A combine harvester including one or two axial flow crop processors each with a rotor mounted for rotation inside a rotor housing that is arranged substantially longitudinally with respect to the harvester. A feed beater is mounted for rotation on a substantially transverse axis and serves to tangentially impel crop material into the crop processor(s). A drive system is provided for driving the rotor and the feed beater. A drive connection is provided between the rotor and the feed beater and includes a gear that is keyed to a rotor shaft of the rotor in front of a rotor drum.

A threshing system for a combine harvester has first to fourth drums, with a concave beneath the first drum and first and second grates for the second and third drums. The second grate has an engaged position beneath the third drum, and it can be driven from the engaged position, around the third drum, to a disengaged position over the third drum. During this disengagement, a space adjustment system moves the fourth drum to increase a space between the third and fourth drums to enable the second grate to pass through the space.

A threshing system for a combine harvester has first to fourth drums, with a concave beneath the first drum and first and second grates for the second and third drums. The second grate has an engaged position beneath the third drum, and it can be driven from the engaged position, around the third drum, to a disengaged position over the third drum. During this disengagement, a space adjustment system moves the fourth drum to increase a space between the third and fourth drums to enable the second grate to pass through the space.

The self-propelled combine harvester comprising an internal combustion engine and at least a first electric machine, mechanically connected to the internal combustion engine and adapted to convert mechanical power generated by the internal combustion engine into electrical power. There is also provided a storage system for energy generated by the first electric machine. A first continuously variable mechanical transmission connects the internal combustion engine to a first functional unit and is combined with a second electric machine configured to operate at least in motor mode and electrically connected to the storage system to receive electrical energy from the storage system. A control unit of the combine harvester is configured to control the first electric machine and the second electric machine as a function of an operating parameter of the first functional unit.

The self-propelled combine harvester comprising an internal combustion engine and at least a first electric machine, mechanically connected to the internal combustion engine and adapted to convert mechanical power generated by the internal combustion engine into electrical power. There is also provided a storage system for energy generated by the first electric machine. A first continuously variable mechanical transmission connects the internal combustion engine to a first functional unit and is combined with a second electric machine configured to operate at least in motor mode and electrically connected to the storage system to receive electrical energy from the storage system. A control unit of the combine harvester is configured to control the first electric machine and the second electric machine as a function of an operating parameter of the first functional unit.