Engine gearbox and aero-engine with same

Abstract

The invention relates to the technical field of aero-engines, in particular to an engine gearbox and an aero-engine with the same. The engine gearbox comprises a gearbox body, a power output shaft assembly is integrally installed in the gearbox body, the input end of the power output shaft assembly is suitable for being in transmission fit with an engine body, the output end of the power output shaft assembly is suitable for being in transmission fit with a load mechanism, and a central gear is installed on the power output shaft assembly. And the accessory transmission gear assembly is in meshing transmission fit with the central gear, and the accessory transmission gear assembly is suitable for being in transmission fit with an accessory mechanism. The load mechanism and the power turbine rotor of the engine body can synchronously rotate at a high speed, meanwhile, part of power is transmitted to the accessory mechanism through the accessory transmission gear assembly through the central gear, and the power turbine rotor can drive the accessory mechanism to operate at respective appropriate rotating speeds after the rotating speed of the power turbine rotor is changed through the gear.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of aero-engine, in particular to an engine gear box and an aero-engine with the same. BACKGROUND

[0002] The aero-engine generally has an accessory drive gear box and a reducer gear box, which respectively realize the accessory drive function and the engine power output function. The accessory drive function refers to that the accessory drive gear box extracts a small amount of power from the gas turbine rotor of the aero-engine to drive the oil pump, fuel pump and the like of the engine to realize the fuel and oil delivery of the engine, otherwise the engine cannot run due to lack of fuel or be damaged due to lack of lubrication. The reducer gear box is installed on the aircraft, and extracts almost all the power from the power turbine rotor of the aero-engine through a separate gear train according to a certain transmission ratio and steering requirement to drive the rotors, propellers, generators and the like on the aircraft.

[0003] With the development of high-speed motor and high-speed gas supply unit technology, the output speed of the engine needs to be high enough so that the power turbine can be directly connected with the high-speed motor or high-speed gas supply unit. For the high-speed motor, especially the high-speed gas supply unit, the speed can reach more than 50000r / min. Even if the speed of the engine power turbine rotor reaches the speed requirement, the existing technology does not have the function of directly connecting the engine load with the power turbine, and the power output speed is relatively low. In particular, when the accessory drive gear box and the reducer gear box are integrated, the output speed of the reducer is only a few thousand revolutions per minute, which cannot meet the speed requirement of the high-speed motor. If the speed of the gear box in the existing technology is forcibly increased to more than 50000r / min, since the gear box in the existing technology does not consider the high-speed condition of the output shaft, it may be damaged due to resonance when used under the high-speed condition of the output shaft. SUMMARY

[0004] Therefore, the present application provides an engine gear box and an aero-engine with the same to solve the problem that the gear box in the existing technology cannot meet the current high-speed requirement.

[0005] In a first aspect, the present application provides an engine gear box, which comprises a gear box body, and a power output shaft assembly, an accessory drive gear assembly and a reducer gear assembly are integrally installed in the gear box body.

[0006] The input end of the power output shaft assembly is adapted to be in transmission cooperation with the engine body, and the output end thereof is adapted to be in transmission cooperation with a load mechanism. A central gear is installed on the power output shaft assembly.

[0007] The accessory drive gear assembly is in meshing transmission cooperation with the central gear, and is adapted to be in transmission cooperation with an accessory mechanism.

[0008] The engine gear box is used for being mounted on an aero-engine, and utilizes a set of integrated engine gear boxes to simultaneously drive load mechanisms such as rotors, propellers, generators and accessory mechanisms such as oil pumps and fuel pumps. The gear box body realizes double-function collaborative work through an integrated power output shaft assembly and an accessory transmission gear assembly. The power of the engine body is transmitted into the power output shaft assembly through the input end, and finally transmitted to the load mechanism through the output end. At the same time, the power output shaft assembly drives the central gear to rotate, and the central gear synchronously drives the accessory transmission gear assembly to transmit part of the power to the accessory mechanism, thereby maintaining the basic function of the engine. The power output shaft assembly and the accessory transmission gear assembly are integrated and installed in the same gear box body to realize synchronous operation, realize the double functions of transmitting engine power to the load and accessory transmission, do not affect the accessory transmission function, can realize the function of directly connecting the power turbine rotor power to the aircraft load mechanism, and further enable the load mechanism to rotate at a high speed synchronously with the power turbine rotor of the engine body. At the same time, part of the power of the power turbine rotor is transmitted to the accessory mechanism through the accessory transmission gear assembly through the central gear, so that the rotating speed of the power turbine rotor can drive the accessory mechanism to operate at a suitable rotating speed.

