Power transmission device for testing performance of coaxial contra-rotating propeller

Abstract

The invention provides a power transmission device for testing the performance of a coaxial contra-rotating propeller. According to the transmission device, power is transmitted to a compound planetary gear box through a power input device, a coupler, a torque rotating speed sensor and the coupler, the power is accelerated through an accelerating gear transmission unit of the compound planetary gear box, and then the power is differentially shunted to an output outer shaft and an output inner shaft through a differential planet unit, and the output inner shaft is connected with the front propeller hub unit. The inner gear ring is connected with the output outer shaft, and the output outer shaft is connected with the rear propeller hub unit. By adjusting the propeller pitch of the propellers on one propeller hub unit, it is guaranteed that the output state of the power input device is not changed, and meanwhile the rotating speed of the two output shafts is changed. Or by adjusting the propeller pitch of the propellers on the two propeller hub units, it is guaranteed that the output state of the power input device is not changed, and meanwhile the rotating speed of the two output shafts is changed. And the speed change of the front and rear propeller hub shafts can be realized by controlling the output rotating speed of the power input device under the condition that the propeller pitches of the front and rear propellers are not changed.

Description

Technical Field

[0001] The invention relates to the technical field of aviation equipment testing, and in particular to a power transmission device for coaxial counter-rotating propeller performance testing. Background Art

[0002] Propeller aircrafts have single propeller structures and coaxial counter-rotating propeller structures. Compared with aircrafts with single propellers, aircrafts with coaxial counter-rotating propeller structures have the following advantages: they almost completely eliminate the reaction torque and gyroscopic torque of the propeller, improve the maneuverability, lateral and longitudinal stability of the aircraft, and facilitate the take-off of the aircraft; they can reduce the swirl effect of the air behind the propeller, making the airflow through the aircraft more uniform, and improve the efficiency of the propeller, making the overall size of the aircraft more compact and reducing the weight of the aircraft. Especially for military aircrafts, when the power input of the aircraft is greater than a certain value, it is very difficult to use a single propeller to maintain the high-efficiency output of the propeller. Therefore, it is necessary to consider the use of a coaxial counter-rotating double propeller structure. The design test of the coaxial counter-rotating propeller has a very important practical demand, so a test transmission device that can effectively test the performance of the coaxial counter-rotating propeller is needed. Summary of the invention

[0003] The purpose of the present invention is to provide a power transmission device for testing the performance of coaxial counter-rotating propellers to solve the problems existing in the prior art.

[0004] The technical solution adopted to achieve the purpose of the present invention is as follows: a power transmission device for coaxial counter-rotating propeller performance testing includes a power input device, an input shaft, a compound planetary gearbox and a hub unit with variable pitch control connected in sequence.

[0005] The motor shaft of the power input device is connected to the input shaft through a coupling I. A torque speed sensor is arranged on the shaft body of the input shaft. The input shaft is connected to the compound planetary gearbox through a coupling II.

[0006] The compound planetary gearbox includes a speed increasing gear transmission unit and a differential planetary unit. The differential planetary unit includes a floating sun gear, a planet carrier bearing, a plurality of planetary pins, a plurality of planetary wheel bearings, a plurality of planetary wheels, an inner gear ring, an intermediate housing, an output bearing seat, an output outer shaft, an output inner shaft, a locking nut and a planet carrier.

[0007] The intermediate housing is a cylindrical structure with open ends and a hollow interior. The front end of the intermediate housing is sealed by an intermediate connecting plate. A through hole is provided in the center of the intermediate connecting plate. The output shaft of the speed-increasing gear transmission unit passes through the through hole of the intermediate connecting plate and then extends into the intermediate housing. The intermediate connecting plate has a receiving groove for the planetary carrier bearing to fit in on one side end surface facing the inner cavity of the intermediate housing. The planetary carrier bearing is embedded in the receiving groove, and the outer ring is installed in cooperation with the intermediate connecting plate. The floating sun gear, the planetary carrier bearing, the intermediate connecting plate, a plurality of planetary pins, a plurality of planetary gear bearings, a plurality of planetary gears, an inner gear ring, a locking nut and a planetary carrier are arranged in the inner cavity of the intermediate housing. The intermediate housing is sleeved on the outer periphery of the inner gear ring. The inner gear ring is fixed by a locking nut. The floating sun gear is sleeved on the output shaft of the speed-increasing gear transmission unit. The plurality of planetary pins are supported between the inner gear ring and the floating sun gear through the planetary carrier. The plurality of planetary pins are arranged around the floating sun gear. The plurality of planetary gears are sleeved on the planetary pins through the planetary gear bearings. The planetary pins, planetary wheel bearings and planetary wheels constitute the axis system of the planetary wheels. The plurality of planetary wheels are all meshed with the floating sun wheel externally and meshed with the inner gear ring internally.

