DE102019111199A1 - Connectors for media lines - Google Patents

Abstract

The invention relates to a plug connector (1) for hose and / or pipe connections, comprising a coupling part (2) into which a plug part (S) can be inserted, and a retaining clip (3) having four latching arms (15a, 15b) which can be preassembled on the coupling part (2) by radial insertion in an insertion direction (ER). The retaining clip (3) is U-shaped, with the legs of the U forming two pairs (15a / 15b, 16a / 16b) of diametrically opposed spring-elastic latching arms (15a, 15b, 16a, 16b) which extend in the axial direction (XX ) are arranged one behind the other. On a side of the first pair (15a / 15b) of locking arms (15a, 15b) facing the insertion direction (SR) of the plug part (S) there are front inclined surfaces (21a, 21b) which counteract the interaction with the plug part (S) the insertion direction (SR) of the plug part (S) diverge. It is proposed that these inclined surfaces (21a, 21b) are each arranged on radially inwardly directed prongs (14a, 14b) below the plug axis (XX), the prongs (14a, 14) being at such a distance (A) from one another, that the inclined surfaces (21a, 21b) are spread when the plug part (S) is inserted by a sealing section (S3) of the plug part (S), which is in front of a collar (S2) of the plug part (S) in the insertion direction (SR).

Description

• - ein Kupplungsteil mit einer Aufnahmeöffnung, in die ein Steckerteil mit einem einen Bund aufweisenden Steckerschaft in einer Einsteckrichtung entlang einer Steckachse einsteckbar ist, und
• - eine radial geschlitzte, zumindest bereichsweise federelastische, vier Rastarme aufweisende Halteklammer, die am Kupplungsteil durch ein radiales Einschieben in einer Einschubrichtung vormontierbar ist, und
  1. a) in einer Vormontage-Stellung eine Einführposition für das Steckerteil einnimmt, in der das Steckerteil durch die Halteklammer in die Aufnahmeöffnung einführbar ist, und
  2. b) in einer Montage-Stellung nach dem Einführen des Steckerteils eine Halteposition für das eingesteckte Steckerteil einnimmt, in der das Steckerteil in der Aufnahmeöffnung mittels der Halteklammer formschlüssig gegen ein Herausziehen blockierbar ist, wobei
  3. c) die Halteklammer von der Grundgestalt her - in Richtung der Steckachse gesehen - U-förmig ausgebildet ist, und die Schenkel des U zwei Paare von jeweils einander diametral gegenüberliegenden Rastarmen ausbilden, die in axialer Richtung hintereinander angeordnet, jeweils durch einen Schlitz voneinander getrennt und in radialer sowie axialer Richtung federelastisch sind, wobei
  4. d) auf einer der Einsteckrichtung des Steckerteils zugewandten Seite des ersten Paares von Rastarmen, das auf einer der Einsteckrichtung des Steckerteils zugewandten Seite der Halteklammer liegt, sich jeweils vordere Schrägflächen befinden, die zum Zusammenwirken mit dem Steckerteil entgegen der Einführrichtung des Steckerteils divergieren.

The invention relates to a connector for hose and / or pipe connections, comprising

• a coupling part with a receiving opening into which a plug part with a plug shank having a collar can be plugged in an insertion direction along a plug axis, and
• - A radially slotted, at least partially resilient, four locking arms having retaining clip, which can be preassembled on the coupling part by radial insertion in an insertion direction, and
  1. a) assumes an insertion position for the plug part in a pre-assembly position, in which the plug part can be inserted through the retaining clip into the receiving opening, and
  2. b) in an assembly position after the insertion of the plug part assumes a holding position for the inserted plug part, in which the plug part can be locked in the receiving opening by means of the retaining clip against being pulled out in a form-fitting manner, wherein
  3. c) the basic shape of the retaining clip - viewed in the direction of the plug-in axis - is U-shaped, and the legs of the U form two pairs of diametrically opposed locking arms which are arranged one behind the other in the axial direction, each separated from one another by a slot and are resilient in the radial and axial directions, with
  4. d) on one side of the first pair of latching arms facing the insertion direction of the plug part, which is on a side of the retaining clip facing the insertion direction of the plug part, there are front inclined surfaces which diverge against the insertion direction of the plug part to interact with the plug part.

Such a connector is for example from WO 2017/067950 A1 known, the technical solution described there providing a connector in which both the pre-assembly process of the retaining clip and the assembly and disassembly process of the plug part are improved compared to the prior art. In particular, the retaining clip can also be secured against loss. The axially one behind the other pairs of spring arms fulfill different functions. The first pair of locking arms fulfills a main function in that it locks the plug part positively against being pulled out in the holding position, and the second pair of locking arms fulfills a secondary function in that it captures the retaining clip in both the pre-assembly position and in the assembly position holds in the coupling part. In the known connector in particular the pre-assembly position and the assembly position of the retaining clip coincide, ie the retaining clip is aligned coaxially to the axis of the coupling part in both positions - pre-assembly position and assembly position.

The first pair of latching arms, which positively blocks the plug part in the holding position against being pulled out and lies on a side of the retaining clip facing the insertion direction of the plug part when the retaining clip is in the insertion position and in the holding position in the coupling part, has in particular one of the Insertion direction of the plug part facing side of the latching arms each have inclined surfaces which diverge against the insertion direction of the plug part to interact with the plug part, namely with its collar. These inclined surfaces located on the side facing the plug-in direction of the plug part can also be referred to as “front inclined surfaces”. The introduction of the plug part into the retaining clip for assembly is facilitated by these front inclined surfaces, since they act as guide surfaces centering the plug part.

When the plug part is plugged in, the plug part collar first encounters these inclined surfaces of the spring arms of the retaining clip, which are preferably formed from chamfered areas, with the retaining clip then being expanded radially by sliding the collar on the inclined surfaces - that is, the spring arms of a pair are pressed outwards against each other - and the plug part behind the front spring arms, which have the inclined surfaces, can snap into place. The spring arms then spring again radially inwards and in this way come to their starting position.

