CONNECTING JOINT OF SLIP SWITCH DRIVE SET Russian patent published in 2012 - IPC B22F5/00 E01B7/00 C22C33/02 

FIELD: transport.

SUBSTANCE: invention relates to slip switch control devices, particularly, to switch set. Proposed connecting joint consists of clevis of working or control tie rod, clevis rigidly jointed with switch blade, pin made up of bolt, and sleeves fitted on bores made in said clevises. Said sleeves are made from material containing in wt %: graphite - 0.6-1.5, nickel - 1.0-3.0, copper - 2.5-5.0, molybdenum disulphide - 0.8-1.0, iron making the rest. Besides, they feature bulk porosity not exceeding 25% and wall thickness of 5.0-6.0 mm, and impregnated with lubricant with freezing point not below -60°C. Additionally, said lubricant contains powder of molybdenum disulphide and copper in amount of 1.5-5.0 wt % each. Porosity of powders makes 0.1-10 mcm. Axle is made from high-quality carbon steel subjected to surface hardening and has cylindrical and threaded sections. Said cylindrical section is subjected to plastic surface deformation to hardness of surface layer 20-80% higher than that of base layer and roughness R_a not exceeding 0,8. Chamfer is made between said threaded and cylindrical section with radius of curvature at extension to cylindrical section.

EFFECT: longer life, higher wear resistance.

7 cl