A large torque output electric drive variable pitch propeller device

Abstract

The application discloses a large-torque-output electric-drive variable-pitch propeller device, which comprises a blade, a variable-pitch assembly, a flange cover plate, a transmission shaft and a hub; the variable-pitch assembly comprises a motor assembly, a planetary gear pair, n worm-gear pairs and a blade root metal assembly; the planetary gear pair comprises a sun gear and n planetary gears, and the sun gear and the planetary gears are fixedly connected; the planetary gears and the worm-gear pairs are in one-to-one correspondence. The blade is disassembled and assembled outside a side cavity of the hub and cooperates with the variable-pitch assembly; the sun gear of the planetary gear set is driven to rotate by the motor, the planetary gears and the worm gears are driven to rotate together, and the rotation of the blade is realized by the transmission mode of the worm gears to realize variable pitch. The device is convenient to disassemble and assemble, can realize end self-locking, has high control precision and can provide large variable-pitch torque.

Description

TECHNICAL FIELD

[0001] The application belongs to the field of aviation equipment, and particularly relates to an electric drive variable-pitch propeller device with large torque output. BACKGROUND

[0002] At present, the driving mode of the existing variable-pitch propeller device with large torque output at home and abroad is all hydraulic driving, and the motor driving is limited in application range due to space limitation and transmission mode selection, resulting in small driving force. With the continuous expansion of the general aviation market, the use frequency of propellers is higher and higher, and higher requirements are put forward for maintenance, weight and size, and replacement of consumable parts. It is hoped that the maintenance is convenient, the weight and size on the aircraft are as small as possible, and the consumable parts can be easily replaced. The hydraulic driving is still more complex than the motor driving in maintenance. SUMMARY

[0003] The technical problem of the application is to overcome the shortcomings of the prior art and provide an electric drive variable-pitch propeller device with large torque output, which is convenient to maintain, has small weight and size on the aircraft, and can easily replace consumable parts.

[0004] The technical solution of the application is:

[0005] The electric drive variable-pitch propeller device with large torque output comprises a blade, a variable-pitch assembly, a flange cover plate, a transmission shaft and a hub.

[0006] The variable-pitch assembly comprises a motor assembly, a planetary gear pair, n worm gear pairs and a blade root metal assembly. The planetary gear pair comprises a sun gear and n planet gears, and the sun gear and the planet gears are in transmission connection. The planet gears and the worm gear pairs are in one-to-one correspondence. Each worm gear pair comprises a worm gear and a worm, and the worm and the worm gear are in transmission connection. The blade root metal assembly comprises a blade root metal part, a third supporting bearing, a fourth supporting bearing and a thrust bearing.

[0007] The hub is a hollow structure, and the flange cover plate, the transmission shaft, the planetary gear pair and the worm gear pair are located in the hollow cavity of the hub.

[0008] The motor output shaft of the motor assembly is fixedly connected with the transmission shaft, the transmission shaft is supported on the flange cover plate through a first supporting bearing, the sun gear is sleeved on the transmission shaft, each planet gear is sleeved on the worm of the corresponding worm gear pair, the rotation axes of the planet gear and the worm of the corresponding worm gear pair are collinear, and the worm is supported on the inner wall of the hub through a second supporting bearing. The blade root metal part is fixedly connected with the worm gear and supported in the side cavity of the hub through the third supporting bearing, the fourth supporting bearing and the thrust bearing, and the blade is fixedly connected with the blade root metal part.

[0009] Preferably, the blade root metal assembly further comprises a taper ring and a fixing ring.

[0010] The conical ring is a split structure, the conical ring is sleeved on the blade, the overall structure composed of the conical ring and the blade is inserted into the metal piece of the blade root, and the fixing ring is sleeved on the outside of the metal piece of the blade root and the blade to further fix the metal piece of the blade root and the blade.

[0011] Preferably, two L-shaped grooves are machined on the side end of the metal piece of the blade root close to the flange cover plate, and a limiting block with a slope is arranged in each groove; the stop rod is threadedly connected with the flange cover plate, the length of the stop rod protruding downward is adjusted by the length of the screwing, and the nut is connected at the top end of the stop rod and locks the adjusted position of the stop rod to prevent vibration.

[0012] Preferably, the two L-shaped grooves machined on the side end of the metal piece of the blade root close to the flange cover plate are arranged in a circular arc along the rotation axis of the metal piece of the blade root, and the slope surfaces of the two limiting blocks are placed opposite to each other, the stop rod and the two limiting blocks are used to limit the rotation angle of the metal piece of the blade root, and the rotation angle range of the metal piece of the blade root is ensured to be greater than the actual pitch angle movement range.

