Rotary transmission leadthrough

The invention relates to a rotary transmission leadthrough for the admission of a liquid to the cutting edges of tools of heading and winning machines for mining or tunnelling, consisting of a stator connected to a liquid feed and a rotor surrounding the stator at its front end and having several outlets for spraying the cutting edges of the tools, the stator and rotor being connected to one another via passages or the like for the passage of the liquid, and at least one radially arranged passage of the stator being allocated to the outlets of the rotor, which passage leads into an axially running passage of the stator. In order to create a rotary transmission leadthrough of the aforesaid type which is simple to manufacture and assemble, has a long service life and in addition enables the cutting edges of tools of the associated machine to be sprayed in sectors, it is proposed according to the invention that the rear end (5) of the stator (1) be coupled to a swivel drive (10) and that the front end (3) of the stator (1) surrounded by one or more annular rotors (6) be provided with one or more annular grooves (13) in its circumferential surface in the area of the outlets (7) of the rotor (6) or rotors (6), which annular grooves (13) extend over part of the periphery of the stator (1).