关键词: 纯电中巴；承载车身；冲压件；新闭环结构

Abstract: Because of the contradiction between the redundancy of the bus body safety performance reinforcement scheme and the lightweight demand of pure electric midibus body, as well as the application limitation of stamping parts in pure electric midibus, a new load-bearing midibus body structure based on upper stamping parts and bottom truss is presented in this paper. The overall structure scheme of the body is constructed, and the section and structure of the closed-loop structure where the rear pillar of the passenger door located are designed and optimized. Finally, to verify the mechanical properties of the new closed-loop structure, a square steel closed-loop structure is established, then the center of gravity and quality corresponding to the upper structure of the two closed-loop models are compared. The results show that the upper closed-loop structure composed of stamping parts can reduce the weight of the body structure and reduce the height position of the center of gravity compared with the closed-loop scheme of traditional square steel. The pure electric midibus body studied adopts a number of new closed-loop structures, which realizes the lightweight and safety performance of the body.

Key words: Pure electric midibus; Load-bearing body; Stamping parts; New closed-loop structure