| 摘要 |
The bearing (1) has two rows of rollers (5) contained in cages (6), comprising one fixed (4) and two rotating (2,3) rings. A rotational speed detector comprises a sensor (11) fixed to the non rotating ring, with an encoder (14) just embedded in the rotating rings. This produces an alternating signal, with frequency proportional to rotational speed. The encoder radial part between the cages, supports its active part. This is in an annular space between the fixed ring annular surface separating the bearing tracks and the cage external surface between the two rows of rollers. The active part axial dimension is greater than the residual axial space between the two cages. The active encoder part may be an elastomer ring loaded with magnetic particles.
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