Comparative Studies of Connecting Rod Bearings Design on Capability to Discharge Foreign Particles 2010-01-0319
Foreign particles remaining in an engine cause bearing trouble on rare occasions.
It is required to promptly and effectively discharge foreign particles from the
bearing clearance space to improve reliability of the engine. In this paper, the
bearing configuration of at the parting line between upper and lower bearings
which are capable of discharging foreign particles are experimentally studied.
Tests were conducted for fundamental visualization of oil flow and particles. As
a result, the behavior of the particles in the bearing clearance space and the
effects of the bearing configurations were well demonstrated. In the bench test
using an actual engine, the bearing configuration with grooves at the parting
line of the bearing demonstrated the effectiveness to prevent bearing damage
caused by foreign particles. The influence of the bearing configurations on oil
flow rate was confirmed not to increase the flow rate.