Cab Support Structure Box Stopper Extraction
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Solution Overview
Problem
Conventional cab support structures for construction machines are complex, leading to increased weight, welding distortion, and high material costs due to the need for reinforcement and commonization of parts, including stopper units, which are unnecessary without a roll-over protective structure (ROPS).
Innovation Solution
A cab support structure featuring a front beam, rear beam, and center beam with stopper units formed in a box structure, joined to the rear beam and outer frame at corner parts, reducing the complexity and weight of the structure, allowing for simpler welding and minimizing high-strength material usage, with stopper units only included when the cab has a roll-over protective structure (ROPS).
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If stopper units are provided on beams to commonize parts for both ROPS and non-ROPS cabs, then part commonization is achieved, but structure complexity and manufacturing cost increase
Solution Approach 1:
The stopper units are extracted from the beam structure and repositioned to the machine body frame's outer frame. This allows the beams to be simplified without stopper units for non-ROPS applications, while ROPS cabs can still have stopper units provided on the outer frame instead, achieving part commonization without beam complexity
Solution Approach 2:
The support structure is segmented into beam components and frame components with distinct functions. The beams focus solely on supporting the cab via anti-vibration mounts, while the outer frame of the machine body frame accommodates the stopper units for roll-over protection, separating the functions and simplifying each component
2Strength
If beams are reinforced to suppress local deformation at stopper unit locations, then strength is improved, but weight and material cost increase
Solution Approach 1:
The stopper units are extracted from the beam structure and relocated to the outer frame of the machine body frame. This eliminates the need for local reinforcement of the beams at stopper unit locations, reducing beam weight and material cost while maintaining the roll-over protection function through the outer frame structure
3Strength
If complex welding processes are used to assemble beams with sub-assemblies including stopper units, then structural integrity is improved, but welding distortion and manufacturing complexity increase
Solution Approach 1:
The stopper units are extracted from the beam sub-assemblies and repositioned to the outer frame structure. This simplifies the beam welding processes by eliminating the need to weld stopper units to the beams, reducing welding distortion and manufacturing complexity while maintaining structural integrity through the outer frame's stopper unit integration
Solution Approach 2:
The structure is segmented into beam assemblies and frame assemblies with distinct welding requirements. The beams have simpler welding processes for anti-vibration mount attachments, while the outer frame accommodates the stopper units, separating the complex welding requirements from the beam sub-assemblies
Data Source
AI summary
This invention relates to a cab support structure for construction machine. The cab support structure has a rear beam and a front beam, which support front and rear part of cab, and a center beam located and welded between inner and outer frames of the machine. A stopper located at the corner of center beam side of the junction of rear beam and outer frame is formed box shape. The stopper has an L-shaped plate welded to the rear beam and the outer frame, and a doubling L-shaped plate welded to the L-shaped plate, rear beam, and outer frame.