SPEED GEAR-BOX Russian patent published in 2001 - IPC

FIELD: mechanical engineering. SUBSTANCE: speed gear-box may be used for adjustment of speed of metal-cutting machine spindles. It is used to provide for optimal cutting mode. Gear-box has three electric motors 1, 2, 3 and two planetary gearings 4, 5. Electric motor shaft is connected rigidly to sun gear 6 of gearing 5. Electric motor 2 has hollow shaft which is coupled to carrier 7. Epicycle shaft 8 of gearing 5 is passed inside hollow shaft of electric motor 2. Said shaft is in its turn fixed to carrier 9 of gearing 4. Electric motor 3 also has hollow shaft which is connected rigidly to sun gear 10 of gearing 4. Epicycle shaft 11 fixed to machine spindle is passed inside hollow shaft of electric motor 3. Brakes 12, 13, 14 are mounted on shafts of electric motors 1, 2, 3. EFFECT: simplified construction. 1 dwg