Aero-engine transmission system and switching gear box body thereof

Abstract

The invention aims to provide an aero-engine transmission system and a switching gear box body thereof. The switching gear box body comprises a first opening used for installing a first gear assembly, a second opening used for installing a second gear assembly and an outer shell extending from the first opening to the second opening. Wherein the plane where the first opening is located is not parallel to the plane where the second opening is located, the cross section of the outer shell is in a circular ring shape, and the outer shell extends between the first opening and the second opening along an arc line. By means of the switching gear box body, backflow of lubricating oil can be facilitated.

Description

Technical Field

[0001] The invention relates to the field of gas turbine engine transmission systems, and in particular to an aircraft engine transmission system and a transfer gear box thereof. Background Art

[0002] When the gear shaft of the aircraft engine transmission system runs at high speed, the bevel gear pair in the transfer gear box will generate a lot of heat and air turbulence in the gear box when the transmission direction and transmission ratio are changed. The lubricating oil in the box plays a role in lubrication and taking away the heat. Figure 1 as well as Figure 2 A schematic diagram of an existing transfer gearbox is shown, wherein the existing transfer gearbox includes an outer shell 91 and a driving wheel 92 and a driven wheel 93 arranged inside the outer shell, and the driving wheel 92 and the driven wheel 93 are fixed in the outer shell 91 through a driving wheel bearing seat 94 and a driven wheel bearing seat 95 respectively.

[0003] However, Figure 1 to Figure 2 In the current gearbox structure shown, the lubricating oil is prone to poor oil return, which in turn causes a sharp increase in the gearbox casing wall temperature and leads to an alarm shutdown. Summary of the invention

[0004] The object of the present invention is to provide a transfer gear housing which can facilitate the return of lubricating oil.

[0005] The transfer gear housing for achieving the above-mentioned purpose 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 shell extending from the first opening to the second opening,

[0009] 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 in a circular ring shape, extending along an arc between the first opening and the second opening.

[0010] In one or more embodiments, the transfer gear housing further includes an oil return chamber, which is disposed outside the outer housing and extends along an arc between the first opening and the second opening, and an extension direction of the oil return chamber corresponds to an extension direction of the outer housing.

[0011] In one or more embodiments, a plurality of reinforcing ribs are further provided on the periphery of the outer shell, each of the reinforcing ribs extends 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;

[0012] Wherein, a plurality of reinforcing rib plates are arranged around the outer shell and avoid the location of the oil return cavity.

[0013] In one or more embodiments, a first oil return port and a second oil return port are provided on the outer shell, wherein the first oil return port connects the interior of the outer shell with the oil return chamber at a position close to the first opening, and the second oil return port connects the interior of the outer shell with the oil return chamber at a position close to the second opening.

[0014] In one or more embodiments, an oil return channel is further provided in the oil return chamber, and the oil return channel connects the oil return chamber with the outside;

[0015] Wherein, when the transfer gear housing is in the assembly state, the oil return chamber is located at the lower part of the outer housing, and the oil return channel extends downward from the oil return chamber.

[0016] In one or more embodiments, the inner diameter of the oil return passage gradually decreases downward from the oil return chamber, so that the oil return passage is funnel-shaped as a whole.

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

[0018] In one or more embodiments, a support plate is further disposed in the outer shell, and the support plate extends from the outer shell toward the inside, and the extension 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 end surface of the second gear in the second gear assembly.

[0020] In one or more embodiments, a third oil return port is further provided on the outer shell, and the third oil return port connects the interior of the outer shell with the oil return chamber at a position close to the support plate.

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

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

[0023] The beneficial effects of the present invention are:

[0024] In the present transfer gear housing, the outer housing is formed into an arc-shaped tube as a whole, and the inner peripheral wall of the outer housing extends along an arc between the first opening and the second opening, so that the housing structure is changed from a traditional square box to an arc-shaped cylinder, so that the inner wall of the outer housing is a smooth arc surface, which is more conducive to the return of lubricating oil and can reduce the local stress concentration of the outer housing. The problem of poor oil return in the existing gear box structure is reduced.

[0025] The above description is only an overview of the technical solution of the present application. In order to more clearly understand the technical means of the present application, it can be implemented in accordance with the contents of the specification. In order to make the above and other purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are listed below. BRIEF DESCRIPTION OF THE DRAWINGS

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

[0027] Figure 1 to Figure 2 A schematic diagram of an existing gearbox structure is shown;

[0028] Figure 3 Shows a stereoscopic schematic diagram of some embodiments of the transfer gear housing;

[0029] Figure 4 A half-section schematic diagram of some embodiments of the transfer gear housing is shown;

[0030] Figure 5 A half-section schematic diagram of some embodiments of the transfer gear housing under actual working conditions is shown. DETAILED DESCRIPTION

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

[0032] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by technicians in the technical field to which this application belongs; the terms used herein are only for the purpose of describing specific embodiments and are not intended to limit this application; the terms "including" and "having" in the specification and claims of this application and the above-mentioned figure descriptions and any variations thereof are intended to cover non-exclusive inclusions.

