Wide-temperature-range high-precision shafting structure

The invention aims at providing a wide-temperature-range high-precision shafting structure so as to solve the problems that when an existing incubator rotary table shafting is in the temperature environment of -55 DEG C-120 DEG C, gaps of all parts of the shafting are reduced due to thermal expansion and cold contraction of metal materials, bearing pre-tightening is too large, the shafting is blocked, and angle measurement is difficult. A wide-temperature-range high-precision shaft comprises a direct-current torque motor assembly (1), an angular contact ball bearing assembly (2), a right shaft(3), a middle ring frame (4), an inner ring frame (5), an angle measuring support (6), a circular inductosyn angle measuring assembly (7), a left shaft (8) and a locking nut (9). The wide-temperature-range high-precision shafting is high in rotation precision and low in manufacturing cost, the phenomenon that the shafting is blocked in high-temperature and low-temperature environments can be effectively avoided, and shaf