Double jet stream piston cooling nozzle made of plastic material

Abstract

A fluid nozzle, in particular for engine piston cooling fluid, comprising a hollow supply body (11) connected to a duct structure (15) provided with a free end (15.2) forming a discharge end provided with holes (17a, 17b) for the discharge of the fluid, the supply body and the duct structure being formed from a single block of plastic material.

Description

Technical Field

[0001] This invention relates to the field of fluid nozzles (particularly fluid nozzles for engine cooling systems), and provides an improved nozzle and a method for manufacturing such a nozzle. Background Technology

[0002] Piston cooling nozzles in an internal combustion engine allow cooling fluid (such as oil) to be sprayed onto at least one appropriate area of ​​the piston.

[0003] Piston cooling nozzles are typically formed from inserts that are attached to the crankcase and communicate with cooling fluid delivery ports. The position of the cooling nozzles is precisely determined to provide a jet of cooling fluid directed to a precise area on the top of the piston or to the piston passage inlet.

[0004] The piston cooling nozzle implemented by the applicant is in Figure 1A , Figure 1B , Figure 1C (The view showing the device viewed from two different and parallel cross-sections is shown in the image.)

[0005] The piston cooling nozzle includes a hollow metal supply body 1 and a metal tube 2, typically made of steel, which is fitted into the hollow body 1 and communicates with a fluid passage 4 formed within the hollow body 1. The tube 2 terminates at a metal end cap 3. The end cap 3 has orifices 6 to allow oil to drain.

[0006] The main body 1, pipe 2 and end cap 3 are usually made of steel, which makes them difficult to machine and causes weight problems.

[0007] Typically, tube 2 is brazed onto the hollow body 1. End cap 3 is also cold-shrinked onto the metal tube 2 and brazed onto the metal tube.

[0008] Ensuring consistent nozzle size and operation during assembly raises concerns about repeatability. Furthermore, brazing assembly is expensive.

[0009] This raises the issue of manufacturing a new nozzle structure that improves upon at least one of the aforementioned drawbacks. Summary of the Invention

[0010] One embodiment of the present invention provides a fluid nozzle device or element (particularly a cooling fluid nozzle), the device or element comprising a supply body having a so-called "attachment" surface, a so-called "support" surface opposite the attachment surface, and an axial channel between the attachment surface and the support surface, the axial channel communicating with a lateral opening provided in the supply body. The element or device further comprises a conduit structure communicating with the lateral opening, the conduit structure being connected to the supply body via a first end, the conduit structure extending laterally relative to the supply body, and the conduit structure including a free end forming a discharge end having one or more discharge ports for discharging the fluid. The supply body and the conduit structure are formed from a single block based on a plastic material and / or polymer.

[0011] Compared to mechanically welded nozzles, this device offers reduced weight and cost. It also reduces the number of parts required to assemble the nozzle.

[0012] The single-block form of the plastic material supply body and the piping structure enable precise dimensions of the device and precise positioning of the fluid discharge port within the device, especially compared to the nozzle described below, in which discharge is ensured by assembling and brazing an end cap to a tube whose correct orientation must be controlled.

[0013] Typically, fluid nozzles are cooling nozzles used in engines (especially internal combustion engines).

[0014] Advantageously, the nozzle may also include at least one attachment member configured to attach the supply body to the fluid supply device.

[0015] The nozzle may be equipped with regulating elements (such as valves and / or valve discs) for regulating the flow of fluid into the pipe structure.

[0016] Particularly advantageously, the attachment members and adjusting elements are achieved by means of a valve disc screw housed in the axial channel.

[0017] According to a particular embodiment, a metal insert is disposed between the valve disc screw and the supply body and accommodated in the axial channel. The metal insert includes an outer surface that presses against the inner wall of the supply body and is provided with a side through hole communicating with the lateral opening.

[0018] According to an advantageous embodiment, the metal insert may be provided with a positioning structure (particularly a flat portion) configured to be positioned on a positioning element on the inner wall of the supply body. This positioning element may be similar to or complementary to the positioning structure of the insert.

[0019] According to one possible implementation, the nozzle may be provided with an attachment plate made of a metallic material and / or a material with higher rigidity than the plastic material, the attachment plate being arranged on the attachment surface of the supply body.

[0020] An attachment member, such as a hollow screw or a valve screw with a shoulder, can be used. Advantageously, the shoulder is configured to abut against the attachment plate.

