Main bearing locking nut anti-loosening structure and aero-engine
By combining a locking nut, a locking plate, and an anti-rotation sleeve, the problem of loosening of the locking nut of the main bearing of an aero-engine under vibration and impact is solved, achieving a reliable anti-loosening effect, reducing production costs, and avoiding damage to the inner ring of the main bearing.
Patent Information
- Application Number
- CN202520826338.6
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-04-28
- Publication Date
- 2026-01-30
- Estimated Expiration
- 2035-04-28
AI Technical Summary
The existing main bearing locking nuts of aero-engines are prone to loosening under long-term vibration and impact, resulting in a decrease in preload or detachment. Existing mechanical anti-loosening structures are prone to deformation and breakage, thus losing their anti-loosening effect.
The system employs a combination structure of a locking nut, a locking plate, and an anti-rotation sleeve. The first tooth of the locking plate is embedded in the groove of the locking nut, and the notch of the anti-rotation sleeve engages with the second tooth of the locking plate. Combined with the positioning of the spiral retaining ring, this achieves multi-directional limiting of the locking nut, locking plate, and anti-rotation sleeve, preventing loosening.
It effectively prevents the locking nut from loosening under vibration and impact. The structure is simple and reliable, reducing production costs, avoiding deformation and detachment of the anti-loosening components, enhancing the anti-loosening effect, and preventing damage to the inner ring of the main bearing.
Smart Images
Figure CN223854689U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model relates to aerospace technology field especially relates to a main bearing locking nut anti-loose structure and aero-engine. BACKGROUND
[0002] The aero-engine requires that the main bearing locking nut of the engine cannot be loosened in the whole life cycle, so as to always ensure the pre-tightening of the locking nut and the main bearing in the normal working state, and the main bearing of the engine is prone to loosening under the action of alternating load and vibration for a long time in the working state, which leads to the pre-tightening force of the locking nut to decrease or even fall off.
[0003] The current anti-loose mode of the main bearing locking nut of the engine mainly adopts a simple mechanical anti-loose locking of a T-shaped locking piece, a cup-shaped washer and a pin on the locking nut. In a long-term vibration and impact environment, the components of the mechanical anti-loose structure are prone to deformation, fracture or falling off, so as to lose the anti-loose effect and make the locking nut loosen again. SUMMARY
[0004] In view of the above analysis, the utility model embodiment aims to provide a main bearing locking nut anti-loose structure and an aero-engine, so as to solve the problem of unreliable mechanical anti-loose locking of the locking nut in the prior art.
[0005] The utility model mainly aims to realize the following technical scheme:
[0006] The first aspect of the utility model provides a main bearing locking nut anti-loose structure, which comprises a locking nut, a locking piece and an anti-rotation sleeve, wherein the locking nut is sleeved on the outside of the journal of the engine rotating shaft.
[0007] The locking nut comprises a fixed section and an engagement section, the fixed section is fixed to the journal, and the engagement section is externally provided with a first groove in the circumferential direction;
[0008] The locking piece comprises a locking piece main body, a first tooth and a second tooth, the first tooth is embedded in the first groove, and the circumferential movement of the locking nut is limited;
[0009] The anti-rotation sleeve comprises a fixed part and an anti-rotation part, the fixed part is connected with the journal, the inner wall surface of the anti-rotation part is attached to the outer wall surface of the locking nut and the locking piece, and the end part of the anti-rotation part has a notch which is mutually embedded with the second tooth.
[0010] Further, a spiral check ring is further included, the inside of the anti-rotation part near the notch is provided with a clamping groove, the outer edge of the spiral check ring is in abutment with the bottom surface of the clamping groove, and the inner end surface of the spiral check ring is attached to the outer end surface of the second tooth.
[0011] Further, the locking piece main body is in a cylindrical shape.
[0012] Further, the first teeth are uniformly arranged on the rear end of the lock piece body in the circumferential direction, and extend outward along the axial direction from the circumferential edge of the rear end surface of the lock piece body; the first teeth are embedded in the first grooves of the clamping section of the lock nut.
[0013] Further, the second teeth are uniformly arranged on the front end of the lock piece body in the circumferential direction, and extend outward along the radial direction from the circumferential edge of the front end surface of the lock piece body.
