The numerical simulation results are shown in Table 1 and Table 2.
| Test No. | Gap/mm | Opening/(°) | Wind resistance torque of pinion/(N.m) | Wind resistance torque of wheel/(N.m) | Wind resistance power loss/W |
| 1 | — | — | 0.422 | 2.23 | 2704.3936 |
| 2 | 7 | 45 | 0.405 | 1.60 | 2164.0946 |
| 3 | 7 | 60 | 0.370 | 1.50 | 2019.4667 |
| 4 | 5 | 45 | 0.408 | 1.40 | 2010.9487 |
| 5 | 5 | 60 | 0.406 | 1.45 | 2045.8487 |
| 6 | 1 | 45 | 0.397 | 0.997 | 1665.0544 |
| 7 | 1 | 60 | 0.408 | 1.13 | 1795.3378 |
The test number in Table 2 corresponds to the test number in Table 1. The column of “clearance” in Table 1 indicates that each structural parameter of the windshield is a certain value. For example, if the clearance value in Test 2 is 7 mm, it means that each structural parameter value of the windshield used by the driven wheel in the test (that is, the big end clearance of the spiral bevel gear, the small end clearance of the spiral bevel gear, the tooth surface clearance, etc.) is 7 mm. In all tests, the windshield is installed at the driven wheel, To reduce the wind resistance power loss of the driven wheel. According to the empirical formula for calculating the wind resistance of a single gear proposed by Handschuh, it can be seen that the wind resistance loss of spiral bevel gears is proportional to the speed, diameter and tooth width, and is proportional to the fifth power of the diameter. Therefore, the wind resistance of big gears and small gears varies greatly. When the diameter of big gears is 3 times the diameter of small gears, other transmission parameters remain unchanged, and the wind resistance loss of big gears is about 12 times the wind resistance loss of small gears, Therefore, try to reduce the windage loss of driven gear to reduce the total power loss. At the same time, considering the actual manufacturing and installation, install the wind shield on the driven wheel. “Opening” refers to the angle of the notch of the wind shield at the engagement of the spiral bevel gear pair. By comparing the test data No. 1, 2, 4 and 6 or No. 1, 3, 5 and 7 in the table, it can be seen that installing a wind shield on the driven wheel can significantly reduce the wind resistance power loss of the driven wheel, and the smaller the clearance value, the more obvious the effect of the wind shield on reducing the wind resistance power loss of the driven wheel, and the wind resistance power loss of the driven wheel remains basically unchanged. By comparing the No. 4 and No. 5 tests or the No. 6 and No. 7 tests in the table, it can be seen that the smaller the mesh opening is, the smaller the wind resistance power loss of the driven wheel is, but the impact is not particularly significant.
| Test No. | Tooth surface wind resistance/W | End face wind resistance/W | Shaft surface wind resistance/W | Total wind resistance power loss/W |
| 1 Gear wheel and pinion | 1892.81 | 757.12 | 54.47 | 2704.39 |
| 2 Gear wheel and pinion | 1493.16 | 519.36 | 151.57 | 2164.09 |
| 3 Gear wheel and pinion | 1473.87 | 464.37 | 81.23 | 2019.47 |
| 4 Gear wheel and pinion | 1398.96 | 502.5 | 109.49 | 2010.95 |
| 5 Gear wheel and pinion | 1473.01 | 449.90 | 122.94 | 2045.85 |
| 6 Gear wheel and pinion | 1182.15 | 382.95 | 99.95 | 1665.05 |
| 7 Gear wheel and pinion | 1238.78 | 284.90 | 271.66 | 1795.34 |
Table 2 lists the windage power loss of spiral bevel gear tooth surface, end face and shaft surface respectively. It can be seen that the tooth surface accounts for most of the total power loss, so the gear tooth surface at high speed is an important factor affecting the windage loss.