ELECTRIC DRIVE Russian patent published in 1997 - IPC

FIELD: enclosed electromechanical linear actuators. SUBSTANCE: electric drive is combination of electric motor, of screw-type rotary-to-translational movement converter, and folding hermetically sealed shielding casing 10 of screw 7. Converter nut 6 has axial through channel 11. Hollow shaft 3 of motor may also have through axial channels where it abuts against nut and through radial channels on either side of rotor. These channels are provided with pneumatic check valves 13, 14, 15 opening into motor. End shield 5 on side of shielding casing 10 may be provided with through axial channels with pneumatic check valves open in motor direction towards shielding casing. EFFECT: improved specific power characteristics due to more efficient cooling conditions. 2 cl, 1 dwg