[0014] In a second aspect, the utility model provides an aero-engine, including the pivot, main bearing assembly and the main bearing lock nut anti looseness structure.
[0015] Further, the journal of the pivot includes a threaded section and a non-threaded section; the threaded section has external threads, and the fixed section of the lock nut has internal threads that are screwed with the external threads.
[0016] Further, the main bearing assembly includes a main bearing inner ring; the fixed section is arranged between the lock nut and the main bearing inner ring.
[0017] Further, the fixed section includes a first abutting surface and a second abutting surface;
[0018] The first abutting surface is abutted with the inner end surface of the lock nut, and the second abutting surface is abutted with the end surface of the main bearing inner ring.
[0019] Further, the end edge of the fixed section is uniformly provided with a protrusion in the circumferential direction, and the protrusion extends inward along the radial direction.
[0020] The non-threaded section of the pivot is provided with a second groove; the protrusion is embedded in the second groove.
[0021] Compared with the prior art, the utility model can achieve at least one of the following beneficial effects:
[0022] (1) Compared with the prior art, in the utility model, the first teeth of the lock piece are embedded in the first grooves of the clamping section of the lock nut, the anti-rotation sleeve is arranged outside the lock nut, the circumferential movement of the lock nut is limited, and the anti-looseness of the lock nut is realized; the fixed section of the anti-rotation sleeve is fixed to the journal, the anti-rotation section is arranged outside the lock piece, the notch at the end of the anti-rotation section is embedded in the second teeth of the lock piece, the circumferential movement of the lock piece is limited, and the anti-looseness of the lock piece is realized; the embedding of the notch and the second teeth also limits the circumferential movement of the anti-rotation section, and the anti-looseness of the anti-rotation sleeve is realized at the same time. The utility model realizes the anti-looseness of the lock nut, the lock piece and the anti-rotation sleeve in the anti-looseness structure, avoids the anti-looseness failure caused by the deformation and falling off of the anti-looseness component when only the lock nut is anti-loosened, and has the advantages of simple and reliable structure, convenient installation and disassembly.
[0023] (2) The anti-rotation sleeve is internally provided with a clamping groove, a spiral retaining ring is clamped in the clamping groove, the spiral retaining ring is attached to the outer end surface of the second tooth of the locking piece, the locking piece is axially positioned, and the locking piece is prevented from being pulled out; meanwhile, the spiral retaining ring is arranged in the internal clamping groove of the anti-rotation sleeve, and the spiral retaining ring also limits the axial movement of the anti-rotation sleeve.
[0024] (3) The locking piece is in a cylindrical structure, does not need to be bent and deformed before and after installation, can be repeatedly used, has low cost and good assembly; the anti-rotation sleeve has an L-shaped cross section along the central axis, the attachment surface of the fixing portion of the anti-rotation sleeve is attached to the end surface of the locking nut, the inside of the anti-rotation portion is attached to the locking piece, and the anti-rotation sleeve does not need to be bent during assembly and will not be plastically deformed, so that the locking piece and the anti-rotation sleeve in the utility model can be repeatedly used and do not need to be used as consumables, thereby reducing the production cost.
[0025] (4) The anti-rotation sleeve is fixed to the non-threaded section of the shaft neck, the locking piece is embedded in the non-threaded section of the locking nut, and the threaded sections of the shaft neck and the locking nut are not provided with grooves, so that the strength of the thread is not weakened.
[0026] (5) In the prior art, in order to avoid damaging the inner ring of the main bearing, two modes of grinding and pressing the cross section of the nut or adding a gasket are usually adopted. The surface structure of the nut is damaged by grinding, and the gasket is frequently disassembled and assembled, which causes fatigue failure and affects the locking effect. In the utility model, the fixing portion of the anti-rotation sleeve is arranged between the locking nut and the inner ring of the main bearing, which is used for fixing the anti-rotation sleeve and avoiding damage to the nut by grinding and avoiding frictional damage to the end surface of the inner ring of the main bearing caused by the locking nut during tightening, without the need of adding a gasket, and the anti-rotation portion and the fixing portion of the anti-rotation sleeve are integrated, the fixing portion is fixed to the shaft neck, and the locking effect of the locking piece and the locking nut is further enhanced.
