Line system for a motor vehicle and internal combustion engine for a motor vehicle

Abstract

The invention relates to a line assembly (34) for a motor vehicle, comprising a line element (32) through which a fluid flows, which has a corrugated bellows (36) in at least one length (L2), wherein a damping device (38) arranged outside the line element (32) is connected to the line element (32) at a first connection point (V1) arranged upstream of the corrugated bellows (36) and at a second connection point (V2) arranged downstream of the corrugated bellows (36), which is connected in parallel to the corrugated bellows (36) arranged outside the damping device (38) and has two damping elements (40, 42) arranged at least partially one inside the other, which are movable relative to each other in the longitudinal direction of the line element (32) and rub against each other during relative movements between the damping elements (40, 42) in the longitudinal direction of the line element (32).which is to dampen vibrations of the bellows (36).

Description

[0001] The invention relates to a line device for a motor vehicle, in particular for an internal combustion engine of a motor vehicle, according to the preamble of patent claim 1. Furthermore, the invention relates to an internal combustion engine for a motor vehicle.

[0002] DE 10 2007 058 067 B4 describes a turbocharging system for an engine, comprising a pair of exhaust manifolds mounted on cylinder heads on both sides of the engine. Also provided is a pair of turbochargers connected to the pair of exhaust manifolds, which increase the intake air flow using energy from the exhaust gas.

[0003] DE 10 2016 123 975 A1 discloses a line device for a motor vehicle, comprising a line element through which a fluid can flow, which has a corrugated bellows in at least one longitudinal region, and a damping device arranged outside the line element, connected to the line element at a first connection point arranged upstream of the corrugated bellows and at a second connection point arranged downstream of the corrugated bellows, which is connected parallel to the corrugated bellows arranged outside the damping device. The damping device has two damping elements arranged at least partially within one another, which are movable relative to one another in the longitudinal direction of the line element and rub against one another during relative movements occurring between the damping elements in the longitudinal direction of the line element, thereby damping vibrations of the corrugated bellows.A first inner damping element is at least partially arranged within a second outer damping element. The outer damping element has a first chamber, which is delimited by a first base of the outer damping element in a first delimiting direction extending in the longitudinal direction of the line element and pointing away from the inner damping element, and is delimited by a first side wall of the outer damping element in the circumferential direction of the first chamber extending around the first delimiting direction. The inner damping element is at least partially arranged in the first chamber.

[0004] The object of the present invention is to provide a line device for a motor vehicle and an internal combustion engine for a motor vehicle, so that the vibrations of the bellows can be damped effectively and efficiently.

[0005] This object is achieved by a conduit device having the features of patent claim 1 and by an internal combustion engine having the features of patent claim 7. Advantageous embodiments with expedient further developments of the invention are specified in the remaining claims.

[0006] A first aspect of the invention relates to a conduit device for a motor vehicle, also referred to simply as a vehicle, in particular for an internal combustion engine of a motor vehicle. The conduit device comprises a conduit element through which a fluid can flow, which has a corrugated bellows, also referred to as a bellows, in at least one longitudinal region of the conduit element. The conduit element, and thus the corrugated bellows, is formed, for example, from a plastic or a metallic material.As is well known from the general prior art, the corrugated bellows is an accordion-like extending, in particular accordion-folded, region which, in particular in the longitudinal direction of the line element and thus of the corrugated bellows, can be pulled apart, increasing the length of the line element, and compressed, shortening the length of the line element, in a non-destructive manner and thus without causing damage to the line element. This can, for example, compensate for a temperature- and movement-related change in the length of the line element and / or positional tolerances. The line element and thus the corrugated bellows extend elongated in the longitudinal direction of the line element. In particular, the fluid can flow through the line element and thus the corrugated bellows along or in a flow direction.This means, in particular, that when the motor vehicle is in operation, the fluid flows in the direction of flow through the line element and thus through the bellows. The flow direction either coincides with the longitudinal direction of the line element, or the flow direction runs parallel to the longitudinal direction of the line element and thus of the bellows.

