DE202019106299U1 - Air supply line for coupling to an air consumer in a motor vehicle, arrangement for air supply and use of an air supply line - Google Patents

Abstract

Air supply line for coupling to an air consumer in a motor vehicle, preferably a drive of the motor vehicle, such as an internal combustion engine or a fuel cell
- Two channels (12, 13) extending from a pressure side (2) to a suction side (3) of the air supply line facing the air consumer; and
- A wall (11) separating the two channels (12, 13) and having at least one cavity (14); wherein the separating wall (11) has at least one access hole (15, 16) between at least one of the two channels (12, 13) and the at least one cavity (14).

Description

The invention relates to an air supply line for coupling to an air consumer in a motor vehicle, an arrangement for supplying air for an air consumer of a motor vehicle and the use of an air supply line.

For correct functioning, it is necessary to supply a drive of a motor vehicle, such as an internal combustion engine or a fuel cell, with intake air as combustion air or as oxidation air. In connection with internal combustion engines, it is particularly known to provide an air supply which guides the intake air into the engine. The intake air can come from a turbocharger, which builds up a specific overpressure depending on the engine design. The air supply must withstand this overpressure.

Depending on the spatial conditions in the engine compartment of a motor vehicle, multi-part system solutions can be used for air supply, which deviating from a round cross-sectional shape can be wide and flat. The deviation from a round cross-section can reduce the resistance to the forces caused by an increased internal line pressure. For example, if the pressure of the guided air is higher than that of the surroundings, the air supply can be damaged by inflation.

The document DE 10 2007 039 292 A1 discloses a multi-chamber flat tube for use in a heat exchanger, for example for exchanging heat between an exhaust gas and / or a charge air and a coolant. The flat tube has at least two chambers to absorb the flow of a fluid. The multi-chamber flat tube is produced by forming a sheet metal strip. In this case, a closed profile is formed by opposing wide walls which are connected to one another via opposing narrow walls each forming a deformation area, the wide and narrow walls forming outer sides of the profile. A first wide wall is formed with an inner section of the sheet metal strip lying between side sections of the sheet metal strip, and a second wide wall is formed with side sections of the sheet metal strip arranged to the side of the inner section. The first and second wide walls are connected to a web which separates the at least two chambers and forms an inner side of the profile.

With the known multi-chamber flat tube, a relatively stable fluid line is created. However, the construction of a sheet metal bent lengthways greatly restricts the freedom of design. In this way, bends across the longitudinal direction of the pipe can hardly be achieved. In addition, common sheets are made of metals, which makes weight optimization difficult.

If the cross-section of the air supply changes along its course, the air can be stimulated to vibrate by turbulence, which is radiated as a noise via the outer wall of the air supply into the engine compartment and can get into the passenger compartment, where it can be heard as annoying noise.

In the document IN 2010 00873 I3 describes a muffler for an exhaust which has an outer shell into which exhaust gases can enter through an inlet pipe and exit through an outlet pipe. The outer shell is divided into several interconnected chambers by diffuser plates. In addition, a central tube is arranged in the outer shell, which is in fluid connection with the outer tube and on which perforated baffles are arranged, which form sub-chambers. With this arrangement, exhaust gas is fed to the outlet pipe and is attenuated in the process.

The document CN 2433392 Y Fig. 3 shows a sound attenuating cleaning device for automobile exhaust gases. A pipe section set up for soundproofing is connected to a surrounding pipe by means of perforations. In addition, perforated plates are arranged in the pipe section.

In the known devices for sound absorption, complicated arrangements of different components in a pipe structure are necessary in order to achieve the desired sound-damping effect. As a result, their use is not possible or only possible under great circumstances, especially in environments in which flat and wide cables are used for reasons of space.

The object of the invention is to overcome the disadvantages of the prior art and to provide improved technologies for air supply lines for an internal combustion engine of a motor vehicle, in which, in particular, a compact and stable structure and simultaneous soundproofing are made possible.

The object is achieved by the subject matter of the independent claims 1, 19 and 22. Refinements are the subject matter of the dependent claims.

According to one aspect of the invention, an air supply line for coupling to an air consumer in a motor vehicle, preferably a drive of the motor vehicle, such as an internal combustion engine or a fuel cell, is created. The air consumer is a functional unit of the Motor vehicle that consumes air during operation. In particular, the air consumer using air and additional use and consumption of a fuel - such as gasoline, diesel, hydrogen, methanol, butane, natural gas or comparable fuels - can convert an energy stored in the fuel in the form of chemical energy into another form of energy, which is used for Drive of the motor vehicle is usable. For example, the air consumer can convert the chemical energy into thermal or electrical energy, which is then converted into kinetic energy to drive the motor vehicle. For the energy conversion, the air consumer can in particular be designed as an internal combustion engine, such as an internal combustion engine, or as a fuel cell.

The air supply line has two channels leading from a pressure side to a suction side of the air supply line facing the air consumer. Furthermore, the air supply line has a wall separating the two channels with at least one cavity. The separating wall has at least one access hole between one of the two channels and the at least one cavity.

With the air supply line according to the invention, sound attenuation is made possible in a compact and stable structure. The wall separating the channels has a stabilizing effect. In particular with flat cross-sections of the air supply line, which can be advantageous in the context of efficient air routing in the smallest of spaces, the separation of the air supply line by the wall into two channels (compared to the flat overall cross-section of the air supply line) leads to an approximation of the respective channel cross-section to a circular shape and thus to an increase in the stability of the air supply line, in particular against deformation due to an increased internal pressure. In this context, an approximation of a circular shape can also mean, for example, a rectangular shape in which the aspect ratio is more balanced than in the overall cross-section of the air supply line. Here, the wall acts as a strain relief between an upper side and a lower side of the air supply line. Surprisingly, it has been shown that the wall separating the channels can simultaneously serve for efficient sound attenuation. For this purpose, the separating wall has a cavity and an access hole which connects one of the two channels with the cavity. A damping system based on the principle of a Helmholtz resonator is thus created. The access hole and the cavity form a spring-mass system in which the volume of air in the access hole forms the mass and the volume in the cavity forms the spring. Noise-causing vibrations of the moving air in the at least one of the two channels, which is connected to the cavity by means of the access hole, stimulate the spring-mass system to vibrate, as a result of which the vibrations of the air in the at least one of the two channels are dampened and the unwanted noise is reduced. By appropriately dimensioning the access hole and the cavity - i.e. the mass and the spring - the damping effect, in particular the damping frequency or resonance frequency of the spring-mass system, can be applied to the vibrations caused by changes in direction and cross-section of the at least one channel during operation of the air supply line , in particular the frequencies that are expected to occur. The acoustic damping is thus optimized.

