Gear motors are characterized by high efficiency and reliability, long service life, easy maintenance, and wide application. They can be classified into single-stage, two-stage, and three-stage gear motors, and their installation and layout methods mainly include open-type, coaxial type, and split-type.
1. In an open-type two-stage cylindrical gear motor, the gears are asymmetrical relative to the support position. When the shaft undergoes bending or torsional deformation, the load is unevenly distributed across the tooth width. Therefore, the shaft should be designed with high rigidity, and the gears should be positioned far from the input or output end.
2. Characteristics of a split-type two-stage cylindrical gear motor: The extended shaft of a split-type gear motor can extend from either side, facilitating overall machine configuration. The gears in the split stage are all machined with helical teeth, one side turning right and the other left, to counteract axial forces. One shaft should be able to make slight axial movement to prevent gear jamming.
3. Characteristics of a coaxial gear motor: Compact radial dimensions, but a relatively large axial dimension. Because the intermediate shaft is large, its deflection under load is significant, resulting in severe load concentration along the tooth width. Furthermore, since the centers of the two gear stages must be aligned, the load-bearing capacity of the high-speed stage gear is difficult to fully utilize, and lubrication of the bearings located in the middle section of the geared motor is also challenging. The input and output ends of the geared motor are located at opposite ends of the same axis, which restricts the overall configuration of the transmission system.