DE2700516C2 - Locking ring-sleeve connection - Google Patents

Description

The invention relates to a locking ring sleeve connection for a cylindrical tube with a tubular locking ring, which has at least one conical zone inside, and with a sleeve with cylindrical inner bore in which the pipe to be connected can be slidably received, the sleeve at Sliding of the locking ring over this can be pressed radially against the tube, the locking ring on the inside a first further and a second narrowed conical zone connected to an interior between them adjacent cylindrical zone of the locking ring, and the outer jacket of the sleeve peripheral areas having different diameters, which with the inner zones of the locking ring cooperate.

In a known locking ring-sleeve connection of this type (US-PS 38 93 720) has the locking ring inside except for the conical zone a conical Gate phase on, with a cylindrical zone between the conical gate phase and the conical Zone is provided. A closed ring encircling the sleeve is always located within the inner one conical zone of the locking ring.

Also known is a sleeve-pipe connection (US-PS 38 93 718), in which a serving as a tool Ring is provided, the inner cylindrical portion of which concludes the pressing process of the sleeve and tube done so that cylindrical portions hold annular ribs in the depressed state.

After the sleeve-tube connection has been established, the The ring serving as a tool is stripped off again. This proves to be a disadvantage in this sleeve-tube connection that the risk of elastic recovery of the tube and shell is not excluded

The invention is based on the object of a locking sleeve connection to be designed according to the type mentioned so that for radial contraction of tube and sleeve in a particular

a high pressure concentration is caused to the area.

This object is achieved according to the invention in that a series of cylindrical zones is provided, which divides an alternating series of conical zones, and that the sleeve or tube with at least an annular rib is provided which is intended to be located within the axial limits to occupy the cylindrical zone in order to achieve an increased constriction with a corresponding increased to cause mutual connecting engagement between the sleeve and the tube.

Advantageously, at least one segment-shaped rib is provided on the sleeve or the tube in order to to effect a twist lock between the sleeve and the tube.

The greater number of alternating conical and cylindrical zones of the locking ring ensure> n connection with the engagement of the cylindrical zones and the annular ribs in the pressed-in state an excellent mutual connecting engagement between the sleeve and the tube. Embodiments of the locking ring-sleeve connection according to the invention will now be explained with reference to the drawings
F i g. 1 is a side view of one embodiment of the locking ring-and-socket connection of the invention having a pair of tubes, the locking ring being shown in its initial position;

F i g. 2 is a partial view according to FIG. 1, wherein the locking ring shown in its final position;

F i g. 3 is an enlarged sectional view taken along line 3-3 in FIG. 1, with the locking ring in its initial Location is shown;

F i g. 4 one of the F i g. 3 shows a view corresponding to that, the locking ring being shown in an intermediate position; F i g. 5 is a sectional view similar to FIG. 3, with the locking ring shown in its final position is;

F i g. 6 is an enlarged partial section of another embodiment of the locking device according to the invention Lungsring-sleeve connection, wherein a pair of tubes, one of which has a bell-shaped end, and the Locking ring are shown in its final position after going over the bell-shaped end is depressed from the open end;

F i g. 7 one of the F i g. 6, similar sectional view, with the locking ring in its final position is shown after passing over the outwardly flared end of the bell-shaped end from the closed End is pushed out;

F i g. 8 shows a partial section according to circle 8 in FIG. 6;

9 is a sectional view of a further embodiment the locking ring-sleeve connection according to the invention, wherein a pair of tubes are bell-shaped Ends for the purpose of arrangement over an inner one

have b5 coupling tubular member and the parts in a position shown for assembly;

Fig. 10 is a partial section, showing the locking ring-sleeve connection in their assembled

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stand is shown;

11 shows an enlarged partial section according to circle 11 in FIG. 10;

F i g. 12 is an enlarged sectional view taken along the line 12-12 in Fig. 9, one rib having a modified design is;

