CN118167483A - Gear drive flexible damping device and gear drive system - Google Patents

Abstract

The utility model provides a gear drive flexible damping device, including transmission frame, flexible support and attenuator, transmission frame is used for transmitting the moment of torsion, including front end and rear end, and the rear end includes first leaf spring and connection tang, includes a plurality of first empty slots of circumference distribution on the first leaf spring, and the front end includes the extension support for be connected with the gear assembly; the flexible support is arranged on the periphery of the torque transmission frame and comprises a second plate spring, a plurality of second empty slots are circumferentially distributed on the second plate spring, and the second plate spring is positioned on the periphery of the first plate spring and is fixedly connected with the torque transmission frame through a connecting spigot; the damper is arranged between the torque transmission frame and the flexible support; wherein the radial thickness of the first leaf spring and the second leaf spring varies along the axial direction. The gear driving flexible damping device can solve the problem of dislocation of meshing positions among gears and vibration response of a gear transmission system. A gear drive system is also provided.

Description

Gear drive flexible damping device and gear drive system

Technical Field

The invention relates to the field of aeroengines, in particular to the field of gear vibration control.

Background

The gear drive engine introduces a reduction gear box between the fan rotor and the low-pressure turbine rotor, so that the fan rotor and the low-pressure rotor can respectively work in the respective optimal rotating speed ranges, and the rotating speed of the low-pressure turbine rotor can be greatly improved while the fan rotor keeps the low rotating speed. The reduction of the rotating speed of the fan rotor can reduce the blade tip speed and blade root stress, so that the further increase of the bypass ratio is possible; the increase of the rotating speed of the low-pressure turbine rotor can improve the working efficiency of the turbine, and the number of stages and the number of blades of the turbine are greatly reduced under the condition of the same thrust and power level.

During operation of the engine, vibrations generated by the gear drive system are transferred to the stator structure, which in addition transfers vibrations to the gear system. The gear driving system often has the problems of engagement dislocation and overlarge vibration amplitude. If the gear drive is in meshing dislocation, vibration is caused, noise is increased, so that tooth surface abrasion is increased, and the service life of the gear is reduced; if the amplitude of the vibration response is too large, the fatigue life of the gear is reduced, and even the normal torque transmission function is affected, so that the gear system is damaged.

In view of this, there is a need to propose a gear driven flexible damping device to solve the above-mentioned problems.

Disclosure of Invention

An object of the present invention is to provide a gear-driven flexible damping device capable of solving the problems of gear engagement misalignment and vibration response.

The gear-driven flexible damping device for achieving the purpose comprises a torque transmission frame, a flexible support and a damper, wherein the torque transmission frame is used for transmitting torque and comprises a front end and a rear end, the rear end comprises a first plate spring and a connecting spigot, the first plate spring comprises a plurality of first empty slots which are distributed circumferentially, and the front end comprises an extension bracket and is used for being connected with a gear assembly; the flexible support is arranged on the periphery of the torque transmission frame and comprises a second plate spring, the second plate spring comprises a plurality of second empty slots which are circumferentially distributed, and the second plate spring is positioned on the periphery of the first plate spring and is fixedly connected with the torque transmission frame through the connecting rabbet; a damper is disposed between the torque transmission frame and the flexible support; wherein the radial thickness of the first leaf spring and the second leaf spring varies along the axial direction.

In one or more embodiments, the radial thickness of the first leaf spring and the second leaf spring is relatively thick on both sides in the axial direction and relatively thin in the middle.

In one or more embodiments, the damper includes an elastic sealing ring and an annular groove provided on an outer circumferential surface of the torque transmission frame for accommodating the elastic sealing ring so that the torque transmission frame and the flexible support form a circumferential gap under the support of the elastic sealing ring.

In one or more embodiments, the damper further includes an oil passage hole provided on the flexible support to pass oil into the circumferential gap to form an oil film in the circumferential gap.

In one or more embodiments, the flexible support includes a connection end and a flexible end, the second leaf spring is disposed at the flexible end, and the connection end is configured to connect with an engine load bearing structure.

In one or more embodiments, the torque transmission frame further includes a circumferential stop plate, and the flexible support includes a circumferential clamping groove that mates with the circumferential stop plate.

In one or more embodiments, the first leaf spring is expanded.

Another object of the present invention is to provide a gear drive system comprising a star gear and further comprising a gear driven flexible damping device as described above.

