A disc shaft connecting structure, an engine rotor and an aero-engine

Abstract

The application discloses a disc-shaft connecting structure, an engine rotor and an aero-engine, wherein the disc-shaft connecting structure comprises a connecting disc and a connecting shaft, the connecting disc is provided with a shaft neck in the middle of the axial one end, and a central hole is formed in the connecting disc and the shaft neck along the axial direction; an outer spline part is arranged on the outer circumferential wall of the shaft neck along the circumferential direction, and a guide positioning member is arranged on the outer circumferential wall of the shaft neck between two adjacent outer spline teeth of the outer spline part; an inner spline part matched with the outer spline part is arranged on the inner circumferential wall of the connecting shaft along the circumferential direction; a guide positioning groove is arranged on the inner circumferential wall of the connecting shaft corresponding to the guide positioning member, the guide positioning groove penetrates the connecting shaft along the axial direction and is matched with the guide positioning member. The application ensures the uniqueness of the circumferential matching position between the inner spline part and the outer spline part, and improves the efficiency of the engine rotor provided with the disc-shaft connecting structure after disassembly and reassembly.

Description

Technical Field

[0001] This invention relates to the field of aero-engine technology, specifically to a disc-shaft connection structure, an engine rotor, and an aero-engine. Background Technology

[0002] The turbine rotor system of an aero-engine operates in a high-temperature, high-pressure environment. Simultaneously, the turbine rotor is heavy, has a large moment of inertia, and operates at speeds exceeding 10,000 rpm, resulting in extremely high loads. The disc-shaft connection structure is a crucial component of the rotor system, directly impacting the rotor's stability and reliability during operation.

[0003] The disc-shaft connection structure typically includes a connecting disc and a connecting shaft. The connecting shaft and the connecting disc are axially locked together to form a whole. Torque is transmitted between the connecting shaft and the connecting disc through the meshing of the internal and external splines. This allows the torque on the connecting disc to be transmitted to the connecting shaft, and then to the compressor, accessory drive device, and propeller, thus completing the torque transmission.

[0004] However, the circumferential fit between the inner and outer splines in the existing disc-shaft connection structure is not fixed during the assembly process, and the rotor dynamic characteristics are uncertain after assembly. Each time the disc-shaft connection structure is disassembled, inspected and reassembled, the rotor needs to be re-balanced to ensure that the rotor dynamic characteristics are qualified, resulting in low assembly efficiency. Summary of the Invention

[0005] Therefore, the technical problem to be solved by the present invention is to overcome the defects of the prior art in which the circumferential fit position between the inner spline and the outer spline is not fixed when the disc shaft connection structure in the aero-engine rotor is disassembled and reassembled, and the rotor needs to be re-dynamically balanced to ensure the rotor dynamic characteristics after each disassembly, inspection and reassembly of the disc shaft connection structure, resulting in low assembly efficiency. The present invention provides a disc shaft connection structure, an engine rotor and an aero-engine.

[0006] According to a first aspect of the present invention, a disc-shaft connection structure includes:

[0007] The connecting disc has a journal protruding from the middle of one end along the axial direction, and a central hole is formed through the connecting disc and the journal along the axial direction;

[0008] An external spline portion is circumferentially disposed on the outer peripheral wall of the journal, and a guide positioning element is protruding on the outer peripheral wall of the journal at a position between one set of two adjacent external spline teeth of the external spline portion;

[0009] The connecting shaft has an inner spline portion circumferentially arranged on the inner peripheral wall of one end facing the journal, which matches the outer spline portion; the inner peripheral wall of the connecting shaft has a guide positioning groove recessed at the position of the guide positioning member, and the guide positioning groove extends axially through the connecting shaft at one end facing the journal and matches the guide positioning member.

