DE102012109785B4 - Connecting element for connecting an inelastic tube with an elastic hose - Google Patents

Abstract

Connecting element (3) for connecting an inelastic tube (1) with an elastic tube (2), wherein the connecting element (3) has a first receptacle (30) for receiving the inelastic tube (1) and a second receptacle (32) for receiving the elastic hose (2), wherein the connecting element (3) has a first stop (33) against which the inelastic tube (1) for taking a defined position in the longitudinal direction A on the connecting element (3) can be pushed, and wherein Connecting element (3) has a second stop (13; 5) against which the elastic hose (2) can be slid onto the connecting element (3) for taking a defined position in the longitudinal direction A, characterized in that the two receptacles (30, 32) are arranged overlapping in the longitudinal direction A.

Description

The invention relates to a connecting element for connecting an inelastic tube with an elastic tube, wherein the connecting element has a first stop against which the inelastic tube can be pushed to take a defined position in the longitudinal direction A on the connecting element, and wherein the connecting element has a second stop has, against which the elastic tube for taking a defined position in the longitudinal direction A can be pushed onto the connecting element.

It has long been known and necessary to produce pressure-tight connections between elastic hoses and inelastic pipes. Under elastic hoses here hoses made of elastomeric materials or with components of elastomeric materials understood, hereinafter also called rubber hoses. Under inelastic pipes are tubes made of inelastic Materiealien or inelastic material components such. B. plastic pipes from or with z. As polyamide (PA) understood.

These compounds may, for. Example, be prepared by one end of the rubber hose pushed over one end of the plastic tube and then by means of a press ring, a clamp (eg., Federbandschelle) or the like is pressed onto the outer surface of the plastic tube. Here, the elastic portion of the rubber hose seals pressure-tight on the plastic tube.

In order to withstand the pressure of the clamp, a certain wall thickness of the plastic pipe is required, which extends for manufacturing reasons over the entire length of the pipe and thus oversized outside the connection area. This makes the plastic pipe heavier and more expensive than it would actually be required.

To overcome this disadvantage, it is customary at the end of the plastic pipe to support this from the inside by means of an inserted binding or dual-sleeve. This can absorb the radially acting forces of the compression, without the plastic pipe must be designed according to solid and solid over its entire length. The sleeves partially have a radially outwardly projecting collar so that their insertion into the end of the plastic tube in the longitudinal direction A is limited. After inserting the sleeve in the plastic tube, the collar of the sleeves from inside impresses flat on the outside of the plastic tube and thus defines the position for mounting the rubber hose. Such sleeves are usually produced as turned parts or stamped bent parts made of non-ferrous metals.

It is also common to mount rubber hoses with aluminum pipes. Due to their material thickness, even with a comparatively thin-walled embodiment, the aluminum tubes are able to absorb the pressing forces of the clamps or the like themselves, i. H. on inserted sleeves can be omitted here. To determine the connection between rubber hoses and aluminum pipes, the standard DIN 3021 was created, which describes the geometry at the end of the aluminum tube for uniform assembly. In this case, the end of the aluminum tube is compressed and thereby created a corrugated geometry of the pipe end, which acts as a connection point according to the standard DIN 3021.

A disadvantage of the aforementioned compounds for rubber hoses, that the sleeves used in plastic pipes are sharp and thereby damage the rubber hoses during coating, d. H. can scratch. This can cause tearing of the rubber hoses at the connection point, especially at high internal hose pressures. Furthermore, due to their material strength within a joint, metallic components can generally damage rubber or plastic parts.

Another disadvantage is that the rubber hoses can be pushed almost anywhere on the ends of the aluminum and plastic pipes. This allows the assembly z. B. the clamp outside of the reinforced by the sleeve portion of the plastic tube, whereby this can be pressed in excessively and thereby damaged. Also, the rubber hoses can be pushed too low, as that no secure connection could be made. In other words, the known compounds have no defined positions for the connection components. In addition, the known compounds are relatively long-lasting.

Another disadvantage is that such tubes can get marks and indentations or constrictions by Einknöpfen in a thermofixing on the surface, which can affect the tightness.

Another disadvantage is that the compression of the rubber hose by z. B. the clamp is always done on the aluminum tube or the plastic tube. This direct material contact can lead to material-specific contour deviations by the embossing process, because the stiffer material such. As aluminum or plastic forms a low figure and the softer Material such. As gum a clearer, sharper picture.

An object of the present invention is to provide a connecting element for connecting an inelastic tube with an elastic tube of the type described above, which overcomes the aforementioned disadvantages.

The object is achieved in that the two shots are arranged overlapping in the longitudinal direction A.

