Power turbine shaft and turbine engine

Abstract

The present invention discloses a power turbine shaft and a turbine engine. The power turbine shaft comprises: a main shaft, a sleeve shaft, a limit assembly and a speed reducer. When the main shaft rotates at a specified speed, the main shaft and the sleeve shaft rotate at the same speed and remain relatively still. At this time, the sleeve shaft is located at the first limit position, the first end tooth at the rear end of the sleeve shaft and the second end tooth of the speed reducer are in a separated state, and the main shaft drives the turbine to rotate normally. When the main shaft breaks, the main shaft speed changes suddenly, the sleeve shaft slides on the main shaft to the second limit position, the first end tooth and the second end tooth are meshed, and the speed reducer provides the sleeve shaft with an angular acceleration opposite to the main shaft rotation direction, so as to reduce the main shaft speed and prevent the turbine from spinning out of control. The power turbine shaft ensures that the turbine speed can be reduced more safely when the main shaft breaks, thereby reducing the degree of damage to the engine, ensuring flight safety while reducing maintenance costs.

Description

Technical Field

[0001] The present invention relates to the technical field of aviation engines, and in particular to a power turbine shaft and a turbine engine. Background Art

[0002] The power turbine shaft of an aircraft engine is slender and is prone to breakage under extreme conditions, which can cause the turbine to spin out of control and produce an uncontained turbine disk rupture accident. In the prior art, the power turbine shaft breakage accident is solved by breaking the turbine blades to prevent the turbine from spinning out of control.

[0003] During the turbine blade fracture process, the movement of high-energy fragments is highly random, and the impact point cannot be accurately determined, which seriously threatens the flight safety of the engine and aircraft. In addition, the broken blades will damage the casing, guide vanes and other parts along the way, and the unpredictable unbalanced vibration will damage the supporting components and increase the maintenance cost. Summary of the invention

[0004] Therefore, the technical problem to be solved by the present invention is to overcome the defect of poor safety in the prior art of preventing the turbine from spinning out of control by breaking blades when solving the problem of power turbine shaft breakage, thereby providing a power turbine shaft and turbine engine that can more safely reduce the turbine speed when the power turbine shaft breaks.

[0005] In order to solve the above technical problems, the technical solution of the present invention is as follows:

[0006] A power turbine shaft comprises: a main shaft, a sleeve shaft, a limit assembly and a reduction device; the sleeve shaft is slidably sleeved on the main shaft, and the rear end of the sleeve shaft is provided with a first end tooth; the limit assembly is provided on the main shaft, and the limit assembly is suitable for limiting the sliding of the sleeve shaft between a first limit point and a second limit point; the reduction device is fixedly mounted on the stator casing, and the reduction device is provided with a second end tooth that can mesh with the first end tooth, and the first end tooth and the second end tooth have a separated state at the first limit point and a meshed state at the second limit point. In the meshed state, the reduction device provides the sleeve shaft with an angular acceleration opposite to the rotation direction of the main shaft to reduce the main shaft rotation speed.

[0007] According to some embodiments of the present invention, the limit assembly includes a fixed limit member, a limit groove is provided on the sleeve shaft, the length direction of the limit groove is inclined to the axial direction of the sleeve shaft, the fixed limit member is inserted into the limit groove and is fixedly connected to the main shaft, and the fixed limit member moves relative to the first limit point and the second limit point.

[0008] According to some embodiments of the present invention, the fixed limiting member is a pin, and a plurality of the fixed limiting members and the limiting grooves are provided, and the number of the fixed limiting members is equal to the number of the limiting grooves.

[0009] According to some embodiments of the present invention, the limit assembly also includes an elastic limit member, and a limit boss is provided at the front end of the main shaft near the sleeve shaft. When the sleeve shaft is located at the first limit point, one end of the elastic limit member abuts against the limit boss, and the other end of the elastic limit member can abut against the front end of the sleeve shaft.

[0010] According to some embodiments of the present invention, the elastic limiting member is an anti-rotation spring.

