality of column parts (14a) and (14b), and continuously lined with each other in the circumferential direction between the outer ring and the inner ring. The column part (14a) is positioned at an circumferential end of the retainer segment (11a). Here, a circumferential outer side end face (21a) of the column part (14a) positioned at the end is flat, and a circumferential inner side end face (25a) of the column part (14a) positioned at said end is provided with a recess (23a) recessed in the circumferential direction so as to reduce the thickness of the column part (14a).Type: ApplicationFiled: February 26, 2007Publication date: February 19, 2009Inventors: Tatsuya Omoto, Shoichi Hioki, Mitsuo Sasabe, Eiichi Nakamizo, Tomoya Sakaguchi
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Publication number: 20080193067Abstract: A tapered roller bearing is proposed for supporting each of planetary rotary members that rotate about a common axis and their own axes. The tapered roller bearing includes an inner ring spacer provided adjacent to the small-diameter flange of the inner ring. The retainer retaining the tapered rollers in position includes small- and large-diameter annular portions and bridges connecting the two annular portions together. The retainer further includes a disk portion extending radially inwardly from the axially outer end of the small-diameter annular portion, and a third annular portion extending axially outwardly from the radially inner end of the disk portion. The third annular portion has a radially inner guided surface guided by the radially outer guiding surface of the inner ring spacer. A hardened surface layer and a lubricating film are formed on the radially outer guiding surface of the inner ring spacer.Type: ApplicationFiled: January 28, 2008Publication date: August 14, 2008Inventors: Junichi Hattori, Michio Hori, Eiichi Nakamizo, Tsukasa Toyoda
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Publication number: 20070047865Abstract: A plurality of tapered rollers are retained between an outer ring and an inner ring by a retainer so as to be circumferentially spaced apart from each other. The inner ring is formed with a raceway on its outer surface and includes a small-diameter flange and a large-diameter flange at the small- and large-diameter ends of the raceway, respectively. The retainer includes two annular portions and crossbars extending between the annular portions. Its radially inner surface is located radially inwardly of the pitch cone of the tapered rollers (conical surface defined by the axes of the tapered rollers) to increase the thickness of the crossbars as well as the axial thickness of the small-diameter annular portion. The rigidity of the retainer thus increases.Type: ApplicationFiled: August 23, 2006Publication date: March 1, 2007Inventors: Eiichi Nakamizo, Junichi Hattori, Hideshi Nishiwaki, Tatsuya Omoto, Michio Hori