Issue 131: what parameters affect the noise of the gear when the gear is meshed
Time：2019-02-13 | Source：恒宇国强 | Browse：862006
Worm gear transmission has the advantages of compact structure, large speed ratio and low noise. In many applications, the disadvantages of low transmission efficiency and high heating can be ignored.
Worm gear transmission is a common transmission form of plastic gear, such as our common egg beater, car window regulator, etc., all adopt worm gear structure.
In the case of low transmission, N and noise in NVH are usually not a problem, and V and vibration are no longer a big problem. However, h has become an inseparable topic in worm gear transmission due to the lack of N cover.
H. This may be more abstract. When we gear engineers are complained of "abnormal gear noise", it is often the H factor.
So, which factors are usually related to gear noise?
When we replace metal worm gear with plastic worm gear + plastic / metal worm, the noise will be lower, which is one of the most important factors
(1) Material stiffness
If we change the plastic worm gear from POM to POM + PTFE, the noise will also be reduced, which is another factor:
(2) Friction coefficient of material
If we change the worm with z1m1 lead angle of 5 degrees to the worm with z1m1 lead angle of 10 degrees; Usually, the noise will also be reduced. This is the third factor that plays a role
(3) Linear speed of worm
It is also said that changing the linear speed is very simple. I can reduce the speed of the worm. Yes, reducing the speed of the motor will also reduce the noise. This is the fourth factor
(4) The speed of the worm (in the case of the same worm)
Others say that if I change the worm from level 11 to level 8, the noise can also be reduced. You say a lot. This is the fifth factor:
(5) Accuracy of worm
Others will find that the noise of extruded worm is lower than that of milled worm. Yes, this is the sixth factor
(6) Surface roughness of worm
In fact, for the accuracy of the worm, what is the influence of each item of accuracy on the noise of the worm?
Compared with the test items of DIN 3974, there are the following items:
Through practice, it is found that the noise influence factors of worm gear transmission are completely different from those of ordinary parallel shaft gears. For example, for parallel shaft gears, the deviation of tooth profile has a great influence on the noise, while the influence of worm gear is very small, or even no influence.
For the worm gear, the pitch deviation of the worm has a great influence on the noise, because the pitch pair of the worm produces high-frequency periodic noise, which leads to the increase of the noise value;
For a real worm gear, the neutral of the worm and the middle section of the worm gear has a great influence on the noise, which needs special attention; For the combination of worm and helical gear, there is no such problem.
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