Plug-type connector for media lines

Abstract

A plug-type connector for media lines having a coupling part into which a plug part can be inserted. The plug part can be retainingly engaged in the coupling part by a retaining clip that has at least two pairs of spring arms. The clip can be premounted on the coupling part by latching of the spring arms. The clip is U-shaped wherein legs of the U-shape form the two pairs of spring arms, which pairs are arranged one behind the other in the longitudinal direction and are separated by a slot and are elastic in the radial and axial directions. The first pair of the spring arms interlockingly blocks the plug part against being pulling out of the coupling part, and the second pair of spring arms holds the retaining clip captively in the coupling part in pre-assembly and assembly positions.

Claims

1. A plug-type connector, for hose and/or pipe connections, including a plug part with a plug shaft having a collar, the plug-type connector comprising: a coupling part having a receiving opening defining a central longitudinal axis and into which the plug part is insertable in a plug-in direction along the longitudinal axis, and a radially slotted retaining clip that is resiliently elastic in regions and includes at least two spring arms, the retaining clip having a pre-assembly position on the coupling part that assumes an insertion position for the plug part in which the plug part is insertable through the retaining clip into the receiving opening, and the retaining clip having an assembly position on the coupling part that assumes a retaining position for the inserted plug part in which the plug part with its collar is blocked in the receiving opening in a positive locking manner by the retaining clip against being pulled out of the receiving opening, wherein the basic shape of the retaining clip, when viewed in a direction of the longitudinal axis is a U-shape with legs realized as two pairs of diametrically opposed spring arms arranged one behind the other in the longitudinal direction, the two pairs of spring arms are longitudinally separated from one another by a slot and are resiliently elastic in both a radial direction and the longitudinal direction, wherein a first pair of the spring arms blocks in the plug part in the retaining position in a positive locking manner against being pulled out of the receiving opening and a second pair of the spring arms holds the retaining clip in a captive manner in the coupling part both in the pre-assembly position and in the assembly position; the first pair of the spring arms being located on a side of the retaining clip that faces the plug-in direction of the plug part when the retaining clip is in the insertion position and in the retaining position, each spring arm of the first pair of spring arms including an inclined surface, wherein the inclined surfaces separate in opposition to the plug part being moved in the plug-in direction for interaction with the collar of the plug part, the inclined surfaces in each case being arranged on a side of the spring arms that faces the plug-in direction of the plug part, the inclined surfaces each being formed as at least two part-surfaces each of which defines a divergence angle relative to the longitudinal axis and facing in opposition to the plug-in direction of the plug part, in each case a first part-surface of the inclined surface is situated in the vicinity of a free end of the spring arm and includes a first divergence angle and a second part-surface of the inclined surface is arranged in a central region of the spring arm and includes a second divergence angle, the first divergence angle being smaller than the second divergence angle: wherein differences between the divergence angles is within the range of between 10° and 20°; and wherein guide pins for engagement in complementary guide slots of the coupling part are provided on each of the spring arms that face an end wall of the coupling part, that faces the plug-in direction of the plug part the guide pins each being located in a central region of the spring arms.

2. The plug-type connector as claimed in claim 1, wherein the pre-assembly position and the assembly position of the retaining clip are aligned coaxially with respect to one another and to the longitudinal axis of the coupling part, wherein the retaining clip in the pre-assembly position comprises a clearance for a radial movement.

3. The plug-type connector as claimed in claim 1, wherein the retaining clip is a one piece injection molded part produced from plastics material.

4. The plug-type connector as claimed in claim 1, wherein an actuating surface of the retaining clip is formed as a connecting region between the spring arms on a side of the spring arms located away from the free ends of the spring arms.

5. The plug-type connector as claimed in claim 1, wherein longitudinal guide webs are provided on each of the spring arms that face an end wall of the coupling part that faces the plug-in direction of the plug part, the longitudinal webs being directed in a secant manner to the coupling part and interact with complementary guides provided on the coupling part.

6. The plug-type connector as claimed in claim 5, wherein the longitudinal guide webs are arranged on both sides of a connecting region where the spring arms are connected together.

7. The plug-type connector as claimed in claim 5, wherein the longitudinal guide webs are each arranged on radially inwardly directed projections of the spring arms.

