滚珠丝杠副传动效率的模型建立及试验研究

传动效率是衡量滚珠丝杠副的传动性能的重要指标，目前传动效率的研究对接触面的摩擦润滑情况缺少深入分析，试验研究较少且多是针对某型号样件。为了得到更符合实际情况的传动效率模型并对传动效率影响因素进行分析，基于载荷分布理论，分析考虑工艺误差的滚珠丝杠副承载运动情况，再结合弹流润滑理论得到滚珠丝杠副在不同工况下的摩擦系数变化规律，从而得到新的传动效率模型，再对传动效率影响因素进行计算和分析，最终设计试验验证传动效率模型并分析不同轴向负载、转速、预紧力、润滑粘度对传动效率的影响。试验结果表明新模型的计算值与试验值的相对误差最大为6.42%,验证了新模型的有效性与合理性。

Experimental research on influencing factors of ball screw transmission efficiency

Transmission efficiency is an important index to measure the transmission performance of ball screw. The current researches on transmission efficiency lack in-depth analysis of the friction and lubrication of the contact surface. There are few experimental studies and most of them are for a certain type of sample. To obtain a transmission efficiency model that is more in line with the actual situation and analyze the influencing factors of transmission efficiency, based on the load distribution theory, the bearing and motion of the ball screw are analyzed, which consider the process error. The theory of electohydrodynamic lubrication is also combined to obtain the ball screw in different working conditions. According to the friction coefficient change rule under the conditions, a new transmission efficiency model is achieved. Then, the influence factors of transmission efficiency are calculated and analyzed. The final design test verifies the transmission efficiency model and analyzes the influence of different axial load, speed, preload, and lubrication viscosity on the transmission efficiency. The test results show that the maximum relative error between the calculated value of the new model and the test value is 6. 42% , which evaluates the validity and rationality of the new model.