Transmission assembly and speed reduction equipment

The utility model discloses a transmission assembly and speed reduction equipment. The transmission assembly comprises an eccentric shaft and a needle bearing. The eccentric shaft comprises a shaft body and an eccentric part. The eccentric part is connected with the shaft. The axis of the eccentric part is parallel to the axis of the shaft body. The needle bearing comprises an outer ring and a needle roller. The at least two roller pins are arranged around the axis of the outer ring and rotationally connected with the outer ring. And the eccentric part penetrates through the outer ring. The outer side wall of the eccentric part abuts against the outer side wall of the roller pin. The transmission assembly is configured to enable the ratio of the surface roughness of the outer side wall of the eccentric part to the surface roughness of the outer side wall of the roller pin to be within a first preset range. The first preset range can be determined through the oil film specific thickness between the eccentric part and the roller pin. The first preset range is determined according to the oil film specific thickness between the eccentric part and the needle roller, and the ratio of the surface roughness of the outer side wall of the eccentric part to the surface roughness of the outer side wall of the needle roller is within the first preset range, so that the abrasion of the needle roller bearing and the eccentric part can be reduced, and the service life of the bearing is prolonged.