EP1980741A2 - Intake snorkel of an air intake apparatus for the intake of combustion air for a combustion engine - Google Patents

Abstract

The suction snorkel (1) of an air suction tract comprises an opening (8) and a closure element (5) assigned to the opening. The closure element is moved between a closing position, which locks the opening and an opening position, which releases the opening. A selected force is provided, where the closure element is so arranged that it is streamed with an excess pressure from an air flow entering into the suction snorkel.

Description

The present invention is in the field of automotive engineering and relates to a Ansaugschnorchel an air intake tract for sucking combustion air for an internal combustion engine of a motor vehicle. Furthermore, the invention relates to an air intake tract equipped with such an intake snorkel and to a motor vehicle equipped with such an air intake tract.

State of the art

Motor vehicles are usually equipped with an air intake tract for supplying the internal combustion engine with the combustion air necessary for the combustion.

In modern motor vehicles, the air intake tract is generally designed in such a way that combustion air (raw air) is sucked in via a terminal air intake region provided with an orifice, generally referred to as an intake snorkel, and supplied with the interposition of further components of the internal combustion engine which reduce wear or increase the power , Thus, in the air intake tract usually a suction snorkel in the flow direction downstream air filter is provided by which should avoid that non-gaseous particles, such as dust particles and water droplets, get into the combustion chamber, which deteriorates the efficiency of the internal combustion engine and increases their wear. In addition, in the Luftansaugtrakt to increase the efficiency of the combustion of the air filter downstream in the flow direction turbocharger be provided with intercooler.

As is known, the air filter settles through the filtered dust particles with time and must then be replaced, which usually takes place within specified service intervals. Nevertheless, it is not uncommon in practice that air filters, for example, by frequent use of the motor vehicle on dusty roads and roads already fulfill their function poorly before their actual replacement date, so that the wear of the internal combustion engine is increased by the introduced foreign particles. In addition, it may happen that the vehicle user overlooks the appointment for an exchange of the air filter or willingly does not meet such exchange. It is also conceivable that the replacement of the air filter due to a poor supply of spare parts, for example, in remote areas, not or only partially possible.

task

In contrast, the object of the present invention is to provide a Ansaugschnorchel an air intake tract for sucking combustion air for an internal combustion engine for driving the motor vehicle available, by which the engine of dust particles and water droplets purified combustion air can be made available even if an air filter is missing or has lost its functionality.

This object is achieved according to the proposal of the invention by a Ansaugschnorchel an air intake tract for sucking combustion air for an internal combustion engine of a motor vehicle with the features of the independent claim. Advantageous embodiments of the invention are indicated by the features of the subclaims.

According to the invention a Ansaugschnorchel an air intake tract for sucking combustion air for an internal combustion engine for driving the motor vehicle is shown.

The intake snorkel is a terminal air intake area of the air intake tract which serves to supply the internal combustion engine with combustion air. The intake snorkel is provided for this purpose with a mouth for sucking the combustion air, which is preferably arranged in the motor vehicle so that it can absorb the wind of the motor vehicle in motion. Due to the overpressure of the wind, a first air flow is generated in the intake snorkel. In order to record the airstream of the moving motor vehicle, it is advantageous if the mouth of the intake snorkel is angeodnet in the front end of the motor vehicle. Advantageously, the mouth of the intake snorkel is directed frontward.

As such, the intake snorkel may extend, for example, from the mouth for sucking the combustion air to a conventional air filter for filtering the intake combustion air. As such, the air intake tract, by which the internal combustion engine is supplied with intake combustion air, extends between the opening for drawing in the combustion air and the internal combustion engine fed with combustion air.

The intake snorkel is advantageously provided with a section designated as a "flow direction change section", which is configured such that the first flow direction of the first air flow entering the intake snorkel is changed in a second flow direction, different from the first flow direction, of a second air flow drawn to the internal combustion engine. In the flow direction changing section, the second air stream reaching the engine becomes one of sucked in the first flow direction different second flow direction. For example, the first flow direction and the second flow direction approximately at an angle of 90 ° to each other.