For coupling to the air consumer, the air supply line can in particular have corresponding mechanical connections on the suction side. Accordingly, the air supply line can have mechanical connections on the pressure side for coupling to an air supply device. The air supply device can in particular be a ventilation opening or a compressor, for example a turbocharger or (air) compressor. In this way, the air supply line can be set up to supply a drive of a motor vehicle with air from a ventilation opening or a compressor in order to enable the drive of the motor vehicle.

In comparison to the two channels, the at least one cavity does not lead from the pressure side to the suction side of the air supply line, so it is not suitable for direct air routing through the air supply line. In particular, the at least one cavity can be formed without a direct opening to the pressure side and / or to the suction side of the air supply line and / or not extend over the entire length of the air supply line. The at least one cavity can extend over the entire height or only part of the height of the separating wall and over the entire length or only part of the length of the separating wall. In particular, the separating wall can have at least one cavity over part of its height and / or its length and otherwise be designed as a simple wall.

The two channels can be set up to guide air that is subjected to an increased pressure in relation to an ambient pressure. Shaping, dimensioning (for example of cross-sectional dimensions and wall thicknesses) and material selection can be made in such a way that the two channels are each adapted to a pressure of the air to be transported, i.e. withstand this pressure, as determined by the design of the air consumer and, if applicable, the air supply device in the respective channel can occur. Thus, in the case of an internal combustion engine as the air consumer and a turbocharger as the air supply device, the Channels to be adapted to the desired air inlet pressure of the internal combustion engine and the required air outlet pressure of the turbocharger.

The separating wall can be a stiffening structure. In particular, the wall can be set up to produce a respective optimized cross section of the channels and to absorb tensile forces between an upper side and a lower side of the air supply line, which result from an excess pressure of the air in the air supply line. For this purpose, the shape, dimensioning and material selection of the separating wall can be adapted to the pressure of the air to be transported. In this context, what has been said about adapting the channels to the pressure of the air to be transported applies accordingly.

The wall can have at least one further access hole between the other of the two channels and the at least one cavity of the separating wall. In this way, two spring-mass systems can be formed, in which the spring is each formed by the cavity volume and the mass of one spring-mass system is formed by the volume of the one access hole between one of the two channels and the cavity is formed, while the mass of the second spring-mass system is formed by the volume of the further access hole between the other of the two channels and the cavity. In this way, vibrations in the air in both channels and thus undesirable sound developments in both channels can be dampened.

The separating wall can have at least two cavities. Here, the two cavities of the separating wall can be arranged one behind the other along the course of the air supply line from the pressure side to the suction side and separated from one another by a cavity partition. In this way, the two cavities within the separating wall can be formed separately from one another. In particular, the two cavities can form separate volumes which have different properties and can thus be used separately for sound absorption.

The separating wall can have at least one access hole between one of the two cavities and one of the two channels and / or the other of the two channels, the separating wall between the other of the two cavities and one of the two channels and / or the other of the two channels each having at least one access hole. In this way, different configurations of an air supply line can be created. In such a configuration, both cavities are each connected to one of the two channels via at least one access hole. In a further configuration, one of the two cavities is connected to one of the two channels via at least one access hole, while the other of the two cavities is connected to the other of the two channels via at least one access hole. In one possible configuration, at least one of the two cavities is connected to both channels via at least one access hole in each case. In such a configuration, the other of the two cavities can be connected to one of the two channels or to both channels via at least one access hole in each case.

The separating wall of the air supply line can have further cavities, which are each connected to one or two channels via at least one access hole. The further cavities can also be arranged one behind the other along the course of the air supply line from the pressure side to the suction side and separated from one another by a cavity partition. A separate spring-mass system for damping can be formed over each cavity in connection with the assigned access holes to one of the two channels. Here, a cavity can be part of several spring-mass systems, in particular the spring of a spring-mass system in which the at least one access hole to one of the two channels forms the mass and the spring of a further spring-mass system in which the at least one access hole to the other of the two channels forms the ground.

The different spring-mass systems can be coordinated with one another in such a way that different frequencies are damped in one or both channels via different spring-mass systems (i.e. different cavities) (in particular via differently configured spring-mass systems with different damping frequencies) and / or a greater damping of a certain frequency is achieved in one or both channels via several spring-mass systems (for example by providing several spring-mass systems for damping the same frequency).

To form different spring-mass systems, a number of access holes can be selected for each connection between a channel and a cavity, that is to say in particular several access holes, for example at least two access holes. The damping frequency, or resonance frequency, of a spring-mass system is essentially also determined by the moving mass, which is formed by the volume of air in the at least one access hole belonging to the spring-mass system. The moved mass is thus determined by the total volume of air moved, i.e. by the sum of the air volumes of all the spring-mass System of associated access holes. In the case of the same cross-sections of all access holes of a spring-mass system, the volume of air moved is the product of the cross-sectional area of an access hole (determined by the diameter in the case of a circular cross-section), the wall thickness of the separating wall and the number of access holes.

The number of access holes in a spring-mass system can, depending on the desired damping frequency, be different from the number of access holes in another spring-mass system. The number of access holes and the size of the volume of the associated cavity then determine the resonance frequency. Depending on the frequency to be damped, a ratio between the cavity volume and the number of access holes of a channel per cavity (for a given cross section) can be determined, which leads to a desired damping frequency (resonance frequency of the spring-mass system). Correspondingly, the air supply line can be designed in such a way that the ratio between the volume of a cavity and the volume which is enclosed by the access holes connecting this cavity with one of the two channels corresponds to a frequency which is to be attenuated with respect to one of the two channels.

Depending on the routing and the cross-sectional profile of the air supply line, damping of air vibrations can only be provided with respect to one of the two channels. For this purpose, only this channel can be connected to one or more cavities in the separating wall through at least one access hole in each case. This can be the case in particular if, in particular due to the geometric configuration of the air supply line, the occurrence of undesirable air vibrations, i.e. undesirable noise generation, is to be expected to a considerable extent only with regard to one of the two channels.

