Reduction gearbox assembly, method of manufacture and aeroengine

Abstract

The application discloses a reduction gearbox assembly, a manufacturing method and an aero-engine, and relates to the technical field of aero-engine manufacturing, and specifically relates to a reduction gearbox assembly, a manufacturing method and an aero-engine. The reduction gearbox assembly comprises a casing assembly, a gear pair and a gear shaft. The casing assembly is used as a support and is provided with a first bearing seat hole and a first positioning hole on the same side. The first end of the gear shaft is rotatably mounted on the first bearing seat hole through a bearing. The bearing support is in the shape of a thin-walled plate and is mounted on the casing assembly. The bearing support is provided with a second bearing seat hole matched with the position of the first bearing seat hole and a second positioning hole matched with the position of the first positioning hole. The second end of the gear shaft is rotatably mounted on the second bearing seat hole through a bearing. The bearing support is stacked on the matching surface of the casing assembly to synchronously machine the bearing holes and the positioning holes, thereby greatly improving the machining precision and the consistency between the bearing holes and the positioning holes. The high machining cost and the high machining difficulty caused by the high position degree and parallelism requirement of the bearing seat hole and the positioning pin hole are avoided, and the machining cost is effectively reduced.

Description

Technical Field

[0001] This invention relates to the field of aero engines, and in particular to a gearbox assembly, a manufacturing method, and an aero engine. Background Technology

[0002] In aero engines, the gearbox is typically used as an accessory mounting unit, characterized by low load and high speed. It contains a large number of accessories, and to ensure sufficient space for maintenance and operation of each accessory, the center distance between the gear shafts is generally large, and the gears are mostly thin-spoke cylindrical gears.

[0003] The gear shaft is generally a simply supported structure, with bearings at both ends supporting it. Currently, the configuration of typical accessory gearboxes involves the gear shaft being supported on the bearing housing holes of the front and rear housings, respectively. The front and rear housings are positioned by locating pins and secured with bolts. Since the front and rear housings are machined separately, to ensure the coaxiality of the bearing housing holes on both sides of the gear shaft, the bearing housing holes on both housings require a very high degree of positional accuracy for the locating pins, significantly increasing machining costs. Some reducers, such as planetary reducers, divide the reducer housing into three detachable parts for easy assembly and disassembly. The connection and positioning between the housings will increase the axial length, total weight, and machining cost of the reducer.

[0004] In summary, existing gearboxes have at least the following shortcomings:

[0005] (1) The existing gearbox is mainly composed of front and rear housings. The two are centered and angularly positioned by setting locating pins and stops, and fastened by bolts. In order to ensure the coaxiality of the bearing seat holes of the front and rear gear shafts, the machining accuracy of the bearing seat holes of the front and rear housings relative to the stops and locating pin holes is extremely high, resulting in high cost.

[0006] (2) There are two gearboxes with accessories. They are heavy and have long axial dimensions. In order to ensure the axial movement of each gear shaft, the adjusting shims need to be ground. However, due to the dispersion of manufacturing tolerances, the interchangeability of the adjusting shims is poor.

[0007] (3) Gearbox bearings need to be equipped with anti-rotation bosses or installed flanges to prevent the outer ring of the bearing from rotating circumferentially, which will increase the weight of the bearing and the bearing housing accordingly.

[0008] (4) The axial limit of the gear shaft is mainly achieved by the combination of the adjusting shim and the bearing end cover. The bearing end cover is connected to the casing by bolts. The axial dimension accuracy of the bearing end cover is required to be high, and the connection between the bearing end cover and the casing will increase the weight. Summary of the Invention

[0009] This invention provides a gearbox assembly, a manufacturing method, and an aero-engine to solve the technical problems of low power-to-weight ratio in existing gearboxes and high cost in ensuring the accuracy of corresponding bearing seat holes in the two gearboxes.

[0010] The technical solution adopted in this invention is as follows:

[0011] A gearbox assembly, used in an aircraft engine, includes:

[0012] A housing assembly for use as a support, the housing assembly having a first bearing seat hole and a first positioning hole located on the same side;

[0013] Gear pairs are used for power transmission;

[0014] A gear shaft is used to mount a gear pair. The first end of the gear shaft is rotatably mounted in the first bearing housing hole via a bearing.

