Convex hydraulic coupler element and hydraulic coupler

Abstract

The utility model discloses a convex hydraulic coupler element and a hydraulic coupler. The convex hydraulic coupler element comprises a convex body, a supporting ring and a nozzle. The support ring is fastened longitudinally and radially to the convex body which is in contact with the support ring in a front longitudinal direction. The support ring and the convex body together define an inner housing. The nozzle includes a collar and a nose. A collar is mounted in the inner housing, movable in a direction radial to the longitudinal central axis. The nose extends from the support ring in a front longitudinal direction. The support ring is fixed to the convex body longitudinally and radially by welding. Therefore, the utility model provides a fixing structure which is fixed between the convex body and the support ring by welding, and can well adapt to some radial sizes and / or some materials of the convex body.

Description

Technical Field

[0001] The utility model relates to a convex hydraulic coupler element and a hydraulic coupler comprising the convex hydraulic coupler element. The convex hydraulic coupler element and the hydraulic coupler are well suitable for cooling applications. Background Art

[0002] It is known from CN-U-214305779 that a male fluid coupling with an inner housing is proposed for radial displacement of a collar formed in a nozzle. The inner housing is defined between a male body and a support ring. The support ring is fixed to the front of the skirt of the male body, in particular by crimping the skirt onto the support ring. For some radial dimensions of the male body and some materials of the male body and the support ring, the crimping is not suitable.

[0003] The utility model aims to provide a convex fluid coupling element, in which the fixation between the convex body and the supporting ring by welding is well adapted to some radial dimensions and / or some materials of the convex body. Utility Model Content

[0004] According to one aspect of the utility model, a convex fluid coupling element includes a convex body centered on a longitudinal central axis. The convex fluid coupling element also includes a support ring, which is longitudinally and radially fastened to the convex body, and the first front axial annular surface of the convex body contacts the first rear axial surface of the support ring in the front longitudinal direction of the convex fluid coupling element. The support ring and the convex body together define an internal shell. The convex fluid coupling element also includes a nozzle centered on the longitudinal central axis. The nozzle includes a shaft ring and a nose. The shaft ring is installed in the internal shell and can move relative to the convex body and the support ring in a direction radial to the longitudinal central axis. The nose extends from the support ring in the front longitudinal direction. The nozzle and the convex body define the internal pipeline of the convex fluid coupling element. The support ring is longitudinally and radially fixed to the convex body by welding.

[0005] According to another aspect of the present invention, the support ring is centered on the longitudinal central axis through radial cooperation between the cylindrical surface of the support ring and the cylindrical surface of the convex body.

[0006] According to another aspect of the present invention, the support ring is longitudinally and radially fixed to the protrusion by a weld, which is located at the junction of the first front axial annular surface of the protrusion and the outer radial surface of the protrusion, and at the junction of the first rear axial surface of the support ring and the outer radial surface of the support ring.

[0007] According to another aspect of the utility model, the convex body comprises a base and a skirt. The skirt extends from the base in the front longitudinal direction and radially defines the inner shell. The first front axial annular surface of the convex body is formed at the front end of the skirt.

[0008] According to another aspect of the utility model, the support ring includes a skirt. The skirt extends from the base of the support ring in a rear longitudinal direction of the male fluid coupling element opposite to the front longitudinal direction, and the skirt radially defines the inner housing. The first rear axial surface of the support ring is formed at the rear end of the skirt.

[0009] According to another aspect of the invention, the male fluid coupling element comprises a slip ring made of a polymer, which is longitudinally sandwiched between a collar and a support ring and is radially fixed to the nozzle.

[0010] According to another aspect of the present invention, the support ring forms a second rear axial surface which is in direct contact with the annular front axial surface of the collar, and the second rear axial surface is coated with a coating based on physical vapor deposition.

[0011] According to another aspect of the present invention, the male fluid coupling element includes a male valve that is longitudinally movable within the nozzle between a closed position within the internal conduit, wherein the male valve fits tightly with the nozzle and closes the internal conduit, and an open position wherein the male valve does not fit tightly with the nozzle. In the closed position of the male valve, a front end surface of the male valve is at the same longitudinal level as a front end surface of the nozzle.

