There is provided an air cleaner configured to be disposed behind an engine and inside a vehicle body frame. The air cleaner includes: an air cleaner case in which an intake chamber is formed; an air filter that divides the intake chamber into a dirty side and a clean side; an inlet tube configured to take in air from a vehicle rear side to the dirty side; and an outlet tube configured to send air from the clean side to the engine. The inlet tube and the outlet tube are attached to an upper side of the air cleaner case, and an expansion portion is formed on a lower side of the air cleaner case, the expansion portion being formed by expanding the clean side further downward than the dirty side.

There is provided a straddle-type vehicle, including: a pair of seat frames; a seat; an air cleaner; a battery; and a bracket. A rear portion of the air cleaner and the battery are positioned below the seat. The battery is disposed above the rear portion of the air cleaner. The bracket extends in a left-right direction of the straddle-type vehicle and passes between the rear portion of the air cleaner and the battery. A left end side and a right end side of the bracket are connected to the pair of seat frames respectively. The rear portion of the air cleaner is suspended by the bracket. The battery is installed on the bracket.

The air cleaner (32) comprises a base member (41) including a base wall (41A) extending substantially horizontally, and a cover member (42) attached to an upper side of the base wall to jointly define a filter chamber (70) for receiving a filter element (43) therein. The air cleaner further includes a passage member (44) communicating with the filter chamber and incorporated with a plurality of air ejection pipes (44C) each surrounded by an annular air inlet passage (44E) fitted with guide vanes (44D) for rotating the air flow, and a case member (45) defining separation chambers (45C) for separating dust from the rotating air flow. The passage member (44) is interposed between the cover member (42) and the case member (45).

An apparatus and a method are provided for a multiple inlet air box to communicate an airstream through an air filter to an air intake duct of an internal combustion engine of a vehicle. The multiple inlet air box is comprised of a housing that supports the air filter within an interior of the housing. A mount portion within the housing fixedly receives a base of the air filter. Multiple air inlets couple with corresponding air inlet ports of the vehicle to direct the airstream into the multiple inlet air box. A duct directs the airstream from the multiple air inlets to the interior of the housing. A conduit communicates the airstream from an interior of the air filter to the air intake duct of the internal combustion engine.

A siloxane mitigation system for a machine system having an internal combustion engine includes a siloxane trap having a plurality of adsorbent cartridges fluidly in parallel with one another, an air precleaner fluidly connected to a trap housing inlet, and a blower structured to blow intake air to the siloxane trap to compensate for a pressure drop across the siloxane trap. A trap performance sensor of the siloxane mitigation system is structured for monitoring an exhaust pressure to indicate performance degradation of the siloxane mitigation system and activate an operator-perceptible alert.

There is provided an air cleaner including: an outlet pipe through which air is discharged; an airflow meter that is inserted toward an interior of the outlet pipe through a wall of the outlet pipe; and a flow-regulating member that is formed projecting from an inner surface of the outlet pipe at a side of the airflow meter, the flow-regulating member including an edge that is formed with a peaked shape with respect to the inner surface and that runs along a direction of flow of air, a rear end that is formed at a downstream end of the edge in the direction of flow, and that is shaped cut sharply toward the inner surface and a width-narrowing portion that decreases in width in a circumferential direction of the outlet pipe on progression downstream in the direction of flow.

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 saddle riding vehicle includes a body frame, an exhaust pipe, a muffler, and a catalyst. The body frame includes a main frame, a seat frame that extends rearward from the main frame and supports a seat for occupant, and a rear frame that extends from the main frame upward to a rear and is connected to the seat frame. The exhaust pipe extends rearward of the vehicle from an exhaust port of an engine. The muffler is connected to a rear end portion of the exhaust pipe. The catalyst is disposed in the muffler. An air cleaner box is disposed rearward of the engine. The catalyst disposed in the muffler is disposed in a space surrounded by the main frame, the seat frame, and the rear frame and overlaps with the air cleaner box as viewed in a side view of the vehicle.

An apparatus and a method are provided for an aircharger air intake system for filtering and conducting an airstream to an air intake of an engine. The aircharger air intake system includes an air filter comprising a filter medium configured to entrap particulates flowing within the airstream. An air box comprising one or more sidewalls and a mount wall is configured to support the air filter within an engine bay. The air box is configured to be mounted, or fastened, onto the engine. An intake tube is coupled with the air filter and configured to conduct the airstream to the air intake of the engine. The intake tube is configured to be coupled with an air temperature sensor or a mass air sensor of the engine. An adapter is configured to couple the intake tube with the air intake.

An air cleaner backing plate for coupling to an engine disclosed herein includes a first side to be coupled to an engine and a second side opposite the first side. The backing plate further includes an intake aperture to be aligned with an air intake port of the engine and a tube coupled to the backing plate. The backing plate may further include a reservoir and/or a circular attachment coupled thereto.