DE10055348A1 - Method to produce a pipe-mounting connection and the subsequent manufactured pipe-mounting connection - Google Patents

Abstract

The method involves an inner sleeve (11) in which a pipe is pushed, an outer sleeve (20) that sits over the inner sleeve and a pipe supports (1) that have corresponding fixture or locking means that facilitate fixture of the outer sleeve to the pipe supports. There are radial outwardly-oriented notch projections (28) on the outer circumference of the outer sleeve which grip together with associated axially-oriented mounting guides (34) on the outer circumference of the pipe supports and are secured via a locking spring (10) held on the pipe supports. Both are formed, with a pressure tool, from a sheet plate (39) with the outer sleeve being formed in a cavity (38). The notch projections are formed from the wall material of the outer sleeve that extend radially outwards.

Description

The invention relates to a method for producing a Hose plug connection and a hose plug connection produced thereafter according to the preamble of claim 1.

Such a connector for the connection of pipe and Hose lines are, for example, with the same applicant declining DE 195 22 691 A1 become known.

An essential feature of this construction is that the above Pipe connector consists of a total of three parts, namely one Inner sleeve, over which a hose is pushed, an outer sleeve, the sits over the inner sleeve, and a pipe socket with corresponding  sits over the inner sleeve, and a pipe socket with corresponding Fastening or locking means is provided in order to insert the outer sleeve in the pipe socket to fix this in the pipe socket.

The locking means used to fix the outer sleeve in the pipe socket are shown in usually designed as a spring, and are on the outer circumference of the outer sleeve evenly distributed locking lugs arranged in corresponding plug-in guides intervene on the outer circumference of the pipe socket and there secured by the Latching spring are held on the pipe socket.

It is known in the manufacture, the locking lugs from the wall material to push the outer sleeve radially outwards or by attaching Make slots by shearing the wall material.

The conventional manufacturing technique of such an outer sleeve was so that first a cylindrical one in a corresponding drawing tool Manufactured outer sleeve and then afterwards in a second manufacturing process from the wall material of the outer sleeve the locking lugs by a radially from the inside produced outward-looking spinning tool.

The pressing tool thus pressed the wall of the outer sleeve radially outwards and shaped the respective latch.

A disadvantage of this manufacturing process, however, is that the radial outward pressure deformation of those already deformed by pressing Wall of the outer sleeve, with the aim of forming such locking lugs unwanted flow of material in the area of this wall took place, which led to a Material rejuvenation led. This had the disadvantage that the Wall thickness of the pressed-out latch was significantly less than that Wall thickness of the remaining wall of the outer sleeve.  

Depending on the height of the radially outward shaped catch, one had to Material thinning of about 60-70% of the wall thickness with respect to the rest Accept the wall of the outer sleeve.

It often happened in the manufacture of such locking lugs that the material tore and the outer sleeve became unusable as a result.

It was very limited in the height of the locking lugs to be produced.

Ideally, such locking lugs should be as high and narrow as possible his. A high detent is therefore desirable to ensure that when Put together the pipe connector that sits on the outer sleeve Sealing ring does not collide with the detent spring on the pipe socket and as a result is damaged.

In addition, it is ensured by a high locking lug that then in the Pipe stub not arranged in the area of the plug guide protrudes the inside diameter of the pipe socket. With low latches namely there is the disadvantage that the arranged in the pipe socket Breakthrough breaks through the wall of the pipe socket and a This causes weakening of the pipe socket material. This is done by a Avoided the highest possible catch. This ensures that the Breakthrough only in the area of the plug-in guide for the locking lug is arranged and no further into the wall of the pipe socket extends and there causes a material weakening.

In the same way, the prior art cannot do one - in the circumferential direction seen - ensure relatively narrow latch.  

The term "narrow locking lug" means that the insertion opening, that the locking lug defines in the outer sleeve, be as narrow and high as possible should.

A narrow latch is preferred because yes in the area of Inner circumference of the outer sleeve sealing the outer circumference of the hose to be sealed.

There are now large areas of this encircling, sealing Then jump the inner circumference radially outwards (such as very wide locking lugs) there is a leakage problem in this area because the hose then this outwardly projecting area is deformed outward and the Tightness is no longer guaranteed.

In addition, a narrow locking lug gives the advantage that it is inexpensive Protection against rotation is present. This results in steep flanks that can lead to the fact that despite the given snap connection between the Latch and the opposite, arranged on the pipe socket Plug-in guide an unintentional rotation of the two parts takes place.