[0008] The output bearing seat, the output outer shaft and the output inner shaft are coaxially arranged. The output bearing seat is a cylindrical structure with open ends and a hollow interior. The output bearing seat is arranged at the rear end of the intermediate housing and is fixedly connected to the intermediate housing by screws. The open ends of the output bearing seat are blocked by the front end cover of the output outer shaft and the rear end cover of the output outer shaft. The front end cover of the output outer shaft and the rear end cover of the output outer shaft are both provided with holes for the output outer shaft to pass through. The output bearing seat is arranged at the rear end opening of the intermediate housing. The output outer shaft oil seal is fixed on the rear end cover of the output outer shaft. The output outer shaft is a cylindrical structure with open ends and a hollow interior. An annular flange I and an annular flange II are arranged on the inner wall of the output outer shaft. The annular flange II divides the inner cavity of the output outer shaft into chamber I and chamber II. The annular flange I is located in chamber I. The output outer shaft is accommodated in the output bearing seat. The front end of the output outer shaft passes through the front end cover of the output outer shaft and extends into the inner cavity of the intermediate housing, and the rear end extends out of the output bearing seat. The front end of the output outer shaft is connected to the inner gear ring through a spline structure. The outer wall of the output outer shaft is in contact with the output outer shaft oil seal. The annular cavity between the output bearing seat and the output outer shaft is provided with an output outer shaft front bearing and an output outer shaft rear bearing. The output inner shaft is accommodated in the inner cavity of the output outer shaft. The outer wall of the output inner shaft is in contact with the annular flange II. The front end of the output inner shaft extends into the inner cavity of the intermediate housing, and the rear end extends out of the output outer shaft. The front end of the output inner shaft is connected to the planet carrier through a spline structure. The annular cavity between the output inner shaft and the output outer shaft is provided with an output inner shaft oil seal, an output inner shaft rear bearing, an output shaft inner distance ring and an output inner shaft front bearing. The output inner shaft oil seal, the output inner shaft rear bearing, the output shaft inner distance ring and the output inner shaft front bearing are all arranged in chamber I. The output shaft inner distance ring is clamped between the output inner shaft rear bearing and the output inner shaft front bearing. The output inner shaft oil seal is clamped between the output inner shaft rear bearing and the output inner shaft front bearing.

[0009] The hub unit with variable pitch control comprises a rear hub unit, a front hub unit, a rear propeller variable pitch control and a front propeller variable pitch control.

[0010] The rear propeller hub unit is sleeved on the periphery of the output inner shaft and is fixedly connected to the output outer shaft.

[0011] The rear propeller pitch control comprises a plurality of rear propeller control linear mechanisms, a rear propeller pitch bearing, a rear propeller control outer ring, a rear propeller control inner ring, a plurality of rear propeller control connecting rods and a plurality of test rear propeller shafts. The plurality of test rear propeller shafts are sleeved on the periphery of the rear propeller hub unit. The rear propeller control inner ring is sleeved on the periphery of the output outer shaft. The rear propeller control inner ring and the output outer shaft are connected by a spline with clearance fit. The rear propeller pitch bearing and the rear propeller control outer ring are sleeved on the periphery of the rear propeller control inner ring in sequence. The rear propeller control linear mechanism is connected to the rear propeller control outer ring by a hinge structure. The plurality of rear propeller control connecting rods are connected between the rear propeller control inner ring and a plurality of test rear propeller shafts. The rear propeller control outer ring does not rotate, and the rear propeller control inner ring and the output outer shaft rotate synchronously. The rear propeller control inner ring moves linearly along the spline of the output outer shaft. A rear propeller speed sensor is arranged on the rear propeller control outer ring.

[0012] The front propeller pitch control comprises a front propeller control linear mechanism, a front propeller pitch change joint, a front propeller pitch change rod, a plurality of front propeller pitch change rotating blocks, a front propeller pitch change block, a front propeller pitch change rod bearing, a plurality of pins and a front propeller speed sensor. The front propeller pitch change rod is inserted into the output inner shaft. The front end of the output inner shaft extends out of the output shaft of the speed increasing gear transmission unit, and the rear end extends into the front propeller hub unit. The front propeller control linear mechanism is arranged outside the front end of the speed increasing gear transmission unit. A front propeller pitch change joint is connected between the speed increasing gear transmission unit and the front propeller pitch change rod. The plurality of front propeller pitch change rotating blocks, the front propeller pitch change block, the front propeller pitch change rod bearing and a plurality of pins are all arranged in the front propeller hub unit. The front propeller pitch change block is sleeved on the front propeller pitch change rod through the front propeller pitch change rod bearing. A front propeller speed sensor is also arranged on the front propeller pitch change rod. A pin is arranged on the front propeller pitch change block. The front propeller pitch change rotating block is fixedly connected to the front propeller hub unit by screws. A sliding groove is arranged on the front propeller pitch change rotating block. The sliding groove of the front propeller pitch-changing rotating block cooperates with the pin shaft on the front propeller pitch-changing block to limit the maximum rotation position of the front propeller pitch-changing.

[0013] When working, when the pitch of the front and rear propellers remains unchanged, the input speed of the power input device is changed to change the speed of the front and rear propellers. When the working state of the power input device remains unchanged, the pitch of the front and rear propellers is adjusted to achieve the change of the speed of the front and rear propellers.

[0014] Furthermore, the connection between the front propeller control linear mechanism and the plurality of rear propeller control linear mechanisms are hinge structures.

