KR100228291B1 - Fixing device for hose section pushed into pipe section - Google Patents

Abstract

A clamping device for a hose end 2 made of a predominantly soft elastomeric material which is forcibly pushed into the pipe part 6 has a hose clamp 4 and a hose end 2 surrounding the hose end 2, And a locking ring 3 made of an elastic material, which is fixed to the end portion of the hose. The locking ring 3 is arranged radially between the hose 1 and the hose clamp 4 so as to ensure the airtightness between the hose 1 and the pipe 7 over a high temperature and high pressure range. The elasticity of which is smaller than the elasticity of the hose material in the range from room temperature to far below the freezing point and the shape stability of the elastic material is less than that of the hose clamp 4, Characterized in that the locking ring (3) has a protrusion (9) which is higher than the shape stability of the hose material under the clamping pressure and protrudes radially outwardly, and between which the hose clamp (4) surrounds the locking ring .

Description

Fastening device of end of hose pushed into pipe part

The present invention relates to a hose clamp comprising a hose clamp surrounding a hose end and a locking ring made of a resilient material surrounding the hose end and secured to the hose end, To a fastening device for a hose end made of an elastomeric material.

A device of this type is already known from DE 35 43 717 A1 (FIG. 3). In such a known device, the locking ring is a hose clamp, a so-called "elastic band clip ", which is actually a jacket ring of rubber material covering the entire circumference of the hose clamp, . This jacketing fixes the hose clamp at a predetermined predetermined position on the hose. Thus, the hose can be transported with a preassembled hose clamp and can be easily assembled using a robot on a bushing having a surrounding supporting rib, wherein the hose clamp can move its position It keeps almost unchanged when it is forcibly pushed into the bushing as well.

Hose materials, which are often made of EPDM or silicone rubber, reinforced with fabric layers or fibers, have a number of advantageous properties, especially those required in automotive manufacturing, such as high heat resistance and high ozone resistance, but at temperatures below the freezing point Since it is severely contracted, it almost completely disrupts the elasticity of the rubber, and the connection between the hose and the bushing loses airtightness, even though the elastic band clip can compensate for most of this shrinkage of the hose material. In addition, since the known hose material is worn out and deformed for a long time under the tightening pressure of the hose clamp, the hose is permanently deformed, so that the connection between the hose and the pipe has the drawback that it eventually loses airtightness. Elastic band clips compensate for some of the deformation of the hose material in this case, but there are also limitations.

It is an object of the present invention to provide a device of the type mentioned in the opening paragraph in which the connection between the hose and the pipe maintains airtightness over a higher temperature range and a higher pressure range.

According to the invention, this object is achieved in that the locking ring is arranged radially between the hose and the hose clamp and is made of a hard elastic material, the elasticity of the elastic material being in the range from room temperature to far below the freezing point, And the stability of the elastic material is higher than the shape stability of the hose material under the clamping pressure of the hose clamp and the locking ring has a protrusion protruding radially outwardly and between the protrusions The hose clamp surrounds the locking ring and has at least one protrusion protruding radially inwardly from the locking ring, the protrusion being resolved adjacent to the end of the hose.

In this solution, a rigid elastic locking ring, capable of selecting the material regardless of the material of the hose, is tasked to compensate for the deformation of the hose under the tightening pressure of the cold and hose clamps. At the same time, the locking ring ensures the position of the hose clamp relative to the hose in a pre-assembled state, by projections projecting radially outwardly. This protrusion is a push restricting stopper and at the same time determines the position of the locking ring on the hose end. Therefore, the locking ring is pushed into the hose until the projection abuts against the end of the hose.

The locking ring is preferably connected to the hose end portion in a press fit manner.

Up to now, the hose mainly contains EPDM or silicone rubber, but it is preferable that the locking ring has a hard elastomeric material which can be easily formed into a desired shape.

The locking ring should mainly contain polychloroprene. This material combines with hose materials such as EPDM or silicone rubber to meet the requirements very well.

