A cleaning system for a combine harvester includes a fan, at least one duct having an interior passageway that is positioned to receive an air stream from the fan, and a surface defined within the interior passageway of the at least one duct that is configured to restrict a volume of the flow of air passing through the at least one duct and increase a pressure of the air stream passing through the duct.

A charge fan assembly is located behind the forward operator cab and draws air from about the top of the PPU and a portion of an airflow from the charge fan assembly is directed downwardly into the crossflow cleaning fan assembly. A pair of closely spaced-apart sheets create a venturi and speed up the charge fan airflow into the crossflow cleaning fan and impact the crossflow cleaning fan at an angle where the blades of the crossflow cleaning fan are widely open. The exhaust air from the crossflow cleaning fan is nearly the same across the entire lengthwise extent of the crossflow cleaning fan.

A fan assembly for a cleaning system of a combine harvester includes a housing having a plurality of interconnected walls. The interconnected walls include at least two side walls and a lower wall connecting the two side walls, and at least one partition positioned between the side walls. The partition promotes uniform air flow across a width dimension of the fan assembly. The interconnected walls define at least one inlet opening through which air is delivered into the housing and at least one outlet opening through which air is exhausted from the housing. A fan rotor is mounted to the housing and is configured to rotate to distribute air from the inlet opening to the outlet opening.

A grain harvesting vehicle is configured to harvest a grain. A chaffer is configured to separate grain from material other than grain (MOG). A grate is positioned rearward of the chaffer. The grate includes a grate panel having an upper surface and a lower surface and an aperture in the grate panel extending between the upper surface and the lower surface. The aperture has a first end nearer the chaffer and a second end opposite the first end. The grate further includes a ramp portion extending above the grate panel from adjacent the first end of the aperture toward the second end of the aperture. A grain sensor has a sensing location positioned at a height below the grate.

Included is a combine having a feeder housing for receiving harvested crop, a separating system for threshing the harvested crop to separate grain from residue, a crop cleaning system including a cleaning fan powered by a fan drive to propel the residue into a residue system of the combine, at least one sensor for detecting an operational parameter of the fan drive, and a controller coupled to the at least one sensor. The controller is configured to determine a load on the fan drive from the detected operational parameter, compare the determined load to a load threshold, and control a speed of the cleaning fan based on the comparison.

A harvester cleaning fan system having a cross flow fan rotor, a fan inlet, a rotor shroud, a fan outlet and a cutoff wall assembly. The fan inlet extends in the fan rotation direction around a first portion of the cylindrical rotation volume. The rotor shroud is adjacent the fan inlet and extends in the rotation direction to enclose a second portion of the cylindrical rotation volume. The fan outlet is adjacent the rotor shroud. The cutoff wall assembly extends in the rotation direction by a cutoff wall distance to enclose a third portion of the cylindrical rotation volume. The cutoff wall assembly has a first cutoff wall and a second cutoff wall. The cutoff wall distance is about 40 mm to about 90 mm, and the fan has a rotation diameter of about 400 mm to about 500 mm. An agricultural vehicle having a cleaning fan is also provided.

A cleaning system of a combine harvester includes a fan, a first valve member positioned within a first duct of the fan for throttling the flow of air through the first duct, a second valve member positioned within the second duct of the fan for throttling the flow of air through the second duct, a first actuator for adjusting a position of the first valve member, a second actuator for adjusting a position of the second valve member, first and second sensors for sensing air pressure at first and second sieves, and a controller. The controller is configured to receive the sensed air pressures from the sensors, compare the sensed air pressures with either each other or threshold values, and transmit instructions to one or both of the actuators to adjust the positions of one or both of the valve members.

A fan hub for an extractor for a harvesting machine that harvests a crop. The fan hub having a hub cover positioned along a rotation axis of a fan of the extractor. The hub cover is adjustable to alter the profile of the hub cover relative to the rotation axis.

A combine harvester includes a housing having a rear hood and defining an interior, a blower for generating an air stream in a substantially rearward direction, and a cleaning system separating residue from a crop material such that the residue is transported via the air stream rearwardly to be discharged from the housing. A chopper rotor assembly is disposed within the interior below the rear hood and includes a chopper rotor having a plurality of blades for chopping the residue as it is received via the air stream. A chopper housing is disposed within the interior and defines an inlet of the chopper rotor for receiving the residue and an outlet spaced rearward from the chopper rotor for discharge of the chopped residue from the interior of the housing. An air gap through which the air stream may exit the interior is defined between the rear hood and chopper rotor.

A debris removal system for an agricultural harvester may include an extractor having an extractor housing defining a central airflow channel for directing debris through the extractor from a central inlet to a central outlet. The extractor housing may further define an outer airflow channel surrounding the central airflow channel. The outer airflow channel may define a flow path between an outer housing inlet and an outer airflow outlet. Additionally, the extractor housing may include an internal divider wall extending between the central and outer airflow channels. Moreover, the system may include at least one flow-generating device provided in operative association with the housing. The flow-generating device(s) may be configured to generate an airflow directed through the outer airflow channel, wherein the airflow generates a negative pressure within the central airflow channel that draws the debris into the extractor housing via the central airflow inlet.