[0012] According to another aspect of the invention, the male fluid coupling element comprises a sealing gasket housed in the annular rear axial surface of the collar and in close contact with a second front axial annular surface of the male body, which longitudinally delimits the inner housing.

[0013] According to another aspect of the present invention, a fluid coupling comprises a male fluid coupling element according to the present invention and a complementary female fluid coupling element. The complementary female fluid coupling element has a female body defining an internal conduit of the complementary female fluid coupling element. The female body also forms a front conical surface for contacting the nose of the nozzle when the longitudinal center axis of the nozzle and the longitudinal center axis of the female body are misaligned during coupling of the male fluid coupling element with the complementary female fluid coupling element. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] The utility model will be combined with the attached Figure 1-5 However, this embodiment is not intended to limit the scope of the present invention in any way. In the accompanying drawings:

[0015] Figure 1 A male fluid coupling element and a female fluid coupling element in a disconnected state according to a first embodiment of the present invention are shown.

[0016] Figure 2 yes Figure 1Detailed view of detail II.

[0017] Figure 3 The male fluid coupling element and the female fluid coupling element are shown in the coupling (connection) process according to the first embodiment of the present invention.

[0018] Figure 4 A male fluid coupling element and a female fluid coupling element in a connected state according to a first embodiment of the utility model are shown.

[0019] Figure 5 An isometric view of a male fluid coupling element according to a first embodiment of the invention is shown.

[0020] Figure 6 A male fluid coupling element in a disconnected state according to a second embodiment of the present invention is shown.

[0021] Figure 7 yes Figure 6 Detailed view of detail VII.

[0022] Figure 8 An isometric view of a male fluid coupling element according to a second embodiment of the invention is shown. DETAILED DESCRIPTION

[0023] The utility model relates to a hydraulic coupler 1, which is formed by a male coupling element and a complementary female coupling element that can be fluidically connected to each other. For example, the coupler 1 is suitable for conveying refrigerant fluid for cooling applications. The male coupling element and the female coupling element include a rotating part.

[0024] For each coupling element, the "front longitudinal direction" or the adjective "front" means that it rotates in the direction of the other coupling element, while the "rear longitudinal direction" or the adjective "rear" means that it rotates in the opposite direction. Figure 1 shows the front longitudinal direction F and the rear longitudinal direction R of the male fluid coupling element 2 according to the first embodiment, Figure 6 The front longitudinal direction F and the rear longitudinal direction R of the male fluid coupling element 2 ′ according to the second embodiment are shown.

[0025] refer to Figures 1 to 5 A first embodiment is described. The male coupling element 2 comprises a male body 21. The male body 21 is metal, for example stainless steel with good weldability. The male body 21 has a rear portion 216 which partially defines the rear of the internal conduit 20 of the male coupling element 2 and which is connected to the conduit of the first support (not shown) by screws. The male body 21 is centered on a longitudinal central axis X21.

[0026] With respect to the male coupling element 2, the words "radial", "longitudinal", "axial" relate to the longitudinal center axis X21. The radial direction is perpendicular to the longitudinal center axis X21. The longitudinal direction is parallel to the longitudinal center axis X21. The axial surface is perpendicular to the longitudinal center axis X21. The radial surface extends around the longitudinal center axis X21. The outer surface is turned opposite to the longitudinal center axis X21. The inner surface or internal surface is turned towards the longitudinal center axis X21.

[0027] The convex body 21 further includes a base 217 adjacent to the rear portion 216 in the front longitudinal direction F and a skirt 212 extending from the base 217 in the front longitudinal direction F. The outer diameter of the base 217 is larger than the outer diameter of the rear portion 216. The convex body 21 is designed in a single piece, so the rear portion 216, the base 217 and the skirt 212 are integral. The outer diameter of the rear portion 216 is smaller than the outer diameter of the skirt 212. The skirt 212 forms a rear cylindrical inner surface 2121, an intermediate cylindrical inner surface 2122, a cylindrical surface 2123, and a first front axial annular surface 214 formed at the front end of the skirt 212, wherein the cylindrical surface 2123 is located inside and in front of the intermediate cylindrical inner surface 2122. The skirt 212 also forms an outer radial surface 218 that engages with the first front axial annular surface 214. The base 217 forms a second front axial annular surface 215 of the convex body 21. The diameter of these cylindrical inner surfaces decreases in the front longitudinal direction F. The sealing gasket 219 is housed in a circumferential groove in the rear axial surface of the base 217. The sealing gasket 219 ensures tightness with the first support (not shown in the drawings) when the projection 21 is screwed to the first support.