Fig. 13 is a sectional view taken along line 13-13 in Figure 10, with the modified rib shown when it causes a twist lock;

14 shows a partial longitudinal section of a further embodiment the locking ring-sleeve connection according to the invention, with the parts in their initial Location are shown;

F i g. 15 one of the F i g. 14 corresponding view, but with the parts shown in their fixed position are;

Fig. 16 is a partial section along line 16-16 in Fig. 14;

17 is a sectional view taken along line 17-17 in FIG Fig. 15

FIG. 18 is a partial section corresponding to the area within circle 18 in FIG. 14, showing a modified rib; FIG.

19 is a sectional view taken along line 19-19 in FIG Fig. 18; and

F i g. 20 one of the F i g. 18 similar view, with a further modification is shown.

The embodiment of the locking ring-sleeve connection shown in FIGS. 1-5 is in particular for producing a high-strength connection between a pair of tubes 1 and a surrounding sleeve 3 suitable. The tubes 1 lie opposite one another with end sections 2, which are received in the sleeve 3 will. The sleeve 3 has a cylindrical inner bore with a pair of opposing cones Sealing and mating zones 4 which come elastically with the end portions 2 into engagement.

A sleeve 5 is provided with a centrally arranged outer retaining flange 5. The sleeve 3 is provided with outer conical zones 6 adjacent to the opposite sides of the retaining flange 5. The sleeve 3 comprises a first outer cylindrical zone 7 which continues from each zone 6 and which ends at an outer annular rib 8, the opposite side 9 of which is inclined. Following the inclined side 9 of the rib 8, the sleeve 3 has a second outer cylindrical zone 10. Each end 11 of the sleeve 3 is beveled on the outside.

Each side of the sleeve 3 receives a tubular locking ring 12, which is a short cylindrical Has input end 13, the outer end of which can be beveled. The locking ring 12 has axially inward from the inlet end 13, a conical zone 14, which is adjoined by a cylindrical zone 15. The zone 15 is followed by a conical zone 16 which ends at a short shoulder 16a.

The embodiment of the locking ring-sleeve connection according to FIGS. 1 to 5 is assembled as follows:

During pre-assembly, a pre-lubricated pair of locking rings is positioned so that their Entrance ends 13 lie over the ribs 8, as shown in FIG. 3. Then the pair of tubes 1 η the sleeve 3 used, with a slight end force ten pipes is maintained. Finally, t> 5 at the same time opposing axial forces are applied to both locking rings 12 to the locking rings 12 to press the sleeve 3. Initially, the conical zones 16 are the locking rings 12 arranged at a distance from the sleeve 3, so that the on each rib 8 applied axial force is first converted into a constricting force, which is applied to the corresponding Ribs 8 is applied.

It is desirable that the dimensions of the sleeve 3 and the selection of the metal comprising the sleeve 3 are such that some axial buckling of the sleeve 3 can occur between the ribs 8 and the retaining flange 5 to the extent that that a firmer elastic seat and sealing connection between the end sections 2 and the conical sealing zones 4 is formed.

Further movement of the locking rings 12 causes the terminal conical zones 16 the outer cylindrical zones 10 of the sleeve 3 compress while the cylindrical zone 15 moved over the rib 8 without exerting any further constricting force on it. When the locking rings 12 are in their final position, where they abut the retaining flange 5, the sleeve 3 forms A pair of first constricted portions 17 and second constricted portions 18, and each Tube has a corresponding first constricted portion 19 and a second constricted Area 20, as shown in FIG. 5 is shown.

Resilient recovery of the tubes occurs just outside the shoulder 16a of the locking ring 12 on. The sharp edge of the rib 8 assists in holding the locking ring 12 in place. Even the locking ring 12 is in its final position through an elastic recovery of the sleeve 3 locked.

The cylindrical zones 10 and 15, which can be sized to create a sliding fit, have the effect of that the necessary to constrict the ribs 8 and to narrow the cylindrical zone 10 Force does not occur simultaneously, but in succession.

