This paper is based on the new Q1-205 micro-beveled double rectangular cavity heavy hydrostatic thrust bearing. According to the hydrostatic and dynamic pressure lubrication theory, the mathematical model of the dynamic and static bearing capacity of micro-beveled oil film is established under the conditions of considering the bearing oil supply system and the actual structural of the oil pad. Based on the finite volume method, the lubricating performance of the oil film is numerically simulated under heavy load of 10t, 15t, 20t, 25t and 30t, and the comprehensive influence law of oil cavity pressure, fluid velocity, vorticity and flow rate is revealed under the influence of extreme working conditions such as heavy load. Finally, the oil film pressure field affected by heavy load is tested under certain wedge parameters and rotational speed and verifies the theoretical analysis and simulation. It is found that the experimental and theoretical result of bearing is consistent with each other under heavy load. The dynamic pressure compensation effect of the bearing is better under the wedge oil pad condition. However, under heavy load, the extrusion and heating of lubricating oil are serious, which make the viscosity of lubricating oil drops sharply. In addition, the dynamic pressure effect of wedge oil pad is less affected by load. The compensation effect decreases slightly with the increase of load. The dynamic pressure compensation range of the bearing is 30%–10% under heavy load.
Purpose
To solve the problem of oil film thinning when hydrostatic thrust bearings are overloaded or rotating at high speed, the dynamic pressure formed by tiny oil wedges is used to compensate, and the optimum height of oil wedges is determined by the compensation rate to improve the bearing capacity of hydrostatic thrust bearings.
Design/methodology/approach
This research method is aimed at the new type of double rectangular cavity static bearing with microbevel surface of q1-205. The wedge parameters of oil film were defined. The oil film lubrication performance of the bearing with the wedge parameters of 0, 0.02, 0.04, 0.06, 0.08 and 0.10 mm 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.
Findings
This study 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 0.06–0.08 mm.
Originality/value
The original hydrostatic oil pad was designed as a microinclined plane, and the dynamic pressure caused by the microwedge of the oil pad was used to compensate the static pressure loss of the bearing. The lubrication performance of the oil film under the condition of varying viscosity was obtained by using the simulation method.
Purpose
When the clearance oil film of hydrostatic bearing friction pair is in critical lubrication state, the phenomenon of zero flow of local lubricating oil will aggravate the oil film temperature rise, which needs to be solved.
Design/methodology/approach
In this paper, the critical lubrication parameter equation and the oil film temperature rise mathematical model are derived for the new type q1-205 double rectangular cavity hydrostatic bearing. Based on a combination of theoretical analysis, simulation and experimental verification, this paper analyzes the flow characteristics and temperature rise characteristics of the lubricating oil when the hydrostatic bearing is in a critical lubrication state under different operating conditions and finally obtains the critical lubrication state of the oil film.
Findings
This study found that the numerical simulations and the derived formulas agree with the results. When the oil film is in critical lubrication, the cross-section side flow of the oil side is almost zero. The heat cannot be taken away in time, resulting in the local temperature rise of the oil film, which causes serious heat accumulation.
Originality/value
It is concluded that the operating condition parameters corresponding to the critical lubrication state provide a theoretical basis for the selection of actual hydrostatic bearing operating conditions, which is of great scientific significance.
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