| 摘要 |
An open end of a sleeve (spline-fitted to a male yoke) remote from a connecting portion of the male yoke is closed by a first lid member. A through hole is formed axially through the male yoke, and includes a cylindrical first passage portion, and a cylindrical second passage portion which is disposed at that side of the first passage portion close to the first lid member and is smaller in inner diameter than the first passage portion. A second lid member is disposed to close that open end of the through hole remote from the first lid member. Air vent holes are formed through the second lid member to extend in an axial direction, and are disposed so as to partially overlap with a portion of an inner peripheral surface of the first passage portion in the axial direction.
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