According to the invention, the intake snorkel is provided, in particular in the region of the flow direction change section, with an opening (opening of its wall) and a closure element associated with the opening for closing and releasing the opening. Through the opening, the lumen of the intake snorkel is fluidly connected to the environment of the intake snorkel, typically the engine compartment.

The closure element is movable by means of a movement mechanism between a closed position closing the opening and an opening position which releases the opening. In addition, the closure element is held by a locking mechanism with a selectable force in the closing position.

To realize a movement mechanism for moving the closure element between the opening and closing position, the closure element can be pivoted as part of the intake snorkel on the remaining Ansaugschnorchel and abut the opening from the outside. In particular, the closure element can be articulated in the region of the mouth on the remaining intake snorkel.

To realize a closing mechanism to hold the closure element in the closed position with a selectable force, for example, a spring element can be provided, by which the closure element is held in the closed position with a selectable spring force. It is also conceivable that the closure element is held in the closed position by the selectable magnetic force of a magnetic element.

In a particularly advantageous embodiment of the intake snorkel invention, the closure element is held only by the force acting on it gravity in the closed position. In this case, the closure element is advantageously attached to the intake snorkel, in particular articulated, so that it can be swiveled out of its closed position into its open position by exerting a correspondingly large force against its own weight force, so that it otherwise automatically returns to its closed position.

An essential feature of the intake snorkel is that the closure element is arranged so that it can be flowed by the first air flow in the first flow direction, that is, with an air flow, in particular not yet deflected by the flow direction change section in its flow direction, with overpressure. The closure element can thus be brought by the dynamic pressure of the first air flow in the first flow direction in its open position, if the dynamic pressure exerted by the influx of the first air flow dynamic pressure and thereby exerted on the closure element dynamic pressure force is so great that the force of the closing mechanism, with which the closure element is held in its closed position, is overcome. The inner surface of the closure element facing the lumen of the intake snorkel serves as a storage surface when the first air stream flows against it. An influx of the closure element by the first air flow takes place when the first air flow flows against the closure element with overpressure. Such overpressure arises in particular when the mouth is arranged so that it can absorb the wind of the moving motor vehicle. Thus, in other words, it is required that the shutter member is arranged to be pressurized (particularly generated by wind) can be flown by the first air flow with the first flow direction.

Merely for the sake of completeness it should be mentioned that "dynamic pressure" is understood to mean a dynamic pressure force caused by an inflowing air flow.

Thus, the Veschlusselement is overflowed with overpressure, it is advantageous if the closure element is disposed near the mouth of the intake snorkel for sucking the combustion air, so that the largest possible back pressure of the particular generated by wind first air flow can act on the closure element. For this purpose, the flow direction changing section particularly advantageously adjoins directly to the mouth of the intake snorkel for drawing in the combustion air. Furthermore, it is particularly advantageous in this respect if the closure element, with respect to the first flow direction of the first air flow, is arranged on a side opposite the mouth of the suction snorkel.

In the intake snorkel is required to overcome the force of the closing mechanism, with which the closure element is held in its closed position, an overpressure, in particular by wind of the moving motor vehicle, against the closure element flowing first air flow in the intake snorkel. The force exerted by the closing mechanism on the closure element force, by which the closure element is held in the closed position, is selected so that the closure element is brought into its open position upon reaching a desired back pressure of the inflowing first air flow.

When a first air flow is generated with the first flow direction in the intake snorkel while driving through wind, brought by its force exerted on the closure element back pressure the closure element in its open position Thus, the dust particles and water droplets transported in the air flow in the first flow direction are carried into the environment (eg, engine compartment) of the intake snorkel due to their inertia by the opening released from the shutter member. At the same time, in the flow direction changing section, a second air flow purified in this way in the second flow direction is sucked to the internal combustion engine due to the suction effect of the internal combustion engine.

Thus, the service life of a downstream air filter can be substantially increased by the intake snorkel according to the invention, since this already (pre-) purified combustion air is supplied to the second air stream. Alternatively, in the case of a missing or strongly deteriorated air filter of the internal combustion engine with the second air flow, combustion air purified at least partially by particles can be supplied.

