Plastic Twin Jet Piston Cooling Nozzle

Abstract

A fluid nozzle, particularly for engine piston cooling fluid, comprising a hollow supply body (11) connected to a conduit structure (15) having a free end (15.2) forming a discharge end with discharge ports (17a, 17b) for discharging the fluid, the supply body and the conduit structure forming a single block of plastic material.

Description

[Technical Field]

[0001] The present invention relates to the field of fluid nozzles, particularly in cooling systems for engines, and provides an improved nozzle and method for manufacturing such a nozzle. [Background technology]

[0002] Piston cooling nozzles for internal combustion engines enable a cooling fluid, such as oil, to be sprayed onto at least one suitable zone of the piston.

[0003] Piston cooling nozzles are typically formed by inserts mounted in the crankcase and communicating with the cooling fluid supply port, and are precisely positioned to provide a jet of cooling fluid directed at a precise zone on the piston top or piston gallery inlet.

[0004] A piston cooling nozzle implemented by applicant is shown in Figures 1A, 1B and 1C (showing views of the part from two separate parallel cross sections).

[0005] It consists of a hollow metal supply body 1 and a metal tube 2, typically made of steel, which fits into the hollow body 1 and communicates with a fluid passage 4 formed within the hollow body 1. The tube 2 terminates in a metal end cap 3, which has a hole 6 for oil drainage.

[0006] The feed body 1, tube 2 and end cap 3 are typically made from steel, which can be difficult to machine and can present weight issues.

[0007] Typically, the tube 2 is assembled to the hollow body 1 by soldering. The end caps 3 are also shrink-fit and soldered to the metal tube 2.

[0008] Repeatability of assembly to ensure uniformity of nozzle size and operation can be problematic, and soldered assembly can be expensive. Summary of the Invention [Problem to be solved by the invention]

[0009] There is a problem in creating a new nozzle design that improves on at least one of the above-mentioned drawbacks. [Means for solving the problem]

[0010] One embodiment of the present invention provides a fluid nozzle part or component, in particular a cooling fluid nozzle, said part or component comprising a supply body with a so-called "mounting" surface and a so-called "support" surface opposite the mounting surface, and an axial passage between the mounting surface and the support surface, said axial passage communicating with a lateral opening provided in the supply body, said member or part further comprising a conduit structure communicating with said lateral opening, said conduit structure being connected to the supply body by a first end, said conduit structure including a free end extending transversely to the supply body and forming a discharge end to which one or more discharge ports for discharging the fluid are attached, said supply body and said conduit structure being formed in a single block based on said plastic material and / or polymer.

[0011] Such components reduce weight and cost compared to mechanically welded nozzles, and the number of parts required to assemble the nozzle can be reduced.

[0012] By making the supply body and conduit structure from a single block of plastic material, precise dimensions of the part and precise positioning of the fluid discharge port within the part can be obtained, especially compared to nozzles that are assembled to a tube and where discharge is assured by a brazed end cap, which requires correct orientation control.

[0013] Typically, the fluid nozzle is a cooling nozzle for an engine, particularly an internal combustion engine.

[0014] Advantageously, the nozzle may further comprise at least one mounting member configured to mount said supply body to a fluid supply device.

[0015] The nozzle may be provided with an adjusting member, such as a valve and / or a flap, for adjusting fluid access within said conduit structure.

[0016] Particularly advantageously, the attachment and adjustment elements are achieved by means of flap screws accommodated in said axial passages.

[0017] According to one particular embodiment, a metal insert is provided between the flap screw and the supply body and housed in the axial passage, the metal insert including an outer surface abutting the inner wall of the supply body, and the metal insert is provided with a side through hole communicating with the lateral opening.

[0018] According to one advantageous embodiment, the metal insert may be provided with a positioning structure, in particular a flat, configured to be placed on a positioning element of the inner wall of the feed body, which may be similar to or complementary to the positioning structure of the insert.