[0015] Furthermore, there is also an anti-twist structure of the rear propeller pitch changing mechanism. The anti-twist structure of the rear propeller pitch changing mechanism includes an anti-twist bar I, an anti-twist bar II and an anti-twist base. The anti-twist base is fixed on the output bearing seat. The connection between the anti-twist bar I and the rear propeller operating outer ring is a hinge structure. The connection between the anti-twist bar I and the anti-twist bar II is a hinge structure. The connection between the anti-twist bar II and the anti-twist base is a hinge structure.

[0016] Further, the rear propeller to be measured is evenly arranged on the circumference of the rear hub unit. The front propeller to be measured is evenly arranged on the circumference of the front hub unit.

[0017] Furthermore, the tested front propeller and the tested rear propeller use hard blades.

[0018] Furthermore, during the performance test using the power transmission device, the torque speed sensor measures the input speed and torque of the compound planetary gearbox, and the input power of the compound planetary gearbox is calculated. The constant value of the torque ratio of the output outer shaft and the output inner shaft is obtained according to the gear parameters of the differential planetary unit, and the torque of the output inner shaft and the output outer shaft is obtained by the ratio of the input parameters of the compound planetary gearbox and the torque of the output outer shaft and the output inner shaft. The rear propeller speed sensor measures the rear propeller speed, and the front propeller speed sensor measures the front propeller speed. The front and rear propeller power is obtained by using the front and rear propeller torque and the front and rear propeller speed. The front propeller pitch is calculated by the extension or retraction stroke of the front propeller control linear mechanism, and the rear propeller pitch is calculated by the extension or retraction stroke of the rear propeller control linear mechanism.

[0019] The technical effects of the present invention are unquestionable:

[0020] A. Test the coaxial counter-rotating propeller test transmission device with one input shaft for input and two output shafts for output, which are coaxial and in opposite directions;

[0021] B. The compound planetary gearbox adopts a differential reduction transmission mechanism that first increases the speed and then adopts a differential NGW planetary gear train;

[0022] C. Use several linear mechanisms to test the rotation and pitch change of the front and rear propellers around their own axes, so that the operation of the front and rear propeller pitch change is more flexible, the structure is simpler, and the front and rear propeller pitches can be adjusted separately;

[0023] D. Install propellers on the front and rear hubs, and adjust the pitch of the propeller on one of the hubs to ensure that the output state of the power input device remains unchanged while achieving the speed change of the two output shafts; or adjust the pitch of the propellers on the two hubs to ensure that the output state of the power input device remains unchanged while achieving the speed change of the two output shafts.

[0024] E. Achieve stepless speed change of the front and rear propeller hub shafts by controlling the output speed of the power input device or adjusting the front and rear propeller pitches. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is the mechanical transmission principle diagram of the present invention;

[0026] Figure 2 It is a structural layout diagram of the present invention;

[0027] Figure 3 It is a schematic cross-sectional view of the structure of the compound planetary gearbox of the present invention;

[0028] Figure 4 It is a cross-sectional structural schematic diagram of the compound planetary gearbox and propeller hub (with variable pitch control) unit of the present invention;

[0029] Figure 5 It is a schematic cross-sectional structure diagram of the front hub and rear hub unit of the present invention;

[0030] Figure 6 It is a schematic cross-sectional structure diagram of the front propeller and rear propeller pitch changing mechanism of the present invention;

[0031] Figure 7 It is a schematic diagram of the anti-twist mechanism of the rear propeller pitch machine of the present invention;

[0032] Figure 8 It is a schematic diagram of the front propeller pitch changing mechanism of the present invention.

[0033] In the figure: power input device 01, coupling 02, torque speed sensor 03, coupling 04, compound planetary gearbox 05, hub unit with variable pitch control 06, rear propeller pitch mechanism 07, front propeller pitch mechanism 08, tested front propeller 09, tested rear propeller 10, differential planetary unit 051, speed increasing gear transmission unit 0501, floating sun gear 0502, planet carrier bearing 0503, intermediate connecting plate 0504, planetary pin 0505, planetary gear bearing 0506, planetary gear 0507, inner gear ring 0508, intermediate housing 0509, output outer shaft front end cover 0510, output outer shaft front bearing 0511, output bearing seat 0512, output outer shaft rear bearing 0513, output outer shaft rear end cover 0514, output outer shaft oil seal 0515, output inner shaft oil seal 0516, output outer shaft 05 17. Output inner shaft 0518, output inner shaft rear bearing 0519, output shaft inner distance ring 0520, output inner shaft front bearing 0521, locking nut 0522, planet carrier 0523, rear propeller hub unit 0601, front propeller hub unit 0602, rear propeller control linear mechanism 0701, rear propeller variable pitch bearing 0702, rear propeller control outer ring 0703, rear propeller control inner ring 0704, rear propeller control connecting rod 0705 05. Test the rear propeller shaft 0706, anti-torsion bar I 0707, anti-torsion bar II 0708, anti-torsion base 0709, rear propeller speed sensor 0710, front propeller linear control mechanism 0801, front propeller pitch change joint 0802, front propeller pitch change rod 0803, front propeller pitch change rotating block 0804, front propeller pitch change block 0805, front propeller pitch change rod bearing 0806, pin shaft 0807, and front propeller speed sensor 0808. DETAILED DESCRIPTION

[0034] The present invention is further described below in conjunction with the embodiments, but it should not be understood that the above subject matter of the present invention is limited to the following embodiments. Without departing from the above technical ideas of the present invention, various substitutions and changes are made according to the common technical knowledge and customary means in the art, which should all be included in the protection scope of the present invention.

