WO2019214937A1

WO2019214937A1 - Air pipe for motor vehicles

Info

Publication number: WO2019214937A1
Application number: PCT/EP2019/060362
Authority: WO
Inventors: Ralf Timme; Muralikrishna Sarangla; Alexander Benz; Viktor Benz; Holger Stoppert
Original assignee: Montaplast Gmbh
Priority date: 2018-05-09
Filing date: 2019-04-23
Publication date: 2019-11-14
Also published as: DE102018111192A1

Abstract

The invention relates to an air pipe for motor vehicles, wherein, at a first end (2) of the pipe (1), first connecting means (3) are provided for securing the pipe in an airtight manner to a first component (20) and, at the second end (4) of the pipe, second connecting means (5) are provided for securing the pipe in an airtight manner to a second component (25), wherein at least one flexible pipe portion (10) is provided between the first and the second connecting means (3, 5) of the pipe (1), wherein the flexible pipe portion (10) has a sequence of successively arranged regions of increased flexibility (11) and increased flexural strength (12), which regions are preferably composed of the same material and are formed integrally on one another. According to the invention, the regions of increased flexural strength (12) of the pipe have at least two circumferentially encircling ribs (14) and in each case a region which is arranged between two adjacent ribs (14) and has a smaller wall thickness than the ribs (14), wherein the wall of the flexible pipe portion (10) including the ribs (14) is composed of an elastic plastics material.

Description

Air line for motor vehicles

The invention relates to an air line for motor vehicles, in particular for connecting a hot component with a cold component, wherein at a first end of the line first connec tion medium for airtight fixing the line to a first component and at the second end of the line second Ver connecting means for airtight attachment the line are provided on a second component, wherein at least one flexible line section between the first and the second connec tion means of the line is provided, wherein the flexible line section comprises a succession of successively arranged areas of increased flexibility and increased bending stiffness, which preferably consist of the same material and integrally formed on each other.

Generic air ducts for motor vehicles are used in example to connect a turbocharger, a part of egg ner internal combustion engine or other Kraftzeuzeu geinrichtung with increased operating temperature with a cold component such as an air filter or a sons term air intake. Between the hot component and the cold component can thus be present at operating tempera ture of the motor vehicle readily a temperature difference of> 100 ° C. At the same time, the air line must provide tolerance and / or vibration compensation between the connection components. On the one hand, this relates to tolerances due to changing operating temperatures of the hot component, which also affects the connection region of the hot component to the air line. On the other hand, an air line is exposed to mechanical alternating stresses such as vibrations, vibrations, tensile and / or shear forces, which may also occur due to the operation of the vehicle. An air line must therefore withstand high thermal and / or mechanical loads over long periods of time.

Furthermore, an air line must be inexpensive to produce, especially in the production of motor vehicles in mass production, and easy to assemble and disassemble.

Previously known air ducts are often prepared as blow-molded parts, which are to be connected via separate metal clamps with the air supply and air discharge components such as turbo charger and air filter housing. However, the manufacture and handling of these separate connection means is expensive. Furthermore, by process lines produced by blow molding process due to un un average wall thickness, in particular when the line has a flexible portion in the manner of a bellows with wel lenlichen elevations and depressions. These un uniform wall thicknesses relate on the one hand to the various deflections of the Faltenbalgbereichs but also on the wall thicknesses of curved line areas, for example when the air duct in the manner of Luftansaug- is designed. However, the wall thickness of the air duct in these areas of curvature is difficult to control in the blow molding process.

On the other hand, such air ducts often have to withstand high suppression inside the duct, in particular when used as an air intake duct for turbochargers or the like, the cross-sectional geometry of the ducts Only in limited tolerances should change in order to ensure defi ned Luftansaugströmungsverhältnisse.

Furthermore, high demands are placed on the reliability of the air line over the longest possible service life, since, for example, damage to the line due to material fatigue can lead to a failure or loss of performance of the device supplied with the clean air, such as a turbocharger.

The invention is based on the object to provide an air line for motor vehicles, which is inexpensive to produce, has a high operating reliability and Le bensdauer, is easy to handle and is dimensionally stable even with ho hem line vacuum.