[0013] Preferably, the metal piece of the blade root is connected from inside to outside of the hub side cavity, a first protrusion is designed on the outer wall of the metal piece of the blade root, a second protrusion is designed in the hub side cavity, the first protrusion is located inside the second protrusion, and the thrust bearing is installed between the first protrusion and the second protrusion, so that the first protrusion transmits force to the second protrusion of the hub through the thrust bearing under the action of centrifugal force.

[0014] Preferably, the motor assembly comprises a motor, a speed reducer, an encoder and a flange sleeve, the motor output shaft is fixedly connected with the transmission shaft, the motor, the speed reducer and the encoder are installed on the motor, the motor is fixed on the flange sleeve, and the flange sleeve is fixed on the flange cover plate.

[0015] Preferably, the variable-pitch assembly further comprises a motor shield, the motor shield covers the flange sleeve of the motor assembly, and the bottom of the motor shield is fixedly connected with the hub.

[0016] Preferably, the size of the motor shield matches the size of the motor, so that the motor is protected and the hub is sealed.

[0017] Preferably, the central axis of the flange cover plate is perpendicular to the rotation axis of the blade and is collinear with the rotation axis of the sun gear of the planetary gear pair, and the flange cover plate uniformly distributes bearing holes for positioning the planet wheels and the worm.

[0018] Preferably, the variable-pitch assembly further comprises a locking ring, which is threadedly connected with the metal piece of the blade root and sleeved on the metal piece of the blade root; the locking ring is sealingly connected with the hub side cavity through a sealing ring.

[0019] Preferably, the variable-pitch assembly further comprises a potentiometer, the rotor of the potentiometer is fixedly connected with the upper end of the worm, the stator of the potentiometer is fixedly connected with the flange cover plate, and the potentiometer obtains the pitch angle change angle of the blade by measuring the rotation angle of the worm.

[0020] Compared with the prior art, the technical beneficial effects of the present application are:

[0021] In order to realize the requirement of large pitch force of the propeller, the present application designs a variable pitch mechanism of the electric drive planetary gear pair and the worm gear pair, and provides an electric drive variable pitch propeller device with large torque output; in order to ensure the accurate change of the propeller pitch angle, a combination of fixed reduction ratio, motor assembly with encoder and end encoder closed loop control is adopted; in order to prevent the fluctuation of the propeller pitch angle under the action of aerodynamic force, the worm gear pair structure is adopted to lock the propeller angle; in order to facilitate the maintenance of the propeller, the variable pitch assembly of the propeller is modularly designed, and the damaged propeller and motor can be replaced at any time without disassembling the variable pitch assembly, so that the consumable parts can be easily replaced; in order to optimize the stress of the propeller root metal part, the propeller root metal part is designed and installed from inside to outside, which meets the requirement of propeller centrifugal force bearing; by setting the limiting block and the adjustable range of the stop lever on the propeller root metal part, the mechanical limiting of the propeller pitch angle change is set and the range is adjustable, which ensures the motion safety of the propeller and the adjustment requirement of different propeller pitch angle ranges under different working conditions.

[0022] The electric drive mode adopted in the present application can save the hydraulic cylinder, speed regulator and other equipment, hydraulic oil and pipeline system, greatly simplify the structure of the mechanism, and greatly reduce the weight, thereby reducing the load of the aircraft. BRIEF DESCRIPTION OF DRAWINGS

[0023] Figure 1 It is a perspective view of the electric drive variable pitch propeller device with large torque output.

[0024] Figure 2 It is a structure composition diagram of the motor assembly, planetary gear pair and worm gear pair.

[0025] Figure 3 It is a transmission and limiting structure composition diagram of the electric drive variable pitch propeller device.

[0026] Figure 4 It is a mechanical limiting structure composition diagram of the propeller root metal part. DETAILED DESCRIPTION

[0027] The present application will be further described in detail below with reference to the accompanying drawings.

[0028] In order to realize the large pitch force requirement of the propeller, the electric drive planetary gear pair and the variable pitch mechanism of the worm gear pair are designed, and a large torque output electric drive variable pitch propeller device is provided; in order to ensure the accurate change of the propeller pitch angle, the fixed reduction ratio and the motor assembly with encoder are adopted; in order to prevent the fluctuation of the propeller pitch angle under the aerodynamic force, the worm gear pair structure is adopted to lock the propeller angle; in order to facilitate the maintenance of the propeller, the variable pitch assembly of the propeller is modularly designed, and the damaged propeller and motor can be replaced at any time without disassembling the variable pitch assembly; in order to optimize the stress of the propeller root metal part, the propeller root metal part is designed from inside to outside and installed, which meets the requirement of propeller centrifugal force bearing. By setting the limiting block on the propeller root metal part, the mechanical limiting of the propeller pitch angle change is set, and the safety of the propeller movement is ensured.