[0007] If, for example, two components are fluidically connected to one another via the line element, so that the fluid can be guided via the line element from one of the components to the other of the components and / or vice versa, the corrugated bellows (bellows) can, for example, compensate for relative movements between the components, so that the bellows, for example, allows length regions of the line element, with the bellows (corrugated bellows) being arranged between the length regions, to move relative to one another and to carry out the relative movements.

[0008] The conduit device has a damping device arranged outside the conduit element and thus outside the corrugated bellows, wherein the corrugated bellows is arranged outside the damping device. The damping device is connected to the conduit element at a first connection point and a second connection point, and is thus connected to the conduit element. The first connection point is arranged upstream of the corrugated bellows in the flow direction of the fluid flowing through the conduit element, and the second connection point is arranged downstream of the corrugated bellows in the flow direction of the fluid flowing through the conduit element and thus downstream of the first connection point, and is in particular spaced from the first connection point. Because the damping device is connected to the conduit element at the connection points, the damping device is held on the conduit element at the connection points.In particular, it is provided that a first of the aforementioned lengths of the conduit element has the first connection point and a second of the aforementioned lengths of the conduit element has the second connection point, wherein the corrugated bellows is arranged, in particular in the flow direction of the fluid flowing through the conduit element, between the first length of the conduit element and the second length of the conduit element. Thus, the damping device arranged outside the corrugated bellows is connected in parallel to the corrugated bellows, which is arranged outside the damping device.

[0009] The damping device has two damping elements which are at least partially arranged one inside the other and which are movable relative to one another, in particular translationally, in the longitudinal direction of the line element and which rub against one another, in particular directly, during relative movements between the damping elements occurring in the longitudinal direction of the line element, whereby vibrations occurring at least in the longitudinal direction of the line element and thus movements of the bellows are to be damped.In particular, the damping elements are arranged telescopically or telescopically within one another, so that the damping elements can move relative to one another, in particular translationally, along the longitudinal direction of extension, i.e., along a direction of movement that coincides with the longitudinal direction of extension of the line element or runs parallel to the longitudinal direction of extension of the line element, in particular while the damping elements are and remain at least partially arranged within one another. During the relative movements between the damping elements along the direction of movement, the damping elements rub directly against one another. This means that when the damping elements move relative to one another along the direction of movement, friction arises between the damping elements. This friction dampens the aforementioned vibrations of the corrugated bellows.The damping device with the damping elements thus functions as a shock absorber or in the manner of a shock absorber, by means of which vibrations of the corrugated bellows occurring, in particular, at least along the longitudinal direction of the line element can be damped. Preferably, the respective damping element, i.e., a first of the damping elements and a second of the damping elements, is designed as a respective solid body and preferably inherently rigid, i.e., dimensionally stable, whereby vibrations of the corrugated bellows can be damped. The relative movements between the damping elements occurring along the direction of movement, i.e., in the longitudinal direction of the line element, arise, for example, from relative movements between the longitudinal regions of the line element, in particular, in the longitudinal direction of the line element.Such relative movements, particularly in the longitudinal direction of the line element, between the longitudinal regions of the line element lead, for example, to relative movements, particularly in the longitudinal direction of the line element, between respective regions of the corrugated bellows, for example, a metallic bellows (i.e., a bellows made of a metallic material). Since the damping device is coupled to the line element at the connection points, the aforementioned relative movements, particularly in the longitudinal direction of the line element, between the longitudinal regions of the line element and thus between the regions of the corrugated bellows, lead to the described relative movements, particularly in the direction of movement, between the damping elements and, in particular, translational relative movements.Since this results in friction between the damping elements, the relative movements between the damping elements and, consequently, the relative movements between the longitudinal regions of the line element and thus the relative movements between the regions of the corrugated bellows are damped, whereby vibrations of the corrugated bellows can be damped. Since the damping device is arranged outside the line element and thus outside the corrugated bellows, and since the line element and thus the corrugated bellows are arranged outside the damping device, wherein it is provided in particular that the damping elements are spaced, in particular completely, from the corrugated bellows, undesirable friction between the corrugated bellows and the respective damping element can be avoided, so that excessive wear of the line device can be avoided.Furthermore, contact corrosion between the bellows and the respective damping element can be prevented, thus preventing excessive wear on the line system. Furthermore, excessive vibrations of the bellows can be avoided, thus also preventing excessive wear on the line element or line system. As a result, it is possible to design the line element, especially the bellows, with particularly thin walls, thus keeping the weight and space requirements of the line system to a particularly low level.

