Temperature compensating flux ring

摘要

A piston assembly (16) for magneto rheological (MR) fluid vibration damper affixed to a suspension system includes a piston that strokes inside a housing (12) to dampen vibrations. The piston includes a core (18) affixed to a piston shaft (20). An electric coil (22) is affixed to the core and is coaxially aligned with the piston shaft. A sleeve (26) circumscribes the piston core having a wall (27) with a first inner diameter. An annular fluid passage (28) is formed between the sleeve and the core. Fluid passes through the annular passage when the piston strokes inside the damper. The wall includes a channel (32) having a second inner diameter greater than the first inner diameter. The channel reduces resistance to the piston from the MR fluid derived from temperature induced viscosity variations. <IMAGE>