A centrifugal fan rotor having a frame with a rotary axis and a plurality of blades on the frame at circumferentially spaced locations around the rotary axis. The plurality of blades each has a leading edge and a trailing edge radially outside of the leading edge. The plurality of blades each has circumferentially oppositely facing first and second surfaces each extending between respective leading and trailing edges. The plurality of blades each has a material bonded at the leading edge and over only a portion of the exposed surface area of one of the first and second surfaces.

A combine harvester may include a chaffer to separate residue from grain in crop material, a fan to direct air through and across the chaffer to carry the residue from the harvester, a sensor to output signals indicating a characteristic of the crop material upstream of the chaffer and a controller to adjust a speed of the fan based on signals from the sensor.

An assembly for rotating a chain or toothed belt includes a shaft and a sprocket rotatably mounted on the shaft. The sprocket includes a plurality of teeth configured to engage the chain or toothed belt. The assembly further includes a shield assembly covering at least a portion of the sprocket. The shield assembly has an interior groove formed therein defining an enclosed interior space. Each of the teeth of the sprocket rotate through the enclosed interior space during a full rotation of the sprocket.

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 includes a roof structure located above the chopper rotor such that a minimal gap is defined therebetween. The air stream flows out of the interior via a flow path defined through the chopper rotor without being substantially redirected from flowing in the rearward direction by the plurality of blades of the chopper rotor.

An engine cooling system for an engine carried by a grain harvesting combine having an internal combustion engine and hot exhaust components, and having a front operator cab includes a generally horizontal fan assembly located atop the harvesting combine for drawing in air, a radiator associated with the engine and over which air flows for engine cooling, and charge air coolers for combustion air cooling, and air conditioning and hydraulic coolers, a centrifugal scroll that takes the drawn in air and removes entrained particles to produce a clean exhaust air and dirty exhaust air; and a filter assembly through which the pre-cleaned exhaust air flows for producing filtered air for admittance into the engine for combustion.

An airflow system that has a fan spacer within a fan assembly is provided for use with equipment such as work vehicles, which may include agricultural implements or other agricultural equipment. The fan spacer influences a width dimension of a fan housing interior and airflow characteristics of the fan assembly, such as output pressure and flow rate, to optimize fan performance for a particular implementation. In this way, the fan spacer allows for highly customizable fan performances by using housing spacers to modify fan housing dimensions and provide performance characteristics that correspond to what is needed for particular implementations while using common fan housing segments.

A self-propelled harvester such as a combine harvester including a frame having a main frame assembly and a pair of secondary frame members attached thereto. The main frame assembly supports crop processing apparatus. A feederhouse and a tangential-flow crop impelling rotor are journaled between the secondary frame members. The secondary frame members are conveniently removable from the main frame assembly for accessing the processing apparatus from a front end of the harvester.

A combine harvester including a grain pan arranged to catch a crop stream. The grain pan is driven in an oscillating manner to convey the crop stream rearwardly to a rear edge from where the crop stream falls into a grain cleaning unit. A fan generates a cleaning airstream which is directed under the rear edge. The grain pan includes a conveyance floor with a rippled floor profile. A plurality of tines are provided and secured at one end to the conveyance floor. Each tine has a saw-toothed profile to lift lighter material within the crop stream away from the heavier material and enhance stratification thereof.

A combine harvester having a grain pan arranged to catch a crop stream, the grain pan being driven in an oscillating manner to convey the crop stream rearwardly to a rear edge. A cleaning unit including a fan for generating a cleaning airstream which is directed under the rear edge. The grain pan includes a floor profile which defines a transverse profile comprising ridges and troughs. The troughs provide a plurality of longitudinal channels, wherein the ridge-to-trough height increases in the direction of conveyance. Crop material conveyed by the grain pan experiences channels that deepen towards the rear edge of the pan.

A grain cleaning system in a combine harvester including a pair of side walls, a rear wall that extends between the side walls, a sieve that oscillates in a fore-and-aft path between the side walls, a fan unit for generating a cleaning airstream, and an outlet for discharging residue from a grain-cleaning process. The outlet is framed in part by a lower edge of the rear wall. An aperture is provided in the rear wall to provide air relief to enhance the fore-to-aft flow of the cleaning airstream. Optionally, an auxiliary fan may drive air through the aperture.