Aero-engine planetary gear transmission system capable of achieving stepless speed change

Abstract

According to the aero-engine planetary gear transmission system capable of achieving stepless speed change, motion decomposition and synthesis can be conducted through a two-stage planetary gear train and a motor system, and stepless speed change of the gear transmission system is achieved. In other words, stepless speed change of the gear transmission system can be achieved only by changing the load of the adjustable-speed motor or changing the input rotating speed and the input rotating direction of the adjustable-speed motor under the two working conditions. The structure is simple, and the purposes of optimizing the performance of an aero-engine system, improving the efficiency and improving the economical efficiency can be achieved only by adjusting the power distribution mode, the operation rotating speed, the working torque and the like between the high-pressure rotor and the fan rotor of the engine.

Description

Technical Field

[0001] The present invention relates to the technical field of continuously variable transmission gearboxes for aero-engines, and particularly to a planetary gear transmission system for aero-engines that can achieve continuously variable transmission. Background Art

[0002] Generally, the thermodynamic cycle characteristics of the bypass ratio of an aero-engine are fixed. An engine can only obtain the optimal working performance under the thermodynamic cycle characteristic mode of a specific working condition. In order to further improve the performance and fuel efficiency of the engine at a fixed bypass ratio, it is necessary to optimize the internal design of the engine to meet the development requirements of high thrust and low fuel consumption of the engine. In the field of civil aero-engines, there is a GTF (Geared TurboFan) engine, which installs a planetary gearbox between the fan rotor and the low-pressure rotor, enabling the fan rotor to operate at a low speed and the low-pressure compressor to operate at a high speed, improving the compressor efficiency while increasing the fan diameter and the bypass ratio.

[0003] In order to achieve continuously variable speed control of the aero-engine bypass fan rotor, by adjusting the power distribution method, operating speed, working torque, etc. between the high-pressure rotor and the fan rotor of the engine, the purpose of optimizing the performance, improving the efficiency or enhancing the economy of the aero-engine system is achieved. Therefore, a variable speed gear transmission system that can meet the requirements of aero-engines is needed. Summary of the Invention

[0004] The object of the present invention is to provide a planetary gear transmission system for aero-engines that can achieve continuously variable transmission, characterized in that:

[0005] It includes a first-stage differential planetary gear train, a second-stage speed-increasing planetary gear train installed inside the gearbox, and a speed control system.

[0006] The first-stage differential planetary gear train includes a planetary gear train composed of a first-stage sun gear, several first-stage planetary gears, a first-stage internal gear ring, a first-stage planetary carrier, and the rotating shafts and supporting bearings of each gear. The first-stage sun gear is the power input end of the first-stage differential planetary gear train. The first-stage internal gear ring is the power input end or output end of the first-stage differential planetary gear train. The first-stage planetary carrier is the power output end of the first-stage differential planetary gear train.

[0007] The second-stage speed-increasing planetary gear train includes a planetary gear train composed of a second-stage internal gear ring, several second-stage planetary gears, a second-stage planetary carrier, and a second-stage sun gear, and the rotating shafts and supporting bearings of each gear. The second-stage internal gear ring is the power input end of the second-stage speed-increasing planetary gear train. The first-stage planetary carrier of the first-stage differential planetary gear train inputs power to the second-stage internal gear ring. The second-stage sun gear serves as the power output end of the entire transmission system.

[0008] The speed control system includes a speed control motor and a transmission gear train. The rotating shaft of the speed control motor is transmitted to the first-stage internal gear ring of the first-stage differential planetary gear train through the transmission gear train.

[0009] During operation, the following working conditions are included:

[0010] An aviation-1 that can achieve stepless speed change-

[0011] Engine planetary gear transmission system

[0012] "One input and two outputs": The speed control motor is the load, that is, a generator. The power of the engine is input to the first-stage sun gear, and the first-stage internal gear ring and the first-stage planetary carrier are the power output ends of the first-stage differential planetary gear train. By changing the load size of the speed control motor, stepless speed change of the second-stage sun gear of the entire transmission system is achieved.

[0013] "Two inputs and one output": The speed control motor is the input, that is, a motor. The power of the engine is input to the first-stage sun gear, and the power of the speed control motor is input to the first-stage internal gear ring. The first-stage planetary carrier is the power output end of the first-stage differential planetary gear train. By changing the input speed size and the input rotation direction (forward or reverse) of the speed control motor, stepless speed change of the second-stage sun gear of the entire transmission system is achieved.

