A coaxial high-speed helicopter tail rotor propulsion drive system structure

Abstract

The present invention discloses a coaxial high-speed helicopter tail rotor propulsion transmission system structure, comprising an input shaft, an output shaft, a torque transmission structure, a clutch structure and a locking structure; the torque transmission structure comprises a torque transmission structure piston, an outer sleeve of the torque transmission structure piston and a torque transmission sleeve; the clutch structure comprises a clutch structure piston, a pair of steel plates, a friction plate and a clutch structure end cover; a driven end spline is provided on the output shaft near the clutch structure end cover, the tail end of the torque transmission sleeve extends to the clutch structure end cover, and a keyway that can be connected to the driven end spline is provided on the inner wall of the tail end of the torque transmission sleeve; an output shaft clamp is provided on the outer wall of the tail end of the output shaft; the locking structure comprises a locking structure sleeve and a locking structure piston; the present invention can realize the conversion between the low-power and high-power states of the tail rotor of the high-speed helicopter during high-speed flight, and at the same time realize the braking of the main rotor under specific circumstances.

Description

Technical Field

[0001] The present invention relates to the technical field of transmission systems, and in particular to a coaxial high-speed helicopter tail rotor propulsion transmission system structure. Background Art

[0002] A coaxial high-speed helicopter is a helicopter with a special configuration, characterized by two relatively rotating main rotors, that is, the two rotors rotate on the same axis, but in opposite directions. The twin-rotor design improves the flight stability and maneuverability of the helicopter; the coaxial inverted helicopter also has good hovering stability and maneuverability, and is suitable for performing special tasks and operations, such as medical rescue, search and rescue, patrol, etc.

[0003] The transmission system of a coaxial high-speed helicopter consists of a coaxial counter-rotating main drive system and a tail propulsion drive system. The main drive system transmits a certain proportion of the engine's output power to the coaxial twin rotors, enabling the helicopter's hovering, takeoff, landing, and low-speed flight. The tail propulsion drive system provides the engine's driving force to the tail propulsion rotor during high-speed flight, providing the helicopter with horizontal propulsion. To prevent tail rotor power consumption during hovering and low-speed flight, tail rotor power transmission needs to be disconnected to ensure efficient flight. When the helicopter lands, the tail propulsion drive system can brake the main rotor.

[0004] The tail rotor propulsion drive system is a key component of the tail rotor drive system for new coaxial high-speed helicopters. It integrates functions such as controlling tail rotor rotation and braking the main rotor. Existing mechanical structures often use clutches and planetary reducers to transmit tail rotor power, making it difficult to achieve high power, high torque, and high speed transmission during high-speed flight. Summary of the Invention

[0005] The purpose of the present invention is to provide a coaxial high-speed helicopter tail rotor propulsion transmission system structure to solve the problems existing in the above-mentioned prior art and to achieve the transmission of high power, high torque and high speed during high-speed flight.

[0006] To achieve the above object, the present invention provides the following solutions:

[0007] The present invention provides a coaxial high-speed helicopter tail rotor propulsion transmission system structure, comprising an input shaft, an output shaft, a torque transmission structure, a clutch structure and a locking structure;

[0008] The torque transmission structure includes a torque transmission structure piston, a torque transmission structure piston outer sleeve, and a torque transmission sleeve; the torque transmission structure piston outer sleeve is sleeved on the outside of the input shaft, the torque transmission structure piston is arranged in the torque transmission structure piston outer sleeve, an oil chamber 1 is formed between the head end of the torque transmission structure piston and the bottom of the torque transmission structure piston outer sleeve, a torque transmission structure pressure oil inlet connected to the oil chamber 1 is provided on the input shaft, the torque transmission sleeve is slidably connected to the outside of the input shaft through the input shaft spline, and the head end of the torque transmission sleeve is cooperatively connected to the torque transmission structure piston;

[0009] The clutch structure includes a clutch structure piston, a pair of steel plates, a friction plate and a clutch structure end cover; an annular brake groove is provided at the end of the input shaft, the clutch structure piston is arranged in the brake groove, and the head end of the clutch structure piston and the bottom of the brake groove form an oil chamber 2, the input shaft is provided with a clutch structure pressure oil inlet connected to the oil chamber 2, the head end of the output shaft extends into the brake groove, an annular mounting groove is formed between the outer wall of the output shaft and the inner wall of the brake groove, the head end of the annular mounting groove is opposite to the tail end of the clutch structure piston, and the tail end of the annular mounting groove is blocked by the clutch structure end cover, the pair of steel plates and the friction plates are provided with multiple pieces and are arranged alternately;

