MXPA97005226A - Aspiration device for an inte combustion engine - Google Patents

Abstract

The present invention relates to an air suction device for an internal combustion engine, wherein the air suction device has an opening at least partially variable, to adapt the air inlet to the operating conditions of the engine; air suction device comprises an inner tube and an outer tube that surrounds the inner tube, said inner tube has an outer surface that is spaced on all sides with respect to the outer tube, and means to isolate air flow between the inner and outer tubes , from which, in a state of operation of the motor with a low suction volume, an air current is drawn into the suction device only through the inner tube, and, when the suction volume is increased, in addition From the air stream through the inner tube, another air stream is drawn through an additional suction opening, of varying size. able, between the inner tube and the outer tube

Description

Suction arrangement for an internal combustion engine The present invention relates to improvements in a suction arrangement for internal combustion engine, which comprises a passage opening at least partially variable to adjust the suction behavior to the driving regimes of the internal combustion engine.

STATE OF THE ART A suction arrangement for an internal combustion engine is already known from the German patent application published DE-OS 40 41 786, in which a controllable closing member has been provided for varying the opening area of the passage through which the aspirated air circulates. The closure member is located in a transverse channel that is between two suction channels, said closure member being open or closed by means of control instructions provided by an electronic control arrangement. The operating instructions depend on the number of revolutions of the internal combustion engine and the outside air temperature, which is determined by means of a temperature sensor. The present invention has the purpose of further developing a suction arrangement for an internal combustion engine according to the exordium of the main claim, which allows with simple means and without additional control devices to adjust the passage opening of the suction arrangement to the running regimes of the internal combustion engine.

Advantages of the present invention The inventive suction arrangement satisfies the purpose stated by the fact that the suction arrangement has at least one inner tube whose outer jacket is spaced on all sides with respect to an outer tube, the sucked air stream flowing to a running speed with reduced suction volume only through the inner tube and in case of increasing the extra suction volume to said air stream flowing through the inner tube, another air stream through an additional through opening variable in its magnitude arranged in the area between the respective inner tube and outer tube. Particularly advantageous is the suction arrangement according to the following invention in that the emission of noise from the combustion engine is reduced in particular by a simple adjustment to the number of revolutions of the size of the passage opening area for the volume of air sucked. For each number of revolutions of the internal combustion engine, a certain size of the area of the passage opening is optimal, with a small diameter leading to the lowest possible noise emission at a low number of revolutions.

According to the present invention, at a low number of revolutions or in the case of a reduced suction volume, only the inner tube is open, and only when the number of revolutions increases or the volume sucked up is increased is an additional opening of an enlarged passageway added. variable shape, arranged between the inner tube and the outer tube. If several inner tubes are used, it is also possible to additionally provide variable through openings between said other inner tubes. Said construction configuration of the variable passage openings, as will be described below, are applicable in this case in the same way. The variable passage openings can be realized in a simple manner by a passive mechanism in the form of a flap, which is formed in the space between the tubes, defined by separators in the form of a strip. In order to open the flap mechanism, it is sufficient in this case to increase the suction pressure, for example by increasing the number of revolutions of the internal combustion engine. In a particularly advantageous manner, the clapper mechanism has been made in the manner of an elastic sealing lip, which is retained in each case on the one hand and which is displaceable by its movable portion so that it moves away from the outer surface of the other tube, totally or partially releasing the additional passage opening. Said elastic sealing lip advantageously consists of a temperature stable elastic material, for example elastomer, TPE or the like, whereby the opening behavior is substantially independent of the temperature. In this case, the free moving portions of the sealing lip are as long as possible as long as possible in order to promote the independence of the temperature. To improve the opening behavior, the elastic sealing lip is further split at its free peripheral end so that the free parts are even more flexible. An eventual compression of the free portions necessary to press said sealing lip on the in each case another tube can be provided in a simple manner by means of an annular spring. Other geometrical configurations still possible of the elastic sealing lip and its best arrangement in each case (either in the entrance opening, in the exit opening or between these) results in each case from its special application, for the type of construction and / or operating conditions of the internal combustion engine. Furthermore, it is advantageous when at least one inner tube is at least somewhat longer than the respective outer tube and consequently protrudes to a lesser extent from the plane defined by the inlet opening. In this way it is possible to largely avoid turbulence and additional depression in the additional passage opening, which could adversely affect the suction behavior.