While the sleeve 3 allows buckling to a certain extent, that is required to compress the rib 8 Force a local force exerted by the conical zone 14 during the cylindrical zone 15 slides over the cylindrical zone 10. Then when constricting the cylindrical zone 10 is the required Force limited to the local force exerted by the conical zone 16 plus one moderate frictional force between the rib 8 and the cylindrical zone 15.

In the case of the FIG. 6 to 11 emerging embodiment of the locking ring-sleeve connection, the locking ring 21 has a row inside alternating conical and cylindrical zones, namely close to a conical gate phase 22 successively a first cylindrical zone 23, a first conical zone 24, a second cylindrical zone 25, a second conical zone 26, a third cylindrical zone 27, a third conical zone 28 and finally a fourth cylindrical zone 29, the locking ring 21 ending in a short shoulder 30. In some Cases can the locking ring 21 to increase its strength in the shoulder 30 with a Ersireckung 31 may be provided, as shown in FIGS. 6 and 7.

According to FIG. 6 and 7, the locking ring connects a pair of tubes 32 and 33, tube 33 having a bell-shaped end 34 into which tube 32 extends. At Hi ^ cor- δ o ~. -a : · ■

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gelungsring 21 pressed over the open end of the bell-shaped extension. In Fig. 7 is the locking ring 21 has been pressed over the outwardly widening end 35 of the bell-shaped extension.

The locking ring 21 is particularly suitable for use with tubular members made of soft material such as soft aluminum. The actuation of the locking ring 21 in conjunction with the The tubular members 32 and 33 are shown in FIGS. 6, 7 and 8 as follows:

The cylindrical zone 23 of the locking ring 21 forms a sliding fit over the bell-shaped end 34 when the locking ring is positioned over the outwardly flared end 35. If the Locking ring 21 is inflated, the first conical zone 24 pushes the bell-shaped extension in intimate contact with the tube 32, compensating for the dimensional tolerance, as shown in FIG. 8 shown is. After intimate contact is made, the first conical zone 24 causes an initial one simultaneous narrowing of the two tubes.

Since there is no further narrowing in the second cylindrical zone 25, the force required is essential less than if this zone were conical. The frictional force in the cylindrical zone can be done using a conventional high-strength lubricant such as graphite or carbon fluoride be reduced to a minimum, on the inside of the locking ring or on the outer end of the bell-shaped extension is applied.

However, additional force is required when the conical zone 26 is on the end of the bell-shaped Expansion is moving. The size of the additional force is determined by the axial length of the conical Zone 26 predetermined. Another compression occurs during the movement of the third cylindrical Zone on the end of the bell-shaped extension does not enter.

Ultimately, a maximum constriction occurs when the final conical zone 28 on the bell-shaped End of 34 is printed. When the shoulder 30 moves on the bell-shaped end 34, the pipes experience a regression of their springback in relation to the resilience of the material. This creates a large locking force which counteracts the removal of the locking ring.

The series of conical zones spaced apart by the cylindrical zones not only significantly reduces the force required to install the locking ring, but also provides a spaced series of sealing contacts and distributing any bending load acting on the pipes kana The long cylindrical contact zones create a resistance against twist.

Because of the outwardly widening end 35, an axial pressure is exerted against the bell-shaped end outward radial force tending to curve the bell-shaped end. This is due to the row arrangement of cylindrical and conical zones reduced to a minimum, so that relatively thin walls allowed are. If extremely thin walls or walls made of soft material are required, the locking ring at the outwardly widening end 35, as shown in FIG. 7 shown with the bell-shaped end 34 held under stretch rather than pressure.

The from the F i g. 9, 10 and 11 emerging embodiment the locking ring-sleeve connection has a sleeve 36 with an annular retaining shoulder 37 on. Adjacent to the holding shoulder 37, the sleeve 36 has a first cylindrical zone 38 which is at a first outer annular rib 39 of low profile ends. The axial inner edge of the rib 39 forms a short edge 40, and its axially outer edge

ίο a conical edge 41.

