A radial piston engine is disclosed with cylinder/piston units which are arranged in a star shape, a housing and an output shaft. At least sections of a brake, in particular the discs thereof, are arranged between an inner axial sleeve-like collar of the housing and an outer axial sleeve-like collar of the output shaft. An output flange, for example for fastening a wheel which is driven by the engine, is fastened to the output shaft. The output flange is fastened to the axial shaft collar radially outside the latter. The output flange can have a ring of holes which is correspondingly likewise arranged on the axial shaft collar radially outside the latter.