Elastomeric suspension spring for a motor vehicle and a suspension joint incorporating the spring

Abstract

An elastomeric suspension spring (14) usable for bearing the load of a motor vehicle, which exhibits both reduced creep and improved endurance in torsion and a suspension joint comprising this spring consists of a cross-linked rubber composition based on (phr: parts by weight per hundred parts of diene elastomer(s)): natural rubber in a quantity equal to or greater than 60 phr, a filler, and a sulfur cross-linking system comprising at least one cross-linking accelerator, and is such that said filler comprises, in a mass fraction greater than 55%: a carbon black, whose grade varies from 600 to 900, said composition comprising in this case a total quantity of filler of from 10 to 60 phr, or an inert white filler, said composition comprising in this case a total quantity of filler of from 10 to 30 phr, the 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 2.70.

Dependencies are inferred from the claim text.