The steeper and higher the latch, the more difficult it is unintentional rotation of the outer sleeve to the snapped pipe socket.

In order to ensure an optimal protection against rotation, it was previously common, still an additional anti-twist device between pipe socket and outer sleeve to provide what with higher manufacturing costs and with greater effort was connected.

The invention is therefore based on the object of a method for the production a hose connector and one manufactured afterwards Refine hose connector so that the locking lug is essential  has higher material stiffness that it has an improved anti-rotation between the outer sleeve and pipe socket and that on the outer sleeve Seated sealing ring when inserting the outer sleeve into the pipe socket with the pre-assembled detent spring collides.

To achieve the object, the invention is based on a method according to characterized technical teaching of claim 1.

An essential feature of the invention is that now approximately in one operation sheet metal sheet in a first step in one cylindrical die is deformed into it, with the help of a drawing punch guided perpendicularly against the surface of the sheet metal plate, and that in the same process step, the locking lugs while pulling the Outer sleeve due to radial outward deformation of the sheet metal in the space be formed between die and die.

It is therefore important that during the drawing process the sheet metal plate becomes one in itself closed outer sleeve is deformed and at the same time the radial outward locking lugs from the wall of the outer sleeve with be shaped.

This is the main advantage that the wall thickness of the locking lugs is no longer weakened. It has been shown that this drawing process now the wall thickness of the locking lugs now approximately the wall thickness of the surrounding Material of the outer sleeve corresponds.

It is now possible for the first time to have locking lugs with a relatively large radial height correspondingly in the circumferential direction extending smaller width generate an optimal anti-rotation device in the direction of the plug guide result in the pipe socket. This forms steep flanks on the latch, which prevent overtightening of the anti-twist device with certainty.  

Another advantage of the method according to the invention is that the locking lug is designed as a continuous web aligned in the axial direction, which - as indicated - has a uniform, continuous wall thickness that hardly deviates from the wall thickness of the undeformed outer sleeve.

It is now important that in the area of this - a relatively high wall thickness having - locking lug introduced a slot in a further step which extends in the circumferential direction and which is approximately web-shaped trained, semicircular locking lug breaks through in the circumferential direction.

This slot engages when the outer sleeve and pipe supports are plugged together the detent spring and thus forms a good position securing of the plug-in guide once through the locking lug on the outer circumference of the outer sleeve and on the other formed by assigned plug guides on the outer circumference of the pipe socket are.

The advantage of being subsequently molded into the web-shaped locking lug Slot is that only the slot geometry for the accuracy of the Resting connection is responsible.

After in this slot - which can now be manufactured very precisely - the Latching spring engages the connector, the slot can with high accuracy are produced so that no undesirable play between the detent spring and Slot is created.

It is thus by the inventive design of the latch as continuous, axial web with a slot breaking through this web high accuracy of the locking connection achieved.  

As an example, it is stated that with an outer sleeve diameter of, 35 mm a locking lug protruding over this diameter of 3.5 mm Height is reached.

With correspondingly larger outer diameters of outer sleeves, this is Ratio of the height of the locking lug to the diameter of the outer sleeve much cheaper; with an outer sleeve with a diameter of 65 mm Latch heights of 5 to 7 mm reached, the width of the latch (Extension in the circumferential direction) is only 4 mm. So it becomes managed a very narrow insertion opening, which for a small Backlash of the plug coupling ensures.

Another advantage of the method according to the invention is that the described forming process, the material stresses in the outer sleeve be evenly distributed; d. H. they are not undesirable, others Material tension present in the area of the latch. This is a significant advantage over the prior art, because the state of the art In a further operation, the latch was made from the material of the technology already formed around the outer sleeve, which leads to additional Material stresses in the area of the latch led. This resulted in one Rejection of the catch during the production of the slot.

This also has the advantage that the material of the so formed The latch is very inherently stiff and therefore incorrect operation of the connector overall is difficult.

In the prior art, it had to be accepted that the used, relatively weak material and also low locking lugs The catch did not hit the plug guide in the pipe socket, but next to it was inserted.  

This did not secure the connector because it was unintentional and undesirable was possible, the latch next to the plug guide in the pipe supports introduce.

This is advantageously avoided in the invention, because it is the Locking nose equipped according to the invention with a high material rigidity, the a subsequent deformation of the material of the locking lug when inserted into the Avoids plug-in guide and on the other hand by attaching the high and steep flanks of the locking lug achieved that in no case such Latch inadvertently next to the plug guide (receiving opening in the pipe socket).

