Tribo-dynamics analysis of engine small-end bearing under real temperature boundary conditions by a wireless in-situ measuring technology

Abstract

Tribo-dynamics analysis of engine small-end bearings can help to find potential schemes to avoid seizure failure that is common in today's engines under heavy loads and high temperatures. The challenge lies in determining real temperature boundary conditions due to the combined effects of frictional heat and environmental sources. This study develops a new in-situ temperature measuring and wireless transmission system, implemented in a full-scale engine under various conditions. Combining simulation and experiment provides a comprehensive understanding of the difficult-to-measure oil temperature and tribo-dynamics behavior. Results show the test bearing upper part reaches 165 °C due to piston heat transfer. Simulated high-temperature oil aggregation on the lower edges corresponds nicely to oil overheating carbonization at the same locations of the test bearing.