The two rotors of a vacuum pump operate relatively synchronously through a pair of high-precision gears. The driving shaft is connected to the motor through a coupling. There are two main types of transmission structure layout: one is that the motor and gear are placed on the same side of the rotor as shown in the figure. The driven rotor is directly driven by the motor end gear, so that the torsional deformation of the active rotor shaft is small, and the gap between the two rotors will not change due to the large torsional deformation of the active shaft. Therefore, the gap between the rotors is uniform during operation. The biggest drawback of this transmission method is:
a. There are three bearings on the driving shaft, which increases the difficulty of processing and assembling the pump, and the disassembly and adjustment of the gears are also inconvenient;
b. The overall structure is uneven, and the center of gravity of the pump leans towards the side of the motor and gearbox.
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