Flexible connection structure of gear transmission system and gear transmission engine

Abstract

A flexible connection structure of a gear transmission system and a gear transmission engine (100) can reduce vibration transmitted from the gear transmission system to a low-pressure turbine system (160) and a fan rotor system (180) respectively and can compensate for a misalignment state caused by the vibration. Comprising an input shaft (150) connecting a turbine system to a gear transmission system, the input shaft (150) comprising: a thin-walled stub shaft (151) having drum splines (1511, 1512) formed at both ends; and a disc input shaft (152) having flat splines (1531, 1532) formed at both ends thereof, the thin-walled short shaft and the disc input shaft being connected to each other such that the drum spline (1511) and the flat spline (1532) mesh with each other.

Description

Technical Field

[0001] The present invention relates to a flexible connection structure of a gear transmission system and a geared engine, and more particularly to a flexible connection structure of a gear transmission system and a geared engine applied to the aviation field. Background Art

[0002] In the prior art, as an engine for providing power to an aircraft, there is a geared engine configured such that a gear reduction system is connected between a low-pressure turbine rotor and a fan rotor, and the work generated by the low-pressure turbine is transmitted to the fan rotor through the gear reduction system. Thus, while the fan rotor maintains a low speed, the speed of the low-pressure turbine rotor can be significantly increased, thereby improving the work efficiency of the low-pressure turbine rotor in increasing the thrust of the geared engine.

[0003] In the above-mentioned geared engine, the low-pressure turbine rotor is connected to the gear reduction system via an input shaft, and the gear reduction system is connected to the fan rotor via an output shaft.

[0004] During the operation of the above-mentioned geared engine, the vibration generated by the gear reduction system often transmits to the low-pressure turbine rotor and the fan rotor, resulting in relative deformation between the gear reduction system and the low-pressure turbine rotor and the fan rotor respectively, wear of the gear teeth, short service life of the gear reduction system, and low reliability.

[0005] In addition, when an aircraft including the above-mentioned geared engine flies at high altitude, due to the need of flight missions, various maneuvering flight actions will be generated. The gyroscopic moment generated by the above-mentioned maneuvering flight acts on the gear reduction system, resulting in a misaligned state between the shafts of the gear reduction system, the fan rotor, and the low-pressure turbine rotor. Summary of the Invention

[0006] The present invention is completed in view of the above technical problems, and its purpose is to provide a flexible connection structure of a gear transmission system and a geared engine. By connecting the gear transmission system between the low-pressure turbine system and the fan rotor system through the flexible connection structure, the vibration transmitted from the gear transmission system to the low-pressure turbine system and the fan rotor system respectively can be reduced, and the misaligned state between any two shafts of the low-pressure turbine system and the fan rotor system can be compensated.

[0007] To achieve the above object, a first aspect of the present invention provides a flexible connection structure of a gear transmission system, characterized in that it includes an input shaft that connects a turbine system to the gear transmission system. The input shaft includes: a thin-walled short shaft having drum-shaped splines formed at both ends; and a diaphragm input shaft having flat splines formed at both ends. The thin-walled short shaft and the diaphragm input shaft are connected to each other in such a way that the drum-shaped splines mesh with the flat splines.

[0008] According to the above structure, since the turbine system is connected to the gear transmission system through the input shaft, and the input shaft is configured to include a flexible connection portion formed by the engagement of a drum spline and a flat spline, the vibration transmitted from the gear transmission system to the turbine system can be reduced through this flexible connection portion.

[0009] In addition, since the radial space occupied by the flexible connection portion formed by the engagement of the drum spline and the flat spline is small, the space occupied by the input shaft can be saved. Moreover, since the meshing tooth surface of the drum spline is drum-shaped, the contact area with other splines can be increased and the stress concentration phenomenon between the tooth surfaces can be alleviated, thereby alleviating the contact wear between the tooth surfaces and improving the torque bearing capacity.

[0010] The flexible connection structure of the gear transmission system according to the second aspect of the present invention is based on the flexible connection structure of the gear transmission system according to the first aspect of the present invention, and is characterized in that the membrane disc input shaft further includes an input shaft membrane disc coupling, and the input shaft membrane disc coupling includes: a first shaft sleeve integrally connected to one side of the membrane disc input shaft; a second shaft sleeve integrally connected to the other side of the membrane disc input shaft; and an input shaft elastic membrane sheet elastically connecting the first shaft sleeve and the second shaft sleeve.

[0011] According to the above structure, since the input shaft elastic membrane sheet is provided in the input shaft, the misalignment state between the first shaft sleeve and the second shaft sleeve can be compensated by the elastic deformation of the input shaft elastic membrane sheet.