[0009] In an alternative embodiment, the power output shaft assembly comprises:

[0010] A power input shaft, one end of which is adapted to be in driving connection with the rotor of the engine body, and the other end of which is adapted to be in driving connection with the transmission shaft of the load mechanism;

[0011] A bearing seat fixedly formed in the interior of the gear box body, the power input shaft being rotatably installed on the bearing seat, and a bearing body being installed between the power input shaft and the bearing seat.

[0012] In operation, the power of the engine body is transmitted to the power input shaft through the rotor, and then transmitted to the transmission shaft of the load mechanism through the power input shaft to drive the load mechanism to operate. The bearing seat can provide stable support for the power input shaft, and the bearing body can reduce the friction between the power input shaft and the bearing seat, thereby realizing effective transmission of the engine power to the load mechanism and ensuring the stability and reliability of the transmission process.

[0013] In an alternative embodiment, at least two groups of bearing seats are spaced apart along the axial direction of the power input shaft. The power input shaft is effectively supported at multiple positions, the load borne by the power input shaft is more evenly distributed, the carrying capacity and stability of the entire power output shaft assembly are enhanced, the vibration and deformation of the power input shaft generated during high-speed rotation are reduced, the risk of failure is effectively reduced, and the service life of the gear box is prolonged.

[0014] In an alternative embodiment, an oil collecting ring is installed between the bearing body and the power input shaft, an oil passing channel is arranged in the oil collecting ring, an oil delivery channel is arranged on the bearing body, one end of the oil delivery channel communicates with the oil passing channel, and the other end extends to the bearing roller installation area inside the bearing body. An oil inlet hole is arranged on the side of the oil collecting ring close to the power input shaft, and the oil inlet hole communicates with the oil passing channel. An oil feeding nozzle is arranged towards the oil inlet hole. In operation, the oil is sprayed into the oil inlet hole by the oil feeding nozzle, passes through the oil passing channel and the oil delivery channel, and finally reaches the bearing roller installation area inside the bearing body, achieving lubrication and cooling of the bearing body, and avoiding overheating and failure of the bearing body during high-speed rotation.

[0015] In an alternative embodiment, an oil collecting groove is arranged in the oil collecting ring between the oil inlet hole and the oil passing channel. When the oil is sprayed into the oil inlet hole, it will gather in the oil collecting groove and then uniformly flow to the oil passing channel, enter the oil delivery channel, and finally reach the bearing roller installation area inside the bearing body. The oil collecting groove temporarily stores the oil sprayed by the oil feeding nozzle, buffers the oil scattering caused by high-speed centrifugal force, ensures sufficient oil continuously entering the oil passing channel, avoids interruption of lubrication, and ensures stable supply and uniform distribution of the oil.

[0016] In an alternative embodiment, a connecting shaft is installed on the end of the power output shaft assembly connected with the load mechanism, a plurality of sound wheel teeth are arranged on the connecting shaft in a circumferential direction, a torque and speed sensor is installed in the inner cavity of the gear box body, and the torque and speed sensor is arranged towards the sound wheel teeth. When the connecting shaft rotates, the sound wheel teeth pass through the torque and speed sensor in sequence, and the number of sound wheel teeth passing through per unit time is detected to accurately measure the rotational speed of the connecting shaft. At the same time, when the connecting shaft bears torque, the sound wheel teeth on the connecting shaft will have a small angular displacement relative to the sound wheel teeth on the reference shaft, and this displacement can be reflected in the waveform measured by the torque and speed sensor. According to the relationship between the displacement and the torque, the torque can be measured. The gear box can monitor the rotational speed and torque during transmission in real time, providing data support for the control and management of the engine, and improving the safety of the gear box operation.