[0028] The nozzle 24 is partially housed in the convex body 21. The nozzle 24 partially defines the front part of the internal duct 20, which is in fluid communication with the rear part of the internal duct 20 defined by the convex body 21. The nozzle 24, in particular the front part of the internal duct 20, is centered on the axis X24. The nozzle 24 includes a collar 241 having an annular rear axial surface 246 provided with a circumferential groove for accommodating a sealing gasket 245, such as a polymer O-ring. The collar 241 also forms an annular front axial surface 247. The collar 241 has a first radially outer surface 243, which opens to the annular rear axial surface 246 of the collar 241, and a second radially outer surface 244, which opens to the annular front axial surface 247 of the collar 241. The diameter D243 of the first radially outer surface 243 is greater than the diameter D244 of the second radially outer surface 244.

[0029] The nozzle 24 further comprises a nose 242 extending from the collar 241 and protruding forwardly relative to the frontmost surface 2121 of the skirt 212. Compared to the collar 241, the nose 242 has a smaller outer diameter.

[0030] The male valve 26 is mounted in the internal conduit 20 in the nozzle 24 and can be moved longitudinally between a closed position and a rear open position, in which the male valve 26 is tightly fitted with the nozzle 24 with a sealing gasket 261 therebetween and closes the internal conduit 20, and in the rear open position, the male valve 26 is not tightly fitted with the nozzle 24 and the internal conduit 20 is open in the front longitudinal direction F. The spring 27 pushes the male valve 26 towards its closed position. The spring 27 is mounted on an abutment ring 28, which is stopped in the rear longitudinal direction R by a retaining ring 29 housed in the nozzle 24.

[0031] In the closed position of the male valve 26 , the front end surface 262 of the male valve 26 and the front end surface 248 of the nose 242 are at the same longitudinal level.

[0032] The support ring 22 is placed at the front end of the skirt 212. The support ring 22 is metal, such as stainless steel with good weldability, and is annular. The support ring 22 forms an outer groove 221 longitudinally defined by a first rear axial surface 224 and a second rear axial surface 223 of the support ring 22. The second rear axial surface 223 defines the outer groove 221 in the rear longitudinal direction R. The first rear axial surface 224 defines the outer groove 221 in the front longitudinal direction F. The first rear axial surface 224 engages with an outer radial surface 226 of the support ring 22. The second rear axial surface forms the rear end of the support ring 22. The cylindrical surface 225 as the outer surface radially defines the outer groove 221. The outer groove 221 accommodates a portion of the skirt 212 in a configuration in which the skirt 212 and the support ring 22 are fixed together. In particular, the first front axial annular surface 214 of the skirt 212 abuts against the first rear axial surface 224 in the front. The cylindrical surface 225 radially faces the cylindrical surface 2123 with a reduced radial gap therebetween, for example 0.05 mm. In other words, by the radial cooperation of the cylindrical surface 225 with the cylindrical surface 2123, the support ring 22 is centered on the longitudinal central axis X21.

[0033] The support ring 22 is longitudinally and radially fixed to the protrusion 21 by welding. A weld bead 25 is formed from the outside at the contact between the first rear axial surface 224 and the first front axial annular surface 214 of the skirt 212. The weld bead 25 is located at the junction of the first front axial annular surface 214 of the protrusion 21 and the outer radial surface 218 of the protrusion 21, and at the junction of the first rear axial surface 224 of the support ring 22 and the outer radial surface 226 of the support ring 22. Preferably, the weld bead 25 extends continuously around the longitudinal center axis X21 over the entire circumference.

[0034] When the support ring 22 is welded to the convex body 21, the inner housing 23 is radially defined by the skirt 212, in particular, by the rear cylindrical inner surface 2121, the intermediate cylindrical inner surface 2120, and the cylindrical surface 2123, and is longitudinally defined by the second front axial annular surface 215 of the base 217 and the second rear axial surface 223 of the support ring 22. In other words, the support ring 22 and the convex body 21 together define the inner housing 23.

