An engine gearbox lubrication device and its assembly method

Abstract

This application discloses an engine gearbox lubrication device and its assembly method, belonging to the technical field of aero-engine components. The engine gearbox lubrication device includes a first nozzle and a second nozzle: the oil guide channel of the second nozzle is used to connect the first oil passage and the second oil passage, and the side wall of the oil guide channel is provided with a lubricating oil nozzle for spraying lubricating oil onto the gear; the first nozzle is located at the outlet end of the second oil passage, and an oil groove is provided in the casing body to connect the second oil passage and the sealing cavity with the gear cavity; the first nozzle is used to spray the lubricating oil from the second oil passage to the sealing cavity to lubricate the dynamic seals and bearings. By connecting the first oil passage of the casing cover and the second oil passage of the casing body through the second nozzle, and by setting the first nozzle at the outlet end of the second oil passage, multiple spray paths of lubricating oil can be achieved to meet the lubrication needs of different parts, and the overall structure is greatly simplified.

Description

Technical Field

[0001] This application relates to the field of aero-engine component technology, and in particular, to an engine gearbox lubrication device. Furthermore, this application also relates to an assembly method including the aforementioned engine gearbox lubrication device. Background Technology

[0002] The information provided in this section is for the purpose of generally presenting the background of this application. To the extent described in this section, the work of the currently named inventors and aspects of the description that may not constitute prior art at the time of filing are neither explicitly nor implicitly considered to be prior art of this application.

[0003] The accessory drive gearbox is one of the core components of aero-turboshaft engines. To improve the power-to-weight ratio of aero-turboshaft engines, various high technologies are widely used in aero-engines. The accessory drive gearbox tends to be integrated into a single design with a compact structure. The engine's fuel and lubricating oil lines are integrated and cast into the transmission housing as much as possible. However, the nozzles that spray oil to lubricate rotating parts such as gears and bearings are required to be set in the complex and intertwined internal oil lines of the transmission housing to ensure that the accessory drive gearbox can operate normally and efficiently. This brings problems such as limited space, numerous oil line connections, easy assembly errors and reverse installations, and complex processes.

[0004] Existing aircraft engine accessory transmission gearboxes mostly use nozzles with lugs and mounting screws for lubricating and cooling rotating components such as gears and bearings. This requires a large structural space. In areas with limited space, oil injection holes are machined directly at the end of the oil passage inside the aluminum alloy casing. This places high demands on casing machining and can easily lead to the entire casing being scrapped due to nozzle dimensional errors. Furthermore, it results in poor maintainability in later use. The internal oil passages connecting the casings also employ specialized pipe fittings and O-rings, resulting in a large number of parts.

[0005] Currently, the lubrication system for aero-engine accessory transmission gearboxes suffers from the following problems: It employs relatively complex nozzles, requiring significant installation space, which is insufficient in space-constrained locations such as the narrow space between bearings and dynamic seals; it uses specialized pipe fittings and O-rings to connect the internal oil passages between casings, resulting in a large number of parts and a high risk of incorrect installation; and it directly machines oil injection holes at the end of the oil passages inside the aluminum alloy casing, which can easily lead to the entire casing being scrapped due to nozzle dimensional errors, and subsequent repairs are troublesome if nozzle blockage occurs, resulting in poor manufacturability and maintainability. Therefore, it is necessary to improve the overall structural layout and key components of the lubrication system to meet different lubrication needs and facilitate assembly, disassembly, and maintenance to improve work efficiency. Summary of the Invention

[0006] In view of at least one of the above technical problems, this application provides an engine gearbox lubrication device that can connect the first oil passage of the casing cover and the second oil passage of the casing body through a second nozzle, and by setting the first nozzle at the outlet end of the second oil passage, multiple injection routes of lubricating oil can be realized to meet the lubrication needs of different parts, and the overall structure is greatly simplified.

[0007] This application also provides an assembly method including the above-mentioned engine gearbox lubrication device.

[0008] According to one aspect of this application, an engine gearbox lubrication device is provided, including a gearbox body and a gearbox cover. The gearbox body has a gear cavity and a sealing cavity. The gear cavity is used to install gears and bearings. The sealing cavity is located at the mating surface between the gear and the gearbox body and is used to install dynamic seals. The gearbox body and the gearbox cover are connected. A first oil passage is provided in the gearbox cover, and a second oil passage is provided in the gearbox body. The second oil passage communicates with the sealing cavity. The first oil passage is used to connect to an external lubricating oil supply pipe. The engine gearbox lubrication device further includes a first nozzle and a second nozzle.

