公开(公告)号：US20100052447A1

公开(公告)日：2010-03-04

申请号：US12548855

申请日：2009-08-27

申请人： Yosuke KADOYA ,  Takafumi Asada ,  Tsutomu Hamada ,  Katsuo Ishikawa

发明人： Yosuke KADOYA ,  Takafumi Asada ,  Tsutomu Hamada ,  Katsuo Ishikawa

IPC分类号： H02K5/167 ,  F16C32/06

摘要： The hydrodynamic bearing device has a sleeve composed of a sintered material and having a compression-absorbing space inside the sleeve, the sleeve having a bearing hole in the center thereof; a shaft rotatably inserted into the bearing hole; a bearing portion formed between the bearing hole and the shaft; a hydrodynamic groove formed on at least one of the internal peripheral surface of the bearing hole and the external peripheral surface of the shaft; a concavity having one or more steps and formed to one end of the sleeve in the axial direction; a convexity formed to the other end of the sleeve in the axial direction, the convexity having a shape similar to the concavity; and a lubricating fluid filled in the gap of the bearing portion. The hydrodynamic bearing device has a readily obtainable predetermined shape precision, the internal density of the sintered material is made uniform, and lubricating fluid therein does not leak from the surface.

摘要翻译： 流体动力轴承装置具有由烧结材料构成的套筒，在套筒内部具有压缩吸收空间，套筒的中心具有轴承孔; 可旋转地插入到所述轴承孔中的轴; 形成在所述轴承孔和所述轴之间的轴承部; 形成在所述轴承孔的内周面和所述轴的外周面的至少一个上的流体动力槽; 具有一个或多个台阶并且沿轴向方向形成在套筒的一端的凹面; 在轴向方向上形成于套筒另一端的凸部，凸部具有与凹部相似的形状; 以及填充在轴承部分的间隙中的润滑流体。 流体动力轴承装置具有容易获得的预定形状精度，烧结材料的内部密度均匀，并且其中的润滑流体不会从表面泄漏。

公开(公告)号：US20070092171A1

公开(公告)日：2007-04-26

申请号：US11521362

申请日：2006-09-15

申请人： Takafumi Asada ,  Tsutomu Hamada ,  Masato Morimoto ,  Katsuo Ishikawa

发明人： Takafumi Asada ,  Tsutomu Hamada ,  Masato Morimoto ,  Katsuo Ishikawa

IPC分类号： F16C32/06

摘要： A hydrodynamic bearing having a high performance and a long life and a manufacturing method for the same are provided by forming hydrodynamic grooves to have a sufficient depth with a high accuracy, and sealing remaining pores on a bearing surface. A shaft is inserted into a bearing hole of a sleeve so as to be relatively rotatable. The bearing hole has a bearing surface having hydrodynamic grooves. The sleeve is formed by: forming metal powder to have a hollow cylindrical shape, sintering the metal powder; inserting a core rod in a pattern having a tapered surface into a bore of the sintered metal material; forming an inner surface having hydrodynamic grooves by pressing the sintered metal material from upper, lower and outer peripheral direction; inserting a core rod having a wide diameter portion and a narrow diameter portion into the bore of the sintered metal material to form the bearing bore surface of a hydrodynamic groove with the small diameter portion and to form the sleeve inner surface with the wide diameter portion at the same time; and removing the core rod from bore of the sintered metal material to have the inner periphery formed as such as the bearing inner surface and a large diameter portion as a lubricating fluid reservoir. Thus, grooves can be processed with a high accuracy.