[0029] Referring to Figure 1 , Figure 2 and Figure 3 , a large torque output electric drive variable pitch propeller device, comprising a propeller blade 1, a variable pitch assembly, a propeller hub 5 and a motor shield 3, the variable pitch assembly comprising a motor assembly 2, a planetary gear pair, three worm gear pairs and a propeller root metal assembly, the motor assembly 2 comprising a motor, a reducer and an encoder, which is fixed on the flange cover 4. The propeller root metal assembly comprises a propeller root metal part 7, a fixed ring 8, a taper ring 9, a support bearing 6, a support bearing 12 and a thrust bearing 11. The output shaft of the motor is fixedly connected with the transmission shaft 19, the transmission shaft 19 is supported on the flange cover plate 17 through the bearing 18, the flange cover plate 17 is fixedly connected with the propeller hub 5, one end of the transmission shaft 19 is fixedly connected with the sun gear 16 of the planetary gear pair. The output shaft of the motor rotates to drive the sun gear 16 and the planetary gear 15 of the planetary gear pair to rotate. The planetary gear and the worm gear pair correspond one-to-one, the planetary gear 15 and the corresponding worm gear pair worm 14 are fixedly connected, the rotation axes are collinear, and are supported on the propeller hub 5 through the bearing 20. The rotation of the worm 14 drives the worm gear 13 to rotate, the propeller root metal part 7 is fixedly connected with the worm gear 13, the propeller root metal part 7 is installed from inside to outside through the propeller hub side cavity, is supported by the support bearing 6, the support bearing 12 and the thrust bearing 11 through the propeller hub 5 side cavity wall surface, and can rotate, while the propeller blade 1 is fixedly connected with the propeller root metal part 7 through the taper ring 9 and the fixed ring 8, and realizes variable pitch movement with the rotation of the propeller root metal part 7. Specifically, the taper ring 9 is a split structure, the taper ring 9 is sleeved on the propeller blade 1, the whole structure composed of the taper ring 9 and the propeller blade 1 is inserted into the propeller root metal part 7, and the fixed ring 8 is sleeved on the outer side of the propeller root metal part 7 and the propeller blade 1 to further fix the propeller root metal part 7 and the propeller blade 1.

[0030] In order to limit and monitor the pitch angle change of the blade 1, two L-shaped grooves are arranged at the inner end of the blade root metal piece 7 for placing the slope limiting block 21, and the stop rod 22 is threadedly connected with the flange cover plate 17, the length of the stop rod 22 protruding downward is adjusted by the screwing length, the nut 23 is connected at the top end of the stop rod 11, and the adjusted position of the stop rod 22 is locked and fixed to prevent vibration.

[0031] The two L-shaped grooves arranged at the side end of the blade root metal piece 7 close to the flange cover plate 17 are arranged in a circular arc along the rotation axis of the blade root metal piece 7, and the slope surfaces of the two limiting blocks 21 are placed opposite to each other, the stop rod 22 and the two limiting blocks are used to limit the rotation angle of the blade root metal piece 7, and the rotation angle range of the blade root metal piece 7 is greater than the actual pitch angle movement range.

[0032] As shown in Figure 4 When the blade root metal piece 7 rotates, the bottom end of the stop rod 22 interferes with the A surface and the B surface of the limiting block 21 respectively, so as to limit the rotation angle range of the blade root metal piece 7, and the rotation angle range of the blade root metal piece 7 is greater than the actual pitch angle movement range.

[0033] For example, the actual pitch angle movement range of the blade is 8-30 degrees, and the movement range of the stop rod without interference is 6-32°, which ensures that the actual movement range does not exceed too much.

[0034] The rotor of the potentiometer 24 is fixedly connected with the upper end of the worm 14, and the stator of the potentiometer 24 is fixedly connected with the flange cover plate 17, so as to indirectly obtain the pitch angle change angle of the blade 1 by measuring the rotation angle of the worm.

[0035] The size of the motor shield 3 matches the diameter and length of the motor, and the motor shield 3 is fixedly connected with the hub 5, so as to realize the protection of the motor and the sealing of the hub 5.