The object is achieved by an air line according to claim 1 and claims 15 to 17, preferred embodiments show, however, from the dependent claims.

According to the invention, the flexible conduit section consists at least partially or preferably completely of an elastic plastic material, particularly preferably a thermoplastic elastomer, wherein the areas of increased bending stiffness have at least two ribs running around the circumference of the conduit, an area being provided between the ribs with respect to this lesser wall thickness , The ribs, at least one or preferably both, are preferably circumferentially circumferentially circumferentially around the circumference of the pipe, if necessary, the ribs may consist of several circumferential segments. As a result, the line has a flexibility due to the elastomeric properties of the material, which is particularly adapted to the requirements of an air line for motor vehicles. This applies in particular to the mechanical load changes such as tensile and / or shear forces, Biegebeanspru tions, vibrations or vibrations, which in a Motor vehicle used air line is exposed. By the circumferential ribs on the line sections with increased flexural rigidity, the flexural rigidity of the line can be adapted to the requirements, in particular by dimensioning the height and / or width of the ribs. On the other hand, according to the invention, the circumferential ribs of the elastomeric plastic material, in particular thermoplastic elastomer, so that they indeed cause stiffening of the respective Leitungsab section, but still under the mechanical stress of the line management of an elastically deformable Lei tion result section. The arrangement of the ribs thus a region-wise collapse of the line can be prevented at present in the line suppression, example, when the line is used as an air intake for a Einrich tion of the motor vehicle, in particular for a turbocharger. On the other hand, by pen between the Rip provided areas with respect to the ribs of lesser wall thickness on the line section with increased Biegesteifig speed nevertheless ensures flexibility of the respective Leitungsabschnit tes, so that mechanical alternating stresses such as bending stresses of the line not auffan finally through the areas of increased flexibility conditions which are provided between the regions provided with the ribs of increased flexural rigidity. The line as a whole therefore has on the one hand a comparatively high degree of flexibility in order to withstand the alternating stresses in appli cation in a motor vehicle, on the other hand is ensured by the ribs a comparatively high rigidity of the line against a prevailing in the line underpressure and / or overpressure , However, since the ribs are made of an elastomeric material, the line cross section is still elastically deformable, so that the line has a total of a long life.

The ribs of the line sections with increased bending stiffness can in this case consist of the same material from which the Line sections with increased flexibility, which are arranged between the ribs exist. Optionally, the line sections increased flexibility, however, may also consist of a different material than the ribs, casting process, for example, by making the line in two- or multi-component injection. Preferably, the areas between the ribs, which are present in the line sections with increased bending stiffness, made of the same material as the ribs and / or the line sections with increased flexibility. The flexible conduit section with the ribs can thus consist of a uniform material. As a result, be particularly favorable mechanical properties of the line are given as transitions from different materials or connec tion or joining areas of different materials are avoided, which are often a weak point in terms of material fatigue.

The "areas of lesser wall thickness" are generally to be understood in the context of the invention as areas of the line sections with increased bending stiffness.

The "areas of increased bending stiffness" generally experience in the context of the invention at a bending stress of the line transverse to its longitudinal direction or longitudinal extent a small re angle change with respect to the bending radius than the areas of increased flexibility. Thus, if the line is subjected to a bending stress at a given bending radius, a greater elongation than the areas of increased bending stiffness occurs in the flexible line sections to compensate for the elongation of the line due to the bending stress. This refers to the outer radius of the conduit relative to the center of curvature of the bend. It is understood that with respect to the inner radius of the conduit, which faces the center of the radius of curvature, the areas of increased flexibility experience greater compression than the areas of increased flexural rigidity. The same applies in each case to acting lateral forces, which cause a lateral offset of line sections relative to the not claimed by äuße re forces state of the line.

The ribs are preferably solid and placed on the continuous conduit wall. The ribs are preferably arranged on the outside of the conduit wall.

The line described according to the invention relates in each case in particular to the line without acting on these external forces, including a line vacuum.

The distance between adjacent ribs within a Leitungsab section with increased bending stiffness is preferably clotting ger than the rib spacing between different areas of increased bending stiffness, between which a Leitungsab section increased flexibility is provided, even if this is not mandatory.

