The utility model provides a speed
reducer with high stability, which relates to the technical field of speed reducers and comprises a pin wheel housing, a cycloidal gear, an output shaft, an output end cover and an input shaft which are coaxially arranged, and further comprises a plurality of
planet gears and eccentric shafts, the eccentric shafts are arranged around the circumference of the input shaft in an array mode, and the eccentric shafts comprise
planet eccentric shafts and cycloidal eccentric shafts which are the same in number. The planetary eccentric shafts and the
cycloid eccentric shafts are circumferentially arranged at intervals, the number of the planetary eccentric shafts and the
cycloid eccentric shafts is 2N or 3N, and N is larger than or equal to 1 and is an integer; the
planet wheel is installed at the end of the planet eccentric shaft and meshed with the input shaft. According to the second-stage cycloidal-pin wheel
speed reduction structure, gear meshing and eccentric shaft supporting stability can be maintained when individual parts of the second-stage cycloidal-pin wheel
speed reduction structure fail,
high torque is obtained through enhancement of
torque transmission parts, and the second-stage cycloidal-pin wheel
speed reduction structure has the advantages of being high in stability, low in vibration, high in torque, long in service life and the like.