The invention is based on the finding that a uniform mounting geometry can be created by means of such a connecting element so that the two elements to be connected can receive a defined mounting position during assembly, ie. H. About a defined by the length of the recordings in the longitudinal direction A dimension can be pushed onto the connecting element and secured there. As a result, both the assembly of the rubber hose and the assembly of the plastic pipe is standardized and thereby overcome the disadvantages of the prior art listed disadvantages.

It is advantageous in this case that such a connection element can be realized relatively short, d. H. takes up little space during assembly. This can just for the use of such a connecting element in z. B. engine compartment of a vehicle be important because here the modules are arranged close to each other and space to be saved. Advantageously, the connecting element according to the invention can be applied to known assembly processes, which reduces the complexity and cost of the application and increases the acceptance by the user. This applies both to the pressing of the connecting element in the plastic tube and the assembly of the rubber hose z. B. by clamp or the like.

The connecting element according to the invention can be applied to all types of media-carrying lines, which must be connected to elastic hoses.

According to one aspect of the invention, the connecting element has a radial projection, which is provided to be inserted in the assembly of the elastic tube in this and which is formed rounded so that the assembly of the elastic tube facilitates and this can be mounted without damage.

The radial projection is provided in the longitudinal direction A at one end of the connecting element and so far from a radial elevation, a radial annular contour or a stop ring spaced that a radial securing element between the radial projection and the radial elevation, the radial annular contour or the Stop ring can act radially.

It is advantageous here that an elastic radial widening of the elastic tube when pushed onto the connecting element and a gripping engagement of the radial projection in the longitudinal direction A can take place by means of such a rounded element, which preferably rises in the form of a flat angle and has a round dome geometry. As a result, the radial projection can counteract a removal of the mounted hose on the connecting element. In particular, however, by the rounded geometry of the radial projection damage to the elastic tube during mounting and also by z. As edges or sharp highlighting avoided. Such can z. B. occur in conventional insertion sleeves.

It is also advantageous that by the radial projection, the visible and palpable outwardly by the deferred elastic rubber hose outwardly, an externally recognizable mark is created to in the assembly of z. B. Clamp display as a radial securing element, in which area this must be tightened to press securely through the rubber hose on the connecting element. As a result, a secure installation of this connection is guaranteed.

A further advantage is that the inelastic tube can be pushed from the opposite direction in the longitudinal direction A for mounting against the radial projection, thereby occupying its predetermined mounting position. In this way, with a corresponding radial configuration of the radial projection, a concealment of the cutting edge of the inelastic tube by the radial projection, whereby damage to the elastic tube when pushed over the edge of the previously pushed onto the connecting element inelastic tube can be avoided. Also, a defined stop for the inelastic tube can be created by the radial projection.

According to a further aspect of the invention, the first receptacle has a Verkrallungskontur for holding the deferred inelastic tube.

The advantage here is that by the Verkrallungskontur on the Außenoberfäche of the connecting element in the receiving area for the plastic pipe from the inside through the Claw elements can be kept. This means that this contour automatically secures the pushed-on plastic pipe against pulling off or slipping off and thus produces an automatically holding connection between the plastic pipe and the connecting element. For this purpose, the Verkrallungskontur has a sawtooth or fir-tree-like outer design, which does not obstruct the sliding of the plastic tube or only insignificantly, however, against a withdrawal or slipping by means of z. B. barbs, wedges or ribs acts. As a result, a simple, fast and reliable connection between the connecting element and plastic pipe is ensured.

If necessary, this connection can be strengthened or secured by additional measures. Z. b. could this connection from the outside with a clamp or the like compressed and additionally secured. Also z. As adhesives or the like can be used for this purpose. Preferably, however, this recording comes from without further means.

According to a further aspect of the present invention, the Verkrallungskontur radially expand the inelastic tube in this area such that on the outside of the inelastic tube, a radial annular contour is formed as a second stop for the elastic tube.

The advantage here is that this Verkrallungskontur can hold the deferred inelastic tube automatically and at the same time forms a radial expansion on the outer surface of the tube, which can serve as a mark of the end of the inserted connecting element as well as a stop for the aufzuschiebenden elastic tube visible and palpable. This allows the area in which a radial securing element such. B. a clamp to be mounted will be marked.

According to a further aspect of the present invention, the connecting element consists of a non-metallic material, preferably of a plastic, particularly preferably of a plastic with glass fiber content.

The advantage here is that also on the choice of materials damage to the plastic pipe and the rubber hose can be avoided, as they may occur in compounds to these metallic components, either as a connection partner (aluminum tube with rubber hose) or be it as an auxiliary element (supporting inner sleeve the plastic tube) are involved. This increases the longevity of this connection. Preferably, the connecting element according to the invention is designed as a plastic injection molded component with glass fiber content.

