Normal forces use to transfer the load makes it possible to increase load capacity and reliability of the free running mechanisms. Normal forces in the eccentric free running mechanisms are realized in engagement of the fine-module teeth that are cut on the outer cage inner surface and the outer surface of the eccentric rings. To ensure correct operation of the mechanism in jamming and wedging, value of the fine-module teeth cutting section angle should be selected from the equality condition of the radial clearance between the outer cage teeth and the eccentric ring in the entire working section. To solve the problem, calculation scheme is proposed and mathematical model is obtained that describes relationship between the fine-module cutting section angle and the mechanism geometric parameters. The nature of the main geometric parameters influence (radius, eccentricity, radial clearance, module, etc.) on the value of the teeth cutting section angle was established. It is shown that eccentricity provides the greatest influence on the working area size, radial clearance and module influences are less pronounced.
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.
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