8. The plug-type connector as claimed in claim 1, wherein cams with tips directed inwardly toward one another are provided on each on the spring arms that face away from an end wall of the coupling part that faces the plug-in direction of the plug part.

9. The plug-type connector as claimed in claim 1, wherein the coupling part includes a sleeve part and a receiving body in a ring shape for the retaining clip, the sleeve part and the receiving body being connected together are connected together in an assembled state, wherein one of the sleeve part and the receiving body are realized as an injection molded part formed of a plastic material.

10. The plug-type connector as claimed in claim 9, wherein a sealing package is provided in the sleeve part of the coupling part, the sealing package including two sealing rings and a spacer ring arranged there between.

11. The plug-type connector as claimed in claim 9, wherein the receiving body forms a housing having hollow cylindrical shape closed in each case at respective end walls of the hollow cylindrical shape, an insertion opening and an outlet opening are provided on opposite sides of the housing for the through-passage of the retaining clip.

12. The plug-type connector as claimed in claim 1, wherein the guide slots are situated in a receiving body of the coupling part that is configured to receive the retaining clip.

13. The plug-type connector as claimed in claim 12, wherein each of the guide slots includes a control contour, the control contour and the guide pins cooperating to delimit insertion movement and extension movement of the retaining clip transversely to the plug-in direction of the plug part, and when the retaining clip is moved transversely to the plug-in direction of the plug part the control contour and the guide pins cooperating to cause the spring arms to move radially outward or radially inward.

14. The plug-type connector as claimed in claim 12, wherein a bend point is provided in a portion of the guide slots that leads radially outward and controls an opening movement of the retaining clip, the bend portion configured to cooperate with the guide pins and increase a force acting on an actuating surface that is to be expended for opening of the retaining clip, and the bend portion and guide portions additionally configured to create an acoustic signal.

15. The plug-type connector as claimed in claim 9, wherein on an inside of the end wall of the receiving body there are provided guides that interact with complementary guide webs provided on the spring arms.

16. The plug-type connector as claimed in claim 11, wherein a blocking element, with a counter contour for interaction with cams provided at ends of the spring arms, is provided in a middle region of the outlet opening of the coupling part, wherein the cams and the blocking element define a positive locking and non-positive locking connection between the retaining clip and the coupling part.

17. The plug-type connector as claimed in claim 1, wherein chamfered elevations protrude in the longitudinal direction in opposition to the plug-in direction and are provided on free ends of each of the spring arms that face an end wall of the coupling part that faces the plug-in direction of the plug part, wherein a complementary counter contour to each of the chamfered elevations is defined in the retaining clip as an indentation.

18. The plug-type connector as claimed in claim 1, wherein the legs of the divergence angles are in a common plane and formed on the one hand in each case by the longitudinal axis of the plug-type connector and, on the other hand, in each case by a straight line following the inclination of the inclined surface through respective centers of the part-surfaces.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

(1) The Figures are as Follows:

(2) FIG. 1 shows a three-dimensional exploded representation of an embodiment of a plug-type connector according to the invention,

(3) FIG. 2 shows a three-dimensional representation of the embodiment shown in FIG. 1 of a plug-type connector according to the invention with a plug part to be inserted,

(4) FIG. 3 shows a three-dimensional representation of an embodiment of a retaining clip for the embodiment shown in FIG. 1 of a plug-type connector according to the invention,

(5) FIGS. 4a and 4b show, from various viewing angles, two three-dimensional representations of a receiving body of a coupling part for a retaining clip of the embodiment shown in FIG. 1 of a plug-type connector according to the invention,

(6) FIGS. 5a/5b, 6a/6b, 7a/7b, 8a/8b show in each case a front view and a side view of a sequence of figures of the pre-assembly of an embodiment of a plug-type connector according to the invention,

(7) FIG. 9 shows a front view of a plug-type connector according to the invention in the pre-assembly state, corresponding to the representation in FIG. 8a, but enlarged and rotated by 180°,

(8) FIG. 10a shows a front view of a plug-type connector according to the invention at the start of the assembly,