Alternatively, depending on the location and the frequency of the air vibrations to be expected with respect to the respective channel, different attenuation can be provided for the channels at different locations along the course of the air supply line. In particular, depending on the required damping frequency and strength, one or both channels can be connected to a correspondingly shaped cavity at different positions along the course of the air supply line, each with at least one access hole of a corresponding shape and number. In this way, the air supply line can be set up for the attenuation of different frequencies at different positions for the two channels.

The at least one access hole can have a round (circular) cross section with a diameter of at least 1 mm to a maximum of 10 mm. The diameter can preferably be at least 2 mm to a maximum of 5 mm, more preferably at least 3 mm to a maximum of 3.5 mm. Different access holes can have different cross sections, in particular round cross sections with different diameters. In this case, all access holes which connect a cavity with one of the two channels preferably have the same cross section, in particular a round cross section with the same diameter. Here, the cross section for different cavities and / or the connection with different channels, that is to say for each spring-mass system, can vary, in particular as a function of a damping frequency to be achieved. The relative deviation between the diameters of access holes with circular cross-sections of different sizes can be up to 50% and more.

The at least one access hole can be a bore. In particular, all access holes can have a round cross-section and can be made in the separating wall by means of drilling. In this case, the bores belonging to a spring-mass system are preferably made with the same drilling tool, so that they have the same cross-section (diameter).

A minimum wall thickness between the at least one cavity and at least one of the two channels can be at least 1 mm to a maximum of 10 mm. The minimum wall thickness is preferably at least 2.5 mm to a maximum of 6 mm, more preferably at least 3 mm to a maximum of 4 mm. Here, the minimum wall thickness is the smallest occurring distance between the cavity, that is to say any point in the volume of the cavity, and the at least one of the two channels, that is to say any point in the volume of the channel. In particular, the minimum wall thickness can be the smallest thickness of the separating wall perpendicular to its course between the at least one cavity and the at least one of the two channels. Preferably, the thickness of the separating wall perpendicular to its course between the at least one cavity and the at least one of the two channels essentially continuously corresponds to the minimum wall thickness, with thickenings being able to be provided in particular in edge areas and / or particularly mechanically stressed areas. The statements relating to the minimum wall thickness between the at least one cavity and the at least one of the two channels apply accordingly to the other of the two channels and / or to other cavities.

The at least one cavity and the at least one access hole between the one of the two channels and the at least one cavity can have the same cross section. In this way, the at least one access hole and the at least one cavity can be connected without a recognizable transition and thus form a blind hole or blind hole. In particular, the at least one access hole and the at least one cavity can be formed with a single formation protruding into the separating wall. For example, the at least one access hole and the at least one cavity can be formed by means of a blind bore. In such an embodiment, the at least cavity has essentially the same cross section as the access hole, with a drill cone additionally being able to be arranged at the end of the blind hole for production reasons. Alternatively, the at least one access hole and the at least one cavity can be formed jointly by plunge milling so that they have the same cross section. As a further alternative, the at least one access hole and the at least one cavity can be produced by means of another production process, for example in a casting process during the production of the separating wall. If the at least one cavity and the at least one access hole between the one of the two channels and the at least one cavity have the same cross section, a resonance effect is achieved using the depth of the resulting formation. Here, the at least one cavity is only connected to one of the two channels. In such an embodiment, further cavities can be provided which are connected to one or the other of the two channels by a respective access hole with the same cross-section.

The at least one cavity and / or the at least one access hole can be filled with a damping material. In particular, the properties of the spring-mass system can be adjusted by means of a filling with damping material, the filling of the access hole essentially determining the properties of the mass and the filling of the cavity essentially determining the properties of the spring. A filling with damping material is preferably provided to adjust the spring action of the cavity. Any material that influences the properties of the spring-mass system in accordance with the desired damping properties can be used as the damping material. In particular, elastic materials or material compositions such as natural or synthetic rubber, other elastomers, fiber materials such as wood or textile, mineral wool, steel wool and / or similar materials can be used as damping material. A filling with damping material can be provided for individual, all or any combinations of cavities and / or access holes, depending on the required damping properties of the corresponding spring-mass systems.

The air supply line can be rigid. In this context, a rigid air supply line is to be understood as meaning that the air supply line essentially retains its shape under the loads occurring during operation, with relatively minor deformations, for example a small change in cross section under pressure or a temporary / reversible bending, torsion or other deformation, in particular due to vibrations. The air supply line is preferably designed as a pipeline.

The air supply line can consist of a plastic. The air supply line preferably consists of a thermoplastic material such as polyamide, for example polyamide with glass fiber reinforcement. Polyamide 6 and / or polyamide 66 can be used as the material for the air supply line, whereby a glass fiber content between 10% and 40% can be provided in each case.

In alternative embodiments, the air supply line can consist entirely or partially of another material, such as a metallic material, for example cast aluminum.

The air supply line can have an upper half-shell and a lower half-shell, which are connected to one another to form the air supply line. Here, the upper and the lower half-shell can each form part of the two channels. In particular, the upper half-shell can form a respective upper part of the two channels and the lower half-shell can form a respective lower part of the two channels. Thus, the upper half-shell and the lower half-shell in a connected or assembled state can form the two channels of the air supply line.

The upper half-shell and the lower half-shell can be welded to one another. In particular, the upper and lower half-shells can be welded to one another along connecting lines in such a way that closed cross-sectional profiles are formed perpendicular to the connecting lines. As a result, closed cross-sectional profiles, in particular of the two channels and / or at least one cavity, can be formed, which consist of partial profiles formed by the cross-sections of the half-shells, which at points formed by the projection of the connecting line into the cross-sectional area (or lines with the length the profile thickness) are connected to one another, in particular by welding. Alternatively or in addition, the upper and lower half-shell can be placed on one be connected to one another in a different way, for example by gluing, clamping, screwing and / or a form fit.

The separating wall can be formed with a shape of the upper half-shell and / or the lower half-shell. For example, the wall can be formed by means of a molding of only one half-shell and can be connected to the other half-shell when the half-shells are connected. Alternatively, a part of the wall can be formed as a respective shape of the upper half-shell and the lower half-shell and the parts of the wall can be connected when the half-shells are connected to form the wall. As a further alternative or in addition, at least part of the separating wall can be provided as a separate component from the half-shells, which is connected when the half-shells are connected to them, possibly with a part of the wall formed by the corresponding half-shell, in order to form the separating wall .