In this case, it is provided in particular that the inclined surfaces are each formed from at least two partial surfaces which have different angles of divergence against the direction of insertion of the plug part. In each case a first sub-area, which is located at the free end of the respective latching arm, advantageously has a smaller divergence angle than the divergence angle of a second sub-area which is located in a central area of the latching arm. The first partial surface pulls in the retaining clip radially before it is spread open, which is particularly important from the point of view that the retaining clip can preferably have clearance for a radial movement in the pre-assembly position. For this purpose, the respective first partial surface in the direction of the coupling opening must be axially upstream of the respective second partial surface in such a way that the collar of the plug part significantly coincides with this first partial surface during insertion - and not yet with the second partial area - cooperates. The retaining collar of the plug part thus first touches the first partial inclined surface and then comes more and more into contact with the second partial inclined surface as the plug part moves forward in the plugging direction. This can be achieved in particular in that the first partial area is at a steeper angle to the central axis than the second partial area located in the central area. In this way, the second partial area becomes effective following the first partial area and spreads the retaining clip radially up to its open position, so that the collar of the plug part can axially pass the first pair of locking arms. The locking arms then spring back radially behind the collar of the plug part and block it against being pulled out. The partial inclined surfaces therefore advantageously split the integral locking arm movement into successive individual movements.

The known connector has proven itself in practice and is now part of the applicant's “VOSS connector system 241N” which is available on the market and which comprises various variants of straight and angled connectors and various retaining clip designs. In all of these variants, after the retaining clip has been inserted into the coupling part, a connection is established by plugging the coupling part and the plug part together, in particular a male plug designed according to the SAE J 2044 standard.

Such a connector part, that is to say a male connector designed according to the SAE J 2044 standard, is shown in FIG WO 2017/067950 A1 also described in detail. The plug part is designed as a hollow cylinder. It has an insertion section, on the outer circumference of which a circumferential collar is arranged. The collar divides the insertion section into a sealing section and a locking section, the sealing section being arranged axially, that is to say on the longitudinal axis of the plug part, in the insertion direction in front of the locking section. In the assembled state, the retaining clip engages behind the collar formed in the SAE connector contour. After the plug has been plugged in, a sealing package is usually seated on the sealing section.

The aforementioned plug-in system is used in automobile construction, in particular in fuel systems and in heated and unheated SCR systems. SCR stands for "selective catalytic reduction" and describes a technology for reducing nitrogen oxides in exhaust gases. In vehicle technology, the SCR process has been used since its introduction in 2004 to reduce nitrogen oxide emissions in diesel vehicles. With the help of this technology, commercial vehicles can meet the Euro 5 standard and cars can meet the very strict American BIN 5 standard and the Euro 6 standard. In the lines of SCR systems, an aqueous urea solution is usually carried, which is called AdBlue in the industry and whose composition is determined by the DIN 70070 or ISO 22241-1 is regulated. This aqueous solution is in front of the SCR catalytic converter in the exhaust system, z. B. by means of a metering pump or injector, injected.

In the sense of making the known connector system more flexible, the invention is based on the object of providing a connector of the type mentioned at the beginning which can be manufactured with a high level of functionality and simplified assembly and disassembly with less effort.

The object is achieved according to the invention by the features of the characterizing part of claim 1. Accordingly, it is provided that the front inclined surfaces are each arranged on radially inwardly - in the direction of the plug-in axis - prongs of the first pair of locking arms - seen in the insertion direction of the retaining clip - below the plug-in axis, the prongs being spaced from one another in such a way that when the plug part is inserted, the front inclined surfaces are spread apart by a sealing section of the plug part which lies in front of a collar of the plug part in the insertion direction.

As in the prior art, the pairs of spring arms lying one behind the other fulfill different functions according to the invention, but the way in which this function is performed differs in detail from the prior art. The pair facing the plug-in direction of the plug part serves to fulfill the main function of establishing the connection, i.e. for radial locking of the plug part, while the pair facing away in the axial direction of the plug-in direction of the plug part serves to fulfill secondary functions.

In that the front inclined surfaces are arranged according to the invention on the radially inwardly directed prongs of the first pair of locking arms below the plug axis and the prongs are designed in such a way that their inclined surfaces do not first - as is known - with the collar of the plug part when inserting the plug part, but already interact with its sealing section, which has a smaller outer diameter than the collar, on the one hand the spreading of the locking arms advantageously begins at an earlier stage of the insertion movement than in the known connector described above. A splitting of the inclined surfaces into at least two partial surfaces each, which have different angles of divergence against the direction of insertion of the plug part, is not necessary. To this extent, the invention reduces Advantageously, the structural complexity compared to the plug connector known from the prior art.

On the other hand, the pre-assembly position and the assembly position of the retaining clip in the connector according to the invention do not have to coincide either, as is known, ie. H. the retaining clip is not aligned coaxially to the axis of the coupling part in its pre-assembly position, but only in its assembly position. When inserting the plug part, the retaining clip does not primarily act - as is known - in a centering manner on the plug part, but the retaining clip is moved from its eccentric and thus advantageously optically easily recognizable preassembly position by the plug part radially inward towards its assembly position. The front part of the connector ensures a partial movement towards the assembly position.

In an advantageous embodiment of the invention it can also be provided that on a side facing away from the insertion direction of the plug part of the prongs of the first pair of latching arms there are rear inclined surfaces which converge against the insertion direction of the plug part to interact with the collar of the plug part. The rear inclined surfaces, which, like the front inclined surfaces, can advantageously be designed as chamfers, serve to enable the plug part to be easily released again for dismantling or to be pulled out of the clamp. They cause the first pair of spring arms to spread open when the plug part moves backwards, that is when it moves against the direction of insertion.

To the extent that the spring arms lock or the locking arms spring, the terms “locking arm” and “spring arm” are used synonymously according to the application.

To lock the retaining clip, the spring arms of the second pair of spring arms, which in the insertion position and in the retaining position of the retaining clip, faces away from an end wall of the coupling part facing the insertion direction of the plug part, can preferably each have cams inwards at the free ends of the spring arms , against each other, pointed tips are located. When the mounting clip is finally pushed radially into the coupling part, these rear spring arms can be pushed apart via inclined surfaces, preferably located on the cams of the rear spring arms, and deflected radially to such an extent that they slide past a blocking element of the coupling part on both sides and then behind after a radial inward springing - or can reach under. An additional locking part is not necessary. The blocking element of the coupling part can have complementary holding contours to interact with the cams of the second pair of spring arms, which can also advantageously be designed as holding projections on the blocking element, specifically on both sides. As a further secondary function of the second pair of spring arms, it can be provided to prevent the clamp from being locked without a plug part, which can be achieved by a special design of the cams and will be explained in detail below in the context of the description of the preferred embodiment.

