DEVICE FOR CONTROLLING THE SUPPLY OF QUALITY SUPPLEMENTARY GAS INTO THE INTAKE DUCT OF AN ENDOTHERMIC ENGINE.

Description

1 relatively large gaps in the mounting position of the throttle valve and the gas supply line, in the event of relatively large thermal expansions or in the event of wear of the intake ports. In this way, for example, in full-load operation of an internal combustion engine, the return of exhaust gas can be completely avoided. State of the art: The invention starts from a device according to the type of the main claim. In such a known device, an exhaust gas return line opens perpendicularly into the intake duct of an internal combustion engine, where the outlet plane in the center of the intake pipe is approximately at the height of a throttle valve shaft. The outlet of the exhaust gas return line is associated in particular with the throttle valve, so that the part located downstream of the throttle valve shaft, when the throttle valve is fully open, completely closes the opening of the exhaust gas return line. To achieve a leak-proof seal of the exhaust gas return line, however, a snap-fit ​​connection between the throttle valve and the - 3 ì:;h B'-i is necessary. fit / Ì .A . U à<-l J / lifMHH'Jt outlet plan of the exhaust gas return pipe. Boast of the invention The regulating device according to the invention with the features of the characterizing part of the main claim has the advantage that alignment errors and different thermal expansions as well as wear are compensated for, thanks to the possibility of moving the seating surface of the closing element respectively, and a perfect and leak-proof contact of the closing element on the valve seat is achieved. In this way, especially when using the device according to the invention to control the exhaust gas return flow rate, in the full load range of the internal combustion engine, the exhaust gas return line can be closed in an absolutely leak-proof manner corresponding to a fully open throttle valve. By means of the measures indicated in the dependent claims, further developments and improvements of the invention are possible, advantageously, in accordance with the subject of the main claim. It is particularly advantageous that the valve closing element and / or the valve seat can be oriented and / or moved in opposition to the load of a spring. In this way, a desired closing force can be produced, so that perfect closure of the gas supply line is ensured, regardless of slight oscillations of the butterfly valve. In particular, the advantage is also achieved that any deposits on the valve seat or on the valve closing element have no influence on the tightness of the opening of the gas supply line, provided that these impurities consist, for example, of dust or carbon black and can be displaced by the closing force. Pisegno ·Η)Μ···Μ·ΝΜΙΐη« Six examples of embodiments of the invention are shown in the drawing and are illustrated in more detail in the following description* In particular, figure 1 shows a first example of the embodiment of the invention in the case of an exhaust gas return pipe, the part of which protrudes into the - 5 - ST?ir?!0 tO!iSty.EKÌA Γ' '.V: Ifl JMIMANN MìLANO-Flaiaa Cubilo, 2 inlet duct is inserted an intermediate element having the shape of a bellows; figure 2 shows an exemplary embodiment with a movable outlet element of an exhaust gas return duct, figure 3 shows a variant of the t— The term "displaceable B-port element" is used, according to figure 2, figure A shows a fourth embodiment with a ball-shaped valve plug, which is jointly coupled with the butterfly valve, figure 3 shows a fifth embodiment of the invention with a valve plug, which is jointly coupled with the butterfly valve, and a sixth embodiment with a valve plug, the mii.'if (\ t> .ri monti, farewell 6 - Sisyphus υν&ι Milan- ì-ì ad. articulation with the butterfly valve and is secured against relative rotation. Description doli * invention In the example of embodiment shown in Figure 1, a simplified representation of a combustion engine 1 with an intake system £? and an exhaust gas collection system 3 is shown. From the intake duct 5, through which fresh air is supplied to the combustion engine, a separate, enlarged section is drawn in which, to control the quantity of the mixture in the usual manner, there is a main throttle valve 6 rotatable around a throttle valve shaft 7. Below the main throttle valve shaft 7, an exhaust gas return line 8 opens into the intake duct 5, which branches off from the exhaust gas collection systems 3. In this example of embodiment, the return pipe (discharge pipe) is joined in a flange 10 and is inserted perpendicularly to the suction pipe S>.ira the fixed part1? protruding into the intake duct, into the exhaust return duct, and its. ” ' ~ STUDIO CONiOltKU ΒϊϊΕΫΕϊϊΙ MUMiNN Mi PAN 0-Pia,? za Caselle, 2 outlet part 12 is arranged a bellows 14» which can be made, for example, of metal membranes welded together and is welded to seals, with or without filler material# The outlet portion 12 leads to the center of the intake duct, forming there a valve channel for the half of the throttle valve located downstream of the throttle shaft 7 and is executed in this case in the form of a valve closing element and closes the opening 15 of the outlet element when the throttle valve is fully open. Such an arrangement is provided as an example to control the return of exhaust gas quantities in this internal combustion engine. At full load, when maximum power is required by the internal combustion engine, the return of exhaust gases is completely prevented, in the partial load operating range, however, when the The throttle valve is only partially open, a more or less large amount of exhaust gas return is fed into the