Coaxial contra-rotating motor for contra-rotating propeller thruster

Abstract

The invention provides a coaxial contra-rotating motor for a contra-rotating propeller thruster, which comprises an outer shaft motor assembly and an inner shaft motor assembly, and is characterized in that the inner shaft motor assembly is coaxially mounted on the rear side surface of an outer shaft rear end cover of the outer shaft motor assembly; a through hole for an inner shaft body of the inner shaft motor assembly to penetrate through is formed in the middle of the outer shaft rear end cover, and an outer shaft body of the outer shaft motor assembly is a hollow part; the inner shaft body penetrates through a middle through hole of the outer shaft rear end cover, the front end of the inner shaft body is coaxially arranged in the outer shaft body, and the front end of the inner shaft body and the front end of the outer shaft body are connected with two propellers of the contra-rotating propeller thruster. The inner shaft motor and the outer shaft motor can output different rotating speeds, and the rotating speeds of the front propeller and the rear propeller are finely adjusted under the condition that thrust meets the navigational speed requirement, so that rolling direction torques generated by the front propeller and the rear propeller are equal in size and opposite in direction, namely, no residual rolling torque generated by propeller design exists, and rolling control through a differential rudder angle is not used; and the resistance generated by the differential rudder angle during sailing is reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of underwater vehicles, and in particular to a coaxial counter-rotating motor for a counter-rotating propeller propeller. Background Art

[0002] Traditional underwater vehicles are propelled by a single propeller, but for some vehicles with special usage requirements, such as high-speed navigation, a single propeller is difficult to meet the usage requirements. A single propeller will generate a large torque around the longitudinal axis of the vehicle at high speeds, and it is impossible to achieve stable navigation at high speeds. Counter-rotating propellers have certain advantages because the two propellers of a counter-rotating propeller rotate in opposite directions, offsetting most of the torque, and the propulsion efficiency of a counter-rotating propeller is significantly higher than that of a single propeller, making it more suitable for high-speed navigation.

[0003] The traditional driving method of counter-rotating propellers is generally a single motor with a gearbox to drive the two propellers. This solution has a complex structure, low transmission efficiency, and a fixed speed ratio between the front and rear propellers, which still has certain disadvantages. Some solutions also use internal and external rotor motors, that is, the stator of the motor in the traditional sense is also used as a rotating component, so that the internal and external rotors rotate in opposite directions, thereby driving the internal and external propellers, but this type of motor has the possibility of losing control and is complex to process and assemble. For high-speed aircraft using counter-rotating propellers as a propulsion method, users' requirements for motors mainly include: (1) high transmission efficiency; (2) the structure is as simple as possible and easy to process and assemble; (3) the propeller's own roll residual torque is small; (4) the propeller is conducive to roll control. Summary of the invention

[0004] In view of the defects in the prior art, an object of the present invention is to provide a coaxial counter-rotating motor for a counter-rotating propeller propeller.

[0005] The coaxial counter-rotating motor for a counter-rotating propeller provided by the present invention comprises an outer shaft motor assembly and an inner shaft motor assembly, wherein the inner shaft motor assembly is coaxially mounted on the rear side of the outer shaft rear end cover of the outer shaft motor assembly;

[0006] A through hole is provided in the middle of the rear end cover of the outer shaft for the inner shaft body of the inner shaft motor assembly to pass through, and the outer shaft body of the outer shaft motor assembly includes a hollow portion;

[0007] The inner shaft body passes through the middle through hole of the rear end cover of the outer shaft, and the front end of the inner shaft body is coaxial and gap is arranged inside the hollow part of the outer shaft body, and the front end of the inner shaft body and the front end of the outer shaft body are respectively used to connect the two propellers of the counter-rotating propeller thruster.

[0008] Preferably, the outer shaft motor assembly comprises an outer shaft body, an outer shaft stator, an outer shaft housing, an outer shaft rear end cover, an outer shaft rotor and an outer shaft front end cover;

[0009] The outer shaft rotor is fixedly mounted on the outside of the outer shaft body, the outer shaft stator is fixedly mounted on the inside of the outer shaft housing and sleeved on the outside of the outer shaft rotor, and the outer shaft front end cover and the outer shaft rear end cover are respectively mounted on the front and rear ends of the outer shaft housing;

[0010] The outer shaft body is connected with the outer shaft front end cover and the outer shaft rear end cover through bearings.