A line section of increased flexibility can also be formed by the shape of the pipe wall longitudinal section in the longitudinal direction of the pipe. Thus, the longitudinal section profile of the line wall in the region of the flexible line section has a greater curvature than in the region of increased bending stiffness. The conduit wall can thus, for example in line longitudinal direction in the region of the flexible line sections have a V-shaped course and in the areas of increased bending stiffness a more elongated course, possibly also a course substantially parallel to the line longitudinal direction. The smaller radius of curvature or smaller angles in the line section areas increased flexibility thus acts in the manner of a hinge, compared to the areas of increased bending stiffness.

Preferably, the ribs in the longitudinal direction obliquely rising flanks, so that at transition areas of Line sections of different bending stiffness change the mechanical properties of the line wall at least rather continuously and more or less drastic jumps of mechanical properties with respect to the longitudinal direction extending in Lei line wall profiles are avoided. As a result, the line has an increased service life with mechanical alternating stresses. In particular, the ribs can have an at least essentially triangular, trapezoidal or wave-shaped cross-section.

Preferably, the wall thickness of the ribs is greater than the areas of lesser wall thickness lying between them by a factor of> 1.25, whereby the areas of "lesser wall thickness" as generally within the scope of the invention are in the region of increased bending rigidity of the line section Ribs by a factor of> 1.5 or> 2, more preferably> 3, greater than the intervening areas of lesser wall thickness The rib wall thickness may be less than a factor of 5 or less than a factor of 3 of the wall thickness of the areas of lesser wall thickness therebetween On the one hand, the area of increased bending stiffness of the Lei processing section by the ribs particularly stabilized, on the other hand, this has a relatively high flexibility due to the intermediate preparation Ches lesser wall thickness, so that mechanical cycling, in particular bending stresses and / or shear forces on the Leit In some cases, it must also be absorbed by the region of increased flexural rigidity and not only by the region of increased flexibility between the ribs. As a result, particularly güns term mechanical properties of the air line are given, which stabilize the line sufficiently by the ribs, in particular special in relation to a collapse of the line due to a negative line pressure, which would affect the function of the Luftlei tion beyond the intended tolerances addition. Preferably, arranged between the ribs preparation che lesser wall thickness, which together with the ribs forming the areas of increased bending stiffness of the line, a higher wall thickness than the arranged between the areas of increased bending stiffness peripheral regions of the line with increased flexibility. The arranged between the ribs area of lesser wall thickness may have a wall thickness which is greater than the wall thickness in the wall region he increased flexibility, but possibly also not by the factor> 1.25 or> 1.5, optionally also> 2 or> 3 greater than the factor 5 or the factor 3. As a result, on the one hand, the region of increased bending stiffness has a certain flexibility, but the region of increased flexibility of the line section absorbs the deformation forces on the line to a greater extent or as far as possible. Optionally, however, the region of increased flexibility can also have at least approximately the same wall thickness as the region of lesser wall thickness arranged between the ribs, wherein the increased bending stiffness is brought about by the ribs or the shape of the conduit wall.

Preferably, the flexible line section has a sequence of wave crests and wave troughs with respect to the longitudinal direction of the line, wherein the ribs are arranged with between them angeord Neten areas of lesser wall thickness in the region or at the wave crests. This preferably applies to the shaping of the conduit wall, so that the wave crests and troughs are arranged on the inside and outside of the conduit wall. The areas of increased flexibility are preferably arranged in the wave valleys. The areas of the troughs with increased flexibility thus contribute significantly to the flexibility of the Lei device, with their stability in particular against a suppression in the line is thus essentially justified by the wave crests. The arrangement of the ribs on the wave crests additionally stabilizes them, whereby the ribs are made of the same material as the one between them. arranged regions of lesser wall thickness and the areas he increased flexibility or the areas of wave troughs may exist, so that the flexible line section can be made entirely of a thermoplastic elastomer material, preferably preferably from a single material. Where appropriate, the materials of the line in the troughs and the wave crests and / or the regions of the ribs and the intermediate regions of lesser wall thickness may also consist of different materials, preferably each of thermoplastic elastomers, such a line in the multi-component injection molding process particularly accurate and reproducible can be produced. Such a line thus has a total of particularly advantageous mechanical properties th, especially at high mechanical Wechselbeanspru calculations, as they exist in an air line as the air intake of a turbocharger of a motor vehicle.

