Grooved Brake Pad Structure for Squeal and Wave Suppression
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Solution Overview
Problem
Braking devices in vehicles experience resonance-induced squeal noise and vibration changes due to brake pad wear, which are not effectively addressed by existing noise reduction methods, leading to unpleasant noise and performance issues.
Innovation Solution
A brake pad design incorporating grooves and a viscoelastic layer to suppress reflected waves and vibrations, with grooves shaped to reduce excitation forces and the viscoelastic layer to dampen vibrations, enhancing noise reduction and cooling efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a brake pad is designed to prevent squeal noise during development testing, then noise reduction is improved, but the lining wears out over time and vibration characteristics change, causing new noise to occur
Solution Approach 1:
The brake pad structure is segmented into multiple functional layers including a back plate, frictional material, and a noise preventing member with specific groove patterns. This segmentation allows each component to address different aspects of noise and vibration independently, ensuring sustained performance over time as wear occurs
Solution Approach 2:
The noise preventing member incorporates grooves with specific curvature radii (R1, R2, R3) and depth parameters that are optimized to change the vibration characteristics of the brake pad. These parameter changes create damping effects that adapt to wear over time, maintaining noise suppression reliability throughout the service life
2Object-affected harmful factors
If the brake pad structure is modified to suppress reflected waves, then noise reduction is improved, but the device complexity increases
Solution Approach 1:
A noise preventing member is introduced as an intermediary component between the back plate and the frictional material. This mediator contains the groove patterns that suppress reflected waves without requiring fundamental changes to the basic brake pad structure, thus limiting complexity increase while achieving noise reduction
Solution Approach 2:
The groove patterns in the noise preventing member utilize curved geometries with specific radius values (R1, R2, R3) to suppress reflected waves. The curvature design allows wave suppression through geometric diffusion rather than complex multi-component structures, balancing effectiveness with structural simplicity
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 design effectively suppresses squeal noise and reflected waves, reducing brake noise and vibration while maintaining performance and cooling efficiency, thereby minimizing development costs and environmental variations.
Implementation Method 1
the back plate may include a viscoelastic layer that is stacked on the second surface of the back plate and that reduces vibration of the back plate
Implementation Method 2
At least one of the frictional material or the back plate includes a groove for suppressing waves generated by the brake pad
Data Source
AI summary
A brake pad includes a back plate to be installed on a brake caliper and defining a base. The brake pad also includes a frictional material stacked at a first surface of the back plate to generate friction with a brake disc. At least one of the frictional material or the back plate includes a groove for suppressing waves generated by the brake pad.