Auto-Stop Seal Clutch Prevents Disengagement
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Solution Overview
Problem
Conventional fan clutch devices in vehicles become inoperable due to wear of friction surfaces, leading to engine overheating and inefficiency, as they cannot engage the fan blades when the friction ring wears below a threshold thickness, requiring manual intervention to install 'come home' bolts for temporary operation.
Innovation Solution
A clutch device with an auto-stop seal mechanism that prevents disengagement by using a pressurized fluid system and a specific seal design to lock the clutch in the engaged position when the friction ring wears down to a predetermined thickness, ensuring continuous operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the friction ring is allowed to wear down to minimize wear on other components, then wear on the friction ring increases, but the clutch may disengage when wear exceeds a threshold
Solution Approach 1:
The clutch device monitors its own friction ring wear condition and automatically responds by preventing disengagement when wear exceeds the threshold, eliminating the need for external monitoring or manual intervention
Solution Approach 2:
The wear sensor provides feedback about the friction ring thickness to the control system, which then adjusts the clutch engagement state accordingly, creating a closed-loop control system that responds to wear conditions
2Reliability
If conventional fan clutch devices are used without an auto-stop mechanism, then the device structure remains simple, but the clutch becomes inoperable when the friction ring wears below threshold thickness
Solution Approach 1:
The patent replaces purely mechanical wear tolerance mechanisms with an automated control system that uses sensing and actuation to maintain clutch operation, substituting mechanical simplicity with controlled complexity
Solution Approach 2:
The control system acts as an intermediary between the wear sensor and the clutch actuator, translating wear condition information into appropriate clutch engagement commands
3Productivity
If manual intervention is required to install come home bolts when the friction ring wears down, then the system remains simple, but loss of time occurs when locating and installing the bolts
Solution Approach 1:
The system takes preliminary action by automatically preventing clutch disengagement before the wear becomes critical, maintaining operational continuity without requiring later corrective action
Solution Approach 2:
The clutch system serves itself by automatically monitoring and responding to wear conditions, eliminating the need for driver intervention to locate and install come home bolts
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 auto-stop seal mechanism automatically prevents disengagement of the clutch when the friction ring wears excessively, maintaining fan blade rotation and preventing engine overheating, thus enhancing vehicle reliability and reducing the need for manual intervention.
Implementation Method 1
A fluid channel may allow a pressurized fluid such as hydraulic oil or air supplied to the coupling end to flow from the coupling end, through the fluid channel, and out a fluid passage located toward the front end of the central shaft
Implementation Method 2
An auto-stop seal can prevent a friction interface of the clutch device from disengaging when a friction ring of the friction interface has worn down below a threshold thickness
Data Source
AI summary
A clutch device for a clutch system has a nose cap and a piston that is movable in an axial direction with respect to the nose cap. A seal disposed in the axial direction between the nose cap and the piston automatically locks the clutch device when a threshold amount of wear has accrued in a friction interface of the clutch device. If the seal is not compressed in the axial direction, then a pressurized fluid can flow past the seal and the piston is displaced in the axial direction away from the nose cap. If the seal is compressed in the axial direction, then the pressurized fluid does not flow past the seal and the piston is not displaced in the axial direction away from the nose cap.