HOSE, HOSE ARRANGEMENT AND CORRESPONDING PROCESS FOR MANUFACTURING A HOSE ARRANGEMENT

Abstract

A hose (1) having an inner hose (2) from an uncured, thermoplastic material is produced and the inner hose (2) is thermally expanded.

Claims

1. A hose (1), comprising: an inner hose (2) and a braid (3), the inner hose (2) comprising an uncrosslinked, thermoplastic material, the braid (3) has a coverage between 75% and 98%, the inner hose (2) is manufactured from PE-RT having a melt flow index (190° C./2.16 kg) of 0.5 to 2 g/10 min and a density of 0.925 to 0.960 g/cm.sup.3, an outer diameter D of the inner hose (2), given and measured in mm, and a wall thickness s of the inner hose (2), given and measured in mm, satisfy the following:
A≤10000*s/D.sup.1.5
and
10000*s/D.sup.1.5≤B, wherein A>=390 1/mm.sup.0.5, and B<=585 1/mm.sup.0.5.

2. The hose (1) as claimed in claim 1, wherein the inner hose (2) has a density of 0.929 to 0.940 g/cm.sup.3.

3. The hose (1) as claimed in claim 1, wherein at least one of a) the outer diameter D of the inner hose (2)<10 mm, or b) the braid makes contact with the inner hose along at least one of an entire circumference or over a length of the braid.

4. The hose (1) as claimed in claim 1, wherein the braid (3) has at least one of a) a braid angle between 41° and 55° or b) the coverage is between 84% and 93%.

5. The hose (1) as claimed in claim 1, wherein the braid (3) comprises a plastic monofilament (4) having a diameter of 0.14 mm to 0.50 mm.

6. The hose (1) as claimed in claim 1, wherein the braid is made with a stainless steel monofilament (4) having a diameter of 0.14 mm to 0.50 mm.

7. A hose arrangement (5), comprising: a hose nipple (6); a hose (1) having an inner hose (2) as claimed in claim 1; the hose nipple (6) is arranged in a plug-in region (7) of the hose (1); and an outer diameter (da) of the hose nipple (6) in the plug-in region (7) is at least as great as a sum of a clear inner diameter (di) of the hose (1) measured outside of the plug-in region (7) and a wall thickness (s) of a wall (8) delimiting the clear inner diameter (di).

8. The hose arrangement (5) as claimed in claim 8, wherein the hose (1) has an inner hose (2) and the wall (8) is an inner hose wall.

9. A hose arrangement (5), comprising: a hose nipple (6); a hose (1); the hose nipple (6) is arranged in a plug-in region (7) of the hose (1); an outer diameter (da) of the hose nipple (6) in the plug-in region (7) is at least as great as a sum of a clear inner diameter (di) of the hose (1), measured outside the plug-in region (7), and a wall thickness (s) of a wall (8) delimiting the clear inner diameter (di); and the hose nipple (6), at a plug-in end (9) thereof, has an end face (11) which is oriented in a plug-in direction (10) and is planar or convexly curved in an axial portion, and the end face (11) has an outer diameter (d2) which is the same or greater than the clear inner diameter (di) of the hose (1) outside of the plug-in region (7).

10. The hose arrangement (5) as claimed in claim 9, wherein the hose includes an inner hose (2) and a braid (3), the inner hose (2) comprising an uncrosslinked, thermoplastic material, the braid (3) has a coverage between 75% and 98%, the inner hose (2) is manufactured from PE-RT having a melt flow index (190° C./2.16 kg) of 0.5 to 2 g/10 min and a density of 0.925 to 0.960 g/cm.sup.3, an outer diameter D of the inner hose (2), given and measured in mm, and a wall thickness s of the inner hose (2), given and measured in mm, satisfy the following:
A≤10000*s/D.sup.1.5
and
10000*s/D.sup.1.5≤B, wherein A>=390 1/mm.sup.0.5; the hose nipple (6) is arranged in a plug-in region (7) of the hose (1); and the hose (1), at the plug-in end (9) thereof, is widened by a thermal treatment.

11. A method for producing a hose arrangement (5) as claimed in claim 10, the method comprising: plugging-in the hose nipple (6) into the inner hose (2); before and/or during the plugging in of the hose nipple (6), widening the inner diameter (di) of the hose (1) by a thermal using a mandrel (12) heated to at least a Vicat softening temperature.

12. The method as claimed in claim 11, further comprising pushing the mandrel (12) into a push-in region (14) of the hose (1), and holding an outside of the hose (1) in the push-in region (14) or partially or completely outside the push-in region (14).

13. The method as claimed in claim 11, further comprising plugging a crimping sleeve (16) on before the widening operation.