The air supply line can have a flattened cross section. A flattening can be provided here in particular with respect to a circular or square cross section. Here, the two channels in the air supply line can be separated from one another by means of the separating wall in such a way that the two channels each have a cross-section that is flattened to a lesser extent than the air supply line in its entirety. The two channels can have the same cross section, at least in sections, in particular in at least a partial section of the air supply line in which the air supply line runs straight. In other sections of the air supply line or alternatively as a whole, the two channels of the air supply line can have different cross-sections. The cross-section of the air supply line and the respective cross-sections of the two channels can be adapted to the spatial conditions at the planned location, in particular a drive room of a motor vehicle, and the required functionality, in particular the air flow to be supplied to the air consumer. Here, the respective cross-sections can be variable, in particular along the course of the air supply line. In this way, the air supply line can be adapted to spatial conditions at the place of use which vary along its course and which, in particular, can require different cross-sections of the two channels. A respective change in cross section of the two channels can be the same or different. With an identical change in the cross-section of the two channels, the two channels can have, at least in sections, a cross-section which is variable along the course but which is identical to one another.

The air supply line can comprise at least one additional channel extending from the pressure side to the suction side. Any number of additional channels extending from the pressure side to the suction side can be provided here. Depending on the arrangement of the at least one further channel, the air supply line can comprise at least one further separating wall, which can have at least one further cavity and at least one further access hole between the at least one further cavity and one of the channels of the air supply line. The above statements with regard to the two channels, the separating wall, the cavities and the access holes apply accordingly to the case of at least one additional channel and possibly corresponding separating walls, cavities and access holes. In particular, by providing at least one additional channel, an (additional) approximation of each individual channel to a round cross-section can also be achieved for a greatly flattened overall cross-section of the air supply line. In this way, even under (further) difficult structural boundary conditions, a compact, stable structure of an air supply line with simultaneous efficient sound absorption can be achieved.

In connection with an air supply line comprising an upper half-shell and a lower half-shell, a method for producing an air supply line according to at least one of the embodiments of the disclosure is provided. The method comprises providing an upper half-shell and a lower half-shell, which each provide a partial profile of the air supply line, joining the lower half-shell and the upper half-shell to form the air supply line, and connecting the lower half-shell to the upper half-shell. The method for producing an air supply line can additionally include providing at least one further component, joining the upper and lower half-shells with the at least one further component to form the air supply line and connecting the lower and upper half-shells and the at least one further component. When the lower and upper half-shells and the at least one further component are joined together, the at least one further component can be arranged between or within the half-shells and / or outside on at least one of the half-shells. The connection of the upper half-shell and the lower half-shell and optionally the at least one further component can be carried out by means of welding. Alternatively or additionally, the connection can take place by means of other methods, for example by gluing, clamping, screwing and / or by means of a form fit. To form the air supply line, the upper half-shell and the lower half-shell as well optionally the at least one further component form partial profiles of the air supply line and are joined together to form the profile of the air supply line. Individual components of the air supply line, for example the separating wall, can in this case be provided by one or more of the upper half-shell and the lower half-shell and, if appropriate, by at least one further component. For the components provided by means of the upper half-shell and / or the lower half-shell or, if applicable, the at least one further component, the statements on the design of the air supply line apply accordingly.

According to a further aspect of the invention, an arrangement for supplying air for an air consumer of a motor vehicle is created. The arrangement comprises an air supply device, such as a compressor or a suction device, an air supply line designed in particular according to the above statements, and an air consumer, preferably a drive for the motor vehicle, such as an internal combustion engine or a fuel cell. The air supply line is connected to the air supply device in such a way that air from the air supply device can enter the two channels of the air supply line. The air supply line is connected to the air consumer in such a way that air can exit from the two channels of the air supply line and enter the air consumer.

With the arrangement according to the invention, a possibility is created to supply an air consumer in a motor vehicle with air and to use the properties of the air supply according to the invention in order to achieve a compact and stable arrangement in the motor vehicle that includes the air consumer while at the same time efficiently damping noise caused by the air duct guarantee. In particular, the air consumer in a drive compartment of the motor vehicle can be supplied with air, the air duct being adapted to the spatial conditions in the drive compartment by means of the air supply line according to the invention, i.e. in particular through constrictions and along other components of the motor vehicle, and at the same time being sufficiently stable and efficient Sound attenuation is achieved.

The air supply device can be a ventilation opening. For example, the air supply device can be a ventilation opening, for example in the form of a grille or a so-called radiator grille, on the outer wall of the drive compartment of the motor vehicle, from which air is to be directed to the air consumer.

Alternatively, the air supply device can be a compressor. The compressor is preferably a turbocharger or a compressor. In this way, compressed air can be supplied to the air consumer. In combustion engines, for example, improved performance can be achieved by supplying them with compressed air. This is done, for example, by means of a turbocharger or a compressor. Fuel cells are also dependent on an appropriately designed air supply, which can be optimized by means of a compressor, for example a compressor. In this case, the air supply line according to the invention ensures a corresponding stability under the prevailing air pressures and possibly increased temperatures with simultaneous suppression of undesired noise development.

According to yet another aspect of the invention, use of an air supply line designed in particular according to the above statements is created, with air being supplied from the pressure side to the suction side of the air supply line through the two channels to an air consumer, preferably a drive such as an internal combustion engine or a fuel cell, of a motor vehicle becomes. By using the air supply line according to the invention, an efficient air supply to the air consumer is ensured, a compact and stable structure being achieved and undesired noise generation in the air supply line being dampened.

When used, the air supplied to the air consumer of a motor vehicle can be subjected to a pressure that is higher than ambient pressure. The air can be supplied to the air consumer by a compressor, preferably a turbocharger or compressor. This allows an improved performance of the air consumer to be achieved. For an air consumer, this takes place in the form of an internal combustion engine, for example by means of a turbocharger or a compressor. A correspondingly optimized air supply by means of a compressor, for example a compressor, can also be achieved for fuel cells. The use of the air supply line according to the invention ensures a corresponding stability under the prevailing air pressures and possibly increased temperatures with simultaneous damping of undesired noise development.

