Page 35 - Gear Technology Solutions

Hypoid gears are in general not used for these large applications. It would be con-
siderably more difficult to create a replacement pinion or gear for a hypoid design.

In face gear sets, it is easy to replace the cylindrical pinion. However, if the basic
parameters of the cylindrical pinion are known, it is also possible to design and
machine a replacement face gear.

2.3 The Procedure of Correct Replacement Gear Assembly

The wear of pinion and gear will increase the backlash in a used unit. If the
backlash in the new set is an amount of X, then before replacing a worn or
damaged member the backlash of the gearset should be measured on the
outside of the ring gear as shown in Figure 1 [1]. If it is not possible to meas-
ure backlash, due to the damage, then the backlash after replacing the dam-
aged member should be adjusted to the maximum of the defined backlash
range.

Adjusting the backlash at the time of replacing one member reduces the risk of
root interference due to the wear step (see Figure 2) and small flank form
changes on the member which is not replaced.

Figure 1: Measuring the backlash of a bevel gearset

20