The present invention further relates to a connection system with a connecting element as described above and a stop ring, which is intended to be resiliently pushed by the inelastic tube in the longitudinal direction A over the radial annular contour and to block movement against the thrust direction and a second stop for to form the elastic tube.

The advantage here is that a defined and me striking attack can be created by such a stop ring, as it would not be so well alone by protruding from the inside through the inelastic tube elements. Thus, the stopper is designed as a separate body such that a larger area contact surface in the longitudinal direction A is provided, against which the elastic tube can be pushed during assembly, as would be possible by inside from the inelastic tube protruding elements. At the same time the simple, fast and safe installation and positioning of the stop ring is achieved by its resilient latching.

Exemplary embodiments and further advantages of the invention are explained below in connection with the following figures. It shows:

1 a schematic representation of an inelastic tube, elastic hose and connecting element according to eimäß second embodiment of the invention in the unassembled state from the outside;

2a a schematic representation of an inelastic tube, elastic tube and connecting element according to the second embodiment of the invention in the assembled state from the outside;

2 B a schematic sectional view of 4a ;

3a a schematic representation of an inelastic pipe and connecting element according to a third embodiment of the invention in the assembled state from the outside;

3b a schematic sectional view of 5a ;

4a a schematic representation of an inelastic tube, elastic tube and connecting element according to the third embodiment of the invention in the assembled state from the outside; and

4b a schematic sectional view of 6a ,

1 shows a schematic representation of an inelastic tube 1 , an elastic hose 2 and a connecting element 3 in the non-assembled state from the outside. 2a shows a corresponding schematic representation in the assembled state from the outside; 2 B shows a schematic sectional view of 2a ,

The inelastic tube 1 , which in this embodiment, a plastic tube 1 made of polyamide, has a wall 10 on. Inside the plastic tube 1 For example, a medium, preferably a fluid, can flow. This considered an end 11 of the plastic pipe 1 has a radial expansion 12 on, the opposite to the remaining cross-section of the plastic pipe 1 has a larger radius R. This radially expanded end 11 can be on an appropriate recording 30 of the connecting element according to the invention 3 be deferred.

The elastic hose 2 , which in this embodiment, a rubber hose 2 is made of an elastomeric material, has a wall 20 on. Inside the rubber tube 2 For example, a medium, preferably a fluid, can flow. This considered an end 21 of rubber hose 2 has an end portion 22 on, which is provided that a radial securing element such. B. a spring band clip at this point of the rubber hose 2 can be positioned. This end 21 can be on an appropriate recording 32 of the connecting element according to the invention 3 be deferred. Furthermore, the rubber hose points 2 from the end portion 22 in the longitudinal direction A spaced a radial expansion 23 on, which is provided, a corresponding radial projection 33 one in the hose end 21 inserted connecting element 3 take.

The connecting element 3 has a compact design, in which the first recording 30 for receiving the inelastic tube 1 from the pipe 1 facing the end of the connecting element 3 to the radial projection 33 is formed continuously and has a length that at least one radial securing element such. B. a clamp can be mounted here.

Here is the radial projection 33 on the one hand designed rounded such that damage to the elastic tube 2 especially during assembly is avoided. On the other hand, the radial projection 33 formed such that it has a stop for the inelastic tube 1 representing which of the radial projection 33 opposite end of the connecting element 3 on the first shot 30 to the radial projection 33 on the connecting element 3 can be deferred.

The claw contour 31 of the connecting element 3 is formed to cover the area of the first receptacle 30 as far as leaves free that a smooth area for receiving the radial securing element is formed. Beyond this area has the connecting element 3 at least one circumferentially at least partially encircling Verkrallungskontur 31 on which the mounted inelastic pipe 1 secures against peeling and at the same time this deformed radially outwards, so that an externally visible and palpable radial ring contour 13 is formed, which serves as a marking of the one end of the first recording 30 is used; the other end of the first shot 30 is due to the radial projection 33 formed so that the radial securing element in the longitudinal direction A can be mounted therebetween and here a smooth and from the inside by the connecting element 3 supported receiving area 30 finds.

