Abstract: A roller reducer comprises: an input member, a support member, an output member, and rollers, wherein the output member comprises output member nuts having a number of thread starts different from the number of thread starts on the support member nuts, wherein the rollers are arranged around the at least two support member nuts and the at least two output member nuts in such manner that each roller portion out of at least one pair of roller portions engages at least one of at least one of the support member nuts and at least one of the output member nuts.

Abstract: The invention relates to planetary mechanisms for transmitting rotational movement. Particularly, the invention relates to planetary reducers having stepped threaded rollers. More particularly, the invention relates to roller reducers.

Abstract: The provided apparatus for automated nondestructive inspection of a metal structure having a surface comprises an ultrasonic nondestructive inspection unit, a nondestructive inspection unit based on magnetic flux leakage method, an eddy-current nondestructive inspection unit, a control unit connected to the ultrasonic nondestructive inspection unit, the nondestructive inspection unit based on the magnetic flux leakage method and the eddy-current nondestructive inspection unit for sending control signals to carry out inspection of the metal structure, and a navigation unit connected to the control unit, wherein the navigation unit determines a position of said apparatus relative to the metal structure, determines a state of the surface of the metal structure and sends signals into the control unit. The nondestructive inspection unit based on magnetic flux leakage method changes a magnetic field induction generated by this unit from a minimum value close to zero value to a predetermined maximum value.

Abstract: The provided apparatus for automated nondestructive inspection of a metal structure having a surface comprises an ultrasonic nondestructive inspection unit, a nondestructive inspection unit based on magnetic flux leakage method, an eddy-current nondestructive inspection unit, a control unit connected to the ultrasonic nondestructive inspection unit, the nondestructive inspection unit based on the magnetic flux leakage method and the eddy-current nondestructive inspection unit for sending control signals to carry out inspection of the metal structure, and a navigation unit connected to the control unit, wherein the navigation unit determines a position of said apparatus relative to the metal structure, determines a state of the surface of the metal structure and sends signals into the control unit. The nondestructive inspection unit based on magnetic flux leakage method changes a magnetic field induction generated by this unit from a minimum value close to zero value to a predetermined maximum value.

Abstract: The present invention relates to an electromechanical actuator comprising a housing, an electric motor, a roller drive and a rotor rotation angle sensing unit received in said housing. The rotor of the electromechanical actuator is mounted within the housing and configured to rotate in bearing supports. Openings for supplying and removing lubricant are arranged in the housing in the vicinity of the bearing supports, the opening allowing to replace lubricant without disassembling the actuator, thus simplifying maintenance and operation.

Abstract: The present invention relates to a roller reducer comprising a transmission gear having an externally threaded shaft having at least one left-handed thread portion, at least one right-handed thread portion, and at least one shaft flange ring, and a plurality of rollers, each roller having a plurality of thread portions, comprising at least one left-handed thread portion and at least one right-handed thread portion, each thread portion arranged to engage with the respective thread portions of the shaft, and at least one roller flange ring arranged adjacent to the roller thread portions to rotationally slide against the corresponding at least one flange ring of the shaft. Diameters of the flange rings of the rollers and the flange rings of the shaft are each equal to the respective effective thread diameters of the engaged thread portions of the rollers and the shaft, respectively.

Abstract: The present invention relates to a roller reducer comprising a transmission gear having an externally threaded shaft having at least one left-handed thread portion, at least one right-handed thread portion, and at least one shaft flange ring, and a plurality of rollers, each roller having a plurality of thread portions, comprising at least one left-handed thread portion and at least one right-handed thread portion, each thread portion arranged to engage with the respective thread portions of the shaft, and at least one roller flange ring arranged adjacent to the roller thread portions to rotationally slide against the corresponding at least one flange ring of the shaft. Diameters of the flange rings of the rollers and the flange rings of the shaft are each equal to the respective effective thread diameters of the engaged thread portions of the rollers and the shaft, respectively.

Abstract: The present invention relates to an electromechanical actuator comprising a housing, an electric motor, a roller drive and a rotor rotation angle sensing unit received in said housing. The rotor of the electromechanical actuator is mounted within the housing and configured to rotate in bearing supports. Openings for supplying and removing lubricant are arranged in the housing in the vicinity of the bearing supports, the opening allowing to replace lubricant without disassembling the actuator, thus simplifying maintenance and operation.

Abstract: An electromechanical driving actuator with a damping device comprises an electric motor (26) comprising a stator (9) and a hollow rotor (3), the stator (9) enclosing the rotor (3) and the rotor having a base end and an operational end. The electromechanical actuator further comprises a retractable shaft (4) having a cavity and mounted coaxially with the rotor (3) in such a manner that an end portion of the retractable shaft (4) is arranged in the cavity of the rotor, the shaft's end portion being formed as a tubular member (8) having a bottom end and an operational end.

Abstract: A valve drive for actuating a valve comprises a main motor, a main shaft, a transmitting device comprising a nut and a spindle and adapted to transform rotational movement of the nut into a translational movement of the spindle, and driving means adapted to move the spindle, wherein the main motor is adapted to transfer rotation to the nut via the main shaft, and the spindle is adapted to open and close the valve during the translational movement of the spindle. The valve drive for actuating a valve further comprises a differential mechanism mounted between the main motor and the main shaft, said differential mechanism comprising a first input shaft connecting the differential mechanism to the main motor, and a second input shaft. The output shaft of the differential mechanism is the main shaft.

Abstract: The object of the present invention is to provide a risk monitoring device and a risk monitoring method for use with a nuclear power facility, providing continuous determination of risk associated with the nuclear power facility, based on one-type security model, which can be implemented using simple software and hardware means.