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Adjusting the Spiral Bevel Pinion Shaft
After pre-tightening the tapered roller bearing of the spiral bevel pinion shaft, the measured total friction
torque of the spiral pinion shaft should be 1.0-1.5mm (see Fig. 6).
Adjusting the Pair of Spiral Bevel Gears
Begin adjusting the pair of spiral bevel gears after 1-2 minutes of testing in positive and negative directions,
running when there is no oil in the gearbox case. The backlash between two spiral bevel gears should be 0.15-
0.25mm. The ideal imprint is shown in Fig. 7 and Table 1. The imprint of the spiral bevel gears
’ pinion should
be higher than that of the spiral bevel gear. With a light load, the length of the imprint should be about half of
the total length of the gear tooth. While shifting to the larger end of the gears with a full load, the imprint of the
gears should approach the small end while installing inspection. The adjustment of a pair spiral bevel gears
under various conditions are shown below.
Imprints
Adjusting Method
Gears Directions
Pinion
Bevel Gear
Normal imprint (ideal imprint).
Move the bevel gear off the pinion.
If the backlash is too big, move
pinion inward.
Move the bevel gear close to the
pinion. If the backlash is too small,
move the pinion outward.
Move the pinion close to the bevel
gear. If the backlash is too small,
move the bevel gear outward.
Move the pinion off the bevel gear.
If the backlash is too big, move the
bevel gear inward.
Table 1: Adjusting Imprints and Backlash of Spiral Bevel Gear
Summary of Contents for 40XTD
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