Hydroformed Cab Frame for Mobile Machine ROPS
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Solution Overview
Problem
The construction of cab frames for mobile machines with integrated rollover protective structures (ROPS) is labor-intensive and expensive due to the need for numerous welded hollow metal tubes and gussets, which also obstruct access for electrical harnesses and ducting.
Innovation Solution
A cab frame design utilizing hydroformed primary and secondary tubes with varying cross-sectional dimensions and orientations, connected to form a robust yet simplified structure that reduces the number of components and manufacturing steps, allowing for easier assembly and improved access for electrical and ducting systems.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If numerous hollow metal tubes and gussets are welded together to construct the cab frame, then the strength and rollover protection are improved, but the manufacturing time and labor intensity increase
Solution Approach 1:
The patent merges multiple separate hollow metal tubes and gussets into a single integrated cab frame structure. The frame is constructed as one piece with varying wall thicknesses, eliminating the need for numerous weld joints between separate components. This integration maintains structural strength while dramatically reducing manufacturing time and labor requirements.
Solution Approach 2:
The cab frame employs varying wall thicknesses at different locations to provide localized strength where needed. Thicker walls are positioned at critical areas for rollover protection, while thinner sections reduce material usage and manufacturing complexity. This local quality approach maintains necessary strength without requiring uniform thickening throughout the entire structure.
2Strength
If gussets are used to strengthen the weld joints between tubes, then the structural strength is improved, but the access for electrical harnesses and ducting is blocked
Solution Approach 1:
By integrating the frame structure as a single piece rather than assembling multiple tubes with gussets, the patent eliminates the gussets that would otherwise block access. The integrated design provides the necessary structural strength without creating obstructions in corner areas, allowing unimpeded access for electrical harnesses and ducting installations.
3Manufacturing precision
If dozens of separately sized tubes are welded to produce the cab frame, then the dimensional and strength requirements are met, but the manufacturing complexity and cost increase
Solution Approach 1:
The patent combines dozens of separately sized tubes into a single integrated cab frame component. This eliminates the complexity of sourcing, handling, and assembling multiple different tube sizes and shapes. The integrated structure maintains precise dimensional characteristics while dramatically simplifying the manufacturing process and reducing overall complexity.
Solution Approach 2:
Instead of using multiple standardized tube components, the integrated frame employs varying wall thicknesses within a single continuous structure. This local variation in thickness allows precise meeting of dimensional requirements at specific locations without requiring assembly of multiple discrete components, thereby reducing manufacturing complexity.
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
The hydroformed tube design reduces complexity and manufacturing time, lowers production costs, and maintains the necessary strength for rollover protection while providing unobstructed access for essential components.
Implementation Method 1
The primary tube is formed by hydroforming
Data Source
AI summary
A frame for a cab of a mobile machine includes a primary tube, formed by hydroforming, connected to a secondary tube. The primary tube includes first and second about vertically extending portions and an about horizontally extending portion. The about vertically extending portions are configured to be connected to the mobile machine, and the about horizontally extending portion is disposed between the about vertically extending portions. Dimensions of a cross-section of the primary tube vary along a length of a portion of the primary tube. A secondary tube is connected to the primary tube to another cab frame portion.