fresh air. To achieve safe closure of the exhaust gas return line, under full load operating conditions, respectively - and - P.,!M ΓΟίί·^!! Mini imm when the throttle valve is fully open, the opening plane of the exhaust gas return line must be exactly coplanar with the plane of the fully open throttle valve. However, with the design according to the invention, the outlet part 12 is now displaceable in an axial direction of the exhaust gas return line and can also be swiveled slightly, so that the outlet part 12 can be adjusted exactly to the plane of the throttle valve in the full load position and the opening 15 is sealed. Furthermore, the elastic bellows 14 can be used to adapt the exhaust gas return line 6 in the intake duct, so that in any case the outlet part 12 is displaced by a certain amount when the throttle valve is fully opened. In this way, additional sealing forces can be achieved.which push the outlet pair 12 onto the butterfly valve half acting as a sealing element* To improve the sealing in another design 1© the butterfly valve half or the seating surface of the outlet part 12 can be coated with a sealing material with high abrasion resistance, The layout of these provisions essentially meets the requirements regarding the precision of the installation of the exhaust gas return line in the intake duct. The flexibility of the outlet section compensates for alignment errors in the angled orientation of the exhaust gas return pipe or the opening plane of the exhaust gas return pipe relative to the centerlines of the intake duct. However, if a sealing liner is provided that has sufficient inherent flexibility and flexibility, then the bellows can also be dispensed with. Figure P shows the same partial element of the intake duct b, shown in Figure 1.In this case too, the exhaust gas return pipe 6 is connected to the intake duct via a flange 10. The fixed part 11*, protruding into the intake duct, of the exhaust gas return pipe at the outer side of its end is designed to be curved and has a ring 17 there which acts as the outlet part itself, representing the valve seat for the butterfly valve. In the curved surface at the end of the fixed part 11 of the Boarico exhaust gas return pipe, a coupling groove 18 is provided, into which a snap ring 19 is inserted. The snap ring 19 penetrates halfway into a guide groove 20, the groove being milled into the inner face of the ring 17 and whose longitudinal extension in the axial direction of the exhaust gas return pipe limits the maximum travel by which the ring can be moved.A pressure spring 21 is fixed between the intake duct and the ring 17, which moves the ring on a stop formed by a limiting edge of the guide groove 20. The front surface 16 of a ring 17 serves as a valve seat for the half of the throttle valve acting as the valve closing element. When the throttle valve is now fully opened, the ring 17 is moved axially shortly before reaching the end position of the throttle valve in opposition to the load on the spring 21. This firstly produces a holding force - 11 - and secondly compensates for possible alignment errors of the ring 17 with the throttle valve. Alignment errors with respect to the vertical introduction of the exhaust gas return line 8 can be compensated for by the fact that the ring 17 at the curved end of the fixed part 11' of the exhaust gas return line 8 can be swiveled up to a certain degree. This design has the advantage that by providing a sufficiently tight fit between the ring 17 and the fixed part 11', a sufficiently tight seal is achieved. In particular, this arrangement is less expensive than the manufacture and adaptation of a metal bellows. The pressure spring used, in particular, ensures a higher resistance to the return force than the metal bellows used in the example shown in Figure 1. A variant to the design according to figure 2 or shown in detail according to figure 3* There the fixed part 11" of the exhaust gas return line at its end has an external collar 12 - stììpìp cofr!'t Λ * 1 » : The J· . * 'il ,VU. Ar.-o.ri; i a.AoAi·, V 23* in which an external annular collar 24 is provided to accommodate a heat-resistant cicatrical gasket. Under the collar is pressed the unit 17'» which on its face converging with the pressure spring 21 presents an internal collar 27» which engages like a tooth whose external collar 23* The inner collar 28 facing towards the spring 21* of the external collar 23 forms in particular for the ring 17' a physical stop on which the ring is brought by means of the force (i.e. of the precision spring 21* Even with this version, the lever 17* can be adjusted by means of the throttle valve and slightly oriented additionally, so that in this case too, errors in the perpendicular alignment of the exhaust gas return line 6 to the axis of the intake duct and errors in the installation depth arise. Compared to the version according to figure 2, this version can be achieved more simply. However, with the aid of the elastic gasket 26, a good seal can be achieved. Figure 4 shows a further improved version, in which instead of my arrangement - 13 - The valve body, which is divided into a functional part of the exhaust gas return line and a movable outlet part, only the functional part 11 is provided, the outlet of which, respectively the front surface 16*, serves as a valve seat. Furthermore, in this case a separate valve shutter 30" is provided with a head 37 in the form of a spherical portion, the spherical side of which is associated with the front surface 16". The head is carried by a conical-shaped stem 31, which is coupled with a pin 32. This passes through a hole 33 leading to a drawn part 34 in the shape of a muffler of the butterfly valve 6" and on the other side of the axial safety ring