A driving and transmission device for counter-rotating propeller testing in a wind tunnel

Abstract

A driving and transmission device required for a counter-rotating propeller test in a wind tunnel belongs to the technical field of fault prediction of aircraft propeller wind tunnels. The invention solves the problem of compact structural space required for a counter-rotating propeller test in a wind tunnel in the prior art. Technical points: The rear propeller drive motor is installed on the left and right sides of the variable speed gearbox, the airfoil strut assembly is installed on the variable speed gearbox, the angle gearbox is installed on the airfoil strut assembly, the rear propeller output shaft assembly and the front propeller output shaft assembly are provided on the front and rear sides of the angle gearbox, and the front propeller drive motor is installed at the rear end of the front propeller output shaft assembly. The present invention transmits power to the front and rear propeller hubs through the variable speed gearbox and the transmission shaft, and realizes high-precision measurement of the test loads of the front and rear propellers through a balance. It has the advantages of high propulsion efficiency, low vibration and noise levels, strong controllability, low energy consumption, etc., compact structural space, large driving power, and has engineering practical value in the field of wind tunnel testing.

Description

Technical Field

[0001] The invention relates to the technical field of fault prediction of aircraft propeller wind tunnels, and in particular to a driving and transmission device required for a counter-rotating propeller test in a wind tunnel. Background Art

[0002] Propellers are a key component for providing power for helicopters and rotorcraft, and are mainly divided into two types: single propellers and counter-rotating propellers. The single propeller system has a simple structural design, low failure rate, and high reliability, and is widely used in various small and medium-sized aircraft and ship fields. Compared with single propellers, counter-rotating propellers have the advantages of high propulsion efficiency, low vibration and noise levels, and enhanced controllability. Counter-rotating propellers use two propellers rotating in opposite directions to reduce wake vortices, improve propulsion efficiency, and reduce noise and vibration levels. In theory, the propulsion efficiency can be increased by more than 10% and energy consumption can be significantly reduced. The counter-rotating propeller system can achieve more precise control by adjusting the speed and angle of the front and rear propellers, and is more suitable for application scenarios that require high maneuverability and high-precision control. ‌

[0003] However, the design and manufacture of contra-rotating propellers are much more complicated than single propellers, and require consideration of higher precision and more complex mechanical structures. For wind tunnel tests of contra-rotating propellers, the propeller size is much smaller than that of helicopter rotors. However, due to the limitations of the size of the wind tunnel test section and the requirements of wind tunnel tests such as blockage, anti-interference, good vibration and noise reduction performance, and high-precision test data, the structural space of the drive device and transmission system of the contra-rotating propeller test device is limited, and it is difficult to collect high-precision test data. In addition, the high-power demand of the propeller test and the above wind tunnel test requirements will cause certain design contradictions.

[0004] Therefore, it is urgent to propose a driving and transmission device required for the counter-rotating propeller test in the wind tunnel, so as to solve the problem of compact structure space required for the counter-rotating propeller test in the wind tunnel in the prior art. Summary of the invention

[0005] In view of the above facts, in order to solve the problem of compact structure space required for counter-rotating propeller testing in wind tunnels in the prior art, the present invention further designs a driving and transmission device required for counter-rotating propeller testing in wind tunnels.

[0006] To achieve the above object, the present invention adopts the following technical solution:

[0007] A driving and transmission device for a counter-rotating propeller test in a wind tunnel, comprising a rear propeller driving motor, a front propeller driving motor, a speed change gear box, an airfoil strut assembly, an angle gear box, a front propeller output shaft assembly, a rear propeller output shaft assembly, a front propeller blade, a rear propeller blade, a front propeller hub, and a rear propeller hub;

[0008] The rear propeller drive motor is installed on the left and right sides of the speed change gear box, and the output shaft of the rear propeller drive motor is drivingly connected with the horizontal input gear of the speed change gear box;

