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1. 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.

2. 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

3. 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。

4. 发明授权

US07196868B2 Hydrodynamic bearing and disk recording/reproducing apparatus having a vent inside a fixed shaft 失效
标题翻译：流体动力轴承和盘记录/重放装置，其具有在固定轴内的排气口
公开(公告)号：US07196868B2
公开(公告)日：2007-03-27
申请号：US10725150
申请日：2003-12-01
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： G11B17/08 , G11B17/02
CPC分类号： F16C33/107 , F16C17/107 , F16C2370/12 , G11B17/038 , G11B19/2009
摘要： Radial dynamic pressure grooves are provided in a first region 4A and a second region 4B on the side of a fixed shaft 2. A vent 2D is provided inside the top end 2A of the fixed shaft 2. The vent 2D connects spaces over and under a flange 3 to each other. The flange 3 in an annular shape is fixed at the top end 2A of the fixed shaft 2. Thrust dynamic pressure grooves 3A and 3B are provided on the surfaces of the flange 3. A circulation hole 3C is provided in the flange 3, and connects spaces over and under the flange 3 to each other. A sleeve 4 revolves around the fixed shaft 2. A thrust plate 6 in an annular shape is fixed at the top of the sleeve 4 and opposed to the flange 3. The first region 4A, the second region 4B, the thrust dynamic pressure grooves 3A and 3B, and the circulation hole 3C of the flange 3 are filled with a lubricant 7. At the revolution of the sleeve 4, the lubricant 7 is concentrated in each central part of the first region 4A, the second region 4B, and the thrust dynamic pressure grooves 3A and 3B and their vicinities, then raising the pressure. The sleeve 4 keeps its stable high-speed revolution, avoiding contact with the fixed shaft 2. The lubricant 7 circulates on surfaces of the flange 3 through the circulation hole 3C.
摘要翻译：径向动压槽设置在固定轴2一侧的第一区域4A和第二区域4B中。在固定轴2的顶端部2A内设置有排气口D D。通风口2 D将法兰3上方和下方的空间相互连接。环状的凸缘3固定在固定轴2的顶端部2A。在凸缘3的表面设置有推力动压槽3A和3B。在凸缘3中设置有循环孔3C，并且将凸缘3上方和下方的空间彼此连接。套筒4围绕固定轴2旋转。环形的止推板6固定在套筒4的顶部并与凸缘3相对。第一区域4A，第二区域4B，推力动压力槽3A和3B以及凸缘3的循环孔3C填充有润滑剂7。在套筒4的旋转时，润滑剂7集中在第一区域4A，第二区域4B和推力动压力槽3A和3B的各个中心部分及其附近，然后升高压力。套筒4保持其稳定的高速旋转，避免与固定轴2接触。润滑剂7通过循环孔C3在凸缘3的表面上循环。

5. 发明授权

US07011450B2 Fluid dynamic bearing device and motor including the device 失效
标题翻译：流体动力轴承装置和电动机包括装置
公开(公告)号：US07011450B2
公开(公告)日：2006-03-14
申请号：US10724046
申请日：2003-12-01
申请人： Keigo Kusaka , Daisuke Itou , Hiroaki Saito , Takafumi Asada , Yasuhiro Asaida
发明人： Keigo Kusaka , Daisuke Itou , Hiroaki Saito , Takafumi Asada , Yasuhiro Asaida
IPC分类号： F16C32/06
CPC分类号： F16C17/107 , F16C33/107 , F16C33/1085 , F16C2370/12 , G11B19/2018
摘要： A fluid dynamic bearing device including a shaft having an interior pressure regulating hole by which a center portion of a thrust surface confronting a thrust plate and a lubricant pool portion of an inner circumferential surface of a sleeve are communicated with each other. Thus, the device is capable of obtaining stable thrust floating characteristics and preventing leaks of the lubricant as well as exhaustion of the lubricant.
摘要翻译：一种流体动力轴承装置，包括具有内部压力调节孔的轴，通过该内部压力调节孔将推力板的中心部分与推力板的内周面的润滑剂池部分相互连通。因此，该装置能够获得稳定的推力浮动特性并防止润滑剂的泄漏以及润滑剂的耗尽。

6. 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。

7. 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。

8. 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。

9. 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.

10. 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。

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