A plurality of projections projecting inward in the radial direction can form an especially shaped arm in which the locking ring is provided axially on the free end. The length of this arm determines the distance of the locking ring from the pushed end of the hose.

In this case, the radial thickness of the arm increases in the direction of the locking ring. Thus, the bending strength of the arm likewise increases in the direction of its highest stressed area.

Further, the locking ring has a slit communicating in the axial direction. In some cases, the spring rate of the locking ring can be chosen to be greater than in the case of a closed locking ring, so that the locking ring follows the bending of the hose material more reliably, Even if the hose material shrinks, a very uniform fastening pressure is applied. Likewise, in some cases, the fastening force of the resilient hose clamp can easily lead to a reduction in the diameter of the locking ring (by simply tightening the hose clamp, the diameter of the locking ring can be reduced).

At the edge of the slit, a bracket connecting the slit should be formed. This bracket prevents the hose material from coming out from the gap forming the slit. At the same time, this bracket ensures a very uniform distribution of clamping pressure over the circumference of the hose.

When the bracket abuts against the other edge of the slit and engages the notch extending in the circumferential direction of the locking ring, a stepped transition between the free end of the bracket and the inside of the locking ring is prevented, Distribution is made.

It is also advantageous if the locking ring has at least one resilient element curved or corrugated outwardly towards its hose clamp. This elastic element generates additional elasticity to the locking ring by the pressure of the hose clamp and, in some cases, to the hose clamp, and this elasticity is responsible for the shrinkage compensation of the hose material at low temperatures as well.

Alternatively, the locking ring has an elastic element made of a spring steel plate in the shape of a ring shaped in the circumferential direction or in the axial direction on the side facing the hose clamp. Such an elastic element has the same or similar effect as the elastic element described above.

Instead of, or in addition to, an elastic element, the locking ring may be curved radially outwardly over its entire circumference. These curvatures also generate elasticity under the clamping pressure of the hose clamp.

The locking ring also protrudes radially inwardly and may have elastic ribs extending in the circumferential direction. These ribs also generate additional elasticity.

Likewise, the locking ring may have a ring-shaped elastic element curved in the axial direction or in the radially inward direction on its side facing the hose. These elastic elements also generate additional elasticity.

Further, the hose clamp is capable of applying a tensile force toward the radially inward direction or being fastened by its own elasticity. The elasticity of itself also decreases somewhat at high temperatures, but generates additional elasticity, especially at low temperatures. On the other hand, the fastening hose clamp does not change its diameter, and gives a significantly higher fastening force than in the case of an elastic hose clamp (elastic band clip) particularly in the case of a hose material and a locking ring material that have expanded at high temperatures .

The present invention and its improvements are described in detail in the following preferred embodiments with reference to the drawings.

FIG. 1 is a perspective view of a device according to the invention, consisting of a locking ring and a hose clamp, with the end portion of the hose being secured to the end of the bushing via a hose clamp.

2 is a cross-sectional view taken along line II-II in FIG. 1;

Figure 3 is a perspective view of a hose having a modified locking ring, in which case hose clamps are omitted for simplification of the drawing.

FIG. 4 is a perspective view of a hose having another modified locking ring, in which case hose clamps are omitted for simplification of the drawing.

FIG. 5 is a perspective view of a hose having another modified locking ring. FIG.

FIG. 6 is a perspective view of a hose with another modified locking ring having an axially-passing slit surrounding the locking ring or having a C-shaped resilient element, in which case hose clamps are omitted for simplification of the drawing .

FIG. 7 is a perspective view of another modified locking ring and a hose having a hose clamp surrounding the locking ring; FIG.

FIG. 8 is a perspective view of a hose having a further modified locking ring, in which case hose clamps are omitted for simplification of the drawing.

FIG. 9 is a perspective view of a hose having a locking ring according to FIG. 7 but having another hose clamp; FIG.

10 is a cross-sectional view taken along line X-X in FIG. 9;

FIG. 11 is a perspective view of a hose having another modified locking ring, in which case hose clamps are omitted for simplification of the drawing.

FIG. 12 is a perspective view of a hose having another modified locking ring, in which case hose clamps are omitted for simplification of the drawing.

