An air intake device for a vehicle. The device includes an inlet for air, a first outlet arranged for providing air to an engine of the vehicle and a second outlet arranged for discharging liquid separated from the air provided to the first outlet, and an intermediate portion forming an air channel extending from the inlet to the first outlet and the second outlet. A bottom surface on the inside of the intermediate portion is inclined relative to a horizontal plane for directing liquid in the air channel towards the second outlet.

A gas-liquid separator includes an inlet pipe and an inner pipe. The inlet pipe includes a swirling flow generating member therewithin, and a first drain port through which the liquid exits. The inner pipe includes an opening at an end which is inserted into an end of the inlet pipe. The swirling flow generating member includes a vane supporting portion extending along an axis line of the inlet pipe, and stator vanes provided on an outer circumferential surface of the vane supporting portion. The vane supporting portion has a conical shape whose diameter gradually increases from a fluid entering side to a fluid exiting side of the gas-liquid two-phase fluid. The stator vanes surround the outer circumference with inclining relative to the axis line of the inlet pipe.

An intake manifold for an engine includes an air inlet port and a false wall. The air inlet port has an interior surface partially defining a channel. The false wall also partially defines the channel. The false wall is flush with the interior surface. A chamber is defined on an opposing side of the false wall relative to the channel. A gap is defined between outer edges of the false wall and the interior surface. The gap establishes fluid communication between the chamber and the channel. The air inlet port defines an orifice configured to establish fluid communication between a fuel evaporative recovery system and the chamber.

A fuel supply device has a base body, in which an intake channel section is formed. At least one adjustable throttle element for controlling the free flow cross section of the intake channel section is provided. At least one fuel opening opens into the intake channel section. A partition wall section is arranged in the intake channel section upstream of the throttle element. The partition wall section and the throttle element divide, in a completely open position of the throttle element, the intake channel section upstream of the throttle element into a mixture channel, into which the fuel opening feeds fuel, and an air channel. In order to improve the cooling of the fuel supply device, the partition wall section has at least one element for increasing the surface area within the mixture channel.

A motorcycle intake air guide for feeding an intake air volumetric flow to a motorcycle internal combustion engine includes an unfiltered-air channel, a filtered-air channel, and an air filter therebetween. An intake air guide valve provided in the unfiltered-air channel is configured to change a cross-section of the unfiltered-air channel cross-section. The unfiltered-air channel has a double-flow design at least in sections with a first unfiltered-air partial channel and a second unfiltered-air partial channel which are merged downstream of a steering head of a frame of the motorcycle in a collection region of the unfiltered-air channel. The intake air guide valve is arranged in the collection region, downstream of the first and second unfiltered-air partial channels.

An intake tower for a work vehicle has a grille with a front face and a duct defining an internal volume and an air intake. The air intake has a periphery at which the grille is mounted and first and second ends. The first end of the air intake is closer to a region of relative low pressure within the internal volume of the duct than the second end. A partition extending between the first and second ends of the air intake is recessed from the front face of the grille. The partition defines one or more intake openings leading to the internal volume of the duct. The opening(s) or portion thereof define a first flow area at the first end of the air intake and a second flow area at the second end of the air intake. The first flow area is lesser than the second flow area, and the opening(s) or portion thereof defining the first flow area is located nearer the front face of the grille than the opening(s) or portion thereof defining the second flow area.

A device for connecting to the intake manifold of an internal combustion engine, the device having at least one grooved aperture for manipulating airflow through the device as the airflow moves into the intake manifold of the engine. The grooved aperture consists of a series of concentric and parallel grooved sections, each section having a minor diameter and a major diameter and incrementally increasing diameters therebetween, such that each section forms a frustum, such that the length of the aperture has a grooved internal surface that provides structure for manipulating the airflow through the device.

A physical quantity measuring device detects a physical quantity of gas flowing in a flow passage. The physical quantity measuring device includes a sensor element that outputs a detection signal according to the physical quantity, a case that is provided to the flow passage and houses the sensor element, and a protrusion that protrudes from a passage wall surface facing the flow passage. The case includes a measurement chamber that houses the sensor element and an inflow port that is configured to cause a part of gas flowing in the flow passage to flow into the measurement chamber therethrough. The protrusion is configured to guide gas flowing along the passage wall surface toward the inflow port.

An apparatus and methods are provided for a throttle body spacer that improves the performance of an internal combustion engine. The throttle body spacer comprises a body that includes an airflow opening for conducting airflow from a throttle body into an intake manifold. A spiral is disposed along a sidewall of the airflow opening and configured for swirling the airflow. The spiral comprises a helical shape disposed around a circumference of the sidewall and extends from an initial bore near a first contact surface of the body to a second contact surface. The helical shape includes a diameter that increases as the spiral extends toward the second contact surface, giving the body a sidewall taper angle that contributes to an increase in power output of the engine. A sawtooth cross-sectional shape of the spiral causes the airflow to swirl so as to improve atomization of an air-fuel mixture entering engine.

A first fuel storage portion is disposed on the upstream side of a fuel supply device of an engine so as to be contiguous with an air-intake passage of the fuel supply device. A blow-back suppression plate for suppressing blow-back from the air-intake passage is disposed between a filter element and the first fuel storage portion of an air cleaner. A suction-back passage is formed such that fuel accumulated in a fuel accumulation portion in the air cleaner is suctioned back through the suction-back passage into the air-intake passage. The suction-back passage allows communication between the fuel accumulation portion in the air cleaner and a suction-back port formed at the downstream-side end of the first fuel storage portion.