Attachment gearbox lubricating structure and aero-engine transmission system

Abstract

The invention provides an accessory gear box lubricating structure and an aero-engine transmission system, the accessory gear box lubricating structure comprises a gear shaft, an inner spline shaft, an outer spline shaft, an oil distribution sleeve and an oil nozzle, and a first inner spline and a first cavity located on one side of the first inner spline are arranged in the gear shaft. The inner spline shaft is provided with a first outer spline and a second inner spline, the first outer spline and the first inner spline are meshed to form a first spline pair, the outer spline shaft is provided with a second outer spline, and the second outer spline and the second inner spline are meshed to form a second spline pair. The oil distributing sleeve is arranged in the cavity, the oil nozzle is installed on the outer spline shaft, so that lubricating oil is sprayed into the cavity through the oil nozzle, part of the lubricating oil is reserved on one side of the oil distributing sleeve so as to lubricate the second spline pair in an oil bath mode, and the other part of the lubricating oil enters the other side of the oil distributing sleeve through an oil throwing hole in the oil distributing sleeve so as to lubricate the first spline pair in an oil throwing mode. And multi-point continuous forced lubrication is carried out on a plurality of spline pairs in a limited space.

Description

Technical Field

[0001] This invention relates to the field of aircraft engine transmission system structure technology, and more specifically, to an accessory gearbox lubrication structure and an aircraft engine transmission system. Background Technology

[0002] The aero-engine industry is a unique industry, a culmination of cutting-edge technologies. The aero-engine transmission system is the mechanical transmission device of the engine's power transmission system, and a crucial component of it is a gearbox with multiple mounting mounts—the accessory drive gearbox. The primary function of the accessory drive gearbox is to enable all accessories to operate simultaneously.

[0003] With the development of aero-engine technology, the overall aircraft demands high technical specifications for accessory drive gearboxes in terms of high temperature, high speed, heavy load, light weight, long service life, and high reliability. The accessory drive gearbox consists of several gears, bearings, and internal splines. The harsh working environment necessitates appropriate cooling methods for the high-speed rotating gears, bearings, and splines. Currently, the lubricating oil requirement of the accessory drive gearbox is determined through lubricating oil simulation calculations at the gear meshing points and bearings, based on the actual capacity of the lubricating oil pump. The rational selection of lubrication methods, oil injection speed, and oil supply at gear meshing points and bearings plays a crucial role in preventing gear and bearing failure. However, some splines in the accessory drive gearbox cannot even achieve direct jet lubrication and cooling. Currently, in traditional thinking, splines are often considered ordinary connecting parts in a stationary state, not subject to active jet lubrication. However, during actual operation, such as takeoff, cruise, and landing, internal and external splines are subjected to high cyclic loads for extended periods, resulting in fretting wear, which poses a serious threat to the long-term safe operation of the transmission system. Therefore, lubrication of splines is also crucial, and designing a structure that can meet the lubrication requirements of splines in the case of limited space in the accessory gearbox has become a technical problem that needs to be solved in this field. Summary of the Invention

[0004] The purpose of this invention is to provide a lubrication structure for an accessory gearbox, which can improve the technical problem in the prior art where the spline lubrication structure cannot be designed due to limited space and other reasons, and provide a very favorable guarantee for the spline oil supply of the accessory transmission gearbox.

[0005] The present invention also aims to provide an aircraft engine transmission system that can improve the technical problem in the prior art where the spline lubrication structure cannot be designed due to limited space and other reasons, and provide a very favorable guarantee for the spline oil supply of the accessory transmission gearbox.