[0021] According to one possible embodiment of the nozzle, the nozzle may also be provided with a seal that is inserted between the head of the valve disc screw or the hollow screw and the support surface of the supply body.

[0022] The pipe structure may be provided with a fluid passage having one end communicating with the lateral opening and another end communicating with a plurality of fluid discharge ports having different orientations.

[0023] The pipe structure made of plastic materials makes it easy to achieve ports of different shapes, which can bring about gains in fluid jet performance, especially to obtain better useful flow rate and better spraying accuracy.

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

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

[0026] According to another aspect, the present invention relates to an internal combustion engine comprising:

[0027] - Engine block and piston slidably mounted in said engine block,

[0028] - The cooling device as specified above.

[0029] According to another aspect, the present invention relates to a method for manufacturing a fluid nozzle element as defined above, the method comprising the step of molding (particularly injection molding) a block of plastic and / or polymer material.

[0030] This method enables the nozzles to be manufactured quickly and has good dimensional repeatability in forming the supply body and pipe. Compared with mechanically welded nozzles, this method allows for limiting the number of assembly steps and enables the production of fluid outlets with more complex shapes than in metal devices.

[0031] According to one particular embodiment, molding can be performed by overmolding the plastic block onto a metal plate on the attachment surface.

[0032] According to an advantageous aspect of the method, the mold used in the molding step is provided with rods and one or more shafts, which are respectively complementary to the corresponding shapes of the discharge ports and passages in the pipe structure.

[0033] According to another aspect, the present invention relates to a method for manufacturing a fluid nozzle as defined above. Attached Figure Description

[0034] The invention will be better understood using the following description and accompanying drawings, in which:

[0035] Figure 1A , Figure 1B , Figure 1C A perspective view and a cross-sectional view of a conventional metal nozzle formed by assembling metal devices by brazing are shown;

[0036] Figure 2A , Figure 2B A perspective view and a bottom view are shown of a device that forms the supply body and discharge pipe of the nozzle according to the invention and is made of plastic material;

[0037] Figure 3 It is a cross-sectional view of the assembly of plastic parts and valve disc screws;

[0038] Figure 4A , Figure 4B A perspective view and a bottom view of a particular exemplary embodiment of the nozzle are shown, wherein a metal insert is mounted on a device made of plastic material;

[0039] Figure 4C A perspective view of the metal insert is shown;

[0040] Figure 5 This is a perspective view of a particular exemplary embodiment of the nozzle, wherein a seal is disposed between the head of the attachment member and the face of the device made of plastic material;

[0041] Figure 6A , Figure 6B Cross-sectional views of an exemplary embodiment of the nozzle and perspective views of a separate attachment plate are shown, wherein the plastic device is overmolded onto the rigid attachment plate.

[0042] Figure 7A , Figure 7B , Figure 7C , Figure 7D , Figure 7E Different shapes of fluid discharge ports are shown in the plastic device that forms the supply body and discharge pipe of the nozzle;

[0043] Figure 8 A view of an apparatus for molding plastic nozzle components is shown.

[0044] The various components shown in the accompanying drawings are not necessarily shown at a consistent scale to make the drawings easier to read.

[0045] Furthermore, in the following description, when taking into account the orientation of the structure as shown in the attached figures, terms such as “front,” “upper,” “rear,” “lower,” and “side” according to the orientation of the structure shall apply. Detailed Implementation

[0046] exist Figures 2A to 2B An exemplary embodiment of a fluid nozzle device 10 according to an embodiment of the present invention is shown in (a three-dimensional view and a bottom view are shown respectively).

[0047] Specifically, the nozzle can be a nozzle for a cooling fluid (such as oil) and is used to spray that fluid onto one or more piston regions of the combustion engine.

[0048] Device 10 includes a component 11, which in this example has a parallelepiped shape and is referred to as the "supply body," which is connected to a fluid supply device (not shown). Thus, the so-called "attachment" surface 11b can be abutted against the fluid supply device, for example against a crankcase used to transfer cooling fluid.

[0049] The supply body 11 is hollow and includes an inner axial channel 12 extending from the attachment surface 11b to a so-called "support" surface 11a opposite the attachment surface 11a. The axial channel 12, defined by at least one inner wall 121 of the supply body 10, communicates with a transverse opening 13 formed in the inner wall 121. Fluid enters the device 10 on the attachment surface 11b side of the supply body 11, passes through the axial channel 12, and then through the transverse opening 13.