[0010] A driven end spline is provided on the output shaft near the end cover of the clutch structure, the rear end of the torque transmission sleeve extends to the end cover of the clutch structure, and a keyway capable of connecting with the driven end spline is provided on the inner wall of the rear end of the torque transmission sleeve;

[0011] An output shaft clamping platform is provided on the outer wall of the tail end of the output shaft;

[0012] The locking structure includes a locking structure sleeve and a locking structure piston. The locking structure sleeve is sleeved on the outside of the output shaft. A high-pressure oil chamber and a low-pressure oil chamber are provided between the locking structure sleeve and the locking structure piston. The high-pressure oil chamber is connected to the first oil inlet of the locking structure, and the low-pressure oil chamber is connected to the second oil inlet of the locking structure. The head end of the locking structure piston is provided with a boss that cooperates with the output shaft clamp. The boss can be clamped with the output shaft clamp to limit the output shaft from rotating.

[0013] Preferably, an annular groove is provided at the tail end of the outer sleeve of the torque transmission structure piston, and a second return spring is provided in the annular groove. The first end of the second return spring is connected to the outer wall of the torque transmission sleeve, and the tail end of the second return spring is connected to the tail end groove wall of the annular groove.

[0014] Preferably, an input shaft spline retaining ring is provided on the input shaft.

[0015] Preferably, a support plate is provided on the inner wall of the brake groove close to the axis of the input shaft, the support plate is located at the tail end of the clutch structure piston, and a return spring 1 is provided between the support plate and the clutch structure piston.

[0016] Preferably, a driven end spline retaining ring is provided on the output shaft.

[0017] Compared with the prior art, the present invention has achieved the following beneficial technical effects:

[0018] The coaxial high-speed helicopter tail rotor propulsion transmission system structure provided by the present invention has a compact overall structure. The friction clutch can achieve relatively small power transmission. For the transmission of larger power, a spline structure is selected for transmission, which can realize the transmission of high power, high torque and high speed during high-speed flight. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0020] Figure 1 This is a schematic structural diagram of the coaxial high-speed helicopter tail rotor propulsion transmission system structure of the present invention;

[0021] In the figure: 1. Input shaft; 2. Pressure oil inlet of torque transmission structure; 3. Torque transmission structure piston; 4. Outer sleeve of torque transmission structure piston; 5. Torque transmission sleeve; 6. Clutch structure piston; 7. Dual steel plates; 8. Friction plate; 9. Driven end spline; 10. Output shaft clamp; 11. Locking structure piston; 12. Locking structure piston sleeve; 13. Output shaft; 14. Locking structure oil inlet 1; 15. Locking structure oil inlet 2; 16. Driven end spline retaining ring; 17. Clutch structure end cover; 18. Return spring 1; 19. Return spring 2; 20. Input shaft spline; 21. Input shaft spline retaining ring; 22. Pressure oil inlet of clutch structure. DETAILED DESCRIPTION

[0022] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0023] The purpose of the present invention is to provide a coaxial high-speed helicopter tail rotor propulsion transmission system structure to solve the problems existing in the prior art.

[0024] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0025] The coaxial high-speed helicopter tail rotor propulsion transmission system structure in this embodiment is as follows: Figure 1 As shown, it includes an input shaft 1, an output shaft 13, a torque transmission structure, a clutch structure and a locking structure;

[0026] The torque transmission structure includes a torque transmission structure piston 3, a torque transmission structure piston outer sleeve 4, and a torque transmission sleeve 5; the torque transmission structure piston outer sleeve 4 is sleeved on the outside of the input shaft 1, and the torque transmission structure piston 3 is arranged in the torque transmission structure piston outer sleeve 4. An oil chamber 1 is formed between the head end of the torque transmission structure piston 3 and the bottom of the torque transmission structure piston outer sleeve 4. A torque transmission structure pressure oil inlet 2 connected to the oil chamber 1 is provided on the input shaft 1. The torque transmission sleeve 5 is slidably connected to the outside of the input shaft 1 through the input shaft spline 20, and the head end of the torque transmission sleeve 5 is cooperatively connected to the torque transmission structure piston 3;

