Page 40 - Gear Technology Solutions

2.6 Summary

This chapter explains of which bevel gearsets, single members can be replaced.
In order to replace single members, the following types of bevel gears qualify:

 Couplings and clutches
 Straight bevel gears
 Face gears

In the case of a single member replacement, the following criteria have to be re-
garded:

 The contact pattern has to be checked, it should be located central but
slightly towards the toe
 The backlash should be adjusted to the backlash of the before disassembly
of the damaged gearbox. If this is not possible, then the maximal backlash
of the given range for this design should be used
 In cases of severe wear steps between flank and root transition, the top-
lands of the replacement member have to be chamfered
 Face gears can be exchanged like straight bevel gears, topland chamfering
is required between center and toe if the cylindrical pinion shows a severe
wear step

In the case of straight bevel gears it was explained that a full exchangeability be-
tween straight bevel gears with a straight root line and Coniflex gears with a
curved root line is given. However, the tooth contact has to be adjusted to be away
from the tooth boundaries.

It was also shown that the root bending strength of Coniflex gears is comparable
or even slightly higher, compared to straight bevel gears with a straight root line.

2.7 Literature

[1] Stadtfeld, H.J. “Bevel & Hypoid Gears: Measuring Backlash” Gear Technology
Magazine, Randall Publications, Elk Grove Village, IL
June 2014, Pages: 48 to 50

[2] Stadtfeld, H.J. “Practical Gear Engineering - Answers to common Gear Manufac-
turing Questions” Company Publication, The Gleason Works,
Rochester, New York, 2019, ISBN 978-0-578-46376-6, Pages:
197 to 198

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