[0009] The first end of the second nozzle is connected to the casing cover, and the second end of the second nozzle is connected to the casing body. An oil guide channel is provided inside the second nozzle. The oil guide channel is used to connect the first oil passage and the second oil passage. An oil spray nozzle is provided on the side wall of the oil guide channel. The oil spray nozzle is used to spray oil into the gear in the gear cavity.

[0010] The first nozzle is located at the outlet end of the second oil passage. An oil groove is provided inside the casing. The oil groove is located between the sealing cavity and the gear cavity. The oil groove is used to connect the sealing cavity and the gear cavity. The first nozzle is used to spray the lubricating oil from the second oil passage to the sealing cavity to lubricate the dynamic seal and bearing.

[0011] In some embodiments of this application, the inlet end of the first nozzle is provided with a first oil injection hole, the outlet end of the first nozzle is provided with a second oil injection hole, the first oil injection hole and the second oil injection hole are connected, and the outlet end of the second oil injection hole is provided with an installation groove.

[0012] In some embodiments of this application, the diameter of the first injection hole is φ0.45-0.6mm, the length-to-diameter ratio of the first injection hole is 6:1 to 12:1, and the diameter of the second injection hole is larger than the diameter of the first injection hole.

[0013] In some embodiments of this application, the diameter of the second injection hole is three times the diameter of the first injection hole.

[0014] In some embodiments of this application, the bottom surface of the second injection hole is chamfered at the outlet end of the first injection hole.

[0015] In some embodiments of this application, the diameter of the oil guide channel of the second nozzle is φ6 to 6.2 mm, the diameter of the lubricating oil nozzle is 0.08 to 0.1 times that of the oil guide channel, and the length-to-diameter ratio of the lubricating oil nozzle is 6:1 to 12:1.

[0016] In some embodiments of this application, the sidewall of the second nozzle is provided with a boss at the outlet end of the lubricating oil nozzle. The boss is used to extend the length of the lubricating oil nozzle to adjust the length-to-diameter ratio of the lubricating oil nozzle.

[0017] In some embodiments of this application, the sidewall of the second nozzle is provided with an installation platform, and the installation platform is provided with an installation limiting hole. The engine gearbox lubrication device also includes a fastener, which is used to pass through the installation limiting hole and cooperate with the preset installation screw hole on the casing to lock and limit the installation platform to the casing.

[0018] According to another aspect of this application, a method for assembling an engine gearbox lubrication device is also provided, for assembling the aforementioned engine gearbox lubrication device, the method comprising the following steps:

[0019] S100: After degreasing the first nozzle, air dry it at room temperature;

[0020] S200: The outer wall of the first nozzle is provided with external threads. Spray an activator on the surface of the external threads, and then apply thread sealant continuously and evenly to the first 2 to 3 turns of the external threads with a glue stick. Apply adhesive to the threaded hole at the outlet end of the second oil passage of the casing. Screw the first nozzle into the threaded hole at the outlet end of the second oil passage, and screw it in and out 2 to 3 times.

[0021] S300: Heat the casing to 90℃~100℃ in an insulated box and cure it for 50~60 minutes;

[0022] S400: A second nozzle is used to connect the first oil passage of the casing cover with the second oil passage of the casing body.

[0023] In some embodiments of this application, the method further includes the following after step S400:

[0024] S500: Assembly verification. When the lubricating oil temperature connected to the first oil passage is 55-65℃ and the lubricating oil pressure is 0.49-0.51MPa, the length-to-diameter ratio of the lubricating oil nozzle is adjusted by cutting the thickness of the boss at the outlet end of the lubricating oil nozzle, or by grinding the orifice diameter of the lubricating oil nozzle to adjust the length-to-diameter ratio of the lubricating oil nozzle, so that the flow rate of the lubricating oil nozzle reaches 0.31-0.34L / min.

[0025] This application has the following beneficial effects:

[0026] This application discloses an engine gearbox lubrication device capable of lubricating rotating components such as gears, bearings, and dynamic seals within the gearbox housing. The gears are rotatably mounted within the gear cavity of the housing via bearings, while the dynamic seals are movably positioned at the mating surface between the gear shaft and the housing. A first oil passage is provided within the housing cover, and a second oil passage is provided within the housing. The first oil passage is externally connected to lubricating oil. This application connects the first and second oil passages via a second nozzle, allowing lubricating oil to enter the second oil passage and be sprayed onto the dynamic seals through the first nozzle at the outlet of the second oil passage. Since the dynamic seals are close to the gear bearings, the lubricating oil provides spray lubrication to the friction pair in the narrow space between the dynamic seals and the bearings. The lubricating oil can also flow back into the gear cavity through an oil groove. Simultaneously, an oil nozzle is provided on the side wall of the oil guide channel within the second nozzle, allowing lubricating oil to be sprayed onto the gears within the gear cavity. Therefore, this application can achieve multiple flow paths for lubricating oil through structural optimization to lubricate different components inside the gearbox. It meets the lubrication needs of multiple parts of the gearbox in a very small space with complex internal oil passages. The nozzle and pipe fitting are integrated into one unit, eliminating the need for special pipe fittings and sealing rings to connect the internal oil passages between the various casings, thereby significantly reducing the number of parts, lowering manufacturing and maintenance costs, ensuring that the gearbox structure is compact, lightweight, simple in process, highly targeted in oil injection, and has a good lubrication effect. At the same time, it also improves the maintainability and economy of the engine. In particular, the nozzle is built into the oil passage inside the casing and can be well protected. With the cooling effect of lubricating oil on the nozzle, it has a better fireproof effect and can effectively solve the problem of poor fireproof performance and high-temperature burning resistance of external nozzles.

