Alcatel Cit

Elisabeth Rulliere

Jean-Paul Yonnet

Jerome Delamare

The bearing has a fixed portion, and a moving portion, and includes a passive magnetic abutment composed of a fixed element secured to said fixed portion, and of a moving element secured to said moving portion. The bearing further including a passive magnetic centering bearing which is coaxial with said passive abutment, and which is composed of a fixed element secured to the fixed portion, and of a moving element secured to the moving portion, the passive abutment externally surrounding the passive centering bearing, the passive abutment having axial stiffness k.sub.ab, radial stiffness k.sub.rb, a mean radius R.sub.mb, and an inside radius R.sub.ib, and said passive centering bearing having axial stiffness k.sub.ac, radial stiffness k.sub.rc, a mean radius R.sub.mc, and an outside radius R.sub.ec, an air gap e separating the fixed element of said abutment from the moving element thereof and separating the fixed element of the centering bearing from the moving element thereof, these parameters being chosen so as to satisfy the following three relationships simultaneously:

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Grenoble, France

Elisabeth Rulliere