[0011] According to some embodiments of the present invention, the reduction device includes a transmission shaft and a load assembly, the transmission shaft is movably sleeved on the main shaft, the load assembly is mounted on the transmission shaft, and the second end tooth is disposed at the front end of the transmission shaft. In the meshing state, the main shaft transmits the torque to the load assembly through the sleeve shaft and the transmission shaft to reduce the main shaft speed.

[0012] According to some embodiments of the present invention, the load assembly includes: a box body, a plurality of dynamic friction plates, a plurality of static friction plates and a clamping structure; the box body is sleeved on the transmission shaft, and the box body is connected to the stator casing; a plurality of dynamic friction plates, the dynamic friction plates are fixedly sleeved on the transmission shaft and rotate with the transmission shaft; a plurality of static friction plates and a plurality of dynamic friction plates are alternately arranged in the axial direction of the transmission shaft, and the outer peripheries of the plurality of static friction plates are fixedly mounted on the box body; a clamping structure, the clamping structure is sleeved on the transmission shaft, and is suitable for pressing the plurality of dynamic friction plates and the plurality of static friction plates into a tight fit.

[0013] According to some embodiments of the present invention, the clamping structure includes a pressure plate and a locking nut which are sequentially sleeved on the transmission shaft, the pressure plate is suitable for pressing and fitting a plurality of the dynamic friction plates and a plurality of the static friction plates, and the locking nut is suitable for fixing the pressure plate on the transmission shaft.

[0014] According to some embodiments of the present invention, the dynamic friction plate, the static friction plate and the pressure plate are all made of carbon ceramic material.

[0015] The present invention also proposes a turbine engine, comprising the above-mentioned power turbine shaft and a turbine disk mounted on the power turbine shaft.

[0016] The technical solution of the present invention has the following advantages:

[0017] 1. The power turbine shaft provided by the present invention has a limit assembly on the main shaft. Under the action of the limit assembly, the sleeve shaft slides between the first limit point and the second limit point. When the main shaft rotates at a specified speed, the main shaft and the sleeve shaft rotate at the same speed and remain relatively still. At this time, the sleeve shaft is located at the first limit point, and the first end tooth at the rear end of the sleeve shaft and the second end tooth of the reduction device are in a separated state, and the main shaft drives the turbine to rotate normally; when the main shaft breaks, the main shaft speed changes suddenly, and the sleeve shaft and the main shaft rotate differentially at this time. The sleeve shaft slides on the main shaft to the second limit point, and the first end tooth and the second end tooth are meshed. The reduction device provides the sleeve shaft with an angular acceleration opposite to the rotation direction of the main shaft to reduce the main shaft speed and prevent the turbine from spinning out of control. The power turbine shaft ensures that the turbine speed can be reduced more safely when the main shaft breaks, thereby reducing the degree of damage to the engine, ensuring flight safety while reducing maintenance costs.

[0018] 2. The power turbine shaft provided by the present invention, when the main shaft is broken, the sleeve shaft produces axial displacement and meshes with the transmission shaft for transmission, thereby transmitting the torque of the main shaft to the load component. The transmission shaft drives the dynamic friction plate of the load component to rotate, and rubs against the static friction plate, thereby providing the sleeve shaft with angular acceleration in the opposite direction of rotation of the main shaft, reducing the main shaft speed to avoid turbine runaway.

[0019] 3. The turbine engine provided by the present invention can safely and effectively prevent the turbine from spinning out of control by installing the turbine on the above-mentioned power turbine shaft, thereby improving the flight safety of the aircraft. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the specific implementation methods of the present invention or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0021] Figure 1 A schematic diagram of the structure of a power turbine shaft provided in some embodiments of the present invention;

[0022] Figure 2 It is a cross-sectional view of a power turbine shaft provided in some embodiments of the present invention.

[0023] Explanation of the reference numerals in the accompanying drawings: 1. main shaft; 2. sleeve shaft; 3. reduction device; 4. fixed limit member; elastic limit member; 11. limit boss; 21. limit groove; 22. first end tooth; 31. transmission shaft; 311. second end tooth; 32. load assembly; 321. box body; 322. dynamic friction plate; 323. static friction plate; 324. pressure plate; 325. locking nut. DETAILED DESCRIPTION

[0024] The technical solution of the present invention will be described clearly and completely below 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 creative work are within the scope of protection of the present invention.

