Main reduction nonlinear elasticity separation sleeve

The utility model discloses a main reduction nonlinear elasticity separation sleeve, which comprises a metal cylinder body (6) with a certain thickness. The inner diameter and the outer diameter of an upper portion the metal cylinder body(6a) are smaller than those of a lower portion metal cylinder body (6b), the diameters of the inner wall and the outer wall of a middle conical cylinder body (6cd1) both change, and accordingly the portion of the conical cylinder body can bear strong elastic deformation. By means of the nonlinear elasticity separation sleeve, appropriate pretension can be adjusted in self-adaptation mode without repeatedly adding gaskets to adjust to appropriate pretension, thereby simplifying structure of a main speed reducer, improving production efficiency, reducing labor intensity, being capable of relaxing relative allowance in assembling dimension chains, and facilitating processing economical efficiency.