Bolted Vehicle Frame Solid Hollow Profiles
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Solution Overview
Problem
Conventional frames for commercial vehicles, particularly agricultural vehicles, face limitations in resilience due to internal stresses from welding and uneven temperature distribution, leading to potential damage from torsional forces, which can result in a total loss of the vehicle if not properly repaired.
Innovation Solution
A frame design featuring at least one longitudinal member with a combination of solid and hollow profile sections connected by bolts, providing high local bending strength and torsional rigidity while allowing for easy repair, with a hollow profile section overlapping solid sections to enhance anchoring and reduce thermal stresses, and using sleeves and spacers to distribute load and prevent deformation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If welded joints are used to connect traverses to longitudinal beams, then structural integrity is achieved, but resilience is limited due to internal stresses from welding and uneven temperature distribution
Solution Approach 1:
The longitudinal beams are segmented into solid profile sections and hollow profile sections, each serving different functions. The solid sections provide local bending strength at anchoring points, while the hollow sections provide torsional strength with reduced weight, avoiding the need for continuous welding along the entire beam length.
Solution Approach 2:
Different sections of the longitudinal beams have different structural qualities tailored to their specific functions. Solid profile sections are used where high local bending strength is needed for anchoring axles and tools, while hollow profile sections are used where torsional strength is needed but weight should be minimized.
2Weight of moving object
If hollow profiles with low wall thickness are used to reduce weight, then weight is reduced, but local bending strength is insufficient requiring reinforcement with U-profiles
Solution Approach 1:
The frame structure uses different profile types in different locations: solid profile sections at the front and rear for high local bending strength where axles and tools are anchored, and hollow profile sections in between for torsional strength with reduced weight. This eliminates the need for additional reinforcement U-profiles.
Solution Approach 2:
The longitudinal beams are divided into discrete solid and hollow profile sections connected by bolts. This segmentation allows each section to be optimized for its specific function without compromising overall structural integrity, avoiding the weight penalty of continuously reinforced hollow profiles.
3Strength
If solid profile sections are used throughout to ensure high local bending strength, then anchoring capacity is improved, but weight increases and torsional strength-to-weight ratio decreases
Solution Approach 1:
Solid profile sections are strategically placed only at the front and rear of the longitudinal beams where high local bending strength is required for anchoring axles and mounted tools. The intermediate sections use hollow profiles to minimize weight while maintaining sufficient torsional strength.
Solution Approach 2:
The longitudinal beams are segmented into solid profile sections for anchoring and hollow profile sections for weight reduction. These segments are connected by bolts, allowing the structure to achieve high local bending strength where needed without the penalty of using solid profiles throughout the entire length.
4Strength
If welding is used to connect frame components, then structural integrity is achieved, but repairability is reduced as damaged welds are difficult to repair properly
Solution Approach 1:
The frame components are segmented into modular sections (solid profile sections, hollow profile sections, traverses) connected by bolted joints rather than continuous welding. This segmentation allows individual damaged components to be easily removed and replaced without complex welding repairs, while maintaining structural integrity through the bolted connections.
Solution Approach 2:
Bolts serve as intermediary connection elements between frame components, replacing direct weld connections. This intermediary connection method provides structural integrity similar to welding but with the advantage of ease of assembly and disassembly for repair and replacement of damaged components.
Data Source
Figure 1
Figure 2
Figure 3
AI summary
The frame (1) has a longitudinal beam (2) which comprises a front full-profile portion (3) and a rear full-profile portion (4). A hollow profile section (5) is provided for connecting the front and rear full profile sections. The axis of the full-profile sections is attached. The full-profile sections and hollow profile section are connected by screws. The hollow profile section has two side walls formed opposite to each other, which abut on surfaces of the plate-shaped full profile sections.