A second cylindrical zone 42 of slightly smaller diameter than that connects to the rib 39 first cylindrical zone 38. The second cylindrical zone 42 is provided with a second annular rib 43

is connected, which also has a short edge 40 and a has a conical edge 41. A third cylindrical zone 44, somewhat smaller, adjoins the second rib 43 Diameter as the second cylindrical zone 42. The sleeve 36 has a beveled end 45 Mistake.

The sleeve 36 takes the bell-shaped end 46 of a tube 47, which is connected to the latter via a outside expanding portion 48 is connected to. The inside diameter of the bell-shaped end 46 is such that it is slidable over the first rib 39. The locking ring 21 completes, as described above, the locking ring-sleeve connection, which is assembled according to FIGS. 9, 10 and 11 as follows will:

The sleeve 36 is inserted into the bell-shaped end 46 until it abuts the retaining shoulder 37. The locking ring 21 initially rests on the tube 47 beyond the bell-shaped end 46 of the tube 47 The internal dimensions of the locking ring 21 are so that the first cylindrical zone 23 over the enlarged portion 48 of the bell-shaped end 46 fits. When the locking ring 21 over it is pressed, the series of conical and cylindrical zones operate as in relation to FIG. 6, 7 and 8 described.

The first rib 39 is within the confines of the second cylindrical zone 25 of the locking ring 21 when the leading end of the locking ring strikes against the retaining shoulder 37. the Rib 39 causes further pressure of the sleeve 36 in this area, and the pressure forces cause one local flow of the material comprising the bell-shaped end 46 around the rib 39 around effect a tight locking and sealing connection therebetween. Similarly, the third cylindrical presses Zone 27 of the locking ring 21 the gk> kken-shaped, end 46 around the second rib 43, to provide a second locking and sealing connection which is enlarged in FIG. 11 shown is

As shown in FIGS. 6, 7 and 8, a third locking is effected by the third conical zone 28 and the shoulder 30 which is formed at the rear end of the locking ring 21. The shoulder 30 is in its position due to the slight springback of the sleeve 36 and the bell-shaped end 46 locked when the constricting force of the locking ring is removed.
The radial dimension of the annular ribs 39 and 43 are exaggerated for clarity. In fact, their radial dimension may be on the order of 0.3 mm.
The sleeve 36 and the bell-shaped end 46 of the

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Tube 47 are preferably made of cold-deformable materials of certain flexibility, such as Copper or aluminum and various alloys. The locking ring 21 is made of a Formed material that makes it much more stable than the sleeve 36 and that at the same time with greater wall thickness Tube 47, and he can, for. B. have a greater compliance. The locking ring 21 can be made of steel or made of high strength alloys. If the wall thickness is increased, the strength of the Locking ring 21 are reduced. The strength of the locking ring is further in the range high load on the shoulder 30 increased by the extension31.

The F i g. 12 and 13 make it clear that to increase -, 5 the resistance to torsional forces the annular rib 39 or 49 with a ring of axially extending Channels 39a can be provided, which can be only a few thousandths of a millimeter deep. When the locking ring 21 is pushed into place, some material of the bell-shaped end 46 flows into the Channels 39a, as indicated by 46a in FIG. 13 is indicated.