carries a safety ring 36", by means of which a defined possibility of axial displacement of the valve shutter 30 is guaranteed. The difference between the diameter of the pin 32 and the hole 33 also allows slight tilting movements of the valve shutter. Between the head 37 and the bottom of the muffler-shaped part 34 of the butterfly valve, a pressure spring 3θ is fixed, which keeps the valve shutter 30 in its output position, on the stop defined by the safety ring 36* u - SlittlO CGÌtfl;LLx£fc i-lU'ìi l! *·'«»MlLANO-Pìaiza GaetaU». ii When the butterfly valve is brought to the full load position, the head 37 with its effective surface adapts to the contact of the front surface 16' constituting the valve head. In particular, the valve shutter 30 can be adjusted and even slightly oriented. As in the previous examples of real execution, also in this case the (clear surface of the valve shutter) can be coated with sealing material. To improve the seal at the outlet of the part 1t of the gas return line, the front surface can be made conical. * execution «according to figure 3, co-i,ì(: in the example of realization according to figure 4, only the fixed part 11, protruding into the intake duct, of the exhaust gas return duct, is provided. The front surface 16* of the fixed part 11 in this case again constitutes a valve element. The valve shutter is provided with a disk 40 which is firmly joined by riveting with a pin 41. The pin 41 is connected, at the opposite end.. - 15 - :s. "' ή ,. i Q&itvllv, * with a pin 42 of small diameter, © at the collar 43, in the connection area from the large to the small diameter of the pin, is made in the shape of a ©fera. The pin 42 with small diameter diameter passes through a 33* hole on the bottom of.a spherical impressed part 45 of the butterfly valve 6 is riveted to the opposite side with a disc 46 which is adapted to the spherical impressed recess 4'. The difference between the diameter of the pin 42 and the diameter of the hole 33' allows a rocking movement of the pin 41 and therefore of the valve shutter 40. The disc 46 in particular is positioned in such a way that with this rocking movement no excessive frictional forces appear, but on the other hand no excessive axial play occurs either. This can be achieved particularly well because the disc 46 is designed in the form of a circular ring. Even with this design, with the opening movement of the throttle valve or with the closing of the exhaust gas return line opening, the valve disc 40 always adjusts itself in such a way that it comes into contact with the front surface 16 all around.The described embodiment has the advantage of ensuring a tight fit of the valve disc 40 on the valve seat in any case. In particular, it is not a problem if the exhaust gas return line 8 contacts it, for example as a result of thermal influences, or becomes oval-shaped; it is only important that the valve seat and the front surface 16 are absolutely flat. The valve disc 40 can also be produced with the necessary fit precision. In particular, the displacement device is not directly subject to contamination by exhaust gases, as occurs, for example, in the embodiment according to Figure 2. Otherwise, the displacement device is not sensitive to contamination and can be easily produced. The embodiment according to Figure 6 operates according to a similar principle.that of the embodiment according to figure 5. In this case too, the valve seat is formed by the front surface 16* of the fixed part 11 of the exhaust gas return line 8. The front surface 16* also has a valve shutter in the front with a die 48, which is joined by means of a pin 49. The pin 49 ends with a head 50 in the shape of a hemisphere, the diameter of which is larger than that of the pin 49. The head 50 in particular is fitted into a spherical seat-shaped part 51 of the butterfly valve 6 and is secured axially by means of a snap ring 53, which is arranged in an annular groove 54 in a cylindrical connecting element 55 between the spherical seat-shaped part 51 and the plane of the butterfly valve.In particular, the snap ring is located at such a distance from the head 50 that it can perform a slight rocking movement. This rocking movement now allows the disc 48 to adapt to the valve seat at the front edge 16*. This arrangement has the same advantages as those already described in Figure 5*. However, since in this case, after each lifting of the disc 48 from the valve seat, the disc can tilt and thus move into a rotary motion, one or two bent pins 57" are also provided on the disc 48, which enter a corresponding recess 58 in the throttle valve. 18 - f'YVY'' Γ>:ί· .. · , · ! j I' 'A'*i1Ή}···'.!·.. ·_i 13:· / .i»CauiiPlo, 2. In this way, the valve disc is secured against relative rotation. In the event of a deformation of the exhaust return pipe mouth, it is ensured that the valve disc always comes into contact with the same surface as the valve seat. If residues were to deposit on the disc 48 due to the quantity of exhaust gases returning, then it is thus ensured that the same surfaces, which are kept free of black gas residues by the seat seal, always come into contact with each other. The embodiment shown in Figure 6 is characterized by a particularly simple range of movement and an ability to adapt the valve disc, while maintaining the exact alignment of the corresponding sealing surfaces. Instead of manufacturing the spherical seat part 51 using the drawing process, this part can also be inserted into the prefabricated cup hole in the valve body. Any other technically equivalent safety fastening system can be used to prevent relative rotation of the disc 48. This is done in accordance with the invention and especially with the embodiment examples according to the invention.

