| 摘要 |
PURPOSE:To enable the amount of abrasion to be reduced, by providing convex spherical surfaces having two kinds of radii of curvature on a thrust pad, so that the contact surface pressure between the thrust pad and the end surface of a shaft body can be reduced. CONSTITUTION:A thrust pad 22, being in a spherical shape, has a first convex spherical surface 42 on the fitting surface to be engaged with a sleeve. In the thrust pad 22, the surface facing to a shaft body 10 has a second convex spherical surface 44 whose radius of curvature R is greater than the radius of curvature r of the first convex spherical surface 42, on its radial-directional central part. And, the second convex spherical surface 44 is opposite to the end surface 12 of the shaft body which keeps a flat surface when it is rotated. Accordingly, the contact surface pressure between the thrust pad 22 and the end surface 12 of the shaft body is reduced, thus the amount of abrasion can be significantly reduced.
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