FR2778944A1 - INTERNAL COMBUSTION ENGINE HAVING A COMPRESSOR - Google Patents

Abstract

This internal combustion engine, comprising at least one cylinder (2) associated with a compressor (3) for injecting pressurized carburetted air into the combustion chamber (4) of this cylinder, this compressor (3) being adapted for sucking carburetted air through a suction duct (6) provided with a first shutter (7) and for discharging carburetted air under pressure into the combustion chamber (4) through a discharge duct ( 8) provided with a second shutter (9), is characterized in that at least the discharge duct (8) is formed in a cylinder head (10) disposed on a cylinder block (11) of the engine and in that '' at least the second shutter (9) is formed by a blade valve carried by a support piece (12) engaged in a well (13) of the cylinder head (10) in the path of the discharge conduit (8) between the compressor and combustion chamber.

Description

i

  The present invention relates to an internal combustion engine comprising

  carrying at least one cylinder associated with a fuel air injection compressor

  under pressure in the combustion chamber of this cylinder.

  Motors of this type are already known in the state of the art in which the compressor is adapted to suck fuel air through

  a suction duct provided with a first shutter and for discharging car air

  pressure buried in the combustion chamber through a return pipe

  flow with a second shutter.

  Different embodiments of such motors may be found.

  See in documents CH-A-119 799, FR-A-908 916, DE-A-848 722, FR-A-2

  401 316, FR-A-2 449 198, US-A-4 359 017 and FR-A-2 727 723.

  These documents describe in particular different embodiments

  and different arrangements of the second shutter associated with the discharge duct-

is lying.

  However, the resulting motors have structures

  complex, expensive and / or relatively difficult to maintain.

  The object of the invention is therefore to solve these problems.

  To this end, the invention relates to an internal combustion engine of the type comprising at least one cylinder associated with an air injection compressor

  2 0 fuel under pressure in the combustion chamber of this cylinder, this

  presser being suitable for sucking fuel air through a suction duct

  tion provided with a first shutter and for discharging pressurized carburetted air into the combustion chamber through a discharge duct provided with a second shutter, characterized in that at least the discharge duct is formed in a cylinder head disposed on a cylinder block of the engine and in that at least the second valve is formed by a blade valve carried by a support piece engaged in a well of the cylinder head in the path of the conduit

  discharge between the compressor and the combustion chamber.

  The invention will be better understood with the aid of the description which follows.

  glass, given only by way of example and made with reference to the drawing an-

  attached which represents a sectional view of an exemplary embodiment of a motor

according to the invention.

  We recognize in this figure, an internal combustion engine

  designated by the general reference 1, of the two-stroke and scanning type.

  Other types of internal combustion engines can be envisaged.

  ges. This engine comprises at least one cylinder designated by the general reference 2, associated with a compressor 3 for injecting pressurized carburetted air.

  in the combustion chamber 4 of this cylinder.

  We also recognize in this figure, a candle associated with the mo-

  tor, this candle being designated by the general reference 5.

  The compressor 3 is in turn suitable for sucking from any suitable supply device (not shown), carburetted air through a suction duct designated by the general reference 6, provided with a first obturator rator, designated by the general reference 7, and to discharge pressurized carburetted air into the combustion chamber 4, through a discharge duct, designated by the general reference 8, provided with a second shutter designated by the

general reference 9.

  According to the invention, the discharge conduit 8 is formed in a cylinder head designated by the general reference 10, disposed on a cylinder block 11 of this engine and the second shutter designated by the general reference 9, is

  formed by a reed valve carried by a support piece designated by the reference

  general reference 12, engaged in a well designated by the general reference 13 of the cylinder head 10, in the path of the discharge conduit between the compressor 3

and the combustion chamber 4.

  As can be seen in this figure, the suction duct 6 is

  also provided for example in the cylinder head 10 of this engine.

  In the embodiment shown, the cylinder 2 and the compressor

  sor 3, are arranged side by side in the engine cylinder block and the first shutter designated by the general reference 7, can be formed by a valve made of material with a cylinder head gasket designated by the general reference 14

  in this figure, interposed between the cylinder head 10 and the cylinder block 1 1 of the engine.