[0010] According to the disc shaft connection structure of the present invention, at least the following technical effects are achieved:

[0011] A guide positioning element is provided on the outer peripheral wall of the journal, between two adjacent external key teeth in the external spline portion. A guide positioning groove matching the guide positioning element is recessed on the inner peripheral wall of the connecting shaft. The sliding fit between the guide positioning groove and the guide positioning element determines the unique assembly direction of the connecting disc and the connecting shaft, ensuring the uniqueness of the circumferential fit position between the inner and outer splines. This ensures that the circumferential assembly position of the inner and outer splines of the disc-shaft connection structure remains unchanged before disassembly and after disassembly and reassembly, thereby guaranteeing the uniqueness of the circumferential assembly position of the engine rotor equipped with this disc-shaft connection structure. This design avoids the need for frequent dynamic balancing tests on engine rotors equipped with this disc-shaft connection structure. Specifically, it eliminates the need to re-balance the engine rotor after each disassembly, inspection, and reassembly of the disc-shaft connection structure to ensure its dynamic characteristics meet requirements. This improves the efficiency of disassembly, inspection, and reassembly of engine rotors equipped with this disc-shaft connection structure. Furthermore, since no balancing equipment is required for dynamic balancing tests during disassembly and reassembly, the requirements for daily maintenance equipment and conditions for aero-engines equipped with this disc-shaft connection structure are reduced.

[0012] Preferably, it further includes an axial locking assembly for axially connecting and locking the connecting disc and the connecting shaft into a whole.

[0013] Preferably, the connecting shaft has a connecting portion, the axial projection of the journal falls within the range of the connecting portion, and the connecting portion has an internal threaded hole in its end face facing the journal along the axial direction; the axial locking assembly includes a locking member that is movably inserted into the central hole, and the locking member has an external threaded portion on its outer peripheral wall at one end facing the connecting portion along the axial direction, the external threaded portion matching the internal threaded hole; the locking member has a limiting portion that protrudes radially on its outer peripheral wall facing away from the connecting portion along the axial direction, and the outer diameter of the limiting portion is larger than the inner diameter of the central hole.

[0014] Preferably, when the external threaded portion is assembled with the internal threaded hole, the locking member and the internal threaded hole are arranged at intervals along the axial direction to form an oil groove; a through hole is formed on the locking member along the axial direction, and the through hole communicates with the oil groove;

[0015] And / or, the inner wall of the central hole is provided with a partition seat protruding radially toward the center of the central hole, and the middle part of the partition seat is formed with a through hole through the axial direction, the through hole allowing the locking member to move through, the partition seat dividing the central hole into a first hole and a second hole along the axial direction, the first hole being located at the end of the second hole away from the connecting shaft, the outer diameter of the limiting part being larger than the diameter of the through hole and smaller than the diameter of the first hole; when the disc shaft connecting structure is in the assembled state, the limiting part and the two end faces of the partition seat facing each other along the axial direction abut against each other, and the limiting part is located in the first hole.

[0016] Preferably, the locking member has a guide groove recessed on the outer peripheral wall of one end facing the connecting part along the axial direction. The guide groove passes through the external threaded part along the axial direction and communicates with the oil groove.

[0017] Preferably, the depth of the guide groove is not less than the thread depth of the external thread portion;

[0018] And / or, two flow channels are provided, and the two flow channels are arranged symmetrically about the axis of the locking member.

[0019] Preferably, a plurality of fastening grooves are provided on the outer side wall of the limiting part at intervals along the circumference of the limiting part; deformable cup-shaped locking pieces corresponding one-to-one with the fastening grooves are arranged at intervals along the circumference of the limiting part on the inner wall of the through hole; during assembly, the cup-shaped locking pieces are flipped and locked into the fastening grooves along the radial direction of the limiting part toward the center of the limiting part.

[0020] Preferably, the inner wall of the through hole is provided with positioning grooves that correspond one-to-one with the cup-shaped locking pieces along the circumferential direction of the limiting part, and the cup-shaped locking pieces can be detachably inserted into the positioning grooves at one end facing the connecting shaft along the axial direction.

[0021] An engine rotor according to a second aspect of the present invention includes the disc-shaft connection structure provided in the first aspect above.