[0011] Preferably, the inner shaft motor assembly comprises an inner shaft stator, an inner shaft housing, an inner shaft rear end cover, an inner shaft rotor and an inner shaft body;

[0012] The inner shaft rotor is fixedly mounted on the outside of the inner shaft body, the inner shaft stator is fixedly mounted on the inside of the inner shaft casing and sleeved on the outside of the inner shaft rotor, the inner shaft rear end cover is mounted on the rear end of the inner shaft casing, and the front end of the inner shaft casing is connected to the outer shaft rear end cover;

[0013] The inner shaft body is connected with the inner shaft rear end cover and the outer shaft rear end cover through a bearing.

[0014] Preferably, both front and rear sides of the inner side of the rear end cover of the outer shaft protrude axially to form a bearing mounting portion, and the inner shaft body and the outer shaft body are rotatably connected to the bearing mounting portion via a bearing.

[0015] Preferably, a shaft shoulder is provided on the inner shaft body, and the inner shaft body comprises a first shaft section and a second shaft section located on both sides of the shaft shoulder;

[0016] The radius of the first shaft segment is larger than the radius of the inner edge of the hollow portion of the outer shaft body, the radius of the second shaft segment is smaller than the radius of the inner edge of the hollow portion of the outer shaft body, and the second shaft segment is coaxially installed inside the hollow portion of the outer shaft body.

[0017] Preferably, the external shaft motor assembly further comprises an external shaft encoder and an external shaft encoder cover plate, wherein the external shaft encoder is fixedly mounted on the front side of the external shaft front end cover and sleeved on the front end outside of the external shaft body;

[0018] The outer shaft encoder cover plate is installed on the front side of the outer shaft encoder cover plate, and the outer edge of the outer shaft encoder cover plate is connected to the front side of the outer shaft front end cover.

[0019] Preferably, the outer shaft motor assembly further comprises an outer shaft pressing sleeve, and the outer shaft pressing sleeve is installed at the front end of the outer shaft body.

[0020] Preferably, the inner shaft motor assembly further comprises an inner shaft encoder, an inner shaft encoder pressing sheet and an inner shaft encoder cover plate;

[0021] The inner shaft encoder cover plate, the inner shaft encoder pressing plate and the inner shaft encoder are coaxially installed on the rear end of the inner shaft body in sequence from back to front, and the inner shaft encoder is sleeved on the outside of the rear end of the inner shaft body.

[0022] Preferably, the inner shaft motor assembly further comprises an inner shaft wire pressing cover, and the inner shaft wire pressing cover is installed on the rear side of the inner shaft encoder cover plate.

[0023] Preferably, the front end of the inner shaft housing of the inner shaft motor assembly is fixedly connected to the rear end cover of the outer shaft by screws.

[0024] Compared with the prior art, the present invention has the following beneficial effects:

[0025] 1. The present invention forms a coaxial counter-rotating motor through an inner shaft motor assembly and an outer shaft motor assembly, wherein the inner and outer shaft motors can be independently controlled, that is, the inner shaft motor and the outer shaft motor can output different rotational speeds, and can drive the front and rear propellers of the counter-rotating propeller to rotate at different rotational speeds. Under the condition of ensuring that the thrust meets the speed requirement, the rotational speeds of the front and rear propellers are fine-tuned so that the propulsion system generates a certain roll direction torque to offset the residual roll torque generated by the propeller design, rather than using differential rudder angles for roll control, thereby reducing the complexity of roll control and reducing the resistance caused by differential rudder angles during navigation.