[0019] According to one possible embodiment, the nozzle may comprise a mounting plate made of a metal material and / or of a material more rigid than said plastic material, said mounting plate being arranged on said mounting surface of said supply body.

[0020] It is possible to use mounting elements, for example hollow screws or flap screws, which are provided with a shoulder, which is advantageously arranged to abut against the mounting plate.

[0021] According to one possible embodiment of the nozzle, the latter may further comprise a seal interposed between the head of said flap screw or hollow screw and said support surface of said supply body.

[0022] The conduit structure may include a fluid channel having one end communicating with the lateral opening and another end communicating with several fluid discharge ports having different orientations.

[0023] Constructing the conduit structure from a plastic material allows for easy realization of ports of various shapes, which improves the performance of the fluid jet, particularly the effective flow rate and atomization accuracy.

[0024] Advantageously, said one or more fluid ejection ports have a polygonal cross section or a cross section in the form of a series of curved portions forming a closed contour.

[0025] According to another aspect, the invention relates to a piston cooling device for an internal combustion engine, comprising a fluid nozzle as defined above.

[0026] According to another aspect, the present invention provides a method for manufacturing a method of manufacturing a semiconductor device comprising: an engine block and a piston slidably mounted in said engine block; - a cooling device as defined above; The present invention relates to an internal combustion engine including:

[0027] According to another aspect, the invention relates to a method for manufacturing the above-mentioned fluid nozzle member, which method comprises a step of moulding said block of plastic and / or polymer material, in particular an injection moulding process.

[0028] Such methods allow for rapid manufacture of the nozzle, good dimensional repeatability of the parts forming the supply body and conduit, a limited number of assembly operations compared to mechanically welded nozzles, and more complex fluid outlet shapes than metal parts.

[0029] According to one particular embodiment, the molding can be carried out in such a way that the plastic block is overmolded onto a metal plate on the mounting surface.

[0030] According to an advantageous aspect of the method, the mold used in the molding step is provided with a shank and one or more shafts of a shape complementary to the discharge port and the channel in the conduit structure, respectively.

[0031] According to another aspect, the invention relates to a method for manufacturing a fluid nozzle as defined above.

[0032] The present invention will be better understood with the aid of the following description and the accompanying drawings. [Brief explanation of the drawings]

[0033] [Figure 1A] 1 shows a perspective view of a conventional metal nozzle formed by assembling metal pieces by soldering. [Figure 1B] 1 shows a perspective view of a conventional metal nozzle formed by assembling metal pieces by soldering. [Figure 1C] 1 shows a cross-sectional view of a conventional metal nozzle formed by assembling metal pieces by soldering. [Figure 2A] 1 shows a perspective view of the parts made of plastic material forming the supply body and the discharge conduit of a nozzle according to the invention; [Figure 2B] 1 shows a bottom view of the parts made of plastic material that form the supply body and discharge conduit of a nozzle according to the invention; [Figure 3] FIG. 10 is a cross-sectional view of the assembly of the plastic part and the flap screw. [Figure 4A] 1 shows a perspective view of a particular exemplary embodiment of a nozzle in which a metal insert is attached to a part made of plastic material; [Figure 4B] 1 shows a bottom view of a particular exemplary embodiment of a nozzle in which a metal insert is attached to a part made of plastic material; [Figure 4C] FIG. 1 is a perspective view of a metal insert. [Figure 5]1 is a perspective view of a particular exemplary embodiment of a nozzle in which a seal is provided between the head of the attachment member and the face of a part made of plastic material; [Figure 6A] 1 illustrates a cross-sectional view of an exemplary embodiment of a nozzle having a plastic part overmolded onto a rigid mounting plate. [Figure 6B] 1 illustrates a perspective view of only the mounting plate of an exemplary embodiment of a nozzle having a plastic part overmolded onto a rigid mounting plate. [Figure 7A] 10A-10C show different shapes of fluid discharge ports provided in the plastic parts that form the supply body and discharge conduit of the nozzle. [Figure 7B] 10A-10C show different shapes of fluid discharge ports provided in the plastic parts that form the supply body and discharge conduit of the nozzle. [Figure 7C] 10A-10C show different shapes of fluid discharge ports provided in the plastic parts that form the supply body and discharge conduit of the nozzle. [Figure 7D] 10A-10C show different shapes of fluid discharge ports provided in the plastic parts that form the supply body and discharge conduit of the nozzle. [Figure 7E] 10A-10C show different shapes of fluid discharge ports provided in the plastic parts that form the supply body and discharge conduit of the nozzle. [Figure 8] 1 shows a diagram of an apparatus for molding nozzle plastic parts. DETAILED DESCRIPTION OF THE INVENTION

