Improvement of the rolling supports of the main gear of the leading bridges of the «Kirovets» tractors

The design features of the driving axles of modern tractors «Kirovets» - the K-744 tractor and the K-424 tractor are analyzed. It was found that in the driving axles, double-row tapered bearings act as the main supports of the driving and driven bevel gears, which determine the stability of the arrangement of the original gear cones and the rigidity of elastic deformations. It was revealed that double-row tapered bearings operate mainly under axial loading, which contributes to the wear of the working surfaces of the bodies and raceways of the bearings, as well as the end surfaces of the outer and inner rings and parts of the main gear unit mated with the bearings. A technical solution is proposed for double-row tapered bearings, which ensures the creation in cyclic deformation zones of the contacting surfaces of bearing elements, additional devices that are performed on both raceways of the outer ring of a double-row bearing in the form of a means of unloading rolling elements from the working load. Moreover, the means for unloading the rolling elements from the working load of one raceway of the outer ring of the double-row tapered bearing is located diametrically opposite to the means for unloading the other raceway. The double-row rolling bearing improved in this way will allow the installation of double-row tapered bearings in the drive axles with a preload, which will ensure the stability of the position of the bevel gear pair and increase the rigidity of the bearing. In this case, during operation, the radial and axial loads on the rolling bearings will be evenly distributed between the rolling elements,and the temperature regime of the unit functioning will not increase due to a decrease in sliding friction in the contact of the interacting surfaces of the bearing elements.