Magnetorheological Piston Ring Surface Grooves for Wear Reduction
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Solution Overview
Problem
Conventional magnetorheological (MR) piston dampers experience excessive wear on sliding metal surfaces due to high side loads, which affects their performance and durability.
Innovation Solution
The introduction of surface grooves on the MR piston ring that are lubricated with MR fluid, reducing wear and enhancing the damper's performance under high side loads by providing a controlled lubrication mechanism.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If metal piston ring sliding surfaces are used to engage with the cylinder, then structural strength and durability are improved, but excessive wear occurs under high side loads
Solution Approach 1:
The patent introduces surface grooves that channel MR fluid to the sliding interface between the piston ring and cylinder. The MR fluid acts as an intermediary lubricant layer, reducing direct metal-to-metal contact and wear while maintaining the structural integrity of the metal components.
Solution Approach 2:
The patent utilizes the magnetorheological fluid's ability to change its viscosity and lubrication properties in response to magnetic fields. By varying the magnetic field strength, the lubrication parameters at the sliding interface can be dynamically adjusted to optimize wear protection under different operating conditions.
2Force
If high side loads are applied to the MR damper, then damping force is improved, but wear on sliding surfaces increases
Solution Approach 1:
The MR fluid delivered through surface grooves serves as a mediator that protects the sliding surfaces from the harmful effects of high side loads. The fluid layer distributes and reduces the contact stress, allowing high damping forces to be achieved without proportional increases in wear.
Solution Approach 2:
The patent converts the harmful effect of high side loads into a beneficial opportunity by using the increased pressure to enhance MR fluid delivery through the surface grooves. The high loads that would normally cause excessive wear instead drive more lubricant to the interface, reducing wear while maintaining the high damping force.
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 lubrication of the MR piston ring's surface grooves significantly reduces wear on the sliding surfaces and prevents undesirable breakdown of the MR fluid, thereby improving the damper's operational reliability and longevity.
Implementation Method 1
the surface portion is lubricated by MR fluid in the at-least-one surface groove of the surface portion
Implementation Method 2
Exposing the MR fluid in the MR passageway to a varying magnetic field, generated by providing a varying electric current to an electric coil of the MR piston
Implementation Method 3
varies the damping effect of the MR fluid in the MR passageway providing variably-controlled damping
Data Source
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AI summary
A magnetorheological (MR) piston ring (20) includes an MR-piston-ring body disposable within a cylinder (18) of an MR damper (10). The MR-piston-ring body has a radially inner surface defining a boundary of a longitudinally-extending MR passageway (28). The MR-piston-ring body includes a surface portion (30) which is slidingly engagable with the cylinder (18) and which has first and second longitudinal ends (24 and 26). The surface portion (30) includes at least one surface groove (32) each defining a secondary MR passageway and extending from the first (24) to the second (26) longitudinal end or each defining an MR cavity extending from one of the first and second longitudinal ends toward, but not to, the other of the first and second longitudinal ends. An MR damper (10) including the MR piston ring (20) is also described.