关键词: 商用车；底盘；上装；整改技术；车架

Abstract: Nowadays, cars are not just a means of transportation, but a comprehensive product that integrates comfort, safety, and functionality. The chassis and upper body of a car are complex systems directly related to consumers. Product quality, performance, and configuration directly affect consumers' feelings. Faced with unsatisfactory parts of the car, consumers often modify the entire vehicle according to their subjective needs during the use of the car. Therefore, the research on chassis and upper body rectification technology is of great significance. This article elaborates on the importance, principles, and precautions of chassis and upper body rectification technology, and takes the modification of the frame, the technical requirements of the subframe, and the connection between the subframe longitudinal beam and the chassis frame longitudinal beam as examples to explain the application of chassis and upper body rectification technology in cars, providing reference for car modification.

Key words: commercial vehicle; chassis; upper mounting; rectification technology; frame