封閉式靜壓軸承使用雙向節流器之靜態特性受設計因數之影響

Influence of Design Parameters on Static Characteristics of Hydrostatic Closed-type Bearing Using Double-Action Restrictors

許家銘

封閉式靜壓軸承 ； 圓柱滑桿節流器 ； 薄膜節流器 ； closed-type hydrostatic flat bearing ； cylindrical-spool ； membrane-type restrictor

中原大學機械工程研究所學位論文

2017年

碩士

康淵;張永鵬

繁體中文

本文為封閉式靜壓平面軸承使用不同節流器之研究，文中討論的雙向可變節流器包括圓柱滑桿節流器以及薄膜節流器。分析工作台承載力比對工作台位移率及軸承靜剛度之影響，探討不同節流器設計參數對於封閉式靜壓平面軸承靜態特性之影響。因此，根據工作台承載力對工作台的位移率或最大剛度可以得知各節流器最佳的設計參數及承載力的使用範圍。經分析可以知道，油墊與節流器的節流參數比改變了曲線的形狀和位置，但不影響軸承剛度趨勢的變化。而當節流器的節流係數大於10時，於較大的工作負荷處會有較大的無因次淨剛度，反之，節流係數小於10時，於較小的工作負荷處會有較大的無因次淨剛度。其中圓柱滑桿節流器較適用於大的工作負荷，而薄膜節流器較適用於小的工作負荷。

This paper investigated the design methods and optimization of the hydrodynamic thrust bearings. The thrust bearings according to the shape of oil pads have two types, which are stepped-land and tapered-land. For numerical computation, substituting known conditions and design parameters into the characteristic equations can obtain the characteristic parameters of bearings, which are the film thickness height, friction power, temperature, flow etc. In this paper, we planned the characteristic parameters calculation and optimal characteristic parameters calculation to obtain the changes in characteristic parameters of bearing corresponding to the design parameters. And we compare the optimal results for the three types of oil pads in the same conditions. The tapered-land is the best, which has high film thickness height and low friction power. It can be seen that the throttle parameter ratio of the oil pad and the restrictor changes the shape and position of the curve, but does not affect the change of bearing stiffness. And when the throttle coefficient of the choke is greater than 10, there will be a large dimensionless net stiffness at the larger working load. On the other hand, if the throttle coefficient is less than 10, there will be a smaller working load large dimensionless net stiffness. The cylindrical sliders are suitable for large working loads, while thin film throttle is more suitable for small loads.

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