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

Abstract

The application provides an aero-engine planetary gear transmission system capable of realizing stepless speed change. The motion decomposition and synthesis are realized through two-stage planetary gear trains and motor systems, so that the stepless speed change of the gear transmission system is realized. That is, only by changing the load size of the speed regulating motor or the input rotating speed size and input rotating direction of the speed regulating motor under two working conditions, the stepless speed change of the gear transmission system can be realized. The application has simple structure, and only by adjusting the power distribution mode, running rotating speed, working torque and the like between the high-pressure rotor and the fan rotor of the engine, the performance optimization, efficiency improvement and economic improvement of the aero-engine system can be realized.

Description

Technical Field

[0001] This invention relates to the field of continuously variable transmission (CVT) gearbox technology for aero-engines, and more specifically to a planetary gear transmission system for aero-engines capable of continuously variable transmission. Background Technology

[0002] The thermodynamic cycle characteristics of a typical aero-engine's bypass ratio are fixed. An engine can only achieve optimal performance under specific operating conditions and thermodynamic cycle characteristics. To further improve engine performance and fuel efficiency with a fixed bypass ratio, it is necessary to optimize the engine's internal design to meet the development requirements of high thrust and low fuel consumption. In the field of civil aero-engines, there is the GTF (Geared TurboFan) engine, which installs a planetary gearbox between the fan rotor and the low-pressure rotor. This allows the fan rotor to operate at low speeds while the low-pressure compressor operates at high speeds, improving compressor efficiency while increasing the fan diameter and thus the bypass ratio.

[0003] To achieve stepless speed control of the ducted fan rotor of an aero-engine, the power distribution method, operating speed, and working torque between the high-pressure rotor and the fan rotor are adjusted to optimize the performance, improve efficiency, or enhance economy of the aero-engine system. Therefore, a variable speed gear transmission system that can meet the requirements of aero-engines is needed. Summary of the Invention

[0004] The purpose of this 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, and a speed control system, all installed inside the gearbox.

[0006] The first-stage differential planetary gear train comprises a first-stage sun gear, several first-stage planet gears, a first-stage internal gear ring, a first-stage planet carrier, and the shafts and bearings of each gear. The first-stage sun gear is the power input terminal of the first-stage differential planetary gear train. The first-stage internal gear ring is either the power input or output terminal of the first-stage differential planetary gear train. The first-stage planet carrier is the power output terminal of the first-stage differential planetary gear train.

[0007] The second-stage speed-increasing planetary gear train comprises a second-stage internal gear ring, several second-stage planetary gears, a second-stage planetary carrier, a second-stage sun gear, and shafts and bearings for each gear. The second-stage internal gear ring serves as the power input to the second-stage speed-increasing planetary gear train. The first-stage planetary carrier of the first-stage differential planetary gear train supplies power to the second-stage internal gear ring. The second-stage sun gear serves as the power output to the entire transmission system.

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

[0009] During operation, the following working conditions apply:

[0010] An aviation-1 type capable of continuously variable transmission

[0011] Engine planetary gear transmission system

[0012] "One input, two outputs": The speed-regulating motor acts as the load, i.e., the generator. Engine power is input to the first-stage sun gear, while the first-stage internal gear ring and first-stage planetary carrier are the power output terminals of the first-stage differential planetary gear system. By changing the load on the speed-regulating motor, adjustable stepless speed change is achieved for the second-stage sun gear, which serves as the entire transmission system.

[0013] "Two inputs and one output": The speed-regulating motor is the input, i.e., the electric motor. Engine power is input to the first-stage sun gear, and the speed-regulating motor power is input to the first-stage internal gear ring. The first-stage planetary carrier serves as the power output of the first-stage differential planetary gear system. By changing the input speed and direction of rotation (forward or reverse) of the speed-regulating motor, adjustable stepless speed change of the second-stage sun gear, which is the second stage of the entire transmission system, is achieved.

