Brake Disc Circumference Features for Vibration and Noise Reduction
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Brake discs in vehicle disc brake assemblies experience vibrations and associated noise emissions due to friction between brake pads and the disc, with existing solutions like adjusting dimensions and orientations of circumferential edges only partially addressing the issue.
Innovation Solution
Incorporating structural features such as projections or recessed portions along the circumference of the brake disc's side surfaces to adjust its vibration characteristics, reduce noise, and decouple vibration modes, without adding significant mass or affecting mechanical stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-generated harmful factors
If structural features (projections or recessed portions) are added to the circumferential surface of the brake disc, then vibration characteristics are adjusted and noise emissions are reduced, but manufacturing complexity increases
Solution Approach 1:
The patent modifies the circumferential surface geometry by adding projections or recessed portions with specific dimensional parameters (height 0.1-5mm, arc length 5-50mm). These parameter changes alter the vibration characteristics and natural frequencies of the brake disc, effectively reducing noise emissions while maintaining manufacturability through conventional machining processes
Solution Approach 2:
The structural features are distributed asymmetrically along the circumferential surface rather than being uniformly spaced. This asymmetric distribution creates specific vibration mode decoupling effects that reduce structural-borne noises across a wide frequency range, while the features themselves can be manufactured using standard machining operations
2Object-generated harmful factors
If structural features are added to adjust vibration characteristics, then noise reduction is achieved, but manufacturing cost increases
Solution Approach 1:
By optimizing the dimensional parameters of the structural features (small height range of 0.1-5mm, moderate arc length of 5-50mm), the patent achieves effective noise reduction while ensuring that the features can be manufactured using conventional machining processes without requiring expensive specialized equipment or multi-step manufacturing sequences
Solution Approach 2:
The structural features are localized to the circumferential surface of the brake disc rather than modifying the entire component. This localized approach allows for targeted vibration control with minimal impact on overall manufacturing complexity and cost, as only specific regions of the disc require additional processing steps
3Object-generated harmful factors
If structural features are added to modify vibration characteristics, then noise reduction is achieved, but mechanical stability is affected
Solution Approach 1:
The patent carefully selects parameter ranges for the structural features (height 0.1-5mm, arc length 5-50mm) that are sufficient to alter vibration characteristics and reduce noise, while remaining small enough to preserve the overall structural integrity and mechanical stability of the brake disc. The features modify local stiffness and mass distribution without compromising global strength
Solution Approach 2:
The structural features are confined to the circumferential surface region and do not penetrate deeply into the brake disc structure. This localized modification allows for vibration characteristic adjustment while maintaining the bulk mechanical properties and structural stability of the disc, as the core load-bearing sections remain unchanged
Data Source
AI summary
The invention concerns a brake disc for a motor vehicle,the brake disc having at least one first friction ring with:a first side surface having a friction surface;a second side surface opposite the first side surface; anda circumferential surface connecting the first side surface and second side surface;wherein the circumferential surface comprises a plurality of structural features distributed in a circumferential direction, each structural feature comprising a projecting portion or a recessed portion.