Radial transmission rod supporting assembly and engine radial transmission rod

Abstract

The invention discloses a transmission rod supporting assembly which comprises a transmission rod, a supporting seat and a supporting bearing, the supporting bearing is arranged between the supporting seat and the transmission rod, and the transmission rod supporting assembly further comprises a metal sponge damping ring arranged between the outer ring of the supporting bearing and the supporting seat. The transmission rod supporting assembly has better vibration reduction performance and a more stable structure. The invention further discloses an engine radial transmission rod.

Description

Technical Field

[0001] The present invention relates to the field of aero-engine transmission systems, and in particular to the field of transmission rods. Background Art

[0002] As the engine speed increases and the bypass ratio increases, the requirements for engine reliability also increase, and the design requirements for key components of aircraft engines also become more stringent.

[0003] The radial transmission rod is a key component of aircraft engines, used to transfer kinetic energy from the central transmission gearbox to the transfer gearbox. Generally, both ends of the radial transmission rod are connected to the gearbox through floating splines, and have a large aspect ratio. To ensure its working stability and life, it is necessary to avoid resonance and reduce vibration response within the working speed range. At present, the critical speed is usually increased by adding a support bearing in the middle position, but from the perspective of lightweight transmission system, the load-bearing capacity of the support bearing is generally limited.

[0004] In actual work, due to the influence of factors such as processing, installation, and engine vibration, the radial transmission rod will vibrate and deform during operation, which requires the support bearing to bear the additional vibration load in addition to the normal working load. When the load exceeds the bearing capacity of the support bearing, it will cause the bearing to fail, affecting the reliability and life of the radial transmission rod, and further affecting the smoothness and reliability of the transmission system operation; in order to ensure the lubrication of the bearing, oil return grooves are generally provided at the matching position between the support seat and the outer ring of the bearing and on the inner circumferential surface of the support seat, but this will cause discontinuity in the circumferential support of the support seat to the outer ring of the bearing, thereby affecting the bearing capacity and running stability of the bearing. Summary of the invention

[0005] An object of the present invention is to provide a radial transmission rod support assembly having better vibration reduction performance and a more stable structure.

[0006] To achieve the above purpose, the transmission rod support assembly includes a transmission rod, a support seat and a support bearing, wherein the support bearing is arranged between the support seat and the transmission rod, and also includes a metal sponge damping ring arranged between the outer ring of the support bearing and the support seat.

[0007] In one or more embodiments, the support seat includes a radial baffle extending from the inner side in the circumferential direction, and the metal sponge damping ring is fixedly connected to the radial baffle via a connecting piece.

[0008] In one or more embodiments, the outer ring of the support bearing is provided with an axially extending boss, and the radial baffle is provided with an anti-rotation groove that cooperates with the axially extending boss.

[0009] In one or more embodiments, the transmission rod support assembly also includes a first self-locking nut and a locking baffle arranged on the opposite side of the radial baffle, the first self-locking nut is used to apply an axial locking force, and the locking baffle is arranged between the outer ring of the support bearing and the first self-locking nut, and is fixedly connected to the metal sponge damping ring and the radial baffle through the connecting member.

[0010] In one or more embodiments, an oil return hole is also provided on the locking baffle.

[0011] In one or more embodiments, the transmission rod support assembly also includes a second self-locking nut and an oil retaining ring, which are arranged on one side of the radial baffle, the second self-locking nut is used to apply an axial locking force, and the oil retaining ring is arranged between the second self-locking nut and the inner ring of the support bearing.

[0012] In one or more embodiments, the metal sponge damping ring is interference fit with the circumferential inner side of the support seat.

[0013] In one or more embodiments, metal sponge damping rings with different geometric parameters may be interchangeably disposed between the outer ring of the support bearing and the support seat.

[0014] In one or more embodiments, the geometric parameters include the number and size of holes in the metal sponge.

[0015] Another object of the present invention is to provide an engine radial transmission rod, comprising an inner transmission rod, an outer transmission rod and the transmission rod support assembly.

