The planet carrier is one of the main components of the planetary gear transmission device, and the planetary gear shaft or bearing is installed on the planet carrier. When the planetary gear is the basic component, it is the part that bears the greatest external torque in the mechanism. The structural design and manufacture of planetary gears have a great impact on the load distribution among the planetary gears and the bearing capacity, noise and vibration of the transmission device. The reasonable structure of the planet carrier should be light weight, good rigidity, and easy to process and assemble. There are three common structural forms: double-sided plate integral type, double-sided plate separate type and single-sided plate type. The overall rigidity of the double-sided plate is good. If the structure is integrally forged, the amount of machining is large, so the casting and welding methods can be used to obtain the blank with structure and size close to the finished product. However, attention should be paid to eliminating the casting or welding defects and internal stress, otherwise the strength, processing quality and deformation of the planet carrier may be affected.
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