A dual-spool turbofan engine built-in starter-generator mounting structure

Abstract

The application belongs to the technical field of double-rotor turbofan engine structure design, and particularly relates to a built-in starter-generator mounting structure of a double-rotor turbofan engine, which only needs to slightly modify an intermediate casing and an integrated compressor disc shaft of the double-rotor turbofan engine, so that reliable connection and fixation of the starter-generator in the engine can be realized.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of structural design of a dual-rotor turbofan engine, and particularly relates to a built-in starter-generator mounting structure of a dual-rotor turbofan engine. BACKGROUND

[0002] The starter-generator is a core component of an aviation multi-electric engine, is integrated on a main shaft of the aviation engine, can extract power from the main shaft, meets the power demand of electrical accessories of the engine and on-board electronic equipment, and simultaneously, the starter-generator mounting does not need to set a central transmission, a mechanical and hydraulic structure of an accessory case, and can effectively reduce the weight of the engine and improve the performance of the engine.

[0003] At present, the starter-generator is mostly mounted on the engine by means of a coupling or a speed reducer, or is connected to the engine by means of a center pull rod and a locking nut.

[0004] The starter-generator is mounted on the engine by means of the coupling or the speed reducer, is limited by the non-hollow structure of the coupling or the speed reducer, can only be connected in series in front of or behind the engine, is only applicable to a single-rotor engine, a core engine, or a low-pressure rotor of a dual-rotor engine, and cannot be applied to a dual-rotor turbofan engine.

[0005] The starter-generator is mounted on the engine by means of the center pull rod and the locking nut, is only applicable to a turbo-shaft engine which has a relatively small volume and a relatively simple structure, and is difficult to be applicable to a dual-rotor turbofan engine which has a relatively large volume and a relatively complex structure, and has many space constraints and complex working conditions such as impact and vibration. If the starter-generator is mounted by means of the center pull rod and the locking nut, the internal structure of the dual-rotor turbofan engine needs to be greatly modified, and there is a great risk of vibration.

[0006] The present application is proposed in view of the existence of the above technical defects. SUMMARY

[0007] The purpose of the present application is to provide a built-in starter-generator mounting structure of a dual-rotor turbofan engine, so as to overcome or alleviate at least one aspect of the technical defects of the known.

[0008] The technical scheme of the present application is as follows:

[0009] A built-in starter-generator mounting structure of a dual-rotor turbofan engine, comprising a mounting shaft sleeve, a mounting disc, and a starter-generator.

[0010] The mounting shaft sleeve is sleeved on a front end of an integrated compressor disc shaft of the dual-rotor turbofan engine, and is in spline cooperation with the integrated compressor disc shaft.

[0011] A first locking nut is screwed on the front end of the integrated compressor disc shaft, and the first locking nut is pressed against the front end of the mounting shaft sleeve.

[0012] The installation disc is arranged in the intermediate casing of the dual-rotor turbofan engine, and the outer edge thereof is connected to the inner side of the intermediate casing; the first roller bearing is arranged in the installation disc and is sleeved on the installation shaft sleeve;

[0013] The second locking nut is screwed on the installation shaft sleeve, and cooperates with the first stop boss formed on the installation shaft sleeve to axially clamp the first roller bearing;

[0014] The starter generator is arranged in the intermediate casing and comprises a motor shaft, a motor rotor, a motor stator and a motor housing;

[0015] The motor shaft sleeve is arranged on the outer periphery of the installation shaft sleeve and is in spline cooperation with the installation shaft sleeve;

[0016] The motor rotor is sleeved on the outer periphery of the motor shaft, the motor stator is sleeved on the outer periphery of the motor rotor, and the motor housing is sleeved on the outer periphery of the motor stator;

[0017] The first fold-back elastic supporting structure is connected to the front end of the motor housing, the second roller bearing is arranged in the first fold-back elastic supporting structure and is sleeved on the motor shaft;

[0018] The third locking nut is screwed on the front end of the motor shaft and cooperates with the second stop boss formed on the motor shaft to axially clamp the second roller bearing;

[0019] The installation edge is formed on the motor housing, and the outer edge of the installation edge is connected to the inner side of the intermediate casing;

[0020] The fourth locking nut is screwed on the front end of the integrated compressor disc shaft and is pressed on the first locking nut and the front end of the motor shaft.

[0021] Optionally, in the built-in starter generator mounting structure of the dual-rotor turbofan engine, the installation shaft sleeve is in cylindrical surface cooperation with the integrated compressor disc shaft at both ends;

[0022] The front end of the motor shaft is in cylindrical surface cooperation with the installation shaft sleeve.

