Dual-Gear Winch Pawl Assembly for Spring Failure Reliability
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Solution Overview
Problem
Conventional ratchet mechanisms in car hauler trailers rely on springs to keep the pawl engaged with the gear, but these springs frequently fail and need replacement, leading to reliability issues.
Innovation Solution
A dual-gear winch system with a pawl and support bracket assembly, utilizing torsion and compression springs to engage and disengage the gear assembly, ensuring reliable operation and reducing maintenance needs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single spring is used to keep the pawl engaged with the gear, then the device complexity is reduced, but the reliability deteriorates due to frequent spring failure
Solution Approach 1:
The single spring is segmented into two separate springs (first spring and second spring), each responsible for one pawl tip. This segmentation ensures that if one spring fails, the other spring can still maintain pawl engagement with the gear, thereby improving reliability while keeping the overall system relatively simple
Solution Approach 2:
Different springs are assigned to different pawl tips based on their specific engagement requirements. The first spring engages the first pawl tip with the first gear tooth, while the second spring engages the second pawl tip with the second gear tooth, allowing localized optimization of engagement quality at each contact point
2Device complexity
If gravity is used to act on the pawl, then the device complexity is reduced, but the adaptability deteriorates because the winch is not always in an orientation where gravity acts correctly
Solution Approach 1:
The gravitational field is replaced with a mechanical spring system. Instead of relying on gravity to act on the pawl, two springs provide the necessary mechanical force to engage the pawl tips with the gear teeth, enabling the winch to function reliably in any orientation without being dependent on gravitational direction
3Reliability
If a dual-gear system with two springs is implemented, then the reliability is improved through force distribution, but the device complexity increases
Solution Approach 1:
The dual-gear system combines two gear assemblies with two pawl tips and two springs into a single integrated winch mechanism. The gears work together to provide redundant engagement points, and the springs are positioned to work in parallel, creating a unified system where the components support each other's function rather than operating as separate systems
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 dual-gear winch design reduces the risk of failure and lowers maintenance costs by distributing force through dual-pawl tips, enabling easy engagement and disengagement, and using widely available springs for reliable securement.
Implementation Method 1
a torsion spring configured to keep the winch pawl engaged to the gear assembly
Implementation Method 2
a compression spring configured to push the winch pawl away from the gear assembly when the compression spring is compressed
Data Source
AI summary
A dual-gear winch includes: a winch plate; a gear assembly coupled to the winch plate and configured to rotate with respect to the winch plate; a support bracket assembly coupled to the winch plate, the support bracket assembly including a hook; and a winch pawl including a slot, wherein the winch pawl is positioned to move the slot to accept the hook and to disengage from the gear assembly, or wherein the winch pawl is positioned to move the slot out and away from the hook and to engage the gear assembly.