One-stage planetary reduction unit and three-stage planetary reduction driver

The invention discloses a first-stage planetary speed reduction unit and a third-stage planetary speed reduction driver. The first-stage planetary speed reduction unit comprises a first-stage planet carrier assembly and a first-stage planet wheel installed in the first-stage planet carrier assembly. The first-stage planet carrier assembly comprises a first-stage rotation supporting disc, a first-stage planet wheel disc and a first-stage planet shaft arranged on the first-stage planet wheel disc. The first-stage rotary supporting disc is fixedly connected with a first-stage planet wheel disc through a connecting column, a first-stage planet wheel mounting space is formed between the first-stage rotary supporting disc and the first-stage planet wheel disc, and a first-stage planet wheel is mounted on the first-stage planet shaft in the first-stage planet wheel mounting space; and a second-stage sun gear is arranged on the first-stage planetary gear disc. The first-stage speed reduction unit is independent, then the driver is integrally assembled, the assembling efficiency is improved, and meanwhile the first-stage planetary speed reduction unit can be independently replaced and debugged; according to the planetary speed reduction driver, the primary speed reduction unit adopts an independent assembly structure, and the positions of all parts are kept relatively stable, so that abnormal sound caused by assembly error accumulation in the prior art is avoided, and a foundation is provided for stably transmitting power to the next stage.