[0017] In an alternative embodiment, the accessory drive gear assembly includes a generator drive gear, a fuel pump drive gear, and / or an oil pump drive gear. The generator drive gear drives the generator to operate, providing power for the aircraft; the fuel pump drive gear drives the fuel pump to work, ensuring normal supply of fuel; and the oil pump drive gear drives the oil pump to work, realizing circulation of the lubrication system. The accessory drive gear assembly includes a set of idler gears driven by the central gear, and the set of idler gears engages the generator drive gear, the fuel pump drive gear, and the oil pump drive gear. The central gear simultaneously drives the fuel pump and oil pump gears, ensuring self-supply of oil lubrication for the engine without the need for an external power source.

[0018] In an alternative embodiment, the bearing body is a roller bearing. The bearing body adopts a split roller bearing, the bearing outer ring of which is separately installed in the bearing seat, and the bearing inner ring and the bearing roller are installed as a whole on the power input shaft. The roller bearing has high radial load capacity and rigidity, can stably operate under the working condition of high speed and small load, effectively reduces the vibration and deformation of the power input shaft, and ensures the accuracy and stability of the transmission.

[0019] In a second aspect, the application further provides an aero-engine comprising the engine gearbox. The aero-engine has the same effects as the engine gearbox, and thus will not be described here.

[0020] In an alternative embodiment, the lubricating oil tank is further provided, the oil outlet pipeline and the oil return pipeline of which are both communicated with the lubricating oil pump, the outlet end of the lubricating oil pump is communicated with an oil delivery pipeline, the bearing cavity of the engine body, the load mechanism and the engine gearbox are all connected in parallel on the oil delivery pipeline, and the oil return pipelines of the bearing cavity of the engine body, the load mechanism and the engine gearbox are all communicated with the lubricating oil pump. The lubricating oil tank is connected with the inlet of the lubricating oil pump through the oil outlet pipeline, the outlet end of the lubricating oil pump is communicated with the oil delivery pipeline, the oil delivery pipeline is branched into the bearing cavity oil supply pipeline of the engine body, the gearbox oil supply pipeline and the aircraft load oil supply pipeline in parallel, the bearing cavity oil return pipeline of the engine body, the gearbox oil return pipeline and the aircraft load oil return pipeline are all connected with the oil return port of the lubricating oil pump, and the lubricating oil pump synchronously delivers the pressurized lubricating oil to the bearing cavity of the engine body, the engine gearbox and the aircraft load mechanism through the oil delivery pipeline, and uniformly draws back the lubricated oil return through the respective oil return pipelines by the lubricating oil pump and returns to the lubricating oil tank. The integrated oil circuit system makes the bearing cavity of the engine body, the aircraft load mechanism and the engine gearbox share the same set of lubricating cycle, eliminates the redundant pipelines and cooling units of the independent lubricating system, and reduces the overall weight of the aero power system. BRIEF DESCRIPTION OF DRAWINGS

[0021] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings needed to be used in the specific embodiments or prior art description. Obviously, the drawings described below are some embodiments of the present application, and those skilled in the art can also obtain other drawings according to these drawings without any creative effort.

[0022] Figure 1 The structural schematic diagram of the engine gearbox provided for the embodiments of the present application.

[0023] Figure 2 The assembly schematic diagram of the accessory drive gear assembly provided for the embodiments of the present application.

[0024] Figure 3 The structural schematic diagram of the accessory drive gear assembly provided for the embodiments of the present application.

[0025] Figure 4 The structural schematic diagram of the power output shaft assembly provided by the embodiment of the present application.

[0026] Figure 5 The structural schematic diagram of the bearing body and the power input shaft provided by the embodiment of the present application.

[0027] Figure 6 The structural schematic diagram of the lubrication and cooling structure inside the engine gear box provided by the embodiment of the present application.

[0028] Figure 7 The structural schematic diagram of the connecting shaft provided by the embodiment of the present application.

[0029] Figure 8 The structural schematic diagram of the lubricating oil system of the aero-engine provided by the embodiment of the present application.

[0030] The structural schematic diagram of the lubricating oil system of the aero-engine provided by the embodiment of the present application. DETAILED DESCRIPTION

[0031] To make the purpose, technical scheme and advantages of the embodiments of the present application clearer, the technical scheme in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments in the present application, all the other embodiments obtained by the person skilled in the art without creative labor fall within the protection scope of the present application.

[0032] The embodiments of the present application will be described below with reference to the drawings. Figures 1 to 8 The embodiments of the present application will be described below with reference to the drawings.