According to the disclosure, a method for operating a motor vehicle, in particular a method for damping undesired noises when operating a motor vehicle, is created. The method comprises the provision of an air supply line designed in particular in accordance with the above statements; the coupling of the suction side of the Air supply line to an air consumer, preferably a drive, such as an internal combustion engine or a fuel cell, of a motor vehicle; and the supply of air from the pressure side of the air supply line through the two channels of the air supply line to the air consumer. The method can further include coupling the pressure side of the air supply line to an air supply device, such as a compressor, in particular a turbocharger or a compressor, or a suction device, and supplying air from the air supply device through the two channels of the air supply line to the air consumer. The air supplied to the air consumer through the two channels of the air supply line can be subjected to a pressure which is higher than that of an ambient pressure. With regard to the method for operating a motor vehicle, in particular for damping undesired noises when operating a motor vehicle, the statements on the configurations of the air supply line, the air supply arrangement for an air consumer of a motor vehicle and the use of an air supply line apply accordingly.

• 1 eine schematische Darstellung einer Luftzuführleitung zur Kopplung an einen Luftverbraucher eines Kraftfahrzeugs;
• 2 eine schematische Darstellung der Luftzuführleitung gemäß 1 aus einer anderen Perspektive;
• 3 eine schematische Perspektivdarstellung einer Luftzuführleitung zur Kopplung an einen Luftverbraucher eines Kraftfahrzeugs im Schnitt;
• 4 eine schematische Perspektivdarstellung einer weiteren Luftzuführleitung zur Kopplung an einen Luftverbraucher eines Kraftfahrzeugs im Schnitt;
• 5 eine schematische Querschnittsdarstellung einer Luftzuführleitung zur Kopplung an einen Luftverbraucher eines Kraftfahrzeugs;
• 6 eine schematische Querschnittsdarstellung einer anderen Luftzuführleitung zur Kopplung an einen Luftverbraucher eines Kraftfahrzeugs;
• 7 eine schematische Querschnittsdarstellung einer weiteren Luftzuführleitung zur Kopplung an einen Luftverbraucher eines Kraftfahrzeugs;
• 8 eine schematische Längsschnittdarstellung der Luftzuführleitung gemäß 7;
• 9 eine schematische Perspektivdarstellung eines Schnitts durch eine Luftzuführleitung zur Kopplung an einen Luftverbraucher eines Kraftfahrzeugs;
• 10 eine schematische Querschnittsdarstellung einer Luftzuführleitung zur Kopplung an einen Luftverbraucher eines Kraftfahrzeugs;
• 11 eine schematische Querschnittsdarstellung einer anderen Luftzuführleitung zur Kopplung an einen Luftverbraucher eines Kraftfahrzeugs;
• 12 eine schematische Querschnittsdarstellung einer weiteren Luftzuführleitung zur Kopplung an einen Luftverbraucher eines Kraftfahrzeugs;
• 13 eine schematische Querschnittsdarstellung noch einer weiteren Luftzuführleitung zur Kopplung an einen Luftverbraucher eines Kraftfahrzeugs;
• 14 eine schematische Darstellung einer Luftzuführleitung zur Kopplung an einen Luftverbraucher eines Kraftfahrzeugs im Querschnitt;
• 15 eine schematische Darstellung einer anderen Luftzuführleitung zur Kopplung an einen Luftverbraucher eines Kraftfahrzeugs im Querschnitt;
• 16 eine schematische Darstellung einer weiteren Luftzuführleitung zur Kopplung an einen Luftverbraucher eines Kraftfahrzeugs im Querschnitt;
• 17 eine schematische Darstellung noch einer weiteren Luftzuführleitung zur Kopplung an einen Luftverbraucher eines Kraftfahrzeugs im Querschnitt;
• 18 eine alternative Ausführungsform einer Luftzuführleitung zur Kopplung an einen Luftverbraucher eines Kraftfahrzeugs in schematischer Querschnittsdarstellung; und
• 19 eine schematische Querschnittsdarstellung einer weiteren alternativen Ausgestaltung einer Luftzuführleitung zur Kopplung an einen Luftverbraucher eines Kraftfahrzeugs.

Further features and advantages of the invention are made clear by the following description of preferred embodiments according to the accompanying figures, in which:

• 1 a schematic representation of an air supply line for coupling to an air consumer of a motor vehicle;
• 2 a schematic representation of the air supply line according to 1 from a different perspective;
• 3 a schematic perspective illustration of an air supply line for coupling to an air consumer of a motor vehicle in section;
• 4th a schematic perspective illustration of a further air supply line for coupling to an air consumer of a motor vehicle in section;
• 5 a schematic cross-sectional view of an air supply line for coupling to an air consumer of a motor vehicle;
• 6th a schematic cross-sectional view of another air supply line for coupling to an air consumer of a motor vehicle;
• 7th a schematic cross-sectional view of a further air supply line for coupling to an air consumer of a motor vehicle;
• 8th a schematic longitudinal sectional view of the air supply line according to FIG 7th ;
• 9 a schematic perspective illustration of a section through an air supply line for coupling to an air consumer of a motor vehicle;
• 10 a schematic cross-sectional view of an air supply line for coupling to an air consumer of a motor vehicle;
• 11 a schematic cross-sectional view of another air supply line for coupling to an air consumer of a motor vehicle;
• 12th a schematic cross-sectional view of a further air supply line for coupling to an air consumer of a motor vehicle;
• 13th a schematic cross-sectional illustration of yet another air supply line for coupling to an air consumer of a motor vehicle;
• 14th a schematic representation of an air supply line for coupling to an air consumer of a motor vehicle in cross section;
• 15th a schematic representation of another air supply line for coupling to an air consumer of a motor vehicle in cross section;
• 16 a schematic representation of a further air supply line for coupling to an air consumer of a motor vehicle in cross section;
• 17th a schematic representation of yet another air supply line for coupling to an air consumer of a motor vehicle in cross section;
• 18th an alternative embodiment of an air supply line for coupling to an air consumer of a motor vehicle in a schematic cross-sectional view; and
• 19th a schematic cross-sectional illustration of a further alternative embodiment of an air supply line for coupling to an air consumer of a motor vehicle.

In the representations of the different versions, features of the same type are denoted by the same reference symbols.