[0016] The transmission rod support assembly is provided with a metal sponge damping ring between the outer ring of the bearing and the bearing seat, and utilizes the porous characteristics of the metal sponge itself to realize the passage of lubricating oil. At the same time, the metal sponge damping ring can also deform under the action of load, thereby consuming vibration energy, reducing the transmission of vibration energy, and achieving a vibration isolation effect. In addition, by changing the geometric parameters of the metal sponge damping ring, such as the number and size of holes in the metal sponge, its damping and stiffness characteristics can be adjusted, thereby adjusting the support stiffness and damping parameters of the radial transmission rod, and adjusting the critical speed, vibration mode and other dynamic characteristics of the radial transmission rod, which has multiple uses. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The above and other features, properties and advantages of the present invention will become more apparent through the following description in conjunction with the accompanying drawings and embodiments, in which:

[0018] Figure 1 It is a schematic diagram of the overall structure of the radial transmission rod;

[0019] Figure 2 It is a structural schematic diagram of an existing radial transmission rod;

[0020] Figure 3 It is a structural schematic diagram of an existing support seat;

[0021] Figure 4 is a structural cross-sectional view of the transmission rod support assembly;

[0022] Figure 5 It is a schematic diagram of the connection structure of the metal sponge damping ring;

[0023] Figure 6 is a schematic diagram of an embodiment of an auxiliary support bearing;

[0024] Figure 7 is a schematic diagram of an embodiment of an auxiliary support base;

[0025] Figure 8 is a schematic diagram of the metal sponge damping structure;

[0026] Fig. 9 It is a schematic diagram of the oil return structure;

[0027] Fig.10 It is a schematic diagram of the oil return path. DETAILED DESCRIPTION

[0028] The present invention is further described below in conjunction with specific embodiments and drawings. More details are elaborated in the following description to facilitate a full understanding of the present invention. However, the present invention can obviously be implemented in a variety of other ways different from the description herein. Those skilled in the art can make similar generalizations and deductions based on actual application situations without violating the connotation of the present invention. Therefore, the protection scope of the present invention should not be limited by the content of this specific embodiment.

[0029] It should be noted that these and other subsequent drawings are only examples and are not drawn to scale, and should not be used to limit the actual scope of protection required by the present invention.

[0030] As a key component of an aircraft engine, the radial drive shaft is mainly used to transfer power between the high-pressure rotor and the transfer gearbox, transfer kinetic energy from the central drive gearbox to the transfer gearbox, drive the engine accessories to work, and also transfer the torque of the starter to drive the high-pressure rotor of the engine to start the engine. The rationality of the design of the radial drive shaft, the stability of its operation and its reliability will directly affect the normal operation of the aircraft engine.

[0031] like Figure 1As shown, it includes an inner transmission rod 1, an outer transmission rod 6, a support bearing 3, a support seat 4, an oil retaining ring 9, a second self-locking nut 2, a first self-locking nut 5 and other components. The inner transmission rod 1 and the outer transmission rod 6 are connected to each other through a spline, and the support bearing 3 is arranged between the support seat 4 and the transmission rod. Figure 1 and Figure 2 In the illustrated embodiment, the end of the outer transmission rod 6 extends into the interior of the inner transmission rod 1, and the support bearing 33 is arranged between the support seat 4 and the inner transmission rod 1 to play a supporting role.

[0032] The auxiliary support bearing 3 is a ball bearing, and the oil supply method is under-ring oil supply. In order to realize the return of lubricating oil, two oil return grooves 42 are designed at the bearing mounting surface position in the auxiliary support seat, such as Figures 2 to 3 As shown, the positions of the two oil return grooves 42 are symmetrical along the axial direction. During the operation of the radial transmission rod, the lubricating oil flows through the oil return grooves under the action of gravity to realize the return of the lubricating oil. However, the oil return grooves 42 are arranged on the bearing mounting surface of the support seat 4. Such a design will cause the bearing mounting surface to be discontinuous, and then the support for the support bearing 3 will be discontinuous, affecting the smooth operation of the radial transmission rod.

[0033] In addition, since the radial transmission rod will vibrate and deform during operation, the support bearing needs to bear additional vibration loads in addition to the normal working load, which will affect the working performance of the radial transmission rod in the long term.

[0034] Based on this, the transmission rod support assembly disclosed in the present invention includes a transmission rod, a support seat 4 and a support bearing 3. The structure of the support bearing 3 is as shown in FIG. Figure 6 It is understood that the outer ring 31, the inner ring 33 and the bearing rolling element 34 located between the outer ring 31 and the inner ring 33. A metal sponge damping ring 8 is arranged between the outer ring 31 of the support bearing 3 and the support seat 4. Figure 4 and Figure 5 shown.