[0033] According to an embodiment of the present application, in one aspect, an engine gearbox is provided, comprising a gearbox body 1, a power output shaft assembly 3 and an accessory drive gear assembly 5 are integrally installed inside the gearbox body 1. The input end of the power output shaft assembly 3 is configured to be in driving connection with the power output end of an engine body 38, the output end of the power output shaft assembly 3 is configured to be in driving connection with the power input end of a load mechanism 37, and a central gear 4 is installed in the power output shaft assembly 3. The accessory drive gear assembly 5 is in meshing driving cooperation with the central gear 4, and the output end of the accessory drive gear assembly 5 is configured to be in driving connection with an oil pump 42 and a fuel pump accessory mechanism.

[0034] The engine gearbox is used to be installed on an aero-engine, and a set of integrated engine gearboxes are used to drive a load mechanism 37 such as a rotor, a propeller, a generator and the like and an accessory mechanism such as an oil pump 42, a fuel pump and the like to operate. The gearbox body 1 realizes double-function cooperative work through the integrally installed power output shaft assembly 3 and the accessory drive gear assembly 5. The power of the engine body 38 is transmitted through the input end of the power output shaft assembly 3, and finally transmitted to the load mechanism 37 through the output end, while the power output shaft assembly 3 drives the central gear 4 to rotate, and the central gear 4 synchronously drives the accessory drive gear assembly 5 to transmit part of the power to the accessory mechanism, thereby maintaining the basic function of the engine to operate. The power output shaft assembly 3 and the accessory drive gear assembly 5 are integrally installed in the same gearbox body 1 to synchronously operate, realize the double functions of transmitting the power of the engine to the load and the accessory drive, do not affect the function of the accessory drive, at the same time, realize the function of directly connecting the power turbine rotor 12 to the load mechanism 37, and further enable the load mechanism 37 to synchronously rotate with the power turbine rotor 12 of the engine body 38, thereby realizing synchronous high-speed driving above 50000r / min. At the same time, part of the power is transmitted to the accessory mechanism through the accessory drive gear assembly 5 by the central gear 4, so that the rotating speed of the power turbine rotor 12 can drive the accessory mechanism to operate at a suitable rotating speed. The power output shaft assembly 3 and the accessory drive gear assembly 5 cooperatively work in the space of the gearbox body 1, which not only meets the demand of directly connecting the high-speed load, but also guarantees the independent operation of the accessory drive function, eliminates the structural redundancy of the traditional split gearbox, simplifies the system structure, and reduces the weight of the power system.

[0035] In one embodiment, the power output shaft assembly 3 comprises a power input shaft 16 and a bearing seat 2. The power input shaft 16 is connected to the rotor of the engine body 38 at one end and to the transmission shaft of the load mechanism 37 at the other end; the bearing seat 2 is fixed inside the gear box body 1, the power input shaft 16 is rotatably installed on the bearing seat 2, and a bearing body is installed between the power input shaft 16 and the bearing seat 2. In operation, the power of the engine body 38 is transmitted to the power input shaft 16 through the rotor, and then transmitted to the transmission shaft of the load mechanism 37 through the power input shaft 16, driving the load mechanism 37 to operate. The bearing seat 2 can provide stable support for the power input shaft 16, and the bearing body can reduce the friction between the power input shaft 16 and the bearing seat 2, thereby achieving effective transmission of engine power to the load mechanism 37 and ensuring the stability and reliability of the transmission process.

[0036] In this embodiment, the bearing body is a roller bearing 14, specifically a split roller bearing 14, the bearing outer ring 21 of the roller bearing 14 is separately installed on the bearing seat 2, and the bearing inner ring 22 and the bearing roller 26 are installed as a whole on the power input shaft 16. The roller bearing 14 has high radial load capacity and stiffness, and can operate stably under high speed and small load conditions, effectively reducing the vibration and deformation of the power input shaft 16 and ensuring the accuracy and stability of the transmission.