[0015] The bearing bracket, in the form of a thin-walled plate, is mounted on the housing assembly. The bearing bracket is provided with a second bearing seat hole that matches the position of the first bearing seat hole and a second positioning hole that matches the position of the first positioning hole. The second end of the gear shaft is rotatably mounted in the second bearing seat hole via a bearing.

[0016] As a further improvement to the above technical solution, the casing assembly includes a gear casing whose length matches that of the gear shaft, and a core bearing casing connected to the gear casing; the inner cavity of the core bearing casing communicates with the inner cavity of the gear casing.

[0017] As a further improvement to the above technical solution, the casing assembly also includes an oil tank disposed in the gear casing and located below the gear pair, the bearing mounting position of the core machine bearing casing smoothly transitions to the connection position with the gear casing, and any position on the inner wall of the core machine bearing casing is higher than the oil tank.

[0018] As a further improvement to the above technical solution, the gear pair includes an input gear mounted on a gear shaft and an auxiliary gear mounted on another gear shaft, wherein the input gear and the auxiliary gear are drivenly connected; the gearbox assembly also includes an elastic shaft, wherein the input gear is provided with an internal spline, the first end of the elastic shaft is provided with an external spline that matches the internal spline of the input gear, and the second end of the elastic shaft is used to connect to the rotor of the core machine.

[0019] As a further improvement to the above technical solution, the gear pair also includes a compound idler gear, which includes a large gear, a small gear and a centrifugal ventilator connected coaxially, and the compound idler gear meshes with the input gear and the additional gear respectively.

[0020] As a further improvement to the above technical solution, the gearbox assembly further includes an adjustment component disposed on the gear shaft. The adjustment component includes at least one annular adjustment shim of at least one specification. The adjustment component is used to match the actual value of the gear shaft dimension chain with the design value.

[0021] As a further improvement to the above technical solution, the gearbox assembly also includes a bearing baffle mounted on the bearing bracket, the bearing baffle being used to axially limit the second bearing mounted on the bearing bracket.

[0022] As a further improvement to the above technical solution, the span of the bearing installed on one side of the casing assembly is smaller than the span of the bearing installed on one side of the bearing bracket, so as to reduce the force on the bearing installed on one side of the bearing bracket.

[0023] According to another aspect of the present invention, a method for manufacturing a gearbox assembly is also provided, for manufacturing any of the gearbox assemblies described above, the method comprising:

[0024] Manufacturing of bearing housings, including casting or forging bearing housing components;

[0025] The bearing bracket workpiece is positioned and fixed at a preset position on the mating surface of the housing assembly;

[0026] The bearing bracket and casing assembly are machined together so that the first bearing seat hole and the second bearing seat hole are formed simultaneously, and the first positioning hole and the second positioning hole are machined simultaneously.

[0027] According to another aspect of the present invention, an aircraft engine is also provided, which utilizes any of the gearbox assemblies described above.

[0028] The present invention has the following beneficial effects: In this gearbox assembly, only the bearing seat holes and positioning holes located on the same side are machined on the gearbox casing. By setting a thin-walled plate-shaped bearing bracket, a second bearing seat hole corresponding to the first bearing seat hole of the casing assembly and a second positioning hole corresponding to the first positioning hole are provided. The casing assembly is also used to provide installation for other accessories. The bearing bracket serves as a simplified casing and cooperates with the casing assembly to respectively install the bearings supporting both ends of the gear shaft. Its axial length is small, and the machining accuracy is easier to ensure. The same bearing can be used at both ends of a gear shaft. Furthermore, by superimposing the bearing bracket on the mating surface of the casing assembly, the bearing holes and positioning holes are machined synchronously, which greatly improves the machining accuracy and the consistency between them. This avoids the high machining cost and high machining difficulty caused by the high positional and parallel requirements of the bearing seat holes and positioning pin holes, and effectively reduces the machining cost.

[0029] This gearbox assembly is used in aero engines. The casing assembly includes a gear casing that matches the length of the gear shaft and a core engine bearing casing that connects to the gear casing. By setting a bearing bracket, the inner cavity of the core engine bearing casing and the inner cavity of the gear casing are interconnected. Compared with the traditional casing connection structure, this is more simplified, shortens the axial length of the aero engine casing, and significantly reduces the weight of the casing. It achieves higher transmission efficiency with a smaller weight, which is more in line with the high power density transmission requirements of aero engines.

