| 摘要 |
A projection 5 is formed in ring shape at a side facing outside of a circular arc face 3 at the front end portion of a sealing lip L, the projection being to contact a frank face in a progressing side of the screw shaft. If the seal for ball screw is attached to the nut end portion, rigidity effecting along the lip thickness is reinforced by the projection 5, to subsequently prevent turnover easily happening hitherto in a steeply oblique part of the frank face of a progressing side. At this steeply oblique part, a double sealing function is exhibited by contacting the circular arc face 3 at the front end portion of the sealing lip L and the projection 5 at the side facing outside to this part.
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