Earth-Moving Machine Pin With Segmented Rotation Area
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Solution Overview
Problem
Existing pins used in tooth-adapter assemblies of earth-moving machines bend during operation, making it difficult to disassemble and replace worn teeth due to misalignment of the pin's axis of rotation, leading to increased friction and difficulty in removal.
Innovation Solution
A pin design with a pressure area at one or both ends, featuring segments perpendicular to the axis of revolution, allowing for easy disassembly by rotating less than 90 degrees to release contact with the tooth, facilitated by actuation means such as tool housings or projections, reducing friction and enabling smooth removal.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the pin is used in the tooth-adapter assembly during operation, then the tooth is securely locked to the adapter, but the pin bends due to significant stressing, making disassembly difficult
Solution Approach 1:
The pin is divided into distinct functional segments: a pressure area with contact segments for locking, and a rotation area for disassembly. This segmentation allows the pin to perform different functions in different zones, resolving the contradiction between maintaining strong locking and enabling easy disassembly even when bent.
Solution Approach 2:
The invention inverts the traditional approach by designing the pin so that rotation for disassembly occurs in a specific area rather than requiring full rotation of the entire pin. The rotation area is specifically designed to facilitate movement in the opposite direction of the locking mechanism, allowing easy removal even when the pin is bent during operation.
2Reliability
If the pin axis of rotation becomes curved when bent, then the pin withstands operational forces, but the pin cannot be rotated for removal, increasing friction and difficulty in disassembly
Solution Approach 1:
The invention extracts the rotation function from the entire pin and concentrates it in a specific rotation area. This allows the pin to maintain its curved axis during operation for reliability, while the dedicated rotation area provides a predictable path for removal, reducing the complexity of disassembly despite the bent state.
Solution Approach 2:
The rotation area acts as an intermediary zone between the pressure area and the rest of the pin. It mediates the transition from the locked state to the removed state by providing a specific area designed for rotational movement, even when the pin axis is curved, thereby simplifying the removal process.
3Ease of operation
If the pin is designed with a straight axis for easy rotation, then disassembly is simple, but the pin bends under operational stress, compromising structural integrity
Solution Approach 1:
The pin is designed with different local qualities: the pressure area has a configuration optimized for withstanding operational forces and locking, while the rotation area has a configuration optimized for facilitating removal. This local differentiation allows the pin to be structurally strong during operation while remaining easy to remove when needed.
Data Source
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AI summary
The invention relates to a pin for the coupling between a tooth and an adapter of earth-moving machines, having an elongated body of revolution around an axis and being inserted between the tooth and the adapter to secure the coupling between both. The pin object of the present invention has a particular configuration on the contour or perimeter of at least one of its two ends.