Patent ID: 6464051
Filing Date: 2002-10-15
Classification: F16F

Abstract:
A magnetorheological damper comprising: a damper body having a cylindrical inner surface, said damper body formed of a base material ofa first Brinell hardness number of at least about 90 BHN; a piston mounted for sliding movement within said damper body; a layer of thickness y&gE;25 &mgr;m of nickel covering the cylindrical inner surface, said nickel having a second Brinell hardness greater than the first Brinell hardness number of the base material; and an abrasion-resistant layer comprising chromium covering the layer of nickel, said abrasion-resistant layer defining a sliding wear surface for sliding movement of said piston and having a sufficient additional thickness greater than a minimum thickness tm such that the base material does not experience significant high-stress abrasive wear over an expected service life of the magnetorheological damper, wherein tmâ‰…8 &mgr;m for y&gE;50 &mgr;m and tmâ‰…8 &mgr;m+0.16 (50âˆ’y) for 25&lE;y<50.