Gas turbine engine and gear transmission system thereof

Abstract

The invention aims to provide a gas turbine engine and a gear transmission system thereof. The gear transmission system comprises a power input assembly, a bevel gear transmission chain and a plurality of output driven bevel gears. The power input assembly comprises an input driving bevel gear, the bevel gear transmission chain comprises a transmission shaft, an input driven bevel gear arranged on the periphery of the transmission shaft in a sleeving mode and a plurality of output driving bevel gears, the input driven bevel gear and the output driving bevel gears are in transmission connection with the transmission shaft, and the input driven bevel gear is meshed with the input driving bevel gear. The output driven bevel gears and the output driving bevel gears are arranged in a one-to-one correspondence mode, each output driven bevel gear is meshed with the corresponding output driving bevel gear, and each output driven bevel gear is in transmission connection with a gas turbine engine accessory through a connecting shaft. The gear transmission system is small in size, light in weight and capable of improving the overall performance of the engine.

Description

Technical Field

[0001] The present invention relates to the field of gas turbine engines, and in particular to a gas turbine engine and a gear transmission system thereof. Background Art

[0002] Gas turbine engines usually include an accessory transmission gearbox, which transmits external power to the engine main shaft to support engine starting when the engine is started; when the engine is working continuously, the accessory transmission gearbox converts the power and speed of the engine main shaft into the power, speed and direction required by the accessories.

[0003] The typical accessory transmission gearbox adopts the cylindrical gear transmission power splitting method, driving two cylindrical gear transmission chains through the input gear, and then transmitting power to the accessories, such as Figure 1 The schematic diagram of the existing accessory transmission gearbox is shown. As shown in the figure, the power of the main shaft 920a of the engine is transmitted to the bevel gear 901 and the bevel gear 902 through the central transmission bevel gear pair 920b, and then the power is transmitted to the cylindrical gear transmission chain in reverse. The cylindrical gear transmission chain includes spur gears 903 to spur gears 910. The power is first input to the spur gear 903 and transmitted to the accessory 911. At the same time, the power is divided into two paths through the spur gear 903, and the power is input from the spur gear 904 and the spur gear 906 respectively. The spur gear 904 inputs the power to the spur gear 905, and the spur gear 905 transmits the power to several accessories 911. The spur gear 906 transmits the power to the spur gears 907 to spur gears 909 and spur gears 910, and the power is transmitted to the accessory 911 through the spur gear 908, and the power is transmitted to the accessory 911 through the spur gear 910.

[0004] However, the applicant has found that the existing accessory transmission gearbox still has the problems of large size and heavy weight, which leads to a decrease in the overall performance of the engine. Summary of the invention

[0005] The object of the present invention is to provide a gear transmission system which is small in size and light in weight and can improve the overall performance of an engine.

[0006] A gear transmission system for achieving the above-mentioned purpose comprises:

[0007] A power input assembly, including an input driving bevel gear;

[0008] A bevel gear transmission chain, comprising a transmission shaft, an input driven bevel gear sleeved on the outer circumference of the transmission shaft, and a plurality of output driving bevel gears sleeved on the outer circumference of the transmission shaft, wherein the input driven bevel gear and each of the output driving bevel gears are respectively connected to the transmission shaft in a transmission manner, the input driven bevel gear and the output driving bevel gear and two adjacent output driving bevel gears are respectively spaced apart by a distance along the axial direction of the transmission shaft, and the input driven bevel gear is meshed with the input driving bevel gear; and

[0009] A plurality of output driven bevel gears are arranged corresponding to the output active bevel gears one by one, each of the output driven bevel gears is respectively meshed with the corresponding output active bevel gear, and each of the output driven bevel gears is drivingly connected to the gas turbine engine accessories through a connecting shaft.

[0010] In one or more embodiments, the input driven bevel gear is disposed at one end of the transmission shaft.

[0011] In one or more embodiments, the output active bevel gear comprises a tail end output active bevel gear disposed at the other end of the transmission shaft;

[0012] Wherein, the gear transmission system also includes a head-end connecting shaft and a tail-end connecting shaft, the input driven bevel gear is transmission-connected to a gas turbine engine accessory arranged at one end of the transmission shaft through the head-end connecting shaft, the tail-end output active bevel gear is transmission-connected to a gas turbine engine accessory arranged at the other end of the transmission shaft through the tail-end connecting shaft, and the head-end connecting shaft and the tail-end connecting shaft are respectively coaxially arranged with the transmission shaft.

