THE DESIGN OF THE TOROIDAL PLANETARY TWO-ROW VARIATOR OF VEHICLES WITH INCREASED REQUIREMENTS FOR THE RANGE OF GEAR RATIOS AND SMOOTH RUNNING

Abstract

The article presents the design of the toroidal planetary two-row variator, variants of designs of control units of this variators and a method for calculating planetary mechanisms with inclined axes of satellites. (Research purpose) The research purpose is in developing kinematic and schematic diagrams of a two-row planetary variator; formulating and propose the methodology for calculating gear ratios, angular velocities of satellites and geometric transmission parameters; proposing variants of the variator control unit for the purpose of adaptation or unification with agricultural machinery units. (Materials and methods) The research used data from domestic and foreign authors concerning the design and theoretical description of in-line and planetary friction variators, including toroidal. Authors conducted a patent study of design options for friction planetary variators, the gear ratio of which is changed by changing the position of the satellite axes. Kinematic schemes of the proposed design options were compiled in order to develop a method for calculating gear ratios. (Results and discussion) The article presents the design that can be used in transmissions of transport and traction machines operating in the agricultural sectors. It favorably compares with analogues in small axial and overall dimensions, less wear of friction surfaces and a large range of regulation. The range of such planetary variators, designed on the basis of a combination of increasing and decreasing rows, favorably compares with the range of friction variators with toroidal rolling bodies. The article also presents the methodology for calculating gear ratios that can be used for planetary mechanisms with satellite axes that are not parallel to the main axis of the mechanism. A parametric scheme allows you not only to obtain the values of the variator gear ratios for given geometric parameters, but also to calculate these parameters automatically at the required gear ratios. (Conclusions) The developed concept of a combination of series gear ratios can be applied in the designs of planetary variators and used as a basis in further scientific developments.