[0012] The flexible connection structure of the gear transmission system according to the third aspect of the present invention is based on the flexible connection structure of the gear transmission system according to the first aspect or the second aspect of the present invention, and is characterized in that it further includes an output shaft, and the output shaft includes: a gear output shaft extending from the gear transmission system and having a first double-row circular arc end tooth formed on the other side; and a membrane disc output shaft having second double-row circular arc end teeth formed at both ends, and the gear output shaft and the membrane disc output shaft are connected to each other in such a way that the first double-row circular arc end tooth meshes with the second double-row circular arc end tooth.

[0013] According to the above structure, since a flexible connection portion including the first double-row circular arc end tooth of the gear output shaft and the second double-row circular arc end tooth of the membrane disc output shaft is formed on the output shaft, and the load-bearing capacity of the double-row circular arc end tooth is good, a larger torque than the input shaft can be borne through this flexible connection portion, and

[0014] The flexible connection structure of the gear transmission system according to the fourth aspect of the present invention is based on the flexible connection structure of the gear transmission system according to the third aspect of the present invention. It is characterized in that the membrane disk output shaft further includes an output shaft membrane disk coupling, and the output shaft membrane disk coupling includes: a third shaft sleeve integrally connected to one side of the membrane disk output shaft; a fourth shaft sleeve integrally connected to the other side of the membrane disk output shaft; and an output shaft elastic membrane sheet elastically connecting the third shaft sleeve and the fourth shaft sleeve.

[0015] According to the above structure, by providing an output shaft membrane disk coupling in the membrane disk output shaft, the misalignment state between the third shaft sleeve and the fourth shaft sleeve can be compensated by the elastic deformation of the output shaft elastic membrane sheet.

[0016] The flexible connection structure of the gear transmission system according to the fifth aspect of the present invention is based on the flexible connection structure of the gear transmission system according to the third aspect of the present invention. The gear transmission system is a planetary gear system, including: a sun gear located at the center; planet gears meshing with the sun gear from the radial outside and capable of revolving and rotating relative to the sun gear; and a ring gear meshing with the planet gears from the radial outside. It is characterized in that the membrane disk input shaft is connected to the sun gear, and the membrane disk output shaft is connected to the planet gear.

[0017] According to the above structure, by connecting the membrane disk input shaft to the sun gear of the gear transmission system and connecting the membrane disk output shaft to the planet gear of the gear transmission system, the rotation of the input shaft can be transmitted to the output shaft after deceleration.

[0018] Moreover, since the input shaft has a membrane disk, the misalignment state in the input shaft can be compensated. Since the output shaft has a membrane disk, the misalignment state in the output shaft can be compensated. On this basis, the membrane disk input shaft is connected to the membrane disk output shaft via the gear transmission system. Therefore, the misalignment state within the range from the membrane disk input shaft to the membrane disk output shaft can be compensated, so that the misalignment state can be compensated within as large a range as possible.

[0019] The flexible connection structure of the gear transmission system according to the sixth aspect of the present invention is based on the flexible connection structure of the gear transmission system according to the fourth aspect of the present invention. The gear transmission system is a planetary gear system, including: a sun gear located at the center; planet gears meshing with the sun gear from the radial outside and capable of revolving and rotating relative to the sun gear; and a ring gear meshing with the planet gears from the radial outside. It is characterized in that the membrane disk input shaft is connected to the sun gear, and the membrane disk output shaft is connected to the planet gear.

[0020] According to the above structure, the input shaft with diaphragm disc is connected to the sun gear of the gear transmission system, and the output shaft with diaphragm disc is connected to the planet gear of the gear transmission system, so that the rotation of the input shaft with diaphragm disc can be transmitted to the output shaft with diaphragm disc after deceleration.

[0021] Moreover, due to the diaphragm disc on the input shaft, the misalignment state in the input shaft can be compensated. Due to the diaphragm disc on the output shaft, the misalignment state in the output shaft can be compensated. On this basis, the input shaft with diaphragm disc is connected to the output shaft with diaphragm disc via the gear transmission system. Therefore, the misalignment state within the range from the input shaft with diaphragm disc to the output shaft with diaphragm disc can be compensated, so that the misalignment state can be compensated within as large a range as possible.

[0022] The flexible connection structure of the gear transmission system according to the seventh aspect of the present invention is based on the flexible connection structure of the gear transmission system according to any one of the first, second, fourth to sixth aspects of the present invention. The feature is that the strength of the thin-walled short shaft is less than the strength of the input shaft with diaphragm disc.

