Excavator Pin Retaining Device with Integrated Spring
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Solution Overview
Problem
Existing pin retention systems for excavators and similar machinery fail to securely retain pins at high temperatures and require excessive force for assembly and disassembly, often using elastomeric materials that degrade and necessitate hammer-based methods, leading to safety and operational issues.
Innovation Solution
A female part with a cavity that integrates a retaining device, allowing for hammerless pin retention and easy replacement, where the retaining device is attached internally and interacts with the pin to maintain coupling between male and female parts, eliminating the need for elastomeric materials and reducing assembly forces.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If elastomeric materials are used in retaining devices, then pin retention is provided, but the materials degrade at high temperatures causing loss of retention reliability
Solution Approach 1:
The patent removes elastomeric materials from the retaining device design. The retaining device is constructed entirely from metal components (body, spring, and retaining element) that can withstand high temperatures without degradation, eliminating the temperature sensitivity issue while maintaining pin retention functionality through mechanical means alone
Solution Approach 2:
The patent changes the material parameters of the retaining device from elastomeric to metal-based materials. The spring element uses metal elasticity instead of elastomeric properties, providing temperature-independent retention forces suitable for high-temperature environments such as those found in excavator applications
2Reliability
If traditional retaining devices are used, then pin retention is achieved, but excessive force is required for assembly and disassembly
Solution Approach 1:
The patent employs a dynamic spring element that provides elastic retention forces during normal operation to secure the pin, but allows for controlled release when disassembly force is applied. The spring can be compressed or expanded to release the retaining element, enabling easy hammerless assembly and disassembly while maintaining secure retention during operation
Solution Approach 2:
The retaining device uses the spring's elastic properties to automatically engage and disengage the retaining element without requiring external tools or excessive force. The spring stores and releases energy to facilitate pin insertion and removal, making the system self-servicing during assembly and disassembly operations
3Ease of manufacture
If hammer-based assembly methods are used, then pin installation is achieved, but safety risks and operational inefficiency increase
Solution Approach 1:
The patent replaces the hammer-based mechanical impact system with a controlled elastic spring mechanism. The spring element can be compressed or expanded using simple manual force or tools to release the retaining element, eliminating the need for hammer strikes and associated safety risks while improving assembly efficiency
Solution Approach 2:
The spring element acts as an intermediary between the operator and the pin retention system. Instead of directly impacting the pin with a hammer, the operator interacts with the spring mechanism, which then controls the engagement and disengagement of the retaining element, providing a safer and more controlled assembly process
4Ease of manufacture
If retaining devices are not integrated into the female part, then manufacturing is simpler, but replacement operations become more complex
Solution Approach 1:
The patent integrates the retaining device directly into the female part as a built-in component rather than a separate assembly. The retaining device body is formed as part of the female part structure, with the spring and retaining element positioned within the female part's cavity. This integration simplifies the overall assembly and ensures proper positioning while maintaining ease of replacement for the entire female part assembly
Data Source
AI summary
A female part, a retaining device and a pin system have the device, the female part and a male part, to assure the retention between the female part and a male part used in excavators and the like. The female part has a cavity and can be a wearing element, a tooth or an intermediate part (part between a point and a weld on or cast nose in a three part system) and the male part has a nose to be introduced into the cavity of the female part and this will usually be a tooth-holder, intermediate, cast nose, weld-on nose or an adapter.