Patents by Inventor Seizo Miyazaki
Seizo Miyazaki 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: 7031106Abstract: The sealing members (14a, 14b) comprise a film member produced by forming an aluminum or alumina deposition film on at least one side surface of a film-like core material. One side surface outer circumferential rim part of the sealing members is bonded and fixed on the outer end surface of outer rings (9, 9) constituting the rolling bearings (4, 4).Type: GrantFiled: February 1, 2001Date of Patent: April 18, 2006Assignee: NSK Ltd.Inventor: Seizo Miyazaki
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Publication number: 20040213493Abstract: An assembly method of a preload-adjustable rolling bearing unit comprising the steps of providing a shaft having a first inner raceway, an inner ring being press fitted onto the shaft and having a second inner raceway, such that a pitch of both raceways is set greater than a pitch required to give a predetermined preload, providing an outer ring having outer raceways, providing a plurality of balls to be fitted between the outer raceways of the outer ring, and the first and second inner raceways, positioning the balls equidistant apart in the circumferential direction, and vibrating the rolling bearing unit by means of piezo electric elements while moving the inner ring in the axial direction, measuring the resonant frequency of the rolling bearing unit with a vibration sensor to control the preload whereby the inner ring is pressed onto a shaft while vibrating with only a small amount of energy without scratching the raceway and rolling surfaces.Type: ApplicationFiled: January 15, 2004Publication date: October 28, 2004Applicant: NSK LTD.Inventors: Toru Takamizawa, Daijiro Kitahara, Seizo Miyazaki
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Publication number: 20040161183Abstract: A bearing device comprising a shaft, a housing, a double row of bearings provided between the shaft and the housing and preloaded by a fixed-position preloading method, the double row of bearings having a pair of races with a gap therebetween for preload adjustment, and the bearing device further having a support member for supporting one side of the races in the pre-loading direction, and the support member provided on the side of one of the shaft and the housing.Type: ApplicationFiled: February 19, 2004Publication date: August 19, 2004Applicant: NSK Ltd.Inventors: Seizo Miyazaki, Hideo Ouchi, Toru Takamizawa
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Patent number: 6715923Abstract: A bearing device comprising a shaft, a housing, a double row of bearings provided between the shaft and the housing and preloaded by a fixed-position preloading method, the double row of bearings having a pair of races with a gap therebetween for preload adjustment, and the bearing device further having a support member for supporting one side of the races in the pre-loading direction, and the support member provided on the side of one of the shaft and the housing.Type: GrantFiled: January 5, 2001Date of Patent: April 6, 2004Assignee: NSK Ltd.Inventors: Seizo Miyazaki, Hideo Ouchi, Toru Takamizawa
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Patent number: 6712518Abstract: An assembly method of a preload-adjustable rolling bearing unit comprising the steps of providing a shaft having a first inner raceway, an inner ring being press fitted onto the shaft and having a second inner raceway, such that a pitch of both raceways is set greater than a pitch required to give a predetermined preload, providing an outer ring having outer raceways, providing a plurality of balls to be fitted between the outer raceways of the outer ring, and the first and second inner raceways, positioning the balls equidistant apart in the circumferential direction, and vibrating the rolling bearing unit by means of piezo electric elements while moving the inner ring in the axial direction, measuring the resonant frequency of the rolling bearing unit with a vibration sensor to control the preload whereby the inner ring is pressed onto a shaft while vibrating with only a small amount of energy without scratching the raceway and rolling surfaces.Type: GrantFiled: February 22, 2002Date of Patent: March 30, 2004Assignee: NSK Ltd.Inventors: Toru Takamizawa, Daijiro Kitahara, Seizo Miyazaki
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Publication number: 20020159663Abstract: The sealing members 14a, 14b comprise a film member produced by forming an aluminum or alumina deposition film on at least one side surface of a film-like core material. One side surface outer circumferential rim part of the sealing members is bonded and fixed on the outer end surface of outer rings 9, 9 constituting the rolling bearings 4, 4.Type: ApplicationFiled: February 1, 2001Publication date: October 31, 2002Inventor: Seizo Miyazaki
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Patent number: 6446339Abstract: An assembly method of a preload-adjustable rolling bearing unit comprising the steps of providing a shaft having a first inner raceway, an inner ring being press fitted onto the shaft and having a second inner raceway, such that a pitch of both raceways is set greater than a pitch required to give a predetermined preload, providing an outer ring having outer raceways, providing a plurality of balls to be fitted between the outer raceways of the outer ring, and the first and second inner raceways, positioning the balls equidistant apart in the circumferential direction, and vibrating the rolling bearing unit by means of piezo electric elements while moving the inner ring in the axial direction, measuring the resonant frequency of the rolling bearing unit with a vibration sensor to control the preload whereby the inner ring is pressed onto a shaft while vibrating with only a small amount of energy without scratching the raceway and rolling surfaces.Type: GrantFiled: April 27, 2001Date of Patent: September 10, 2002Assignee: NSK Ltd.Inventors: Toru Takamizawa, Daijiro Kitahara, Seizo Miyazaki
