Aero-engine transmission system and its transfer gear box

Abstract

The application aims to provide an aero-engine transmission system and a switching gear box thereof. The switching gear box comprises a first opening for mounting a first gear assembly, a second opening for mounting a second gear assembly, and an outer shell extending from the first opening to the second opening. The plane where the first opening is located is not parallel to the plane where the second opening is located, and the cross section of the outer shell is annular and extends along an arc between the first opening and the second opening. The switching gear box can facilitate the backflow of lubricating oil.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of gas turbine engine transmission system, in particular to an aero-engine transmission system and a gear box thereof. BACKGROUND

[0002] When the aero-engine transmission system gear shaft is running at high speed, a pair of spiral bevel gears in the gear box changes the transmission direction and transmission ratio, and the bevel gear pair generates a large amount of heat and air disturbance in the gear box. The gear oil in the box plays a role of lubrication and heat dissipation. Figure 1 and Figure 2 A schematic diagram of the existing gear box is shown, wherein the existing gear box includes an outer housing 91 and a driving wheel 92 and a driven wheel 93 arranged inside the outer housing. The driving wheel 92 and the driven wheel 93 are fixed in the outer housing 91 through a driving wheel bearing seat 94 and a driven wheel bearing seat 95 respectively.

[0003] However, as shown in the current gear box structure, Figures 1 to 2 the gear oil is prone to poor return, which in turn causes the wall temperature of the gear box to rise sharply, resulting in an alarm shutdown. SUMMARY

[0004] The purpose of the present application is to provide a gear box that can facilitate the return of gear oil.

[0005] To achieve the above-mentioned purpose, the gear box comprises:

[0006] a first opening for mounting a first gear assembly;

[0007] a second opening for mounting a second gear assembly; and

[0008] an outer housing extending from the first opening to the second opening,

[0009] wherein the plane where the first opening is located is not parallel to the plane where the second opening is located, and the cross section of the outer housing is annular, extending along an arc between the first opening and the second opening.

[0010] In one or more embodiments, the gear box further comprises a return oil cavity, which is arranged outside the outer housing and extends along an arc between the first opening and the second opening. The extension direction of the return oil cavity corresponds to the extension direction of the outer housing.

[0011] In one or more embodiments, the outer shell body is further provided with a plurality of reinforcing ribs, each of the reinforcing ribs extending along an arc between the first opening and the second opening, and the extending direction of each of the reinforcing ribs corresponds to the extending direction of the outer shell body.

[0012] The plurality of reinforcing ribs are arranged around the outer shell body and avoid the position of the oil return cavity.

[0013] In one or more embodiments, the outer shell body is provided with a first oil return opening and a second oil return opening, the first oil return opening is in communication with the inside of the outer shell body and the oil return cavity at a position close to the first opening, and the second oil return opening is in communication with the inside of the outer shell body and the oil return cavity at a position close to the second opening.

[0014] In one or more embodiments, the oil return cavity is further provided with an oil return channel, the oil return channel is in communication with the outside.

[0015] When the adapter gear box is in the assembled state, the oil return cavity is located at the lower part of the outer shell body, and the oil return channel extends downward from the oil return cavity.

[0016] In one or more embodiments, the inner diameter of the oil return channel gradually decreases from the oil return cavity to the free end, so that the oil return channel is funnel-shaped as a whole.

[0017] In one or more embodiments, the free end face of the oil return channel is provided with a flange hole.

[0018] In one or more embodiments, the outer shell body is further provided with a support plate, the support plate extends from the outer shell body towards the inside, and the extending direction of the support plate is parallel to the plane where the second opening is located.

[0019] When the second gear assembly is installed in the second opening, the support plate is located close to the second gear end face of the second gear assembly.

[0020] In one or more embodiments, the outer shell body is further provided with a third oil return opening, the third oil return opening is in communication with the inside of the outer shell body and the oil return cavity at a position close to the support plate.

[0021] On the other hand, according to some embodiments of the present application, an aero-engine transmission system is also provided, which comprises a driving gear set, a driven gear set, and an aero-engine transmission system as described above.

[0022] The first opening is used for installing the driving gear set, and the second opening is used for installing the driven gear set.

[0023] The beneficial effects of the present application are that:

[0024] In the present adapter gear box, by making the outer shell as a whole arc-shaped tubular, the inner wall surface of the outer shell extends along an arc between the first opening and the second opening, the box structure is changed from a traditional square box shape to an arc-shaped cylindrical shape, so that the inner wall of the outer shell is a smooth arc surface, which is more conducive to the backflow of lubricating oil, and can reduce the stress concentration of the local outer shell. The existing gear box structure reduces the situation that lubricating oil is prone to poor backflow.