[0026] 2. The present invention is formed by installing an inner shaft motor assembly and an outer shaft motor assembly, and has a simple structure and is easy to assemble. The structural parts involved are easy to process, and the parts required by the inner and outer shaft motor assemblies are highly similar, which is convenient for processing. Therefore, the above-mentioned coaxial counter-rotating motor for counter-rotating propeller propellers is suitable for mass production. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Other features, objects and advantages of the present invention will become more apparent from the detailed description of non-limiting embodiments made with reference to the following drawings:

[0028] Figure 1 It is a cross-sectional structural schematic diagram of the present invention;

[0029] Figure 2 It is a schematic diagram of the explosion structure of the present invention;

[0030] Figure 3 It is a schematic diagram of the overall structure of the present invention.

[0031] The figure shows:

[0032] Outer shaft body 1 Outer shaft rear end cover 15

[0033] First bearing 2 outer shaft rotor 16

[0034] Outer shaft stator 3 Second bearing 17

[0035] Outer shaft housing 4 Outer shaft front end cover 18

[0036] Inner shaft stator 5 Third screw 19

[0037] Inner shaft housing 6 Outer shaft encoder 20

[0038] Inner shaft encoder 7 Fourth screw 21

[0039] Inner shaft encoder pressing plate 8 Outer shaft encoder cover plate 22

[0040] Inner shaft wire cover 9 Outer shaft pressure sleeve 23

[0041] First screw 10 Fifth screw 24

[0042] Inner shaft encoder cover 11 Inner shaft body 25

[0043] Second screw 12 Third bearing 26

[0044] Inner shaft rear end cover 13 Fourth bearing 27

[0045] Inner shaft rotor 14 DETAILED DESCRIPTION

[0046] The present invention is described in detail below in conjunction with specific embodiments. The following embodiments will help those skilled in the art to further understand the present invention, but are not intended to limit the present invention in any form. It should be noted that, for those of ordinary skill in the art, several changes and improvements can also be made without departing from the concept of the present invention. These all belong to the protection scope of the present invention.

[0047] The present invention discloses a coaxial counter-rotating motor for a counter-rotating propeller propeller, wherein the inner and outer shaft motors can be independently controlled respectively, and can drive the front and rear propellers of the counter-rotating propeller to rotate at different speeds. By fine-tuning the speeds of the front and rear propellers, the propulsion system can generate a certain roll direction torque to offset the residual roll torque generated by the propeller design, rather than using differential rudder angles for roll control, thereby reducing the complexity of roll control and reducing the resistance caused by the differential rudder angle during navigation.

[0048] According to the present invention, a coaxial counter-rotating motor for a counter-rotating propeller is provided. Figure 1 , Figure 2As shown, it includes an outer shaft motor assembly and an inner shaft motor assembly, the inner shaft motor assembly is coaxially mounted on the rear side of the outer shaft rear end cover 15 of the outer shaft motor assembly; the middle part of the outer shaft rear end cover 15 is provided with a through hole for the inner shaft body 25 of the inner shaft motor assembly to pass through, and the outer shaft body 1 of the outer shaft motor assembly includes a hollow part; the inner shaft body 25 passes through the middle through hole of the outer shaft rear end cover 15, and the front end of the inner shaft body 25 is coaxial and the gap is arranged inside the hollow part of the outer shaft body 1, and the front end of the inner shaft body 25 and the front end of the outer shaft body 1 are respectively used to connect the two propellers of the counter-rotating propeller propeller. The coaxial counter-rotating motor has a compact structure, and the inner shaft body 25 and the outer shaft body 1 do not interfere with each other, and can independently output different speeds.

[0049] Specifically, the outer shaft motor assembly includes an outer shaft body 1, an outer shaft stator 3, an outer shaft housing 4, an outer shaft rear end cover 15, an outer shaft rotor 16 and an outer shaft front end cover 18; the outer shaft rotor 16 is fixedly installed on the outside of the outer shaft body 1, the outer shaft stator 3 is fixedly installed on the inside of the outer shaft housing 4, and is sleeved on the outside of the outer shaft rotor 16, the outer shaft front end cover 18 and the outer shaft rear end cover 15 are respectively installed on the front and rear ends of the outer shaft housing 4; the outer shaft body 1 is connected to the outer shaft front end cover 18 and the outer shaft rear end cover 15 through bearings.

