| 摘要 |
<p>A washer (30) is disposed between a lid part (18) of a cup (11) and an end surface of a shaft portion (15) of a cross-shaped shaft (10) so as to be relatively rotated with respect to the end surface of the shaft portion. The washer is provided with a projected portion (41) which is projected into a recess (33) formed on the end surface of the shaft portion. Blade portions (59,60) are formed on an outer surface of the projected portion. Grooves (57) which are extended from the projected portion outward in a radial direction are formed on an end surface of the washer only at a side of the projected portion in the axial direction.
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