JP2687954B2 - Fixing device for the hose part pushed into the pipe part - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention comprises a hose clamp enclosing a hose portion and a retaining ring enclosing the hose portion and tightly secured on the hose portion, the retaining ring being made of an elastic material. And a fixing device for a hose part made mainly of a soft elastomeric material, which is pressed into a pipe part.

[0002]

2. Description of the Related Art A device of this type is DE (German patent).
Known from No. 3543717A-1 (FIG. 3d).
In this known device, the retaining ring is a hose clamp, a so-called "elastic band clamp", which is actually a rubber jacket ring which surrounds its entire circumference, which is prevulcanized.
ert) or adhesive. The jacket ring secures the hose clamp in place on the hose in a pre-installed position. Therefore, the hose is shipped with a pre-installed hose clamp,
Then, it can be easily attached by using a robot on a bushing having a holding rib on the periphery. The hose clamp then maintains its position unchanged during transport and during pushing into the bushing.

Hose materials, usually made of EPDM or silicone rubber, which are often reinforced with textile layers or fibers, have many advantageous properties, such as high heat resistance and high ozone resistance, which are particularly desirable for automobile manufacturing. However, at temperatures below freezing, it contracts severely, so
It loses its rubber elasticity and the connection between the hose and bushing becomes non-hermetic, even though the elastic band clamp can compensate for most of the shrinkage of this hose material. Furthermore, the known hose materials suffer damage and permanent deformation under the clamping pressure of the hose clamps after a long period of time, so that the connection between the hose and the pipe eventually becomes airtight for this reason as well. have. The elastic band clamp in this case compensates for some of the deformation of the hose material, but it is limited.

[0004]

The object of the invention is to provide a device of the type mentioned at the outset in which the connection between the hose and the pipe is airtight over a high temperature and high pressure range. That is.

[0005]

According to the invention, this object is based on the fact that the retaining ring is arranged radially between the hose and the hose clamp and is made of a hard elastic material. Elasticity is small in the range from room temperature to below freezing point, and its shape stability is higher than that of hose material under the tightening pressure of the hose clamp, and the retaining ring has a protrusion protruding radially outward. A hose clamp surrounds the retaining ring between the protrusions and the retaining ring has at least one radially inwardly projecting protrusion at the end of the hose. Solved by being adjacent.

In this solution, a rigid elastic retaining ring, whose material can be chosen independently of the material of the hose, takes on the task of compensating for the deformation of the hose at low temperatures and under the clamping pressure of the hose clamp. At the same time, the retaining ring, by its radial, outwardly projecting projections,
Guarantee the position of the hose clamp with respect to the hose when pre-installed. This protrusion is a push-in limit stop and at the same time determines the position of the retaining ring on the hose part. Therefore, the retaining ring is pushed until the protrusion hits the end of the hose.

[0007] Preferably, the retaining ring is further connected to the hose portion by a crimp fit.

While hitherto mainly comprised hoses such as EPDM or silicone rubber, the retaining ring preferably comprises a hard elastomeric material which can be easily manufactured into the desired shape.

The retaining ring must contain primarily polychloroprene. This material works very well with hose materials like EPDM or silicone rubber,
Meet the required requirements.

A number of radially inwardly projecting protrusions are
Axially formed at its free end, a specifically formed arm can be formed which is attached to the retaining ring. The length of these arms determines the distance of the retaining ring from the pushing end of the hose.

In this case, the radial thickness of the arm increases towards the retaining ring. Therefore, the bending strength of the arm likewise increases towards its most stressed regions.

The retaining ring then has an axially extending slit. In some cases, its elastic constant can be chosen higher than in the case of a closed retaining ring. Therefore, the retaining ring reliably follows the bending of the hose material, so that when the hose material contracts at low temperatures, a very uniform clamping pressure is applied. Similarly, the clamping force of the optionally elastic hose clamp can easily provide a reduction of the retaining ring diameter (tightening the hose clamp can easily reduce the retaining ring diameter).

A seam plate bridging the slit must be formed on the edge of the slit. This seam plate prevents the hose material from protruding through the gap forming the slit. At the same time, this seam plate gives a very even clamping pressure distribution over the circumference of the hose.

