Figure 1 shows the comparison of the center motion track of the driving and driven gears of the front and rear gear pair 5 of the coupling rocker box, and the number of gears and gear pairs is shown in Figure 2. Figure 1 (a) is the trajectory diagram in the horizontal plane: the driving and driven gears in front of the coupling rocker box are in their theoretical positions, because there is no axial (Z-direction) force in the spur gear transmission; the driving and driven gears in the rear of the coupling rocker box move to the coal wall due to the deformation of the rocker box.
Figure 1 (b) is the trajectory diagram in the plumb plane: the front driving and driven gears of the coupling rocker box are respectively located above and below their theoretical positions, which is due to the opposite direction of the meshing force acting on the two gears; the rear driving and driven gears of the coupling rocker box are all located above their theoretical positions, which is caused by the implicated movement of the rocker box deformation, and the implicated displacement of the driven gear (G7) is greater than that of the driving gear Wheel (G6), reflecting the characteristics of cantilever beam.
Figure 1 shows that the fixed shaft gear is affected by the deformation of the rocker box, and the whole involved motion occurs. At the same time, the above analysis shows that the calculation results in Figure 1 are in line with the common sense, which indirectly verifies the correctness of the coupling model.