Socket-and-Pin Coupling for Soil-Working Tool Wearing Parts
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Solution Overview
Problem
Quick-fit wearing-part systems for implements like ploughshares and loader buckets face challenges due to cracking under high stresses during assembly and daily use, as existing designs often apply excessive lateral forces and lack adequate structural support.
Innovation Solution
A socket-and-pin type quick-fit coupling with guide portions providing lateral and vertical support, featuring elevations and recesses for engagement, allows for a loose fit and sliding attachment, reducing stress concentrations and improving structural integrity by distributing forces more evenly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a socket-and-pin quick-fit coupling is used for attaching wearing parts, then ease of assembly and disassembly is improved, but cracking occurs due to high stresses during assembly and daily use
Solution Approach 1:
The coupling system is divided into separate socket and pin components that can be independently designed and optimized. The pin is inserted through the socket, creating distinct functional zones that distribute stress more effectively than a monolithic design, reducing cracking while maintaining quick-fit capability
Solution Approach 2:
The pin acts as an intermediary element between the holder and wearing part, transferring loads through a controlled path. This intermediate component absorbs and distributes assembly and operational stresses, preventing direct stress concentration that would cause cracking in the holder or wearing part
2Manufacturing precision
If guide portions provide lateral support to the wearing part, then positioning accuracy is improved, but excessive lateral forces are applied causing stress concentrations
Solution Approach 1:
The guide portions are designed with specific local geometries that provide lateral support only where needed for positioning, while other areas maintain flexibility to accommodate operational movements. This localized guidance reduces overall lateral force application while maintaining positioning accuracy during assembly
3Strength
If a tight fit is used in the socket-and-pin coupling, then connection strength is improved, but stress concentrations increase leading to cracking
Solution Approach 1:
The coupling employs a partial interference fit where only specific portions of the pin and socket engage with interference, while other portions allow clearance. This partial action provides sufficient connection strength for operational loads while avoiding excessive stress concentrations that would cause cracking under assembly or thermal conditions
Data Source
AI summary
A wearing part arrangement (1) provided with a holder (11) providing releasable attachment of a wearing part (12) by means of a socket-and-pin type quick-fit coupling, wherein the holder (11) comprises a pair of opposing first guide portions (1132) being arranged to face corresponding supporting faces (1221) provided on the wearing part (12), and a pair of second guide portions (1134) arranged to face corresponding top faces (1223) of the wearing part (12), wherein one of the pair of the opposing first guide portions (1132) and the corresponding side supporting faces (1221) of the wearing part (12) is provided with at least one elevation (1222), and the other one of the pair of the opposing first guide portions (1132) and the corresponding side supporting faces (1221) is provided with a corresponding recess (1135) arranged for receipt of the elevation (1222) when the wearing part (12) is in engagement with the holder (11).