FIELD: machine building.
SUBSTANCE: invention relates to machine building, particularly, to production of bushings of lever braking system of rail passenger or freight transport, including subway cars operated without lubrication. Bushing of lever braking system of rail transport is made of composite polymer antifriction material, which includes polymer base and containing as fiber filler carbon fiber, as well as chaotically arranged carbon nanotubes in the form of single-layer or multilayer with number of layers from 2 to 70 or embedded into each other graphite planes, the outer diameter of carbon nanotubes is selected from 0.1 to 100 nm, and their length from 1 to 70 mcm, wherein the polymeric base of the composite polymer antifriction material used is a thermoplastic selected from a group of polyamide 6.6 (PA-6.6 – polyhexamethylene adipamide) or polyamide 12 (PA-12 – polydedecaamide), or using a thermoplastic elastomer selected from a group of polyamide 6 copolymer and polyester (PA6+PE) or copolymer of polyamide 12 and polyester (PA12 + PE), with the following quantitative content of components, wt%: carbon fiber 8.2–43.8; carbon nanotubes 0.02–2.0; thermoplastic or thermoplastic elastomer – up to 100 %.
EFFECT: increased service life of bushing of lever braking system of rail transport due to reduction of intensity of linear wear of working sliding layer at friction along polished steel pair from steel 40X, preservation of preset friction coefficient and stability of friction coefficient at friction on material of counter body of steel 40X, increase of destructive stress at tension and compression, increase of Charpy impact viscosity on specimens without notch.
4 cl, 2 tbl
