Park Release Valve Piston Segmentation for Trailer Brake Reliability
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Solution Overview
Problem
Existing park release valves for trailer vehicles with pneumatic brake systems are complex and prone to incorrect operation or pressure equalization between reservoir pressure and supply connections, leading to undesired pressure equalization and misalignment.
Innovation Solution
A compact park release valve design utilizing two control pistons, each movable into two positions, with a check valve to prevent air flow from the reservoir pressure connection to the supply pressure connection, and an actuating device mechanism to ensure correct operation, preventing incorrect switching between positions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a compact park release valve design is used, then the device complexity is reduced, but the reliability may worsen due to potential incorrect operation or pressure equalization
Solution Approach 1:
The valve is divided into two independent control pistons (first control piston for park position, second control piston for release position), each handling specific pressure domains. This segmentation allows compact design while maintaining reliability through functional separation, preventing pressure equalization between reservoir and supply connections.
Solution Approach 2:
A check valve is introduced as an intermediary element between the reservoir pressure connection and supply pressure connection. This check valve acts as a mediator that allows pressure equalization in one direction only, preventing unwanted reverse flow while maintaining the compact single-valve design.
2Reliability
If two control pistons are used to prevent incorrect operation, then the operation reliability is improved, but the device complexity increases
Solution Approach 1:
Two control pistons are merged into a single integrated valve body, sharing common components such as the valve housing, sealing elements, and check valve. This merging approach improves switching reliability through independent control paths while avoiding the complexity of two separate valve assemblies.
Solution Approach 2:
The first control piston serves multiple functions: controlling park position, preventing pressure equalization, and working in conjunction with the check valve to maintain pressure domains. This multi-functionality reduces the need for additional components, maintaining compact design while improving reliability.
3Object-affected harmful factors
If separate pressure domains are maintained for reservoir and supply connections, then the harmful factors are reduced, but the device complexity increases due to additional control mechanisms
Solution Approach 1:
The check valve is extracted as a separate functional element within the valve assembly, specifically tasked with preventing unwanted pressure equalization between reservoir and supply connections. This extraction allows the main control pistons to focus on position control while the check valve handles pressure domain separation.
Solution Approach 2:
The solution uses pneumatic principles through the check valve to automatically maintain pressure domain separation without mechanical linkages or complex control mechanisms. The check valve leverages pressure differential to prevent reverse flow, using the system's own pneumatic pressure to enforce the separation.
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 provides a compact, high-functionality park release valve that prevents undesired pressure equalization and misalignment, ensuring accurate operation and safe maneuvering of trailer vehicles by maintaining separate pressure domains for reservoir and supply connections.
Implementation Method 1
a check valve to prevent air flow from the reservoir pressure connection to the supply pressure connection
Implementation Method 2
two control pistons, each movable into two positions... when both control pistons are in the travel position, the connection for reservoir pressure is connected to the pressure outlet
Implementation Method 3
In the released position, this valve uses compressed air from the trailer's reservoir to pressurize and release the brake cylinders
Data Source
Figure 1
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Figure 5
AI summary
The invention relates to a park release valve for a trailer vehicle with a pneumatic brake system for controlling the pressure in the spring accumulator brake cylinders. The valve contains a first control piston, a second control piston, a connection for stored pressure, a connection for storage container pressure, a ventilation connection, and a connection in the form of a pressure outlet, wherein the first control piston can be moved into a drive position and a park position, and the second control piston can be moved into a drive position and a release position. When both control pistons are in the drive position, the connection for stored pressure is connected to the pressure outlet; when the first control piston is in the park position and the second control piston is the drive position, the pressure outlet is connected to the ventilation connection; and when the first control piston is in the drive position and the second control piston is in the release position, the connection for the storage container pressure is connected to the pressure outlet.