BUSHING FOR LEVER BRAKING SYSTEM OF RAIL TRANSPORT Russian patent published in 2007 - IPC F16C33/04 B61H13/34 

FIELD: mechanical engineering, namely, bushings with sliding working surface, for lever braking system of rail transport, for example, passenger and cargo, including tube railway cars.

SUBSTANCE: bushing of lever braking system of rail transport is made two-layered of polymer composite material, and consists of internal working sliding layer and external damping layer. Internal sliding layer is made of polymer anti-friction composite material, containing a mixture of poly-oxy-diasol and cotton fiber as fibrous filler. As power filler - silicon oxide in form of marshalite or colloid silica. As adhesive - polyvinyl-acetate and/or polyvinyl-butyrale. As anti-adhesive - zinc stearate and/or calcium stearate, and as binding agent - phenol-formaldehyde or cresol-formaldehyde resin in novolak and/or resol form. External damping layer is made of polymer anti-friction composite material, containing cotton fiber as fibrous filler. As powder filler - nitrile rubber. As adhesive - polyvinyl acetate and/or polyvinyl butyrale, as anti-adhesive - zinc stearate and/or calcium stearate, and also as binding agent - phenol-formaldehyde or cresol-formaldehyde reson in novolak and/or resol form.

EFFECT: increased lifetime of bushing due to decreased total wear of steel in friction couple, decreased intensiveness of linear wear, increased strength limit during compression and increased impact toughness while preserving resistance to segregation.

7 cl, 3 tbl