The Analysis for Influence of Connecting Rod Strength with the Change of Interference of Connecting Rod Small End Bushing

Abstract

Stress analysis was performed for certain connecting rod assembly by the finite element method, exploring the influence of connecting rod strength with the change of interference. After calculation, it was found that the stress in oil hole of connecting rod small end and bottom edge in the inner hole of connecting rod small end was large. Through the comparison of the different scheme, it got that : the change of the interference of connecting rod small end bushing had a great effect on the stress in oil hole and bottom edge. The increasing of interference made the stress of the bottom edge in the inner hole increase gradually and basically linearly; The maximum stress of oil hole decreased at first, and then increased. Without considering interference, maximum stress was 117MPa. When the interference was 0.01mm, maximum stress got the minimum value about 96MPa. After it, with the increasing of interference, maximum stress increased gradually. When the interference is relatively small, the breakout pressure plays a key role in the stress of oil hole of connecting rod small end, and when the interference is relatively large, the interference plays the leading role.