Dual-Attachment Tow Hook for Off-Road Load and Crash Control
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Solution Overview
Problem
Current tow hook designs on North American pickup trucks fail to meet off-road strength and stiffness requirements while maintaining crash performance and deformation modes of the vehicle's front body structure.
Innovation Solution
A tow hook system with a first attachment mechanism secured to the bumper beam and a second attachment mechanism secured to the fender apron via a gusset, allowing load transfer and featuring a laterally offset shape that bends downwardly under threshold loads to distribute load effectively.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a tow hook is permanently mounted to the bumper beam with a simple attachment, then the rugged appearance is maintained, but the off-road strength and stiffness requirements are not met
Solution Approach 1:
The attachment mechanism is divided into two separate attachment mechanisms: a first attachment mechanism that secures the tow hook to the bumper beam, and a second attachment mechanism that secures the tow hook to the fender apron. This segmentation allows each attachment point to be optimized for specific load paths, thereby meeting off-road strength requirements without requiring an overly complex single-attachment design.
Solution Approach 2:
The tow hook is configured with a laterally offset shape that enables attachment to both the bumper beam (front attachment) and the fender apron (rear attachment). By utilizing multiple spatial dimensions and attachment locations, the design achieves enhanced strength and stiffness through distributed load paths without proportionally increasing overall complexity.
2Strength
If a tow hook is rigidly mounted to meet off-road strength requirements, then off-road strength is improved, but crash performance and deformation mode of the front body structure are affected
Solution Approach 1:
The tow hook incorporates a flexible portion that can bend under excessive loads. During off-road recovery operations, the rigid attachment mechanisms provide necessary strength. During high-speed crashes exceeding threshold loads, the flexible portion bends downwardly, allowing the tow hook to deform in a controlled manner that prevents excessive intrusion into the vehicle cabin while maintaining attachment integrity.
Solution Approach 2:
The tow hook's flexible portion changes its structural parameter (bending state) based on load magnitude. Under normal off-road loads, it maintains a rigid state for strength. Under excessive crash loads exceeding a threshold, it transitions to a bent state, changing the load path and protecting the vehicle cabin, thus adapting to different operational conditions.
3Strength
If the tow hook is designed with a single attachment point, then the device complexity is reduced, but the load distribution and strength requirements cannot be met
Solution Approach 1:
The attachment system is segmented into two distinct attachment mechanisms located at different positions: the first attachment mechanism at the front securing the tow hook to the bumper beam, and the second attachment mechanism at the rear securing the tow hook to the fender apron. This segmentation creates multiple load paths that distribute forces more effectively throughout the vehicle structure, meeting strength requirements without requiring an excessively complex single-attachment solution.
4Reliability
If the tow hook remains straight under load, then the attachment integrity is maintained, but excessive intrusion into the vehicle cabin may occur during high-speed crashes
Solution Approach 1:
The flexible portion of the tow hook is designed to maintain structural integrity under normal off-road loads while remaining capable of controlled deformation under excessive crash loads. During high-speed crashes exceeding threshold loads, the flexible portion bends downwardly in a predictable manner, absorbing energy and preventing excessive intrusion into the vehicle cabin, thereby protecting occupants while maintaining attachment integrity.
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 enhances off-road strength and stiffness while maintaining crash performance by distributing loads and preventing excessive intrusion into the vehicle cabin during high-speed crashes.
Implementation Method 1
The tow hook may be configured to transfer a load from the tow hook to the fender apron
Implementation Method 2
the tow hook may be configured to bend downwardly with an application of a load above a threshold load, causing less than all of the load to be transferred to the fender apron
Data Source
AI summary
A tow hook system is provided. The tow hook system may comprise a tow hook, comprising a first attachment mechanism configured to secure the tow hook to a bumper beam of a vehicle, and a second attachment mechanism configured to secure the tow hook to a fender apron of the vehicle. The tow hook may be configured to transfer a load from the tow hook to the fender apron.