[0035] Metal sponge is a new type of composite material with the characteristics of both structural materials and functional materials, which contains a large number of controllable holes (air) in a metal matrix as a composite phase. It has the advantages of light weight, high specific strength, high damping, good sound absorption, sound insulation, impact absorption, and good passing performance. The metal sponge damping ring 8 made of metal sponge can solve multiple problems at the same time by utilizing the inherent characteristics of the metal sponge: the porous characteristics of the metal sponge itself are utilized to achieve the passage of lubricating oil, so the setting of the traditional oil return groove 42 can be eliminated; the metal sponge damping ring can also deform under the action of load, thereby consuming vibration energy, reducing the transmission of vibration energy, and playing a vibration isolation effect; without increasing the weight and affecting the bearing capacity of the auxiliary bearing, by changing the geometric parameters of the metal sponge damping ring, such as the number and size of the holes in the metal sponge, its damping and stiffness characteristics can also be adjusted, thereby adjusting the support stiffness and damping parameters of the radial transmission rod.

[0036] To fix the metal sponge damping ring 8, in some embodiments, the support seat 4 includes a radial baffle 41 extending from the inner side of the circumference, and a first self-locking nut 5 and a locking baffle 7 arranged on the opposite side of the radial baffle 41 are used to fix the metal sponge damping ring 8 on the other side. Figure 4 The first self-locking nut 5 applies a leftward axial locking force, and the locking baffle 7 is arranged between the outer ring 31 of the support bearing 3 and the first self-locking nut 5, and is fixedly connected to the metal sponge damping ring 8 and the radial baffle 41 respectively through a connecting member 10 such as a pin. Figure 8 The metal sponge damping ring 8 shown is provided with a through hole 81 for the connecting member 10 to pass through. Thus, the radial baffle 41 on the left side of the metal sponge damping ring 8 and the locking baffle 7 on the right side cooperate to achieve axial positioning of the metal sponge damping device 8.

[0037] The first self-locking nut 5, the locking baffle 7, and the radial baffle 41 in the support seat 4 cooperate with the bearing outer ring 31 axially to limit the bearing outer ring 31 axially; the second self-locking nut 2 and the oil retaining ring 9 on the same side of the radial baffle 41 cooperate to limit the bearing inner ring 33 axially. The bearing inner ring 33 of the support bearing 3 is interference-fitted with the inner transmission rod 1, and the bearing inner ring 33 is radially limited and circumferentially limited to position the radial and circumferential directions of the bearing inner ring, so that the bearing inner ring and the transmission rod rotate together during operation.

[0038] In some embodiments, Figure 4 As shown, the metal sponge damping ring 8 can also be interference fit with the circumferential inner side of the support seat 4.

[0039] Further references Figure 7The radial baffle 41 shown in the figure is understood that the inner circumference 401 of the support seat 4 cancels the oil return groove 42, forming a circumferentially continuous circumferential surface. The radial baffle 41 is also provided with an anti-rotation groove, which cooperates with Figure 6 The axially extending boss 32 on the outer ring 31 of the support bearing 3 is shown as Fig. 9 As shown, the bearing outer ring 31 is restricted from circumferential rotation.

[0040] In addition, the locking baffle 7 that fixes the metal sponge damping ring 8 is evenly distributed with oil return holes 71. Since the porous structure of the metal sponge itself has permeability, the lubricating oil passes through the metal sponge damping ring 8 and the oil return holes 71 under the action of gravity to realize the return of the lubricating oil. Fig.10 As shown, under the action of gravity, the lubricating oil O flows into the metal sponge 8 and then is discharged from the oil drain hole 71, thereby realizing the lubricating oil return.

[0041] Compared with the solution of returning oil through the oil return groove in the design structure, the lubricating oil passing area at this time is the circular ring shape presented by the metal sponge damping ring 8, which has a larger passing area and higher oil return efficiency, while ensuring that the supporting surface of the supporting outer ring 31 is in a continuous state.

[0042] The support bearing 3 and the metal sponge damping ring 8 cooperate to support the inner transmission rod 1 and the outer transmission rod 6. During the operation of the transmission rod, the load is transferred from the inner transmission rod 1 and the outer transmission rod 6 to the metal sponge damping ring 8 and the support seat 4 through the support bearing 3, and then continues to be transferred outward through the mounting edge 45 of the support seat 4. The metal sponge damping ring 8 deforms under the load, consumes vibration energy, reduces the transmission of vibration energy, and plays a vibration isolation effect.

[0043] The metal sponge damping ring 8 with different geometric parameters can be replaceably arranged between the outer ring 31 of the support bearing 3 and the support seat 4. For example, the geometric parameters of the metal sponge, such as the number and size of the holes in the metal sponge, can be designed to adjust its damping and stiffness characteristics, thereby adjusting the support stiffness and damping parameters of the radial transmission rod, and adjusting the critical speed, vibration mode and other dynamic characteristics of the radial transmission rod.

