不同负载工况下双螺母滚珠丝杠副动态传动效率的试验研究

工程上一般采用斜面模型计算滚珠丝杠副传动效率,无法体现负载对传动效率的影响,且缺乏试验验证,因此有必要研究不同载荷下滚珠丝杠副的传动效率。从丝杠的受力分析入手,考虑接触变形,融合结构参数与实际工况,提出了传动效率计算模型。为验证传动效率计算模型的有效性,研制了丝杠副传动效率试验台,并对4010型双螺母滚珠丝杠副开展了传动效率试验。结果表明:传动效率模型计算值与试验台试验值均随着负载的增加而提高,最终趋于稳定,传动效率计算模型能够更准确的计算丝杠副在不同负载下的效率值,与目前使用的工程选型计算公式相比,更具科学性。实际工程选型设计时,可根据负载工况,使用传动效率计算模型进行效率的有效估算。

Experiment research on dynamic transmission efficiency of double nut ballscrew pair under different load conditions

In engineering, the inclined plane model is generally used to calculate the transmission efficiency of the ball screw pair, which cannot reflect the influence of load on the transmission efficiency, and there is lack of experiment verification. Therefore, it is necessary to study the transmission efficiency of the ball screw pair under different loads. Starting from the force analysis of the screw, considering the contact deformation, merging the structural parameters and the actual working conditions, proposes a transmission efficiency calculation model. In order to verify the effectiveness of the transmission efficiency calculation model, a transmission efficiency test bench for the screw pair was developed, and the transmission efficiency test of a 4010 type double-nut ball screw pair was carried out. The results show that: The calculated value of the transmission efficiency model and the measured value of the test both increase with the increase of the load, and finally tend to be stable. The transmission efficiency calculation model can more accurately calculate the efficiency value of the ball screw pair under different loads. Compared with currently used calculation formula for engineering type selection, the proposed model possesses stronger scientificalness. In actual engineering type selection design, the transmission efficiency calculation model can be used to effectively estimate the efficiency according to the load conditions.