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：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：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：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：US20090060403A1

公开(公告)日：2009-03-05

申请号：US12187689

申请日：2008-08-07

申请人： Tsutomu HAMADA ,  Katsuo ISHIKAWA ,  Takafumi ASADA

发明人： Tsutomu HAMADA ,  Katsuo ISHIKAWA ,  Takafumi ASADA

IPC分类号： F16C32/06

CPC分类号： F16C33/12 ,  F16C33/107 ,  F16C33/122 ,  F16C2370/12

摘要： A sleeve for a hydrodynamic bearing device, a hydrodynamic bearing device equipped with the sleeve, a spindle motor, information recording and reproducing and processing apparatus, and a method for manufacturing a sleeve for a hydrodynamic bearing device are provided that are capable of reducing costs through appropriate sealing treatment.The sleeve for a hydrodynamic bearing device has an inner layer and a surface layer. The inner layer is formed by sintering metal powder for sintering use. The surface layer is formed on a surface of the inner layer and includes diiron trioxide (Fe2O3). Sealing treatment is carried out by forming a surface layer including diiron trioxide (Fe2O3) on a surface of a sleeve for a hydrodynamic bearing device that is porous.

摘要翻译： 用于流体动力轴承装置的套筒，装备有套筒的流体动力轴承装置，主轴电动机，信息记录和再现和处理装置以及用于制造用于流体动力轴承装置的套筒的方法，其能够通过 适当的密封处理。 用于流体动力轴承装置的套筒具有内层和表面层。 内层通过烧结用于烧结的金属粉末形成。 表面层形成在内层的表面上，并且包括三氧化二铁（Fe 2 O 3）。 通过在多孔的流体动力轴承装置的套筒的表面上形成包含三氧化二铁（Fe 2 O 3）的表面层进行密封处理。

公开(公告)号：US20110044837A1

公开(公告)日：2011-02-24

申请号：US12877341

申请日：2010-09-08

申请人： Tsutomu HAMADA ,  Takafumi ASADA ,  Katsuo ISHIKAWA

发明人： Tsutomu HAMADA ,  Takafumi ASADA ,  Katsuo ISHIKAWA

IPC分类号： B22F3/26 ,  B22F3/12 ,  B22F3/24

CPC分类号： F16C33/14 ,  F16C17/107 ,  F16C2220/20 ,  F16C2220/60 ,  F16C2223/04 ,  F16C2223/08 ,  F16C2370/12

摘要： A bearing stiffness of a sintered metal sleeve is prevented from lowering. A sleeve includes an inner section formed of metal powder for sintering and a resin for impregnation, and a surface deformation section which covers a surface of the inner section and is formed by shot blast process. Since the surface deformation section is formed by the shot blast process, the number of pores formed between the metal powder for sintering near the surface can be reduced. In this way, a supporting pressure at a bearing portion can be prevented from being released out through the pores, and the bearing stiffness can be prevented from lowering.

摘要翻译： 防止烧结金属套筒的轴承刚度降低。 套筒包括由用于烧结的金属粉末形成的内部部分和用于浸渍的树脂，以及覆盖内部部分的表面并通过喷丸处理形成的表面变形部分。 由于通过喷丸法形成表面变形部，因此可以减少在表面附近烧结用金属粉末之间形成的细孔数。 以这种方式，可以防止轴承部分处的支撑压力通过孔排出，并且可以防止轴承刚度的降低。