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11. 发明申请

US20090154852A1 HYDRODYNAMIC BEARING DEVICE, SPINDLE MOTOR, AND INFORMATION RECORDING AND REPRODUCING APPARATUS 审中-公开
标题翻译：水力发电轴承装置，主轴电机，信息记录和再生装置
公开(公告)号：US20090154852A1
公开(公告)日：2009-06-18
申请号：US12333903
申请日：2008-12-12
申请人： Takafumi ASADA , Hiroaki Saito , Daisuke Ito
发明人： Takafumi ASADA , Hiroaki Saito , Daisuke Ito
IPC分类号： F16C32/06
CPC分类号： G11B19/2036 , F16C17/045 , F16C33/103 , F16C33/107 , F16C2370/12
摘要： The hydrodynamic bearing device comprises a sleeve 1, a shaft 2, a thrust bearing portion, and a lubricating fluid 5. The sleeve 1 has a bearing hole 1C. The shaft 2 is inserted into the bearing hole 1C in a state of being able to rotate relative to the sleeve 1. The thrust bearing portion has a hydrodynamic groove for generating pressure in the axial direction. The lubricating fluid 5 is held in a gap formed by the thrust bearing portion. The hydrodynamic bearing device is further constituted so that the value of a wear amount function F6 falls into a specific range. With the hydrodynamic bearing device, the required bearing performance can be satisfied, and the thrust bearing portion has a longer intermittent service life.
摘要翻译：流体动力轴承装置包括套筒1，轴2，推力轴承部分和润滑流体5.套筒1具有轴承孔1C。轴2在能够相对于套筒1旋转的状态下插入到轴承孔1C中。推力轴承部分具有用于在轴向方向产生压力的流体动力槽。润滑流体5保持在由止推轴承部形成的间隙中。流体动力轴承装置进一步构成为使磨损量函数F6的值落入特定范围。使用流体动力轴承装置，可以满足所需的轴承性能，推力轴承部分具有较长的间歇使用寿命。

12. 发明申请

US20080080797A1 Hydrodynamic bearing type rotary device and recording and reproducing apparatus equipped with same 有权
标题翻译：流体动力轴承式旋转装置和配备有该装置的记录和再现装置
公开(公告)号：US20080080797A1
公开(公告)日：2008-04-03
申请号：US11905354
申请日：2007-09-28
申请人： Takafumi Asada , Hiroaki Saito , Daisuke Ito
发明人： Takafumi Asada , Hiroaki Saito , Daisuke Ito
IPC分类号： F16C32/06 , G11B5/52
CPC分类号： F16C17/107 , F16C33/107 , F16C33/1085 , F16C33/745 , F16C2370/12 , G11B19/2036
摘要： PROBLEM: To prevent oil film breakage in bearings without expelling of air internally accumulated at the bearing. METHOD FOR SOLVING THE PROBLEM: A hydrodynamic bearing type rotary device in which radial hydrodynamic grooves and thrust hydrodynamic grooves form communicating channels; have communicating holes designed to communicate the groove end of the radial hydrodynamic groove on the side opposite the thrust hydrodynamic grooves with the groove end of the thrust hydrodynamic groove on the side opposite the radial hydrodynamic grooves; have a circulation route composed by the communicating hole, the radial hydrodynamic groove, and the thrust hydrodynamic groove; and circulate lubricating oil by means of a pump force of the hydrodynamic groove. It is possible to attain a long-lasting hydrodynamic bearing-type rotary device in which lubricating oil is circulated by pressure applied by a hydrodynamic groove positioned upstream to a bearing portion, ceasing the formation of low-pressure parts from the bearing portion, preventing the accumulation of air bubbles, and thereby preventing the occurrence of oil film breakage at the radial hydrodynamic groove and the thrust hydrodynamic groove.
摘要翻译：问题：为防止轴承内部积聚的空气排出轴承油膜破损。解决问题的方法：一种流体动力轴承型旋转装置，其中径向流体动力槽和推力流体动力槽形成连通通道; 具有连通孔，其设计成在径向流体动力槽的与推力流体动力槽相对的一侧的沟槽端部与推力流体动力槽的与径向流体动力槽相对的一侧的槽端部连通; 具有由连通孔，径向流体动力槽和推力流体动力槽组成的循环路线; 并通过流体动力槽的泵力使润滑油循环。可以获得一种持久的流体动力轴承式旋转装置，其中润滑油通过由位于轴承部分上游的流体动力槽施加的压力循环，停止从轴承部分形成低压部件，从而防止积聚气泡，从而防止在径向流体动力槽和推力流体动力槽处发生油膜破裂。

