Space Frame Front Lower Connection Casting for Haul Trucks
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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 high-strength castings and fabrications to maintain stiffness and flexibility while ensuring proper load transfer, which is difficult to achieve with traditional nodal connections.
Innovation Solution
The design incorporates a front lower frame connection casting with a solid center boss and various angular and horizontal tube connection bosses, with beam members oriented at acute angles, providing a robust and flexible connection system that integrates stress concentrations and manufacturing benefits.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If conventional welded steel frames are used, then strength and stiffness are achieved, but weight becomes extremely heavy and manufacturing complexity increases
Solution Approach 1:
The frame is divided into discrete tubular members connected at nodes, forming a space frame structure. This segmentation allows each member to be optimized independently while achieving overall frame strength through the geometric arrangement and connectivity of members, significantly reducing material usage compared to conventional welded steel frames.
Solution Approach 2:
The patent employs composite construction by combining multiple tubular members with specific connection nodes to create a space frame structure that achieves superior strength-to-weight ratio. The composite arrangement of members in three-dimensional space provides structural rigidity and load distribution that cannot be achieved with simple single-piece construction.
2Weight of moving object
If fabricated nodal connections are used in space frames, then weight is reduced, but reliability under dynamic vehicular loads deteriorates
Solution Approach 1:
The connection node design incorporates specific geometric parameters and dimensional ratios that optimize stress distribution. The node geometry is carefully designed with curved surfaces and transition zones that change parameters smoothly to avoid stress concentrations, enabling the connection to reliably withstand dynamic vehicular loads including bending, twisting, and flexing.
Solution Approach 2:
The connection node design includes built-in stress distribution features that cushion and redistribute loads before they reach critical points. The geometric design of the node incorporates radius transitions and surface curvatures that prevent stress concentration, effectively cushioning the connection against dynamic loads from off-highway terrain.
3Stability of the object's composition
If high-strength castings and fabrications are used to maintain stiffness, then load transfer is improved, but manufacturing complexity and cost increase
Solution Approach 1:
The space frame is segmented into standardized tubular members and connection nodes that can be manufactured separately using conventional processes. This segmentation allows each component to be produced with simpler manufacturing methods while maintaining overall frame stiffness through the rigid geometric arrangement and precise connection geometry of the assembled structure.
Solution Approach 2:
The connection node geometry is designed with specific dimensional parameters and ratios that optimize stiffness and load transfer capabilities. By carefully controlling geometric parameters such as radius, thickness, and angle, the node achieves high stiffness without requiring complex high-strength materials or fabrication processes.
Data Source
AI summary
A front lower frame connection can comprise a center boss, outer and inner rearward horizontal front lower frame tube connection bosses, a rearward angular front lower frame tube connection boss, a vertical front lower frame tube connection boss, a forward angular front lower frame tube connection boss, outer and inner forward horizontal front lower frame tube connection bosses, a rearward horizontal beam, and a forward horizontal beam. The rearward horizontal beam can have an outer rearward horizontal beam member, and an inner rearward horizontal beam member. The forward horizontal beam can have an outer forward horizontal beam member, and an inner forward horizontal beam member.