[0030] In addition to the objectives, features, and advantages described above, the present invention has other objectives, features, and advantages. The invention will now be described in further detail with reference to the accompanying drawings. Attached Figure Description

[0031] The accompanying drawings, which form part of this application, are used to provide a further understanding of the invention. The illustrative embodiments of the invention and their descriptions are used to explain the invention and do not constitute an undue limitation of the invention. In the drawings:

[0032] Figure 1 This is a cross-sectional view of the gearbox assembly according to a preferred embodiment of the present invention;

[0033] Figure 2 This is a front view of a bearing bracket according to a preferred embodiment of the present invention;

[0034] Figure 3 This is a side view of a bearing bracket according to a preferred embodiment of the present invention;

[0035] Figure 4 This is a schematic diagram of the gear shaft mounting structure according to a preferred embodiment of the present invention;

[0036] Figure 5 This is a schematic diagram of the bearing baffle structure of a preferred embodiment of the present invention;

[0037] Figure 6 This is a schematic diagram of the semi-cylindrical groove structure of the bearing outer ring according to a preferred embodiment of the present invention;

[0038] Figure 7 This is a schematic diagram of the bearing anti-rotation structure of a preferred embodiment of the present invention;

[0039] Figure 8 This is a schematic diagram of the elastic shaft structure of a preferred embodiment of the present invention;

[0040] Figure 9 This is a schematic diagram of the composite idler wheel structure of a preferred embodiment of the present invention;

[0041] 1. Gear housing; 11. First bearing seat hole; 12. Oil tank; 2. Gear shaft; 3. Adjustment assembly; 4. Bearing bracket; 41. Second bearing seat hole; 42. Second positioning hole; 43. Reinforcing rib; 44. Bolt hole; 5. Elastic shaft; 6. Core machine bearing housing; 7. Bearing baffle; 8. Cylindrical pin; 9. Centrifugal ventilator; 10. Bearing; 101. Semi-cylindrical groove. Detailed Implementation

[0042] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other. The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0043] Reference Figures 1 to 9 A preferred embodiment of the present invention provides a gearbox assembly, comprising:

[0044] The casing assembly serves as a support, and the casing assembly has a first bearing seat hole 11 and a first positioning hole located on the same side;

[0045] Gear pairs are used for power transmission;

[0046] Gear shaft 2 is used to install a gear pair. The first end of gear shaft 2 is rotatably mounted in the first bearing seat hole 11 via a bearing.

[0047] The bearing bracket 4 is in the shape of a thin-walled plate and is mounted on the casing assembly. The bearing bracket 4 is provided with a second bearing seat hole 41 that matches the position of the first bearing seat hole 11 and a second positioning hole 42 that matches the position of the first positioning hole. The second end of the gear shaft 2 is rotatably mounted in the second bearing seat hole 41 through a bearing.

[0048] The bearing bracket 4 mainly includes a second bearing seat hole 41, a second mounting hole, and reinforcing ribs 43 connecting the holes. To improve the support rigidity of the bearing and the wear resistance of the seat hole, a steel bushing is preferred. The main body of the bearing bracket 4 is a thin-walled plate, which can be cast and then machined or forged and then machined. Its thickness is 1-1.5mm greater than the width of the bearing. The arrangement of the holes and reinforcing ribs 43 is set according to the layout and stress adaptability of the gear pair, and reinforcing plates can be further set at weak or main stress positions. To ensure positioning accuracy, at least 2-3 positioning holes are set to set positioning pins for precise positioning.

[0049] It should be understood that the number of first bearing housing holes 11 matches the number of gear shafts 2, and the same applies to second bearing housing holes 41; the specifications and processing requirements of each first bearing housing hole 11 match the gear shaft 2 and bearing required for its corresponding position; in this embodiment, the shaft diameters at both ends of any gear shaft 2 are the same, and the bearings used are the same, therefore the processing requirements of the corresponding set of first bearing housing holes 11 and second bearing housing holes 41 are the same, and the second bearing housing hole 41 is a through hole. Based on this, the bearing bracket 4 in this embodiment is in the shape of a thin-walled plate. After casting or forging, it is machined to position and fix the bearing bracket 4 on the housing assembly. The first bearing housing holes 11 and second bearing housing holes 41, the first positioning hole and the second positioning hole 42 are machined simultaneously, which greatly improves the positioning accuracy between the two, improves the coaxiality of the two bearings set coaxially, makes the accuracy easier to guarantee, and effectively reduces the processing cost, improves the processing efficiency and processing accuracy; in order to fix the bearing bracket on the housing assembly, bolt holes 44 are correspondingly provided on the housing assembly and the bearing bracket.

