Device for supplying a mixture of fuel and air to a manifold of an internal combustion engine

A device for the supply of a mixture of air and fuel to a manifold of an internal combustion engine, comprising an electromagnetically operated fuel atomisation and metering valve operable to deliver predetermined quantities of fuel in the form of atomised particles which move substantially within a spray cone, said valve being disposed along a duct which puts an air induction opening into communication with a mixture supply opening, the flow cross section of which is controlled by a butterfly valve, said device being fixable to an attachment plate of said manifold and being able to receive an air filter of annular form for filtering the air which enters said induction opening, characterised by the fact that it comprises an upper body in which is formed a first perforation in communication with said air induction opening and delimited by a first conical surface and a tubular valve-support element disposed within said first perforation, coaxial with said first conical surface and connected to the latter by means of a pair of ribs disposed substantially in a plane which contains the axis of said first conical surface, a lower body in which is formed a second perforation delimited by a second conical surface coaxial with said first conical surface and which is in communication with said mixture supply opening, the cone angle of said second conical surface being greater than the cone angle of said first conical surface.