Assembly Of The Wave Generator To The Input Shaft; Check Before Assembly Of The Wave Generator; Final Check Of Position Of The Wave Generator; Assembly Control - Harmonic Drive HFUS-2A Series Engineering Data

5.9.4 Assembly of the Wave Generator to the Input Shaft

Before or after the assembly to the input shaft the Wave Generator is to be lubricated according to section 5.7. During the
assembly the axial mounting position indicated on the catalogue/confirmation drawing is to be considered.
When a clamping element is used please thighten the clamping element screws crosswise and in five steps up to the torque
indicated on the drawing (alternatively: manufacturer information), see also illustration 50.1. When the Wave Generator hub is
glued to the input shaft please consider section 5.8..
Illustration 50.1

5.9.5 Check before Assembly of the Wave Generator

Final check of position of the Wave Generator. For some clamping elements an axial movement may occur during tightening.
Please take account of this effect when positioning the Wave Generator on the shaft.
Check whether the Wave Generator is lubricated in accordance with section 5.7. When the gear is oil lubricated, fill in the
prescribed oil quantity.

5.9.6 Final Check of Position of the Wave Generator

When the Wave Generator is assembled into the Flexspline please consider that the parts must not be tilted during assembly.
By parallel assembly it is ensured that the teeth of Flexspline and Circular Spline mesh symmetrically.
Alternatively the assembly can be executed during slowly rotation of the input shaft (n < 10 rpm). This method eases the
assembly.

5.9.7 Assembly Control

Very rarely, an eccentric tooth mesh, called dedoidal, may occur (see illustration 38.2). The correct assembly can be checked as
follows:
• Check the running behaviour by rotating the input shaft (in case of types with input shaft). Alternatively you may rotate
the output flange. If you notice torque variations these may be caused by eccentric tooth mesh.
• Check the running behaviour and the motor current while the motor is rotating. Strong fluctuations in the motor current
and/or an excessive no-load current may be the result of an eccentric tooth mesh.
In case of a dedoidal assembly you can avoid permanent damage to the gear if the wrong installation is recognized by means
of the above mentioned inspection. The problem can be solved by disassembling the gear followed by a new assembly.
50
Design examples for Solid Wave Generator
with clamping element
1019658 11/2014