Influences of Roller Diameter Error on the Mechanical Properties and Fatigue Life for the Main Bearing of Rotating Drum in Concrete Mixing Truck

A concrete mixing truck rotating drum's supporting main bearing (RDSMB) is usually a double row spherical roller bearing (SRB). In actual manufacturing, the roller diameter inevitably has a certain error, this error should have a great influence on the mechanical properties and fatigue life of the bearing. In this paper, the RDSMB of a certain type of concrete mixing truck is studied. The calculating equations are established to get the radial load and axial load acting on the main bearing. A mechanical model for SRB has been derived through the force analysis considering radial load, axial load, inner ring tilting angle and roller diameter error. The effects of single roller diameter error and random distribution errors of two rows of rollers on the axis orbit, roller maximum load, roller load experience and the fatigue life of RDSMB are studied. A series of influence relationship curves are obtained and analysed.