摘要翻译： 具有高性能和长寿命的流体动力轴承及其制造方法通过以高精度形成流体动力槽以具有足够的深度并且在轴承表面上密封剩余的孔来提供。 将轴插入到套筒的轴承孔中以相对旋转。 轴承孔具有具有流体动力槽的支承表面。 该套筒通过以下方式形成：将金属粉末形成为具有中空圆柱形状，烧结金属粉末; 将具有锥形表面的图案的芯棒插入所述烧结金属材料的孔中; 通过从上，下和外周向压制烧结金属材料形成具有流体动力槽的内表面; 将具有宽直径部分和窄直径部分的芯棒插入烧结金属材料的孔中以形成具有小直径部分的流体动力槽的轴承孔表面，并且形成具有宽直径部分的套筒内表面 同一时间; 并且将所述芯棒从所述烧结金属材料的孔中移除以使得所述内周形成为所述轴承内表面，并且所述大直径部分形成为润滑油储存器。 因此，可以高精度地加工凹槽。

公开(公告)号：US20090073596A1

公开(公告)日：2009-03-19

申请号：US12169474

申请日：2008-07-08

申请人： Takafumi Asada ,  Tsutomu Hamada ,  Katsuo Ishikawa

发明人： Takafumi Asada ,  Tsutomu Hamada ,  Katsuo Ishikawa

IPC分类号： G11B5/02 ,  F16C17/10 ,  H02K15/14

摘要： A hydrodynamic bearing device comprises a sleeve composed of a sintered member, a shaft that is inserted in a state of being capable of relative rotation into a bearing hole provided to the sleeve, and a hydrodynamic groove formed in the outer peripheral surface of the shaft and/or the inner peripheral surface of the sleeve. The sleeve has a surface porosity of 1.5% or less, and the ridge width is at least 0.10 mm.

摘要翻译： 流体动力轴承装置包括由烧结构件构成的套筒，以能够相对旋转到设置于套筒的轴承孔的状态插入的轴和形成在轴的外周面中的流体动力槽， /或套筒的内周面。 套筒的表面孔隙率为1.5％以下，脊宽度为0.10mm以上。

公开(公告)号：US20070047857A1

公开(公告)日：2007-03-01

申请号：US11509770

申请日：2006-08-25

申请人： Tsutomu Hamada ,  Takafumi Asada ,  Katsuo Ishikawa

发明人： Tsutomu Hamada ,  Takafumi Asada ,  Katsuo Ishikawa

IPC分类号： F16C33/02 ,  F16C32/06

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。

公开(公告)号：US20060008190A1

公开(公告)日：2006-01-12

申请号：US11175311

申请日：2005-07-07

申请人： Tsutomu Hamada ,  Takafumi Asada

发明人： Tsutomu Hamada ,  Takafumi Asada

IPC分类号： F16C32/06 ,  C22C38/36

CPC分类号： F16C33/107 ,  F16C17/107 ,  F16C33/12 ,  F16C2204/60

摘要： A fluid dynamic bearing device is disclosed in which, in the materials used for the sleeve of the fluid dynamic bearing device, particles of free-cutting elements and free-cutting alloys added to iron-based free-cutting steel, ferrite-based free-cutting stainless steel, and so on are reduced in size to about 0.1 to 0.5 μm. The result is smaller crystals of free-cutting alloy, and particularly manganese sulfide, on the inner peripheral face of the bearing hole of the sleeve made of free-cutting steel, which makes the inner peripheral face of the sleeve smoother. Also, the carbon content of free-cutting steel is kept to 0.1% or less, which lowers the hardness of the material and extends the service life of the tool used to cut the dynamic pressure generation grooves.

摘要翻译： 公开了一种流体动力轴承装置，其中在用于流体动力轴承装置的套筒的材料中，添加到铁基自由切削钢中的自由切削元件和自由切削合金颗粒， 切割不锈钢等的尺寸减小到约0.1至0.5μm。 结果是由切削钢制成的套筒的轴承孔的内周面上形成较小的自由切削合金的结晶，特别是硫化锰，这使得套筒的内周面更平滑。 此外，易切削钢的碳含量保持在0.1％以下，这降低了材料的硬度并延长了用于切割动压产生槽的工具的使用寿命。