[0010] The feature that the damping device is arranged outside the line element and the line element is arranged outside the damping device means that the damping device is arranged outside the bellows and the bellows is arranged outside the damping device. Since the first connection point is arranged upstream of the bellows and the second connection point is arranged downstream of the bellows, the damping device and the bellows are connected in parallel, for example, like two springs connected in parallel, so that damping can be achieved for the preferably metallic bellows by means of the damping device, in particular such that relative movements between the longitudinal regions of the line element and thus relative movements between said regions of the bellows can be damped by means of the damping device.

[0011] Metallic casings for corrugated bellows are well known. Traditionally, the bellows is thus arranged in a metallic casing, which is formed, for example, as a metallic wire mesh, so that the metallic casing encloses and surrounds the bellows. While this can provide damping for the bellows, it can lead to direct friction between the metallic casing and the bellows, as well as contact corrosion between the metallic casing and the bellows, particularly under high vibration loads. As a result, the bellows can be damaged, for example, breaking or tearing.

[0012] Friction between the bellows and the damping device, as well as contact corrosion between the bellows and the damping device, can be avoided, thus preventing wear of the bellows caused by the damping device. Furthermore, the damping device can be used to dampen the bellows, in particular by damping relative movements between the different sections of the bellows.

[0013] In order to be able to dampen vibrations of the bellows, it is provided that a first inner one of the damping elements is arranged at least partially in a second outer one of the damping elements.

[0014] To dampen the vibration of the corrugated bellows, the outer conduit element has a first chamber which is delimited, in particular directly, by a first base of the first outer damping element in a first delimiting direction running in the longitudinal direction of the conduit element and pointing away from the inner damping element, which, for example, coincides with the direction of movement or runs parallel to the direction of movement. The first chamber is delimited, in particular completely circumferentially, by a first side wall of the outer damping element and is thereby delimited, in particular directly, in the circumferential direction of the first chamber running around the first delimiting direction and thus around the direction of movement. The inner damping element is arranged at least partially in the first chamber.Thus, for example, a volume of a medium, preferably in the form of a gas, can be accommodated in the first chamber, with the medium preferably being air. The medium accommodated in the first chamber can be compressed and / or conveyed, for example, by the relative movement between damping elements running along the direction of movement and preferably translationally. It is conceivable, for example, to throttle a flow of the medium resulting from the conveyance of the medium. This allows the relative movements between the damping elements and thus the vibration of the bellows to be damped particularly effectively.

[0015] In order to effectively and efficiently dampen the vibrations of the corrugated bellows, the invention provides that the inner damping element has a second chamber which is delimited, in particular directly, by a second base of the inner damping element in a second delimiting direction running in the longitudinal direction of the line element, pointing away from the first base and opposite the first delimiting direction, which second delimiting direction, for example, coincides with the direction of movement or runs parallel to the direction of movement. In the circumferential direction of the second chamber running around the second delimiting direction and thus around the first delimiting direction, the circumferential direction of which coincides with the circumferential direction of the first chamber, the second chamber is delimited, in particular completely circumferentially, by a second side wall of the outer damping element and is thus delimited, in particular directly.The second chamber is fluidically connected to the first chamber. Thus, for example, the aforementioned medium can also be accommodated in the second chamber and / or flow back and forth between the chambers, particularly during relative movements between the damping elements. The damping device can thus act in the manner of a hydraulic or pneumatic shock absorber, in particular, whereby the vibrations of the bellows can be effectively and efficiently damped, in particular without contact corrosion between the bellows and the damping device and without direct friction between the bellows and the damping device occurring. This can advantageously prevent excessive wear of the line device.

