H-Shaped Telescopic Frame for Seed Drill Stability
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Solution Overview
Problem
Precision seed drills with telescopic frames suffer from high sliding friction, increased wear, and instability due to torsional forces, especially when using square tube sections which are prone to deformation under force.
Innovation Solution
The telescopic frame features an outer tube section with an H-shaped cross-sectional profile and wedge-shaped projections, providing a form-fitting guidance for the inner tube section, which reduces wear and ensures stability by distributing forces effectively through a high moment of inertia and maximized contact surfaces.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If square tube sections are used in the telescopic frame, then the structure is simple and easy to manufacture, but the frame becomes prone to deformation under torsional forces and exhibits high sliding friction
Solution Approach 1:
The patent changes the cross-sectional geometry parameter of the tube sections from square to H-shaped profile. This parameter change increases the area moment of inertia, making the frame resistant to deformation under torsional forces while maintaining manufacturing feasibility through standard rolling or welding processes.
Solution Approach 2:
The patent employs a composite structural design where H-shaped tube sections are used in combination with specific sliding element configurations. The H-shaped profile acts as a composite structural solution that combines high stability with acceptable manufacturing complexity, resolving the contradiction between ease of manufacture and frame stability.
2Ease of operation
If sliding elements bear against the inside of square tube sections, then the telescoping function is achieved, but high sliding friction and increased wear occur due to torsional forces
Solution Approach 1:
The patent changes the contact surface geometry by using H-shaped tube sections with optimized flange configurations. This creates more favorable bearing surfaces for sliding elements, distributing contact forces more evenly and reducing both sliding friction and wear, thereby extending service life while maintaining telescoping functionality.
3Stability of the object's composition
If the outer tube section has an H-shaped cross-sectional profile, then the frame stability and resistance to deformation increase, but the device complexity increases
Solution Approach 1:
The patent applies parameter change by adopting the H-shaped cross-sectional profile, which optimizes the area moment of inertia to provide high stability. While this increases structural complexity compared to simple round or square tubes, the H-profile remains a standard structural form that balances performance and complexity.
4Reliability
If the inner tube section is guided in a form-fitting manner within the outer tube section, then reliable telescoping and prevention of uneven loading is achieved, but the manufacturing precision requirements increase
Solution Approach 1:
The patent changes the geometric parameters of the H-shaped profile, particularly the flange dimensions and web thickness, to create inherent guidance features. The form-fitting guidance is achieved through optimized dimensional parameters rather than complex mechanical guides, reducing manufacturing precision requirements while maintaining telescoping reliability.
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 configuration enhances the longevity of the seed drill by minimizing wear, ensuring reliable telescoping, and maintaining stability even under torsional and bending forces, while reducing sliding friction and deformation susceptibility.
Implementation Method 1
This leads, to a disadvantageous effect, not only to high sliding friction and significantly increased wear of the sliding elements
Implementation Method 2
The sliding elements bear against the inner sides of the wedge-shaped projections of the at least approximately H-shaped cross-sectional profile of the outer pipe section
Implementation Method 3
an H-shaped cross-sectional profile, due to its high area moment of inertia, is particularly stable and resistant to deformation
Implementation Method 4
A torque acting on the inner tube section causes torsion between the inner and outer tube sections
Data Source
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AI summary
Multi-row single-seed seed drill with a frame comprising at least one frame element arranged transversely to the direction of travel and telescopically variable in length, wherein several working tools, for example designed as seeding units, are assigned to the at least one frame element, and the at least one frame element comprises an outer pipe section and at least one inner pipe section, wherein the at least one inner pipe section is slidably mounted within the outer pipe section.In order to create a telescopic frame which has high stability and is insensitive to torsional forces, it is provided that at least the outer tube section has an at least approximately H-shaped cross-sectional profile, wherein the projections of the H-shaped cross-sectional profile are designed as wedge-shaped grooves, and the at least one inner tube section is guided in a form-fitting manner within the outer tube section by means of sliding elements, wherein the sliding elements bear against the inner sides of the wedge-shaped projections of the at least approximately H-shaped cross-sectional profile of the outer tube section.