Based on the theory of elastic hydrodynamic lubrication and rough peak contact and the average flow model

a flexible multi-body dynamics model of the swinging friction pair of a connecting rod small end bushing was established

and the effect of the different profiles of the bushings

including parabolic

hyperbolic and tapered profiles

on lubrication and deformation of their swinging friction pairs was analyzed. Results show that compared with plain type bushing

the bushings with parabolic or hyperbolic profiles have better lubrication and deformation characteristics

while the bushing with a tapered profile has poor lubricity

but its deformation characteristics is better. In summary

use of hyperbolic profile with a cutting amount of 6 um can greatly improve the comprehensive characteristics of lubrication and deformation of the connecting rod small end bushings.