Variable-rigidity positioning device for bogie axlebox of railway car

摘要

A variable-rigidity positioning device for a bogie axlebox of a railway car, comprising a vertical elastic member (20) disposed between the top face of an axlebox bearing saddle (10) and the bottom face of a side-frame guide block (40), and a horizontal elastic member (30) disposed between the axlebox bearing saddle (10) and the front side and back side of the side-frame guide block (40). The horizontal elastic member (30) is provided with at least one low-rigidity elastic element (31) and one high-rigidity elastic element (32), said low-rigidity elastic element (31) being disposed in an elastic-member precompression device (33) and, when under the effect of a precompression load F1, being arranged in serial connection with the high-rigidity elastic element (32). When the amount of horizontal warp displacement of the horizontal elastic member (30) is small, said member has a large degree of horizontal compression rigidity, thereby ensuring that when the railway car travels along a straight line, the critical speed during snaking is high, thus satisfying requirements for increased car speed. When the amount of horizontal warp displacement reaches a fixed numerical value, the degree of horizontal compression rigidity of the horizontal elastic member begins to decrease, thereby ensuring that when the railway car negotiates a curve, the transverse force between the wheels and the rails is not too great, thus safeguarding the safe travel of the car over curving tracks.