[0022] An engine rotor according to the present invention has at least the following technical effects:

[0023] A guide positioning element is protruding on the outer peripheral wall of the journal in the disc-shaft connection structure, located between two adjacent external key teeth in the external spline portion. A guide positioning groove matching the guide positioning element is recessed on the inner peripheral wall of the connecting shaft. The sliding fit between the guide positioning groove and the guide positioning element determines the directionality of the connecting shaft when assembled onto the connecting disc, ensuring the uniqueness of the circumferential fit position between the inner and outer splines. This ensures that the circumferential assembly position of the inner and outer splines in the disc-shaft connection structure of the engine rotor remains unchanged before disassembly and after disassembly and reassembly. This design ensures the uniqueness of the circumferential assembly position of the engine rotor, avoiding frequent dynamic balancing tests. Specifically, it eliminates the need to re-balance the engine rotor after each disassembly, inspection, and reassembly of the rotor's disc-shaft connection structure to ensure its dynamic characteristics meet requirements. This improves the efficiency of disassembly, inspection, and reassembly. Furthermore, since no balancing equipment is needed for dynamic balancing tests during disassembly and reassembly, it reduces the requirements for daily maintenance equipment and conditions for aircraft engines equipped with this rotor.

[0024] According to a third aspect of the present invention, an aircraft engine includes the disc-shaft connection structure provided in the first aspect above.

[0025] An aircraft engine according to the present invention has at least the following technical effects:

[0026] By providing a guide positioning element protruding from the outer peripheral wall of the journal in the disc-shaft connection structure, located between two adjacent external key teeth in the external spline portion, and by providing a guide positioning groove matching the guide positioning element in the inner peripheral wall of the connecting shaft, the sliding fit between the guide positioning groove and the guide positioning element determines the unique assembly direction of the connecting disc and the connecting shaft. This ensures the uniqueness of the circumferential fit position between the inner and outer splines, guaranteeing that the circumferential assembly position of the inner and outer splines of the disc-shaft connection structure remains unchanged before disassembly and after disassembly and reassembly. This, in turn, ensures the optimal performance of this aero-engine. The unique circumferential assembly position of the engine rotor avoids frequent dynamic balancing tests on the engine rotor of this aero-engine. That is, it is not necessary to re-perform dynamic balancing tests on the engine rotor after each disassembly, inspection, and reassembly of the disc-shaft connection structure of this aero-engine to ensure that the dynamic characteristics of the engine rotor are qualified. This improves the efficiency of disassembly, inspection, and reassembly of the engine rotor of this aero-engine. At the same time, since no balancing equipment is needed for dynamic balancing tests when the engine rotor of this aero-engine is disassembled and reassembled, the requirements for daily maintenance equipment and maintenance conditions of this aero-engine can be reduced.

[0027] Additional aspects and advantages of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0028] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0029] Figure 1 This is a schematic diagram of a disc shaft connection structure according to an embodiment of the present invention;

[0030] Figure 2 for Figure 1 Schematic diagram of the cross-sectional structure at point AA;

[0031] Figure 3 for Figure 1 Schematic diagram of the cross-sectional structure at point BB;

[0032] Figure 4 This is a schematic diagram of the locking element in a disc shaft connection structure according to an embodiment of the present invention;

[0033] Figure 5 This is a partial structural diagram of the connecting shaft in a disc-shaft connection structure according to an embodiment of the present invention;

[0034] Figure 6 This is a partial structural diagram of the connecting disk in a disk-shaft connection structure according to an embodiment of the present invention.

[0035] Explanation of reference numerals in the attached figures:

[0036] 1-Connecting disc, 11-Jirder, 12-Center hole, 121-First hole, 122-Second hole, 13-External spline, 131-Guide positioning element, 14-Separator seat, 141-Positioning groove;

[0037] 2-Connecting shaft, 21-Inner spline part, 211-Guide positioning groove, 22-Connecting part, 23-Oil groove;

[0038] 31-Locking part, 311-External thread part, 312-Limiting part, 313-Through hole, 314-Guide groove, 315-Fastening groove, 316-Internal hexagonal hole, 32-Cup-shaped locking piece. Detailed Implementation

[0039] The technical solution of the present invention will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0040] In the description of this invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this invention and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0041] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0042] Furthermore, the technical features involved in the different embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0043] Example 1