[0027] The assembly method of the engine gearbox lubrication device in this application also has the aforementioned beneficial effects. It further includes screwing the first nozzle into the outlet end of the second oil passage, eliminating the need for lugs and screws for fastening. This ensures the first nozzle is directly aligned with the friction pair mating surface in the confined space between the bearing and the dynamic seal, resulting in a compact installation structure and high lubrication and cooling efficiency. Simultaneously, by applying adhesive and curing treatment to the first nozzle, a simple and reliable adhesive curing process is implemented to prevent the screw-in nozzle from falling off. This, combined with the second nozzle, connects the first oil passage of the casing cover to the second oil passage of the casing body, forming an integrated oil passage structure with the casing. This simplifies assembly and creates a compact structure. In particular, this application employs an innovative process where thread sealant is applied only to the first 2-3 turns of the external thread 13 of the first nozzle 1. By screwing the first nozzle 1 into the threaded hole at the outlet end of the second oil passage 25 2-3 times, air is effectively expelled from the threaded hole, and the thread sealant is evenly spread across the entire surface of the external thread 13 without becoming excessively thick or thin, thus improving the sealing effect of the first nozzle 1. This application employs multiple measures to effectively improve the overall assembly efficiency and stability of the lubrication device, effectively meeting the structural and functional requirements of the engine for long-term operation.

[0028] Of course, any product implementing this application does not necessarily need to achieve all the advantages described above simultaneously. In addition to the purposes, features, and advantages described above, this application also has other purposes, features, and advantages. The following will provide a more detailed description of this application with reference to figures. Attached Figure Description

[0029] The accompanying drawings, which form part of this application, are used to provide a further understanding of this application. The illustrative embodiments and descriptions of this application are used to explain this application and do not constitute an undue limitation of this application. In the drawings:

[0030] Figure 1 This is a schematic diagram of the overall structure of a preferred embodiment of this application;

[0031] Figure 2 This is a schematic diagram of the structure of the first oil passage in a preferred embodiment of this application;

[0032] Figure 3 This is a schematic diagram of the internal structure of the first nozzle in a preferred embodiment of this application;

[0033] Figure 4 This is a schematic diagram of the mounting slot according to a preferred embodiment of this application;

[0034] Figure 5 This is a schematic diagram of the structure of the second nozzle in a preferred embodiment of this application.

[0035] Legend: 1. First nozzle; 2. Second nozzle; 3. Casing body; 4. First sealing ring; 5. Fastener; 6. Second sealing ring; 7. Casing cover; 8. Lubricating oil interface; 9. Gear; 10. Bearing; 11. Oil groove; 12. Dynamic seal; 13. External thread; 14. First oil injection hole; 15. Second oil injection hole; 16. Mounting groove; 17. Oil guide channel; 18. First sealing groove; 19. Mounting platform; 20. Mounting limit hole; 21. Second sealing groove; 22. Boss; 23. Lubricating oil nozzle; 24. First oil passage; 25. Second oil passage; 26. Buffer chamber. Detailed Implementation

[0036] The embodiments of this application are described in detail below with reference to the accompanying drawings; however, this application may be implemented in a variety of different ways as defined and covered below.

[0037] An engine gearbox lubrication device includes a housing 3 and a housing cover 7. The housing 3 has a gear cavity and a sealing cavity. The gear cavity is used to install a gear 9 and a bearing 10. The sealing cavity is located at the mating surface between the gear 9 and the housing 3 and is used to install a dynamic seal 12. The housing 3 is connected to the housing cover 7. A first oil passage 24 is opened in the housing cover 7, and a second oil passage 25 is opened in the housing 3. The second oil passage 25 communicates with the sealing cavity. The first oil passage 24 is used to connect an external lubricating oil supply pipe. The engine gearbox lubrication device also includes a first nozzle 1 and a second nozzle 2.