[0027] In the utility model, the above technical solutions can be combined with each other to realize more optional combination solutions. Other features and advantages of the utility model will be described in the following content, and some advantages can be obvious from the description or can be understood by implementing the utility model. The purpose and other advantages of the utility model can be realized and obtained from the content specially pointed out in the description and the drawings. BRIEF DESCRIPTION OF DRAWINGS
[0028] The drawings are only used for the purpose of illustrating specific embodiments and are not considered as limiting the utility model, and the same reference signs represent the same parts in the whole drawings.
[0029] Figure 1 It is an external structure diagram of the main bearing locking nut locking structure of the embodiment 1.
[0030] Figure 2 Structure diagram of the engagement between the notch of the anti-rotation sleeve and the second tooth of the locking plate of the anti-loosening structure of Example 1;
[0031] Figure 3 Structure diagram of the anti-loosening structure of Example 1 without the anti-rotation sleeve;
[0032] Figure 4 Structure diagram of the anti-loosening structure of Example 1 in cross section;
[0033] Figure 5 Local enlarged diagram of the engagement between the anti-loosening structures of Example 1;
[0034] Figure 6 Structure diagram of the locking nut of Example 1;
[0035] Figure 7 Structure diagram of the anti-rotation sleeve of Example 1;
[0036] Figure 8 Structure diagram of the locking plate of Example 1;
[0037] Figure 9 Flowchart of the anti-loosening method of Example 3;
[0038] Figure 10 Structure diagram of the journal and the main bearing assembly when the anti-loosening structure is not installed of Example 3;
[0039] Figure 11 Structure diagram of Example 3 after the anti-rotation sleeve is installed;
[0040] Figure 12 Structure diagram of Example 3 after the locking nut is installed;
[0041] Figure 13 Structure diagram of Example 3 after the locking plate is installed;
[0042] Figure 14 Structure diagram of Example 3 after the spiral retainer is installed.
[0043] Reference signs:
[0044] 1 - journal, 11 - threaded section, 12 - non-threaded section, 121 - second groove, 2 - locking nut, 21 - fixed section, 22 - clamping section, 3 - locking plate, 31 - locking plate body, 32 - first tooth, 33 - second tooth, 4 - anti-rotation sleeve, 41 - fixed part, 411 - protrusion, 42 - anti-rotation part, 421 - notch, 422 - clamping groove, 5 - spiral retainer, 6 - main bearing inner ring. DETAILED DESCRIPTION
[0045] The preferred embodiments of the utility model are specifically described below in combination with the drawings, wherein the drawings form a part of the utility model and are used together with the embodiments of the utility model to explain the principles of the utility model, and are not used to limit the scope of the utility model.
[0046] Embodiment 1
[0047] As shown in a specific embodiment of the utility model, Figures 1-5 a main bearing locking nut anti-loose structure is disclosed, comprising a locking nut 2, a locking piece 3 and an anti-rotation sleeve 4 which are sleeved on the outside of the journal 1 of the engine rotating shaft.
[0048] As shown in Figure 6 , the locking nut 2 comprises a fixed section 21 and a clamping section 22. As shown in Figure 5 , the fixed section 21 is provided with an internal thread and is connected with the external thread of the journal 1 to be fixed to the journal 1. In order to facilitate the installation of the anti-loose component, the locking nut 2 is also provided with the clamping section 22. As shown in Figure 3 , the outside of the clamping section 22 is provided with a plurality of first grooves in the circumferential direction. Exemplarily, the grooves in the embodiment are square cross-section grooves and are uniformly distributed in the circumferential direction.
[0049] As shown in Figure 7 , the locking piece 3 comprises a locking piece body 31, a first tooth 32 arranged at the rear end of the locking piece body 31 and a second tooth 33 arranged at the front end of the locking piece body 31.
[0050] The locking piece body 31 is cylindrical.
[0051] The first tooth 32 is an extension part extending outward along the axial direction from the circumferential edge of the rear end face of the locking piece body 31. Exemplarily, the first tooth 32 is uniformly distributed along the circumferential edge of the rear end face of the locking piece body 31. The first tooth 32 is embedded in the first groove to limit the circumferential movement of the clamping section 22 of the locking nut 2.
