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| Air brake | |
|---|---|
| Name | Air brake |
| Type | Pneumatic braking system |
Air brake Air brake systems use compressed air to transmit force and apply braking across vehicles and machinery, integrating pneumatic reservoirs, valves, and actuators to convert stored energy into mechanical braking. These systems have been employed in industrial, Railroad rolling stock, heavy Commercial vehicle fleets, and Aviation since the late 19th and early 20th centuries, evolving alongside standards set by bodies such as the American Society of Mechanical Engineers, the International Organization for Standardization, and the Federal Aviation Administration. Air brake technology links to innovations in compressors by firms like Westinghouse Air Brake Company and regulatory action from agencies including the National Highway Traffic Safety Administration and the International Civil Aviation Organization.
Air brakes are pneumatic systems that store compressed air in reservoirs and route it through valves to service brakes via actuators such as brake cylinders, chambers, or discs. Early industrial innovators and companies—George Westinghouse, George Stephenson, Robert Stephenson and Company, and firms like Knorr-Bremse—contributed to diffusion across United Kingdom, United States, and Germany. Modern air brakes integrate electronic control modules compliant with standards promulgated by the Society of Automotive Engineers, the European Union Agency for Railways, and the International Electrotechnical Commission.
Development began with pneumatic experiments in the 19th century, with pivotal demonstration and commercialization by George Westinghouse and the Westinghouse Air Brake Company in the 1860s for Railroad use. Adoption accelerated through the late 19th and early 20th centuries amid expansion of networks like the Pennsylvania Railroad and the Great Western Railway. Cross-industry transfer occurred as heavy Freight trucking firms and manufacturers such as Daimler AG and MAN SE adapted pneumatic braking for road applications. Aviation adoption followed with certification regimes from the Civil Aeronautics Authority and later the Federal Aviation Administration, influenced by landmark mishaps investigated by bodies like the National Transportation Safety Board.
Air brakes fall into multiple families: fail-safe spring-applied forms used on Railroad wagons, service brakes employing single-line or dual-line control used on Commercial vehicle fleets, and pneumatic-assisted systems in Aircraft. Key operational principles include reservoir charging by compressors, pressure modulation by control valves (e.g., triple-valve, relay valve), and actuation via cylinders or chambers. Designs incorporate pressure-proportional control, modulation loops from the European Train Control System era, and integration with electronic braking systems promulgated by the International Electrotechnical Commission and Society of Automotive Engineers standards.
Typical components include air compressors driven by prime movers from manufacturers like Cummins and Caterpillar, air dryers, reservoirs, pressure regulators, protection valves, control valves (including relay and quick-release valves), brake chambers or cylinders, slack adjusters, and friction elements such as shoes and pads made by suppliers like Brembo or Continental AG. System design accounts for thermal dissipation, corrosion resistance per standards from the American Petroleum Institute for industrial installations, and redundancy doctrines found in Federal Aviation Administration advisory circulars. Materials and manufacturing processes reference specifications used by General Electric and Siemens for rolling stock.
Railway: Air brakes are integral to trains operated by entities like Union Pacific Railroad, Deutsche Bahn, and Indian Railways; designs accommodate long brake pipes, graduated-release features, and fail-safe application on breakdown per regulations by the Federal Railroad Administration and the European Union Agency for Railways. Road vehicles: Heavy truck operators such as DHL, FedEx, and fleets regulated under rules by the Department of Transportation rely on air brake systems with components meeting Society of Automotive Engineers standards and inspection codes enforced by agencies like the National Highway Traffic Safety Administration. Aircraft: Pneumatic and compressed-air systems supplement hydraulic systems on types certified by the Federal Aviation Administration and European Union Aviation Safety Agency, used for functions including emergency braking, nose-wheel steering, and anti-skid integration on airframes produced by Boeing and Airbus.
Regulation is delivered through interlinked national and international frameworks: Federal Aviation Administration and European Union Aviation Safety Agency airworthiness directives for aircraft, Federal Railroad Administration and European Union Agency for Railways safety orders for rails, and road statutes enforced by the National Highway Traffic Safety Administration and national ministries of transport. Consensus standards from the International Organization for Standardization, the Society of Automotive Engineers, the International Electrotechnical Commission, and testing protocols from Underwriters Laboratories govern materials, performance, and interoperability. Safety features include automatic application on loss of pressure, redundancy, pressure relief, and anti-skid systems influenced by lessons from high-profile incidents investigated by the National Transportation Safety Board.
Routine maintenance follows schedules similar to those mandated by operators like Amtrak and fleet managers at companies such as Maersk, emphasizing periodic inspection of compressors, dryers, reservoirs, valves, hoses, and friction materials according to procedures recommended by American Society of Mechanical Engineers and manufacturer manuals from Knorr-Bremse and Wabco. Troubleshooting employs pressure gauges, leak detection, bench testing of control valves, and diagnostic interfaces compliant with Society of Automotive Engineers communications standards; corrective actions range from adjustment of slack adjusters to replacement of brake chambers or regulators. Preventive maintenance programs are shaped by regulatory audits from entities like the Federal Railroad Administration and corporate safety management systems used by Deutsche Bahn and Union Pacific Railroad.
Category:Pneumatic braking systems