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1. 发明专利

JP2000076779A Magnetic disk device 审中-公开
标题翻译：磁盘设备
公开(公告)号：JP2000076779A
公开(公告)日：2000-03-14
申请号：JP24929398
申请日：1998-09-03
申请人： Hitachi Ltd , 株式会社日立製作所
发明人： ARAI KATSUTOSHI , MURANISHI MASARU , TOMITA KENJI , UEFUNE KOUKI , SAEGUSA SHOZO , YANASE YUICHI
IPC分类号： F16C17/10 , F16C33/10 , G11B5/02 , G11B19/20 , G11B25/04 , G11B33/14 , H02K5/16
CPC分类号： F16C33/107 , F16C17/045 , F16C33/1035 , F16C2370/12 , G11B19/2009 , G11B25/043 , G11B33/1446 , G11B33/148 , G11B33/1486 , H02K5/1675 , Y10T29/49025
摘要： PROBLEM TO BE SOLVED: To suppress liquid force in the axial direction onto a hub and fluctuation in the liquid force and to enhance rotary precision in the axial direction by providing an air circulating path penetrating through the axial direction on the hub loading a magnetic disk. SOLUTION: For coping with the axial direction weight acting on the hub 11, magnetic attracting force is provided between a permanent magnet 10 and an armature core 8, and for reducing the fluctuational weight due to air disturbance, a hole 12 is provided on the hub 11, and pressure between a motor 25 side and a casing cover 20 side is balanced. In such a manner, the air circulating path hole 12 penetrating from the motor 25 side to the casing cover 25 side is provided, and an air flow is generated in the arrow direction. At this time, by using a filter made of fluorine resin, or the filter coated with the fluorine resin on a fiber to the hole 12 part, the oil particles come out to a magnetic disk side along the air flow, and the magnetic disk is prevented from contamination.
摘要翻译：要解决的问题：通过在装载磁盘的轮毂上设置贯穿轴向的空气循环路径，将轴向上的液力抑制在轮毂上，并且提高液力的波动，提高轴向的旋转精度。解决方案：为了应对作用在轮毂11上的轴向方向重量，在永磁体10和电枢芯8之间提供磁吸引力，为了减少由于空气扰动引起的波动重量，在轮毂如图11所示，马达25侧和壳体盖20侧之间的压力是平衡的。以这种方式，设置从马达25侧穿过壳体盖25侧的空气循环路径孔12，并且沿箭头方向产生空气流。此时，通过使用由氟树脂制成的过滤器或将氟树脂涂覆在纤维上的过滤器到孔12部分，油颗粒沿空气流出到磁盘侧，磁盘为防止污染。

2. 发明专利

JP2002369446A Disk drive 审中-公开
标题翻译：磁盘驱动器
公开(公告)号：JP2002369446A
公开(公告)日：2002-12-20
申请号：JP2002077461
申请日：2002-03-20
申请人： Hitachi Ltd , 株式会社日立製作所
发明人： ARAI KATSUTOSHI , KAWAKAMI KAZUHIKO , KANAMARU NAONOBU , KUMASAKA TAKAYUKI , KONO TAKASHI , YANASE YUICHI , MURANISHI MASARU
IPC分类号： F16C17/02 , F16C33/10 , G11B19/20 , H02K5/16 , H02K7/08 , H02K7/09
摘要： PROBLEM TO BE SOLVED: To provide a bearing unit, having higher rigidity of bearing and ensuring low loss, higher impact resistance and moreover superior in mass productivity, and to provide a high reliability disk drive.
SOLUTION: A plurality of radial bearings which include dynamic-pressure multiple arc bearing are engaged with a non-magnetic bearing housing, a rotary shaft is supported at higher accuracy with the dynamic-pressure multiple arc bearing via lubrication fluid between the rotary shaft and the radial bearings and the bearing surface having arc diameter, concentric with the bearing center is provided within the bearing unit. Thereby, the impact load to be applied to the disk drive from external side is received with a part which is in surface- contact with the rotary shaft.
COPYRIGHT: (C)2003,JPO
摘要翻译：要解决的问题：提供一种轴承单元，具有更高的轴承刚性并且确保低损耗，更高的抗冲击性以及更高的批量生产率，并提供高可靠性的磁盘驱动器。解决方案：包括动压多弧轴承的多个径向轴承与非磁性轴承座接合，旋转轴通过旋转轴和旋转轴之间的润滑流体与动态多弧轴承以更高的精度被支撑径向轴承和具有与轴承中心同心的圆弧直径的轴承表面设置在轴承单元内。由此，从外侧施加到盘驱动器的冲击载荷被接收到与旋转轴表面接触的部分。