[0038] The first end of the second nozzle 2 is connected to the casing cover 7, and the second end of the second nozzle 2 is connected to the casing body 3. An oil guide channel 17 is provided inside the second nozzle 2. The oil guide channel 17 is used to connect the first oil passage 24 and the second oil passage 25. An oil spray nozzle 23 is provided on the side wall of the oil guide channel 17. The oil spray nozzle 23 is used to spray oil into the gear 9 in the gear cavity.

[0039] The first nozzle 1 is located at the outlet end of the second oil passage 25. An oil groove 11 is provided inside the casing 3. The oil groove 11 is located between the sealing cavity and the gear cavity. The oil groove 11 is used to connect the sealing cavity and the gear cavity. The first nozzle 1 is used to spray the lubricating oil of the second oil passage 25 to the sealing cavity to lubricate the dynamic seal 12 and the bearing 10.

[0040] Here, "first nozzle 1" refers to a structure located at the outlet end of the second oil passage 25 and spraying lubricating oil into the sealed cavity. In some embodiments, the first nozzle 1 is a cylindrical structure with an internal spray hole, and its outer wall is provided with external threads 13. The first nozzle 1 is threadedly connected to the second oil passage 25. The outlet end of the first nozzle 1 has a mounting groove 16, which is a slotted structure that allows for easy screw-in installation of the first nozzle 1 using conventional tools. In other embodiments, the first nozzle 1 and the second oil passage 25 are interference-fitted, or the mating surfaces of the first nozzle 1 and the second oil passage 25 are riveted.

[0041] In some embodiments, a buffer cavity 26 is provided on the side wall of the outlet end of the first oil passage 24. The bottom surface of the buffer cavity 26 is an arc-shaped structure. The buffer cavity 26 can increase the area of ​​the outlet end of the first oil passage 24, reduce the outlet pressure of the lubricating oil, and temporarily accommodate the lubricating oil to flow into the second nozzle 2. This can reduce the force of the lubricating oil impacting the end face of the second nozzle 2, reduce fluctuations, and improve the smoothness of the lubricating oil entering the second nozzle 2.

[0042] It should be noted that the inlet end of the first oil passage 24 is equipped with a lubricating oil interface 8, which is connected to the lubricating oil delivery pipe delivered by the engine lubricating oil system through the lubricating oil interface 8, so that lubricating oil can enter the first oil passage 24.

[0043] It should be noted that the gear 9 is connected to the housing 3 via a rotating shaft and bearing 10, and the dynamic seal 12 is located at the mating surface between the rotating shaft of the gear 9 and the housing 3, with a narrow space between the dynamic seal 12 and the bearing 10.

[0044] This application discloses an engine gearbox lubrication device capable of lubricating the rotating components, including gears 9, bearings 10, and dynamic seals 12, within the gearbox housing 3. The gears 9 are rotatably mounted in the gear cavity of the housing 3 via bearings 10, while the dynamic seals 12 are movably disposed at the mating surface between the shaft of the gears 9 and the housing 3. A first oil passage 24 is provided within the housing cover 7 on the housing 3, and a second oil passage 25 is provided within the housing 3. The first oil passage 24 is externally connected to lubricating oil. This application connects the first oil passage 24 and the second oil passage 25 through the second nozzle 2, allowing lubricating oil to enter the second oil passage 25 and be sprayed onto the dynamic seal 12 through the first nozzle 1 at the outlet end of the second oil passage 25. Since the dynamic seal 12 is close to the bearing 10 of the gear 9, the lubricating oil can provide spray lubrication for the friction pair in the narrow space between the dynamic seal 12 and the bearing 10. The lubricating oil can also flow back into the gear cavity through the oil groove 11. At the same time, the side wall of the oil guide channel 17 in the second nozzle 2 is provided with a lubricating oil nozzle 23, through which lubricating oil can be sprayed onto the gear 9 in the gear cavity for lubrication. Therefore, this application can achieve multiple flow paths for lubricating oil through structural optimization to lubricate different components within the gearbox. It meets the lubrication needs of multiple parts of the gearbox within a very small space of complex internal oil passages. By integrating the nozzle and pipe fittings into one unit, it eliminates the need for dedicated pipe fittings and O-rings to connect the internal oil passages between the various casings, thereby significantly reducing the number of parts, lowering manufacturing and maintenance costs, ensuring a compact gearbox structure, light weight, simple process, highly targeted oil injection, and good lubrication effect. It also improves engine maintainability and economy. In particular, the nozzles, built into the internal oil passages of the casing, are well protected. Combined with the cooling effect of the lubricating oil on the nozzles, it has a better fireproof effect, effectively solving the problem of poor fireproof performance and high-temperature burning resistance of external nozzles.

