Bed wheel drive harmonic gear box, Hamenaco SHG-45-80-2UH
It is very important to select the appropriate displacement coefficient for the purpose of the gear swing or the conditions of use. This is probably the reason why the old DIN standard was abolished and the new DIN standard was formulated. Even in the British standard BS, the transposition method which considers the limit of the number of teeth in batch cutting is adopted, but this transposition method is not adopted in the new standard.
However, in this experimental result, hamenaco SHG-45-80-2UH did not report the changes of tooth profile that occurred at the same time with the tooth profile, so it is not clear whether the tooth surface is worn according to the distribution of sliding coefficient on the tooth profile curve. If the wear of two gears is reduced due to positive displacement, it is not caused by the reduction of sliding coefficient, but by the increase of the radius of curvature of the whole tooth surface and the thickness of lubricating oil film.
Sometimes it is required that the gears have the interchangeability of the hanging wheels of machine tools, and any number of gears in a gear system can be engaged. Machine tool harmonic gear box, Hamenaco SHG-45-80-2UH like Swiss standard G8) and West German standard, because the determination of the displacement coefficient of a gear is related to the displacement coefficient of the matching gear, so it can not meet the interchangeability requirements.