[0050] Understandably, in this gearbox assembly, only the bearing housing holes and positioning holes located on the same side are machined on the gearbox casing. By setting a thin-walled plate-shaped bearing bracket 4, a second bearing housing hole 41 corresponding to the first bearing housing hole 11 of the casing assembly and a second positioning hole 42 corresponding to the first positioning hole are provided. The casing assembly is also used to provide installation for other accessories. The bearing bracket 4 serves as a simplified casing and cooperates with the casing assembly to install the bearings supporting both ends of the gear shaft 2. Its axial length is small and the machining accuracy is easier to ensure. Based on the fact that the two ends of the gear shaft 2 use the same bearing in this embodiment, the bearing holes and positioning holes can be machined synchronously by superimposing the bearing bracket 4 on the mating surface of the casing assembly, which greatly improves the machining accuracy and the consistency between the two. This avoids the high machining cost and high machining difficulty caused by the high positional and parallel requirements of the bearing housing holes and positioning pin holes, and effectively reduces the machining cost.

[0051] Specifically, this gearbox assembly is used in aero engines. The casing assembly includes a gear casing 1 whose length matches that of the gear shaft 2, and a core engine bearing casing 6 connected to the gear casing 1. By setting a bearing bracket 4, the inner cavity of the core engine bearing casing 6 is connected to the inner cavity of the gear casing 1. Compared with the traditional casing connection structure, this is simpler, shortens the axial length of the aero engine casing, and significantly reduces the weight of the casing. It achieves higher transmission efficiency with a smaller weight, which is more in line with the high power density transmission requirements of aero engines.

[0052] Furthermore, the casing assembly also includes an oil tank 12 disposed in the gear casing 1 and located below the gear pair. The bearing mounting position of the core machine bearing casing 6 smoothly transitions to the connection position with the gear casing 1. Any position on the inner wall of the core machine bearing casing 6 is higher than the oil tank 12. Based on this, the axial length of the gear casing 1 is small. The oil tank 12 is integrated below the gear casing 1. The lubricating oil for the bearings and splines of the core machine can return to the oil tank 12 of the gear casing 1 under the action of gravity. This reduces the need for the return flow channel of the oil pump, simplifies the structure, weight and processing cost of the oil pump. The oil tank 12 can also maintain sufficient 'oil and gas' in the cavity, improving the ability of each gear and bearing to withstand the low oil environment.

[0053] It should be noted that the span of the bearing installed on one side of the casing assembly is smaller than the span of the bearing installed on the bearing bracket 4, so as to reduce the force on the bearing installed on the bearing bracket 4, thereby reducing the stress deformation of the bearing bracket 4, avoiding uneven distribution of tooth load on the gear pair, and improving the load-bearing capacity of the gear pair.

[0054] In this embodiment, the gear pair includes an input gear mounted on one gear shaft and additional gears mounted on other gear shafts. The input gear drives each additional gear. Each gear is mainly a thin-spoked disc-shaped spur gear. The spur gears are generally small-module, large-clearance involute spur gears, which can reduce meshing impact. The large clearance can increase the energy accumulation of lubricating oil, improve heat dissipation capacity, and increase the ability to operate without lubricating oil. Since the input gear generally meshes with two or more gears at the same time, in order to ensure full-width meshing, the input gear is 4-5mm wider than the other widest gears. This ensures that even if the two meshing gears have a certain amount of axial movement and manufacturing tolerances, they can still mesh at full width. In the high-speed heavy-load mode, the bearings on both sides of the gear shaft 2 are jet lubricated, while the other bearings are oil mist lubricated.

[0055] The gearbox assembly in this embodiment also includes an elastic shaft 5. The input gear is provided with an internal spline, and the first end of the elastic shaft 5 is provided with an external spline that matches the internal spline of the input gear. The first end of the elastic shaft 5 is connected to the input gear through its external spline. The second end of the elastic shaft 5 is used to connect to the rotor of the core machine. Both ends of the elastic shaft 5 are external splines, and an axial stop shoulder is provided in the middle. After the core machine is ignited normally, the shaft power is extracted through the elastic shaft 5 to drive the various accessories to work normally.

