Oil Film Thickness in an Elastic Connecting-Rod Bearing: Comparison Between Theory and Experiment

Abstract

Tile minim~~m oil film thickness in a dynamically loaded cone n d bearing of a high-speed, fuel injected, 2.8 litre, V-6 nec1ivt.g-ro(1, big-end bearing of a /ti$-speed gasoline engine has (60") gasoline engine; bore a n d stroke were 93 r~~m and been studied experimenlolly and tkeoretically. The theoretical cal-68.5 mm whilst was 9.2:1; c~~l r~t i o~~ were cc~rried outfir bolh rigid and elastic bearings. The the engine had a brake l o kW a t 5800 rlmin and a maximum torque o f 216 N.m at 4000 rheoly k (~Lso w~ed to explore the effects on the experimental results rlmin; the crankshaft had four main bearings. ($ (L it~echnnicnl scissor linkage and of l/te assumption that there isT h e big-end bearing shells were ungrooved, their dino rli.slorlion or cavilntioit. Coinpanions are made between the ameter a n d width being 54.0 m m a n d 16.5 m m respectively. llreory I L I I (~ ex/)e?Zment of the effects of cranksitaft speed and lu-The bearing material was copperllead on a steel backing bricc~nt visco.sily.with a ca. 10 p m thick leadltin overlay; the total thickness of the shell was 1.4 mm. Oil was fed to the bearing via a -

Effect of cylinder deactivation on the tribo-dynamics and acoustic emission of overlay big end bearings

“…Once the effective (average) lubricant temperature in the contact is found one can determine the effective viscosity of the lubricant using equation (12). Using a heat partitioning method described in [30], the temperature rise in the solid surfaces can be calculated, based on the quantity of transferred heat to them as:…”

“…The first important aspect to take into account is the dynamic nature of big end bearing response under fluctuating loads. Bates et al [12] presented an experimental investigation and a theoretical model for dynamically loaded big end bearings. They neglected the effect of any distortion or lubricant cavitation.…”

Comparison between Theoretical Calculations and Oil Film Thickness Measurements Using the Total Capacitance Method for Crankshaft Bearings in a Firing Engine

“…The coniparisons were made for several engine oils, both singlc grade (Newtonian) and multigrade (non-Newtonian) uridcr scvcr;rl load conditions for both the main and the connect- (1992,1993) have also used the TCM to measure minimum bearing oil film thickness (MBOFT) in engine bearings and to compare their results to analytical predictions obtained using analyses of various degrees of sophistication. Bates, et al, (1990) made comparisons for a connecting rod bearing. They used short bearing theory with and without elastic deformations and considered only Newtonian single grade engine oils.…”

The Effect of Cylinder De-Activation on Thermo-Friction Characteristics of the Connecting Rod Bearing in the New European Drive Cycle (NEDC)

“…The conjunctional gap shape (i.e. film thickness, h) and the variation of lubricant dynamic viscosity  are required for the solution of equation (9).…”

“…Bates et al [9] presented an experimental investigation and a theoretical model for dynamically loaded big end bearings. They neglected the effect of any distortion or lubricant cavitation.…”