[0025] The above description is only a summary of the technical solutions of the present application. In order to enable the technical means of the present application to be more clearly understood, and to be implemented in accordance with the content of the specification, and in order to enable the above and other purposes, features and advantages of the present application to be more apparent and easy to understand, the following specific embodiments of the present application are described. BRIEF DESCRIPTION OF DRAWINGS

[0026] By reading the detailed description of the preferred embodiments below, various other advantages and benefits will become apparent to those of ordinary skill in the art. The drawings are for the purpose of illustrating the preferred embodiments only and are not to be considered as limiting the present application. Moreover, the same reference numerals are used throughout the various drawings to designate the same or similar parts. In the drawings:

[0027] Figures 1 to 2 A schematic diagram of the existing gear box structure is shown;

[0028] Figure 3 A three-dimensional schematic diagram according to some embodiments of the present adapter gear box is shown;

[0029] Figure 4 A half-section schematic diagram according to some embodiments of the present adapter gear box is shown;

[0030] Figure 5 A half-section schematic diagram under actual working conditions according to some embodiments of the present adapter gear box is shown. DETAILED DESCRIPTION

[0031] The embodiments of the technical solutions of the present application will be described in detail below with reference to the drawings. The following embodiments are only used to more clearly illustrate the technical solutions of the present application, and therefore only serve as examples, and cannot limit the protection scope of the present application.

[0032] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which the present application belongs; the terms used herein are only for the purpose of describing specific embodiments and are not intended to limit the present application; the terms "include" and "have" and any variations thereof in the specification and claims of the present application and the above description of drawings are intended to cover non-exclusive inclusion.

[0033] To address the issue of poor oil return in existing gearbox structures, this application provides a transition gearbox housing based on some embodiments. Figure 3 A perspective view of some embodiments of this adapter gearbox is shown. Figure 4 A half-sectional schematic diagram according to some embodiments of this adapter gearbox is shown. Figure 5 A half-sectional schematic diagram of actual operating conditions is shown according to some embodiments of this adapter gearbox.

[0034] The adapter gearbox includes a first opening 1 for mounting a first gear assembly 101, a second opening 2 for mounting a second gear assembly 102, and a housing 3 extending from the first opening 1 to the second opening 2. It is understood that, in some other ways of describing it, the first opening 1 and the second opening 2 may also be regarded as being opened / formed at both ends of the housing 3.

[0035] Among them, such as Figure 5 As shown, the plane A containing the first opening 1 and the plane B containing the second opening 2 form an angle. As shown in the figure, the angle between plane A and plane B is approximately 90 degrees. However, in some other suitable embodiments, the angle can be any angle, as long as plane A and plane B are not parallel.

[0036] The outer casing 3 has a circular cross-section. The outer casing 3 extends along an arc between the first opening 1 and the second opening 2. It can be understood that the extension direction of the outer casing 3 can be considered as the extension direction of the line connecting the centers of multiple cross-sections of the outer casing. The arc extension of the outer casing 3 between the first opening 1 and the second opening 2 means that the line connecting the centers of multiple cross-sections of the outer casing is arc-shaped. It can be understood that, in a specific embodiment, the cross-section of the outer casing 3 at any position along the extension direction is a circular ring of the same size, and the thickness of the ring is the wall thickness of the outer casing 3.

[0037] With this configuration, the outer casing 3 is generally in the shape of an arc-shaped tube. The inner circumferential wall of the outer casing 3 extends along an arc between the first opening 1 and the second opening 2, changing the gearbox structure from a traditional square box shape to an arc-shaped cylinder. This makes the inner wall of the outer casing 3 a smooth arc surface, which is more conducive to the return of lubricating oil and reduces local stress concentration in the outer casing. This reduces the problem of poor lubricating oil return that is common in existing gearbox structures.

[0038] In the description of the embodiments of this application, the technical terms "first" and "second", such as "first opening" and "second opening", are used only to distinguish different objects and should not be construed as indicating or implying relative importance or implicitly indicating the number, specific order or primary and secondary relationship of the indicated technical features.

