连杆小头衬套型线对其摩擦副润滑和变形特性的影响

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.