The 1 and 2 each show a schematic representation of an air supply line 1 for coupling to an air consumer of a motor vehicle from different perspectives. In the embodiment shown, the air supply line is a pipeline and is designed to guide compressed air from a turbocharger to an internal combustion engine of a motor vehicle. For this purpose, the Pressure supply line 1 on one print side 2 can be coupled to a turbocharger and on a suction side 3 can be coupled to an internal combustion engine. The air supply line 1 is from a lower half-shell 4th and an upper half-shell 5 composed. The upper half-shell 5 is particularly in the representation of the 2 recognizable. The upper half-shell 4th and the lower half-shell are made of glass fiber reinforced polyamide. The lower half-shell 4th has a formation 6th on, which forms a separating wall. In the design of the 1 and 2 forms the formation 6th a cavity open to the environment 7th .

The lower half-shell 4th and the upper half-shell are at their points of contact 8th welded together. Furthermore, the top of the formation 6th in the lower half-shell 4th with the upper half-shell 5 welded. The weld seam is on the top of the upper half-shell as a recess 9 recognizable.

As in the 1 and 2 can be seen, the air supply line 1 has a cross-section that is flattened in relation to a circular shape and is curved along its course. The air supply line is adapted to the spatial conditions in the engine compartment of the motor vehicle in order to enable air to be guided.

The 3 shows a schematic perspective illustration of an air supply line 30th for coupling to an air consumer of a motor vehicle in section. The air supply line 30th is from a lower half-shell 4th and an upper half-shell 5 formed, which at their circumferential points of contact 8th as well as on the top 10 a formation 6th the lower half-shell 4th are welded together. With the molding 6th the lower half-shell 4th is a wall 11 with a cavity that is open at the bottom 7th educated. The wall 11 divides the total cross-section of the air supply line 30th in two channels 12th , 13th , which are each from a print page 2 to a suction side 3 the air supply line 30th extend. The wall 11 decreases due to the air pressure inside the ducts, which is higher than the external pressure 12th , 13th resulting tensile forces and thereby improves the stability of the air supply line 30th , especially their resistance to increased internal pressures even at increased temperatures.

In the 4th is a schematic perspective view of a further air supply line 40 for coupling to an air consumer of a motor vehicle shown in section. Compared to that in the 3 The embodiment shown has the lower half-shell 4th the air supply line 40 a downwardly closed formation, which after welding with the upper half-shell 5 along the two lines of contact in the embodiment shown 10 a wall 11 between the channels 12th , 13th the air supply line 40 forms. Here the wall 11 a closed cavity 14th on. It should be noted that the closed cavity 14th no further channel forms, since the shape of the lower half-shell 4th and thus the cavity 14th to the print side 2 and to the print side 3 the air supply line 40 is completed (in this respect corresponding to the ends of the loft 6th the air supply line 1 according to the 1 and 2 ).

According to the 5 The embodiment shown has the air supply line 50 an upper half-shell 5 on, which is formed with a molding that after welding to the lower half-shell 4th a separating wall 11 between the channels 12th , 13th trains. The dividing wall 11 has a cavity 14th on that by means of access holes 15th in the form of bores with the channel 12th connected is. The mass of through the access holes 15th The enclosed volume of air thus forms part of a spring-mass system, the spring of which is caused by the volume of air in the cavity 14th is formed. Air vibrations caused by changes in cross-section and / or direction of the air supply line 50 in the channel 12th arise and are perceptible as disruptive sound in the motor vehicle, stimulate the spring-mass system to vibrate. This causes the air vibration in the duct 12th muffled and the disturbing sound reduced. The damping or resonance frequency is determined by a suitable choice of the oscillating mass - in particular by the choice of the bore diameter and the number of bores 15th - as well as the spring properties - in particular through the volume and shape of the cavity 14th - on the ones in the canal 12th The vibration frequencies that occur are adapted to achieve optimized sound absorption.

In the case of the 6th shown air supply line 60 are compared to the air supply line 50 of the 5 instead of the access holes 15th Access holes 16 provided which the cavity 14th with the channel 13th connect. As a result, a spring-mass system is formed, which in the channel 13th occurring air vibrations dampen. In this case, those apply in connection with the damping of the air vibrations in the duct 12th statements made accordingly.

The 7th shows an embodiment of an air supply line 70 , in which the wall 11 both access holes 15th showing the cavity 14th with the channel 12th connect, as well as access holes 16 having, which the cavity 14th with the channel 13th connect. As a result, two spring-mass systems are formed, with the air volume of the cavity 14th forms the spring of both spring-mass systems. Together with the access openings 15th the result is a spring-mass system, which is in the channel 12th occurring air vibrations dampen. Along with the access openings 16 forms the cavity 14th a spring-mass system, which is in the channel 13th occurring air vibrations dampen. The spring-mass systems can be adapted to frequencies occurring in the respective channel in order to dampen these frequencies. Because the through the cavity 14th The spring formed is the same for both systems, the adjustment is based on the moving mass. In the embodiment shown, they have the access openings 15th , 16 forming holes on the same diameter, so that the adjustment of the vibrating mass is done by choosing the number of holes. The mass of the vibration in the channel 12th The damping spring-mass system is then the mass of the air volume, which results from the multiplication of the wall thickness of the wall 11 at the access openings 15th with the cross-sectional area of one of the access openings determined by the bore diameter 15th and the number of access openings 15th results. The mass of the vibration in the channel 13th damping spring-mass-system is the mass of the air volume, which results from the multiplication of the wall thickness of the wall 11 at the access openings 16 with the cross-sectional area of one of the access openings determined by the bore diameter 16 and the number of access openings 16 results. In this way one is attached to each channel 12th , 13th adapted sound absorption enables.

The 8th shows a sectional view along the section line VIII-VIII of the air supply line 70 according to the 7th . Like in the 8th can be seen, has the air supply line 70 several partitions along its length 17th on so that in the wall 11 multiple cavities 14th are formed. The cavities 14th differ in their dimensioning and in the number of access openings 16 showing the respective cavity 14th with the channel 13th connect. This results in different spring-mass systems, each of which is used to dampen air vibrations in the duct 13th contribute. The damping properties, in particular the resonance frequency, of each spring-mass system are determined by the selection of the dimensions of the corresponding cavity 14th as well as the cross-section and the number of access openings 16 to those in the canal 13th Adjusted to any air vibrations occurring in order to achieve the best possible damping. The same applies to the (in the 8th not shown) connection of the cavities with the channel 12th by means of access openings 15th and the attenuation that can be adjusted as a result of this in the channel 12th occurring air vibrations. Depending on the different or similar vibration properties of the channels 12th , 13th Here, different or the same damping properties of the corresponding spring-mass systems can be selected.

