Railway Brake Lining Support and Sintered Material for Squeal Reduction
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Solution Overview
Problem
Current methods for reducing brake squeal in railway disc brake systems, such as controlling support stiffness, imparting damping, and stabilizing friction coefficients, are not comprehensive and may not effectively address the issue across all disc brake types and high-speed conditions.
Innovation Solution
A brake lining with a sintered friction material having a Young's modulus of 35.0 GPa or more, combined with a friction material supporting mechanism, is used to reduce brake squeal in railway disc brake systems, applicable to both floating-type and opposed-type systems, by enhancing mechanical properties to minimize self-induced vibrations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If a friction material supporting mechanism is included in the brake lining, then the contact area of the friction material with the brake disc is increased and temperature distribution is equalized, but brake squeal is generated due to self-induced vibration
Solution Approach 1:
The patent applies parameter changes by specifying a Young's modulus of 35.0 GPa or more for the sintered friction material. This parameter change in the material's mechanical properties modifies the vibration characteristics of the friction material, thereby reducing brake squeal while maintaining the temperature equalization benefit provided by the friction material supporting mechanism
Solution Approach 2:
The patent uses composite materials by employing sintered friction material with specific compositional characteristics (Young's modulus ≥ 35.0 GPa) in combination with the friction material supporting mechanism. This composite structure achieves both temperature distribution equalization and squeal reduction through the synergistic effect of the supporting mechanism and the optimized friction material properties
2Object-generated harmful factors
If existing methods for reducing brake squeal are applied, then brake squeal is reduced in specific cases, but the solution is not comprehensive and may not effectively address the issue across all disc brake types and high-speed conditions
Solution Approach 1:
The patent achieves universality by providing a comprehensive solution that works across different disc brake types (floating-type and opposed-type) and high-speed conditions. The combination of the friction material supporting mechanism and sintered friction material with Young's modulus of 35.0 GPa or more creates a multi-functional system that simultaneously addresses temperature equalization and squeal reduction in various braking scenarios
Solution Approach 2:
The patent applies parameter changes by specifying a Young's modulus of 35.0 GPa or more for the sintered friction material. This parameter change creates a material property that universally reduces brake squeal across different brake system configurations and operating conditions, making the solution adaptable to various disc brake types and high-speed railway applications
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 brake squeal by decreasing the maximum squeal index to 2.0 or less, even at high coefficients of friction ranging from 0.2 to 0.6, thereby improving braking performance in high-speed railway applications.
Implementation Method 1
the disc brake system for the railway vehicle applies brakes to rotation of the wheel or the axle using a frictional force generated between the brake discs and the brake linings
Implementation Method 2
The friction material supporting mechanism may include, for example, an elastic member that is typically a belleville washer
Implementation Method 3
the brake squeal is caused by self-induced vibration that is created over the entire disc brake system for a railway vehicle due to a frictional force generated between a brake disc and the brake lining
Data Source
AI summary
There is provided a brake lining for a railway vehicle that can reduce brake squeal in braking. A brake lining for a railway vehicle is used for a disc brake system of a railway vehicle. This brake lining includes a base plate, a sintered friction material, and a friction material supporting mechanism. The friction material supporting mechanism is disposed between the base plate and the sintered friction material and supports the sintered friction material in such a manner that the sintered friction material can move with respect to the base plate. The sintered friction material has a Young's modulus of 35.0 GPa or more.