[0050] The device 10 is provided with another elongated or rectangular component 15, referred to as a "pipe structure," which is connected to the supply body via a first end 15.1 and extends from the side of the supply body to a free end 15.2, which forms a fluid discharge end. Fluid is discharged through at least one fluid discharge port provided in the free end 15.2 of the pipe structure.

[0051] Device 10 features a one-piece design, meaning that the piping structure and the supply body are integrated into a single unit. Compared to nozzles that can be assembled from multiple components (typically the supply body and the fluid tube, with an outlet end cap added to the fluid tube), the one-piece design offers advantages in terms of size and functional repeatability.

[0052] Typically, device 10 is made of at least one plastic material or at least one polymer material, which makes the device economical, lightweight, and easy to produce in one step, for example, by molding. Polymers filled with glass fibers or reinforcing materials can also be used.

[0053] Preferably, the plastic material is selected to withstand thermal cycling between -40°C and 140°C. The plastic material can be, for example, polyamide (such as PA66 or PA6-6T), polyphthalamide (PPA), or polyphenylene sulfide (PPS).

[0054] Another criterion is the compatibility of the material with the fluid used. For example, when the fluid is cooling oil, a plastic material that is chemically resistant to that oil is selected.

[0055] A multi-material plastic device 10 may also be provided, which has, for example, a region made of a plastic material that is softer than another region made of a different plastic material.

[0056] For the one-piece plastic device 10, one or more brazing operations are also avoided in the case of producing a nozzle by assembling a supply body, fluid pipe and possibly discharge end cap according to the prior art.

[0057] Advantageously, a flexible plastic material can be used to achieve better durability of device 10. In this case, the material can be an unfilled glass fiber polymer.

[0058] In the example shown, the conduit structure 15 includes a passage 16 that communicates with a lateral opening 13 and leads to a plurality of fluid discharge ports 17a, 17b. After the fluid passes through the supply body 11 and the lateral opening 13, the fluid passes through the passage and then discharges from the device 10 through ports 17a, 17b.

[0059] according to Figure 2A In one possible embodiment shown, the pipe structure may be provided with a straight passage 16 extending in the direction Y1Y2 such that the angle α is not equal to 90°, for example, greater than 90° relative to the main axis X1X2 of the passage 12. In this specific example, the axis X1X2 is perpendicular to the attachment surface 11b.

[0060] Advantageously, ports 17a and 17b have different orientations relative to each other and with respect to passage 16. This allows fluid to be discharged to different targets. For example, in the case of a coolant nozzle, this allows for the cooling of different areas of the piston mechanism. For instance, a piston cooling nozzle can be designed to perform two functions: cooling the piston through the piston passage and lubricating the piston / connecting rod shaft.

[0061] Furthermore, the use of plastic materials to manufacture the device 10 makes it easy to achieve different configurations and shapes of the discharge ports 17a, 17b and / or passages 16.

[0062] Attachment components ( Figures 2A to 2B The attachment member (not shown) is intended to be inserted into the axial channel 12. This attachment member (e.g., formed by a hollow screw or valve screw) is typically configured to attach the supply body 11 to the fluid supply device (not shown) while simultaneously allowing fluid to flow from the axial channel 12 to the lateral opening 13. Specifically, the attachment member may be arranged such that the attachment surface 11b of the device 10 remains against the fluid supply device (not shown) or a support (the support itself being arranged against the fluid supply device).

[0063] exist Figure 3 In the specific embodiment shown, the attachment member is a hollow screw 20, which includes a head 21 arranged to abut against and in contact with the support surface 11b of the device 10 in this example. The screw 20 includes a hollow threaded shank 22 extending from the head 21, and the hollow threaded shank is received within an axial channel 12. The hollow shank 22 includes a portion 22.1 projecting from the attachment surface 11b. For example, this portion 22.1 may be intended to engage a hole in a fluid supply device (e.g., a pipe or oil pan in an engine block). This portion 22.1 is optional.

[0064] To allow fluid passage, at least one axial cavity 24a extending in the rod 22 leads to a fluid supply device at one end. The rod 22 of the screw 20 includes a radial cavity 24b extending from the axial cavity 24a, which communicates with the lateral opening 13 of the device 10.

