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1. 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。

2. 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.

3. 发明授权

US07830637B2 Hydrodynamic bearing device and disk rotation 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：US07830637B2
公开(公告)日：2010-11-09
申请号：US12412870
申请日：2009-03-27
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.
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。

4. 发明申请

US20060274448A1 Hydrodynamic bearing device and disk rotating apparatus 有权
公开(公告)号：US20060274448A1
公开(公告)日：2006-12-07
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. 发明授权

US07862238B2 Hydrodynamic bearing rotary device and information apparatus 有权
标题翻译：流体动力轴承旋转装置和信息装置
公开(公告)号：US07862238B2
公开(公告)日：2011-01-04
申请号：US11730144
申请日：2007-03-29
申请人： Takafumi Asada , Hiroaki Saito , Daisuke Itou , Keigo Kusaka , Hiroyuki Kiriyama
发明人： Takafumi Asada , Hiroaki Saito , Daisuke Itou , Keigo Kusaka , Hiroyuki Kiriyama
IPC分类号： F16C32/06 , F16C17/10
CPC分类号： F16C33/102 , F16C17/107 , F16C33/107 , F16C2370/12
摘要： A hydrodynamic bearing rotary device which can reduce rotation friction, and recording and reproducing apparatus including the same is provided. In the hydrodynamic bearing rotary device, such as hard disc devices, a rotary shaft having a hub on one end is provided in a bearing of a sleeve so as to be rotatable. Thrust hydrodynamic grooves are provided on the other end surface of the rotary shaft, to form a thrust bearing with the thrust plate. A communication path is provided in the sleeve. The second gap between the hub and the sleeve end surface is used as a flow channel and is connected to the communication path. In this way, the rotation friction torque of the thrust bearing can be made sufficiently small, and internal pressure in bonded portions of the rotary shaft or the bottom plate can be suppressed. Thus, the oil can be prevented from oozing out from a small space of the bonded surfaces. Furthermore, the hydrodynamic bearing can be made thin. These effects can be combined to realize an optimal hydrodynamic bearing rotary device.
摘要翻译：提供一种可以降低旋转摩擦力的流体动力轴承旋转装置，以及包括其的记录和再现装置。在诸如硬盘装置的流体动力轴承旋转装置中，一个具有一端的轮毂的旋转轴设置在套筒的轴承中以便可旋转。在旋转轴的另一端面上设置有推力液压动力槽，与止推板形成推力轴承。在套筒中提供通信路径。轮毂和套筒端面之间的第二间隙用作流动通道并连接到连通路径。以这种方式，推力轴承的旋转摩擦转矩可以变得足够小，并且可以抑制旋转轴或底板的接合部分的内部压力。因此，可以防止油从接合表面的小空间渗出。此外，流体动力轴承可以变薄。这些效果可以结合起来，实现最佳的流体动力轴承旋转装置。

6. 发明申请

US20070230840A1 Hydrodynamic bearing rotary device and information apparatus 有权
标题翻译：流体动力轴承旋转装置和信息装置
公开(公告)号：US20070230840A1
公开(公告)日：2007-10-04
申请号：US11730144
申请日：2007-03-29
申请人： Takafumi Asada , Hiroaki Saito , Daisuke Itou , Keigo Kusaka , Hiroyuki Kiriyama
发明人： Takafumi Asada , Hiroaki Saito , Daisuke Itou , Keigo Kusaka , Hiroyuki Kiriyama
IPC分类号： F16C32/06
CPC分类号： F16C33/102 , F16C17/107 , F16C33/107 , F16C2370/12
摘要： A hydrodynamic bearing rotary device which can reduce rotation friction, and recording and reproducing apparatus including the same are provided. In the hydrodynamic bearing rotary device such as hard disc devices, a rotary shaft having a hub on one end is provided in a bearing of a sleeve so as to be rotatable. Thrust hydrodynamic grooves are provided on the other end surface of the rotary shaft, to form a thrust bearing with the thrust plate. A communication path is provided in the sleeve. The second gap between the hub and the sleeve end surface is used as a flow channel and is connected to the communication path. In this way, the rotation friction torque of the thrust bearing can be made sufficiently small, and internal pressure in bonded portions of the rotary shaft or the bottom plate can be suppressed. Thus, the oil can be prevented from oozing out from a small space of the bonded surfaces. Furthermore, the hydrodynamic bearing can be made thin. These effects can be combined to realize an optimal hydrodynamic bearing rotary device.
摘要翻译：提供了能够降低旋转摩擦力的流体动力轴承旋转装置，以及包括其的记录和再现装置。在诸如硬盘装置的流体动力轴承旋转装置中，一个具有一端的轮毂的旋转轴设置在套筒的轴承中以便可旋转。在旋转轴的另一端面上设置有推力液压动力槽，与止推板形成推力轴承。在套筒中提供通信路径。轮毂和套筒端面之间的第二间隙用作流动通道并连接到连通路径。以这种方式，推力轴承的旋转摩擦转矩可以变得足够小，并且可以抑制旋转轴或底板的接合部分的内部压力。因此，可以防止油从接合表面的小空间渗出。此外，流体动力轴承可以变薄。这些效果可以结合起来，实现最佳的流体动力轴承旋转装置。

7. 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。

8. 发明授权

US07883270B2 Hydrodynamic bearing type rotary device and recording and reproducing 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：US07883270B2
公开(公告)日：2011-02-08
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： A hydrodynamic bearing type rotary device is configured to prevent air from being trapped inside a bearing and causing the bearing to have oil film rupture and NPPR to deteriorate. In the device, 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 different 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：流体动力轴承型旋转装置被构造成防止空气被捕获在轴承内并导致轴承具有油膜破裂和NPPR劣化。在该装置中，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大小。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。

9. 发明申请

US20080124013A1 Hydrodynamic bearing type rotary device and recording and reproducing apparatus including the same 有权
标题翻译：流体动力轴承型旋转装置和包括该旋转装置的记录和再现装置
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。

10. 发明授权

US07237955B2 Hydrodynamic bearing and disc rotation apparatus using the same 有权
标题翻译：流体动力轴承和使用其的盘旋转装置
公开(公告)号：US07237955B2
公开(公告)日：2007-07-03
申请号：US10727070
申请日：2003-12-02
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 , G11B19/2018
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.
摘要翻译：公开了一种高精度，长寿命的流体动力轴承，其不会导致轴承间隙中的油膜破裂和使用轴承的盘旋转装置。避免了油膜断裂，因为防止在流体动力轴承的轴和套筒之间产生负压。位于推力轴承部分和流体动力轴承的径向轴承部分的人字形动态压力产生槽被充满油并具有最佳形状。最佳形状可以防止发生负压，从而防止会导致油膜破裂的气泡凝结。保持再现/记录盘的盘旋转装置同心地固定到流体动力轴承并旋转。在盘旋转装置中旋转时，盘与磁头或光头接触。流体动力轴承和圆盘旋转装置都具有高可靠性。

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