Second, the earth gear bearings have to play an active part in torque transfer. Planetary systems split the torque insight from the sun gear amongst the planet gears, which in turn transfer torque to a world carrier linked to the gearbox result. The bearings that support the planets on the carrier need to bear the full brunt of that torque transfer.
Or, in acute cases, they may select angular get in touch with or tapered roller bearings, both of 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 very little area in a planetary gearbox to incorporate the type of bulky bearings that may tolerate high axial forces.
The existence of axial forces makes things completely different for the bearings that support helical gears. But it is critical 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 often upsize the bearings to accommodate the additional forces.
Since they won’t need to withstand any axial forces, spur gear bearings play just a supporting part in the functioning of the gearbox. The bearings simply need to support the rotating equipment shafts, however they do not really play an active function in torque transfer.
Helical Gears Place Greater Demand on Bearings