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ACCOUNTING FOR THE ELASTIC COMPONENT OF THE STROKE OF THE ROD IN THE BRAKE SYSTEM OF A TRUCK OF A FREIGHT CAR WITH A CYLINDER 670B

The application of braking systems with the lo-cation of the executive mechanism directly upon a bogie is a promising trend in domestic brake production and freight car manufacturing on the whole. In the paper a common circuit of a braking rod leverage with the location of cylinders 670V on the bogie of two-axle type 2 and type 3 (RSS 9246-2013) is considered. The investigation carried out in the work is a continuation of works connected with the updating of a braking system developed earlier. 
 The aim of the work consists in the definition of cylinder rod outlet limits taking into account elastic deformation of all elements of leverage in accordance with the procedure developed and appraised earlier and also the definition of maximum possible thickness of a brake pad used for this circuit in operation. The rod outlet limits obtained will be standard as system transmission ratio is unified, and an elastic constituent will have minimum deviations from the value obtained and depend upon a specific execution of elements. 
In this investigation there is used a 3D brake system model developed thoroughly that allows obtaining an elastic deformation value precise enough. Furthermore, data obtained allow defining a maximum operation outlet of rod of the braking cylinder 670V in the system analyzed during car motion on a long steep slope. 
On the basis of the investigations carried out there are defined the limits of rod outlet (35…47mm) for the developed common brake system with cylinders 670V that allows using brake pads of maximum width (65+5mm) used in railway freight rolling-stock of the RF. The maximum operation value of rod outlet is obtained during car motion on a steep long slope (63mm) which does not exceed a working stroke of a cylinder (100mm).