[0009] The wing-shaped strut assembly is installed on the speed change gear box, and the vertical output gear of the speed change gear box is drivingly connected to the transmission shaft of the wing-shaped strut assembly, and the horizontal input gear is meshed with the vertical output gear;

[0010] The angle gearbox is mounted on the airfoil strut assembly, and the transmission shaft of the airfoil strut assembly is drivingly connected to the angle input gear of the angle gearbox;

[0011] The rear propeller output shaft assembly and the front propeller output shaft assembly are arranged on the front and rear sides of the angle gearbox, the angle output gear of the angle gearbox is meshed with the angle input gear, and is transmission-connected with the angle output shaft of the angle gearbox, and the angle output shaft is connected with the rear propeller rotor shaft of the rear propeller output shaft assembly through a rear propeller torque balance;

[0012] The rear propeller hub is installed at the front end of the rear propeller rotor shaft, the front propeller drive motor is installed at the rear end of the front propeller output shaft assembly, the output shaft of the front propeller drive motor is transmission-connected to the front propeller rotor shaft of the front propeller output shaft assembly, and the front propeller rotor shaft is placed inside the rear propeller rotor shaft;

[0013] The front propeller hub is installed at the front end of the front propeller rotor shaft, the front propeller blades are installed inside the front propeller hub, and the rear propeller blades are installed inside the rear propeller hub. The front propeller blades are arranged radially at the same interval with the axis of the front propeller hub as the center, and the rear propeller blades are arranged radially at the same interval with the axis of the rear propeller hub as the center;

[0014] The front propeller motor connector is installed on the outside of the front propeller output shaft assembly and the angle gear box.

[0015] Further: the speed change gearbox also includes a horizontal input coupling, a horizontal bearing seat, a speed change gearbox body, a vertical bearing seat, and a vertical output coupling;

[0016] The output shaft of the rear propeller driving motor is connected to the horizontal input gear through a horizontal input coupling; the horizontal bearing seat is fixedly installed in the speed change gear box, and the horizontal input gear is installed on the horizontal bearing seat through a bearing;

[0017] The vertical output gear is connected to the transmission shaft of the wing-shaped strut assembly through a vertical output coupling, the vertical bearing seat is fixedly installed in the speed change gear box, and the vertical output gear is installed on the vertical bearing seat through a bearing.

[0018] Further: the wing-shaped strut assembly also includes a height adjustment member, a lower support rod, a lower support rod bearing seat, an upper support rod, an upper support rod bearing seat, a strut middle section coupling, and a transmission shaft;

[0019] The transmission shaft comprises a lower transmission shaft and an upper transmission shaft, and the lower transmission shaft and the upper transmission shaft are connected through a support rod middle section coupling;

[0020] The height adjustment member is mounted on the speed change gear housing, and a lower support rod is fixedly mounted on the inner side of the height adjustment member. The lower support rod is sleeved on the outer side of the lower transmission shaft through a bearing and a lower support rod bearing seat.

[0021] An upper section support rod is installed at the upper end of the lower section support rod, and the upper section support rod is sleeved on the outside of the upper section transmission shaft through a bearing and an upper section support rod bearing seat.

[0022] Further: the angle gear box also includes an angle gear box body and an angle gear box body shell;

[0023] The angle gear box is fixedly connected to the upper support rod, the angle input gear is fixedly connected to the upper transmission shaft, the angle output gear is installed in the angle gear box through a bearing and a bearing seat, and the inner ring of the angle output gear is fixedly connected to the angle output shaft.

[0024] Further: the rear propeller output shaft assembly also includes a rear propeller bearing seat, a rear propeller transition connector, and a rear propeller force measuring balance;

[0025] A rear propeller dynamometer is provided between the rear propeller bearing seat and the angle gear box housing. The rear propeller dynamometer is connected to the rear propeller bearing seat through a rear propeller transition connector, and the rear propeller rotor shaft is installed on the rear propeller bearing seat through a bearing.

