Brake Pad Back Plate Geometry for Squeal Noise Reduction
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Solution Overview
Problem
Existing brake pad solutions for disk brake systems often fail to consistently suppress squeal noises across various braking conditions and temperatures, with noise generation increasing due to inhomogeneous wear of the friction material.
Innovation Solution
A brake pad design featuring a back plate with a reduced thickness in the pressure region, which ensures a constant and homogeneous pressure distribution, reducing noise and improving braking performance by maintaining uniform compressibility and wear patterns.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the back plate has uniform thickness, then the structure is simple and manufacturing is easy, but the pressure distribution is inhomogeneous causing squeal noise
Solution Approach 1:
The back plate is designed with non-uniform thickness, featuring a reduced thickness region in the pressure area compared to the non-pressure area. This local variation in geometric property optimizes the pressure distribution and compressibility characteristics specifically in the contact region, thereby reducing squeal noise while maintaining overall structural integrity and manufacturing feasibility.
2Object-affected harmful factors
If additional noise reduction measures (shims, masses) are added, then squeal noise is suppressed, but the device complexity and cost increase
Solution Approach 1:
The patent extracts and eliminates the need for additional noise reduction components such as shims and massive bodies by integrating the noise suppression function directly into the back plate's geometric design. The non-uniform thickness distribution of the back plate itself provides the necessary pressure and force flow characteristics to suppress squeal noise, thereby simplifying the overall brake pad structure and reducing component count.
3Object-affected harmful factors
If the friction layer is highly compressible for soft contact, then noise dissipation improves, but pressure distribution becomes inhomogeneous
Solution Approach 1:
The back plate's reduced thickness in the pressure region compensates for the high compressibility of the friction layer by pre-positioning the rigid support closer to the contact surface in this area. This local geometric modification ensures that even as the friction layer compresses, the pressure distribution remains more uniform across the contact area, maintaining both noise dissipation and pressure uniformity.
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 squeal noise generation across a wide range of frequencies and temperatures, enhancing braking performance and wear homogeneity without the need for additional noise reduction measures like shims or additional masses.
Implementation Method 1
a distribution of the braking pressure will be more constant in the contact area between the disk and the friction layer
Implementation Method 2
a sufficient compressibility of the friction material may be used to ensure a soft contact and additional noise dissipation
Implementation Method 3
constant values for static and dynamic compressibility may be achieved for a variety of shapes of back plates and friction materials
Implementation Method 4
improving the dynamic properties of the brake pad and its back plate and friction layer has the advantage that noise properties are improved in the region that is highly important for noise transmission
Data Source
AI summary
The application relates to a brake pad for a disk brake system and to a disk brake system. The proposed brake pad comprises a back plate having a front side for facing a brake disk of the disk brake system. The brake pad further comprises a friction layer arranged on the front side of the back plate for contacting a friction surface of the brake disk. Further, the brake pad comprises a pressure region that is configured to be pushed on by a brake piston or by a caliper finger of the disk brake system. The back plate and the friction layer each extend into the pressure region. The back plate has a reduced thickness in the pressure region as compared with a region of the brake pad that is not configured to be pushed on by the brake piston or caliper finger.