[0013] In one or more embodiments, the power input assembly includes a central transmission bevel gear pair, which extracts power from the main shaft of the gas turbine engine and is drivingly connected to the input driving bevel gear.

[0014] In one or more embodiments, the transmission shaft is arranged parallel to the main shaft.

[0015] In one or more embodiments, an outer shell is further included, the bevel gear transmission chain and the plurality of output driven bevel gears are respectively arranged inside the outer shell, and the connecting shaft passes through the shell and is drivingly connected to the gas turbine engine accessories.

[0016] In one or more embodiments, the outer shell is cylindrical, and the rotation axis of the outer shell is parallel to or coaxial with the axial direction of the transmission shaft.

[0017] In one or more embodiments, the gas turbine engine accessories include internal accessories, which are integrally arranged with the connecting shaft and the corresponding output driven bevel gear, the internal accessories are arranged inside the outer casing, and the remaining accessories are arranged outside the outer casing.

[0018] In one or more embodiments, the connecting shaft connects the output driven bevel gear and gas turbine engine accessories on both axial sides of the transmission shaft;

[0019] Wherein, the axes of the multiple connecting shafts located on the same side are located in the same plane.

[0020] On the other hand, according to some embodiments of the present application, a gas turbine engine is provided, which includes the gear transmission system as described above.

[0021] The beneficial effects of the present invention are:

[0022] This gear transmission system uses a transmission chain of full bevel gear pairs. There is no need to arrange additional gears (intermediate gears) to adjust the length of the transmission chain. It only needs to adjust the length of the transmission shaft to prevent multiple accessories with large outer profiles from interfering with each other. At the same time, the transmission chain is very easy to achieve multi-way power diversion. Each power diversion only drives a group of accessories to work independently and is not affected by other power diversions. Multi-way power diversion can reduce the volume of gears and the pitch circle diameter. Therefore, when driving the same number of accessories, the number of gears in the compact accessory transmission gearbox device is less than that of the typical accessory transmission gearbox, thereby reducing the weight of the gearbox. At the same time, the gear transmission system with this configuration can achieve a smaller frontal area than the typical accessory transmission gearbox, providing a basis for improving the overall performance of the engine.

[0023] The above description is only an overview of the technical solution of the present application. In order to more clearly understand the technical means of the present application, it can be implemented in accordance with the contents of the specification. In order to make the above and other purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are listed below. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Various other advantages and benefits will become apparent to those of ordinary skill in the art by reading the detailed description of the preferred embodiments below. The accompanying drawings are only for the purpose of illustrating the preferred embodiments and are not to be considered as limiting the present application. Moreover, the same reference numerals are used throughout the drawings to represent the same components. In the drawings:

[0025] Figure 1 A schematic diagram of a conventional accessory transmission gearbox is shown;

[0026] Figure 2shows a simplified schematic diagram of some embodiments of the gear transmission system;

[0027] Figure 3 A front view schematic diagram of a specific embodiment of the gear transmission system is shown;

[0028] Figure 4 A side schematic diagram of a specific embodiment of the gear transmission system is shown;

[0029] Figure 5 for Figure 4 A schematic cross-sectional view obtained by cutting along the AA direction;

[0030] Figure 6 for Figure 4 The schematic cross-sectional view obtained by cutting along the BB direction. DETAILED DESCRIPTION

[0031] The following embodiments of the technical solution of the present application are described in detail in conjunction with the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present application, and are therefore only used as examples, and cannot be used to limit the scope of protection of the present application.

[0032] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by technicians in the technical field to which this application belongs; the terms used herein are only for the purpose of describing specific embodiments and are not intended to limit this application; the terms "including" and "having" in the specification and claims of this application and the above-mentioned figure descriptions and any variations thereof are intended to cover non-exclusive inclusions.

