Rail Vehicle Parking Brake Fuse Position Mechanism
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Solution Overview
Problem
Rail vehicle braking systems face issues with the parking brake being inadvertently in a working position during locomotion, leading to potential undetected continuous movement and risk, due to temperature-induced changes in the braking system's state, which can cause overheating and damage.
Innovation Solution
A rail vehicle braking system with a retractable load transmission member that changes state at a predetermined temperature threshold, forcing the braking piston from its working position to a fuse position, thereby limiting or canceling the load on the brake disk, and incorporating a temperature sensor and control unit to manage this transition.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the parking brake is left in the working position during locomotion, then the brake remains engaged providing continuous braking force, but this causes overheating and potential damage to the braking system
Solution Approach 1:
The patent implements a feedback mechanism using a temperature sensor that continuously monitors the brake disk temperature and sends signals to the control unit. When the temperature exceeds a predetermined threshold, the control unit automatically actuates the parking brake to disengage, creating a closed-loop feedback system that prevents overheating while maintaining reliable brake engagement under normal conditions
Solution Approach 2:
The braking system performs self-protection by automatically detecting abnormal temperature conditions and self-correcting by disengaging the brake through the control unit and actuator mechanism, eliminating the need for external intervention or manual monitoring to prevent damage
2Object-affected harmful factors
If the parking brake is automatically disengaged at high temperatures, then overheating is prevented, but the system complexity increases due to additional sensors and control mechanisms
Solution Approach 1:
The patent introduces a control unit as an intermediary between the temperature sensor and the parking brake actuator. This control unit processes temperature signals and automatically commands brake disengagement when thresholds are exceeded, providing a simple yet effective intermediary layer that prevents overheating without requiring complex control algorithms or multiple additional components
Solution Approach 2:
The system monitors and responds to changes in the temperature parameter of the brake disk. By setting a predetermined temperature threshold and automatically actuating the brake disengagement when this parameter exceeds the threshold, the system achieves overheating prevention through simple parameter-based control rather than complex multi-variable analysis
3Object-affected harmful factors
If the braking piston is forced into the fuse position, then the load on the brake disk is limited or cancelled preventing damage, but the braking capability is reduced
Solution Approach 1:
The patent implements a protective mechanism that forces the braking piston into a fuse position as a pre-established safety measure. This position acts as a cushion or limit that prevents excessive force transmission to the brake disk under abnormal temperature conditions, sacrificing some braking capability in extreme cases to protect the braking system from catastrophic failure
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
Ensures safe and reliable operation by detecting and mitigating the abnormal situation of the parking brake being engaged during locomotion, preventing overheating and potential damage to the braking system and its environment, while allowing for a more compact and efficient braking system design.
Implementation Method 1
A rail vehicle braking system with a retractable load transmission member that changes state at a predetermined temperature threshold, forcing the braking piston from its working position to a fuse position
Implementation Method 2
incorporating a temperature sensor and control unit to manage this transition
Data Source
AI summary
Disclosed is a brake system for a railroad vehicle, including a parking brake provided with a piston and having a first configuration in which the piston is in a working position in which it acts on a lining support and applies a predetermined force to a brake disc; a second configuration in which the piston is in a rest position in which it does not act on the support and does not apply any force to the disc; and a third configuration in which, when the vehicle is not at a standstill and the ambient temperature in the environment of the disc is greater than a threshold value, it forces the piston to move towards a trip position different from its working and rest positions, in order to limit or cancel the force applied to the disc.