초록 ▼

An apparatus for preventing flow noise which suppresses the noise caused at the time of opening of a throttle valve provided in an intake passage of an internal combustion engine etc. At the downstream side of a pair of clearances formed at the top and bottom when the throttle valve opens, a means i

An apparatus for preventing flow noise which suppresses the noise caused at the time of opening of a throttle valve provided in an intake passage of an internal combustion engine etc. At the downstream side of a pair of clearances formed at the top and bottom when the throttle valve opens, a means is provided acting on the flows of air passing through at least one of the clearances to reduce the flow rate and acting on the flows to cause the point of convergence of the flows of air passing through the pair of clearances to shift to the downstream side.

대표청구항 ▼

[ What is claimed is:] [1.] An apparatus for preventing flow noise in a throttle valve in an air volume regulating mechanism comprising an air passage provided in an internal combustion engine and a throttle valve pivotally supported by a shaft inside said air passage and causing said throttle valve

[ What is claimed is:] [1.] An apparatus for preventing flow noise in a throttle valve in an air volume regulating mechanism comprising an air passage provided in an internal combustion engine and a throttle valve pivotally supported by a shaft inside said air passage and causing said throttle valve to pivot around said shaft to change the sectional area of said air passage and thereby regulate the volume of air flowing through said air passage,wherein said throttle valve has one peripheral portion which pivots about said shaft to the downstream side in the direction of flow of air in said air passage when the valve opens and another peripheral portion which pivots to the upstream side of said air passage,and wherein a pair of resistance means for acting on the flows of air passing through the clearances is provided at a downstream side of a pair of clearances formed at portions around said throttle valve most distant from said shaft in the initial period when said throttle valve opens,and wherein the one of said pair of resistance means arranged at said one peripheral portion of said throttle valve is arranged shifted in position to the downstream side of the air passage from the other of said pair of resistance means arranged at said other peripheral portion of said throttle valve.