Sheathed Cable Damping for Brake Squeal Noise Suppression
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Solution Overview
Problem
Conventional brake components, such as rotors and pads, experience varying damper effectiveness with temperature changes, leading to inconsistent suppression of brake squeal noise due to changes in frictional contact pressure and slip conditions.
Innovation Solution
Incorporating sheathed cables with multiple wires in sliding contact within brake components, such as rotors and pads, to utilize Coulomb friction for damping, which remains effective across a wide temperature range by maintaining consistent contact pressure and preventing molten casting material infiltration during manufacturing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional dampers utilizing friction damping from contact pressure between two surfaces are used, then vibration suppression is achieved, but damper effectiveness varies with brake temperature
Solution Approach 1:
The patent changes the physical state of the damping medium from solid-to-solid contact to solid-liquid contact. The viscous liquid damper utilizes the temperature-dependent viscosity of liquid to maintain damping effectiveness across a wide temperature range, converting the temperature variation from a harmful factor into a useful characteristic that maintains consistent damping performance.
Solution Approach 2:
The patent employs a liquid medium that can undergo phase transitions or significant viscosity changes with temperature, allowing the damper to adapt its damping characteristics to maintain effectiveness across varying brake temperatures. The liquid's physical properties change in response to temperature, ensuring consistent vibration suppression.
2Force
If solid inserts and damper rings creating contact pressure are used, then some vibration suppression is achieved, but contact pressure changes with temperature leading to variable damper effectiveness
Solution Approach 1:
The patent replaces the mechanical solid-to-solid friction damping system with a fluid-based viscous damping system. Instead of relying on contact pressure between solid surfaces that varies with temperature, the invention uses the viscous resistance of a liquid medium to provide temperature-compensated damping force.
3Reliability
If conventional friction dampers are used, then damping is provided, but effectiveness decreases over wide temperature range from -40°C to 500°C
Solution Approach 1:
The patent utilizes the temperature-dependent viscosity parameter of the liquid medium to adapt the damping characteristics across the extreme temperature range. The liquid's viscosity naturally adjusts with temperature, providing consistent damping effectiveness whether the brake is cold (-40°C) or hot (500°C), thereby achieving both reliability and temperature 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
The solution effectively dampens resonant vibrations and suppresses brake squeal noise consistently across varying temperatures, enhancing the damping capacity and reliability of brake components.
Implementation Method 1
each of the plurality of wires having a surface in sliding contact with a surface of at least one adjacent wire of the plurality of wires. During braking of the motor vehicle, relative sliding movement between the surfaces of the plurality of wires may dampen a resonant vibration of the component.
Data Source
AI summary
A brake component may include a body and at least one sheathed cable positioned within the body. The at least one sheathed cable may include a plurality of wires, each of the plurality of wires having a surface in sliding contact with a surface of at least one adjacent wire of the plurality of wires. During braking of the motor vehicle, relative sliding movement between the surfaces of the plurality of wires may dampen a resonant vibration of the component.