Patent ID: 7175167

Claim:
An elastomeric suspension spring usable for bearing the load of a motor vehicle and formed of a cross-linked rubber composition based on (phr=parts by weight per hundred parts of rubber): natural rubber in a quantity equal to or greater than 60 phr; a filler comprising in a mass fraction greater than 55%: a carbon black whose grade varies from 600 to 900, said composition comprising in that case a total quantity of filler of from 10 to 60 phr, and/or an inert white filler, said composition comprising in that case a total quantity of filler of from 10 to 30 phr; and, a sulfur cross-linking system comprising at least one cross-linking accelerator, said cross-linking system comprising 0.7 to 1.2 phr of sulfur and being such that the mass ratio of sulfur to cross-linking accelerator(s) varies from 0.15 to 0.50.