[0036] The protrusion of the blade root metal piece 7 cooperates with the thrust bearing 11, and under the action of the rotating centrifugal force, the centrifugal force of the blade is transmitted to the hub 5, the installation mode is that the blade root metal piece 7 is connected from inside to outside of the hub side cavity, the first protrusion is designed on the outer wall of the blade root metal piece 7, the second protrusion is designed in the hub side cavity, the first protrusion is located inside the second protrusion (from the figure, the first protrusion is located on the right side of the second protrusion), the thrust bearing 11 is installed between the first protrusion and the second protrusion, and under the action of the centrifugal force, the first protrusion transmits the force to the hub second protrusion through the thrust bearing. The worm and gear pair includes a worm wheel 13 and a worm 14, has a self-locking function, and can realize the limit change range of the pitch angle of the blade 1 by limiting the movement range of the worm wheel 13.

[0037] The middle axis of the flange cover plate 17 is perpendicular to the rotation axis of the blade 1 and is collinear with the rotation axis of the sun gear 16 of the planetary gear pair, and three bearing holes for positioning the planetary gears 15 and the worm 14 are uniformly distributed at a certain radius from the middle axis. The locking ring 10 is axially positioned on the blade metal part 7 by screwing with the blade metal part 7 and is sealed with the side cavity wall surface of the hub 5 through a sealing ring. When the worm wheel 13 is installed, it can be installed from the outside to the inside of the inner cavity of the blade metal part 7, and the inner end surface of the blade metal part 7 is preferably hollow.

[0038] The wire rods 25 are uniformly distributed along the rotation axis of the propeller, and the number of the wire rods 25 is consistent with the number of the worm gear pair. The cable of the motor assembly 2 and the potentiometer 24 is connected with the on-board power supply through the hollow wire rods 25, avoiding the exposure of the cable outside the propeller.

[0039] The force transmission and motion path of the device is motor-planetary gear pair-worm gear pair-blade, and the reduction ratio is fixed. The closed-loop control of the pitch angle change of the blade 1 can be realized through the encoder of the motor assembly 2 and the potentiometer 24.

[0040] The application discloses a large-torque-output electric-drive variable-pitch propeller device, and mainly aims at solving the problem that an electric-drive propeller cannot provide a large variable-pitch torque to match the demand of a large-thrust engine. The main body of the device comprises a blade, a variable-pitch assembly and a hub, the blade is disassembled and assembled outside the side cavity of the hub and cooperates with the variable-pitch assembly, a sun gear of a planetary gear set is driven to rotate by a large-torque motor, the planetary gear and a worm are driven to rotate together, and the rotation of the blade is realized by the transmission mode of the worm gear to realize variable pitch. The blade is installed from outside to inside of the side cavity of the hub, the blade root metal part and the variable-pitch mechanism are installed from inside to outside of the side cavity of the hub, the hub and the variable-pitch mechanism are integrally designed, the blade is separately designed and directly connected and installed, and the device is modularized and convenient to install and maintain. The device is convenient to disassemble and assemble, can realize end self-locking, has high control precision and can provide a large variable-pitch torque.

[0041] Any feature in the present description, unless explicitly stated, can be replaced by alternative features serving the same, equivalent or similar purpose. That is, unless explicitly stated, any feature is one example only of a number of alternative or comparable features.

[0042] The application is not restricted to the specific embodiments described hereinbefore. The application extends to any novel one, or any novel combination, of the features disclosed in this specification, and to any novel method or process disclosed, or any novel combination of steps of the disclosed methods or processes.

[0043] The contents not described in detail in the specification of the application are the known technology of the skilled in the art.