公开(公告)号：US20050201645A1

公开(公告)日：2005-09-15

申请号：US11071212

申请日：2005-03-04

申请人： Takafumi Asada ,  Tsutomu Hamada ,  Hideaki Ohno ,  Yasunori Tokunou

发明人： Takafumi Asada ,  Tsutomu Hamada ,  Hideaki Ohno ,  Yasunori Tokunou

IPC分类号： F16C17/10 ,  B25G3/02 ,  F16C33/12 ,  F16C33/20 ,  G11B19/20 ,  H02K5/167 ,  H02K7/08

CPC分类号： F16C17/107 ,  F16C33/1025 ,  F16C2370/12 ,  Y10S384/902

摘要： A hydrodynamic bearing device capable of inhibiting leakage of a working fluid to an outside of a bearing and preventing reduction in radial bearing rigidity, and capable of keeping a gap between a thrust bearing and a radial bearing favorable and rotating stably. The hydrodynamic bearing device includes a shaft relatively rotatably inserted into a bearing hole of a sleeve, a radial bearing surface having dynamic pressure generating grooves formed on at least one of an outer peripheral surface of the shaft and an inner peripheral surface of the sleeve, and a gap filled with a working fluid between the shaft and the sleeve. The shaft is made of high manganese chrome steel or stainless steel, and the sleeve is entirely made of sintered metal of metal particles including at least 60% by weight of iron or copper. Resin, metal or water glass is impregnated in pores on a surface of the sintered metal and cured. Thereby, leakage of the working fluid to the outside of the bearing from the sleeve can be inhibited, and reduction in the pressure inside the bearing can be prevented.

摘要翻译： 一种流体动力轴承装置，其能够抑制工作流体泄漏到轴承的外部，并且防止径向轴承刚性的降低，并且能够使推力轴承和径向轴承之间的间隙保持良好并且稳定地旋转。 流体动力轴承装置包括相对可旋转地插入到套筒的轴承孔中的轴，具有形成在轴的外周表面和套筒的内周表面中的至少一个上的动压产生槽的径向支承表面，以及 在轴和套筒之间填充有工作流体的间隙。 该轴由高锰铬钢或不锈钢制成，并且套筒全部由包含至少60重量％的铁或铜的金属颗粒的烧结金属制成。 将树脂，金属或水玻璃浸渍在烧结金属表面上的孔中并固化。 由此，可以抑制工作流体从套筒向轴承外侧的泄漏，能够防止轴承内的压力的降低。

公开(公告)号：US20090155116A1

公开(公告)日：2009-06-18

申请号：US12393514

申请日：2009-02-26

申请人： Tsutomu Hamada ,  Takafumi Asada ,  Hideaki Ohno

发明人： Tsutomu Hamada ,  Takafumi Asada ,  Hideaki Ohno

IPC分类号： B22F3/12 ,  B22F3/11

CPC分类号： F16C33/107 ,  F16C17/107 ,  F16C33/103 ,  F16C2370/12

摘要： A hydrodynamic bearing device is provided for use with a spindle motor. The hydrodynamic bearing device has a sleeve made of a sintered metal that is obtained by sintering a sintering material that is iron, an iron alloy, copper, a copper alloy or a mixture thereof. This sintered metal has independent pores, which do not communicate with each other, by selecting conditions for forming a desired sintered body within a predetermined range. The conditions includes a grain size of powdered metal of a material for the sintered metal, a molding pressure when the molded body is formed, sintering temperature and sintering period in the sintering step.

公开(公告)号：US07513689B2

公开(公告)日：2009-04-07

申请号：US11195813

申请日：2005-08-03

申请人： Tsutomu Hamada ,  Takafumi Asada ,  Hideaki Ohno

发明人： Tsutomu Hamada ,  Takafumi Asada ,  Hideaki Ohno

IPC分类号： F16C32/06

CPC分类号： F16C33/107 ,  F16C17/107 ,  F16C33/103 ,  F16C2370/12

摘要： A hydrodynamic bearing device is provided for use with a spindle motor. The hydrodynamic bearing device has a sleeve made of a sintered metal that is obtained by sintering a sintering material that is iron, an iron alloy, copper, a copper alloy or a mixture thereof. This sintered metal has independent pores, which do not communicate with each other, by selecting conditions for forming a desired sintered body within a predetermined range. The conditions includes a grain size of powdered metal of a material for the sintered metal, a molding pressure when the molded body is formed, sintering temperature and sintering period in the sintering step.

