APPROACH TO THE CONSTRUCTION OF A GENERAL MECHANICAL TRANSMISSIONS THEORY

The three-link mechanisms are the basis of most mechanical transmissions designed to convert the motion parameters of the input links. The general case diagram of such mechanism is examined, in order to define the possibility of obtaining three-link mechanisms able to perform the function of motion conversion at a high enough forward stroke efficiency in traction mode, and also, to ensure the mechanism self-stopping when necessary. The values of the back and forth stroke efficiency were obtained in a general form, and verified for screw-nut transmissions and screw and worm gears. The use of the obtained dependences during the mechanical transmissions design allows to determine more accurately the conditions for their operability.