Claims

1. A high torque output electric drive variable pitch propeller apparatus characterised in that: The propeller (1), the variable pitch assembly, the flange cover plate (17), the transmission shaft (19), and the propeller hub (5); The variable pitch assembly comprises a motor assembly (2), a planetary gear pair, n worm gear pairs, and a propeller root metal assembly, the planetary gear pair comprises a sun gear (16) and n planetary gears (15), the sun gear (16) and the planetary gears (15) are in transmission connection; the planetary gears and the worm gear pairs are in one-to-one correspondence; each worm gear pair comprises a worm wheel (13) and a worm (14), the worm (14) and the worm wheel (13) are in transmission connection; the propeller root metal assembly comprises a propeller root metal piece (7), a third support bearing (6), a fourth support bearing (12), and a thrust bearing (11); The propeller hub (5) is a hollow structure, the flange cover plate (17), the transmission shaft (19), the planetary gear pair, and the worm gear pair are located in the hollow cavity of the propeller hub (5); The motor output shaft of the motor assembly (2) is fixedly connected with the transmission shaft (19), the transmission shaft (19) is supported on the flange cover plate (17) through a first support bearing (18); the sun gear (16) is sleeved on the transmission shaft (19); each planetary gear (15) is sleeved on the worm (14) of the corresponding worm gear pair, and the rotation axes of the planetary gear (15) and the worm (14) of the corresponding worm gear pair are collinear, the worm (14) is supported on the inner wall of the propeller hub (5) through a second support bearing (20); the propeller root metal piece (7) is fixedly connected with the worm wheel (13) and is supported in the side cavity of the propeller hub (5) through the third support bearing (6), the fourth support bearing (12), and the thrust bearing (11), and the propeller blade (1) is fixedly connected with the propeller root metal piece (7); The propeller root metal assembly further comprises a taper ring (9) and a fixing ring (8); The taper ring (9) is a split structure, the taper ring (9) is sleeved on the propeller blade (1), the whole structure composed of the taper ring (9) and the propeller blade (1) is inserted into the propeller root metal piece (7), and the fixing ring (8) is sleeved outside the propeller root metal piece (7) and the propeller blade (1) to further fix the propeller root metal piece (7) and the propeller blade (1); Two L-shaped grooves are formed on the side end of the propeller root metal piece (7) close to the flange cover plate (17), and one limiting block (21) with a slope is arranged in each groove; the stop rod (22) is threadedly connected with the flange cover plate (17), the length of the stop rod (22) protruding downward is adjusted by the length of the screwing, and the nut (23) is connected with the top end of the stop rod (22) and locks the position of the stop rod (22) to prevent vibration; The two L-shaped grooves formed on the side end of the propeller root metal piece (7) close to the flange cover plate (17) are arranged in a circular arc along the rotation axis of the propeller root metal piece (7), and the slope surfaces of the two limiting blocks (21) are oppositely arranged, the stop rod (22) and the two limiting blocks are used to limit the rotation angle of the propeller root metal piece (7), and the rotation angle range of the propeller root metal piece (7) is ensured to be greater than the actual pitch angle movement range. Potentiometer (24) is also included, the rotor of potentiometer (24) is fixed with the upper end of worm (14), the stator of potentiometer (24) is fixed with flange cover plate (17), and the pitch angle change angle of blade (1) is obtained by measuring the rotation angle of worm through potentiometer (24).

2. A high torque output electrically driven variable pitch propeller apparatus according to claim 1, characterised in that: The paddle root metal piece (7) is connected with the hub from inside to outside of the hub side cavity, the first protrusion is designed on the outer wall of the paddle root metal piece (7), the second protrusion is designed in the hub side cavity, the first protrusion is located inside the second protrusion, and the thrust bearing (11) is installed between the first protrusion and the second protrusion, and the first protrusion transmits force to the second protrusion of the hub through the thrust bearing under the action of centrifugal force.

3. A high torque output electrically driven variable pitch propeller apparatus according to claim 1, wherein: The motor assembly (2) includes a motor, a reducer, an encoder and a flange sleeve (4), the motor output shaft is fixed with the transmission shaft (19), the motor, the reducer and the encoder are installed on the motor, the motor is fixed on the flange sleeve (4), and the flange sleeve (4) is fixed on the flange cover plate (17).

4. A high torque output electrically driven variable pitch propeller apparatus according to claim 3 wherein: The variable pitch assembly further includes a motor shield (3), the motor shield (3) covers the flange sleeve (4) of the motor assembly (2), and the bottom of the motor shield (3) is fixed with the hub (5).

5. A high torque output electrically driven variable pitch propeller apparatus according to claim 4 wherein: The size of the motor shield (3) matches the size of the motor, so that the motor is protected and the hub (5) is sealed.

6. A high torque output electrically driven variable pitch propeller apparatus according to claim 1, wherein: The central axis of the flange cover plate (17) is perpendicular to the rotation axis of the blade (1) and is collinear with the rotation axis of the sun gear (16) of the planetary gear pair, and the flange cover plate (17) uniformly distributes bearing holes for positioning the planetary gear (15) and the worm (14).

7. A high torque output electrically driven variable pitch propeller apparatus according to claim 1, wherein: The locking ring (10) is also included, which is screwed with the paddle root metal piece (7) and is sleeved on the paddle root metal piece (7); the locking ring (10) is sealed and matched with the side cavity of the hub (5) through a sealing ring.

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