[0027] The clutch structure includes a clutch structure piston 6, a dual steel plate 7, a friction plate 8 and a clutch structure end cover 17; an annular brake groove is provided at the end of the input shaft 1, and the clutch structure piston 6 is arranged in the brake groove, and the head end of the clutch structure piston 6 and the bottom of the brake groove form an oil chamber 2, and a clutch structure pressure oil inlet 22 connected to the oil chamber 2 is provided on the input shaft 1. The head end of the output shaft 13 extends into the brake groove, and an annular mounting groove is formed between the outer wall of the output shaft 13 and the inner wall of the brake groove. The head end of the annular mounting groove is opposite to the tail end of the clutch structure piston 6, and the tail end of the annular mounting groove is blocked by the clutch structure end cover 17. The dual steel plates 7 and the friction plates 8 are provided with multiple pieces and are arranged alternately;

[0028] A driven end spline 9 is provided on the output shaft 13 near the clutch structure end cover 17. The rear end of the torque transmission sleeve 5 extends to the clutch structure end cover 17, and a keyway is provided on the inner wall of the rear end of the torque transmission sleeve 5 to connect with the driven end spline 9.

[0029] An output shaft clamping platform 10 is provided on the outer wall of the tail end of the output shaft 13;

[0030] The locking structure includes a locking structure sleeve and a locking structure piston 11. The locking structure sleeve is sleeved on the outside of the output shaft 13. A high-pressure oil chamber and a low-pressure oil chamber are arranged between the locking structure sleeve and the locking structure piston 11. The high-pressure oil chamber is connected to the locking structure oil inlet 14, and the low-pressure oil chamber is connected to the locking structure oil inlet 2 15. The head end of the locking structure piston 11 is provided with a boss that cooperates with the output shaft clamp 10. The boss can be clamped with the output shaft clamp 10 to limit the output shaft 13 and prevent it from rotating.

[0031] In this specific embodiment, an annular groove is provided at the tail end of the outer sleeve 4 of the torque transmission structure piston, and a return spring 2 19 is provided in the annular groove. The head end of the return spring 2 19 is connected to the outer wall of the torque transmission sleeve 5, and the tail end of the return spring 2 19 is connected to the tail end groove wall of the annular groove.

[0032] In this specific embodiment, an input shaft spline retaining ring 21 is provided on the input shaft 1 .

[0033] In this specific embodiment, a support plate is provided on the inner wall of the brake groove near the axis of the input shaft 1. The support plate is located at the tail end of the clutch structure piston 6, and a return spring 18 is provided between the support plate and the clutch structure piston 6.

[0034] In this specific embodiment, a driven end spline retaining ring 16 is provided on the output shaft 13 .

[0035] The coaxial high-speed helicopter tail rotor propulsion transmission system structure in the present invention works as follows:

[0036] (1) The clutch structure is used for low-power transmission. The pressure oil enters from the clutch structure pressure oil inlet 22, pushing the clutch structure piston 6 to the right, so that the dual steel plate 7 presses the friction plate 8 to form a friction pair, and the torque is transmitted through the friction pair;

[0037] (2) High power transmission uses the clutch structure and the torque transmission structure at the same time, maintaining the working state of step (1), and the pressure oil enters from the pressure oil inlet 2 of the torque transmission structure, pushing the torque transmission structure piston 3 to move to the right. At this time, the torque transmission structure piston 3 pushes the torque transmission sleeve 5 to move to the right synchronously, completing the engagement of the torque transmission sleeve 5 with the driven end spline 9, and transmitting high torque through the spline pair;

[0038] (3) After the high power transmission is completed, the pressure oil in the oil chamber 2 is released, and the torque transmission sleeve 5 returns to its original position under the elastic force of the return spring 2 19;

[0039] (4) After the low-power transmission is completed, the pressure oil in the oil chamber 1 is released, and the clutch structure piston 6 returns to its original position under the elastic force of the return spring 18. At this time, the system power transmission is disconnected;

[0040] (5) High-pressure oil enters from the locking structure oil inlet 14, and low-pressure oil enters from the locking structure oil inlet 2 15. Under the action of the pressure difference, the locking structure piston 11 is pushed to the left. The left boss of the locking structure piston 11 is stuck with the output shaft clamping platform 10, so that it cannot rotate. At this time, the output shaft 13 cannot rotate. The pressure oil enters from the clutch structure pressure oil inlet 22 and pushes the torque transmission structure piston 3 to the right. Under the action of the oil pressure, the clutch structure piston 6 pushes the dual steel plate 7 to press against the friction plate 8, forming a brake pair, which stops the torque transmitted by the input shaft 1;

[0041] (6) After braking, high-pressure oil enters from the locking structure oil inlet 2 15, and low-pressure oil enters from the locking structure oil inlet 1 14. Under the action of the pressure difference, the locking structure piston 11 moves to the right, and the locking structure piston 11 separates from the output shaft clamp 10, and the braking of the output shaft 13 is completed.