[0033] For Figure 1The applicant has found that, in the prior art, when the accessory transmission gearbox has a large outer dimension, it is necessary to add an intermediate gear (such as spur gears 903 to 910) between the input gear and the output gear to ensure that the accessories do not interfere with each other, making the internal transmission chain lengthy and complicated. Although when the total power extraction is constant, increasing the number of power split transmission chains can reduce the transmission power of each transmission chain, thus achieving a more reasonable power distribution, thereby reducing the gear size and the weight of the gearbox. However, the increase in power split of the cylindrical gear transmission chain will increase the output gears. The more output gears for power splitting, the larger the windward area of ​​the engine, which limits the number of power splits in the gearbox under the prior art. The cylindrical gear pair is a line contact transmission with limited bearing strength. When the transmission power is high, larger gears need to be arranged to meet the strength requirements, further increasing the volume of the gearbox. The gear shafts in the cylindrical gear transmission chain are parallel to each other, and the gear shafts are parallel to the main shaft of the engine, resulting in the coaxially connected accessories being arranged parallel to each other on both sides of the accessory gearbox. The more accessories there are, the longer the transmission chain is. This accessory layout fails to fully utilize the surrounding space of the gearbox, and the larger the windward area. In summary, the accessory transmission gearbox under the existing technology is large in size and weight, especially increasing the windward area of ​​the aircraft engine, resulting in a decrease in the overall performance of the engine.

[0034] In order to solve the above problems, on the one hand, according to some embodiments of the present application, a gear transmission system is provided. Figure 2 Simplified schematic diagrams of some embodiments of the gear transmission system according to the present invention are shown.

[0035] As shown in the figure, the gear transmission system includes a power input assembly 1, a bevel gear transmission chain 2, and a plurality of output driven bevel gears 3. The power input assembly 1 includes an input active bevel gear 10, and the bevel gear transmission chain 2 includes a transmission shaft 20, an input driven bevel gear 21 sleeved on the outer periphery of the transmission shaft 20, and a plurality of output active bevel gears 22 sleeved on the outer periphery of the transmission shaft 20. The input driven bevel gear 21 and each output active bevel gear 22 are respectively connected to the transmission shaft 20 by transmission. In some specific embodiments, the input driven bevel gear 21 and / or the output active bevel gear 22 are connected to the transmission shaft 20 by splines. A distance is spaced between the input driven bevel gear 21 and the output active bevel gear 22 along the axial direction of the transmission shaft 20, and a distance is also spaced between two adjacent output active bevel gears 22 along the axial direction of the transmission shaft 20, so as to ensure that the input driven bevel gear 21 and the output active bevel gear 22 do not interfere with each other when actuated. The input driven bevel gear 21 meshes with the input active bevel gear 10 to enable the bevel gear transmission chain 2 to extract power from the power input assembly 1. It can be understood that the axial direction of the transmission shaft 20 is the direction of the central axial direction of the transmission shaft.

[0036] Multiple output driven bevel gears 3 are arranged in one-to-one correspondence with the output driving bevel gear 22, each output driven bevel gear 3 is respectively meshed with the corresponding output driving bevel gear 22, and each output driven bevel gear 3 is transmission-connected to the gas turbine engine accessory 5 through the connecting shaft 4, so that when the bevel gear transmission chain 2 is actuated, the gas turbine engine accessory 5 can be driven to actuate through the multiple output driven bevel gears 3.

[0037] The gear transmission system adopts a transmission chain of full bevel gear pairs. It is not necessary to arrange additional gears (intermediate gears) to adjust the length of the transmission chain. It is only necessary to adjust the length of the transmission shaft 20 so that multiple accessories with large outer profiles do not interfere with each other. Therefore, when driving the same number of accessories, the number of gears of the compact accessory transmission gearbox device is less than that of the typical accessory transmission gearbox, thereby reducing the weight of the gearbox.

[0038] Reference to "embodiments" herein means that a particular feature, structure, or characteristic described in conjunction with the embodiments may be included in at least one embodiment of the present application. The appearance of the phrase in various locations in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0039] In the description of the embodiments of the present application, “plurality” means more than two, unless otherwise clearly and specifically defined.

[0040] In some embodiments of the gear transmission system, as shown in the figure, the input driven bevel gear 21 is arranged at one end of the transmission shaft 20. By arranging the input driven bevel gear 21 at the end of the transmission shaft 20, it is possible to avoid the accessories of the gas turbine engine in the open space at the end, so that the accessories with multiple transmission connections to the rear of one end of the transmission shaft 20 can be arranged more compactly.

[0041] In some embodiments of the present gear transmission system, the output active bevel gear 22 includes a tail end output active bevel gear 22a disposed at the other end of the transmission shaft 20, that is, the tail end output active bevel gear 22a and the input driven bevel gear 21 are disposed at both ends of the transmission shaft 20. The gear transmission system further includes a head end connecting shaft 61 and a tail end connecting shaft 62, the input driven bevel gear 21 is transmission-connected to the gas turbine engine accessory 5 disposed at one end of the transmission shaft 20 through the head end connecting shaft 61, the tail end output active bevel gear 22a is transmission-connected to the gas turbine engine accessory 5 disposed at the other end of the transmission shaft 20 through the tail end connecting shaft 62, and the head end connecting shaft 61 and the tail end connecting shaft 62 are respectively disposed coaxially with the transmission shaft 20. In some specific embodiments, the head end connecting shaft 61 and / or the tail end connecting shaft 62 can be disposed as one body with the transmission shaft 20 or can be transmission-connected to the transmission shaft 20 through components such as couplings.

