Pneumatic Valve Arrangement for Trailer Vehicle Braking
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Solution Overview
Problem
The existing pneumatic valve arrangements for trailer vehicles have a complex check valve design that is highly integrated with the emergency braking device, leading to increased space requirements and a higher risk of installation errors, and the blocking effect of the check valve can be disadvantageous when the trailer is parked on an inclined road or subject to pressure fluctuations.
Innovation Solution
A separate pneumatic valve arrangement with integrated parking and release valves, where the check valve is either part of a directional control valve or provided parallel to it, allowing for better functional separation and simpler structure, reducing space requirements and installation risks, and enabling cancellation of the blocking effect based on specific criteria such as the switching status of the emergency brake device and pressure connections.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the check valve is highly integrated with the emergency braking device, then the functional integration is improved, but the device complexity and space requirements increase
Solution Approach 1:
The valve arrangement is divided into functionally independent modules: the emergency braking device with its check valve, and the parking valve with its pressure safety valve. This segmentation allows each module to perform its specific function without interfering with the other, reducing overall system complexity while maintaining functional integration at the system level.
Solution Approach 2:
The check valve is extracted from the parking valve assembly and integrated into the emergency braking device instead. This extraction eliminates the conflict between the check valve's blocking effect and the pressure safety valve's pressure equalization function, thereby reducing device complexity and space requirements.
2Adaptability or versatility
If the check valve is highly integrated with the emergency braking device, then the functional integration is improved, but the installation error risk increases
Solution Approach 1:
By segmenting the valve arrangement into separate functional modules (emergency braking device with check valve, and parking valve with pressure safety valve), the patent reduces installation complexity. Each module can be installed and tested independently, minimizing the risk of installation errors while maintaining overall system integration.
3Reliability
If the check valve maintains pressure in spring-loaded brakes, then the brake holding function is improved, but the unwanted actuation risk increases on inclined roads
Solution Approach 1:
The pressure safety valve acts as an intermediary between the supply connection and the parking valve output. It mediates the pressure differential that would otherwise cause the check valve to block and trigger unwanted parking brake actuation. When supply pressure drops below output pressure (as on inclined roads), the pressure safety valve opens to equalize pressures and prevent false triggering.
Solution Approach 2:
The pressure safety valve provides preliminary anti-action by preemptively equalizing pressures before the check valve can cause unwanted blocking. It anticipates pressure differential conditions that would lead to harmful effects and counteracts them in advance, preventing unwanted parking brake actuation while maintaining reliable brake holding.
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
This configuration enhances safety by allowing for easier installation, reduced space requirements, and improved functional separation of the valve arrangement from the emergency braking device, while ensuring the blocking effect of the check valve can be canceled as needed, preventing unwanted actuation of the parking brake.
Implementation Method 1
The check valve prevents compressed air from flowing out of the release chambers of the spring brakes, even if the pressure in the reservoir drops briefly
Implementation Method 2
The pressure safety valve ensures a pressure at the output port against a pressure drop at the supply port, the effect of the pressure safety valve being canceled when the pressure at the supply port or the pressure difference between the pressure at the supply port and the pressure at the output port falls below a threshold value
Data Source
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AI summary
The invention relates to a pneumatic valve arrangement (10) for a trailer vehicle having a reservoir (44), emergency brake device (45) and spring-loaded brakes (46), having the following features: a) a supply connection (1-1) for connecting to a compressed air supply fed by a towing vehicle, b) a reservoir connection (1-2) for connecting to the reservoir, • c) an emergency brake pressure connection (21) for connecting to the emergency brake device, d) a spring mechanism pressure connection (22) for connecting to the spring-loaded brakes, e) a ventilation connection (3), f) a check valve (42) between the reservoir connection (1-2) and the spring mechanism pressure connection (22), having a blocking effect for holding a pressure in the spring-loaded brakes. According to the invention, the blocking effect of the check valve can be cancelled.