When the seam plate abuts the other edge of the slit and engages the circumferentially extending notch of the retaining ring, a step transition between the free end of the seam plate and the inside of the retaining ring is achieved. This is avoided so that a more even clamping pressure distribution is provided over the hose circumference. (This means that the seam plate does not hit the edge of the retaining ring and goes under the retaining ring to tighten the retaining ring.)

Furthermore, it is expedient if the retaining ring has, on its side facing the hose clamp, at least an outwardly curved or corrugated elastic element. This elastic element creates an elastic force under the pressure of the hose clamp, in addition to the retaining ring, and in some cases the hose clamp,
The shrinkage of the hose material is compensated when this elasticity is low.

Alternatively or alternatively, the retaining ring has, on its side facing the hose clamp, an elastic element made of a ring-shaped spring plate, which is corrugated circumferentially or axially. This elastic element has the same or similar effect as the elastic element described above.

Instead of, or in addition to, the elastic element, the retaining ring may be curved radially outwards over its entire circumference. This bending also produces elasticity due to the clamping pressure of the hose clamp.

Further, the retaining ring may have elastic ribs that extend inward in the radial direction and extend in the peripheral direction. This rib also produces an additional elastic action.

Similarly, the retaining ring may have, on its side facing the hose, an axially corrugated or radially inwardly curved ring-shaped elastic element. This elastic element also produces additional resilience.

The hose clamp is then capable of exerting or clamping a radially inwardly directed clamping force due to its self-elasticity. This self-elasticity likewise decreases somewhat at high temperatures, but creates additional resilience, especially at low temperatures. On the other hand, the tightenable hose clamp does not change its diameter, so that the hose clamp is much higher than that of the elastic hose clamp (elastic band clamp), especially for expanded hose and retaining ring materials at high temperatures. Apply tightening force.

The invention and its improvements are explained in more detail below with reference to the drawings of a preferred embodiment.

[0022]

1 and 2, an end portion 2 and
A hose 1 having a retaining ring 3 pre-mounted on its end 2 and surrounded by a hose clamp 4, has a radius which serves as a push-down limit stop for the hose 1 and the retaining ring 3. Through the retaining ribs 5 on the end 6 of the pipe 7 with the projection 8 in the direction, until it hits the projection 8. If the pipe 7 is a pipe fitting pipe, for example, a connection fitting pipe for a radiator of a power vehicle, the protruding portion 8 is unnecessary. Alternatively, the radiator wall can be used as a push limit stop.

The hose 1 is made of EPDM (ethylene-propylene tripolymer) or silicone rubber and can be reinforced with a fabric or fibers such as aramid fibers. In motorized vehicles, the hose can be used as cooling water or a smoke hose.

The retaining ring 3 has outwardly projecting projections 9 in the form of peripheral ribs or flanges between which the hose clamp 4 is arranged, on its side, approximately adjacent to the projections 9. There is. On the side of the free end of the hose 1 a cylindrical extension 10 is formed in the retaining ring 3, which extension 10 also has a peripheral projection 11 in the form of a flange which projects radially inward. Has been formed. This protrusion 11
Is adjacent to the end of the hose 1 and in this way
It acts as a push limit stop for the retaining ring 3 so that the hose clamp 4 is arranged at a distance from the free end of the hose 1. The retaining ring 3 is mainly made of a hard elastomer material, preferably polychloroprene, as compared to the main soft elastomer material of the hose 1. The elasticity of the material of the retaining ring 3 ranges from below room temperature of at least about 20 ° C. to a freezing point well below, ie about −3.
Less than the elasticity of the hose material at temperatures up to 0 ° C. On the other hand, the shape stability under the tightening pressure of the hose clamp 4 in the entire operating temperature range is higher than the shape stability of the hose material. That is, the material of the retaining ring 3 is
At the required clamping pressure of the hose clamp 4, it does not tend to "creep" and is very elastic even at temperatures below freezing, while the hose material has already lost its elasticity, but at least Only the hose clamp 4 is able to contract, even when it still tightens the hose 1, until the clamping pressure required for the sealing connection between the hose 1 and the pipe 7 can no longer be applied.