The measures according to the invention therefore make operational reliability such a hose connector significantly improved.

Another essential feature of the invention is the possibility of One-hand operation of the pipe connector mentioned, which is thereby achieved comes that a specially shaped detent spring is used.

This detent spring preferably consists of two symmetrical at an angle to one another with respect to a longitudinal center axis made relatively straight Legs, each at the free outer ends of the approximately U-shaped Detent spring are arranged, and the legs just formed in each pass over curved bends symmetrically arranged to each other, which in turn merge into a straight middle leg.

This detent spring can be guided in a circumferential annular groove on the pipe socket be opened by twisting in any direction without it must be completely removed from the pipe socket or even falls off.  

Compared to the own patent DE 195 22 691 there is the further advantage that the detent spring is attached to the pipe socket in any rotational position and with the outer sleeve can be locked, while in the prior art Rotational position of the detent spring is relatively fixed.

The subject matter of the present invention does not only result from the subject of the individual claims, but also from the Combination of the individual claims.

All disclosed in the file, including the summary Information and features, especially those shown in the drawings spatial education are claimed as essential to the invention, insofar as they individually or in combination are new compared to the prior art.

In the following, the invention will be explained using only one embodiment illustrative drawings explained in more detail. Here go from the drawings and its description further features and advantages of the invention Invention.

Show it:

Fig. 1 perspective view of a pipe connector according to the invention in an exploded view

Fig. 2 The cane connection according to Fig. 1 in the assembled state

Fig. 3 The front view of the plug connection in the direction of arrow III in Fig. 1 showing the outer sleeve and inner sleeve

Fig. 4 section through the arrangement of FIG. 3 in the amount of line IV-IV

Fig. 5 detail view of the catch in the enlarged scale of FIG. 4

Fig. 6 is a detail view on an enlarged scale of the illustration of FIG. 3

Fig. 7 The front view of the latch

Fig. 8 schematically, the fabrication of an outer sleeve according to the inventive method

Fig. 9 schematically shows the side view of a locking lug with representation of geometric relationships

In Figs. 1 and 2, a pipe socket 1 is shown generally consisting of a plastic material or a metal material. According to FIG. 2, it has an inlet bore 2 on the end face.

Starting from a cylindrical section 3 , guide ribs 8 , 9 are formed on the pipe socket 2 at a distance from one another and form an annular groove 33 between them. A detent spring 10 engages in this annular groove.

The detent spring is formed exactly symmetrical to its longitudinal center axis and has symmetrically angled, straight legs 45 which are each formed by eyelets at their free outer ends.

At the respective end of the leg 45 there is in each case an arc piece 47 which runs into the middle leg 46 . The middle leg 46 is straight.

With this design, there is the advantage that the detent spring 10 can be inserted in any rotational position in the annular groove 33 between the guide ribs 8 , 9 , because the three straight pieces 45 , 46 each in the associated openings 5 in the region of a plug guide 34 Reach through pipe socket 1 and there are three different rotational or mounting positions for the detent spring 10 .

The plug-in guide 34 on the pipe socket 1 is formed, moreover, by a slope 4 rising from the wall of the pipe socket 1 , which opens into an apex surface 6 which rises in the axial direction on the outer circumference of the pipe socket 1 above the outer diameter of section 3 .

In the area of this apex 6 , the aforementioned opening 5 is present, through which the detent spring 10 with its parts 45 , 46 extends.

At the front, the pipe socket 1 is formed by the end face 7 , the diameter of the end face 7 abutting the end flange 27 of the outer sleeve 20 .

According to FIGS. 1 and 2, a sealing ring 18 is arranged between the pipe stub 1 and the outer sleeve 20, which sealingly rests in an annular groove 21 of the outer sleeve.

The annular groove 21 is formed by an edging 16 on the edge, which forms the outer flange 19 .

The flange 16 is formed from the material of the inner sleeve 11 , which is integrally connected to the outer sleeve 20 in this area by means of the flange 16 mentioned.

This type of connection technology is described in DE 197 43 825. The content of the disclosure of this description is intended to be entirely different from that Disclosure content of the present invention may be included.

Otherwise, the one end face of the inner sleeve 11 is formed by a bent-over flange edge 15 according to FIG. 1.