[0052] In the embodiment, the first tooth 32 of the locking piece body 31 is embedded in the first groove of the clamping section 22 to limit the circumferential movement of the fixed section 21 of the locking nut 2, so as to prevent the thread from loosening and failing under the load of impact and vibration and the locking nut 2 from loosening.
[0053] The second tooth 33 is arranged at the front end of the locking piece body 31 and extends outward along the radial direction from the circumferential edge of the front end face of the locking piece body 31. Exemplarily, the second tooth 33 is uniformly distributed from the circumferential edge of the front end face of the locking piece body 31. The second tooth 33 is used to be connected with the anti-rotation sleeve 4.
[0054] As shown in Figure 5 and Figure 8As shown, the anti-rotation sleeve 4 is L-shaped in the cross section through its central axis. The anti-rotation sleeve 4 comprises a fixing portion 41 and an anti-rotation portion 42. The anti-rotation portion 42 is sleeved outside the lock piece body 31, and the fixing portion 41 is perpendicular to the axis thereof.
[0055] A part of the inner wall surface of the anti-rotation portion 42 is attached to the outer wall surface of the lock piece body 31 and the first tooth 32 to limit the circumferential movement of the lock piece 3; another part is attached to the outer wall surface of the lock nut 2 to further limit the circumferential movement of the lock nut 2. As shown in Figure 2 and Figure 5 As shown, the front end of the anti-rotation portion 42 has a notch 421 which is mutually engaged with the second tooth 33. The second tooth 33 is inserted into the notch 421 and engaged with the notch 421 to limit the circumferential movement of the lock piece 3 again. In this embodiment, the anti-rotation sleeve 4 is sleeved outside the fixing segment 21 by the anti-rotation portion 42, and the end notch 421 of the anti-rotation portion 42 is engaged with the second tooth 33 to achieve the anti-loose effect of the lock piece 3. At the same time, the engagement of the notch 421 and the second tooth 33 also limits the circumferential movement of the anti-rotation portion 42, thereby achieving the anti-loose effect of the anti-rotation sleeve 4.
[0056] As shown in Figure 4 and Figure 5 The fixing portion 41 is connected with the shaft neck 1 to fix the anti-rotation sleeve 4 on the shaft neck 1. The shaft neck 1 is provided with a second groove 121, and the end edge of the fixing portion 41 is uniformly provided with a protrusion 411 in the circumferential direction, as shown in Figure 5 The protrusion 411 extends radially inwardly to be clamped into the second groove 121 of the shaft neck 1.
[0057] The fixing portion 41 is arranged between the lock nut 2 and the main bearing inner ring 6. The fixing portion 41 comprises a first abutting surface and a second abutting surface. The first abutting surface is abutted with the inner end surface of the lock nut 2, and the second abutting surface is abutted with the end surface of the main bearing inner ring 6.
[0058] In the prior art, between the lock nut 2 and the main bearing inner ring 6, in order to avoid damage to the main bearing inner ring 6, two ways are usually adopted, i.e. grinding the lock nut 2 or adding a gasket. Grinding the lock nut 2 will damage the surface structure of the lock nut 2, and the frequent disassembly after using the gasket will cause fatigue failure, thereby affecting the anti-loose effect. In this embodiment, the fixing portion 41 of the anti-rotation sleeve 4 is arranged between the lock nut 2 and the main bearing inner ring 6, which is used for fixing the anti-rotation sleeve 4 on one hand, and on the other hand, avoids the damage of the lock nut 2 by grinding and the frictional damage of the end surface of the main bearing inner ring 6 caused by the lock nut 2 during tightening, without the need of adding a gasket additionally. Moreover, the anti-rotation portion 42 and the fixing portion 41 of the anti-rotation sleeve 4 are integrated, and the fixing of the fixing portion 41 and the shaft neck 1 further enhances the anti-loose effect of the lock piece 3 and the lock nut 2.
[0059] Further, a spiral retainer 5 is further included. As shown inFigure 5 As shown, the anti-rotation part 42 is internally provided with a clamping groove 422 near the gap 421, and the outer edge of the spiral retainer 5 abuts the bottom surface of the clamping groove 422. The spiral retainer 5 is tightly attached to the inner wall of the clamping groove 422 under the tightening action of its radial elastic force and centrifugal force, thereby preventing it from falling off. The inner end surface of the spiral retainer 5 is in abutment with the outer end surface of the second tooth 33.