[0025] In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0026] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0027] In addition, the technical features involved in the different embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0028] When the power turbine shaft of an aircraft engine breaks, the turbine blades are often broken or the main fuel is cut off to reduce the turbine shaft speed and prevent the turbine from spinning out of control. However, breaking the turbine blades poses a major safety hazard, while cutting off the main fuel supply has a delay and cannot effectively reduce the risk of turbine spinning out of control in a short period of time.

[0029] Reference Figure 1 and Figure 2As shown, the present invention proposes a power turbine shaft, comprising: a main shaft 1, a sleeve shaft 2, a limit assembly and a reduction device 3; the sleeve shaft 2 is slidably sleeved on the main shaft 1, and the rear end of the sleeve shaft 2 is provided with a first end tooth 22; the limit assembly is arranged on the main shaft 1, and the limit assembly is suitable for limiting the sliding of the sleeve shaft 2 between a first limit point and a second limit point; the reduction device 3 is fixedly installed on the stator casing, and the reduction device 3 is provided with a second end tooth 311 that can mesh with the first end tooth 22, the first end tooth 22 and the second end tooth 311 have a separated state at the first limit point, and a meshed state at the second limit point. In the meshed state, the reduction device 3 provides the sleeve shaft 2 with an angular acceleration opposite to the rotation direction of the main shaft 1 to reduce the rotation speed of the main shaft 1.

[0030] Specifically, when the main shaft 1 rotates at a specified speed, the sleeve shaft 2 sleeved on the main shaft 1 rotates with the main shaft 1 at the same speed under the action of the limit assembly. At this time, the sleeve shaft 2 and the main shaft 1 are relatively stationary at the position of the first limit point, and the first end tooth 22 set at the rear end of the sleeve shaft 2 and the second end tooth 311 set at the front end of the reduction device 3 are in a separated state. The reduction device 3 is fixed on the stator casing, and the reduction device 3 is separated from the main shaft 1; when the main shaft 1 breaks, the speed of the main shaft 1 suddenly changes, and a speed difference is formed between the sleeve shaft 2 and the main shaft 1. Under the action of inertia, the sleeve shaft 2 moves along the main shaft 1. The shaft 1 slides in the axial direction, and the sleeve shaft 2 slides from the first limit point to the second limit point. At this time, the first end tooth 22 and the second end tooth 311 are meshed and connected. Under the action of the limit assembly, the sleeve shaft 2 and the main shaft 1 are relatively stationary and rotate at the same speed as the main shaft 1. After the first end tooth 22 and the second end tooth 311 are meshed with each other, the sleeve shaft 2 transmits the torque of the main shaft 1 to the reduction device 3. The reduction device 3 is connected to the main shaft 1 through the sleeve shaft 2. The reduction device 3 provides the sleeve shaft 2 with an acceleration in the opposite direction to the main shaft 1, thereby reducing the rotation speed of the main shaft 1, thereby avoiding the turbine loaded on the main shaft 1 from spinning.

[0031] The power turbine shaft reduces the torque of the main shaft 1 by means of energy transfer to reduce the rotation speed of the main shaft 1 and limit the rapid increase of the rotation speed of the main shaft 1, thereby achieving the purpose of preventing the turbine from spinning out of control. The power turbine shaft does not need to destroy the original mechanical structure. While reducing the rotation speed, it avoids damage to parts and components to ensure the safe flight of the aircraft. In addition, the main shaft 1, the sleeve shaft 2 and the reduction device 3 are closely connected. When the rotation speed suddenly changes, a speed difference is formed between the sleeve shaft 2 and the reduction device 3, and the sleeve shaft 2 will quickly move and connect with the speed component, thereby reducing the rotation speed of the main shaft 1. The response speed is fast, and the increase of the rotation speed of the main shaft 1 can be effectively limited, thereby reducing the risk of turbine spinning out of control.

