Purpose. Study the dynamics and characteristics of friction using the example of translational kinematic pairs. Research methods. The theoretical aspects of friction research in translational kinematic pairs are examined in detail. The introduction of friction forces into the equations of kinematics leads to an increase in the number of unknown reaction components in kinematic pairs, while the number of equations remains unchanged. The force calculation of mechanisms taking into account friction comes down to a joint solution of kinematics equations containing friction forces as additional unknowns and relations obtained while considering the corresponding models of kinematic pairs of friction. Results. As a result, analytical dependencies were obtained for determining the speed, acceleration and reaction from the magnitude of the slider displacement, and changes in the power parameters of the piston pump due to wear of the parts of the reciprocating slider-guide pair were analyzed. Scientific novelty. The current level of technological progress requires constant improvement of product quality and productivity to make it competitive. This leads to increased requirements for the performance characteristics of moving joints in mechanisms and machines operating under extreme conditions of friction and wear. Friction forces arise in the kinematic pairs of mechanisms, and in many cases these forces significantly affect the movement of the mechanism links and must be taken into account in force calculations. The energy costs associated with overcoming harmful resistance forces are irreversible, and the reduction of irreversible energy costs is achieved by limiting friction forces. Practical value. The results of the research showed that the wear of the parts of the translational kinematic pair of the slider and the pump guides leads to an insignificant change in both the speed, and acceleration of the slider, at the same time, the maximum reaction in this kinematic pair changes more significantly.
Shevchenko et al. (Tue,) studied this question.