The hose clamp 4 is made of a spring rope band which has a corrugated portion 12 near a hook 13 formed at one end of the spring rope, which hook 13 serves to tighten the hose clamp 4. , In the form of a further corrugation, engages a hook 14 formed at the other end of the spring rope. The retaining ring 3 is tightly bonded to the hose 1, for example by gluing or prevulcanization. Further, the retaining ring 3 can be crimp-fitted to the hose, for example, by forming the retaining ring 3 to have an inner diameter smaller than the outer diameter of the hose 1 before being pushed into the end portion 6 of the pipe 7. In this way, the hose clamp 4 is held in the desired mounting position at any time, especially when transporting the hose 1 with the retaining ring 3 pre-mounted, and is mounted on it and is not yet tightened. Are retained until and after final mounting on the end 6 of the pipe 7. When the ambient temperature drops, in particular below freezing, the material of the hose 1 contracts radially around the end 6 of the pipe 7, resulting in a smaller outer diameter, which weakens its elasticity and so does the retaining ring 3. Reduce the inner diameter. Moreover, even with its invariable slight elasticity, that is, due to its large rigidity, it is reduced. In that case, the material of the retaining ring 3 expands radially, inwardly, and the hose 1
Since the hose clamp 4 cannot always protrude outward, the hose 1 is elastically bonded to the end 6 of the pipe 7. Further, the corrugated portions 12 strongly attract each other, and the elasticity of the hose clamp 4 generated by the corrugated portions 12 generates a stronger pressing force.

The embodiment according to FIG. 3 differs from the embodiment of FIGS. 1 and 2 only in that the retaining ring 3a has a slit 15 which extends axially therethrough. This slit 15 is formed at the edge of the slit 15 and is elastically inward in the substantially radial direction and on the side of the projection 11 in the axial direction, and at this edge, the lower side of the retaining ring. Is bridged by a seam plate (Lashe) 16 aligned with the above, and prevents the material of the hose 1 in the tightened state from protruding outward through the slit 15 and being pinched. The seam plate 16 serves to provide a clamping pressure evenly distributed around the hose 1 when the hose clamp 4 is closed.

In the retaining ring 3b according to FIG. 4, the cylindrical extension 10 is interrupted many times in the circumferential direction, so that the extension forms an arm 17 and the free end of the arm is in each circumferential direction. Only the retaining ring according to FIGS. 1 and 2 differs from the retaining ring according to FIGS. This results in material savings compared to the retaining ring 3.

In the embodiment according to FIG. 5, as compared with the embodiment according to FIG. 4, the protrusion 9 is interrupted many times in the peripheral direction, so that an appropriate short protrusion 9a can be formed in the peripheral direction. Therefore, the material savings are even greater.

The embodiment according to FIG. 6 differs from the embodiment according to FIG. 4 in that the radial thickness of the arm 17a increases towards the retaining ring 3c. Therefore, in some cases, its bending strength towards areas of high bending load is increased. The retaining ring 3c was provided with corrugated slits in the peripheral direction and through slits in the axial direction. That is, the C-shaped elastic element 18
Surrounded by and around which is attached a tightenable hose clamp. The elastic element 18 is further
Spring elasticity compensation of deformation of the hose 1 at low temperature is performed.

FIG. 7 shows such a tightenable hose clamp 4a in the form of a worm gear type clamp, such as may be used with the device of FIG. The retaining ring 3c is provided with an axial rib 19 on the outer side in the radial direction of the arm 17b in the radial direction, and the thickness increases in the direction of the retaining ring 3c. Is different from the retaining ring according to FIG.

In the device according to FIG. 8, the extension 10 having the projections 11, 11a or the holding arms 17, 17a is
Only what is omitted in the retaining ring 3d is FIG.
Unlike the device according to 2, 4, 6 and 7. The retaining ring therefore requires less material and is easy to manufacture. On the other hand, the structure having the extension portion 10 including the stoppers 11 and 11a or the arms 17, 17a and 17b is
The retaining ring and hose clamps have a specified distance from the hose end and therefore accidentally approach the hose end,
In some cases, the retaining ring and hose clamp have the advantage that they do not slip out of the hose because they are not mounted over the end of the hose. The retaining ring thus advantageously comprises an arm 17c according to FIG. This arm is omitted in FIG. 8 for simplicity of the drawing. Therefore, the retaining ring 3d
Can be provided with a hose clamp 4 or 4a and an elastic element 18, similar to the device of FIGS. 1, 2, 6 and 7.

