Bolt anti-rotation assembly structure

Abstract

The application discloses a bolt anti-rotation assembly structure, which comprises an anti-rotation bolt, an anti-rotation sleeve and a locking sleeve. The head end of the anti-rotation bolt is in abutment with the assembly component abutment surface and is provided with surface structure capable of being embedded into the anti-rotation groove at the bolt hole of the assembly component, so as to prevent the bolt from rotating during assembly. A plurality of anti-rotation grooves are formed on the outer rod body of the tail end in the axial direction. The anti-rotation sleeve is arranged on the anti-rotation bolt in a rotating manner, and a plurality of anti-rotation assemblies are arranged on the anti-rotation sleeve in a corresponding manner. A pulling assembly is arranged for pulling the anti-rotation assembly. The locking sleeve is arranged on the tail end of the anti-rotation bolt outside the anti-rotation sleeve in a rotating manner. When the locking sleeve is gradually rotated to the tail end of the anti-rotation bolt, the front end of the locking sleeve is gradually in abutment with the head part and the rod part of the sliding rod of the anti-rotation assembly and pushes the sliding rod backward. The inner ring surface of the locking sleeve is gradually in abutment with the anti-rotation block of the anti-rotation assembly and pushes the anti-rotation block into the anti-rotation groove. Through the combination of the anti-rotation block and the anti-rotation groove, the anti-rotation sleeve can be prevented from rotating and causing the assembly to be loose, and the reliability of the assembly is improved.

Description

Technical Field

[0001] This invention relates to a bolt anti-rotation assembly structure, belonging to the field of aero-engine assembly technology. Background Technology

[0002] In the current axial-flow compressor structure of aero engines, there are numerous rotor disks and casing structures, which are typically fixed together by bolts and nuts. Because axial-flow engines or gas turbines are generally installed vertically during assembly, and the operating space is limited, anti-rotation measures are usually required to prevent bolts from rotating during tightening. Common anti-rotation measures involve designing anti-rotation features on the bolts, rotor disks, or casing structures. This typically involves using irregularly shaped bolt heads and designing anti-rotation grooves on the flange edges of the rotor disk or casing. During assembly, these features limit the rotation, achieving the anti-rotation effect. However, since the bolt ends are usually secured with nuts, the anti-loosening effect of a single nut is poor, and it can loosen due to vibration, affecting the reliability of the assembly. Summary of the Invention

[0003] The purpose of this invention is to provide a bolt anti-rotation assembly structure that can ensure bolt anti-rotation during installation while also ensuring assembly reliability.

[0004] To achieve the above objectives, the technical solution adopted by the present invention is as follows:

[0005] A bolt anti-rotation assembly structure, comprising:

[0006] The anti-rotation bolt has a surface structure at its head end that abuts against the assembly component, allowing it to be embedded in the anti-rotation groove at the screw hole of the assembly component; multiple anti-rotation grooves are provided on the outer rod body at the tail end along the axial direction.

[0007] An anti-rotation sleeve, screwed onto an anti-rotation bolt, is used to fix and assemble components in conjunction with the anti-rotation bolt. It includes a threaded ring and a cylindrical body disposed on the outer end face of the threaded ring. The inner diameter of the cylindrical body is larger than the inner diameter of the screw and is coaxially arranged. Multiple countersunk grooves are correspondingly opened on the outer periphery of the threaded ring, and a sliding groove communicating with the interior of the cylindrical body is opened in each countersunk groove.

[0008] Multiple anti-rotation components are correspondingly provided on the outer end face of the spiral ring located inside the cylinder; the anti-rotation component includes a positioning block installed on the spiral ring, and an anti-rotation rod hinged to the end of the positioning block away from the cylinder, and an anti-rotation block that fits into the anti-rotation groove is provided at the end of the anti-rotation rod.

[0009] The ring body is also equipped with a traction assembly for pulling the anti-rotation rod. The traction assembly includes a sleeve fitted on the anti-rotation rod, a sliding rod that passes through the sink groove and the slide groove and is connected to the sleeve; a rubber sleeve is provided inside the sleeve, and a spring is fitted on the anti-rotation rod located between the sleeve and the positioning block; the diameter of the head of the sliding rod is larger than the diameter of the rod body, the head of the sliding rod is located outside the sink groove, and the rod body of the sliding rod can slide up and down and back and forth relative to the slide groove; and a spring is also fitted on the sliding rod to abut against the head of the sliding rod and the inside of the slide groove.

