A combine harvester including at least one straw walker extending in a longitudinal direction of the harvester and supported by a front and rear shaft. The shafts are rotatable about respective rotation axes, and each shaft provided with one or more eccentric portions. The straw walker is rotatably mounted on an eccentric portion of the respective front and rear shafts, so that the simultaneous rotation of the shafts actuates a reciprocating motion of the straw walker. The combine further comprises a pivot frame and one or more actuators, configured to adjust the angular position of the frame by pivoting the frame about a pivot axis oriented transversally to said longitudinal direction. The front and rear shafts are configured to rotate with respect to the pivot frame, so that the straw walker's angular position is adjustable while the straw walker executes said reciprocating motion.

A topshaft rotary antiwrap assembly includes a topshaft assembly having (i) a shaft configured for rotating about a rotation axis, and (ii) one or more sprockets mounted to the shaft concentrically to the rotation axis to move in a rotation direction about the rotation axis. The topshaft rotary antiwrap assembly also includes a first scraper body located adjacent to the topshaft assembly and has: a first sprocket scraper located adjacent to an outer perimeter of a first sprocket of the one or more sprockets and radially aligned with the first sprocket relative to the rotation axis. The first sprocket scraper includes a respective sprocket scraper body that extends from a leading edge to a trailing edge. The trailing edge is offset from the leading edge along the rotation axis such that the sprocket scraper body directs a respective adjacent portion of crop material at least partially along the rotation axis.

A topshaft rotary antiwrap assembly includes a topshaft assembly having (i) a shaft configured for rotating about a rotation axis, and (ii) one or more sprockets mounted to the shaft concentrically to the rotation axis to move in a rotation direction about the rotation axis. The topshaft rotary antiwrap assembly also includes a first scraper body located adjacent to the topshaft assembly and has: a first sprocket scraper located adjacent to an outer perimeter of a first sprocket of the one or more sprockets and radially aligned with the first sprocket relative to the rotation axis. The first sprocket scraper includes a respective sprocket scraper body that extends from a leading edge to a trailing edge. The trailing edge is offset from the leading edge along the rotation axis such that the sprocket scraper body directs a respective adjacent portion of crop material at least partially along the rotation axis.

A threshing apparatus for an agricultural harvester has an axial threshing rotor driven by a power unit from its rearward end. The axial threshing rotor is connected at its forward end to a dynamic feed roll through a drive train including a drive connected to the axial threshing rotor and having an output shaft extending to a side of the dynamic feed roll where it is connected by either a gear set or a pulley drive.

A threshing apparatus for an agricultural harvester has an axial threshing rotor driven by a power unit from its rearward end. The axial threshing rotor is connected at its forward end to a dynamic feed roll through a drive train including a drive connected to the axial threshing rotor and having an output shaft extending to a side of the dynamic feed roll where it is connected by either a gear set or a pulley drive.

The combine harvester includes a cleaning system including a sieve assembly coupled to a drive mechanism for actuating a fore-aft shaking movement of one or more components of the sieve assembly. The combine further includes a tailings return system including a transversal tailings return auger and an inclined tailings elevating auger. The combine includes a power transmission for driving the tailings return augers. The transmission includes a first belt transmission and a first and second gear transmission, configured to transmit power from a transversal drive shaft of the harvester to the two tailings return augers. The first gear transmission is a planar gear transmission. The output axle of the first gear transmission also drives a belt transmission configured to drive the fore-aft shaking movement of the sieve assembly and the rotation of a clean grain auger of the harvester.

The combine harvester includes a cleaning system including a sieve assembly coupled to a drive mechanism for actuating a fore-aft shaking movement of one or more components of the sieve assembly. The combine further includes a tailings return system including a transversal tailings return auger and an inclined tailings elevating auger. The combine includes a power transmission for driving the tailings return augers. The transmission includes a first belt transmission and a first and second gear transmission, configured to transmit power from a transversal drive shaft of the harvester to the two tailings return augers. The first gear transmission is a planar gear transmission. The output axle of the first gear transmission also drives a belt transmission configured to drive the fore-aft shaking movement of the sieve assembly and the rotation of a clean grain auger of the harvester.

The combine harvester includes a grain cleaning section and a grain elevator, the cleaning section including one or more clean grain augers configured to deliver clean grains into the grain elevator. The harvester further includes a rotatable drive axle and a transmission system coupled thereto so that the drive axle drives the one or more augers as well as the elevator. The transmission system includes a reversible decoupler mechanism configured to decouple the one or more clean grain augers from the drive axle while not decoupling the elevator from the drive axle. These features enable removing a blockage from the grain elevator, by decoupling the one or more clean grain augers and then activating the elevator to remove the blockage, followed by the re-coupling of the one or more augers.

The combine harvester includes a grain cleaning section and a grain elevator, the cleaning section including one or more clean grain augers configured to deliver clean grains into the grain elevator. The harvester further includes a rotatable drive axle and a transmission system coupled thereto so that the drive axle drives the one or more augers as well as the elevator. The transmission system includes a reversible decoupler mechanism configured to decouple the one or more clean grain augers from the drive axle while not decoupling the elevator from the drive axle. These features enable removing a blockage from the grain elevator, by decoupling the one or more clean grain augers and then activating the elevator to remove the blockage, followed by the re-coupling of the one or more augers.

An agricultural vehicle has an engine, a threshing rotor, and a rotor drive system including a planetary gear assembly and a fluid circuit for driving the rotor at a constant acceleration during a start-up procedure of the rotor.