FIG. 13 is a perspective view of a hose having another modified locking ring, in which case the hose clamp is omitted for simplification of the drawing; FIG.

14 is a cross-sectional view taken along line XIV-XIV in FIG.

FIG. 15 is a perspective view of a hose having another modified locking ring, in which case the hose clamp is omitted for simplification of the drawing.

FIG. 16 is a perspective view of a hose having another modified locking ring, in which case hose clamps are omitted for simplification of the drawing.

17 is a cross-sectional view taken along line XVI-XVII in FIG. 16;

FIG. 18 is a perspective view of a hose having another modified locking ring, in which case the hose clamp is omitted for simplification of the drawing.

FIG. 19 is a perspective view of a hose having another modified locking ring, in which case hose clamps are omitted for simplification of the drawing.

20 is a cross-sectional view taken along line XX-XX of FIG. 19;

FIG. 21 is a perspective view of a hose having another modified locking ring, in which case the hose clamp is omitted for simplification of the drawing; FIG.

FIG. 22 is a cross-sectional view taken along line XXII-XXII in FIG. 21 on an enlarged scale, with the hose omitted.

Figures 23 to 31 are cross-sectional views of other modified locking rings corresponding to the cross-section of Figure 22, with partially additional elastic elements.

According to the first and second figures the hose 1 which has been previously assembled on the end portion 2 and on the end portion 2 thereof and which has the locking ring 3 surrounded by the hose clamp 4, (8) of the pipe (7) acting as a push restricting stopper for the hose (1) and the locking ring (3) through the holding ribs (5) of the end portion (6) ).

If the pipe 7 is a pipe connection pipe such as, for example, a connecting branch of an automobile cooler, the protrusion 8 is unnecessary. Instead, the wall of the cooler can serve as a push restricting stopper.

The hose 1 is made of EPDM (ethylene-propylene-3 polymer) or silicone rubber and can be reinforced through a fabric or fiber, such as an aramid fiber. The hose may be used as a cooling water hose or a heating hose in an automobile.

The locking ring 3 has a protruding portion 9 protruding radially outwardly from the periphery of the rib or flange and a hose clamp 4 interposed therebetween in such a manner that the side is arranged substantially adjacent to the projection 9 have. A cylindrical extension 10 is formed in the locking ring 3 at the free end of the hose 1. A flange-shaped peripheral protrusion 11 protruding radially inward also extends to the extension 10, Respectively. This protrusion 11 is adjacent to the end of the hose 1 and in this way the hose clamp 4 is arranged at a predetermined distance from the free end of the hose 1, Lt; / RTI > The locking ring 3 is made mainly of a rigid elastomeric material, preferably polychloroprene, as compared to the predominantly flexible elastomeric material of the hose 1. The elasticity of the locking ring 3 material is less than the elasticity of the hose material at temperatures from room temperature of at least about 20 캜 to well below freezing, i.e., about -30 캜. On the other hand, the shape stability under the clamping pressure of the hose clamp 4 is higher than the shape stability of the hose material in the entire use temperature range. In other words, the material of the locking ring 3 does not tend to "creep" under the essential clamping pressure of the hose clamp 4 and is very elastic even at temperatures below the freezing point, while the hose material, But at least the hose clamp 4 is not sufficiently tight enough to allow the tightening pressure required for the sealing connection between the hose 1 and the pipe 7 to be no longer applied even if it still tightens the hose 1 Can be contracted.