The hose 40 to be sealed is inserted into a hose receiving space 23 between the inner and outer sleeves 11 , 20 and fixed there in a sealing manner.

The other limitation of the annular groove 21 for the sealing ring 18 is formed by the shoulder 22 of the outer sleeve, which is also shown in FIG. 4, for example.

This paragraph 22 merges into the straight, cylindrical section 24 of the outer sleeve 20 .

It is now important that locking lugs 28 are deformed radially outward from the material of the cylindrical section 24 (wall material of the outer sleeve 20 ) evenly distributed over the circumference.

This is done by a method according to FIG. 8.

It is shown there that an approximately sheet-like sheet metal plate 39 , which can be either angular or round on the outer circumference, is placed in the space between a die 38 and a drawing die 41 which can be lowered into the die.

If the drawing die 41 is now driven with sufficient force in the direction of the arrow 42 , it deforms the sheet metal plate 39 into the die 38 .

It is important here that the corresponding number of drawing lugs 43 are arranged on the outer circumference of the drawing die 41 , which protrude radially outwards, with corresponding drawing recesses 44 in the die 38 opposite these drawing lugs.

For the sake of clarity, only parts 43 , 44 are simply shown here, although, for example, three such parts are arranged evenly distributed on the circumference.

With the pressing of the punch 41 perpendicular to the surface of the sheet metal plate 39 , the detents 28 are simultaneously formed in the drawing direction because they are formed in the space between the respective drawing nose 43 and the associated counter recess 44 in the die 38 .

This results in a representation as shown in FIG. 7.

The wall thickness 35 of the wall section 24 which remains undeformed does not therefore deviate significantly from the wall thickness 36 of the locking lug 28 produced in the drawing process according to FIG. 8.

This is decisive for the later strength of the locking lug 28 , because it is very stiff and material stresses in the area of the locking lug 28 are avoided.

At the same time, there is the possibility that a very narrow latching lug is achieved because the width 48 (opening width of the latching lug 28 ) can be selected to be very small compared to the circumference of the cylindrical section 24 .

Accordingly, there is a relatively large height 37 of the locking lug, which projects radially outward over the section 24 .

The absolute proportions were in the general description part of the Description explained.

It is important that a slot 12 is made in a further process step only after the production of the locking lug 28 , which slot at least partially breaks through the web-like locking lug to a certain axial length.

The catch spring 10 comes to rest later in this slot and the width of the catch spring 10 should be slightly smaller than the slot width of this slot 12 .

The slot can now be introduced very precisely by a punching process into the locking lug 28 which has already been produced and shaped.

The latch 28 thus rises above the undeformed and cylindrical section 24 through an oblique section 25 , which is formed from the wall thickness of the section 24 (see also FIG. 7), which in turn then extends to the height of the apex surface 31 of the latch 28 extends.

There are also radially outwardly deformed centering webs 13 made of the material of the cylindrical section 24 of the outer sleeve 20 . These centering webs 13 center the outer sleeve 20 on the pipe socket 1 because they are on the insertion diameter 17 on the inner circumference of the pipe socket 1 .

The locking lugs 28 are each open in the direction of the end flange 27 and form openings 32 there . These openings 32 result from the manufacturing method according to the invention.

The latching nose has very steep shoulders 30 , as can be seen in FIGS. 3 and 7. The height 37 of the locking lug 28 is particularly important with regard to the explanations for FIG. 9.

It can be seen there that the slot 12 is machined into the relatively high locking lug 28 , on the base 50 of which the locking spring 10 rests.

In an axial extension, this results in a line 51 which should lie above with a distance 53 above the upper edge 52 with a distance 53 of the sealing ring 18 . This is the only way to ensure that when the outer sleeve 20 is inserted into the pipe socket 1, the detent spring 10 does not collide with the sealing ring 18 . This is achieved by the distance 53 .

If, on the other hand, the locking lug is lower, line 51 shifts radially inwards and distance 53 disappears or even becomes negative. In this case, the detent spring 10 collides with the sealing ring 18 when the tube plug-in connection is inserted and damages it in an undesirable manner.

Another advantage of a relatively narrow locking lug according to FIG. 7 (narrow width 48 ) also results from the fact that a continuous, optimal sealing surface 49 is now formed for the contact of the outer circumference of the hose 40 .

The smaller this width 48 , the less is the possibility for the hose to deform radially outwards into this relatively slight bulge of the locking lug 28 .