[0039] Reference to“an embodiment” herein means that a particular feature, structure, or characteristic described in connection with the embodiment can be included in at least one embodiment of the application. The appearances of the phrase“in

[0040] Reference is made to Figure 3 and Figure 4 In some embodiments of the adapter gearbox, the adapter gearbox further comprises an oil return cavity 4, the oil return cavity 4 is arranged outside the outer housing 3 and extends along an arc between the first opening 1 and the second opening 2, the extension direction of the oil return cavity 4 corresponds to the extension direction of the outer housing 3, it can be understood that the oil return cavity 4 and the outer housing 3 both extend along an arc, and the extension directions of the two correspond to each other, which means that the arc where the extension direction of the oil return cavity 4 is located and the arc where the extension direction of the outer housing 3 is located are arranged conformally to each other. In this way, the traditional structure of directly connecting the oil outlet in the engine case is abandoned, and a double-cavity structure is adopted in the present gearbox, that is, the oil return passage is a separate arc-shaped cavity, so that the oil return cavity 4 is arranged independently of the inside of the outer housing 3, which can avoid the interference of air vortex caused by the operation of the gear pair in the outer housing, and ensure the smoothness of oil return. At the same time, the oil return cavity 4 also adopts a wide arc-shaped cylinder, which can ensure the stable and effective oil return function in different flight attitudes, and further improve the reliability of the adapter gearbox.

[0041] Reference is made to Figure 3 and Figure 4 In some embodiments of the adapter gearbox, the outer housing 3 further comprises a plurality of reinforcing rib plates 30, each reinforcing rib plate 30 extends along an arc between the first opening 1 and the second opening 2, and the extension direction of each reinforcing rib plate 30 corresponds to the extension direction of the outer housing 3, wherein the plurality of reinforcing rib plates 30 are arranged in the circumferential direction around the outer housing 3, the arc where the extension direction of each reinforcing rib plate 30 is located and the arc where the extension direction of the outer housing 3 at the connection position is located are arranged conformally to each other, and the reinforcing rib plate 30 avoids the position of the oil return cavity. By arranging the reinforcing rib plate 30 on the outer periphery of the outer housing 3, the strength of the adapter gearbox is ensured, and the heat dissipation area of the engine case surface is improved at the same time.

[0042] Reference is made to Figure 4In some embodiments of this adapter gearbox, the outer shell 3 is provided with a first oil return port 31 and a second oil return port 32. The first oil return port 31 connects the interior of the outer shell 3 and the oil return chamber 4 near the first opening 1, and the second oil return port 32 connects the interior of the outer shell 3 and the oil return chamber 4 near the second opening 2. By providing two oil return ports, the gearbox can smoothly return oil in different flight attitudes (forward tilt, backward tilt, left tilt, right tilt) and avoid oil accumulation.

[0043] Please see Figure 3 In some embodiments of this transition gearbox, an oil return channel 40 is also provided in the oil return chamber 4, which connects the oil return chamber 4 to the outside. The transition gearbox is located in the assembled state (e.g., ...). Figure 3 When the oil return chamber 4 is located at the lower part of the outer shell 3 (as shown in the figure), the oil return channel 40 extends downward from the oil return chamber 4. By setting the oil return channel 40, the lubricating oil accumulated in the oil return chamber 4 can be discharged to avoid accumulation.

[0044] Further, please see Figure 3 In some embodiments of this adapter gearbox, the inner diameter of the oil return channel 40 gradually decreases from the oil return chamber 4 downwards, so that the oil return channel 40 is funnel-shaped as a whole. This structure can ensure a large cross-sectional area of ​​the oil return port and a low position of the oil return port.

[0045] Further, please see Figure 3 In some embodiments of this adapter gearbox, the free end face of the oil return channel 40 is provided with a flange hole for connection to an external device to discharge lubricating oil.

[0046] Please see Figure 4 as well as Figure 5 In some embodiments of this transition gearbox, a support plate 33 is also provided inside the outer shell 3. The support plate 33 extends from the outer shell 3 toward the interior, and the extending direction of the support plate 33 is parallel to the plane B where the second opening 2 is located. Figure 5 As shown, when the second gear assembly 102 is installed in the second opening 2, the support plate 33 is located near the end face of the second gear 1020 in the second gear assembly 102. By setting the support plate 33, the strength of the housing is enhanced, while the mutual influence of the eddies between the first gear assembly 101 and the second gear assembly 102 is reduced, the direction of the eddies is changed or the generation of eddies is disrupted, and the return oil is further facilitated.

[0047] In one specific embodiment, the support plate 33 is semi-circular to not completely enclose the outer shell 3.