The entire retaining clip can be made in one piece in a simple design in terms of manufacturing technology, in particular advantageously as an injection molded part made of plastic, in that its basic shape - viewed in the direction of the longitudinal axis - is in particular U-shaped. The legs of the U form two pairs of diametrically opposite spring arms, d. H. so a total of four spring arms. The pairs of spring arms are arranged one behind the other in the axial direction and the spring arms lying axially one behind the other are each separated by a slot. As a result, the spring arms can be compressed in the axial direction during the pre-assembly of the retaining clip and also for disassembly. On the radially outer side of the legs of the U there can advantageously be a corrugated area for manual action for dismantling.

The coupling part can comprise a base body, in particular designed as a socket part, and a receiving body, in particular ring-shaped in its basic shape, for the retaining clip, which can be connected to one another or are connected to one another in the assembled state, preferably via a material connection, such as laser welding. Like the retaining clip, the coupling part or its parts can also be designed as injection-molded molded parts made of plastic in a simple design in terms of manufacturing technology.

In the coupling part, in particular in its base body, a sealing package can be arranged which preferably comprises two sealing rings, in particular elastomeric O-rings, and a spacer ring between them.

In a preferred embodiment of the connector according to the invention it can be provided that in each case on the spring or latching arms of the pair, which in the insertion position and in the holding position of the retaining clip, faces an end wall of the coupling part facing the insertion direction of the plug part, each other, in particular in a central one Area of the spring arms, guide pins to engage in complementary guide slots of the Coupling part are located. With these guide pins of the retaining clip located in the slot guide contour of the coupling part, in particular in its retaining clip receptacle formed by the receiving body, the retaining clip can advantageously be guided during the assembly sequence of movements in the connector according to the invention and secured against twisting about the plug part plug axis .

The end wall facing the direction of insertion of the plug part is also referred to below as the front end wall and the pair of spring arms facing this end wall is referred to as the front pair, while the end wall of the receiving body for the retaining clip facing away from the direction of insertion of the plug part is also referred to as the rear end wall and that of this end wall facing spring arm pair is referred to as the rear pair.

In the system mentioned at the beginning, in which the invention can be used, high demands are made on the heatable fluid lines in particular, which result from the load conditions. These requirements relate in particular to the possible occurrence of high temperatures, which can occur at certain points in the system or lines, for example. B. in a range from 140 ° C to 180 ° C, for a short time even in the range up to 200 ° C. Furthermore, the occurrence of high absolute pressures is to be expected, which are in the standard range from 5 bar to 10 bar, sometimes also in the range up to 15 bar. Pressure pulsations can occur that have to be compensated for, as well as changes in volume that are associated, for example, with freezing in frosty conditions and with re-thawing of the fluid. With regard to the size of the load, this is referred to as the line's so-called ice compressive strength. A connector according to the invention is advantageously able to meet these requirements.

Further advantageous refinements of the invention emerge from the following description of the figures and the dependent claims.

• 1 eine perspektivische dreidimensionale Einzelteildarstellung eines erfindungsgemäßen Steckverbinders, einschließlich eines genormten Steckerteils in der Draufsicht,
• 2 eine perspektivische dreidimensionale Darstellung einer bevorzugten Ausführungsform einer Halteklammer eines erfindungsgemäßen Steckverbinders, mit Blick auf die Vorderseite,
• 3 eine perspektivische dreidimensionale Darstellung einer bevorzugten Ausführungsform einer Halteklammer eines erfindungsgemäßen Steckverbinders, mit Blick auf die Rückseite,
• 4 eine Stirnansicht des erfindungsgemäßen Steckverbinders im Vormontagezustand,
• 5 in etwas verkleinertem Maßstab gegenüber 4, den in 4 dargestellten erfindungsgemäßen Steckverbinder in der Seitenansicht,
• 6 einen Querschnitt durch den erfindungsgemäßen Steckverbinder in der Ebene A-A gemäß 5,
• 7 einen weiteren Querschnitt durch den erfindungsgemäßen Steckverbinder mit einer Position des Steckerteils bei seinem Einführen wie in 8,
• 8 eine Stirnansicht des erfindungsgemäßen Steckverbinders, ähnlich wie in 4, jedoch beim Einführen des Steckerteils,
• 8a einen Längsschnitt durch den erfindungsgemäßen Steckverbinder in der Schnittebene A-A gemäß 8,
• 9 einen Querschnitt durch den erfindungsgemäßen Steckverbinder in der Ebene D-D gemäß 10,
• 10 in etwas verkleinertem Maßstab gegenüber 9, den in 9 dargestellten erfindungsgemäßen Steckverbinder in der Seitenansicht,
• 11 einen Querschnitt durch den erfindungsgemäßen Steckverbinder in der Ebene A-A gemäß 12,
• 12 in etwas verkleinertem Maßstab gegenüber 11, den in 11 dargestellten erfindungsgemäßen Steckverbinder in der Seitenansicht,
• 13 einen Querschnitt durch den erfindungsgemäßen Steckverbinder im Montagezustand, geschnitten in einer Ebene, die durch das zweite Federarmpaar verläuft,
• 14 eine Stirnansicht des erfindungsgemäßen Steckverbinders, ähnlich wie in 4 und 8, jedoch im Montagezustand, und
• 15 eine perspektivische dreidimensionale Darstellung des erfindungsgemäßen Steckverbinders im Montagezustand mit Blick auf die Stirnseite,
• 16 eine Unteransicht des erfindungsgemäßen Steckverbinders in einem Zwischen-Montagezustand zur Veranschaulichung einer weiteren Variante der Druckverriegelung des Steckerteils.