(9) FIGS. 10b and 10c show two axial sections of the plug-type connector according to the invention shown in FIG. 10a (without a sealing package) at the start of the assembly corresponding to the cutting planes Xb-Xb and Xc-Xc,

(10) FIGS. 11a, 11b, 11c show a radial section (FIG. 11a: plane XIa-XIa in FIG. 11b), an axial section (FIG. 11b) and a view of the end face (FIG. 11c) of representations of the embodiment shown in FIGS. 2, 5a to 8b and 10a to 10c of a plug-type connector according to the invention in the final assembly state with the plug part inserted,

(11) FIG. 12 shows a three-dimensional representation of the embodiment shown in FIGS. 11a to 11c of a plug-type connector according to the invention with a plug part inserted, but not yet in the final assembly state,

(12) FIG. 13 shows a view of the end face of a further embodiment of a plug-type connector according to the invention, in a final assembly state with the plug part inserted,

(13) FIG. 14 shows a representation as in FIG. 3 of an enlarged view of half of a realization of a retaining clip for the embodiment shown in FIG. 1 of a plug-type connector according to the invention,

(14) FIG. 15a shows a top view of the realization of a retaining clip for the embodiment shown in FIG. 1 of a plug-type connector according to the invention,

(15) FIG. 15b shows a section through the embodiment shown in FIG. 15a of a retaining clip according to the invention along the cutting plane XVb-XVb in FIG. 15a,

(16) FIG. 15c shows a section through the embodiment shown in FIG. 15a of a retaining clip according to the invention along the cutting plane XVc-XVc in FIG. 15a.

(17) In the various figures of the drawing, identical parts are always provided with the same reference symbols and are consequently, as a rule, only described once below. In terms of better clarity, however, all parts are not designated with their reference symbols in all the figures of the drawing.

DETAILED DESCRIPTION

(18) It is claimed regarding the following description that the invention is not restricted to the exemplary embodiments and, in this case, not to all or multiple features of described feature combinations, rather each individual part-feature of the/each exemplary embodiment, also detached from all the other part-features described in conjunction therewith, is important to the subject matter of the invention in itself and also in combination with arbitrary features of a different exemplary embodiment.

(19) FIG. 1 shows an exploded representation of an advantageous embodiment of a plug-type connector 1 according to the invention for the connection of a plug part S which is realized as a pipe socket, in particular of an SAE J 2044 male plug. Such a plug S is shown initially—together with the plug-type connector 1 according to the invention—in FIG. 2.

(20) The plug-type connector 1 includes a coupling part 2 and a retaining clip 3 which is resiliently elastic, at least in portions.

(21) The coupling part 2 has a basic body 4, which is realized, in particular, as a sleeve part, and a receiving body 5 for the retaining clip 3 in the basic shape, in particular, of a ring, which basic body and receiving body are connectable together, preferably by means of a substance-to-substance bond, such as by laser welding. A connection shoulder 6 is provided for this purpose on the receiving body 5. The basic body 4 and/or the receiving body 5 can be advantageously realized as injection molded parts consisting of plastics material. The receiving body 5 is shown as an individual part in FIGS. 4a and 4b from various viewing angles each in a three-dimensional representation.

(22) The coupling part 2 can be connected at one end, in particular, to a fluid line (not shown). For this purpose, a connection portion 7 is realized on the basic body 4. A media line to be connected can be realized, in particular, as a hose or pipe.

(23) The basic body 4 of the coupling part 2, in this case, in order to enable heating, is realized as a connector part which comprises the connection portion 7 for the connection of the fluid line and a heating portion 8, in which electric heating media—not shown—can be provided in an arrangement which surrounds the coupling part 2 at least in part. The electric heating media, in particular heating conductors, can be fitted, in this case, on the outside of the coupling part 2, for which reason guide elements 9, in particular helical guide elements 9, are arranged or realized on the shell in the region of the heating portion 8 of the coupling part 2.

(24) On the side located opposite the connection portion 7 for the media line, the coupling part 2 comprises a receiving opening 10 for plugging-in the plug part S.

(25) For sealing the plug-in connection, a sealing package 11 is arranged in the coupling part 2, in the basic body 4 thereof. The sealing package 11 preferably includes two O-rings 12 and a spacer ring 13 located in between.