[0006] Embodiments of the present invention can be implemented in the following ways:

[0007] An accessory gearbox lubrication structure, the accessory gearbox lubrication structure comprising:

[0008] A gear shaft, wherein a first internal spline is provided inside the gear shaft, and a first chamber is provided on one side of the first internal spline;

[0009] An internal spline shaft, one end of which is provided with a first external spline, the first external spline meshing with the first internal spline to form a first spline pair; the internal spline shaft has a cavity penetrating the internal spline shaft, and a second internal spline is provided at the end of the cavity away from the first external spline;

[0010] An external spline shaft, wherein a second external spline is provided on the outside of the external spline shaft, and the second external spline meshes with the second internal spline to form a second spline pair;

[0011] An oil distribution sleeve, wherein the oil distribution sleeve is installed in the cavity and divides the cavity into a second chamber and a third chamber located on both sides of the oil distribution sleeve; the oil distribution sleeve is provided with an oil slinger hole, the oil slinger hole connecting the second chamber and the third chamber; and

[0012] An oil injector is mounted on the external spline shaft and is used to inject lubricating oil into the cavity;

[0013] Part of the lubricating oil injected into the cavity by the oil injector is retained in the third chamber to lubricate the second spline pair with an oil bath, and another part of the lubricating oil is used to enter the second chamber through the oil slinger hole. The second chamber is connected to the first chamber to lubricate the first spline pair with oil slinger.

[0014] Optionally, the oil distribution sleeve includes a cylinder and an end plate disposed at one end of the cylinder, the end plate covering one side of the cylinder, and the oil throwing hole is disposed on the end plate; the end plate is located on the side of the cylinder near the second spline pair.

[0015] Optionally, the oil distribution sleeve is provided with a plurality of oil throwing holes, and the plurality of oil throwing holes are distributed around the axial direction of the oil distribution sleeve;

[0016] The sum of the flow cross-sectional areas of the plurality of oil slingers is greater than or equal to 10% of the cross-sectional area of ​​the oil distribution sleeve.

[0017] Optionally, the distance between the oil slinger hole and the center of the oil distribution sleeve is 3 / 5 of the radius of the oil distribution sleeve.

[0018] Optionally, the oil-slinging hole is a cylindrical hole.

[0019] Optionally, the gear shaft is further provided with a mounting groove located on the peripheral wall of the first chamber; the accessory gearbox lubrication structure further includes an oil retainer ring installed in the mounting groove, the oil retainer ring being used to limit the lubricating oil in the first chamber to ensure lubrication of the first spline pair.

[0020] Optionally, the inner diameter of the oil baffle ring is greater than or equal to the pitch circle diameter of the first external spline, and the inner diameter of the oil baffle ring is smaller than the major diameter of the first external spline.

[0021] Optionally, the mounting groove is a rectangular groove; the width of the mounting groove is d, 2mm < d < 3mm; the depth of the mounting groove is h, 1mm < h < 3mm.

[0022] Optionally, the outer peripheral surface of the internal spline shaft is provided with a shoulder, and an annular groove is provided on the shoulder. The accessory gearbox lubrication structure further includes a rubber ring, which is installed in the annular groove and mates with the inner peripheral surface of the gear shaft.

[0023] Optionally, the shoulder is further provided with an oil drain groove, and a plurality of the oil drain grooves are distributed circumferentially along the inner spline shaft; the oil drain grooves extend axially along the inner spline shaft and penetrate the shoulder, so that the lubricating oil on one side of the rubber ring moves to the other side of the rubber ring through the oil drain grooves.

[0024] Optionally, the gear shaft further includes a third internal spline disposed on the inner peripheral wall of the first chamber.

[0025] An aircraft engine transmission system, the aircraft engine transmission system including the above-mentioned accessory gearbox lubrication structure.

[0026] The beneficial effects of the accessory gearbox lubrication structure and aero-engine transmission system provided in the embodiments of the present invention include:

[0027] An embodiment of the present invention provides a lubrication structure for an accessory gearbox, comprising a gear shaft, an internal spline shaft, an external spline shaft, an oil distributor sleeve, and an oil injector. The gear shaft contains a first internal spline and a first chamber located on one side of the first internal spline. The internal spline shaft is a hollow shaft with a cavity. One end of the internal spline shaft has a first external spline, which meshes with the first internal spline to form a first spline pair. A second internal spline is located at the end of the cavity away from the first external spline. The external spline shaft also has a second external spline, which meshes with the second internal spline to form a second spline pair. The oil distributor sleeve is disposed within the cavity, thereby dividing the cavity into a second chamber and a third chamber located on either side of the oil distributor sleeve. The second spline pair is located in the third chamber, and the second chamber communicates with the first chamber. The oil distributor sleeve has an oil slinger hole that connects the second and third chambers. The oil injector is installed on the external spline shaft, so that lubricating oil is sprayed into the cavity through the oil injector. Part of the lubricating oil remains in the third chamber, thus providing oil bath lubrication for the second spline pair. The other part enters the second chamber through the oil slinger hole and can flow into the first chamber from the second chamber, thus slinging oil to lubricate the first spline pair. This achieves multi-point continuous forced lubrication of multiple spline pairs in a limited space, providing a strong guarantee for the oil supply of accessories from the splines of the gearbox.

[0028] Embodiments of the present invention also provide an aircraft engine transmission system, which includes the above-mentioned accessory gearbox lubrication structure, and thus also has the beneficial effect of realizing multi-point continuous forced lubrication of multiple spline pairs in a limited space, providing a strong guarantee for the accessory to be supplied with oil from the splines of the gearbox. Attached Figure Description

[0029] The above-described features and advantages of the present invention will be better understood after reading the following detailed description of embodiments of the present disclosure in conjunction with the accompanying drawings. In the drawings, components are not necessarily drawn to scale, and components having similar related properties or features may have the same or similar reference numerals.

[0030] Figure 1 A schematic diagram of the structure of the accessory gearbox spline lubrication structure provided according to one aspect of the present invention is shown;

[0031] Figure 2 A schematic diagram of the oil distribution sleeve in the accessory gearbox spline lubrication structure provided according to one aspect of the present invention is shown;

[0032] Figure 3 A schematic diagram of the internal spline shaft in the accessory gearbox spline lubrication structure provided according to one aspect of the present invention is shown;

[0033] Figure 4 A schematic diagram of the oil distribution sleeve in the accessory gearbox spline lubrication structure provided according to one aspect of the present invention is shown from another perspective.

[0034] Figure 5 A schematic diagram of another accessory gearbox lubrication structure provided according to one aspect of the present invention is shown.

[0035] Figure label:

[0036] 100 - Lubrication structure of accessory gearbox; 110 - Gear shaft; 111 - First internal spline; 112 - First chamber; 113 - Oil retaining ring; 114 - Mounting groove; 115 - First end; 116 - Second end; 117 - Third internal spline; 120 - Internal spline shaft; 121 - First external spline; 122 - Second internal spline; 123 - Second chamber; 124 - Third chamber; 125 - First shoulder; 126 - Second shoulder; 127 - Annular groove; 128 - Rubber ring; 129 - Oil drain groove; 130 - External spline shaft; 131 - Second external spline; 140 - Oil distribution sleeve; 141 - Cylinder; 142 - End plate; 143 - Oil slinger hole; 144 - Distribution trajectory; 150 - Oil injector; 161 - First spline pair; 162 - Second spline pair. Detailed Implementation

[0037] The present invention will now be described in detail with reference to the accompanying drawings and specific embodiments. It should be noted that the aspects described below with reference to the accompanying drawings and specific embodiments are merely exemplary and should not be construed as limiting the scope of protection of the present invention in any way.

[0038] In the description of this invention, it should be noted that if terms such as "upper," "lower," "inner," "outer," or "vertical" appear, the orientation or positional relationship indicated is based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship in which the product of this invention is usually placed when in use, and does not indicate or imply that the device or element referred to must have a specific orientation or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this invention.

[0039] At the same time, it should be noted that the terms "first" and "second" are used only for distinguishing descriptions and should not be interpreted as indicating or implying relative importance.

