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    • 1. 发明授权
    • Pivotable arm assembly with reduced thermal distortion
    • 可转动臂组件,具有降低的热变形
    • US5251085A
    • 1993-10-05
    • US731548
    • 1991-07-17
    • Frank I. MorrisKing L. WongRobert L. Talbot
    • Frank I. MorrisKing L. WongRobert L. Talbot
    • G11B5/55
    • G11B5/5565
    • A pivoting armset assembly is disclosed herein that has substantially reduced misregistration due to thermal effects. The armset assembly is useful for an actuator in a magnetic disk drive; the preferred embodiment is an armset assembly in an actuator for reading from, or writing to, one or more magnetic storage disks. The armset assembly, constructed according to the present invention, includes an armset having a smooth bore aligned with the axis of rotation. The assembly further includes a sleeve having a smooth outer perimeter with a size for an interference fit within the smooth bore. An anti-friction material is positioned between the smooth sleeve and the smooth bore. The assembly also includes a bearing disposed within the sleeve, to pivot the arm about its axis. The coefficient of friction between the bore and sleeve is high enough that they rotate together as a unit throughout their operating temperature range, without creating radial clearance between the arm and the sleeve, but low enough to permit slight axial adjustments during thermal expansion in which the bore expands at a different rate than the sleeve. Preferably, the anti-friction material is disposed on the sleeve, and includes a coating of tungsten disulfide (WS.sub. 2). The coefficient of friction can be selected by a choice of the heaviness of the interference fit, the type of the anti-friction material, and the smoothness of the bore and the sleeve.
    • 本文公开了一种旋转臂组件,其由于热效应而基本上减少了对准。 臂组件对于磁盘驱动器中的致动器是有用的; 优选实施例是用于从一个或多个磁存储盘读取或写入一个或多个磁存储盘的致动器中的臂组件。 根据本发明构造的臂组件包括具有与旋转轴线对准的平滑孔的臂组。 组件还包括具有光滑外周的套筒,其具有用于在光滑孔内的过盈配合的尺寸。 抗磨材料位于光滑套筒和光滑孔之间。 组件还包括设置在套筒内的轴承,以绕其轴线枢转臂。 孔和套筒之间的摩擦系数足够高,使得它们在其工作温度范围内作为一个单元一起旋转,而不会在臂和套筒之间产生径向间隙,但足够低以允许在热膨胀期间进行轻微的轴向调节,其中 孔以与套筒不同的速率膨胀。 优选地,抗摩擦材料设置在套筒上,并且包括二硫化钨涂层(WS 2)。 可以通过选择过盈配合的重度,抗摩擦材料的类型以及孔和套筒的平滑度来选择摩擦系数。