Claims

1. Yes - the tightness of the exhaust gas return line closure is increased in the case of full-load position of the throttle valve. This significantly improves the emission values ​​and fuel consumption of the diesel engine operating with exhaust gas return, since in full-load operation the maximum required fresh air quantity and the filling level are not influenced by the return of additional quantities of exhaust gas. Furthermore, the designs according to Figures 1 and 6 have the advantage that the cross-section of the exhaust gas return line can have any desired shape, such as rectangular ovals, circles and the like.In this way the axial distance between the throttle valve bore and the outlet of the exhaust gas return line can be reduced. Therefore, with the same outlet cross-section, lower return torques, dependent on the exhaust gas pressure, are obtained on the control device. 1.Device for controlling the supply of additional fuel quantities into the intake duct of an internal combustion engine, with a throttle valve which is arranged in the intake duct and with its part, located downstream of the throttle valve shaft, can additionally control the opening of a fuel supply line flowing into the intake duct, characterised by the fact that the outlet part (12, 16, 17) of the fuel supply line (6) acts as a valve and the throttle valve (6) has a valve shutter (6, 30, 40, 48), as well as the fact that the valve shutter and / or the valve seat are orientable and / or movable in relation to the throttle valve, respectively with respect to a fixed part ( 11 ) of the gas supply pipe (6).

2. Device according to claim 1, characterised in that the valve shutter and / or the valve are orientable and / or displaceable in opposition to the load of a spring (04, 21).

