Wear Element Adapter Pin Placement for Low-Stress Retention
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Solution Overview
Problem
Existing wear assemblies for earth-moving machines face challenges with pins being subjected to excessive stress, wear, and deformation, leading to difficulties in disassembly and potential breakage, which can result in the loss of the wear element.
Innovation Solution
The adapter and wear element are designed with specific geometric configurations and pin placement to minimize stress on the pin by allowing for rotational sliding contact between support surfaces, reducing the need for the pin to withstand significant forces.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the pin is positioned to securely retain the wear element on the adapter, then the retention reliability is improved, but the pin is subjected to excessive stress and deformation
Solution Approach 1:
The patent changes the positional parameter of the pin opening relative to the support surfaces. Specifically, the pin opening is positioned at a distance from the support surfaces such that the pin does not bear the full load of the wear element. This parameter change allows the pin to retain the wear element while reducing stress and deformation, resolving the contradiction between retention reliability and pin stress.
2Reliability
If the pin is positioned to securely retain the wear element, then the wear element remains firmly attached, but disassembly becomes difficult due to pin deformation
Solution Approach 1:
The patent positions the pin opening at an optimized distance from the support surfaces, creating a geometric relationship where the pin engages the wear element securely during operation but experiences reduced stress. This parameter optimization ensures the wear element remains firmly attached during use while allowing easy disassembly by removing the pin without excessive force, as the pin does not undergo significant deformation.
3Reliability
If the pin opening is positioned to provide secure retention, then the wear element is reliably retained, but the pin experiences wear and potential breakage
Solution Approach 1:
The patent optimizes the position of the pin opening relative to the support surfaces by defining specific geometric relationships and distances. This parameter change ensures the pin provides reliable retention of the wear element while minimizing the stress and wear it experiences during operation, thereby preventing pin breakage and extending the service life of the assembly.
4Strength
If the support surfaces are positioned to maximize contact area, then the load distribution is improved, but the pin still experiences excessive stress
Solution Approach 1:
The patent defines specific geometric relationships between the support surfaces and the pin opening position. By optimizing these parameters, the support surfaces are positioned to maximize load-bearing contact area and distribute loads effectively, while the pin opening is positioned at a distance that prevents the pin from bearing excessive stress, thus resolving the contradiction between load distribution and pin stress.
Data Source
AI summary
The invention relates to an adapter and a wear element of a shovel of an earth moving machine attached to one another by means of a pin, wherein the pin is positioned at a point such that, as there is relative rotation between the wear element and the adapter, due to the application of both a force according to direction Y applied on a point B1 and directed towards a point B2 and a force according to direction Y applied on point B2 and directed towards point B1, the support surfaces of the adapter and of the wear element contact one another before the pin is subjected to stresses. The stresses the pin must withstand are thereby reduced.