Railway Brake Bushing Seal for Disc Particle Suction
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Solution Overview
Problem
Existing railway disc brake systems fail to effectively prevent air leakage at the interface between the friction shoe and brake head, leading to inefficient suction of particles emitted during braking, which degrades the suctioning process.
Innovation Solution
Incorporating a return mechanism, such as a spring or conical flange, to press the connection bushing against the profile member, ensuring a seal between the connection bushing and the shoe, and consequently between the brake head and the shoe through the duct and through-hole, enhancing the suction efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a connection bushing is mounted in the through-hole to guide particles, then particle suctioning is enabled, but air leakage occurs at the interface between the shoe and brake head
Solution Approach 1:
The return mechanism (spring or conical flange) is pre-installed in the connection bushing to automatically press the bushing against the profile member when the shoe is mounted, creating a seal before particle suctioning begins. This preliminary sealing action prevents air leakage that would otherwise occur at the interface between the shoe and brake head.
Solution Approach 2:
The return mechanism applies a pre-compression force through the spring or conical flange design that counteracts the tendency of the connection bushing to separate from the profile member during operation. This preliminary counter-force maintains continuous contact and sealing, preventing air leakage that would degrade suctioning performance.
2Reliability
If a return mechanism is added to press the connection bushing against the profile member, then sealing is improved, but device complexity increases
Solution Approach 1:
The return mechanism function is merged into the connection bushing structure itself. The conical flange design integrates the sealing action directly into the bushing geometry, while the spring is housed within the bushing assembly. This merging eliminates the need for separate sealing components and reduces overall assembly complexity.
Solution Approach 2:
The conical flange design enables the connection bushing to self-seal against the profile member through its geometric shape, which automatically converts axial movement into radial sealing pressure. The spring provides self-adjusting compression force that maintains sealing without external control systems, allowing the assembly to service itself.
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 prevents air leakage and improves the suctioning of particles by ensuring a tight seal, allowing for more efficient capture of particles emitted during braking without the need for additional parts or complex assembly.
Implementation Method 1
a return mechanism, such as a spring or conical flange, to press the connection bushing against the profile member
Implementation Method 2
a suction device, supplied by a pump, near an area of emission of particles coming from the friction pad of the friction shoe
Data Source
AI summary
Disclosed is a friction assembly for a railway disc brake system, this friction assembly including, on the one hand, a brake head including an upper face with a receiving slide, and a lower face, and on the other hand, shoe of friction material and including a first face which is the friction face, and a second face with a profile member configured to engage with the receiving slide, the shoe including a duct establishing sealed communication between a first space bordered by the first face and a second space bordered by the second face, the friction assembly further including a through-hole of central axis A, provided in the brake head and located in line with the duct, and a connection bushing in the through-hole and forming a connection with the duct. The friction assembly includes a return mechanism capable of pressing the connection bushing against the profile member.