[0033] In order to solve the problem that the lubricating oil in the existing gear box structure is prone to poor oil return, on the one hand, according to some embodiments of the present application, a transfer gear box body is provided. Figure 3 shows a stereoscopic schematic diagram of some embodiments of the transfer gear housing, Figure 4 shows a half-section schematic diagram of some embodiments of the transfer gear housing, Figure 5 A half-section schematic diagram of some embodiments of the transfer gear housing under actual working conditions is shown.

[0034] The transfer gear housing includes a first opening 1 for installing a first gear assembly 101, a second opening 2 for installing a second gear assembly 102, and an outer shell 3, and the outer shell 3 extends from the first opening 1 to the second opening 2. It can be understood that in some other description methods, the first opening 1 and the second opening 2 can also be regarded as being respectively opened / formed at both ends of the outer shell 3.

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

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

[0037] With such configuration, the outer shell 3 is in an arc-shaped tube shape as a whole, and the inner peripheral wall of the outer shell 3 extends along an arc between the first opening 1 and the second opening 2, and 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 3 is a smooth arc surface, which is more conducive to the return of lubricating oil and can reduce the local stress concentration of the outer shell. The problem of poor oil return in the existing gearbox structure is reduced.

[0038] In the description of the embodiments of the present application, the technical terms "first" and "second", such as "first opening", "second opening", etc., are only used to distinguish different objects and cannot be understood 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 "embodiments" herein means that a particular feature, structure, or characteristic described in conjunction with the embodiments may be included in at least one embodiment of the present application. The appearance of the phrase in various locations in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0040] Please refer to Figure 3 as well as Figure 4 In some embodiments of the present transfer gearbox, the transfer gearbox further comprises an oil return chamber 4, which is arranged outside the outer shell 3 and extends along an arc between the first opening 1 and the second opening 2. The extension direction of the oil return chamber 4 corresponds to the extension direction of the outer shell 3. It can be understood that the oil return chamber 4 and the outer shell 3 both extend along an arc. The corresponding extension directions of the two refer to the conformal arrangement of the arc where the oil return chamber 4 extends and the arc where the outer shell 3 extends. With such a configuration, the traditional structure of the inner part of the casing directly connected to the oil outlet is abandoned, and the present case adopts a double-layer cavity structure, that is, the oil return channel is used as a separate arc-shaped cavity, so that the oil return chamber 4 is independently arranged inside the outer shell 3, which can avoid the interference of the air vortex caused by the operation of the gear pair in the outer shell, and ensure the smooth return of oil. At the same time, the oil return chamber 4 also adopts a wider arc-shaped cylindrical shape, which can ensure the stability and effectiveness of the oil return function under different flight postures, and further improve the reliability of the present transfer gearbox.

[0041] Please refer to Figure 3 as well as Figure 4 In some embodiments of the present transfer gearbox, a plurality of reinforcing ribs 30 are further provided on the outer periphery of the outer shell 3, each reinforcing rib 30 extending along an arc between the first opening 1 and the second opening 2, and the extension direction of each reinforcing rib 30 corresponds to the extension direction of the outer shell 3, wherein the plurality of reinforcing ribs 30 are arranged circumferentially around the outer shell 3, and the arc where the extension direction of each reinforcing rib 30 is located and the arc where the extension direction of the outer shell 3 at the connection point is located are arranged conformally to each other, and at the same time, the reinforcing ribs 30 avoid the location of the oil return chamber. By providing the reinforcing ribs 30 on the outer periphery of the outer shell 3, the heat dissipation area of ​​the casing surface can be increased while ensuring the reliable strength of the present transfer gearbox.

[0042] See also Figure 4In some embodiments of the transfer gearbox, a first oil return port 31 and a second oil return port 32 are provided on the outer shell 3. The first oil return port 31 is connected to the inner part of the outer shell 3 and the oil return chamber 4 at a position close to the first opening 1, and the second oil return port 32 is connected to the inner part of the outer shell 3 and the oil return chamber 4 at a position close to the second opening 2. By arranging two oil return ports, the gearbox can smoothly return oil in different flight postures (forward tilt, backward tilt, left tilt, right tilt) to avoid oil accumulation.

[0043] See also Figure 3 In some embodiments of the transfer gear housing, an oil return channel 40 is further provided in the oil return chamber 4, and the oil return channel 40 connects the oil return chamber 4 with the outside, wherein the transfer gear housing is in an assembled state position (such as Figure 3 When the oil return chamber 4 is in the position shown in the figure, the oil return chamber 4 is located at the lower part of the outer shell 3, and the oil return channel 40 extends downward from the oil return chamber 4. By setting the oil return channel 40, the accumulated lubricating oil in the oil return chamber 4 can be discharged to avoid accumulation.

[0044] For further information, see Figure 3 In some embodiments of the present transfer gear housing, the inner diameter of the oil return channel 40 gradually decreases downward from the oil return chamber 4, so that the oil return channel 40 is funnel-shaped as a whole. This structure can ensure a larger cross-sectional area of ​​the oil return port and a lower oil return port position.

