Background: The operating quality of bearings has also led to higher criteria with the growing status of the manufacturing industry in social production. The eccentricity ratio of the bearing system is particularly susceptible to change during operation as a result of the external load, which has a direct impact on the lubricating properties. On the one hand, a reasonable eccentricity ratio will improve the bearing's lubrication performance, increase stability, and better meet processing requirements; on the other hand, it will result in uncontrollable bearing behavior and may even cause the real world to deviate from the theoretical design model. Objective: The study aimed to analyze and discuss the current findings on the change in bearing eccentricity ratio. Method: More than 100 related articles have been summarized, and bearing behavior research results, such as lubrication and load-bearing characteristics, are discussed. Results: This paper discusses the progress of research on the eccentricity ratio problem of fluid-lubricated bearings, as well as the effect of eccentricity ratio change on bearing lubrication characteristics for bearings using different lubricating media. Active control measures to mitigate the negative impact of changing bearing eccentricity ratios are also presented. Conclusion: After analyzing and summarizing the relevant literature, it has been found that the eccentricity is one of the important factors affecting the lubrication characteristics of bearings.
Purpose The purpose of this paper is to analyze the variation of temperature field, pressure field and deformation of hydrostatic thrust bearing under different working conditions, so as to provide a theoretical basis for improving accuracy and reliability. Design/methodology/approach In this study, the double rectangular hydrostatic bearing of type Q1-224 was selected as the research object, and the simulation was carried out according to different working conditions, and the obtained data were summarized regularly. Findings It is found that the overall temperature of hydrostatic bearing increases with the increase of speed and load, and the increase in load will result in a larger pressure distribution which first increases and then decreases with the speed. The deformation trend of the deformation field is found, and it is found that the force deformation is larger than the thermal deformation at low rotational speed, and the thermal deformation is larger than the force deformation at high rotational speed. Originality/value In this study, the fluid-structure coupling method of conjugate heat transfer is applied to study the whole hydrostatic bearing. Most of the previous studies only studied the oil film and considered the influence of the convective heat transfer between the hydrostatic bearing and the air in heat transfer, which is rarely seen in the previous research literature.
Background: With the continuous development of the modern machinery industry, the technical level of rotating machinery is increasing. As a key component of the bearing system and power transmission system in rotating machinery, the hydrostatic bearing has higher performance requirements in all aspects. When the system is working normally, due to the shearing effect of the lubricating oil driven by the spindle rotation, a large amount of heat will be generated. The system will generate thermal effects on the bearing through heat accumulation and heat conduction. The thermal effect will directly reduce the viscosity of the hydraulic oil, affecting the bearing capacity. Seriously, it will cause thermal deformation of the parts, which will affect the normal operation of the bearing, and even cause an accident. Objective: Analysis and discussion on the thermal effect of hydrostatic bearing in recent years Method: More than 70 recently published patents were reviewed, as well as journal and conference papers on hydrostatic bearings. The results of temperature fields, pressure fields, deformation, lubrication, bearing capacity and friction were studied. Results: This review summarizes the research results from three aspects: the influencing factor of temperature rise, the influence of temperature rise on bearing structure and performance, and the effective control of temperature rise. Conclusion: The relevant research methods are analyzed. The problem of thermal effect of hydrostatic bearing is summarized and prospected, and the future development can be expected.
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