[0045] Preferably, please refer to Figure 1 , 3 As shown in Figure 4, the inlet end of the first nozzle 1 is provided with a first oil injection hole 14, the outlet end of the first nozzle 1 is provided with a second oil injection hole 15, the first oil injection hole 14 and the second oil injection hole 15 are connected, and the outlet end of the second oil injection hole 15 is provided with an installation groove 16.

[0046] It is understood that the first nozzle 1 has an oil spraying function by opening a first oil spray hole 14 and a second oil spray hole 15 that are interconnected in the first nozzle 1, and an installation groove 16 is opened at the outlet end of the second oil spray hole 15 to avoid affecting the length-to-diameter ratio of the first oil spray hole 14. A specific oil spraying rate and flow rate can be achieved through the first oil spray hole 14 to meet different lubrication needs.

[0047] Optionally, the mounting groove 16 is a slotted structure, which is convenient for processing and easy to use with conventional screwdrivers to tighten the first nozzle 1.

[0048] Preferably, please refer to Figure 1 , 3 As shown in Figure 4, the diameter of the first injection hole 14 is φ0.45-0.6mm, the length-to-diameter ratio of the first injection hole 14 is 6:1 to 12:1, and the diameter of the second injection hole 15 is larger than the diameter of the first injection hole 14.

[0049] It is understandable that lubricating oil sequentially enters the second injection hole 15 from the first injection hole 14, and achieves the final lubricating oil injection effect through the second injection hole 15. Therefore, setting the diameter of the second injection hole 15 to be larger than the diameter of the first injection hole 14 ensures that lubricating oil enters the second injection hole 15 stably and quickly from the first injection hole 14. By controlling the length-to-diameter ratio of the first injection hole 14 to 6:1 to 12:1, it is possible to avoid the lubricating oil injection rate being too high due to an excessively large length-to-diameter ratio, which could cause impact on the dynamic seal 12 or the inside of the casing 3. It is also possible to avoid the lubricating oil injection rate being too low due to an excessively small length-to-diameter ratio, which could result in insufficient flow to meet lubrication requirements. In particular, a mounting groove 16 with a slotted structure is provided at the outlet end of the second injection hole 15, which can widen the outlet end of the second injection hole 15, realize lubricating oil diffusion injection, and avoid the impact on components that are easily caused by concentrated lubricating oil injection. The mounting slot 16, in conjunction with a screwdriver, allows the first nozzle 1 to be screwed in. This reduces the impact on the outlet angle of the second oil injection hole 15 during installation and removal, thus avoiding affecting the angle of the lubricating oil injection from the second oil injection hole 15 and ensuring the stability of the first nozzle 1 in use.

[0050] The aspect ratio is the ratio of the length of the hole to the diameter of the hole.

[0051] Preferably, please refer to Figure 3 As shown, the diameter of the second injection hole 15 is three times the diameter of the first injection hole 14.

[0052] It is understandable that since the lubricating oil first enters the first injection hole 14 and then the second injection hole 15, and the final lubricating oil spraying effect is achieved through the second injection hole 15, setting the diameter of the second injection hole 15 to be larger than the diameter of the first injection hole 14 can make the lubricating oil enter the first injection hole 14 under greater pressure, thus achieving a rapid oil delivery effect. After determining the range of the length-to-diameter ratio of the first injection hole 14, setting the diameter of the second injection hole 15 to three times the diameter of the first injection hole 14 can ensure that the first injection hole 14 continuously and stably delivers lubricating oil to the second injection hole 15, while ensuring that the pressure change of the lubricating oil is not too large or too small, avoiding fluctuations or insufficient flow rate when the lubricating oil enters the second injection hole 15, and ensuring that the second injection hole 15 can continuously and stably spray lubricating oil for lubrication.

[0053] Preferably, please refer to Figure 3 As shown, the bottom surface of the second injection hole 15 is chamfered at the outlet end of the first injection hole 14.

[0054] Understandably, in order to ensure that the lubricating oil smoothly transitions from the first injection hole 14 into the second injection hole 15, a chamfer is provided on the bottom surface of the second injection hole 15 at the outlet end of the first injection hole 14, which makes the outlet end of the first injection hole 14 open, thereby improving the stability of the lubricating oil entering the second injection hole 15 and reducing phenomena such as lubricating oil fluctuation.

[0055] Optionally, the bottom surface of the second oil injection hole 15 is provided with a chamfer of 120° at the outlet end of the first oil injection hole 14 to achieve a larger tilt angle, making the transition section smoother and facilitating a more stable flow of lubricating oil. In particular, the chamfer can also work in conjunction with the pre-set chamfered surface at the front end of the drill bit to effectively improve the machinability, facilitate rapid forming, and improve processing efficiency.

