Coupling part for a hydraulic coupling

Abstract

Coupling part, in particular coupling plug (2), for coupling with a corresponding second coupling part, in particular a coupling sleeve (3), a coupling (1) for pressure medium lines, in particular hydraulic lines, comprising - a housing (21, 31), with a continuous flow channel (23, 33) extending in the axial direction, - a valve body (61, 37, 81) arranged to be axially displaceable back and forth within the flow channel (23, 33) for closing the flow channel (23, 33) in the uncoupled state of the coupling part (2, 3), wherein the valve body (61, 37, 81) has a closed position that closes the flow channel and an open position that does not close the flow channel (23, 33), - a connecting device for mechanically connecting the coupling part to the second coupling part to be coupled, wherein the coupling part (2, 3) comprises a base part (4, 4*) and a connection part (5, 5*) which are connected to each other and form the flow channel (23, 33), wherein the connection part (5, 5*) has a connection section for connecting a pressure medium line, characterized in that the base part (4, 4*) and connection part (5, 5*) each have at least one connection section (43, 56), wherein at least one connection section (43, 56) of the connection part (5, 5*) is radially crimped with a connection section of the base part (4, 4*).

Description

[0001] The invention relates to a coupling part, in particular a coupling plug, for coupling with a corresponding coupling part, in particular a coupling sleeve, for a coupling for pressure medium lines, in particular hydraulic lines, according to the preamble of claim 1.

[0002] Such couplings are designed, for example, as plug-in couplings or screw couplings and ensure the quick connection and disconnection of two pressure medium lines, in particular hydraulic lines. They are used in particular to connect hydraulic devices to a hydraulic source, for example, to connect a tool to an agricultural or construction machine. The couplings have two plug-together coupling parts, namely a coupling plug and a coupling sleeve. Both coupling parts have an axial flow channel for the pressure medium. The coupling plug can be inserted into a receiving opening in the coupling sleeve and releasably locked to it. If the locking is achieved by means of a screw connection, e.g., with a locking sleeve, it is a screw coupling. A plug-in coupling has, for example, a locking ball lock as a locking means.Each coupling part also has a coupling housing within which a spring-loaded valve is located. When uncoupled, the valves are arranged to close the flow channel of the respective coupling part. When the two coupling parts are connected, the valves automatically open, connecting the two flow channels. When disengaged, the valves automatically close the respective flow channel using spring force.

[0003] The coupling parts each have a housing consisting of a base part containing the valve and a connecting part with a connection for a pressure medium line or a machine. The base part and connecting part are usually manufactured as separate components, each provided with a thread, via which they are then screwed together. Couplings with such coupling parts are described, for example, in DE 10 2014 010 570 A1 and EP 4 390 207 A1.

[0004] Couplings of the above type are exposed to mechanical loads and vibrations over the course of their service life. To prevent accidental loosening of the screw connections between the base part and the connecting part, it is common practice to secure the screw connections with adhesives. Although most screw connections today are equipped with such chemical threadlockers, it can still happen that the screw connection loosens over its service life due to aggressive loads and environmental influences. This can lead to damage to the coupling components, which can impair the coupling's function or even render it unusable.

[0005] The invention aims to remedy this situation. The invention is based on the object of providing a coupling part, in particular a coupling plug, for coupling with a corresponding coupling part, in particular a coupling sleeve, a coupling for pressure medium lines, in particular hydraulic lines, as well as such a coupling in which a loosening of the connection between the base part and the connecting part is reliably prevented. According to the invention, this object is achieved by a coupling part having the features of the characterizing part of claim 1.

[0006] The invention provides a coupling part, in particular a coupling plug, for coupling with a corresponding coupling part, in particular a coupling sleeve, a coupling for pressure medium lines, in particular hydraulic lines, in which a loosening of the connection between the base part and the connecting part is reliably prevented. Because the base part and the connecting part each have at least one connecting section, with at least one connecting section of the connecting part being radially pressed against a connecting section of the base part, a reliable connection between the base part and the connecting part is achieved.

[0007] The term "pressing" refers to a joining process in which two parts are joined together using a forming process. "Radial pressing" refers to pressing with exclusively or predominantly radial pressing forces.

[0008] In a further development of the invention, at least one connecting section of the base part is provided, at least in some areas, with a toothing that engages with a toothing present in a connecting section of the connecting part. The toothing of the connecting sections of the base part and the connecting part are radially pressed together. This increases the effective connecting surface, further improving the connection between the base part and the connecting part.

[0009] In one embodiment of the invention, a forming section is arranged adjacent to the toothing of a connecting section, the deformation of which achieves the compression. This results in improved frictional engagement. Advantageously, the toothing has at least one region with a triangular, trapezoidal, and / or rectangular cross-sectional toothing.

[0010] In a further embodiment of the invention, the toothing has teeth of different heights. This further improves the force-to-form fit.

[0011] In a further embodiment of the invention, the gearing comprises teeth whose two flanks are at different angles to the tooth base. This further improves the positive engagement. The respective angle is advantageously between 45° and 60°. In this case, the "tooth base" refers to the plane of the lateral surface on which the tooth is mounted.

[0012] In a further development of the invention, an annular groove for accommodating a sealing ring is located adjacent to the toothing. This provides additional sealing of the connecting part against the base part.

