| 摘要 |
The hub portions of a field generating means and of an Eddy current developing means form an annular space in which a ball bearing is located. Two sealing rings are provided in the annular space on opposite sides of the ball bearing and form on one side of the same, a storage chamber filled with a lubricating grease for the ball bearing. Each sealing ring is attached to one hub portion and having parallel annular grooves. Stacks of annular metal laminations are respectively located in the grooves, and attached to the other hub portion. The laminations have lateral annular surfaces abutting each other.
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