[0014] Furthermore, the outer side of the first-stage internal gear ring has bevel teeth, so that the first-stage internal gear ring is equivalent to a large bevel gear that meshes externally with a small bevel gear. The rotating shaft of the first-stage internal gear ring is the rotation angle of the large bevel gear. The large bevel gear meshes externally with the small bevel gear, and the shaft intersection angle is 90°. The small bevel gear is transmitted to the rotating shaft of the speed control motor through the transmission gear train.

[0015] Furthermore, the transmission gear train of the speed control system includes a small bevel gear II and a large bevel gear II. The small bevel gear is coaxial with the large bevel gear II. The small bevel gear II meshes externally with the large bevel gear II. The small bevel gear II is coaxial with the speed control motor, its axis is parallel to the axis of the first-stage sun gear, and the small bevel gear II is driven by the speed control motor.

[0016] Furthermore, the input shaft is connected to the high-pressure rotor of the aeroengine; the output shaft is connected to the ducted fan rotor of the aeroengine.

[0017] The technical effects of the present invention are beyond doubt and have the following technical effects:

[0018] 1. The aeroengine planetary variable speed gear transmission system is a transmission mechanism based on the theory of "first differential stepless speed regulation and then speed increase". The first-stage differential planetary gear train has two motion modes: "one input and two outputs" or "two inputs and one output".

[0019] 2. The first-stage differential planetary gear train is in a deceleration process. The output speed of the first-stage planet carrier is controlled to be in a low-speed state, and then through the second-stage speed-increasing planetary gear train, the low speed of the first-stage planet carrier is increased to the required speed.

[0020] 3. The large bevel gear and the first-stage internal gear ring are integral parts.

[0021] 4. When the first-stage differential planetary gear train has "one input and two outputs", this motion mode is a decomposed motion. The engine power is input to the first-stage sun gear, and the power is split to the first-stage internal gear ring and the first-stage planet carrier. The first-stage internal gear ring and the first-stage planet carrier are the power output ends of the first-stage differential planetary gear train. The decomposed motion means that the motion or power can be synthesized and transmitted from one input shaft to the other two output shafts. By changing the ratio of the motion decomposition, stepless speed regulation of the output shaft is achieved, that is, by changing the load of the speed control motor, stepless variable speed of the gear transmission system is realized.

[0022] 5. When the first-stage differential planetary gear train has "two inputs and one output", this motion mode is a synthetic motion. The engine power is input to the first-stage sun gear, and the power of the speed control motor is input to the first-stage internal gear ring. The two input powers are combined and flow to the first-stage planet carrier. The first-stage planet carrier serves as the power output end of the first-stage differential planetary gear train. The synthetic motion means that the motion or power can be transmitted from two input shafts to another output shaft. By changing the input speed and input rotation direction of the two input components, stepless speed regulation of the output shaft is achieved. That is, by changing the input speed and input rotation direction of the speed control motor, stepless variable speed of the gear transmission system is realized. Description of the Drawings

[0023] Figure 1 is the schematic diagram of the gear transmission system of the present invention;

[0024] Figure 2 is the sectional structural schematic diagram of the gear transmission system of the present invention.

[0025] In the figure: the first-stage differential planetary gear train (01), the speed regulation part (02), the external spline shaft (04), the second-stage speed increasing planetary gear train (03), the input shaft (0101), the first-stage sun gear (0102), several first-stage planetary gears (0103), several first-stage planetary gear pins (0104), the first-stage internal gear ring (0105), several first-stage planetary gear bearings (0106), the first-stage internal gear ring bearing I (0107), the first-stage internal gear ring bearing II (0108), the first-stage bearing seat (0109), the first-stage planet carrier (0110), the first-stage planet carrier bearing I (0111), the first-stage planet carrier bearing II (0112), the input shaft bearing I (0113), the input shaft bearing II (0114), the large bevel gear I (0115), the small bevel gear I (0116), the small bevel gear bearing I (0117), the small bevel gear bearing II (0118), the bevel gear bearing seat (0119), the end cover (0120), the large bevel gear II (0201), the small bevel gear II (0202), the speed regulation motor (0203), the second-stage internal gear ring (0301), the second-stage internal gear ring bearing (0302), several second-stage planetary gears (0303), several second-stage planetary gear bearings (0304), several second-stage planetary gear pins (0305), the second-stage planet carrier (0306), the second-stage sun gear (0307), the output shaft (0308), the output shaft bearing I (0309), the output shaft bearing II (0310), the second-stage bearing seat (0311), the housing (0312). Detailed implementation mode

[0026] The present invention will be further described below in conjunction with embodiments, but it should not be understood that the above-mentioned subject matter scope of the present invention is limited to the following embodiments. Without departing from the above technical idea of the present invention, various substitutions and changes made according to ordinary technical knowledge and customary means in the art shall be included in the protection scope of the present invention.