[0013] In an embodiment of the invention, at least one connecting section of the base part is provided, at least in part, with a thread that engages with a thread present in a connecting section of the connecting part. This achieves a defined axial positioning of the base part and connecting part during assembly via a screw-in process. Furthermore, an additional connection is achieved via the thread engagement.

[0014] In a further embodiment of the invention, the base part and the connecting part each have an axial stop surface which abuts one another, wherein an oversize section adjoins the thread of the base part (or alternatively the connecting part) on its side facing the stop surface and a pressing section which narrows in the axial direction adjoins the thread of the connecting part (or alternatively the base part) on its side facing the stop surface, wherein the oversize section is at least partially radially pressed into the pressing section by the screwing-in process. In this way, a pressing between the base part and the connecting part is achieved via the axial screwing-in force. The axial movement of the oversize section arranged on the base part into the narrowing pressing section brings about a pressing between the base part and the connecting part in this area.

[0015] The oversize section has a defined, preferably conical geometry, with the press section forming a counterpart with a reduced diameter. The diameter difference should not exceed 0.1 mm to 0.5 mm, depending on the diameter. The geometry itself preferably consists of a conical surface tapering at an angle of between 5° and 85° to the central axis, which preferably has an angle of between 5° and 45° to the central axis.

[0016] Through this compression, which is achieved by a targeted overlap of the two preferably conical geometries during the screwing-in process, the screw connection, which can also be additionally provided with a chemical locking agent in a known manner, is effectively secured against loosening, thus achieving a reliable connection.

[0017] In a further development of the invention, an annular groove or a shoulder for receiving a sealing ring is arranged in the stop surface of the base part and / or the stop surface of the connecting part. This provides additional sealing of the base part with respect to the connecting part. Alternatively or additionally, an annular groove or a shoulder for receiving a sealing ring can be arranged between the thread and the oversize section in the base part and / or the connecting part.

[0018] Due to the hydraulic pressure that builds up in the coupling during operation, the individual components expand to varying degrees (dilation). The fluid-tight seal between the connecting part and the base body can be achieved directly via appropriately designed conical surfaces or by installing an additional soft seal, such as an elastomer O-ring. The expansion of the components can be influenced by the positioning of the seal between the connecting part and the base body. For this proposed solution, the positioning of a soft seal, preferably axially between the connecting part and the base body, is advantageous.

[0019] This ensures that the base body experiences greater expansion than the connecting part. Under the influence of internal pressure, the surface pressure between the preferably conical contact surfaces of the oversize section and the compression section is further increased due to the expansion differences between the two bodies. External moments that favor the loosening of the connection act primarily during the pressure-loaded phases. However, these phases are also the phases during which the surface pressure between the conical surfaces is greatest. Thus, it is precisely during these phases that maximum security is provided against unintentional loosening of the connection between the base part and the connecting part.

[0020] The present invention further relates to a coupling for a pressure medium line having the features of claim 12. Preferably, the coupling plug and the coupling sleeve each have a valve tappet which, when the coupling plug and coupling sleeve are connected, lie against one another and are each displaced axially into an open valve position against a spring preload, whereby the axial flow channels of the coupling plug and coupling sleeve are opened and connected to one another.

[0021] Further developments and refinements of the invention are specified in the remaining subclaims. Embodiments of the invention are illustrated in the drawings and described in detail below. Identical components are provided with identical reference numerals, while components of differing embodiments are marked with a subscript number indicating the respective modified embodiment. Components of the coupling sleeve that differ from the coupling plug are marked with an asterisk (*). They show: Fig. 1 the schematic representation of a coupling in partial section; Fig. 2 the schematic representation of the coupling plug of the coupling from Fig. 1 in partial section; Fig. 3 the schematic representation of the coupling sleeve of the coupling from Fig. 1 in partial section; Fig. 4 the detailed view of the section “Z” of the coupling plug from Fig. 2; Fig. 5 shows a schematic representation of a coupling plug of a coupling of a second embodiment; Fig. 6 the detailed view of the section “Z” of the coupling plug from Fig. 5; Fig. 7 shows a schematic representation of a coupling of a third embodiment in partial section; Fig. 8 the schematic representation of the coupling plug of the coupling from Fig. 7 in partial section; Fig. 9 the schematic representation of the coupling sleeve of the coupling from Fig. 7 in partial section; Fig. 10 the detailed view of the section “Z” of the coupling plug from Fig. 8; Fig. 11 shows a schematic representation of a coupling of a fourth embodiment in partial section; Fig. 12 the schematic representation of the coupling plug of the coupling from Fig. 11 in partial section a) before pressing the connection between the base part and the connecting part; b) after pressing the connection between the base part and the connecting part; Fig. 13 the schematic representation of the coupling sleeve of the coupling from Fig. 11 in partial section a) before pressing the connection between the base part and the connecting part; b) after pressing the connection between the base part and the connecting part; Fig. 14 the schematic representation of a coupling plug of a coupling of a fifth embodiment in partial section a) before pressing the connection between the base part and the connecting part; b) after pressing the connection between the base part and the connecting part; Fig. 15 the schematic representation of a coupling plug of a coupling of a sixth embodiment in partial section a) before pressing the connection between the base part and the connecting part; b) after pressing the connection between the base part and the connecting part; Fig. 16 the schematic representation of a coupling plug of a coupling of a seventh embodiment in partial section a) before pressing the connection between the base part and the connecting part; b) after pressing the connection between the base part and the connecting part; Fig. 17 the schematic representation of a coupling of an eighth embodiment in partial section a) before pressing the connection between the base part and the connecting part; b) after pressing the connection between the base part and the connecting part; Fig. 18 the schematic representation of the coupling plug of the coupling from Fig. 17 in partial section a) before pressing the connection between the base part and the connecting part; b) after pressing the connection between the base part and the connecting part; Fig. 19 the schematic representation of the coupling sleeve of the coupling from Fig. 17 in partial section a) before pressing the connection between the base part and the connecting part; b) after pressing the connection between the base part and the connecting part; Fig. 20 the detailed view of the section “Z” of the coupling plug from Fig. 18 a) before pressing the connection between the base part and the connecting part; b) after pressing the connection between the base part and the connecting part; Fig. 21 the schematic representation of the coupling plug of a coupling of a ninth embodiment in partial section a) before pressing the connection between the base part and the connecting part; b) after pressing the connection between the base part and the connecting part; Fig. 22 the detailed view of the section “Z” of the coupling plug from Fig. 21 a) before pressing the connection between the base part and the connecting part; b) after pressing the connection between the base part and the connecting part; Fig. 23 shows a schematic representation of a coupling of a tenth embodiment in partial section; Fig. 24 the schematic representation of the coupling plug of the coupling from Fig. 23 in partial section; Fig. 25 the schematic representation of the coupling sleeve of the coupling from Fig. 23 in partial section;

