Bearing, bearing assembly comprising such a bearing and turbocharger comprising such a bearing assembly

A bearing assembly (A) comprising:

• a rotatable element (R),
• a bearing having;
• a fixed outer ring forming a lubrication ring having at least one lubrication duct extending between an outer surface and an inner surface of the outer ring,
• a rotatable inner ring, and
• wherein the at least one lubrication duct of the lubrication ring is placed so that the scalar product of:
• a vector collinear to a longitudinal axis of the lubrication duct, and
• a vector collinear to a tangent line to an outer cylindrical surface of the inner ring, at the point where the longitudinal axis of the lubrication duct intersects the outer cylindrical surface of the inner ring, and oriented in the same direction as a rotation direction of the inner ring, is greater than zero, and wherein
• the vectors are projected in a plane perpendicular to a rotation axis of the bearing, and
• a housing (H), wherein:
• the housing (H) comprises at least one lubrication duct (H2) for lubricating the bearing, said lubrication duct opening on a cylindrical inner surface (H1) of the housing (H),
• the rotatable element (R) is fastened to the inner ring of the bearing so as to rotate with the inner ring,
• the lubrication ring is mounted in the housing (H), and
• the at least one lubrication duct of the lubrication ring of the bearing is in an extension of the at least one lubrication duct (H2) of the housing (H).

A turbocharger comprising:

• a bearing assembly (A) having;
• a fixed outer ring forming a lubrication ring having at least one lubrication duct extending between an outer surface and an inner surface of the outer ring,
• a rotatable inner ring, and
• wherein the at least one lubrication duct of the lubrication ring is placed so that the scalar product of:
• a vector collinear to a longitudinal axis of the lubrication duct, and
• a vector collinear to a tangent line to an outer cylindrical surface of the inner ring, at the point where the longitudinal axis of the lubrication duct intersects the outer cylindrical surface of the inner ring, and oriented in the same direction as a rotation direction of the inner ring, is greater than zero, and wherein
• the vectors are projected in a plane perpendicular to a rotation axis of the bearing, and
• a housing (H), wherein:
• the housing (H) comprises at least one lubrication duct (H2) for lubricating the bearing, said lubrication duct opening on a cylindrical inner surface (H1) of the housing (H),
• the rotatable element (R) is fastened to the inner ring of the bearing so as to rotate with the inner ring,
• the lubrication ring is mounted in the housing (H), and
• the at least one lubrication duct of the lubrication ring of the bearing is in an extension of the at least one lubrication duct (H2) of the housing (H).