[0045] For further information, see Figure 3 In some embodiments of the present transfer gear housing, a flange hole is provided on the free end surface of the oil return passage 40 to connect with an external device to guide the lubricating oil out.

[0046] See also Figure 4 as well as Figure 5 In some embodiments of the transfer gear housing, a support plate 33 is further provided in the outer housing 3, and the support plate 33 extends from the outer housing 3 toward the inside, and the extension 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 surface of the second gear 1020 in the second gear assembly 102. By providing the support plate 33, while enhancing the strength of the housing, the mutual influence of the vortex between the first gear assembly 101 and the second gear assembly 102 can be weakened, the vortex direction can be changed or the vortex generation can be destroyed, and the smooth return of oil can be further facilitated.

[0047] In a specific embodiment, the support plate 33 is semicircular so as not to completely close the outer shell 3 .

[0048] For further information, see Figure 4In some embodiments of the transfer gearbox, a third oil return port 34 is also provided in the outer shell 3, and the third oil return port 34 connects the inner part of the outer shell 3 with the oil return chamber 4 at a position close to the support plate 33. By providing 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 distributed in an arc shape as a whole, which can effectively ensure that the transfer gearbox can smoothly return oil in different flight postures (forward tilt, backward tilt, left tilt, right tilt) to avoid oil accumulation. At the same time, casting an oil path between the inner wall of the outer shell and the support plate 33 can intermittently shorten the length of the nozzle inside the gearbox.

[0049] According to the arc cross-section of the transfer gear case, the surface heat dissipation ribs, the separate oil return chamber and the support plate structure inside the casing proposed in one or more of the aforementioned embodiments, compared with the traditional casing structure, the casing wall thickness can be effectively thinned while ensuring equal strength, thereby achieving a weight reduction of 10% to 15%, while increasing the casing surface heat dissipation area by 15% to 20%.

[0050] On the other hand, according to some embodiments of the present 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 transfer gear housing as described in one or more of the previous embodiments, the driving gear set is installed to the first opening 1 through, for example, a bearing seat, and the driven gear set is installed to the second opening 2 through, for example, a bearing seat.

[0051] In the description of the embodiments of the present application, “plurality” means more than two, unless otherwise clearly and specifically defined.

[0052] In the description of the embodiments of the present application, unless otherwise clearly specified and limited, technical terms such as "installed", "connected", "connected", "fixed" and the like 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 an indirect connection through an intermediate medium, and it can be the internal connection of two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the embodiments of the present application can be understood according to the specific circumstances.

[0053] It should be understood that "along" a certain direction mentioned in the text means that there is at least a component in the direction, preferably, the angle with the direction is within 10°, and 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 the present application, rather than to limit them; although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein by equivalents; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application, and they should all be included in the scope of the claims and specification of the present application. In particular, as long as there is no structural conflict, the various technical features mentioned in the various embodiments can be combined in any way. The present application is not limited to the specific embodiments disclosed herein, but includes all technical solutions that fall within the scope of the claims.

Claims

1. A transfer gear housing, characterized in that: include: A first opening for mounting a first gear assembly; a second opening for mounting a second gear assembly; as well as 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 in a circular ring shape, extending along an arc between the first opening and the second opening.

2. The transfer gear housing according to claim 1, characterized in that: The transfer gear housing further comprises an oil return chamber, 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 oil return chamber corresponds to the extension direction of the outer housing.

3. The transfer gear housing according to claim 2, characterized in that: A plurality of reinforcing ribs are also provided on the periphery of the outer shell, each of the reinforcing ribs extends 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; Wherein, a plurality of reinforcing rib plates are arranged around the outer shell and avoid the location of the oil return cavity.

4. The transfer gear housing according to claim 2, characterized in that: The outer shell is provided with a first oil return port and a second oil return port. The first oil return port connects the interior of the outer shell with the oil return chamber at a position close to the first opening, and the second oil return port connects the interior of the outer shell with the oil return chamber at a position close to the second opening.

5. The transfer gear housing according to claim 2, characterized in that: The oil return chamber is also provided with an oil return passage, and the oil return passage connects the oil return chamber with the outside; Wherein, when the transfer gear housing is in the assembly state, the oil return chamber is located at the lower part of the outer housing, and the oil return channel extends downward from the oil return chamber.

6. The transfer gear housing according to claim 5, characterized in that: The inner diameter of the oil return passage gradually decreases downward from the oil return chamber, so that the oil return passage is funnel-shaped as a whole.

7. The transfer gear housing according to claim 5, characterized in that: The free end surface of the oil return channel is provided with a flange hole.

8. The transfer gear housing according to claim 2, characterized in that: A support plate is also provided in the outer shell, and the support plate extends from the outer shell toward the inside, 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 close to the end surface of the second gear in the second gear assembly.

9. The transfer gear housing according to claim 8, characterized in that: The outer shell is also provided with a third oil return port, and the third oil return port is connected with the interior of the outer shell and the oil return chamber at a position close to the support plate.

10. An aircraft engine transmission system, characterized in that: A driving gear set, a driven gear set and an aircraft engine transmission system as claimed in any one of claims 1 to 9; 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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