The issue of axial force in gearboxes
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Does the gearbox only require a thrust bearing on the low-speed shaft?
This also needs to be set according to actual requirements. Herringbone teeth inherently provide axial stability; they should be set according to the actual load-bearing requirements at the input and output ends, for reference only.
In high-speed and low-speed gear meshing drives, there are not only radial constraints but also axial constraints. So if you restrict the axial movement of one shaft, the other shaft is also restricted. But you shouldn’t assume that two axes can be constrained simultaneously; it’s not possible to do that, and it will have the opposite effect.
Is it because there is only one set of helical gears that both the driving and driven shafts in this type of gearbox structure are equipped with thrust bearings?
It mainly depends on the tooth shape of the high-speed and low-speed gears, to see whether their structures restrict each other during transmission. For example, in straight-tooth transmission, there is no axial constraint (and the gear surfaces in the straight-tooth transmission area also lack interlocking rings). On the other hand, a helical gear with only one side has axial restraint on just that side, so it requires a thrust bearing.
This is a single-screw drive with dual thrust bearings.
Agree, like it {:9001:}
The herringbone tooth has an axial thrust bearing on one shaft, while the position of the other shaft is determined by the meshing of the herringbone teeth, thereby achieving axial force balance in the herringbone tooth transmission. Single-screw gears generate axial force, and both shafts require axial thrust bearings.