Magnetorheological Rotary Damper Without Shear-Gap Preloading
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing rotary dampers require high mechanical and electrical complexity to achieve high damping forces, especially for high torques, and often involve cylindrical shear gaps that are inefficient and require preloading.
Innovation Solution
A rotary damper design featuring a hollow shaft, coupling rod, and displacer apparatus with magnetorheological fluid, where the axial movement of the coupling rod is converted into rotational movement through transmission units, and a magnetic field is used to dampen rotational movement by displacing the fluid locally, eliminating the need for shear gaps and preloading.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Force
If a thin shear gap with magnetorheological fluid is used to damp high forces or torques, then damping effectiveness is improved, but mechanical and electrical complexity increases significantly
Solution Approach 1:
The patent replaces the complex mechanical shear gap system with a magnetic field-based displacer apparatus. Instead of relying on mechanical shear forces in a thin gap, the invention uses a magnetorheological fluid coupled with a magnetic field source to generate damping forces through magnetic particle alignment and fluid displacement, thereby reducing mechanical complexity while maintaining high damping capability
Solution Approach 2:
The invention changes the operating parameters by using a magnetorheological fluid whose viscosity and flow characteristics can be dynamically controlled through magnetic field strength. This allows the damping force to be adjusted by changing magnetic field parameters rather than mechanical dimensions, reducing the need for complex mechanical adjustments and simplifying the overall system design
2Force
If a cylindrical shear gap configuration is used, then damping action is achieved, but preloading is required and design complexity increases
Solution Approach 1:
The patent extracts and eliminates the preloading requirement from the shear gap system. By using a displacer apparatus that actively pumps and circulates the magnetorheological fluid through magnetic field control, the system generates damping forces without requiring static preloading mechanisms, thereby simplifying manufacturing and reducing design complexity
Solution Approach 2:
The displacer apparatus with magnetorheological fluid creates a self-regulating system where the fluid automatically circulates and provides damping action based on the applied magnetic field, eliminating the need for external preloading mechanisms and reducing design complexity
3Force
If high damping forces are generated using conventional shear gap methods, then damping performance is improved, but device weight and installation space increase
Solution Approach 1:
The invention changes the physical state and properties of the working fluid by using magnetorheological fluid that can transition from a free-flowing liquid to a semi-solid state under magnetic field influence. This allows high damping forces to be generated with a compact, lightweight fluid-based system rather than heavy mechanical components
Solution Approach 2:
The patent uses magnetorheological fluid, which is a composite material containing magnetic particles suspended in a carrier fluid. This composite material provides high damping capability per unit weight, allowing the generation of high damping forces with reduced overall device weight and installation space
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 design allows for efficient generation of high damping forces with reduced complexity, weight, and cost, enabling flexible adjustment of braking torque and smooth operation in both rotational directions, suitable for large forces and moments, while maintaining low installation space and weight.
Implementation Method 1
The displacer apparatus (2) contains (at least) a magnetorheological fluid (6) as the working fluid and can thus be operated. The magnetic field source (8) is suitable and formed for a magnetic field to (at least partially) act upon the displacer components (4, 5)
Implementation Method 2
The magnetic field source (8) is suitable and formed for a magnetic field to (at least partially) act upon the displacer components (4, 5) which engage in one another and are rotatable relative to one another and the damper shaft (3) in order to damp a rotational movement of the damper shaft (3)
Data Source
AI summary
A rotation damper has a housing, a magnetic field source and a damper shaft designed as a hollow shaft, and a coupling rod arranged inside the damper shaft. The hollow shaft and the coupling rod form interacting transmission units and convert a relative axial movement of the coupling rod into a rotational movement of the hollow shaft. A displacer unit is arranged in the housing. The displacer unit includes the damper shaft and meshing displacer components that are rotatable in relation to each other. The displacer unit contains a magnetorheological fluid as the working fluid and can be operated thereby. The magnetic field source is configured for applying a magnetic field to the displacer components in order to dampen a rotational movement of the damper shaft.