[0050] The external shaft motor assembly further includes an external shaft encoder 20, an external shaft encoder cover plate 22 and an external shaft pressing sleeve 23. The external shaft encoder 20 is fixedly mounted on the front side of the external shaft front end cover 18 and sleeved on the front end of the external shaft body 1. The external shaft encoder cover plate 22 is mounted on the front side of the external shaft encoder cover plate 22, and the outer edge of the external shaft encoder cover plate 22 is connected to the front side of the external shaft front end cover 18. The external shaft pressing sleeve 23 is mounted on the front end of the external shaft body 1.

[0051] The inner shaft motor assembly includes an inner shaft stator 5, an inner shaft housing 6, an inner shaft rear end cover 13, an inner shaft rotor 14 and an inner shaft body 25; the inner shaft rotor 14 is fixedly mounted on the outside of the inner shaft body 25, the inner shaft stator 5 is fixedly mounted on the inside of the inner shaft housing 6 and sleeved on the outside of the inner shaft rotor 14, the inner shaft rear end cover 13 is mounted on the rear end of the inner shaft housing 6, and the front end of the inner shaft housing 6 is connected to the outer shaft rear end cover 15; the inner shaft body 25 is connected to the inner shaft rear end cover 13 and the outer shaft rear end cover 15 through a bearing. The front end of the inner shaft housing 6 is fixedly connected to the outer shaft rear end cover 15 through a screw.

[0052] The inner shaft motor assembly further includes an inner shaft encoder 7, an inner shaft encoder pressing sheet 8, an inner shaft pressing wire cover 9 and an inner shaft encoder cover plate 11; the inner shaft encoder cover plate 11, the inner shaft encoder pressing sheet 8 and the inner shaft encoder 7 are coaxially mounted on the rear end of the inner shaft body 25 in sequence from back to front, and the inner shaft encoder 7 is sleeved on the outside of the rear end of the inner shaft body 25. The inner shaft pressing wire cover 9 is mounted on the rear side of the inner shaft encoder cover plate 11.

[0053] The front and rear sides of the inner side of the rear end cover 15 of the outer shaft are both axially protruding to form a bearing mounting portion, and the inner shaft body 25 and the outer shaft body 1 are both rotatably connected to the bearing mounting portion through a bearing. A shaft shoulder is provided on the inner shaft body 25, and the inner shaft body 25 includes a first shaft segment and a second shaft segment located on both sides of the shaft shoulder; the radius of the first shaft segment is greater than the radius of the inner edge of the hollow portion of the outer shaft body 1, and the radius of the second shaft segment is smaller than the radius of the inner edge of the hollow portion of the outer shaft body 1, and the second shaft segment is coaxially mounted inside the hollow portion of the outer shaft body 1.

[0054] Example 1

[0055] This embodiment discloses a coaxial counter-rotating motor for a counter-rotating propeller propeller, including a structural mounting assembly, an inner shaft motor and an outer shaft motor, wherein the two motor assemblies are used to drive propellers on the inner and outer shaft systems, respectively.

[0056] Furthermore, the structural mounting assembly includes an inner shaft housing 6, an outer shaft housing 4, an inner shaft rear end cover 13, an outer shaft front end cover 18 and an outer shaft rear end cover 15. The inner shaft housing 6 and the outer shaft housing 4 are fixedly connected to both sides of the outer shaft rear end cover 18. The inner shaft housing 6 and the outer shaft housing 4 have gear-shaped grooves on their exteriors for accelerating the heat dissipation of the motor; the inner shaft rear end cover 13 is fixedly connected to the inner shaft housing 6; the outer shaft front end cover 18 is fixedly connected to the outer shaft housing 4. The inner shaft rear end cover 13 has a boss on one side, and the boss has a through hole for connecting to the aircraft shell. The inner shaft rear end cover 13 has a boss, and the boss can be connected to the aircraft shell through heat dissipation silicone grease to accelerate the heat dissipation of the motor.

