Rail Vehicle Spring-Loaded Brake Emergency Release
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Solution Overview
Problem
Current emergency release devices for spring-loaded brakes in rail vehicles require direct operation on the brake actuator, are not easily reversible, and lack selective control, especially in scenarios with multiple pressure-generating devices where only specific brakes need to be released.
Innovation Solution
An emergency release device with a hydraulic pump and cylinder for each brake, featuring anti-parallel check valves and electromagnetically actuated 3/2-way valves with spring return, allowing selective release from a central control, including manual operation options to ensure functionality during power failures, and check valves to prevent unintentional brake release.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If emergency release is performed directly at the brake actuator, then the brake can be released, but the driver must leave the cab and cannot easily reapplied the brake
Solution Approach 1:
A hydraulic emergency release line with check valves and selection valves acts as an intermediary between the driver's cab and the brake actuators. This allows the driver to release brakes remotely without leaving the cab, while the check valves prevent unintended release and the selection valves enable controlled operation.
2Ease of operation
If a manually operated threaded spindle is used for emergency release, then the brake can be released, but it cannot be easily and quickly reapplied
Solution Approach 1:
The system uses hydraulic pressure to both apply and release the brakes. The spring-applied brake uses spring pressure to apply, while hydraulic pressure releases it. This hydraulic mechanism allows for quick and easy reapplication by simply restoring hydraulic pressure, unlike manual threaded spindles which require manual cranking.
3Adaptability or versatility
If all brakes are released together in an emergency, then the vehicle can continue, but selective release capability is lost
Solution Approach 1:
The braking system is segmented into multiple independent brake circuits, each with its own pressure-generating unit and selection valve. This allows selective release of individual brakes or groups of brakes by operating the corresponding selection valve, providing flexibility while maintaining system integrity.
4Ease of operation
If hydraulic pressure is used to release the brake, then the brake can be released, but the system cannot operate if the pressure-generating component fails
Solution Approach 1:
The system incorporates a manual pump as a backup pressure-generating device. If the automatic hydraulic pump fails, the manual pump can be used to generate the necessary hydraulic pressure for brake release. This redundancy ensures the system remains reliable even when the primary pressure-generating component fails.
5Reliability
If check valves are added to prevent unintentional brake release, then safety is improved, but the hydraulic line complexity increases
Solution Approach 1:
The check valve function is extracted as a separate, dedicated component in the hydraulic line rather than being integrated into the valve bodies. This isolation of the safety function makes the system more reliable and easier to maintain, as the check valve can be independently inspected and replaced without affecting other components.
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
Enables selective emergency release of specific brakes or groups with minimal manual intervention from the driver's cab, maintaining safety by ensuring brakes are automatically reapplied if power fails and preventing unintentional brake release due to leaks.
Implementation Method 1
These spring-applied brakes are released by hydraulic or pneumatic pressure
Implementation Method 2
which use spring pressure to press brake pads against brake discs
Implementation Method 3
an electromagnetically actuated 3/2-way emergency release selection valve with spring return
Data Source
Figure 1
Figure 2~5
Figure 6
AI summary
The invention relates to an emergency release device (1) for a spring-loaded brake of a rail vehicle, comprising a hydraulic pump (4) and a hydraulic cylinder (2, 3) for each spring-loaded brake to be released, hydraulic lines (5, 6) between the hydraulic pump (4) and the spring-loaded brake as well as two non-return valves (7, 8) which are connected in an anti-parallel manner, an electromagnetically actuatable 3/2-way emergency release selection valve with spring return (9) and a manually actuatable 3/2-way emergency release shut-off valve (10) which are designed to be able to cause a chassis-selective emergency release both remotely and manually.