[0016] In order to be able to dampen the relative movements between damping elements and consequently the vibrations of the bellows particularly advantageously, it is provided in an embodiment of the invention that the first chamber is cylindrical on the inner circumference, thus having the shape of a right circular cylinder.

[0017] A further embodiment is characterized in that the inner damping element is cylindrical on the outer circumference at least in a length region of the inner damping element accommodated in the first chamber, thus having the shape of a right circular element, whereby the relative movements between the damping elements and thus the vibrations of the bellows can be damped particularly advantageously.

[0018] A further embodiment is characterized in that the second chamber is open toward the first base and thus in the first boundary direction, and is thus fluidly connected to the first chamber. This allows the relative movements between the damping elements and thus the vibrations of the bellows to be damped particularly advantageously, thus reliably preventing excessive wear on the conduit system.

[0019] Advantageously, the second chamber is cylindrical on its inner circumference, meaning that the second chamber preferably has the shape of a right circular cylinder on its inner circumference. This allows for particularly advantageous damping of the vibration of the corrugated bellows, reliably preventing excessive wear on the piping system.

[0020] In order to advantageously dampen the relative movements between the damping elements and thus between the regions of the bellows, and thus advantageously prevent excessive wear, a further embodiment of the invention provides for the damping elements to be made of a plastic. For example, the first damping element is made of a first plastic, and the second damping element is made of a second plastic. The first plastic and the second plastic can be the same plastic, or the second plastic can be different from the first plastic. This allows advantageous damping to be achieved.

[0021] It has proven particularly advantageous if the conduit element is designed as an exhaust line through which the fluid can flow as an exhaust gas from an internal combustion engine, also referred to as an internal combustion engine or combustion motor. In other words, the fluid is preferably the exhaust gas from the internal combustion engine.

[0022] Finally, it has proven particularly advantageous if the line element is designed as a liquid line through which the fluid in the form of oil or at least comprising water can flow.

[0023] A second aspect of the invention relates to an internal combustion engine for a motor vehicle, also simply referred to as a vehicle, and preferably designed as a motor vehicle, in particular as a passenger car. This means that the motor vehicle, in its fully manufactured state, has the internal combustion engine and can be driven by the internal combustion engine. The internal combustion engine has at least one line device according to the first aspect of the invention. Advantages and advantageous embodiments of the first aspect of the invention are to be regarded as advantages and advantageous embodiments of the second aspect of the invention, and vice versa.

[0024] The internal combustion engine has, for example, an exhaust gas turbocharger which has a turbine and a compressor. The turbine can be driven by exhaust gas from the internal combustion engine, which provides its exhaust gas during fired operation of the internal combustion engine. The compressor can be driven by the turbine, whereby air can be compressed by means of the compressor, which air can be introduced into at least one combustion chamber of the internal combustion engine. The line device is preferably used to supply the exhaust gas turbocharger with the fluid and / or to discharge the fluid from the exhaust gas turbocharger. If the fluid is, for example, an oil, the line element through which the oil can flow is used, for example, to supply the exhaust gas turbocharger with the oil and / or to discharge the oil from the exhaust gas turbocharger.For example, at least one lubrication point of the exhaust gas turbocharger is supplied with oil, whereby the exhaust gas turbocharger can be lubricated and / or cooled at the lubrication point by means of the oil. If the fluid is, for example, a cooling liquid comprising at least water, the line element is used, for example, to supply the exhaust gas turbocharger with the cooling liquid and / or to discharge the cooling liquid from the exhaust gas turbocharger. For example, at least a partial area of ​​the exhaust gas turbocharger is cooled by means of the cooling liquid. If, for example, the fluid is the exhaust gas of the internal combustion engine, the line element is used, for example, to convey the exhaust gas to the exhaust gas turbocharger, in particular to the turbine, and / or to discharge the exhaust gas from the exhaust gas turbocharger, in particular from the turbine.

