Abstract. The article presents options for extension circuits with gears with the recommended content. A new formula for determining the degree of freedom of gears has been proposed. Here’s how to eliminate redundant connections in an extension. The results of the calculation of the shear deformation of the rubber bushing of the elastic element of the gear are given. The results of the recommended transmission production tests are given.

Keywords: Gear, extension, flexible element, structure, degree of freedom, plus coupling, shear modulus, deformation, test, efficiency, resource.