A restrictor is one of the most important components of hydrostatic spindles and its throttling behavior has a significant effect on both stiffness and rotational precision of hydrostatic spindles. There is a shortage exhibited by the existing restrictors whose throttling characteristics cannot be controlled when hydrostatic spindles are working. A pre-pressure and pre-conditioning controllable restrictor is proposed. The operating principle of the proposed restrictor and its throttling behavior are analyzed qualitatively, and then a theoretical analysis model of hydrostatic journal bearings with a controllable restrictor is established based on fluid lubrication theory. The influences of controllable restrictor parameters including oil pressure, spring stiffness and controllable chamber pressure on the load characteristics of hydrostatic bearings are studied by using the established model. The load characteristics of the hydrostatic bearing with a controllable restrictor are compared with those of the hydrostatic bearing with a gap restrictor. It is found that the controllable restrictor can significantly improve the oil film stiffness of hydrostatic bearings under the condition that all other parameters of hydrostatic bearings are not changed. Moreover, the optimal oil film stiffness values of hydrostatic bearings are different under different eccentricities because the controllable throttle parameters are changed with a change in an eccentricity. The validity of the theoretical analysis model is verified by comparing theoretical values with experimental results.
XIONG Wanli, HU Can, LÜ Lang, ZHENG Lianggang
. Research on the Influence of Controllable Restrictor Parameters on the Characteristics of Hydrostatic Journal Bearings[J]. Journal of Mechanical Engineering, 2018
, 54(21)
: 63
-71
.
DOI: 10.3901/JME.2018.21.063
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