In the embodiment of 7th and 8th all have access openings 15th , 16 the same cross-section. In alternative configurations, the access openings 15th , 16 have different cross-sections. In particular, all cross-sections of access openings 15th , 16 to a cavity 14th have the same cross-section, this representing a cavity 14th constant cross-section between different cavities 14th differs.

The designs in connection with the configuration of several cavities 14th according to the 8th apply accordingly to other configurations of the air supply line. In particular, all cavities can in embodiments 14th be connected to only one channel via appropriate access openings. In alternative configurations, individual cavities 14th with the one channel 12th , the other channel 13th or both channels can be connected via corresponding access holes. Any combinations are possible here. In this way, the sound attenuation in the air supply line is based on specific configurations of the ducts 12th , 13th adaptable, especially to different ones in the channels 12th , 13th Occurring vibration frequencies and / or different places where the vibrations arise.

The 9 shows another air supply line 90 in a perspective sectional view. In the 9 can be seen as the access openings 16 the cavities 14th with the channel 13th connect. Here is only one half of the air supply line 90 shown in the longitudinal direction. The other half with the canal 12th is not shown. The channel can also be in various designs 12th via access holes 15th with the cavities 14th be connected. In further refinements, each of the channels is 12th , 13th only with part of the cavities 14th connected, with respect to different cavities 14th one, both or neither of the channels 12th , 13th can be connected to a respective cavity. Cavities 14th that with none of the channels 12th , 13th are connected, do not contribute to sound attenuation in the air supply line 90 at. It can still be useful to have such cavities 14th to be provided, for example to save weight while maintaining the stability of the air supply line 90 .

The 10 shows an embodiment of an air supply line 100 at which the cavity 14th with a damping material 18th is filled. The damping material influences the spring properties of the volume of the cavity 14th in each in connection with the access openings 15th , 16 formed spring-mass systems. In this way, the spring-mass system can be further applied to the channels 12th , 13th Adjust the air vibrations that occur, in particular set the respective damping frequency. In versions with several Cavities 14th can be a cavity 14th , multiple cavities 14th or all voids 14th with a damping material 18th be filled. The cavities 14th can with different damping materials 18th be filled. As damping materials 18th In particular, elastic materials or material combinations such as natural or synthetic rubbers, other elastomers, mineral or steel wool, fiber materials such as wood or textile and combinations thereof come into consideration. The choice of voids to be filled 14th and the damping materials used are dependent on the desired damping properties, in particular on the required spring properties of the respective cavities 14th .

In the case of the 11 shown execution of an air supply line 110 shows the separating wall 11 several cavities, each with an access hole of the same cross-section to a blind hole or blind hole 19th are connected. In this way is the channel 12th with several blind holes 19th , so cavity-through hole combinations, connected, creating a damping effect of air vibrations in the channel 12th is achieved. Depending on the production method, the blind holes 19th have a drill cone (not shown) at its end, an embodiment without a drill cone being achievable, for example, by plunge milling.

The one in the 12th shown air supply line 120 differs from the air supply line 110 to 11 , in that in the air supply line 120 the channel 13th with several blind holes 19th is in connection and thereby a damping effect with respect to the channel 13th resulting air vibrations is reached.

The 13th shows an air supply line 130 which one wall 11 with blind holes 19th having a part of which with the channel 12th and another part with the canal 13th is in connection, so that a damping effect both in terms of the channel 12th as well as regarding the channel 13th is reached.

In the 14th is another version of an air supply line 140 shown. The wall 11 the air supply line 140 has a cavity in a lower area 14th and access holes 15th , 16 on, by means of which a respective spring-mass system for damping vibrations of the air in the ducts 12th , 13th is trained. The wall is in an upper section 11 as a solid wall without a cavity 14th educated. Here, the cross section of the wall in the upper section is smaller than the total cross section of the wall 11 in the lower section with the cavity 14th . In alternative configurations, the cross-sectional ratios of the sections of the wall 11 be reversed or the wall 11 have a uniform (overall) cross-section.

In the case of the 15th shown air supply line 150 are the upper and lower sections of the wall 11 compared to the design of the 14th swapped so that the upper section of the wall 11 the air supply line 150 a cavity 14th has, while the lower portion of the wall 11 is made massive. Furthermore, the wall is 11 the air supply line 150 provided as a separate component, which at its points of contact 10 with the upper half-shell 5 and the lower half-shell 4th is welded.

The 16 shows an air supply line 160 where the wall 11 in a lower section with a cavity 14th and access holes 15th , 16 to the canals 12th , 13th is trained. In an upper section of the wall 11 points this to a respective blind hole 19th connected cavities and access holes each having an identical cross section. Here are the blind holes 19th partly with the canal 12th , partly with the canal 13th connected so that a damping effect through blind holes 19th in both channels 12th , 13th is reached. The blind holes 19th have different depths, so that different spring-mass systems with different damping properties are implemented here. In alternative configurations, the diameters of the blind holes can differ or in addition 19th be varied.

The one in the 17th pressure supply line shown 170 differs from that in the 16 pressure supply line shown 160 in that the wall 11 the pressure supply line 170 in an upper section one by means of access holes 15th , 16 with the channels 12th , 13th connected cavity 14th and blind holes in a lower portion 19th having. Furthermore, the wall is 11 the pressure supply line 170 than from the half-shells 4th , 5 executed as a separate component, which with the half-shells 4th , 5 at points of contact 10 its bottom and top is welded.

In the 18th is an alternative embodiment of a pressure supply line 180 shown. In the pressure supply line 180 assign the channels 12th and 13th different cross-sections. In alternative configurations, the cross-sections of the channels 12th , 13th designed differently and variable along the course of the pressure supply line. Different cross-sections of the channels, in particular adapted to the ambient conditions of the air supply line 12th , 13th are also in variations of the configurations according to FIGS 5 to 17th possible.

The 19th shows a pressure supply line 190 which another wall 11 having. This is between the channels 12th , 13th another channel 20th created so that the pressure supply line three is from the pressure side 2 to the suction side 3 having extending channels. Both walls 11 include a respective cavity 14th . Here is one of the cavities 14th via access holes 15th in connection with the channel 12th . The other cavity 14th stands over access holes 16 in connection with the channel 13th . About access holes 21 are both cavities 14th with the channel 20th connected. In this way there is a damping of air vibrations in all channels 12th , 13th , 20th provided. For alternative configurations of air supply lines with two walls 11 and three channels 12th , 13th , 20th The statements relating to air supply lines with one wall apply 11 corresponding. In particular, the walls 11 can be varied independently of one another in alternative configurations.