(26) As FIG. 2 and also FIGS. 10b and 10c and FIGS. 11a to 11c show in particular, the plug part S comprises a plug-in portion S1, on the outer periphery of which a peripheral collar S2 is arranged. The plug part S is realized in a hollow cylindrical manner. The collar S2 divides the plug-in portion S1 into a sealing portion S3 and a locking portion S4, the sealing portion S3 being arranged axially (longitudinal axis X-X) upstream of the locking portion S4 in the plug-in direction SR. Once the plug S has been plugged-in, the sealing package 11 rests on the sealing portion S3, as is shown, for example, in FIG. 3b.

(27) The retaining clip 3 is pre-assemblable on the coupling part 2 as a result of latching and, after insertion in the assembly direction M, assumes the insertion position EP for the plug part S shown in FIGS. 8a, 8b and FIG. 9. It can preferably comprise a clearance for a radial movement in the pre-assembly position. The retaining position HP of the retaining clip 3 for the plug part S is shown in FIGS. 11a to 11c and in FIG. 12 and in FIG. 13 (for a second embodiment of the plug-type connector 1 according to the invention). As can be seen by comparing the figures, the pre-assembly position and the assembly position of the retaining clip 3 in the plug-type connector 1 according to the invention coincide in an advantageous manner, i.e. the retaining clip 3 is aligned coaxially with respect to the axis of the coupling part in both positions—insertion position EP and retaining position HP for the plug parts—and is situated at the identical point in each case in the coupling part 2. In the insertion position EP, the plug part S is insertable into the receiving opening 10 through the retaining clip 3, and in the retaining position HP the plugged-in plug part S with its collar S2 is blockable in a positive locking manner in the receiving opening 10 by means of the retaining clip 3 against being pulled out.

(28) The inner periphery of the receiving opening 10 of the coupling part 2 is advantageously realized in such a manner that, with the plug part S totally and correctly plugged into the receiving opening 10 (FIGS. 11a to 11c, FIG. 12, FIG. 13), the coupling part 2 forms a sealing connection to the plug part S. The sealing package 11 serves, in this case, for total sealing. The receiving opening 10 is delimited at its rear end in the plug-in direction SR in the basic body 4 by a ring wall 14 which forms a through-opening for the fluid.

(29) It is provided according to the invention that the retaining clip 3 is held locked in a captive manner in the coupling part (2) both in the pre-assembly position (insertion position EP) and in the assembly position (retaining position HP), the retaining clip 3 closing off flush in an almost protrusion-free manner with the outer periphery 15 of the coupling part 2. The manner in which the locking is effected in this case in each of the two positions EP, HP is described in more detail below.

(30) First of all, a preferred embodiment of a retaining clip 3 for a plug-type connector 1 according to the invention is described below by way of the three-dimensional representation in FIG. 3.

(31) The retaining clip 3 can be realized preferably—as shown—in one piece, in particular as an injection molded part consisting of plastics material.

(32) The retaining clip 3 is realized, in this case in particular,—when viewed in the direction of the longitudinal axis X-X of the plug-type connector 1—in a U-shaped manner in its basic shape, the legs of the U realizing two pairs 15a/15b, 16a/16b of spring arms 15a, 15b, 16a, 16b which are situated diametrically opposite one another. The spring arms 15a, 15b, 16a, 16b form resiliently elastic regions of the retaining clip 3. The legs of the U, in this case, are separated by a radial slot 17.

(33) The pairs 15a/15b, 16a/16b of spring arms 15a, 15b, 16a, 16b are arranged one behind the other in the axial direction X-X and are also separated from one another by a slot 18, however an axial slot 18. The retaining clip 3, in this case, is realized symmetrically with regard to a longitudinal axis Y-Y which extends through it.

(34) An actuating surface 20 for the retaining clip 3, by means of which the retaining clip 3 can be manually inserted radially (arrow M in FIGS. 5a, 6a, 7a) into the coupling part 2 for pre-assembly (FIGS. 5a/5b to FIGS. 8a/8b), is realized on the side remote from the free ends of the spring arms 15a, 15b, 16a, 16b by means of the connecting region 19 of the legs of the U, which can provide a rigid region of the at least regionally resiliently elastic retaining clip 3.