The gear-driven flexible damping device adopts a flexible design on the torque transmission frame and the flexible supporting structure to form a flexible design of the torque transmission frame-flexible supporting series spring, and the flexible design can improve the parallelism between the gear rotating shaft and the central axis of the engine, so that the problem of dislocation at the meshing position between gears is solved, and the vibration response amplitude of the star gear transmission system can be reduced through the damping design. The radial thickness of the first plate spring and the radial thickness of the second plate spring are set to be changed along the axial direction, the thickness is small at the place with small stress and the thickness is large at the place with large stress on the basis of guaranteeing the torque function of the transmissible gear box, the purpose of prolonging the service life of parts is achieved by using the material with the greatest possibility, and meanwhile the structure is beneficial to weight reduction.

Drawings

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

FIG. 1 is a schematic structural view of an aircraft engine;

FIG. 2 is an assembled cross-sectional view of one embodiment of a gear driven flexible damping device;

FIG. 3 is an oblique view of one embodiment of a torque transmission frame;

fig. 4 is a partial enlarged view of the first leaf spring;

FIG. 5 is an oblique view of one embodiment of a flexible support;

Fig. 6 is a partial enlarged view of the second leaf spring;

FIG. 7 is a schematic structural view of an embodiment of a damper;

Fig. 8 is a schematic structural view of the elastic sealing ring.

Sign mark description

1. Sun gear

2. Planet wheel

3. Inner gear ring

4. Pin shaft

5. Planet carrier

6. Torque transmission frame

7. Flexible support

8. Damper

61. Front end

62. Middle end

63. Rear end

64. Circumferential limiting plate

65. First leaf spring

66. Connection spigot

67. First empty slot

68. Extension bracket

71. Connecting terminal

72. Flexible end

73. Second leaf spring

74. Second empty slot

75. Flange plate

81. Elastic sealing ring

82. Oil through hole

100. Fan rotor

110. Gear drive system

120. Low vortex shaft

130. Low pressure turbine rotor

140. High-pressure compressor rotor

150. High pressure turbine rotor

Detailed Description

The present invention will be further described with reference to specific embodiments and drawings, in which more details are set forth in the following description in order to provide a thorough understanding of the present invention, but it will be apparent that the present invention can be embodied in many other forms than described herein, and that those skilled in the art may make similar generalizations and deductions depending on the actual application without departing from the spirit of the present invention, and therefore should not be construed to limit the scope of the present invention in terms of the content of this specific embodiment.

It is noted that these and other figures are merely examples, which are not drawn to scale and should not be construed as limiting the scope of the invention as it is actually claimed.

The large bypass ratio gear driven turbofan engine is schematically illustrated in fig. 1, and its rotating parts may be divided into a high pressure rotor and a low pressure rotor, the low pressure rotor including a low pressure turbine rotor 130, a gear drive system 110 and a fan rotor 100. The high-speed low-pressure turbine shaft drives the fan rotor to rotate through gear reduction, so that the fan and the low-pressure turbine work at the optimal rotating speeds respectively, and the propulsion efficiency of the engine is improved.

The gear drive system in fig. 1 is a planetary gear train, which is distinguished by a fixed object, and is a layout in which the planet carrier is fixed, called a star gear drive system. Referring to fig. 1 and 2, the star gear drive system acts as a speed reducer such that the fan rotor 100 and the low pressure turbine rotor 130, the low pressure compressor rotor may operate within respective optimal rotational speed ranges, respectively. The star gear comprises a sun gear 1, a planet gear 2 and an inner gear ring, wherein the sun gear 1 is used as an input end and is connected with a low-pressure turbine shaft; the planetary gear 2 is meshed with the sun gear 1 and the inner gear ring, so that the functions of transmitting power and torque and decelerating are achieved. The planet wheels 2 are supported on a planet carrier 5 by means of pins 4.

The flexible damping device for the gear drive is applied to a gear drive system, flexible design is beneficial to uniform load of the gear system, the service life of gear teeth is prolonged, damping design is beneficial to vibration reduction of a star gear system, a buffering and vibration reduction function is realized, and vibration response amplitude among components is reduced.

Referring to fig. 2 to 6, the gear-driven flexible damping device includes a torque transmission frame 6, a flexible support 7, and a damper 8.

As shown in fig. 3 and 4, the torque transmission frame 6 is used for transmitting torque, and includes a front end 61 and a rear end 63, the rear end 63 includes a first leaf spring 65 and a connection spigot 66, and the first leaf spring 65 includes a plurality of first empty slots 67 distributed circumferentially. The front end 61 comprises an extension bracket 68 for connection with a gear assembly, the extension bracket 68 being connected with the planet carrier 5 in fig. 2. In the embodiment shown in fig. 3, the torque transmission frame 6 further comprises an annular middle end 62 connecting the front end 61 and the rear end 63.