[0014] Furthermore, the outer side of the first-stage internal gear ring has bevel teeth, making the first-stage internal gear ring equivalent to a large bevel gear meshing with the small bevel gear. The rotation axis of the first-stage internal gear ring is the rotation angle of the large bevel gear. The large bevel gear meshes with the small bevel gear, and the axis angle is 90°. The small bevel gear is transmitted to the rotation axis of the speed-regulating motor through the transmission gear train.

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

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

[0017] The technical effects of this invention are undeniable, and it has the following technical effects:

[0018] 1. The planetary gear transmission system of aero-engine adopts the transmission mechanism based on the theory of "differential stepless speed regulation first, 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 a deceleration process. It controls the output speed of the first-stage planetary carrier to be at a low speed, and then through the second-stage speed-increasing planetary gear train, it increases the speed of the first-stage planetary carrier from a low speed 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 operates with "one input and two outputs," the motion mode is a decomposed motion. Engine power is input to the first-stage sun gear, and the power is split to the first-stage internal ring gear and the first-stage planetary carrier. The first-stage internal ring gear and the first-stage planetary carrier are the power output ends of the first-stage differential planetary gear train. Decomposed motion means that motion or power can be synthesized from one input shaft and transmitted to the other two output shafts. By changing the proportion of motion decomposition, stepless speed regulation of the output shafts is achieved; that is, by changing the load on the speed regulating motor, adjustable stepless speed change of the gear transmission system is realized.

[0022] 5. When the first-stage differential planetary gear train operates with "two inputs and one output," the motion is a composite motion. Engine power is input to the first-stage sun gear, and the speed-regulating motor power is input to the first-stage internal ring gear. The two input powers merge and flow to the first-stage planet carrier, which serves as the power output end of the first-stage differential planetary gear train. This composite motion means that motion or power can be transmitted from two input shafts to another output shaft. By changing the input speed and direction of rotation of the two input components, stepless speed regulation of the output shaft is achieved. In other words, by changing the input speed and direction of rotation of the speed-regulating motor, adjustable stepless speed change of the gear transmission system is realized. Attached Figure Description

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

[0024] Figure 2 This is a cross-sectional view of the gear transmission system of the present invention.

[0025] In the diagram: First-stage differential planetary gear train (01), speed regulating section (02), external spline shaft (04), second-stage speed-increasing planetary gear train (03), input shaft (0101), first-stage sun gear (0102), several first-stage planetary gears (0103), several first-stage planetary gear pins (0104), first-stage internal gear ring (0105), several first-stage planetary gear bearings (0106), first-stage internal gear ring bearing I (0107), first-stage internal gear ring bearing II (0108), first-stage bearing housing (0109), first-stage planetary carrier (0110), first-stage planetary carrier bearing I (0111), first-stage planetary carrier bearing II (0112), input shaft bearing I (0113), input shaft bearing II (0114), large bevel gear I (0115). 5) Small bevel gear I (0116), small bevel gear bearing I (0117), small bevel gear bearing II (0118), bevel gear bearing housing (0119), end cover (0120), large bevel gear II (0201), small bevel gear II (0202), speed regulating motor (0203), second stage internal gear ring (0301), 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), second stage planetary carrier (0306), second stage sun gear (0307), output shaft (0308), output shaft bearing I (0309), output shaft bearing II (0310), second stage bearing housing (0311), and casing (0312). Detailed Implementation

[0026] The present invention will be further described below with reference to embodiments, but it should not be construed that the scope of the present invention is limited to the following embodiments. Various substitutions and modifications made based on ordinary technical knowledge and common practices in the art without departing from the above-described technical concept of the present invention should be included within the scope of protection of the present invention.

