Less abrasive composition railroad brake shoe material
AssigneeJohns Manville
InventorJohn Charles Adelmann
Life of this patent
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Abstract
Low abrasion, high strength friction materials are described, containing rubber binder, inorganic filler, fiber, and not more than 1% by volume of lead and lead oxide. Organic fillers and phenolic resins may also be present. The materials find particular use as brake shoes for railroad rolling stock which uses wheels of relatively soft steel.
Claims7
An improved low abrasion lead free friction material comprising, in approximate percent by weight:
- curable rubber binder 8 - 20% phenolic resin 2 - 5% lead-free inorganic filler 35 - 60% lead-free organic filler 15 - 45% fiber 3 - 9%.
A lead-free friction material composition comprising, in percent by weight:
- curable rubber binder 13.9% phenolic resin 3.5% rubber additives 2.7% inorganic filler 41.7% organic filler 34.7% fiber 3.5% .
A lead-free friction material composition comprising, in percent by weight:
- Curable rubber binder 6.0% phenolic resin 3.2% rubber additives 4.8% inorganic fillers 48.0% organic fillers 30.0% fiber 8.0% .
A lead-free friction material composition comprising, in percent by weight;
- curable rubber binder 12.8% phenolic resin 2.6% rubber additives 1.5% inorganic fillers 57.5% organic fillers 19.2% fiber 6.4% .
An improved low abrasion lead free friction material comprising in approximate per cent by weight:
- curable rubber binder 8 - 20% phenolic resin 2 - 5% lead-free inorganic filler 35 - 60% lead-free organic filler 15 - 45% fiber 2 - 12%.
Dependencies are inferred from the claim text.