[0056] Preferably, please refer to Figure 1 , 2 As shown in Figure 5, the diameter of the oil guide channel 17 of the second nozzle 2 is φ6~6.2mm, the diameter of the lubricating oil nozzle 23 is 0.08~0.1 times that of the oil guide channel 17, and the length-to-diameter ratio of the lubricating oil nozzle 23 is 6:1~12:1.

[0057] Understandably, the diameter of the oil nozzle 23 is much smaller than the diameter of the oil guide channel 17, thus achieving the effect of oil injection from the side wall of the second nozzle 2. After determining the diameter of the oil guide channel 17 and the length-to-diameter ratio of the oil nozzle 23, the injection rate and flow rate of the oil nozzle 23 can be determined to ensure that the oil injected by the oil nozzle 23 can be continuously and stably injected to the gear 9 to provide lubrication. The diameter of the oil nozzle 23 is 0.08 to 0.1 times that of the oil guide channel 17, and the length-to-diameter ratio of the oil nozzle 23 is 6:1 to 12:1. This avoids the oil injection rate being too high due to an excessively large length-to-diameter ratio of the oil nozzle 23, which could cause impact on the gear 9 or the inside of the casing 3. It also avoids the oil injection rate being too low due to an excessively small length-to-diameter ratio of the oil nozzle 23, which could result in insufficient flow rate to meet lubrication requirements.

[0058] When the lubricating oil temperature is 55–65℃ and the lubricating oil pressure is 0.49–0.51 MPa, the relationship between the length-to-diameter ratio S of the lubricating oil nozzle 23 and the distance l from the outlet of the lubricating oil nozzle 23 to the axis of the gear 9 is as follows:

[0059] 1

[0060] In the formula, S is the length-to-diameter ratio of the oil nozzle 23, l is the distance from the outlet of the oil nozzle 23 to the axis of the gear 9, D is the diameter of the oil nozzle 23, and A is a constant. In some embodiments, A ranges from 3 to 6.

[0061] Preferably, please refer to Figure 5 As shown, the sidewall of the second nozzle 2 is provided with a boss 22 at the outlet end of the lubricating oil nozzle 23. The boss 22 is used to extend the length of the lubricating oil nozzle 23 to adjust the length-to-diameter ratio of the lubricating oil nozzle 23.

[0062] It is understandable that the boss portion 22 is a raised platform structure, and the tail end of the oil nozzle 23 is set through the boss portion 22. Therefore, the overall length of the oil nozzle 23 can be changed by changing the thickness of the boss portion 22. Since the diameter of the oil nozzle 23 is already determined, the length-to-diameter ratio of the oil nozzle 23 can be adjusted by changing the thickness of the boss portion 22 so that the oil injection rate and flow rate of the oil nozzle 23 meet the preset requirements.

[0063] Preferably, please refer to Figure 1 As shown, the side wall of the second nozzle 2 is provided with an installation platform 19, and the installation platform 19 is provided with an installation limiting hole 20. The engine gearbox lubrication device also includes a fastener 5, which is used to pass through the installation limiting hole 20 and cooperate with the preset installation screw hole on the casing 3 to lock and limit the installation platform 19 and the casing 3.

[0064] Understandably, by locking the mounting platform 19 to the casing 3 with fastener 5, the second nozzle 2 can be quickly and easily fixed and installed. The overall installation operation is very simple and efficient, and it is also convenient for the subsequent disassembly of the second nozzle 2. Optionally, the fastener 5 can be a bolt or stud, which is convenient for disassembly and assembly using conventional tools, thus improving the efficiency of disassembly and assembly of the second nozzle 2.

[0065] Optionally, a first sealing groove 18 and a second sealing groove 21 are respectively provided at opposite ends of the second nozzle 2. The first sealing groove 18 is used to provide a first sealing ring 4 to enhance the sealing of the mating surface between the second nozzle 2 and the casing 3. The second sealing groove 21 is used to provide a second sealing ring 6 to enhance the sealing of the mating surface between the second nozzle 2 and the casing cover 7.

[0066] According to another aspect of this application, a method for assembling an engine gearbox lubrication device is also provided, for assembling the aforementioned engine gearbox lubrication device, the method comprising the following steps:

[0067] S100: After degreasing the first nozzle 1, let it air dry at room temperature;

[0068] S200: The outer wall of the first nozzle 1 is provided with an external thread 13. An activator is sprayed on the surface of the external thread 13. Then, the thread sealant is continuously and evenly applied to the first 2 to 3 turns of the external thread 13 with a glue mixing stick. Adhesive is applied to the threaded hole at the outlet end of the second oil passage 25 of the casing 3. The first nozzle 1 is screwed into the threaded hole at the outlet end of the second oil passage 25 and screwed in and out 2 to 3 times.