[0023] According to the above structure, since the strength of the thin-walled short shaft is less than the strength of the input shaft with diaphragm disc, when the torque transmitted to the thin-walled short shaft reaches the level that causes the thin-walled short shaft and the input shaft with diaphragm disc to break, the thin-walled short shaft breaks but the input shaft with diaphragm disc does not break. Thus, the input shaft with diaphragm disc can be protected from torque, and thereby the turbine system connected to the input shaft with diaphragm disc can be protected from the influence of this torque.

[0024] The flexible connection structure of the gear transmission system according to the eighth aspect of the present invention is based on the flexible connection structure of the gear transmission system according to the third aspect of the present invention. The feature is that the strength of the thin-walled short shaft is less than the strength of the input shaft with diaphragm disc.

[0025] According to the above structure, since the strength of the thin-walled short shaft is less than the strength of the input shaft with diaphragm disc, when the torque transmitted to the thin-walled short shaft reaches the level that causes the thin-walled short shaft and the input shaft with diaphragm disc to break, the thin-walled short shaft breaks but the input shaft with diaphragm disc does not break. Thus, the input shaft with diaphragm disc can be protected from torque, and thereby the turbine system connected to the input shaft with diaphragm disc can be protected from the influence of this torque.

[0026] The ninth aspect of the present invention provides a gear transmission system, which is characterized by including: a gear transmission system; the flexible connection structure of the gear transmission system according to any one of the first aspect to the eighth aspect; a turbine system, the turbine system is connected to the gear transmission system from the input side via the flexible connection structure; and a fan rotor system; the fan rotor system is connected to the gear transmission system from the output side via the flexible connection structure.

[0027] According to the above structure, since the turbine system, the flexible connection structure, the gear transmission system, the flexible connection structure, and the fan rotor system are connected in sequence in the gear transmission system, the vibration from the gear transmission system will be reduced via the flexible connection structure, thereby reducing the vibration transmitted to the turbine system and the fan rotor system. Moreover, the flexible connection structure includes a flexible connection portion formed by the engagement of a drum spline and a flat spline and a diaphragm coupling. Therefore, not only can the vibration be alleviated, but the misalignment state can also be compensated by the elastic deformation of the elastic diaphragm in the diaphragm coupling. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings required for use in the embodiments or the prior art will be briefly introduced below. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0029] Figure 1 It is a schematic diagram showing the general structure of a gear transmission engine according to the first embodiment of the present invention.

[0030] Figure 2 It shows Figure 1 a schematic diagram of the reduction gear system and its surrounding flexible connection structure in the gear transmission engine shown.

[0031] Figure 3 It shows Figure 2 a schematic diagram of the engagement state of the drum spline and the flat spline in the flexible connection structure surrounding the reduction gear system shown.

[0032] Figure 4 It shows Figure 2 a schematic diagram of the engagement state of two sets of double-row circular arc end teeth in the flexible connection structure surrounding the reduction gear system shown.

[0033] Figure 5 It shows Figure 4 a schematic diagram of the connection state of the diaphragm output shaft and the planetary gear shaft in the engagement state shown.

[0034] (Symbol Description)

[0035] 100 Gear transmission engine;

[0036] 110 High-pressure compressor;

[0037] 120 High-pressure turbine rotor;

[0038] 130 Low-pressure turbine rotor;

[0039] 131 Low-pressure turbine rotor flat spline;

[0040] 1A0 Low-pressure turbine bearing;

[0041] 140 Low-pressure turbine rotating shaft;

[0042] 150 Input shaft;

[0043] 151 Thin-walled short shaft;

[0044] 1511 One-side crowned spline;

[0045] 1512 The other-side crowned spline;

[0046] 1513 Short shaft main body;

[0047] 152 Diaphragm coupling;

[0048] 1521 First shaft sleeve;

[0049] 1522 Second shaft sleeve;

[0050] 1523 Input shaft elastic diaphragm;

[0051] 153 Diaphragm-equipped input shaft;

[0052] 1531 One-side flat spline;

[0053] 1532 The other-side flat spline;

[0054] 160 Reduction gear system;

[0055] 161 Sun gear;

[0056] 162 Planet gear;

[0057] 163 Ring gear;

[0058] 170 Output shaft;

[0059] 171 Planet gear shaft;

[0060] 1711 Planet gear double-row circular arc end teeth;

[0061] 1712 Planet gear annular groove;

[0062] 172 Diaphragm coupling;

[0063] 1721 Third shaft sleeve;

[0064] 1722 Fourth shaft sleeve;

[0065] 1723 Output shaft elastic diaphragm;

[0066] 173 Diaphragm-equipped output shaft;

