HYDRAULICALLY APPLIED RAILWAY TYPE FREIGHT CAR PARKING BRAKE SYSTEM

摘要

A hydraulically applied railway type freight car parking brake system includes a source of hydraulic pressure disposed on the freight car for supplying a predetermined fluid pressure sufficient to actuate and maintain the parking brake system in a brake application position. A force transmitting cylinder is disposed on a truck portion of the freight car in fluid communication with the source of hydraulic pressure for exerting a predetermined force on at least one brake beam carrying a pair of brake shoes. The brake shoes are brought into and maintained in frictional engagement with a portion of a respective surface of a tread portion of a pair of wheels during an application of the parking brake. A pump may be used to apply hydraulic pressure from the source to the cylinder.