This paper focuses on the critical issue of lubrication performance in journal
bearing manufacturing, employing numerical simulation techniques to investigate
how manufacturing errors from processing accuracy impact lubrication behaviors.
As core components in mechanical systems—especially diesel engine crankshaft
bearings operating under complex conditions—journal bearings’ lubrication
performance directly determines equipment stability, energy efficiency, and
service life. Manufacturing deviations-induced poor lubrication can cause
increased friction, severe wear, or even failures, underscoring the research’s
practical value. The study constructs a refined numerical model based on the
Navier-Stokes equations within the Computational Fluid Dynamics (CFD) framework,
ensuring it reliably depicts fluid flow in bearing clearances. It then
systematically analyzes the lubrication responses of diesel engine crankshaft
bearings under diverse operational scenarios, varying key manufacturing-related
parameters: roundness degrees and clearance dimensions, which mimic real
production discrepancies like tool wear or machining vibration. Additionally,
the research explores shaft center trajectory variations under two extreme
operating conditions, as shaft movement reflects the lubrication film’s
loadbearing and stability capacities. Surface roundness and clearance are
identified as pivotal to journal bearing performance: they significantly alter
oil film thickness distribution—critical for avoiding metal contact—and
determine the maximum fluid pressure within bearings, a key load-bearing
indicator. Moreover, the amplitude and phase angle of roundness fluctuations
(often overlooked) exert substantial impacts on lubrication stability and
load-bearing properties, offering insights for optimizing manufacturing
processes to mitigate such adverse effects:
-Journal bearings.
-hydrodynamic lubrication.