[0025] In order to be able to achieve a particularly high level of robustness, it is preferably provided that the line element and thus the corrugated bellows are formed from a metallic material, in particular from a light metal or a light metal alloy or from a steel.

[0026] Further advantages, features, and details of the invention will become apparent from the following description of a preferred embodiment and from the drawings. The features and combinations of features mentioned above in the description, as well as the features and combinations of features mentioned below in the description of the figures and / or shown alone in the figures, can be used not only in the respective specified combinations, but also in other combinations or on their own, without departing from the scope of the invention.

[0027] The drawing shows: Fig. 1 is a schematic representation of an internal combustion engine for a motor vehicle; and Fig. 2 a schematic sectional view of a piping device of the internal combustion engine.

[0028] In the figures, identical or functionally identical elements are provided with the same reference symbols.

[0029] Fig. 1 shows a schematic representation of an internal combustion engine 10, also referred to as an internal combustion engine or combustion engine, for a motor vehicle, also simply referred to as a vehicle, which, in its fully manufactured state, has the internal combustion engine 10 and can be driven by the internal combustion engine 10. The internal combustion engine 10 is designed as a reciprocating piston engine, thus as a reciprocating piston machine. The internal combustion engine 10 has an engine block 12, which has cylinders 14. Each cylinder 14 partially defines a respective combustion chamber of the internal combustion engine 10. During fired operation of the internal combustion engine 10, combustion processes take place in the respective combustion chamber. During the respective combination process, a fuel-air mixture, also simply referred to as a mixture, is combusted, resulting in exhaust gas from the internal combustion engine 10.The respective mixture comprises at least air and, for example, a liquid fuel.

[0030] The internal combustion engine 10 has an intake tract 16, also referred to as the intake stroke, through which the aforementioned air can flow, as indicated by an arrow 18. The intake tract 16 can be used to introduce the air into the respective combustion chamber. The internal combustion engine 10 also has an exhaust tract 20, through which the exhaust gas from the respective combustion chamber can flow, as indicated by an arrow 22. Thus, the exhaust gas can be removed from the respective combustion chamber via the exhaust tract 20.

[0031] The internal combustion engine 10 has an exhaust gas turbocharger 24, which has a compressor 26 arranged in the intake tract 16 and a turbine 28 arranged in the exhaust tract 20. The turbine 28 can be driven by the exhaust gas. The compressor 26 can be driven by the turbine 28, in particular via a shaft 30 of the exhaust gas turbocharger 24. By driving the compressor 26, the air flowing through the intake tract 16 can be compressed by means of the compressor 26. In the exemplary embodiment shown in the figures, at least a length region L1 of the exhaust tract 20 is Fig. 2, through which the exhaust gas can flow and is therefore also referred to as a pipe or exhaust pipe. The pipe element 32 is a component of a pipe device 34 of the internal combustion engine 10. The exhaust gas of the internal combustion engine 10 is thus a fluid, and the fluid can flow through the pipe element 32.

[0032] Out of Fig. 2 shows that the line element 32 has, at least in a length region L2 of the line element 32, a corrugated bellows 36, which is also referred to as a corrugated bellows or a convoluted bellows. The aforementioned fluid can flow through the line element 32 and thus the corrugated bellows 36. In the exemplary embodiment shown in the figures, the fluid is the exhaust gas from the respective combustion chamber of the internal combustion engine 10. For example, the line element 32 and thus the corrugated bellows 36 are formed from a metallic material, which allows for a particularly high degree of robustness of the line element 32.