[0056] In this embodiment, as Figure 9As shown, the gear pair also includes a compound idler gear, which meshes with the input gear and the auxiliary gear respectively to increase the center distance. The input gear can directly mesh with the auxiliary gear or drive the auxiliary gear through the compound idler gear. The compound idler gear includes a large gear and a small gear connected coaxially, and a centrifugal ventilator 9 connected to the large gear. The centrifugal ventilator 9 can be installed on the large gear or integrated into the large gear. The large gear and the small gear are centered by gear shaft 2 and connected by rivets. The centrifugal ventilator 9 is connected to the large gear by interference fit. The function of the centrifugal ventilator 9 can also be integrated into the large gear to avoid excessive air pressure in the gear housing 1. By integrating the centrifugal ventilator 9 through the compound idler gear, the appropriate speed required for centrifugal ventilation is provided, and the center distance can be increased to facilitate the layout of various accessories and provide sufficient maintenance and operation space.

[0057] In this embodiment, the gearbox assembly further includes an adjustment component 3 disposed on the gear shaft 2. The adjustment component 3 includes at least one type of annular adjustment shim. The adjustment component 3 is used to match the actual value of the dimensional chain of the gear shaft 2 with the design value. In this embodiment, the adjustment component 3 is an adjustment shim with a combination of various specifications. Each gear shaft 2 is provided with an adjustment shim to control the axial movement of the gear shaft 2, which is generally controlled to be 0.15 to 0.4 mm. The adjustment shims are grouped, generally 0.2 mm, 0.3 mm, 0.4 mm or other combinations. The adjustment shims are selected and combined according to the dimensional chain calculation result and the measured value of the gear shaft 2 to ensure full tooth width meshing and obtain the required axial movement at a relatively low cost, which has good economic applicability.

[0058] Furthermore, the gearbox assembly also includes a bearing baffle 7 mounted on the bearing bracket 4. The bearing baffle 7 is used to axially limit the second bearing mounted on the bearing bracket 4. The bearing baffle 7 is provided with mounting lugs, and each second bearing seat hole 41 is provided with a threaded hole for mounting the bearing baffle 7. The bearing baffle 7 can withstand a certain axial force. It is simple to process and easy to disassemble and assemble. Together with the adjustment component 3, it realizes the control of the axial movement of the gear shaft 2, avoiding the problems of high axial dimension accuracy requirements and large weight of bearing end caps caused by the use of bearing end caps. It further simplifies the structure and reduces the axial length of the gearbox assembly.

[0059] Furthermore, to prevent rotation of the bearing outer ring, a semi-cylindrical groove 101 is provided on the bearing outer ring, and a cylindrical pin 8 is designed on the casing to cooperate with it for anti-rotation, which can effectively reduce the weight of the bearing and bearing housing. Figure 7 and Figure 8 As shown, the cylindrical pin 8 and the bearing housing hole adopt an interference fit. The setting position and angular position of the cylindrical pin 8 need to take into account the bearing force.

[0060] On the other hand, this embodiment also provides a method for manufacturing a gearbox assembly, used to manufacture the aforementioned gearbox assembly, the manufacturing method comprising:

[0061] S1. Manufacturing of the casing model, implemented according to existing technology, including casting four bearing brackets or forging four bearing brackets, implemented according to existing technology;

[0062] S2. The bearing bracket 4 is positioned and fixed at a preset position on the mating surface of the gear housing assembly; so that the position to be processed of the bearing bracket 4 matches the position to be processed of the gear housing 1.

[0063] S3. The bearing bracket 4 and the housing assembly are machined together to simultaneously form the first bearing seat hole 11 and the second bearing seat hole 41, and simultaneously form the first positioning hole and the second positioning hole 42.

[0064] Based on the use of the same bearings at both ends of a gear shaft 2, the bearing bracket 4 and the housing assembly are machined together. The position and parallelism of the first bearing seat hole 11 and the second bearing seat hole 41 are consistent, and the positioning holes of the two are consistent, which greatly improves the coaxiality of the bearings at both ends of the gear shaft 2, improves the machining accuracy and reduces the machining cost.

[0065] S4. Assembly;

[0066] Specifically, disassemble the bearing bracket 4 installed on the gear housing 1, install the gear shaft 2 and the gear pair. The bearings at both ends of the gear shaft 2 are of the same size and are interference-fitted with the inner ring of the gear shaft 2. The outer ring of the bearing is fitted with the bearing seat hole with a small clearance to ensure easy installation. Adjust the meshing relationship of the gear shaft 2 and install it into the bearing seat hole of the housing, and then cover it with the bearing bracket 4.

