Vehicle Brake System Overload Protection via Shared Air Discharge
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Solution Overview
Problem
Existing vehicle brake systems with overload protection functions require additional components, such as the overload protection valve, which increase costs, assembly work, and space requirements due to the need for separate compressed air lines and valves.
Innovation Solution
Connecting the second compressed air line directly to the first air discharge outlet of the first compressed air line allows for equal pressure distribution between the two lines, eliminating the need for the overload protection valve and enabling efficient air discharge from the spring brake part to actuate the brake, while maintaining the parking brake function without discharging air to the atmosphere.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If an overload protection valve is added to prevent mechanical overload of the brake cylinder, then the reliability of the brake system is improved, but the device complexity and space requirements increase
Solution Approach 1:
The patent combines the overload protection function with the existing air discharge path by connecting the second compressed air line to the first air discharge outlet. This merging eliminates the need for a separate overload protection valve while maintaining the protective function, as the spring brake part can discharge air through the shared outlet to prevent mechanical overload.
Solution Approach 2:
The first air discharge outlet is designed to serve multiple functions: it discharges air from the diaphragm part during normal brake operation and simultaneously serves as an discharge path for the spring brake part to provide overload protection. This multi-functionality eliminates the need for dedicated separate components for each function.
2Reliability
If a separate overload protection valve and compressed air line are installed, then the brake cylinder is protected from mechanical overload, but the assembly work and production costs increase
Solution Approach 1:
The patent merges the overload protection air line with the existing first compressed air line by connecting the second compressed air line to the first air discharge outlet. This eliminates the need for separate piping and components, reducing assembly work and production costs while maintaining brake cylinder protection.
Solution Approach 2:
The patent extracts the overload protection function from the complex valve mechanism and implements it through the existing air discharge infrastructure. By utilizing the already-present first air discharge outlet for the spring brake part's air discharge, the system achieves protection without adding expensive and complex valve assemblies.
3Reliability
If an overload protection valve is installed in the compressed air line, then mechanical overload is prevented, but the space requirements in the vehicle increase
Solution Approach 1:
The patent eliminates the need for a separate overload protection valve by merging the spring brake part's air discharge path with the existing diaphragm part air discharge path. This consolidation removes the valve component entirely, freeing up space on the vehicle frame while maintaining the overload protection function.
Solution Approach 2:
The patent removes the unnecessary overload protection valve component from the system by utilizing the existing first air discharge outlet for dual purposes. This extraction of the redundant component directly reduces the space requirements in the vehicle while preserving the essential overload protection capability.
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 reduces space and assembly requirements, lowers costs, and provides an effective overload protection function by ensuring equal air pressure in both lines, preventing mechanical overload of the brake cylinder and reducing the need for additional components.
Implementation Method 1
The shuttle valve 26 pneumatically connects the inlet at which the higher of two pneumatic pressures applied to these inlets is present to the outlet.
Implementation Method 2
By means of a spring in the spring brake part 22 of the brake cylinder 8, it is possible to provide a spring force by means of which a brake can be actuated
Implementation Method 3
the parking brake pressure counteracts the spring force, with the result that, above a minimum parking brake pressure determined by the characteristics of the spring, the brake is no longer actuated
Data Source
AI summary
A pneumatically-operated vehicle brake system has a first compressed air line in which compressed air at a controllable service brake pressure can be provided. Membrane parts of brake cylinders can be ventilated by the service brake pressure for a service brake function. A parking brake device includes a second compressed air line in which compressed air can be provided at a parking brake pressure electro-pneumatically. Brake cylinder spring brake parts can be ventilated by compressed air at the service brake pressure to provide a parking brake function. The parking brake device also has a ventilation inlet by which the second compressed air line can be ventilated to increase the parking brake pressure, and a first ventilation outlet by which the second compressed air line can be ventilated to reduce the parking brake pressure. The second compressed air line can be pneumatically connected to the first via the first ventilation outlet.