| 摘要 |
<p>A seal member (60) is a single-piece member having a fitting cylindrical portion (61) that is formed by pressing a thin steel plate and that is press-fitted to an outer peripheral surface of one end portion of an inner ring (40), an annular portion (62) that extends radially inward from one end portion of the fitting cylindrical portion (61) along an outer side surface of an inner ring rib (42), and a cylindrical seal portion (63) that protrudes from a radially inner end of the annular portion (62) along a radially inner end surface of the outer ring rib (35) with a small gap left between the cylindrical seal portion (63) and the radially inner end surface of the outer ring rib (35), and that constitutes a labyrinth in cooperation with the radially inner end surface of the outer ring rib (35). The radially inner end surface of the outer ring rib (35) has an inclined surface (38) or a curved surface having a diameter that gradually increases outward from a portion that constitutes the labyrinth.</p> |