[0034] In order to make the figures more legible, the various parts shown in the figures are not necessarily drawn to uniform scale.

[0035] In the following description, terms that depend on the orientation of a structure, such as "front," "top," "back," "bottom," and "side," are applied assuming that the structure is oriented as shown in the figure.

[0036] 2A-2B (showing a three-dimensional view and a bottom view, respectively) illustrate an exemplary embodiment of a component 10 of a fluid nozzle according to one embodiment of the present invention.

[0037] The nozzle is in particular a nozzle for a cooling fluid, such as oil, intended to spray this fluid onto one or more piston zones of a combustion engine.

[0038] The part 10 comprises a parallelepiped-shaped part 11, in this example called a "supply body", which is connected to a fluid supply device (not shown). A so-called "mounting" surface 11b can therefore be added to this fluid supply device, for example to a crankcase to which cooling fluid is intended to be delivered.

[0039] The supply body 11 is hollow and includes an internal axial passage 12 extending from the mounting surface 11b to the so-called "support" surface 11a opposite the mounting surface 11b. The axial passage 12 is bounded by at least one internal wall 121 of the supply body 10 and communicates with a lateral opening 13 formed in the internal wall 121. Fluid enters the part 10 at the mounting surface 11b side of the supply body 11, passes through the axial passage 12, and passes through the lateral opening 13.

[0040] The component 10 is provided with another elongated or rectangular portion 15, referred to as a "conduit structure," which is connected to the supply body by a first end 15.1 and extends from the side of the supply body to a free end 15.2 that forms a fluid discharge. Fluid is discharged through at least one fluid discharge port provided at the free end 15.2 of the conduit structure.

[0041] Component 10 is characterized as being one-piece, with the conduit structure and supply body formed from a single piece. The one-piece design offers advantages in dimensional and functional repeatability over nozzles that are an assembly of several components, typically a supply body and fluid tubing, to which a discharge end cap is added.

[0042] The component 10 is typically made from at least one plastic material or at least one polymer material to be economical, save weight, and facilitate one-step production, for example by molding. Glass-filled polymers and reinforced materials can also be used.

[0043] Preferably, the plastic material is selected to withstand thermal cycling between −40° C. and 140° C. The plastic material may be, for example, a polyamide such as PA66 or PA6-6T, polyphthalamide (PPA), polyphenylene sulfide (PPS).

[0044] Another criterion is compatibility with the fluid used: for example, if this fluid is cooling oil, a plastic material is selected that is chemically resistant to this oil.

[0045] For example, a multi-material plastic part 10 may be provided having zones made of a softer plastic material than other zones made of a different plastic material.

[0046] The use of a one-piece plastic part 10 further avoids one or more soldering operations as occurs in manufacturing nozzles according to the prior art by assembling a supply body, a fluid conduit, and possibly a discharge end cap.

[0047] To obtain better durability of the component 10, it is advantageous to use a flexible plastic material, which in this case may be an unfilled glass fiber polymer.

[0048] In the illustrated example, the conduit structure 15 includes a channel 16 that communicates with the lateral opening 13 and leads to several fluid discharge ports 17a, 17b. After passing through the supply body 11 and the lateral opening 13, the fluid passes through the channel and exits the part 10 through the ports 17a, 17b.

