When the herringbone gear pair with alignment error is meshed, the eccentric load on the tooth surface will have a great impact on the axial impact vibration and dynamic characteristics of the system. In order to facilitate the qualitative analysis of relevant results, the transmission is divided into three stages: starting stage, loading stage and stable speed stage. The axial displacement change curve of herringbone gear with different centering errors is shown in the figure.
It can be seen from the figure that in the initial stage, due to the initial clearance, the two gears have not contacted and collided, and the gear does not move axially under the action of load only. The axial displacement in this stage is 0. With the movement of the driving gear, the two gears have contact collision, and the centering error makes the contact forces on the left and right tooth surfaces of the herringbone gear different. The excessive collision force at the eccentric load end makes the gear move sharply to the other end, the axial displacement changes abruptly, the displacement reaches the maximum value, and rebounds after contacting the tooth surface at the other end. In the loading stage of meshing transmission, the gear has axial wide vibration. When the steady speed movement stage of the gear pair begins, the vibration amplitude decreases obviously, the axial displacement fluctuates periodically up and down, and the gear transmission tends to be stable.
The influence of different alignment errors on axial displacement is further analyzed. With the increase of alignment error, the initial clearance at one end of eccentric load becomes smaller and smaller, and the time at the initial stage becomes shorter and shorter. The maximum value of axial displacement appears in the loading stage, increases with the increase of centering error, and the time of peak value decreases. The average value of axial displacement of herringbone gear pair in the steady speed stage increases with the increase of centering error, and the size is close to the centering error value, indicating that the centering error directly affects the axial vibration of herringbone gear meshing transmission and the axial offset after the gear system is fully loaded.