[0044] like Figures 1 to 6 The diagram illustrates a disc-shaft connection structure provided in this embodiment, comprising a connecting disc 1 and a connecting shaft 2. A journal 11 protrudes from the center of one end of the connecting disc 1 along the axial direction. A central hole 12 is formed through the connecting disc 1 and the journal 11 along the axial direction. An external spline portion 13 is circumferentially arranged on the outer peripheral wall of the journal 11. A guide positioning member 131 protrudes from the outer peripheral wall of the journal 11 at a position between two adjacent external spline teeth of the external spline portion 13. An internal spline portion 21 is circumferentially arranged on the inner peripheral wall of the connecting shaft 2 at the end facing the journal 11 along the axial direction. The internal spline portion 21 matches the external spline portion 13. A guide positioning groove 211 is recessed on the inner peripheral wall of the connecting shaft 2 at a position corresponding to the guide positioning member 131. The guide positioning groove 211 penetrates the connecting shaft 2 axially at the end facing the journal 11 and matches the guide positioning member 131. It is understood that the axial direction mentioned in this embodiment refers to... Figure 1 The axial direction is shown in the figure.

[0045] In this embodiment, the disc-shaft connection structure has a guide positioning member 131 protruding on the outer peripheral wall of the journal 11 between two adjacent external key teeth of the outer spline portion 13, and a guide positioning groove 211 matching the guide positioning member 131 is recessed on the inner peripheral wall of the connecting shaft 2. The sliding fit between the guide positioning groove 211 and the guide positioning member 131 determines the unique assembly direction of the connecting disc 1 and the connecting shaft 2, ensuring the uniqueness of the circumferential fit position between the inner spline portion 21 and the outer spline portion 13. This ensures that the circumferential assembly position of the inner spline portion 21 and the outer spline portion 13 of the disc-shaft connection structure of this embodiment remains consistent before disassembly and after disassembly, inspection, and reassembly, thereby ensuring the smooth operation of the engine equipped with the disc-shaft connection structure of this embodiment. The uniqueness of the circumferential assembly position of the engine rotor avoids frequent dynamic balancing tests on the engine rotor equipped with the disc-shaft connection structure of this embodiment. That is, it is not necessary to re-perform dynamic balancing tests on the engine rotor equipped with the disc-shaft connection structure of this embodiment after each disassembly, inspection and reassembly to ensure that the dynamic characteristics of the engine rotor are qualified. This improves the efficiency of disassembly, inspection and reassembly of the engine rotor equipped with the disc-shaft connection structure of this embodiment. At the same time, since the engine rotor equipped with the disc-shaft connection structure of this embodiment does not require dynamic balancing tests using balancing equipment when disassembling and reassembling, it can reduce the requirements for daily maintenance equipment and maintenance conditions of the aero-engine equipped with the disc-shaft connection structure of this embodiment.

[0046] It should be noted that the disc-shaft connection structure in this embodiment of the invention is used to connect the connecting disc 1 and the connecting shaft 2. For example, in one embodiment, the connecting shaft 2 can be a turbine shaft of an aircraft engine, and the connecting disc 1 can be a turbine disk of an aircraft engine. Of course, this invention does not limit the types of the connecting disc 1 and the connecting shaft 2. In other embodiments, the connecting disc 1 and the connecting shaft 2 can also be other components from other fields, which will not be listed here.

[0047] like Figure 5 and Figure 6As shown, specifically, in the process of machining the outer spline portion 13 on the outer peripheral wall of the journal 11, the machining of one of the outer key teeth of the outer spline portion 13 is omitted to obtain the guide positioning component 131; in the process of machining the inner spline portion 21 on the inner peripheral wall of the connecting shaft 2, the inner key tooth groove corresponding to the position of the guide positioning component 131 is enlarged to obtain the guide positioning groove 211. By replacing one of the outer key teeth of the outer spline portion 13 and one of the inner key tooth grooves of the inner spline portion 21 with the guide positioning component 131 and the guide positioning groove 211 respectively, the uniqueness of the circumferential mating position between the inner spline portion 21 and the outer spline portion 13 is ensured while reducing the strength weakening of the outer spline portion 13 and the inner spline portion 21; and compared with machining the entire circle of the outer spline portion 13 and the inner spline portion 21, the machining process of the disc shaft connection structure in this embodiment remains basically unchanged, without significantly increasing the machining cost, facilitating mass production, and improving market competitiveness.