[0048] Further, please see Figure 4In some embodiments of this transition gearbox, a third oil return port 34 is also provided in the outer shell 3. The third oil return port 34 connects the interior of the outer shell 3 with the oil return chamber 4 near the support plate 33. By setting the third oil return port 34, the first oil return port 31, the second oil return port 32, and the third oil return port 34 are arranged in an arc shape, which can effectively ensure that the transition gearbox can return oil smoothly in different flight attitudes (forward tilt, backward tilt, left tilt, right tilt) and avoid oil accumulation. At the same time, the oil passage is cast between the inner wall of the outer shell and the support plate 33, which can intermittently shorten the length of the nozzle inside the gearbox.

[0049] Based on the arc cross-section of the transition gearbox, surface heat dissipation fins, separate oil return chamber and internal support plate structure proposed in one or more of the foregoing embodiments, compared with the traditional gearbox structure, the gearbox wall thickness can be effectively reduced while ensuring equal strength, thereby achieving a weight reduction of 10% to 15%, while increasing the gearbox surface heat dissipation area by 15% to 20%.

[0050] On the other hand, according to some embodiments of this application, an aircraft engine transmission system is also provided, such as... Figure 5 As shown, it includes a driving gear set (first gear assembly 101), a driven gear set (second gear assembly 102), and a transition gearbox as described in the previous one or more embodiments. The driving gear set is mounted to the first opening 1 via, for example, a bearing housing, and the driven gear set is mounted to the second opening 2 via, for example, a bearing housing.

[0051] In the description of the embodiments of this application, "multiple" means two or more, unless otherwise explicitly specified.

[0052] In the description of the embodiments of this application, unless otherwise expressly specified and limited, technical terms such as "installation," "connection," "joining," and "fixing" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. For those skilled in the art, the specific meaning of the above terms in the embodiments of this application can be understood according to the specific circumstances.

[0053] It should be understood that the use of "along" in the text means that there is at least a component in that direction, preferably, the angle with that direction is within 10°, more preferably, the angle is within 5°.

[0054] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and not to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. These modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application, and they should all be covered within the scope of the claims and specification of this application. In particular, as long as there is no structural conflict, the various technical features mentioned in the embodiments can be combined in any way. This application is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. A transition gearbox housing, characterized in that, include: The first opening is for mounting the first gear assembly; The second opening is used to install the second gear assembly; as well as The outer casing extends from the first opening to the second opening. Wherein, the plane containing the first opening is not parallel to the plane containing the second opening, and the cross-section of the outer shell is annular, extending along an arc between the first opening and the second opening; The adapter gearbox also includes an oil return chamber, which is located on the outside of the outer casing and extends along an arc between the first opening and the second opening. The extension direction of the oil return chamber corresponds to the extension direction of the outer casing.

2. The adapter gearbox as described in claim 1, characterized in that, The outer periphery of the outer shell is also provided with a plurality of reinforcing ribs, each of the reinforcing ribs extending along an arc between the first opening and the second opening, and the extension direction of each reinforcing rib corresponds to the extension direction of the outer shell. The reinforcing ribs are arranged around the outer shell and avoid the location of the oil return cavity.

3. The adapter gearbox housing as described in claim 1, characterized in that, The outer casing has a first oil return port and a second oil return port. The first oil return port is located near the first opening and connects the interior of the outer casing with the oil return cavity. The second oil return port is located near the second opening and connects the interior of the outer casing with the oil return cavity.

4. The adapter gearbox housing as described in claim 1, characterized in that, The oil return chamber is also provided with an oil return channel, which connects the oil return chamber to the outside. When the adapter gearbox is in the assembled position, the oil return chamber is located at the lower part of the outer shell, and the oil return channel extends downward from the oil return chamber.

5. The adapter gearbox housing as described in claim 4, characterized in that, The inner diameter of the oil return channel gradually decreases downward from the oil return cavity, so that the oil return channel as a whole is funnel-shaped.

6. The adapter gearbox housing as described in claim 1, characterized in that, The free end face of the oil return channel is provided with a flange hole.

7. The adapter gearbox housing as described in claim 1, characterized in that, The outer shell is further provided with a support plate, which extends from the outer shell toward the interior, and the extension direction of the support plate is parallel to the plane where the second opening is located. When the second gear assembly is installed in the second opening, the support plate is located near the end face of the second gear in the second gear assembly.

8. The adapter gearbox housing as described in claim 7, characterized in that, The outer casing is also provided with a third oil return port, which connects the interior of the outer casing and the oil return chamber near the support plate.

9. An aircraft engine transmission system, characterized in that, Includes a drive gear set, a driven gear set, and an aircraft engine transmission system as described in any one of claims 1 to 8; The first opening is used to install the driving gear set, and the second opening is used to install the driven gear set.

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