Intake efficiency in an intake system is improved. An intake system takes air through an air inlet duct extending from an air cleaner case, and includes a vortex generator that causes the flow of the intake air inside the air inlet duct to rotate around an axis of the air inlet duct.

Intake efficiency in an intake system is improved. An intake system takes air through an air inlet duct extending from an air cleaner case, and includes a vortex generator that causes the flow of the intake air inside the air inlet duct to rotate around an axis of the air inlet duct.

There is provided an air cleaner configured to be disposed inside a vehicle body frame, the air cleaner including: an air cleaner case in which an intake chamber is formed; an intake air temperature sensor configured to detect an intake air temperature in the intake chamber; an inlet tube configured to take in air to the intake chamber; and an outlet tube configured to send out air from the intake chamber. The outlet tube has an upstream portion protruding into the intake chamber, and the upstream portion of the outlet tube has a peripheral wall formed with a through hole.

There is provided an air cleaner configured to be disposed inside a vehicle body frame, the air cleaner including: an air cleaner case in which an intake chamber is formed; an intake air temperature sensor configured to detect an intake air temperature in the intake chamber; an inlet tube configured to take in air to the intake chamber; and an outlet tube configured to send out air from the intake chamber. The outlet tube has an upstream portion protruding into the intake chamber, and the upstream portion of the outlet tube has a peripheral wall formed with a through hole.

In an air cleaner for a vehicle, a connection part of a first intake duct to a cleaner case is disposed in a front half portion of one of left and right half portions of the cleaner case, the first intake duct including a first air inlet port opening forward. A connection part of a second intake duct to the cleaner case is disposed in a rear half portion of an other of the left and right half portions, the second intake duct including a second air inlet port opening rearward. The first intake duct is formed to include a first air outlet port opening rearward inside an unpurified chamber and curve in an up-down direction in a side view, and the second intake duct is formed to include a second air outlet port opening forward inside the unpurified chamber and curve in a right-left direction in a plan view.

In a saddle-ride type vehicle in which an air cleaner is arranged inward in a vehicle width direction of at least a pair of left and right main frames and arranged below a riding seat, a cleaner case for the air cleaner is configured long in a longitudinal direction of the vehicle and has a cleaner case main portion storing therein a cleaner element, and a connecting tube connection portion extending forward from the cleaner case main portion so as to be connected to a connecting tube. A pair of left and right side covers covering the cleaner case from opposite sides in the vehicle width direction are supported by side cover supporting portions that are provided on left and right opposite side walls of the cleaner case main portion and the connecting tube connection portion.

In a saddle-ride type vehicle in which a cleaner case of an air cleaner is configured with first and second case half bodies coupled to each other and arranged in a vehicle width direction, and is arranged in a space surrounded by a vehicle body frame, a first case half body is provided with: a cleaner element insertion/removal port opened outward so as to permit insertion and removal of a cleaner element therethrough; a purified air outlet connected with a connecting tube for guiding purified air to an engine body side; and an outside air suction port for introducing air from an outside into the cleaner case.

An air-cleaner structure of a saddle-ride vehicle is provided with an air-cleaner case arranged between a seat and a head pipe located in front of the seat. The air-cleaner case is provided with a bottom half and a top half. The bottom half is arranged in a space surrounded by a rear face of the head pipe and a pair of left and right main frames extending from the head pipe toward the rear of the vehicle. The top half is situated above the main frames. The top half is provided in a vertical two division structure. A dividing surface of the vertical two division structure of the top half is inclined in the vehicle-longitudinal direction. An air-cleaner element is mounted along the inclined dividing surface.

A straddle-type vehicle includes a fuel pipe provided on a rear side of an engine, a generator provided on the rear side of the engine and adjacent to the fuel pipe, an outside air introduction duct configured to guide air outside the straddle-type vehicle to the rear side of the engine, and a partition wall provided between the fuel pipe and the generator. The partition wall partitions a region on the rear side of the engine into a generator arrangement region where the generator is provided and a fuel pipe arrangement region where the fuel pipe is provided. The outside air introduction duct includes a first outlet configured to allow the air to flow out to the generator arrangement region.

A straddle-type vehicle includes a fuel pipe provided on a rear side of an engine, a generator provided on the rear side of the engine and adjacent to the fuel pipe, an outside air introduction duct configured to guide air outside the straddle-type vehicle to the rear side of the engine, and a partition wall provided between the fuel pipe and the generator. The partition wall partitions a region on the rear side of the engine into a generator arrangement region where the generator is provided and a fuel pipe arrangement region where the fuel pipe is provided. The outside air introduction duct includes a first outlet configured to allow the air to flow out to the generator arrangement region.