[0035] The diameters D243 and D244 are smaller than the inner diameter of the skirt 212 , so that the collar 241 is received in the inner housing 23 with a radial gap between the skirt 212 and the collar 241 .

[0036] The outer diameter of the nose 242 at the longitudinal level of the support ring 22 is smaller than the inner diameter D22 of the hole through the support ring 22, so that there is a radial gap between the nose 242 and the support ring 22. This gap is almost equal to the radial gap between the collar 241 and the skirt 212.

[0037] In the mounting configuration of the nozzle 24 in the convex body 21, the collar 241 is placed longitudinally between the support ring 22 and the convex body 21. The annular front axial surface 247 of the collar 241 is in direct contact with the second rear axial surface 223 of the support ring 22. In order to reduce friction, this second rear axial surface 223 of the support ring 22 is preferably coated with a PVD (based on physical vapor deposition) coating.

[0038] The collar 241 is mounted in the inner housing 23 and is displaceable in a direction radial to the longitudinal centre axis X21 relative to the projection 21 and the support ring 22. The nose 242 projects from the support ring 22 in the front longitudinal direction.

[0039] When the first rear axial surface 224 of the support ring 22 is positioned by the axial abutment surface 213 of the skirt 212, the longitudinal dimension of the inner housing 23 is defined and precisely controlled between the second front axial annular surface 215 and the first rear axial surface 224. Therefore, the axial compression of the sealing gasket 245 between the second front axial annular surface 215 of the protrusion 21 and the collar 241 is precisely controlled. The sealing gasket 245 is in close contact with the second front axial annular surface 215.

[0040] The complementary female fluid coupling element 4 comprises a female body 41 through which passes an internal duct 412. The internal duct 412 and the female body 41 are centred on a central longitudinal axis X41.

[0041] With regard to the complementary female coupling element 4, the words "radial", "longitudinal", "axial" relate to the longitudinal centre axis X41. The radial direction is perpendicular to the longitudinal centre axis X41. The axial surface is perpendicular to the longitudinal centre axis X41. The longitudinal direction is parallel to the longitudinal centre axis X11.

[0042] The female body 41 has a rear portion 413 of reduced diameter which is screwed onto the pipe of the second support (not shown). A sealing gasket 414 is housed in a circumferential groove in the rear axial surface of the female body 41. This sealing gasket 414 ensures tightness with the second support (not shown in the drawings) when the female body 41 is screwed to the second support.

[0043] The central rod 42 is longitudinally fixed in the internal conduit 412, with its base 421 placed between the rear axial abutment surface of the female body 41 and the snap ring 422. The front part of the central rod 42 accommodates a sealing gasket 424, which is tightly radially cooperating with the female valve 43 in the closed position of the female valve 43. In this closed position, the internal sealing gasket 415 of the female body 41 is also tightly radially cooperating with the female valve 43, and the internal conduit 412 is closed. A spring 44 surrounding the central rod 42 is accommodated in the internal conduit 412. The spring 44 pushes the female valve 43 towards its closed position. In the closed position, the front end surface 431 of the female valve 43 and the front end surface 423 of the central rod 42 are at the same longitudinal level. The female valve 43 can be longitudinally moved between its closed position and an open position, in which the female valve 43 does not close the internal conduit 412 of the female coupling element 4 in the front longitudinal direction of the female fluid coupling element 4.

[0044] The front conical surface 411 of the concave body 41 converges in the longitudinal rear direction of the female fluid coupling element 4 to form a mouth of the female coupling element 4 through which the male fluid coupling element 2 can be introduced for coupling (connection).

[0045] At the beginning of the coupling process, the male coupling element 2 and the female coupling element 4 face each other along the longitudinal axis. Their longitudinal center axes X41, X21 may not be aligned, that is, their longitudinal center axes X41, X21 are parallel, but can be moved (about 1.25 mm), consistent with the radial gap between the collar 241 and the skirt 212. The male body 21 and the female body 41 approach each other, and if the longitudinal center axes X41, X24 are not aligned, the nose 242 contacts the front conical surface 411 of the female body 41. This contact causes the collar 241 to move inside the inner housing 23, so that the longitudinal center axis X24 of the nozzle 24 is aligned with the longitudinal center axis X41 of the female body 41.