Show it:

• 1 a perspective three-dimensional detail representation of a connector according to the invention, including a standardized connector part in plan view,
• 2 a perspective three-dimensional representation of a preferred embodiment of a retaining clip of a connector according to the invention, with a view of the front side,
• 3 a perspective three-dimensional representation of a preferred embodiment of a retaining clip of a connector according to the invention, with a view of the rear,
• 4th an end view of the connector according to the invention in the pre-assembly state,
• 5 on a slightly reduced scale opposite 4th , the in 4th shown connector according to the invention in side view,
• 6th a cross section through the connector according to the invention in the plane AA according to 5 ,
• 7th a further cross section through the connector according to the invention with a position of the plug part during its insertion as in FIG 8th ,
• 8th an end view of the connector according to the invention, similar to FIG 4th , but when inserting the plug part,
• 8a a longitudinal section through the connector according to the invention in the section plane AA according to 8th ,
• 9 a cross section through the connector according to the invention in the plane DD according to 10 ,
• 10 on a slightly reduced scale opposite 9 , the in 9 shown connector according to the invention in side view,
• 11 a cross section through the connector according to the invention in the plane AA according to 12th ,
• 12th on a slightly reduced scale opposite 11 , the in 11 shown connector according to the invention in side view,
• 13 a cross-section through the connector according to the invention in the assembled state, cut in a plane which runs through the second pair of spring arms,
• 14th an end view of the connector according to the invention, similar to FIG 4th and 8th , but in the assembled state, and
• 15th a perspective three-dimensional representation of the connector according to the invention in the assembled state with a view of the end face,
• 16 a bottom view of the connector according to the invention in an intermediate assembly state to illustrate a further variant of the pressure locking of the plug part.

In the various figures of the drawing, the same parts are always provided with the same reference numerals and are therefore usually only described once below. In the sense of For better clarity, however, not all parts are designated with their reference numerals in all figures of the drawing.

In relation to the following description, it is claimed that the invention is not limited to the exemplary embodiments and thereby not to all or several features of the described feature combinations; rather, each individual partial feature of the / each exemplary embodiment is also detached from all other partial features described in connection therewith also in combination with any features of another embodiment of importance for the subject matter of the invention.

1 shows a detail view of an advantageous embodiment of a connector according to the invention 1 For connecting a connector part S designed as a pipe socket, in particular an SAE J 2044 male connector. Such a plug S is also - in parallel position with the plug connector according to the invention 1 - in 1 shown.

The plug part S has an insertion section S1 on, on the outer circumference of a circumferential collar S2 with opposite the rest of the insertion section S1 (Base diameter D1 ) enlarged diameter D2 is arranged. The plug part S is designed as a hollow cylinder. The Bund S2 divides the male section S1 into a sealing section S3 and a locking portion S4 , wherein the sealing portion S3 axially (longitudinal axis XX) in the direction of insertion SR in front of the locking section S4 is arranged. Sealing section S3 and locking section S4 are - apart from a minimal difference provided for by the standard - almost identical in diameter (base diameter D1 of the insertion section S1 . The diameter in the range of S4 is slightly larger according to the standard.) On the sealing section S3 after plug S is plugged in, there is a seal package 11 , as exemplified in 1 is shown.

The connector 1 comprises a coupling part 2 and an at least partially resilient retaining clip 3 .

The coupling part 2 has a base body, in particular designed as a socket part 4th and a receiving body, in particular one which is annular in its basic shape 5 for the retaining clip 3 , which can be connected to one another, preferably via a material connection, such as by laser welding. On the receiving body 5 is a connectivity approach to this end 6th intended. The basic body 4th and / or the receiving body 5 can advantageously be designed as injection molded parts made of plastic.

The coupling part 2 can be connected on one side in particular to a fluid line (not shown). For this purpose is on the base body 4th a connection section 7th educated. A media line to be connected can in particular be designed as a hose or pipe.

The basic body 4th of the coupling part 2 is designed as a connector piece, in the illustrated case as an angled connector piece, to enable heating, which forms the connection section 7th for connecting the fluid line and a heating section 8th has, in which - not shown - electrical heating means in a the coupling part 2 at least partially enclosing arrangement can be provided. The electrical heating means, in particular heating conductors, can be placed on the outside of the coupling part 2 be applied, including on the jacket in the area of the heating section 8th of the coupling part 2 Guide elements 9 , in particular helical guide elements 9 are arranged or formed. The entire coupling system can of course also be used with unheated lines.

On the connection section 7th for the side opposite the media line, the coupling part 2 a receiving opening 10 for inserting the plug part S.

To seal the plug connection is in the coupling part 2 , in its main body 4th , a seal package 11 arranged. The sealing package 11 preferably comprises two O-rings 12th and a spacer ring therebetween 13 .

The retaining clip 3 (Individual representation in 2 and 3 ) is on the coupling part 2 can be pre-assembled and, after being inserted in the assembly direction M, takes the in 4th to 6th A pre-assembly position shown, which represents the insertion position for the plug part S. Without the plug part S being inserted, the retaining clip 3 cannot be transferred to the assembly position, which is in 13 to 15th is shown.

As in particular the individual part representations in 2 and 3 can show the retaining clip 3 preferably in one piece, in particular as an injection molded part made of plastic.

The retaining clip 3 is in particular from the basic shape - in the direction of the longitudinal axis XX of the connector 1 seen - U-shaped, with the legs of the U two pairs 15a / 15b , 16a / 16b by diametrically opposed spring arms 15a , 15b , 16a , 16b form. The spring arms 15a , 15b , 16a , 16b form resilient areas of the retaining clip 3 . The legs of the U are through a radial slot 17th Cut. Under "slot 17" is the entire, the interior of the U, surrounding the plug axis XX, between the spring arms 15a and 15b as well as the spring arms 16a and 16b understood the intermediate space.

The couples 15a / 15b , 16a / 16b the spring arms 15a , 15b , 16a , 16b are arranged one behind the other in the axial direction XX and also from one another through a slot 18th , but through an axial slot 18th , Cut. The retaining clip 3 is designed symmetrically with respect to a longitudinal axis YY running through it.

Through the connection area 19th the leg of the U, the one rigid area of the at least partially resilient retaining clip 3 can represent is on the free ends of the spring arms 15a , 15b , 16a , 16b remote side an actuating surface 20th for the retaining clip 3 formed, via which a manual radial insertion (arrow M) of the retaining clip 3 in the coupling part 2 can be done.

