Modular Viscous Clutch With Electromagnetic Fluid Flow Control
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Solution Overview
Problem
Existing solutions for controlling motor-driven processes, such as fans and pumps, face challenges with friction clutches due to wear and maintenance costs, and variable speed drives are complex and sensitive to harsh environments, making them unsuitable for all applications.
Innovation Solution
A viscous clutch design with a modular control coil assembly and shear fluid-based torque transfer, allowing input and output on the same side and featuring an electromagnetically actuatable valve for fluid flow control, reducing maintenance and environmental sensitivity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a friction clutch is used to connect or disconnect the motor shaft to the output, then the output can be selectively turned on and off, but substantial wear on the friction material and mating surfaces results in reliability concerns and high maintenance costs
Solution Approach 1:
The patent replaces the mechanical friction-based clutch system with an electromagnetic clutch system. The electromagnetic clutch uses magnetic fields to engage and disengage the connection between motor shaft and output, eliminating physical friction contact. This substitution resolves the contradiction by maintaining selective connection capability while eliminating wear and maintenance issues associated with friction materials.
Solution Approach 2:
The patent changes the fundamental operating parameter from mechanical friction force to electromagnetic force. By using electromagnetic fields instead of friction, the system achieves selective engagement without the wear inherent in friction-based systems. The electromagnetic clutch allows connection and disconnection through electrical control, fundamentally changing how the engagement mechanism operates.
2Ease of operation
If a variable speed drive (VFD) is used to control the torque input provided by the electric motor, then the motor speed can be controlled, but the VFD power electronics are sensitive to heat and moisture making them difficult and expensive to protect in outdoor and harsh operating environments
Solution Approach 1:
The patent extracts the speed control function from the motor itself and relocates it to the load side through the electromagnetic clutch system. Instead of controlling motor speed through vulnerable power electronics, the system allows the motor to run at constant speed while the electromagnetic clutch provides variable torque transmission to the load. This removes the sensitive electronics from harsh environments while maintaining speed control capability.
Solution Approach 2:
The electromagnetic clutch acts as an intermediary between the motor and the load, providing torque control without requiring control of motor speed. The clutch engages and disengages magnetically, serving as a protective barrier that isolates sensitive components from harsh environmental conditions while still enabling controlled power transmission to the load.
3Ease of manufacture
If stationary mounting brackets are used with viscous clutches, then the clutch can be mounted, but the brackets add mass, occupy large amounts of space, and limit mounting locations
Solution Approach 1:
The patent merges the mounting bracket function directly into the clutch housing structure. Instead of using separate stationary mounting brackets, the clutch housing itself is designed with integrated mounting features that allow direct attachment to the motor shaft. This integration eliminates the need for additional brackets, reducing mass and simplifying the overall assembly while maintaining mounting capability.
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 provides a compact, low-maintenance, and efficient means to control torque and speed in motor-driven processes, suitable for various applications without the need for complex electronics or stationary mounting brackets.
Implementation Method 1
a valve that is electromagnetically actuatable to selectively control a flow of the shear fluid
Implementation Method 2
a torque coupling between the input member and the output member can be created as a function of a volume of the shear fluid present in the working chamber
Data Source
Figure 1
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Figure 3
AI summary
A viscous clutch (20) includes an input member (40), an output member (42), a working chamber (44) defined between the input member and the output member, a reservoir (46) to hold a supply of a shear fluid fluidically connected to the working chamber by a fluid circuit, a valve (48) that is electromagnetically actuatable to selectively control a flow of the shear fluid along the fluid circuit, a control coil assembly (28), and a securing mechanism (30). The control coil assembly includes a modular center hub (28-1) removably attached to the input member, an electromagnetic coil (28- 2), and a coil bearing (28-3) rotatably supporting the electromagnetic coil on the modular center hub. The securing mechanism is removably attached to the input member radially inward of the working chamber and the reservoir, and includes a radially outwardly extending flange (30-4).