[0026] Further: the front propeller output shaft assembly also includes a front propeller bearing seat, a front propeller force measuring balance, a front propeller torque balance, and a front propeller motor connector;

[0027] The front propeller bearing seat is fixedly connected to the front propeller motor connecting piece, the front propeller force measuring balance is installed in the front propeller motor connecting piece, the front propeller rotor shaft is installed on the front propeller bearing seat through a bearing, and the front propeller torque balance is installed at the tail end of the front propeller rotor shaft;

[0028] The front propeller drive motor is installed on the rear shell of the front propeller motor connector, and the output shaft of the front propeller drive motor is connected to the front propeller torque balance through the front propeller diaphragm coupling.

[0029] Furthermore: the rear propeller drive motor is composed of two 400kw permanent magnet synchronous motors, and the output shaft axes of the rear propeller drive motors coincide.

[0030] Furthermore: the front propeller drive motor is a 260kw permanent magnet synchronous motor.

[0031] The beneficial effects of the present invention are:

[0032] 1. The present invention has a compact structure and space, and can realize the independent speed control of the front and rear propellers and the independent high-precision test of the test load, and has engineering practical value for the development of the counter-rotating propeller test system required in the field of wind tunnel tests.

[0033] 2. The present invention can achieve more precise control by adjusting the rotation speed and angle of the front and rear propellers.

[0034] 3. The present invention meets the requirements of the counter-rotating propeller test in the wind tunnel, such as compact structure space, high-precision test data acquisition, high-power transmission system, low blockage of the test device, anti-interference and good vibration and noise reduction performance, and provides equipment support and technical guarantee for the propeller wind tunnel test. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] Figure 1 It is the overall structural diagram of the present invention;

[0036] Figure 2 It is a structural diagram of the speed change gear box in the present invention;

[0037] Figure 3 It is a structural diagram of the wing-shaped strut assembly in the present invention;

[0038] Figure 4 This is a diagram of the transmission connection structure of the top of the counter-rotating propellers in the present invention;

[0039] Figure 5 This is a diagram showing the top position relationship of the counter-rotating propellers in the present invention.

[0040] In the figure: 1-rear propeller drive motor, 2-horizontal input coupling, 3-horizontal bearing seat, 4-horizontal input gear, 5-speed gear box, 6-vertical output gear, 7-vertical bearing seat, 8-vertical output coupling, 9-height adjustment member, 10-lower support rod, 11-lower support rod bearing seat, 12-lower transmission shaft, 14-support rod middle section coupling, 15-upper support rod bearing seat, 16-upper support rod, 17-upper transmission shaft, 19-front propeller rotor shaft, 20-front propeller hub, 21-rear propeller rotor shaft, 22-rear propeller hub, 23-rear propeller bearing seat, 24 -rear propeller transition connector, 25-rear propeller dynamometer, 26-rear propeller torque balance, 27-front propeller bearing seat, 28-angle output shaft, 29-angle gearbox, 30-front propeller motor connector, 31-front propeller dynamometer, 32-front propeller torque balance, 33-front propeller diaphragm coupling, 34-front propeller drive motor, 35-angle input gear, 36-angle output gear, 37-front propeller blade, 38-rear propeller blade, 39-speed gearbox, 40-wing support rod assembly, 41-angle gearbox, 42-rear propeller output shaft assembly, 43-front propeller output shaft assembly. DETAILED DESCRIPTION

[0041] In order to enable those skilled in the art to better understand the solution of the present application, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the present application.

[0042] It should be noted that the terms "first", "second", etc. in the specification and claims of the present application and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequential order. It should be understood that the data used in this way can be interchanged where appropriate, so that the embodiments of the present application described here. In addition, the terms "including" and "having" and any of their variations are intended to cover non-exclusive inclusions, for example, a process, method, system, product or device comprising a series of steps or units is not necessarily limited to those steps or units clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0043] In the present application, the directions or positional relationships indicated by the terms "upper", "lower", "inner", "middle", "outer", "front", "back", etc. are based on the directions or positional relationships shown in the drawings. These terms are mainly used to better describe the present application and its embodiments, and are not used to limit the indicated devices, elements or components to have a specific direction, or to be constructed and operated in a specific direction.