That in the axial direction XX of the insertion direction SR of the plug part S facing, front pair 15a / 15b the locking arms 15a , 15b , 16a , 16b serves primarily to fulfill the main function of establishing the connection, i.e. it provides the locking arms 15a , 15b ready for radial locking of the plug part S, while that in the axial direction XX of the insertion direction SR of the plug part S facing away, rear pair 16a / 16b primarily to fulfill the secondary function according to the invention of locking the retaining clip 3 is used in its holding position. This locking is - as already mentioned - in particular by 13 illustrated.

How in particular 2 shows are located on the spring arms 15a , 15b of the front pair 15a / 15b on one of the insertion direction SR of the plug part S facing side, in particular at least in a central area of the spring arms 15a , 15b , Sloping surfaces 21a , 21b who are to cooperate with the federal government S2 of the plug part S against the direction of insertion SR of the plug part S diverge.

According to the invention it is provided that these front inclined surfaces 21a , 21st b in each case on teeth directed radially inwards - in the direction of the plug-in axis XX 14a , 14b of the first couple 15a / 15b of locking arms 15a , 15b , 16a , 16b - in the direction of insertion M of the retaining clip 3 seen and as shown in the drawing - are arranged below the plug-in axis XX, the prongs 14a , 14b are so spaced from each other (distance A in 4th ) that the front sloping surfaces 21a , 21b when inserting the plug part S from a sealing section S3 of the plug part S, in the direction of insertion SR in front of a covenant S2 of the plug part S is to be spread.

In addition, it is advantageously provided that on the direction of insertion SR of the plug part S facing away from the side of the prongs 14a , 14b of the first couple 15a / 15b of locking arms 15a , 15b , 16a , 16b each rear sloping surfaces 22a , 22b to cooperate with the federal government S2 of the plug part S against the direction of insertion SR of the plug part S converge. In this way the locking arms 15a , 15b even if the plug part S is pulled out (opposite to the insertion direction SR ) spread. These rear sloping surfaces 22a , 22b can be complementary to the front inclined surfaces in a simple manner 21a , 21b , so on the prongs 14a , 14b mirror image, be formed or - as in particular from 8a can be seen - have a steeper course towards the longitudinal axis XX.

It is also provided that each of the spring arms 15a , 15b of the front pair 15a / 15b of spring arms 15a , 15b , especially in a central area of the spring arms 15a , 15b , Guide pin 23a , 23b to engage in complementary guide slots 24a , 24b of the coupling part 2 are located.

The interaction of the guide pins 23a , 23b with the guide slots 24a , 24b is special 4th , 14th and 15th can be seen clearly. In the coupling part 2 , especially in its receiving body 5 for the retaining clip 3 , these are located when engaging the on the front spring arms 15a , 15b the retaining clip 3 located complementary guide pin 23a , 23b guide slots acting as a control contour 24a , 24b on the direction of insertion SR of the plug part S facing the end wall 29 of the coupling part 2 . The guide slots 24a , 24b are each elongated holes with two kink angles K1 , K2 . Their shape can also be characterized by the shape of a stylized lightning bolt. The guide slots 24a , 24b run due to their two break points K1 , K2 first in a first section radially outwards, then in a second section radially inwards and finally in a third section again radially outwards.

Especially 3 , and also 6th , 7th and 11 can be seen that each is attached to the spring arms 16a , 16b of a rear pair 16a / 16b of spring arms 16a , 16b , in particular on both sides of a connection area 19th or in the connection area 19th in which the spring arms 15a , 15b , 16a , 16b are connected to each other, like a secant to the coupling part 2 directed longitudinal guide webs 25a , 25b to the Cooperating with one between the longitudinal guide webs 25a , 25b centrally arranged complementary guide contour 26th in one of the insertion direction SR of the plug part S facing away from the end wall of the coupling part 2 are located.

Out 2 , 3 , 6th , 11 and 13 it is also clear that on the spring arms 16a , 16b of the rear pair 16a / 16b of spring arms 15a , 15b , 16a , 16b , facing away from the direction of insertion of the plug part S, cams at the free ends 27a , 27b are formed with inwardly, against each other, pointed tips and an, in particular flat, base surface GF.

The coupling part 2 forms, in particular through its receiving body 5 for the retaining clip 2 , a hollow cylindrical from the basic shape, on the respective end walls 29 , 30th of the hollow cylinder each closed housing or a cage for the retaining clip 3 (please refer 1 as 4th to 15th ). It has circumferential openings on two diametrically opposite sides 31 , 32 for reaching through the retaining clip 3 , in particular an insertion opening 31 (in the figurative representations above) and an outlet opening 32 (in each of the figurative representations below).

Furthermore show in particular 1 , 6th , 11 and 13 that is in the coupling part 2 , especially in the middle in the area of the outlet opening 32 of the receiving body 5 of the coupling part 2 , a blocking element 33 each with a counter contour 34a , 34b for the stop of the flat base surfaces of the spring arms 16a , 16b of the cams arranged at the end 27a , 27b is located (see 6th ). The cams 27a , 27b and the contours 34a , 34b represent - as mentioned - also releasable locking means of the rear spring arms 16a , 16b the retaining clip 3 , insofar as they have a non-positive and positive connection between the retaining clip 3 and the coupling part 2 can train how this in 13 is shown. Thus the rear spring arms have 16a , 16b two secondary functions - once as a barrier and once as a spacer.

For mounting the connector according to the invention 1 is initially (see 1 ) the sealing package 11 and then the receiving body 5 in the main body 4th of the coupling part 2 used. Then become the main body 4th and the receiving body 5 - e.g. B. by laser welding - in particular firmly bonded together.

After that, the retaining clip 3 in the coupling part 2 inserted (each arrow M in 1 and 4th ) so that the in 4th to 6th The pre-assembly state shown is created. The retaining clip 3 is initially transverse to the direction of insertion SR of the plug part S through the insertion opening 31 out what by optionally available (not designated) lead-in bevels on the receiving body 5 of the coupling part 2 can be facilitated. For inserting the retaining clip 3 are their spring arm pairs 15a / 15b , 16a / 16b axially pressed against each other, what through the slot 18th is made possible. Jamming or tilting of the retaining clip 3 in the coupling part 2 can advantageously be avoided in so far as the longitudinal guide webs 25a , 25b on both sides of the complementary guide contour arranged centrally between them 26th of the coupling part 2 slide along.