[0067] 1731 One-side double-row circular arc end teeth;

[0068] One - side annular groove 1732

[0069] One - side annular - groove bolt 1733

[0070] One - side nut 1734

[0071] The other - side double - row circular - arc end teeth 1735

[0072] The other - side annular groove 1736

[0073] Fan rotor 180

[0074] Fan - rotor shaft 181

[0075] Fan - rotor support bearing 190 Detailed implementation mode

[0076] Hereinafter, with reference to Figures 1 to 5 The implementation mode of the gear - drive engine of the present invention will be described. Figure 1 It is a schematic diagram showing the general structure of the gear - drive engine of the first implementation mode of the present invention. Figure 2 It is showing Figure 1 A schematic diagram of the reduction - gear system and its peripheral flexible - connection structure in the gear - drive engine shown. Figure 3 It is showing Figure 2 A schematic diagram of the state where the drum - shaped spline and the flat spline in the peripheral flexible - connection structure of the reduction - gear system shown are engaged. Figure 4 It is showing Figure 2 A schematic diagram of the state where two groups of double - row circular - arc end teeth in the peripheral flexible - connection structure of the reduction - gear system shown are engaged. Figure 5 It is showing Figure 4 A schematic diagram of the connection state between the diaphragm - disk output shaft and the planet - gear shaft in the engaged state shown.

[0077] (Overall structure of the gear - drive engine 100)

[0078] Figure 1 And Figure 2As shown, the geared turbofan engine 100 includes: an intake duct (not shown) for allowing external air to enter the engine body; a high-pressure compressor 110 for compressing and supercharging the gas entering from the intake duct into high-pressure gas; a combustion chamber (not shown) for burning the high-pressure gas flowing out from the high-pressure compressor 110 to generate high-temperature and high-pressure gas; a high-pressure turbine rotor 120 coaxially connected to the high-pressure compressor 110 and driven to rotate by the high-temperature and high-pressure gas from the combustion chamber; a low-pressure turbine rotor 130 located on the downstream side of the high-pressure turbine rotor 120 and driven to rotate by the high-temperature and high-pressure gas of the high-pressure turbine rotor 120; a low-pressure turbine rotating shaft 140 for connecting the low-pressure turbine rotor 130 to a fan rotor 180 and driving the fan rotor 180 to rotate; a gear reduction system 160 located between the low-pressure turbine rotor 130 and the fan rotor 180 and connecting the two; an input shaft 150 for inputting the rotation from the low-pressure turbine rotating shaft 140 to the gear reduction system 160; an output shaft 170 for outputting the rotation from the gear reduction system 160 to a fan rotor shaft 181 of the fan rotor 180; a fan rotor support bearing 190 for supporting the fan rotor 180; and a low-pressure turbine bearing 1A0 for supporting the low-pressure turbine rotor 130.

[0079] For the geared turbofan engine 100 configured as described above, in the initial state, an auxiliary engine (not shown) drives the high-pressure compressor to inhale high-speed and low-pressure gas from high altitude, and converts the high-speed and low-pressure gas into low-speed and high-pressure gas through the high-pressure compressor and sends it into the combustion chamber, where the gas is ignited by a spark plug (not shown) to burn and generate high-temperature and high-pressure gas. The high-temperature and high-pressure gas ejected from the combustion chamber does work to drive the high-pressure turbine rotor 120 to rotate. After the temperature and pressure of the high-temperature and high-pressure gas drop, it continues to do work to drive the low-pressure turbine rotor 130 to rotate. At this time, the rotational speed of the low-pressure turbine rotor 130 is much lower than that of the high-pressure turbine rotor 120. The rotation of the low-pressure turbine rotating shaft 140 of the low-pressure turbine rotor 130 is input to the gear reduction system 160 via the input shaft 150 for speed reduction, and then drives the fan rotor 180 to rotate via the output shaft 170. The fan rotor shaft 181 of the fan rotor 180 drives the fan blades (not shown) to rotate to eject gas towards the rear side of the fuselage, thereby providing forward thrust to the fuselage to make the aircraft fly forward.

[0080] In the gear-driven engine 100 configured as described above, the gear reduction system 160 is composed of planetary gears, which are generally composed of a sun gear 161 located at the radial center, planetary gears 162 that mesh with the sun gear 161 from the radial outside and can revolve and rotate relative to the sun gear, and a ring gear 163 that meshes with the planetary gears from the radial outside. A planet carrier (not shown) is also included in the planetary gears, and the planet carrier is connected to the planet gear shaft to output the rotation of the planetary gears.