[0069] S300: Heat the casing 3 in an insulated box to 90℃~100℃ and cure it for 50~60 minutes;

[0070] S400: The first oil passage 24 of the casing cover 7 is connected to the second oil passage 25 of the casing body 3 by the second nozzle 2.

[0071] The assembly method of the engine gearbox lubrication device in this application also has the aforementioned beneficial effects. It further includes screwing the first nozzle 1 into the outlet end of the second oil passage 25, eliminating the need for lugs and screws for fastening. This ensures that the first nozzle 1 is directly aligned with the friction pair mating surface of the bearing 10 and the dynamic seal 12 in a confined space, resulting in a compact installation structure and high lubrication and cooling efficiency. Simultaneously, by applying adhesive and curing treatment to the first nozzle 1, a simple and reliable adhesive curing process is achieved to prevent the screw-in nozzle from falling off. This, combined with the second nozzle 2, connects the first oil passage 24 of the casing cover 7 to the second oil passage 25 of the casing body 3, forming an integrated oil passage structure with the casing. This simplifies assembly and results in a compact structure. This application employs an innovative process, applying thread sealant only to the first 2-3 turns of the external thread 13 of the first nozzle 1. By screwing the first nozzle 1 into the threaded hole at the outlet end of the second oil passage 25 2-3 times, air is effectively expelled from the threaded hole, and the thread sealant is evenly spread across the entire surface of the external thread 13 without becoming excessively thick or thin. This improves the sealing effect of the first nozzle 1. These multiple measures effectively enhance the overall assembly efficiency and stability of the lubrication device, effectively meeting the structural and functional requirements of long-term engine operation.

[0072] Preferably, the process further includes the following after step S400:

[0073] S500: Assembly verification. When the lubricating oil temperature connected to the first oil passage 24 is 55-65℃ and the lubricating oil pressure is 0.49-0.51MPa, the length-to-diameter ratio of the lubricating oil nozzle 23 is adjusted by cutting the thickness of the boss portion 22 at the outlet end of the lubricating oil nozzle 23, or by grinding the orifice diameter of the lubricating oil nozzle 23, so that the flow rate of the lubricating oil nozzle 23 reaches 0.31-0.34L / min.

[0074] It is understandable that by adjusting the length-to-diameter ratio of the first oil injection hole 14 at the inlet end of the first nozzle 1, the flow rate of the lubricating oil injected by the first oil injection hole 14 can be changed. Specifically, the first nozzle 1 with a different length-to-diameter ratio can be replaced. Subsequently, by cutting the thickness of the boss portion 22 provided at the outlet end of the lubricating oil nozzle 23, or by grinding and adjusting the diameter of the lubricating oil nozzle 23, the length-to-diameter ratio of the lubricating oil nozzle 23 can be adjusted to change the flow rate of the lubricating oil injected by the lubricating oil nozzle 23. Ultimately, the flow rates of the first oil injection hole 14 and the lubricating oil nozzle 23 are changed to ensure that the flow rates of the first oil injection hole 14 and the lubricating oil nozzle 23 reach 0.31 to 0.34 L / min, so that the engine gearbox lubrication device meets the requirements.

[0075] In summary, this application provides a multifunctional engine gearbox lubrication device and its assembly method, which can meet the lubrication needs of multiple parts of the gearbox in a very small space with complex internal oil circuits, reduce the number of parts, reduce manufacturing and maintenance costs, ensure that the gearbox has a compact structure, light weight, simple process, strong oil injection targeting, and good lubrication effect, while also improving engine maintainability and economy.

[0076] It should be noted that, in this document, the terms “comprising,” “including,” or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0077] This document uses specific examples to illustrate the principles and implementation methods of this application. The examples are merely for the purpose of helping to understand the methods and core ideas of this application. The above descriptions are only preferred embodiments of this application. It should be noted that due to the limitations of written expression, and the existence of an infinite number of specific structures, those skilled in the art can make various improvements, modifications, or variations without departing from the principles of this application, and can also combine the above technical features in an appropriate manner. These improvements, modifications, variations, or combinations, or the direct application of the inventive concept and technical solution to other situations without modification, should all be considered as protected by this application.

