公开(公告)号：US20020180289A1

公开(公告)日：2002-12-05

申请号：US10164631

申请日：2002-06-10

申请人： Sumitomo Electric Industries, Ltd.

发明人： Osamu Komura ,  Hisao Takeuchi ,  Makoto Otsuki ,  Kaoru Murabe

IPC分类号： H02K005/16 ,  H02K007/00

CPC分类号： F16C17/107 ,  F16C17/026 ,  F16C25/045 ,  F16C33/1015 ,  F16C39/063 ,  F16C2370/12 ,  G11B19/2009 ,  H02K7/086 ,  H02K7/09

摘要： There is provided a means for preventing wear caused by the contacting/sliding of a thrust hydrodynamic gas bearing surface when a spindle motor is started. A cylinder 4 of a radial hydrodynamic gas bearing that has radial hydrodynamic grooves in an outer circumferential surface thereof and a disk 3 of a thrust hydrodynamic gas bearing that has thrust hydrodynamic grooves in an upper face thereof are disposed on an upper end of an axial center of a stator core 2 having a stator 2a around which a motor coil 7 is wound, a hollow cylinder 6 whose inner surface facing the cylinder 4 of the radial hydrodynamic gas bearing is smooth and a rotor magnet 8 facing the motor coil 7 are disposed on a hub 5 acting as a rotational member, a load in a radial direction is supported by the radial hydrodynamic gas bearing, and a load in a thrust direction is supported by using the thrust hydrodynamic gas bearing together with a magnetic bearing consisting of the stator 2a and the rotor magnet 8.

公开(公告)号：US20040156569A1

公开(公告)日：2004-08-12

申请号：US10775120

申请日：2004-02-11

申请人： SUMITOMO ELECTRIC INDUSTRIES, LTD.

发明人： Hisao Takeuchi ,  Osamu Komura ,  Kaoru Murabe ,  Makoto Otsuki

IPC分类号： F16C032/06

摘要： A hydrodynamic bearing assembly with improved activation features is provided. The opposing surfaces in the radial and thrust bearings have grooves 2 and 5 with depths shallower gradually towards the downstream flow of the fluid passing therethrough, for generating the uniform dynamic pressure distribution. This allows the dynamic pressure distribution to be leveled so as to increase the bearing supporting force and prevent the dew grom being generated. Any one or both of the opposing surfaces in the thrust bearing has the inclined surface from the inner portion towards the outer portion so that the gap between the opposing surfaces is extended to about 2 microns. This causes the contacting points thereof when halted to be closer to the axis so that the friction can be reduced and the driving torque can be reduced when restating the bearing assembly. This also prevent the contact in the thrust bearing due to the external oscillating motion. Further, a second thrust plate 11 is secured on the other end surface of the sleeve 3 opposite to the thrust plate 4 so that the total weight of the rotational member is supported between the second thrust plate 11 and the end surface of the shaft 1 when halted, thereby reducing the friction at the time of activating.

摘要翻译： 提供了具有改进的激活特征的流体动力轴承组件。 径向和止推轴承中的相对表面具有凹槽2和5，其深度逐渐朝着通过其中的流体的下游流动逐渐变浅，以产生均匀的动态压力分布。 这允许动态压力分布调平以增加轴承支撑力并防止产生露水。 止推轴承中的相对表面中的任何一个或两个具有从内部部分朝向外部部分的倾斜表面，使得相对表面之间的间隙延伸到约2微米。 这使得其停止时的接触点更靠近轴线，使得当重新安装轴承组件时可以减小摩擦并且可以减小驱动扭矩。 这也防止由于外部振荡运动而导致的推力轴承的接触。 此外，第二止推板11固定在套筒3的与止推板4相对的另一端面上，使得旋转构件的总重量被支撑在第二止推板11和轴1的端面之间，当 停止，从而减少激活时的摩擦。

公开(公告)号：US20040213488A1

公开(公告)日：2004-10-28

申请号：US10852267

申请日：2004-05-25

申请人： SUMITOMO ELECTRIC INDUSTRIES, LTD.

发明人： Kaoru Murabe ,  Makoto Otsuki ,  Osamu Komura ,  Hisao Takeuchi

IPC分类号： F16C032/06

CPC分类号： F16C33/1065 ,  F16C17/026 ,  F16C17/045 ,  F16C17/107 ,  F16C23/04 ,  F16C33/102 ,  F16C2370/12 ,  G02B26/121 ,  G11B19/2009 ,  G11B19/2018 ,  H02K7/085 ,  H02K7/086

摘要： This invention is to provide a hydrodynamic bearing assembly, which realizes the high rotation rate in a stable manner and the robust rigidity. The hydrodynamic bearing assembly has a total radial gap of 3 microns or less for preventing the contact in the thrust bearing. The thrust bearing is a pomp-out type one, and the radial bearing has offset grooves on the surface thereof to supply the fluid flow sufficiently to the thrust bearing. The grooves also eliminate a half-whirl. A depth ratio relative to the diameter of bearing is preferably 0.005 or less to avoid the reduced translation rigidity. The radial gap is smoothly enlarged from the center to both ends along the axis, and the shaft is biased to incline the shaft relative to the sleeve, so that the shaft can be rotated with the robust rigidity. Also, a pair of the thrust bearings is provided on both ends of the radial bearing so as to realize the robust rigidity.

摘要翻译： 本发明提供一种流体动力轴承组件，其以稳定的方式实现高旋转速度和坚固的刚性。 流体动力轴承组件具有3微米或更小的总径向间隙，以防止推力轴承中的接触。 推力轴承是一种推力轴承，而径向轴承在其表面上具有偏移槽，以将流体流充分地提供给止推轴承。 凹槽也消除了一半的旋转。 相对于轴承的直径的深度比优选为0.005以下，以避免降低的平移刚度。 径向间隙沿着轴线从中心到两端平滑地扩大，并且轴被偏置以相对于套筒倾斜轴，使得轴能够以坚固的刚度旋转。 此外，一对推力轴承设置在径向轴承的两端，以实现坚固的刚性。