[0022] The example shown in accordance with Fig. 1 selected hydraulic coupling 1 is formed from a coupling plug 2 and a coupling sleeve 3.

[0023] The coupling plug 2 has a housing 21 formed by a base part 4, which is connected to a connecting part 5 and on which a locking sleeve 7 is rotatably arranged. The housing 21 is hollow and has a passage 22 in which a valve arrangement 6 is arranged, which defines a first flow channel 23 extending in the axial direction.

[0024] The valve arrangement 6 comprises a valve tappet 61 acting as a valve body, which has a sealing cone 611 with an enlarged diameter at its end and is stepped at its wider end, forming two axially and radially concentric shoulders 612, 613. A sealing ring 62 is arranged on the outer, first shoulder 612 and projects radially beyond the sealing cone 611. In the axial direction, the sealing ring 62 projects slightly beyond the first shoulder 612. A stop ring 63 is arranged on the inner, second shoulder 613. The stop ring 63 has an annular, circumferential web 631 on the outside, which engages in an annular recess 621 provided for this purpose in the sealing ring 62. A coil spring 64 is arranged on the valve tappet 61, by means of which the valve tappet 61 is preloaded into its sealing position. The stop ring 63 is pressed onto the valve tappet 61.(Alternatively, the stop ring 63 can also be preloaded against the sealing ring 62 via the spiral spring 64.) On its side opposite the stop ring 63, the spiral spring 64 rests against a flow ring 65, which is introduced into the base part 4 of the housing 21 and rests against the connecting part 5, against which it is preloaded via the spiral spring 64. Flow channels 651 are formed circumferentially in the flow ring 65. The inner diameter of the flow ring 65 corresponds approximately to the end outer diameter of the valve tappet 61, which projects into the flow ring 65 and through which it is guided. The outer diameter of the flow ring 65 essentially corresponds to the inner diameter of the base part 4, against which the flow ring 65 rests.

[0025] The base part 4 of the housing 21 is essentially hollow-cylindrical. At its end facing the sealing cone 611 of the valve tappet 61, the base part 4 has an inner cone 41 on the inside, against which the sealing cone 611 of the valve tappet 61 rests, and against which it is preloaded by the spiral spring 64. The sealing cone 611 is sealed against the inner cone 611 by the sealing ring 62. Approximately centrally, a web 42 is provided on the outside of the base part 4. Spaced apart from the web 42, on its side opposite the inner cone 41, is a connecting section 43 into which an external thread 431 is introduced. Spaced apart from the external thread 431, an oversize section 432 is arranged in the connecting section 43 and extends into the end face of the base part 4. In the exemplary embodiment, the oversized portion 432 is conical. A recess 44 is formed in the end face of the base part 4 at a distance from the oversized portion 432.

[0026] The connecting part 5 is designed in the form of a rotationally symmetrical hollow body. It has a first section 51, which is designed in the shape of an external hexagon, followed by a second section 52, which is designed in the form of a line connection. An axial stepped bore 53, which forms a shoulder 54, extends centrally through the connecting part 5.

[0027] A groove 55 is formed on the outside and circumferentially in the first section 51. On the inside, the first section 51 has a connecting section 56 that extends as far as the shoulder 54. An internal thread 561 is arranged in the connecting section 56. Spaced from the internal thread 561 is a pressing section 562 that opens into the shoulder 54. In the exemplary embodiment, the pressing section 562 is designed in the form of an internal cone whose internal diameter is larger than the external diameter of the conical oversized section 432 of the base part 4. The difference between the internal diameter and the external diameter can be between 0.1 mm and 0.5 mm, depending on the size.

[0028] The connecting part 5 is screwed with its internal thread 561 onto the external thread 451 of the base part 4, with the end face of the base part 4 resting against the shoulder 54 of the connecting part 5. During the screwing process, the conical oversize section 432 is forced into the pressing section 562, whereby it is radially pressed with the pressing section 562 (see. Fig. 4). An O-ring is inserted into the recess 44 of the base part 4, sealing the base part 4 from the connecting part 5. The flow ring 65 accommodated by the base part 4 rests against the shoulder 54 of the connecting part 5.

