1. The function and design requirements of the transmission shaft of the electric stacker forklift
The electric forklift transmission can withstand force torque and bending moment during operation, so it should have sufficient strength and rigidity. The stiffness of the shaft is insufficient. Under the load, the shaft will be deformed too much, which will affect the normal meshing of the gears, generate excessive noise, and reduce the service life of the gears. This is important and is different from the design of other parts.
Electric forklifts mainly consider the following issues when designing the transmission shaft: the structural shape of the shaft, the diameter and length of the shaft, the strength and rigidity of the shaft, and the type and size of the splines on the shaft. The structure of the shaft is mainly determined according to the requirements of the transmission structure arrangement, and considering the processing technology and assembly technology.
2. Structural design of transmission shaft of electric stacker forklift
The structure and shape of the shaft shall ensure that the gears, synchronizer components and bearings are installed and fixed. And it is closely related to the process requirements.
The splines of the first shaft where the synchronizer hub is installed are involute splines. The involute splines have lower precision requirements than rectangular splines for fixed connection, good positioning performance, large bearing capacity, short spline teeth, and corresponding small diameters. Increase the stiffness of the shaft. The choice of involute spline is more suitable for centering with large diameter. There is relative rotational motion between each gear of the first shaft and the shaft. Therefore, regardless of the needle bearing, bushing or direct contact between steel parts, the surface roughness of the shaft is required to be very high and should not be lower than 0.8. The surface hardness should not be lower than 58～63HRC.
The second shaft is usually integrated with the gear. In order to facilitate the assembly and disassembly of the second shaft, the bearing and the gear are connected by splines, and the diameter is determined according to the inner diameter of the bearings at both ends.
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