[0023] Optionally, in the built-in starter generator mounting structure of the dual-rotor turbofan engine, the first locking nut is in conical surface cooperation with the front end of the installation shaft sleeve;

[0024] The fourth locking nut is in conical surface cooperation with the first locking nut.

[0025] Optionally, in the built-in starter generator mounting structure of the dual-rotor turbofan engine, the outer edge of the installation disc is connected to the first installation boss arranged in the intermediate casing by bolts and is in stop cooperation with the first installation boss;

[0026] The front end of the motor housing is bolted to the first elastic support structure and is matched with the first elastic support structure through a stop.

[0027] The outer edge of the mounting edge is bolted to the second mounting boss arranged in the intermediate casing and is matched with the second mounting boss through a stop.

[0028] Optionally, the built-in starter generator mounting structure of the dual-rotor turbofan engine further comprises a rotor support structure.

[0029] The rotor support structure is arranged in the intermediate casing and is connected to the inner side of the intermediate casing and is located behind the mounting disc.

[0030] The rotor support structure is provided with two elastic support structures, and the two elastic support structures are respectively provided with a ball bearing and a third roller bearing.

[0031] The ball bearing and the third roller bearing are sleeved on the mounting sleeve, and the ball bearing is located in front of the third roller bearing.

[0032] Optionally, in the built-in starter generator mounting structure of the dual-rotor turbofan engine, the rotor support structure is bolted to the third mounting boss arranged in the intermediate casing and is matched with the third mounting boss through a stop.

[0033] Optionally, in the built-in starter generator mounting structure of the dual-rotor turbofan engine, a first distance sleeve is sleeved on the mounting sleeve.

[0034] The first distance sleeve is located between the ball bearing and the third roller bearing.

[0035] Optionally, in the built-in starter generator mounting structure of the dual-rotor turbofan engine, a second distance sleeve and an adjusting washer are sleeved on the mounting sleeve.

[0036] The adjusting washer is located between the third stop boss formed on the second distance sleeve and the mounting sleeve, and the second distance sleeve is tightly pressed on the fourth stop boss formed on the mounting sleeve and the third roller bearing.

[0037] The application has at least the following beneficial technical effects:

[0038] The built-in starter generator mounting structure of the dual-rotor turbofan engine only needs to slightly modify the intermediate casing and the integrated compressor disc shaft of the dual-rotor turbofan engine, so that the reliable connection and fixation of the starter generator in the engine can be realized. BRIEF DESCRIPTION OF DRAWINGS

[0039] Figure 1 is a schematic view of the built-in starter generator mounting structure of the dual-rotor turbofan engine provided by the application;

[0040] Figure 2 is a detailed view of the built-in starter generator mounting structure of the dual-rotor turbofan engine provided by the embodiment of the present application;

[0041] wherein:

[0042] 1 - mounting shaft sleeve; 2 - mounting disc; 3 - starter generator; 4 - first locking nut; 5 - first roller bearing; 6 - second locking nut; 7 - motor rotating shaft; 8 - motor rotor; 9 - motor stator; 10 - motor housing; 11 - first return type elastic supporting structure; 12 - second roller bearing; 13 - third locking nut; 14 - mounting edge; 15 - fourth locking nut; 16 - rotor supporting structure; 17 - ball bearing; 18 - third roller bearing; 19 - first distance sleeve; 20 - second distance sleeve; 21 - adjusting washer; 22 - intermediate gearbox; 23 - integrated compressor disc shaft.

[0043] In order to better illustrate the embodiment, some contents in the drawings will be omitted, enlarged or reduced, which are only used for exemplary illustration and cannot be understood as the limitation of the present application. DETAILED DESCRIPTION

[0044] In order to make the technical scheme of the present application and its advantages clearer, the technical scheme of the present application will be further clearly and completely described in combination with the drawings. It should be understood that the specific embodiments described herein are only part of the embodiments of the present application, which are used to explain the present application, but not to limit the present application. It should be noted that, in order to facilitate the description, only the parts related to the present application are shown in the drawings, and other related parts can be referred to the general design.

[0045] In addition, unless otherwise defined, the technical terms or scientific terms used in the description of the present application should be the general meanings understood by the general technical personnel in the field of the present application. In the description of the present application, “including” indicates that the concept appearing before the word covers the concepts listed after the word and its equivalents, and does not exclude other associated concepts.