3. 发明专利

JP2002327764A BEARING WATERPROOF STRUCTURE AND DISC CLEANING DEVICE 失效
公开(公告)号：JP2002327764A
公开(公告)日：2002-11-15
申请号：JP2001133994
申请日：2001-05-01
申请人： HITACHI ELECTR ENG , HITACHI LTD
发明人： ISHIDA TAKAHISA , AMANO HIDEAKI , OTAKE MITSUYOSHI , MIYAJIMA SHUNEI , YOSHIMURA YASUHIRO , ARAI KATSUTOSHI
IPC分类号： B08B1/04 , B08B3/02 , B08B7/04 , F16C33/80 , G11B5/84
摘要： PROBLEM TO BE SOLVED: To provide a bearing waterproof structure capable of getting a long service life of bearings exposed in at least water or its splash or in the atmosphere including these substances. SOLUTION: In the waterproof structure of a bearing supporting rotatably a shaft, a water repellent film is formed on the surface of a member forming a labyrinth gap set between the bearing exposed in the atmosphere which is in at least water or its splash or includes these substances and the shaft.

4. 发明专利

JP2001034929A MAGNETIC DISC AND MAGNETIC DISC DRIVE 失效
公开(公告)号：JP2001034929A
公开(公告)日：2001-02-09
申请号：JP21006199
申请日：1999-07-26
申请人： HITACHI LTD
发明人： JO KINKOKU , TOKISUE HIROMITSU , TOKUYAMA MIKIO , ARAI KATSUTOSHI
IPC分类号： G11B5/72 , G11B5/82 , G11B19/04
摘要： PROBLEM TO BE SOLVED: To obtain a magnetic disc drive having a magnetic head slider being loaded/unloaded in which a magnetic disc is protected against damage at the time of loading/unloading. SOLUTION: The magnetic disc is protected against damage at the time of loading/unloading by providing, in a load/unload zone 8, with a protective film 11 thicker than the thickness 12 of the protective film 10 in a data zone 9. On the other hand, micro protrusions rougher than the data zone 9 are provided in the load/unload zone 8 in order to suppress vibration due to sliding of a slider at the time of load/unload thus protecting the magnetic disc against damage. Furthermore, bearing grooves are made in the load/unload zone in order to increase the fly height of the slider in the load/unload zone and to prevent the slider from touching the magnetic disc thus protecting the magnetic disc against damage.

5. 发明专利

JPH1189162A STATIC PRESSURE TYPE THRUST BEARING DEVICE AND ROTARY MACHINE WITH IT 失效
公开(公告)号：JPH1189162A
公开(公告)日：1999-03-30
申请号：JP24368297
申请日：1997-09-09
申请人： HITACHI LTD
发明人： ARAI KATSUTOSHI , HENMI MAKOTO , INOUE TOMOAKI
IPC分类号： F16C17/04 , H02K5/167
摘要： PROBLEM TO BE SOLVED: To operate a rotary machine with fluid lubrication from starting to a rated rotation due to the operation of static and dynamic pressures by performing arrangement so that the static pressure due to the pressure oil of a pocket part operates on an innerperiphery side from nearly the center of the inner/outer diameter of a thrust pad. SOLUTION: A stoker-shaped flange part is provided at a rotary shaft 1, and a plurality of slide pads 2 are arranged at the lower part. The slide pad 2 is constituted so that it is pivot-supported by a height adjustment bolt 4 and a high-pressure lubrication oil can be lubricated to an approximately 0.1 mm deep pocket 7 being provided at the slide part of the thrust pads 2 from a lubrication hole 8 via a flexible hose 9 from a pressure oil ring 10. Also, a sufficient lubrication oil 11 for dipping the thrust pad 2 is lubricated to an oil bath 3 in advance. A plurality of slide pads 2 are adjusted so that they are on the same surface by the height adjustment bolt 4 being incorporated into a pivot guide 6.

