AIR SUPPLY SYSTEM FOR INTERNAL COMBUSTION ENGINE, INTERNAL COMBUSTION ENGINE INCLUDING THE SAME, AND AUTOMOBILE INCLUDING INTERNAL COMBUSTION ENGINE

摘要

PROBLEM TO BE SOLVED: To reduce looseness sound to improve abrasion resistance, in an air supply system.SOLUTION: An air supply system is provided with: a housing 2 through which at least one new air passage passes; at least one flap 5 mounted on the housing 2 in an adjustable manner; and a flap mechanism 3 capable of being adjusted in a rotatable manner between a closed attitude of airtightly closing the new air passage and an opened attitude of opening the new air passage and circulating new air. A preload member 6 having a spring elasticity is provided in the flap mechanism 3. The preload member 6 is supported to the housing 2, and a preload resisting the opened attitude or closed attitude is applied to the flap 5.