Patent ID: 8196605

Claim:
An air intake device for an engine, comprising a throttle body ( 1 ) having an air intake path ( 2 ), a throttle valve ( 5 ) that is supported on the throttle body ( 1 ) and that opens and closes the air intake path ( 2 ), a bypass ( 20 ) connected to the air intake path ( 2 ) while bypassing the throttle valve ( 5 ), and a bypass valve (V) for controlling the degree of opening of the bypass ( 20 ), the bypass valve (V) being formed from a tubular valve chamber ( 15 ) having an interior thereof opening on the upstream side of the bypass ( 20 ) and having an inner face with a metering hole ( 16 ) opening toward the downstream side of the bypass ( 20 ), and a valve body ( 25 ) that is slidably but non-rotatably fitted into the valve chamber ( 15 ) and that opens and closes the metering hole ( 16 ), at least part of the downstream side of the bypass ( 20 ) extending from the metering hole ( 16 ) being formed so as to cross a sliding direction of the valve body ( 25 ), characterized in that the bypass ( 20 ) is a single bypass, the tubular valve chamber ( 15 ) and the metering hole ( 16 ) and at least of the downstream side of the bypass ( 20 ) are formed in a bypass valve holder ( 10 ) provided so as to be connected to the throttle body ( 1 ), and a dividing wall ( 17 ) that divides the metering hole ( 16 ) into a plurality of small metering holes ( 16 a , 16 b ) arranged in the peripheral direction of the valve chamber ( 15 ) is formed in the bypass valve holder ( 10 ) so as to be continuous with an inner peripheral face of the valve chamber ( 15 ), and the plurality of small metering holes ( 16 a , 16 b ) communicate with a single passage ( 14 , 13 ) forming the downstream side of the bypass ( 20 ).