Step-down or step-up gear train using an internally-toothed planetary gearing structure

摘要

The step-down or step-up gear train comprises a first shaft, an eccentric element on this first shaft, a gear wheel with external toothing located on the outer periphery of the said eccentric element, and a gear wheel with internal toothing which meshes internally with the gear wheel with external toothing, as well as means capable of withstanding the pivoting of the gear wheel with external toothing. It includes, on the gear wheel with external toothing 103, a plurality of internal stubs 103b projecting at locations placed on a circumference coaxial with the said first shaft 101, and the second shaft 106 of annular shape has internal holes 106a in each of which one of the said stubs of a plurality of internal peg stubs 103b becomes respectively housed, with clearance, and is also equipped with toothing 106b at its periphery; power is output through a cut-out part B. Application to the particularly compact step-down gear trains. IMAGE