Portable Winch Torque Limiting Mechanism
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Solution Overview
Problem
Existing portable winch systems are prone to mechanical overload and degradation due to amplified torque, leading to increased manufacturing costs and potential for mechanical failure, especially when using planetary reduction gearboxes with two sets of gears.
Innovation Solution
Incorporating a torque-limiting device between the input and output shafts within the winch drum, which limits torque transmission to prevent overload and using a single set of differential planetary gears for reduced costs and enhanced durability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Force
If a planetary reduction gearbox with two sets of gears is used, then torque amplification is increased, but manufacturing costs increase and device complexity increases
Solution Approach 1:
The patent removes one set of planetary gears from the transmission system, keeping only a single set instead of two. This extraction of the redundant gear set reduces manufacturing complexity and cost while maintaining sufficient torque amplification through the retained planetary gear mechanism combined with the drum geometry.
Solution Approach 2:
The patent modifies the transmission ratio by changing from a two-stage planetary gear system to a single-stage system with adjusted gear parameters. By optimizing the number of teeth on the sun gear, planet gears, and ring gear, the system achieves the required torque amplification with fewer components, reducing manufacturing costs while maintaining performance.
2Force
If a planetary reduction gearbox with two sets of gears is used, then torque amplification is increased, but device complexity increases
Solution Approach 1:
The patent extracts and removes the second set of planetary gears from the system, retaining only one set. This simplification reduces the number of moving parts, assembly steps, and maintenance requirements while the single planetary set continues to provide adequate torque multiplication for the handheld winch application.
Solution Approach 2:
The patent segments the torque multiplication function between a single planetary gear set and the drum geometry itself. Rather than relying solely on multiple gear stages, the system divides the torque amplification task between the gear train and the mechanical advantage provided by the drum and cable arrangement, reducing overall system complexity.
3Force
If torque is amplified by the planetary reduction gearbox, then pulling force is increased, but mechanical overload and degradation occur
Solution Approach 1:
The patent incorporates a torque limiter mechanism that proactively prevents torque from exceeding a predetermined threshold before damage can occur. This preliminary protective action engages when excessive torque is detected, disengaging the drive train to protect the planetary gears and other components from overload degradation, thereby extending system life while maintaining high pulling force during normal operation.
4Force
If the winch is designed for high torque output, then pulling capability is improved, but the device becomes too heavy for handheld operation
Solution Approach 1:
The patent replaces a portion of the mechanical torque multiplication system with a torque-limiting mechanism that uses a spring-loaded clutch or shear pin design. This substitution allows the system to achieve high pulling capability through intelligent torque management rather than simply adding more heavy gears, keeping the overall device weight suitable for handheld operation.
Solution Approach 2:
The patent optimizes the gear ratios and component dimensions to achieve the necessary torque output with minimized mass. By carefully selecting the number of teeth, gear module, and material properties, the system attains high pulling capability while keeping each component as light as possible, maintaining portability for handheld use.
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 solution effectively reduces the likelihood of mechanical degradation by capping torque at a predetermined threshold, allowing the winch to operate safely as a handheld device while minimizing manufacturing costs and maintaining performance.
Implementation Method 1
a torque-limiting device positioned within the drum, the torque-limiting device including a torque-limiting mechanism situated between the externally actuatable input shaft and the output driven shaft
Implementation Method 2
a transmission including an input and a ring gear, the input coupled to the output driven shaft and the ring gear coupled to the output end of the drum
Implementation Method 3
a differential planetary gear system
Data Source
AI summary
Methods and systems are provided for an externally actuatable pulling tool assembly. An example system may include a drum enclosing an externally actuatable input drive shaft, an output driven shaft, and a torque-limiting device positioned in-between the externally actuatable input drive shaft and the output driven shaft. The output driven shaft may be coupled to a transmission with a ring gear, the ring gear meshing with a plurality of teeth on an output end of the drum.