[0040] In the description of this invention, it should also be noted that, unless otherwise explicitly specified or limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, an integral connection, or a detachable connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium, or a connection within two components, etc. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0041] Figure 1 This is a schematic diagram of the spline lubrication structure of the gearbox provided in this embodiment. Figure 2 This is a schematic diagram of the oil distribution sleeve 140 in the gearbox spline lubrication structure provided in this embodiment. Figure 3 This is a schematic diagram of the internal spline shaft 120 in the spline lubrication structure of the gearbox provided in this embodiment. Please refer to the attached diagram. Figures 1-3 This embodiment provides an accessory gearbox spline lubrication structure, and correspondingly, also provides an aero-engine transmission system.

[0042] The aero-engine transmission system includes an accessory gearbox spline lubrication structure, as well as gear structures and other components that are connected to the gear shaft 110 in the accessory gearbox spline lubrication structure.

[0043] The accessory gearbox spline lubrication structure includes a gear shaft 110, an internal spline shaft 120, an external spline shaft 130, an oil distribution sleeve 140, and an oil injector 150. The gear shaft 110 contains a first internal spline 111 and a first chamber 112 located on one side of the first internal spline 111. The internal spline shaft 120 is a hollow shaft with a cavity. One end of the internal spline shaft 120 has a first external spline 121, which meshes with the first internal spline 111 to form a first spline pair 161. A second internal spline 122 is located at the end of the cavity away from the first external spline 121. The external spline shaft 130 has a second external spline 131, which meshes with the second internal spline 122 to form a second spline pair 162. The oil distribution sleeve 140 is disposed in the cavity, thereby dividing the cavity into a second chamber 123 and a third chamber 124 located on both sides of the oil distribution sleeve 140. The second spline pair 162 is located in the third chamber 124, and the second chamber 123 communicates with the first chamber 112. The oil distribution sleeve 140 is provided with an oil slinger hole 143, which connects the second chamber 123 and the third chamber 124. The oil injector 150 is mounted on the external spline shaft 130, thereby spraying lubricating oil into the cavity through the oil injector 150. Part of the lubricating oil remains in the third chamber 124, thus providing oil bath lubrication for the second spline pair 162, while the other part enters the second chamber 123 through the oil slinger hole 143 and flows into the first chamber 112 through the second chamber 123, thus slinging oil to lubricate the first spline pair 161. This achieves multi-point continuous forced lubrication of multiple spline pairs in a limited space, providing a strong guarantee for the supply of oil from the splines of the gearbox to the accessories.

[0044] The following is a further description of the spline lubrication structure of the gearbox provided in this embodiment:

[0045] Please continue to refer to the reference. Figures 1-3In this embodiment, the gear shaft 110 is a hollow shaft with a first end 115 and a second end 116 at its two axial ends. The first end 115 is the end of the gear shaft 110 near the accessory housing, and the second end 116 is the end of the gear shaft 110 near the accessory. A first internal spline 111 is provided on the inner circumferential surface of the gear shaft 110. The first internal spline 111 is located closer to the first end 115 than the second end 116, and the first chamber 112 is the space on the side of the first internal spline 111 near the first end 115.

[0046] In this embodiment, a mounting groove 114 is also provided on the gear shaft 110, and the mounting groove 114 is located on the peripheral wall of the first chamber 112. The accessory gearbox lubrication structure 100 also includes an oil retainer ring 113 installed in the mounting groove 114. The oil retainer ring 113 is used to limit the lubrication in the first chamber 112 to ensure lubrication of the first spline pair 161. Specifically, the first chamber 112 can be regarded as the space between the oil retainer ring 113 and the first spline pair 161. The lubricating oil entering the first chamber 112 forms an oil dam at the oil retainer ring 113, thereby causing the lubricating oil to flow back to the first spline pair 161, ensuring effective lubrication of the first spline pair 161 and enhancing the cooling effect.