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Publication number: 20020118901Abstract: An assembly method of a preload-adjustable rolling bearing unit comprising the steps of providing a shaft having a first inner raceway, an inner ring being press fitted onto the shaft and having a second inner raceway, such that a pitch of both raceways is set greater than a pitch required to give a predetermined preload, providing an outer ring having outer raceways, providing a plurality of balls to be fitted between the outer raceways of the outer ring, and the first and second inner raceways, positioning the balls equidistant apart in the circumferential direction, and vibrating the rolling bearing unit by means of piezo electric elements while moving the inner ring in the axial direction, measuring the resonant frequency of the rolling bearing unit with a vibration sensor to control the preload whereby the inner ring is pressed onto a shaft while vibrating with only a small amount of energy without scratching the raceway and rolling surfaces.Type: ApplicationFiled: February 22, 2002Publication date: August 29, 2002Applicant: NSK LTD.Inventors: Toru Takamizawa, Daijiro Kitahara, Seizo Miyazaki
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Patent number: 6394657Abstract: An assembly method of a preload-adjustable rolling bearing unit comprising the steps of providing a shaft having a first inner raceway, an inner ring being press fitted onto the shaft and having a second innor raceway, such that a pitch of both raceways is set greater than a pitch required to give a predetermined preload, providing an outer ring having outer raceways, providing a plurality of balls to be fitted between the outer raceways of the outer ring, and the first and second ir raceways, positioning the balls equidistant apart in the circumferential direction, and vibrating the rolling bearing unit by means of piezo electric elements while moving the inner ring In the axial direction, measuring the resonant frequency of the rolling bearing unit with a vibration sensor to control the preload whereby the inner ring is pressed onto a shaft while vibrating with only a small amount of energy without scratching the raceway and rolling surfaces.Type: GrantFiled: March 25, 1996Date of Patent: May 28, 2002Assignee: NSK Ltd.Inventors: Toru Takamizawa, Daijiro Kitahara, Seizo Miyazaki
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Publication number: 20010038727Abstract: A bearing device comprising a shaft, a housing, a double row of bearings provided between the shaft and the housing and preloaded by a fixed-position preloading method, the double row of bearings having a pair of races with a gap therebetween for preload adjustment, and the bearing device further having a support member for supporting one side of the races in the pre-loading direction, and the support member provided on the side of one of the shaft and the housing.Type: ApplicationFiled: January 5, 2001Publication date: November 8, 2001Inventors: Seizo Miyazaki, Hideo Ouchi, Toru Takamizawa
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Publication number: 20010028753Abstract: An assembly method of a preload-adjustable rolling bearing unit comprising the steps of providing a shaft having a first inner raceway, an inner ring being press fitted onto the shaft and having a second inner raceway, such that a pitch of both raceways is set greater than a pitch required to give a predetermined preload, providing an outer ring having outer raceways, providing a plurality of balls to be fitted between the outer raceways of the outer ring, and the first and second inner raceways, positioning the balls equidistant apart in the circumferential direction, and vibrating the rolling bearing unit by means of piezo electric elements while moving the inner ring in the axial direction, measuring the resonant frequency of the rolling bearing unit with a vibration sensor to control the preload whereby the inner ring is pressed onto a shaft while vibrating with only a small amount of energy without scratching the raceway and rolling surfaces.Type: ApplicationFiled: April 27, 2001Publication date: October 11, 2001Applicant: NSK Ltd.Inventors: Toru Takamizawa, Daijiro Kitahara, Seizo Miyazaki
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Patent number: 6202306Abstract: The preload of the double row rolling bearing unit after completion is kept at a proper value regardless of the elastic deformation of the shaft caused when pushing the inner race in the axial direction wherein the balls are first installed in the bearing at the first pitch P1 of the ball rows which is larger than the pitch p1 in the state where the preload is proper and then preloaded to a pitch slightly smaller than the second pitch p1, so that the ball rows have the second pitch p1 after the shaft is elastically restored.Type: GrantFiled: May 13, 1999Date of Patent: March 20, 2001Assignee: NSK Ltd.Inventor: Seizo Miyazaki
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Patent number: 6000855Abstract: An outer ring spacer for use in a double row rolling bearing unit fitted onto a shaft and comprising inner rings externally secured to the shaft having a pair of spaced apart inner ring raceways, a pair of outer rings having an inner peripheral face formed with outer ring raceways facing respective inner ring raceways, and a plurality of rolling elements provided between the inner ring raceways and outer ring raceways, the outer ring spacer fitted between the outer rings, and comprising a cylindrical spacer body formed with axially opposite parallel end faces abutted against the mutually facing end faces of the outer rings, and a displacement prevention ring internally secured to one axial end of the spacer body, and having a portion protruding from one of the parallel end faces of the spacer body so as to be engaged with the inner peripheral surface of one end portion of the outer rings to prevent the spacer body from being displaced radially.Type: GrantFiled: January 27, 1998Date of Patent: December 14, 1999Assignee: NSK Ltd.Inventor: Seizo Miyazaki