[0042] The present invention uses specific examples to illustrate the principles and implementation methods of the present invention. The above examples are only intended to help understand the method and core concept of the present invention. At the same time, those skilled in the art will find that the specific implementation methods and application scopes may vary based on the concept of the present invention. In summary, the contents of this specification should not be understood as limiting the present invention.

Claims

1. A coaxial high-speed helicopter tail rotor propulsion transmission system structure, characterized by: It includes input shaft, output shaft, torque transmission structure, clutch structure and locking structure; The torque transmission structure includes a torque transmission structure piston, a torque transmission structure piston outer sleeve, and a torque transmission sleeve; the torque transmission structure piston outer sleeve is sleeved on the outside of the input shaft, the torque transmission structure piston is arranged in the torque transmission structure piston outer sleeve, an oil chamber 1 is formed between the head end of the torque transmission structure piston and the bottom of the torque transmission structure piston outer sleeve, a torque transmission structure pressure oil inlet connected to the oil chamber 1 is provided on the input shaft, the torque transmission sleeve is slidably connected to the outside of the input shaft through the input shaft spline, and the head end of the torque transmission sleeve is cooperatively connected to the torque transmission structure piston; The clutch structure includes a clutch structure piston, a pair of steel plates, a friction plate and a clutch structure end cover; an annular brake groove is provided at the end of the input shaft, the clutch structure piston is arranged in the brake groove, and the head end of the clutch structure piston and the bottom of the brake groove form an oil chamber 2, the input shaft is provided with a clutch structure pressure oil inlet connected to the oil chamber 2, the head end of the output shaft extends into the brake groove, an annular mounting groove is formed between the outer wall of the output shaft and the inner wall of the brake groove, the head end of the annular mounting groove is opposite to the tail end of the clutch structure piston, and the tail end of the annular mounting groove is blocked by the clutch structure end cover, the pair of steel plates and the friction plates are provided with multiple pieces and are arranged alternately; A driven end spline is provided on the output shaft near the end cover of the clutch structure, the rear end of the torque transmission sleeve extends to the end cover of the clutch structure, and a keyway capable of connecting with the driven end spline is provided on the inner wall of the rear end of the torque transmission sleeve; An output shaft clamping platform is provided on the outer wall of the tail end of the output shaft; The locking structure includes a locking structure sleeve and a locking structure piston. The locking structure sleeve is sleeved on the outside of the output shaft. A high-pressure oil chamber and a low-pressure oil chamber are provided between the locking structure sleeve and the locking structure piston. The high-pressure oil chamber is connected to the first oil inlet of the locking structure, and the low-pressure oil chamber is connected to the second oil inlet of the locking structure. The head end of the locking structure piston is provided with a boss that cooperates with the output shaft clamp. The boss can be clamped with the output shaft clamp to limit the output shaft from rotating.

2. The coaxial high-speed helicopter tail rotor propulsion transmission system structure according to claim 1 is characterized in that: The tail end of the outer sleeve of the torque transmission structure piston is provided with an annular groove, and a return spring 2 is provided in the annular groove. The head end of the return spring 2 is connected to the outer wall of the torque transmission sleeve, and the tail end of the return spring 2 is connected to the tail end groove wall of the annular groove.

3. The coaxial high-speed helicopter tail rotor propulsion transmission system structure according to claim 1 is characterized in that: An input shaft spline retaining ring is provided on the input shaft.

4. The coaxial high-speed helicopter tail rotor propulsion transmission system structure according to claim 1 is characterized in that: A support plate is provided on the inner wall of the brake groove close to the axis of the input shaft. The support plate is located at the tail end of the clutch structure piston, and a return spring 1 is provided between the support plate and the clutch structure piston.

5. The coaxial high-speed helicopter tail rotor propulsion transmission system structure according to claim 1 is characterized in that: A spline retaining ring is provided behind the spline of the driven end.

Images