Second, the planet gear bearings need to play an active part in torque transfer. Planetary systems split the torque insight from sunlight gear amongst the earth gears, which transfer torque to a planet carrier connected to the gearbox output. The bearings that support the planets on the carrier need to bear the entire brunt of this torque transfer.
Or, in extreme cases, they could select angular get in touch with or tapered roller bearings, both which are designed to withstand axial loads.
In planetary gearboxes, however, it’s a lot more difficult to design around these axial forces for just two related reasons. First, there is typically very little room in a planetary gearbox to incorporate the type of bulky bearings that can tolerate high axial forces.
The presence 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 amount to little more than a hassle. Gearbox designers will often upsize the bearings to accommodate the additional forces.
Since they don’t need to withstand any axial forces, spur gear bearings perform just a supporting part in the functioning of the gearbox. The bearings should just support the rotating gear shafts, but they do not play an active part in torque transfer.
Helical Gears Place Better Demand on Bearings
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