The retaining clip 3 In principle, however, it can also be done before the base body is connected, for example by welding 4th and receiving body 5 to be assembled.

Then the spring arm pairs 15a / 15b , 16a / 16b relieved of pressure so that the guide pin 23a , 23b the front spring arms 15a , 15b for engaging the complementary guide slots 24a , 24b come ( 4th ). The guide pins 23a , 23b the spring arms 15a , 15b hit in the guide slots 24a , 24b end at the top, so that a return movement of the retaining clip 3 is blocked. The retaining clip 3 stands over the outer circumference of the coupling part 2 emerged.

As 4th to 6th may illustrate while trying to remove the retaining clip 3 without plugged in connector S (connector S is in 4th and 6th not shown in section) further in the assembly direction M into the coupling part 2 to press in the retaining clip 3 which, although it has a play for radial movement, cannot be moved up to a lock, since it is with its rear arms 16a , 16b at the lower end on the respective mating contour 34a , 34b of the blocking element 33 rests (by a circle at the bottom right in 6th marked). The rear spring arms meet here 16a , 16b their function of spacing. At the same time, those in the guide slots 24a , 24b of the coupling part 2 guided tenon 23a , 23b the front arms 15a , 15b when actuated (arrow M) a little sideways to the first kink point K1 deflected towards (arrows L in 4th ) what happens when you let go of the retaining clip 3 provides a restoring force, ie the retaining clip 3 is moved back to its pre-assembly position, in which its center axis is not, as in the assembly position coaxial ( 13 ), but eccentric to the center axis XX of the coupling part 2 (and of the plug part S).

In the pre-assembly position there is no locking of the retaining clip 3 , however, this is due to the front engagement of their tenons 23a , 23b into the guide slots 24a , 24b of Coupling part 2 as well as through the interaction of the longitudinal guide webs on the rear 25a , 25b with the complementary guide contour arranged centrally between them 26th of the coupling part 2 Sufficiently secured for a captive holder.

7th as 8th and 8a illustrate what happens when the plug part S is plugged in. This is where the retaining clip 3 by the interaction (arrows N) of the sealing section S3 of the plug part S with the front sloping surfaces 21a , 21b the point 14a , 14b of the first couple 15a / 15b of locking arms 15a , 15b spread apart, so radially expanded, and further into the coupling part 2 drawn in, which is also due to the movement of the tenons 23a , 23b (Arrows O in 8th ) is illustrated. The plug part S is in 7th while in the area of the sealing section S3 , in 8th in the area of the locking section S4 and in 8a shown in longitudinal section. The figures represent an "unsecured" state in which the federal government S2 of the plug part S between the axial arm pairs 15a / 15b , 16a / 16b the retaining clip 3 , i.e. in the axial slot 18th , lies.

When the plug part S is inserted further, the collar also comes S2 of the connector part S - but above the inclined surfaces 21a , 21b - in contact with the retaining clip 3 (Arrows P in 9 ). The connection between the plug part S and the connector part 1 is not yet completed after the plugging process, insofar as the plug part S is still out of the retaining clip 3 can be pulled out again.

While the 7th to 10 primarily on the role of the front locking arms 15a , 15b refer to assembly, illustrate the 11 to 13 especially what role the rear locking arms 16a , 16b play during assembly. The sectional view in 11 corresponds - from a different perspective - to the assembly state in 7th . The rear pair of locking arms 16a / 16b the retaining clip 2 has - as already partially explained above in the explanation of the structural design - two functional areas. One of these functional areas is through the cams 27a , 27b educated. Without an inserted plug part S, these strike with their respective base GF against the top of the blocking element - as already explained 33 ( 6th ) and act as a locking device in the assembled state by pressing the blocking element 33 , especially in the area of its mating contours 34a , 34b , reach under ( 13 ).

The second - previously unmentioned - functional area of the rear locking arms 16a , 16b is located in a central area above the cams 27a , 27b and is by respective, radially inwardly directed bulges 28a , 28b formed, the tips of which are in the pre-assembly position - if not (as according to 6th ) a pressure in the direction of insertion M of the retaining clip 3 is exercised - are located above the quick-release axle XX. The tips of the bulges 28a , 28b interact with the collar when the plug part S is inserted S2 same, so that also the rear locking arms 16a , 16b to expand the retaining clip 3 contribute (arrows Q in 11 ). The retaining clip 3 is successively expanded twice during assembly - first through the sealing section S3 of the plug part S on the front inclined surfaces 21a , 21b the point 14a , 14b of the front locking arms 15a , 15b ( 7th and 8th ), then by the federal government S2 of the plug part S at the bulges 28a , 28b of the rear locking arms 16a , 16b ( 11 ).

In order to complete the assembly - which can also be referred to as an "assembly confirmation" process - after the expansion through the bulges 28a , 28b the retaining clip 3 in their direction of insertion M further into the coupling part 2 slide in until they finally reach the final mounting position ( 13 and also 14th and 15th ) reached. This can be done by manually pressing the actuation surface 20th be effected. The connector is now functional. Depending on the tolerance, it may not be sufficient to "only" plug in the plug part S completely, then it has to be pushed over a little so that the collar S2 of the plug part 1 the free ends of the front arm pair lying underneath in the insertion direction M 15a / 15b spreads.

In the assembly position, the retaining clip closes 3 with the outer circumference 15th of the coupling part 2 flush with almost no protrusion. This indicates that the locked assembly state has been reached. In addition, when the locked assembly state has been reached, this is also indicated by the fact that the guide pins 23a , 23b the spring arms 15a , 15b in the guide slots 24a , 24b in the area of the second bend angle K2 reside like this 14th and 15th can be found. The prongs 14a , 14b of the front locking arms 15a , 15b are located according to 14th below the plug part S, in particular below its collar S2 .