[0042] In a specific embodiment, the axis of the output active bevel gear 22 intersects or staggers with the axis of the output driven bevel gear 3 at an angle. When the output active bevel gear 22 is meshed with multiple output driven bevel gears 3, the rotational intersection angles or staggered angles of the output active bevel gear 22 and different output driven bevel gears 3 may be unequal, so as to realize transmission connection of accessories 5 arranged at different positions. The gear axis described in the text can be understood as the rotation axis of the gear when it rotates.

[0043] In some embodiments of the gear transmission system, the power input assembly includes a central transmission bevel gear pair 7, which extracts power from the main shaft 8 of the gas turbine engine and is in transmission connection with the input active bevel gear 10. Specifically, the central transmission bevel gear pair 7 may include a first bevel gear 71 and a second bevel gear 72 that are meshed with each other, the first bevel gear 71 is in transmission connection with the main shaft 8, for example, it is arranged on the main shaft 8 with an interference fit, and the second bevel gear 72 is in transmission connection with the input active bevel gear 10 through, for example, a transmission rod 73, and the input active bevel gear 10 and the transmission rod 73 may be connected through, for example, a spline fit. The transmission rod 73 intersects the main shaft 8 at a certain angle. The gear transmission system of this configuration has power derived from the main shaft 8 of the gas turbine engine. The central transmission bevel gear pair 7 of the gas turbine engine transmits power to the outside. The input active bevel gear 10 extracts power and transmits it to the input driven bevel gear 21; the input driven bevel gear 21 transmits power to the transmission shaft 20; the transmission shaft 20 transmits power to the output active bevel gear 22; the output active bevel gear 22 transmits power to the output driven bevel gear 3; the output driven bevel gear 3 transmits power to the accessory 5 connected thereto. The input driven bevel gear 21 at the end of the transmission shaft 20 transmits power to the accessory 5 connected thereto; the tail end output active bevel gear 22a transmits power to the accessory 5 connected thereto.

[0044] In some embodiments of the present gear transmission system, the transmission shaft 20 is arranged parallel to the main shaft 8. By arranging the transmission shaft 20 of the transmission chain parallel to the main shaft 8 of the engine, the axial projection area of ​​the gearbox is determined by the output bevel gear assembly with the largest axial projection area. Once the output bevel gear assembly with the largest axial projection area is determined, the axial projection area of ​​the gearbox will not increase as the number of output bevel gear assemblies increases. Therefore, the device can achieve a smaller frontal area than a typical accessory transmission gearbox, providing a basis for improving the overall performance of the engine. In some other embodiments different from those shown in the figure, the transmission shaft 20 can also be configured to be staggered with the main shaft 8.

[0045] In some embodiments of the gear transmission system, the gear transmission system also includes an outer shell 100, a bevel gear transmission chain 2 and a plurality of output driven bevel gears 3 are respectively arranged inside the outer shell 100, and a connecting shaft 4 passes through the shell 100 and is transmission-connected to a gas turbine engine accessory 5.

[0046] In some embodiments of the present gear transmission system, the outer shell 100 is cylindrical, and the rotation axis of the outer shell 100 is parallel to or coaxial with the axial direction of the transmission shaft 20, so as to achieve a more compact arrangement of the internal components of the outer shell 100.

[0047] In some embodiments of the present gear transmission system, the gas turbine engine accessories 5 include internal accessories, which are integrally arranged with the connecting shaft 20 and the corresponding output driven bevel gear 3, and the internal accessories are arranged inside the outer shell 100, and the remaining accessories are arranged outside the outer shell 100. In other embodiments, the gas turbine engine accessories 5 may also include accessories integrated with the output active bevel gear 22, for example, the accessories 5 are directly integrated and arranged on the output active bevel gear 22. In some specific embodiments, the types of accessories 5 arranged outside the outer shell 100 include but are not limited to generators, generators, fuel pumps, lubricating oil pumps, and oil-gas separators, the types of accessories 5 arranged inside the outer shell 100 and integrally arranged with the output driven bevel gear 3 include but are not limited to oil-gas separators and speed measuring sound wheels, and the types of accessories 5 arranged inside the outer shell 100 and integrated on the output active bevel gear 22 include but are not limited to oil-gas separators and speed measuring sound wheels.