[0029] The locking sleeve 7 is essentially hollow-cylindrical and provided with a cording around its outside. At its end facing the connecting part 5, a flange part 71 with an L-shaped cross-section is arranged, with which the locking sleeve 7 rests on the circumferential web 42 of the base part 4. The locking sleeve 7 is thus rotatably held between the web 42 and the connecting part 5. An annular groove 72 is introduced into the interior of the locking sleeve 7, which extends axially up to the flange part 71 by which it is delimited. At its end opposite the flange part 71, the locking sleeve 7 has a section 73 with an enlarged inner diameter, in which a circumferential groove 74 is introduced on the outside.

[0030] The coupling sleeve 3 is essentially identical to the coupling plug 2. It has a housing 31 formed by a base part 4* that is modified compared to the coupling plug 2 and is connected to a connecting part 5. The housing 31 is hollow and has a passage 32 in which a valve arrangement 6 is arranged, which defines a second flow channel 33 extending in the axial direction.

[0031] In contrast to the base part 4 of the coupling plug 2, the base part 4* of the coupling sleeve 3 has a widened section 421 instead of the web 42, which is provided on the outside with two circumferential grooves 422, 423 arranged axially spaced from one another. At the end of the base part 4, there is an annular piece 45, which is provided with an external thread 451 at a distance from the outer second groove 423. On the side opposite the external thread 451, a groove 452 is formed in the annular piece 45, which accommodates a sealing ring.

[0032] The coupling sleeve 3 is plugged onto the coupling plug 2, with the ring piece 45 of the base part 4* of the coupling sleeve 3 enclosing the base part 4 of the coupling plug 2, and the ring piece 45 resting against the web 42 of the coupling plug 2. The base part 4* is sealed from the base part 4 of the coupling plug 2 by the sealing ring arranged in the groove 452. The locking sleeve 7 is screwed with its internal thread 75 onto the external thread 451 of the ring piece 45 of the base part 4*. The locking sleeve 7 is sealed from the base part 4* of the coupling sleeve 3 by the O-ring arranged in the outer second groove 423.

[0033] When the coupling sleeve 3 is plugged onto the coupling plug 2, the valve tappets 61 of the coupling sleeve 3 and the coupling plug 2 are each moved backwards in the direction of the respective connecting part 5 against the preload force of the respective spiral spring 64, whereby the first flow channel 23 of the coupling plug 2 and the second flow channel 33 of the coupling sleeve 3 are released and complement each other to form one flow channel.

[0034] In the embodiment according to Fig. 5, spaced apart from the web 42 of the base part 41 of the coupling plug 21, on its side opposite the inner cone 41, there is again a connecting section 43 into which an external thread 431 is introduced. Here, however, the external thread 431 extends to the end face of the base part 41. A recess 44 for receiving an O-ring is introduced into the end face, to which an axially extending oversized section 432 adjoins. The oversized section 432 is conical in the exemplary embodiment.

[0035] The connecting part 51 in turn has a first section 51 which is in the form of an external hexagon, to which a second section 52 is connected, which is in the form of a line connection. An axial stepped bore 53, through which a shoulder 54 is formed, is guided centrally through the connecting part 51. Inside the first section 51 there is in turn a connecting section 56 which extends as far as the shoulder 54 and in which an internal thread 561 is arranged which extends as far as the shoulder 54. A press section 562 is introduced into the shoulder 54 and is in the form of an internal cone whose internal diameter is larger than the external diameter of the conical oversize section 432 of the base part 41. The difference between the internal diameter and the external diameter can again be between 0.1 mm and 0.5 mm, depending on the size.

[0036] The connecting part 51 is screwed with its internal thread 561 onto the external thread 431 of the base part 41, with the end face of the base part 41 resting against the shoulder 54 of the connecting part 51. During the screwing process, the conical oversize section 432 extending axially from the end face is forced into the pressing section 562 introduced into the shoulder 54, whereby it is pressed radially flat against the pressing section 562 (see. Fig. 6). An O-ring is inserted into the recess 44 of the base part 41, sealing the base part 41 against the shoulder 54 of the connecting part 51. Of course, the connection between the base part and the connecting part of a coupling sleeve that can be coupled with this coupling plug 21 can be designed in the same way.

[0037] The hydraulic coupling 12 according to Fig. 7 essentially corresponds to the hydraulic coupling 1 according to Fig. 1, wherein the connecting sections 43, 56 of the base part 42 and the connecting part 52 in the coupling plug 22 and the coupling sleeve 32 are modified with regard to the arrangement of the O-ring for sealing the base part 42 relative to the connecting part 52. In this exemplary embodiment, the O-ring is inserted into a groove 57 formed between the internal thread 561 and the shoulder 54 of the first section of the connecting part 52. The external thread 431 of the base part 42 is shortened, whereby a sealing surface 430 is present, against which the O-ring arranged in the groove 57 of the connecting part 52 bears sealingly (cf. Fig. 10).

[0038] The hydraulic coupling 13 according to Fig. 11 essentially corresponds to the hydraulic coupling 1 according to Fig. 1, wherein the connecting sections 43, 56 of the base part 43 and the connecting part 53 are designed differently in the coupling plug 23 and the coupling sleeve 33.

