| 摘要 |
<p>A roller bearing of the type having a flange on which thrust loads are received which shows improved ability to form an oil film at the contact portion between the end surface of a roller and the flange. The roller (3) has an annular guide surface portion (8) which can contact the flange (6), and which is inclined obliquely, with respect to the direction perpendicular to the center axis of the roller, in the thrust direction toward the longitudinal center of the roller, from its edge (E1) near the roller center axis to its edge (E2) near a raceway (4), whereby the circumference of the annular guided surface portion whose center lies on the center axis of the roller is small. The flange (6) has an annular guiding surface (9) which can contact the annular guided surface portion (8), and which is inclined obliquely with respect to the radial direction and outwardly of the bearing with respect to the thrust direction, from its edge (E3) near the raceway (4) to its edge (E4) near the roller center axis, whereby the circumference of the annular guiding surface whose center lies on a center axis of the bearing changes. The annular guiding surface (9) has a flange angle (¸i) which is an acute angle between a radial straight line and the straight line passing through the edges (E3 and E4) of the annular guiding surface. The annular guided surface portion (8) has a roller end surface angle (¸r) which is an acute angle between a radial straight line and the straight line passing through the edges (E1 andE2) of the annular guided surface portion. The flange angle (¸i, ¸o) and the roller end surface angle (¸r) are both not less than 0.1° and not more than 1.5° over the entire circumferences of the annular guiding surface and the annular guided surface portion.</p> |
