Disc Brake Rotor Damping Ring for Noise Control Without External Wear
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Solution Overview
Problem
Conventional brake rotor designs with friction dampers around the periphery suffer from wear-induced performance degradation and noise issues due to direct contact, leading to premature part replacement and reduced friction effectiveness over time.
Innovation Solution
A sealed tube system with a damping ring containing wire strands and dampening particles is used to dissipate vibrations internally, containing wear debris and maintaining frictional dissipation efficiency without external wear, thus reducing noise and extending component life.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If friction dampers are provided around the periphery of the brake rotor to reduce noise, then noise reduction is achieved, but wear on the rotor periphery and dampers occurs over time
Solution Approach 1:
The friction damper is segmented into multiple components: a damping ring with groove, multiple cables with wires, and dampening particles. This segmentation allows the friction interface to be distributed across multiple elements (wires and particles) rather than a single continuous surface, reducing wear on the rotor periphery while maintaining noise damping effectiveness
Solution Approach 2:
Dampening particles are introduced as intermediary elements between the cables and the rotor periphery. These particles mediate the friction interaction, allowing the cables to contact the rotor through the particles rather than directly, which reduces wear on both the rotor and dampers while maintaining friction-based noise reduction
2Object-affected harmful factors
If direct friction contact is used between dampers and rotor periphery to create friction damping, then noise is reduced, but performance diminishes over time due to wear
Solution Approach 1:
The friction interface parameters are changed from direct solid-to-solid contact to a multi-element system involving cables, wires, and dampening particles. This parameter change transforms the friction mechanism to distribute wear across multiple elements, extending the service life while maintaining noise reduction performance
Solution Approach 2:
The friction damper uses a composite structure combining metallic cables/wires with dampening particles (which may be polymeric, ceramic, or composite materials). This composite approach allows different materials to contribute different properties: the cables provide structural integrity while the particles provide friction damping with reduced wear
3Object-affected harmful factors
If friction dampers are used to reduce noise, then initial noise performance is improved, but part replacement is necessitated prematurely
Solution Approach 1:
The dampening particles and cable system are designed to self-adjust and maintain friction contact over time. The particles can redistribute and reconfigure to maintain effective friction interfaces, allowing the damper to maintain noise reduction performance without requiring premature replacement
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 reduces noise and maintains frictional damping efficiency by containing wear within the sealed tube, preventing external wear and corrosion, and eliminating the need for premature part replacement.
Implementation Method 1
a cable including a plurality of wires that each have a surface in sliding contact with surfaces of adjacent wires of the plurality of wires
Implementation Method 2
a plurality of dampening particles disposed in the tube portion in contact with the cable and the inner surface
Data Source
AI summary
A disc brake rotor for a motor vehicle may include a substantially disc shaped body portion, a groove formed in a peripheral edge of the body portion, and a damping ring disposed in the groove. The damping ring may include a tube portion having an inner surface and an outer surface that is in what in some cases may be stationary contact with the groove, a cable including a plurality of wires that each have a surface in sliding contact with surfaces of adjacent wires of the plurality of wires with the at least one cable being disposed in the tube portion to contact the inner surface, and a plurality of dampening particles disposed in the tube portion in contact with the cable and the inner surface.