초록 ▼

A damper body for a magnetorheological (MR) damper and associated methods of forming the damper body. The damper body is formed of a base material, such as a steel, and is coated with an abrasion-resistant layer comprising chromium. The layer of chromium provides a sliding wear surface for sliding c

A damper body for a magnetorheological (MR) damper and associated methods of forming the damper body. The damper body is formed of a base material, such as a steel, and is coated with an abrasion-resistant layer comprising chromium. The layer of chromium provides a sliding wear surface for sliding contact with a reciprocating piston. To avoid high-stress abrasive wear over the expected service life of the magnetorheological damper, the layer of chromium has a minimum thickness greater than or equal to a minimum thickness of about 8 .mu.m. In other embodiments, before applying the abrasion-resistant layer of chromium, the damper body is coated with a layer of a hard coating material having a hardness greater than the hardness of the base material. The effective hardness of the damper body is a composite of the respective hardnesses of the base material comprising the damper body and the layer of hard coating material. The thickness of abrasion-resistant layer of chromium is chosen in direct relation to the effective hardness.

대표청구항 ▼

1. 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≥25 .mu.m of nickel

1. 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≥25 .mu.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 tm[]8 .mu.m for y≥50 .mu.m and tm[]8 .mu.m+0.16 (50-y) for 25.ltoreq.y<50.