[0057] Further, the inner shaft motor includes an inner shaft rotor 14, an inner shaft stator 5, an inner shaft bearing, and an inner shaft body 25. The inner shaft stator 5 is attached to the inner shaft housing 6, the inner shaft housing 6 is connected and fixed to the inner shaft rear end cover 13 on the side, the inner shaft rotor 5 is attached to the inner shaft body 25, and the two ends of the inner shaft body 25 are connected and fixed to the inner shaft bearing inner rotor, so that the inner shaft body 25 and the inner shaft rotor 5 can rotate freely around the axis, and the inner shaft encoder 7, the inner shaft wire cover 9, and the inner shaft encoder cover plate 11 are installed on the side of the inner shaft motor for power supply, signal transmission, speed measurement, etc.

[0058] Furthermore, the outer shaft motor includes an outer shaft rotor 16, an outer shaft stator 3, an outer shaft bearing, and an outer shaft body 1. The outer shaft stator 3 is attached to the outer shaft housing 4, the side of the outer shaft housing 4 is connected and fixed to the outer shaft rear end cover 15, the outer shaft rotor 16 is attached to the outer shaft body 1, and the two ends of the outer shaft body 1 are connected and fixed to the inner rotor of the outer shaft bearing, so that the outer shaft body 1 and the outer shaft rotor can rotate freely around the axis, and the side of the outer shaft motor is installed with an outer shaft encoder 20, an outer shaft wire cover, and an outer shaft encoder cover 18 for power supply, signal transmission, and speed measurement.

[0059] Example 2

[0060] This embodiment, as a preferred example of embodiment 1, provides a coaxial counter-rotating motor for a counter-rotating propeller propeller, wherein the inner shaft encoder 7 and the outer shaft encoder 20 are both resolver encoders, the inner shaft encoder cover plate 11 is mounted on the inner shaft rear end cover 13 by a first screw 10, the inner shaft rear end cover 13 is mounted on the inner shaft housing 6 by a second screw 12, the outer shaft front end cover 18 is mounted on the outer shaft housing 4 by a third screw 19, the outer shaft encoder cover plate 22 is mounted on the outer shaft front end cover 18 by a fourth screw 21, and the outer shaft pressing sleeve 23 is mounted on the outer shaft front end cover 18 by a fifth screw 24; preferably, the first screw 10 is an M3 screw, the second screw 12 is an M6 screw, the third screw 19 is an M6 screw, the fourth screw 21 is an M6 screw, and the fifth screw 24 is an M3 screw;

[0061] The front and rear ends of the outer shaft body 1 are respectively provided with a second bearing 17 and a first bearing 2, and the front and rear ends of the inner shaft body 25 are respectively provided with a third bearing 26 and a fourth bearing 27. Preferably, the first bearing 2 is a 6012 bearing, and the second bearing 17 is a 6013 bearing.

[0062] In the description of the present application, it should be understood that the terms "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0063] The above describes the specific embodiments of the present invention. It should be understood that the present invention is not limited to the above specific embodiments, and those skilled in the art can make various changes or modifications within the scope of the claims, which does not affect the essence of the present invention. In the absence of conflict, the embodiments of the present application and the features in the embodiments can be combined with each other arbitrarily.

Claims

1. A coaxial counter-rotating motor for a counter-rotating propeller, characterized in that: It comprises an outer shaft motor assembly and an inner shaft motor assembly, wherein the inner shaft motor assembly is coaxially mounted on the rear side of an outer shaft rear end cover (15) of the outer shaft motor assembly; A through hole is provided in the middle of the rear end cover (15) of the outer shaft for allowing the inner shaft body (25) of the inner shaft motor assembly to pass through, and the outer shaft body (1) of the outer shaft motor assembly includes a hollow portion; The inner shaft body (25) passes through the middle through hole of the rear end cover (15) of the outer shaft, and the front end of the inner shaft body (25) is coaxially and gap-arranged inside the hollow portion of the outer shaft body (1), and the front end of the inner shaft body (25) and the front end of the outer shaft body (1) are respectively used to connect the two propellers of the counter-rotating propeller propeller.