[0046] In addition, the words expressing the position used in the description of the present application are only used to express the relative direction or position relationship, and when the absolute position of the described object changes, the relative position relationship may also change accordingly. It should be noted that, unless otherwise specified and limited, “mounting”, “connecting” and other similar words used in the description of the present application should be understood in a broad sense, for example, the connection can be fixed connection, or detachable connection; can be mechanical connection, or electrical connection; can be directly connected, or indirectly connected through intermediate medium, and the person skilled in the art can understand the specific meaning of the present application according to the specific circumstances.

[0047] A dual-rotor turbofan engine built-in starter-generator mounting structure, as shown in Figure 1 comprises a mounting sleeve 1, a mounting disc 2 and a starter-generator 3.

[0048] The mounting sleeve 1 is sleeved on the front end of the integrated compressor disc shaft 23 of the dual-rotor turbofan engine and is circumferentially positioned by spline fitting with the integrated compressor disc shaft 23.

[0049] The mounting sleeve 1 is in surface contact with the integrated compressor disc shaft 23 at both ends for centering.

[0050] The first locking nut 4 is screwed on the front end of the integrated compressor disc shaft 23, is pressed against the front end of the mounting sleeve 1, axially positions the mounting sleeve 1, and is in surface contact with the front end of the mounting sleeve 1 for quick centering.

[0051] The mounting disc 2 is arranged in the intermediate casing 22 of the dual-rotor turbofan engine, with its outer edge connected to the inner side of the intermediate casing 22, specifically by being bolted to the first mounting boss arranged in the intermediate casing 22 and being in butt joint with the first mounting boss.

[0052] The first roller bearing 5 is arranged in the mounting disc 2 and is sleeved on the mounting sleeve 1.

[0053] The second locking nut 6 is screwed on the mounting sleeve 1 and is in axial clamping with the first stop boss formed on the mounting sleeve 1 to axially position the first roller bearing 5.

[0054] The starter-generator 3 is arranged in the intermediate casing 22 and comprises a motor rotating shaft 7, a motor rotor 8, a motor stator 9 and a motor housing 10, as shown in Figure 2 .

[0055] The motor rotating shaft 7 is sleeved on the outer periphery of the mounting sleeve 1 and is circumferentially positioned by spline fitting with the mounting sleeve 1, with the front end of the motor rotating shaft 7 in surface contact with the mounting sleeve 1 for centering.

[0056] The motor rotor 8 is sleeved on the outer periphery of the motor rotating shaft 7, the motor stator 9 is sleeved on the outer periphery of the motor rotor 8, and the motor housing 10 is sleeved on the outer periphery of the motor stator 9.

[0057] The first return type elastic supporting structure 11 is connected to the front end of the motor housing 10, specifically by being bolted to the first return type elastic supporting structure 11 and being in butt joint with the first return type elastic supporting structure 11, and the second roller bearing 12 is arranged in the first return type elastic supporting structure 11 and is sleeved on the motor rotating shaft 7.

[0058] In order to facilitate assembly, the first elastic support structure 11 can be designed in detail, for example, the first elastic support structure 11 can be designed to be composed of a plurality of bolted structures.

[0059] The third locking nut 13 is screwed on the front end of the motor shaft 7, and cooperates with the second stop boss formed on the motor shaft 7 to axially clamp and position the second roller bearing 12.

[0060] The installation edge 14 is formed on the motor housing 10, and the outer edge of the installation edge 14 is connected to the inner side of the intermediate casing 22. Specifically, the outer edge of the installation edge 14 can be bolted to the second installation boss arranged inside the intermediate casing 22, and cooperates with the second installation boss through a stop.

[0061] The fourth locking nut 15 is screwed on the front end of the integrated compressor disc shaft 23, and is pressed on the first locking nut 4 and the front end of the motor shaft 7 to axially position the motor shaft 7, i.e. to axially position the generator 3. The fourth locking nut 15 cooperates with the first locking nut 4 through a conical surface to quickly center, which helps to maintain the coaxiality between the motor shaft 7, the mounting sleeve 1 and the integrated compressor disc shaft 23.

[0062] The cable on the generator 3 is drawn out through the lead hole formed on the intermediate casing 22.

[0063] The rotor support structure 16 is further arranged inside the intermediate casing 22. The rotor support structure 16 is located behind the mounting disc 2 and is connected to the inner side of the intermediate casing 22. Specifically, the rotor support structure 16 can be bolted to the third installation boss arranged inside the intermediate casing 22, and cooperates with the third installation boss through a stop.

