Elastomeric Retention Cap for Ground Engaging Tool
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Solution Overview
Problem
Existing retention systems for ground engaging tools in earth-working machines are prone to loosening due to dislodgment of the resilient cap, leading to unwanted rotation of the rod and inadequate clamping force, which can result in failure of the connection between the tool and the work implement.
Innovation Solution
A retention cap with an expandable rubber insert and a threaded fastener system that compresses and expands laterally within the tool interface, combined with a C-shaped clamp and wedge configuration, to securely engage the ground engaging tool to the work implement, preventing unintentional rotation and loosening.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a resilient cap is used to prevent rotation of the rod, then the retention system is simplified, but the cap may be dislodged during use allowing unwanted rotation and loosening
Solution Approach 1:
The patent changes the physical state of the retention plug material from rigid to elastomeric. The elastomeric material can deform under compression and expand laterally to engage with the tool interface, providing a more reliable retention mechanism that cannot be easily dislodged compared to a rigid cap
Solution Approach 2:
The retention system combines multiple materials with different properties: the elastomeric retention plug provides flexible retention, the threaded fastener provides adjustable clamping force, and the tool interface provides structural engagement. This composite approach solves the reliability issue by using materials that complement each other's strengths
2Reliability
If the retention cap is made secure against dislodgment, then reliability improves, but the device complexity increases
Solution Approach 1:
The elastomeric retention plug automatically engages with the tool interface through its expansion mechanism. Once the threaded fastener is tightened, the plug self-secures by expanding laterally to fill the tool interface, eliminating the need for additional locking mechanisms or complex assembly steps
3Reliability
If the rubber insert is compressed axially, then it expands laterally to engage the tool interface, but excessive compression may damage the insert
Solution Approach 1:
The patent applies partial compression to the elastomeric retention plug through the threaded fastener system. The compression is sufficient to generate the necessary lateral expansion for reliable engagement with the tool interface, but controlled to remain within the elastic deformation range of the material, avoiding permanent damage
Solution Approach 2:
The elastomeric material inherently provides cushioning through its ability to deform. This material property protects against shock loads and prevents excessive stress concentration that could damage the retention plug, while still maintaining reliable engagement under normal operating conditions
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 solution provides a secure and reliable connection that withstands wear and abrasion, prolonging the life of the work implement and ground engaging tools by maintaining clamping force and preventing system loosening during operation.
Implementation Method 1
Rotation of the nut or threaded fastener is configured to compress and cause lateral expansion of the rubber insert within a tool interface of a fastener
Data Source
AI summary
A retention system is provided for use with a ground engaging tool. The tool retention system may have a generally C-shaped clamp configured to be disposed within an aperture of a work implement and to engage apertures in a tool adapter and a wedge disposed within the apertures of the tool adapter and the work implement and against the generally C-shaped clamp. The retention system may additionally have a generally C-shaped slider disposed within the apertures of the tool adapter to engage the aperture of the work implement and a fastener configured to connect the generally C-shaped slider to the wedge. A retention cap with an expandable retention washer may be secured over a head of the fastener to prevent unwanted rotation.