[0048] In some embodiments of the present invention, the disc-shaft connection structure further includes an axial locking assembly, which is used to axially connect and lock the connecting disc 1 and the connecting shaft 2 into a whole. The axial locking assembly can restrict the axial movement of the connecting shaft 2 relative to the connecting disc 1, ensuring the meshing area of ​​the outer spline portion 13 and the inner spline portion 21, and ensuring that the engine rotor equipped with the disc-shaft connection structure of this embodiment operates smoothly and without abnormal noise at operating speeds of 10,000 rpm or higher.

[0049] like Figure 1 , Figure 4 and Figure 5As shown, in some embodiments of the present invention, a connecting portion 22 is provided inside the connecting shaft 2, the axial projection of the journal 11 falls within the range of the connecting portion 22, and an internal threaded hole is provided in the end face of the connecting portion 22 facing the journal 11 along the axial direction; the axial locking assembly includes a locking member 31 that is movably inserted into the central hole 12, and an external threaded portion 311 is provided on the outer peripheral wall of one end of the locking member 31 facing the connecting portion 22 along the axial direction, the external threaded portion 311 matching the internal threaded hole; a limiting portion 312 is radially protruding on the outer peripheral wall of the locking member 31 facing away from the connecting portion 22 along the axial direction, and the outer diameter of the limiting portion 312 is larger than the inner diameter of the central hole 12. Because the inner peripheral wall of the connecting shaft 2 is connected to the outer peripheral wall of the journal 11 through the meshing of the inner spline portion 21 and the outer spline portion 13 to transmit torque, and a connecting portion 22 is provided inside the connecting shaft 2, after the outer thread portion 311 of the locking member 31 is screwed into place with the inner thread hole, it can be ensured that the limiting portion 312 abuts against the end face of the journal 11 that is axially away from the connecting disc 1, based on the connecting portion 22 abutting against the end face of the connecting disc 1 that is axially away from the journal 11. Thus, the degree of freedom of the connecting shaft 2 relative to the connecting disc 1 in the axial direction is restricted based on the fact that most of the locking member 31 is hidden and embedded in the center hole 12, ensuring that the engine rotor equipped with the disc shaft connection structure of this embodiment can work smoothly and without abnormal noise under high speed operation.

[0050] like Figure 1 and Figure 4 As shown, specifically, when the external threaded portion 311 is assembled with the internal threaded hole, the locking member 31 and the internal threaded hole are arranged at intervals along the axial direction to form an oil groove 23; a through hole 313 is formed through the locking member 31 along the axial direction, and the through hole 313 communicates with the oil groove 23. When the disc shaft connection structure of this embodiment needs to be disassembled and inspected, the penetrating liquid for lubrication can be injected into the oil groove 23 through the central hole 12, and after the penetrating liquid fills the oil groove 23, it gradually penetrates into the thread gap between the external threaded portion 311 and the internal threaded hole to soak and lubricate the threads, making the threads easy to disassemble and not easily damaged after long-term use. This ensures that the disc shaft connection structure of this embodiment can still maintain high-strength connection performance after disassembly, inspection and reassembly, thereby ensuring that the aircraft engine rotor equipped with the disc shaft connection structure of this embodiment still meets the requirements of special working environments after multiple disassembly, inspection and reassembly.

[0051] like Figure 1 and Figure 4As shown, specifically, the locking member 31 has a guide groove 314 recessed on the outer peripheral wall of one end facing the connecting part 22 along the axial direction. The guide groove 314 passes through the external thread part 311 along the axial direction and communicates with the oil groove 23. The guide groove 314 allows the penetrating liquid filled in the oil groove 23 to better penetrate into the thread gap between the external thread part 311 and the internal thread hole, ensuring that the penetrating liquid fully soaks the threads. This ensures that the threads are not damaged while making it easy to disassemble the threads used for a long time, and thus ensures that the high-strength thread connection performance can still be guaranteed after the disc shaft connection structure of this embodiment is disassembled, inspected and reassembled.

[0052] To allow the penetrating fluid to penetrate more smoothly into the thread gap between the external thread 311 and the internal thread hole, and to provide more thorough immersion and lubrication to the threads, such as... Figure 3 As shown, more specifically, the depth of the guide groove 314 is not less than the thread depth of the external thread portion 311, and preferably the depth of the guide groove 314 is equal to the thread depth of the external thread portion 311.