[0060] In this embodiment, the anti-rotation sleeve 4 is internally provided with a clamping groove, and the spiral retainer 5 is clamped therein to axially position the locking piece 3 and prevent it from falling out. At the same time, since the spiral retainer 5 is arranged in the internal clamping groove 422 of the anti-rotation sleeve 4, the arrangement of the spiral retainer 5 also limits the axial movement of the anti-rotation sleeve 4.
[0061] Compared with the prior art, in this embodiment, the first tooth 32 of the locking piece 3 is embedded in the first groove of the clamping section 22 of the locking nut 2, the anti-rotation sleeve 4 is arranged outside the locking nut 2 to limit the circumferential movement of the locking nut 2, and the anti-rotation sleeve 4 and the locking piece 3 jointly realize the anti-loosening of the locking nut 2; the fixed part 41 of the anti-rotation sleeve 4 is fixed to the shaft neck 1, the anti-rotation part 42 is arranged outside the locking piece 3, the gap 421 at the end of the anti-rotation part 42 is embedded with the second tooth 33 of the locking piece 3, thereby limiting the circumferential movement of the locking piece 3, and the anti-rotation part 42 and the locking piece 3 jointly realize the anti-loosening of the locking piece 3; the embedding of the gap 421 and the second tooth 33 also limits the circumferential movement of the anti-rotation part 42, thereby synchronously realizing the anti-loosening of the anti-rotation sleeve 4. In this embodiment, the locking nut 2, the locking piece 3, and the anti-rotation sleeve 4 in the anti-loosening structure are all anti-loosened, thereby avoiding the anti-loosening failure caused by the deformation and falling off of the anti-loosening components when only the locking nut 2 is anti-loosened, and the structure is simple and reliable, and easy to install and disassemble.
[0062] In this embodiment, the locking piece 3 is in a cylindrical structure and does not need to be bent and deformed before and after installation, can be repeatedly used, has low cost, and is good in assembly; the anti-rotation sleeve 4 has an L-shaped cross section passing through the center axis, the abutment surface of the fixed part 41 is in abutment with the end surface of the locking nut 2, and the inside of the anti-rotation part 42 is in abutment with the locking piece 3, so that the anti-rotation sleeve 4 does not need to be bent during assembly and will not be plastically deformed, and therefore the locking piece 3 and the anti-rotation sleeve 4 in this embodiment can be repeatedly used and do not need to be consumable parts, thereby reducing the production cost.
[0063] Embodiment 2
[0064] This embodiment discloses an aero-engine, which comprises a rotating shaft, a main bearing assembly, and the anti-loosening structure of the main bearing locking nut of embodiment 1.
[0065] The shaft neck 1 of the rotating shaft comprises a threaded section 11 and a non-threaded section 12. The threaded section 11 has external threads, and the fixed section 21 of the locking nut 2 has internal threads, and the internal threads are screwed with the external threads to fix the locking nut 2.
[0066] The main bearing assembly comprises a main bearing inner ring 6. The fixing portion 41 of the anti-rotation sleeve 4 is arranged between the lock nut 2 and the main bearing inner ring 6.
[0067] The non-threaded section 12 of the shaft is provided with a second groove 121, and the protrusion 411 of the fixing portion 41 of the anti-rotation sleeve 4 is embedded in the second groove 121 to fix the anti-rotation sleeve 4.
[0068] The anti-rotation sleeve 4 is fixed to the non-threaded section 12 of the shaft neck 1, the locking piece 3 is embedded in the non-threaded section 12 of the lock nut 2, and the threaded sections 11 of the shaft neck 1 and the lock nut 2 are not provided with grooves, thereby avoiding weakening the strength of the threads.
[0069] Compared with the prior art, the aero-engine of the embodiment has the same advantages as the main bearing lock nut anti-loosening structure described above, and will not be described here.