[0033] In order to prevent excessive wear of the line device 34, the line device 34 has a damping device 38 arranged outside the line element 32 and thus outside the bellows 36, which is connected in parallel to the bellows 36. The feature that the damping device 38 is connected in parallel to the bellows 36 is to be understood that the bellows 36 and the damping device 38 are connected in parallel to each other like two springs connected in parallel. In addition, Fig. 2 that the bellows 36 is arranged outside the damping device 38.

[0034] The damping device 38 is connected to the line element 32 at a first connection point V1 and at a second connection point V2, thus being connected to the line element 32. The arrow 22 illustrates a flow of the exhaust gas through the line element 32, so that the arrow 22 illustrates a flow direction in which the exhaust gas flows through the line element 32 and thus through the bellows 36 during operation of the internal combustion engine 10. In the flow direction of the exhaust gas flowing through the line element 32 and thus the bellows 36, the connection points V1 and V2 are arranged at a distance from one another and from the bellows 36.In the flow direction of the exhaust gas flowing through the line element 32, the connection point V1 is arranged upstream of the corrugated bellows 36 and upstream of the connection point V2, and in the flow direction of the exhaust gas flowing through the line element 32, the connection point V2 is arranged downstream of the corrugated bellows 36 and thus downstream of the connection point V1. By connecting the damping device 38 to the line element 32, the damping device 38 is connected in parallel to the corrugated bellows 36, thus the corrugated bellows 36 and the damping device 38 are connected in parallel to one another. In other words, the damping device 38 is connected in parallel to the corrugated bellows 36 in that the damping device 38 is connected to the line element 32 at the connection points V1 and V2 and that the connection point V1 is arranged upstream of the corrugated bellows 36 and the connection point V2 is arranged downstream of the corrugated bellows 36.

[0035] Out of Fig. 2 that the line element 32 has a second longitudinal region L3 and a third longitudinal region L4, wherein the longitudinal region L2 of the line element 32 and thus the corrugated bellows 36 are arranged between the longitudinal regions L3 and L4 of the line element 32 in the flow direction of the exhaust gas flowing through the line element 32. The longitudinal region L3, which is arranged or runs upstream of the corrugated bellows 36, has the connection point V1, and the longitudinal region L4, which is arranged or runs downstream of the corrugated bellows 36, has the connection point V2. For example, the longitudinal region L4 is connected to the turbine 28, in particular to a turbine housing of the turbine 28, and for example, the longitudinal region L3 is connected to the engine block 12 or to an exhaust manifold connected to the engine block 12 and through which the exhaust gas can flow.The engine block 12 or the exhaust manifold and the turbine 28 are thus components that are fluidically connected to one another via the line element 32, so that, for example, the exhaust gas can be guided from the engine block 12 or the exhaust manifold to the turbine 28.

[0036] The damping device 38 has damping elements arranged at least partially inside one another, namely a first inner damping element 40 and a second outer damping element 42. The damping elements 40 and 42 are preferably designed as solid bodies and are inherently rigid, thus dimensionally stable. In particular, the damping elements 40 and 42 are arranged telescopically or telescopically inside one another. This means that the damping elements 40 and 42 are arranged along a straight line, thus along a straight and Fig. 2 are at least or exclusively translationally movable relative to one another, in particular displaceable relative to one another, in the direction of movement illustrated by a double arrow 44. The direction of movement runs in the longitudinal direction of the line element 32, through which the exhaust gas can flow along its longitudinal direction. This means that the direction of movement coincides with the longitudinal direction of the line element 32 or runs parallel to the longitudinal direction of the line element 32. During relative movements between the damping elements 40 and 42 in the longitudinal direction of the line element 32, i.e. along the direction of movement, the damping elements 40 and 42 rub against one another, in particular directly.In other words, if the damping elements 40 and 42 move in the longitudinal direction of the line element 32 and thus at least translationally relative to one another along the direction of movement, friction arises between the damping elements 40 and 42, in particular between an outer circumferential surface 46 of the damping element 40 and an inner circumferential surface 48 of the damping element 42. The friction between the outer surfaces 46 and 48 arises in particular because, during the aforementioned relative movements between the damping elements 40 and 42, the outer surfaces 46 and 48 rub directly against one another.Because the damping elements 40 and 42 rub against each other, in particular directly, during the relative movements between the damping elements 40 and 42 occurring along the direction of movement, that is to say because the aforementioned friction occurs between the lateral surfaces 46 and 48, vibrations of the corrugated bellows 36 occurring at least in the longitudinal direction of the line element 32 are to be damped.

