| 摘要 |
The invention discloses a non-reversing device for a screw-nut type driving system, comprising on the screw shaft (1) a flange (11) against at least one surface of which an annular friction disk (12), a ratchet free wheel (13) blocked in one rotation direction by a pawl, at least one running gear with axial stop (14), and at least one preload spring can rest axially, in the order indicated. In this device the friction disk (12) is locked in rotation with respect to the flange (11), preferably by a portion other than its radially internal circumference, for instance by means of an external ring (24). Disk friction and wear (12) occur on a single face, i.e. that in contact with the ratchet wheel (13) and the flange (11) connecting radius and which is not reduced by the centering of the friction disk (12).
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