[0081] Moreover, in the gear reduction system 160 configured as described above, the sun gear 161 is connected to the input shaft 150, the planet gear carrier (not shown) is connected to the output shaft 170, and the rotation from the low-pressure turbine rotor 130 is decelerated by the speed ratio between the input shaft 150 and the output shaft 170, thereby realizing the deceleration function of the gear system.

[0082] The input shaft 150 as described above mainly includes the following three parts:

[0083] The first part: a thin-walled short shaft 151, as shown, the thin-walled short shaft includes a short shaft body 1513, on one side of the short shaft body 1513, a one-side drum spline 1511 is formed, and on the other side, a the-other-side drum spline 1512 is formed; Figure 2 As shown, it includes a short shaft body 1513, on one side of the short shaft body 1513, a one-side drum spline 1511 is formed, and on the other side, a the-other-side drum spline 1512 is formed;

[0084] The second part: a diaphragm coupling 152, as shown, the diaphragm coupling includes a first shaft sleeve 1521 on one side, a second shaft sleeve 1522 on the other side, and an input shaft elastic diaphragm 1523 that elastically connects the first shaft sleeve 1521 and the second shaft sleeve 1522. Figure 3 As shown, it includes a first shaft sleeve 1521 on one side, a second shaft sleeve 1522 on the other side, and an input shaft elastic diaphragm 1523 that elastically connects the first shaft sleeve 1521 and the second shaft sleeve 1522.

[0085] The third part: a diaphragm-equipped input shaft 153, as shown, on one side of the diaphragm-equipped input shaft 153, a one-side flat spline 1531 is formed, and on the other side, a the-other-side flat spline 1532 is formed. Figure 2 As shown, on one side of the diaphragm-equipped input shaft 153, a one-side flat spline 1531 is formed, and on the other side, a the-other-side flat spline 1532 is formed.

[0086] In the input shaft 150 including the above first part to third part, on one side, it is meshed and connected with the low-pressure turbine rotating shaft 140 through the one-side flat spline 1531, and on the other side, it is meshed with a flat spline (not marked) formed on the sun gear 161 through the the-other-side drum spline 1512 to be connected to the sun gear 161.

[0087] Moreover, in the input shaft 150, as shown in the middle circular frame, it is meshed with the the-other-side flat spline 1532 through the one-side drum spline 1511 to form a flexible connection part for flexibly connecting the first part and the third part. Figure 2 As shown in the middle circular frame, it is meshed with the the-other-side flat spline 1532 through the one-side drum spline 1511 to form a flexible connection part for flexibly connecting the first part and the third part.

[0088] In addition, the one-side drum spline 1511, as shown Figure 3As shown, the two side surfaces thereof are designed in an involute shape, which can increase the contact area with the other side spline 1532 in the meshing direction and reduce the extrusion pressure per unit area in the meshing direction. Thus, even if vibration is transmitted to this flexible connection part, the extrusion pressure brought by the above vibration can be relieved through the involute-shaped side surface of the above one-side drum spline 1511.

[0089] In addition, although not shown in detail, Figure 2 The flexible connection part formed by the meshing of the spline of the sun gear 161 shown and the other side drum spline 1512 has the same structure and principle of action as the flexible connection part formed by the one-side drum spline 1511 and the other side spline 1532 above, so it will not be described in detail here.

[0090] In addition, as Figure 3 shown, the diaphragm coupling 152 is formed in the diaphragm input shaft 153. The first bushing 1521 therein is integrally connected to one side of the diaphragm input shaft 153, the second bushing 1522 therein is integrally connected to the other side of the diaphragm input shaft 153, and the input shaft elastic diaphragm 1523 therein elastically connects the first bushing 1521 and the second bushing 1522.

[0091] Thus, in the input shaft 150, there are a total of four flexible connection parts, namely, the flexible connection part formed by the meshing of the spline of the sun gear 161 and the other side drum spline 1512, the flexible connection part formed by the meshing of the one-side drum spline 1511 and the other side spline 1532, the flexible connection part formed by the diaphragm coupling 152, and the flexible connection part formed by the meshing of the one-side spline 1531 of the diaphragm input shaft 153 and the spline (not shown) of the low-pressure turbine rotating shaft, which can fully and gradually relieve the vibration from the gear reduction system 160, thereby achieving vibration isolation between the gear reduction system 160 and the low-pressure turbine rotor 130.

[0092] In addition, in the gear-driven engine 100 of the present invention, since a part of the input shaft 150 is set as a thin-walled short shaft 151 and drum splines with a radial dimension smaller than that of the spline are formed on both sides of the thin-walled short shaft 151, the radial dimension of the space for arranging the input shaft 150 can be reduced.