The devices according to FIGS. 9 and 10 differ from the device according to FIG. 7 only in that they have another hose clamp 4b and also a so-called elastic band clamp (metal). This device, in the pre-installed state shown,
Open end 2 and its radially projecting end 2
This state is held by the clamp 22 that engages with 0 and 21. At a position 23 approximately diametrical to the clamp 22, the hose clamp 4b band is cured, for example by gluing or prevulcanization, optionally with the intervention of an adhesive medium during prevulcanization.
It is closely attached to the retaining ring 3c.

Such a connection can be provided between the retaining ring and the respective hose clamp in the embodiment described above.

The device according to FIG. 11 simply consists of a retaining ring 3
8 differs from the device according to FIG. 8 in that the projection 11a of e is flush with the projection 9. Also in this example, the material of the extension 10 or the arms 17, 17a, 17b is saved.

The device according to FIG. 12 simply consists of a retaining ring 3
11 differs from the device according to FIG. 11 in that, as in the case of the retaining ring 3a according to FIG. 3, f has a slit 15 with a seam plate 16 bridging the slit 15. This seam plate 16 engages a circumferentially extending notch 24 in the form of a slit on the other edge of the slit 15.
In the closed state of the retaining ring 3f, the tightening pressure is thus evenly distributed around the hose despite the interruption by the slit 15, so that the radial inside of the seam plate 16 and the radius of the retaining ring 3f. A stepless transition between inward and outward is guaranteed.

The device according to FIGS. 13 and 14 simply comprises, between the projections 9, the retaining ring 3g comprising corrugations extending over the entire circumference made of the elastic element 18a, the cross section of which is shown. Has a substantially circular shape and the retaining ring 3g
It is different from the device according to FIG. 11 in that it is formed integrally with. This elastic element 18a has a similar function to the elastic element 18 according to FIG. The pressure of the hose clamp allows the hose clamp to elastically tuck in the corrugated valleys between the elastic elements 18a in the circumferential direction. As in the elastic element 18 according to FIG. 6, a separate formation and attachment of elastic elements is not necessary in this case.

The device according to FIG. 15 is formed in the same way as the device according to FIG. 6, but the retaining ring--similar to the previous embodiment--.
Integral with the corrugations 18b, but with a generally serrated or triangular cross section.

In the device shown in FIGS. 16 and 17, the elastic element 18c has a simple, radially outwardly curved leaf spring 1.
8c only differs from the device according to FIG. The leaf spring 18c extends in the circumferential direction of the retaining ring 3c and has one end connected to the retaining ring 3c by bonding or pre-vulcanization. The connection position is indicated by 25. The elastic element 18c can therefore elastically extend towards its free end by the clamping pressure of a hose clamp (not shown).

The device according to FIG. 18 simply comprises elastic elements 18
16 and 17 differs from the device according to FIGS. 16 and 17 in that one end of d is fixedly attached to the retaining ring 3c by form-engagement rather than intimate contact. For this purpose, the projection 9 is provided with a radial notch 26 in which a laterally projecting projection 27 is engaged at one end of the elastic element 18d.

Spring elements 18, 18c made of metal
However, 18d may also be made of plastic.

The device according to FIGS. 19 and 20 comprises an elastic element 1.
It differs from the device according to FIG. 18 in that 8e is formed integrally with the retaining ring 3i in the form of a radially outwardly curved projection.

The device according to FIGS. 21 and 22 is, on the one hand,
The arm 17c provided with the stopper 11a is attached to the protrusion 9
It is fixed by form engagement such that it is engaged by a hook 28 formed at its end, and on the other hand, the retaining ring 3j is enlarged cross section XXII-X in FIG.
As indicated by XII, it is curved radially outwardly between the side projections 9 over its entire circumference, and the seam plate 1
6a is likewise radially outwardly curved, and a notch 2 formed underneath by the curvature of the retaining ring 3j
The engagement with 9 differs from the device according to FIG. The retaining ring 3j is therefore elastically extendable axially in its curved region by the clamping pressure of a hose clamp (not shown), so that the retaining ring 3j has the same radial direction as in the previous embodiment. At thickness, it allows for large radial elastic displacements. Retaining ring 3j primarily comprises a hard elastomeric material, as in the previously described embodiments. However, the retaining ring 3j
Can be made of metal, for example spring rope.

The retaining ring 3k according to FIG.
21 corresponds to the retaining ring according to FIG. 1 except that it is curved radially outwardly, like the retaining ring 3j according to FIGS. 21 and 22.

