The consequences of poor installation of offset gears
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The ideal installation of the gear on the shaft of the offset press should be that the center line of the gear pitch circle coincides with the center line of the shaft, and the gear end face abuts the shoulder. However, in practice, this requirement is often not met due to various errors, as follows:
(1) When the hole of the gear is not processed correctly or wears into a flare shape due to long-term use, once it is assembled with the shaft, the gear and the shaft are not tightly fitted, and the phenomenon of swinging left and right occurs during operation.
(2) If the center line of the gear does not coincide with the center line of the shaft, there is an eccentricity, and a radial runout will occur during operation, so that the center distance of the meshed gears is large and small, and it changes once every revolution. There will be impact sounds during operation. When the eccentricity is large, seizure may occur.
(3) If the gear is installed on the shaft, there is a skew angle, and the end face will be oscillated during operation. When the teeth are engaged, the force is concentrated on the part of the tooth surface, which makes the wear more intensive.
(4) If the gear does not abut the shoulder when installing, when the teeth are engaged, the tooth surface will be partially exposed without load, resulting in incorrect relative position of the two meshed gears in the axial direction. This not only affects the torque transmission of the two gears, but also easily damages the gear teeth.
Familiar with and understand the bad symptoms and consequences of various defects during gear installation, help maintenance personnel and operators to correctly judge and prevent equipment failures in practice.