公开(公告)号：US20100085661A1

公开(公告)日：2010-04-08

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 ,  F16C32/06

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：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：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：US20080304776A1

公开(公告)日：2008-12-11

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： F16C32/06 ,  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。

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.

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。

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。

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。

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。

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.