[0044] In addition, some of the above terms may be used to express other meanings in addition to indicating orientation or positional relationship. For example, the term "on" may also be used to express a certain dependency or connection relationship in some cases. For those of ordinary skill in the art, the specific meanings of these terms in this application can be understood according to specific circumstances.

[0045] In addition, the terms "disposed", "connected", and "fixed" should be understood in a broad sense. For example, "connected" can be a fixed connection, a detachable connection, or an integral structure; it can be a mechanical connection, or an electrical connection; it can be a direct connection, or an indirect connection through an intermediate medium, or it can be an internal connection between two devices, elements, or components. For those of ordinary skill in the art, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0046] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present application can be combined with each other. The present application will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0047] Preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

[0048] Embodiment: A driving and transmission device for a counter-rotating propeller test in a wind tunnel according to the present embodiment includes a rear propeller driving motor 1, a front propeller driving motor 34, a speed change gear box 39, an airfoil strut assembly 40, an angle gear box 41, a front propeller output shaft assembly 43, a rear propeller output shaft assembly 42, a front propeller blade 37, a rear propeller blade 38, a front propeller hub 20, and a rear propeller hub 22;

[0049] The rear propeller drive motor 1 is installed on the left and right sides of the speed change gear box 39, and the output shaft of the rear propeller drive motor 1 is transmission-connected to the horizontal input gear 4 of the speed change gear box 39;

[0050] The wing-shaped strut assembly 40 is mounted on the speed change gear box 39, and the vertical output gear 6 of the speed change gear box 39 is transmission-connected with the transmission shaft of the wing-shaped strut assembly 40, and the horizontal input gear 4 is meshed with the vertical output gear 6;

[0051] The angle gearbox 41 is mounted on the airfoil strut assembly 40, and the transmission shaft of the airfoil strut assembly 40 is in transmission connection with the angle input gear 35 of the angle gearbox 41;

[0052] The rear propeller output shaft assembly 42 and the front propeller output shaft assembly 43 are provided at the front and rear sides of the angle gearbox 41. The angle output gear 36 of the angle gearbox 41 is meshed with the angle input gear 35 and is transmission-connected with the angle output shaft 28 of the angle gearbox 41. The angle output shaft 28 is connected to the rear propeller rotor shaft 21 of the rear propeller output shaft assembly 42 via the rear propeller torque balance 26.

[0053] The rear propeller hub 22 is installed at the front end of the rear propeller rotor shaft 21, the front propeller drive motor 34 is installed at the rear end of the front propeller output shaft assembly 43, the output shaft of the front propeller drive motor 34 is transmission-connected with the front propeller rotor shaft 19 of the front propeller output shaft assembly 43, and the front propeller rotor shaft 19 is placed inside the rear propeller rotor shaft 21, so as to realize synchronous reverse rotation;

[0054] The front propeller hub 20 is installed at the front end of the front propeller rotor shaft 19, the front propeller blades 37 are installed inside the front propeller hub 20, and the rear propeller blades 38 are installed inside the rear propeller hub 22. The front propeller blades 37 are arranged radially at the same interval with the axis of the front propeller hub 20 as the center, and the rear propeller blades 38 are arranged radially at the same interval with the axis of the rear propeller hub 22 as the center.

