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1. 发明授权

US06760187B2 Hydrodynamic bearing and disk apparatus 失效
标题翻译：流体动力轴承和圆盘装置
公开(公告)号：US06760187B2
公开(公告)日：2004-07-06
申请号：US10170752
申请日：2002-06-13
申请人： Takafumi Asada , Hiroaki Saito , Hideaki Ohno
发明人： Takafumi Asada , Hiroaki Saito , Hideaki Ohno
IPC分类号： G11B1702
CPC分类号： F16C33/107 , F16C17/107 , F16C33/103 , F16C2240/46 , F16C2240/70 , F16C2370/12 , G11B19/2009
摘要： In a hydrodynamic bearing according to the present invention a fixed shaft has different diameter sizes by positions so that overflow or splashing of lubricant out of the apparatus is prevented due to a centrifugal force during high-speed rotation, and lubricant reservoirs are provided in narrower clearances and in wider clearances so that the lubricant is induced to move toward lubricant reservoirs in narrower clearances due to surface tension while the hydrodynamic bearing is in stop, therefore overflow of the lubricant is prevented at the time of starting up.
摘要翻译：在根据本发明的流体动力轴承中，固定轴通过位置具有不同的直径尺寸，使得由于高速旋转期间的离心力而防止润滑剂从设备中溢出或飞溅，并且在较窄的间隙中提供润滑剂储存器并且在更宽的间隙中，使得润滑剂由于表面张力而在更窄的间隙中朝向润滑剂储存器移动，同时流体动力轴承停止，因此在启动时防止润滑剂的溢出。

2. 发明授权

US07589934B2 Hydrodynamic bearing device and disk rotating apparatus 失效
标题翻译：流体动力轴承装置和盘旋转装置
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。

3. 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。

4. 发明授权

US07492548B2 Hydrodynamic bearing device and disk rotating apparatus 有权
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.

5. 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。

6. 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。

7. 发明授权

US07237956B2 Hydrodynamic bearing and disc rotation apparatus using the same 有权
公开(公告)号：US07237956B2
公开(公告)日：2007-07-03
申请号：US10727860
申请日：2003-12-04
申请人： Takafumi Asada , Hiroaki Saito , Keigo Kusaka , Daisuke Itou
发明人： Takafumi Asada , Hiroaki Saito , Keigo Kusaka , Daisuke Itou
IPC分类号： F16C32/06
CPC分类号： F16C33/107 , F16C17/045 , F16C17/107 , F16C2370/12
摘要： A high-accuracy, long-life hydrodynamic bearing that does not cause oil film breakage in bearing clearances and a disc rotation apparatus using the bearing is disclosed. Oil film breakage is avoided as negative pressure is prevented from generating between the shaft and sleeve of the hydrodynamic bearing. Herringbone shaped dynamic pressure generating grooves, located on the thrust bearing section and the radial bearing section of the hydrodynamic bearing, are oil filled and have optimum shapes. The optimum shapes prevent the generation negative pressure and thus prevents the coagulation of air bubbles that can cause oil film breakage. The disc rotation apparatus, that holds a reproduction/recording disc, is concentrically secured to the hydrodynamic bearing and rotated. The disc is put into contact with magnetic or optical heads while rotating in the disc rotation apparatus. Both the hydrodynamic bearing and the disc rotation apparatus experience high reliability.

8. 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”？>

9. 发明授权

US07102851B2 Hydrodynamic bearing and disk recording/reproducing apparatus 有权
标题翻译：流体动力轴承和盘记录/再现装置
公开(公告)号：US07102851B2
公开(公告)日：2006-09-05
申请号：US10727448
申请日：2003-12-03
申请人： Takafumi Asada , Hiroaki Saito , Keigo Kusaka , Daisuke Itou
发明人： Takafumi Asada , Hiroaki Saito , Keigo Kusaka , Daisuke Itou
IPC分类号： G11B17/02
CPC分类号： F16C33/102 , F16C17/107 , F16C33/107 , F16C33/74 , F16C2370/12 , G11B19/2009
摘要： A sleeve 1 is fixed on a base. Radial dynamic-pressure generating grooves 1A and 1B are provided on an inner surface of the sleeve 1. A thrust plate 4 hermetically seals a lower opening end of the sleeve 1. A shaft 2 is inserted inside the sleeve 1, being allowed to revolve. A flange 3 is fixed at the bottom end of the shaft 2, and its lower surface is placed close to an upper surface of the thrust plate 4. Thrust dynamic-pressure generating grooves 3A and 3B are provided on the surfaces of the flange 3. Gaps A–H among the sleeve 1, the shaft 2, the flange 3, and the thrust plate 4 are filled with a lubricant 5. Hollows 1C–1F are provided on the inner surface of the sleeve 1. The gaps A and C over the thrust dynamic-pressure generating grooves 3A and 3B and their vicinities are narrower than the surrounding gaps B and D (A
摘要翻译：套筒1固定在基座上。径向动压产生槽1A和1B设置在套筒1的内表面上。止推板4气密地密封套筒1的下开口端。轴2插入套筒1内，允许旋转。凸缘3固定在轴2的底端，其下表面靠近推力板4的上表面放置。在凸缘3的表面上设置有推力动压发生槽3A和3B。套筒1，轴2，凸缘3和推力板4之间的间隙A-H填充有润滑剂5。在套筒1的内表面上设置空腔1C-1F。推力动压发生槽3 A和3 B及其附近的间隙A和C比周围间隙B和D（A

10. 发明申请

US20060029312A1 Hydrodynamic bearing device, motor and disc driving apparatus 审中-公开
标题翻译：流体动力轴承装置，电动机和盘驱动装置
公开(公告)号：US20060029312A1
公开(公告)日：2006-02-09
申请号：US11194551
申请日：2005-08-02
申请人： Hiroyuki Kiriyama , Takao Yoshitsugu , Takafumi Asada , Hiroaki Saito
发明人： Hiroyuki Kiriyama , Takao Yoshitsugu , Takafumi Asada , Hiroaki Saito
IPC分类号： F16C32/06
CPC分类号： F16C33/103 , F16C2370/12 , H02K5/1677
摘要： An object of the present invention is to provide a hydrodynamic bearing device having a high reliability which can achieve miniaturization and reduction of weight and thickness, and a motor and a disc driving apparatus using the same. In the hydrodynamic bearing device according to the present invention, a sleeve through which a shaft penetrates has a first opposing surface substantially orthogonal to a central axis of the shaft at one end and has a second opposing surface at the other end. A thrust plate having a disc shape which is fixed near one end of the shaft or which is integrally formed with the shaft is positioned so as to oppose the first opposing surface of the sleeve. A seal plate positioned near the other end of the shaft is positioned with a gap to the second opposing surface of the sleeve.
摘要翻译：本发明的目的是提供一种具有高可靠性的流体动力轴承装置，其可以实现重量和厚度的小型化和减小，以及使用其的电动机和盘驱动装置。在根据本发明的流体动力轴承装置中，轴穿过的套筒具有在一端处基本上垂直于轴的中心轴线的第一相对表面，并且在另一端具有第二相对表面。具有固定在轴的一端附近或与轴一体形成的圆盘形状的止推板被定位成与套筒的第一相对表面相对。位于轴的另一端附近的密封板定位成与套筒的第二相对表面具有间隙。

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