words of similar import a first embodiment of a subassembly 20 of the invention is shown in fig1 in which all component parts are represented apart the subassembly 20 includes an indexing gear 21 a coupling body 22 as well as a friction ring 23 this multipart construction of the subassembly 20 makes a selection of materials possible which is adapted to the respective needs or standards of the individual parts at the same time divergent procedures for manufacturing these component parts can be used owing to the different geometrical configurations of the individually constructed parts the completed subassembly 20 is depicted in fig2 and include the indexing gear 21 the coupling body 22 and the friction ring 23 which has a conical friction area 28 for form locking assembly of these parts the indexing gear 21 is provided with an axially projecting rim 24 as well as with a shoulder 25 on which the coupling body 22 is centered and experiences an axial limit as it seats against the shoulder in the area of an internal diameter of the coupling body 22 several notches 26 are provided which are distributed on the periphery into which the axially projecting pegs 27 of the friction ring 23 are inserted whereby the pegs 27 are at the same time centered on the rim 24 of the indexing gear to ensure an inseparable connection of all construction parts of the subassembly 20 these parts are preferably welded in the area of the rim 24 the.