[0035] Embodiment 1:

[0036] This embodiment provides a power transmission device for coaxial counter-rotating propeller performance testing, including a power input device 01, an input shaft, a compound planetary gearbox 05 and a hub unit with variable pitch control 06 connected in sequence.

[0037] The motor shaft of the power input device 01 is connected to the input shaft through a coupling I 02. A torque speed sensor 03 is arranged on the shaft of the input shaft. The input shaft is connected to the compound planetary gearbox 05 through a coupling II 04.

[0038] The compound planetary gearbox 05 includes a speed increasing gear transmission unit 0501 and a differential planetary unit 051. The differential planetary unit 051 includes a floating sun gear 0502, a planet carrier bearing 0503, a plurality of planetary pins 0505, a plurality of planetary gear bearings 0506, a plurality of planetary gears 0507, an inner gear ring 0508, an intermediate housing 0509, an output bearing seat 0512, an output outer shaft 0517, an output inner shaft 0518, a locking nut 0522 and a planet carrier 0523.

[0039] The intermediate housing 0509 is a cylindrical structure with open ends and a hollow interior. The front end of the intermediate housing 0509 is blocked by an intermediate connecting plate 0504. A through hole is provided in the center of the intermediate connecting plate 0504. The output shaft of the speed-increasing gear transmission unit 0501 passes through the through hole of the intermediate connecting plate 0504 and then extends into the intermediate housing 0509. The intermediate connecting plate 0504 has a receiving groove for the planetary carrier bearing 0503 to fit on the end surface on one side facing the inner cavity of the intermediate housing 0509. The planetary carrier bearing 0503 is embedded in the receiving groove, and the outer ring is installed in cooperation with the intermediate connecting plate 0504. The floating sun gear 0502, the planetary carrier bearing 0503, the intermediate connecting plate 0504, a plurality of planetary pins 0505, a plurality of planetary wheel bearings 0506, a plurality of planetary wheels 0507, an inner gear ring 0508, a locking nut 0522 and a planetary carrier 0523 are arranged in the inner cavity of the intermediate housing 0509. The intermediate housing 0509 is sleeved on the outer periphery of the inner gear ring 0508. The inner gear ring 0508 is fixed by being compressed by a locking nut 0522. The floating sun gear 0502 is sleeved on the output shaft of the speed increasing gear transmission unit 0501. The plurality of planetary pins 0505 are supported between the inner gear ring 0508 and the floating sun gear 0502 through a planet carrier 0523. The plurality of planetary pins 0505 are arranged around the floating sun gear 0502. The plurality of planetary gears 0507 are sleeved on the planetary pins 0505 through planetary gear bearings 0506. The planetary pins 0505, the planetary gear bearings 0506 and the planetary gears 0507 constitute the axis system of the planetary gears. The plurality of planetary gears 0507 are all meshed with the floating sun gear 0502 externally and meshed with the inner gear ring 0508 internally.

[0040] The output bearing seat 0512, the output outer shaft 0517 and the output inner shaft 0518 are coaxially arranged. The output bearing seat 0512 is a cylindrical structure with open ends and a hollow interior. The output bearing seat 0512 is arranged at the rear end of the intermediate housing 0509 and is fixedly connected to the intermediate housing 0509 by screws. The open ends of the output bearing seat 0512 are blocked by the output outer shaft front end cover 0510 and the output outer shaft rear end cover 0514. The output outer shaft front end cover 0510 and the output outer shaft rear end cover 0514 are both provided with holes for the output outer shaft 0517 to pass through. The output bearing seat 0512 is arranged at the rear end open end of the intermediate housing 0509. The output outer shaft oil seal 0515 is fixed on the output outer shaft rear end cover 0514. The output outer shaft 0517 is a cylindrical structure with open ends and a hollow interior. The inner wall of the output outer shaft 0517 is provided with an annular flange I and an annular flange II. The annular flange II divides the inner cavity of the output outer shaft 0517 into chamber I and chamber II. The annular flange I is located in chamber I. The output outer shaft 0517 is accommodated in the output bearing seat 0512. The front end of the output outer shaft 0517 passes through the output outer shaft front end cover 0510 and extends into the inner cavity of the intermediate housing 0509, and the rear end extends out of the output bearing seat 0512. The front end of the output outer shaft 0517 is connected to the inner gear ring 0508 through a spline structure. The outer wall of the output outer shaft 0517 abuts against the output outer shaft oil seal 0515. The output outer shaft front bearing 0511 and the output outer shaft rear bearing 0513 are arranged in the annular cavity between the output bearing seat 0512 and the output outer shaft 0517. The output inner shaft 0518 is accommodated in the inner cavity of the output outer shaft 0517. The outer wall of the output inner shaft 0518 abuts against the annular flange II. The front end of the output inner shaft 0518 extends into the inner cavity of the intermediate housing 0509, and the rear end extends out of the output outer shaft 0517. The front end of the output inner shaft 0518 is connected to the planet carrier 0523 through a spline structure. The output inner shaft oil seal 0516, the output inner shaft rear bearing 0519, the output shaft inner distance ring 0520 and the output inner shaft front bearing 0521 are arranged in the annular cavity between the output inner shaft 0518 and the output outer shaft 0517. The output inner shaft oil seal 0516, the output inner shaft rear bearing 0519, the output shaft inner distance ring 0520 and the output inner shaft front bearing 0521 are all arranged in the chamber I. The output shaft inner distance ring 0520 is sandwiched between the output inner shaft rear bearing 0519 and the output inner shaft front bearing 0521. The output inner shaft oil seal 0516 is sandwiched between the output inner shaft rear bearing 0519 and the annular flange I.