6. 发明专利

JPH10196657A OIL RETAINING BEARING UNIT AND MOTOR PROVIDED WITH IT 失效
公开(公告)号：JPH10196657A
公开(公告)日：1998-07-31
申请号：JP2473497
申请日：1997-02-07
申请人： HITACHI LTD , HITACHI POWDERED METALS
发明人： ARAI KATSUTOSHI , KONO TAKASHI , SATO YOSHIHIRO , TERAJIMA SEIICHIRO , KONDO MAKOTO , TOKUSHIMA HIDEKAZU
IPC分类号： F16C33/10 , H02K5/16
摘要： PROBLEM TO BE SOLVED: To maintain fluid lubrication so as to attain required a high speed characteristic and rotational precision and to accomplish improvement in productivity and reduction in a cost at the same time by using a high density sintered oil retaining bearing provided with a specific effective porosity and density. SOLUTION: A slinger 8 is arranged on an opened end side of a bearing housing 7, an oil retaining bearing 2a is arranged at an interval from the slinger 8, an oil retaining member 3 and an oil retaining bearing 2b are arranged so as to be brought into tight contact with the oil retaining bearing 2a, and a thrust bearing 5 and a lid 6 are arranged at certain intervals from the oil retaining member 3 and the oil retaining bearing 2b, while lubrication oil 4a is injected to the position (e) in which a part of the oil retaining member 3 is impregnated. For preventing deterioration of an oil film pressure due to rotation of a shaft, a high density sintered oil retaining bearing, in which an effective porosity is less than 18vol.% while density is 6.8 or more, is used for each of the bearings 2a, 2b. As the bearings 5, 2b are always impregnated with the lubrication oil 4a, no shortage of oil is caused. According to a capillary phenomenon, the lubrication oil 4a is fed from the porous member 3, which is provided with a pore diameter larger than those for the bearings 2a, 2b, to the bearing 2a. In this way, compliance with high speed rotation is accomplished, and rotational precision can be improved, and reduction in a cost and improvement in productivity can be accomplished at the same time.

7. 发明专利

JPH099560A LASER BEAM SCANNER MOTOR 失效
公开(公告)号：JPH099560A
公开(公告)日：1997-01-10
申请号：JP12984996
申请日：1996-05-24
申请人： HITACHI LTD
发明人： ARAI KATSUTOSHI , KAWAIKE KAZUHIKO , HIROYAMA HIROO , FURUKAWA YOSHIO
IPC分类号： F16C17/10 , F16C33/74 , H02K5/167 , H02K7/08 , H04N1/113
摘要： PROBLEM TO BE SOLVED: To obtain a laser beam scanner motor including a bearing having long service life and excellent in high speed and high accuracy rotation performance. SOLUTION: A rotor 20 for mounting a polygon mirror is fitted over a rotary shaft 21 supported by a magnetic fluid bearing 22 comprising a radial sliding bearing 26 and a thrust sliding bearing 27 disposed coaxially at the opposite end parts in the protruding bearing supporting part 23b of a housing 23. Stator side motor part 25 and rotor side motor part 24 are disposed on the outside of the outer circumference of bearing supporting part 23b. The housing 23 is made of a nonmagnetic material while the rotary shaft 21 is made of a magnetically permeable material and the radial sliding bearing 26 is composed of a permanent magnet ring 29 also serving as a magnetic fluid sealing means. The thrust sliding bearing 27 has the function of radial sliding bearing and made of a sintered alloy to be impregnated with the magnetic fluid.