[0064] The rotor support structure 16 has two elastic support structures, and the two elastic support structures are respectively provided with a ball bearing 17 and a third roller bearing 18. The ball bearing 17 and the third roller bearing 18 are sleeved on the mounting sleeve 1, and the ball bearing 17 is located in front of the third roller bearing 18.

[0065] The rotor support structure 16 supports the high-pressure rotor of the dual-rotor turbofan engine through the ball bearing 17 and the third roller bearing 18. The ball bearing 17 is mainly used to bear the axial force generated by the engine, and the third roller bearing 18 cooperates with the first roller bearing 5 and the second roller bearing 12 to bear the radial load generated by the engine and the generator 3. The first roller bearing 5 is not only the support structure of the motor shaft 7 of the generator 3, but also the auxiliary support of the rotor support structure 16.

[0066] The first distance sleeve 19 is sleeved on the mounting sleeve 1 and is located between the ball bearing 17 and the third roller bearing 18.

[0067] The second distance sleeve 20 and the adjusting washer 21 are sleeved on the mounting sleeve 1. The adjusting washer 21 is located between the second distance sleeve 20 and the third stop boss formed on the mounting sleeve 1, and the second distance sleeve 20 is pressed against the fourth stop boss formed on the mounting sleeve 1 and the third roller bearing 18. The adjusting washer 21 can be used to adjust the axial distance between the high-pressure rotor and the stator of the dual-rotor turbofan engine to meet the working requirements.

[0068] In the built-in starter-generator mounting structure of the dual-rotor turbofan engine disclosed in the above embodiment, the starter-generator 3 is arranged in the cavity of the intermediate nacelle 22 of the dual-rotor turbofan engine. The starter-generator 3 is connected and fixed to the intermediate nacelle 22 by bolts through the mounting edge 14 formed on the motor housing 10, and the motor shaft 7 is axially positioned on the mounting sleeve 1 by the fourth locking nut 15. The motor shaft 7 is centered by a cylindrical surface and is circumferentially positioned by a spline structure. The mounting sleeve 1 is circumferentially positioned on the integrated compressor disc shaft 23 by a spline and is axially positioned by the first locking nut 4. In this way, the starter-generator 3 is reliably connected and fixed to the integrated compressor disc shaft 23 of the dual-rotor turbofan engine.

[0069] The first return-type elastic support structure 11 and the second roller bearing 12 are arranged at the front end of the starter-generator 3, and the mounting disc 2 and the first roller bearing 5 are arranged at the rear end of the starter-generator 3. Together with the two return-type elastic support structures and the ball bearing 17 and the third roller bearing 18 on the rotor support structure 16, they realize the support of the high-pressure rotor of the dual-rotor turbofan engine.

[0070] The first roller bearing 5, the second roller bearing 12, the ball bearing 17, and the third roller bearing 18 are reliably connected and fixed to the intermediate nacelle 22 of the dual-rotor turbofan engine through the mounting disc or the return-type elastic support structure, and load transmission is realized. The rationality of the force bearing and force transmission path of the starter-generator 3 and the engine is ensured. In addition, the combination of bearing support point layout and return-type elastic support structure can effectively reduce the support stiffness and reduce the vibration level of the structure, ensuring that the working speed of the rotor component and the critical speed have a reasonable margin.

[0071] The double-rotor turbofan engine built-in starter-generator mounting structure disclosed in the above embodiments only needs to slightly modify the intermediate casing (22) and the integrated compressor disc shaft (23) of the double-rotor turbofan engine, so that the reliable connection and fixation of the starter-generator (3) in the engine can be realized, and through the combined design of the bearing support point layout and the return type elastic support structure, the vibration risk of the rotor components can be effectively reduced, so that the working speed and the critical speed have a reasonable margin.

[0072] So far, the technical solution of the present application has been described in combination with the preferred embodiments shown in the drawings. It should be understood by those skilled in the art that the protection scope of the present application is obviously not limited to these specific embodiments. Without deviating from the principles of the present application, those skilled in the art can make equivalent changes or replacements to the related technical features, and the technical solutions after these changes or replacements will fall within the protection scope of the present application.

