PREVENTING DEVICE FOR SKID OF HIGH SPEED RAILWAY VEHICLE

摘要

PURPOSE:To prevent the occurrence of the reskidding of restuck wheels by sending a brake sudden-releasing signal at the time of detecting the skid of wheels while sending a brake weakening signal which is large immediately after detecting skid while being gradually reduced with time to an electropneumatic change valve. CONSTITUTION:An electric signal having an equivalent value to a brake com mand is converted into an air pressure by means of an electropneumatic change valve 5 to operate brake shoes 14 via brake cylinders 13 through a pressure intensifier 10 in which air cylinders 16, 17 having different diameters are com bined. As the skid of a wheel is detected by a skid detector 1, a sudden-releasing signal is sent to a control valve 12 provided between the pressure intensifier 10 and the brake cylinders 13 to reduce the air pressure in the brake cylinders. At the same time, a serrated wave shaped brake weakening signal which is large immediately after skid while being reduced with time is sent to the electropneumatic conversion valve 5 to regulate brake pressure. Thereby, the reskidding of wheels once restuck can be prevented, effectively preventing increase in braking distance.