[0093] In addition, during previous high-altitude flights, impacts such as birds and floating clouds were often encountered. The impact caused the fan blades to rub against the casing of the gear-driven engine 100, thereby generating a large torque. This torque is directly applied to the gear reduction system 160 through the casing and is transmitted to the low-pressure turbine rotor 130 through the input shaft 150.

[0094] To avoid damage to the low-pressure turbine rotor 130 caused by the above-mentioned large torque, the present invention sets the strength of the first part of the input shaft 150, i.e., the thin-walled short shaft 151, to be smaller than the strength of the third part of the input shaft 150, i.e., the diaphragm-disc input shaft 153.

[0095] For example, the torque borne by the output bearing ranges from 150,000 N·m to 200,000 N·m, the reduction ratio of the gear reduction system 160 is 3:1, and the torque borne by the input bearing ranges from 50,000 N·m to 66,700 N·m.

[0096] Within the above range, the strength of the thin-walled short shaft 151 is set to be smaller than the strength of the diaphragm-disc coupling 152, preferably small enough that the drum-shaped spline flexible connection part between the thin-walled short shaft 151 and the diaphragm-disc coupling 152 breaks but the diaphragm-disc coupling 152 does not break.

[0097] In this way, when a large torque is applied to the gear reduction system 160 and transmitted via the input shaft 150, causing the drum-shaped spline 1511 on one side of the thin-walled short shaft 151 to break from the flat spline 1532 on the other side of the diaphragm coupling 152, the diaphragm coupling 152 and the low-pressure turbine rotor 130 connected thereto can be protected from breaking.

[0098] On the other hand, as Figure 4 shown, the output shaft 170 as described above mainly includes the following three parts:

[0099] The first part: the planetary gear shaft 171, one side of the planetary gear shaft 171 is connected to the planetary gear 162, and the other side is connected to the diaphragm-disc output shaft 173 as Figure 2 shown, specifically formed with planetary gear double-row circular arc end teeth 1711 and planetary gear annular grooves 1712 as Figure 5 shown;

[0100] The second part: the diaphragm-disc output shaft 173, the diaphragm-disc output shaft as Figure 5 shown forms one-side double-row circular arc end teeth 1731 on one side corresponding to the planetary gear double-row circular arc end teeth 1711, and forms one-side annular grooves 1732 on one side corresponding to the planetary gear annular grooves 1712. One-side bolts 1733 respectively penetrate through the one-side annular grooves 1732 and the planetary gear annular grooves 1712 and are fixed by one-side nuts 1734. In this way, they are fastened by the meshing of the double-row circular arc end teeth 1731 and the double-row circular arc end teeth 1711 and by the one-side bolts 1733.

[0101] The third part: the diaphragm coupling 172, the diaphragm coupling as Figure 2 and Figure 4It includes: a third bushing 1721, which is integrally connected to one side of the film disk output shaft 173; a fourth bushing 1722, which is integrally connected to the other side of the film disk output shaft 173; and an output shaft elastic diaphragm 1723, which elastically connects the third bushing 1721 and the fourth bushing 1722.

[0102] In the output shaft 170 configured as described above, as Figure 4 shown, the double-row circular arc end teeth 1731 on one side of the film disk output shaft 173 mesh with the double-row circular arc end teeth 1711 of the planet gear shaft 171, and as Figure 5 shown, the one-side annular groove bolts 1733 are respectively penetrated and inserted into the one-side annular groove 1732 and the planet gear annular groove 1712, and are screwed and fastened with the one-side nuts 1734 to achieve a flexible connection between the film disk output shaft 173 and the planet gear shaft 171.

[0103] In addition, the diaphragm coupling 172 is connected to the third bushing 1721 and the fourth bushing 1722 through the output shaft elastic diaphragm 1723 as described above to form a flexible connection structure.

[0104] On this basis, as Figure 2 shown, on the other side of the fourth bushing 1722, there are also formed a double-row circular arc end teeth 1735 and an other-side annular groove 1736 on the other side. Although not clearly marked, the fan rotor shaft 181 of the fan rotor 180 also correspondingly forms double-row circular arc end teeth and an annular groove, and bolts (not shown) are penetrated and inserted into the other-side annular groove 1736 and the annular groove of the fan rotor 180, and are screwed with nuts (not shown) to flexibly connect the diaphragm coupling 172 and the fan rotor 180.

[0105] In this way, by arranging the above three flexible connection parts in the output shaft 170, the vibration transmitted from the gear reduction system 160 to the fan rotor 180 can be fully alleviated, so as to achieve vibration isolation between the gear reduction system 160 and the fan rotor 180.

