Air cleaner structure

An air cleaner structure of an air cleaner for a scooter type vehicle is mounted above a power unit which has an integrated internal combustion engine and a power transmission device connected to a rear wheel, comprising:

• an air cleaner case of the air cleaner formed in a shape elongated from a side of the internal combustion engine toward a side of the rear wheel in a fore-and-aft direction when viewed from a side;
• an intake-air outlet passage, to which an upstream end of a connecting tube leading to the internal combustion engine is connected, formed forward in a front of the air cleaner case;
• a filter member of a cleaner element placed at a rear of the intake-air outlet passage in the air cleaner case;
• and
• a blowby gas return passage connected to a blowby gas return pipe of the internal combustion engine,
• wherein the blowby gas return passage and an additional air passage, which communicate with an interior of the air cleaner case, are juxtaposed with each other in a vertical direction and are formed forward around the intake-air outlet passage in the front of the air cleaner case such that the blowby gas return passage is located below the additional air passage,
• wherein the air cleaner case includes an expansion portion which bulges inwardly in a lateral direction at a forward portion of the air cleaner case,
• wherein the filter member is arranged in a rear portion of the air cleaner case.