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At present, the domestic road type heavy duty truck dump truck production, the basic type of truck platform provided by the modified car factory in the vehicle on the dump truck chassis derived according to user needs to design the dump operation system and modified production, realize self unloading automobile final. With the rapid development of China’s heavy truck, dump truck professional users requirements for comprehensive performance and reliability of continuous improvement, make the modification design mode of production has been unable to meet the development needs of market segments of the dump truck. Heavy dump truck chassis and is provided with integrated design is the main way to solve the problem. Cancel the auxiliary frame design of dump truck can not only realize the lightweight, but also can lower the center of gravity, improve driving stability. Therefore, has a very important significance for heavy duty dump truck integral frame design to cancel the auxiliary frame.This paper with the frame of heavy dump truck is part of integrated design and operation as the main line, through to the TY-1type with a subframe dump truck frame as the analysis object, puts forward the design point parameters, on the basis of this, to cancel the auxiliary frame, the direct part and is provided to the work to achieve special dump truck frame assembly structure design, and carries on the analysis, for the special dump truck vehicle integration design, provides the core components of the design reference.Based on the TY-1type with a sub-frame of the dump truck frame as the research object, using the finite element method, analysis its structural strength in the condition of static state, the beginning of the unloading and cargo lift to45°condition, and analysis of the free modal, stress distribution and dynamic characteristics of the frame was obtained. The experimental modal analyses have been done, obtaining first8order free modal frequency and vibration, validating the credibility of finite element model. On this basis, cancel the auxiliary frame, and redesign the integral frame. The structure of the frame longitudinal beam is I-shaped. Based on strength considerations, the front of the longitudinal beam convert into variable cross-section structure. This paper designed four kinds of longitudinal beam cross-section size, and the frame static bending stress can meet the strength requirements.Secondly, under the same conditions, analyzing the steady-state of the redesigned frame, and comparing the structure parameters of each frame. By comprehensive analysis and comparison, it was confirmed that its form is the TY-G3frame. The new frame strength is better than TY-1type, the mass is reduced by1.6%and the centre of gravity is decreased by11.18%. The finite element modal analysis results show that the first-order frequency of new frame increased, the dynamic performance is improved.Finally, optimization design is made on TY-G3frame combined with the size optimization and topology optimization methods. The frame weight is reduced0.29t, reduced by19.2%. While the frame weight is lighted, the material layout more reasonable and the strength can also be improved.
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