[0041] The hub unit with variable pitch control 06 includes a rear hub unit 0601 , a front hub unit 0602 , a rear propeller variable pitch control 07 and a front propeller variable pitch control 08 .

[0042] The rear hub unit 0601 is sleeved on the periphery of the output inner shaft 0518 and is fixedly connected to the output outer shaft 0517.

[0043] The rear propeller pitch control 07 includes a plurality of rear propeller control linear mechanisms 0701, a rear propeller pitch bearing 0702, a rear propeller control outer ring 0703, a rear propeller control inner ring 0704, a plurality of rear propeller control connecting rods 0705 and a plurality of test rear propeller shafts 0706. The plurality of test rear propeller shafts 0706 are sleeved on the periphery of the rear propeller hub unit 0601. The rear propeller control inner ring 0704 is sleeved on the periphery of the output outer shaft 0517. The rear propeller control inner ring 0704 and the output outer shaft 0517 are connected by a spline with clearance fit. The rear propeller pitch bearing 0702 and the rear propeller control outer ring 0703 are sleeved on the periphery of the rear propeller control inner ring 0704 in sequence. The rear propeller control linear mechanism 0701 and the rear propeller control outer ring 0703 are connected by a hinge structure. The plurality of rear propeller control connecting rods 0705 are bridged between the rear propeller control inner ring 0704 and the plurality of test rear propeller shafts 0706. The rear propeller control outer ring 0703 does not rotate, and the rear propeller control inner ring 0704 rotates synchronously with the output outer shaft 0517. The rear propeller control inner ring 0704 moves along the spline of the output outer shaft 0517. A rear propeller speed sensor 0710 is arranged on the rear propeller control outer ring 0703.

[0044] The front propeller pitch control 08 includes a front propeller linear control mechanism 0801, a front propeller pitch change joint 0802, a front propeller pitch change rod 0803, a plurality of front propeller pitch change rotating blocks 0804, a front propeller pitch change block 0805, a front propeller pitch change rod bearing 0806, a plurality of pins 0807 and a front propeller speed sensor 0808. The front propeller pitch change rod 0803 is inserted into the output inner shaft 0518. The front end of the output inner shaft 0518 extends out of the output shaft of the speed increasing gear transmission unit 0501, and the rear end extends into the front propeller hub unit 0602. The front propeller linear control mechanism 0801 is arranged outside the front end of the speed increasing gear transmission unit 0501. The front propeller pitch change joint 0802 is connected between the speed increasing gear transmission unit 0501 and the front propeller pitch change rod 0803. The plurality of front propeller pitch-changing rotating blocks 0804, the front propeller pitch-changing blocks 0805, the front propeller pitch-changing rod bearings 0806 and the plurality of pins 0807 are all arranged in the front propeller hub unit 0602. The front propeller pitch-changing block 0805 is sleeved on the front propeller pitch-changing rod 0803 through the front propeller pitch-changing rod bearings 0806. The front propeller pitch-changing rod 0803 is also provided with a front propeller speed sensor 0808. The front propeller pitch-changing block 0805 is provided with a pin 0807. The front propeller pitch-changing rotating block 0804 is fixedly connected to the front propeller hub unit 0602 by screws. The front propeller pitch-changing rotating block 0804 is provided with a sliding groove. The sliding groove of the front propeller pitch-changing rotating block 0804 cooperates with the pin 0807 on the front propeller pitch-changing block 0805 to limit the maximum rotation position of the front propeller pitch-changing.

[0045] When working, when the front and rear propeller pitches remain unchanged, the input speed of the power input device 01 is changed to change the front and rear propeller speeds. When the working state of the power input device 01 remains unchanged, the front and rear propeller pitches are adjusted to achieve the front and rear propeller speed changes.

[0046] During the performance test using the power transmission device, the torque speed sensor 03 measures the input speed and torque of the compound planetary gearbox, and the input power of the compound planetary gearbox is calculated. The constant value of the torque ratio of the output outer shaft and the output inner shaft is obtained according to the gear parameters of the differential planetary unit, and the torque of the output inner shaft and the output outer shaft is obtained by the ratio of the input parameters of the compound planetary gearbox and the torque of the output outer shaft and the output inner shaft. The rear propeller speed sensor 0710 measures the rear propeller speed, and the front propeller speed sensor 0808 measures the front propeller speed. The front and rear propeller power is obtained by using the front and rear propeller torque and the front and rear propeller speed. The front propeller pitch is calculated by the extension or retraction stroke of the front propeller control linear mechanism 0801, and the rear propeller pitch is calculated by the extension or retraction stroke of the rear propeller control linear mechanism 0701.

