Air pipe for motor vehicles

Abstract

An air pipe for motor vehicles, in particular for connecting a hot component to a cold component, is provided. A first connector at a first end of the pipe is provided for securing the pipe in an airtight manner to a hot component and a second connector at a second end of the pipe is provided for securing the pipe in an airtight manner to a cold component. At least one flexible pipe portion is provided between the first and the second connectors. Supporting rings made from a material which is dimensionally stable in relation to the flexible pipe material are provided. The supporting rings surround a free pipe cross section and stabilize the cross-sectional shape of the flexible pipe portion.

Claims

1. An air pipe for motor vehicles comprising: a first connector at a first end of the pipe for air-tightly fixing the air pipe to a hot component; a second connector at a second end of the pipe for air-tightly fixing the pipe to a cold component; at least one flexible pipe portion between the first and the second connectors; a free pipe cross-section; and support rings constructed of a material which is dimensionally stable in relation to a material of the flexible pipe portion, the support rings surrounding free pipe cross-section and stabilizing the flexible pipe portion in its cross-sectional shape, wherein the pipe has an inner curvature and an outer curvature, and each of the support rings defines a respective first width, in a longitudinal direction of the pipe, proximate the inner curvature and defines a respective second width, in the longitudinal direction of the pipe, proximate the outer curvature, the first width being smaller than the second width.

2. The pipe as set forth in claim 1, wherein the support rings and the flexible pipe material are produced in a two or multi-component injection molding method.

3. The pipe as set forth in claim 1, wherein the support rings are connected to the flexible pipe material in force-locking and/or positively locking and/or material-bonded relationship in relation to a movement of the support rings relative to the material of the flexible pipe portions in the longitudinal direction of the pipe.

4. The pipe as set forth in claim 1, wherein the support rings are arranged radially at the inside at the wall of the flexible pipe portion.

5. The pipe as set forth in claim 1, wherein the flexible pipe portion is of a smooth-walled configuration at the inside wall.

6. The pipe as set forth in claim 1, wherein the pipe has a curvature in the pipe longitudinal direction and the support rings in the region of the outer curvature of the pipe have a greater angular extent in the curvature direction than the regions of the flexible pipe material, that are between the support rings.

7. The pipe as set forth in claim 1, the pipe has a curvature in the pipe longitudinal direction and the support rings in the region of the inner curvature of the pipe have a smaller angular extent in the curvature direction than the regions of the flexible pipe material, that are between the support rings.

8. The pipe as set forth in claim 1, wherein the support rings are at least partially or completely surrounded by the material of the flexible pipe portion.

9. The pipe as set forth in claim 1, wherein the flexible pipe portion has wave crests and wave troughs and the support rings are arranged in the region of the wave crests.

10. The pipe as set forth in claim 9, wherein the support rings are laterally at least partially enclosed by the portions of the wave crests, that extend in a direction towards the wave troughs.

11. The pipe as set forth in claim 9, wherein between a wave crest and a wave trough the flexible pipe portion has a non-rectilinear transition.

12. The pipe as set forth in claim 1, wherein the material of the flexible pipe portion is a TPV elastomer.

13. The pipe as set forth in claim 1, wherein the flexible pipe material at least partially or completely comprises an TPC elastomer.

14. The pipe as set forth in claim 1, wherein the material of the support ring is a polyamide.

15. The pipe as set forth in claim 1, wherein the first and/or the second connectors of the pipe are formed on a rigid component.

16. The pipe as set forth in claim 1, wherein the first and second connectors of the pipe and/or the rigid component comprise polyalkylene terephthalate (PAT) or PBT (polybutylene terephthalate).

17. The pipe as set forth in claim 1, wherein, at the first and second connectors, the pipe is connected to a hot air component and/or a cold air component of a motor vehicle.

18. A turbocharger having an air pipe as set forth in claim 1, wherein the first connector of the pipe can be or is connected to a clean air intake of the turbocharger.

19. A filter housing having an air pipe as set forth claim 1, wherein the second connector is or can be connected to an air outlet of the filter housing.