To press the retaining clip further 3 To prevent in the assembly direction M, it can be provided in an advantageous manner that on the free ends of the spring arms 15a , 15b , 16a , 16b facing away from the retaining clip 3 , especially on both sides and preferably on all arms 15a , 15b , 16a , 16b , one stop approach each 35a , 35b is formed, which in the assembled state with its underside on both sides of the insertion opening 31 of the coupling part 2 on the wall of which comes into contact (arrow R in 15th ). The retaining clip 3 is thus supported in the assembled state against the Receiving body 5 of the coupling part 2 from. The one below the second break point K2 lying section of the guide slots 24a , 24b of the coupling part 2 thus becomes inoperative.

To release the plug connection 1 / S must be the retaining clip 3 initially a little against their mounting direction M (arrows S in 15th ) - namely in their eccentric or radially offset position to the center axis XX of plug part S and connector part ( 7th to 10 ), which can also be called the open or opened position - from the coupling part 2 be pulled out before the plug part S back out of the connector part 1 can be removed. This extraction (arrows S) is preferably done manually. The retaining clip 3 can for this purpose advantageously on the free ends of the spring arms 15a , 15b , 16a , 16b facing away, in particular on both sides and preferably on all arms 15a , 15b , 16a , 16b , a handle structure 36a , 36b have in particular a corrugated contour. This grip structure 36a , 36b can preferably be based on the stop approaches described above 35a , 35b are located.

The invention is not limited to the illustrated and described exemplary embodiment, but also includes all embodiments that have the same effect within the meaning of the invention. It is also expressly emphasized that the exemplary embodiment is not limited to all of its features in combination; rather, each individual partial feature can also have an inventive significance in isolation from all other partial features.

Further technical measures can also be provided without departing from the scope of the invention.

For example, show 2 and 3 that through or on the front sloping surfaces 21a , 21b and rear bevels 22a , 22b Gusset surfaces 37a , 37b are trained. These are the direction of insertion M of the retaining clip 3 facing and act with the connector sections S3 and S4 together, whereby they allow easy radial displacement of the retaining clip 3 to care.

Furthermore, the front inclined surfaces can 21a , 21b and rear bevels 22a , 22b as chamfers not only over the area of the prongs 14a , 14b , but also up to the free ends of the front locking arms 15a , 15b stretch through like this as well 2 and 3 is illustrated. This also advantageously facilitates the assembly and disassembly of the plug part S.

Out 16 go details of another - in addition to locking by means of the rear pair of locking arms 16a / 16b possible - variant for pressure locking the plug part S - by means of the front locking arms 15a , 15b the retaining clip 3 caused - in the coupling part 2 emerged. It was already clear above that - when the plug part S is in the coupling part 2 is inserted - the sections S3 , S2 and S4 of the plug part S successively the prongs 14a , 14b the retaining clip 3 touch. This will release the bracket 3 initially pulled in slightly in the direction of insertion M, and her front pair of locking arms 15a , 15b is expanded radially and slightly in the plugging direction SR relocated. Through this movement of the locking arms 15a , 15b are used for the pressure lock, on one of the insertion direction SR of the plug part S facing side locking cams 38a , 38b from corresponding grooves 39a , 39b of the coupling part 2 steered out. If the plug part S is now back against the plug direction SR from the coupling part 2 pulled out, the covenant expands S2 of the plug part S the locking arm pair 15a / 15b over the rear sloping surfaces 22a , 22b the point 14a , 14b back on. This is possible because of the beveled faces 22a , 22b over the prongs 14a , 14b away to the locking cams 38a , 38b extend to pressure lock. Only when the retaining clip 3 is shifted into its final assembly position, the locking cams are 38a , 38b again in the corresponding grooves 39a , 39b . If pressure is then given to the system by the fluid in the working state, the locking cams are advantageously 38a , 38b even stronger in the grooves 39a , 39b pressed.

Furthermore, the invention has not yet been restricted to the combination of features defined in claim 1, but can also be defined by any other combination of specific features of all of the individual features disclosed. This means that in principle practically every single feature of claim 1 can be omitted or replaced by at least one single feature disclosed elsewhere in the application.

QUOTES INCLUDED IN THE DESCRIPTION

This list of the documents listed by the applicant was generated automatically and is included solely for the better information of the reader. The list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions.

Patent literature cited

• WO 2017/067950 A1 [0002, 0007]

Non-patent literature cited

• DIN 70070 [0008]

Claims (16)