[0027] Example 1:

[0028] A planetary gear transmission system for aero-engines capable of continuously variable transmission, characterized in that:

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

[0030] The first-stage differential planetary gear train (01) includes a planetary gear train consisting of a first-stage sun gear (0102), several first-stage planet gears (0103), a first-stage internal gear ring (0105), and a first-stage planet carrier (0110), as well as the 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 consisting of a second-stage internal gear ring (0301), several second-stage planetary gears (0303), a second-stage planetary carrier (0306), a second-stage sun gear (0307), and the 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 planetary 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 control system (02) includes a speed control motor (0203) and a transmission gear train; the shaft of the speed control motor (0203) is connected to the first internal gear ring (0105) of the first stage differential planetary gear train (01) through the transmission gear train;

[0033] During operation, the following working conditions apply:

[0034] "One input, two outputs": The speed-regulating motor (0203) is the load, which is the 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 planetary carrier (0110) are the power output ends of the first-stage differential planetary gear system (01); by changing the load size of the speed-regulating motor (0203), the adjustable stepless speed change of the second-stage sun gear (0307), which is the entire transmission system, is realized;

[0035] "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 internal 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), which serves as the entire transmission system, is realized.

[0036] It is worth noting that, in use, the high-pressure rotor of the aero-engine is splinedly connected to the input shaft (0101) of the first-stage differential planetary gear system (01); the ducted fan rotor of the aero-engine is splinedly connected to the output shaft (0308) of the second-stage speed-increasing planetary gear system (03); the spline structure inside 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 employ NGW-type planetary gear trains, with a number of planetary gears in each stage. The first-stage differential planetary gear train (01) is a deceleration process, controlling the output speed of the first-stage planetary carrier (0110) to a low speed. The second-stage speed-increasing planetary gear train (02) is a fixed-axis gear train, increasing the speed of the first-stage planetary carrier (0110) from a low speed to the required speed. The number of planetary gears in the two-stage planetary gear trains can be adjusted according to the transmission power. The above design in this embodiment ensures that the gear transmission system has a compact structure and smaller size and weight.

[0038] Example 2:

[0039] An aviation-4 type capable of continuously variable transmission

[0040] Engine planetary gear transmission system

[0041] The main structure of this embodiment is the same as that of Embodiment 1. Furthermore, during specific installation, the input shaft (0101) and the first-stage sun gear (0102) are connected by a spline and have a floating dimension in the axial direction; the output shaft (0308) and the second-stage sun gear (0307) are connected by a spline and have a floating dimension in the axial direction; the spline fit structure can have floating margins in the axial and radial directions, which can improve the load-sharing capacity of the sun gear in the planetary gear system in the circumferential direction.

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

[0043] The first-stage bearing housing (0109) is equipped with a first-stage internal gear ring bearing I (0107), a first-stage internal gear ring bearing II (0108), a first-stage planetary carrier bearing II (0112), and an input shaft bearing I (0113). The outer ring of the first-stage internal gear ring bearing I (0107) is fitted into the first-stage bearing housing (0109); the inner ring of the first-stage internal gear ring bearing II (0108) is fitted into the first-stage internal gear ring bearing I (0107); the outer ring of the first-stage planetary carrier bearing II (0112) is fitted into the first-stage internal gear ring bearing I (0107); the outer ring of the input shaft bearing I (0113) is fitted into 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 with the input shaft (0101), and the outer ring of the input shaft bearing II (0114) is fitted with the input shaft (0101); the first stage sun gear (0102) is splined to the input shaft (0101); the plurality of first stage planetary pins (0104) are supported between the first stage internal gear ring (0105) and the first stage sun gear (0102) by the first stage planetary carrier (0110); the plurality of first stage planetary pins (0104) are arranged around the first stage sun gear (0102); A plurality of first-stage planetary gears (0103) are mounted on first-stage planetary pins (0104) via first-stage planetary gear bearings (0106); the plurality of first-stage planetary pins (0104), the plurality of first-stage planetary bearings (0106), and the plurality of first-stage planetary gears (0104) constitute the shaft system of the first-stage planetary gears; the plurality of first-stage planetary gears (0103) externally mesh with the first-stage sun gear (0102); the plurality of first-stage planetary gears (0103) internally mesh 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 connected to small bevel gear bearing I (0117) and small bevel gear bearing II (0117). The inner ring of the small bevel gear bearing I (0118) is fitted and installed; the outer ring of the small bevel gear bearing I (0117) is installed on the housing (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 housing (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 against the outer ring of the small bevel gear bearing II (0118) to prevent the small bevel gear bearing II (0118) from moving axially; the large bevel gear (0115) meshes with the small bevel gear (0116) externally, and the shaft angle is 90°;The left and right sides of the first-stage planetary carrier (0110) are fitted with the inner rings of the first-stage planetary carrier bearing I (0111) and the first-stage planetary carrier bearing II (0112); the outer ring of the first-stage planetary carrier bearing II (0112) is fitted with the casing (0312).

