Air amount adjustment valve and multiple throttle device

Abstract

A multiple throttle deviceincludes: a throttle bodyhaving a plurality of intake passages; a plurality of throttle valves; a plurality of secondary passagesrespectively bypassing the plurality of throttle valves; and an air amount adjustment valvefor adjusting an amount of air flowing through the plurality of secondary passages. The air amount adjustment valveincludes a valve plug, and a guide partfor guiding the valve plugin the axial direction. Opening into the inner peripheral surfaceof the guide partare: a plurality of first communication holesrespectively communicating with downstream sides of the throttle valvesin the plurality of intake passages; and a second communication holecommunicating with a canisterfor collecting fuel vapor. The actuatoradjusts a position of the valve plugin the axial direction such that a first effective opening area of each of the first communication holeswhich is not blocked by the valve plugand a second effective opening area of the second communication holewhich is not blocked by the valve plugchange.