The invention is a coaxial link rod stepless pulsating transmission, comprising case, input shaft, output shaft, gear train, overrunning clutch, eccentric wheel and a reduction ratio regulating component, where the input and output shafts are rotatablely installed on the case and on the same line, the input shaft is fixed with an eccentric wheel, the eccentricity of the eccentric wheel axially increases along one side of the case, the outer edge of the eccentric wheel is jacketed with a slide ring, the slide ring is jacketed with a link rod or at regular equiangular intervals jacketed with several link rods, the jacketing means that one end of each link rod is a circle in the plane of the link rod, and the circle is jacketed on the slide ring, the other end of each link rod is pivoted with a rocker, the other end of each rocker is fixed with the outer ring of an overrunning clutch, the inner ring of each overrunning clutch and a small gear are installed on a sleeve outside a pivot, each small gear engages with the same inner gear, and the inner gear is coaxially fixed with an output shaft. |