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1. 发明授权

US6082900A Dynamic pressure pneumatic bearing structure and method of manufacturing the same 有权
公开(公告)号：US6082900A
公开(公告)日：2000-07-04
申请号：US172000
申请日：1998-10-28
申请人： Hisao Takeuchi , Kaoru Murabe , Osamu Komura , Tomoyuki Awazu
发明人： Hisao Takeuchi , Kaoru Murabe , Osamu Komura , Tomoyuki Awazu
IPC分类号： F16C15/00 , F16C33/04 , F16C33/10 , F16C33/14 , G02B26/12 , F16C17/02
CPC分类号： G02B26/121 , F16C17/028 , F16C17/18 , F16C33/043 , F16C33/1075 , F16C33/14 , F16C3/02
摘要： Provided is a hydrodynamic gas bearing structure which can prevent occurrence of whirl not only in high-speed rotation but also in low-speed rotation, reduces such frequency that a floating rotational frequency in starting or stoppage of rotation increases, and is capable of shifting the floating rotational frequency to a low rotational frequency side. The hydrodynamic gas bearing structure comprises a shaft body (1) and a bearing body (2). A groove (11) is formed on the outer peripheral surface of the shaft body (1). The groove (11) consists of at least two concave parts, whose depths substantially differ from each other, which are formed serially in the circumferential direction, and has a circumferentially asymmetrical shape in a cross section perpendicular to the axis. The circumferential distance a between the intersection point (15) of a line (C) connecting the deepest point (14) of the groove (11) and the center (O) of the shaft body (1) and the outer peripheral line (Q) of the shaft body (1) and one edge (16) of the groove (11) positioned downward an air current (P) generated in rotation in relation to the intersection point (15) is larger than the circumferential distance b between the intersection point (15) and the other edge (17) of the groove (11) positioned upstream the air current (P) in relation to the intersection point (15). The ratio (d.sub.2 /d.sub.1) of the mean depth d.sub.2 of a relatively shallow part of the groove (11) to the mean depth d.sub.1 of a relatively deep part of the groove (11) is less than 0.3. The hydrodynamic gas bearing structure is suitable for employment for a rotation driving part of a magnetic recording apparatus or a laser beam printer.

2. 发明授权

US6123460A Hydrodynamic gas bearing structure and optical deflection scanner comprising the same 有权
标题翻译：流体动力气体轴承结构和包括其的光学偏转扫描仪
公开(公告)号：US6123460A
公开(公告)日：2000-09-26
申请号：US171999
申请日：1998-10-28
申请人： Hisao Takeuchi , Kaoru Murabe , Osamu Komura , Tomoyuki Awazu
发明人： Hisao Takeuchi , Kaoru Murabe , Osamu Komura , Tomoyuki Awazu
IPC分类号： F16C15/00 , F16C33/04 , F16C33/10 , F16C33/14 , G02B26/12 , F16C32/06
CPC分类号： G02B26/121 , F16C17/028 , F16C17/18 , F16C33/043 , F16C33/1075 , F16C33/14 , F16C3/02
摘要： A hydrodynamic gas bearing structure can prevent the occurrence of whirl not only in high-speed rotation but also in low-speed rotation, and is capable of suppressing dispersion of a floating rotational frequency. The hydrodynamic gas bearing structure includes a shaft body (1) and a bearing body (2). A groove (11) is formed on the outer peripheral surface of the shaft body (1). The groove (11) consists of at least two concave parts, of which the depths substantially differ from each other, which are formed serially in the circumferential direction, and which each have a circumferentially asymmetrical shape in a cross section perpendicular to the axis. A circumferential distance a is defined between the intersection point (15) of the outer circular peripheral line (Q) of the shaft body and a line (C) connecting the deepest point (14) of the groove (11) with the center (O) of the shaft body (1), and one edge (16) of the groove (11) positioned downstream with respect to an air current (P) generated during rotation in relation to the intersection point (15). This circumferential distance a is larger than the circumferential distance b between the intersection point (15) and the other edge (17) of the groove (11) positioned upstream with respect to the air current (P) in relation to the intersection point (15). The hydrodynamic gas bearing structure is employed for a rotation driving part of an optical deflection scanner.
摘要翻译： PCT No.PCT / JP98 / 00740 Sec。 371 1998年10月28日第 102（e）1998年10月28日PCT PCT日期：1998年2月23日PCT公布。第WO98 / 38434号公报日期1998年9月3日流体动力气体轴承结构不仅可以防止在高速旋转中而且在低速旋转中产生旋转，并且能够抑制浮动旋转频率的分散。流体动力气体轴承结构包括轴体（1）和轴承体（2）。在轴体（1）的外周面形成有槽（11）。凹槽（11）由至少两个凹部构成，其深度基本上彼此不同，它们在圆周方向上串联形成，并且在与轴线垂直的横截面中各具有周向不对称的形状。圆周距离a限定在轴体的外圆周线（Q）的交点（15）与将槽（11）的最深点（14）与中心（O）连接的线（C）之间）和相对于相对于交点（15）旋转期间产生的气流（P））位于下游的凹槽（11）的一个边缘（16）。该圆周距离a大于相对于交点（15）位于相对于气流（P）的上游的槽（11）的交点（15）和另一边缘（17）之间的圆周距离b ）。流体动力气体轴承结构用于光学偏转扫描器的旋转驱动部分。