Preferably, the area of increased flexibility between the ribs has a smaller inner diameter than the area of lesser wall thickness between the ribs. The region of increased flexibility may be associated with a trough, the region of lesser wall thickness between the ribs a waves mountain. As a result, particularly favorable mechanical properties of the line are given with regard to their flexibility in the case of mechanical alternating stresses on the one hand and dimensional stability under line vacuum.

Preferably, the area of lesser wall thickness between the fins, which is a part of a line section with increased flexural rigidity, has at least approximately the same or a larger inner diameter as the inner diameter of the fins. About the same inner diameter is when the inner diameter of the smaller wall thickness region differs from the inner diameter of the ribs by less than 1 times the rib height or less than or equal to 0.5 times or less than 0.25 times the rib height , The rib height results here from the extension of the rib of the inner line wall to the ridge or outer diameter of the rib relative to a line cross section perpen- dicular to the direction of conduction, wherein the cross section extends through the ridge of the rib. Preferably, the inner diameter of the region of lesser wall thickness is not more than 2 times or more than 1 times the rib height greater than the Rip penaußendurchmesser, preferably the region of reduced wall thickness between the ribs is arranged at the level thereof. As a result, the region of lesser wall thickness between the ribs is radially spaced from the region of increased flexibility between the ribs and arranged at least approximately between the Rip pen, so that in tensile and shear forces on the Lei direction in the longitudinal direction of the region of lesser wall thickness only a comparatively small Angular deformation undergoes, in contrast to the area of increased flexibility between the ribs, which absorbs increased increases in tensile and / or shear forces on the line changes in length of the line and acts in the manner of joint areas. As a result, the line has advantageous mechanical properties. Particularly preferably, the area of lesser wall thickness may be formed from the lower region of the ridge pen height, for example the lower third of the rib height or, in particular, at the base of the ribs. The contour of the inner line wall in the region of two adjacent ribs and lying between these area lesser wall thickness or in the region of a wave crest can be formed at least substantially zy-cylindrical, whereby this area in particular with respect to tensile and / or shear forces in the longitudinal direction of a high stability having no elongation of the line.

The area of lesser wall thickness between the ribs may have a wall thickness of greater than or equal to 0.5 mm equal to 1 mm, preferably less than or equal to 2 mm equal to 1.5 mm, so that this has a significant flexibility but the line through the ribs has sufficient under or over pressure resistance. The wall thickness or height of the ribs may be greater by a factor equal to 1.25 or greater than or equal to 1.5, preferably greater than or equal to 2 equal to 3 than the wall thickness in the range clotting gerer wall thickness between the ribs. Preferably, the wall thickness of the ribs by a factor of <10 or <5 is greater than the wall thickness in the region lying between the ribs of lesser wall thickness. The ribs can thereby cause a suffi cient underpressure or overpressure stiffness of the line.

The areas of increased bending stiffness of the line section may each have 2, 3 or more in the line longitudinal direction aufei nanderfolgende ribs, more preferably not more than three, so that a close sequence of areas of increased and flexural rigidity and increased flexibility may be given in the longitudinal direction of the line.

Particularly preferably, the line is produced by injection molding. As a result, the line with the unterschiedli chen wall thickness ranges such as ribs, areas increased flexibility Flexi etc. particularly accurate to produce exactly what conditions are particularly well-defined mechanical properties of the conditions and a long service life of the same result.

Particularly preferably, the conduit consists at least partially or completely of a thermoplastic copolymer (TPC), particularly preferably in a proportion of> 50% by weight,> 75% by weight,> 85% by weight or at least virtually completely. This refers to the content of organic plastics of the line, so regardless of fillers, fiber reinforcements such as Glasfa fibers or the like. It has been found that an air duct made of a TPC polymer excellently meets the mechanical and thermal requirements, especially when the duct is used for connection to a hot component such as a turbocharger. The TPC polymer may in particular be a thermoplastic polyester elastomer which has very good mechanical and thermal properties for the application. united. For individual applications, but generally less preferred, the elastomer may also be, for example, a styrene block copolymer (TPS) a thermoplastic polyurethane or thermoplastic polyether-polyamide. A TPC material is therefore also particularly preferably used, since this compared with a vulcanized thermoplastic material has a higher strength and thus higher pressure and / or under compressive strength. Even in applications with high negative or positive pressure in the line as a clean air line or charge air line of a turbocharger line of the invention has proven particularly useful, especially in conjunction with components which at least substantially (eg. To more than 50 wt .-%) or completely made of polyalkylene terephthalate (PAT) or more preferably (polybutylene terephthalate) PBT.

