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    • 3. 发明授权
    • Bearing unit, and motor using same
    • 轴承单元和电机使用相同
    • US07029179B2
    • 2006-04-18
    • US10450851
    • 2002-10-18
    • Yuji ShishidoToshio HashimotoKiyoyuki Takada
    • Yuji ShishidoToshio HashimotoKiyoyuki Takada
    • F16C17/10
    • F16C33/107F16C17/107F16C2370/12G11B19/2009
    • A bearing unit is provided which supports a shaft (51) rotatably. It includes the shaft (51), a radial bearing (55) to support the shaft (51) circumferentially, a thrust bearing (58) to support the shaft (51) at one of thrusting-directional ends of the latter, a housing (56) having disposed therein the radial bearing (55) and thrust bearing (58) supporting together the shaft (51) and which is filled with a viscous fluid (67), and a spacer member (65) disposed inside the housing (56) to keep a gap defined between the end face of the radial bearing (55) and one side of a radial projection (54) included in the shaft (51). On the end face of the radial breading (55) opposite to one side of the radial projection (54), there is formed a first dynamic pressure producing recess (63) which produces a dynamic pressure by the viscous fluid. Also, on the side of the thrust bearing (58) opposite to the other side of the radial projection (54), there is formed a second dynamic pressure producing recess (64) which produces a dynamic pressure by the viscous fluid. As the shaft (51) rotates, the viscous fluid is circulated through the first and second dynamic pressure producing recesses (63, 64) to produce a dynamic pressure between the shaft and the radial and thrust bearings, respectively. The space member (65) provided as above permits to control the gap between the radial projection (54) and first and second dynamic pressure producing recesses (63, 64), respectively, with a high accuracy.
    • 提供了一个可旋转地支撑轴(51)的轴承单元。 它包括轴(51),用于沿周向支撑轴(51)的径向轴承(55),用于在轴的一个推力方向端支撑轴(51)的推力轴承(58),壳体 56),其中设置有径向轴承(55)和支撑在一起的轴(51)并且填充有粘性流体(67)的推力轴承(58),以及设置在壳体(56)内部的间隔件(65) 以在径向轴承(55)的端面和包括在轴(51)中的径向突起(54)的一侧之间保持间隙。 在与径向突起(54)的一侧相对的径向切口(55)的端面上形成有第一动态压力产生凹部(63),其通过粘性流体产生动态压力。 此外,在与径向突起(54)的另一侧相对的止推轴承(58)侧,形成有由粘性流体产生动态压力的第二动压产生凹部(64)。 当轴(51)旋转时,粘性流体通过第一和第二动压产生凹槽(63,64)循环,以分别在轴与径向和推力轴承之间产生动态压力。 如上所述设置的空间部件65能够高精度地分别控制径向突起54和第一动力产生凹部(63,64)之间的间隙。