(35) The front pair 15a/15b, which faces the plug-in direction SR of the plug part 1 in the axial direction X-X, serves predominantly for fulfilling the main function of producing the connection, therefore holds the latching arms 15a, 15b ready for the radial latching of the plug part 1, whilst the rear pair 16a/16b, which faces away from the plug-in direction SR of the plug part S in the axial direction X-X, serves for fulfilling the secondary function according to the invention of locking the retaining clip 3 in its insertion position EP and in its retaining position HP. The locking is illustrated, in particular, by FIG. 11a. As a result, the retaining clip 3 is held in a captive manner in the coupling part 2 both in the pre-assembly position and in the assembly position.

(36) Inclined surfaces 21a, 21b, which diverge in opposition to the plug-in direction SR of the plug part S for interaction with the collar S2 of the plug part S, are situated on each of the spring arms 15a, 15b of the front pair 15a/15b, in particular at least in a central region of the spring arms 15a, 15b. The inclined surfaces 21a, 21b are advantageously each formed in each case by at least two part-surfaces T1, T2 which diverge at various angles μ1, μ2 in opposition to the insertion direction SR of the plug part S. The legs of the angles μ1, μ2 are formed, in this case,—as illustrated in FIG. 3 and also FIG. 14 in an enlarged representation and in FIGS. 15a to 15c, in particular the sectional representations in FIGS. 15b and 15c—on the one hand in each case by the longitudinal axis X-X of the plug-type connector 1 and, on the other hand, by a straight line G1, G2 through the respective center following the inclination of the surface T1, T2. The realization is identical for both inclined surfaces 21a, 21b, therefore also applies to the inclined surface 21b which can only be seen in outline in FIG. 3 and FIG. 14 on account of the perspective representation. FIG. 15b and FIG. 15c also each show the complementary angles 90°−μ1 and 90°-μ2 which enclose the straight lines with the planar clip surface. The angles are specifically at 55° for 90°-μ1 and at 40° for 90°-μ2 or the angle μ1 is equal to 35°, and the angle μ2 is equal to 50°. They differ from one, another therefore by 15°.

(37) The method of operation of the part-surfaces T1, T2 is explained in more detail below with reference to FIGS. 10a to 10c, in which the part-surfaces T1, T2 can also be found.

(38) Furthermore, it is provided that guide pins 23a, 23b for engagement in complementary guide slots 24a, 24b of the coupling part 2 are situated on each of the spring arms 15a, 15b of the front pair 15a/15b of spring arms 15a, 15b, in particular in a central region of the spring arms 15a, 15b.

(39) It can additionally be seen in particular in FIG. 3 as well as in FIGS. 5a, 6a and 7a that longitudinal guide webs 25a, 25b, which are directed in a secant-like manner to the coupling part, for interaction with complementary guides 26a, 26b of the coupling part 2 shown in FIG. 4b, are situated on each of the spring arms 15a, 15b of a front pair 15a/15b of spring arms 15a, 15b, in particular on both sides of the connecting region 19 or also in the connecting region 19 in which the spring arms 15a, 15b, 16a, 16b are connected together.

(40) It is clear, furthermore, from FIGS. 1, 3 and 11a that cams 27a, 27b, with tips which are directed inward toward one another, are realized in each case on the free ends on the spring arms 16a, 16b of the rear pair 16a/16b of spring arms 16a, 16b which faces away from the insertion direction of the plug part S.

(41) As the detailed representations of the receiving body 5 of the coupling part 2 illustrate in FIGS. 4a and 4b as an example, the coupling part 2, in particular by means of its receiving body 5 for the retaining clip 2, forms a housing for the retaining clip 3 which is hollow cylindrical in its basic shape and is closed at each of the respective end walls 29, 30 of the hollow cylinder. In this case, it comprises, on two sides which are situated diametrically opposite one another, peripheral openings 31, 32 for the through-passage of the retaining clip 3, in particular an insertion opening 31 (FIG. 4b) and an outlet opening 32 (FIG. 4a).

