Center Upper Frame Nodal Connection for Lightweight Load Transfer
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Solution Overview
Problem
Conventional space frame structures for haul trucks face challenges in dynamic applications due to loads, bending, and flexing, requiring carefully designed high-strength castings and fabrications to ensure proper load transfer and stiffness while being lightweight and durable.
Innovation Solution
The design of a center upper frame nodal connection with a top, bottom, and side surfaces configured to weldably attach to elongate support members and a center upper frame connection casting, forming a box structure with integral planes oriented at obtuse angles for enhanced stiffness and flexibility.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If conventional welded steel frames are used, then strength and durability are improved, but weight increases significantly and manufacturing complexity increases
Solution Approach 1:
The frame is divided into multiple tubular members connected at discrete nodal points, creating a space frame structure. This segmentation allows weight reduction while maintaining strength through efficient load distribution across multiple members, resolving the contradiction between strength and weight.
Solution Approach 2:
The nodal connections use composite construction combining plates, tubes, and welds to create joints that are both lightweight and high-strength. This composite approach allows optimization of each component for its specific function while achieving overall frame strength without excessive weight.
2Weight of moving object
If fabricated nodal connections are used in space frames, then weight is reduced, but reliability under dynamic loads deteriorates
Solution Approach 1:
The nodal connections incorporate curved surfaces and rounded transitions instead of sharp corners, which reduces stress concentration points. This curvature design improves reliability under dynamic loading while maintaining the lightweight space frame structure, resolving the contradiction between weight reduction and load transfer reliability.
Solution Approach 2:
The nodal connections are designed with optimized geometric parameters including thickness ratios, angle configurations, and dimensional proportions that enhance structural integrity. These parameter optimizations ensure reliable load transfer in lightweight constructions by tuning the connection geometry for maximum strength-to-weight ratio.
3Reliability
If high-strength castings and fabrications are used to ensure proper stiffness, then reliability is improved, but manufacturing complexity and cost increase
Solution Approach 1:
The frame structure is segmented into standardized nodal connections and tubular members that can be manufactured separately using conventional welding processes. This segmentation reduces manufacturing complexity compared to monolithic high-strength castings, while maintaining reliability through precise assembly and standardized connection designs.
Solution Approach 2:
The nodal connections are designed as universal joints that can accommodate multiple tubular members at various angles and orientations. This multi-functionality reduces the number of unique components needed, simplifying manufacturing and assembly while providing the necessary stiffness and flexibility for various frame configurations.
Data Source
AI summary
A center upper frame nodal connection fabrication comprising a top surface, a bottom surface opposite the top surface, two side surfaces, a front surface having a plurality of integral planes oriented at angles relative to each other, and a rear surface opposite the front surface. The top surface, the bottom surface, and the two side surfaces can be weldably attached to each other and the front and rear surfaces to form a structure of the center upper frame nodal connection fabrication. The integral planes of the front surface are configured to weldably attach to respective elongate support members of a space frame. The rear surface is configured to weldably attach to a center upper frame connection casting of the space frame.