[0049] According to one possible embodiment shown in Figure 2A, the conduit structure may comprise a straight channel 16 extending in the Y1Y2 direction and forming an angle α different from 90°, for example an angle α greater than 90°, with the main axis X1X2 of the passage 12. The axis X1X2 is perpendicular to the mounting surface 11b in this particular example.

[0050] The ports 17a, 17b advantageously have different orientations relative to each other and to the channel 16. This allows the fluid to be discharged to different targets. For example, in the case of a cooling nozzle, different zones of the piston mechanism can be cooled. A piston cooling nozzle can be designed to perform two functions, for example, piston cooling via the piston gallery and lubrication of the piston / connecting rod shaft.

[0051] Furthermore, the use of plastic material to make the component 10 offers the possibility to easily provide different configurations and shapes of the exhaust ports 17a, 17b and / or the channels 16. Tori

[0052] An attachment member (not shown in Figures 2A-2B) is intended to be inserted into the axial passage 12. This attachment member, formed for example by a hollow screw or a flap screw, is typically configured to attach the supply body 11 to a fluid supply device (not shown) while allowing fluid flow from the axial passage 12 to the lateral opening 13. In particular, the attachment member may be provided to hold the mounting surface 11b of the part 10 against the fluid supply device (not shown) or against a bracket itself placed against the fluid supply device.

[0053] In the particular embodiment shown in Figure 3, the mounting member is a hollow screw 20 including a head 21 that is positioned against and in contact with the support surface 11b of the part 10. The screw 20 includes, as an extension of the head 21, a hollow threaded shank 22 housed in the axial passage 12. The hollow shank 22 includes a portion 22.1 that protrudes from the mounting surface 11b. This portion 22.1 may be intended to engage, for example, with a pipe in an engine block or a bore of a fluid supply device such as an oil pan. This portion 22.1 is optional.

[0054] To allow the passage of fluid, at least one axial cavity 24a extending within the shank 22 is open at one end to a fluid supply device. As an extension of the axial cavity 24a, the shank 22 of the screw 20 includes a radial cavity 24b which may communicate with the lateral opening 13 of the part 10.

[0055] 3, a flap screw 20 is advantageously used which further provides the ability to regulate fluid access to the conduit structure 15 of the part 10. A pressure-sensitive shut-off flap 25 is here provided in the hollow portion of the screw 20, which is configured to alternately block fluid access to the conduit structure 15 of the part 10 and allow fluid access to the conduit structure 15 of the part 10 depending on the fluid pressure.

[0056] In the particular example shown in Figure 3, the flap 25 may be formed from at least one closure element 25.1, for example in the form of a ball, which is able to close a section of the axial cavity 22a. The closure element 25.1 is arranged against a spring 25.2 supporting a cover 25.3 and is provided to close another section of the axial cavity 22a and block the fluid passage to the lateral opening 13 of the part 10, in particular as long as the fluid pressure is below a predetermined pressure threshold. Other types of flap screws may also be used, for example flap screws including a piston as a closure element.

[0057] The nozzle operates as follows: under a certain fluid pressure, for example when engine oil pressure exceeds a predetermined threshold, the valve is moved to an open position by the displacement of the ball 25.1. The fluid passes through the radial cavity 24b, which communicates with the lateral opening 13 of the part 10, into the main channel 16 of this part 10, and finally through the outlet ports 17a, 17b at the free end 15.2 of the conduit structure 15.

[0058] Figure 3 shows the flap in a closed position preventing fluid flow within the conduit structure 15, the fluid path taken when the flap is in the open position being represented diagrammatically by arrow F1.

[0059] 3, the nozzle can be provided with a hollow screw-type fitting through which fluid is intended to pass, without necessarily having an integral closure or flap. In this case, control of the fluid inlet in conduit structure 15 can be offset from part 10 via another structure, for example, the screw and a solenoid valve external to part 10. Alternatively, in some applications, a nozzle can be provided without a closure that can prevent fluid flow from a fluid supply into conduit structure 15.