The retaining ring 3l according to FIG. 24 is also curved radially outward on its radial outside,
It corresponds to the retaining ring according to FIG. 1 except that it has a ring groove 30 inside it, in which a ring-shaped elastic element 31 in the form of an O-ring is arranged. This elastic element 31, together with the retaining ring 31, compensates for the deformation of the hose material at low temperatures.

The retaining ring 3m according to FIG. 25 is formed in the same way as the retaining ring 3k according to FIG. 23, but in its recess 29 a ring-shaped spring made of an elastomeric material with a lenticular cross section. (Elastic) element 32
24, whose spring (elastic) element 32 performs the same function as the elastic element 31 of FIG.

26, except that the retaining ring 3n according to FIG. 26 also has, on its inside, two elastic elements in the form of ribs which are integrally formed with the retaining ring 3n on the periphery.
It corresponds to the retaining ring 3 according to FIG. These also serve the same purpose as the spring (elastic) elements 31 and 32 of FIGS. 24 and 25.

According to FIG. 27, the retaining ring 3n is shown in FIG.
Compared to 6, it further comprises a ring-shaped elastic element 34, which is snugly inserted between the elastic elements 33 and is made of an elastomeric material.

The retaining ring 3p according to FIG. 28 differs from the retaining device according to FIG. 26 in that instead of the two rib-shaped peripheral elastic elements, a plurality of elastic elements 33 are provided inside.

The retaining ring 3 according to FIG. 29 has, on its radial inside, an elastic element 35 of axially selected ring shape, made of an elastomeric material, glued or prevulcanized. Different from the retaining ring according to 28. This elastic element 35 has the same function as the elastic element of FIG.

The retaining ring 3q shown in FIG. 30 has a peripheral notch (recess) 29a formed inside thereof.
Corresponding to the retaining ring 3 according to FIG. 1 with the exception that it has a radially inwardly curved, leaf-shaped elastic element 36 made of a leaf spring, in particular a metal sheet, in the radial direction. . In the released state, this elastic element 36 has a smaller axial width than the notch (recess) 29a, so that it can elastically stretch in the axial direction when subjected to clamping pressure. it can.

The holding ring 3 according to FIG. 31 corresponds to the holding ring 3 according to FIG. 1, but on its outer side between the projections 9 is a ring-shaped, axially corrugated thin plate, in particular a metal plate. It comprises a ring-shaped elastic element 37 made.
Since the width in the axial direction is smaller than the interval between the protrusions 9 in the axial direction, it can extend in the axial direction like the elastic element 36 when subjected to the tightening pressure of the hose clamp.

Still other modifications (modifications) are possible.
The retaining ring, shown closed, is therefore also axially open by means of the slit 15 therethrough and thus open.
It can also be formed. Conversely, it is also possible to form the retaining rings 3a, 3f and 3j closed. However, the closed retaining ring must have predominantly a hard elastomeric material such as polychloroprene. In any case, the individual configurations of the retaining ring can be exchanged or combined. Different hose clamps than shown can be used as well.

[Brief description of the drawings]

FIG. 1 shows a perspective view of a device according to the invention consisting of a retaining ring and a hose clamp, which is fixed to the end of a bushing by the end of a hose.

FIG. 2 shows a II-II cross section of FIG.

FIG. 3 shows a perspective view of a hose with a modified retaining ring. In this case, the hose clamps are omitted for the sake of simplicity of the drawing.

FIG. 4 shows a perspective view of a hose with yet another modified retaining ring. In this case, the hose clamps are omitted for the sake of simplicity of the drawing.

FIG. 5 shows a perspective view of a hose with yet another modified retaining ring.

FIG. 6 shows a perspective view of a hose with a further modified retaining ring and an axially penetrating slit surrounding this retaining ring or with a C-shaped elastic element. ing. In this case, the hose clamps are omitted for the sake of simplicity of the drawing.

FIG. 7 shows a perspective view of a hose with a modified retaining ring and a hose clamp surrounding the retaining ring.

FIG. 8 shows a perspective view of a hose with yet another modified retaining ring. In this case, the hose clamps are omitted for the sake of simplicity of the drawing.

9 shows a perspective view of a hose with a retaining ring according to FIG. 7, but with another retaining clamp.