[0037] Further, the bearing seat 2 is spaced apart in the axial direction of the power input shaft 16 and is provided with at least two groups. The power input shaft 16 is effectively supported at multiple positions, the load on the power input shaft 16 is more evenly distributed, the carrying capacity and stability of the entire power output shaft assembly 3 are enhanced, the vibration and deformation of the power input shaft 16 during high-speed rotation are reduced, the risk of failure is effectively reduced, and the service life of the gear box is prolonged. In this embodiment, the bearing seat 2 is provided with two groups, and two separable high-speed and small-load roller bearings 14 with mounting edges are used to support the same high-speed power input shaft 16, which ensures that the power input shaft 16 does not slip under high speed and small load conditions, and facilitates assembly. At the same time, the rigidity of the rotor can be significantly improved, so that the power input shaft 16 can operate stably at a speed of more than 50,000 r / min.

[0038] In one embodiment, an oil collecting ring 15 is mounted between the bearing body and the power input shaft 16, the oil collecting ring 15 is interference fitted on the power input shaft 16, an oil passing channel 28 is arranged axially in the oil collecting ring 15, an oil delivery channel 29 is arranged on the bearing body, one end of the oil delivery channel 29 communicates with the oil passing channel 28, and the other end extends to the bearing roller 26 mounting area inside the bearing body, so that the lubricating oil is delivered to the space between the bearing roller 26 and the bearing inner ring 22, an oil inlet hole is arranged on the side of the oil collecting ring 15 close to the power input shaft 16, the oil inlet hole communicates with the oil passing channel 28, and an oil delivery nozzle 27 is arranged towards the oil inlet hole. In operation, the lubricating oil is sprayed into the oil inlet hole by the oil delivery nozzle 27, passes through the oil passing channel 28 and the oil delivery channel 29, and finally reaches the bearing roller 26 mounting area inside the bearing body, realizing lubrication and cooling of the bearing body, and avoiding overheating and failure of the bearing body during high-speed rotation. In some other embodiments, the oil collecting ring 15 can be omitted, so that the oil delivery nozzle 27 directly sprays lubricating oil towards the bearing body for lubrication.

[0039] In the present embodiment, an annular oil collecting groove 30 is arranged in the oil collecting ring 15, and the oil collecting groove 30 is arranged between the oil inlet hole and the oil passing channel 28. When the lubricating oil is sprayed into the oil inlet hole, it will gather in the oil collecting groove 30 and then flow uniformly to the oil passing channel 28, enter the oil delivery channel 29, and finally reach the bearing roller 26 mounting area inside the bearing body. The oil collecting groove 30 temporarily stores the lubricating oil sprayed by the oil delivery nozzle 27, buffers the high-speed centrifugal force, and prevents the oil from flying. It ensures that a sufficient amount of lubricating oil continuously enters the oil passing channel 28, avoids interruption of lubrication, and ensures stable supply and uniform distribution of lubricating oil.

[0040] In one embodiment, the power output shaft assembly 3 is connected to the load mechanism 37 at one end, and a connecting shaft 19 is arranged on the power output shaft assembly 3, a plurality of sound wheel teeth 34 are arranged on the connecting shaft 19 at intervals in the circumferential direction, a torque and speed sensor 35 is arranged in the inner cavity of the gear box body 1, and the torque and speed sensor 35 is arranged towards the sound wheel teeth 34. When the connecting shaft 19 rotates, the sound wheel teeth 34 pass through the torque and speed sensor in sequence, and by detecting the number of sound wheel teeth 34 passing through per unit time, the rotational speed of the connecting shaft 19 can be accurately measured; at the same time, when the connecting shaft 19 bears torque, the sound wheel teeth 34 on the connecting shaft 19 will have a small angular displacement relative to the sound wheel teeth 34 on the reference shaft 18, and this displacement can be reflected in the waveform measured by the torque and speed sensor, and according to the relationship between this displacement and torque, the torque can be measured. This allows the gear box to monitor the rotational speed and torque during transmission in real time, providing data support for the control and management of the engine and improving the safety of the gear box operation.