[0027] Embodiment 1:

[0028] An aeroengine planetary gear transmission system capable of realizing stepless speed change, characterized in that:

[0029] It includes a first-stage differential planetary gear train (01), a second-stage speed increasing planetary gear train (03) installed inside the gearbox, and a speed regulation system (02);

[0030] The first-stage differential planetary gear train (01) includes a planetary gear train composed of a first-stage sun gear (0102), a number of first-stage planetary gears (0103), a first-stage internal gear ring (0105), a first-stage planet carrier (0110), as well as the rotating shafts and matching bearings of each gear; the first-stage sun gear (0102) is the power input end of the first-stage differential planetary gear train (01); the first-stage internal gear ring (0105) is the power input end or power output end of the first-stage differential planetary gear train (01); the first-stage planet carrier (0110) is the power output end of the first-stage differential planetary gear train (01).

[0031] The second-stage speed-increasing planetary gear train (03) includes a planetary gear train composed of a second-stage internal gear ring (0301), a number of second-stage planetary gears (0303), a second-stage planet carrier (0306), and a second-stage sun gear (0307), as well as the rotating shafts and matching bearings of each gear; the second-stage internal gear ring (0301) is the power input end of the second-stage speed-increasing planetary gear train (03); the first-stage planet carrier (0110) of the first-stage differential planetary gear train (01) inputs power to the second-stage internal gear ring (0301); the second-stage sun gear (0307) serves as the power output end of the entire transmission system.

[0032] The speed regulation system (02) includes a speed regulation motor (0203) and a transmission gear train; the rotating shaft of the speed regulation motor (0203) is transmitted through the transmission gear train with the first-stage internal gear ring (0105) of the first-stage differential planetary gear train (01).

[0033] During operation, the following working conditions are included:

[0034] "One input and two outputs": The speed regulation motor (0203) is a load, that is, a generator; the engine power is input to the first-stage sun gear (0102), and the first-stage internal gear ring (0105) and the first-stage planet carrier (0110) are the power output ends of the first-stage differential planetary gear train (01); by changing the load size of the speed regulation motor (0203), stepless variable speed of the second-stage sun gear (0307) serving as the entire transmission system is achieved.

[0035] "Two inputs and one output": The speed regulation motor (0203) is an input, that is, a motor; the engine power is input to the first-stage sun gear (0102), the speed regulation motor (0203) power is input to the first-stage internal gear ring (0105), and the first-stage planet carrier (0110) serves as the power output end of the first-stage differential planetary gear train (01); by changing the input speed size and input rotation direction of the speed regulation motor (0203), stepless variable speed of the second-stage sun gear (0307) serving as the entire transmission system is achieved.

[0036] It should be noted that during use, the high-pressure rotor of the aero-engine is splined to the input shaft (0101) of the first-stage differential planetary gear train (01); the ducted fan rotor of the aero-engine is splined to the output shaft (0308) of the second-stage speed-increasing planetary gear train (03); the internal spline structures of the input shaft (0101) and the output shaft (0308) can reduce the vibration and misalignment effects of the high-pressure rotor and the ducted fan rotor of the aero-engine on the gear transmission system.

[0037] In this embodiment, both stages adopt the NGW type planetary gear train, and there are several planetary gears in both stages; the first-stage differential planetary gear train (01) is a deceleration process, controlling the output speed of the first-stage planet carrier (0110) to be in a low-speed state; the second-stage speed-increasing planetary gear train (02) is a fixed-axis gear train, increasing the low speed of the first-stage planet carrier (0110) to the required speed; the number of planetary gears in the two-stage planetary gear train can be adjusted according to the transmission power. The above design in this embodiment can ensure that the gear transmission system has a compact structure, smaller volume and mass.