Claims

1. A dual-spool turbofan engine built-in starter generator mounting structure, characterized by, The installation structure comprises an installation sleeve (1), an installation disc (2), and a starter generator (3); The installation sleeve (1) is sleeved on the front end of an integrated compressor disc shaft (23) of the dual-rotor turbofan engine and is in spline cooperation with the integrated compressor disc shaft (23); The front end of the integrated compressor disc shaft (23) is screwed with a first locking nut (4), and the first locking nut (4) is pressed against the front end of the installation sleeve (1); The installation disc (2) is arranged in an intermediate casing (22) of the dual-rotor turbofan engine, and the outer edge of the installation disc (2) is connected to the inner side of the intermediate casing (22); the first roller bearing (5) is arranged in the installation disc (2) and is sleeved on the installation sleeve (1); The second locking nut (6) is screwed on the installation sleeve (1) and is in cooperation with the first stop boss formed on the installation sleeve (1) to axially clamp the first roller bearing (5); The starter generator (3) is arranged in the intermediate casing (22) and comprises a motor rotating shaft (7), a motor rotor (8), a motor stator (9), and a motor shell (10); The motor rotating shaft (7) is sleeved on the outer periphery of the installation sleeve (1) and is in spline cooperation with the installation sleeve (1); The motor rotor (8) is sleeved on the outer periphery of the motor rotating shaft (7), the motor stator (9) is sleeved on the outer periphery of the motor rotor (8), and the motor shell (10) is sleeved on the outer periphery of the motor stator (9); The front end of the motor shell (10) is connected with a first return type elastic supporting structure (11), the second roller bearing (12) is arranged in the first return type elastic supporting structure (11) and is sleeved on the motor rotating shaft (7); The third locking nut (13) is screwed on the front end of the motor rotating shaft (7) and is in cooperation with the second stop boss formed on the motor rotating shaft (7) to axially clamp the second roller bearing (12); The installation edge (14) is formed on the motor shell (10) and the outer edge of the installation edge (14) is connected to the inner side of the intermediate casing (22); The fourth locking nut (15) is screwed on the front end of the integrated compressor disc shaft (23) and is pressed against the first locking nut (4) and the front end of the motor rotating shaft (7).

2. The installation structure according to claim 1, wherein The two ends of the installation sleeve (1) are in cylindrical surface cooperation with the integrated compressor disc shaft (23); The front end of the motor rotating shaft (7) is in cylindrical surface cooperation with the installation sleeve (1).

3. The installation structure according to claim 2, wherein The first locking nut (4) is in conical surface cooperation with the front end of the installation sleeve (1); The fourth locking nut (15) is in conical surface cooperation with the first locking nut (4).

4. The installation structure according to claim 3, wherein The outer edge of the installation disc (2) is bolted on the first installation boss arranged in the intermediate casing (22) and is in cooperation with the first installation boss through a stop. The front end of the motor housing (10) is bolted to the first folded elastic support structure (11), and the first folded elastic support structure (11) is matched with the front end of the motor housing (10) through a stop. The outer edge of the mounting edge (14) is bolted to the second mounting boss arranged in the intermediate casing (22), and the second mounting boss is matched with the outer edge of the mounting edge (14) through a stop.

5. The dual-spool turbofan engine built-in starter generator mounting structure according to Claim 4, characterized in that, The rotor support structure (16) is also included. The rotor support structure (16) is arranged in the intermediate casing (22) and connected to the inner side of the intermediate casing (22) behind the mounting disc (2). The rotor support structure (16) has two folded elastic support structures, and the two folded elastic support structures are respectively provided with a ball bearing (17) and a third roller bearing (18). The ball bearing (17) and the third roller bearing (18) are sleeved on the mounting shaft sleeve (1), and the ball bearing (17) is located in front of the third roller bearing (18).

6. The dual-rotor turbofan engine built-in starter generator mounting structure according to claim 5, wherein The rotor support structure (16) is bolted to the third mounting boss arranged in the intermediate casing (22), and the third mounting boss is matched with the rotor support structure (16) through a stop.

7. The dual-rotor turbofan engine built-in starter generator mounting structure according to claim 6, wherein The first distance sleeve (19) is sleeved on the mounting shaft sleeve (1). The first distance sleeve (19) is located between the ball bearing (17) and the third roller bearing (18).

8. The dual-rotor turbofan engine built-in starter generator mounting structure according to claim 7, wherein The second distance sleeve (20) and the adjusting washer (21) are sleeved on the mounting shaft sleeve (1). The adjusting washer (21) is located between the second distance sleeve (20) and the third stop boss formed on the mounting shaft sleeve (1), and the second distance sleeve (20) is tightly pressed on the fourth stop boss formed on the mounting shaft sleeve (1) and the third roller bearing (18).

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