[0055] More specifically: the speed change gear box 39 further includes a horizontal input coupling 2, a horizontal bearing seat 3, a speed change gear box body 5, a vertical bearing seat 7, and a vertical output coupling 8;

[0056] The output shaft of the rear propeller driving motor 1 is connected to the horizontal input gear 4 through the horizontal input coupling 2; the horizontal bearing seat 3 is fixedly installed in the speed change gear housing 5, and the horizontal input gear 4 is installed on the horizontal bearing seat 3 through a bearing;

[0057] The vertical output gear 6 is connected to the transmission shaft of the wing-shaped strut assembly 40 via a vertical output coupling 8. The vertical bearing seat 7 is fixedly installed in the speed change gear housing 5. The vertical output gear 6 is installed on the vertical bearing seat 7 via a bearing.

[0058] More specifically: the wing-shaped strut assembly 40 also includes a height adjustment member 9, a lower support rod 10, a lower support rod bearing seat 11, an upper support rod 16, an upper support rod bearing seat 15, a strut middle section coupling 14, and a transmission shaft;

[0059] The transmission shaft comprises a lower transmission shaft 12 and an upper transmission shaft 17, and the lower transmission shaft 12 and the upper transmission shaft 17 are connected via a support rod middle section coupling 14;

[0060] The height adjustment member 9 is mounted on the speed change gear housing 5 and can adjust the height. A lower support rod 10 is fixedly mounted on the inner side of the height adjustment member 9. The lower support rod 10 is sleeved on the outside of the lower transmission shaft 12 through a bearing and a lower support rod bearing seat 11.

[0061] An upper support rod 16 is installed at the upper end of the lower support rod 10, and the upper support rod 16 is sleeved on the outside of the upper transmission shaft 17 through a bearing and an upper support rod bearing seat 15;

[0062] The lower transmission shaft 12 and the upper transmission shaft 17 are connected via a support rod middle section coupling 14 .

[0063] More specifically: the angle gearbox 41 also includes an angle gearbox body 29 and an angle output box housing;

[0064] The angle gear housing 29 is fixedly connected to the upper support rod 16, the angle input gear 35 is fixedly connected to the upper transmission shaft 17, the angle output gear 36 is installed in the angle gear housing 29 through a bearing and a bearing seat, and the inner ring of the angle output gear 36 is fixedly connected to the angle output shaft 28.

[0065] More specifically: the rear propeller output shaft assembly 42 further includes a rear propeller bearing seat 23, a rear propeller transition connector 24, and a rear propeller force measuring balance 25;

[0066] A rear propeller dynamometer 25 is provided between the rear propeller bearing seat 23 and the angle gear box housing. The rear propeller dynamometer 25 is connected to the rear propeller bearing seat 23 through a rear propeller transition connector 24. The rear propeller rotor shaft 21 is installed on the rear propeller bearing seat 23 through a bearing.

[0067] More specifically: the front propeller output shaft assembly 43 further includes a front propeller bearing seat 27, a front propeller force measuring balance 31, a front propeller torque balance 32, and a front propeller motor connector 30;

[0068] The front propeller bearing seat 27 is fixedly connected to the front propeller motor connector 30, the front propeller force measuring balance 31 is installed in the front propeller motor connector 30, the front propeller rotor shaft 19 is installed on the front propeller bearing seat 27 through a bearing, and the front propeller torque balance 32 is installed at the tail end of the front propeller rotor shaft 19;

[0069] The front paddle driving motor 34 is mounted on the rear housing of the front paddle motor connector 30 , and the output shaft of the front paddle driving motor 34 is connected to the front paddle torque balance 32 via the front paddle diaphragm coupling 33 .

[0070] More specifically: the rear propeller drive motor 1 is composed of two 400kw permanent magnet synchronous motors, and the output shaft axes of the rear propeller drive motors 1 coincide with each other.

[0071] More specifically: the front propeller drive motor 34 is a 260kw permanent magnet synchronous motor.