[0038] Embodiment 2:

[0039] An aviation - 4 -

[0040] engine planetary gear transmission system

[0041] The main structure of this embodiment is the same as that of Embodiment 1. Further, during specific installation, the input shaft (0101) and the first-stage sun gear (0102) are splined and have a floating dimension axially; the output shaft (0308) and the second-stage sun gear (0307) are splined and have a floating dimension axially; the spline mating structure can have a floating margin axially and radially, which can improve the load sharing ability of the sun gear of the planetary gear train in the circumferential direction.

[0042] The first-stage planet carrier (0110) and the second-stage internal gear ring (0301) are both splined to the external spline shaft (04);

[0043] The first-stage bearing housing (0109) is equipped with the first-stage internal gear ring bearing I (0107), the first-stage internal gear ring bearing II (0108), the first-stage planet carrier bearing II (0112), and the input shaft bearing I (0113); the outer ring of the first-stage internal gear ring bearing I (0107) is fitted and installed with the first-stage bearing housing (0109); the inner ring of the first-stage internal gear ring bearing II (0108) is fitted and installed with the first-stage internal gear ring bearing I (0107); the outer ring of the first-stage planet carrier bearing II (0112) is fitted and installed with the first-stage internal gear ring bearing I (0107); the outer ring of the input shaft bearing I (0113) is fitted and installed with the first-stage internal gear ring bearing I (0107); the first-stage internal gear ring bearing I (0107) is installed at one end of the casing (0312) and fixed to the casing (0312) with screws; the input shaft (0101) is designed with an external spline structure, the inner ring of the input shaft bearing I (0113) is fitted and installed with the input shaft (0101), and the outer ring of the input shaft bearing II (0114) is fitted and installed with the input shaft (0101); the first-stage sun gear (0102) is connected to the input shaft (0101) by splines; the several first-stage planet pins (0104) are supported between the first-stage internal gear ring (0105) and the first-stage sun gear (0102) through the first-stage planet carrier (0110); the several first-stage planet pins (0104) are arranged around the first-stage sun gear (0102); the several first-stage planet gears (0103) are sleeved on the first-stage planet pins (0104) through the first-stage planet gear bearings (0106); the several first-stage planet pins (0104), the several first-stage planet gear bearings (0106), and the several first-stage planet gears (0104) constitute the shafting of the first-stage planet gears; the several first-stage planet gears (0103) are externally meshed with the first-stage sun gear (0102); the several first-stage planet gears (0103) are internally meshed with the first-stage internal gear ring (0105); the large bevel gear (0115) and the first-stage internal gear ring (0105) are integral parts; the two ends of the small bevel gear (0116) are respectively fitted and installed with the inner rings of the small bevel gear bearing I (0117) and the small bevel gear bearing II (0118); the outer ring of the small bevel gear bearing I (0117) is installed on the casing (0312); the outer ring of the small bevel gear bearing II (0118) is fitted and installed with the bevel gear bearing housing (0119); the bevel gear bearing housing (0119) is fixed to the casing (0312) with bolts; the end cover (0120) is fitted and installed with the bevel gear bearing housing (0119) and fixed to the bevel gear bearing housing (0119) with bolts; the end cover (0120) presses the outer ring of the small bevel gear bearing II (0118) to prevent the axial movement of the small bevel gear bearing II (0118); the large bevel gear (0115) is externally meshed with the small bevel gear (0116), and the shaft intersection angle is 90°;The left and right sides of the first-stage planet carrier (0110) are fitted and installed with the inner rings of the first-stage planet carrier bearing I (0111) and the first-stage planet carrier bearing II (0112); the outer ring of the first-stage planet carrier bearing II (0112) is fitted and installed with the housing (0312).

[0044] The first-stage planet carrier (0110) and the second-stage internal gear ring (0301) are designed with internal splines and are spline-connected to the external spline shaft (04); steps are designed at the relief grooves of the internal splines of the first-stage planet carrier (0110) and the second-stage internal gear ring (0301) to limit the axial movement of the external spline shaft (04).

[0045] The housing (0312) is an overall cylindrical structure with open ends at both ends and a hollow interior; the front open end of the housing (0312) is sealed with the first-stage bearing seat (0109); the rear open end of the housing (0312) is sealed with the second-stage bearing seat (0311); the second-stage bearing seat (0311) and the second-stage planet carrier (0306) are fixed to the housing (0312) with bolts.

