The invention concerns an instrumented antifriction bearing device,
provided with a non-rotating part including a non-rotating ring and sensor
element, a rotating part including a rotating ring and encoder, and at
least a row of rolling bodies arranged between two raceways of the
non-rotating and the rotating rings. The non-rotating sensing element and
the rotating encoder form an assembly detecting rotation parameters. The
device includes a maintenance device for temporarily maintaining the
angular indexing of the encoder relative to the sensing element in an
angular position, wherein the encoder generates in the sensing element a
reference signal. The maintenance device temporarily maintains the angular
indexing device in position until released, as for example, by the axial
displacement of at least part of an element of the device towards the row
of rolling bodies.
