关键词: 重卡车架；轻量化设计；冲击载荷；CATIA；HyperWorks；高强度钢；单层梁

Abstract: The frame is the frame of a heavy truck, which holds the engine, cab, transmission, steering, and loads. In the process of vehicle running, it not only bears the mass load of fixed parts, but also bears the impact, torsion, bending and braking loads caused by rough road surface and various complicated working conditions. The lack of frame stiffness and strength may cause serious problems such as the distortion and cracking of crossbeam and longitudinal beam, the decrease of frame reliability, the distortion of cab and the cracking of front windshield. In this paper, the solid model of the frame is built by CATIA, and the frame model is simplified by HyperWorks, the grid is divided, the stress concentration area is laid out and the boundary condition is simulated. According to the actual operating conditions of the vehicle, the stiffness and strength are analyzed, through the application of high-strength steel, high-strength ductile iron and aluminum alloy materials, its rigidity and strength can be guaranteed, at the same time, the weight can be reduced by 30% , and the transportation efficiency can be improved, lower transport costs, the frame has been place on the market in small quantities.

Key words: Heavy truck frame; Lightweight design; Impact load; CATIA; HyperWorks; Highstrength steel, Single-layer beam