Overload Protection Working Element Wear Sleeve
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing overload protection systems for agricultural equipment, such as cultivators, experience significant wear due to frictional contact between the spring assembly and the preload tube, leading to buckling and increased friction, which results in inefficient operation and reduced component lifespan.
Innovation Solution
The tubular sleeve is designed to be axially displaceable and held in contact with the upper spring plate via a compression spring, minimizing relative movement and friction between the sleeve and the spring assembly, while being made of wear-resistant plastic to reduce wear and prevent buckling, thus focusing frictional contact on the prestressing tube.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a plastic tube sleeve is inserted over the preload tube and into the spring assembly to reduce wear, then wear protection is improved, but the spring assembly bulges or buckles during compression and decompression, causing the upper spring plate to tilt and creating unfavorable frictional contact
Solution Approach 1:
The tube sleeve is divided into two functional sections: a first section that prevents buckling of the spring assembly, and a second section that reduces frictional contact through low-friction material properties. This segmentation allows each section to optimize its specific function without interfering with the other.
Solution Approach 2:
Different sections of the tube sleeve are assigned different material properties or structural characteristics. The first section has properties optimized for buckling prevention (higher stiffness), while the second section has properties optimized for friction reduction (low-friction plastic coating or material). This local differentiation resolves the contradiction by addressing each problem area with its appropriate solution.
2Reliability
If the tube sleeve is made long to cover the entire spring travel of the upper spring plate, then wear protection is improved, but the device becomes less compact and friction increases due to extended contact area
Solution Approach 1:
The tube sleeve is segmented into two functional sections with different lengths and properties. The first section covers the critical buckling zone, while the second section provides friction reduction only where needed. This segmentation allows the sleeve to be shorter than if it had to cover the entire spring travel, thus maintaining compactness while providing adequate protection.
Solution Approach 2:
Instead of providing wear protection over the entire spring travel (excessive action), the tube sleeve provides protection only in the critical areas: buckling prevention in the first section and friction reduction in the second section. This partial action approach achieves sufficient protection without the penalties of excessive length and friction.
3Stability of the object's composition
If the tube sleeve is fixed in position, then structural stability is improved, but relative movement between the spring plate and tube sleeve creates significant friction and wear
Solution Approach 1:
The tube sleeve is designed with axial displacability, transforming it from a static fixed component to a dynamic component that can move axially. This dynamic capability allows the sleeve to follow the motion of the spring plate during compression and decompression, minimizing relative movement and friction while maintaining structural stability through its constrained degrees of freedom.
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 design significantly reduces wear, allows for a more compact and low-friction overload safety device, and extends the service life of components by limiting frictional contact to the prestressing tube, enhancing the overall operational efficiency and durability.
Implementation Method 1
the tubular sleeve is held in contact with the spring plate with one end face
Implementation Method 2
the spring assembly must be pre-tensioned... generates the necessary restoring force
Implementation Method 3
made of wear-resistant plastic to reduce wear and prevent buckling, thus focusing frictional contact on the prestressing tube
Data Source
Figure 1
Figure 2
Figure 3
AI summary
Overload protection for working elements of agricultural equipment, in particular tillage implements designed as cultivators, wherein the working elements can deflect against the force of at least one spring assembly when encountering obstacles in the opposite direction of work, wherein the working elements are pivotably connected to the frame about an axis, wherein the spring assembly is connected to both the frame and the working element via pivot axes at a distance from the axis, wherein the spring assembly is pre-tensioned by means of a pre-tensioning tube and a spring plate, wherein the spring plate is arranged between the spring assembly and the overload-protected working element, and a wear protection designed as a tube sleeve is provided between the pre-tensioning tube and the spring assembly.In order to create an overload protection device for working elements of agricultural equipment that is low-friction and compact, the invention provides that the pipe sleeve is arranged axially displaceably on the preload tube, and that the pipe sleeve is held in contact with the spring plate with one end face.