Abstract

Aims In order to solve the failure problem, the original hydrostatic oil pad was designed as a micro-inclined plane, and the dynamic pressure caused by the micro-wedge of the oil pad at a higher speed was used to compensate the static pressure loss of the bearing.

Background Heavy-duty hydrostatic bearings of the original parallel friction pair are prone to lubrication failure problems during operation

Objective For a new type q1-205 microbevel double rectangular cavity hydrostatic bearing.

Method The mathematical model of oil film theoretical analysis of hydrostatic bearing with micro-inclined surface was established, including flow equation of double rectangular cavity with micro-inclined surface and static and dynamic bearing capacity equation.

Result The oil film lubrication performance of the bearing with the wedge parameters of 0mm, 0.02mm, 0.04mm, 0.06mm, 0.08mm and 0.10mm was simulated by the finite volume method, the comprehensive influence law of the wedge-shaped parameters on the vorticity and flow rate of the oil cavity pressure fluid was revealed. Finally, the oil cavity pressure changes of oil films with different wedge parameters under certain load and speed were tested by design experiments, and the theoretical analysis and simulation were verified.

Conclusion It is found that the oil film wedge shape can well compensate the static pressure loss caused by the high-speed or heavy-duty operation of the bearing, but the dynamic pressure effect of the wedge shape does not always increase with the increase of the wedge height. The oil film exhibits superior lubrication performance in the range of 0.06mm~0.08mm.