[0041] In one embodiment, the accessory drive gear assembly 5 includes a generator drive gear 6, a fuel pump drive gear 9 and an oil pump drive gear 11. The generator drive gear 6 drives the generator to operate to provide power for the aircraft; the fuel pump drive gear 9 drives the fuel pump to work to ensure normal supply of fuel; and the oil pump drive gear 11 drives the oil pump 42 to work to realize circulation of the lubricating system. The accessory drive gear assembly 5 includes an idler gear set driven by the central gear 4, which engages the generator drive gear 6, the fuel pump drive gear 9 and the oil pump drive gear 11. The central gear 4 simultaneously drives the fuel pump and the oil pump 42 gears to ensure self-supply of oil lubrication for the engine without the need for an external power source. Specifically, inside the accessory drive gear assembly 5, the central gear 4 engages the first idler gear 7, the first idler gear 7 synchronously engages the second idler gear 8 and the oil pump drive gear 11, the second idler gear 8 engages the generator drive gear 6, the oil pump drive gear 11 on the other side engages the third idler gear 10, and the third idler gear 10 engages the fuel pump drive gear 9.

[0042] The high-speed direct connection type power output and power extraction engine gear box provided in the embodiment is connected to the load mechanism 37 of the aircraft at one end and to the engine body 38 at the other end. The engine gear box includes a power output shaft assembly 3, an accessory drive gear assembly 5 and a gear box body 1. The accessory drive gear assembly 5 is installed inside the gear box body 1, and the power of the accessory drive gear assembly 5 comes from the central gear 4. The accessory drive gear assembly 5 drives the engine oil pump 42, the fuel pump and other accessory structures installed outside the gear box body 1 in sequence through engagement with the central gear 4, thus realizing the function of accessory drive. According to the foregoing, the power output shaft assembly 3 is also inside the gear box, that is, one gear box realizes both the function of accessory drive and the function of direct connection of the aircraft load and the engine power turbine rotor 12.

[0043] The power output shaft assembly 3 comprises a power input shaft 16, a locking nut 17, a roller bearing 14, a bearing seat 2, a connecting shaft 19, a reference shaft 18 and a positioning pin 31. The power input shaft 16 is hollow, and one end of the power input shaft 16 is fixedly connected with the power turbine rotor 12 of the engine body 38, and the other end is fixedly connected with the connecting shaft 19. The central gear 4 is fixedly installed on the power turbine rotor 12 extending into the inside of the gear box body 1. The power input shaft 16 is fixedly connected to the power turbine rotor 12 through a centering conical surface 23, a centering cylindrical surface 25 and a spline 24. A limiting block is arranged in the inner cavity of the power input shaft 16. After the power turbine rotor 12 penetrates through the limiting block, the power turbine rotor 12 is locked with the locking nut 17, which not only ensures the transmission of torque, but also ensures the concentricity of the power input shaft 16 and the power turbine rotor 12, avoiding the axial relative displacement of the power input shaft 16 and the power turbine rotor 12 when rotating at high speed. Since the power input shaft 16 theoretically does not bear radial force and axial force, two roller bearings 14 with mounting edges are used for supporting. The roller bearings 14 can not slip under the working condition of high speed and small load, and the bearing inner ring 22 and the bearing outer ring 21 of the roller bearing 14 can be separately installed, that is, the bearing outer ring 21 of the bearing can be separately taken out and installed on the bearing seat 2, and the bearing inner ring 22 and the bearing roller 26 can be taken out and installed on the power input shaft 16 as a whole, so as to facilitate assembly. The roller bearings 14 are used in pairs to support the power input shaft 16, which can improve the rigidity of the power input shaft 16 and improve the dynamic characteristics of the entire power output shaft assembly 3, so that the power output shaft assembly 3 can stably operate when the rotating speed exceeds 50000r / min.

