| Generally, there are installation errors existing between two shafts which are connected by the flexible coupling. These errors can be divided into two parts:the radial installation error and the deflection installation error according to the misalignment between axes of the shafts. The installation errors can lead to the circumferential angle, which is called the rotation angle error of the coupling. The flexible coupling, applied to sophisticated transmission, should be able to reduce the rotation angle error caused by the installation errors from the principle and the structure of couplings. So how to reduce the rotation angle error of the coupling is an important subject.Firstly, the evaluation model for the performance of the coupling is established to define the performance index about the rotation angle error caused by coupling compensating the installation errors—angular stiffness. Secondly, the coupling finite element model is built according to the actual engineering model of coupling to research the angular stiffness of the coupling and calculate the rotation angle error of the coupling caused by the radial installation error and the deflection installation error. The results show that there is a linear relationship between installation error and the rotation angle error. When the installation error increases, the corresponding rotation angle error increases. For the radial error and the deflection error, the rotation angle error and stiffness is a periodic variation depending on the angular position; When the installation error angle changes in a circle, angular stiffness take the minimum value in 45° and 135°,225° and 225°, and take the maximum value at 0°,90°,180° and 270°. Comparing the smallest value of the radical angular stiffness and the deflection angular stiffness, the former angular stiffness is smaller. Therefore, the radial installation error had the greater influence on the performance of the coupling. The rotation angle error is approximated superposition when the two installation errors exist at the same time. Thirdly, the sensitivity property between the geometrical parameter variables of coupling and angular stiffness is researched further and the following rules are found:The radical angular stiffness and the deflection angular stiffness increase with the decrease of the cantilever width; Both of the angular stiffness increases gradually with the increase of the cantilever thickness; With the increase of the cantilever length, both of the angular stiffness increases gradually. All three kinds of sensitivity results can shows that the angular stiffness can effectively increase by appropriately decreasing the cantilever width of coupling, decreasing the cantilever thickness of coupling and increasing the cantilever length of the coupling.Finally, according to the actual engineering model of coupling, a performance test device is designed for the coupling. Then, the rotation angle error of the flexible coupling is tested through experiments and the test results are compared with theoretical calculation results, which verify the correctness of the calculation method. |
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