SELF-BRAKING SCREW JACK WITH AXIAL ELECTRIC MOTOR

摘要

FIELD: instrument making.;SUBSTANCE: invention relates to screw jacks and serves for cargo lifting and lowering with an automatic stop and latching after disconnection of supply voltage. Self-braking screw jack comprises electric motor, casing of which is connected to hollow cylindrical post reinforced by radial brackets, screw with non-rotating head, nut, bearings. Electric motor is axial asynchronous single-stator and single-rotor, its housing consists of upper and lower bearing shields, fixed to each other, with the inner end side of lower bearing shield the stator magnetic core is fixed, and the rotor consists of rotor magnetic conductor and base, rigidly connected to each other and forming a circular disk, base of which is coupled with a nut by means of spline joint to allow axial displacement between the ledge and the brake lining. Ledge is made on the lower part of the nut, and its diameter is increased value relative to the diameter of the spline joint, and the brake pad is fixed on the brake disc rigidly mounted on the inner end side of the upper bearing shield. Nut is connected with screw by screw joint and is located in the upper and the lower bearing shields with the help of the bearings, on the external part of the ledge the brake spring is mounted, located between the lower end side of the base of the rotor disc and the collar made on the lower part of the ledge.;EFFECT: technical result is in increasing lifting power, possibility of the automatic stop and fixing the position of the screw when supply voltage is deactivated on the excitation winding and expansion of high-rise limits of jack is performed.;1 cl, 1 dwg