MWO - test rig for experimental evaluation of endurance limit of the dynamically loaded journal bearing bushes
MWO test stand is a machine with rotating load vector for investigating fatigue strength of plain bearing surface layer. Two model bearing 1 housed in the supports 4 are simultaneously investigated. Bearing loading is produced by rotation of a dynamically unbalanced shaft 2 with masses 3. Bearing housings are fixed to a stabilising bar 6 supported on ball joint 8 and four flexible joints 7. Bearings are fed with lubricating oil through the system of holes in the shaft. Owing to load rotation, identical variable normal stresses occur at each point of slide layer in given cross-section of the bearing bush during the loading cycle. These are pulsating compressive radial stresses and variable tangential stresses that alternate from tension to compression.
Schematic view of head unit (click sketch to enlarge):
Photo of test rig:
Photo of test head:
Measured and controlled quantities:
Examples of the research: