Vehicle Body-Chassis Coupling Structure With Locking Pipe Welding Access
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Solution Overview
Problem
The existing coupling structure of a vehicle body and chassis frame faces challenges in achieving a flat surface for welding due to weld beads and difficulty in welding within the closed sectional shape of the side member, which affects the coupling strength and rigidity of the vehicle.
Innovation Solution
The proposed coupling structure modifies the side member and vehicle body side sill sections to create a stepped shape, allowing for increased contact area and cross-sectional area, with an adhesive section and a locking pipe that passes through a battery coupling part, enhancing the welding space and assemblability, and includes a pipe passage hole to accommodate the locking pipe and prevent lifting.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the bolt passage pipe is welded to the side member using conventional welding methods, then the coupling strength between the side member and side sill is improved, but the welding process becomes difficult due to the closed sectional shape of the side member and the presence of weld beads preventing flat surface formation
Solution Approach 1:
The side member is divided into an upper side member and a lower side member that are separately formed and then coupled together. This segmentation opens the previously closed sectional shape, providing access to the inner surface for welding the locking pipe while maintaining structural integrity through the coupling of the two segments.
Solution Approach 2:
The locking pipe is configured to extend in the widthwise direction of the vehicle rather than the conventional vertical direction. This dimensional change allows the pipe to pass through the side member in a direction that provides adequate welding space and access, resolving the difficulty of welding within the closed sectional structure.
2Stability of the object's composition
If the side member uses a closed sectional extruded shape, then the structural integrity and rigidity are maintained, but welding access to the inner part of the side member becomes difficult
Solution Approach 1:
The closed sectional side member is segmented into upper and lower parts that are formed separately and then assembled. This allows the locking pipe to be welded to the inner surface of what would otherwise be a closed section, while the coupling of the segments maintains the overall structural integrity and rigidity of the side member.
3Strength
If weld beads are present on the welding surface, then the coupling strength is achieved, but a flat surface cannot be realized which affects assembly precision
Solution Approach 1:
By changing the orientation of the locking pipe to extend in the widthwise direction, the welding surfaces are positioned such that weld beads do not interfere with the flatness requirements of the coupling interface between the side member and side sill, thereby achieving both strong coupling and precise assembly.
Data Source
AI summary
A coupling structure of a vehicle body and a chassis frame may include: a vehicle body side sill section provided to the vehicle body of a vehicle; and a side member section provided to a chassis frame coupled to the vehicle body, coupled to the vehicle body side sill section, and having a battery module mounted thereto, wherein the side member section includes a side member body part, and a battery coupling part which is integrally formed with the side member body part, wherein the vehicle body side sill section includes a side sill body part which is seated on the upper surface of the side member body part, and a locking part which is integrally formed with the side sill body part.