(42) The already mentioned guide slots 24a, 24b can also be seen clearly in FIG. 4b. The guide slots 24a, 24b, for the engagement of complementary guide pins 23a, 23b which are located on the front spring arms 15a, 15b of the retaining clip 3, are situated in the coupling part 2, in particular in the receiving body 5 thereof for the retaining clip 3, on the end wall 29 of the coupling part 2 facing the insertion direction of the plug part S. The guide slots 24a, 24b are in each case elongated holes with two bend angles K1, K2. Their form can also be characterized by the form of a stylized lightning flash.

(43) As a result, a control contour is realized in each case in the guide slots 24a, 24b, by means of which control contour, interacting with the complementary guide pins 23a, 23b, on the one hand, an insertion movement and an extension movement of the retaining clip 3 transversely to the plug-in direction SR of the plug part S is delimited, and on the other hand, in the case of a movement of the retaining clip 3 transversely to the plug-in direction SR of the plug part S, the spring arms 15a, 15b, on which the guide pins 23a, 23b are situated, are caused to move radially outward or radially inward.

(44) The already mentioned guides 26a, 26b, which are situated in the coupling part 2, in particular in the receiving body 5 thereof for the retaining clip 3, in particular on the inside of the end wall 29 of the coupling part 2 facing the insertion direction SR of the plug part S, for the complementary guide webs 25a, 25b or guide steps located on the spring arms 15a, 15b of the retaining clip 3, can also be found in FIG. 6b.

(45) Furthermore, the two FIGS. 4a and 4b show that a blocking element 33, with in each case a counter contour 34a, 34b for the abutment of the cams 27a, 27b arranged at the ends of the spring arms 16a, 16b, is situated in the coupling part 2, in particular in the center of the region of the outlet opening 32 of the receiving body 5 of the coupling part 2, the cams 27a, 27b and the counter contours 34a, 34b representing releasable blocking means for the rear spring arms 16a, 16b of the retaining clip 3, insofar as they are able to realize a non-positive and a positive locking connection between the retaining clip 3 and the coupling part 2, as shown in FIG. 11a.

(46) For assembling the plug-type connector 1 according to the invention, first of all according to FIG. 1, the sealing package 11 and then the receiving body 5 is inserted into the basic body 4 of the coupling part 2. Then the basic body 4 and the receiving body 5 are connected together in particular in a substance-to-substance bond—e.g. by means of laser welding.

(47) The retaining clip 3 is then inserted into the coupling part 2 according to the figure sequence 5a/5b to 8a/8b such that the pre-assembly state EP shown in FIGS. 8a/8b and 9 is created. The retaining clip 3 is first of all guided transversely to the plug-in direction SR of the plug part S through the insertion opening 31, which can be facilitated by lead-in chamfers 36 on the coupling part 2 (FIGS. 4b, 5b, 6b). For the insertion of the retaining clip 3, the spring arm pairs 15a/15b, 16a/16b thereof are then pressed axially toward one another, which, in turn, is made possible by the slot 18. This is shown in FIGS. 6a/6b. Jamming or tilting of the retaining clip 3 in the coupling part 2 is advantageously ruled out in this case.

(48) The spring arm pairs 15a/15b, 16a/16b are then relieved of pressure such that guide pins 23a, 23b of the front spring arms 15a, 15b engage in the complementary guide slots 24a, 24b of the coupling part 2 (FIGS. 7a/7b). The guide pins 23a, 23b of the spring arms 15a, 15b, in this case, slot in the ends of the guide slots 24a, 24b such that a return movement of the retaining clip 3 is blocked.

(49) In order to arrive at the final take-up of the pre-assembly position EP, the retaining clip 2 has, however, to be moved further radially in its insertion direction M, the longitudinal guide webs 25a, 25b acting in a stabilizing manner. In the case of the further movement, the cams 27a, 27b of the rear spring arms 16a, 16b are urged apart from one another by means of inclined surfaces 27c, 27d (FIG. 3, FIG. 11a) which are situated thereon and converge inwards in each case as a result of interaction with the counter contours 34a, 34b of the blocking element 33 when they bear against them, pass the counter contours 34a, 34b and finally engage behind them, as shown in FIG. 11a. FIG. 11a does relate to the final assembly position HP, but the fixing is identical in the final assembly position HP and in the pre-assembly position EP of the retaining clip. The retaining clip 3 is consequently situated in the insertion position EP, it being held in a locked manner. As can be seen in particular in FIGS. 8a and 9, the guide pins 23a, 23b of the spring arms 15a, 15b are situated, in this case, in the guide slots 24a, 24b in the region of the second bend angles K2. A plug-type connector 1 according to the invention can be delivered in the state.