[0048] In some embodiments of the gear transmission system, the connecting shaft 4 connects the output driven bevel gear 3 and the gas turbine engine accessory 5 on both axial sides of the transmission shaft 20, wherein the axes of the multiple connecting shafts 4 located on the same side are located in the same plane. In this arrangement, the axial projection area of ​​the accessories 5 at the head and tail of the bevel gear transmission chain 2 and inside the outer shell 100 overlaps with the gear box; the accessories arranged on the opposite sides outside the outer shell 100 shield each other, and the axial projection area of ​​the accessories on each side mainly depends on the accessories with the largest axial projection area on each side. Therefore, all accessories arranged on the device can achieve a smaller windward area. In some specific embodiments, the output active bevel gear 22 is connected to two mutually meshing output driven bevel gears 3 to achieve that the axes of the multiple connecting shafts 4 located on the same side are located in the same plane.

[0049] In some embodiments of the present gear transmission system, the input driven bevel gear 21 and / or the output driving bevel gear 22 are integrated with the transmission shaft 20 .

[0050] In some embodiments of the present gear transmission system, the accessory 5 may be an output power type accessory, which outputs power to the central transmission bevel gear pair 7 through the bevel gear transmission chain 2, thereby driving the main shaft 8 of the gas turbine engine to work.

[0051] With the gear transmission system having the above configuration, each additional output bevel gear assembly can add one or more power diversions, so the transmission chain is very easy to achieve multi-way power diversion. Each power diversion only drives a set of accessories to work independently, and is not affected by other power diversions, thereby minimizing the power of each diversion. In addition, the bevel gear can adopt surface contact transmission, which has a stronger load-bearing capacity. The transmission chain of this configuration can achieve a more reasonable power transmission distribution, a higher power-to-weight ratio, and further miniaturization and lightness of the gearbox, while reducing the volume of the gear and the pitch circle diameter.

[0052] In a specific embodiment, the outer portion of the outer shell 100 is provided with lifting ears and positioning pins to provide positioning and mounting locations for the gear transmission system to be installed on the engine.

[0053] On the other hand, according to some embodiments of the present application, a gas turbine engine is also provided, which includes the gear transmission system as described in one or more of the above embodiments.

[0054] In some specific embodiments, the input driving bevel gear 10 and / or the input driven bevel gear 21 and / or the output driving bevel gear 22 and / or the output driven bevel gear 3 are installed through a bearing seat, and the bearing seat provides positioning and support.

[0055] Figure 3 FIG. 2 shows a front view schematic diagram of a specific embodiment of the gear transmission system. Figure 4 FIG. 2 shows a side schematic diagram of a specific embodiment of the gear transmission system. Figure 5 for Figure 4 The cross-sectional view obtained by cutting along the AA direction is as follows: Figure 6 for Figure 4 Schematic diagram of the cross section obtained by cutting along the BB direction

[0056] The following Figures 3 to 6 The embodiment shown is taken as an example to further illustrate the present invention. It can be understood that in the description Figures 3 to 6 When illustrating the specific embodiment, the reference numeral system used is independent of the reference numeral system in the previous embodiments.

[0057] As shown in the figure, install Figure 5 as well as Figure 6 In the embodiment shown in , the accessories include a hand crank 320 , two sets of generators 321 , a centrifugal ventilator assembly 315 , a hydraulic pump 322 , a lubrication pump 323 , a generator 324 and a speed sensor 325 .

[0058] The transmission shaft is composed of a transmission shaft front shaft 204a and a transmission shaft rear shaft 204b, wherein the transmission shaft front shaft 204a is arranged at the front end in the outer shell, and the transmission shaft rear shaft 204b is arranged at the rear end in the outer shell. The front end and rear end of the transmission shaft front shaft 204a are respectively connected to the input driven bevel gear assembly 312 and the primary output bevel gear assembly 313. The front end and rear end of the transmission shaft rear shaft 204b are respectively connected to the primary output bevel gear assembly 313 and the secondary output bevel gear assembly 316.