An embodiment of the locking ring-sleeve connection that withstands torsional loads suitably, is also in FIG. 14 to 20 and according to FIG. 14 to 17 a tube 49 of initially more uniform Dimension and a sleeve 50 with an outer retaining flange 51, an outer conical zone 52 adjacent each side of the retaining flange 51 and an inner conical zone 53 below each of the outer ones conical zones 52. Subsequent to each conical zone is a zone 54 of reduced wall thickness, which adjoins a zone which is circumferentially in \ bstand each other arranged outer segment-shaped Ribs 55 with beveled guide surfaces 56 and circumferentially separated inner segment-shaped Has ribs 57. Beyond each pair of segment-shaped ribs 55 or 57 is located there is a second zone 58 of reduced wall thickness, to which a final cylindrical zone with a inner rib 59 connects

The sleeve 50 receives a locking ring 60 which is substantially the same as the tubular locking ring Can be 12, i.e. H. with a short cylindrical engaging end 13, a first inner conical Zone 14, an inner cylindrical zone 15 and a final inner conical zone 16, which in a short shoulder 16a ends

The assembly of the embodiment according to FIG. 14 to 17 happens as follows:

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is pressed, the first conical zone 14 comes into engagement with the segment-shaped ribs 55, the segment-shaped ribs 57 are pressed into the tube 49 so that spaced apart Depressions are generated, which form locking portions 61, the torsional stresses as also withstand axial forces.

At the same time, the rear shoulder 16a of the locking ring 60 pressed over the zone of the tube 49 which has the inner rib 59, thereby causing becomes that the rib 59 presses into the tube 49 and a narrowed sealing zone 62 forms an elastic spring back enters sleeve 50 and tube 49 so that the sealing zone defines an obtuse V shape

At the same time, the first conical zone 14 also comes in with the outer conical zone 52 of the sleeve 50 Engages and also exerts an axial compressive force.

The increasing force can cause the zones 54 and 58 of reduced wall thickness to buckle, thereby causing is caused that the end of the tube 49 clamped further against the inner conical zone 53, by one prestressed support area and to form a seal in addition to the seal, which is constricted in the Sealing zone 62 is formed

The leading end of the locking ring 60 comes with the retaining flange 51 in engagement to the cylindrical Zone 15 above the outer segment-shaped ribs 55 and the rear shoulder 16 in the middle between the ends of the inner segment-shaped rib 59 to be arranged. The retaining flange 51 can also be omitted and the locking ring 60 may have a rear cylindrical zone and an inner retaining flange exhibit.

In the first embodiment according to FIG. 1 to 5, the continuously formed retaining flange 8 of the Sleeve 3 are divided into sections and the web-like sections of the outer shape according to FIGS. 14 to 17 can Be ribs. In particular, as shown in FIGS. 18 and 19, instead of the inner segment-shaped Rib 59 an inner annular rib 63 may be provided which has an inner inclined surface, which has a zone with a series of slots 64. If a narrowing connection, provided with a When the rib 63 is attached, the tube 49 is locked in the slots 64. However, the neighboring zone creates of the tube 49 forms a sealing connection with the smooth zone of the rib 63. According to FIG. 20 can be a similar one Result can be achieved by providing a stepped zone that faces in opposite directions is slotted.

For this purpose 3 sheets of drawings

Claims (2)

27 OO 516 claims: 1. Locking ring-sleeve connection for a cylindrical tube with a tubular locking ring, which has at least one conical zone inside, and with a sleeve with a cylindrical Inner bore in which the pipe to be connected can be slidably received, the sleeve when sliding of the locking ring can be pressed radially against the tube via this, the locking ring on the inside a first further and a second narrowed conical zone connected to one between them adjoin the inner cylindrical zone of the locking ring, and the outer jacket Sleeve has circumferential areas of different diameters, with the zones located inside of the locking ring cooperate, d a characterized in that a number of cylindrical zones are provided, which subdivide an alternating series of conical zones, and that the sleeve (3) or the tube (1) is provided with at least one annular rib (8) which is intended to occupy a position within the axial limits of the cylindrical zone (15, 25), by an increased constriction with a correspondingly increased mutual connection engagement between the sleeve and the pipe. 2. locking ring sleeve connection according to claim t, characterized in that at least a segment-shaped rib (55) is provided on the sleeve (3) or the tube (t) to provide a twist lock between the sleeve and the pipe.