公开(公告)号：US06659647B2

公开(公告)日：2003-12-09

申请号：US10091022

申请日：2002-03-06

申请人： Atsutoshi Sugiyama ,  Hironobu Ishikawa ,  Tetsuji Yogo

发明人： Atsutoshi Sugiyama ,  Hironobu Ishikawa ,  Tetsuji Yogo

IPC分类号： F16C1702

CPC分类号： C04B35/6303 ,  C04B35/111 ,  C04B2235/3201 ,  C04B2235/3205 ,  C04B2235/3206 ,  C04B2235/3217 ,  C04B2235/3229 ,  C04B2235/3418 ,  C04B2235/5436 ,  C04B2235/72 ,  C04B2235/77 ,  C04B2235/786 ,  C04B2235/94 ,  C04B2235/96 ,  C04B2235/963 ,  F16C17/107 ,  F16C17/26 ,  F16C33/043 ,  F16C33/107 ,  F16C2370/12 ,  G02B26/121 ,  G11B19/2009 ,  H02K5/1675 ,  H02K5/1677 ,  Y10S384/902 ,  Y10S384/913

摘要： A ceramic dynamic pressure bearing, includes: a first member having an outer periphery formed with a gap forming surface causing a radial dynamic pressure, and a second member having an inner periphery defining a through hole formed with a gap forming surface causing the radial dynamic pressure. The first member is inserted into the through hole as to form a radial gap. The first member and the second member make rotation relative to each other to cause a fluid dynamic pressure at the radial gap. The first member and the second member are composed of an alumina ceramic including: an aluminum 90% to 99.5% by weight, and an oxide sintering assistant 0.5% to 10% by weight. The outer periphery has cylindricity not larger than 1.0 &mgr;m, and roundness not larger than 0.5 &mgr;m. The inner periphery has cylindricity not larger than 1.5 &mgr;m, and roundness not larger than 1.0 &mgr;m.

公开(公告)号：US06619847B1

公开(公告)日：2003-09-16

申请号：US10073146

申请日：2002-02-13

申请人： Hironobu Ishikawa ,  Tetsuji Yogo

发明人： Hironobu Ishikawa ,  Tetsuji Yogo

IPC分类号： F16C3206

CPC分类号： F16C33/043 ,  F16C17/10 ,  F16C17/107 ,  F16C17/26 ,  F16C2370/12 ,  H02K5/163 ,  H02K5/165

摘要： A ceramic dynamic-pressure bearing which is not prone to wear or a like problem associated with starting, stopping, or a like operation mode and which can realize smooth rotation. A dynamic-pressure gap 17 is formed between a first member 14 and a second member 15, which undergo relative rotation about a predetermined axis of rotation. The relative rotation of the first member 14 and the second member 15 generate fluid dynamic-pressure in the dynamic-pressure gap 17. At least a portion of one or both of the first member 14 and the second member 15 includes a polished surface (a dynamic-pressure gap definition surface) formed of alumina ceramic facing the dynamic-pressure gap 17, and the alumina ceramic, which forms the dynamic-pressure gap definition surface finished by polishing, is adjusted to have an apparent density of 3.5-3.9 g/cm3. Also disclosed is a motor, hard disk drive and polygon scanner containing the bearing.

摘要翻译： 不易磨损的陶瓷动压轴承或与起动，停止等相似的操作模式相关的问题，能够实现平稳的旋转。 在第一构件14和第二构件15之间形成动态压力间隙17，第二构件15经历相对于预定旋转轴线的相对旋转。 第一构件14和第二构件15的相对旋转在动压力间隙17中产生流体动压。第一构件14和第二构件15中的一个或两个的至少一部分包括抛光表面（a 由形成动态压力间隙17的氧化铝陶瓷形成的动态压力间隙定义表面，并且通过抛光将形成动态压力间隙定义表面的氧化铝陶瓷调整为具有3.5-3.9g / cm3。 还公开了一种包含轴承的马达，硬盘驱动器和多边形扫描仪。

公开(公告)号：US06702466B2

公开(公告)日：2004-03-09

申请号：US10123160

申请日：2002-04-17

申请人： Hironobu Ishikawa ,  Tetsuji Yogo ,  Junya Moribe

发明人： Hironobu Ishikawa ,  Tetsuji Yogo ,  Junya Moribe

IPC分类号： F16C3206

CPC分类号： H02K5/1675 ,  F16C17/026 ,  F16C17/045 ,  F16C17/107 ,  F16C33/043 ,  F16C33/107 ,  F16C2370/12 ,  F16C2370/22 ,  H02K5/1677

摘要： A ceramic dynamic-pressure bearing having dynamic-pressure grooves. At least a portion including a surface (dynamic-pressure gap definition surface) facing a dynamic-pressure gap is formed of ceramic, and dynamic-pressure grooves GV are formed, by electrolytic etching, on the ceramic dynamic-pressure gap definition surface such that, on a cross section of the groove GV taken perpendicular to the longitudinal direction of the groove GV, a curvature portion R having a radius of 3-7 &mgr;m is formed at a meeting position where a groove sidewall surface SG and a groove bottom surface BG meet. In a preferred embodiment, a large number of pores K are formed on one or more of the rotary surfaces M of the dynamic-pressure bearing formed of ceramic such that the surface porosity falls in the range of 10 to 60%.