[0037] The corrugated bellows 36 permits relative movements between the length regions L3 and L4, in particular those relative movements in which the length regions L4 and L3 move relative to one another, particularly translationally, in the longitudinal direction of the conduit element 32. Such relative movements between the length regions L3 and L4 lead to relative movements between subregions of the corrugated bellows 36 arranged successively, for example, in the flow direction of the exhaust gas flowing through the conduit element 32, the subregions of which are also referred to as regions.By means of the damping device 38, such relative movements between the regions of the corrugated bellows 36 can now be damped, since, for example, relative movements occurring in the longitudinal direction of the line element 32, and in particular translational relative movements between the length regions L3 and L4, whose relative movements lead to the relative movements between the regions of the corrugated bellows 36, lead to relative movements occurring along the direction of movement between the damping elements 40 and 42. As a result, the damping elements 40 and 42 rub against one another, whereby the relative movements between the damping elements 40 and 42 and, consequently, the relative movements between the length regions L3 and L4 and the relative movements between the regions of the corrugated bellows 36 are effectively damped. Thus, excessive wear of the corrugated bellows 36 can be avoided.In addition, since the damping device 38 is arranged outside the line element 32 and the line element 32 is arranged outside the damping device 38, direct friction between the line element 32 and the damping device 38 and contact corrosion between the line element 32 and the damping device 38 can be avoided, whereby excessive wear of the line device 34 can be avoided.

[0038] Out of Fig. 2 that the outer damping element 42 has a first chamber 50, which is delimited by a first base 52 of the outer damping element 42 in a first delimiting direction, illustrated by an arrow 53, running in the longitudinal direction of the line element and pointing away from the inner damping element 40. Furthermore, the first chamber 50 is delimited in the circumferential direction of the first chamber 50, in particular completely circumferentially, by a first side wall 54 of the outer damping element 42 and is thereby delimited, in particular directly. The inner damping element 40 is at least partially arranged in the first chamber 50. The first chamber 50 is preferably cylindrical on the inner circumference.Preferably, the inner damping element 40 is cylindrical on the outer circumference, at least in a length region L5 of the inner damping element 40 accommodated in the first chamber 50. From . Fig. 2 it can be seen that the preferably cylindrical chamber 50 is delimited, in particular directly, for example by the inner circumferential surface 48.

[0039] The inner damping element 40 has a second chamber 56, which is delimited, in particular directly, by a second bottom 60 of the inner damping element 40 in a second delimiting direction running in the longitudinal direction of the line element 32, pointing away from the first bottom 52, opposite the first delimiting direction, and illustrated by an arrow 58. Furthermore, the second chamber 56 is delimited, in particular completely circumferentially, by a second side wall 62 of the inner damping element 40 in the circumferential direction of the second chamber 56 running around the second delimiting direction and thus around the first delimiting direction, the circumferential direction of which coincides with the circumferential direction of the first chamber 50, and is thus delimited, in particular directly. The second chamber 56 is fluidically connected to the first chamber 50. The damping elements 40 and 42 are designed as solid bodies and are dimensionally stable, and therefore inherently rigid.

[0040] In the embodiment shown in the figures, the second chamber 56 is open towards the first bottom 52 and thus in the first boundary direction and is thus fluidly connected to the first chamber 50.