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Patent number: 5996230Abstract: The double-row ball bearing having a stationary shaft, a rotatable outer ring and balls between them is set in an inspection apparatus, so that the acoustic sound produced as the outer ring is rotated with the shaft inserted inside the balls is detected by a vibration pickup device to examine for the flaws on the surfaces of balls, shaft and outer ring.Type: GrantFiled: December 17, 1996Date of Patent: December 7, 1999Assignee: NSK Ltd.Inventors: Seizo Miyazaki, Daijiro Kitahara, Shiro Saito
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Patent number: 5863136Abstract: The center of rotation of a shaft 2 with inner rings 11a externally secured thereto, is made concentric with the geometric center to thereby prevent the occurrence of runout during high speed rotation. To achieve this, the axial runout of the end portion of the shaft 2 is detected by a displacement sensor 23 while the shaft 2 is rotating. Then based on the measurement results, a portion of the shaft 2 is heated by a laser projector 24 to produce a structural change in this portion, thereby slightly bending the shaft 2. The center of rotation of the shaft 2 is thus made to coincide with the geometric center as a result of the bending.Type: GrantFiled: September 4, 1997Date of Patent: January 26, 1999Assignee: NSK Ltd.Inventor: Seizo Miyazaki
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Patent number: 5785432Abstract: An outer ring spacer for use in a double row rolling bearing unit fitted onto a shaft and comprising inner rings externally secured to the shaft having a pair of spaced apart inner ring raceways, a pair of outer rings having an inner peripheral face formed with outer ring raceways facing respective inner ring raceways, and a plurality of rolling elements provided between the inner ring raceways and outer ring raceways, the outer ring spacer fitted between the outer rings, and comprising a cylindrical spacer body formed with axially opposite parallel end faces abutted against the mutually facing end faces of the outer rings, and a displacement prevention ring internally secured to one axial end of the spacer body, and having a portion protruding from one of the parallel end faces of the spacer body so as to be engaged with the inner peripheral surface of one end portion of the outer rings to prevent the spacer body from being displaced radially.Type: GrantFiled: February 26, 1997Date of Patent: July 28, 1998Assignee: NSK Ltd.Inventor: Seizo Miyazaki
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Patent number: 5599111Abstract: The double-row ball bearing having a stationary shaft, a rotatable outer ring and balls between them is set in an inspection apparatus, so that the acoustic sound produced as the outer ring is rotated with the shaft inserted inside the balls is detected by a vibration pickup device to examine for the flaws on the surfaces of balls, shaft and outer ring.Type: GrantFiled: December 19, 1994Date of Patent: February 4, 1997Assignee: NSK, Ltd.Inventors: Seizo Miyazaki, Daijiro Kitahara, Shiro Saito
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Patent number: 5547291Abstract: A preloaded rolling bearing unit of the double row type has a pair of inner rings which have a raceway formed on a peripheral face at a location displaced in the axial direction from a central portion thereof, a first cylindrical portion axially protruding by a relatively large amount from one side of the raceway, and a second cylindrical portion axially protruding by a relatively small amount from the other side of the fourth raceway, whereby when the inner ring is engaged with an outer ring, the first cylindrical portion is positioned on an axially inner side of the bearing unit and the second cylindrical portion is positioned on an axially outer side of the bearing unit.Type: GrantFiled: September 28, 1994Date of Patent: August 20, 1996Assignee: NSK, Ltd.Inventors: Seizo Miyazaki, Shiro Saito, Daijiro Kitahara
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Patent number: 5509198Abstract: An assembly method of a preload-adjustable rolling bearing unit comprising the steps of providing a shaft having a first inner raceway, an inner ring being press fitted onto the shaft and having a second inner raceway, such that a pitch of both raceways is set greater then a pitch required to give a predetermined preload, providing an outer ring having outer raceways, providing a plurality of balls to be fitted between the outer raceways of the outer ring, and the first and second inner raceways, positioning the balls equidistant apart in the circumferential direction, and vibrating the rolling bearing unit by means of piezo electric elements while moving the inner ring in the axial direction, measuring the resonant frequency of the rolling bearing unit with a vibration sensor to control the preload whereby the inner ring is pressed onto a shaft while vibrating with only a small amount of energy without scratching the raceway and rolling surfaces.Type: GrantFiled: June 6, 1994Date of Patent: April 23, 1996Assignee: NSK Ltd.Inventors: Toru Takamizawa, Daijiro Kitahara, Seizo Miyazaki
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Patent number: 5341569Abstract: A preload-adjustable bearing is constructed of a first rotary unit and second rotary unit. The first rotary unit has a first race and second race arranged immobile in a direction approaching toward each other. The second rotary unit has a third race and fourth race. The third race is located opposite the first race while the fourth race is located opposite the second race. The third race is fixed relative to the second rotary unit in a direction away from the fourth race. The fourth race is fitted with the second rotary unit with an interference formed therebetween movably relative to the second rotary unit. The fourth race is movable toward the third race under axial pressure applied between the fourth race and the second rotary unit.Type: GrantFiled: February 22, 1993Date of Patent: August 30, 1994Assignee: NSK Ltd.Inventors: Toru Takamizawa, Seizo Miyazaki