Rail Vehicle Braking System with Blocking Device
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Solution Overview
Problem
Existing rail vehicle braking systems face inefficiencies in applying consistent braking force when transitioning from service braking to parking braking, often resulting in reduced force application due to reliance on springs and manufacturing tolerances, leading to a less compact and heavier system.
Innovation Solution
A rail vehicle braking system that immobilizes the service brake piston using a blocking device, eliminating the need for springs, and utilizes dedicated pneumatic distribution devices to manage pressure agents, ensuring consistent braking force through deformable arms and controlled pressure application, thereby increasing braking force and system compactness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Force
If springs are used to apply parking brake force on the service brake piston, then the parking brake can be actuated, but the braking force is reduced due to spring stiffness and extension limitations
Solution Approach 1:
The invention extracts and eliminates the spring mechanism from the parking brake system. Instead of using springs to apply force on the service brake piston, the patent uses a direct mechanical linkage where the parking brake shoes transmit force through a lever system that acts directly on the piston rod, removing the intermediary spring element that limited force application.
Solution Approach 2:
The invention replaces the elastic spring-based mechanical system with a rigid lever-based mechanical system. The parking brake force is transmitted through a lever mechanism that provides mechanical advantage, allowing greater force to be applied to the service brake piston without the limitations of spring stiffness and extension.
2Reliability
If a distinct parking brake body with separate components is used, then the parking brake can function independently, but the system becomes less compact and heavier
Solution Approach 1:
The invention merges the parking brake components with the service brake cylinder assembly. The parking brake shoes, levers, and linkage are integrated into the existing brake cylinder structure, sharing common mounting points and structural elements, thereby reducing overall weight and improving compactness while maintaining functional independence.
Solution Approach 2:
The service brake cylinder body serves dual functions: it houses both the service brake piston and the parking brake mechanism. The cylinder body, mounting brackets, and structural components perform multiple roles, supporting both braking systems and reducing the need for separate dedicated structures.
3Device complexity
If manufacturing tolerances are relied upon for force transmission, then the system can be simpler, but the braking force consistency deteriorates
Solution Approach 1:
The invention incorporates a feedback mechanism through the lever system that provides mechanical advantage and force multiplication. The lever arms are designed with specific length ratios that compensate for variations in force application, ensuring consistent braking force output even with normal manufacturing tolerances in component dimensions.
Solution Approach 2:
The invention changes the critical parameter from direct force transmission (where small dimensional variations cause large force variations) to leveraged force transmission. By introducing lever arms with optimized length ratios, the system transforms the force transmission characteristics, making the output force less sensitive to manufacturing tolerances in individual 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
The system achieves improved braking performance with increased braking force, reduced weight, and enhanced safety by maintaining consistent braking force application, making it more efficient, compact, and cost-effective compared to prior art.
Implementation Method 1
a service brake comprising a service brake piston (8) movable relative to said body (2) to act on said braking linkage (4) and delimiting with said body (2) a service brake pressure chamber (13) configured to be supplied by a first source of pneumatic pressure agent (73) to place said service brake piston (8) in a service braking position
Implementation Method 2
The parking brake further comprises springs (24) which continuously bias the piston (23) of that parking brake towards a position referred to as low in which the parking brake is considered as being in a working configuration
Implementation Method 3
The parking brake pressure chamber (25) is connected to another source of pneumatic pressure agent (73) via a pipe (71). The piston (23) comprises at its center an aperture passed through by the thrust sleeve (20)
Data Source
AI summary
Disclosed is a railway braking system including a first pneumatic distribution device formed by a first distributor provided with a single inlet opening connected to a source for supplying pneumatic pressure mediums and with a single outlet opening connected to a parking brake chamber in order to optionally supply a parking brake with a second pneumatic pressure medium so as to place the brake in either of inoperative and operative configurations, and a second pneumatic distribution device formed by a second distributor provided with a single inlet opening connected to the supply source and with a single outlet opening connected to a service pressure chamber in order to supply a service brake with a third pneumatic pressure medium of which the pressure value is predetermined, so as to apply a predetermined braking force when the parking brake is in the operative configuration thereof.