[0044] Therefore, the radial transmission rod support assembly with the metal sponge damping ring 8 improves and optimizes the support structure in the middle of the transmission rod from the perspective of improving the operating stability of the transmission system.

[0045] Without changing the bearing model, increasing the structural weight, and ensuring the return of lubricating oil, the damping and stiffness parameters of the damper are adjusted by designing the number and size of the holes in the metal sponge, thereby realizing the design of the support stiffness of the transmission rod and adjusting the critical speed of the transmission rod; the metal sponge can introduce additional damping for the radial transmission rod, which can effectively reduce the transmission of structural vibration, improve the damping performance of the transmission rod structure, thereby achieving the purpose of vibration reduction and noise reduction, and also reduce the weight of the structure; the passability of the metal sponge is used to ensure that the bearing surface of the auxiliary bearing seat can continuously and simultaneously realize the return of lubricating oil.

[0046] Combined with the introduction of the above-mentioned radial transmission rod support assembly, it can also be understood that an engine radial transmission rod includes a hollow inner transmission rod, an outer transmission rod and the above-mentioned transmission rod support assembly, so that the radial transmission rod has better vibration reduction performance and oil return performance.

[0047] It should be noted that the above content uses words such as "first" and "second" to limit components, which is only for the convenience of distinguishing the corresponding components. If not otherwise stated, the above words have no special meaning and therefore cannot be understood as limiting the scope of protection of this application.

[0048] The present application uses specific words to describe the embodiments of the present application. For example, "one embodiment", "an embodiment", and / or "some embodiments" refer to a certain feature, structure or characteristic related to at least one embodiment of the present application. Therefore, it should be emphasized and noted that "one embodiment" or "an embodiment" or "an alternative embodiment" mentioned twice or multiple times in different positions in this specification does not necessarily refer to the same embodiment. In addition, some features, structures or characteristics in one or more embodiments of the present application can be appropriately combined.

[0049] Although the present invention is disclosed as above with preferred embodiments, it is not intended to limit the present invention. Any person skilled in the art may make possible changes and modifications without departing from the spirit and scope of the present invention. Therefore, any modification, equivalent change and modification made to the above embodiments according to the technical essence of the present invention without departing from the content of the technical solution of the present invention shall fall within the protection scope defined by the claims of the present invention.

Claims

1. A transmission rod support assembly, comprising a transmission rod, a support seat and a support bearing, wherein the support bearing is arranged between the support seat and the transmission rod, It is characterized in that Also includes: The metal sponge damping ring is arranged between the outer ring of the support bearing and the support seat.

2. The transmission rod support assembly according to claim 1, characterized in that: The support seat comprises a radial baffle extending from the inner side in the circumferential direction, and the metal sponge damping ring is fixedly connected to the radial baffle via a connecting piece.

3. The transmission rod support assembly according to claim 2, characterized in that: The outer ring of the support bearing is provided with an axially extending boss, and the radial baffle is provided with an anti-rotation groove that cooperates with the axially extending boss.

4. The transmission rod support assembly according to claim 2, characterized in that: The transmission rod support assembly also includes a first self-locking nut and a locking baffle arranged on the opposite side of the radial baffle, the first self-locking nut is used to apply an axial locking force, and the locking baffle is arranged between the outer ring of the support bearing and the first self-locking nut, and is fixedly connected to the metal sponge damping ring and the radial baffle through the connecting piece.

5. The transmission rod support assembly according to claim 4, characterized in that: The locking baffle is also provided with an oil return hole.

6. The transmission rod support assembly according to claim 4, characterized in that: The transmission rod support assembly also includes a second self-locking nut and an oil retaining ring, which are arranged on one side of the radial baffle. The second self-locking nut is used to apply an axial locking force, and the oil retaining ring is arranged between the second self-locking nut and the inner ring of the support bearing.

7. The transmission rod support assembly according to claim 1, characterized in that: The metal sponge damping ring is interference-fitted with the inner circumferential side of the support seat.

8. The transmission rod support assembly according to claim 1, characterized in that: Metal sponge damping rings with different geometric parameters can be replaceably arranged between the outer ring of the support bearing and the support seat.

9. The transmission rod support assembly according to claim 8, characterized in that: The geometric parameters include the number and size of the holes in the metal sponge.

10. The radial transmission rod of the engine is characterized in that: include: Inner transmission rod; Outer transmission rod; as well as A transmission rod support assembly as claimed in claims 1 to 9.

Images