3. Device according to claim 1 or 2, characterised in that the fixed part (11) penetrating the suction duct of the gas supply pipe (8) has an intermediate element inserted in it, having the shape of a bellows (14).

4. Device according to claim 2, characterised in that the outlet part of the pipe (11). of gas supply (8) is carried out in the form of a ring (17» 17*)* which is axially movable and is guided by the fixed part (11*, 11") of the gas supply pipe, where also the exit of the charge of an Oxygen ( 21 ) can be brought to a physical stop (U, 28).5, double-acting according to claim 4, characterised by the fact that the physical purification (11') of the gas supply pipe in the area of ​​the ring (17) displacement is performed in a clerical manner.

6. Device according to claim 5, characterised in that the stop is made in the form of an elaetic ring (19)* which for one part is in an annular groove (18), which is arranged in the physical part (11) of the duct, (for the other part it is in a corresponding annular groove (20) provided on the ring (17), where one of the annular grooves is made in the form of a coupling groove, while the other annular groove is made in the form of a guide groove, which defines the diameter of the ring (17) 7. A positive device according to one of the preceding claims <1 or 5» characters «wherein the ring (17*) and the physical part (11*) of the gas supply pipe engage one another like teeth, forming a stop (18).

6. A device according to one of the claims from A to 7, characterised in that in the so- η; of partial overlapping of the ring (17, 17*) and of the facial port (11*, 11") of the gas supply pipe (6) there is arranged a heat-resistant elastic sealing ring (24>).

9. PivoBitive According to one of the preceding claims, characterized in that between the butterfly valve and the mouth of the gas supply pipe there is arranged a removable valve shutter (30, 40, 48), which is coupled with the butterfly valve.

10. Device according to claim 9, characterised in that the side of the valve shutter (30) facing the opening of the gas supply pipe (8) is made of a spherical shape, and a pressure spring (38) is fitted between the valve shutter and the butterfly valve (C), 23 - SUINO CM:fl'.iì2 / . lai li! KMWH fv( ì ij iti 0 i"1 Aϊχ*££& CssioIÌOi 2 by means of which the valve shutter can be brought to a fixed stop on the butterfly valve.

11. Device according to claim 9, characterised in that the valve shutter (40, 48) is coupled with the butterfly valve by means of a pin and the pin and the butterfly valve in the contact area are made complementary to each other and reciprocally helical.

12. Device according to claim 11, characterised in that the pin (41) is lowered with respect to the butterfly valve and the collar (43) in the connection area from the large diameter of the pin to the small diameter of the pin υ is made in the shape of a sphere, and the thinner pin part 42 is secured axially and is guided with play through a hole (33') in the Ϊ valve.

13. Device according to claim 12, characterized in that the butterfly valve is drawn in the shape of a sphere around the hole (33') and in correspondence with the end, which protrudes from the hole (33*), of the thinner pin (42), for axial safety, a disk (46) is fixed, which is adapted to the spherical surface of the butterfly valve. 1 / j. Device according to claim 11, characterized in that the end of the pin (42) has a head (50) Q shaped. semi-sphere with an enlarged diameter, and the head is supported movably in a part (51), shaped like a spherical seat, of the butterfly valve, and is secured by an electro-magnetic ring (54).

15. Device according to claims 9 to 14, characterised in that the valve shutter is secured against relative rotation.

16. Device according to claim 15, characterised in that the valve shutter (40) has a pin (57) which penetrates a corresponding recess (58) of the valve to make it.

17. Device for controlling the supply of additional quantities of exhaust gas into the intake manifold of an internal combustion engine, with the throttle valve arranged in the intake manifold, with the part of which, located downstream of the throttle valve shaft, it is possible to additionally control the opening of a gas supply line leading into the intake manifold, in particular in accordance with one of the preceding claims, characterised in that the outlet plate, acting as a valve seat, of the gas supply line and, or of the part of the throttle valve acting as a valve disc, is coated with an elastomer, heat-resistant sealing material.

18. Device according to one of the preceding claims, characterised in that the gas supply pipe is an exhaust gas return pipe. # STurm ci,:::ì" patétti 1 / PUM^NN fi