8. 发明专利

JPH05202892A VERTICAL SHAFT STORAGE PUMP 失效
公开(公告)号：JPH05202892A
公开(公告)日：1993-08-10
申请号：JP1368892
申请日：1992-01-29
申请人： HITACHI LTD
发明人： AIZAWA KOJI , ARAI KATSUTOSHI , OKADA RYOJI , YAMADA MASAYUKI , TAKADA KUNIO
IPC分类号： C10M103/00 , C10M173/00 , C10N40/02 , F04B53/00 , F04D13/00 , F04D29/046 , F04D29/06 , F16C17/14 , F16C33/24
摘要： PURPOSE:To carry out stable repetitive running for a lone period by accommodating a bearing at the pumping passage of a pump, placing a rotary lubricating oil tank which is provided with an opening part communicating with the pumping passage, and using its fluid to be pumped as lubricating fluid without feeding lubricating fluid from the outside of the pump. CONSTITUTION:In this pump, a rotating shaft 3 where a blade is fixed is overhung and supported by a ceramic bearing device. Besides, the bearing device is provided with a ceramic bearing 6 which slidably-supports a sleeve 5 fixed at, the rotating shaft 3 and a bearing easing 9 elastically-jointed with a bearing case 7 where the ceramic bearing 6 is installed by an elastic member 8. With this constitution, a fluid reservoir layer 10 is disposed at the outer peripheral side of the rotating shaft 3 so as to surround the lower edge surface and the outer peripheral side of the bearing casing 9. Moreover, lubricating fluid is fed in the fluid reservoir layer 10 which is assembled before its installation. Then the lifting pump is driven by its lifting fluid in itself. It is thus possible to slide the ceramic bearing 6, being submerged in lubricating fluid constant.

9. 发明专利

JPH04325854A POLYGON MIRROR MOTOR 失效
公开(公告)号：JPH04325854A
公开(公告)日：1992-11-16
申请号：JP9672091
申请日：1991-04-26
申请人： HITACHI LTD
发明人： UNO TAKESHI , AKASHI SUEO , ARAI KATSUTOSHI
IPC分类号： F16C32/04 , F16J15/40 , F16J15/43 , H02K5/167 , H02K5/24 , H02K7/09 , H02K21/14
摘要： PURPOSE:To suppress contact vibration between a shaft and a radial bearing and vibration by while so as to realize suppression of vibration by properly setting a relation between a clearance, provided between the shaft of a bearing unit and the radial bearing, and a lubricating groove of the radial bearing. CONSTITUTION:A clearance C between a shaft 1 and a radial bearing 11 is set a little smaller to provided an oil groove of area about 1 to 5 times the sectional area in a sliding part of a radial bearing part in the radial bearing 11 on the flange side with good circularity of the radial bearing. The radial bearing on the boss side is formed into a structure having no oil groove in order to prevent whirl due to excessive lubrication because weak tightening force of an end bracket 10 combined with deformation at the time of mounting a dynamic pressure seal 12 causes low circularity thus making it hard to cut the oil film. As a result, the radial bearing of low vibration from a low temperature region to a high temperature region can be formed.

10. 发明专利

JPH01320314A BEARING DEVICE 失效
公开(公告)号：JPH01320314A
公开(公告)日：1989-12-26
申请号：JP15233388
申请日：1988-06-22
申请人： HITACHI LTD
发明人： ARAI KATSUTOSHI , KAWAIKE KAZUHIKO , HIROYAMA HIROO , UNO TAKESHI
IPC分类号： F16C17/10 , F16C32/04 , F16C33/10 , F16C33/74 , F16C33/82 , F16J15/43
摘要： PURPOSE:To prevent magnetic fluid from deteriorating in performance, to elongate life, to improve reliability and to reduce cost by arranging a magnetic fluid seal and bearing members with spaces among them, and making bearings have a lubricating fluid circulation mechanism utilizing rotation of a shaft. CONSTITUTION:A magnetic fluid seal 2 constituted with a permanent magnet 3, a magnetic pole piece 4, a cover 5 and magnetic fluid 12 in coaxial with a bearing housing 14, and a first and a second radial bearing 6, 7, a thrust bearing 8 are arranged. Further, the magnetic fluid seal 2 is arranged on keeping a space (c) to the first radial bearing 6, and passages a-d for lubricating fluid 11 are formed with the bearing housing 14, the first and the second radial bearing 6, 7 and a rotary shaft 1. Therefore, the magnetic fluid does not overflow or disperse on account of thermal expansion, lubricating fluid is circulated by rotation of the rotary shaft 1, deterioration in performance is prevented, and elongation in life, improvement on reliability and reduction in cost can be achieved.

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