[0046] When the nozzle 24 abuts against the female valve 43, the central stem 42 abuts against the male valve 26. The continued movement of the male body 41 in the female coupling element 4 causes the female valve 43 to be pushed backward by the nozzle 24 and the male valve 26 to be pushed backward by the central stem 42. The outer radial surface of the nozzle 24 is in close contact with the sealing gasket 415 of the female body 41. Then, when the female valve 43 and the male valve 26 are in their open positions and when the internal conduit 412 and the internal conduit 20 are in fluid communication, a connection state is reached. The fluid can pass through the rear portion 216, the nozzle 24 and the female body 41 in the internal conduits 20 and 412.

[0047] To uncouple the male fluid coupling element 2 and the female coupling element 4, the male body 21 is moved away from the female body 41. The female valve 43 and the male valve 26 follow the movement of the nozzle 24 and the central rod 42, respectively, pushed by their respective springs 44 and 27. The female valve 43 and the male valve 26 respectively cooperate with the central rod 42 and the female body 41 and the nozzle 24 to reach their closed position. The nozzle 24 moves away from the female body 41. The male coupling element 2 and the female coupling element 4 are ready again for the next coupling process.

[0048] Since the nozzle 24 is mounted with the possibility of radial displacement relative to the male body 21, the male coupling element 2 and the female coupling element 4 can be coupled even if their axes X21 and X41 are not aligned at the beginning of the coupling process.

[0049] The sealing during the displacement of the nozzle 24 is ensured by the sealing gasket 245, the compression of which is precisely controlled by the position of the support ring 22 relative to the skirt 212 after welding, that is, by the rear abutment of the first rear axial surface 224 of the support ring 22 with the first front axial annular surface 214 of the skirt 212.

[0050] Since the support ring 22 is welded and fixed in the skirt 212, there is no threaded fit between the support ring 22 and the skirt 212, and there is no curling structure between the support ring 22 and the skirt 212, so that the radial dimensions of the convex coupling element 2, especially at the level of the skirt 211, can adapt to all radial dimensions of the convex body 21, especially when the radial dimensions of the convex body 20 are small.

[0051] refer to Figure 6 and Figure 7 A second embodiment of the invention is described. Parts of the male fluid coupling element 2 ′ according to the second embodiment that have the same functions as those of the male fluid coupling element 2 according to the first embodiment have the same reference numerals.

[0052] The protrusion 21 is centered on the longitudinal center axis X21 and partially defines the internal conduit 20 of the male fluid coupling element 2'. The protrusion 21 has a rear portion 216 and a base 217 adjacent to the rear portion 216 in the front longitudinal direction F. The outer diameter size of the base 217 is greater than the outer diameter size of the rear portion 216 of the protrusion 21. The support ring 22 is longitudinally and radially fixed to the protrusion 21 by welding. Specifically, the weld bead 25 is located at the junction of the first front axial annular surface 214 of the protrusion 21 and the outer radial surface 218 of the protrusion 21, and at the junction of the first rear axial surface 224 of the support ring 22 and the outer radial surface 226 of the support ring 22.

[0053] The support ring 22 includes a base 227 and a skirt 222, and the skirt 222 extends from the base 227 in the rear longitudinal direction R. The support ring 22 adopts a one-piece design, so the base 227 and the skirt 222 are integral. The inner diameter of the base 227 is smaller than the inner diameter of the skirt 222. The skirt 222 forms a cylindrical surface 2221 as an inner surface. The cylindrical surface 2221 is matched with the cylindrical surface 2175 of the convex body 21 with a reduced radial clearance. In other words, by the radial cooperation of the cylindrical surface 2221 and the cylindrical surface 2175, the support ring 22 is centered on the longitudinal center axis X21. In particular, the base 217 forms an external groove 2171, which leads to the second front axial annular surface 215 of the base 217. The second front axial annular surface 215 of the base 217 defines the external groove 2171 in the rear longitudinal direction R. The cylindrical surface 2175 of the base 217 as the outer radial surface radially defines the outer groove 2171. The outer groove 2171 accommodates the rear portion of the skirt 222 in a configuration in which the skirt 222 and the protrusion 21 of the support ring 22 are fixed together. In particular, the first front axial annular surface 214 of the base 217 abuts against the first rear axial surface 224 in front. The cylindrical surface 225 radially faces the cylindrical surface 2175. The first rear axial surface 224 of the support ring 22 is formed at the rear end of the skirt 222.

