| Gear pair | Maximum meshing force/N | Average meshing force/N | Maximum angular acceleration ((/°)/s2) | Average angular acceleration ((/°)/s2) |
| Standard gear | 1 565 100 | 79 500. 98 | 724 340 | 53 319. 91 |
| ISO shaping | 1 182 600 | 74 399. 73 | 542 950 | 50 644. 66 |
| EHL shaping | 1 142 700 | 62 390. 46 | 528 310 | 44 667. 29 |
The time domain curves of meshing force and angular acceleration of driven wheel of standard spur gear pair, modified spur gear pair based on ISO standard and modified spur gear pair based on elastohydrodynamic friction pair stiffness are obtained through simulation, as shown in Figure 1 to Figure 6 respectively. The maximum meshing force, average meshing force, maximum angular acceleration and average angular acceleration of three spur gear pairs are obtained from Figure 1 to Figure 6. The results are shown in the table.
From the table, it can be seen that the meshing force between unmodified spur gear pairs fluctuates greatly, and the corresponding amplitude of the meshing force time-domain graph is also large. After ISO method modification, the average meshing force of the spur gear increased from 79 to 500 98 N drops to 74 399 73 N, reduced by 6 42%, the average angular acceleration is 53 319 91 (°)/s2 drops to 50 644 66 (°)/s2, reduced by 5 02%； After modifying the stiffness of the elastohydrodynamic friction pair, the average meshing force further decreased to 62 390 46 N, a decrease of 21 52%, the average angular acceleration decreases to 44 667 29 (°)/s2, a decrease of 16 23%。
It can be seen that compared to the ISO method, the modification based on the stiffness of the elastohydrodynamic friction pair significantly improves the dynamic performance of spur gears.