| 摘要 |
A ball screw mechanism is used for linear movement of a first element against a second element. A claimed arrangement for preventing back rotation of the screw (16) on application of a clamping load on both elements comprises: i) a ball screw (16) and associated collar (14), one of which is fixed while the other rotates against the axial force of a spring (18); ii) a supporting platen (13) for the rotating screw (16); iii) a drive unit (15) for screw rotation; iv) a blocking member (17) which is initially separated from the supporting platen (13) by a gap (b) through the force of the spring (18). When clamping load is applied the drive unit (15) continues to operate to prevent back rotation of the screw (16) until the reaction force caused by clamping load application overcomes the spring (18) force and the blocking member (17) and supporting platen (13) contact each other. |