[0054] The support ring 22 and the convex body 21 define an internal housing 23, in which a collar 241 of the nozzle 24 is mounted and can be displaced in a direction radial to the longitudinal center axis X21 relative to the convex body 21 and the support ring 22. The skirt 222 radially defines the internal housing 23. The nozzle 24 also has a nose 242 that protrudes from the support ring 22 in the front longitudinal direction F. The nozzle 24 defines the front part of the internal duct 20.

[0055] The male fluid coupling element 2' also includes a male valve 26, which can be longitudinally moved in the nozzle 24 between a closed position and an open position of the internal pipe 20. In the closed position, the male valve 26 is tightly fitted with the nozzle 24 and closes the internal pipe 20. In the open position, the male valve 26 is not tightly fitted with the nozzle 24, and wherein in the closed position of the male valve 26, the front surface 261 of the male valve 26 is at the same longitudinal level as the front end surface 248 of the nose 242.

[0056] The base 217 forms the second front axial annular surface 215 .

[0057] The slip ring 30 is mounted around the collar 241. The slip ring 30 is made of a polymer, in particular, a material having good friction properties, such as acetal. The slip ring 30 includes a front portion 301 and an annular radial portion 302. The inner diameter D302 of the annular radial portion 302 is equal to the diameter D244 of the second radially outer surface 244 of the collar 241, so that the annular radial portion 302 is in radial contact with the second radially outer surface 244 of the collar 241. Therefore, the slip ring 30 is radially fixed to the nozzle 24. Therefore, the slip ring 30 moves together with the collar 241 in the inner housing 23. In particular, the collar 241 equipped with the slip ring 30 is accommodated in the inner housing 23 and can be radially displaced relative to the convex body 21 and the support ring 22.

[0058] The front portion 301 is in rear contact with the annular front axial surface 247 of the collar 241 and in front contact with the second rear axial surface 223 of the support ring 22. Therefore, the slip ring 30 is longitudinally sandwiched between the support ring 22 and the collar 241. In particular, the sealing gasket 245 housed in the collar 241 is tightly fitted with the second front axial annular surface 215 of the base 217, and the slip ring 30 is in axial contact with the first rear axial surface 224 of the support ring 22.

[0059] The male fluid coupling element 2 ′ comprises a sealing gasket 245 housed in an annular rear axial surface 246 of the collar 241 and in tight contact with the second front axial annular surface 215 of the base 217 .

[0060] The male fluid coupling element 2' is configured to be coupled to the complementary female fluid coupling element 4 in the same coupling sequence as described in the first embodiment, and to be decoupled from the complementary female fluid coupling element 4 in the same decoupling sequence as described in the first embodiment.

[0061] Since the polymer slide ring 30 moves together with the collar 241 , the friction between the collar 241 and the support ring 22 is reduced, which helps the nozzle 24 to smoothly adapt its radial position to the position of the longitudinal center axis X41 of the female body 41 at the beginning of the coupling process.

[0062] In another embodiment, the annular front axial surface 247 of the collar 241 is preferably coated with a PVD (physical vapor deposition based) coating and is in direct contact with the support ring 22 .

[0063] In another embodiment, the slip ring has no annular radial portion and is in radial contact with the outer radial surface of the nozzle 24 .

[0064] Spot welding rather than a continuous weld bead ensures the fixation of the projection 24 to the support ring 22 .