[0065] exist Figure 3 In the specific exemplary embodiment shown, a valve screw 20 is advantageously used, which also provides the function of regulating the flow of fluid into the conduit structure 15 of the device 10. Here, a pressure-sensitive shut-off valve 25 is disposed in the hollow portion of the screw 20, and the pressure-sensitive shut-off valve is configured to alternately block fluid from entering the conduit structure 15 of the device 10 and allow fluid to enter the conduit structure 15 of the device 10 according to fluid pressure.

[0066] exist Figure 3In the specific example shown, the valve disc 25 may be formed by at least one closing element 25.1, for example, the closing element being in the form of a ball capable of closing a portion of the axial cavity 22a. The closing element 25.1 is arranged to abut against a spring 25.2 supported on a cover 25.3, and the closing element is configured to close another portion of the axial cavity 22a and block the fluid passage to the lateral opening 13 of the device 10 (particularly as long as the fluid pressure is below a given pressure threshold). Other types of valve disc screws may also be used, such as valve disc screws comprising a piston as a closing element.

[0067] Therefore, the nozzle can be operated as follows: under a certain fluid pressure, for example when the engine oil pressure exceeds a given threshold, the displacement of ball 25.1 causes the valve to move to the open position. Fluid is discharged through radial cavity 24b (which itself is connected to the lateral opening 13 of device 10) to the main passage 16 of device 10, and finally discharged through outlet ports 17a, 17b located at the free end 15.2 of pipe structure 15.

[0068] although Figure 3 The closed position of the valve disc that prevents fluid from flowing in the piping structure 15 is shown, and the fluid path used when the valve disc is in the open position is still schematically shown by arrow F1 in the figure.

[0069] As Figure 3 An alternative to the example shown could be a nozzle with a hollow, screw-type attachment (through which the fluid is intended to pass) without the need for an integrated closure element or valve. In this case, control of the fluid inlet in the piping structure 15 could be deflected outside of device 10 via another structure (e.g., a solenoid valve outside the screw and outside of device 10). Alternatively, for some applications, a nozzle without a closure capable of preventing fluid from flowing from the fluid supply device into the piping structure 15 could be provided.

[0070] To improve the attachment of the device 10 made of plastic material via an attachment member that is at least partially made of metal, a metal insert 30 (e.g., made of steel) can be provided in the channel 12 against the inner wall 12.1, and the metal insert is arranged between the inner wall 12.1 and the attachment member. The insert 30 also ensures that the screw head is centered and that the nozzle is correctly positioned.

[0071] exist Figures 4A to 4BThe diagram shows a three-dimensional view and a bottom view of the device 10 without attachment members, revealing a metal insert 30 housed within the axial channel 12. In this example, the insert has the appearance of a cylindrical tube. To allow fluid to pass through the passage 16, the metal insert 30 housed in the axial channel includes a side hole 32 that passes through the wall of the metal insert and communicates with the transverse opening 13. To ensure the correct orientation of the insert side hole 32 with the transverse opening 13 leading to the passage 16, a positioning structure can be provided on the insert 30. This positioning structure can be arranged on a positioning element of the inner wall 121 of the supply body 11. In the example shown, this positioning structure is a flat portion 31 arranged to abut against a corresponding flat portion 121a or a corresponding planar region 121a of the inner wall 121 of the supply body 11. This flat portion is a simple way to ensure the orientation of the hole 32 relative to the transverse opening 13, and thus ensures complete communication between the hole 32 and the transverse opening 13, thereby ensuring that fluid passes through an area with a controlled diameter. Alternatively, other devices (such as grooves or hexagonal cross sections along axes parallel to axes X1X2) can be provided to prevent rotation.

[0072] Insert 30 (in) Figure 4C (It can be seen separately) is usually pressed into the channel 12 that fits into the plastic body 11.

[0073] exist Figure 5 and Figures 6A to 6B Another example of an embodiment that can improve the attachment of device 10 is shown.

[0074] To limit the contact pressure applied by the attachment members to the fluid supply device to which the device 10 is attached, a rigid, perforated attachment plate 50 may be provided abutting against the attachment surface 10b of the supply body 11. This attachment plate 50 is made of a material with higher rigidity than the constituent material of the device 10. Typically, the attachment plate 50 is made of metal (e.g., steel).

[0075] In this configuration, the attachment member (particularly a screw or valve screw 20) passing through the hole 51 in the plate 50 may be provided with a shoulder 223, which is configured to abut against the attachment plate 50. Thus, the fastening force is applied to the plate 50, rather than to the fluid supply device or the engine block.