[0032] Reference Figure 1In some embodiments of the present invention, the limit assembly includes a fixed limit member 4, a limit groove 21 is provided on the sleeve shaft 2, the length direction of the limit groove 21 is inclined to the axial direction of the sleeve shaft 2, the fixed limit member 4 is inserted into the limit groove 21 and is fixedly connected to the main shaft 1, and the sleeve shaft 2 slides between the first limit point and the second limit point so that the fixed limit member 4 moves relatively in the limit groove 21.

[0033] Specifically, when the main shaft 1 is broken, there is a speed difference between the main shaft 1 and the sleeve shaft 2. At this time, the sleeve shaft 2 slides toward the rear end relative to the main shaft 1. The limit groove 21 is provided on the side wall of the sleeve shaft 2. The length direction of the limit groove 21 is inclined to the axial direction of the sleeve shaft 2. The fixed limit member 4 is inserted into the limit groove 21 and fixedly connected to the main shaft 1. During the rotation of the sleeve shaft 2, the limit fixing member moves relatively in the limit groove 21. It can be understood that the two end points of the limit groove 21 in the length direction are respectively the first limit point and the second limit point. The first limit point is one end point of the limit groove 21 close to the speed reducer 3, and the second limit point is the other end point of the limit groove 21 away from the speed reducer 3. The function of the fixed limit member 4 is to make the sleeve shaft 2 slide between the first limit point and the second limit point, so as to avoid the excessive speed difference between the sleeve shaft 2 and the main shaft 1, resulting in excessive slippage of the sleeve shaft 2, which affects the transmission of torque.

[0034] In some embodiments of the present invention, the fixed limiting member 4 is a pin, and there are multiple fixed limiting members 4 and multiple limiting slots 21 , and the number of the fixed limiting members 4 is equal to the number of the limiting slots 21 .

[0035] Specifically, multiple fixed limit members 4 and limit grooves 21 are provided to limit the slippage of the sleeve shaft 2 on the main shaft 1, ensure reliability, and avoid structural damage caused by failure of a single fixed limit member 4, which affects torque transmission. The limit grooves 21 are evenly arranged along the circumference of the sleeve shaft 2, and the length directions of each limit groove 21 are parallel to each other. The number of limit grooves 21 is not a limitation of the present invention.

[0036] In some embodiments of the present invention, the limit assembly also includes an elastic limit member, and a limit boss 11 is provided at the front end of the main shaft 1 near the sleeve shaft 2. When the sleeve shaft 2 is located at the first limit point, one end of the elastic limit member abuts against the limit boss 11, and the other end of the elastic limit member can abut against the front end of the sleeve shaft 2.

[0037] In some embodiments of the present invention, the elastic limiting member is an anti-rotation spring.

[0038] Specifically, when the sleeve shaft 2 is located at the first limit position, the limit elastic member is in a free state, one end of the elastic limit member abuts against the limit boss 11, and the other end of the elastic limit member can abut against the front end of the sleeve shaft 2, so that when the main shaft 1 is decelerated, the sleeve shaft 2 will not slip significantly, avoiding rigid collision between the fixed limit member 4 and the limit groove 21. The elastic coefficient of the limit elastic member is not a limitation of the present invention.

[0039] In some embodiments of the present invention, the reduction device 3 includes a transmission shaft 31 and a load assembly 32. The transmission shaft 31 is movably sleeved on the main shaft 1, and the load assembly 32 is installed on the transmission shaft 31. The second end tooth 311 is arranged at the front end of the transmission shaft 31. In the meshing state, the main shaft 1 transmits the torque to the load assembly 32 through the sleeve shaft 2 and the transmission shaft 31 to reduce the rotation speed of the main shaft 1.

[0040] Specifically, the transmission shaft 31 is a spline shaft, and the second end tooth 311 arranged at the front end of the transmission shaft 31 is suitable for meshing and connecting with the first end tooth 22 of the sleeve shaft 2. When the main shaft 1 breaks, the sleeve shaft 2 slides along the axis, and the fixed limit member 4 moves to the second limit point. At this time, the first end tooth 22 and the second end tooth 311 are meshed, and the sleeve shaft 2 is relatively stationary with the main shaft 1 under the action of the fixed limit member 4. After the sleeve shaft 2 is connected to the transmission shaft 31, the torque of the main shaft 1 is transmitted to the transmission shaft 31, and then the transmission shaft 31 transmits the torque to the load component 32, thereby reducing the rotation speed of the main shaft 1.