[0060] To improve the mounting of the part 10 made of plastic material with the at least partly metallic mounting element, a metal insert 30, for example made of steel, can be provided in the passage 12 against the inner wall 12.1 and arranged between this inner wall 12.1 and the mounting element. The insert 30 also ensures that the screw head is centered and the nozzle is correctly positioned.

[0061] 4A-4B, which respectively show a three-dimensional view and a bottom view of the part 10 without the mounting member, a metal insert 30 can be seen housed within the axial passage 12. In this example, the insert has the appearance of a cylindrical tube. To allow fluid passage to the channel 16, the metal insert 30 housed in the axial passage includes side holes 32 penetrating its wall and communicating with the lateral opening 13. To ensure proper orientation of the insert side holes 32 with the lateral opening 13 leading to the channel 16, the insert 30 can be provided with positioning structures. The positioning structures may be located on positioning elements on the inner wall 121 of the feed body 11. In the illustrated example, the positioning structures are flat portions 31 positioned against corresponding flat portions 121a or corresponding planar zones 121a of the inner wall 121 of the feed body 11. The flat portions provide a simple means of ensuring the orientation of the holes 32 relative to the lateral opening 13, thus ensuring full communication between the holes 32 and the lateral opening 13 and ensuring fluid passage within a controlled diameter zone. Alternatively, other means may be provided to prevent rotation, such as grooves or a hexagonal cross section along an axis parallel to the axes X1X2.

[0062] The insert 30, which can be seen in isolation in FIG. 4C, is typically press fit into the passage 12 of the plastic body 11.

[0063] Further examples of embodiments that allow for improved attachment of component 10 are shown in Figures 5 and 6A-6B.

[0064] To limit the contact pressure exerted by the mounting member on the fluid supply device to which the component 10 is attached, a rigid openwork mounting plate 50 may be provided which is positioned against the mounting surface 10b of the supply body 11. The mounting plate 50 is made of a material which is more rigid than the material from which the component 10 is made. Typically, the mounting plate 50 is made of a metal, for example steel.

[0065] In this case, the mounting members, in particular the screws or flap screws 20 passing through the holes 51 in the plate 50, may be provided with shoulders 223 configured to abut the mounting plate 50. The clamping force is then applied to the plate 50 rather than to the fluid supply or the engine block.

[0066] A rigid plate 50 may also be added to the plastic part 10 to ensure compatibility of the nozzle and allow it to be attached to a metal bracket of the fluid supply device.

[0067] For example, such a plate 50 can enable the plastic part 10 to be attached to an engine block made of a ductile material, such as an aluminum alloy, to which metal nozzles are typically attached. In such engine blocks, excessive contact pressure during tightening can cause undesirable plastic deformation of the area in contact with the screw. Adding a plate 50 between the shoulder 223 of the screw 20 and the engine block (not shown) allows the tightening force to be distributed over a larger surface area, reducing the contact pressure and ultimately avoiding deformation of the engine block during assembly of the nozzle onto the engine.

[0068] In addition to the openings for the attachment members to pass through, the plate 50 may be provided with at least one protruding member such as at least one hole or pin to make the assembly with the supply body 11 more robust, and the supply body may be provided with a corresponding pin or a corresponding hole.

[0069] Plate 50 may also be provided with at least one protruding member, such as at least one hole or pin, to allow for proper orientation of the nozzle relative to the fluid supply or engine block.

[0070] 5 and 6A, to improve assembly, a seal 60, for example in the form of a flat openwork disc, can be provided between the head 21 of the screw 20 and the bearing surface 11a of the body 11. The seal 60 can be, for example, a fluorocarbon elastomer.

[0071] When the nozzle is subjected to high thermal stresses, the seal 60 can also compensate for the difference in expansion between the plastic body 11 and the typically metal screw 20. This ensures correct positioning of the attachment member, which also serves as a fluid channel. The seal 60 also ensures a reliable gas-tight seal. In particular, the additional seal 60 below the head of the screw 20 ensures a seal over the entire operating temperature range of the nozzle.

