Ground Engaging Tool Retention System with Self-Adjusting Wedge
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Solution Overview
Problem
Existing retention systems for ground engaging tools on earth-working machines are costly, difficult to manufacture, and require frequent adjustments due to wear, leading to potential misalignment and increased maintenance costs.
Innovation Solution
A tool retention system featuring a spool with an elongated channel and collar, a fastener with a resilient member and slider, and a wedge that interlocks only when the slider is out of a pocket, allowing for self-adjustment and maintaining constant tension through a Belleville washer or similar mechanism.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a toothed engagement mechanism is used between the block and clamp, then the connection strength is improved, but the manufacturing complexity and cost increase significantly
Solution Approach 1:
The patent removes the complex toothed engagement mechanism from the retention system and replaces it with a simple wedge-and-clamp design. The wedge forces the clamp tighter against the tool body through direct mechanical force, eliminating the need for difficult-to-manufacture toothed geometries while maintaining strong connection.
Solution Approach 2:
Instead of using positive engagement (teeth interlocking), the system uses negative engagement where the wedge creates compressive force that presses the clamp firmly against the tool body. This inversion from tensile/interlocking forces to compressive forces simplifies the geometry and manufacturing.
2Reliability
If the rod is rotated to adjust the clamp tightness after wear, then the connection reliability is improved, but the adjustment complexity and time increase
Solution Approach 1:
The retention system is designed to be self-adjusting through the wedge mechanism. As the clamp wears and the tool body settles, the wedge can be repositioned or the rod rotated to automatically compensate for wear, maintaining constant tension without requiring complex measurement or multiple adjustment steps.
Solution Approach 2:
The system transitions from a static fixed-position clamp to a dynamic adjustable system where the rod can be rotated to reposition the wedge and clamp assembly, allowing continuous adaptation to wear conditions and maintaining optimal connection reliability over time.
3Strength
If the wedge is forced further into the tool body to tighten the clamp, then the connection strength is improved, but the risk of over-insertion and difficulty of replacement increases
Solution Approach 1:
The retention system incorporates preliminary design features such as a threaded rod with controlled engagement and a wedge geometry that naturally limits insertion depth. These preliminary measures prevent over-insertion before it occurs, ensuring the wedge remains accessible for adjustment and replacement while still achieving sufficient clamping force.
Solution Approach 2:
The threaded rod acts as an intermediary mechanism between the external adjustment tool and the wedge. It provides controlled, incremental movement of the wedge into the tool body, preventing direct forceful insertion that could lead to over-insertion, while still enabling the wedge to be forced far enough to achieve strong clamping.
4Ease of manufacture
If a fixed-size clamp is used, then the manufacturing cost is reduced, but the adaptability to different wear stages decreases
Solution Approach 1:
The system uses a dynamically adjustable clamp position through the rotating rod mechanism. A single clamp size can be repositioned along the rod to accommodate different wear stages of the tool body, providing versatility without requiring multiple clamp sizes or increased manufacturing complexity.
Solution Approach 2:
The rod-wedge-clamp assembly serves multiple functions: initial installation, wear compensation, and secure retention. A single standardized clamp design can be used across different tool applications and wear conditions by adjusting the rod position, achieving universality without sacrificing adaptability.
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
The system provides a simple, cost-effective, and low-maintenance solution by automatically accommodating wear and maintaining secure connection of ground engaging tools to work implements, reducing the need for frequent adjustments and extending the operational life of the components.
Implementation Method 1
maintaining constant tension through a Belleville washer or similar mechanism
Data Source
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AI summary
A retention system (20) is provided for use with a ground engaging tool (14). The tool retention system may have a spool (26) with an elongated channel (60), and a collar (68) dividing the elongated channel into a first portion and a second portion. The tool retention system may also have a fastener (32) disposed within the elongated channel and passing through the collar. The fastener may have a head located within the first portion and a threaded shank located within the second portion. The tool retention system may further have a resilient member (34) disposed between the head of the fastener and the collar, and a slider (30) threadingly engaged with the threaded shank and configured to slide within the second portion of the elongated channel as the fastener is rotated.