[0059] The input driving bevel gear 311 is composed of an input driving bevel gear unit 301a and an input driving wheel bearing seat 305. The input driving wheel bearing seat 305 is provided with a bearing to provide support and positioning for the input driving bevel gear unit 301a. The input driving bevel gear unit 301a is provided with a spline to connect with the transmission rod 20c. The input driving bevel gear 311 is connected to the outer shell near the transmission rod 20c through the mounting edge of the input driving wheel bearing seat 305.

[0060] The input driven bevel gear 312 is composed of an input driven bevel gear unit 301b, an input driven wheel front bearing seat 306a and an input driven wheel rear bearing seat 306b. The input driven wheel front bearing seat 306a and the input driven wheel rear bearing seat 306b are provided with bearings. The input driven bevel gear unit 301b is installed between the input driven wheel front bearing seat 306a and the input driven wheel rear bearing seat 306b, and is supported and positioned. The input driven bevel gear unit 301b is provided with a spline to connect with the transmission shaft front shaft 204a. The input driven bevel gear 312 is connected to the front end of the outer shell through the mounting edges of the input driven wheel front bearing seat 306a and the input driven wheel rear bearing seat 306b.

[0061] The primary output bevel gear assembly 313 (equivalent to the output driving bevel gear 22 described above) is composed of the primary output bevel gear 302a, the centrifugal ventilator output bevel gear 303a and the primary output wheel bearing seat 307a. The primary output wheel bearing seat 307a is provided with a bearing to provide support and positioning for the primary output bevel gear 302a. The primary output bevel gear 302a is provided with a spline to connect with the centrifugal ventilator output bevel gear 303a, the transmission shaft front shaft 204a and the transmission shaft rear shaft 204b. The primary output bevel gear assembly 313 is connected to the middle part of the outer shell through the mounting edge of the primary output wheel bearing seat 307a.

[0062] The generator bevel gear assembly 314 (equivalent to the output driven bevel gear 3 described above) is provided with two groups, consisting of a generator bevel gear 302b and a generator bevel gear bearing seat 307b. The first-stage generator bevel gear bearing seat 307b is provided with a bearing to provide support and positioning for the generator bevel gear 302b. The generator bevel gear 302b is provided with a spline to connect with the input shaft of the generator 321. The generator bevel gear assembly 314 is divided into two groups and connected to the opposite sides of the front half of the outer shell through the inner mounting edge of the generator bevel gear bearing seat 307b.

[0063] The centrifugal ventilator assembly 315 (equivalent to the output driven bevel gear 3 described above) is arranged inside the middle and rear section of the outer shell, and is composed of a centrifugal ventilator bevel gear 303b, a centrifugal ventilator front bearing seat 308a and a centrifugal ventilator rear bearing seat 308b. The centrifugal ventilator bevel gear 303b, wherein the centrifugal ventilation blades and the bevel gear are processed as one piece. The centrifugal ventilator front bearing seat 308a is installed in the outer shell, and the centrifugal ventilator rear bearing seat 308b is installed on the outer shell. The centrifugal ventilator front bearing seat 308a and the centrifugal ventilator rear bearing seat 308b are provided with bearings, and the centrifugal ventilator bevel gear 303b is installed between the centrifugal ventilator front bearing seat 308a and the centrifugal ventilator rear bearing seat 308b and is supported and positioned.

[0064] The secondary output bevel gear assembly 316 (equivalent to the output driven bevel gear 3 described above) is composed of a secondary output bevel gear 304a and a secondary output wheel bearing seat 309a. The secondary output wheel bearing seat 309a is provided with a bearing to provide support and positioning for the secondary output bevel gear 304a. The secondary output bevel gear 304a is provided with a spline to connect it with the rear shaft 204b of the transmission shaft and the input shaft of the generator 324. The secondary output bevel gear assembly 316 is connected to the rear end of the outer shell through the inner mounting edge of the secondary output wheel bearing seat 309a.

[0065] The hydraulic pump bevel gear assembly 317 (i.e., the tail end output driving bevel gear 22a in the aforementioned embodiment) is composed of a hydraulic pump bevel gear 304b and a hydraulic pump bevel gear bearing seat 309b. The hydraulic pump bevel gear bearing seat 309b is provided with a bearing to provide support and positioning for the hydraulic pump bevel gear 304b. The hydraulic pump bevel gear 304b is provided with a spline to connect it to the input shaft of the hydraulic pump 322. The hydraulic pump bevel gear assembly 317 is connected to the right side of the rear half of the outer shell through the inner mounting edge of the hydraulic pump bevel gear bearing seat 309b.

