Trailer Hitch Reducing Pin Sleeve for High-Strength Drawbar Adaptation
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Solution Overview
Problem
Existing trailer hitch systems face challenges in accommodating drawbars with reduced dimensions, particularly when using a 3″ receiver with a ¾″ hitch pin hole, as aftermarket ⅝″ pins are not rated higher than 20,000 lbs., requiring modifications that are not satisfactory.
Innovation Solution
A reducing pin sleeve with an inner diameter of ⅝″ and an outer diameter of ¾″ is fitted into the hitch pin hole of the drawbar, allowing a high strength ⅝″ hitch pin to be used, which is rated higher than 20,000 lbs., and is adaptable for use with 2″, 2½″, and 3″ drawbars.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a 3/4" hitch pin hole is used in a 3" drawbar, then the drawbar can be accommodated, but the pin strength is limited to 20,000 lbs. capacity
Solution Approach 1:
The reducing pin sleeve is nested inside the drawbar's hitch pin hole, creating a concentric arrangement where the 5/8" sleeve fits within the 3/4" hole. This nesting allows the smaller diameter high-strength pin to be used while maintaining compatibility with the larger 3" drawbar through the intermediate sleeve structure.
Solution Approach 2:
The reducing pin sleeve acts as an intermediary component between the 3" drawbar and the 5/8" high-strength pin. It mediates the size mismatch by providing a 5/8" diameter interface that accepts the high-strength pin, while the outer 3/4" diameter accommodates the 3" drawbar, thus enabling the use of higher capacity pins without modifying the drawbar itself.
2Strength
If a 5/8" pin is used with a 3" drawbar having a 3/4" pin hole, then pin capacity is improved, but the pin does not fit without modification
Solution Approach 1:
The reducing pin sleeve is pre-installed into the 3/4" hitch pin hole of the drawbar before the high-strength pin is installed. This preliminary action prepares the assembly by creating the correct 5/8" diameter receptacle, so that when the high-strength pin arrives, it fits directly without requiring any field modification or enlargement of the original 3/4" hole.
3Strength
If the 3/4" pin hole is enlarged to accommodate a 5/8" pin, then pin capacity increases, but structural integrity may be compromised
Solution Approach 1:
Instead of modifying the original 3/4" pin hole in the drawbar, the solution extracts the problem by introducing a separate reducing pin sleeve component. The sleeve is installed as a distinct element that provides the 5/8" diameter interface, thereby eliminating the need to enlarge or alter the original drawbar hole and preserving the structural integrity of the drawbar itself.
Data Source
AI summary
The disclosed inventive concept provides a trailer hitch arrangement for use with a drawbar that is adaptable to universally use a high strength conventional hitch pin. Particularly, a reducing pin sleeve is fitted into the hitch pin hole of the drawbar. The inner diameter of the reducing pin sleeve is less than the hitch pin hole conventionally formed in the drawbar while the inner diameter of the reducing pin sleeve is the same as that of the receiver. When the drawbar is fitted into the receiver, the reducing pin sleeve is captured therein, thus preventing side-to-side movement relative to the drawbar. The disclosed inventive concept allows vehicle owners having a standard 3″ receiver trailer hitch which conventionally includes a ⅝″ hitch pin hole to safely and effectively handle above 20,000 lbs. trailer rating by insertion of the hitch pin sleeve into the ¾″ hitch pin hole provided in the drawbar.