Analysis and optimization of the gap elimination connection between a light chassis girder and the subframe

Abstract

In order to solve the problem of fatigue failure of the connecting bolts between the integrated subframe and the girder under the continuous high load of the chassis of a light combat vehicle, the rigid strength of the superstructure and the chassis is reduced, which affects the shooting stability. Combined with the structural characteristics of rigid connection between different materials of subframe and beam, the location and cause of bolt failure are analyzed, the " Bolt clearance connection method " is proposed, the finite element calculation model of integrated subframe and girder is established, and the mechanical characteristics of the bolt connection between the original and improved scheme are studied, and the results show that under the continuous high-intensity load of off-road surface, the method can effectively reduce the equivalent force at the bolt joint, and realize the reliable connection between the subframe and the girder in the high and low and lateral directions. Solve the rigid fixing problem of two different materials. It provides a certain reference for the optimization design of light off-road chassis stability.