This paper establishes the coupling performance evaluation model, defines a measure of the transmission performance of the coupling index-transmission error degree, establishes the finite element model according to the practical engineering model of the coupling, calculates and analyzes the axial transmission error degree and the radial transmission error degree of the coupling under different geometric parameter variables of coupling, obtains the influence rule of the geometric parameters of coupling on the transmission error degree: when the geometric parameter variables are constant, the transmission error of the coupling is constant, which can be used as an index to measure the accuracy of the angle transmission of coupling;the radial error degree of coupling is 5 to 14 times greater than the axial transmission error degree when the geometric parameter variables of the coupling are constant, so the radial error degree is an important index to measure the coupling transmission error;properly reducing the cantilever width of coupling, increasing the thickness of coupling can effectively reduce the coupling transmission error;reducing the cantilever length cannot effectively reduce the coupling transmission error.%建立了联轴器性能指标的评价模型,给出了衡量联轴器传递转角性能的指标——传递误差度,根据联轴器的实际工程模型建立了有限元模型,计算分析了联轴器在不同几何参数下的轴向传递误差度和径向传递误差度,得到了联轴器的几何参数对传递误差度的影响规律:当联轴器几何参数不变时,联轴器的传递误差度也不变,可以作为衡量联轴器转角误差的指标;当联轴器几何参数不变时,联轴器的径向传递误差度是轴向传递误差度的5~14倍,所以径向传递误差度是衡量联轴器转角误差的重要指标;适当减小联轴器悬臂的宽度,增大联轴器悬臂厚度,可有效减小联轴器的传递误差度;改变悬臂长不能有效减小联轴器的传递误差度.
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