Rail Brake Lever Assembly With Automatic Slack Adjustment

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Solution Overview

Problem

Existing railway brake systems face challenges with brake shoe wear leading to increased brake throw, resulting in brake delays and requiring manual adjustment of slack adjustors, which necessitates temporary decommissioning of the railway vehicle.

Innovation Solution

A brake assembly with a lever attachment interface pivotally coupled with two degrees of freedom to a joint between a first and second lever, incorporating an automatic slack adjuster in the brake cylinder to adjust the actuation throw as the brake lining wears, thereby reducing manual intervention and brake delays.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If manual slack adjustors are used to decrease wheel-shoe gap, then brake shoe wear is compensated, but vehicle stoppage is required for adjustment

Engineering Contradiction:

Improvebrake performanceVSAvoidmaintenance downtime

Core Design Contradiction:

ReliabilityVSLoss of time

Solution Approach 1:

The brake system incorporates an automatic slack adjustor that self-adjusts the brake shoe position relative to the wheel as the brake lining wears. This eliminates the need for manual intervention and vehicle stoppage, allowing the system to maintain optimal brake performance automatically throughout the service life of the brake lining.

Inventive Principle:

Principle #25Self-service

2Force

If brake shoe lining diminishes over time, then braking force is maintained, but brake throw increases causing delays

Engineering Contradiction:

Improvebraking forceVSAvoidbrake delay

Core Design Contradiction:

ForceVSLoss of time

Solution Approach 1:

The automatic slack adjustor continuously monitors and adjusts the brake shoe position to maintain constant brake throw despite lining wear. This ensures that the braking force transmission remains efficient and delays are minimized throughout the service life of the brake components.

Inventive Principle:

Principle #25Self-service

Solution Approach 2:

The system uses the brake cylinder pushrod movement as feedback to detect lining wear and automatically adjusts the slack adjustor mechanism to compensate for the wear, maintaining optimal brake geometry without external intervention.

Inventive Principle:

Principle #23Feedback

3Device complexity

If lever attachment interface has fixed positioning, then structural simplicity is maintained, but parasitic force components increase

Engineering Contradiction:

Improveinterface structureVSAvoidparasitic force

Core Design Contradiction:

Device complexityVSLoss of energy

Solution Approach 1:

The lever attachment interface incorporates a spherical joint that allows dynamic adaptation of the lever orientation during brake actuation. This dynamic positioning capability enables the lever to align optimally with the force transmission path throughout the stroke, minimizing parasitic force components while adding minimal structural complexity.

Inventive Principle:

Principle #15Dynamics

Data Source

PatentUS12304534B2Brake assembly and method for operation of said assembly

Publication Date: 2025.05.20 TRANSPORTATION IP HOLDINGS LLC

AI summary

Various systems and methods for braking a vehicle are provided. In one embodiment, a brake assembly is provided that includes a lever attachment interface pivotally coupled with two degrees of freedom to a joint between a first lever and a second lever and a brake cylinder coupled to the first lever and designed to engage and disengage a brake lining in a brake component. The brake cylinder includes a slack adjuster configured to adjust a throw of the second lever.