2. The coaxial counter-rotating motor for a counter-rotating propeller according to claim 1, characterized in that: The outer shaft motor assembly comprises an outer shaft body (1), an outer shaft stator (3), an outer shaft housing (4), an outer shaft rear end cover (15), an outer shaft rotor (16) and an outer shaft front end cover (18); The outer shaft rotor (16) is fixedly mounted on the outside of the outer shaft body (1); the outer shaft stator (3) is fixedly mounted on the inside of the outer shaft housing (4) and sleeved on the outside of the outer shaft rotor (16); the outer shaft front end cover (18) and the outer shaft rear end cover (15) are respectively mounted on the front and rear ends of the outer shaft housing (4); The outer shaft body (1) is connected to the outer shaft front end cover (18) and the outer shaft rear end cover (15) via bearings.

3. The coaxial counter-rotating motor for a counter-rotating propeller according to claim 1, characterized in that: The inner shaft motor assembly comprises an inner shaft stator (5), an inner shaft housing (6), an inner shaft rear end cover (13), an inner shaft rotor (14) and an inner shaft body (25); The inner shaft rotor (14) is fixedly mounted on the outside of the inner shaft body (25); the inner shaft stator (5) is fixedly mounted on the inside of the inner shaft casing (6) and sleeved on the outside of the inner shaft rotor (14); the inner shaft rear end cover (13) is mounted on the rear end of the inner shaft casing (6); and the front end of the inner shaft casing (6) is connected to the outer shaft rear end cover (15); The inner shaft body (25) is connected to the inner shaft rear end cover (13) and the outer shaft rear end cover (15) via a bearing.

4. The coaxial counter-rotating motor for a counter-rotating propeller according to claim 1, characterized in that: The front and rear sides of the inner side of the rear end cover (15) of the outer shaft both protrude axially to form a bearing mounting portion, and the inner shaft body (25) and the outer shaft body (1) are both rotatably connected to the bearing mounting portion via bearings.

5. The coaxial counter-rotating motor for a counter-rotating propeller according to claim 1, characterized in that: The inner shaft body (25) is provided with a shaft shoulder, and the inner shaft body (25) comprises a first shaft section and a second shaft section located on both sides of the shaft shoulder; The radius of the first shaft section is greater than the radius of the inner edge of the hollow portion of the outer shaft body (1), the radius of the second shaft section is smaller than the radius of the inner edge of the hollow portion of the outer shaft body (1), and the second shaft section is coaxially mounted inside the hollow portion of the outer shaft body (1).

6. The coaxial counter-rotating motor for a counter-rotating propeller according to claim 2, characterized in that: The external shaft motor assembly further comprises an external shaft encoder (20) and an external shaft encoder cover plate (22); the external shaft encoder (20) is fixedly mounted on the front side of the external shaft front end cover (18) and sleeved on the front end of the external shaft body (1); The outer shaft encoder cover plate (22) is installed on the front side of the outer shaft encoder cover plate (22), and the outer edge of the outer shaft encoder cover plate (22) is connected to the front side of the outer shaft front end cover (18).

7. The coaxial counter-rotating motor for a counter-rotating propeller according to claim 2, characterized in that: The outer shaft motor assembly further comprises an outer shaft pressing sleeve (23), and the outer shaft pressing sleeve (23) is mounted on the front end of the outer shaft body (1).

8. The coaxial counter-rotating motor for a counter-rotating propeller according to claim 3, characterized in that: The inner shaft motor assembly also includes an inner shaft encoder (7), an inner shaft encoder pressing sheet (8) and an inner shaft encoder cover plate (11); The inner shaft encoder cover plate (11), the inner shaft encoder pressing plate (8) and the inner shaft encoder (7) are coaxially mounted on the rear end of the inner shaft body (25) in sequence from back to front, and the inner shaft encoder (7) is sleeved on the outside of the rear end of the inner shaft body (25).

9. The coaxial counter-rotating motor for a counter-rotating propeller according to claim 8, characterized in that: The inner shaft motor assembly further comprises an inner shaft wire pressing cover (9), and the inner shaft wire pressing cover (9) is mounted on the rear side of the inner shaft encoder cover plate (11).

10. The coaxial counter-rotating motor for a counter-rotating propeller according to claim 1, characterized in that: The front end of the inner shaft housing (6) of the inner shaft motor assembly is fixedly connected to the outer shaft rear end cover (15) by means of screws.

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