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公开(公告)号：AT95349T
公开(公告)日：1993-10-15
申请号：AT90113790
申请日：1990-07-18
Applicant: EBARA CORP
Inventor： KONNO DAISUKE , MIWA SACHIHIKO , AIYOSHIZAWA SHUNICHI , KASHIHARA KAZUYUKI , SATO YOSHIO , HIROKAWA KAZUTO
Abstract: A spindle motor which is designed to rotate with minimal vibrations and hence is suitable of a hard disk driver. The spindle motor employs hydrodynamic bearings as radial and thrust bearings. A support shaft is formed in a cylindrical configuration with a center hole, and a rotor has a columnar portion which is inserted into the center hole in the support shaft. A thrust bearing collar is attached to the lower end of the rotor, and a thrust bearing member is secured to a base in opposing relation to the thrust bearing collar. A group of stator coils and a radial bearing member are disposed on either the inner peripheral surface of the center hole in the support shaft or the outer peripheral surface of the support shaft, and a group of rotor magnets and a radial bearing sleeve are disposed on either the outer peripheral surface of the columnar portion or the inner peripheral surface of the rotor in opposing relation to the stator coil group and the radial bearing member.
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公开(公告)号：DE69003619T2
公开(公告)日：1994-04-28
申请号：DE69003619
申请日：1990-07-18
Applicant: EBARA CORP
Inventor： KONNO DAISUKE , MIWA SACHIHIKO , AIYOSHIZAWA SHUNICHI , KASHIHARA KAZUYUKI , SATO YOSHIO , HIROKAWA KAZUTO
Abstract: A spindle motor which is designed to rotate with minimal vibrations and hence is suitable of a hard disk driver. The spindle motor employs hydrodynamic bearings as radial and thrust bearings. A support shaft is formed in a cylindrical configuration with a center hole, and a rotor has a columnar portion which is inserted into the center hole in the support shaft. A thrust bearing collar is attached to the lower end of the rotor, and a thrust bearing member is secured to a base in opposing relation to the thrust bearing collar. A group of stator coils and a radial bearing member are disposed on either the inner peripheral surface of the center hole in the support shaft or the outer peripheral surface of the support shaft, and a group of rotor magnets and a radial bearing sleeve are disposed on either the outer peripheral surface of the columnar portion or the inner peripheral surface of the rotor in opposing relation to the stator coil group and the radial bearing member.
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公开(公告)号：DE69117267T2
公开(公告)日：1996-10-02
申请号：DE69117267
申请日：1991-11-29
Applicant: EBARA CORP
Inventor： NODA YUMIKO , KAMIYA ICHIRO , TOSHIMITSU MANABU , SATO YOSHIO , SHINJO RYOICHI
Abstract: A ceramic hydrodynamic bearing used as a radial or a thrust bearing in a spindle motor for a hard disk driver. The bearing includes a ceramic bearing base having hydrodynamic pressure generating grooves. A sliding surface of the bearing base is irradiated with an energy beam with a high energy density to remove said material, thereby forming hydrodynamic pressure generating groove, and at the same time the grooves are coated with a modification layer that is formed by melting the ceramic material that constitutes said ceramic bearing base with the energy beam and by solidifying said ceramic bearing base.
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公开(公告)号：DE69117267D1
公开(公告)日：1996-03-28
申请号：DE69117267
申请日：1991-11-29
Applicant: EBARA CORP
Inventor： NODA YUMIKO , KAMIYA ICHIRO , TOSHIMITSU MANABU , SATO YOSHIO , SHINJO RYOICHI
Abstract: A ceramic hydrodynamic bearing used as a radial or a thrust bearing in a spindle motor for a hard disk driver. The bearing includes a ceramic bearing base having hydrodynamic pressure generating grooves. A sliding surface of the bearing base is irradiated with an energy beam with a high energy density to remove said material, thereby forming hydrodynamic pressure generating groove, and at the same time the grooves are coated with a modification layer that is formed by melting the ceramic material that constitutes said ceramic bearing base with the energy beam and by solidifying said ceramic bearing base.
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公开(公告)号：DE69017248T2
公开(公告)日：1995-10-26
申请号：DE69017248
申请日：1990-04-11
Applicant: EBARA CORP
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Patent Agency Ranking
公开(公告)号：ES2071696T3
公开(公告)日：1995-07-01
申请号：ES90106941
申请日：1990-04-11
Applicant: EBARA CORP
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公开(公告)号：DE69003619D1
公开(公告)日：1993-11-04
申请号：DE69003619
申请日：1990-07-18
Applicant: EBARA CORP
Inventor： KONNO DAISUKE , MIWA SACHIHIKO , AIYOSHIZAWA SHUNICHI , KASHIHARA KAZUYUKI , SATO YOSHIO , HIROKAWA KAZUTO
Abstract: A spindle motor which is designed to rotate with minimal vibrations and hence is suitable of a hard disk driver. The spindle motor employs hydrodynamic bearings as radial and thrust bearings. A support shaft is formed in a cylindrical configuration with a center hole, and a rotor has a columnar portion which is inserted into the center hole in the support shaft. A thrust bearing collar is attached to the lower end of the rotor, and a thrust bearing member is secured to a base in opposing relation to the thrust bearing collar. A group of stator coils and a radial bearing member are disposed on either the inner peripheral surface of the center hole in the support shaft or the outer peripheral surface of the support shaft, and a group of rotor magnets and a radial bearing sleeve are disposed on either the outer peripheral surface of the columnar portion or the inner peripheral surface of the rotor in opposing relation to the stator coil group and the radial bearing member.
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公开(公告)号：DE69017248D1
公开(公告)日：1995-04-06
申请号：DE69017248
申请日：1990-04-11
Applicant: EBARA CORP
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公开(公告)号：AT119306T
公开(公告)日：1995-03-15
申请号：AT90106941
申请日：1990-04-11
Applicant: EBARA CORP
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公开(公告)号：JPH08128551A
公开(公告)日：1996-05-21
申请号：JP26948594
申请日：1994-11-02
Applicant: EBARA CORP , EBARA KANKYO TECHNO HOKKAIDO K
Inventor： KIKUTA KYOSUKE , TAKITA SHIGEO , SATO YOSHIO
Abstract: PURPOSE: To provide an inexpensive air valve provided with a simple structure by which generation of an impact pressure accompanying recollision of a water column is prevented. CONSTITUTION: A piston 6 stored in a casing 1 is energized by means of a spring 7 so as to close an intake passage 4 with a large diameter in an intake cover 5, and a float 10 is arranged in the inside of the piston 6 so as to be guided to an air discharge hole 8 with a small diameter on the top of the piston 6 by means of a float case 11.
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