Drawings The embodiments of the suction arrangement according to the present invention will be described below in connection with the drawings, in which: Figure 1 illustrates a sectional view of a first embodiment of the suction arrangement with an inner tube and an outer tube, as well as an elastic sealing lip. Figure 2 illustrates a section through the suction arrangement according to Figure 1. Figures 3 to 8 illustrate different embodiments of the elastic sealing lip. Figures 9 to 11 illustrate different arrangement variants of the elastic sealing lip. Figure 12 illustrates an embodiment of the suction arrangement with different lengths of the inner tube through the outlet opening.

DESCRIPTION OF THE EXEMPLARY EMBODIMENTS In figure 1 there is illustrated an aspiration arrangement 1 for an internal combustion engine (not shown), through which an air current is sucked according to the arrow 2. The suction arrangement 1 has a tube interior 3, an outer tube 4 and diantancers in the form of a strip 5 arranged between the tubes 3 and 4. The inner tube 3 is elongated in this case by a predetermined distance with respect to the plane defining the entrance opening 6. Although in this and the subsequent representations there is only one inner tube 3, in principle it is possible to provide a plurality of inner tubes 3, which in each case define with the corresponding outer tube additional variable pitch openings. In the outlet opening 6, an elastic sealing lip 7 is disposed in the outer tube 4, which has a freely movable portion 8 within certain limits. The sealing lip 7 is guided with the free portion 8 inclined in the rearward suction direction, so that with a certain increase of the suction depression the free portion 8 of the sealing lip 7 moves away from the inner tube 3 and defining an additional passage opening for the air stream. FIG. 2 shows a cross section through the suction arrangement according to FIG. 1, which exemplifies in particular the arrangement of the spacer-shaped spacers 5 arranged between the tubes 3 and 4. FIG. 3 illustrates in detail a first exemplary embodiment of the sealing lip 7 with the freely flexible portion 8, a plan view on the sealing lip 7 having been shown in the right half of FIG. 3. In order to increase the flexibility of the free portion 8 of the sealing lip 7, they have provided according to figure 4 slits 9 that favor a translation of the movement of the free flaps of the sealing lip. The number and size of the slits 9 is selected as a function of the pressure conditions in the suction arrangement or of the driving modes of the internal combustion engine or the elasticity of the sealing lip 7. In FIG. 5 it has been applied in place of slots 9, folds 10 which, in a manner comparable to the slits 9 according to Figure 4, favor the opening of the sealing lip 7. The exemplary embodiment according to Figure 6 presents, in addition to the slits 9, also an annular spring 11, which provides a certain compression of the sealing lip on the inner tube 3. For certain applications, it is required that the sealing lip 7 has an opening behavior governed to a certain extent in a passive manner, so that only from a determined predetermined depression by force spring of the annular spring 11 activates the additional passage opening. 7 and 8 illustrate in each case another example of embodiment of the sealing lip 7, with a vaulted enlargement of the free portion 8, having a certain rigidity in the zone 12. The variation of the passage opening area also takes place in this case by means of the arrangement of slits 9 (Figure 7) or by means of folds 10 (Figure 8).