[0070] Embodiment 3
[0071] The embodiment provides a main bearing lock nut anti-loosening method, as shown in Figure 9 based on the main bearing lock nut anti-loosening structure shown in Embodiment 1, comprising the following steps:
[0072] Step 1: install the anti-rotation sleeve 4, and fix the anti-rotation sleeve 4 to the non-threaded section 12 of the shaft neck 1;
[0073] Embed the protrusion 411 of the fixing portion 41 of the anti-rotation sleeve 4 in the second groove 121 of the shaft neck 1 to fix one end of the anti-rotation sleeve 4 to the non-threaded section 12 of the shaft neck 1;
[0074] As shown in Figure 10 is the shaft neck 1 after the main bearing is installed. As shown in Figure 11 , the anti-rotation sleeve 4 is installed on the shaft neck 1 of the main bearing; during installation, the protrusion 411 of the fixing portion 41 of the anti-rotation sleeve 4 is embedded in the second groove 121 of the non-threaded section 12 of the shaft neck 1 to fix the anti-rotation sleeve 4. At the same time, the fixing portion 41 of the anti-rotation sleeve 4 separates the lock nut 2 and the main bearing inner ring 6, thereby avoiding the need to grind the lock nut 2 to press the fracture surface when the lock nut 2 directly contacts the bearing in the prior art, and avoiding the addition of a gasket that causes the gasket to fatigue and fail during subsequent disassembly, thereby affecting the anti-loosening effect. At the same time, the anti-rotation portion 42 and the fixing portion 41 of the anti-rotation sleeve 4 are integrated, the fixing portion 41 is fixed to the shaft neck 1, and the anti-loosening effect of the locking piece 3 and the lock nut 2 is further enhanced.
[0075] Step 2: install the lock nut 2, and rotate the fixing section 21 of the lock nut 2 into the threaded section 11 of the shaft neck 1 and fix it;
[0076] The fixing section 21 of the lock nut 2 is rotated into the threaded section 11 of the shaft neck 1, and the embedding section 22 faces one side of the fixing portion 41 of the anti-rotation sleeve 4.
[0077] AsFigure 12 As shown, the locking nut 2 is installed; during installation, the fixed section 21 of the locking nut 2 is screwed into the threaded section 11 of the shaft neck 1, and the fitting section 22 faces one side of the fixed part 41 of the anti-rotation sleeve 4. At this time, the end face of the fitting section 22 of the locking nut 2 is attached to the fixed part 41, one side of the fixed part 41 of the anti-rotation sleeve 4 is attached to the locking nut 2, and the other side is attached to the main bearing inner ring 6, limiting the axial direction of the anti-rotation sleeve 4.
[0078] Step 3: Install the locking piece 3 to limit the circumferential movement of the locking nut 2; and limit the circumferential movement of the locking piece 3 and the anti-rotation sleeve 4;
[0079] The locking piece 3 is sleeved outside the locking nut 2, the first tooth 32 is fitted with the first groove of the locking section 22 of the locking nut 2, and the circumferential movement of the locking nut 2 is limited; the second tooth 33 and the notch 421 of the anti-rotation sleeve 4 are fitted with each other, and the circumferential movement of the locking piece 3 and the anti-rotation sleeve 4 is limited.
[0080] As shown in the figure, Figure 13 Install the locking piece 3. During installation, the locking piece 3 is sleeved outside the locking nut 2, the first tooth 32 is fitted with the first groove of the locking section 22 of the locking nut 2, and the circumferential movement of the locking nut 2 is limited together to achieve the locking effect of the locking nut; the second tooth 33 and the notch 421 of the anti-rotation sleeve 4 are fitted with each other, and the circumferential movement of the locking piece 3 and the anti-rotation sleeve 4 is limited, at the same time, the locking piece 3 is installed inside the anti-rotation sleeve 4, tightly attached to the inner wall of the anti-rotation sleeve 4, achieving the locking effect of the locking piece 3 and the anti-rotation sleeve 4.
[0081] Step 4: Install the spiral retainer 5 of the main bearing locking nut anti-loose structure to limit the axial movement of the anti-rotation sleeve 4 and the locking piece 3, and complete the anti-loose of the locking nut, the locking piece and the anti-rotation sleeve.
[0082] The spiral retainer 5 is clamped into the front end clamping groove 412 of the anti-rotation sleeve 4, and the inner end face of the spiral retainer 5 is attached to the outer end face of the second tooth 33, limiting the axial movement of the anti-rotation sleeve 4 and the locking piece 3.