[0039] As in Fig. As shown in Figure 11, an internal toothing 433 is incorporated into the connecting section 43 of the coupling plug 2, which is arranged at a distance from the web 42 of the base part 43. The valleys of the internal toothing 433 are formed with different depths. In the exemplary embodiment, two valleys are present, the depth of which increases in the direction of the web 42. Adjacent to the internal toothing 433 is a press-in recess 434. At a distance from the press-in recess 434, a recess 44 for receiving an O-ring is provided at the end.

[0040] In this embodiment, the first section 51 of the connecting part 53 is designed in the form of a narrow open-end wrench engagement. On the side opposite the second section 52, the first section 51 is adjoined by a conically outwardly extending collar 511. Arranged on the inside of the collar 511 is a connecting section 56, in which an external toothing 563 is incorporated. This corresponds to the internal toothing 433 of the connecting section 43 of the base part 43. The teeth of the connecting section 43 are of different heights, corresponding to the valleys of the internal toothing 433.

[0041] The connecting part 53 is pushed onto the base part 43, with the end face of the base part 43 resting against the shoulder 54 of the connecting part 53. The O-ring arranged in the recess 44 of the base part 43 lies sealingly against the cylindrical inner wall of the first section 51 of the connecting part 53 (see Fig. 12a). The collar 511 is then radially deformed by means of an externally mounted pressing tool (not shown), so that the external toothing 563 of the connecting section 56 engages with the internal toothing 433 of the connecting section 43, wherein a region of the collar 511 adjacent to the external toothing 563 is formed into the press-in recess 434 (cf. Fig. 12b).

[0042] The connecting sections 43, 56 of the base part 43* and the connecting part 53 of the coupling sleeve 33 are as shown in the Fig. 13a and Fig. 13b shown in the same way.

[0043] In the embodiment according to Fig. 14, the coupling plug 24 is essentially the same as the coupling plug 23 of the previous embodiment according to Fig. 11, wherein a locking groove 435 is provided in the connecting section 43 of the base part 44 instead of the internal toothing. A press-in recess 434 is provided at a distance from the locking groove 435. On the front side, in the base part 44 - according to the embodiment according to Fig. 1 - a recess 44 for receiving an O-ring.

[0044] On the connecting section 56 of the connecting part 54 arranged on the inside of the collar 511, a circumferential locking web 564 is arranged at the end instead of external teeth for engagement in the locking groove 435 of the base part 54. Instead of the hexagonal shape of the first section 51 of the base part 53 of the previous embodiment, a largely cylindrical shape is present here.

[0045] The connecting part 54 is pushed onto the base part 44, wherein the end face of the base part 44 lies sealingly against the shoulder 54 of the connecting part 54 via the O-ring arranged in the recess 44 (cf. Fig. 14a). Subsequently, the collar 511 is again radially deformed by an externally attached pressing tool (not shown), so that the locking web 564 of the connecting section 56 engages with the locking groove 435 of the connecting section 43, wherein a region of the collar 511 adjacent to the locking web 564 is formed into the press-in recess 434 (cf. Fig. 14b).

[0046] The coupling plug 25 according to Fig. 15 corresponds largely to the coupling plug 24 of the previous embodiment according to Fig. 14, wherein a second locking groove 435 is introduced into the connecting portion 43 of the base part 45 adjacent to the first locking groove 435.

[0047] On the connecting portion 56 of the connecting part 55 arranged on the inside of the collar 511, adjacent to the circumferential first locking web 564, a second locking web 564 is arranged for engagement in the locking grooves 435 of the base part 55. Instead of the largely cylindrical shape of the first portion 51 of the base part 54 of the previous embodiment, a hexagonal shape is again present here.

[0048] The connecting part 55 is in turn pushed onto the base part 45, with the end face of the base part 45 sealingly abutting the shoulder 54 of the connecting part 55 via the O-ring arranged in the recess 44. (see Fig. 15a). Subsequently, the collar 511 is again radially deformed by an externally attached pressing tool (not shown), so that the locking webs 564 of the connecting section 56 engage with the locking grooves 435 of the connecting section 43, wherein a region of the collar 511 adjacent to the locking webs 564 is formed into the press-in recess 434 (cf. Fig. 15b).

[0049] The coupling plug 26 according to Fig. 16 is largely similar to the coupling plug of the previous embodiment according to Fig. 15, wherein a straight toothing 436 is introduced into the connecting portion 43 arranged at a distance from the web 42 of the base part 46. A recess 44 for receiving an O-ring is again introduced into the front side of the base part 43.

[0050] A cylindrical collar 512 is arranged on the first section 51 of the connecting part 56, on the inside of which a connecting section 56 is arranged. A straight toothing 565 is introduced into the connecting section 56 of the cylindrical collar 512 for engagement with the straight toothing 436 of the base part 46. A pressing recess 566 adjoins the straight toothing 565.

[0051] The connecting part 56 is pushed onto the base part 46, with the end face of the base part 46 in turn sealingly abutting the shoulder 54 of the connecting part 56 via the O-ring arranged in the recess 44. The connecting portion 56 of the cylindrical collar 512 is positioned concentrically at a distance from the connecting portion 43 of the base part 46 (see Fig. 16a).

[0052] Subsequently, the cylindrical collar 512 is radially deformed by means of an externally attached pressing tool (not shown), so that the straight toothing 565 of the connecting section 56 engages with the straight toothing 436 of the connecting section 43, wherein the pressing trough 566 of the connecting section 56 is pressed in, forming an accumulation of material in the transition from the first section 51 to the cylindrical collar 512 (cf. Fig. 16b).