[0072] In the particular embodiment shown in Figures 5 and 6A, the assembly includes a mounting plate 50 but no insert, thereby reducing the cost of the nozzle. Figure 6B shows a view of the plate 50 in isolation.

[0073] Alternatively, and particularly to ensure a certain level of robustness, an assembly can be made with both the mounting plate 50 and the metal insert 30 described above.

[0074] According to another alternative, the assembly can be made without the use of mounting plate 50 using screws with shoulders 223, as shown in FIG. 6A.

[0075] Using a plastic material to create the above-mentioned conduit structure and providing at least one discharge port 17a for discharging fluid from the nozzle also facilitates realization of different port shapes (Figures 7A to 7E).

[0076] Apart from the circular cross section 175 shown in Figure 7A, ports can be provided with polygonal cross sections or with several curves. This cross section influences the desired jet quality and jet velocity at the nozzle exit. It can also be adjusted depending on the amount of fluid over a given time, also called the effective flow rate, that is intended to be sprayed onto a target zone, such as a piston to be cooled.

[0077] In the example shown in Figure 7B, the cross section 171 of the port 17a is formed by a series of curved sections, e.g., circles, forming a closed contour. In Figure 7C, the port 17a has a polygonal, particularly hexagonal, cross section 172, while the discharge ports 17a shown in Figures 7D and 7E are provided with triangular 173 or rectangular 174, particularly square, cross sections. Such shapes may be provided to create zones for accelerating the fluid jet.

[0078] An exemplary method for manufacturing a fluid nozzle according to the present invention will now be described.

[0079] In a first step, the part 10 shown in Figures 2A-2B is formed, for example by molding a plastic or polymer material. The supply body and the conduit structure are made in a single piece and in one operation. In particular, an injection molding method may be implemented.

[0080] At least one thermoformable polymer-based material, such as PA66, PA6-6T, PPA, or PPS, can be used. The material is heated to soften it, then poured into a mold and cooled. For example, a mold 180 such as that shown in FIG. 8 can be used.

[0081] To enable the fluid discharge ports 17a, 17b, lateral openings 13, and channels 16 of part 10 to be formed in a single operation, the mold may be provided with, among other things, shafts 181a, 181b of a shape complementary to that of fluid discharge ports 17a, 17b, and a shank 182 that penetrates the material to be structured and has a shape complementary to that of channels 16. Passages 12 are typically made in this same operation.

[0082] Advantageously, molding of some polymer or plastic materials can be performed to create the nozzle components.

[0083] If the nozzle 10 is provided with a mounting plate 50 as shown in Figures 6A and 6B, the part 10 can be overmolded onto this plate 50 during the molding operation. In this way, a rigid assembly can be achieved between the plastic part 10 and a mounting plate made of a different material, such as steel.

[0084] Once the part 10 is formed, if an insert 60 such as that shown in Figures 4A-4B is provided, the insert is press fit into the passage 12 of the feed body.

[0085] Assembly of the nozzle to the fluid supply system is then accomplished by introducing a mounting member, typically a hollow screw or flap screw, into the passage 12 .

[0086] As indicated above, the part 10 made of plastic material and the various assemblies described above are particularly intended to form an engine cooling system for spraying a cooling fluid, such as oil, onto one or more target zones of the piston mechanism of the engine.

