Investigation of the driven disks of hydromechanical transmission BELAZ with the new LZ_G-Base oil and the friction materials FM-15 and MK-5

At the mining dump trucks BELAZ with lifting capacity from 30 to 90 tons, loaders and bulldozers, special vehicles BELAZ for metallurgical production (slag trucks, heavy vehicles), aerodrome tractors, as well as for dump trucks and vehicles for underground works of the brand “MoAZ” are used hydromechanical transmissions OJSC “BELAZ” is the managing company of the holding “BELAZ-HOLDING”. The most important element of the hydromechanical transmission, which limits its service life and reliability, are the friction clutches for switching the stages and blocking the hydraulic transformer. The disks of friction clutches sustain significant static and dynamic loads, their surfaces are exposed to high specific thermal energy and intensive wear. During the tests it was established that for the sintered powdered friction material based on copper MK-5 (commercially used in the hydromechanical gearbox) it’s possible to increase the friction coefficient, decrease the stopping time and the wear rate by using the transmission oil LZ_G-Base. The sintered powdered friction material FM-15 has initially increased tribotechnical properties in comparison with material MK-5. The investigations of tribotechnical properties of sintered powder materials is currently being given to much attention. However, these studies do not consider the influence of lubricants on the operation of the sintered powder friction materials. The application of oil of type (LZ_G-Base) which is developed on Lubrizol technologies and G-Base base oils during operation of the sintered friction material FM-15 increases its tribotechnical properties by 10…15%. The conducted investigations of the driven discs for the hydromechanical transmissions BELAZ with the new gear oil LZ_G-Base and the friction materials FM-15 and MK-5 have showed that the tribotechnical characteristics are increased and the wear rate of the discs is decreased.

hydromechanical transmission, friction disk, counterface, sintered powder friction material, oils, lubricant, friction coefficient, wear rate, acoustic characteristics of the friction material, friction torque