[0053] The hydraulic coupling 17 according to Fig. 17 essentially corresponds to the hydraulic coupling according to Fig. 1, wherein the connecting sections 43, 56 of the base part 47, 47* and the connecting part 57 of the coupling plug 27 and the coupling sleeve 37 are designed differently.

[0054] A straight toothing 436 is provided in the connecting section 43, which is arranged at a distance from the circumferential web 42 of the base part 47 of the coupling plug 27. Furthermore, an external thread 431 is provided in the connecting section 43 at a distance from the straight toothing 436, which extends to the end face of the base part. A recess 44 for receiving an O-ring is provided in the end face of the base part 48.

[0055] In the first section 51 of the connecting part 58, there is a connecting section 56 on the inside, which extends up to the shoulder 54. An internal thread 561 is arranged in the connecting section 56, which extends up to the shoulder 54. On the side opposite the second section 52, a cylindrical collar 512 is arranged on the first section 51, into which a straight toothing 565 is introduced at its free end, spaced from the internal thread 561, for engagement with the straight toothing 436 of the base part 47.

[0056] The connecting part 57 is screwed with its internal thread 561 onto the external thread 431 of the base part 47, with the end face of the base part 47 resting against the shoulder 54 of the connecting part 57. The connecting portion 56 of the cylindrical collar 512 is positioned concentrically to the connecting portion 43 of the base part 47 at a distance (see Fig. 18a, Fig. 20a).

[0057] Subsequently, the cylindrical collar 512 is radially deformed by means of an externally attached pressing tool (not shown) so that the straight toothing 565 of the connecting section 56 engages with the straight toothing 436 of the connecting section 43 (cf. Fig. 18b, Fig. 20b).

[0058] The connecting sections 43, 56 of the coupling sleeve 37, via which the base part 47* and the connecting part 57 are connected, correspond to the connecting sections 43, 56 of the coupling plug 26 described above (cf. Fig. 19).

[0059] The coupling plug 28 according to Fig. 21 essentially corresponds to the previously described coupling plug 27 of the hydraulic coupling according to Fig. 18, wherein the connecting sections 43, 56 of the base part 48 and the connecting part 58 are designed differently. Here, a locking web 437 is arranged on the base part 48 instead of the straight toothing, spaced from the internal thread 431, and a locking web 564 is provided on the inside of the cylindrical collar 512 of the connecting part 58 instead of the straight toothing.

[0060] The connecting part 58 is in turn screwed with its internal thread 561 onto the external thread 431 of the base part 48, with the end face of the base part 48 resting against the shoulder 54 of the connecting part 58. The connecting portion 56 of the cylindrical collar 512 is in turn positioned concentrically at a distance from the connecting portion 43 of the base part 48 (see Fig. 21a, Fig. 22a).

[0061] Subsequently, the cylindrical collar 512 is radially deformed by means of an externally mounted pressing tool (not shown) so that the locking web 512 of the connecting part 58 engages behind the locking web 437 of the base part 48 (cf. Fig. 21b, Fig. 22b).

[0062] Of course, the connection of the base part and the connecting part of a coupling sleeve that can be coupled with this coupling plug 28 can be designed in the same way.

[0063] The hydraulic coupling 1 10 according to the embodiment according to Fig. 23 is made of a coupling plug 2 10 and a coupling sleeve 3 10 formed, which have a different construction with a different valve arrangement compared to the previously described embodiments.

[0064] The coupling plug 2 10has a housing 21 formed by a base part 4, which is connected to a connecting part 5. The housing 21 is hollow and has a passage 22 in which a valve arrangement 8 is arranged, through which a first flow channel 23 extending in the axial direction is delimited.

[0065] The valve assembly 8 comprises a hollow valve tappet 81, which functions as a valve body and is formed from a tappet sleeve 811 provided with a tappet cap 812. A shoulder 813 is arranged in the tappet sleeve 811, against which a coil spring 84 rests, preloading the valve tappet 81 into its sealing position. With its end opposite the valve tappet 81, the coil spring 84 rests against a shoulder 54 provided in the connecting part 5.

[0066] The base part 4 of the housing 21 is essentially designed as a stepped hollow cylindrical component. At its end facing the tappet cap 812 of the valve tappet 81, the base part 4 has an inner cone 41, to which a reduced-diameter cylindrical guide section 46 adjoins, forming a shoulder 47. An annular groove 461 is formed inside the guide section 46 for receiving a sealing ring for sealing against the tappet cap 812. The tappet cap 812 is preloaded against the shoulder 47 by the spiral spring 84 with a collar 813 arranged thereon for this purpose. In this position, the tappet cap 812 is aligned with the end face of the guide section 46. A connecting section 48 adjoins the inner cone 41 on its side opposite the guide section 46. An internal thread 481 is arranged in the connecting section 48 and extends to its free end.Spaced apart from the internal thread 481 is a pressing section 482, which in the exemplary embodiment is designed as an internal cone and which opens into a shoulder 483. An annular groove 484 for receiving a sealing ring is provided between the internal thread 481 and the pressing section 481.