In a particularly advantageous embodiment of the intake snorkel, the closure element is provided on its inside flowed by the first air flow inside with a curved surface which is formed so that in the open position of the closure element, the flow direction of the incoming air flow is deflected in the direction of the second flow direction of the second air flow, whereby the supply of the internal combustion engine with purified air can be improved.

The invention further extends to an air intake tract for feeding an internal combustion engine with combustion air with a suction snorkel as described above.

In addition, the invention extends to a motor vehicle with a suction snorkel as described above an air intake for sucking Combustion air for an internal combustion engine for driving the motor vehicle. Advantageously, the mouth of the intake snorkel is arranged in the motor vehicle so that it can absorb the wind of the moving motor vehicle.

embodiment

Fig. 1

eine perspektivische Ansicht eines Ausführungsbeispiels für einen erfindungsgemäßen Ansaugschnorchel mit offenem Verschlusselement;

Fig. 2

eine perspektivische Darstellung eines vertikalen Schnitts durch den Ansaugschnorchel von Fig. 1 gemäß der Schnittlinie I-I mit geschlossenem Verschlussselement;

Fig. 3

eine perspektivische Darstellung des Schnitts durch den Ansaugschnorchel von Fig. 2 mit offenem Verschlussselement.

The invention will now be explained in more detail with reference to an embodiment, reference being made to the accompanying drawings. Show it:

Fig. 1

a perspective view of an embodiment of a suction snorkel invention with open closure element;

Fig. 2

a perspective view of a vertical section through the intake snorkel of Fig. 1 according to the section line II with closed closure element;

Fig. 3

a perspective view of the section through the intake snorkel of Fig. 2 with open closure element.

It will now be related to the FIGS. 1 to 3 wherein an embodiment of an intake snorkel according to the invention of an air intake tract for drawing combustion air for an internal combustion engine for a motor vehicle is shown.

Accordingly formed in the form of a pipe end suction snorkel 1 comprises a cuboid in its outer shape straight snorkel section 2, which merges via a curved snorkel section 3 in a mouth 4 for sucking the combustion air (raw air). The cuboid snorkel section 2 is via a further, not shown here Luftansaugtrakt with the Internal combustion engine connected to supply this the sucked combustion air.

Due to the curved snorkel section 3, combustion air entering through the mouth 4 into the intake snorkel 1 is conducted into the cuboid snorkel section 3, wherein the flow direction of the air flow is deflected by the curved snorkel section 3 by approximately 90 °.

The curved snorkel section 3 is composed of a curvature outside wall section and two lateral wall sections 8, the latter merging into the corresponding lateral wall sections of the cuboid snorkel section 2. Curved inside the cuboid snorkel section 2 goes directly into the mouth 4.

The curvature outer side wall portion of the curved snorkel portion 3 is formed by a hinged lid 5 which is pivotally articulated to a vertically upper edge portion 7 of the mouth 4 by means of a hinge joint 6. The hinged lid 5 can be pivoted upward in a typical installation position against its weight, whereby an opening 8 is released to the vicinity of the intake snorkel (eg engine compartment). By its pivotal mounting of the hinged lid 5 between a closed position in which it sealingly abuts the opening 8, and an opening position in which it releases the opening 8, are moved.

The opening 8 of the curved snorkel section 3, which can be opened by the hinged lid 5, is arranged on the opposite side of the orifice 4 in the flow direction of the inflowing air flow. The opening 8 extends here from the hinge joint 7 for hinging the hinged lid 5 to the transition of the curved snorkel section 3 in the cuboid snorkel section. 2

The intake snorkel 1 is installed in a typical installation position in a motor vehicle so that the mouth 4 can receive the airstream of the moving in normal driving motor vehicle. For this purpose, the intake snorkel 1 is located for example in a front end of the motor vehicle and the mouth 4 is directed frontward. In this way, a first air flow is generated with a first flow direction in the intake snorkel 1, which impinges without reversal of its flow direction with overpressure on the hinged lid 5 and this, if the dynamic pressure generated here is greater than the weight of the hinged lid 5, can pivot outwards and upwards, whereby the opening 8 is released.

