Quick Exhaust Valve for Service Brake Pressure Relief
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Solution Overview
Problem
Existing service brake devices with ABS control face challenges in rapidly relieving pressure during emergency braking, leading to suboptimal braking performance and increased braking distance due to slow pressure reduction gradients.
Innovation Solution
A quick exhaust valve is integrated directly on the service brake cylinder, connecting the pressure chamber and spring chamber, allowing compressed air to flow from the pressure chamber to the spring chamber during pressure reduction, enhancing the release force and reducing the braking distance by eliminating the need for long pneumatic paths.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If compressed air is routed via ABS pressure control valves for ventilation, then brake pressure can be controlled during ABS intervention, but pressure relief speed is reduced due to the slow pressure reduction gradient
Solution Approach 1:
The ventilation path is segmented into two separate functions: (1) ABS pressure control valves handle brake pressure modulation during ABS intervention, and (2) a dedicated quick release valve handles rapid pressure relief. This segmentation allows each component to optimize its specific function without compromising the other, resolving the contradiction between controlled pressure modulation and rapid pressure relief.
Solution Approach 2:
A quick release valve is introduced as an intermediary component between the brake cylinder and the atmosphere. This intermediary provides a dedicated rapid venting path that operates independently from the ABS pressure control system, enabling fast pressure relief while the ABS system maintains its pressure control function through the brake line.
2Ease of operation
If a quick release valve is arranged remotely from the brake cylinder, then brake line bleeding is possible, but the ventilation path length increases reducing pressure relief efficiency
Solution Approach 1:
The quick release valve is extracted from the remote brake line location and repositioned directly on the brake cylinder. This extraction from the conventional remote positioning eliminates the long pneumatic path, reducing pressure relief time while maintaining the valve's essential function of rapid air evacuation.
Solution Approach 2:
The quick release valve is integrated in a different spatial dimension - directly mounted on the brake cylinder body rather than being positioned remotely in the brake line. This dimensional repositioning creates a short ventilation path while still providing effective pressure relief functionality.
3Extent of automation
If compressed air flows through long pneumatic paths to ABS pressure control valves, then centralized brake pressure control is achieved, but pressure reduction gradient is reduced
Solution Approach 1:
The pressure control function is segmented into two independent pathways: (1) a long pneumatic path through ABS pressure control valves for centralized automated pressure control, and (2) a short direct path through the quick release valve for rapid pressure reduction. This segmentation allows both centralized control and high productivity to coexist by assigning different functions to different pathways.
Solution Approach 2:
The quick release valve acts as a local intermediary that provides rapid pressure relief directly at the brake cylinder, bypassing the need for compressed air to traverse the entire long pneumatic path back to the ABS control valves. This intermediary enables high-speed pressure reduction while the centralized control system maintains its automated pressure management function.
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 enables faster pressure relief during ABS control interventions, significantly reducing wheel collapse and improving braking dynamics by utilizing a commercially available quick-release valve, thus enhancing the control quality and reaction speed to braking requests.
Implementation Method 1
configured to shut off the first port and connect the second port to the third port due to a pressure drop caused in the brake pipe
Implementation Method 2
accommodates spring means that pretension the piston and/or the membrane in the release position of the service brake
Data Source
Figure 1~2
Figure 3
AI summary
The invention relates to a service brake device for vehicles comprising at least one pneumatic service brake device (22) with at least one piston and/or a membrane (28) which delimits a pressure chamber (24) which can be supplied with compressed air for applying the service brake and can be purged of compressed air for releasing the service brake, and delimited by a spring chamber (30) which receives spring means (38) prestressing the piston and/or the membrane (28) in the release position of the service brake. Said pressure chamber (24) comprises a pressure connection (26) which can be charged and purged by the brake line (56). The invention also relates to a quick air release valve (1) controlled by the pressure produced in the brake line, which is connected by the first connection thereof (2) to the brake line, by the second connection thereof (4) to the pressure connection (26) of the service brake cylinder (22) and by the third connection thereof (6) to the spring chamber (30) of the service brake cylinder (22), and which connects the second connection (4) to the third connection (6) based on a drop in pressure produced in the brake line (56).