[0047] Optionally, the inner diameter of the oil baffle ring 113 is greater than or equal to the pitch circle diameter of the first external spline 121, while the inner diameter of the oil baffle ring 113 is smaller than the major diameter of the first external spline 121. The oil baffle ring 113 effectively blocks lubricating oil in the first chamber 112, ensuring lubrication of the first spline pair 161. Simultaneously, when the lubricating oil level in the first chamber 112 reaches the inner diameter of the oil baffle ring 113 (i.e., the lubricating oil level is not higher than the pitch circle diameter of the first external spline 121), the lubricating oil can pass over the oil baffle ring 113, thus preventing excessive oil accumulation in the first chamber 112. Optionally, in this embodiment, the dimensions of the oil baffle ring 113 can be set to an outer diameter of 35mm to 37mm and an inner diameter of 25mm to 27mm. Optionally, the material of the oil baffle ring 113 can be rubber.

[0048] Optionally, the mounting groove 114 is a rectangular groove. Correspondingly, in this embodiment, the oil baffle ring 113 can be a circular ring with a rectangular cross-sectional shape. Optionally, the groove width of the mounting groove 114 is d, where 2mm < d < 3mm. The groove depth of the mounting groove 114 is h, where 1mm < h < 3mm. Optionally, the groove width of the mounting groove 114 can be set to 2.5mm; the groove depth of the mounting groove 114 can be set to 2mm.

[0049] In this embodiment, the internal spline shaft 120 is a hollow shaft with a cavity extending from one end to the other. A first external spline 121 is provided on the outer circumferential surface of one end of the internal spline shaft 120, and the first external spline 121 meshes with the first internal spline 111 to form a first spline pair 161. A second internal spline 122 is provided on the inner circumferential surface of the internal spline shaft 120, and the first external spline 121 and the second internal spline 122 are located at opposite ends of the axial direction of the internal spline shaft 120. Specifically, when the first external spline 121 meshes with the first internal spline 111, the second internal spline 122 is closer to the second end 116 than the first external spline 121. During installation, the internal spline shaft 120 can be installed from the second end 116 side of the gear shaft 110 to the first end 115 side, thereby avoiding detachment or damage to the oil retainer ring 113 during installation and disassembly.

[0050] The oil distribution sleeve 140 is installed inside the inner spline shaft 120, thereby dividing the cavity of the inner spline shaft 120 into a second chamber 123 and a third chamber 124. The second chamber 123 is the chamber of the oil distribution sleeve 140 near the first outer spline 121. This chamber has an opening at its end that connects to the first chamber 112, allowing the lubricating oil entering the second chamber 123 to flow smoothly into the first chamber 112, thus achieving lubrication of the first spline pair 161. The third chamber 124 is the chamber of the oil distribution sleeve 140 near the second inner spline 122. The oil distribution sleeve 140 is provided with an oil slinger hole 143, which connects the second chamber 123 and the third chamber 124.

[0051] In this embodiment, the external spline shaft 130 is a hollow shaft, and a second external spline 131 is provided on the outer circumferential surface of the external spline shaft 130. The second external spline 131 meshes with the second internal spline 122 to form a second spline pair 162. An oil injector 150 is installed inside the external spline shaft 130, and the oil injector 150 is used to spray lubricating oil into the cavity inside the internal spline shaft 120. That is, the oil injector 150 sprays lubricating oil toward the oil distribution sleeve 140. Part of the lubricating oil passes through the oil throwing hole 143 into the second chamber 123, and then passes through the second chamber 123 into the first chamber 112, realizing oil throwing lubrication of the first spline pair 161; another part of the lubricating oil is blocked by the oil distribution sleeve 140 and falls into the third chamber 124, thereby accumulating in the third chamber 124 to realize oil bath lubrication of the second spline pair 162.

[0052] Optionally, the oil distribution sleeve 140 includes a cylinder 141 and an end plate 142 disposed at one end of the cylinder 141. The end plate 142 closes one side of the cylinder 141, and an oil slinger hole 143 is disposed on the end plate 142, meaning that lubricating oil on one side of the end plate 142 can only flow to the other side through the oil slinger hole 143. The end plate 142 is located on the side of the cylinder 141 near the second spline pair 162.

