The ideal installation condition of the gear on the shaft of the offset press should be that the center line of the pitch circle of the gear coincides with the center line of the shaft, and the end face of the gear is close to the shaft shoulder. However, in practice, it is often impossible to meet this requirement due to various errors, as follows:
(1) When the hole of the gear is not processed correctly or is worn into a trumpet shape due to long-term use, once it is assembled with the shaft, the gear will not fit tightly with the shaft, and the phenomenon of left and right swing will occur during operation.
(2) If the center line of the gear does not coincide with the center line of the shaft and there is an eccentricity, radial oscillation will occur during operation, so that the center distance of the meshed two gears is large and small, and changes once per revolution, so the There will be impact sound during operation. When the eccentricity is large, biting may also occur.
(3) If the gear is skewed on the shaft and there is a skew angle, the end face will oscillate during operation. When the gear teeth are meshed, the force will be concentrated on the local part of the tooth surface, and the abrasion will increase there.
(4) If the gear is not close to the shaft shoulder during installation, a part of the tooth surface will be exposed without bearing the load when the gear teeth are meshed, resulting in the incorrect axial position of the two meshed gears. This not only affects the torque transmission of the two gears, but also easily damages the gear teeth.
Familiar with and understand the adverse symptoms and consequences caused by various defects during gear installation, help maintenance personnel and operators to correctly judge and prevent equipment failures in practice.
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