Air-intake duct and air-intake structure

An air-intake structure provided between a plurality of air outlets of an air cleaner box constituting an air cleaner and a plurality of air inlets of a throttle body constituting a throttle device and including an air-intake duct structure configured to guide air cleaned by the air cleaner to the throttle device, the air-intake duct structure comprising:

• a plurality of tubular coupling members including upstream coupling portions coupled in an air tight manner to the air outlets, respectively, and downstream coupling portions coupled in an air tight manner to the air inlets, respectively, the tubular coupling members being entirely formed of an elastic rubber material;
• a plurality of air guide members including first air inlets configured to take in the air therethrough from inside of the air cleaner box, first air outlets configured to discharge the air therethrough toward the throttle body, and fitting portions fitted to the coupling members, respectively;
• a coupling portion for coupling a plurality of air guide members to each other to constitute an air guide unit;
• and
• at least one fastening member configured to fasten the air guide unit to the air cleaner box;
• wherein a plurality of injectors having injection ports for injecting a fuel are provided inside of the air cleaner box to correspond to the plurality of air guide members, respectively;
• and
• the first air inlets are disposed to face the injection ports, respectively.