MATHEMATICAL MODEL OF DIAGNOSTIC BEARING ASSEMBLY OF HUB OF STEERING AXLES OF WHEEL TRACTORS OF DRIVING CLASS 1,4

Abstract

The machine-tractor fleet of enterprises is an important link in the production of products of various branches of industry in Ukraine. The timely performance of transport, agricultural, road construction and other works, and ultimately the cost of products or services, largely depend on its effective work. Rolling bearings are one of the most common technical devices used in machines. They largely determine the reliability and performance of devices. The resource of the tractor chassis is mainly determined by the resource of the rolling bearings. Defects in the manufacture and operation of bearings affect the vibration signal in different ways and have different diagnostic signs. This makes it possible to identify defects at the stage of their occurrence and predict further development. In this work, the method of vibrational non-destructive testing is considered when diagnosing the bearing assemblies of the hubs of steered axles of wheeled tractors of traction class 1.4. The mathematical model developed by the authors for diagnosing the bearing units of the hubs of steered axles of traction class 1.4 wheeled tractors is aimed at determining the technical condition of the rolling bearings and allows predicting their possible service life. The developed mathematical model allows you to determine the clearances in the bearings, vibration frequencies and the average value of deformation caused by the load on the bearing depending on the frequency of rotation of the separator and the inner ring of the bearing, the initial contact angle of the rollers in the bearing, the radius of the seat of the roller, the inner diameter of the bearing, the radius of curvature of the bearing. An equation was created to determine the unbalance of the hub of the steered axles and the seating clearance of the bearings.