In a thermoplastic elastomer is usually a multi-phase plastic with elastically deformable Mole külbereichen ago, in which areas of fusible, especially amorphous thermoplastics are installed. When copolymer are generally understood in two or more phases plastics or optionally also polymer blends. The thermoplastic elastomer thus usually consists of an elastic soft phase and a thermoplastic type hard phase. The hard phase is usually a matrix, so that the polymer material is thus at least partially or completely meltable and processable by injection molding. The hard segments may here be amorphous or partially crystalline, for example also by ion clusters thermally reversibly crosslinked macromolecules aufwei sen with low crosslinking density. Optionally, it is also possible to use blends of thermoplastics with certain or high proportions of crosslinked or uncrosslinked elastomer phase. The elastomeric phase can be formed from crosslinked to form a vulcanized thermoplastic, particularly preferably not vulka nized thermoplastic elastomers are used due to the increased strength and / or bending stiffness of the material, so that the Line an increased negative or positive pressure without deformation or collapse can be formed.

The Shore hardness of the elastomeric conductor material is preferably in the range of 30 Shore A to 80 Shore A, where appropriate, also higher, more preferably in the range of 35 to 50 Shore A. For certain applications as in Reinluftleitun gene is a hardness of 30- 50 Shore A particularly preferred, for other applications, especially at higher internal pressure as in charge air ducts, a hardness of 40-80 Shore A. The E-tensile modulus of the elastomeric Ööleitungsmaterials is preferably in the range of 20 to 100 MPa. The data relate to the relevant DIN standards with effect from 1 January 2018. The line material can in this case have a permanent temperature resistance of greater than or equal to 100 ° C., preferably> 120 ° C., preferably> 130 ° C.

The air line according to the invention is particularly preferably designed as an air line for use in the engine area, which supplies a device of the engine or drive device such as in particular a turbocharger with air or discharges it from the device. The line can in particular be designed as a clean air line for supplying clean air to the device, as a charge air line, in particular even at high loading pressures, or blank air line, in particular for the air management of a turbocharger. Optionally, the line according to the invention can also be used for air supply or air removal of another device of a motor vehicle such as intercooler, heat exchanger or the like.

Preferably, the line is at one end of a line with a hot component such as a turbocharger, blower or other force vehicle component and connected to the other end of the line with a cold component such as an air intake, filter housing or the like. Due to the different operating temperatures of the genann th components and thus high thermal loads of Lei tion, the line according to the invention has proven to be particularly advantageous before.

Preferably, at least one end of the line is connected to an on closing part connected to a device or connectable device such as turbocharger, filter housing, etc., wherein the connecting part is preferably by injection molding Herge is. As a result, the line and the connector can be in a two- or multi-component injection molding Herge provides, preferably in the same injection molding tool in a production cycle.

Preferably, the connection part has at least one undercut with respect to the longitudinal extent of the line, which is engaged behind by the material of the line, preferably by injection molding by means of injection. As a result, a high level of reliability and longevity is given in particular to tensile and / or shear forces on the line.

Preferably, the connecting part has at least one area or more distributed around the circumference of the cable arranged che surface, which are completely surrounded by the line material based on a longitudinal section of the line, example, are overmolded. As a result, the connection between the line and the connection part has a high mechanical strength, in particular also with respect to forces across the line, such as, for example, vibrations or vibrations. In addition, such a configuration is particularly simple and advantageous to produce by injection molding.

