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1. 发明专利

JPH06187721A MAGNETIC DISK DRIVING DEVICE 失效
公开(公告)号：JPH06187721A
公开(公告)日：1994-07-08
申请号：JP27097492
申请日：1992-09-14
申请人： NIHON DENSAN NAGANO KK
发明人： YAZAKI ASAO , FUKUDA TETSUJI
IPC分类号： G11B17/038 , G11B19/20
摘要： PURPOSE:To easily fix plural magnetic recording disks to a rotor which are stacked in layer in the state that radial directions are substantially oriented in the same direction. CONSTITUTION:Plural supporting recessed parts 38 capable of supporting the inner peripheries of the hard disks 36 in the pressure-holding state are provided at constant distances on supporting members 34. Three supporting member 34 are arranged at 120-degree center angles, and the inner peripheries of the respective hard disks 36 are engaged and supported in the corresponding supporting recessed parts 38. The engaging part 20b of a rotter hub 20 is pushed in the insides of the supporting members 34 and the lower end surfaces of all supporting members 34 are abutted on an abutting surface 20c. The respective supporting members 34 are fitted and fixed to the engaging part 20b in a state that the members 34 are positioned in the radial direction and the axial direction by engaging pressure.

2. 发明专利

JPH06245428A SPINDLE MOTOR 失效
公开(公告)号：JPH06245428A
公开(公告)日：1994-09-02
申请号：JP5776893
申请日：1993-02-22
申请人： NIHON DENSAN NAGANO KK
发明人： YAZAKI ASAO
IPC分类号： H02K5/10 , H02K5/173
摘要： PURPOSE:To center a sealing member to a stationary shaft and to accurately and efficiently set a radial gap between the inner periphery of the member and the outer periphery of the shaft. CONSTITUTION:A concentricity between the inner periphery of an inner ring 26b and the outer periphery of an outer ring 26a of an upper ball bearing 26 is accurately formed so as to be sufficiently reduced. A concentricity between the drooped part 38b of a sealing member 38 and the inner periphery of a horizontal part 38a is also accurately formed so as to be similarly sufficiently reduced. The inner periphery of a drooped part 38b of the member 38 is externally engaged fixedly with the outer periphery of the outer ring 26a. The inner periphery of a horizontal part 38a of the member 38 is opposed through a small radial gap to the outer periphery of a shaft 16.

3. 发明专利

JPH04308438A BEARING STRUCTURE AND SPINDLE MOTOR 失效
公开(公告)号：JPH04308438A
公开(公告)日：1992-10-30
申请号：JP10053891
申请日：1991-04-04
申请人： NIHON DENSAN NAGANO KK
发明人： YAZAKI ASAO
IPC分类号： F16C33/58 , H02K7/08
摘要： PURPOSE:To prevent fluctuation of the rotary shaft center of the title motor, and to simplify (reduce in thickness) while maintaining the rigidity and durability necessary to suppress the vibration and noise in a bearing structure and a spindle motor. CONSTITUTION:Contact angles of spheres 2, 3 with an outer periphery of an inner race 11 and/or contact angles of the spheres with an inner periphery of an outer race 12 is crossed obliquely to an axial direction, and a support member 38 for pressing and supporting the spheres is provided.

4. 发明专利

JPH0638436A SPINDLE MOTOR 失效
公开(公告)号：JPH0638436A
公开(公告)日：1994-02-10
申请号：JP20755592
申请日：1992-07-10
申请人： NIHON DENSAN NAGANO KK
发明人： YAZAKI ASAO
IPC分类号： F16J15/43 , F16J15/40 , H02K5/15 , H02K5/173
摘要： PURPOSE:To make a fixed section or a rotary section easily retain a sealing unit while the sealing property between them is assured, and to eliminate the possibility of sealing failures caused by improper adhesive application, pin holes and an uncured adhesive. CONSTITUTION:A first annular groove 50 is formed along the inner circumferential surface of a sealing section 26d. A resilient annular body 52 is fitted into the first annular groove 50 over the entire circumference thereof while it is vertically compressed, so that the annular body is held by the groove. An inner projecting portion 52a of the resilient annular body 52 is fitted into a second annular groove 62 of a sealing unit 54. While the inner projecting portion 52a is vertically pressed over the entire circumference thereof, the sealing unit 52 is retained by a sealing section 26d.

5. 发明专利

JPH05316681A SPINDLE MOTOR 失效
公开(公告)号：JPH05316681A
公开(公告)日：1993-11-26
申请号：JP14333692
申请日：1992-05-09
申请人： NIHON DENSAN NAGANO KK
发明人： YAZAKI ASAO
IPC分类号： F16C19/14 , F16C35/067 , H02K5/173 , H02K21/22
摘要： PURPOSE:To provide a spindle motor which can prevent the extraction of a preload from each bearing caused by a difference in coefficient of linear expansion. CONSTITUTION:In the spindle motor in which the inner and outer races 13a and 14a and 13b and 14b of two bearings 13 and 14 are respectively stuck to the outer peripheral surface of a shaft and internal surfaces 16 and 17 of a hub 7 and holding member 12, thermal distortion absorbing elastic members 19a and 19b are respectively interposed between the end faces of the outer races 13b and 14b of the bearings 13 and 14 and stepped surfaces 18 and 20 of the hub 7 and member 12.

6. 发明专利

JPH04265647A SPINDLE MOTOR 失效
公开(公告)号：JPH04265647A
公开(公告)日：1992-09-21
申请号：JP4449891
申请日：1991-02-16
申请人： NIHON DENSAN NAGANO KK
发明人： YAZAKI ASAO
IPC分类号： H02K5/15 , H02K5/173 , H02K21/22
摘要： PURPOSE:To pressurize specified pressure to the rotary shaft of a hub and maintain stable pressure by plastically deforming one part of a bracket, and applying inward force to the bearing member. CONSTITUTION:Screws 7 are screwed in the two places of the circular projections 71 provided all around the inside periphery of the bracket 2 of a spindle motor. Guide grooves with specified depths are bored in advance in the circular projections 71 in which the screws 7 are screwed, and as the screws 7 are screwed in to the specified depth, the margins of the guide grooves widen, and they cause plastic deformation. If one sets the direction of resultant, which works in the direction of the shaft center of the shaft member 11 by the plastic deformation of the screwing of the screw 7, in the direction of having no harm in the direction of the fall of a record disk, the accuracy in the rotation of a spindle motor such as whirling, etc. can be maintained high.

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