Mini Magnetorheological Damper Layout for Compact Damping Control
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Solution Overview
Problem
Adjusting damping and spring characteristics in shock absorbers for bicycles is complex, especially for beginners, leading to suboptimal riding performance in varying terrain and rider conditions.
Innovation Solution
A magneto rheological damper with a compact design, reduced length, and easy assembly, featuring a magnetic field generator separate from the piston, a coil spring, and a compensation chamber for improved damping and spring support, allowing for adjustable viscosity of the working fluid.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the magnetic field generator is integrated with the piston, then the damping control is more direct, but the device complexity and length increase
Solution Approach 1:
The magnetic field generator is separated from the piston and placed in the end cap, dividing the damping control function into independent components. This segmentation reduces structural complexity while maintaining control effectiveness through the magnetic field's action on the working fluid.
Solution Approach 2:
The magnetic field generator operates in a different spatial location (end cap rather than piston) but achieves the same damping control function through the magnetic field's penetration through the working fluid, demonstrating functional equivalence through spatial repositioning.
2Length of moving object
If the damper length is reduced for compact design, then the integration is easier, but the compensation chamber space is limited
Solution Approach 1:
The compensation chamber is nested within the extension portion of the housing, utilizing the radial space outward from the main cylindrical housing. This nesting approach provides additional compensation volume without increasing the overall axial length of the damper.
Solution Approach 2:
The compensation chamber is positioned radially outward through the extension portion rather than axially along the center line, utilizing a different spatial dimension to accommodate the required volume while maintaining a compact axial length.
3Adaptability or versatility
If multiple adjustment parameters are provided for optimal damping, then the adaptability is improved, but the ease of operation decreases
Solution Approach 1:
The magnetic field generator enables continuous adjustment of damping characteristics by varying the magnetic field strength, which directly changes the viscosity of the magneto-rheological working fluid. This provides adaptability through parameter change rather than discrete mechanical adjustments.
Solution Approach 2:
Traditional mechanical adjustment mechanisms are replaced with a magnetic field-based control system that adjusts damping by changing the magnetic properties of the working fluid, simplifying the operation while maintaining adaptability.
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
Enhances riding performance by providing customizable damping and spring support, reducing the complexity and cost of manufacturing while allowing for easier maintenance and integration into smaller applications like mountain bikes and electric scooters.
Implementation Method 1
A magnetic field generator is located in the compression chamber and in an abutment relationship with the end cap for generating a magnetic field to change the viscosity of the working fluid
Implementation Method 2
A coil spring is located in the compression chamber and extending helically along the center axis between the piston and the end cap for providing a spring force during the compression stroke
Data Source
Figure 1
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AI summary
A magneto rheological damper (20) includes a housing (22) extending between a first opened end (24) and a second opened end (26) and defining a fluid chamber (28, 30) extending therebetween. An end cap (32) is located at the first opened end (26) and coupled to the housing (22). A piston (36) is disposed in the fluid chamber (28, 30) dividing the fluid chamber (28, 30) into a compression chamber (28) and a rebound chamber (30). A piston rod (44) extends along the center axis (A) and attaches to the piston (36) for movement with the piston (36) between a compression and a rebound stroke. A magnetic field generator (56) is located in the compression chamber (28) and in an abutment relationship with the end cap (32). An extension portion (80) protrudes radially outwardly from the housing (22) and defining a compensation chamber (86) and a channel (90). The channel (90) is in fluid communication with the compression chamber (28) and the compensation chamber (86) for allowing the working fluid to flow from the compression chamber (28) to the compensation chamber (86).