[0010] It also includes: an upper locking sleeve, screwed onto the tail end of the anti-rotation bolt located outside the anti-rotation sleeve; the upper locking sleeve has an annular groove for the outer end of the cylinder to be inserted, and an inner annular surface with a convex structure and a sloped transition at the center hole of the upper locking sleeve.

[0011] As the upper locking sleeve is gradually screwed onto the tail end of the anti-rotation bolt, the front end of the upper locking sleeve gradually comes into contact with the head of the sliding rod and the rod part located inside the cylinder, and pushes the sliding rod backward. The inner ring surface of the upper locking sleeve gradually comes into contact with the anti-rotation block and pushes the anti-rotation block into the anti-rotation groove.

[0012] Preferably, the anti-rotation block has a square or spherical structure.

[0013] Preferably, the tail end of the anti-rotation bolt has a double threaded section in both directions, and the anti-rotation sleeve and the upper locking sleeve rotate in opposite directions.

[0014] Preferably, the spiral ring and the cylinder are an integral structure.

[0015] Preferably, the assembly component with the anti-rotation groove is the rotor disk of an aircraft engine.

[0016] Preferably, the assembly component with the anti-rotation groove is the casing of an aircraft engine.

[0017] Preferably, a gasket is also installed at the contact surface between the anti-rotation sleeve and the assembly component, and the gasket is sleeved on the rod of the anti-rotation bolt.

[0018] Preferably, a retaining ring groove for installing a retaining ring is also provided on the rod of the anti-rotation bolt.

[0019] The beneficial effects of this invention are as follows:

[0020] 1. The anti-rotation bolt head has a surface structure that can be embedded in the anti-rotation groove at the screw hole of the assembly component. During assembly, the anti-rotation effect can be achieved by limiting the two.

[0021] 2. By setting an anti-rotation component on the flip sleeve and locking it with an upper locking sleeve, when the upper locking sleeve is gradually rotated to the end of the anti-rotation bolt, the front end of the upper locking sleeve gradually abuts against the head of the sliding rod and the rod part located in the cylinder and pushes the sliding rod backward. The inner ring surface of the upper locking sleeve gradually abuts against the anti-rotation block and pushes the anti-rotation block into the anti-rotation groove. Through the fit between the anti-rotation block and the anti-rotation groove, the anti-rotation sleeve is prevented from rotating and causing the assembly to loosen, thus improving the reliability of the assembly.

[0022] 3. The anti-rotation bolt has a double threaded section with both forward and reverse directions at the tail end, and the anti-rotation sleeve and the upper locking sleeve rotate in opposite directions, which can play an anti-loosening role and further improve the reliability of assembly. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of the anti-rotation bolt assembly;

[0024] Figure 2 This is a schematic diagram of the anti-rotation bolt head structure;

[0025] Figure 3 Schematic diagram of the anti-rotation groove of the assembly component;

[0026] Figure 4 A schematic diagram showing the assembly of the anti-rotation bolt, anti-rotation sleeve, and locking sleeve;

[0027] Figure 5 Another schematic diagram showing the assembly of the anti-rotation bolt, anti-rotation sleeve, and locking sleeve.

[0028] The meanings of the main reference numerals in the figure are as follows:

[0029] 1. Anti-rotation bolt, 2. Assembly component, 3. Anti-rotation groove, 4. Surface structure, 5. Anti-rotation slot, 6. Anti-rotation sleeve, 7. Threaded ring, 8. Cylinder, 9. Sink, 10. Sliding groove, 11. Positioning block, 12. Anti-rotation rod, 13. Anti-rotation block, 14. Sleeve, 15. Sliding rod, 16. Rubber sleeve, 17. Spring, 18. Locking sleeve, 19. Annular groove, 20. Inner annular surface, 21. Washer, 22. Snap ring groove, 23. Snap ring. Detailed Implementation

[0030] The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0031] like Figure 1-5 As shown: This embodiment is a bolt anti-rotation assembly structure, which can be applied to the assembly of rotor disks or casings of aero engines. It includes an anti-rotation bolt 1, an anti-rotation sleeve 6, and a locking sleeve 18. The head end of the anti-rotation bolt 1 has a surface structure 4 on its contact surface with the assembly component 2, which can be embedded into the anti-rotation groove 3 at the bolt hole of the assembly component 2. Figure 1-3As shown, during assembly, the surface structure 4 at the head end of the anti-rotation bolt 1 can be embedded in the anti-rotation groove 3, and the anti-rotation effect can be achieved by limiting the two. The surface structure 4 of the anti-rotation bolt 1 and the anti-rotation groove 3 at the threaded hole of the assembly component 2 in the above solution have been described in detail in the patent publication number CN114909381A, entitled "An Anti-Rotation Assembly Structure of Bolt and Aero Engine Using the Assembly Structure". Those skilled in the art can realize this technical solution without creative effort, so it will not be described in detail here.