Claims

1. A convex hydraulic coupling element (2, 2'), characterized in that: The male fluid coupling element comprises: A convex body (21), wherein the convex body (21) is centered on the longitudinal central axis (X21); a support ring (22) which is longitudinally and radially fastened to the male body (21), a first front axial annular surface (214) of the male body (21) being in contact with a first rear axial surface (224) of the support ring (22) in a front longitudinal direction (F) of the male fluid coupling (2), the support ring (22) and the male body (21) together defining an inner housing (23); a nozzle (24), the nozzle (24) being centered on a longitudinal center axis (X24) and comprising a collar (241) and a nose (242); the collar (241) being mounted in the inner housing (23) and being movable relative to the convex body (21) and the support ring (22) in a direction radial to the longitudinal center axis (X21); the nose (242) extending from the support ring (22) in the front longitudinal direction (F); the nozzle (24) and the convex body (21) defining an internal conduit (20) of the male fluid coupling; The support ring (22) is longitudinally and radially fixed to the protrusion (21) by welding.

2. The male fluid coupling element (2, 2') according to claim 1, characterized in that Through the radial cooperation between the cylindrical surface (225, 2221) of the support ring (22) and the cylindrical surface (2123, 2175) of the convex body (21), the support ring (22) is centered on the longitudinal central axis (X21).

3. Male fluid coupling element (2, 2') according to claim 1 or 2, characterized in that The support ring (22) is longitudinally and radially fixed to the protrusion (21) by a weld (25), and the weld (25) is located at the junction of the first front axial annular surface (214) of the protrusion (21) and the outer radial surface (218) of the protrusion (21), and at the junction of the first rear axial surface (224) of the support ring (22) and the outer radial surface (226) of the support ring (22).

4. The male fluid coupling element (2) according to claim 1 or 2, characterized in that The protrusion (21) includes a base (217) and a skirt (212), wherein the skirt (212) extends from the base (217) in a front longitudinal direction (F) and radially defines the inner shell (23), and wherein a first front axial annular surface (214) of the protrusion (21) is formed at a front end of the skirt (212).

5. The male fluid coupling element (2') according to claim 1 or 2, characterized in that The support ring (22) comprises a skirt (222) extending from a base (227) of the support ring (22) in a rear longitudinal direction (R) of the male fluid coupling element (2') opposite to the front longitudinal direction (F), wherein the skirt (222) radially defines the inner housing (23), and wherein a first rear axial surface (224) of the support ring (22) is formed at a rear end of the skirt (222).

6. Male fluid coupling element (2') according to claim 1 or 2, characterized in that The male fluid coupling element (2') comprises a slip ring (30) made of a polymer, which is longitudinally clamped between the shaft ring (241) and the support ring (22) and radially fixed to the nozzle (24).

7. The male fluid coupling element (2) according to claim 1 or 2, characterized in that The support ring (22) forms a second rear axial surface (223) which is in direct contact with the annular front axial surface (247) of the collar (241), and wherein the second rear axial surface (223) is coated with a coating based on physical vapor deposition.

8. Male fluid coupling element (2, 2') according to claim 1 or 2, characterized in that The male fluid coupling element (2, 2') comprises a male valve (26) which is longitudinally movable within the nozzle (24) between a closed position and an open position of the internal conduit (20), wherein in the closed position the male valve (26) fits tightly with the nozzle (24) and closes the internal conduit (20), and in the open position the male valve (26) does not fit tightly with the nozzle (24), and wherein in the closed position of the male valve (26), a front end surface (262) of the male valve (26) is at the same longitudinal level as a front end surface (248) of the nozzle (24).

9. Male fluid coupling element (2, 2') according to claim 1 or 2, characterized in that The male fluid coupling element (2, 2') comprises a sealing gasket (245) which is housed in an annular rear axial surface (246) of the collar (241) and is in tight contact with a second front axial annular surface (215) of the male body (21), which longitudinally defines the inner housing (23).

10. A hydraulic coupling (1), characterized in that The fluid coupling (1) comprises a convex fluid coupling element (2, 2') and a complementary concave fluid coupling element (4) as claimed in claim 1 or 2, wherein the complementary concave fluid coupling element (4) has a concave body (41), wherein the concave body (41) defines an internal conduit (412) of the complementary concave fluid coupling element (4) and forms a front conical surface (411), wherein the front conical surface (411) is used to contact the nose (242) of the nozzle (24) when the longitudinal center axis (X24) of the nozzle (24) is misaligned with the longitudinal center axis (X41) of the concave body (41) during the coupling process between the convex fluid coupling element (2, 2') and the complementary concave fluid coupling element (4).

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