[0046] The inner ring of the first-stage sun gear bearing II (0114) is fitted and installed with the second-stage planet carrier (0306).

[0047] The several second-stage planet pins (0305) are supported by the second-stage planet carrier (0306) between the second-stage internal gear ring (0301) and the second-stage sun gear (0307); the several second-stage planet pins (0305) are arranged around the second-stage sun gear (0307); the second-stage planet gears (0303) are sleeved on the second-stage planet pins (0305) through the second-stage planet gear bearings (0304); the several second-stage planet pins (0305), the several second-stage planet gear bearings (0304) and the several second-stage planet gears (0303) form the shafting of the second-stage planet gears; the several second-stage planet gears (0303) are externally meshed with the second-stage sun gear (0307); the several second-stage planet gears (0303) are internally meshed with the second-stage internal gear ring (0301); the output shaft (0308) is designed with an external spline structure, and the inner rings of the output shaft bearing I (0309) and the output shaft bearing II (0310) are fitted and installed with the output shaft (0308); the second-stage sun gear (0307) is spline-connected to the output shaft (0308); the outer ring of the output shaft bearing II (0310) is fitted and installed with the second-stage planet carrier (0306); the outer ring of the output shaft bearing I (0309) is fitted and installed with the second-stage bearing seat (0311).

[0048] Embodiment 3:

[0049] The main structure of this embodiment is the same as that of Embodiment 1. Further, the large bevel gear (0115) and the first-stage internal gear ring (0105) are integral parts, that is, the outer side of the first-stage internal gear ring (0105) has bevel teeth, so that the first-stage internal gear ring (0105) is equivalent to a large bevel gear (0115) that externally meshes with the small bevel gear (0116). The rotating shaft of the first-stage internal gear ring (0105) is the rotation angle of the large bevel gear (0115); the large bevel gear (0115) externally meshes with the small bevel gear (0116), and the shaft intersection angle is 90°; the small bevel gear (0116) and the rotating shaft of the speed-regulating motor (0203) are transmitted through the transmission gear train.

[0050] The transmission gear train of the speed-regulating system (02) includes a small bevel gear II (0202) and a large bevel gear II (0201); the small bevel gear (0116) and the large bevel gear II (0201) are coaxial; the small bevel gear II (0202) externally meshes with the large bevel gear II (0201); the small bevel gear II (0202) and the speed-regulating motor (0203) are coaxial, and its axial direction is parallel to the axis of the first-stage sun gear (0102). The small bevel gear II (0202) is driven by the speed-regulating motor.

[0051] It should be noted that in the embodiment, the motion mode of the gear transmission system ("one input and two outputs" or "two inputs and one output") can be selected according to the actual working conditions of the aero-engine to achieve stepless speed change.

[0052] In the "one input and two outputs" working condition (when the aero-engine needs the gear transmission system to perform a decomposition motion), the engine power is input through the input shaft (0101). The input shaft (0101) and the first-stage sun gear (0102) are spline-connected. The power is split from the first-stage sun gear (0102) to the first-stage internal gear ring (0105) and the first-stage planet carrier (0110). A part of the power is output from the first-stage internal gear ring (0105), and is transmitted to the speed-regulating motor (0203) through the large bevel gear I (0115), the small bevel gear I (0116), the large bevel gear II (0201), and the small bevel gear II (0202). At this time, the speed-regulating motor (0203) is a load and acts as a generator; another part of the power is transmitted from the first-stage planet carrier (0110) through the external spline shaft (04) to the second-stage speed-increasing planetary gear train (03) for speed-increasing output; it is ensured that under the ideal working state of the engine, only the load size of the speed-regulating motor (0203) is changed to achieve stepless speed change of the gear transmission system.

[0053] In the "two inputs and one output" working condition (when the aeroengine requires the gear transmission system to perform a combined motion), a part of the power is input from the engine through the input shaft (0101). The input shaft (0101) and the first-stage sun gear (0102) are spline-connected. The power is transmitted from the first-stage sun gear (0102) to the first-stage planet gear (0103). Another part of the power is transmitted from the speed-regulating motor (0203), through the small bevel gear II (0202), the large bevel gear II (0201), the small bevel gear I (0116), the large bevel gear I (0115) and the first-stage internal gear ring (0105) to the first-stage planet gear (0103). The two parts are combined at the first-stage planet gear (0103), and then transmitted through the first-stage planet carrier (0110) and the external spline shaft (04) to the second-stage speed-increasing planetary gear train (03) for speed-increasing output. It is ensured that when the engine is in the ideal working state, only by changing the input speed magnitude and the input rotation direction of the speed-regulating motor (0203), the stepless speed change of the gear transmission system can be realized.

