Abstract A vibration mechanism with asymmetric vibrations is discussed in the article. The mechanism consists of two stages of vibration blocks with directional vibrations. The asymmetric vibrations nature is estimated by the driving force components magnitude acting in opposite directions. The article deals with the obtaining rational parameters issue of a vibration mechanism with asymmetric vibrations, using the vibration mechanism dynamic factor. The vibration mechanism dynamic factor is numerically equal to the driving force largest component magnitude ratio to the smallest acting in the opposite direction. The work solves the following problems: - obtaining the vibration mechanism dynamic factor maximum value with asymmetric oscillations at the driving force largest component given value; - the conditions determination for reaching its maximum by the dynamic coefficient; - the conditions determination for obtaining the total driving force maximum value of the vibration mechanism with asymmetric vibrations, consisting of several stages of vibrators with directional vibrations.