摘要翻译： 具有动压槽的陶瓷动压轴承。 至少一部分包括面对动压力间隙的表面（动压间隙限定表面）由陶瓷形成，动压槽GV通过电解蚀刻形成在陶瓷动压间隙定义表面上，使得 在垂直于槽GV的纵向的槽GV的横截面上形成半径3-7μm的曲率部分R，其中槽侧壁面SG和槽底面BG 遇到。 在一个优选实施例中，在由陶瓷形成的动压轴承的一个或多个旋转表面M上形成大量孔K，使得表面孔隙率在10至60％的范围内。

公开(公告)号：US06619848B2

公开(公告)日：2003-09-16

申请号：US10073298

申请日：2002-02-13

申请人： Hironobu Ishikawa ,  Tetsuji Yogo ,  Takayoshi Morishita

发明人： Hironobu Ishikawa ,  Tetsuji Yogo ,  Takayoshi Morishita

IPC分类号： F16C3206

CPC分类号： F16C33/107 ,  F16C17/107 ,  F16C17/26 ,  F16C33/043

摘要： A ceramic dynamic pressure bearing comprising a first member and a second member, wherein the first member and the second member define a dynamic pressure gap therebetween, the first member and the second member relatively rotate around an axis of rotation, the relative rotation generates a fluid dynamic pressure in the dynamic pressure gap, the first member has a first surface directing to the dynamic pressure gap and the second member has a second surface directing to the dynamic pressure gap, and at least one of the first and second surfaces comprises ceramic, the ceramic comprises: a ceramic matrix that is selected from alumina ceramic, zirconia ceramic and silicon nitride ceramic; and 15 vol % to 70 vol % of an electrically-conductive inorganic compound phase based on the total amount of the ceramic, the phase is dispersed in the ceramic matrix, the phase comprises at least one compound selected from tungsten carbide, silicon carbide, conductive oxide, metallic nitride, metallic carbide, metallic boride, and metallic carbon nitride, and the metallic nitride, the metallic carbide, the metallic boride, and the metallic carbon nitride each independently comprises at least one of Hf, Mo, Ti, Zr, Nb, and Ta.

公开(公告)号：US07215508B2

公开(公告)日：2007-05-08

申请号：US10090267

申请日：2002-03-07

申请人： Hironobu Ishikawa ,  Atsutoshi Sugiyama

发明人： Hironobu Ishikawa ,  Atsutoshi Sugiyama

IPC分类号： G11B17/02

CPC分类号： F16C33/107 ,  F16C15/00 ,  F16C17/107 ,  F16C33/043 ,  F16C2370/12 ,  G11B19/2009

摘要： A ceramic dynamic-pressure bearing includes a first member 14 having a cylindrical outer surface and a second member 15 having a cylindrical reception hole formed therein. The first member 14 is inserted into the reception hole. A radial dynamic-pressure gap is formed between the inner surface of the reception hole of the second member 15 and the outer circumferential surface of the first member 14. The first member 14 and the second member 15 are formed of an alumina ceramic which contains an Al component in an amount of 90–99.5% by mass as reduced to Al2O3 and an oxide-type sintering aid component in an amount of 0.5–10% by mass as reduced to an oxide thereof. The thrust dynamic-pressure gap definition surface of the second member which faces the thrust plate has a flatness of not greater than 3 μm or the thrust dynamic-pressure gap definition surface of the thrust plate which faces the second member has a flatness of not greater than 3 μm. Also disclosed is a hard disk drive having a motor including a motor rotation output section having the ceramic dynamic-pressure bearing.

摘要翻译： 陶瓷动压轴承包括具有圆柱形外表面的第一构件14和在其中形成有圆柱形接收孔的第二构件15。 第一构件14插入到接收孔中。 在第二构件15的接收孔的内表面和第一构件14的外圆周表面之间形成径向动压力间隙。第一构件14和第二构件15由氧化铝陶瓷形成，该氧化铝陶瓷包含 Al组分的量为90〜99.5质量％，还原为Al 2 O 3 3，氧化物型烧结助剂组分的量为0.5〜10％ 质量被还原为其氧化物。 面向推力板的第二构件的推力动压力间隙限定表面具有不大于3um的平坦度或与第二构件相对的止推板的推力动压力间隙限定表面的平坦度不大 超过3个妈妈。 还公开了具有马达的硬盘驱动器，该马达包括具有陶瓷动压轴承的马达旋转输出部。