Brake Caliper Linkage Design Eliminates Bending Modes
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Solution Overview
Problem
Disc brake assemblies experience brake squeal due to modal excitations between the disc brake rotor and caliper, primarily caused by bending modes in the caliper bracket linkages, which existing countermeasures like increased stiffness and mass attachment do not fully address.
Innovation Solution
A brake assembly design featuring a U-shaped bracket with tie-bar linkages that transfer tensile loads without supporting bending modes, utilizing rigid links and specific joints to prevent excitation, thereby reducing sound generation during brake application.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If the stiffness of the caliper bracket is increased by increasing the cross-sectional area of the tie-bars, then low-frequency brake squeal is reduced, but the device complexity and weight increase
Solution Approach 1:
The patent changes the fundamental parameter of the linkage from a bending-capable beam structure to a truss-style linkage with pinned joints. This parameter change eliminates bending modes entirely while maintaining the necessary structural function, thereby reducing brake squeal without increasing complexity or weight
Solution Approach 2:
The patent employs a composite structural approach by combining multiple rigid links with pinned joints to create a truss-like assembly. This composite structure achieves the desired vibration characteristics without requiring increased material quantity or complexity
2Object-affected harmful factors
If a mass is cast in or mechanically attached to the caliper bracket to act as a vibration damper, then brake squeal is reduced, but the weight of the brake assembly increases
Solution Approach 1:
The patent extracts the bending capability from the linkage structure by using pinned joints between rigid links. This extraction eliminates the source of bending modes and associated vibration problems without requiring additional mass or dampers, thereby avoiding weight increase
Solution Approach 2:
Instead of adding mass to dampen vibrations, the patent inverts the approach by designing a structure that cannot generate bending vibrations in the first place. The pinned joint linkage prevents bending modes entirely, achieving vibration reduction through structural configuration rather than mass addition
3Object-affected harmful factors
If the cross-sectional area of the tie-bars is increased to reduce brake squeal, then the stiffness and damping increase, but the manufacturing cost and material usage increase
Solution Approach 1:
The patent segments the tie-bar into multiple rigid links connected by pinned joints, creating a truss-style linkage. This segmentation eliminates bending modes while using the same or less material, thereby reducing brake squeal without increasing material usage or manufacturing cost
Solution Approach 2:
The patent changes the structural parameter from a solid beam with bending capability to a pinned-linkage structure without bending modes. This parameter change achieves vibration reduction through geometric configuration rather than material quantity, avoiding increased material usage and cost
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 absence of bending modes in the linkage design effectively reduces brake squeal by eliminating the excitation sources that typically cause noise, resulting in a quieter braking system.
Implementation Method 1
The linkage is configured to transfer tensile loads between the first and second portion
Data Source
AI summary
A brake assembly includes a brake pad, a bracket supporting the brake pad and having a first portion, a second portion spaced apart from the first portion, and a linkage interconnecting the first and second portions. The linkage is configured to transfer tensile loads between the first and second portion, but is characterized by the absence of any bending modes. The absence of bending modes prevents excitation of the linkage, thereby reducing sound generated during application of the brake assembly.