Compact Moment Bar Hitch for Stable Trailer Weight Distribution
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Solution Overview
Problem
Conventional trailer hitches face challenges such as tedious setup and adjustment, susceptibility to sway, and instability on uneven terrain due to stiff moment bars, which can lead to safety issues and traction loss.
Innovation Solution
A weight distribution hitch system with a compact, compliant moment bar made from flexible materials like fiber-reinforced polymers, which allows for easier setup, improved sway control, and stability on uneven ground by reducing the need for frequent adjustments and minimizing sudden changes in moment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional equalizer hitches with spring bars are used, then weight distribution is improved, but setup complexity and adjustment difficulty increase
Solution Approach 1:
The patent changes the key parameter from spring bar stiffness to moment bar length. By providing moment bars of different lengths (e.g., 24 inches, 28 inches, 32 inches) that can be easily swapped, the system achieves weight distribution adjustment without the complexity of adjusting spring bar tension. The user simply replaces the moment bar with a different length to accommodate changes in tow vehicle, trailer, or load.
Solution Approach 2:
The patent extracts the adjustment mechanism from the spring bar tensioning system and separates it into a standalone moment bar length selection. This allows the weight distribution function to be maintained while the adjustment process is simplified to merely changing the moment bar length, eliminating the need for complex spring bar tension adjustments.
2Strength
If stiff moment bars are used, then structural strength is improved, but adaptability to uneven terrain and sway control worsen
Solution Approach 1:
The patent introduces dynamics by allowing the moment bar to rotate or pivot at its connections to the vehicle attachment member and trailer coupler. This rotational freedom enables the rigid moment bar to adapt to uneven terrain and reduce sway by accommodating angular movements rather than transmitting rigid forces, thus maintaining strength while improving adaptability.
Solution Approach 2:
The patent changes the effective stiffness parameter by providing multiple moment bar lengths. Shorter moment bars provide greater stiffness and are suitable for lighter loads or specific terrain conditions, while longer moment bars provide more flexibility for heavier loads or uneven terrain. This allows the user to optimize the stiffness-adaptability balance based on specific towing conditions.
3Force
If moment bar length is increased, then weight distribution leverage is improved, but device complexity and adjustment range requirements increase
Solution Approach 1:
The patent segments the moment bar function into discrete length options (e.g., 24 inches, 28 inches, 32 inches) rather than providing a continuous adjustment mechanism. This segmentation simplifies the device by eliminating complex adjustment mechanisms while still providing sufficient leverage variation through the selected length, thus improving force application without increasing overall system complexity.
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 system simplifies setup and adjustment, enhances safety by reducing sway and maintaining traction on uneven terrain, and provides a larger adjustment range, reducing the need for frequent adjustments and minimizing sudden changes in moment, thus ensuring a stable and secure towing experience.
Implementation Method 1
a tension member comprising a top end configured to be supported by a frame member of the trailer, and a bottom end configured to support the rearward end of the moment bar, and wherein, when the tension member is in tension, it imposes an upward force on the moment bar rearward end
Implementation Method 2
wherein the length of the moment bar is less than 28 inches
Data Source
AI summary
A weight distribution hitch system comprising a vehicle attachment member comprising a forward end configured to rigidly attach to a vehicle, and a rearward end extending rearwardly toward a trailer, the rearward end comprising an upper portion comprising a trailer attachment member configured to pivotally attach to a coupler of the trailer, and a lower portion configured to receive a moment bar, a moment bar forward end attached to the lower portion of the rearward end of the vehicle attachment member so as to prevent rotation about a horizontal axis, and a moment bar rearward end; a tension member comprising a top end configured to be supported by a frame member of the trailer, and a bottom end configured to support the rearward end of the moment bar, and wherein, when the tension member is in tension, it imposes an upward force on the moment bar rearward end, which, in turn, imposes a forward moment on the vehicle; and wherein the length of the moment bar is less than 28 inches is disclosed.