[0053] like Figure 3 and Figure 4 As shown, in some embodiments of the present invention, two guide grooves 314 are provided, and the two guide grooves 314 are symmetrically arranged about the axis of the locking member 31. By setting the cross-sectional shape of the locking member 31 perpendicular to the axial direction as a centrally symmetrical figure, the static balance performance of the locking member 31 can be better ensured, the thread connection strength between the external thread portion 311 and the internal thread hole can be guaranteed, and the penetrating liquid can be made to penetrate more smoothly into the thread gap between the external thread portion 311 and the internal thread hole, ensuring that the penetrating liquid fully soaks the threads, thereby ensuring that the threads are not damaged while making it easy to disassemble the threads used for a long time.

[0054] like Figure 1 and Figure 6As shown, in some embodiments of the present invention, a partition seat 14 is provided on the inner wall of the central hole 12 radially toward the center of the central hole 12. A through hole is formed in the middle of the partition seat 14 along the axial direction, through which the locking member 31 moves. The partition seat 14 divides the central hole 12 into a first hole 121 and a second hole 122 along the axial direction. The first hole 121 is located at the end of the second hole 122 away from the connecting shaft 2. The outer diameter of the limiting part 312 is larger than the diameter of the through hole and smaller than the diameter of the first hole 121. When the disc shaft connection structure is in the assembled state, the limiting part 312 abuts against the two end faces of the partition seat 14 that face each other along the axial direction, and the limiting part 312 is located in the first hole 121. Compared to arranging the short bolts and locking plates that connect the axial locking disc 1 and the connecting shaft 2 outside the connecting disc 1, which requires a special convex shaft portion to be designed on the end face of the connecting disc 1 for assembly with the short bolts and locking plates, in this embodiment, the locking member 31 and the limiting part 312 are both hidden and embedded in the central hole 12, so that the assembly position of the locking member 31 and the limiting part 312 with the connecting disc 1 is located in the central hole 12. There is no need to axially protrude a shaft portion on the end face of the connecting disc 1 for the assembly and installation of the locking member 31 and the limiting part 312, thereby shortening the axial length of the disc-shaft connection structure of this embodiment, and further shortening the axial length of the rotor of the aero-engine equipped with this embodiment. This is beneficial to the overall optimized layout of the aero-engine, enabling the aero-engine to adapt to more usage scenarios, especially suitable for assembly in narrow installation spaces with short axial dimensions.

[0055] like Figure 1 As shown, specifically, the locking member 31 has an internal hexagonal hole 316 on its end face axially away from the connecting shaft 2, so that an internal hexagonal wrench can be inserted into the internal hexagonal hole 316 to rotate the locking member 31 within the relatively narrow central hole 12 to tighten the external thread 311 with the internal thread hole, making disassembly and assembly convenient. More specifically, the internal hexagonal hole 316 communicates with the through hole 313.

[0056] like Figure 1 and Figure 4As shown, in some embodiments of the present invention, a plurality of fastening grooves 315 are provided on the outer side wall of the limiting part 312 at intervals along the circumference of the limiting part 312, preferably three fastening grooves 315; the inner wall of the through hole is provided with deformable cup-shaped locking pieces 32 corresponding one-to-one with the fastening grooves 315 at intervals along the circumference of the limiting part 312; during assembly, the cup-shaped locking pieces 32 are flipped and locked in the fastening grooves 315 along the radial direction of the limiting part 312 toward the center of the limiting part 312 to form an integral installation structure, which can effectively prevent the locking member 31 from rotating circumferentially relative to the connecting disc 1 during the transmission of torque in the disc shaft connection structure of this embodiment, ensuring the tightness of the connection between the external thread part 311 and the internal thread hole; and can also improve the friction performance between the contact surfaces of the limiting part 312 and the first hole 121 along the axial direction.