[0047] This embodiment is a differential transmission mechanism designed based on the theory of planetary transmission mechanisms. The front and rear hubs of the coaxial counter-rotating propeller test transmission device are coaxial and rotate in opposite directions. The propellers on the front and rear hubs of the coaxial counter-rotating propeller test transmission device can be changed in pitch individually. When the pitches of the front and rear propellers remain unchanged, the coaxial counter-rotating propeller test transmission device can change the rotation speed of the front and rear propellers according to the input rotation speed of the power input device. When the working state of the power input device remains unchanged, the coaxial counter-rotating propeller test transmission device adjusts the pitches of the front and rear propellers to achieve the change in the rotation speed of the front and rear propellers. The coaxial counter-rotating propeller test transmission device is a stepless speed transmission device. This embodiment realizes the test of the front and rear propellers rotating around their own axis to change the pitch, so that the operation of the front and rear propeller pitch change is more flexible, the structure is simpler, and the front and rear propeller pitches are individually adjustable.

[0048] The transmission path of the transmission device for testing the coaxial counter-rotating propeller test in this embodiment is as follows: the power is transmitted to the compound planetary gearbox 05 through the power input device 01, the coupling 02, the torque speed sensor 03, and the coupling 04, and the power is increased by the speed-increasing gear transmission unit 0501 of the compound planetary gearbox 05, and then differentially diverted to the output outer shaft 0517 and the output inner shaft 0518 through the differential planetary unit 051, wherein the planet carrier 0523 is connected to the output inner shaft 0518, and the output inner shaft 0518 is connected to the front hub unit 0602. The inner gear ring 0508 is connected to the output outer shaft 0517, and the output outer shaft 0517 is connected to the rear hub unit 0601. By adjusting the pitch of the propeller on one of the hub units, the speed change of the two output shafts is achieved while ensuring that the output state of the power input device remains unchanged. Or by adjusting the pitch of the propellers on the two hub units, the speed change of the two output shafts is achieved while ensuring that the output state of the power input device remains unchanged. The speed of the front and rear propeller hub shafts can also be changed by controlling the output speed of the power input device without changing the pitch of the front and rear propellers.

[0049] Embodiment 2:

[0050] The main contents of this embodiment are the same as those of Embodiment 1, wherein the connection between the front paddle control linear mechanism 0801 and the plurality of rear paddle control linear mechanisms 0701 are hinge structures.

[0051] Embodiment 3:

[0052] The main contents of this embodiment are the same as those of Embodiment 1 or 2, wherein the rear propeller pitch changing mechanism anti-torsion structure is also provided. The rear propeller pitch changing mechanism anti-torsion structure comprises an anti-torsion bar I0707, an anti-torsion bar II0708 and an anti-torsion base 0709. The anti-torsion base 0709 is fixed on the output bearing seat 0512. The connection between the anti-torsion bar I0707 and the rear propeller operating outer ring 0703 is a hinge structure. The connection between the anti-torsion bar I0707 and the anti-torsion bar II0708 is a hinge structure. The connection between the anti-torsion bar II0708 and the anti-torsion base 0709 is a hinge structure.

[0053] Embodiment 4:

[0054] The main content of this embodiment is the same as any one of embodiments 1 to 3, wherein the rear propeller 10 to be tested is evenly arranged on the circumference of the rear hub unit 0601. The front propeller 09 to be tested is evenly arranged on the circumference of the front hub unit 0602. The front propeller 09 to be tested and the rear propeller 10 to be tested use hard blades.

