A precleaner for use in an air intake system is described, the precleaner comprises a cyclone which defines a volume, the cyclone comprising an inlet and an outlet. The inlet and the outlet are arranged to generate a vortex within the volume of the cyclone when the air pressure at the outlet is lower than the air pressure at the inlet. The cyclone further comprises an aperture. The precleaner further comprises a blocking member arranged to move and concomitantly occlude the aperture only when the air pressure at the outlet is lower than the air pressure at the inlet. An air intake system comprising the precleaner is also disclosed.

A centrifugal air filter for an automotive system includes a plurality of single separators for setting an air flow passing therethrough in a turbulent motion and a separation area surrounding the plurality of single separators. The separation area receives particles from the air flow due to the centrifugal forces. A filter housing portion is located below a predefined or operation position for receiving particles from the air flow due to gravity, and an intake pipe is connected by an extraction line to a connecting pipe emerging on a filter housing and opening into the filter housing portion.

A precleaner system for an air intake system. The precleaner system includes precleaners each having flow paths that induce a rotation to air flow and separate out particulate matter. The particulate matter is ejected from an outlet port in each of the flow paths and out of a dust ejector. The precleaned air is collected into a plenum from each of the precleaners. The precleaned air can flow from the plenum to a precleaner system outlet and the precleaned air can be received by an air intake system. A cover can be used to block air flow through one of the precleaners to tune the precleaner system to the desired airflow.

A particle separator for removing particles from a gaseous stream, the particle separator having a separator body having a centerline axis and a peripheral wall defining a separation chamber, a fluid inlet in fluid communication with the separation chamber, a particle outlet in fluid communication with the separation chamber, a fluid outlet in fluid communication with the separation chamber, and a plurality of angled inlet apertures fluidly coupled between the fluid inlet and the separation chamber. A particulate separation system for removing particles from a gaseous stream, the particulate filtration system having an inlet, an outlet, and a plurality of particle separators located between and in fluid communication with, the inlet and the outlet, wherein each of the plurality of particle separators receives less than about 5 percent by volume of the flow of the gaseous stream entering the inlet.

An internal combustion engine (1) having a cylinder (5) having a rearwardly slanted axial line is provided with a plurality of cylindrical cyclone dust collection units (34) commonly connected to an upstream end of a filter dust collection unit (35). Each cyclone dust collection unit includes a main body (44, 45) internally defining a separation chamber (45C), and having an air inlet (31) communicating with outside and an air outlet (73) communicating with the filter dust collection unit, and the separation chamber is provided with a dust ejection hole (45D) directed tangentially in an obliquely forward direction. Thereby, dust ejected from the dust ejection hole is ejected away from the operator of the engine, and is prevented from depositing on the engine.

A pre-cleaner for an internal combustion engine is arranged in an intake passage of the internal combustion engine at an upstream side of a filter of an air cleaner. The pre-cleaner includes a casing that includes a cylindrical side wall and swirl generation vanes that swirl intake air about an axis of the casing. The side wall has a portion located next to an upstream side of the swirl generation vanes that is formed from an air-permeable fibrous molded body.

A harvesting combine has a forward power processing unit (PPU) powered by an internal combustion engine, a rear grain cart for storage of harvested grain, a forward operator cab, a cleaning fan assembly located about the forward bottom of the PPU, and rotor and concaves assembly for threshing grain. The harvesting combine is improved by locating a charge fan assembly behind the forward operator cab and drawing air from about the top of the PPU and directing a portion of an air flow from the charge fan assembly downwardly into the cleaning fan assembly.

The invention relates to a water separating arrangement in a vehicle air intake intended for mounting between a source of ambient air and an air filter unit. The water separating arrangement (101; 201; 301) comprises a first water separator (110; 210; 310) having a horizontal air intake section (212; 312) and a first water separating section (211; 311), which first water separating section is arranged at least partially surrounding an outer portion of the air intake section (212; 312). The water separating arrangement (101; 201; 301) further comprises a second water separator (120; 220; 320) comprising a housing (221; 321) with an air inlet (223; 323) connected to the air intake section (212; 312); an air outlet (224; 324) connected to an air outlet section (229; 329); wherein the second water separator is arranged to redirect the flow of ambient air over an angle of at least 80.

An air filter for heavy dust conditions has an efficient scavenging system. The air filter includes: a housing, a permeable filter, and a scavenger system. The scavenger system disposes of particles collected on the upstream surface of the permeable filter. The scavenger system includes: an air suction source, and a shutter. The shutter is positioned substantially along, typically below, the permeable filter, at a certain distance from a wall, typically the bottom wall, of the housing. The air suction source draws air from a collecting space located between the shutter and the wall of the housing. The shutter is being selectively operated to permit or restrict passage there-through. The air suction source efficiently operates to scavenge particles from the collecting space when the passage through the shutter is at least partially restricted.

An engine air filter for heavy dust conditions such as used in heavy military and off-road vehicles, including a scavenging system, and a method of operation thereof. The air filter includes: a housing, a precleaner, a permeable filter, and a scavenger system. The scavenger system disposes of particles collected at the precleaner and on the upstream surface of the permeable filter. The scavenger system includes: an air suction source and a three way valve. The three way valve is airflow coupled to the precleaner, to the permeable filter and to the air suction source. The three way valve enables scavenging of the precleaner and the permeable filter alternately. Optionally, the air filter may further includes a pulse jet back-flow flush system.