[0057] like Figure 1 and Figure 6 As shown, in some embodiments of the present invention, the inner wall of the through hole is provided with positioning grooves 141 corresponding to the cup-shaped locking pieces 32 at intervals along the circumference of the limiting portion 312. The cup-shaped locking pieces 32 are detachably inserted into the positioning grooves 141 at one end facing the connecting shaft 2 along the axial direction. By detachably connecting the cup-shaped locking pieces 32 to the positioning grooves 141 in an insert manner, when the cup-shaped locking pieces 32 are damaged and cannot perform the fastening function properly after multiple disassembly, inspection and reassembly, it is easy to remove and replace the damaged cup-shaped locking pieces 32, resulting in low maintenance cost and convenient maintenance.

[0058] Example 2

[0059] like Figures 1 to 6The image shows an engine rotor provided in this embodiment, including the disc-shaft connection structure described in Embodiment 1. In this embodiment, the engine rotor has a guide positioning member 131 protruding on the outer peripheral wall of the journal 11 in the disc-shaft connection structure, located between two adjacent sets of external key teeth of the external spline portion 13. A guide positioning groove 211 matching the guide positioning member 131 is recessed on the inner peripheral wall of the connecting shaft 2. The sliding fit between the guide positioning groove 211 and the guide positioning member 131 determines the directionality of the connecting shaft 2 when assembled onto the connecting disc 1, ensuring the uniqueness of the circumferential fit position between the inner spline portion 21 and the outer spline portion 13. This ensures that the circumferential assembly position of the inner spline portion 21 and the outer spline portion 13 in the disc-shaft connection structure of the engine rotor of this embodiment is consistent before and after disassembly. The reassembly process remained unchanged, ensuring the uniqueness of the circumferential assembly position of the engine rotor in this embodiment. This avoids frequent dynamic balancing tests on the engine rotor, meaning that it is not necessary to re-perform dynamic balancing tests on the engine rotor after each disassembly, inspection, and reassembly of the rotor's disc-shaft connection structure to ensure the engine rotor's dynamic characteristics meet the requirements. This improves the efficiency of disassembly, inspection, and reassembly of the engine rotor in this embodiment. Furthermore, since no balancing equipment is required for dynamic balancing tests during disassembly and reassembly of the engine rotor in this embodiment, the requirements for daily maintenance equipment and conditions for the aero-engine equipped with the engine rotor of this embodiment can be reduced.

[0060] Example 3

[0061] like Figures 1 to 6The image shows an aero-engine provided in this embodiment, including the disc-shaft connection structure described in Embodiment 1 or the engine rotor described in Embodiment 2. In this embodiment of the aero-engine, a guide positioning member 131 is protruding on the outer peripheral wall of the journal 11 in the disc-shaft connection structure, located between two adjacent sets of external key teeth in the external spline portion 13. A guide positioning groove 211 matching the guide positioning member 131 is recessed on the inner peripheral wall of the connecting shaft 2. The sliding fit between the guide positioning groove 211 and the guide positioning member 131 determines the unique assembly direction of the connecting disc 1 and the connecting shaft 2, ensuring the uniqueness of the circumferential fit position between the inner spline portion 21 and the outer spline portion 13. This ensures that the circumferential assembly position of the inner spline portion 21 and the outer spline portion 13 of the disc-shaft connection structure remains unchanged before disassembly and after disassembly and reassembly, thereby ensuring the... The unique circumferential assembly position of the engine rotor in this embodiment avoids frequent dynamic balancing tests on the engine rotor. Specifically, it eliminates the need to re-balance the engine rotor after each disassembly, inspection, and reassembly of the disc-shaft connection structure to ensure the rotor's dynamic characteristics meet requirements. This improves the efficiency of disassembly, inspection, and reassembly of the engine rotor. Furthermore, since dynamic balancing tests are not required after disassembly and reassembly of the engine rotor, the requirements for daily maintenance equipment and conditions for this embodiment are reduced.

[0062] Obviously, the above embodiments are merely illustrative examples for clear explanation and are not intended to limit the implementation. Those skilled in the art will recognize that other variations or modifications can be made based on the above description. It is neither necessary nor possible to exhaustively list all possible implementations here. However, obvious variations or modifications derived therefrom are still within the scope of protection of this invention.

