| 摘要 |
PURPOSE: To attain high accuracy by a simple structure and realize a low price by providing a structure wherein an outer race ring has a circumferential depression between ball rows and an inner race ring has a radially outward circumferential curved portion on each of two axial sides of the ball rows. CONSTITUTION: An outer race ring 2 has a circumferential depression 5 between two rows of balls 3, 4 and the other parts thereof form a tubular shape. On the other hand, an inner race ring 1 is formed to a tubular shape with a radially outward circumferential curved portion on either axial end. Consequently, a high accuracy can be obtained by a simple structure, and the manufacture cost can be reduced to provide a low price.
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