Bearing for a wheel of vehicle

A vehicle wheel bearing comprising:

• an inner member including a wheel hub integrally formed with a wheel mounting flange at one end, an inner raceway surface at an outer circumferential surface of said inner member and a stepped portion, of small diameter, axially extending from the inner raceway surfaces;
• an inner ring fitted on the stepped portion and formed with an another inner raceway surface at an outer circumferential surface;
• an outer member integrally formed with a body mounting at its periphery;
• double row outer raceway surfaces at an inner circumferential surface of said outer member opposite to the inner raceway surfaces;
• double row rolling elements arranged between the outer and inner members;
• sealing devices for sealing annular spaces between the outer and inner members;
• said inner ring is secured to the wheel hub in a non-axially movable fashion relative to the wheel hub by a caulked portion formed by plastically deforming a radially outward end of the stepped portion, of small diameter, of the wheel hub;
• a sealing device on an inboard side of the bearing, the sealing devices comprises a first sealing plate arranged on the inner ring and a second sealing plate arranged on the outer member opposite to the first sealing plate;
• said first sealing plate has a radially extending portion arranged at an inboard side of the bearing;
• an elastomeric material bonded on the radially extending portion of the first sealing plate, said elastomer material includes magnetic substance powder, North and South poles are alternately magnetized along the circumferential direction;
• said second sealing plate has a substantially “L”-shaped cross-section formed by a cylindrical portion and a radially extending portion;
• side-lip(s) slidingly contact the radially extending portion of the first sealing plate;
• the tip of the radially extending portion of the first sealing plate is positioned to keep a slight radial gap relative to the cylindrical portion of the second sealing plate;
• a non-elastomeric portion of the first sealing plate extending radially inward such that the exposed portion of the inner ring is entirely covered by said non-elastomeric portion.