[0053] Specifically, the oil distributor sleeve 140 is a cup-shaped structure closed at one end. The cylindrical body 141 forms the cup body of this cup-shaped structure, and the end plate 142 forms the cup bottom. The oil slinger hole 143 is formed on the end plate 142. When the oil distributor sleeve 140 is installed in the cavity of the inner spline shaft 120, the outer circumferential surface of the cylindrical body 141 is interference-fitted with the inner spline shaft 120, thereby ensuring the sealing between the cylindrical body 141 and the inner spline shaft 120. The end plate 142 is located on the side of the cylindrical body 141 near the second spline pair 162, that is, the end plate 142 is located on the side near the oil injector 150 and is directly opposite the oil injector 150. Optionally, the interference fit between the cylindrical body 141 and the inner spline shaft 120 is 0.027mm to 0.059mm.

[0054] Figure 4 This is a schematic diagram of the oil distribution sleeve 140 in the spline lubrication structure of the gearbox provided in this embodiment, viewed from another perspective. Specifically, this perspective is directed at the end plate 142. Please refer to the reference. Figures 1-4 In this embodiment, the oil distribution sleeve 140 is provided with a plurality of oil throwing holes 143, which are distributed around the axial direction of the oil distribution sleeve 140. Furthermore, the sum of the flow cross-sectional areas of the plurality of oil throwing holes 143 is greater than or equal to 10% of the cross-sectional area of ​​the oil distribution sleeve 140.

[0055] Specifically, in this embodiment, the oil distribution sleeve 140 is provided with four oil-throwing holes 143, which are evenly distributed around the axis of the oil distribution sleeve 140. The sum of the flow cross-sectional areas of the four oil-throwing holes 143 is greater than or equal to 10% of the cross-sectional area of ​​the oil distribution sleeve 140; in other words, the sum of the flow cross-sectional areas of the four oil-throwing holes 143 is not less than 10% of the outer circumferential area of ​​the cylinder 141.

[0056] It is understood that in some other embodiments, the number of oil-throwing holes 143 and the flow cross-sectional area of ​​a single oil-throwing hole 143 can be specifically set according to needs.

[0057] Optionally, the distance between the oil slinger hole 143 and the center of the oil distribution sleeve 140 is 3 / 5 of the radius of the oil distribution sleeve 140. Specifically, since the multiple oil slinger holes 143 are distributed around the axis of the oil distribution sleeve 140, the distribution trajectory 144 of the multiple oil slinger rings is a circular trajectory concentric with the oil distribution sleeve 140 (e.g., ...). Figure 4 (As shown by the dashed line in the diagram). The radius of the distribution trajectory 144 of the multiple oil slinger rings is r1, the radius of the oil distribution sleeve 140 is r2, and the distance from the oil slinger hole 143 to the center of the oil distribution sleeve 140 is 3 / 5 of the radius of the oil distribution sleeve 140, i.e., r1 = (3 / 5)r2.

[0058] By setting the oil slinger hole 143, excessive oil accumulation in the third chamber 124 is avoided, thereby preventing imbalance in the gear shaft 110 and helping to improve the reliability and safety of the transmission system.

[0059] Optionally, the oil slinger hole 143 is a cylindrical hole, that is, the cross-sectional area of ​​the oil slinger hole 143 is the same at all points along the axial direction of the oil distribution sleeve 140.

[0060] Please refer to the reference again. Figures 1-3 In this embodiment, the outer peripheral surface of the inner spline shaft 120 is provided with a shoulder, which is a first shoulder 125. An annular groove 127 is provided on the first shoulder 125. The accessory gearbox lubrication structure 100 also includes a rubber ring 128, which is installed in the annular groove 127 and mates with the inner peripheral surface of the gear shaft 110. By providing the rubber ring 128, it can, on the one hand, play a role in vibration damping; on the other hand, through the mating of the rubber ring 128 with the inner peripheral surface of the gear shaft 110, it can, to a certain extent, prevent lubricating oil from flowing out of the first chamber 112 along the direction from the first end 115 to the second end 116, thereby ensuring the lubrication effect.