Plug connector (1) for hose and / or pipe connections, comprising - a coupling part (2) with a receiving opening (10) into which a plug part (S) with a plug shank (S1) having a collar (S2) in an insertion direction (SR ) can be inserted along a plug axis (XX), and - a radially slotted (17), at least partially resilient, four locking arms (15a, 15b, 16a, 16b) having retaining clip (3), which is attached to the coupling part (2) by radial insertion can be preassembled in an insertion direction (M) and a) in a preassembly position, the plug part (S) assumes an insertion position in which the plug part (S) can be inserted through the retaining clip (3) into the receiving opening (10), and b ) in a mounting position after the insertion of the plug part (S) assumes a holding position for the inserted plug part (S), in which the plug part (S) can be positively locked against being pulled out in the receiving opening (10) by means of the retaining clip (3) , where c) the basic shape of the retaining clip (3) - viewed in the direction of the plug-in axis (XX) - is U-shaped, and the legs of the U have two pairs (15a / 15b, 16a / 16b) of diametrically opposed locking arms ( 15a, 15b, 16a, 16b) which are arranged one behind the other in the axial direction (XX), each separated from one another by a slot (18) and are resilient in the radial and axial (XX) directions, with d) on one of the insertion direction (SR ) of the plug part (S) facing side of the first pair (15a / 15b) of latching arms (15a, 15b), which is on a side of the retaining clip (3) facing the insertion direction (SR) of the plug part (S), there are front inclined surfaces (21a, 21b) which diverge against the insertion direction (SR) of the plug part (S) for interaction with the plug part (S), characterized in that the front inclined surfaces (21a, 21b) each point radially inwards - towards the quick-release axle (XX) backwards chteten prongs (14a, 14b) of the first pair (15a / 15b) of locking arms (15a, 15b) - viewed in the insertion direction (M) of the retaining clip (3) - are arranged below the plug axis (XX), the prongs (14a, 14b) have such a distance (A) from one another that the front inclined surfaces (21a, 21b) when inserting the plug part (S) from a sealing section (S3) of the plug part (S), which in the insertion direction (SR) in front of a collar (S2 ) of the plug part (S) is to be spread. Connector (1) Claim 1 , characterized in that on a side of the prongs (14a, 14b) of the first pair (15a / 15b) of latching arms (15a, 15b) facing away from the insertion direction (SR) of the plug part (S) there are respective rear inclined surfaces (22a, 22b) that converge to interact with the collar (S2) of the plug part (S) against the insertion direction (SR) of the plug part (S). Connector (1) Claim 1 or 2 , characterized in that the pre-assembly position and the assembly position of the retaining clip (3) offset from one another and aligned with the axis (XX) of the coupling part (2), the retaining clip (3) in the pre-assembly position preferably having a play for has a radial movement. Connector (1) according to one of the Claims 1 to 3 , characterized in that the retaining clip (3) is formed in one piece, in particular as an injection molded part made of plastic and preferably symmetrical with regard to a longitudinal axis (YY) running through it. Connector (1) according to one of the Claims 1 to 4th , characterized in that in the - viewed in the direction of the longitudinal axis (XX) - from the basic shape U-shaped retaining clip (3) through the connecting area (19) of the legs of the U on the the free ends of the locking arms (15a, 15b , 16a, 16b) facing away from the side an actuating surface (20) for the retaining clip (3) is formed. Connector (1) according to one of the Claims 1 to 5 , characterized in that in each case on the locking arms (15a, 15b) of the pair (15a / 15b) of locking arms (15a, 15b), which in the insertion position and in the holding position of the retaining clip (3) one of the insertion direction (SR) of the plug part (S) facing the end wall (29) of the coupling part (2), in particular in a central area of the locking arms (15a, 15b), guide pins (23a, 23b) for engaging in complementary guide slots (24a, 24b) of the coupling part ( 2) are located. Connector (1) according to one of the Claims 1 to 6th , characterized in that each of the locking arms (16a, 16b) of a pair (16a / 16b) of locking arms (16a, 16b), the one of the insertion direction (SR) of the plug part (S) facing the end wall (29) of the coupling part ( 2), longitudinal guide webs (25a, 25b) or longitudinal guide steps for interacting with at least one complementary guide (26) are located in an end wall of the coupling part (2) facing away from the insertion direction (SR) of the plug part (S) . Connector (1) Claim 7 , characterized in that the secant-like to the coupling part (2) directed longitudinal guide webs (25a, 25b) or longitudinal guide steps on both sides of a / the connecting area (19) or in one / the Connection area (19) in which the locking arms (15a, 15b, 16a, 16b) are connected to one another, are arranged. Connector (1) according to one of the Claims 1 to 8th , characterized in that for locking the retaining clip (3) on the locking arms (16a, 16b) of the pair (16a / 16b) of locking arms (16a, 16b), which in the insertion position and in the holding position of the retaining clip (3) one facing away from the insertion direction (SR) of the plug part (S) facing the end wall (29) of the coupling part (2), at the free ends of the locking arms (16a, 16b) each cams (27a, 27b) with inwardly directed tips and a, in particular flat, base. Connector (1) according to one of the Claims 1 to 9 , characterized in that to interact with the collar (S2) of the plug part (S) on the latching arms (16a, 16b) of the pair (16a / 16b) of latching arms (16a, 16b), which in the insertion position and in the holding position of the retaining clip (3) facing away from an end wall (29) of the coupling part (2) facing the insertion direction (SR) of the plug part (S), there are bulges (28a, 28b) directed radially inward in a central region. Connector (1) according to one of the Claims 1 to 10 , characterized in that the coupling part (2) comprises a base body (4), in particular designed as a sleeve part, and a receiving body (5) for the retaining clip (3), in particular ring-shaped in its basic shape, which, preferably via a cohesive connection , such as by laser welding, can be connected to one another or are connected to one another in the assembled state, in particular the base body (4) and / or the receiving body (5) being designed as injection-molded molded parts made of plastic. Connector (1) according to one of the Claims 1 to 11 , characterized in that the coupling part (2), in particular through its receiving body (5) for the retaining clip (2), a hollow-cylindrical housing for the retaining clip (2) which is hollow in its basic shape and which is closed on the respective end walls (29, 30) of the hollow cylinder. 3), which on two diametrically opposite sides has circumferential openings (31, 32) for the retaining clip (3) to reach through, in particular an insertion opening (31) and an exit opening (32). Connector (1) according to one of the Claims 1 to 12th , characterized in that in the coupling part (2), in particular in the center in the area of the outlet opening (32) of the receiving body (5) of the coupling part (2), there is a blocking element (33) each with a counter contour (34a, 34b) for the interaction with cams (27a, 27b) arranged at the ends of locking arms (16a, 16b), the mating contours (34a, 34b) with the cams (27a, 27b) in the assembly position creating a non-positive and positive connection between the retaining clip (3 ) and the coupling part (2) and the blocking element (33) with the mating contours (34a, 34b) forms a stop for the cams (27a, 27b) in the pre-assembly position. Connector (1) according to one of the Claims 1 to 13 , characterized in that on the side of the retaining clip (3) facing away from the free ends of the locking arms (15a, 15b, 16a, 16b), in particular on both sides and preferably on all locking arms (15a, 15b, 16a, 16b), there is a respective stop ( 35a, 35b) which, in the assembled state, comes to rest with its underside on both sides of an insertion opening (31) of the coupling part (2) on its wall. Connector (1) according to one of the Claims 1 to 14th , characterized in that on the side of the retaining clip (3) facing away from the free ends of the latching arms (15a, 15b, 16a, 16b), in particular on both sides and preferably on all latching arms (15a, 15b, 16a, 16b), a handle structure ( 36a, 36b) is designed with, in particular, a corrugated contour for manual action to pull the retaining clip (3) out of its assembly position. Connector (1) according to one of the Claims 1 to 15th , characterized in that on the sides of the first pair (15a / 15b) of latching arms (15a, 15b) facing the insertion direction (SR) of the plug part (S), locking cams (38a, 38b) serving to engage in corresponding grooves (39a) for a pressure lock , 39b) of the coupling part (2) are formed.

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