[0044] The power input shaft 16 is equipped with an oil collecting ring 15, which can lubricate the roller bearing 14 while connecting the inner ring of the roller bearing 14. The oil jetted by one of the oil jets 27 is used to cool the roller bearing 14 near the power turbine rotor 12. The oil jetted by the oil jet 27 is gathered in the oil collecting groove 30 on the oil collecting ring 15 under the action of the centrifugal force and the oil dam 45 formed at the oil inlet hole of the oil collecting ring 15, and then enters the oil collecting cavity through the oil passage 28 on the oil collecting ring 15, and flows to the space between the bearing rollers 26 and the inner ring 22 of the roller bearing 14 under the action of the centrifugal force, thereby lubricating and cooling the roller bearing 14. The oil collecting ring 15 is connected to the power input shaft 16 by interference fit and shoulder structure. In order to prevent the oil collecting ring 15 from being axially separated, the positioning pin 31 is used for axial positioning, and the positioning pin 31 will not be separated under the action of the centrifugal force due to the limitation of the oil collecting ring 15 and the positioning nut 13. The lubrication mode of the roller bearing 14 near the connecting shaft 19 is similar. The oil jetted by the other oil jet 27 is gathered in the oil collecting groove 30 on the locking nut 17 under the action of the centrifugal force and the oil dam 45 formed at the oil inlet hole of the oil collecting ring 15, and then enters the oil collecting cavity through the oil passage 28, and flows to the space between the rollers and the inner ring 22 of the roller bearing 14 under the action of the centrifugal force, thereby lubricating and cooling the roller bearing 14. The oil jet 27 is provided with two oil injection ports, and the other oil injection port is arranged towards the oil inlet between the end of the power input shaft 16 and the connecting shaft 19. The oil jetted by the oil jet 27 can lubricate the spline 24 of the connecting shaft 19 when flowing through the spline 24, and then lubricate the spline 24 of the power turbine rotor 12 in sequence after flowing through the oil collecting space 48, the oil passage 47 and the lubricating space 46 in the inner cavity of the power input shaft 16. The oil inlet hole 32 is designed on the power input shaft 16 and the oil collecting ring 15. The oil flowing through the spline 24 of the power turbine rotor 12 is thrown out through the oil inlet hole 32 under the action of the centrifugal force, thereby preventing oil accumulation.

[0045] The spline 24 at one end of the connecting shaft 19 is inserted into the inner spline 24 of the power input shaft 16, and the spline 24 at the other end is inserted into the inner spline 24 of the transmission shaft of the gas supply unit or high-speed motor load to realize torque transmission. Both of the splines 24 of the connecting shaft 19 are tooth direction modified and adopt the matching mode of tooth side centering, so that the concentricity is ensured, and the uniformity of the load distribution of the spline 24 is ensured. Axial stop steps are designed at both ends of the connecting shaft 19 to prevent the transitional movement of the connecting shaft 19, and a certain axial gap is left to prevent the over-constraint of the connecting shaft 19 during work, thereby causing harmful internal stress and deformation. The sound wheel teeth 34 are uniformly distributed in the circumferential direction on the connecting shaft 19 and the reference shaft 18, and the torque and speed sensor installed on the gear box body 1 can measure the speed of the shafting according to the number of sound wheel teeth 34 turned in unit time. When the connecting shaft 19 bears torque, the sound wheel teeth 34 thereon have a small angular displacement relative to the sound wheel teeth 34 on the reference shaft 18, and this displacement can be reflected on the waveform measured by the torque and speed sensor. According to the relationship between this displacement and torque, the measurement of torque can be realized. The reference shaft 18 is connected with the connecting shaft 19 through the limiting pin 20, and in order to ensure the concentricity of the reference shaft 18 and the connecting shaft 19, the reference shaft 18 is designed with two precisely matched cylindrical surfaces 36. The spline 24 is lubricated by the oil injected by the oil injection nozzle 27 integrated on the gear box body 1, and the oil throw hole 32 is also designed on the load transmission shaft 33. The oil flowing through the spline 24 at one end of the connecting shaft 19 in the transmission shaft is thrown out through the oil throw hole 32 under the action of centrifugal force, preventing the accumulation of oil.

[0046] In a second aspect, the present application further provides an aero-engine comprising the engine gear box, further comprising a lubricating oil tank 39, an oil outlet pipeline 40 and an oil return pipeline 41 both of which are communicated with a lubricating oil pump 42, an oil delivery pipeline 43 is communicated with an outlet end of the lubricating oil pump 42, a filter 44 is installed on the oil delivery pipeline 43, a bearing cavity of the engine body 38, the load mechanism 37 and the engine gear box are all connected in parallel on the oil delivery pipeline 43, and the bearing cavity of the engine body 38, the load mechanism 37 and the engine gear box are all communicated with the lubricating oil pump 42. The lubricating oil tank 39 is connected with the lubricating oil pump 42 through the oil outlet pipeline 40, the outlet end of the lubricating oil pump 42 is communicated with the oil delivery pipeline 43, the oil delivery pipeline 43 is branched into an oil supply pipeline of the bearing cavity of the engine body 38, an oil supply pipeline of the gear box and an oil supply pipeline of the aircraft load mechanism 37, the bearing cavity of the engine body 38, the gear box and the aircraft load mechanism 37 are all communicated with the oil return pipeline of the lubricating oil pump 42, and the lubricating oil pump 42 synchronously delivers the pressurized lubricating oil to the bearing cavity of the engine body 38, the engine gear box and the aircraft load mechanism 37 through the oil delivery pipeline 43, the returned oil after lubrication is uniformly pumped back by the lubricating oil pump 42 through the respective oil return pipelines, all the pumped back lubricating oil flows through the radiator for heat dissipation through the pipeline, and finally returns to the lubricating oil tank 39. The integrated oil circuit system makes the bearing cavity of the engine body 38, the aircraft load mechanism 37 and the engine gear box share the same set of lubricating cycle, eliminates the redundant pipelines and cooling units of the independent lubricating system, and reduces the overall weight of the aero power system.