[0061] Furthermore, the first shoulder 125 is also provided with oil drain grooves 129, and multiple oil drain grooves 129 are distributed circumferentially along the inner spline shaft 120. Simultaneously, the oil drain grooves 129 extend axially along the inner spline shaft 120 and penetrate the first shoulder 125. Thus, the rubber ring 128 at the oil drain groove 129 has a smaller obstruction effect on the lubricating oil. On the side of the rubber ring 128 near the second end 116, i.e. Figure 1 When a large amount of lubricating oil accumulates on the right side of the structure shown, the lubricating oil can flow through the oil drain groove 129 to the other side of the rubber ring 128, i.e. Figure 1 The flow is directed to the left side of the structure shown, thus preventing oil accumulation points from forming on the right side of the rubber ring 128.

[0062] Specifically, the outer circumferential surface of the inner spline shaft 120 near the second end 116 of the gear shaft 110 is provided with a second shoulder 126, and a retaining ring is also provided at the second shoulder 126. Through the cooperation between the second shoulder 126 and the gear shaft 110, and the blocking effect of the retaining ring, the lubricating oil outside the gear shaft 110 can be prevented from entering the gap between the inner spline shaft 120 and the outer spline shaft 130. However, in actual operation, it is still inevitable that some lubricating oil will flow over the retaining ring and the second shoulder 126 to the right side of the rubber ring 128. By providing the oil drain groove 129, the lubricating oil on the right side of the rubber ring 128 can flow to the left side of the rubber ring 128, thus avoiding the formation of oil accumulation points on the right side of the rubber ring 128.

[0063] Optionally, in this embodiment, four oil drain grooves 129 are provided on the first shoulder 125, and the four oil drain grooves 129 are evenly distributed along the circumference of the first shoulder 125. It can be understood that in other embodiments, the position and number of oil drain grooves 129 can also be specifically set according to needs.

[0064] It should be noted that, as Figure 1As shown, in this embodiment, the oil distribution sleeve 140 enables the lubricating oil sprayed from the nozzle 150 to achieve forced lubrication of two spline pairs. It is understood that in other embodiments, lubrication of more splines can also be achieved. As an example, Figure 5 Another accessory gearbox lubrication structure 100 provided in this embodiment is shown, such as... Figure 5 As shown, in this alternative accessory gearbox lubrication structure 100, the gear shaft 110 further includes a third internal spline 117. The third internal spline 117 is disposed on the inner peripheral wall of the first chamber 112. Accordingly, in use, the third internal spline 117 can mesh with another spline shaft with an external spline to form a third spline pair. Thus, the third spline pair is located in the first chamber 112, and the lubricating oil in the first chamber 112 can lubricate the third spline pair. Specifically, the oil baffle ring 113 is disposed on the side of the third internal spline 117 away from the first internal spline 111.

[0065] The accessory gearbox lubrication structure 100 and the aero-engine transmission system provided in the embodiments of the present invention, in use, the injector 150 sprays lubricating oil into the oil distribution sleeve 140. A portion of the lubricating oil passes through the oil slinger hole 143 into the second chamber 123, and then through the second chamber 123 into the first chamber 112 to achieve oil sling lubrication of the first spline pair 161. Another portion of the lubricating oil is blocked by the end plate 142 and remains in the third chamber 124, thus forming an oil pool in the third chamber 124 to provide oil bath lubrication for the second spline pair 162. This accessory gearbox lubrication structure 100 has a simple structure and can provide continuous and quantitative lubricating oil to multiple spline pairs in the confined space of the accessory transmission gearbox, ensuring effective lubrication and cooling of multiple spline pairs and guaranteeing the effective operation of the transmission system. Furthermore, this spline lubrication structure has no oil accumulation points, simple processing technology, and low cost, making it highly practical.

[0066] The above description is merely a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in the present invention should be included within the scope of protection of the present invention.