(50) FIGS. 10a, 10b and 10c—as already mentioned—show an intermediate state between the pre-assembly state, in particular according to FIG. 9, and the final assembly state, in particular according to FIGS. 11a to 11c and FIG. 12, of a plug-type connector 1 according to the invention. FIGS. 10a, 10b and 10c show, in particular, a state at the start of the plugging-in process, whilst FIGS. 11a, 11b and 11c show the state once the plug-in position of the plug part 1 has been reached.

(51) A comparison of figures between FIG. 10b and FIG. 10c, which show the two different axial sections of the plug-type connector 1 according to the invention according to FIG. 10a corresponding to the cutting planes Xb-Xb and Xc-Xc, illustrates the method of operation of the already mentioned part-inclined surfaces T1, T2. As shown in FIG. 10b, the retaining collar S2 of the plug part S initially contacts the first part-inclined surface T1 when it is inserted into the retaining clip 3, and then when the plug part S is moved further forward in the plug-in direction SR, there is ever increasing contact with the second part-inclined surface T2.

(52) The first part-surface T1, which is arranged operationally upstream of the second part-surface T2 with regard to its interaction with the collar S2 of the plug part S, pulls the retaining clip 3 in radially before it is widened, insofar as the retaining clip 3 is able to comprise more clearance for a radial movement (FIG. 10b). The second part-surface T2, in this case, is still non-functional (FIG. 10c). This is achieved as a result of the first part-surface T1 being at a smaller angle μ1 to the central axis X-X of the plug-type connector 1 than the second part-surface T2. The second part-surface T2 is at a greater angle μ2 to the central axis X-X. The retaining clip being pulled in radially by the first part-surface T1 causes the guide pins 23a, 23b to be moved along on the inner guide surfaces of the guide slots 24a, 24b, and the retaining clip consequently to be already slightly widened. During further insertion following the first part-surface T1, the second part-surface T2 then becomes active and widens the retaining clip 3 radially until in its open position. The retaining clip 3 is widened by the collar S2, the spring arms 15a, 15b moving radially apart from one another such that the collar S2 of the plug part S is able to pass the first latching arm pair 15a/15b in the axial direction. The arms 15a, 15b are then finally able to latch in behind the collar S2. The effect of the further widening of the retaining clip 3 on the guide pins 23a, 23b is such that they are able, in particular, to lift off from the inner guide contour of the guide slots 24a, 24b and move along them until in an end position—this corresponds to the maximum widening of the retaining clip 3 by the collar S2. Once the retaining arms 15a, 15b have latched behind the collar S2, the sliding back of the guide pins 23a, 23b along the inner guide contour of the guide slots 24a, 24b supports the radial return movement of the retaining clip 3 into the insertion position. The guide pins 23a, 23b are then situated once again in the guide slots 24a, 24b in the position of the second bend angle K2.

(53) In the case of a retaining clip 3 without part-surfaces T1, T2 which are configured in this manner, which can be designed, in particular, as chamfers, the guide cams 23a, 23b would only be urged radially outward and a collision could possibly occur with the outer boundaries of the guide contour of the guide slots 24a, 24b in the region of the second bend angle K2. This would result in an unwanted sudden increase in insertion forces and in the case of manual insertion consequently in an irritating jolt in the plug-in feeling for the fitter.

(54) To release the plug-in connection, the retaining clip 3 is displaced further in the actuating direction M as a result of pressing onto its actuating surface 20. As a result, during the actuation the guide pins 23a, 23b are displaced radially outward (arrows Ö in FIGS. 12 and 13) out of the bend region K2 in the guide contour of the guide slots 24a, 24b up to a maximum of the end of the elongated hole. The spring arms 15a, 15b are consequently widened such that the plug part collar S2 is released again as a result of the widening of the spring arms 15a, 15b. The connection can now be released by the plug part S being pulled out of the plug-type connector 1.