[0041] In some embodiments of the present invention, the load assembly 32 includes: a box body 321, a plurality of dynamic friction plates 322, a plurality of static friction plates 323 and a clamping structure; the box body 321 is sleeved on the transmission shaft 31, and the box body 321 is connected to the stator casing; a plurality of dynamic friction plates 322, the dynamic friction plates 322 are fixedly sleeved on the transmission shaft 31 and rotate with the transmission shaft 31; the plurality of static friction plates 323 and the plurality of dynamic friction plates 322 are alternately arranged in the axial direction of the transmission shaft 31, and the outer peripheries of the plurality of static friction plates 323 are fixedly mounted on the box body 321; a clamping structure, the clamping structure is sleeved on the transmission shaft 31, and is suitable for pressing the plurality of dynamic friction plates 322 and the plurality of static friction plates 323 into a tight fit.

[0042] In some embodiments of the present invention, the clamping structure includes a pressure plate 324 and a locking nut 325 which are sequentially sleeved on the transmission shaft 31, the pressure plate 324 is suitable for pressing and fitting a plurality of dynamic friction plates 322 and a plurality of static friction plates 323, and the locking nut 325 is suitable for fixing the pressure plate 324 on the transmission shaft 31.

[0043] Specifically, the outer part of the box body 321 is fixedly connected to the stator casing and movably sleeved on the transmission shaft 31. A dynamic friction plate 322 and a static friction plate 323 are provided in the box body 321. Multiple dynamic friction plates 322 and multiple static friction plates 323 are alternately arranged and sleeved on the transmission shaft 31. The dynamic friction plate 322 cooperates with the keyway of the transmission shaft 31 and rotates with the transmission shaft 31. The outer periphery of the static friction plate 323 is fixedly connected to the box body 321. The clamping structure is sleeved and fixed on the transmission shaft 31. The clamping structure presses the multiple dynamic friction plates 322 and the multiple static friction plates 323 together, so that when the transmission shaft 31 is meshed with the sleeve shaft 2 to connect the transmission shaft 31, the dynamic friction plate 322 is driven to transmit, and the dynamic friction plate 322 and the static friction rotate relative to generate friction, and the kinetic energy of the transmission shaft 31 is mutually transmitted, thereby providing acceleration in the opposite direction of the sleeve shaft 2 and the main shaft 1, thereby reducing the rotation speed of the main shaft 1.

[0044] It can be understood that the clamping structure includes a pressure plate 324 and a locking nut. The locking nut is suitable for fixing the pressure plate 324 on the transmission shaft 31. The function of the pressure plate 324 is to press the dynamic friction plate 322 and the static friction plate 323 into a tight fit on the one hand to prevent the dynamic friction plate 322 and the static friction plate 323 from flying out during rotation; on the other hand, the relative rotation between the pressure plate 324 and the static friction plate 323 generates friction, further reducing the rotation speed.

[0045] In some embodiments of the present invention, the dynamic friction plate 322, the static friction plate 323 and the pressure plate 324 are all made of carbon ceramic material.

[0046] Specifically, since a large amount of heat is generated during the friction process, carbon ceramic material has the characteristics of high temperature resistance, small thermal expansion coefficient, light specific gravity, high strength and high hardness, etc., which can avoid the problem of fracture between the dynamic friction plate 322 and the static friction plate 323 caused by frictional heat.

[0047] The present invention also proposes a turbine engine, comprising the above-mentioned power turbine shaft and a turbine disk mounted on the power turbine shaft.

[0048] The turbine engine provided by the present invention can safely and effectively avoid turbine runaway by installing the turbine disk on the above-mentioned power turbine shaft, thereby improving the flight safety of the aircraft.

[0049] Obviously, the above embodiments are merely examples for the purpose of clear explanation, and are not intended to limit the implementation methods. For those skilled in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all the implementation methods here. The obvious changes or modifications derived therefrom are still within the scope of protection of the invention.

