Slip Coupling Automatic Release Persistent Overload
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Solution Overview
Problem
Existing slip clutches in railway drives do not effectively and automatically disconnect the frictional connection between the motor and drive wheel axle during prolonged overloads, potentially causing damage due to excessive torque, and they do not differentiate between immediate and prolonged overloads.
Innovation Solution
A slip clutch design featuring a clamping nut with free-moving disks that allows slipping between clutch elements up to a limit angle without twisting the nut, and upon exceeding this angle, the clamping nut is rotated to reduce contact pressure and automatically release the torque, preventing immediate overload tripping and protecting against prolonged overload damage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a slip clutch is designed to immediately release during overload, then damage from excessive torque is prevented, but normal operation is interrupted even during brief torque spikes that cannot be avoided
Solution Approach 1:
The clutch element incorporates a dynamic overload indicator that changes state based on the duration and magnitude of overload conditions. This allows the clutch to distinguish between transient overloads that should be tolerated and persistent overloads that require release, enabling adaptive response rather than fixed immediate release
Solution Approach 2:
The clutch mechanism includes feedback through the overload indicator that monitors the state of the clutch elements and provides information about overload conditions. This feedback enables the system to determine whether to maintain or release the frictional connection based on actual operating conditions rather than predetermined fixed thresholds
2Power
If a slip clutch maintains strong frictional connection during normal operation, then torque transmission efficiency is improved, but the clutch fails to automatically release during prolonged overloads causing damage
Solution Approach 1:
The clutch mechanism is designed to automatically detect overload conditions through the relative positioning of clutch elements and the state of the overload indicator, and to self-release by reducing frictional connection without requiring external control systems or additional energy input, thereby serving itself during failure conditions
Solution Approach 2:
The frictional connection strength is made dynamic rather than static, allowing the clutch to automatically adjust the degree of engagement based on operating conditions. The overload indicator and relative positioning of clutch elements enable the system to transition from strong engagement during normal operation to reduced engagement during overload without external intervention
3Force
If the clutch elements are designed with large contact area, then the holding torque capacity is increased, but the clutch becomes more sensitive to overload conditions causing premature release
Solution Approach 1:
The clutch elements are designed with non-uniform pressure distribution across the contact area, with higher pressure concentrated at specific regions rather than uniformly distributed. This allows the overall holding torque capacity to remain high while localized stress during overload conditions is managed differently, preventing premature release
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 slip clutch effectively limits torque during overloads, preventing damage by automatically releasing the frictional connection when prolonged overloads occur, ensuring the drive train is protected against excessive torques and maintaining normal operation during normal torque conditions.
Implementation Method 1
a frictional connection between the motor and drive wheel axle
Implementation Method 2
one of the two coupling elements has a threaded pin arranged in alignment with the axis of rotation, onto which a clamping nut is screwed
Data Source
Figure 1
Figure 2~3
Figure 4~5
AI summary
Slip coupling with automatic release in the event of a persistent overload. A slip coupling has a pair of coupling elements (1, 3) which are both rotatable about a common axis of rotation (4) and each have a coupling surface (5, 6) encircling the axis of rotation (4) annularly. One coupling element (1) has a threaded pin (7) which is arranged in alignment with the axis of rotation (4) and onto which a clamping nut (9) is screwed, said clamping nut being usable to press the coupling surfaces (5, 6) of the coupling elements (1) against each other. As a result, a torque is transmitted up to an adhesive moment in a slip-free manner between the coupling elements (3, 1) and, furthermore, is limited to a sliding moment by the coupling elements (1, 3) slipping in relation to each other. Free motion discs (10, 11) are arranged between the clamping nut (9) and the other coupling element (3). The clamping nut (9), the free motion discs (10, 11) and the other coupling element (3) have driver elements (12 to 16) interacting with one another. The driver elements (12 to 16) permit the coupling elements (1, 3) to slip in relation to each other up to a limit angle without rotation of the clamping nut (9). Furthermore, when the coupling elements (1, 3) slip, the clamping nut (9) is inevitably rotated at the same time. The rotation of the clamping nut (9) changes the pressing of the coupling surfaces (5, 6) against each other and, as a result, the adhesive moment which can be transmitted in a slip-free manner.