[0032] However, since the tail end of the anti-rotation bolt is usually fastened with a common nut, the anti-loosening effect of a single nut is poor and it will loosen due to vibration, affecting the reliability of the assembly. Therefore, the structure needs to be improved. Specifically, multiple anti-rotation grooves 5 are opened on the outer rod of the tail end of the anti-rotation bolt 1 along the axial direction; the anti-rotation sleeve 6 is screwed onto the anti-rotation bolt 1 and is used to fix the assembly component 2 with the anti-rotation bolt 1, including a threaded ring 7 connected to the anti-rotation bolt 1 and a cylinder 8 set on the outer end face of the threaded ring 7. The threaded ring 7 and the cylinder 8 are an integral structure. The inner diameter of the cylinder 8 is larger than the inner diameter of the bolt and the two are coaxially set; multiple countersunk grooves 9 are correspondingly opened on the outer circumference of the threaded ring 7, and a sliding groove 10 communicating with the inside of the cylinder 8 is opened in each countersunk groove 9. Multiple anti-rotation components are provided on the outer end face of the spiral ring 7 located inside the cylinder 8. The anti-rotation components include a positioning block 11 installed on the spiral ring 7 and an anti-rotation rod 12 hinged to the end of the positioning block 11 away from the cylinder 8. An anti-rotation block 13 that fits into the anti-rotation groove 5 is provided at the end of the anti-rotation rod 12. The anti-rotation block 13 can be square or spherical.

[0033] Meanwhile, a pulling assembly for pulling the anti-rotation rod 12 is also provided on the ring body. The pulling assembly includes a sleeve 14 sleeved on the anti-rotation rod 12, a sliding rod 15 passing through the sinker 9 and the slide groove 10 and connected to the sleeve 14; a rubber sleeve 16 is provided inside the sleeve 14. The rubber sleeve 16 can deform after being squeezed to ensure that the anti-rotation rod 12 can tilt inside the sleeve 14 after receiving the force. A spring 17 is sleeved on the anti-rotation rod 12 located between the sleeve 14 and the positioning block 11; the head diameter of the sliding rod 15 is larger than the rod diameter. The head of the sliding rod 15 is located outside the sinker 9, and the rod can slide up and down and back and forth relative to the slide groove 10; at the same time, a spring 17 is also sleeved on the sliding rod 15 and abuts against the head of the sliding rod 15 and the inside of the slide groove 10. The two springs 17 can facilitate the reset of the anti-rotation rod 12 during the process of removing the compressive force.

[0034] The upper locking sleeve 18 is screwed onto the tail end of the anti-rotation bolt 1 located outside the anti-rotation sleeve 6; the upper locking sleeve 18 has an annular groove 19 for the outer end of the cylinder 8 to be inserted, and an inner annular surface 20 with a convex structure and a sloping transition at the center hole of the upper locking sleeve 18 is provided; see also Figure 4 ,5 As shown, when the upper locking sleeve 18 is gradually screwed onto the tail end of the anti-rotation bolt 1, the front end of the upper locking sleeve 18 gradually abuts against the head of the sliding rod 15 and the rod portion located inside the cylinder 8, and pushes the sliding rod 15 backward. The inner ring surface 20 of the upper locking sleeve 18 gradually abuts against the anti-rotation block 13 and finally pushes the anti-rotation block 13 into the anti-rotation groove 5. Through the engagement of the anti-rotation block 13 and the anti-rotation groove 5, the anti-rotation sleeve 6 is prevented from rotating, which would cause the assembly to loosen, thus improving the reliability of the assembly.