[0072] More specifically: the operation process of the driving and transmission device required for the counter-rotating propeller test in the wind tunnel is:

[0073] The rear propeller driving motor 1 is started, driving the horizontal input gear 4 to transmit, and then the vertical output gear 6, the lower transmission shaft 12, and the upper transmission shaft 17 are sequentially transmitted, the upper transmission shaft 17 drives the angle input gear 35 to transmit, the angle input gear 35 drives the angle output gear 36 to transmit, and then the angle output shaft 28 is transmitted, the angle output shaft 28 drives the rear propeller rotor shaft 21 to transmit, and then the rear propeller blades 38 rotate;

[0074] The front propeller drive motor 34 is started, driving the front propeller rotor shaft 19 to transmit, and then the front propeller blades 37 rotate.

[0075] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, the technical solutions described in the aforementioned embodiments can still be modified, or some or all of the technical features therein can be replaced by equivalents. As long as there is no structural conflict, the various features in the specific implementation methods disclosed in this application can be combined with each other in any way, and the essence of the corresponding technical solutions will not deviate from the scope of the technical solutions of the present invention.

[0076] In addition, it should be understood that although the present specification is described according to implementation modes, not every implementation mode contains only one independent technical solution. This description of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment may also be appropriately combined to form other implementation modes that can be understood by those skilled in the art.

Claims

1. A driving and transmission device for a counter-rotating propeller test in a wind tunnel, characterized in that: It comprises a rear propeller drive motor (1), a front propeller drive motor (34), a speed change gear box (39), an airfoil support rod assembly (40), an angle gear box (41), a front propeller output shaft assembly (43), a rear propeller output shaft assembly (42), a front propeller blade (37), a rear propeller blade (38), a front propeller hub (20), and a rear propeller hub (22); The rear propeller driving motor (1) is mounted on the left and right sides of the speed change gear box (39), and the output shaft of the rear propeller driving motor (1) is drivingly connected to the horizontal input gear (4) of the speed change gear box (39); The wing-shaped strut assembly (40) is mounted on a speed change gear box (39), and the vertical output gear (6) of the speed change gear box (39) is drivingly connected to the transmission shaft of the wing-shaped strut assembly (40), and the horizontal input gear (4) is meshed with the vertical output gear (6); The angle gearbox (41) is mounted on the wing-shaped strut assembly (40), and the transmission shaft of the wing-shaped strut assembly (40) is in transmission connection with the angle input gear (35) of the angle gearbox (41); A rear propeller output shaft assembly (42) and a front propeller output shaft assembly (43) are provided on the front and rear sides of the angle gearbox (41); the angle output gear (36) of the angle gearbox (41) is meshed with the angle input gear (35) and is transmission-connected to the angle output shaft (28) of the angle gearbox (41); the angle output shaft (28) is connected to the rear propeller rotor shaft (21) of the rear propeller output shaft assembly (42) via a rear propeller torque balance (26); The rear propeller hub (22) is mounted at the front end of the rear propeller rotor shaft (21), the front propeller drive motor (34) is mounted at the rear end of the front propeller output shaft assembly (43), the output shaft of the front propeller drive motor (34) is transmission-connected to the front propeller rotor shaft (19) of the front propeller output shaft assembly (43), and the front propeller rotor shaft (19) is disposed inside the rear propeller rotor shaft (21); The front propeller hub (20) is mounted on the front end of the front propeller rotor shaft (19), the front propeller blades (37) are mounted inside the front propeller hub (20), and the rear propeller blades (38) are mounted inside the rear propeller hub (22). The front propeller blades (37) are arranged radially at the same interval with the axis of the front propeller hub (20) as the center, and the rear propeller blades (38) are arranged radially at the same interval with the axis of the rear propeller hub (22) as the center.

2. A driving and transmission device for a counter-rotating propeller test in a wind tunnel according to claim 1, characterized in that: The speed change gear box (39) further comprises a horizontal input coupling (2), a horizontal bearing seat (3), a speed change gear box body (5), a vertical bearing seat (7), and a vertical output coupling (8); The output shaft of the rear propeller driving motor (1) is connected to the horizontal input gear (4) via a horizontal input coupling (2); the horizontal bearing seat (3) is fixedly mounted in the speed change gear housing (5), and the horizontal input gear (4) is mounted on the horizontal bearing seat (3) via a bearing; The vertical output gear (6) is connected to the transmission shaft of the wing-shaped strut assembly (40) via a vertical output coupling (8); the vertical bearing seat (7) is fixedly mounted in the speed change gear housing (5); and the vertical output gear (6) is mounted on the vertical bearing seat (7) via a bearing.

