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。

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。

公开(公告)号：US07589934B2

公开(公告)日：2009-09-15

申请号：US12188545

申请日：2008-08-08

申请人： Takafumi Asada ,  Hiroaki Saito ,  Takao Yoshitsugu ,  Keigo Kusaka ,  Hiroyuki Kiriyama ,  Daisuke Ito

发明人： Takafumi Asada ,  Hiroaki Saito ,  Takao Yoshitsugu ,  Keigo Kusaka ,  Hiroyuki Kiriyama ,  Daisuke Ito

IPC分类号： G11B19/20

CPC分类号： F16C17/107 ,  F16C33/103 ,  F16C33/107 ,  F16C2370/12

摘要： In a hydrodynamic bearing device in which a radial bearing face having a dynamic pressure generating groove on a shaft or an inner periphery of a sleeve is provided and a clearance between the shaft and the sleeve is filled with lubricant, an annular depression is provided on one end face of the sleeve adjacent to a rotor hub and a cover plate for covering the depression is attached to the sleeve so as to define a reservoir for the lubricant or air for the purpose of preventing such a risk that absence of an oil film occurs in clearances of a bearing of the hydrodynamic bearing device due to outflow of oil upon forcing of the oil by air received into the bearing. A step portion is provided on the other end face of the sleeve such that the step portion and the reservoir are communicated with each other by a communication hole. During operation of the hydrodynamic bearing device, air in the hydrodynamic bearing device reaches the reservoir via the communication hole so as to be discharged from the reservoir.

摘要翻译： 在一种流体动力轴承装置中，其中设置有在轴上的动压产生槽或套筒的内周上的径向支承面，并且轴与套筒之间的间隙充满润滑剂，环形凹部设置在一个 与转子轮毂相邻的套筒的端面和用于覆盖凹部的盖板附接到套筒上，以便限定用于润滑剂或空气的储存器，以便防止在油膜中不存在油膜的风险 由于在接收到轴承中的空气迫使油被油流出时，流体动力轴承装置的轴承的间隙。 台阶部设置在套筒的另一端面上，使得台阶部分和储存器通过连通孔相互连通。 在流体动力轴承装置的操作期间，流体动力轴承装置中的空气经由连通孔到达储存器，以便从储存器排出。

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。

公开(公告)号：US07492548B2

公开(公告)日：2009-02-17

申请号：US10554473

申请日：2004-04-13

申请人： Takafumi Asada ,  Hiroaki Saito ,  Takao Yoshitsugu ,  Keigo Kusaka ,  Hiroyuki Kiriyama ,  Daisuke Ito

发明人： Takafumi Asada ,  Hiroaki Saito ,  Takao Yoshitsugu ,  Keigo Kusaka ,  Hiroyuki Kiriyama ,  Daisuke Ito

IPC分类号： G11B17/02

CPC分类号： F16C17/107 ,  F16C33/103 ,  F16C33/107 ,  F16C2370/12

摘要： In a hydrodynamic bearing device in which a radial bearing face having a dynamic pressure generating groove on a shaft or an inner periphery of a sleeve is provided and a clearance between the shaft and the sleeve is filled with lubricant, an annular depression is provided on one end face of the sleeve adjacent to a rotor hub and a cover plate for covering the depression is attached to the sleeve so as to define a reservoir for the lubricant or air for the purpose of preventing such a risk that absence of an oil film occurs in clearances of a bearing of the hydrodynamic bearing device due to outflow of oil upon forcing of the oil by air received into the bearing. A step portion is provided on the other end face of the sleeve such that the step portion and the reservoir are communicated with each other by a communication hole. During operation of the hydrodynamic bearing device, air in the hydrodynamic bearing device reaches the reservoir via the communication hole so as to be discharged from the reservoir.

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。

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。

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”？>

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。

公开(公告)号：US20080124013A1

公开(公告)日：2008-05-29

申请号：US11812170

申请日：2007-06-15

申请人： Takafumi Asada ,  Hiroyuki Kiriyama ,  Hiroaki Saito ,  Daisuke Ito

发明人： Takafumi Asada ,  Hiroyuki Kiriyama ,  Hiroaki Saito ,  Daisuke Ito

IPC分类号： F16C32/06

CPC分类号： F16C17/045 ,  F16C17/026 ,  F16C33/107 ,  F16C2370/12

摘要： To prevent air from being trapped inside a bearing and causing the bearing to have oil film rupture and NPPR to deteriorate. A flange having a shape substantially like a disc is provided integrally with a shaft near its lower portion. A sleeve having a bearing hole is fitted to the shaft so as to be relatively rotatable. Hydrodynamic grooves are provided on at least one of an outer periphery of the shaft and an inner periphery of the sleeve. The flange forms a thrust bearing surface with a lower end surface of the sleeve. Hydrodynamic grooves are provided on at least one of the lower surface of the sleeve and an upper surface of the flange. During rotation of the bearing, the hydrodynamic grooves circulate the lubricant. Capillary pressures at respective portions in the lubricant circulation path have difference in magnitudes. The principle that air tends to move toward the portion having a smaller capillary pressure is utilized to make it difficult for the air to be trapped inside the bearing and to smoothly discharge the air.

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NPPR变质。 具有基本上类似于盘的形状的凸缘与其下部附近的轴一体地设置。 具有轴承孔的套筒被安装在轴上以相对旋转。 流体动力槽设置在轴的外周和套筒的内周中的至少一个上。 凸缘形成具有套筒下端表面的止推轴承表面。 流体动力槽设置在套筒的下表面和凸缘的上表面中的至少一个上。 在轴承旋转期间，流体动力槽使润滑剂循环。 润滑剂循环路径各部分的毛细管压力具有不同的幅度。 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并平滑地排出空气。