The hose clamp 4 is made of a spring steel band having an undulation 12 in the vicinity of the hook 13 formed at one end of the spring steel band which is used to fasten the hose clamp 4 And hooks 14 formed in the form of another corrugated portion at the other end of the spring steel band. The locking ring 3 is tightly coupled to the hose 1, for example, by adhesion or vulcanization. The locking ring 3 can be press-fitted to the hose by forming the inner diameter of the locking ring 3 smaller than the outer diameter of the hose 1 before pushing the inner diameter of the locking ring 3 to the distal end portion of the pipe 7, for example. In this way the hose clamp 4 is held at the desired assembly position at any time, in particular for the transport of the hose 1 with the pre-assembled locking ring 3, The hose clamp 4 is also held until it is finally assembled on the end portion 6 of the pipe 7 and thereafter. The material of the hose 1 shrinks around the end portion 6 of the pipe 7 so that the outer diameter becomes smaller and its elasticity weakens and the locking ring 3 ) Also decreases in its inner diameter. Nonetheless, even with its invariable minute elasticity, it is reduced by large stiffness. The material of the locking ring 3 expands radially inwardly and the hose 1 can not always be discharged outwardly due to the hose clamp 4 so that the end portion 6 of the pipe 7 The hose 1 is elastically bonded. Further, the corrugated portion 12 is attracted strongly to each other, and the elasticity of the hose clamp 4 generated by the corrugated portion 12 generates a stronger compressive force.

The embodiment according to FIG. 3 differs from the embodiment of FIGS. 1 and 2 only in that the locking ring 3a has a slit 15 penetrating in the axial direction, Is formed at the edge of the slit 15 and is resilient inwardly in the substantially radial direction and axially inwardly at the projection 11 and connected at its edge via a bracket 16 which is joined to the underside of the locking ring And prevents the material of the hose 1 from being pushed outwardly through the slit 15 in the tightened state to prevent it from being caught. Thus, the bracket 16 acts to impart a generally evenly distributed clamping pressure over the circumference of the hose 1 when the hose clamp 4 is closed.

The locking ring 3b according to FIG. 4 differs from the locking ring of FIGS. 1 and 2 in that the cylindrical extension 10 is interrupted several times in the circumferential direction so that the extension thereof forms the arm 17 And a protruding portion 11a is formed at the free end portion of the arm so as to be appropriately thinned in the circumferential direction. This results in a reduction of material compared to the locking ring 3.

In the embodiment according to FIG. 5, as compared with the embodiment according to FIG. 4, since the projections 9 are stopped several times in the circumferential direction, appropriately shorter protrusions 9a are formed in the circumferential direction, .

The embodiment according to FIG. 6 differs from the embodiment of FIG. 4 in that the radial thickness of the arm 17a increases toward the locking ring 3c. Accordingly, the bending strength of the arm in the direction of the large bending load region increases, as the case may be. The locking ring 3c has a slit continuing in a circumferential direction of the corrugated shape. In other words, a hose clamp is formed which is surrounded by the C-shaped resilient element 18 and fastenable around it. The elastic element 18 also compensates for spring elasticity of deformation of the hose 1 at low temperatures.

Figure 7 shows a clampable hose clamp 4a of a worm gear type clamp, such as may be applied to an apparatus according to Figure 6. The locking ring 3c differs from the locking ring of FIG. 6 in that the thickness of the arm 17b in the radial direction has a rib 19 in the axial direction radially outwardly thereof, And increases toward the locking ring 3c by increasing in the direction of the locking ring 3c.

The apparatus according to FIG. 8 differs from the apparatus of FIGS. 1, 2, 4, 6 and 7 in that the extension 10 or the pawl arm 17 and 17a are omitted from the locking ring 3d. Thus, the locking ring requires less material and can be manufactured simply. On the other hand, in the structure having the extension portion 10 or the arms 17, 17a, 17b including the stoppers 11, 11a, the locking ring and the hose clamp have an interval determined from the hose end, The hose end approaches the end of the hose and, in some cases, is not assembled while overlapping the end of the hose, so that the locking ring and the hose clamp do not slip out from the hose. Accordingly, it is advantageous for the locking ring to have an arm 17c according to FIG. These arms are omitted in FIG. 8 for the sake of simplicity. The locking ring 3d can thus be equipped with a hose clamp 4 or 4a and an elastic element 18 as in the device according to the first, second, sixth and seventh figures.

