Tangential feeding to a threshing rotor

An agricultural combine harvester comprising:

• a rotor,
• a rotor cage surrounding the rotor,
• a threshing space defined between the rotor cage and the rotor,
• a transition section defining an infeed to said rotor cage, the transition section disposed at a location upstream of the rotor cage, as viewed in a direction of crop flow through the combine harvester, the transition section having an inlet for receiving the crop material, and
• a crop conveying drum for conveying crop material to the inlet of the transition section and beneath the rotor, the drum being at least partially encased by a shroud,
• wherein the transition section comprises a bottom wall, two side walls each having portions extending substantially vertically with respect to the bottom wall, curved side walls each extending between the bottom wall and one of the side walls, and a conical top wall extending between and connecting the curved side walls, the bottom wall being substantially tangential to a lower portion of the shroud located beneath the drum.