[0044] The first-stage planetary carrier (0110) and the second-stage internal gear ring (0301) are designed with internal splines, which are splined to the external spline shaft (04); the internal spline relief groove of the first-stage planetary carrier (0110) and the second-stage internal gear ring (0301) is designed with steps to limit the axial movement of the external spline shaft (04).

[0045] The casing (0312) is a cylindrical structure with open ends and a hollow interior; the front opening of the casing (0312) is sealed by a first-stage bearing seat (0109); the rear opening of the casing (0312) is sealed by a second-stage bearing seat (0311); the second-stage bearing seat (0311) and the second-stage planetary carrier (0306) are fixed to the casing (0312) with bolts;

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

[0047] The plurality of second-stage planetary pins (0305) are supported between the second-stage internal gear ring (0301) and the second-stage sun gear (0307) by the second-stage planetary carrier (0306); the plurality of second-stage planetary pins (0305) are arranged around the second-stage sun gear (0307); the second-stage planetary gears (0303) are sleeved on the second-stage planetary pins (0305) by the second-stage planetary gear bearings (0304); the plurality of second-stage planetary pins (0305), the plurality of second-stage planetary gear bearings (0304), and the plurality of second-stage planetary gears (0303) constitute the shaft system of the second-stage planetary gears; the plurality of second-stage planetary gears (0305) are supported between the second-stage internal gear ring (0301) and the second-stage sun gear (0307) by the second-stage planetary carrier (0306); 03) Externally meshing with the second-stage sun gear (0307); the plurality of second-stage planetary gears (0303) internally meshing 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) and the output shaft (0308) are connected by a spline; the outer ring of the output shaft bearing II (0310) is fitted and installed with the second-stage planetary carrier (0306); the outer ring of the output shaft bearing I (0309) is fitted and installed with the second-stage bearing housing (0311);

[0048] Example 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 the large bevel gear (0115) that meshes with the small bevel gear (0116). The rotation axis of the first-stage internal gear ring (0105) is the rotation angle of the large bevel gear (0115). The large bevel gear (0115) meshes with the small bevel gear (0116) and the shaft angle is 90°. The small bevel gear (0116) and the rotation axis of the speed regulating motor (0203) are transmitted through the transmission gear system.

[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) is coaxial with the large bevel gear II (0201); the small bevel gear II (0202) meshes externally with the large bevel gear II (0201); the small bevel gear II (0202) is coaxial with the speed regulating 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 regulating motor.

[0051] It is worth noting that, in the embodiments, 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 operating conditions of the aircraft engine to achieve stepless speed change.

[0052] In the "one input, two outputs" operating condition (when the aero-engine requires the gear transmission system to perform disassembled motion), the engine power is input through the input shaft (0101). The input shaft (0101) and the first-stage sun gear (0102) are connected by a spline. Power is split from the first-stage sun gear (0102) to the first-stage internal gear ring (0105) and the first-stage planetary carrier (0110). A portion of the power is output from the first-stage internal gear ring (0105), passing through the large bevel gear I (0115) and the small bevel gear I. (0116), large bevel gear II (0201), and small bevel gear II (0202) transmit power to the speed regulating motor (0203). 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 planetary carrier (0110) through the external spline shaft (04) to the second-stage speed increaser planetary gear system (03) for speed increase output. This ensures that the engine is in ideal working condition, and only the speed regulating motor (0203) is changed to change the load size, so as to realize stepless speed change of the gear transmission system.

