高温自润滑滚子轴承游隙匹配设计研究

Study on Clearance Matching Design of High Temperature Self-lubricating Roller Bearing

高温自润滑滚动轴承在高温下工作,摩擦热和环境温度的变化会导致轴承游隙大小改变,进而影响轴承的工作精度。为探讨高温下轴承材料物理性质及其匹配性对轴承游隙的影响,基于热传导理论建立高温自润滑滚子轴承游隙变化计算模型,以纳米胶体TiO_(2)/金属陶瓷高温内梯度润滑层材料作为高温滚动轴承滚子材料,通过高温滚动轴承游隙测量实验验证模型的有效性,并分析摩擦热、环境温度变化及不同材料配对副对滚子轴承工作游隙的影响。研究表明:滚子轴承的工作游隙变化量随着环境温度的上升而增大;与环境温度变化引起的游隙变化值相比,摩擦热对轴承游隙值变化的影响较小;当自润滑轴承配对副为内外圈采用轴承钢材料、滚动体采用微孔陶瓷时其游隙变化较大;当自润滑轴承配对副为内外圈采用陶瓷材料、滚动体采用微孔陶瓷时其游隙变化较小。

Fiction heat and temperature change affect the precision of high-temperature self-lubricating rolling bearings at high temperatures by changing the bearing clearance.In order to investigate the influence of bearing material physical properties and matching on bearing clearance at high temperature,based on the theory of heat conduction,a high-temperature self-lubricating roller bearing clearance change calculation model was established.Nano colloidal TiO_(2)/cermet high temperature inner gradient lubrication layer material was used as high temperature rolling bearing roller material,and the effectiveness of the model was verified by the high-temperature rolling bearing clearance measurement experiment.The effects of frictional heat,environmental temperature changes and different material pairs on the working clearance of roller bearings were analyzed.Studies show that the change in the working clearance of a roller bearing increases with the rise of the ambient temperature.Compared with the change in the clearance caused by the change in the ambient temperature,the frictional heat has a smaller effect on the change in the clearance of the bearing.When the lubricating bearing pair is made of bearing steel material for the inner and outer rings,and the rolling elements are made of microporous ceramics,the clearance changes greatly.When the self-lubricating bearing pair is made of ceramic materials for the inner and outer rings and the rolling elements are made of microporous ceramics,the clearance changes smaller.