The connection part can in this case represent, for example, a sleeve, flange, housing area or the like of the respective device. Particularly preferably, the connection part consists at least partially or completely of a polyalkylene terephthalate (PAT), in particular polybutyl terephthalate (PBT). The con nection to this part to> 50 wt.% Or> 75 wt. %, be particularly preferably> 85 wt.% Or at least practically fully constantly consist of PAT or PBT. On the one hand, one of the like material has advantageous mechanical properties and can be processed by injection molding. In particular, in combination with a thermoplastic polyester copolymer, however, there is also a particularly intimate bond between the line material and the material of the con nection part, which may optionally also have the strength ei ner chemical compound between the two Tei len mentioned. This is attributed to the fact that both parts comprise ester groups, it also being possible for a transesterification in the connection region of the two parts during the production of the same to take place. Particularly in the case of high underpressures or overpressures in the line, such as, for example, as a clean air line or intake line or charge air line of a turbocharger, this embodiment has proven particularly useful. Optionally, however, the connection part can also consist of polycarbonate or polycarbonate / ABS or contain these components to a certain extent, for example> 5% by weight or> 10% by weight, if appropriate also> 25% by weight, preferably not> 25% by weight or not> 10% by weight.

Due to the one-piece connection of the line with the connection part, in particular by injection molding, thereby wei tere fastening means for fixing the line to the walls Ren device such as a filter housing is not required, as otherwise in conventional applications in the form of separate nips, clips or the like must be provided. The production and in particular also assembly of the line is thereby considerably simplified. Particularly preferably, the line consists of TPC, wherein the line with a connection part of a motor vehicle device, which consists at least partially or completely of PAT or in particular PBT, welded. In particular, the device may be a motor vehicle device which is disclosed in the context of the invention. The welding process is particularly preferably carried out as hot gas welding. Such a compound of line and connector part in particular at high mechanical and thermal stress on the line, also alternating stresses, particularly proven, which is also exposed to the connection region of the line and connector. The application of the hot-gas welding method is particularly preferred, since here is an United bond high resilience and high dimensional accuracy achieved bar, especially in relation to the scope of the present invention, wherein the heat input to the United binding area is exactly limited. The welding process can be carried out directly in the injection molding tool, whereby the Lei line connection is procedurally simple but at the same time with high accuracy feasible and the connection area has a long service life.

The invention will now be described by way of example with reference to an exemplary embodiment. All features of the Ausfüh approximately example are also independently or in combination nation with each other generally disclosed in the context of the invention. Show it:

FIG. 1 shows a cross section of a section of the invention,

FIG. 2 shows an alternative embodiment of the line section according to the invention,

FIG. 3: A line according to FIG. 2 with connecting parts. 1 shows a cross-sectional drawing of a flexible line section according to the invention with an axis A. The regions 12 of increased flexural rigidity of the line 1 have at least two circumferentially circumferential ribs 14 and in each case one region 15 arranged between two adjacent ribs with a small wall thickness relative to the ribs 14. The ribs 14 are circumferentially formed circumferentially around the circumference. The Wan extension 13 of the flexible conduit section including the ribs consists of a resilient plastic material, in particular a thermoplastic elastomer. The ribs 14 are solid and - seen geometrically - placed on the pipe wall and net angeord on the outside of the pipe wall.

The wall thickness of the ribs 14 is greater by a factor> 1.25 than the wall thickness of each arranged between adjacent ribs 14 areas of smaller wall thickness 15. The arranged between the ribs 14 areas of lesser wall thickness 15 have a higher wall thickness than that between the Berei chen 12 increased bending stiffness arranged peripheral portions 11 of the line with increased flexibility.

The respective rib 14 may extend in width over 5% -45% of the extent of the region of increased flexural rigidity in the longitudinal direction of the conduit, more preferably above 10% -40% or 15% -35% of the same. The area of lesser wall thickness 15 between the ribs 14 has at least approximately the same or a larger inner diameter than the inner diameter of the ribs 14. The wall thickness of the ribs is larger by approximately a factor of 3 than the area of lesser wall thickness between the ribs 14.

The regions 11 of increased flexibility between the ribs 14 have a smaller inner radius IF than the radius of the arranged between the ribs 14 region of increased bending stiffness 15th The wall of the flexible conduit section 10, comprising the areas of increased flexibility 11 and increased flexural rigidity 12, including the ribs 14, consists of a thermoplastic elastomer. The wall of the flexible Leitungsabschnit TES 11 consists at least partially, preferably completely, of a thermoplastic copolymer (TPC), in particular of a thermoplastic polyester elastomer. This refers to each of the plastic component of the line section, the material may be fiber reinforced and contain fillers. The pipe is manufactured by injection molding.