[0067] The connecting part 5 is designed in the form of a rotationally symmetrical hollow body. It has a first section 51 in the shape of an external hexagon, followed by a second section 52 in the form of a line connection. Opposite the second section 52, the first section 51 is adjoined by a connecting section 58 into which an external thread 581 is introduced. At a distance from the external thread 581, an oversized section 582 is arranged in the connecting section 58 and extends into the end face of the connecting part 5. In the exemplary embodiment, the oversized section 582 is conical. Between the oversized section 582 and the external thread 581, an undercut forming a sealing surface is introduced into the connecting section. An axial stepped bore 53 is guided centrally through the connecting part 5, through which a shoulder 54 is formed, against which the spiral spring 84 rests.

[0068] The base part 4 is screwed with its internal thread 481 onto the external thread 581 of the connecting part 5, with the end face of the connecting part 5 resting against the shoulder 483 of the base part 4. During the screwing process, the conical oversize section 582 is forced into the pressing section 482, whereby it is radially pressed with the pressing section 482. The base part 4 is sealed against the connecting part 5 by the sealing ring inserted into the annular groove 484.

[0069] The coupling sleeve 3 10 has a housing 31 which is connected by a coupling plug 2 10A different connecting part 5* is formed, which is connected to a base part 4* that is also designed differently. The housing 31 is hollow and has a passage 32 in which a valve arrangement 8* is arranged, through which a second flow channel 33 running in the axial direction is delimited. A piston 34 is arranged centrally in the passage 32 in a stationary manner via an annular piece 35 provided with axial passages, which piston has a sealing cone 341 with an enlarged diameter at its end, which is provided all around with a sealing ring 342. Opposite the annular piece 35, the connecting part 5* has a connecting section 56 that extends up to a shoulder 54 against which the annular piece 35 rests. An internal thread 561 is arranged in the connecting section 56. A press section 562, which opens into the shoulder 54, is located at a distance from the internal thread 561.In the exemplary embodiment, the pressing section 562 is designed in the form of an inner cone whose inner diameter is larger than the outer diameter of the conical oversize section 432 of the base part 4*.

[0070] A first inner sleeve 36 is applied to the ring piece 35. The first inner sleeve 36 is essentially hollow-cylindrical and, at its end facing away from the ring piece 35, has two spaced-apart webs 361 on the inside, between which sealing rings are arranged. At its end opposite the webs 361, the first inner sleeve 36 has a section 362 with an enlarged inner diameter, against which the ring piece 35 rests. On the outside, the section 362 with an enlarged inner diameter is adjoined by a two-stage outer diameter reduction, formed by a first shoulder 363 and an adjoining second shoulder 364.

[0071] A substantially hollow-cylindrical second inner sleeve 37 is arranged in the first inner sleeve 36, which at one end bears with its outer surface against the webs 361 and with its opposite end with its end face against the sealing cone 341 of the piston 34, as well as with its inner surface against the sealing ring 342. The second inner sleeve 37 is the central component of the valve arrangement 8*. At its end opposite the sealing cone 341, the second inner sleeve 37 has an outer circumferential collar 371 with which it engages behind the inner web 361 of the first inner sleeve, against which it is prestressed by a spiral spring 343 surrounding the piston 34. As Fig. 25, the flow channel 33 is limited by the piston 34 and the first and second inner sleeves 36, 37.

[0072] The base part 4* of the housing 31 is essentially hollow-cylindrical. At its end facing the sealing cone 341 of the piston 34, the base part 4* has a section 49 with a reduced inner diameter, through which a shoulder 491 is formed. In the section 49 with a reduced inner diameter, bores 492 are provided in a ring-shaped circumferential direction, tapering inwardly and receiving balls 76. At the end opposite the section 49 with a reduced inner diameter, a connecting section 43 is arranged on the base part 4*, into which an external thread 431 is formed. Spaced apart from the external thread 431, an oversize section 432 is arranged in the connecting section 43 and extends into the end face of the base part 4. In the exemplary embodiment, the oversize section 432 is conical.

[0073] The base part 4* is screwed with its external thread 431 into the internal thread 561 of the connecting part 5*, with the end face of the base part 4* abutting the shoulder 54 of the connecting part 5*. During the screwing process, the conical oversize section 432 is forced into the pressing section 562, whereby it is radially pressed with the pressing section 562. The connecting section 43 of the base part 4* abuts the first inner sleeve 36, with a shoulder 485 arranged on its inner side abutting the first shoulder 363 of the first inner sleeve 36. The first inner sleeve 36 is thus firmly held between the annular piece 35 and the connecting section 43 of the base part 4*.

[0074] A locking sleeve 7 is pushed onto the base part 4*, which is provided with an annular groove 77 on its end facing the sealing cone 341 of the piston 4, into which balls 76 inserted into the bores 492 of the base part 4* engage. The locking sleeve 7 is preloaded in the direction opposite to the connecting part 5* by a spiral spring 78 arranged between it and the base part 4*.

[0075] The valve tappet 82 of the coupling sleeve 3 10is designed in the form of a cylindrical sleeve which, at its end facing the sealing cone 341 of the piston 4, has an inwardly projecting collar 821 whose inner diameter essentially corresponds to the maximum outer diameter of the sealing cone 341. At its end opposite the collar 821, the valve tappet 82 has an externally circumferential web 822 with which it bears against the shoulder 491 of the base part 4*, against which it is prestressed by a spiral spring 83 arranged between the first inner sleeve 36 and the base part 4*. By moving the valve tappet 82 against the preload of the spiral spring 83, the bores 492 of the base part 4* are first released, whereby the balls 76 previously resting on the valve tappet 82 move inwards out of the annular groove 77 of the locking sleeve 7, whereby the locking sleeve 7, which was previously held in position by the balls 77, is moved in the direction of the coupling plug 2 by the preload of the spiral spring 78.10 is pushed.

