Magnetorheological Vibration Damper with Instant Spring Constant Adjustment
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Solution Overview
Problem
Conventional vibration dampers lack a structure capable of instantly increasing the spring constant to respond to emergency braking and improve driving stability, and existing solutions face issues with sealing properties and the range of spring constant adjustment.
Innovation Solution
A vibration damper with a magnetism responsive fluid, a deformable secondary liquid chamber, and a coil around the orifice, controlled by a unit that activates the coil to magnetize the fluid, allowing for rapid changes in spring constant and improved sealing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If conventional liquid is used in the vibration damper, then the structure is simple, but the spring constant cannot be changed instantly
Solution Approach 1:
The patent applies parameter changes by using magnetism-responsive fluid instead of conventional liquid. The fluid's viscosity and spring constant can be dynamically changed by applying magnetic fields through coils, allowing the vibration damper to adjust its characteristics instantly while maintaining a relatively simple overall structure.
Solution Approach 2:
The patent replaces the mechanical adjustment mechanism with a magnetic field-based system. Instead of mechanically changing the spring constant through moving parts, the invention uses electromagnetic coils to generate magnetic fields that directly alter the properties of the magnetism-responsive fluid, enabling non-mechanical adjustment of the spring constant.
2Speed
If magnetism responsive fluid is used to instantly increase spring constant, then the spring constant can be changed rapidly, but sealing properties deteriorate due to fluid leakage
Solution Approach 1:
The patent introduces a yoke forming member as an intermediary component between the coils and the magnetism-responsive fluid. This yoke structure concentrates and directs the magnetic field effectively through the fluid while providing a sealed containment structure that prevents fluid leakage, thus maintaining both rapid response capability and reliable sealing.
Solution Approach 2:
The patent employs composite material strategies by combining magnetism-responsive fluid with a yoke forming member structure. The yoke member acts as both a magnetic flux conductor and a sealing barrier, creating a composite system that leverages the rapid response of the magnetism-responsive fluid while preventing its leakage through the structured yoke containment.
3Object-generated harmful factors
If the communication passage is narrow, then the vibration damping effect is enhanced, but the spring constant cannot be changed in the required range
Solution Approach 1:
The patent applies dynamics by making the orifice characteristics variable rather than fixed. The magnetism-responsive fluid allows the effective opening and flow characteristics of the orifice to change dynamically based on magnetic field application, enabling the system to maintain narrow passage damping effects when needed while allowing broader spring constant adjustment through magnetic control of the fluid properties.
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 vibration damper effectively absorbs vibrations by changing the spring constant instantly, enhancing driving stability and sealing properties, enabling better response to emergency braking scenarios.
Implementation Method 1
a magnetism responsive fluid filled in a pressure-receiving liquid chamber, at least a portion of an inner wall of the pressure-receiving liquid chamber being formed of the elastic body; a coil provided around the orifice, for magnetizing the magnetism responsive fluid inside the orifice when the coil is electrically activated
Implementation Method 2
an elastic body provided between the first mounting member and the second mounting member to connect the first mounting member and the second mounting member in an elastically deformable manner
Implementation Method 3
viscosity resistance of the liquid flowing through the orifice which communicates between the pressure-receiving liquid chamber and the secondary liquid chamber
Data Source
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AI summary
An object of the present invention is to obtain a vibration damper capable of instantly changing or rapidly increasing the spring constant of the vibration damper, with improving sealing properties. An intermediate cylinder 16 is fittingly engaged with the inner peripheral surface of an outer cylindrical metal member 12. The intermediate cylinder 16 and a mounting metal member 22 are elastically connected by a rubber elastic body 24. A circular tube portion 36A of a yoke forming member 36 is provided at a position on the inner peripheral side of the intermediate cylinder 16. A coil 46 is disposed between the intermediate cylinder 16 and the yoke forming member 36. A pressure receiving liquid chamber 40 in which a portion of an inner wall thereof is formed of the rubber elastic body 24 communicates via an orifice 44 with a secondary liquid chamber 42 which is elastically deformable due to presence of a diaphragm 38, such that a magnetism responsive fluid can flow in either direction between the pressure receiving liquid chamber and the second liquid chamber. A yoke portion 36C is provided on the inner peripheral side of the circular tube portion 36A such that the yoke portion 36C is situated along magnetic path which is generated upon electrical activation of the coil 46.