摘要翻译： 提供一种用于主轴电机的流体动力轴承装置。 流体动力轴承装置具有通过烧结作为铁，铁合金，铜，铜合金或其混合物的烧结材料而获得的烧结金属制的套筒。 该烧结金属通过选择在预定范围内形成所需烧结体的条件，具有不相互连通的独立孔。 条件包括烧结金属材料的金属粉末的粒度，成型体的成形压力，烧结温度和烧结时间。

公开(公告)号：US20050169561A1

公开(公告)日：2005-08-04

申请号：US10512662

申请日：2004-03-10

申请人： Takafumi Asada ,  Tsutomu Hamada ,  Hideaki Ohno ,  Keigo Kusaka

发明人： Takafumi Asada ,  Tsutomu Hamada ,  Hideaki Ohno ,  Keigo Kusaka

IPC分类号： F16C17/10 ,  F16C33/10 ,  F16C33/12 ,  F16C32/06

CPC分类号： F16C33/107 ,  F16C17/026 ,  F16C17/107 ,  F16C33/12 ,  F16C2370/12

摘要： In order to suppress the increase of torque loss at low temperature and the increase of shaft swinging at high temperature and to improve the workability of the sleeve, high manganese chromium steel or austenitic stainless steel is used as the material of the shaft, sulfur free-machining steel is used as the material of the sleeve, and the surface thereof is coated with plating primarily containing nickel and phosphorus. Hence, it is possible to obtain a hydrodynamic bearing wherein the changes in the characteristics of the bearing owing to the change in the viscosity of a lubricant depending on temperature change can be prevented, in addition, the workability of the sleeve and the dynamic pressure generation grooves and the wear resistance of the bearing can be made best.

摘要翻译： 为了抑制低温下的扭矩损失的增加和高温时的轴摆动的增加，提高套筒的加工性，使用高锰铬钢或奥氏体不锈钢作为轴的材料， 使用加工钢作为套筒的材料，其表面涂覆有主要含有镍和磷的电镀。 因此，可以获得流体动力轴承，其中可以防止由于根据温度变化导致的润滑剂的粘度变化导致的轴承特性的变化，此外，可以防止套筒的可加工性和动压产生 凹槽和轴承的耐磨性能最好。

公开(公告)号：US5810480A

公开(公告)日：1998-09-22

申请号：US866223

申请日：1997-05-30

申请人： Takafumi Asada ,  Hiroaki Saitoh ,  Tsutomu Hamada

发明人： Takafumi Asada ,  Hiroaki Saitoh ,  Tsutomu Hamada

IPC分类号： F16C17/02 ,  F16C33/10

CPC分类号： F16C33/107 ,  F16C17/026

摘要： A rotary shaft is inserted in a bearing bore of a sleeve with lubricant stored therebetween. Upper and lower groove patterns, spaced in a vertical direction for cooperatively generating a dynamic pressure when the rotary shaft rotates in the bearing bore, are formed on at least one of an outside surface of the rotary shaft and an inside surface of the bearing bore. The rotary shaft has a recessed portion in a region located between the upper and lower groove patterns for storing the lubricant therein. The recessed portion is asymmetrically tapered so that the lubricant stored in the recessed portion is chiefly circulated to the upper groove pattern against a gravity acting thereon when the rotary shaft rotates in the bearing bore, whereby the upper and lower groove patterns are uniformly lubricated.

摘要翻译： 旋转轴被插入到套筒的轴承孔中，其间存在润滑剂。 在旋转轴的外表面和轴承孔的内表面中的至少一个上形成有沿垂直方向隔开的用于在旋转轴在轴承孔中旋转时协同产生动态压力的上下凹槽图案。 旋转轴在位于上下凹槽图案之间的区域中具有凹部，用于在其中储存润滑剂。 凹入部分是不对称的锥形，使得当旋转轴在轴承孔中旋转时，存储在凹部中的润滑剂主要在其上作用于其上的重力主要循环到上部凹槽图案，由此上部和下部凹槽图案被均匀地润滑。