FIG. 10 shows a cross section taken along line XX of FIG.

FIG. 11 shows a perspective view of a hose with yet another modified retaining ring. In this case, the hose clamps are omitted for the sake of simplicity of the drawing.

FIG. 12 shows a perspective view of a hose with yet another modified retaining ring. In this case, the hose clamp
It has been omitted for simplicity of illustration.

FIG. 13 shows a perspective view of a hose with yet another modified retaining ring. In this case, the hose clamp
It has been omitted for simplicity of illustration.

FIG. 14 shows a section XIV-XIV in FIG.

FIG. 15 shows a perspective view of a hose with yet another modified retaining ring. In this case, the hose clamp
It has been omitted for simplicity of illustration.

FIG. 16 shows a perspective view of a hose with yet another modified retaining ring. In this case, the hose clamp
It has been omitted for simplicity of illustration.

FIG. 17 shows a cross section taken along line XVII-XVII of FIG. 16.

FIG. 18 shows a perspective view of a hose with yet another modified retaining ring. In this case, the hose clamp
It has been omitted for simplicity of illustration.

FIG. 19 shows a perspective view of a hose with yet another modified retaining ring. In this case, the hose clamp
It has been omitted for simplicity of illustration.

20 shows a section XX-XX in FIG.

FIG. 21 shows a perspective view of a hose with yet another modified retaining ring. In this case, the hose clamp
It has been omitted for simplicity of illustration.

FIG. 22 XXI of FIG. 21 on a magnified scale without a hose
The I-XXII cross section is shown.

FIG. 23, partially with additional elastic elements, FIG.
Figure 4 shows a cross-sectional view of yet another modified retaining ring corresponding to the cross section of 2;

FIG. 24, partially with additional elastic elements, FIG.
Figure 4 shows a cross-sectional view of yet another modified retaining ring corresponding to the cross section of 2;

FIG. 25, partially with additional elastic elements, FIG.
Figure 4 shows a cross-sectional view of yet another modified retaining ring corresponding to the cross section of 2;

FIG. 26, partially with additional elastic elements, FIG.
Figure 4 shows a cross-sectional view of yet another modified retaining ring corresponding to the cross section of 2;

FIG. 27, partially with additional elastic elements, FIG.
Figure 4 shows a cross-sectional view of yet another modified retaining ring corresponding to the cross section of 2;

FIG. 28, partially with additional elastic elements, FIG.
Figure 4 shows a cross-sectional view of yet another modified retaining ring corresponding to the cross section of 2;

FIG. 29, partially with additional elastic elements, FIG.
Figure 4 shows a cross-sectional view of yet another modified retaining ring corresponding to the cross section of 2;

FIG. 30 FIG. 2 partially with additional elastic elements
Figure 4 shows a cross-sectional view of yet another modified retaining ring corresponding to the cross section of 2;

FIG. 31 partly with additional elastic elements, FIG.
Figure 4 shows a cross-sectional view of yet another modified retaining ring corresponding to the cross section of 2;

[Explanation of symbols]

 1 Hose 3 Retaining Ring 4 Hose Clamp 5 Retaining Rib 7 Pipe 9 Protrusion 11 Protrusion 12 Waveform 13 Hook 15 Slit

Claims (1)

(57) [Claims] 1. A hose clamp (4; 4a; 4b) surrounding a hose portion (2) and a hose portion (2), made of an elastic material, tightly fixed on the hose portion (2). Retaining ring (3; 3a-3q) and a holding device (3; 3a-3q) for holding a hose portion (2) mainly made of a soft elastomer material, which is pressed into a pipe portion (6). 3q) is arranged radially between the hose (1) and the hose clamp (4; 4a; 4b) and is made of a hard elastomeric material, the elasticity of which ranges from room temperature to below freezing. And its shape stability when subjected to the clamping pressure of the hose clamps (4; 4a; 4b) is higher than that of the hose material and the retaining rings (3; 3a-3q) are Projections projecting; have (9 9a),
Between the protrusions (9; 9a), a hose clamp (4; 4a; 4b) surrounds the retaining ring (3; 3a-3q) and the retaining ring (3; 3a-3c; 3e).
~ 3q) has at least one protrusion (11; 11a) protruding inward in the radial direction, and the protrusion (11; 1a).
1a) is adjacent to the end of the hose (1).