The device according to FIGS. 9 and 10 differs from the device of FIG. 7 in that the device has another hose clamp 4b and also has a so-called elastic band clip (metal material). The spring band clip is open in the pre-assembled state shown and is held in this position by a clamp 22 engaging its radially projecting end portions 20,21. The band of the hose clamp 4b at the position 23 in the approximate radial direction with respect to the clamp 22 is cured under the presence of an adhesive agent during the vulcanization process, for example, by adhesion or vulcanization, And is in close contact with the ring 3c.

Such engagement may be between the locking ring and the respective hose clamp in the above embodiment.

The apparatus according to FIG. 11 differs from the apparatus according to FIG. 8 only in that the projection 11a of the locking ring 3e lies in the same plane as the projection 9. Again the material of the extension 10 or the arms 17, 17a, 17b is saved.

The apparatus according to figure 12 differs from the apparatus according to figure 11 only in that the locking ring 3f has a bracket (not shown) connecting the slit 15, as in the case of the locking ring 3a according to figure 3 16 having a slit 15 formed therein. The bracket 16 engages with a circumferentially extending recess 24 in the form of a slit at the other edge of the slit 15. In this way, in the closed state of the locking ring 3f, since the tightening force is evenly distributed over the circumference of the hose despite the interruption through the slit 15, the radially inner side of the bracket 16 and the locking ring Step-wise transition is ensured between the radially inner side of the first and second flanges 3f and 3f.

13 and 14 differs from the device of FIG. 11 only in that the locking ring 3g is provided with a corrugated portion extending over the entire circumference, made of an elastic element 18a between the projections 9 And the cross section of the elastic element is substantially in the form of a circle, and is formed integrally with the locking ring 3g. This elastic element 18a has a function similar to that of the elastic element 18 according to FIG. By the pressure of the hose clamp, the hose clamp can be elastically clamped in the circumferential direction with a hollow of waves between the elastic elements 18a. As with the elastic element 18 according to FIG. 6, the formation and assembly of each of the elastic elements is not necessary in this case.

Although the device according to FIG. 15 is formed similarly to the device of FIG. 6, the locking ring is not necessary in this case for forming and assembling each of the elastic elements, like the corrugated part 18b, similar to the above embodiment.

The apparatus shown in FIGS. 16 and 17 differs from the apparatus according to FIG. 6 in that only the resilient element 18c is made of a simple leaf spring 18c curved radially outwardly. The leaf spring 18c extends in the circumferential direction of the locking ring 3c, and one end of the leaf spring 18c is connected to the locking ring 3c by adhesion or vulcanization. The connection position is indicated by 25. Thus, the elastic element 18c can be elastically extended in the direction of its free end by the clamping pressure of the hose clamp (not shown).

The apparatus according to FIG. 18 differs from the apparatus according to FIGS. 16 and 17 only in that one end of the resilient element 18d is fixed to the locking ring 3c by a shape engagement, It is a point. For this purpose, the projection 9 has a radial notch 26 into which a projection 27 projecting sideways is engaged at one end of the elastic element 18d.

The elastic elements 18, 18c, 18d are made of metal, but may also be made of plastic.

19 and 20 differs from the device according to FIG. 18 in that the resilient element 18e is formed in the form of a protrusion curved radially outwardly integrally with the locking ring 3i to be.

21 and 22 differs from the apparatus of FIG. 3 in that on the one hand, the arm 17c with the stopper 11a is supported by a hook 28 formed at one end thereof On the other hand, the locking ring 3j is fixed to the protruding portion 9 by the shape engagement so that the locking ring 3j is engaged with the side projection 9 as shown in the enlarged section XXII-XXII in FIG. The bracket 16a is curved radially outwardly in a similar manner and the recess 29 formed at the lower end by the curvature of the locking ring 3j is curved in the radial outward direction It is different in that it is interlocked. Therefore, the locking ring 3j is elastically stretchable in the axial direction by the tightening pressure of the hose clamp (not shown) in the curved region thereof, In the case of a thickness in the same radial direction as in the case of the first embodiment, a larger radial elastic range of spring is possible. The locking ring 3j mainly comprises a rigid elastomeric material, as in the embodiments described above. However, the locking ring 3j may be made of a metal such as, for example, a steel sheet.