14. A series of hose arrangements, comprising at least two variants, each of which comprises the hose arrangement as claimed in claim 1, wherein the inner hoses of the variants have at least one of differing outer diameters D or outer diameters D of less than 10 mm, less than 9 mm, and less than 7 mm.

15. (canceled)

Description

BRIEF DESCRIPTION OF THE DRAWINGS

[0057] The invention will now be described in more detail with reference to exemplary embodiments, but is not limited to these exemplary embodiments. Further exemplary embodiments will become apparent by a combination of the features of one or more claims and/or with one or more features of the exemplary embodiments.

[0058] In the drawings:

[0059] FIG. 1 shows an axial section of a hose according to the invention in the case of a hose arrangement according to the invention,

[0060] FIG. 2 shows a method according to the invention for producing a hose arrangement,

[0061] FIG. 3 shows a further method according to the invention for producing a hose arrangement, wherein the hose is held below a push-in region for a mandrel,

[0062] FIG. 4 shows a third method according to the invention for producing a hose arrangement, wherein a crimping sleeve is placed on before the widening operation, and

[0063] FIG. 5 shows a partially axially cut-open illustration of a detail of part of a hose arrangement according to the invention (on the right-hand side) and of the associated hose nipple on its own (on the left-hand side).

DETAILED DESCRIPTION

[0064] FIG. 1, in a greatly schematic form for the purpose of explaining the concept of the invention, shows a hose, denoted overall by 1, which is provided with an inner hose 2 of an uncrosslinked, thermoplastic material and a braid 3 attached to the outside of the inner hose 2.

[0065] In the exemplary embodiment, the inner hose 2 consists of PE-RT and has a melt flow index (190° C./2.16 kg) of 0.5 to 2 g/10 min and a density of 0.929 to 0.940 g/cm.sup.3. In other exemplary embodiments, the values are chosen differently, in particular a melt flow index (190° C./2.16 kg) in the range of 0.1 to 10 g/10 min and/or a density in the range of 0.925 to 0.960 g/cm.sup.3.

[0066] In the exemplary embodiment, the inner hose 2 has an outer diameter D and a wall thickness s.

[0067] The following applies for D and s in mm:

A≤10000*s/D.sup.1.5 and 10000*s/D.sup.1.5≤B,

wherein A=425 1/mm.sup.0.5, and B=565 1/mm.sup.0.5. In other exemplary embodiments, the values are chosen differently, for example in the range of A>=390 1/mm.sup.0.5, preferably A=425 1/mm.sup.0.5, and/or B<=585 1/mm.sup.0.5, preferably B=565 1/mm.sup.0.5.

[0068] It is thus possible to design series of hose arrangements comprising at least two variants, each of which is designed as described above and satisfies the abovementioned relationships.

[0069] In this respect, it may be provided that in a first variant the outer diameter D is less than 10 mm, in a second variant less than 9 mm, and/or in a third variant less than 7 mm. First variant, second variant and/or third variant may also be dispensed with, with the result that only two of the three variants remain.

[0070] In the exemplary embodiment shown, the braid 3 has a braid angle between 43° and 49° and a coverage between 84% and 93%. In other exemplary embodiments, the values are chosen differently, for example a braid angle between 41° and 55° and/or a coverage between 75% and 99%.

[0071] In a first variant, the braid 3 is made with a monofilament 4 (cf. FIG. 2) of plastic, for example of polyamide or polyester. The diameter of the monofilament 4 is 0.25 mm±0.025 mm. In other exemplary embodiments, the monofilament has a different diameter, for example in the range of 0.14 mm to 0.50 mm, in particular of 0.20 mm to 0.3 mm.

[0072] In a second variant, the braid 3 is made with a stainless steel monofilament having a diameter of 0.18 mm±0.01 mm. In other exemplary embodiments, the monofilament has a different diameter, for example in the range of 0.14 mm to 0.50 mm, in particular of 0.16 mm to 0.2 mm.

[0073] To form a hose arrangement 5 according to the invention, in the exemplary embodiment shown a hose nipple 6 is plugged into the hose 1, in this instance for example the inner hose 2, and arranged in a plug-in region 7.

[0074] An outer diameter da of the hose nipple 6 in the plug-in region 7 is at least as great as the sum of a clear inner diameter di of the hose 1 (here the inner hose 2), measured outside of the plug-in region 7, and a wall thickness s of a wall 8 delimiting the clear inner diameter di, here the wall of the inner hose 2 in the form of an inner hose wall. The hose nipple 6 thus projects on each side over half of the wall thickness s, that is to say over the center line 19 of the material of the wall 8, into the undeformed inner hose 2 (that is to say outside of the plug-in region 7).

