Wheel Brake Block Ventilation Structure for Even Friction
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Solution Overview
Problem
Railway wheel brakes face issues with uneven friction between the block and wheel surface, leading to vibrations and thermal stresses, and overheating during braking, which can compromise safety and increase noise.
Innovation Solution
A block for wheel brakes featuring a friction portion with a support plate and base plate separated by elastic Belleville washers, creating a ventilation air space for heat dissipation and allowing the block to adapt to irregular wheel surfaces for consistent friction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If a rigid block structure is used for wheel brakes, then the manufacturing precision and structural stability are improved, but the adaptability to irregular wheel surfaces deteriorates, causing uneven friction and vibrations
Solution Approach 1:
The block incorporates elastic elements (Belleville washers) that enable dynamic adaptation to the wheel surface. These elements allow the friction portion to move relative to the base plate, automatically compensating for surface irregularities and maintaining even friction contact without requiring complex active control systems.
Solution Approach 2:
The elastic elements change the positional parameter of the friction portion relative to the base plate based on the wheel surface conditions. This passive parameter adjustment allows the block to adapt to varying wheel geometries and surface irregularities, resolving the contradiction between structural stability and adaptability.
2Power
If direct friction contact is maintained between block and wheel, then the braking effectiveness is improved, but thermal stress and overheating worsen, compromising safety
Solution Approach 1:
The block is segmented into distinct functional portions: a friction portion that contacts the wheel and a base plate that remains cooler. The elastic elements create thermal separation between these portions, allowing the friction portion to perform its braking function while the base plate acts as a thermal buffer, reducing overall thermal stress.
Solution Approach 2:
The elastic elements act as thermal intermediaries between the friction portion and base plate. They transmit mechanical forces while providing thermal isolation, allowing heat to dissipate rather than accumulating in the base plate, thus reducing thermal stress while maintaining braking effectiveness.
3Area of moving object
If the friction surface is enlarged to improve contact, then the friction effectiveness is improved, but the contact pressure distribution worsens, leading to uneven wear and vibrations
Solution Approach 1:
The elastic elements enable the friction portion to dynamically adjust its position and orientation relative to the wheel surface. This dynamic adjustment ensures that the enlarged friction surface maintains uniform contact pressure distribution even when wheel surface irregularities occur, preventing uneven wear and vibrations.
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 ensures continuous, even friction reducing vibrations and thermal stresses, while improving heat dissipation and extending the life of the block and wheel, enhancing safety and noise reduction in urban environments.
Implementation Method 1
said elastic element creating a ventilation air space between said support plate and said base plate
Implementation Method 2
improving heat dissipation
Implementation Method 3
said elastic element creating a ventilation air space between said support plate and said base plate
Implementation Method 4
a friction portion, in which a friction surface is defined, which is arranged so as to act upon a peripheral surface of a wheel in order to carry out the braking action
Data Source
Figure 1~4
Figure 3~5
AI summary
A block (1) for wheel brakes comprising (i) a friction portion (2), in which a friction surface (5) is defined, which, in use, acts upon a peripheral surface of a wheel in order to carry out the braking action, (ii) a support plate (3), which is fixed, in an irreversible manner, to a surface (6) of the friction portion (2) opposite the friction surface (5), and (iii) a base plate (4), which is fixed to the support plate (3) and comprises a coupling element (4a) to fix the block (1) as a whole to a brake system. The block (1) comprises at least one elastic element (12) placed between the support plate (3) and the base plate (4). The presence of the elastic element (12) creates a ventilation air space (I) between the support plate (3) and the base plate (4).