Second, the earth gear bearings have to play an active role in torque transfer. Planetary systems split the torque input from sunlight gear amongst the planet gears, which transfer torque to a planet carrier linked to the gearbox output. The bearings that support the planets on the carrier need to bear the full brunt of this torque transfer.
Or, in extreme cases, they may select angular get in touch with or tapered roller bearings, both which are made to withstand axial loads.
In planetary gearboxes, however, it’s much more difficult to design around these axial forces for two related reasons. 1st, there is typically hardly any room in a planetary gearbox to incorporate the kind of bulky bearings that may tolerate high axial forces.
The presence of axial forces makes things very different for the bearings that support helical gears. But it is important to make a distinction between fixed-axis and planetary gearboxes. In fixed-axis gearboxes, the excess axial forces total little more than an inconvenience. Gearbox designers will most likely upsize the bearings to accommodate the additional forces.
Since they don’t need to withstand any axial forces, spur gear bearings play just a supporting role in the functioning of the gearbox. The bearings simply need to support the rotating equipment shafts, but they do not play an active function in torque transfer.
Helical Gears Place Better Demand on Bearings
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