As shown in fig. 5 and 6, the flexible support 7 is disposed on the outer periphery of the torque transmission frame 6, and includes a second plate spring 73, where the second plate spring 73 includes a plurality of second empty slots 74 distributed circumferentially, and the second plate spring 73 is located on the outer periphery of the first plate spring 65 and is fixedly connected with the torque transmission frame 7 through the connection spigot 66. If the torque transmission frame 6 and the flexible support 7 are flange-connected, the contact surface on the outer side in the axial direction of the connection spigot 66 is positioned as a spigot in connection.

The flexible support 7 comprises a connection end 71 and a flexible end 72, and a second leaf spring 73 is arranged on the flexible end 72, the connection end 71 comprising a flange 75, the flange 75 being connected to an engine load bearing structure external to the gear train. A flexible support structure connects the gear drive system and the stator structure allowing relative movement between the gear drive system and the stator structure.

The first recess 67 forms a plurality of axially elongated plates on the first leaf spring 65 and the second recess 74 breaks the second leaf spring 73 into a plurality of axially elongated plates so that both the first leaf spring 65 and the second leaf spring 73 form a flexible design.

In some embodiments, the first leaf spring 65 is also designed to be flared, enabling the connection spigot of the end to be positioned with the end of the flexible support as a radial spigot.

The flexible design of the gear driven flexible damping device comprises two parts: the first part is a flexible structure of the torque transmission frame, namely a first plate spring structure; the second part is the structure of the flexible support 7, namely the second leaf spring structure; both form a flexible design of the torsion frame-flexible support tandem spring. The flexible parts of the torque transmission frame and the flexible supporting structure are all annular structures. The torque transmission frame and the flexible supporting structure are flexibly designed, so that the parallelism between the gear rotating shaft and the central axis of the engine can be improved under the deformation of the whole engine, the dislocation between the meshing parts of gears and the gear bearing parts is reduced, the meshing efficiency is improved, and the service life of the gears is prolonged.

The radial thickness of the first and second leaf springs 65 and 73 varies along the axial direction P, and is preferably relatively thick at both sides in the axial direction and relatively thin at the middle. On the basis of ensuring the torque function of the transmissible gearbox, the thickness is small at the place with small stress, the thickness is large at the place with large stress, and the maximum possible utilization of materials is achieved, so that the purpose of prolonging the service life of the part is achieved, and meanwhile the weight reduction of the structure is facilitated.

Preferably, the stress distribution of the leaf spring is obtained by numerical calculation to conduct guidance. According to the guiding data, the radial thickness reaches the minimum at the midpoint of the axial length of the plate, thereby realizing weight reduction, rigidity reduction and better flexibility.

The damper 8 is disposed between the middle end 62 of the torque transmission frame 6 and the flexible support 7, and specifically includes an elastic sealing ring 81 and an annular groove disposed on the outer peripheral surface of the middle end 62 of the torque transmission frame 6 for accommodating the elastic sealing ring 81 so that the torque transmission frame 6 and the flexible support 7 form a circumferential gap c supported by the elastic sealing ring 81, as shown in fig. 7. The radial limiting function can be set by utilizing the clearance of the radial damper to protect the gear transmission system.

The damper further comprises an oil through hole 82, the oil through hole 82 is arranged on the flexible support 7 to enable oil to pass into the circumferential gap c, and then an oil film is formed in the circumferential gap, so that the extrusion oil film damper is formed, and vibration is effectively restrained by oil pressure. When fluid flows into the cavity from the hole on the flexible supporting structure, the fluid leaks out of the cavity at the annular groove, and the elastic sealing ring 81 with an opening is arranged in the annular groove, so that the outer round surface of the sealing ring is tightly attached to the inner surface of the flexible supporting structure under the action of the elastic force of the sealing ring, thereby realizing sealing.

In the limit of the fan blade loss, when the radial gap between the torque transmission frame and the flexible supporting structure is eaten, the flexible supporting 7 between the elastic sealing rings 81 and the torque transmission frame 6 are in face-to-face contact, and the contact surface of the part provides an additional radial force transmission path, so that the gear transmission system is protected.

The damper is arranged between the torque transmission frame and the flexible supporting structure, so that the vibration response of the star gear box can be reduced, the service life and reliability of the gear driving system are improved, and the maintenance frequency of the engine is reduced.

In some embodiments, the torque transmission frame 6 further includes a circumferential limiting plate 64, and the flexible support 7 includes a circumferential clamping groove (not shown in the figures) that cooperates with the circumferential limiting plate. In the initial assembly condition, the circumferential limit plate 64 and the circumferential clamping groove do not match each other; under the limit working condition, the circumferential limiting plate 64 is clamped with the circumferential clamping groove, so that a torque transmission path between the torque transmission frame and the flexible supporting structure can be increased, and the gear transmission system is protected.

