Two-Stage Overload Clutch for Winch Torque Slip Control
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing winch systems in aircraft face challenges in managing torque transmission efficiently to prevent overload, particularly in situations where the winch cable slips, which can lead to damage to the winch or attached structures.
Innovation Solution
A two-stage clutch system with a clutchpack, first and second springs, and an engagement nut that adjusts pressure to manage torque transfer between input and output shafts, including needle bearings to reduce friction and a mechanism to limit pressure increase based on rotation, ensuring controlled torque application.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a single-stage clutch is used to transmit torque from motor to drum, then the structure is simple, but it cannot effectively manage varied torque transmission and prevent overload
Solution Approach 1:
The clutch is divided into two distinct stages: a first clutch stage with a first spring for normal torque transmission, and a second clutch stage with a second spring for overload conditions. This segmentation allows each stage to handle specific torque ranges, providing effective overload protection while maintaining reasonable structural organization through modular design.
Solution Approach 2:
The clutch incorporates a movable engagement nut that can shift between engaging the first pressure plate (first stage) and the second pressure plate (second stage). This dynamic reconfiguration allows the clutch to adapt its torque transmission characteristics based on operational conditions, transitioning between stages to provide both normal operation and overload protection.
2Reliability
If clutch pressure is increased to prevent slipping, then torque transmission reliability improves, but the risk of overload damage increases
Solution Approach 1:
The engagement nut is designed to move dynamically between two engagement positions: when engaged with the first pressure plate, it provides moderate pressure for normal operation; when engaged with the second pressure plate, it provides increased pressure for high-torque conditions. This dynamic adjustment ensures adequate torque transmission while preventing dangerous overload conditions through the second spring's softer characteristics.
Solution Approach 2:
The clutch system changes the pressure parameter by engaging different springs based on operational needs. The first spring provides a first pressure level for normal torque transmission, while the second spring provides a second pressure level for overload conditions, allowing the system to adapt pressure parameters to match actual torque requirements and avoid excessive pressure damage.
3Reliability
If a two-stage clutch system is implemented with movable engagement nut, then torque management is improved, but device complexity increases
Solution Approach 1:
The engagement nut serves multiple functions: it engages with either the first or second pressure plate depending on operational conditions, it moves axially to select between clutch stages, and it provides automatic torque management. This multi-functionality reduces the need for additional separate components, managing complexity while achieving reliable two-stage torque control.
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 clutch system effectively manages torque transfer by increasing pressure to prevent overload and slipping, ensuring safe operation and reducing the risk of damage to the winch system components.
Implementation Method 1
a first spring configured to apply a first pressure to the clutchpack to compress the clutchpack
Implementation Method 2
a second spring configured to apply a second pressure to the clutchpack to compress the clutchpack
Implementation Method 3
a first needle bearing located between the first pressure plate and the basket and configured to reduce friction between the first pressure plate and the basket
Implementation Method 4
a second needle bearing located between the second pressure plate and the engagement nut and configured to reduce friction between the second pressure plate and the engagement nut
Implementation Method 5
a ball configured to be located between the basket and the input shaft and configured to set a maximum transferred torque of the clutch
Data Source
AI summary
A clutch having two stages for applying varied torque between an input shaft and an output shaft includes a clutchpack having input friction plates and output friction plates. The clutch further includes a first spring configured to apply a first pressure to the clutchpack to compress the clutchpack. The clutch further includes a second spring configured to apply a second pressure to the clutchpack to compress the clutchpack. The clutch further includes an engagement nut configured to move in response to rotation of the output shaft relative to the input shaft to compress the second spring in order to increase an amount of the second pressure applied to the clutchpack.