Sensor-carrier cap for a bearing of a wheel hub

A hub-bearing assembly for a wheel of a motor vehicle, the assembly comprising:

• a central hub rotatable about a central axis (X) of rotation;
• a rolling bearing including a stationary ring arranged radially outwardly of the central hub, and rolling elements arranged between the stationary ring and the central hub, the stationary ring forming a tubular appendage which protrudes from an axially inner side of the stationary ring and has a radially inner surface extending in an axial direction;
• wherein
• the radially inner surface provides an axially inner surface portion, an axially outer, undercut surface portion having an inner diameter (D) greater than an inner diameter (d) of the axially inner cylindrical surface portion, and a connecting surface portion which connects the axially inner surface portion and the axially outer, undercut surface portion,
• an encoder disposed between the central hub and the radially inner surface of the tubular appendage, and
• a sensor-carrier cap having;
• a bottom wall arranged transversely to a central axis (A) and providing a seat for accommodating a rotational speed detecting sensor,
• a cylindrical mounting wall extending axially from one side of the bottom wall around said axis (A), and
• snap locking means projecting in a radially outer direction from the cylindrical mounting wall, for locking the sensor-carrier cap on a tubular appendage of a wheel hub bearing, and
• the sensor carrier cap being mounted on the tubular appendage on the stationary ring, wherein
• the snap locking means of the cap engage the axially outer, undercut surface portion of the tubular appendage, the snap locking means comprising a protuberance located on a radially outer surface of the cylindrical mounting wall at an axial end of the cylindrical mounting wall opposite from the bottom wall, the protuberance including an edge portion and a connecting portion and being configured such that, when the cylindrical mounting wall is viewed in radial cross section, none of an outer surface of the protuberance is colinearly aligned with and parallel with the radially outer surface of the cylindrical mounting wall, wherein the cylindrical mounting wall and associated snap locking means are devoid of metallic reinforcements, the protuberance being axially aligned with the encoder when the protuberance is engaged with the axially outer, undercut surface portion to snap lock the sensor-carrier cap thereto.