[0083] As shown in the figure, Figure 14 Install the spiral retainer 5. The spiral retainer 5 is clamped into the front end clamping groove 412 of the anti-rotation sleeve 4, and the inner end face of the spiral retainer 5 is attached to the outer end face of the second tooth 33, limiting the axial movement of the anti-rotation sleeve 4 and the locking piece 3.
[0084] It should be noted that the spiral retainer 5 is made of elastic material and can be tightly attached to the inner wall of the clamping groove 422 under the action of its radial elastic force and centrifugal force to prevent falling off.
[0085] The above merely describes a preferred embodiment of the present application, and the protection scope of the present application is not limited thereto, and any person skilled in the art can easily think of changes or replacements within the technical scope disclosed by the present application, which should be covered within the protection scope of the present application.
Claims
1. A locking nut anti-loosening structure for a main bearing, characterized in that, The locking nut (2), the locking piece (3) and the anti-rotation sleeve (4) are arranged outside the journal (1) of the rotating shaft of the engine; The locking nut (2) comprises a fixed section (21) and a clamping section (22); the fixed section (21) is fixed to the journal (1), and the clamping section (22) is externally provided with a first groove in the circumferential direction; The locking piece (3) comprises a locking piece body (31), a first tooth (32) and a second tooth (33); the first tooth (32) is embedded in the first groove, and the first tooth (32) limits the circumferential movement of the locking nut (2); The anti-rotation sleeve (4) comprises a fixed part (41) and an anti-rotation part (42); the fixed part (41) is connected with the journal (1); the inner wall surface of the anti-rotation part (42) is attached to the outer wall surface of the locking nut (2) and the locking piece (3); and the end part of the anti-rotation part (42) has a notch (421) which is mutually embedded with the second tooth (33).
2. The main bearing lock nut anti-loose structure according to claim 1, characterized in that, Further comprising a spiral check ring (5); the inner part of the anti-rotation part (42) near the notch (421) is provided with a clamping groove (422), the outer edge of the spiral check ring (5) abuts against the bottom surface of the clamping groove (422); and the inner end surface of the spiral check ring (5) is attached to the outer end surface of the second tooth (33).
3. The main bearing lock nut anti-loose structure according to claim 1, characterized in that, The locking piece body (31) is cylindrical.
4. The main bearing lock nut anti-loose structure according to claim 3, characterized in that, The first tooth (32) is uniformly arranged on the rear end of the locking piece body (31) in the circumferential direction, and the first tooth (32) extends outward along the axial direction from the circumferential edge of the rear end surface of the locking piece body (31); and the first tooth (32) is embedded with the first groove.
5. The main bearing lock nut anti-loose structure according to claim 3, characterized in that, The second tooth (33) is uniformly arranged on the front end of the locking piece body (31) in the circumferential direction, and the second tooth (33) extends outward along the radial direction from the circumferential edge of the front end surface of the locking piece body (31).
6. An aeroengine characterised in that, The rotating shaft, the main bearing assembly and the main bearing locking nut anti-loose structure of any one of claims 1-5 are comprised.
7. The aeroengine of claim 6, wherein, The journal (1) of the rotating shaft comprises a threaded section (11) and a non-threaded section (12); the threaded section (11) has external threads, and the fixed section (21) of the locking nut (2) has internal threads which are screwed with the external threads.
8. The aeroengine of claim 7, wherein, The main bearing assembly comprises a main bearing inner ring (6); and the fixed part (41) is arranged between the locking nut (2) and the main bearing inner ring (6).
9. The aeroengine of claim 8, wherein, The fixed part (41) comprises a first attachment surface and a second attachment surface; The first attachment surface is attached to the inner end surface of the locking nut (2), and the second attachment surface is attached to the end surface of the main bearing inner ring (6).
10. The aeroengine of claim 8, wherein, The end edge of the fixed part (41) is uniformly provided with a protrusion (411) in the circumferential direction, and the protrusion (411) extends inward in the radial direction; The non-threaded section (12) of the rotating shaft is provided with a second groove (121); and the protrusion (411) is embedded with the second groove (121).