Further, the plurality of circumferential limiting plates 64 are uniformly distributed along the circumferential surface of the torque transmission frame 6, and as shown in fig. 3, the five circumferential limiting plates 64 are sequentially distributed on the side wall of the middle end 62. By utilizing the circumferentially distributed limiting block structure, a circumferential limiting function is set for protecting a gear transmission system.

According to the gear driving flexible damping device, the flexible design, the damper device and the limiting design are adopted on the torque transmission frame and the flexible supporting structure, so that the service life and reliability of a gear driving system are effectively improved, and the maintenance frequency of an engine is reduced.

With the above description of the gear-driven flexible damping device, it can be further understood that a gear driving system includes a star gear and the gear-driven flexible damping device, so that the gear driving device has a better vibration response range, reduces engagement dislocation, and can also have a radial force transmission path under a limit state, thereby protecting the gear driving system.

It should be noted that, in the foregoing description, the terms "first", "second", etc. are used to define the components, and are merely for convenience in distinguishing the corresponding components, and unless otherwise stated, the terms have no special meaning, and are not meant to represent primary or secondary aspects, so that the scope of the present application is not to be construed as being limited.

Meanwhile, the present application uses specific words to describe embodiments of the present application. Reference to "one embodiment," "an embodiment," and/or "some embodiments" means that a particular feature, structure, or characteristic is associated with at least one embodiment of the application. Thus, it should be emphasized and should be appreciated that two or more references to "an embodiment" or "one embodiment" or "an alternative embodiment" in various positions in this specification are not necessarily referring to the same embodiment. Furthermore, certain features, structures, or characteristics of one or more embodiments of the application may be combined as suitable.

While the invention has been described in terms of preferred embodiments, it is not intended to be limiting, but rather to the invention, as will occur to those skilled in the art, without departing from the spirit and scope of the invention. Therefore, any modification, equivalent variation and modification of the above embodiments according to the technical substance of the present invention fall within the protection scope defined by the claims of the present invention.

Claims (8)

1. The gear drive flexible damping device, characterized by comprising:

A torque transmission frame (6) for transmitting torque, comprising a front end (61) and a rear end (62), wherein the rear end (62) comprises a first plate spring (65) and a connecting spigot (66), the first plate spring (65) comprises a plurality of first empty slots (67) distributed circumferentially, and the front end (61) comprises an extension bracket (68) for connecting with a gear assembly;

The flexible support (7) is arranged on the periphery of the torque transmission frame (6) and comprises a second plate spring (73), a plurality of second empty slots (74) are circumferentially distributed on the second plate spring (73), and the second plate spring (73) is positioned on the periphery of the first plate spring (65) and is fixedly connected with the torque transmission frame (6) through the connecting spigot (66); and

A damper (8) disposed between the torque transmission frame (6) and the flexible support (7);

wherein the radial thickness of the first leaf spring (65) and the second leaf spring (73) varies in the axial direction.

2. Gear driven flexible damping device according to claim 1, characterized in that the radial thickness of the first leaf spring (65) and the second leaf spring (73) is relatively thick on both axial sides and relatively thin in the middle.

3. Gear driven flexible damping device according to claim 1, characterized in that the damper (8) comprises an elastic sealing ring (81) and an annular groove provided on the outer circumferential surface of the torque transmission frame (6) for accommodating the elastic sealing ring (81) such that the torque transmission frame (6) and the flexible support (7) form a circumferential gap supported by the elastic sealing ring (81).

4. A gear driven flexible damping device according to claim 3, characterized in that the damper (8) further comprises oil through holes (82), which oil through holes (82) are provided on the flexible support (7) for oil to the circumferential gap and thus for an oil film in the circumferential gap.

5. Gear driven flexible damping device according to claim 1, characterized in that the flexible support (7) comprises a connecting end (71) and a flexible end (72), the second leaf spring (73) being arranged at the flexible end (72), the connecting end (71) being intended for connection with an engine load bearing structure.

6. The gear driven flexible damping device according to claim 1, wherein the torque transmission frame (6) further comprises a circumferential limiting plate (64), and the flexible support (7) comprises a circumferential clamping groove cooperating with the circumferential limiting plate (64).

7. Gear driven flexible damping device according to claim 1, characterized in that the first leaf spring (65) is in the form of an expansion.

8. A gear drive system comprising a star gear and further comprising a gear driven flexible damping device according to any one of claims 1 to 7.