13. 发明申请

US20070253650A1 Hydrodynamic bearing type rotary device and recording and reproduction apparatus including the same 有权
标题翻译：流体动力轴承型旋转装置及包括其的记录和再现装置
公开(公告)号：US20070253650A1
公开(公告)日：2007-11-01
申请号：US11785186
申请日：2007-04-16
申请人： Takafumi Asada , Hiroaki Saito , Daisuke Ito
发明人： Takafumi Asada , Hiroaki Saito , Daisuke Ito
IPC分类号： F16C32/06
CPC分类号： F16C33/107 , F16C17/107 , F16C2370/12
摘要： To prevent air from being trapped inside a bearing and causing the bearing to have oil film rupture and NRRO to deteriorate. In a hydrodynamic bearing, a first lubricant reservoir is provided in a gap between a lower surface of a hub and a sleeve, and a second lubricant reservoir is provided in a gap between an outer peripheral surface of the sleeve and an inner peripheral surface of the hub or an inner peripheral surface of a stopper member fixed to the hub. If air enters inside such a hydrodynamic bearing, the air has to be discharged. For this purpose, the relationship in widths of the radial bearing gap, the maximum gap of the first lubricant reservoir under the lower surface of the hub and the maximum gap of the second lubricant reservoir on the sleeve outer peripheral surface, or the relationship in magnitudes of capillary forces thereof is adjusted. The principle that air tends to move toward the portion having smaller capillary pressure is utilized to make it difficult for the air to be trapped inside the bearing and to smoothly discharge the air from a gas-liquid interface of the second lubricant reservoir.
摘要翻译：为了防止空气被夹在轴承内部并导致轴承有油膜破裂和NRRO劣化。在流体动力轴承中，第一润滑剂储存器设置在毂的下表面和套筒之间的间隙中，并且第二润滑剂储存器设置在套筒的外周表面和套筒的外周表面之间的间隙中轮毂或固定到轮毂的止动件的内周面。如果空气进入这种流体动力轴承内，则空气必须排出。为此，径向轴承间隙的宽度关系，轮毂下表面下的第一润滑剂储存器的最大间隙和套筒外周表面上的第二润滑剂储存器的最大间隙，或者其关系的毛细管力被调节。利用空气倾向于朝向具有较小毛细管压力的部分移动的原理，使得难以将空气捕获在轴承内部并且平滑地从第二润滑剂储存器的气 - 液界面排出空气。

14. 发明申请

US20070047859A1 Hydrodynamic bearing type rotary device and recording and reproduction apparatus including the same 审中-公开
标题翻译：流体动力轴承型旋转装置及包括其的记录和再现装置
公开(公告)号：US20070047859A1
公开(公告)日：2007-03-01
申请号：US11491970
申请日：2006-07-25
申请人： Takafumi Asada , Hiroaki Saito , Daisuke Ito
发明人： Takafumi Asada , Hiroaki Saito , Daisuke Ito
IPC分类号： F16C32/06
CPC分类号： F16C17/107 , F16C33/107 , F16C2370/12
摘要： A hydrodynamic bearing type rotary device which can maintain an appropriate life by considering the relationship of the life of the bearing with radial load, eccentricity, an oil shearing work function, a rotation rate and the like is provided. A hydrodynamic bearing type rotary device 15 has an shaft being inserted into a bearing hole 1C of a sleeve 1 so as to be relatively rotatable, a hub rotor 7 being attached to one of the sleeve 1 or the shaft 2, which rotates, and a radial bearing surface having hydrodynamic grooves 3A and 3B formed on at least one of an outer peripheral surface of the shaft 2 and an inner peripheral surface of the sleeve 1. Given that an oil shearing work function represented by following Expression (1) is W, the hydrodynamic bearing type rotary device is formed such that a value of 1/W is 10000 or higher: W=P×L×Ep (1) Fs=(η×ω×Dˆ2×Lˆ2)/Cˆ3 (2) Ep=P/(Fs×C) (3)
摘要翻译：提供了通过考虑轴承的寿命与径向载荷，偏心率，油剪切功函数，旋转速度等关系来保持适当寿命的流体动力轴承型旋转装置。流体动力轴承型旋转装置15具有轴，以相对旋转的方式插入到套筒1的轴承孔1C中，轮毂转子7附接到套筒1或旋转的轴2中，并且形成在轴2的外周面和套筒1的内周面中的至少一个上的流体动力槽3A和3B的径向支承面。考虑到由以下表达式（1）表示的油剪切功函数，是W，流体动力轴承型旋转装置形成为使得1 / W的值为10000或更高：<？in-line-formula description =“In-line formula”end =“lead”？> W = PxLxEp（ 1）<？in-line-formula description =“In-line Formulas”end =“tail”？> <？in-line-formula description =“In-line Formulas”end =“lead”？> Fs =（etaxomegaxD2xL2 ）/ C3（2）<？in-line-formula description =“In-line Formulas”end =“tail”？> <？in-line-formula description =“In-line Formulas”end =“lead”？> Ep = P /（FsxC）（3）<βin-line-formula descr iption =“在线公式”end =“tail”？>