[0076] Rigid plate 50 may also be added to plastic device 10 to ensure nozzle interchangeability and to enable nozzle to be attached to metal bracket of fluid supply device.

[0077] For example, this plate 50 allows the plastic device 10 to be assembled onto an engine block made of a ductile material (such as aluminum alloy), on which metal nozzles are typically mounted. Excessive contact pressure on an engine block made of such material when tightening screws can cause plastic deformation of the portion of the engine block in contact with the screw, which is to be avoided. The plate 50 added 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, thereby reducing contact pressure and ultimately preventing deformation of the engine block when assembling the nozzle in the engine.

[0078] In addition to the openings that serve as channels for attachment members, the plate 50 may be provided with at least one hole or at least one protruding element (such as a pin) to make the assembly with the supply body 11 more robust, and the supply body is provided with a corresponding pin or corresponding hole.

[0079] The plate 50 may also be provided with at least one hole or at least one protruding element (such as a pin) to enable the nozzle to be properly oriented relative to the fluid supply device or the engine block.

[0080] In addition, such as Figure 5 and Figure 6A As shown, to improve the assembly, a seal 60 may be provided between the head 21 of the screw 20 and the support surface 11a of the body 11. The seal may be, for example, in the form of a flat, perforated disc. The seal 60 may be, for example, a fluorocarbon elastomer.

[0081] When the nozzle is subjected to high thermal stress, the seal 60 can also compensate for the expansion difference between the plastic body 11 and the screw 20, which is typically made of metal. This ensures the proper positioning of the attachment element, which also performs the function of a fluid passage. The seal 60 can also be used to ensure a seal. In particular, the seal 60 added below the head of the screw 20 ensures a seal is maintained over the entire temperature range of the nozzle in use.

[0082] exist Figure 5 and Figure 6A In the specific embodiment shown, the component is provided with an attachment plate 50 but without an insert, which reduces the cost of the nozzle. Figure 6B A view of the individual plate 50 is shown.

[0083] As an alternative, especially to ensure a certain degree of stability, an assembly with both the aforementioned attachment plate 50 and metal insert 30 can be manufactured.

[0084] According to another alternative, the component can be made without the attachment plate 50, but with... Figure 6A The screw shown includes shoulder 223.

[0085] The use of plastic material to manufacture the aforementioned pipe structure, and the provision of at least one discharge port 17a for discharging fluid from the nozzle, also makes it easier to achieve different port shapes. Figures 7A to 7E ).

[0086] Apart from Figure 7A In addition to the port with a circular cross-section 175 shown, ports with polygonal cross-sections or multiple curved surfaces can also be provided. This cross-section affects the desired jet quality and velocity at the nozzle exit. The cross-section can also be adjusted based on the amount of fluid to be sprayed onto a target area (also known as the useful flow rate) within a given time, such as a piston to be cooled.

[0087] exist Figure 7B In the example shown, the cross-section 171 of port 17a is formed by a series of curved portions (e.g., circles), forming a closed profile. Figure 7C In the middle, port 17a has a polygonal (especially hexagonal) cross-section 172, while triangles 173 or rectangles 174 (especially square cross-sections) are respectively set in Figure 7D and Figure 7E The shape of the region used to generate an accelerated fluid jet can be set on the discharge port 17a shown.

[0088] An example method for manufacturing a fluid nozzle according to the present invention will now be described.

[0089] In the first step, Figures 2A to 2B The device 10 shown is formed by molding (e.g., of a plastic or polymer material). The supply body and piping structure are made from a single workpiece and in a single operation. In particular, injection molding can be implemented.

[0090] At least one thermoformable polymer-based material can be used, such as PA66, PA6-6T, PPA, or PPS. This material is first softened by heating, then injected into a mold and cooled. For example, materials such as... Figure 8 The mold shown is 180.

[0091] In order to form the fluid discharge ports 17a, 17b, the lateral opening 13, and the passage 16 of device 10 in a single operation, the mold may be specifically provided with shafts 181a, 181b whose shapes are complementary to those of the fluid discharge ports 17a, 17b, and with rods 182 whose shapes are complementary to those of the passage 16, these shafts and rods penetrating into the material to be constructed. Typically, the channel 12 is formed in the same operation.

[0092] Advantageously, nozzle parts can be manufactured by molding a variety of polymer or plastic materials.