20. A connecting portion of a motor vehicle device having a pipe as set forth in claim 1, wherein the connecting portion at least partially or completely comprises polyalkylene terephthalate (PAT) or PBT (polybutylene terephthalate), the pipe comprises TPC and the pipe is welded to the connecting portion.

Description

BRIEF DESCRIPTION OF THE SEVERAL VIEWS OF THE DRAWINGS

(1) The foregoing summary, as well as the following detailed description of the invention, will be better understood when read in conjunction with the appended drawings. For the purpose of illustrating the invention, there are shown in the drawings embodiments which are presently preferred. It should be understood, however, that the invention is not limited to the precise arrangements and instrumentalities shown. In the drawings:

(2) FIG. 1 shows a plan view of a component arrangement of an air pipe according to the invention with connecting portions of a hot air component and a cold air component,

(3) FIG. 2 shows a longitudinal section of a pipe according to the invention of a first embodiment, and

(4) FIG. 3 shows a longitudinal section of a pipe according to the invention of a further embodiment.

DETAILED DESCRIPTION OF THE INVENTION

(5) FIG. 1 shows an air pipe 1 according to the invention for motor vehicles, in particular for connecting a hot component 20 to a cold component 25, wherein provided at a first end 2 of the pipe is a first connector 3 for air-tightly fixing the air pipe 1 to the hot component 20 while provided at the second end 4 of the pipe is a second connector 5 for air-tightly fixing the pipe to the cold component 25. At least one flexible pipe portion 10 is provided between the first and the second connectors 3, 5. The pipe has a free pipe cross-section. The hot component 20 can be welded to the connector 3 of the pipe. The cold component 25 can be connected integrally to the second connector 5 of the pipe 1, for example being injection molded thereto. The first and the second connector 3, 5 of the pipe can be in the form of a rigid component like for example a socket or connecting piece. A corresponding configuration can apply for the connecting portions of the components connected with the pipe like the hot and/or cold component, without being restricted thereto. The connector 3 or 5 of the pipe and/or the connecting portion of the other preferably rigid component here comprise PBT (polybutylene terephthalate). The hot component 20 here is the connecting portion of a turbocharger while the cold component 25 is a filter housing for filtering induction air of the turbocharger, wherein the pipe however is not limited to that area of use and for example can be used as a charge air pipe or an unfiltered air pipe, in particular in each case for supplying a turbocharger.

(6) The connection of the pipe to the connecting portion of the turbocharger or another motor vehicle device is effected in particular by welding, more especially by hot gas welding. That applies in particular if the pipe comprises a TPC material and the connecting portion at least partially or completely comprises PBT (polybutylene terephthalate).

(7) In the embodiments in FIGS. 2 and 3 the flexible pipe portion 10 has a wall 11 comprising a flexible pipe material. The wall is of an air-tight configuration in the manner of a hose. The wall 11 extends continuously over the length and the periphery of the pipe portion. According to the invention there are support rings 12 comprising a material which is dimensionally stable in relation to the flexible pipe material, which support rings surround the free pipe cross-section and stabilize the flexible pipe portion in its cross-sectional shape. The support rings 12 are spaced from each other in the pipe longitudinal direction, portions 13 of the flexible pipe material extending between the support rings 12.

(8) Unless otherwise indicated from the context the passages of description respectively apply to all embodiments.

(9) The flexible pipe portion, that is to say the wall 11 together with the support rings 12, is produced in a two-component injection molding method. The wall 11 and the support rings 12 are adhesively joined together by the injection molding procedure and the material selection.

(10) The support rings 12 are connected to the flexible pipe material in force-locking and/or positively locking and/or material-bonded relationship in relation to a movement of the rings relative to the material of the flexible pipe portion in the longitudinal direction of the pipe. That is effected on the one hand by the above-mentioned adhesive forces. On the other hand at their ends 12a the support rings are enclosed by the flexible pipe material, with same bearing snugly against each other. The pipe material therefore extends, bearing against the support rings, at least over a part of the thickness of same. In that case the support rings 12 are arranged in grooves (FIG. 2) or in wave crests (FIG. 3) of the flexible pipe material. The support rings 12 are arranged radially inwardly at the wall 11 of the flexible pipe portion.

