The advantage of wave gears is a possibility to obtain greater transmission ratios in one stage. The main drawback is a short life of a flexible gear due to large deformations with cyclically changing stresses. The proposed technical solution provides using a roller chain instead of the flexible gear. The gear arrangement is similar to a two-wave gear in which there is a wheel used instead of the flexible gear, with each tooth of it consisting of three rollers located in axial alignment. Middle row rollers are located along the edge of the master jaw. The outermost row rollers of the located along the lesser diameter of the jaw come into external engagement with two immobile gear wheels which have the number of the teeth equal to the number of the chain rollers. As a result, the chain does not rotate. The outermost row rollers that are located along the greater diameter of the jaw come into internal engagement with the follower wheel. At the cost of the differences of the follower wheel teeth and the chain rollers, the motion transmission occurs. The supposed transmission arrangement allows providing a transmission ratio in one stage up to 6 and higher that reduces the dimensions of the actuator.