[0066] The lubrication pump bevel gear assembly 318 (equivalent to the output driven bevel gear 3 described above) is composed of a lubrication pump bevel gear 304c and a lubrication pump bevel gear bearing seat 309c. The lubrication pump bevel gear bearing seat 309c is provided with a bearing to provide support and positioning for the lubrication pump bevel gear 304c. The lubrication pump bevel gear 304c is provided with a spline and rectangular teeth, and the lubrication pump bevel gear 304c is connected to the input shaft of the lubrication pump 323 through the spline. The lubrication pump bevel gear assembly 318 is connected to the left side of the rear half of the outer shell through the inner mounting edge of the lubrication pump bevel gear bearing seat 309c.

[0067] In the assembled state, the two sets of generators 321 are connected to the outer mounting edges of the two sets of generator bevel gear bearing seats 307b, the hydraulic pump 322 is connected to the outer mounting edge of the hydraulic pump bevel gear bearing seat 309b, the lubrication pump 323 is connected to the outer mounting edge of the lubrication pump bevel gear bearing seat 309c, the centrifugal ventilator assembly 315 is connected to the outer casing through the mounting edges of the centrifugal ventilator front bearing seat 308a and the centrifugal ventilator rear bearing seat 308b, the hand crank 320 can only be connected to the spline of the input driven bevel gear 301b when the engine is overhauled, the generator 324 is connected to the outer mounting edge of the secondary output wheel bearing seat 309a, and the speed sensor 325 is installed on the outer casing, which is used to receive the reflected signal of the rectangular teeth of the lubrication pump bevel gear 304c to convert and measure the main shaft speed of the engine.

[0068] The hand crank 320 is installed at the head of the gearbox during maintenance, the generator 324 is installed at the tail of the gearbox, and the other accessories are arranged in a "V" shape on both sides of the gearbox. The left side of the gearbox is equipped with a generator 321, a speed sensor 325 and a lubrication pump 323 from front to back, and the output axis of the speed sensor 325 is perpendicular to the output axis of the lubrication pump 323. The right side of the gearbox is equipped with a generator 321 and a hydraulic pump 322 at the front and back. In the windward direction, the compact accessory transmission gearbox device shields the generator 324, the left side of the generator 321 shields the speed sensor 325 and the lubrication pump 323, and the right side of the generator 321 shields the hydraulic pump 322.

[0069] When the engine is started, the two sets of starter generators 321 drive the two starter generator bevel gears 302b, and the two starter generator bevel gears 302b together drive the first-stage output bevel gear 302a, and the first-stage output bevel gear 302a drives the transmission shaft front shaft 204a, and the transmission shaft front shaft 204a drives the input driven bevel gear 301b, and the input driven bevel gear 301b drives the input driving bevel gear 301a, and the input driving bevel gear 301a drives the transmission rod 20c, and the transmission rod 20c drives the central transmission bevel gear pair, and the central transmission bevel gear pair drives the main shaft of the engine to start working.

[0070] When the engine is overhauled, the hand crank 320 drives the input driven bevel gear 301b, the input driven bevel gear 301b drives the input driving bevel gear 301a, the input driving bevel gear 301a drives the transmission rod 20c, the transmission rod 20c drives the central transmission bevel gear pair, and the central transmission bevel gear pair drives the main shaft of the engine to rotate.

[0071] Through the gear transmission device described in the above specific embodiment, a full bevel gear transmission chain with five-way power split is adopted, and there is no intermediate gear to adjust the length of the transmission chain. All arc bevel gears are used for transmission, with large overlap, surface contact transmission, and strong power transmission capacity. The windward area of ​​the accessories mainly depends on the two sets of generators and is not affected by the other accessories. Specifically, in this embodiment, the size of the generator is the largest. In practice, it is usually limited by the largest accessory. The output shafts of the left and right columns of accessories are not installed parallel to each other, which effectively utilizes the accessory installation space.

[0072] The terms described in one or more embodiments of the present application are explained as follows:

[0073] Accessories: Mainly used to start and support the operation of aircraft engines, generally including starters, generators, lubrication pumps, hydraulic pumps, fuel pumps, centrifugal ventilators, speed sensors, etc.

[0074] Windward Area: The maximum cross-sectional area of ​​an aircraft engine along the flight direction in the cruising state. The main axis of an aircraft engine forms a small angle with the flight direction in the cruising state, so the maximum cross-sectional area of ​​a commonly used aircraft engine along the main axis is approximately equal to the windward area, and the windward area has a negative impact on the aerodynamic drag of the engine.