This also results in superior sealing properties for the hose in the design of the locking lugs 28 according to the invention.

drawing Legend

1

pipe socket

2

inlet bore

3

section

4

slope

5

perforation

6

apex surface

7

front

8th

guide rib

9

guide rib

10

detent spring

11

inner sleeve

12

slot

13

centering

14

-

15

beaded

16

beading

17

introducer

18

seal

19

flange

20

outer sleeve

21

ring groove

22

paragraph

23

Tube receiving space

24

Section (straight)

25

Section (oblique)

26

-

27

end flange

28

locking lug

29

-

30

shoulder

31

apex surface

32

muzzle

33

ring groove

34

fitting guide

35

Wall thickness

36

Wall thickness

37

height

38

die

39

sheet metal blank

40

tube

41

drawing punch

42

arrow

43

drawing nose

44

Gegenausnehmung

45

leg

46

middle leg

47

elbow

48

width

49

sealing surface

50

Reason (slot

12

)

51

line

52

top edge

53

distance

Claims (11)

1. A method for producing a hose connector with an inner sleeve over which a hose is pushed, an outer sleeve that sits over the inner sleeve, and a pipe socket, which is provided with appropriate fastening or locking means to this when inserting the outer sleeve in the pipe socket to fix in the pipe socket, with radially outward locking lugs arranged on the outer circumference of the outer sleeve, which engage in assigned, axially aligned plug-in guides on the outer circumference of the pipe socket and are held there in position-secured manner by the detent spring on the pipe socket, using a manufacturing method, both with a pressing tool made from a sheet metal blank ( 39 ) the outer sleeve ( 20 ) is formed in a die ( 38 ), and the locking lugs ( 28 ) are formed radially outward from the wall material of the outer sleeve, characterized in that during the pulling of the outer sleeve ( 20 ) in the same process step locking lugs ( 28 ) are formed by radially outward deformation of the sheet metal plate ( 39 ) in the space between the die and the punch. 2. The method according to claim 1, characterized in that in the drawing process, the wall thickness ( 36 ) of the locking lugs ( 28 ) corresponds approximately to the wall thickness ( 35 ) of the surrounding material ( 24 ) of the outer sleeve. 3. The method according to claim 1 or 2, characterized in that after the manufacture of the locking lug ( 28 ) in a further process step, a slot ( 12 ) is made which at least partially breaks through the web-shaped locking lug ( 28 ) over a certain axial length. 4. The method according to claim 3, characterized in that the slot ( 12 ) is formed by punching the latch ( 28 ). 5. locking lug according to one of the preceding claims 1-4, characterized in that the locking lug ( 28 ) rises above the undeformed and cylindrical portion ( 24 ) of the outer sleeve in the form of an oblique portion ( 25 ) which rises to the height extends the apex surface ( 31 ) of the locking lug ( 28 ) and forms an opening ( 32 ) on the end face. 6. locking nose according to the method of any one of claims 1-5, characterized characterized that with a diameter of an outer sleeve of about 35 mm a locking lug protruding over this diameter of about 3.5 mm Height is formed. 7. Latch according to one of claims 1-5, characterized in that with an outer sleeve with a diameter of about 65 mm, the locking lug has a (radially outward) height of about 5 to 7 mm, and that the width of the locking lug (extension in the circumferential direction) is only about 4 mm is. 8. Hose connector according to one of claims 1 to 7, characterized in that starting from a cylindrical section ( 3 ) of the outer sleeve ( 20 ) on the pipe socket ( 2 ) at a distance from each other arranged guide ribs ( 8 , 9 ) are formed, which between them Form an annular groove ( 33 ) into which a detent spring ( 10 ) engages. 9. hose connector according to claim 8, characterized in that the detent spring ( 10 ) is formed symmetrically to its longitudinal center axis and consists of symmetrically angled legs, just formed legs ( 45 ), at the free outer ends of which eyelets are formed and that at the other end of the legs ( 45 ), a respective arc piece 47 connects, each of which runs into a straight leg 46 . 10. Hose connector according to claim 9, characterized in that the detent spring can be inserted in three different rotational positions in the annular groove ( 33 ) between the guide ribs ( 8 , 9 ). 11. Hose connector according to one of claims 1 to 10, characterized in that from the material of the cylindrical portion ( 24 ) of the outer sleeve ( 20 ) radially outwardly deformed centering webs ( 13 ) are formed, which center the outer sleeve 20 on the pipe socket 1 .