Cylinder/crankcase group for two-stroke internal combustion engines provided with means for supercharging the engine
AssigneeEmak S.P.A.
InventorNicola CERRETO
Life of this patent
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Abstract
A fuel injection system for a two-stroke internal combustion engine (1), elastically housed internally of a chamber, comprises a carburettor (30) to which are associated an induction port (9) for an air/fuel mixture and a fuel supply conduit (10) intercepted by means for metering housed in a recess (16) communicating with a second aperture (15) located above the induction port (9), which is in turn connected by an accumulation conduit (12) to a first aperture (14) located below the induction port (9), the apertures (14, 15) being alternatively opened by the piston skirt (3); the accumulation conduit is entirely afforded in the cylinder body.
Claims8
1). A fuel injection system comprising an accumulation conduit (12) of fuel, which accumulation conduit (12) communicates with a first aperture (14) located below the induction port (9) and with a second aperture (15), located above the induction port (9), the apertures (14, 15) being characterised in that the accumulation conduit is entirely contained in the cylinder body.
2). The system of fuel injection of claim 1, characterised in that at least a tract of the accumulation conduit comprises a portion conformed as a channel, afforded in the cylinder body, which portion is closed by an external cover having a portion which is complementary to the channel.
3). The fuel injection system of claim 1, characterised in that the accumulation conduit exhibits at least two consecutive tracts lying in adjacent planes which delimit portions of the cylinder body.
4). The fuel injection system of claim 3, characterised in that one of the three planes constitutes the fixing seating of the aspiration manifold flange.
5). The fuel injection system of claim 3, characterised in that the accumulation conduit comprises a first tract which opens into a port afforded in the cylinder wall below the mixture induction port.
6). The fuel injection system of claim 3, characterised in that the accumulation conduit comprises a final tract which opens into a cavity communicating with an inside of the cylinder through a port afforded in the cylinder wall above the mixture induction port.
7). The fuel injection system of claim 6, characterised in that the cavity communicates with a fuel feed conduit through a metering valve.
8). The fuel injection system of claim 7, characterised in that the metering valve is a blade valve which opens only in a direction towards the inside of the cylinder.