Magnetorheological Brake Component With Axial Volume Compensation
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Solution Overview
Problem
Magnetorheological braking apparatuses face challenges in temperature-related volume changes, leading to increased pressure, seal degradation, and friction due to the need for gas buffers, which complicate the system and reduce performance.
Innovation Solution
The apparatus employs a relative axial displacement of brake components to compensate for volume changes, eliminating the need for additional mechanical components and maintaining ambient pressure, thus reducing seal loading and maintaining system performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a gas buffer is used to compensate for temperature-related volume changes of the magnetorheological medium, then pressure increases are reduced and seal leakage is prevented, but the forces that can be transmitted and the basic function are impaired, and the service life of the seals is reduced
Solution Approach 1:
The patent removes the gas buffer from the system entirely. Instead of using a gas-filled compensation chamber, the invention employs a purely mechanical compensation mechanism where the magnetorheological medium itself compensates for thermal expansion through a defined compensation volume in the closed chamber, eliminating the harmful gas buffer while preserving force transmission capability
Solution Approach 2:
The patent introduces a magnetic field as an intermediary mechanism to control the magnetorheological medium's properties. By using magnetic field-generating apparatus, the system can adjust the medium's viscosity and flow characteristics to accommodate thermal expansion without requiring a gas buffer, thus maintaining force transmission while preventing seal leakage
2Reliability
If a compensation vessel is provided to buffer volume changes and hold magnetorheological medium, then pressure increase is reduced and leakage is prevented, but the apparatus complexity increases and the mechanism is susceptible to faults
Solution Approach 1:
The patent extracts and eliminates the separate compensation vessel from the system. The compensation function is integrated directly into the closed chamber design, where the magnetorheological medium compensates for its own thermal expansion through a predefined compensation volume, removing complex valves, connections, and external vessels that are prone to faults
Solution Approach 2:
The patent merges the compensation function with the main closed chamber structure. The compensation volume is incorporated into the existing chamber design rather than being a separate component, combining the braking function and thermal compensation function into a single integrated system that is simpler and more reliable
3Force
If the closed chamber is completely filled with magnetorheological medium, then maximum force transmission is achieved, but temperature-related volume changes cause high pressure forces on components and seals
Solution Approach 1:
The patent changes the physical parameters of the system by introducing a compensation volume that allows the magnetorheological medium to expand thermally without generating excessive pressure. The medium's effective density and pressure characteristics are adjusted through this compensation mechanism, maintaining force transmission while reducing stress on seals
Solution Approach 2:
The patent provides beforehand cushioning by designing the closed chamber with a predefined compensation volume that anticipates thermal expansion. This compensation space is prepared in advance to accommodate volume changes, preventing high pressure forces from building up on the seals during temperature variations
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 solution allows for cost-effective and low-maintenance temperature compensation, extending the service life of the braking apparatus and preventing pressure increases, while ensuring consistent operation without gas buffers.
Implementation Method 1
In the event of a change in the ambient or operating temperature, the volume of the magnetorheological medium in the closed chamber also changes
Data Source
AI summary
A device component has a magnetorheological braking apparatus with a stationary holder and at least two brake components. One of the two brake components is connected to the holder for conjoint rotation and extends in the axial direction. The two brake components can be rotated relative to each other. The second brake component has a hollow sleeve part and surrounds the first brake component. A closed chamber is formed between the brake components. The second brake component is rotatably accommodated on the first brake component at a first end of the closed chamber. The closed chamber is substantially filled with a magnetorheological medium. A magnetic-field generator forms a magnetic field to influence the medium in the closed chamber. The second brake component is axially slidable on the first brake component to change a volume of the closed chamber to compensate for temperature-related and/or leakage-related volume changes.