Encoder element for a rolling-contact bearing equipped with an information sensor assembly and rolling-contact bearing including such an encoding element

An encoder element for integrally mounting to a rotating race of a rolling-contact bearing equipped with an information sensor assembly and having an axis of rotation, such that the encoder element will interact with a sensor of the information sensor assembly in order to indicate the speed of rotation of the bearing, the encoder element comprising:

• an annular target made of ferromagnetic material, the annular target being provided
• with a cylindrical bearing surface for mounting the annular target on the rotating race of the bearing and
• with a disc-shaped radial part having windows of identical size which are uniformly distributed along a circular path;
• and
• a bipolar ring having a first axial side and a second axial side opposite the first axial side,
• the second axial side being provided with axial teeth which are uniformly and circumferentially distributed and which penetrate axially into the windows in the target,
• the bipolar ring being axially magnetized such that the teeth have a first polarity and the second axial side has a second polarity which is opposite the first polarity.