This recording area 30 between the radial ring contour 13 and the radial projection 33 at the same time forms the second shot 32 this kurzbauenden embodiment for receiving the elastic tube 2 , This one can now with its end section 22 according to the invention safely over the radial projection 33 to the radial ring contour 13 on the end of the inelastic tube 1 be deferred and then secured by a radial securing element against removal. The defined stop, up to which the elastic hose on the second receptacle 32 can be postponed, by the radial ring contour 13 formed, in turn, by the Verkrallungskontur 31 of the connecting element 3 is trained. This overlap both the two shots 30 . 32 of the connecting element 3 and the end section 22 the elastic tube 2 and the radial expansion of the inelastic tube 1 in the longitudinal direction A.

3a shows a schematic representation of an inelastic tube 1 and a connecting element 3 according to a second embodiment of the invention in the unassembled state from the outside and 4a the same element 1 as well as an elastic hose 2 in the assembled state. 3b and 4b show corresponding sectional views of the 3a and 3a ,

This second embodiment extends the second embodiment by a stop ring 5 as a separate component, which preferably before mounting the inelastic tube 1 with the connecting element 3 on the inelastic tube 1 is postponed. Is then the connecting element 3 , as regards the 1 to 2 B described in the radial expansion 12 of inelastic pipe 1 has been inserted, the stop ring 5 in the longitudinal direction A over the radial ring contour 13 pushed over. For this purpose, the stop ring 5 a spring element 50 on, which can also be referred to as lip and which when exceeding the radial ring contour 13 compressed in the thrust direction and after exceeding the radial ring contour 13 rebounded again and so moving in the longitudinal direction A from the end 11 of inelastic pipe 1 prevented away. Through this stop ring 5 a defined stop is created, the second shot 32 for receiving the elastic tube 2 forms and so a defined pushing the elastic tube 2 on the connecting element 3 including inelastic tube 1 ensures. The elastic hose 2 can then use a safety clamp 4 in the area 22 secured against removal.

LIST OF REFERENCE NUMBERS

A

Longitudinal direction, longitudinal axis

R

Radial direction or radius perpendicular to the longitudinal axis A.

1

inelastic tube, plastic tube

10

Wall of plastic pipe 1

11

End of the plastic pipe 1

12

radial expansion of the end 11

13

radial ring contour of the end 11 , second stop

2

elastic hose, rubber hose

20

Wall of the hose 2

21

End of the hose 2

22

End section of the hose 2 for receiving the radial securing element 4

23

radial expansion of the hose 2

3

connecting member

30

first receptacle for inelastic tube 1

31

Claw contour of the first shot 30

32

second receptacle for elastic hose 2

33

radial projection of the second receptacle 32 , first stop

4

safety clamp

5

Stop ring, second stop

50

Spring element of the stop ring 5

Claims (6)

Connecting element ( 3 ) for connecting an inelastic tube ( 1 ) with an elastic hose ( 2 ), wherein the connecting element ( 3 ) a first shot ( 30 ) for receiving the inelastic tube ( 1 ) and a second recording ( 32 ) for receiving the elastic tube ( 2 ), wherein the connecting element ( 3 ) a first stop ( 33 ) against which the inelastic tube ( 1 ) for taking a defined position in the longitudinal direction A on the connecting element ( 3 ) can be pushed, and wherein the connecting element ( 3 ) a second stop ( 13 ; 5 ), against which the elastic hose ( 2 ) for taking a defined position in the longitudinal direction A on the connecting element ( 3 ) can be postponed, characterized in that the two recordings ( 30 . 32 ) are arranged overlapping in the longitudinal direction A. Connecting element ( 3 ) according to claim 1, wherein the connecting element ( 3 ) a radial projection ( 33 ), which is provided during assembly of the elastic tube ( 2 ) to be introduced into this and which is formed so rounded that the assembly of the elastic tube ( 2 ) and this can be mounted without damage. Connecting element ( 3 ) according to one of the preceding claims, wherein the receptacle ( 30 ) a Verkrallungskontur ( 31 ) for holding the deferred inelastic tube ( 1 ) having. Connecting element ( 3 ) according to claim 3, wherein the Verkrallungskontur ( 31 ) the inelastic tube ( 1 ) can expand radially in this area in such a way that on the outside of the inelastic tube ( 1 ) a radial ring contour ( 13 ) as a second stop ( 13 ) for the elastic hose ( 2 ) is formed. Connecting element ( 3 ) according to one of the preceding claims, which consists of a non-metallic material, preferably of a plastic, particularly preferably of a plastic with glass fiber content. Connection system ( 3 . 5 ), with a connecting element ( 3 ) according to one of the preceding claims, characterized in that a stop ring ( 5 ) is provided to the side of the inelastic tube ( 1 ) in the longitudinal direction A via the radial ring contour ( 13 ) to be pushed resiliently and against movement of the thrust to block movement and a second stop ( 5 ) for the elastic hose ( 2 ) train.

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