Novel high speed shaft

The utility model provides a novel high speed shaft which meets the high rotation speed requirements of a main shaft. According to the following technical schemes adopted by the utility model, the novel high speed shaft is composed of a main shaft (1), bearings (2), shaft shells (3), bearings (4), split type reduction sleeves (5) and shaft shell connecting sleeves (6), wherein the main shaft (1) is provided with two sets of bearings (4), and the outer diameters of the bearings (4) are matched with of the inner diameters of the split type reduction sleeves (5); the two ends of the outer diameters of the split type reduction sleeves (5) are respectively provided with the bearings (2) the type of which is same as that of the bearings (2), the outer diameters of the bearings (2) are matched with the inner diameters of the shaft shells (3), and the two end shaft shells (3) are fixedly connected with the shaft shell connecting sleeves (6) through bolts. The novel high speed shaft provided by the utility model has t