Abstract: 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.

Abstract: The invention concerns an instrumented antifriction bearing device, provided with a non-rotating part comprising a non-rotating ring (2) and sensor means (14), a rotating part comprising a rotating ring (1) and encoding means (16), and at least a row or rolling bodies (6) arranged between two raceways of the non-rotating (2) and the rotating (4) rings. The non-rotating sensing means (14) and the rotating encoding means (16) form an assembly detecting rotation parameters. The device comprises means for temporarily maintaining the angular indexing of the encoding means (16) relative to the sensing means (14), in an angular position wherein said encoding means (16) generates in the sensing means (14) a reference signal, the means temporarily maintaining the angular indexing means being released by the axial dispalcement of at least part of an element of the device towards the row of rolling bodies.