Claims

1. A lubrication structure for an accessory gearbox, characterized in that, The accessory gearbox lubrication structure includes: A gear shaft, wherein a first internal spline is provided inside the gear shaft, and a first chamber is provided on one side of the first internal spline; An internal spline shaft, one end of which is provided with a first external spline, the first external spline meshing with the first internal spline to form a first spline pair; the internal spline shaft has a cavity penetrating the internal spline shaft, and a second internal spline is provided at the end of the cavity away from the first external spline; An external spline shaft, wherein a second external spline is provided on the outside of the external spline shaft, and the second external spline meshes with the second internal spline to form a second spline pair; An oil distribution sleeve, wherein the oil distribution sleeve is installed in the cavity and divides the cavity into a second chamber and a third chamber located on both sides of the oil distribution sleeve; the oil distribution sleeve is provided with an oil slinger hole, the oil slinger hole connecting the second chamber and the third chamber; and An oil injector is mounted on the external spline shaft and is used to inject lubricating oil into the cavity; Part of the lubricating oil injected into the cavity by the oil injector is retained in the third chamber to lubricate the second spline pair with an oil bath, and another part of the lubricating oil is used to enter the second chamber through the oil slinger hole. The second chamber is connected to the first chamber to lubricate the first spline pair with oil slinger.

2. The accessory gearbox lubrication structure according to claim 1, characterized in that, The oil distribution sleeve includes a cylinder and an end plate disposed at one end of the cylinder. The end plate covers one side of the cylinder, and the oil throwing hole is disposed on the end plate. The end plate is located on the side of the cylinder near the second spline pair.

3. The accessory gearbox lubrication structure according to claim 1, characterized in that, The oil distribution sleeve is provided with a plurality of oil throwing holes, which are distributed around the axial direction of the oil distribution sleeve; The sum of the flow cross-sectional areas of the plurality of oil slingers is greater than or equal to 10% of the cross-sectional area of ​​the oil distribution sleeve.

4. The accessory gearbox lubrication structure according to claim 3, characterized in that, The distance between the oil sling hole and the center of the oil distribution sleeve is 3 / 5 of the radius of the oil distribution sleeve.

5. The accessory gearbox lubrication structure according to claim 1, characterized in that, The oil-throwing hole is a cylindrical hole.

6. The accessory gearbox lubrication structure according to claim 1, characterized in that, The gear shaft is also provided with a mounting groove, which is located on the peripheral wall of the first chamber; the accessory gearbox lubrication structure also includes an oil retainer ring installed in the mounting groove, which is used to limit the lubricating oil in the first chamber to ensure lubrication of the first spline pair.

7. The accessory gearbox lubrication structure according to claim 6, characterized in that, The inner diameter of the oil baffle ring is greater than or equal to the pitch circle diameter of the first external spline, and the inner diameter of the oil baffle ring is smaller than the major diameter of the first external spline.

8. The accessory gearbox lubrication structure according to claim 6, characterized in that, The mounting groove is a rectangular groove; the width of the mounting groove is d, 2mm < d < 3mm; the depth of the mounting groove is h, 1mm < h < 3mm.

9. The accessory gearbox lubrication structure according to claim 1, characterized in that, The outer peripheral surface of the internal spline shaft is provided with a shoulder, and an annular groove is provided on the shoulder. The accessory gearbox lubrication structure also includes a rubber ring, which is installed in the annular groove and mates with the inner peripheral surface of the gear shaft.

10. The accessory gearbox lubrication structure according to claim 9, characterized in that, The shoulder is also provided with an oil drain groove, and a plurality of the oil drain grooves are distributed circumferentially along the inner spline shaft; the oil drain grooves extend axially along the inner spline shaft and penetrate the shoulder, so that the lubricating oil on one side of the rubber ring moves to the other side of the rubber ring through the oil drain grooves.

11. The accessory gearbox lubrication structure according to claim 1, characterized in that, The gear shaft also includes a third internal spline, which is disposed on the inner peripheral wall of the first chamber.

12. An aircraft engine transmission system, characterized in that, The aircraft engine transmission system includes the accessory gearbox lubrication structure as described in any one of claims 1-11.

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