[0075] The hose nipple 6 at its plug-in end 9 has an end face 11 oriented in the plug-in direction 10. In this respect, the end face 11 may be defined for example as an axial projection of an outer surface 17 of the hose nipple 6 as far as a first holding rib 18 in a radial plane with respect to a plug-in direction of the hose nipple, or as the planar, axially facing surface. If the hose nipple (in a further exemplary embodiment) has a conical outer shape, it is therefore possible for the end face to include the first portion of the rise on the cone as far as the first holding rib, or the end face 11 only includes the axial surface at the free end 21.

[0076] The end face 11 has an outer diameter d2 which is larger than a clear inner diameter di of the hose outside of the plug-in region 7. This has the result that it is very difficult to impossible to press the hose nipple 6 into the untreated inner hose 2.

[0077] In a further exemplary embodiment according to FIG. 5, the outer diameter d2 of the end face 11 is exactly the same as the clear inner diameter di of the (inner) hose 2 outside of the plug-in region, that is to say the undeformed hose. If the overlapping tolerance ranges of the hose nipple 6 and of the inner hose 2 are taken into account, the inner diameter di will sometimes be slightly larger or slightly smaller than the outer diameter d2. This shows that it is necessary to widen the inner hose 2 before plugging in the hose nipple, even when d2<di.

[0078] While in FIG. 1 da and d2 differ only by a height of the holding ribs 18, in this instance da is significantly greater than d2, since the hose nipple 6 tapers at its free end 21 to form a (sleeve-shaped) extension 22.

[0079] In all other respects, components and functional units that have a similar or identical function and/or design in relation to FIGS. 1 to 4 are denoted by the same reference signs and are not described again separately. The embodiments relating to FIG. 1 to FIG. 4 therefore apply correspondingly.

[0080] FIG. 2 shows a production method according to the invention.

[0081] A mandrel 12 is heated (on the left-hand side) to a temperature at least 50 K above the Vicat softening temperature of the material of the inner hose 2.

[0082] The hose 1 is widened at its plug-in end 9 by a thermal treatment using the mandrel 12 (in the center).

[0083] In the process, the hose 1 is held on the outside by holding jaws 13.

[0084] In this respect, the holding jaws 13 are placed such that they enclose and support the hose 1 in a push-in region 14.

[0085] Then, the holding jaws 13 are removed again, and the mandrel 12 is pulled out (on the right-hand side).

[0086] A plastically shaped widening 15 remains, into which the hose nipple 6 can be readily pressed. The braid 3 is not widened.

[0087] FIG. 3 shows a further method according to the invention. Components and functional units that have a similar or identical design or function in relation to the preceding exemplary embodiment are denoted by the same reference signs and are not described separately. The embodiments relating to FIGS. 1 and 2 therefore apply correspondingly here.

[0088] The exemplary embodiment according to FIG. 3 differs from that according to FIG. 2 in that the holding jaws 13 are arranged below the push-in region 14.

[0089] This has the result that the braid 3 is also widened under the influence of the mandrel 12. The inner hose 2 is thus beveled to a lesser extent in the bevel 20 than in the situation according to FIG. 2.

[0090] FIG. 4 shows a further method according to the invention. Components and functional units that have a similar or identical design or function in relation to the preceding exemplary embodiment are denoted by the same reference signs and are not described separately. The embodiments relating to FIGS. 1 to 3 therefore apply correspondingly here.

[0091] The exemplary embodiment according to FIG. 4 differs from that according to FIG. 3 in that a crimping sleeve 16 is plugged on before the widening operation. The braid 3 is therefore fixed in the plug-in end 9.

[0092] After the mandrel 12 has been pulled out (FIG. 4, on the right-hand side), the hose nipple 6 is plugged into the widening 15 and the crimping sleeve 16 is crimped.

[0093] In the case of a hose 1, it is therefore proposed according to the invention to produce an inner hose 2 from an uncrosslinked, thermoplastic material and to widen the inner hose 2 by a thermal treatment.

LIST OF REFERENCE SIGNS

[0094] 1 Hose [0095] 2 Inner hose [0096] 3 Braid [0097] 4 (Plastic/stainless steel) monofilament [0098] 5 Hose arrangement [0099] 6 Hose nipple [0100] 7 Plug-in region [0101] 8 Wall [0102] 9 Plug-in end [0103] 10 Plug-in direction [0104] 11 End face [0105] 12 Mandrel [0106] 13 Holding jaws [0107] 14 Push-in region [0108] 15 Widening [0109] 16 Crimping sleeve [0110] 17 Outer surface [0111] 18 Holding rib [0112] 19 Center line [0113] 20 Bevel [0114] 21 Free end [0115] 22 Extension [0116] D Outer diameter D of 2 [0117] s Wall thickness of 2 [0118] da Outer diameter of 6 [0119] di Inner diameter of 2 [0120] d2 Outer diameter of 11