Claims

1. A power turbine shaft, characterized in that: include: Spindle (1); A sleeve shaft (2) is slidably sleeved on the main shaft (1), and a first end tooth (22) is provided at the rear end of the sleeve shaft (2); A limit assembly, arranged on the main shaft (1), the limit assembly being suitable for limiting the sliding movement of the sleeve shaft (2) between a first limit point and a second limit point; A reduction gear (3) fixedly mounted on the stator casing, the reduction gear (3) being provided with a second end tooth (311) capable of meshing with the first end tooth (22), the first end tooth (22) and the second end tooth (311) having a separation state when at the first limit point, and a meshing state when at the second limit point, wherein the reduction gear (3) provides the sleeve shaft (2) with an angular acceleration opposite to the rotation direction of the main shaft (1), so as to reduce the rotation speed of the main shaft (1); The limiting assembly comprises a fixed limiting member (4), a limiting groove (21) is provided on the sleeve shaft (2), the length direction of the limiting groove (21) is inclined with respect to the axial direction of the sleeve shaft (2), the fixed limiting member (4) is inserted into the limiting groove (21) and is fixedly connected to the main shaft (1), and the fixed limiting member (4) moves relatively between the first limiting point and the second limiting point.

2. The power turbine shaft according to claim 1, characterized in that: The fixed limiting member (4) is a pin, and a plurality of the fixed limiting members (4) and the limiting grooves (21) are provided, and the number of the fixed limiting members (4) is equal to the number of the limiting grooves (21).

3. The power turbine shaft according to claim 1, characterized in that: The limiting assembly also includes an elastic limiting member, and a limiting boss (11) is provided on the main shaft (1) near the front end of the sleeve shaft (2). When the sleeve shaft (2) is located at the first limiting point, one end of the elastic limiting member abuts against the limiting boss (11), and the other end of the elastic limiting member can abut against the front end of the sleeve shaft (2).

4. The power turbine shaft according to claim 3, characterized in that: The elastic limiting component is an anti-rotation spring.

5. The power turbine shaft according to any one of claims 1 to 4, characterized in that: The reduction device (3) comprises a transmission shaft (31) and a load component (32); the transmission shaft (31) is movably sleeved on the main shaft (1); the load component (32) is mounted on the transmission shaft (31); the second end tooth (311) is arranged at the front end of the transmission shaft (31); in the meshing state, the main shaft (1) transmits torque to the load component (32) through the sleeve shaft (2) and the transmission shaft (31), so as to reduce the rotation speed of the main shaft (1).

6. The power turbine shaft according to claim 5, characterized in that The load assembly (32) comprises: A box body (321) is sleeved on the transmission shaft (31), and the box body (321) is connected to the stator casing; A plurality of dynamic friction plates (322), wherein the dynamic friction plates (322) are fixedly sleeved on the transmission shaft (31) and rotate along with the transmission shaft (31); A plurality of static friction plates (323) are alternately arranged with the plurality of dynamic friction plates (322) in the axial direction of the transmission shaft (31), and the outer peripheries of the plurality of static friction plates (323) are fixedly mounted on the box body (321); A clamping structure is sleeved on the transmission shaft (31) and is suitable for clamping and fitting a plurality of the dynamic friction plates (322) and a plurality of the static friction plates (323).

7. The power turbine shaft according to claim 6, characterized in that The clamping structure comprises a pressure plate (324) and a locking nut (325) which are sequentially sleeved on the transmission shaft (31); the pressure plate (324) is suitable for pressing and fitting a plurality of dynamic friction plates (322) and a plurality of static friction plates (323); and the locking nut (325) is suitable for fixing the pressure plate (324) on the transmission shaft (31).

8. The power turbine shaft according to claim 7, characterized in that: The dynamic friction plate (322), the static friction plate (323) and the pressure plate (324) are all made of carbon ceramic material.

9. A turbine engine, characterized in that: It comprises the power turbine shaft according to any one of claims 1 to 8, and a turbine disk mounted on the power turbine shaft.

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