STUDY ON PRECISION HYDROSTATIC JOURNAL BEARING WITH SELF-CONTROLLED RESTRICTOR

在这项工作中，提出了一种新型的自控式节流器(以下简称SCR)来提高静压轴承的刚度。本文首先将SCR应用于静压推力轴承，对推力轴承的静、动态特性进行了理论和实验研究。其次，提出了一种将可控硅应用于静压滑动轴承的新型轴承结构，并对采用可控硅的静压滑动轴承的静态特性进行了理论和实验研究。结果得到以下结论：(1)对于推力轴承，(1)所提出的轴承可以在很宽的外加载荷范围内具有很高的刚度(几乎无限大的刚度)。(2)获得很高刚度的轴承间隙只由轴承的尺寸决定，不受供气压力的影响。因此，即使在供气压力变化的情况下，所提出的轴承也能保持很高的刚度。(3)所提出的轴承在获得很高刚度的区域表现出非常快的阶跃响应，并且可以在压痕载荷下稳定地工作。对于径向轴承，(1)所提出的滑动轴承可以在很大范围的外加载荷范围内保持非常高的刚度，而与载荷的方向无关。所提出的滑动轴承支承的轴心在载荷范围内几乎是静止的，在该载荷范围内，即使载荷方向改变，也能获得很高的刚度。

In this work, a new type of self-controlled restrictor (called SCR below) is proposed to improve the stiffness in hydrostatic bearings. SCR makes it possible to easily get a very high stiffness (nearly infinite stiffness) in hydrostatic bearings by using the balance of pressure acting to a floating disk.First, SCR is applied to a hydrostatic thrust bearing and the static and dynamic characteristics of the thrust bearing is theoretically and experimentally investigated. Next, a new bearing structure to apply SCR to a hydrostatic journal bearing is proposed and the static characteristics of the hydrostatic journal bearing employing SCR is theoretically and experimentally discussed. As a result, the following conclusions are obtained.For the thrust bearing,(1).The proposed bearing can have a very high stiffness (nearly infinite stiffness) over a wide range of imposed load.(2).Bearing clearance in which a very high stiffness is obtained is determined only by the bearing dimensions and is not influenced by supply pressure. Therefore, the proposed bearing can maintain a very high stiffness even when the supply pressure is varied.(3).The proposed bearing shows a very rapid step response in the region where a very high stiffness is obtained and can be stably operated under the indented load.For the journal bearing,(1).The proposed journal bearing can a very high stiffness irrespective of the direction of the load over a wide range of imposed load.(2). The shaft center supported by the proposed journal bearing is almost stationary in the load range in which a very high stiffness is obtained even when the load direction is changed.