Magnetorheological Fluid Clutch With Anti-Sedimentation and High Torque
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Solution Overview
Problem
Magnetorheological fluid clutches face issues with sedimentation of magnetic particles and limited torque transmission due to restricted magnetic field size, affecting stability and torque capacity.
Innovation Solution
The design incorporates blades on the input disc to mix settled fluid, combines permanent and electromagnets to enhance the magnetic field, and uses torque sensors to adjust the magnetic field and working mode for improved stability and torque transmission, including a shearing-extruding mechanism for high-torque conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Force
If magnetorheological fluid is used to transmit power, then torque transmission capability is improved, but magnetic particles settle over time affecting stability
Solution Approach 1:
The patent introduces a vibration mechanism that generates radial vibration of the input disc, causing the magnetorheological fluid to vibrate and preventing magnetic particles from settling. This vibration approach maintains fluid homogeneity and stability during operation while preserving torque transmission capability through controlled yield stress changes.
2Ease of operation
If electromagnets are used to generate magnetic field, then torque control is improved, but maximum transmission torque is limited due to restricted magnetic field size
Solution Approach 1:
The patent combines permanent magnets and electromagnets to work together in generating the magnetic field. The permanent magnets provide a strong base magnetic field to achieve high torque transmission, while the electromagnets enable adjustable torque control by modifying the magnetic field strength. This merged approach overcomes the limitation of electromagnets alone and achieves both high torque and controllability.
3Power
If traditional mechanical clutch with friction plates is used, then power transmission is achieved, but abrasion between friction plates causes short service life
Solution Approach 1:
The patent replaces the traditional mechanical friction-based power transmission system with a magnetorheological fluid-based system. Instead of relying on friction between sliding plates, the invention uses controllable yield stress changes in the magnetorheological fluid to transmit torque, eliminating relative sliding and abrasion, thereby significantly extending service life while maintaining power transmission 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
This approach prevents sedimentation, increases torque transmission range, and provides accurate torque detection and adjustment, enhancing the stability and performance of the magnetorheological fluid clutch.
Implementation Method 1
When an external excitation magnetic field is applied, the rigidity and the viscosity of the magnetorheological fluid are rapidly improved within millisecond-level time, so that the increase of the rigidity and the viscosity is in positive correlation with the external excitation magnetic field
Implementation Method 2
a first electric push rod is fixed in the left shell, a push rod of the first electric push rod is connected with a first permanent magnet, and a first electromagnet is fixed to the left shell through an electromagnet support
Data Source
AI summary
The present disclosure is a high-stability and large-torque magnetorheological fluid clutch. Firstly, in order to prevent sedimentation of the magnetorheological fluid, blades are installed on the disc body of an input disc. When the clutch operates in a power interruption mode, the blades can stir the magnetorheological fluid, so that the sedimented magnetorheological fluid is uniformly mixed. Secondly, in order to improve the maximum transmission torque of the magnetorheological fluid clutch, an excitation magnetic field is increased in a mode that a permanent magnet and an electromagnet are connected in series. Meanwhile, a third electric push rod is used for pushing the input disc, and the magnetorheological fluid works in a shearing-extruding working mode, so that the yield stress of the magnetorheological fluid is improved. Therefore, the maximum transmission torque of the magnetorheological fluid clutch is improved.