3. 发明申请

US20080170815A1 Hydrodynamic bearing assembly 审中-公开
标题翻译：流体动力轴承总成
公开(公告)号：US20080170815A1
公开(公告)日：2008-07-17
申请号：US12073919
申请日：2008-03-12
申请人： Kaoru Murabe , Makoto Otsuki , Osamu Komura , Hisao Takeuchi
发明人： Kaoru Murabe , Makoto Otsuki , Osamu Komura , Hisao Takeuchi
IPC分类号： F16C32/06
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 provides a hydrodynamic bearing assembly which realizes a high rotation rate in a stable manner with robust rigidity. The hydrodynamic bearing assembly has a total radial gap of 3 microns or less for preventing contact with the thrust bearing. The thrust bearing is a pump-out type, and the radial bearing has offset grooves on the surface thereof to supply fluid flow to the thrust bearing. A depth ratio of the grooves relative to the diameter of the shaft is preferably 0.005 or less to avoid reduced translational rigidity.
摘要翻译：本发明提供了一种流体动力轴承组件，其以稳定的方式实现高转速，具有坚固的刚性。流体动力轴承组件具有3微米或更小的总径向间隙，以防止与推力轴承接触。推力轴承是抽出式的，径向轴承在其表面上具有偏移槽，以向推力轴承提供流体流。凹槽相对于轴的直径的深度比优选为0.005或更小，以避免降低的平移刚性。

4. 发明授权

US06702464B1 Dynamic pressure bearing with improved starting characteristics 失效
公开(公告)号：US06702464B1
公开(公告)日：2004-03-09
申请号：US09856093
申请日：2001-08-16
申请人： Hisao Takeuchi , Osamu Komura , Kaoru Murabe , Makoto Otsuki
发明人： Hisao Takeuchi , Osamu Komura , Kaoru Murabe , Makoto Otsuki
IPC分类号： F16C1710
CPC分类号： F16C33/107 , F16C17/045 , F16C2370/12 , G02B26/121 , G11B19/2009 , H02K7/086
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.