Claims

1. A power transmission device for testing the performance of coaxial counter-rotating propellers, characterized in that: It comprises a power input device (01), an input shaft, a compound planetary gearbox (05) and a hub unit with variable pitch control (06) which are connected in sequence; The motor shaft of the power input device (01) is connected to the input shaft via a coupling I (02); a torque speed sensor (03) is arranged on the shaft body of the input shaft; the input shaft is connected to the compound planetary gearbox (05) via a coupling II (04); The compound planetary gearbox (05) comprises a speed-increasing gear transmission unit (0501) and a differential planetary unit (051); the differential planetary unit (051) comprises a floating sun gear (0502), a planet carrier bearing (0503), a plurality of planetary pins (0505), a plurality of planetary gear bearings (0506), a plurality of planetary gears (0507), an inner gear ring (0508), an intermediate housing (0509), an output bearing seat (0512), an output outer shaft (0517), an output inner shaft (0518), a locking nut (0522) and a planet carrier (0523); The intermediate shell (0509) is a cylindrical structure with two open ends and a hollow interior; the front end opening of the intermediate shell (0509) is sealed by an intermediate connecting disk (0504); a through hole is provided at the center of the intermediate connecting disk (0504); the output shaft of the speed increasing gear transmission unit (0501) passes through the through hole of the intermediate connecting disk (0504) and then extends into the intermediate shell (0509); the intermediate connecting disk (0504) faces the inner cavity of the intermediate shell (0509) One side end surface of the planet carrier bearing (0503) is provided with a receiving groove for the planet carrier bearing (0503) to be embedded; the planet carrier bearing (0503) is embedded in the receiving groove, and the outer ring is installed in cooperation with the intermediate connecting plate (0504); the floating sun gear (0502), the planet carrier bearing (0503), the intermediate connecting plate (0504), a plurality of planetary pins (0505), a plurality of planetary gear bearings (0506), a plurality of planetary gears (0507), an inner gear ring (0508), a locking nut (0522) and a row The planet carrier (0523) is arranged in the inner cavity of the intermediate housing (0509); the intermediate housing (0509) is sleeved on the outer periphery of the inner gear ring (0508); the inner gear ring (0508) is fixed in the form of being compressed by a locking nut (0522); the floating sun gear (0502) is sleeved on the output shaft of the speed increasing gear transmission unit (0501); the plurality of planetary pins (0505) are supported on the inner gear ring (0508) and the floating sun gear (0508) through the planet carrier (0523). 502); the plurality of planetary pins (0505) are arranged around the floating sun gear (0502); the plurality of planetary gears (0507) are sleeved on the planetary pins (0505) through the planetary gear bearings (0506); the planetary pins (0505), the planetary gear bearings (0506) and the planetary gears (0507) constitute the axis system of the planetary gears; the plurality of planetary gears (0507) are all meshed with the floating sun gear (0502) externally and meshed with the inner gear ring (0508) internally; The output bearing seat (0512), the output outer shaft (0517) and the output inner shaft (0518) are coaxially arranged; the output bearing seat (0512) is a cylindrical structure with two open ends and a hollow interior; the output bearing seat (0512) is arranged at the rear end of the intermediate housing (0509) and is fixedly connected to the intermediate housing (0509) by screws; the open ends of the output bearing seat (0512) are blocked by the output outer shaft front end cover (0510) and the output outer shaft rear end cover (0514); the output outer shaft front end cover (0510) and the output outer shaft rear end cover (0514) are both provided with holes for the output outer shaft (0517) to pass through; the output bearing seat (0512) is arranged at the intermediate housing (0509) ) at the rear end opening; the output outer shaft oil seal (0515) is fixed on the rear end cover (0514) of the output outer shaft; the output outer shaft (0517) is a cylindrical structure with two ends open and hollow inside; an annular flange I and an annular flange II are provided on the inner wall of the output outer shaft (0517); the annular flange II divides the inner cavity of the output outer shaft (0517) into chamber I and chamber II; the annular flange I is located in chamber I; the output outer shaft (0517) is accommodated in the output bearing seat (0512); the front end of the output outer shaft (0517) passes through the front end cover (0510) of the output outer shaft and then extends into the inner cavity of the intermediate housing (0509), and the rear end extends out of the output bearing seat (0512); the output outer shaft (05 17) is connected to the inner gear ring (0508) through a spline structure; the outer wall of the output outer shaft (0517) is in contact with the output outer shaft oil seal (0515); the annular cavity between the output bearing seat (0512) and the output outer shaft (0517) is provided with an output outer shaft front bearing (0511) and an output outer shaft rear bearing (0513); the output inner shaft (0518) is accommodated in the inner cavity of the output outer shaft (0517); the outer wall of the output inner shaft (0518) is in contact with the annular flange II; the front end of the output inner shaft (0518) extends into the inner cavity of the intermediate housing (0509), and the rear end extends out of the output outer shaft (0517); the front end of the output inner shaft (0518) is connected to the planet carrier (0517) through a spline structure 523) connected; an output inner shaft oil seal (0516), an output inner shaft rear bearing (0519), an output shaft inner distance ring (0520) and an output inner shaft front bearing (0521) are arranged in the annular cavity between the output inner shaft (0518) and the output outer shaft (0517); the output inner shaft oil seal (0516), the output inner shaft rear bearing (0519), the output shaft inner distance ring (0520) and the output inner shaft front bearing (0521) are all arranged in chamber I; the output shaft inner distance ring (0520) is sandwiched between the output inner shaft rear bearing (0519) and the output inner shaft front bearing (0521); the output inner shaft oil seal (0516) is sandwiched between the output inner shaft rear bearing (0519) and the annular flange I; The hub unit with variable pitch control (06) comprises a rear hub unit (0601), a front hub unit (0602), a rear propeller variable pitch control (07) and a front propeller variable pitch control (08); The rear propeller hub unit (0601) is sleeved on the periphery of the output inner shaft (0518) and is fixedly connected to the output outer shaft (0517); The rear propeller pitch control (07) comprises a plurality of rear propeller control linear mechanisms (0701), a rear propeller pitch control bearing (0702), a rear propeller control outer ring (0703), a rear propeller control inner ring (0704), a plurality of rear propeller control connecting rods (0705) and a plurality of test rear propeller shafts (0706); the plurality of test rear propeller shafts (0706) are sleeved on the periphery of the rear propeller hub unit (0601); the rear propeller control inner ring (0704) is sleeved on the periphery of the output outer shaft (0517); the rear propeller control inner ring (0704) and the output outer shaft (0517) are connected by a spline with clearance fit; the rear propeller pitch control bearing (0702) and the rear propeller control outer ring (0703 ... and the output outer shaft (0517) are sleeved on the periphery of the rear propeller hub unit (0601); the rear propeller control inner ring (0704) and the output outer shaft (0517) are sleeved on the periphery of the rear propeller hub unit (0601); the rear propeller control inner ring (0704) and the output outer shaft (0517) are sleeved on the periphery of the rear propeller hub unit (0601); the rear propeller control inner ring (0704) and the 0703) are sequentially sleeved on the outer periphery of the rear propeller control inner ring (0704); the rear propeller control linear mechanism (0701) and the rear propeller control outer ring (0703) are connected by a hinge structure; the plurality of rear propeller control connecting rods (0705) are bridged between the rear propeller control inner ring (0704) and the plurality of test rear propeller shafts (0706); the rear propeller control outer ring (0703) does not rotate, and the rear propeller control inner ring (0704) and the output outer shaft (0517) rotate synchronously; the rear propeller control inner ring (0704) moves linearly along the spline of the output outer shaft (0517); a rear propeller speed sensor (0710) is arranged on the rear propeller control outer ring (0703); The front propeller pitch control (08) comprises a front propeller control linear mechanism (0801), a front propeller pitch change joint (0802), a front propeller pitch change rod (0803), a plurality of front propeller pitch change rotating blocks (0804), a front propeller pitch change block (0805), a front propeller pitch change rod bearing (0806), a plurality of pins (0807) and a front propeller speed sensor (0808); the front propeller pitch change rod (0803) is inserted into the output inner shaft (0518); the front end of the output inner shaft (0518) extends out of the output shaft of the speed increasing gear transmission unit (0501), and the rear end extends into the front propeller hub unit (0602); the front propeller control linear mechanism (0801) is arranged on the outer side of the front end of the speed increasing gear transmission unit (0501); the front propeller pitch change joint (0802) is connected between the speed increasing gear transmission unit (0501) and the front propeller pitch change rod (0803); A plurality of front propeller pitch-changing rotating blocks (0804), a front propeller pitch-changing block (0805), a front propeller pitch-changing rod bearing (0806) and a plurality of pins (0807) are arranged in the front propeller hub unit (0602); the front propeller pitch-changing block (0805) is sleeved on the front propeller pitch-changing rod (0803) through the front propeller pitch-changing rod bearing (0806); a front propeller speed sensor (0808) is also arranged on the front propeller pitch-changing rod (0803) ; A pin shaft (0807) is arranged on the front propeller pitch changing block (0805); the front propeller pitch changing rotating block (0804) is fixedly connected to the front propeller hub unit (0602) by means of screws; a sliding groove is arranged on the front propeller pitch changing rotating block (0804); the sliding groove of the front propeller pitch changing rotating block (0804) cooperates with the pin shaft (0807) on the front propeller pitch changing block (0805) to limit the maximum rotation position of the front propeller pitch changing; When working, when the pitch of the front and rear propellers remains unchanged, the input speed of the power input device (01) is changed to change the speed of the front and rear propellers; when the working state of the power input device (01) remains unchanged, the pitch of the front and rear propellers is adjusted to achieve the change of the speed of the front and rear propellers.

