Space Frame Center Upper Connection Casting
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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 maintaining flexibility, which is difficult to achieve with traditional nodal connections.
Innovation Solution
The design of a center upper frame connection casting for off-highway rear haul trucks, featuring a solid center boss with multiple angular and vertical connection bosses for attaching frame tubes, providing a robust and flexible connection system that allows for efficient load transfer and distribution.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If conventional welded steel frames are used, then strength and load-bearing capacity are achieved, but weight increases significantly and manufacturing complexity increases
Solution Approach 1:
The frame is divided into multiple tubular members connected at nodes, creating a space frame structure. This segmentation allows the load to be distributed across multiple members and connections, achieving high strength-to-weight ratio compared to solid welded steel frames.
Solution Approach 2:
The patent uses cast iron or steel nodal connections that combine casting technology with structural design to create joints with optimized mechanical properties. These nodal connections integrate multiple connection points and load paths, providing both strength and weight efficiency.
2Weight of moving object
If fabricated nodal connections are used in space frames, then weight is reduced, but reliability and load transfer capability deteriorate under dynamic vehicular loads
Solution Approach 1:
The nodal connections are designed with specific geometric parameters and material properties optimized for dynamic load conditions. The casting process allows for controlled material grain structure and density, enhancing the reliability of the connections under varying loads while maintaining weight reduction benefits.
3Reliability
If high-strength castings and fabrications are used to ensure proper stiffness and flexibility, then load transfer is improved, but manufacturing complexity and cost increase
Solution Approach 1:
Multiple frame members and connection points are integrated into single casting operations where feasible. The nodal connections are designed as monolithic cast components that combine multiple functions (structural support, load transfer, geometric positioning) into unified parts, reducing assembly complexity while maintaining load transfer efficiency.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This solution enhances the structural integrity and durability of space frames by providing a lightweight, reliable, and efficient load transfer mechanism between the dump body and wheels, accommodating dimensional variations and component deflection, thus improving the overall performance and reliability of haul trucks.
Implementation Method 1
provide appropriate stiffness and flexibility characteristics while insuring proper load transfer from the dump body to the wheels
Implementation Method 2
the rearward mounting surface being configured to weldably attach a center upper horizontal frame connection
Data Source
AI summary
A center upper frame connection for a space frame can comprise a center boss; a rearward mounting surface facing rearward; a rearward angular center upper frame tube connection boss oriented downward and rearward; a vertical center upper frame tube connection boss oriented downward; a forward angular center upper frame tube connection boss oriented forward and downward; and a forward angular mounting surface facing forward and upward. The rearward mounting surface can fixedly attach a center upper horizontal frame connection, the rearward angular center upper frame tube connection boss can fixedly attach a first elongate support structure, the vertical center upper frame tube connection boss can fixedly attach a second elongate support structure, the forward angular center upper frame tube connection boss can fixedly attach to a third elongate support structure, and the forward angular mounting surface can fixedly attach a center upper frame nodal connection.