[0053] In the "two-input, one-output" operating condition (when the aero-engine requires a gear transmission system to perform composite motion), one 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 connected by a spline. Power is transmitted from the first-stage sun gear (0102) to the first-stage planetary gear (0103). The other part of the power is from the speed regulating motor (0203), through the small bevel gear II (0202), the large bevel gear II (0201), and the small bevel gear. I(0116), large bevel gear I(0115) and first-stage internal gear ring (0105) are transmitted to the first-stage planetary gear (0103). The two parts are combined at the first-stage planetary gear (0103) and then transmitted to the second-stage speed-increasing planetary gear system (03) through the first-stage planetary carrier (0110) and external spline shaft (04) for speed-increasing output. This ensures that the engine, under ideal working conditions, only changes the input speed and input rotation direction of the speed regulating motor (0203) to achieve stepless speed change of the gear transmission system.

Claims

1. A planetary gear transmission system for an aero-engine capable of continuously variable transmission, characterized in that: It includes a first-stage differential planetary gear train (01) and a second-stage speed-increasing planetary gear train (03) installed inside the gearbox, as well as a speed control system (02). The first-stage differential planetary gear train (01) includes a planetary gear train consisting of a first-stage sun gear (0102), several first-stage planetary gears (0103), a first-stage internal gear ring (0105), and a first-stage planetary carrier (0110), as well as the 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 planetary carrier (0110) is the power output end of the first-stage differential planetary gear train (01); The second-stage speed-increasing planetary gear train (03) includes a planetary gear train consisting of a second-stage internal gear ring (0301), several second-stage planetary gears (0303), a second-stage planetary carrier (0306), a second-stage sun gear (0307), and the 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 planetary 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; The speed control system (02) includes a speed control motor (0203) and a transmission gear train; the transmission gear train includes a small bevel gear II (0202) and a large bevel gear II (0201); the shaft of the speed control motor (0203) is connected to the first internal gear ring (0105) of the first stage differential planetary gear train (01) through the transmission gear train; During operation, the following working conditions apply: "One input, two outputs": The speed-regulating motor (0203) is the load, which is the generator; the engine power input is to the first-stage sun gear (0102), and the first-stage internal gear ring (0105) and the first-stage planetary carrier (0110) are the power output ends of the first-stage differential planetary gear system (01); by changing the load size of the speed-regulating motor (0203), the adjustable stepless speed change of the second-stage sun gear (0307), which is the entire transmission system, is realized; "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 internal 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), which serves as the entire transmission system, is realized.

2. The planetary gear transmission system for an aero-engine capable of continuously variable transmission according to claim 1, characterized in that: The first-stage internal gear ring (0105) has bevel teeth on its outer side, making the first-stage internal gear ring (0105) equivalent to a large bevel gear (0115) that meshes externally with the small bevel gear (0116). The rotation axis of the first-stage internal gear ring (0105) is the rotation angle of the large bevel gear (0115). The large bevel gear (0115) meshes externally with the small bevel gear (0116), and the shaft angle is 90°. The small bevel gear (0116) and the rotation axis of the speed regulating motor (0203) are transmitted through the transmission gear system.

3. The planetary gear transmission system for an aero-engine capable of continuously variable transmission according to claim 1, characterized in that: The small bevel gear (0116) is coaxial with the large bevel gear II (0201); the small bevel gear II (0202) meshes externally with the large bevel gear II (0201); the small bevel gear II (0202) is coaxial with the speed-regulating motor (0203), 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.

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

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