2. A power transmission device for coaxial counter-rotating propeller performance testing according to claim 1, characterized in that: The connection points between the front paddle control linear mechanism (0801) and the plurality of rear paddle control linear mechanisms (0701) are all hinge structures.

3. A power transmission device for coaxial counter-rotating propeller performance testing according to claim 1, characterized in that: The invention also has an anti-twist structure of a rear propeller pitch changing mechanism; the anti-twist structure of the rear propeller pitch changing mechanism comprises an anti-twist bar I (0707), an anti-twist bar II (0708) and an anti-twist base (0709); the anti-twist base (0709) is fixed on an output bearing seat (0512); the connection between the anti-twist bar I (0707) and the rear propeller operating outer ring (0703) is a hinge structure; the connection between the anti-twist bar I (0707) and the anti-twist bar II (0708) is a hinge structure; the connection between the anti-twist bar II (0708) and the anti-twist base (0709) is a hinge structure.

4. A power transmission device for coaxial counter-rotating propeller performance testing according to claim 1, characterized in that: The rear propeller (10) to be measured is evenly arranged on the circumference of the rear hub unit (0601); and the front propeller (09) to be measured is evenly arranged on the circumference of the front hub unit (0602).

5. A power transmission device for coaxial counter-rotating propeller performance testing according to claim 4, characterized in that: The tested front propeller (09) and the tested rear propeller (10) use hard blades.

6. A power transmission device for coaxial counter-rotating propeller performance testing according to claims 1 to 5, characterized in that: During the performance test using the power transmission device, the torque speed sensor (03) measures the input speed and torque of the compound planetary gearbox, and the input power of the compound planetary gearbox is obtained through calculation. The constant value of the torque ratio of the output outer shaft and the output inner shaft is obtained according to the gear parameters of the differential planetary unit, and the torque of the output inner shaft and the output outer shaft is obtained through the input parameters of the compound planetary gearbox and the ratio of the torque of the output outer shaft and the output inner shaft; the rear propeller speed sensor (0710) measures the rear propeller speed, and the front propeller speed sensor (0808) measures the front propeller speed, and the front and rear propeller power is obtained by using the front and rear propeller torque and the front and rear propeller speeds; the front propeller pitch is calculated by the extension or retraction stroke of the front propeller control linear mechanism (0801), and the rear propeller pitch is calculated by the extension or retraction stroke of the rear propeller control linear mechanism (0701).

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