[0047] Although the embodiments of the present application are described in conjunction with the drawings, various modifications and changes can be made by those skilled in the art without departing from the spirit and scope of the present application, and such modifications and changes fall within the scope defined by the appended claims.

Claims

1. An engine gearbox, characterized in that, Including the gearbox body (1), which internally integrates and installs: A power output shaft assembly (3) has an input end adapted to drive the engine body (38) and an output end adapted to drive the load mechanism (37). A central gear (4) is mounted on the power output shaft assembly (3). The accessory transmission gear assembly (5) meshes with the central gear (4) and is adapted to be in transmission cooperation with the accessory mechanism.

2. The engine gearbox according to claim 1, characterized in that, The power output shaft assembly (3) includes: The power input shaft (16) has one end adapted to be connected to the rotor of the engine body (38) and the other end adapted to be connected to the drive shaft of the load mechanism (37). The bearing housing (2) is fixedly formed inside the gearbox body (1), the power input shaft (16) is rotatably mounted on the bearing housing (2), and the bearing body is installed between the power input shaft (16) and the bearing housing (2).

3. The engine gearbox according to claim 2, characterized in that, The bearing housing (2) is provided in at least two sets at intervals along the axial direction of the power input shaft (16).

4. The engine gearbox according to claim 2 or 3, characterized in that, An oil collecting ring (15) is installed between the bearing body and the power input shaft (16). An oil passage (28) is provided inside the oil collecting ring (15). An oil supply channel (29) is provided on the bearing body. One end of the oil supply channel (29) is connected to the oil passage (28), and the other end extends to the bearing roller (26) mounting area inside the bearing body. An oil inlet hole is provided on the side of the oil collecting ring (15) near the power input shaft (16). The oil inlet hole is connected to the oil passage (28). It also includes an oil delivery nozzle (27) which is disposed toward the oil inlet.

5. The engine gearbox according to claim 4, characterized in that, An oil collection groove (30) is provided inside the oil collection ring (15), and the oil collection groove (30) is located between the oil inlet and the oil passage (28).

6. The engine gearbox according to any one of claims 1 to 3, characterized in that, The power output shaft assembly (3) is connected to the load mechanism (37) at one end, and a connecting shaft (19) is installed thereon. Multiple tone gear teeth (34) are arranged circumferentially on the connecting shaft (19). A torque speed sensor is installed in the inner cavity of the gearbox body (1), and the torque speed sensor (35) is arranged facing the tone gear teeth (34).

7. The engine gearbox according to any one of claims 1 to 3, characterized in that, The accessory transmission gear assembly (5) includes a generator drive gear (6), a fuel pump drive gear (9), and / or an oil pump drive gear (11).

8. The engine gearbox according to claim 2 or 3, characterized in that, The bearing body is a roller bearing (14).

9. An aircraft engine, characterized in that, Includes the engine gearbox as described in any one of claims 1 to 8.

10. The aero-engine according to claim 9, characterized in that, It also includes an oil tank (39), whose oil outlet line (40) and oil return line (41) are both connected to the oil pump (42). The outlet end of the oil pump (42) is connected to an oil supply line (43). The bearing cavity of the engine body (38), the load mechanism (37) and the engine gearbox are all connected in parallel to the oil supply line (43). The bearing cavity of the engine body (38), the load mechanism (37) and the oil return line of the engine gearbox are all connected to the oil pump (42).

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