If the hinged lid 5 passes through the back pressure of the adjacent first air flow in an approximately horizontal position, the opening 8 is fully released. In this position of the hinged lid 5, the effective cross-sectional area of the opening 8 released in the flow direction is approximately as large as the cross-sectional area of the orifice 4. If the hinged lid 5 is in an intermediate position between its closed position and its maximum open position, the effective cross-sectional area of the opening 8 is In contrast, reduced.

If the hinged lid 5 is pivoted upward by the first air flow flowing with overpressure and the opening 8 is released, the first air flow and in particular transported in the air flow dust particles and water droplets are loosened due to their inertia through the opening 8 and thus from the air intake. If 5 combustion air is sucked to the engine simultaneously with open hinged lid, so this is a second air flow with one of the first flow direction sucked in different second flow direction, which has already been cleaned by the inertia filtering. First and second flow directions take approximately at an angle of 90 ° to each other.

The hinged lid 5 is formed in section circular segment-shaped, wherein the hinged lid 5 in accordance with its use as a curvature outside-side wall portion of the curved snorkel section 3 in this case follows approximately a quarter circle. In the open position of the hinged lid 5 of the hinged lid 5 inflowing first air flow is deflected by the bowl-shaped spatial shape of the hinged lid 5 in the direction of the cuboid snorkel section 2. In this way, the suction of the filtered combustion air is facilitated in the internal combustion engine.

The voltage applied to the hinged lid 5 dynamic pressure of the first air flow counteracts the gravity of the hinged lid 5 and the force exerted on the hinged lid suction when sucking the second air flow into the internal combustion engine. If the force exerted on the hinged lid 5 summed force of weight and dynamic suction exceeds the dynamic pressure by wind, the hinged lid 5 closes the opening 8. Through the mouth 4 of the intake snorkel 1 then relatively cool combustion air is sucked in the front region of the motor vehicle, so that in an advantageous In a stationary or low-speed vehicle, no relatively warm recirculation air in the engine compartment can be sucked.

LIST OF REFERENCE NUMBERS

1

intake snorkel

2

cuboid snorkel section

3

curved snorkel section

4

muzzle

5

hinged lid

6

hinge

7

mouth portion

8th

opening

9

Side wall

Claims (11)

An intake snorkel (1) of an air intake tract for drawing in combustion air for an internal combustion engine of a motor vehicle, having an opening (8) and a closure element (5) associated with the opening, between a closing position closing the opening (8) and an opening releasing the opening (8) Opening position is movable and held with a selectable force in the closed position, wherein the closure element (5) is arranged so that it can be flowed by a in the suction snorkel (1) entering the first air flow with overpressure and by a pressure exerted by the first air flow back pressure in his Opening position can be brought. A suction snorkel according to claim 1, wherein the closure element (5) is arranged in the region of a flow direction changing section (3) in which a first flow direction of the first air flow flowing over the intake snorkel (1) into a second flow direction of a second air flow sucked to the internal combustion engine will be changed. An intake snorkel according to any one of claims 1 to 2, wherein the closure element (5) is disposed on a side opposite to an orifice (4) of the intake snorkel (1) in the first flow direction. An intake snorkel according to any one of claims 1 to 3, wherein the closure element (5) is pivotably articulated to the remainder of the intake snorkel. An intake snorkel according to any one of claims 1 to 4, wherein the closure member (5) is pivotably articulated near the mouth (4) on the intake snorkel. A suction snorkel according to one of Claims 1 to 5, in which the closure element (5) can be brought into its closed position by the force of gravity acting on it. Suction snorkel according to one of claims 2 to 6, wherein the closure element (5) is provided on its flowed by the first air flow side with a curved surface, such that in the open position of the closure element, the flow direction of the closure element inflowing air flow in the direction of the second flow direction is diverted. A suction snorkel according to any one of claims 2 to 7, wherein the first flow direction and the second flow direction are at an angle of about 90 ° to each other. Air intake tract for an internal combustion engine of a motor vehicle with a suction snorkel for drawing in combustion air according to one of claims 1 to 8. Motor vehicle with an air intake tract for an internal combustion engine for driving the motor vehicle with a suction snorkel for drawing in combustion air according to one of claims 1 to 8. Motor vehicle according to claim 10, wherein an opening (4) of the intake snorkel is arranged so that it can absorb wind of the moving motor vehicle.

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