Analytical Evaluation of the Velocity Fluctuation of Pulse Continuously Variable Transmissions

Abstract

Pulse continuously variable transmissions allow to change gradually the speed and power characteristics of machine drives in motion and under load. When operating such transmissions, the transforming mechanism has the most complex kinematics. It transforms the rotational motion of the input link into the vibrational motion of intermediate links with different amplitudes and frequencies. The article considers the problem of analytical research of the kinematics of the transforming mechanism of a pulsed continuously variable transmission with six free-running mechanisms. To solve the problem, a calculation scheme is proposed and mathematical expressions are obtained for describing the relationship between the geometric parameters of the transforming mechanism and the speeds of the points of its links. The kinematic analysis was performed for the most compact design - a transforming mechanism based on a four-link lever. Graphs characterizing the change in the angular velocity of the output link during the forward and reverse motion of the rocker arm are given. The values of the coefficient of velocity fluctuation are found. It is shown that it is preferable to transfer the rotational motion by free-running mechanisms in the forward stroke.