[0075] In the description of the embodiments of the present application, technical terms such as "first" and "second" are only used to distinguish different objects and cannot be understood as indicating or implying relative importance or implicitly indicating the number, specific order or primary and secondary relationship of the indicated technical features.

[0076] In some specific embodiments, the outer shell 100 may be a single component formed in one piece, or may be a shell component assembled from multiple parts.

[0077] In the description of the embodiments of the present application, the term "and / or" is only a description of the association relationship of the associated objects, indicating that there may be three relationships. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character " / " in this article generally indicates that the associated objects before and after are in an "or" relationship.

[0078] In the description of the embodiments of the present application, unless otherwise clearly specified and limited, technical terms such as "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, and it can be the internal connection of two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the embodiments of the present application can be understood according to the specific circumstances.

[0079] It should be understood that "along" a certain direction mentioned in the text means that there is at least a component in the direction, preferably, the angle with the direction is within 5°, and more preferably, the angle is within 3°.

[0080] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them; although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein by equivalents; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application, and they should all be included in the scope of the claims and specification of the present application. In particular, as long as there is no structural conflict, the various technical features mentioned in the various embodiments can be combined in any way. The present application is not limited to the specific embodiments disclosed herein, but includes all technical solutions that fall within the scope of the claims.

Claims

1. A gear transmission system, characterized in that: include: A power input assembly, including an input driving bevel gear; A bevel gear transmission chain, comprising a transmission shaft, an input driven bevel gear sleeved on the outer circumference of the transmission shaft, and a plurality of output driving bevel gears sleeved on the outer circumference of the transmission shaft, wherein the input driven bevel gear and each of the output driving bevel gears are respectively connected to the transmission shaft in a transmission manner, the input driven bevel gear and the output driving bevel gear and two adjacent output driving bevel gears are respectively spaced apart by a distance along the axial direction of the transmission shaft, and the input driven bevel gear is meshed with the input driving bevel gear; as well as A plurality of output driven bevel gears are arranged corresponding to the output driving bevel gears one by one, each of the output driven bevel gears is respectively meshed with the corresponding output driving bevel gear, and each of the output driven bevel gears is drivingly connected to the gas turbine engine accessories through a connecting shaft.

2. The gear transmission system according to claim 1, characterized in that: The input driven bevel gear is arranged at one end of the transmission shaft.

3. The gear transmission system according to claim 2, characterized in that: The output driving bevel gear comprises a tail end output driving bevel gear arranged at the other end of the transmission shaft; Wherein, the gear transmission system also includes a head-end connecting shaft and a tail-end connecting shaft, the input driven bevel gear is transmission-connected to a gas turbine engine accessory arranged at one end of the transmission shaft through the head-end connecting shaft, the tail-end output active bevel gear is transmission-connected to a gas turbine engine accessory arranged at the other end of the transmission shaft through the tail-end connecting shaft, and the head-end connecting shaft and the tail-end connecting shaft are respectively coaxially arranged with the transmission shaft.

4. The gear transmission system according to claim 1, characterized in that: The power input assembly includes a central transmission bevel gear pair, which extracts power from the main shaft of the gas turbine engine and is drivingly connected to the input driving bevel gear.

5. The gear transmission system according to claim 4, characterized in that: The transmission shaft is arranged parallel to the main shaft.

6. The gear transmission system according to claim 1, characterized in that: It also includes an outer shell, the bevel gear transmission chain and the multiple output driven bevel gears are respectively arranged inside the outer shell, and the connecting shaft passes through the shell and is drivingly connected to the gas turbine engine accessories.

7. The gear transmission system according to claim 6, characterized in that: The outer shell is cylindrical, and the rotation axis of the outer shell is parallel to or coaxial with the axial direction of the transmission shaft.

8. The gear transmission system according to claim 6, characterized in that: The gas turbine engine accessories include internal accessories, which are integrally arranged with the connecting shaft and the corresponding output driven bevel gear, the internal accessories are arranged inside the outer shell, and the remaining accessories are arranged outside the outer shell.

9. The gear transmission system according to claim 6, characterized in that: The connecting shaft is connected to the output driven bevel gear and gas turbine engine accessories on both axial sides of the transmission shaft; Wherein, the axes of the multiple connecting shafts located on the same side are located in the same plane.

10. A gas turbine engine, characterized in that: Comprising a gear transmission system as claimed in any one of claims 1 to 9.

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