Galvanized Trailer Coupler Assembly with Masked Kingpin
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Solution Overview
Problem
The upper coupler assembly of semi-trailers is prone to corrosion from road debris, and traditional galvanization methods can compromise the strength and wear resistance of the kingpin made from alloy steel.
Innovation Solution
A partially galvanized upper coupler assembly is created by masking specific areas during the galvanization process, allowing the kingpin to maintain its strength and wear resistance while still providing corrosion protection, and then coating the ungalvanized areas with a rust-resistant coating.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the kingpin is subjected to the galvanization process, then corrosion protection is improved, but the kingpin loses its strength and wear resistance or becomes subject to hydrogen embrittlement
Solution Approach 1:
The upper coupler assembly is divided into two parts: the frame and the kingpin. The frame is galvanized for corrosion protection, while the kingpin is left ungalvanized to maintain its strength and wear resistance properties. This segmentation allows each component to receive the appropriate treatment for its specific functional requirements.
Solution Approach 2:
Different parts of the assembly receive different treatments based on their specific needs. The frame receives galvanization for corrosion protection in areas exposed to road debris, while the kingpin maintains its original alloy steel properties for strength and wear resistance at the coupling interface.
2Reliability
If the upper coupler assembly is fully galvanized, then corrosion protection is improved, but the manufacturing complexity increases due to masking requirements
Solution Approach 1:
The kingpin is extracted from the galvanization process entirely. Instead of attempting to mask and galvanize around the kingpin, the solution removes the kingpin from the galvanization scope, attaching it after the frame is galvanized. This eliminates the need for complex masking operations.
Solution Approach 2:
The frame is galvanized before the kingpin is attached. This preliminary galvanization of the frame eliminates the need for masking during the galvanization process, as the kingpin is not yet in place. The sequence is reversed from conventional approaches to simplify the manufacturing process.
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 method effectively protects the upper coupler assembly from corrosion without compromising the kingpin's properties, ensuring durability and longevity while allowing for attachment to a truck tractor's fifth wheel.
Implementation Method 1
galvanizing the portions of the frame that are not covered by the mask
Data Source
AI summary
A method of making a galvanized upper coupler assembly for use in a trailer and the corresponding upper coupler assembly apparatus is disclosed. The method comprises the steps of providing a frame, covering at least one area of the frame with a mask, galvanizing the portions of the frame that are not covered, removing the mask, providing a kingpin, and attaching the kingpin to the frame. After attachment of the kingpin to the frame, the combined assembly can be coated with a rust resistant coating if desired, a cover plate can be attached to the frame, over the kingpin.