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节流器（以下称为SCR），以提高静压轴承的刚度。SCR利用作用在浮盘上的压力平衡，使静压轴承容易获得很高的刚度（接近无穷大的刚度）。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分析和实验研究。接下来，提出了一种新的轴承结构，应用SCR的静压径向轴承的静压径向轴承的静态特性，采用SCR的理论和实验讨论。研究结果表明：（1）推力轴承在很宽的载荷范围内具有很高的刚度（接近无穷大刚度）。（2）.获得非常高刚度的轴承间隙仅由轴承尺寸决定，不受供应压力的影响。因此，即使当供给压力变化时，所提出的轴承也可以保持非常高的刚度。（3）.该轴承在具有很高刚度的区域内具有非常快的阶跃响应，并且能够在压入载荷下稳定运行。对于滑动轴承，（1）.该轴承在很宽的载荷范围内具有很高的刚度，而与载荷方向无关。（二）、由所提出的滑动轴承支撑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，也能获得非常高的刚度。

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.