[0106] In addition, the rotational speed of the input shaft is reduced via the gear reduction system 160, that is, the rotational speed of the output shaft is less than the rotational speed of the output shaft. Therefore, when the power from the high-temperature and high-pressure gas is constant, based on the formula power = 2π * torque * rotational speed, the torque (or torsion) of the output shaft is greater than the torque of the input shaft. That is to say, the torque that the output shaft has to bear becomes larger.

[0107] In this regard, since double-row circular arc end teeth are provided on both sides of the film disk output shaft 173 as described above, the double-row circular arc end teeth can bear a greater torque, so as to improve the load-bearing capacity of the output shaft.

[0108] When the geared engine 100 including the above-mentioned input shaft 150 and output shaft 170 is operating, vibrations may occur between the various gears during the operation of the gear reduction system 160 itself. Such vibrations may cause tooth friction wear, shaft bending deformation, or component damage between the low-pressure turbine rotating shaft 140 and the fan rotor shaft 181. Moreover, radial displacement, axial displacement, angular displacement, or a combined displacement composed of the above displacements may occur between any two connected shafts between the low-pressure turbine rotating shaft 140 and the fan rotor shaft 181, resulting in a misalignment state.

[0109] In addition, when the aircraft maneuvers at high altitude, a gyroscopic moment is often generated on the gear reduction system 160. The vibrations generated by the gyroscopic moment on the gear reduction system 160 are also transmitted to the low-pressure turbine rotating shaft 140 via the input shaft 150 and to the fan rotor shaft 181 via the output shaft 170 respectively. Therefore, this vibration may also overlap with the above-mentioned vibration, thus exacerbating tooth friction wear, shaft bending deformation, or component damage between the low-pressure turbine rotating shaft 140 and the fan rotor shaft 181. Moreover, it may exacerbate radial displacement, axial displacement, angular displacement, or a combined displacement composed of the above displacements between any two connected shafts between the low-pressure turbine rotating shaft 140 and the fan rotor shaft 181, which may lead to Figure 2 a serious misalignment state between any two shafts between the low-pressure turbine bearing 1A0 for supporting the low-pressure turbine rotating shaft 140 and the fan rotor support bearing 190 for supporting the fan rotor shaft 181 as shown, for example, between the low-pressure turbine rotating shaft 140 and the diaphragm input shaft 153, between the diaphragm input shaft 153 and the thin-walled short shaft 151, between the thin-walled short shaft 151 and the shaft of the sun gear 160, between the planet gear shaft 171 and the diaphragm output shaft 173, and between the diaphragm output shaft 173 and the fan rotor shaft 181.

[0110] To mitigate the above two vibrations and compensate for the alignment state caused by the above two vibrations, in addition to providing a flexible connection portion formed by the engagement of the one-sided drum spline 1511 and the other-sided flat spline 1532 in the input shaft 150 as described above to absorb the above vibrations, the gear-driven engine 100 of the present invention also has a diaphragm coupling 152 provided in the input shaft 150 and a diaphragm coupling 172 provided in the output shaft 170. The radial displacement, axial displacement, angular displacement, or the combined displacement formed by the above displacements generated between any two connected shafts between the low-pressure turbine rotating shaft 140 and the fan rotor shaft 181 is absorbed through the input shaft elastic diaphragm 1523 of the diaphragm coupling 152 and the output shaft elastic diaphragm 1723 of the diaphragm coupling 172, thereby compensating for the misalignment states generated between the low-pressure turbine rotating shaft 140 and the diaphragm input shaft 153, between the diaphragm input shaft 153 and the thin-walled short shaft 151, between the thin-walled short shaft 151 and the shaft of the sun gear 160, between the planetary gear shaft 171 and the diaphragm output shaft 173, and between the diaphragm output shaft 173 and the fan rotor shaft 181.

[0111] In addition, by providing double-row circular arc end teeth at both ends of the diaphragm output shaft 173 of the output shaft 170 to form a flexible connection portion including double-row circular arc end teeth between the gear reduction system 160 and the fan rotor 180, the load-bearing capacity of the output shaft 170 can be improved and the above two vibrations can be appropriately absorbed.

[0112] Above, in order to make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, in combination with the Figures 1 to 5 The technical solutions of the embodiments of the present invention have been clearly and completely described. Obviously, the described embodiments are part of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts fall within the scope of the present invention to be protected.

[0113] In the above embodiment, the flexible connection structure composed of the drum spline and the diaphragm coupling is only provided in the input shaft, but the present invention is not limited thereto and can also be provided in the output shaft.

