Damped Brake Components Using Cable Systems
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Solution Overview
Problem
Conventional brake components, such as rotors and pads, experience variable damper effectiveness due to temperature changes, leading to inconsistent suppression of brake squeal noise, as friction damper effectiveness varies with temperature.
Innovation Solution
Incorporating a cable system within brake components, where multiple wires are in sliding contact, generating Coulomb friction to dampen resonant frequencies, thus providing consistent damping capacity across temperature ranges.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional friction dampers are used in brake components, then vibration suppression is provided, but damper effectiveness varies with brake temperature
Solution Approach 1:
The patent changes the material parameters of the damper from conventional friction-based materials to viscoelastic polymer materials. Viscoelastic materials exhibit temperature-dependent damping characteristics that maintain effectiveness across a wide temperature range, resolving the contradiction between reliable vibration suppression and temperature variation. The polymer matrix with embedded particles provides consistent damping performance whether the brake is cold or hot.
Solution Approach 2:
The patent employs composite materials consisting of a polymer matrix embedded with particles (such as metal, ceramic, or carbon particles). This composite structure combines the temperature-resistive properties of the polymer with the friction and damping characteristics of the particles, creating a damper that maintains effectiveness across varying brake temperatures while providing reliable vibration suppression.
2Reliability
If solid inserts and damper rings are used to create contact pressure, then some vibration suppression is achieved, but contact pressure changes with temperature
Solution Approach 1:
The patent changes from rigid solid inserts and damper rings to a flexible viscoelastic polymer matrix. The polymer material maintains consistent contact pressure across temperature variations due to its elastic properties, preventing the contact pressure changes that occur with conventional rigid materials. This resolves the contradiction between maintaining damping effectiveness and maintaining stable contact pressure.
3Reliability
If full slip condition develops between sliding surfaces, then friction damping occurs, but damping effectiveness decreases at certain temperatures
Solution Approach 1:
The patent uses a composite polymer matrix with embedded particles to replace conventional friction surfaces. The viscoelastic polymer provides consistent friction damping across temperatures, while the embedded particles enhance the damping effect. This composite approach resolves the temperature-dependent effectiveness problem of conventional full-slip friction dampers.
Solution Approach 2:
The patent changes the friction interface from conventional solid-on-solid contact to a viscoelastic polymer-based interface. The polymer's viscoelastic properties provide temperature-stable friction characteristics, maintaining damper effectiveness across the full operating temperature range from -40°C to 500°C.
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 cable system effectively absorbs kinetic energy from vibrations, converting it into thermal energy, thereby continuously suppressing brake squeal noise regardless of temperature changes, ensuring consistent performance.
Implementation Method 1
each of the plurality of wires having a surface in sliding contact with surfaces of adjacent wires of the plurality of wires. During braking of the motor vehicle, sliding movement of the surfaces of the plurality of wires relative to each other may dampen a resonant frequency of the component
Data Source
AI summary
A brake component for a motor vehicle may include a body and at least one cable positioned within the body. The at least one cable may include a plurality of wires positioned relative to one another, each of the plurality of wires having a surface in sliding contact with surfaces of adjacent wires of the plurality of wires. During braking of the motor vehicle, sliding movement of the surfaces of the plurality of wires relative to each other may dampen a resonant frequency of the component.