In the embodiment of FIG. 2, the ribs 14 have a substantially triangular cross-sectional shape. The flexible line section 10 is based on the longitudinal direction of the line from a sequence of wave crests 16 and troughs 17, so with bellows training of Leitungsabschnit tes 10. The ribs 14 with the arranged between these areas lesser wall thickness 15 are in the area or on the Wave crests 16 arranged.

Fig. 3 shows an example of an air line 1 for motor vehicles GE, in particular for connecting a hot member 20 with a cold member 25. At a first end 2 of the line are first connecting means 3 for airtight fixing of the line 1 to a first component 20 and at the second end 4 of the Lei direction second connecting means 5 for airtight fixing of the line to a second component 25 is provided. The connecting elements are an integral part of the line. At least one flexible line section 10 is provided between the first and the second connection means 3, 5 of the line 1. The flexible conduit section 10 has a sequence of successively arranged regions 11 of increased flexibility and regions 12 of increased flexural rigidity, which here consist of the same material and are integrally formed on one another. Here, the connecting means 3 or 5 of the line and / or the connecting part of the further, preferably rigid component are PBT (polybutylene terephthalate). but the line is not limited to this field of application and, for example. Can be used as a charge air line or pipe, in particular in each case for the supply of a turbocharger.

The connection of the line with the connection part of the turbo charger or other motor vehicle device is effected in particular by welding, in particular by hot gas welding. This is especially true when the line of a TPC material and the connector at least partially or completely made of PBT (polybutylene terephthalate).

The line is connected to a hot component 20, in this case a connection 21 of a turbocharger, and a cold component 25, in this case the connection 26 of a filter housing. The Verbindungsmit tel 3, 5 on at least one or both ends 2, 4 of the line 1 are integrally connected to at least one or both connecting parts or terminal portions 21, 26, preferably with the cold component. The connection is made by injection molding.

The connection part 26 of at least one of the devices, in this case the cold component 25, has, with respect to the longitudinal extent of the line 1, a first undercut 27, which is engaged behind by the connection means 5 of the line. For this purpose, the connecting means 5 of the line is injection-molded around the undercut. The undercut may extend around a partial circumference of the line, for example a plurality of undercuts spaced apart from one another in the circumferential direction of the line may be provided. In particular, the connecting means 3, 5 of the line and / or the connection part 21, 26 of the device one or more second undercuts in the longitudinal direction of the line aufwei sen, which based on the line cross-section and / or the longitudinal section completely from the other part of line or connector are surrounded. This is the case for the undercut 28 of the connection part 26 of the cold component. Even with these undercuts 28, several of them may be distributed around the circumference of the cable. In particular, the undercuts 27 and 28 may be provided with the features described for these in combination at the connec tion area of line and connector, for example. Alternately arranged. The undercuts 27 in this case need not be fully encapsulated in each case, but may represent simple undercuts.

In general, the material of the connection means 3, 5 of the conduit may preferably consist of the same material as the flexible conduit section. This has proven particularly useful when said material is a thermoplastic elastomer, in particular TPC, which combines both strength properties and elastic properties in a particular degree for the application of the present invention.

The connection part 26 consists at least partially, in this case completely constantly, of polyalkylene terephthalate, more precisely polybutylene terephthalate (PBT). Especially in combination with a PC line based on thermoplastic polyester elastomers, there are special advantages.

