Torque-Limiting Clutch Release Trigger for Leakage and Seizing Control
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Solution Overview
Problem
Existing torque limiting clutches for rotary shafts face issues with leakage, environmental concerns, inability to handle short torque spikes, temperature-induced pressure variations, and the risk of seizing damage due to low-hardness weldable materials.
Innovation Solution
A clutch design featuring a cam wheel with varying radii, a micro hydraulic control system, and a gasket seal instead of welding, allowing for precise torque control, quick disengagement, and reduced fluid leakage, using a cam wheel with a constant first radius and a smaller second radius to activate the channel system for fluid evacuation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of substance
If the thin-walled sleeve is welded to the housing to limit leakage, then leakage is reduced, but the risk of seizing damage increases due to low hardness of weldable materials
Solution Approach 1:
The clutch is divided into separate components: the thin-walled sleeve is not welded to the housing but is instead held in position by a retaining ring. This segmentation allows the sleeve to be made of hard material without welding, eliminating seizing damage risk while maintaining leakage prevention through proper sealing design.
Solution Approach 2:
A retaining ring acts as an intermediary component between the thin-walled sleeve and the housing. This intermediary holds the sleeve in position without requiring welding, allowing the use of hard materials for the sleeve while preventing direct contact between dissimilar materials that would cause seizing.
2Device complexity
If the disengaging mechanism uses a support leg with limited pivotal stability to detect relative angular movement, then the mechanism can be simple, but it cannot allow very short torque spikes without being tripped
Solution Approach 1:
The cam wheel provides a dynamic geometric solution where the varying radius creates different operational phases: a first angular interval allows normal operation and short torque spikes, while a second angular interval triggers disengagement. This dynamic geometry replaces the static, overly sensitive support leg mechanism.
Solution Approach 2:
The cam wheel's radius parameter changes across different angular intervals. By varying the radius, the mechanism can tolerate certain angular deviations (allowing short torque spikes) while still detecting significant relative angular movements (triggering disengagement), providing selective sensitivity rather than uniform response.
3Stability of the object's composition
If the chamber is sealed with large surfaces to maintain pressure, then pressure stability is improved, but leakage increases leading to torque threshold shifts
Solution Approach 1:
Instead of relying on large sealed surfaces throughout the chamber, the invention applies sealing locally at critical interfaces. The thin-walled sleeve engages a smooth complementary shaped surface of the shaft, creating localized high-quality seals where needed, rather than depending on extensive sealing surfaces that would increase leakage risk.
4Strength
If the clutch design uses a thin-walled sleeve for elastic deformation engagement, then the clutch can limit torque effectively, but the sleeve material must be weldable which limits hardness and causes seizing risk
Solution Approach 1:
The welding requirement is extracted from the design by separating the thin-walled sleeve from the housing connection. The sleeve is no longer welded to the housing but is instead retained by a retaining ring, freeing the material selection from welding constraints and allowing the use of hard, seizing-resistant materials.
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 design achieves reliable torque limiting with minimal leakage, environmental benefits, and reduced risk of seizing damage, enabling precise control of torque spikes and stable operation across temperature changes.
Implementation Method 1
a thin-walled sleeve forming an axially extended thin wall of the annular chamber, which chamber is arranged to be supplied with a pressurized fluid for substantially elastic deformation of the sleeve, so that a surface of the sleeve engages a smooth complementary shaped surface
Implementation Method 2
the cam wheel is arranged to be supported on an envelope surface at a contact point being within the first angular interval, in that the cam wheel is arranged to rotate in relation to envelope surface as a result of a relative angular movement between the shaft and the housing
Implementation Method 3
the chamber being connected to said channel system and the channel system being arranged to, when it is activated by said trigger device, assume a state in which the pressurized fluid can flow through the channel system away from the chamber
Data Source
AI summary
A clutch for a rotary shaft includes an annular pressure chamber with a sleeve surface engaging a surface to drivingly connect the shaft to the clutch, and further includes a trigger device and a channel system activatable by the trigger device upon a relative angular movement between the shaft and the chamber to release the shaft from the housing. The trigger device has a cam wheel having a constant first radius across a first angular interval and a second, smaller, radius across a second angular interval. The cam wheel is supported on an envelope surface within the first angular interval and rotating in relation to the envelope surface when the shaft rotates in relation to the housing. When a contact point reaches the second angular interval, the cam wheel is displaced to activate said channel system.