3. A driving and transmission device for a counter-rotating propeller test in a wind tunnel according to claim 2, characterized in that: The wing-shaped support rod assembly (40) further comprises a height adjustment member (9), a lower support rod (10), a lower support rod bearing seat (11), an upper support rod (16), an upper support rod bearing seat (15), a support rod middle section coupling (14), and a transmission shaft; The transmission shaft comprises a lower transmission shaft (12) and an upper transmission shaft (17), and the lower transmission shaft (12) and the upper transmission shaft (17) are connected via a support rod middle section coupling (14); The height adjustment member (9) is mounted on the speed change gear housing (5), a lower support rod (10) is fixedly mounted on the inner side of the height adjustment member (9), and the lower support rod (10) is sleeved on the outside of the lower transmission shaft (12) via a bearing and a lower support rod bearing seat (11); An upper support rod (16) is mounted on the upper end of the lower support rod (10), and the upper support rod (16) is sleeved on the outside of the upper transmission shaft (17) via a bearing and an upper support rod bearing seat (15).

4. A driving and transmission device for a counter-rotating propeller test in a wind tunnel according to claim 3, characterized in that: The angle gear box (41) further comprises an angle gear box body (29) and an angle gear box body shell; The angle gear housing (29) is fixedly connected to the upper support rod (16), the angle input gear (35) is fixedly connected to the upper transmission shaft (17), the angle output gear (36) is installed in the angle gear housing (29) via a bearing and a bearing seat, and the inner ring of the angle output gear (36) is fixedly connected to the angle output shaft (28).

5. A driving and transmission device for a counter-rotating propeller test in a wind tunnel according to claim 4, characterized in that: The rear propeller output shaft assembly (42) further comprises a rear propeller bearing seat (23), a rear propeller transition connector (24), and a rear propeller force measuring balance (25); A rear propeller dynamometer (25) is provided between the rear propeller bearing seat (23) and the angle gear housing shell, the rear propeller dynamometer (25) being connected to the rear propeller bearing seat (23) via a rear propeller transition connector (24), and the rear propeller rotor shaft (21) being mounted on the rear propeller bearing seat (23) via a bearing.

6. The driving and transmission device for a counter-rotating propeller test in a wind tunnel according to claim 1, characterized in that: The front propeller output shaft assembly (43) further comprises a front propeller bearing seat (27), a front propeller force measuring balance (31), a front propeller torque balance (32), and a front propeller motor connecting piece (30); The front propeller bearing seat (27) is fixedly connected to the front propeller motor connecting piece (30), the front propeller force measuring balance (31) is installed in the front propeller motor connecting piece (30), the front propeller rotor shaft (19) is installed on the front propeller bearing seat (27) through a bearing, and the front propeller torque balance (32) is installed at the tail end of the front propeller rotor shaft (19); The front paddle drive motor (34) is mounted on the rear housing of the front paddle motor connector (30), and the output shaft of the front paddle drive motor (34) is connected to the front paddle torque balance (32) via a front paddle diaphragm coupling (33).

7. The driving and transmission device for a counter-rotating propeller test in a wind tunnel according to claim 1, characterized in that: The rear propeller drive motor (1) is composed of two 400 kW permanent magnet synchronous motors, and the output shafts of the rear propeller drive motor (1) have the same axis.

8. The driving and transmission device for a counter-rotating propeller test in a wind tunnel according to claim 1, characterized in that: The front propeller driving motor (34) is a 260 kW permanent magnet synchronous motor.

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