The flexible conduit material may have a hardness of about 40 Shore A and an E-tensile modulus of 50 MPa. bo / do / ib April 23, 2019

Applicant:

MONTAPLAST GMBH

51590 Morsbach

Air line for motor vehicles

LIST OF REFERENCE NUMBERS

1 line

2 first line end

3 first connection means

4 second line end

5 second connecting means

10 flexible line section

11 range of increased flexibility

12 range of increased bending stiffness

13 wall

14 ribs

15 area of low wall thickness

16 wave mountain

17 wave valley

20 hot component

21 connection part

25 cold component

26 connection part

27 first undercut

28 second undercut

Claims

bo / do / ib 23 April 2019 Applicant: MONTAPLAST GMBH 51590 Morsbach Air duct for motor vehicles Claims

1. air line for motor vehicles, in particular for connecting a hot component (25) with a cold component (21), wherein at a first end (2) of the line (1) first connection means (3) for airtight fixing the line to a first component ( 20) and at the second end (4) of the conduit second connecting means (5) for airtight fixing of the line to a second component (25) are provided, wherein at least one flexible line section (10) between the first and the second connecting means (3 , 5) the Lei device (1) is provided, wherein the flexible Leitungsab section (10) has a sequence of successively arranged Be rich increased flexibility (11) and increased bending stiffness (12), which preferably consist of the same material and integrally with each other are formed, characterized in that the areas of increased bending stiffness (12) of the line at least two circumferentially around running ribs (14) and one between the two ribs (14) arranged region with respect to the ribs (14) have a small wall thickness, and that the wall of the flexible conduit portion (10) including the ribs (14) is made of a resilient plastic material be.

2. Line according to claim 1, characterized in that the wall thickness of the ribs (14) by a factor of> 1.25 is greater than the wall thickness of each between adjacent ribs (14) arranged areas of lesser wall thickness (15).

3. Line according to claim 1 or 2, characterized in that between the ribs (14) arranged regions ge ringerer wall thickness (15) have a higher wall thickness than between the areas of increased flexural rigidity (12) arranged peripheral regions of the line with increased flexibility ( 11).

4. Line according to one of claims 1 to 3, characterized in that the flexible line section (10) based on the longitudinal direction of the conduit (1) consists of a sequence of wave crests and troughs and that the ribs

(14) with the arranged between these areas clotting gerer wall thickness (15) in the region or on the Wellenber conditions are arranged.

5. Line according to one of claims 1 to 4, characterized in that the areas of increased flexibility (11) between tween the ribs (14) have a smaller inner radius than the between the ribs (14) arranged region clotting gerer wall thickness (15) ,

6. Line according to one of claims 1 to 5, characterized in that the region of lesser wall thickness (15) between tween the ribs (14) at least approximately the same or egg nen larger inner diameter than the inner diameter of the ribs (14).

7. Line according to one of claims 1 to 6, characterized in that the wall thickness of the ribs (14) by a factor> 1.25 is greater than the region of lesser wall thickness

(15) between the ribs (14).

8. Line according to one of claims 1 to 7, characterized in that the wall of the flexible Leitungsabschnit TES (10), including the ribs (14), consists of a thermoplastic elastomer.

9. Line according to one of claims 1 to 8, characterized in that the wall of the flexible Leitungsabschnit TES (10) at least partially or completely from a thermoplastic copolymer (TPC), preferably at least partially or completely from a thermoplastic polyester polyester elastomer.

10. Line according to one of claims 1 to 9, characterized in that the line (1) is made by injection molding.

11. Cable according to one of claims 1 to 10, characterized in that the line (1) with a hot component (20) and a cold component (25) is connected.

12. Line according to one of claims 1 to 11, characterized in that at least one line end (2,4) with a connecting part (21,26) connected to the line o- connectable device (20,25) is connected, preferably by injection molding.

13. A pipe according to claim 12, characterized in that the connecting part (21,26) with respect to the longitudinal extent of the line has an undercut (27) and that the Ver connecting means of the line the undercut (27) engages behind.

14. A lead according to claim 12 or 13, characterized in that the connection part consists partially or completely of polyalkylene terephthalate (PAT) or polybutylene terephthalate (PBT).

15. turbocharger with an air line according to one of Ansprü che 1 to 14, characterized in that the first connecting means of the line to a clean air inlet of the turbocharger can be connected or connected.

16. Filter housing with air line according to one of claims 1 to 14, characterized in that the second Ver connecting means of the line to an air outlet of a filter housing can be connected or connected.

17. Connecting part of a motor vehicle device with a line according to one of claims 1 to 14, characterized in that the connecting part at least teilwei se or completely of polyalkylene terephthalate (PAT) or polybutylene terephthalate (PBT), that the line of a thermoplastic copolymer (TPC) be and that the line with the connection part is ver welded.