| 摘要 |
FIELD: machine building.SUBSTANCE: mechanism includes an external cylindrical housing with an internal screw raceway, an internal cylindrical housing, an actuating mechanism, a supporting mechanism and a control device. The actuating mechanism includes a drive shaft with an electric motor, a nut and a nut installation mechanism. The actuating mechanism provides sliding of the above cylindrical housings relative to each other. The nut is installed on a drive shaft and performs rotational and translational movement inside the external housing and includes a screw rolling channel passing around the nut on one side, and a recirculation zone on the other side. Balls are located in the recirculation zone between the nut rolling channel and the raceway. The supporting mechanism consists of a support connected to the shaft and is borne against the raceway; there is a screw thread around the support. The control device for the supporting mechanism includes a mechanism for application of pre-stress to the nut. The control device is designed so that it can retain the supporting mechanism in non-operating and operating positions. In the non-operating position there is a gap between the supporting mechanism and the raceway. Changeover to the operating position on the raceway occurs under action of the axial stress applied to the actuating mechanism, which is higher than threshold stress.EFFECT: improving durability of a device.14 cl, 5 dwg |