  In addition, the support part 13 of the reed valve 9 is fixed in a manner

  demountable in the cylinder head well designated by the general reference 13.

  This fixing can for example be ensured by means of screw-

  sage materialized by mixed lines designated by the general reference 15 on

this figure.

  An O-ring designated by the general reference 16 can be provided between this support piece and the rest of the cylinder head to ensure a seal.

between these organs.

  Similarly, the reed valve designated by the general reference 9 which can have any suitable structure, can also be fixed from

  removable way on the support piece 12.

  In this case, the fixing of this reed valve on the part can by

  example be provided by screwing means designated by the reference ge-

  neral 17 in this figure, associated with a clamping piece 18 of the valve on the

rest of the support piece.

  The support piece has abutment surfaces, for example 19 and 20, delimiting the open and closed positions of the reed valve, the

  valve moving between these surfaces as a function of the pressures on both sides

be of it.

  Finally, it will be noted that the discharge conduit designated by the general reference 8 opens into the combustion chamber 4 of the cylinder at

  level of a combustion stratification bowl designated by the general reference

  line 21 in this figure and which is preferably provided in the cylinder head 10.

  Such a bowl having any known suitable structure

  1 0 in the prior art, it will not be described in more detail later.

  The operation of such a system is therefore as follows.

  During the descent of the piston of the compressor 3, carburetted air is sucked into it through the suction duct 6 and the first shutter 7

  which opens during this aspiration phase. The second shutter is then closed.

me.

  When the compressor 3 piston rises, the first plug

  tor 7 closes, while the second obturator constituted by the reed valve 9, opens due to the pressure in this compressor, to allow injection

  of pressurized fuel air in the combustion chamber of the cylinder.

  2 0 It is therefore conceivable that such an engine has an extremely simple structure, inexpensive and easy to maintain, insofar as in particular o the maintenance operations of the reed valve can be carried out very easily because it is fixed removably on a support piece which is it

  detachably fixed in a well of the cylinder head of the engine.

  2 5 Furthermore, this reed valve, because of its arrangement, is also

  protected from the direct effects of combustion in the chamber.

Claims (7)

  1.- Internal combustion engine of the type comprising at least one cy-   lindre (2) associated with a compressor (3) for injecting pressurized carburetted air into the combustion chamber (4) of this cylinder, this compressor being adapted to suck carburized air through a suction duct (6) fitted with a pre-   mier shutter (7) and to discharge pressurized fuel air into the chamber   combustion bre through a discharge duct (8) provided with a second shutter (9), characterized in that at least the discharge duct (8) is formed in a cylinder head (10) disposed on a cylinder block (11) of the engine and in that at least the second shutter (9) is formed by a reed valve carried by a support piece (12) engaged in a well (13) of the cylinder head (10) in the path the discharge pipe (8) between the compressor and the chamber combustion.   2.- internal combustion engine according to claim 1, characterized in that the suction duct (6) is also formed in the cylinder head (10) of the motor.   3.- internal combustion engine according to claim 2, characterized in that the cylinder (2) and the compressor (3) are arranged side by side in the cylinder block (11) of the engine and in that the first shutter ( 7) is formed by   a valve made of material with a cylinder head gasket (14) interposed between the cu-   tire (10) and the engine cylinder block (11).   4.- Internal combustion engine according to any one of the claims   previous cations, characterized in that the support part (12) of the check valve   blade (9) is detachably fixed in the well (13) of the cylinder head.   2 5 5.- Internal combustion engine according to any one of the claims   previous cations, characterized in that the reed valve (9) is fixed   demountable on the support piece (12).   6.- Internal combustion engine according to any one of the claims   previous cations, characterized in that the support piece (12) has   abutment surfaces (19,20) defining open and close positions ture of the reed valve.   7.- Internal combustion engine according to any one of the claims   previous cations, characterized in that the discharge duct (8) opens out   che in the combustion chamber (4) of the cylinder at the level of a bowl of laminate 3 5 cation (21) of combustion.   8.- internal combustion engine according to claim 7, characterized   in that the stratification bowl (21) is provided in the cylinder head (10).