5. 发明授权

US06417590B1 Spindle motor 有权
标题翻译：主轴电机
公开(公告)号：US06417590B1
公开(公告)日：2002-07-09
申请号：US09786861
申请日：2001-03-12
申请人： Osamu Komura , Hisao Takeuchi , Makoto Otsuki , Kaoru Murabe
发明人： Osamu Komura , Hisao Takeuchi , Makoto Otsuki , Kaoru Murabe
IPC分类号： H02K708
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.
摘要翻译：提供了一种用于在主轴电动机起动时防止由推力流体动力气体轴承表面的接触/滑动引起的磨损的装置。径向流体动力气体轴承的圆柱体4设置在轴向中心的上端，径向流体动力气体轴承在其外圆周表面中具有径向流体动力槽，并且具有在其上表面具有推力流体动力槽的推力流体动力气体轴承的盘3 定子铁芯2具有卷绕电动机线圈7的定子2a，与径向流体动力气体轴承的气缸4相对的内表面平滑的中空圆筒6和面向电机线圈7的转子磁体8设置在用作旋转构件的轮毂5，径向载荷由径向流体动力气体轴承支撑，并且通过使用推力流体动力气体轴承以及由定子2a组成的磁性轴承来支撑推力方向的负载和转子磁体8。

6. 发明授权

US07033078B2 Hydrodynamic bearing assembly and spindle motor having the same 失效
标题翻译：流体动力轴承组件和主轴电机具有相同的功能
公开(公告)号：US07033078B2
公开(公告)日：2006-04-25
申请号：US10852267
申请日：2004-05-25
申请人： Kaoru Murabe , Makoto Otsuki , Osamu Komura , Hisao Takeuchi
发明人： Kaoru Murabe , Makoto Otsuki , Osamu Komura , Hisao Takeuchi
IPC分类号： F16C32/06
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。

7. 发明授权

US06749339B1 Hydrodynamic bearing assembly and spindle motor having the same 有权
标题翻译：流体动力轴承组件和主轴电机具有相同的功能
公开(公告)号：US06749339B1
公开(公告)日：2004-06-15
申请号：US09830997
申请日：2001-08-07
申请人： Kaoru Murabe , Makoto Otsuki , Osamu Komura , Hisao Takeuchi
发明人： Kaoru Murabe , Makoto Otsuki , Osamu Komura , Hisao Takeuchi
IPC分类号： F16C3206
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。

8. 发明授权

US07360950B2 Hydrodynamic bearing assembly 有权
公开(公告)号：US07360950B2
公开(公告)日：2008-04-22
申请号：US11293103
申请日：2005-12-05
申请人： Kaoru Murabe , Makoto Otsuki , Osamu Komura , Hisao Takeuchi
发明人： Kaoru Murabe , Makoto Otsuki , Osamu Komura , Hisao Takeuchi
IPC分类号： F16C32/06
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 provides a hydrodynamic bearing assembly which realizes a high rotation rate in a stable manner with robust rigidity. The hydrodynamic bearing assembly has a total radial gap of 3 microns or less for preventing contact with the thrust bearing. The thrust bearing is a pump-out type, and the radial bearing has offset grooves on the surface thereof to supply fluid flow to the thrust bearing. A depth ratio of the grooves relative to the diameter of the shaft is preferably 0.005 or less to avoid reduced translational rigidity.

9. 发明申请

US20060072864A1 Htdrodynamic bearing assembly and spindle motor having the same 有权
标题翻译： HTDR动力轴承组件和主轴电机具有相同的功能
公开(公告)号：US20060072864A1
公开(公告)日：2006-04-06
申请号：US11293103
申请日：2005-12-05
申请人： Kaoru Murabe , Makoto Otsuki , Osamu Komura , Hisao Takeuchi
发明人： Kaoru Murabe , Makoto Otsuki , Osamu Komura , Hisao Takeuchi
IPC分类号： F16C32/06
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。

10. 发明授权

US06608415B2 Spindle motor 有权
公开(公告)号：US06608415B2
公开(公告)日：2003-08-19
申请号：US10164631
申请日：2002-06-10
申请人： Osamu Komura , Hisao Takeuchi , Makoto Otsuki , Kaoru Murabe
发明人： Osamu Komura , Hisao Takeuchi , Makoto Otsuki , Kaoru Murabe
IPC分类号： H02K708
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.

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