(11) According to the embodiment of FIG. 2 the flexible pipe portion has a smooth inside wall, being therefore free from projections or recesses or other profilings. That relates both to the insides 12b of the support ring and also the lengthwise portions 14 of flexible pipe material between the support rings. On the outside the support rings 12 have rib-shaped profilings 13 which cooperate in congruent relationship with negatively shaped profilings of the flexible pipe material, which can be effected by injection molding of pipe material and support ring material to each other. The mechanical connection of the pipe material and the support rings, in particular in relation to forces in the longitudinal direction of the pipe, is thereby substantially improved.

(12) As shown in FIG. 2 the support rings 12 are arranged in the region of a curvature of the pipe and in the longitudinal direction of the pipe in the region of the inner curvature of the pipe they are of a smaller width B1 than the width B2 in the region of the outer curvature of the pipe. In the region of the outer curvature of the pipe the support rings 12 have a greater angular extent in the curvature direction than the regions 14 of the flexible pipe material, that are between the support rings 12. In the region of the inner curvature of the pipe the support rings 12 have a smaller angular extent in the curvature direction than the regions 14 of the flexible pipe material, that are between the support rings. The angular extent refers in each case to the curvature center point M of the pipe, which defines the curvature radius.

(13) As shown in FIGS. 2 and 3 the support rings 12 are at least partially or completely enclosed by the material of the flexible pipe portion. For that purpose the support rings 12 are arranged in grooves in the flexible pipe material (FIG. 2) or in wave crests (FIG. 3), wherein the flexible pipe material bears at the respective ends against the support rings 12, preferably being adhesively joined thereto.

(14) In the embodiment in FIG. 3 the flexible pipe portion 10 is of a bellows-like configuration with wave crests 16 and wave troughs 17 and the support rings 12 are disposed in the region of the wave crests 16. The flexible pipe material also encloses the ends 12a of the support rings over at least a part of the material thickness thereof. The support ring ends 12a are set inclinedly in the radial direction or are of a frustoconical configuration. Between a wave crest 15 and a wave trough 16 the flexible pipe portion has a respective non-rectilinear transitional region 17 which directly adjoins the support ring end face 12a, which has been found to be particularly advantageous in relation to mechanical alternating stresses as in the case of oscillations. For stiffening the support ring a peripherally extending rib 18 is provided at the inside 12c thereof.

(15) As shown in FIG. 3 the connecting region of the component 25 that is connected to the pipe has the first connector 3 of the pipe injection molded therearound. In this case the component 25 has at least one radial projection 25a which, viewed in the longitudinal direction of the pipe, has the flexible pipe material injection molded therebehind. The projection 25a can extend peripherally or can be in the form of a plurality of projections arranged distributed in the peripheral direction. In addition provided on the component 25 is an abutment 25b, here in the form of a peripherally extending flange, against which the end face of the pipe end bears and is thus protected.

(16) The material of the flexible pipe portion 10 in accordance with the embodiment of FIG. 2 but also that of FIG. 3 is here a TPV elastomer. The material of the flexible pipe portion 10 of the embodiment of FIG. 3 but possibly also FIG. 2 is here a TPC elastomer. The material of the support ring 12 can respectively be a plastic material, in particular a hard plastic, more especially preferably polyamide.

(17) The flexible pipe material can be of a hardness of about 40 Shore A and a tensile modulus of elasticity of 50 MPa.

(18) It will be appreciated by those skilled in the art that changes could be made to the embodiments described above without departing from the broad inventive concept thereof. It is understood, therefore, that this invention is not limited to the particular embodiments disclosed, but it is intended to cover modifications within the spirit and scope of the present invention as defined by the appended claims.

LIST OF REFERENCES

(19) 1 pipe 2 first end 3 connector 4 second end 5 connector 10 flexible pipe portion 11 wall 12 support ring 12a support ring end 12b support ring inside 13 profiling 14 region of the flexible pipe portion 15 wave crest 16 wave trough 17 transitional region 18 support ring rib 20 hot component 25 cold component 25a projection 25b abutment B1 first width B2 second width