Pipe with a variable cross section

Details Pipe with a variable cross section Pipe with a variable cross section

F - Mech Eng,Light,Heat,Weapons

02

M

F02M 35/10 (2006.01) F02B 27/02 (2006.01) F02M 35/12 (2006.01)

Patent

CA 2280917

The invention relates to a suction pipe (10) with a variable cross section, in particular for insertion into the intake section of an internal combustion engine. To this end, a variable element (20) is provided to narrow the pipe cross section over a long segment when actuated. The invention seeks to keep the flow channel as narrow as possible, according to the operating state of the motor, thus reducing the bass portion in the intake noise. The variable element is preferably activated by low pressure which is obtained in the further course of the suction channel.

L'invention concerne une tubulure d'admission (10) à section variable, destinée notamment à être montée dans un secteur d'aspiration d'un moteur à combustion interne. A cet effet, il est prévu un vario-élément (20) réduisant la section de la tubulure, sur un long parcours, lors du fonctionnement. L'invention vise à maintenir le canal d'écoulement aussi étroit que possible, en conformité avec le régime de fonctionnement du moteur et de réduire ainsi les proportions des graves dans le bruit d'aspiration. Le vario-élément est de préférence activé par une dépression qui est obtenue dans le cours ultérieur du canal d'aspiration.

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