Harmonic geared reduction unit

The utility model relates to a special harmonic gear speed reducer for a jigger, which can be used for the major repair of a steam turbine in a power plant. The utility model is an improved type machine of a planet gear speed reducer. A machine body and an output wheel are matched by a concave-convex structure. Thus the volume of the speed reducer is greatly reduced, and the weight of the speed reducer is reduced. Meanwhile, a cycloidal gear, a gear pin, a pin, etc., are cancelled, new parts, such as a rigidity gear, a flexible gear, a rigidity ring, etc., are used. Consequently, the working performance of the special speed reducer for the jigger of the turbine is improved. Thus, the utility model is an ideal special jigger machine when the turbine in the power plant is in the major repair.