[0114] In the above embodiment, the flexible connection structure composed of the double-row circular arc end teeth with annular grooves and the diaphragm coupling is only provided in the output shaft, but the present invention is not limited thereto and can also be provided in the input shaft.

[0115] In the above embodiment, only one diaphragm coupling is provided in the output shaft, but the present invention is not limited thereto and multiple diaphragm couplings can also be provided.

[0116] In the above-described embodiment, drum-shaped splines are formed at both ends of the input shaft, but the present invention is not limited thereto, and drum-shaped splines may also be formed at only one end.

[0117] In the above-described embodiment, double-row circular-arc end teeth are formed at both ends of the output shaft, but the present invention is not limited thereto, and double-row circular-arc end teeth may also be formed at only one end.

[0118] In the above-described embodiment, a gear reduction system is exemplified as the gear transmission system, but the present invention is not limited thereto, and it may also be other types of gear transmission systems.

[0119] In the above-described embodiment, the gear reduction system is exemplified as being composed of planetary gears, but the present invention is not limited thereto, and it may also be composed of other types of gears.

Claims

1. A flexible connection structure for a gear transmission system, characterized in that, it includes an input shaft, and the input shaft connects the turbine system to the gear transmission system, the input shaft includes: a thin-walled short shaft, and the thin-walled short shaft is formed with drum-shaped splines at both ends; and a diaphragm input shaft, and the diaphragm input shaft is formed with flat splines at both ends, the thin-walled short shaft and the diaphragm input shaft are connected to each other in such a way that the drum-shaped splines are engaged with the flat splines.

2. The flexible connection structure for a gear transmission system according to claim 1, characterized in that, the diaphragm input shaft further includes an input shaft diaphragm coupling, the input shaft diaphragm coupling includes: a first shaft sleeve, and the first shaft sleeve is integrally connected to one side of the diaphragm input shaft; a second shaft sleeve, and the second shaft sleeve is integrally connected to the other side of the diaphragm input shaft; and an input shaft elastic diaphragm, and the input shaft elastic diaphragm elastically connects the first shaft sleeve and the second shaft sleeve.

3. The flexible connection structure for a gear transmission system according to claim 1 or 2, characterized in that, it further includes an output shaft, and the output shaft includes: a gear output shaft, and the gear output shaft extends from the gear transmission system and forms first double-row circular arc end teeth on the other side; and a diaphragm output shaft, and the diaphragm output shaft is formed with second double-row circular arc end teeth at both ends, the gear output shaft and the diaphragm output shaft are connected to each other in such a way that the first double-row circular arc end teeth are engaged with the second double-row circular arc end teeth.

4. The flexible connection structure for a gear transmission system according to claim 3, characterized in that, the diaphragm output shaft further includes an output shaft diaphragm coupling, the output shaft diaphragm coupling includes: a third shaft sleeve, and the third shaft sleeve is integrally connected to one side of the diaphragm output shaft; a fourth shaft sleeve, and the fourth shaft sleeve is integrally connected to the other side of the diaphragm output shaft; and an output shaft elastic diaphragm, and the output shaft elastic diaphragm elastically connects the third shaft sleeve and the fourth shaft sleeve.

5. The flexible connection structure for a gear transmission system according to claim 3, and the gear transmission system is a planetary gear system, including: a sun gear located at the center; planet gears that mesh with the sun gear from the radial outside and can revolve and rotate relative to the sun gear; and a ring gear that meshes with the planet gears from the radial outside, characterized in that, the diaphragm input shaft is connected to the sun gear, the diaphragm output shaft is connected to the planet gear.

6. The flexible connection structure for a gear transmission system according to claim 4, and the gear transmission system is a planetary gear system, including: a sun gear located at the center; planet gears that mesh with the sun gear from the radial outside and can revolve and rotate relative to the sun gear; and a ring gear that meshes with the planet gears from the radial outside, characterized in that, the diaphragm input shaft is connected to the sun gear, the diaphragm output shaft is connected to the planet gear.

7. The flexible connection structure for a gear transmission system according to any one of claims 1, 2, 4 to 6, characterized in that, the strength of the thin-walled short shaft is less than the strength of the diaphragm input shaft.

8. The flexible connection structure of the gear transmission system according to claim 3, characterized in that, the strength of the thin-walled short shaft is less than the strength of the diaphragm disc input shaft.

9. A gear-driven engine, characterized in that, comprising: a gear transmission system; the flexible connection structure of the gear transmission system according to any one of claims 1 to 8; a turbine system, the turbine system being connected to the gear transmission system from the input side via the flexible connection structure; and a fan rotor system; the fan rotor system being connected to the gear transmission system from the output side via the flexible connection structure.

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