The locking ring 3k according to FIG. 23 is identical to that according to FIG. 1, except that it is curved radially outwardly between the protrusions 9, like the locking ring 3j according to FIGS. Same as locking ring.

The locking ring 31 according to FIG. 24 also has a radially outwardly curved outer side in its radial direction, with a snap ring groove 30 on the inside thereof, Is the same as the locking ring according to Fig. 1, except that the resilient element 31 of Fig. This elastic element 31 together with the locking ring 31 compensates for deformation of the hose material at low temperatures.

Although the locking ring 3m according to FIG. 25 is formed similar to the locking ring 3k according to FIG. 23, a ring-like elastic element made of an elastomeric material having a lens-like cross- (32), the elastic element (32) fulfills the same function as the elastic element (31) of FIG.

The locking ring 3n according to FIG. 26 also has, on the inside thereof, a first locking element 3b, which has, in addition to the first locking element 3b, Lt; / RTI > These elements of course fulfill the same purpose as the elastic elements 31 and 32 of FIGS. 24 and 25.

According to FIG. 27, the locking ring 3n further comprises a ring-like elastic element 34 as compared to FIG. 26, said elastic element being snugly inserted between the elastic elements 33, .

The locking ring 3q according to FIG. 28 differs from the locking ring according to FIG. 26 in that it has a plurality of elastic elements 33 instead of the elastic elements in the form of two ribs.

The locking ring 3 according to FIG. 29 differs from the locking ring according to FIG. 28 in that a ring-shaped, elastomeric elastic element 35 axially selected in its radial direction is adhered or And is vulcanized. This elastic element 35 has the same function as the elastic element 33 of FIG.

The locking ring 3q according to FIG. 30 has a peripheral recess 29a formed therein, in which a leaf spring, particularly a ring-like elastic element 36 made of a metal plate, curved inward in the radial direction, Is the same as the locking ring 3 according to Fig. Since the elastic element 36 has a smaller axial width than the recess 29a in the relaxed state, the elastic element 36 can elastically extend in the axial direction under the tightening pressure.

The locking ring 3 according to FIG. 31 corresponds to the locking ring 3 of FIG. 1, but on the outer side between the projections 9 a ring-shaped thin plate of corrugated shape in the axial direction, (37). Its axial width is smaller than the axial spacing of the projections 9 and can therefore extend axially under the clamping pressure of the hose clamp, just like the elastic element 36.

Other variations are of course possible. Thus, the locking rings, which are shown in the closed state, can also be formed open by the axially penetrating slit 15. Conversely, it is also possible to form the locking rings 3a, 3f, 3j by closing them. However, the closed locking rings must have a predominantly hard elastomeric material such as polychloroprene. In any case, each configuration of the locking ring can be exchanged or combined. Other hose clamps than shown can be used as well.

The connection between the hose and the pipe takes place over a larger temperature range and pressure range.

Claims (1)

A hose clamp 4 (4a; 4b) surrounding the hose end 2, and a locking ring 3 (3a-3q) made of an elastic material which is tightly fixed to the hose end portion and surrounds the hose end 2 Characterized in that the locking ring (3) (3a-3q) is arranged in the radial direction of the hose (1) in a clamping device of a hose end (2) made of a predominantly flexible elastomeric material, Is made of a rigid elastomeric material and the elasticity of the material of the locking ring 3 (3a-3q) is between the room temperature of 20 占 폚 well below the freezing point, i. E. Is less than the elasticity of the hose material in the temperature range up to -30 占 폚 and the shape stability of the elastic material under the clamping pressure of the hose clamp (4; 4a; 4b) is higher than the shape stability of the hose material; (3a, 3a-3q) has a radially outwardly projecting projection (9; 9a), between which the hose clam Characterized in that at least one protrusion (11; 11a) in which the locking ring (3; 4a; 4b) surrounds the locking ring (3; 3a-3q) and the locking ring (3; 3a-3c; 3e- Characterized in that the projecting portion (11; 11a) is adjacent to the end of the hose (1).