Combine harvester for harvesting grain crop, has conveyor device provided screw, where thresh effective surface of screw together with wall of channel limits wedge-shaped interspace that is broadened in conveying direction of screw

The harvester (1) has a screw conveyor device provided with a conveying channel (22), and a rotationally driven screw (3) extending in the conveying channel. A thresh effective surface of the screw together with a wall of the conveying channel limits a wedge-shaped interspace that is broadened in a conveying direction of the screw, where the effective surface includes a sharp edge turned towards the wall of the conveying channel. The effective surface forms an outside edge of spirals of the screw, and is arranged in an interspace between two windings of the spirals. Eine Schneckenfördereinrichtung eines Mähdreschers umfasst einen Förderkanal (22) und eine sich in dem Förderkanal (22) erstreckende drehantreibbare Schnecke (23). Eine dreschwirksame Oberfläche (26, 32, 33) der Schnecke (23) begrenzt zusammen mit einer Wand (25) des Förderkanals (22) einen keilförmigen, sich in Förderrichtung der Schnecke (23) verbreiternden Zwischenraum (27).