[0076] Upon further movement of the valve tappet 82, its collar 821 strikes a shoulder 372 located on the outside of the second inner sleeve 37, whereby the second inner sleeve 37 is moved away from the sealing cone 341 of the piston 34 against the preload of the spiral spring 343. As a result, the second flow channel 33 of the coupling sleeve 3 10 released. The valve tappet 82 is therefore part of the valve assembly 8* and interacts with the second inner sleeve 37, which here functions as the valve body. QUOTES CONTAINED IN THE DESCRIPTION

[0000] This list of documents submitted by the applicant was generated automatically and is included solely for the convenience of the reader. This list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions. Cited patent literature

[0000] DE 10 2014 010 570 A1

[0003] EP 4 390 207 A1

[0003]

Claims

[1] Coupling part, in particular a coupling plug (2), for coupling with a corresponding second coupling part, in particular a coupling sleeve (3), a coupling (1) for pressure medium lines, in particular hydraulic lines, comprising - a housing (21, 31) with a continuous flow channel (23, 33) running in the axial direction, - a valve body (61, 37, 81) arranged within the flow channel (23, 33) so as to be displaceable back and forth in the axial direction for closing the flow channel (23, 33) in the uncoupled state of the coupling part (2, 3), wherein the valve body (61, 37, 81) has a closed valve position closing the flow channel and an open valve position not closing the flow channel (23, 33), - a connecting device for mechanically connecting the coupling part to the second coupling part to be coupled, wherein the coupling part (2, 3) comprises a base part (4, 4*) and a connecting part (5, 5*) which are connected to one another and form the flow channel (23, 33), wherein the connecting part (5, 5*) has a connecting section for connecting a pressure medium line, characterized by that the base part (4, 4*) and connecting part (5, 5*) each have at least one connecting section (43, 56), wherein at least one connecting section (43, 56) of the connecting part (5, 5*) is pressed radially with a connecting section of the base part (4, 4*). [2] Coupling part according to claim 1, characterized bythat at least one connecting section (43) of the base part (4, 4*) is provided at least in some regions with a toothing (433, 436) which engages in a toothing (563, 565) present in a connecting section (56) of the connecting part (5, 5*), wherein the toothings (433, 436, 563, 565) of the connecting sections (43, 56) of the base part (4, 4*) and of the connecting part (5, 5*) are radially pressed together. [3] Coupling part according to claim 2, characterized by that adjacent to the toothing (433, 436, 563, 565) of a connecting section (43, 56) there is arranged a forming section, by the deformation of which the pressing is achieved. [4] Coupling part according to claim 2 or 3, characterized by that the toothing (433, 436, 563, 565) has at least one region with a toothing that is triangular in cross section and / or trapezoidal in cross section and / or rectangular in cross section. [5] Coupling part according to one of claims 2 to 4, characterized by that the toothing (433, 563) has teeth of different heights. [6] Coupling part according to one of claims 1 to 5, characterized by that the toothing (433, 563) has teeth whose two flanks have a different angle to the tooth base, wherein the respective angle is preferably between 45° and 60°. [7] Coupling part according to one of claims 2 to 6, characterized by that an annular groove (44, 57) for receiving a sealing ring is connected to the toothing (433, 436, 563, 565). [8] Coupling part according to one of the preceding claims, characterized by that at least one connecting section (43) of the base part (4, 4*) is provided at least in some areas with a thread (431) which is in threaded engagement with a thread (561) present in a connecting section (56) of the connecting part (5, 5*). [9] Coupling part according to claim 8, characterized byin that the base part (4, 4*) and the connecting part (5, 5*) each have an axial stop surface which abuts one another, wherein an oversize section (432) adjoins the thread (431, 561) of the base part (4, 4*) or of the connecting part (5, 5*) on its side facing the stop surface, and a pressing section (562) narrowing in the axial direction adjoins the thread of the connecting part (5, 5*) or of the base part (4, 4*) on its side facing the stop surface, wherein the oversize section (432) is at least partially radially pressed with the pressing section (562) by the screwing-in process. [10] Coupling part according to claim 9, characterized by that the oversize section (432) is conical at least in some areas. [11] Coupling part according to claim 9 or 10, characterized bythat an annular groove (55) or a recess (44) for receiving a sealing ring is arranged in the stop surface of the base part and / or the stop surface of the connecting part. [12] Coupling part according to claim 9 or 10, characterized by that an annular groove (55) or a shoulder (44) for receiving a sealing ring is arranged between the thread (431, 561) and the oversize section (432) in the base part (4, 4*) and / or the connecting part (5, 5*). [13] Coupling (1) for a pressure medium line, in particular a hydraulic line, with a coupling plug (2) which is detachably connected to a coupling sleeve (3), characterized by that the coupling plug (2) and / or the coupling sleeve (3) is designed according to one of the preceding claims. [14] Coupling according to claim 13, characterized byin that the coupling plug (2) and the coupling sleeve (3) each have a valve tappet (61), which valve tappets (61) lie against one another during the connection of the coupling plug (2) and the coupling sleeve (3) and are each displaced axially into an open valve position against a spring preload, whereby the axial flow channels (23, 33) of the coupling plug (2) and the coupling sleeve (3) are opened and connected to one another.

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