| 摘要 |
<p>The invention provides a nut and screw arrangement of the type suitable for converting rotary into linear motion or vice-versa. The nut (2) is made up of two or more circumferentially spaced segments (3) which are each radially movable. Each segment (3) is biased radially inwardly, onto the screw (1), by two sliding cam bodies (or other means) (6, 7), which may be common to all of the segments or be provided for each segment separately. The cam bodies (6, 7) bear on cam surfaces (4, 5) of the corresponding nut segments (3) and are preferably in the form of wedges acting on tapered surfaces of the segment to bias it inwardly. The sliding cam bodies (6, 7) are biased in opposite axial directions, for instance away from each other by a biasing means (8) extending between them. With the present invention, each segment (3) is urged radially inwards due to the action of the biasing means (8) to compensate both for backlash and long term wear.</p> |