Claims

1. An aircraft engine planetary gear transmission system capable of achieving stepless speed change, characterized in that: It comprises the first differential-stage planetary gear train (01), the second speed-increasing-stage planetary gear train (03), and a speed regulating system (02) installed inside a gear box; The first differential planetary gear train (01) comprises a planetary gear train consisting of a first sun gear (0102), a plurality of first planetary gears (0103), a first inner gear ring (0105), a first planet carrier (0110), and a rotating shaft and a matching bearing of each gear; the first sun gear (0102) is a power input end of the first differential planetary gear train (01); the first inner gear ring (0105) is a power input end or a power output end of the first differential planetary gear train (01); and the first planet carrier (0110) is a power output end of the first differential planetary gear train (01); The second-stage speed-increasing planetary gear train (03) comprises a planetary gear train consisting of a second-stage inner gear ring (0301), a plurality of second-stage planetary gears (0303), a second-stage planet carrier (0306) and a second-stage sun gear (0307), as well as the rotating shafts and matching bearings of each gear; the second-stage inner gear ring (0301) is the power input end of the second-stage speed-increasing planetary gear train (03); the first-stage planet carrier (0110) of the first-stage differential planetary gear train (01) inputs power to the second-stage inner gear ring (0301); and the second-stage sun gear (0307) serves as the power output end of the entire transmission system; The speed regulating system (02) comprises a speed regulating motor (0203) and a transmission gear train; the transmission gear train is used to transmit power between the rotating shaft of the speed regulating motor (0203) and the first-stage inner gear ring (0105) of the first-stage differential-stage planetary gear train (01); When working, the following conditions are included: "One input and two outputs": the speed regulating motor (0203) is the load, i.e., the generator; the engine power is input to the first-stage sun gear (0102), the first-stage inner gear ring (0105) and the first-stage planetary carrier (0110) are the power output ends of the first-stage differential planetary gear train (01); by changing the load size of the speed regulating motor (0203), the adjustable stepless speed change of the second-stage sun gear (0307) as the entire transmission system is achieved; "Two inputs and one output": the speed regulating motor (0203) is the input, that is, the electric motor; the engine power is input to the first-stage sun gear (0102), the speed regulating motor (0203) power is input to the first-stage inner gear ring (0105), and the first-stage planetary carrier (0110) serves as the power output end of the first-stage differential planetary gear system (01); by changing the input speed and input rotation direction of the speed regulating motor (0203), the adjustable stepless speed change of the second-stage sun gear (0307) as the entire transmission system is achieved.

2. The planetary gear transmission system for an aircraft engine capable of achieving continuously variable speed according to claim 1, characterized in that: The first-stage inner gear ring (0105) has bevel teeth on the outside, so that the first-stage inner gear ring (0105) is equivalent to a large bevel gear (0115) that is externally meshed with a small bevel gear (0116), and the rotation axis of the first-stage inner gear ring (0105) is the rotation angle of the large bevel gear (0115); the large bevel gear (0115) is externally meshed with the small bevel gear (0116), and the axis intersection angle is 90°; the small bevel gear (0116) and the rotation axis of the speed regulating motor (0203) are transmitted through the transmission gear train.

3. The planetary gear transmission system for an aircraft engine capable of achieving continuously variable speed according to claim 1, characterized in that: The transmission gear train of the speed regulation system (02) comprises a small bevel gear II (0202) and a large bevel gear II (0201); the small bevel gear (0116) is coaxial with the large bevel gear II (0201); the small bevel gear II (0202) is externally meshed with the large bevel gear II (0201); the small bevel gear II (0202) is coaxial with the speed regulation motor (0203), and its axial direction is parallel to the axis of the first-stage sun gear (0102), and the small bevel gear II (0202) is driven by the speed regulation motor.

4. The planetary gear transmission system for an aircraft engine capable of continuously variable speed according to claim 1, characterized in that: The input shaft (0101) is connected to the high-pressure rotor of the aircraft engine; the output shaft (0308) is connected to the ducted fan rotor of the aircraft engine.

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