COMBINED-TYPE TWO-STAGE SPEED REDUCER

The present invention relates to a combined-type two-stage speed reducer, comprising a base body, an input wheel, an output wheel and a first gearing-down structure. A driving mechanism comprises at least two independent driving members, wherein the driving members are connected to the input wheel by means of a second gearing-down structure, the input wheel and the output wheel are provided with gear rings which receive power by means of meshing structures, respectively, and a plurality of teeth are detachably assembled to form a corresponding gear ring. In the present invention, the plurality of teeth are combined into a complete gear ring by means of splicing, and the input wheel and the output wheel receive power from upstream by means of the meshing structures, respectively; teeth of a gear ring structure are detachable by means of splicing, a special large gear making apparatus is not needed, and a large or ultra-large speed reducer can be manufactured by using a general apparatus, thereby facilitating m