15. 发明申请

US20090028474A1 HYDRODYNAMIC BEARING DEVICE, AND SPINDLE MOTOR EQUIPPED WITH SAME 有权
标题翻译：水力轴承装置，以及配有相同的主轴电机
公开(公告)号：US20090028474A1
公开(公告)日：2009-01-29
申请号：US12179067
申请日：2008-07-24
申请人： Takafumi ASADA , Hiroaki Saito , Daisuke Ito , Shigeo Obata
发明人： Takafumi ASADA , Hiroaki Saito , Daisuke Ito , Shigeo Obata
IPC分类号： F16C32/06
CPC分类号： G11B17/0284 , F16C17/107 , F16C33/107 , F16C33/74 , F16C2370/12
摘要： There is provided a hydrodynamic bearing device with which the lubricant is prevented from leaking to the outside, and good seal performance can be maintained, and a spindle motor equipped with this hydrodynamic bearing device. The hydrodynamic bearing device comprises a shaft, a sleeve, a lubricant that fills a microscopic gap, a radial bearing portion, a thrust beating portion, and a bearing seal portion. The value of a function P1/V1, where V1 is a fluctuation volume of the sleeve in the axial direction and P1 is a capillary pressure index at a vapor-liquid interface located near the opened end of the bearing seal portion, is at least a specific value.
摘要翻译：提供了一种防止润滑剂泄漏到外部的流体动力轴承装置，并且可以保持良好的密封性能，以及配备有该流体动力轴承装置的主轴电机。流体动力轴承装置包括轴，套筒，填充微小间隙的润滑剂，径向轴承部分，推力打浆部分和轴承密封部分。功能P1 / V1的值，其中V1是套筒在轴向上的波动体积，P1是位于轴承密封部的开口端附近的气液界面处的毛细管压力指数，至少为具体价值。

16. 发明申请

US20080304775A1 HYDRODYNAMIC BEARING DEVICE, AND RECORDING AND REPRODUCING APPARATUS EQUIPPED WITH SAME 审中-公开
标题翻译：水动力轴承装置，以及装备的记录和再生装置
公开(公告)号：US20080304775A1
公开(公告)日：2008-12-11
申请号：US12120030
申请日：2008-05-13
申请人： Takafumi Asada , Hiroaki Saito , Daisuke Ito
发明人： Takafumi Asada , Hiroaki Saito , Daisuke Ito
IPC分类号： F16C32/06
CPC分类号： F16C17/107 , F16C33/107 , F16C33/745 , F16C2370/12
摘要： There is provided a hydrodynamic bearing device that maintains high bearing angular stiffness, and that prevents oil film separation in the bearing by smoothly discharging any bubbles present inside the bearing. With a hydrodynamic bearing device, a communicating hole and a radial hydrodynamic groove constitute a circulation path for a lubricant, and a first thrust bearing surface is provided at a location in contact with the circulation path. A first hydrodynamic groove formed in the first thrust bearing surface is a spiral groove with a pump-in pattern. Any bubbles in the bearing are smoothly discharged by the circulation of the lubricant produced by the asymmetrical radial hydrodynamic groove. The pressure generated at the thrust bearing surface during rotation of the bearing has a distribution such that there is a wide range of high pressure.
摘要翻译：提供了一种保持高轴承角刚度的流体动力轴承装置，并且通过平滑地排出轴承内存在的任何气泡来防止轴承中的油膜分离。使用流体动力轴承装置，连通孔和径向流体动力槽构成润滑剂的循环路径，并且在与循环路径接触的位置处设置第一止推轴承表面。形成在第一止推轴承表面中的第一流体动力槽是具有泵入图案的螺旋槽。通过由不对称的径向流体动力槽产生的润滑剂的循环，轴承中的任何气泡都能顺利排出。在轴承旋转期间在推力轴承表面产生的压力具有分布，使得存在宽范围的高压。