In general, in order to create embodiments of a pressure supply line according to the invention, features according to the statements relating to FIGS 5 to 19th be combined. In particular, a wall 11 be configured differently along the course of the pressure supply line in several sections, for example with regard to the configuration of cavities 14th and access holes 15th , 16 , 21 . A wall 11 in particular also in the longitudinal direction sections without cavities 14th or access holes 15th , 16 , 21 exhibit. Walls 11 can (at least partially) as separate components or (at least partially) as a molding of the lower half-shell 4th and / or the upper half-shell 5 be trained. Furthermore, configurations with additional channels are possible.

The features disclosed in the above description, in the figures and in the claims can be important individually as well as in their combination for the implementation of the invention in the various configurations.

List of reference symbols

1, 30, 40, 50, 60, 70, 90, 100, 110, 120, 130, 140, 150, 160, 170, 180, 190

Air supply line

2

Print side

3

Suction side

4th

lower half-shell

5

upper half-shell

6th

Shaping

7th

cavity

8, 10

Point of contact

9

deepening

11

Wall

12, 13, 20

channel

14th

cavity

15, 16, 21

Access opening

17th

partition wall

18th

Damping material

19th

Blind hole / blind hole

QUOTES INCLUDED IN THE DESCRIPTION

This list of the documents listed by the applicant was generated automatically and is included solely for the better information of the reader. The list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions.

Patent literature cited

• DE 102007039292 A1 [0004]
• IN 201000873 I3 [0007]
• CN 2433392 Y [0008]

Claims (24)

Air supply line for coupling to an air consumer in a motor vehicle, preferably a drive of the motor vehicle, such as an internal combustion engine or a fuel cell - Two channels (12, 13) extending from a pressure side (2) to a suction side (3) of the air supply line facing the air consumer; and - A wall (11) separating the two channels (12, 13) and having at least one cavity (14); wherein the separating wall (11) has at least one access hole (15, 16) between at least one of the two channels (12, 13) and the at least one cavity (14). Air supply line to Claim 1 , wherein the two channels (12, 13) are set up to guide air that is subjected to an increased pressure compared to an ambient pressure. Air supply line according to at least one of the preceding claims, wherein the separating wall (11) is a stiffening structure. Air supply line according to at least one of the preceding claims, wherein the wall (11) has at least one further access hole (15, 16) between the other of the two channels (12, 13) and the at least one cavity (14) of the separating wall (11). Air supply line according to at least one of the preceding claims, wherein the separating wall (11) has at least two cavities (14). Air supply line to Claim 5 , the two cavities (14) of the separating wall (11) being arranged one behind the other along the course of the air supply line from the pressure side (2) to the suction side (3) and being separated from one another by a cavity partition (17). Air supply line to at least one of the Claims 5 and 6th wherein the separating wall (11) has at least one access hole (15, 16) between one of the two cavities (14) and one of the two channels (12, 13) and / or the other of the two channels (12, 13) ; and - between the other of the two cavities (14) and the one of the two channels (12, 13) and / or the other of the two channels (12, 13) each has at least one access hole (15, 16). Air supply line according to at least one of the preceding claims, wherein the at least one access hole (15, 16) has a round cross section with a diameter of at least 1 mm to a maximum of 10 mm, preferably from at least 2 mm to a maximum of 5 mm, more preferably from at least 3 mm to maximum 3.5 mm. Air supply line according to at least one of the preceding claims, wherein the at least one access hole (15, 16) is a bore. Air supply line according to at least one of the preceding claims, wherein a minimum wall thickness between the at least one cavity (14) and at least one of the two channels (12, 13) at least 1 mm to a maximum of 10 mm, preferably at least 2.5 mm to a maximum of 6 mm, further preferably at least 3 mm to a maximum of 4 mm. Air supply line according to at least one of the preceding claims, wherein the at least one cavity (14, 19) and the at least one access hole (15, 16, 19) between the one of the two channels (12, 14) and the at least one cavity (14) are the same Have cross-section. Air supply line according to at least one of the preceding claims, wherein the at least one cavity (14) and / or the at least one access hole (15, 16) are filled with a damping material (18). Air supply line according to at least one of the preceding claims, wherein the air supply line is rigid. Air supply line according to at least one of the preceding claims, wherein the air supply line consists of a plastic, preferably a thermoplastic such as polyamide, for example polyamide with a glass fiber reinforcement. Air supply line according to at least one of the preceding claims, wherein the air supply line has an upper half-shell (5) and a lower half-shell (4) which are connected to one another to form the air supply line. Air supply line to Claim 15 , the upper half-shell (5) and the lower half-shell (4) being welded to one another. Air supply line to at least one of the Claims 15 and 16 , wherein the separating wall (11) is formed with a shape of the upper half-shell (5) and / or the lower half-shell (4). Air supply line according to at least one of the preceding claims, wherein the air supply line has a flattened cross section. Arrangement for supplying air for an air consumer of a motor vehicle, with - an air supply device, such as a compressor or a suction device; - In particular an air supply line designed according to at least one of the preceding claims; and - an air consumer, preferably a drive of the motor vehicle, such as an internal combustion engine or a fuel cell; wherein - the air supply line is connected to the air supply device in such a way that air from the air supply device can enter the two channels (12, 13) of the air supply line; and - the air supply line is connected to the air consumer in such a way that air can exit from the two channels (12, 13) of the air supply line and enter the air consumer. Arrangement according to Claim 19 , wherein the air supply device is a ventilation opening. Arrangement according to Claim 19 , wherein the air supply device is a compressor, preferably a turbocharger or compressor. Use one after one of the Claims 1 to 18th formed air supply line, with air being supplied to an air consumer, preferably a drive, such as an internal combustion engine or a fuel cell, of a motor vehicle from the pressure side (2) to the suction side (3) of the air supply line through the two channels (12, 13). Use after Claim 22 , wherein the air supplied to the air consumer of a motor vehicle is subjected to a pressure which is higher than that of an ambient pressure. Use after at least one of the Claims 22 and 23 , the air being supplied to the air consumer by a compressor, preferably a turbocharger or compressor.

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