(55) Once the retaining clip 3 is then released after disassembly, it slides—on account of the resetting force set by the previously effected widening process—back into a position in which the guide pins 23a, 23b are situated in the region of the second bend angle K2, the retaining clip 3, however, not protruding from the coupling part 2.

(56) As is shown particularly clearly, for example, in FIGS. 9, 12 and 13, the guide slots 24a, 24b of the coupling part 2 initially extend radially outward in a first portion, then radially inward in a second portion and then in a third portion finally radially outward again on account of the two bend points K1, K2.

(57) As the spring arms 15a, 15b are pressed together in the axial direction during pre-assembly (FIG. 6b), the first and the second portions of the guide slots 24a, 24b, however, only play a secondary role during installation according to FIGS. 5a/5b to 8a/8b, it could certainly be possible to dispense with them completely as a breakthrough, they then being closed as an alternative, but in an expedient manner guide grooves could be provided for the guide pins 23a, 23b in the portions on the inside of the wall 29.

(58) The further embodiment of a plug-type connector 1 according to the invention shown in FIG. 13, which shows the final assembly state HP with the plug part S inserted, differs from the first embodiment in that there are three bend points K1, K2, K3 present in the guide slots 24a, 24b of the coupling part 2. The third bend point K3 is situated, in this case, in the respective third portion of the guide slots 24a, 24b which controls the opening movement of the retaining clip 3 and leads radially outward. The third bend point K3, as the guide pins 23a, 23b encounter an additional elevation in their path at this point, provides a resistance against the opening movement and can be localized advantageously in such a manner that precisely when the retaining clip 3 is opened sufficiently for the removal of the plug part S, there is an increase in force, where applicable linked to a click. In particular in the case of small nominal sizes where the actuating surfaces 20 are also small, the state of the release operation is more easily recognizable to the fitter as he obtains a haptic or additionally also an acoustic signal and consequently does not attempt to pull on the plug part S or on a line connected thereto prematurely in order to release the plug-in connection.

(59) Furthermore, the plug-type connector 1 according to the invention can additionally include in an advantageous configuration a pressure locking system which prevents, in particular, the system, that is to say the plug-in connection in the assembled state when the plug part S is plugged-in and is under pressure, from being able to be opened. As a result, it is also possible to rule out the damaging effect of tensile forces acting on the plug part S in the axial direction X-X. In a preferred realization, such a pressure locking system is realized as a result of chamfered elevations 37 (only shown in FIG. 3), which protrude in opposition to the plug-in direction SR in the axial direction X-X, being situated on the front spring arms 15a, 15b, in particular on the free ends thereof, to which in each case a counter contour 38 in the receiving body 5 of the retaining clip 3 corresponds in a complementary manner (only shown in FIG. 4a). The counter contours 38, in this case, are indentations into which the elevations 37 engage in a positive locking manner.

(60) The invention is not restricted to the exemplary embodiments shown and described, but also includes all realizations having the same effect in terms of the invention. Thus, the part-surfaces T1, T2 of the inclined surfaces 21a, 21b are in each case planar surfaces in the exemplary embodiments shown, they could, however, also be designed in each case as truncated cone shell surfaces or as freeform surfaces. In the representation shown in FIG. 15a, they are, in particular, at an angle μ3 with respect to one another, which can preferably be 135°±15°.

(61) The difference μ2-μ1 between the angles μ2, μ1 can preferably be within the range of between 10° and 20° in a general realization. The angles μ2, μ1 themselves can generally preferably assume values within the range of 35°±5° for the angle μ1 and values within the range of 50°±10°, in particular 50°±7°, for the angle μ2.

(62) t is expressly emphasized that the exemplary embodiments are not restricted to all the features in combination, rather each individual part-feature, even separated from all the other part-features, can have inventive significance per se.

(63) In addition, the invention is also hitherto not restricted to the feature combination defined in claim 1 but can also be defined by any arbitrary other combination of certain features of all the individual features disclosed in total. This means that, in principle, practically any individual feature of claim 1 can be omitted or replaced by at least one individual feature that is disclosed at another position in the application.