[0093] like Figure 6A and Figure 6B As shown, when the nozzle 10 is provided with the attachment plate 50, the device 10 can be molded onto the plate 50 during the molding operation. Therefore, a secure assembly can be achieved between the plastic device 10 and the attachment plate made of a different material (e.g., steel).

[0094] Once device 10 has been formed, in the setting as follows Figures 4A to 4B In the case of the insert 60 shown, the insert is pressed into the channel 12 of the supply body.

[0095] The nozzle is then assembled to the fluid supply device by introducing an attachment member (typically a hollow screw or valve screw) into channel 12.

[0096] As previously mentioned, in particular, the device 10 made of plastic material and the various components described above are designed to form an engine cooling device to spray cooling fluid (such as oil) onto one or more target areas of the engine's piston mechanism.

[0097] This device and this component can also be applied to other types of devices, such as hydraulic or pneumatic devices for automobiles, especially hydraulic circuits for internal combustion engines, or, for example, cooling nozzles for spraying lubricating oil onto chains or for electric motors in electric vehicles.

Claims

1. A fluid nozzle element having a supply body (11) including an attachment surface (11b), a support surface (11a) opposite to the attachment surface, and an axial channel (12) between the attachment surface and the support surface, the axial channel (12) communicating with a lateral opening (13) disposed in the supply body, the fluid nozzle element further including a conduit structure (15) communicating with the lateral opening (13), the conduit structure being connected to the supply body via a first end, the conduit structure extending laterally relative to the supply body, and the conduit structure including a free end (15.2) forming a discharge end, the discharge end being provided with one or more fluid discharge ports (17a, 17b) for discharging fluid. The supply body and the pipeline structure are formed from blocks of plastic or polymer materials. The fluid nozzle element further includes: An attachment plate (50), made of a metal material and / or a material more rigid than the plastic material, is assembled to the attachment surface (11b) of the supply body (11).

2. The fluid nozzle element according to claim 1, further comprising: A metal insert (30) is accommodated in the axial channel (12), the metal insert including an outer surface that presses against the inner wall (121) of the supply body, and the metal insert having a side hole (32) that passes through and communicates with the transverse opening (13).

3. The fluid nozzle element according to claim 2, wherein, The metal insert (30) is provided with a positioning structure (31) which is configured to be placed on the positioning element of the supply body.

4. The fluid nozzle element according to claim 1, wherein, The pipe structure (15) includes a fluid passage (16) having one end communicating with the transverse opening (13) and another end communicating with a plurality of fluid discharge ports (17a, 17b) having different orientations.

5. The fluid nozzle element according to claim 1, wherein, One or more of the fluid discharge ports (17a, 17b) have a polygonal cross-section, or a cross-section in the form of a series of curved portions forming a closed profile.

6. A fluid nozzle assembly, the fluid nozzle assembly comprising: - The fluid nozzle element according to claim 1 - At least one attachment member (20) for attaching the supply body (11) of the fluid nozzle element to the fluid supply device.

7. A fluid nozzle, the fluid nozzle comprising: - The fluid nozzle element according to claim 1 - A regulating element (25) for regulating the flow of fluid into the pipe structure (15).

8. A fluid nozzle, the fluid nozzle comprising: - The fluid nozzle element according to claim 1 - Valve disc screw (20), which is received in the axial channel (12).

9. The fluid nozzle according to claim 8, wherein the valve screw (20) is provided with a shoulder (223) configured to abut against an attachment plate (50) made of a metallic material and / or a material more rigid than the plastic material, the attachment plate (50) being assembled to the attachment surface (11b) of the supply body (11).

10. The fluid nozzle according to claim 8, further comprising: A seal (60) is inserted between the head (21) of the valve disc screw (20) and the support surface (11a) of the supply body (11).

11. A piston cooling device for an internal combustion engine, the piston cooling device comprising a fluid nozzle according to claim 8.

12. An internal combustion engine, the internal combustion engine comprising: - Engine block and piston slidably mounted in said engine block, - The piston cooling device according to claim 11.

13. A method for manufacturing a fluid nozzle element according to claim 1, the method comprising the step of molding a block of the plastic material.

14. The method according to claim 13, wherein, The molding is performed by overmolding the block of the plastic material onto the attachment plate (50) that is in contact with the attachment surface.

15. The method according to claim 13, wherein, The pipe structure includes a passage (16) and a fluid discharge port (17a, 17b), which are formed simultaneously during molding using a molding device including a mold (180), a rod (182) and one or more shafts (181a, 181b).

Images