Figure 9 illustrates an embodiment of a suction arrangement 1 with a sealing lip 13, which is fixed on the inner tube 3 and seats with its flexible portion on the outer tube 4. Other possibilities of arrangement of the sealing lip 13 Figure 10 (fixing in the area of the outlet opening 14 in the outer tube 4) as well as in Figure 11 (fixing in the area of the outlet opening 14 in the inner tube 3). The constructive embodiments of the sealing lip 13 are adapted to the different application cases, making use of the characteristics described in connection with FIGS. 3 to 8 in terms of flexibility. Another possible configuration of the inner tube 3 is illustrated in FIG. 12, in which the inner tube 3 protrudes with respect to the plane defined by the outlet opening 14, thus ensuring the most favorable aerodynamic shape of the air stream at the outlet . A shortened shape of the inner tube 3, in which the inner tube ends at the outlet opening 14, has also been indicated by a dashed line 15. The most favorable configuration in each case, in particular in terms of noise emission, in this case, it depends in particular on the type of internal combustion engine that consumes the suction air.

Claims (10)

1. CLAIMS 1.- Improvements in a suction arrangement for internal combustion engine, which comprises a passage opening at least partially variable to adjust the suction behavior to the running regimes of the internal combustion engine, characterized in that the The suction arrangement has at least one inner tube, the outer jacket of which is spaced on all sides with respect to an outer tube, the air stream drawn to a running speed with reduced suction volume flowing only through the inner tube and in case of increase the volume of extra suction to said stream of air flowing through the inner tube, another stream of air through an additional passage opening variable in its magnitude arranged in the area between the respective inner tube and outer tube.
2. 2.- Improvements in an aspiration arrangement according to claim 1, characterized in that the area between the inner tube and the outer tube is defined by means of strip-shaped spacers, a passive mechanism in the shape of a strip being found in said zone. hinge, which when increasing the suction depression causes a variable opening of said area for the intake air stream.
3. 3. Improvements in an aspiration arrangement according to claim 2, characterized in that the mechanism in the form of a hinge is constituted by an elastic sealing lip that is clamped on the entrance opening in the outer tube and said elastic sealing lip being guided obliquely in the suction direction on the outer jacket of the inner tube, the sealing lip or portions thereof being displaceable in the suction direction so as to move away from the inner tube, overcoming a certain pretension.
4. 4. Improvements in an aspiration arrangement according to claim 2, characterized in that the mechanism in the form of a hinge is constituted by an elastic sealing lip, which is fastened in the entrance opening or in the exit opening of the suction arrangement either in the outer tube, or in the inner tube, and said elastic sealing lip seats with its movable flexible portions on the in each case another tube, the movable portions or segments thereof being movable in the direction of aspiration , moving away from the in each case another tube exceeding a certain pretension.
5. 5. Improvements in an aspiration arrangement according to claim 3, characterized in that the elastic sealing lip has at least four slits that run radially from the inner tube towards the outer tube, said slits having a predetermined length.
6. 6. Improvements in an aspiration arrangement according to one of claims 3 or 5, characterized in that the elastic sealing lip is compressed on the inner tube by means of an annular spring.
7. 7. Improvements in an aspiration arrangement according to one of claims 3, 5 or 6, characterized in that the elastic sealing lip is enlarged in a domed manner in the suction direction and has areas with increased stiffness.
8. 8. Improvements in an aspiration arrangement according to one of the preceding claims, characterized in that the inner tube is extended on the side of the entrance opening so that it projects with respect to the piano defined by the entrance opening.
9. 9. Improvements in an aspiration arrangement according to at least one of the preceding claims, characterized in that the inner tube is extended on the side of the outlet opening so that it protrudes with respect to the outlet opening.
10. 10. Improvements in an aspiration arrangement according to at least one of claims 1 to 8, characterized in that the inner tube is shortened on the side of the outlet opening so that it terminates inside the outer tube. R E S U M N N The present invention relates to improvements in a suction arrangement for internal combustion engine. The suction arrangement in question is provided with at least :? a partially variable through opening in which the intake behavior is adjusted to the engine operating conditions. In order to achieve an optimum reduction of the emission of noises in function of the regimes of march of the engine, the provision of admission presents / displays at least a tube 10 inside and one outside tube. The intake air stream is aspirated respectively from the prevailing service conditions through the inner tube and an additional air stream is drawn through an additional through opening whose size can be varied, between the inner tube and the tube. L5 exterior. The additional passage opening is provided with an elastic sealing lip. twenty 25