Claims

1. A gearbox lubrication device for an engine, comprising a gearbox body (3) and a gearbox cover (7), wherein the gearbox body (3) has a gear cavity and a sealing cavity, the gear cavity being used to install a gear (9) and a bearing (10), the sealing cavity being located at the mating surface between the gear (9) and the gearbox body (3) and being used to install a dynamic seal (12), the gearbox body (3) being connected to the gearbox cover (7), a first oil passage (24) being provided in the gearbox cover (7), a second oil passage (25) being provided in the gearbox body (3), the second oil passage (25) being connected to the sealing cavity, and the first oil passage (24) being used to connect an external lubricating oil supply pipe, characterized in that, The engine gearbox lubrication device also includes a first nozzle (1) and a second nozzle (2): The first end of the second nozzle (2) is connected to the casing cover (7), and the second end of the second nozzle (2) is connected to the casing body (3). An oil guide channel (17) is provided inside the second nozzle (2). The oil guide channel (17) is used to connect the first oil passage (24) and the second oil passage (25). An oil spray nozzle (23) is provided on the side wall of the oil guide channel (17). The oil spray nozzle (23) is used to spray oil onto the gear (9) in the gear cavity. The first nozzle (1) is located at the outlet end of the second oil passage (25). An oil groove (11) is provided inside the casing (3). The oil groove (11) is located between the sealing cavity and the gear cavity. The oil groove (11) is used to connect the sealing cavity and the gear cavity. The first nozzle (1) is used to spray the lubricating oil from the second oil passage (25) to the sealing cavity to lubricate the dynamic seal (12) and the bearing (10).

2. The engine gearbox lubrication device according to claim 1, characterized in that, The first nozzle (1) has a first oil injection hole (14) at its inlet end and a second oil injection hole (15) at its outlet end. The first oil injection hole (14) and the second oil injection hole (15) are connected. The second oil injection hole (15) has an installation groove (16) at its outlet end.

3. The engine gearbox lubrication device according to claim 2, characterized in that, The diameter of the first injection hole (14) is φ0.45-0.6mm, the length-to-diameter ratio of the first injection hole (14) is 6:1 to 12:1, and the diameter of the second injection hole (15) is greater than the diameter of the first injection hole (14).

4. The engine gearbox lubrication device according to claim 3, characterized in that, The diameter of the second injection hole (15) is three times the diameter of the first injection hole (14).

5. The engine gearbox lubrication device according to claim 3, characterized in that, The bottom surface of the second oil injection hole (15) is chamfered at the outlet end of the first oil injection hole (14).

6. The engine gearbox lubrication device according to claim 1, characterized in that, The diameter of the oil guide channel (17) of the second nozzle (2) is φ6~6.2mm, the diameter of the lubricating oil nozzle (23) is 0.08~0.1 times that of the oil guide channel (17), and the length-to-diameter ratio of the lubricating oil nozzle (23) is 6:1~12:

1.

7. The engine gearbox lubrication device according to claim 6, characterized in that, The sidewall of the second nozzle (2) is provided with a boss (22) at the outlet end of the lubricating oil nozzle (23). The boss (22) is used to extend the length of the lubricating oil nozzle (23) to adjust the length-to-diameter ratio of the lubricating oil nozzle (23).

8. The engine gearbox lubrication device according to claim 1, characterized in that, The second nozzle (2) has a mounting platform (19) on its side wall. The mounting platform (19) has a mounting limit hole (20). The engine gearbox lubrication device also includes a fastener (5). The fastener (5) is used to pass through the mounting limit hole (20) and cooperate with the mounting screw hole on the casing (3) to lock the mounting platform (19) and the casing (3) in a limited position.

9. A method for assembling a lubrication device for an engine gearbox, characterized in that, For assembling the engine gearbox lubrication device as described in any one of claims 1-8, the assembly method of the engine gearbox lubrication device includes the following steps: S100: After degreasing the first nozzle (1), air dry it at room temperature; S200: The outer wall of the first nozzle (1) is provided with an external thread (13). Spray an activator on the surface of the external thread (13), and then apply the thread sealant continuously and evenly to the first 2 to 3 turns of the external thread (13) with a glue stick. Apply adhesive to the threaded hole at the outlet end of the second oil passage (25) of the casing (3). Screw the first nozzle (1) into the threaded hole at the outlet end of the second oil passage (25) and screw it in and out 2 to 3 times. S300: Heat the casing (3) in an insulated box to 90℃~100℃ and cure it for 50~60 minutes; S400: The first oil passage (24) of the casing cover (7) is connected to the second oil passage (25) of the casing body (3) by using the second nozzle (2).

10. The assembly method of an engine gearbox lubrication device according to claim 9, characterized in that, The process after step S400 also includes: S500: Assembly verification. When the lubricating oil temperature connected to the first oil passage (24) is 55-65℃ and the lubricating oil pressure is 0.49-0.51MPa, the length-to-diameter ratio of the lubricating oil nozzle (23) is adjusted by cutting the thickness of the boss (22) at the outlet end of the lubricating oil nozzle (23), or the length-to-diameter ratio of the lubricating oil nozzle (23) is adjusted by grinding the orifice diameter of the lubricating oil nozzle (23), so that the flow rate of the lubricating oil nozzle (23) reaches 0.31-0.34L / min.

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