WAYS TO REDUCE THE LOADING OF GEAR TRANSMISSIONSWITH COMPLEX MOVEMENT OF ELEMENTS

The article considers issues related to the analysis of the loading of mechanical and hydromechanical transmissions (MGMT) with complex movement of links. It has been established that the main mechanism of damage to MGMT gears under conditions of increased vibration loading is multi-cycle fatigue of the material. Features of excitation of torsional and bending vibrations in highly loaded transmissions have been identified. It has been established that the fatigue strength of the rim is most critical for vibrations of the driven wheel, characterized by two, three or four nodal diameters. One of the ways to reduce the loading of gears with complex movement of elements is the profile modification of the teeth of the wheels. Correct modification of the gears optimizes the operation of the gear under load, reducing wear, heat generation, power losses, vibrations and noise. Another way to reduce the loading of gears with complex movement of elements is the use of dry friction dampers. Dry friction dampers provide a reduction in the amplitude of torsional vibrations in engines and transmissions. It is noted that for an effective reduction in the amplitude of resonant vibrations of a gear wheel, arising when the operating frequencies coincide with the natural ones, it is recommended to use ring or disc dampers. An assessment is given of the amplitude-frequency characteristic of peak stresses in the rim of a driven gear wheel with and without damping.