17. 发明授权

US08033732B2 Hydrodynamic bearing device, and spindle motor equipped with same 有权
标题翻译：流体动力轴承装置，主轴电机配备相同
公开(公告)号：US08033732B2
公开(公告)日：2011-10-11
申请号：US12179067
申请日：2008-07-24
申请人： Takafumi Asada , Hiroaki Saito , Daisuke Ito , Shigeo Obata
发明人： Takafumi Asada , Hiroaki Saito , Daisuke Ito , Shigeo Obata
IPC分类号： F16C32/06
CPC分类号： G11B17/0284 , F16C17/107 , F16C33/107 , F16C33/74 , F16C2370/12
摘要： In a hydrodynamic bearing device with which the lubricant is prevented from leaking to the outside, and good seal performance can be maintained, and in a spindle motor equipped with this hydrodynamic bearing device, the hydrodynamic bearing device includes a shaft, a sleeve, a lubricant that fills a microscopic gap, a radial bearing portion, a thrust bearing portion, and a bearing seal portion. The value of a function P1/V1, where V1 is a fluctuation volume of the sleeve in the axial direction and P1 is a capillary pressure index at a vapor-liquid interface located near the opened end of the bearing seal portion, is at least a specific value.
摘要翻译：在防止润滑剂泄漏到外部的流体动力轴承装置中，并且可以保持良好的密封性能，并且在配备有该流体动力轴承装置的主轴电机中，流体动力轴承装置包括轴，套筒，润滑剂其填充微观间隙，径向轴承部分，止推轴承部分和轴承密封部分。功能P1 / V1的值，其中V1是套筒在轴向上的波动体积，P1是位于轴承密封部的开口端附近的气液界面处的毛细管压力指数，至少为具体价值。

18. 发明授权

US07950854B2 Hydrodynamic bearing type rotary device and recording and reproducing apparatus equipped with same 有权
标题翻译：流体动力轴承式旋转装置和配备有该装置的记录和再现装置
公开(公告)号：US07950854B2
公开(公告)日：2011-05-31
申请号：US11905354
申请日：2007-09-28
申请人： Takafumi Asada , Hiroaki Saito , Daisuke Ito
发明人： Takafumi Asada , Hiroaki Saito , Daisuke Ito
IPC分类号： F16C32/06
CPC分类号： F16C17/107 , F16C33/107 , F16C33/1085 , F16C33/745 , F16C2370/12 , G11B19/2036
摘要： A hydrodynamic bearing type rotary device includes radial hydrodynamic grooves and thrust hydrodynamic grooves forming communicating channels, communicating holes designed to communicate the groove end of the radial hydrodynamic groove on the side opposite the thrust hydrodynamic grooves with the groove end of the thrust hydrodynamic groove on the side opposite the radial hydrodynamic grooves, and a circulation route composed by the communicating hole, the radial hydrodynamic groove, and the thrust hydrodynamic groove. Lubricating oil is circulated by means of a pump force of the hydrodynamic groove. The hydrodynamic bearing device prevents the formation of low-pressure parts from the bearing portion, preventing the accumulation of air bubbles, and thereby preventing the occurrence of oil film breakage at the radial hydrodynamic groove and the thrust hydrodynamic groove.
摘要翻译：流体动力轴承型旋转装置包括形成连通通道的径向流体动力槽和推力流体动力槽，连通孔设计成将径向流体动力槽的凹槽端与推力流体动力槽相反的一侧与推力流体动力槽的槽端连通与径向流体动力槽相对的一侧，以及由连通孔，径向流体动力槽和推力流体动力槽构成的循环路径。润滑油通过流体动力槽的泵力循环。流体动力轴承装置防止从轴承部分形成低压部件，防止气泡的积聚，从而防止在径向流体动力槽和推力流体动力槽处发生油膜破裂。

