Rothe Erde large-diameter bearings are in the majority of cases supplied with spur gears. A gear cut into one of the bearing rings offers the advantage that an additional driving gear wheel is not required, which helps to reduce design work and costs.

Highly stressed gear pairings require a pinion tip radius and a pinion tip relief.

Mainly provided are bearings with corrected gearing, addendum modification coefficient x = 0.5 see DIN 3994, 3995.

For gears subjected to high tooth flank stress, hardened gears have proven very satisfactory. Depending on module and ring diameter, the gear rings are subjected to spin hardening or individual tooth induction-hardening, the latter predominantly in the form of tooth contour hardening. Both methods provide improved flank load carrying capacity as well as higher tooth root strength. Flank hardening with hardness phase-out in the region of the root radii leaving the root radius unhardened will reduce the load capacity at the root. Hardened gears will require an individual calculation.

We need to know the pinion data in order to be able to check the meshing geometry.

During the installation of the large-diameter bearing and the drive pinion, adequate backlash must be assured.

The backlash is adjusted at 3 teeth marked in green and is to be at least 0.03 x module.


Backlash

After final assembly of the equipment and after tightening all of the fastening bolts, the backlash must be checked using a feeler gauge or a lead wire.