Claims

1. A disc-shaft connection structure, characterized in that, include: The connecting disc (1) has a journal (11) protruding from the middle of one end along the axial direction, and a central hole (12) is formed through the connecting disc (1) and the journal (11) along the axial direction. An external spline portion (13) is provided circumferentially on the outer peripheral wall of the journal (11), and a guide positioning member (131) is provided on the outer peripheral wall of the journal (11) at a position between two adjacent external key teeth of the external spline portion (13). The connecting shaft (2) has an inner spline (21) on its inner peripheral wall facing the journal (11) along the circumferential direction. The inner spline (21) matches the outer spline (13). The connecting shaft (2) has a guide positioning groove (211) recessed on its inner peripheral wall corresponding to the guide positioning member (131). The guide positioning groove (211) passes through the connecting shaft (2) axially at one end facing the journal (11) and matches the guide positioning member (131). It also includes an axial locking assembly, which is used to connect and lock the connecting disc (1) and the connecting shaft (2) axially and lock them into a whole; The connecting shaft (2) is provided with a connecting part (22), and the projection of the journal (11) along the axial direction falls within the range of the connecting part (22). The connecting part (22) is provided with an internal thread hole on the end face of the journal (11) along the axial direction. The axial locking assembly includes a locking member (31) that is movably inserted into the center hole (12). The locking member (31) is provided with an external thread (311) on the outer peripheral wall of one end of the locking member (31) that is axially facing the connecting part (22). The external thread (311) matches the internal thread hole. The locking member (31) is provided with a limiting part (312) that is radially protruding on the outer peripheral wall of the locking member (31) that is axially away from the connecting part (22). The outer diameter of the limiting part (312) is larger than the inner diameter of the center hole (12).

2. The disc-shaft connection structure according to claim 1, characterized in that, When the external threaded part (311) is assembled with the internal threaded hole, the locking member (31) and the internal threaded hole are arranged at intervals along the axial direction to form an oil groove (23); a through hole (313) is formed on the locking member (31) along the axial direction, and the through hole (313) communicates with the oil groove (23). And / or, the inner wall of the central hole (12) is provided with a partition seat (14) protruding radially toward the center of the central hole (12). The middle part of the partition seat (14) is formed with a through hole through the axial direction. The through hole allows the locking member (31) to move through. The partition seat (14) divides the central hole (12) into a first hole (121) and a second hole (122) axially. The first hole (121) is located at one end of the second hole (122) away from the connecting shaft (2). The outer diameter of the limiting part (312) is larger than the diameter of the through hole and smaller than the diameter of the first hole (121). When the disc shaft connection structure is in the assembled state, the limiting part (312) and the two end faces of the partition seat (14) facing each other axially are abutted, and the limiting part (312) is located in the first hole (121).

3. The disc-shaft connection structure according to claim 2, characterized in that, The locking member (31) has a guide groove (314) recessed on the outer peripheral wall of one end facing the connecting part (22) along the axial direction. The guide groove (314) passes through the external thread part (311) along the axial direction and communicates with the oil groove (23).

4. The disc-shaft connection structure according to claim 3, characterized in that, The depth of the guide groove (314) is not less than the thread depth of the external thread (311); And / or, two flow channels (314) are provided, and the two flow channels (314) are arranged symmetrically about the axis of the locking member (31).

5. The disc-shaft connection structure according to claim 2, characterized in that, Multiple fastening grooves (315) are provided on the outer side wall of the limiting part (312) at intervals along the circumference of the limiting part (312); deformable cup-shaped locking pieces (32) corresponding one-to-one with the fastening grooves (315) are arranged at intervals along the circumference of the through hole; during assembly, the cup-shaped locking pieces (32) are flipped and locked in the fastening grooves (315) along the radial direction of the limiting part (312) toward the center of the limiting part (312).

6. The disc-shaft connection structure according to claim 5, characterized in that, The inner wall of the through hole is provided with positioning grooves (141) that correspond one-to-one with the cup-shaped locking piece (32) along the circumferential direction of the limiting part (312). The cup-shaped locking piece (32) can be detachably inserted into the positioning groove (141) at one end facing the connecting shaft (2) along the axial direction.

7. An engine rotor, characterized in that, Includes the disc shaft connection structure as described in any one of claims 1 to 6.

8. An aircraft engine, characterized in that, Includes the disc shaft connection structure as described in any one of claims 1 to 6.

Images