[0041] In the Fig. 2, the line device 34 has a holding device 64, which is formed, for example, separately from the damping device 38 and separately from the line element 32 and is connected to the line element 32 at the connection points V1 and V2, via which holding device 64 the damping device 38 held on the holding device 64 is connected to the line element 32. The holding device 64 has a first holding element 66 connected to the line element 32 at the first connection point V1, which is also referred to as a first holder and is connected to the damping element 42, in particular bypassing the damping element 40. The holding device 64 also has a second holding element 68 connected to the line element 32 at the second connection point V2, which is also referred to as a second holder and is connected to the damping element 40, in particular bypassing the damping element 42.The holding device 64, i.e. the holders, allows or permits the relative movements between the damping elements 40 and 42 along the direction of movement.

[0042] In the Fig.In the embodiment shown in Figure 2, the damping elements 40 and 42 are designed as tubes for vibration damping, so that the damping element 40 is an inner tube and the damping element 42 is an outer tube for vibration damping. Excessive vibrations of the corrugated bellows 36 can be avoided by the vibration damping. As previously described, the vibration damping occurs in that relative movements, particularly along the longitudinal direction of the line element 32, between the length regions L3 and L4, and thus relative movements, particularly along the longitudinal direction of the line element 32, between the regions of the corrugated bellows 36, lead to relative movements, along the direction of movement, between the damping elements 40 and 42, as a result of which the damping elements 40 and 42 rub against one another. As a result, the relative movements and thus the vibrations of the corrugated bellows 36 are damped.

Claims

[1] Conduit device (34) for a motor vehicle, comprising a conduit element (32) through which a fluid can flow, which has a corrugated bellows (36) in at least one length region (L2), and a damping device (38) arranged outside the conduit element (32) and connected to the conduit element (32) at a first connection point (V1) arranged upstream of the corrugated bellows (36) and at a second connection point (V2) arranged downstream of the corrugated bellows (36), which is connected parallel to the corrugated bellows (36) arranged outside the damping device (38) and has two damping elements (40, 42) arranged at least partially one inside the other, which are movable relative to one another in the longitudinal direction of the conduit element (32) and rub against one another during relative movements between the damping elements (40, 42) in the longitudinal direction of the conduit element (32),whereby vibrations of the corrugated bellows (36) are to be damped and a first inner one of the damping elements (40, 42) is arranged at least partially in a second outer one of the damping elements (40, 42), and the outer damping element (42) has a first chamber (50) which is delimited in a first delimiting direction (53) running in the longitudinal direction of the line element (32) and pointing away from the inner damping element (40) by a first bottom (52) of the outer damping element (42) and is delimited in the circumferential direction of the first chamber (50) running around the first delimiting direction (53) by a first side wall (54) of the outer damping element (42), and the inner damping element (40) is arranged at least partially in the first chamber (50), characterized by , that: - the inner damping element (40) has a second chamber (56) which is delimited by a second bottom (60) of the inner damping element (40) in a second delimiting direction (58) extending in the longitudinal direction of the line element (32), pointing away from the first bottom (52) and opposite the first delimiting direction (53), and is delimited by a second side wall (62) of the inner damping element (40) in the circumferential direction of the second chamber (56) extending around the second delimiting direction (58); and - the second chamber (56) is fluidly connected to the first chamber (50). [2] Conduit device (34) according to claim 1, characterized by that the first chamber (50) is cylindrical on the inner circumference. [3] Conduit device (34) according to claim 1 or 2, characterized bythat the inner damping element (40) is cylindrical on the outer circumference side at least in a length region (L5) of the inner damping element (40) accommodated in the first chamber (50). [4] Conduit device (34) according to claim 1, characterized by that the second chamber (56) is open towards the first bottom (52) and is thereby fluidly connected to the first chamber (50). [5] Conduit device (34) according to one of the preceding claims, characterized by that the line element (32) is designed as an exhaust line through which the fluid can flow as exhaust gas from an internal combustion engine (10). [6] Conduit device (34) according to one of claims 1 to 4, characterized by that the line element (32) is designed as a liquid line through which the fluid formed as oil or at least comprising water can flow. [7] Internal combustion engine (10) for a motor vehicle, with at least one line device (34) according to one of the preceding claims.

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