SLEEVE OF BRAKING LEVERAGE SYSTEM OF RAIL TRANSPORT Russian patent published in 2013 - IPC F16C33/04 F16C33/12 B61H13/34 

FIELD: machine building.

SUBSTANCE: sleeve is made from composite polymer anti-friction material on the basis of polyamide containing carbon fibre or a mixture of carbon fibre with glass fibre as a fibrous filler. In addition, the material contains chaotic carbon nanotubes in the form of single-layer, multi-layer graphite planes with the number of layers of 2 to 70 or inserted into each other and bent into a tube; outside diameter of carbon nanotubes is 0.1 to 100 nm, and their length is 1 to 70 mcm. As a base, the material also contains polyamide mixture with 20-40 wt % of polyethylene caproamide. As material base polyamide, there used is polyamide 6, or Kaprolon B or Ertalon; content of fibre glass in its mixture with carbon fibre of fibrous filler of composite polymer anti-friction material is 3.48 to 10.5 wt % at the following component ratio, wt %: carbon fibre or a mixture of carbon fibre and fibre glass 9.7-42.4; carbon nanotubes 0.05-0.55; polyamide is the rest - up to 100%.

EFFECT: increasing sleeve service life due to considerable reduction of intensity of linear wear of a working layer of sliding at friction on polished steel pair from steel 40X, increasing stability of friction coefficient at friction on the material of counter body from steel 40X, and improving breaking stress at tension, preserving Charpy impact strength on specimens without any notch at simultaneous maintenance of the specified limit of compressive strength, as well as low friction coefficient at increase of its stability.

4 cl, 2 tbl