Quiet dynamic pressure main shaft

The utility model discloses a quiet dynamic pressure main shaft, including the main shaft body and main shaft, and an antifriction bearing, first quiet dynamic pressure, the quiet dynamic pressure of second and the 2nd antifriction bearing, the hydraulic pressure oil groove that the twice annular has a perfect understanding is each other all driven to first quiet dynamic pressure and the quiet dynamic pressure's of second lateral part surface, and a plurality of wedge oil pockets have all been opened to the lateral part internal surface, and a plurality of wedge oil pockets all feed through with the hydraulic pressure oil groove, the internal oil feed that is provided with of main shaft is said and is gone out the oil duct, it says that interior pressure is oily to get into the oil feed, get into first quiet dynamic pressure and the quiet dynamic pressure of second from the hydraulic pressure oil groove, and spill over from the exact fit interfacial crack of first quiet dynamic pressure and the quiet dynamic pressure of second and main shaft and become low pressure oil, low pressure oil gets into out the oil duct and carries out the sufficient lubrication to an antifriction bearing and the 2nd antifriction bearing, can guarantee that the main shaft is rising, stop, the main shaft does not overlap the contact friction with quiet dynamic pressure when oil circuit trouble and overload, the fail safe nature of main shaft operation has been improved.