D-column upper end joint structure

Abstract

The invention discloses a D-column upper end joint structure which comprises a top cover, a rear beam outer board, a rear beam inner board, an Upper D-column reinforcing board, a rear surrounding outer board, an Upper D-column outer board and a rear surrounding inner board. The rear surrounding outer board is welded and fixed to the Upper D-column outer board. The cut edge of the Upper D-column reinforcing board and the cut edge of the rear surrounding inner board are arranged in a staggered mode. The Upper D-column reinforcing board is of an L shape, an arc transitional section is arranged in the middle of the Upper D-column reinforcing board, and the upper portion of the Upper D-column reinforcing board extends to one side so that an extending portion can be formed. An inward-recessed arc elbow is arranged at the top of the rear surrounding inner board. The root portion of the extending portion is welded to the arc elbow of the rear surrounding inner board. The Upper D-column reinforcing board and the rear beam outer board are detachably and fixedly connected. The Upper D-column outer board is welded and fixed to the rear beam outer board. The Upper D-column outer board, the rear beam outer board and the top cover are welded and fixed. According to the D-column upper end joint structure, the structure is simple, stress concentration is effectively reduced, the phenomenon that stress concentration is generated due to the arrangement of a notch is avoided, the part forming efficiency and the material use rate are improved, and the modality of a body in white is improved.

Description

technical field [0001] The invention relates to a joint structure, in particular to a joint structure at the upper end of a D-pillar of a vehicle body. Background technique [0002] The upper end joint of the D-pillar of the body is one of the most important joints in the body. Its structure directly affects the size of the first-order mode of the body-in-white, especially the MPV body. The tailgate frame is a weak area with insufficient strength / rigidity and easy to crack. Therefore, the quality of the joint at the upper end of the D-pillar can affect the quality of the entire body-in-white. D-pillar upper joint includes parts, rear side wall outer panel 3, rear side wall inner panel, D-pillar upper outer panel 6, D-pillar upper reinforcement plate, roof rear beam outer panel 2, roof rear beam inner panel, roof cover, etc., the D-pillar upper end joint area contains many parts, and the structure is more complicated. The traditional D-pillar upper end joint structure is as...

AI Technical Summary

Problems solved by technology

The main defects are: 1. The cut edge of the inner panel of the rear side wall is flush with the cut edge of the reinforcement plate on the D-pillar, and the stress is concentrated; 16 places of stress concentration; 3. The top of the inner panel of the rear side panel has a large drawing depth, the forming process of the parts is poor, and the material utilization rate is low; 4. The welding process is not good, the outer panel of the rear beam of the top cover is 2 and the upper outer panel of the D-pillar is 6 Can arrange 3 welding points 15, the welding is not firm, easy to crack

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