[0035] To further improve assembly reliability, a double-threaded section with both forward and reverse threads is machined at the tail end of the anti-rotation bolt 1, and the anti-rotation sleeve 6 and the upper locking sleeve 18 rotate in opposite directions; a washer 21 is also installed at the contact surface between the anti-rotation sleeve 6 and the assembly component 2, and the washer 21 is fitted onto the shank of the anti-rotation bolt 1. Simultaneously, a retaining ring groove 22 for installing a retaining ring is also provided on the shank of the anti-rotation bolt 1. Figure 4-5 (Not shown in the image) During assembly, the retaining ring 23 is placed between the two assembly parts 2, and then assembled with the anti-rotation bolt 1. After assembly, the outer ring surface of the retaining ring 23 contacts the assembly part 2, and the inner ring surface contacts the retaining ring groove 22.

[0036] The anti-rotation assembly structure provided by the present invention can prevent bolts from rotating during assembly. At the same time, the cooperation of the anti-rotation component, the pulling component and the locking sleeve can improve the reliability of assembly.

[0037] The above description is only a preferred embodiment of the present invention. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the principle of the present invention, and these improvements and modifications should also be considered within the scope of protection of the present invention.

Claims

1. A bolt anti-rotation assembly structure, characterized in that, include: The anti-rotation bolt has a surface structure at its head end that abuts against the assembly component, allowing it to be embedded in the anti-rotation groove at the screw hole of the assembly component; multiple anti-rotation grooves are provided on the outer rod body at the tail end along the axial direction. An anti-rotation sleeve, screwed onto an anti-rotation bolt, is used to fix and assemble components in conjunction with the anti-rotation bolt. It includes a threaded ring and a cylindrical body disposed on the outer end face of the threaded ring. The inner diameter of the cylindrical body is larger than the inner diameter of the screw and is coaxially arranged. Multiple countersunk grooves are correspondingly opened on the outer periphery of the threaded ring, and a sliding groove communicating with the interior of the cylindrical body is opened in each countersunk groove. Multiple anti-rotation components are correspondingly provided on the outer end face of the spiral ring located inside the cylinder; the anti-rotation component includes a positioning block installed on the spiral ring, and an anti-rotation rod hinged to the end of the positioning block away from the cylinder, and an anti-rotation block that fits into the anti-rotation groove is provided at the end of the anti-rotation rod. The ring body is also equipped with a traction assembly for pulling the anti-rotation rod. The traction assembly includes a sleeve fitted on the anti-rotation rod, a sliding rod that passes through the sink groove and the slide groove and is connected to the sleeve; a rubber sleeve is provided inside the sleeve, and a spring is fitted on the anti-rotation rod located between the sleeve and the positioning block; the diameter of the head of the sliding rod is larger than the diameter of the rod body, the head of the sliding rod is located outside the sink groove, and the rod body of the sliding rod can slide up and down and back and forth relative to the slide groove; and a spring is also fitted on the sliding rod to abut against the head of the sliding rod and the inside of the slide groove. It also includes: an upper locking sleeve, screwed onto the tail end of the anti-rotation bolt located outside the anti-rotation sleeve; the upper locking sleeve has an annular groove for the outer end of the cylinder to be inserted, and an inner annular surface with a convex structure and a sloped transition at the center hole of the upper locking sleeve. As the upper locking sleeve is gradually screwed onto the tail end of the anti-rotation bolt, the front end of the upper locking sleeve gradually comes into contact with the head of the sliding rod and the rod part located inside the cylinder, and pushes the sliding rod backward. The inner ring surface of the upper locking sleeve gradually comes into contact with the anti-rotation block and pushes the anti-rotation block into the anti-rotation groove.

2. The bolt anti-rotation assembly structure according to claim 1, characterized in that, The anti-rotation block has a square or spherical structure.

3. The bolt anti-rotation assembly structure according to claim 1, characterized in that, The tail end of the anti-rotation bolt has a double threaded section in both directions, and the anti-rotation sleeve and the upper locking sleeve rotate in opposite directions.

4. The bolt anti-rotation assembly structure according to claim 1, characterized in that, The spiral ring and the cylinder are an integral structure.

5. The bolt anti-rotation assembly structure according to claim 1, characterized in that, The assembly component with anti-rotation grooves is the rotor disk of an aircraft engine.

6. The bolt anti-rotation assembly structure according to claim 1, characterized in that, The assembly component with anti-rotation grooves is the casing of an aircraft engine.

7. The bolt anti-rotation assembly structure according to claim 1, characterized in that, A gasket is also installed at the contact surface between the anti-rotation sleeve and the assembly component, and the gasket is sleeved on the rod of the anti-rotation bolt.

8. The bolt anti-rotation assembly structure according to claim 1, characterized in that, The anti-rotation bolt also has a retaining ring groove for installing a retaining ring.

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