[0087] Such components and such assemblies can be used in other types of devices, for example in hydraulic or pneumatic devices of motor vehicles, in particular in the hydraulic circuits of internal combustion engines, or for example for spraying lubricating oil onto chains or as cooling nozzles for electric motors in electric vehicles. [Explanation of symbols]

[0088] 10 parts 11 Supply body 11b Mounting surface 11a Support surface 12 Axial passage 13 Lateral opening 15 Conduit structure 15.1 First End 15.2 Free end 16 fluid channels 17a, 17b exhaust port 20 Mounting parts, flap screws, hollow screws 21 head 22 Shank 24a Axial cavity 24b Radial cavity 25 Adjustment member, flap 25.1 Closures 25.2 Springs 25.3 Cover 30 Metal Inserts 31 Positioning structure 32 Side hole 50 Mounting Plate 60 stickers 121 Interior wall 121a Flat Zone 223 Shoulder

Claims

1. a fluid nozzle member having a supply body (11) including a mounting surface (11b) and a support surface (11a) opposite the mounting surface, and an axial passage (12) between the mounting surface and the support surface, the axial passage (12) communicating with a lateral opening (13) provided in the supply body; the fluid nozzle member further including a conduit structure (15) communicating with the lateral opening (13), the conduit structure being connected to the supply body by a first end, the conduit structure including a free end (15.2) extending transversely to the supply body and forming a discharge end to which one or more discharge ports (17a, 17b) are attached for discharging a fluid; the supply body and the conduit structure are formed from a single block of plastic or polymer material; The fluid nozzle member further comprises a mounting plate (50) made of a metal material and / or a material having a higher rigidity than the plastic material, the mounting plate (50) being assembled to the mounting surface (11b) of the supply body (11).

2. 2. The fluid nozzle member of claim 1, further comprising a metal insert (30) housed within the axial passage (12), the metal insert including an outer surface that abuts an inner wall (121) of the feed body, the metal insert having a side hole (32) therethrough that communicates with the lateral opening (13).

3. 3. The fluid nozzle member according to claim 2, wherein the metal insert (30) is fitted with a positioning structure (31), in particular a flat structure, configured to be placed on a positioning member of the supply body, in particular on a flat zone (121a) of the inner wall.

4. 4. The fluid nozzle member of claim 1, wherein the conduit structure includes a fluid channel having one end communicating with the lateral opening and another end communicating with a plurality of fluid discharge ports, the plurality of fluid discharge ports having different orientations.

5. A fluid nozzle member according to any one of the preceding claims, wherein the one or more fluid ejection ports (17a, 17b) have a polygonal cross section or a cross section in the form of a series of curved segments forming a closed contour.

6. A fluid nozzle member according to any one of claims 1 to 5; at least one mounting member (20) for mounting the supply body (11) of the fluid nozzle member to a fluid supply device; A fluid nozzle assembly comprising:

7. A fluid nozzle member according to any one of claims 1 to 5; and an adjusting member (25) for adjusting fluid access to said conduit structure (15).

8. A fluid nozzle member according to any one of claims 1 to 5; a flap screw (20) housed within the axial passage (12); A fluid nozzle comprising:

9. 9. The fluid nozzle of claim 8, wherein the flap screw (20) is provided with a shoulder (223) configured to abut against a mounting plate (50) made of a metal material and / or a material having a higher rigidity than the plastic material, and the mounting plate (50) is assembled to the mounting surface (11b) of the supply body (11).

10. 10. The fluid nozzle according to claim 8 or 9, further comprising a seal (60) interposed between the head (21) of the flap screw (20) and the support surface (11a) of the supply body (11).

11. A piston cooling device for an internal combustion engine, comprising the fluid nozzle according to any one of claims 7 to 10.

12. an engine block and a piston slidably mounted in the engine block; A cooling device according to claim 11; Internal combustion engines, including:

13. A method for manufacturing a fluid nozzle member according to any one of claims 1 to 5, comprising a moulding step, in particular an injection moulding step, of a block of said plastic material.

14. 14. The method of claim 13, wherein the molding step is performed to overmold the block of plastic material onto a metal plate (50) that contacts the mounting surface.

15. 15. The method according to claim 13 or 14, wherein the conduit structure comprises a channel (16) and an evacuation port (17a, 17b) formed simultaneously during a molding step using a molding device comprising a mold (180), a shank (182), and one or more shafts (181a, 181b).

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