19. 发明授权

US07527432B2 Hydrodynamic bearing type rotary device and recording and reproduction apparatus including the same 有权
标题翻译：流体动力轴承型旋转装置及包括其的记录和再现装置
公开(公告)号：US07527432B2
公开(公告)日：2009-05-05
申请号：US11492166
申请日：2006-07-25
申请人： Takafumi Asada , Hiroaki Saito , Daisuke Ito
发明人： Takafumi Asada , Hiroaki Saito , Daisuke Ito
IPC分类号： F16C32/06
CPC分类号： F16C33/103 , F16C17/107 , F16C33/1085 , F16C33/745 , F16C2370/12
摘要： A hydrodynamic bearing type rotary device which allows bubbles in a lubricating fluid to be surely discharged from a bearing portion is provided. A hydrodynamic bearing mechanism 40 of the hydrodynamic bearing type rotary device is formed of a sleeve 1, a shaft 2, a flange 3, a thrust plate 4, a seal cap 5, and oil 6. A first fluid reservoir F is formed between the sleeve 1, the flange 3, and the thrust plate 4. A second fluid reservoir H is formed between the sleeve 1 and the seal cap 5. In the sleeve 1, a communication hole G extending along an axial direction is formed. The first fluid reservoir F and the second fluid reservoir H communicate with each other through the communication hole G. The oil 6 is filled between the members. A capillary pressure is higher in the first fluid reservoir F than in the second fluid reservoir H.
摘要翻译：提供了允许润滑流体中的气泡从轴承部确定地排出的流体动力轴承型旋转装置。流体动力轴承型旋转装置的流体动力轴承机构40由套筒1，轴2，凸缘3，止推板4，密封盖5和油6形成。第一流体储存器F形成在套筒1，凸缘3和止推板4.第二流体储存器H形成在套筒1和密封盖5之间。在套筒1中形成有沿轴向延伸的连通孔G. 第一流体储存器F和第二流体储存器H通过连通孔G彼此连通。油6填充在构件之间。第一流体储存器F中的毛细管压力高于第二流体储存器H中的毛细管压力。

20. 发明申请

US20080212907A1 HYDRODYNAMIC BEARING, AND HYDRODYNAMIC BEARING-TYPE ROTARY DEVICE AND RECORDING AND REPRODUCING APPARATUS EQUIPPED WITH SAME 审中-公开
标题翻译：水动力轴承和水动力轴承类型旋转装置及其配备的记录和再生装置
公开(公告)号：US20080212907A1
公开(公告)日：2008-09-04
申请号：US12031199
申请日：2008-02-14
申请人： Takafumi Asada , Hiroaki Saito , Daisuke Ito
发明人： Takafumi Asada , Hiroaki Saito , Daisuke Ito
IPC分类号： F16C32/06
CPC分类号： F16C33/102 , F16C17/107 , F16C33/107 , F16C2370/12
摘要： The angular stiffness of a bearing is kept high, and at the same time air inside the bearing is discharged smoothly, without accumulating, which prevents oil film separation on the bearing. With the present invention, a communicating hole is provided, the hole and a radial hydrodynamic groove constitute a circulation path for a lubricant, there is a first thrust bearing face in contact with the circulation path, there is a first hydrodynamic groove on the face, this groove is a herringbone groove with a pump-in pattern, and no low-pressure part is generated in the thrust bearing, so even if the bearing undergoes a pressure change, there is no risk that the air accumulated in a low-pressure part will expand and cause oil film separation on the bearing face. Also, the bubbles are smoothly discharged by circulation of the lubricant in the asymmetrical radial hydrodynamic groove, and there is a pressure distribution such that the pressure generated at the face during bearing rotation is sufficiently high at the outer peripheral portion of the groove pattern, and angular stiffness is high.
摘要翻译：轴承的角刚度保持较高，同时轴承内的空气平稳排出，不会积聚，防止轴承上的油膜分离。在本发明中，设置有连通孔，孔和径向流体动力槽构成润滑剂的循环路径，存在与循环路径接触的第一止推轴承面，面上存在第一流体动力槽，该凹槽是具有泵入图案的人字形槽，并且在推力轴承中不产生低压部分，因此即使轴承经受压力变化，也不存在积聚在低压部分中的空气的风险会膨胀并导致轴承面上的油膜分离。此外，气泡通过不对称径向流体动力槽中的润滑剂的循环而平滑地排出，并且存在压力分布，使得在轴承旋转期间在面处产生的压力在凹槽图案的外周部分足够高，并且角刚度高。

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