[0067] In simple spur gear pairs, there is no axial force, or even if there is slight misalignment at both ends of gear shaft 2, the resulting axial force is small. Therefore, cylindrical roller bearings or deep groove ball bearings without mounting flanges are generally installed, and the bearings at both ends of gear shaft 2 are of the same type.

[0068] This gearbox assembly is simple to manufacture, has low manufacturing cost, and high efficiency. It requires no special processing technology, which reduces processing costs. The assembly process is further simplified compared to existing aero-engine gearbox assemblies. It is not sensitive to assembly and inspection requirements, and is convenient to use and maintain. The resulting gearbox assembly achieves high power transmission with a relatively small weight, thus improving power density.

[0069] On the other hand, this embodiment also provides an aircraft engine that uses the above-mentioned gearbox assembly.

[0070] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A gearbox assembly, used in an aero engine, characterized in that, include: A housing assembly for use as a support, the housing assembly having a first bearing seat hole (11) and a first positioning hole located on the same side; Gear pairs are used for power transmission; Gear shaft (2) is used to install a gear pair. The first end of the gear shaft (2) is rotatably mounted in the first bearing seat hole (11) via a bearing. The bearing bracket (4) is in the shape of a thin-walled plate and is installed on the housing assembly. The bearing bracket (4) is provided with a second bearing seat hole (41) that matches the position of the first bearing seat hole (11) and a second positioning hole (42) that matches the position of the first positioning hole. The second end of the gear shaft (2) is rotatably installed in the second bearing seat hole (41) through a bearing.

2. The gearbox assembly according to claim 1, characterized in that, The casing assembly includes a gear casing (1) with a length matching that of the gear shaft (2), and a core bearing casing (6) connected to the gear casing (1); the inner cavity of the core bearing casing (6) is in communication with the inner cavity of the gear casing (1).

3. The gearbox assembly according to claim 2, characterized in that, The casing assembly also includes an oil tank (12) disposed in the gear casing (1) and located below the gear pair. The bearing mounting position of the core machine bearing casing (6) smoothly transitions to the connection position with the gear casing (1). Any position of the inner wall of the core machine bearing casing (6) is higher than the oil tank (12).

4. The gearbox assembly according to claim 2, characterized in that, The gear pair includes an input gear mounted on a gear shaft (2) and an additional gear mounted on another gear shaft (2). The input gear is driven to connect with the additional gear. The gearbox assembly also includes an elastic shaft (5). The input gear is provided with an internal spline. The first end of the elastic shaft (5) is provided with an external spline that matches the internal spline of the input gear. The second end of the elastic shaft (5) is used to connect with the rotor of the core machine.

5. The gearbox assembly according to claim 4, characterized in that, The gear pair also includes a compound idler gear, which includes a large gear and a small gear connected coaxially, and a centrifugal ventilator (9) connected to the large gear. The compound idler gear meshes with the input gear and the additional gear respectively.

6. The gearbox assembly according to claim 1, characterized in that, The gearbox assembly also includes an adjustment component (3) disposed on the gear shaft (2). The adjustment component (3) includes at least one annular adjustment pad of at least one specification. The adjustment component (3) is used to match the actual value of the dimensional chain of the gear shaft (2) with the design value.

7. The gearbox assembly according to claim 1, characterized in that, The gearbox assembly also includes a bearing baffle (7) mounted on the bearing bracket (4), the bearing baffle (7) being used to axially limit the second bearing mounted on the bearing bracket (4).

8. The gearbox assembly according to any one of claims 1-7, characterized in that, The span of the bearing installed on one side of the casing assembly is smaller than the span of the bearing installed on one side of the bearing bracket (4) to reduce the force on the bearing installed on one side of the bearing bracket (4).

9. A method for manufacturing a gearbox assembly, characterized in that, The manufacturing method for the gearbox assembly according to any one of claims 1-8 comprises: Manufacturing of bearing housings, including casting or forging bearing housing components; The bearing bracket workpiece is positioned and fixed at a preset position on the mating surface of the housing assembly; The bearing bracket and casing assembly are machined together so that the first bearing seat hole and the second bearing seat hole are formed simultaneously, and the first positioning hole and the second positioning hole are machined simultaneously.

10. An aircraft engine, characterized in that, The application has the gearbox assembly as described in any one of claims 1-8.

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