Internal snap ring grip type lock nut

Abstract

The utility model relates to a kind of inner collar holds tightly type locknut, belong to fastener technical field, it discloses the nut is combined by lower nut, upper nut and inner collar;The internal thread in the lower nut and upper nut is the internal thread of unified specification, the upper groove of the upper part of the lower nut body to upper end face is equipped with, the anti-rotation slot is equipped on the upper groove ring side wall of the upper groove;The lower groove of the lower part of the upper nut body to lower end face is equipped with;The inner collar is the ring gap collar with gap, and is divided into directly connected lower collar and upper collar, the outer ring wall of the lower collar is directly generated with anti-rotation card convex;Its beneficial effect is that upper and lower nut will hold tightly and be clamped in inner collar in upper and lower groove, the outer eccentric end head on inner collar will be clamped in stop groove and stop slot, so that upper nut and lower nut are mutually buckled by inner collar, so that nut overall cannot loosen.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of fasteners, in particular to an inner collar clamping type lock nut. BACKGROUND

[0002] Common fasteners include bolt-nut assemblies, stud-nut assemblies, screws, studs, etc. Among them, the nut is a polygonal column with a central threaded hole, and an inner thread is arranged on the inner ring wall of the central threaded hole. The inner thread is matched with the outer thread on the stud to be screwed tightly. The stud is a screw rod with a bolt head, and an outer thread is arranged on the screw rod for fastening and connecting two or more fastened parts with through holes.

[0003] After the nut is screwed on the screw rod, the fastening of the nut and the bolt is generally stable. However, if the fastened parts are in vibration for a long time, the vibration frequency difference between the connecting parts will exist, which will cause the connecting structure to have a reverse loosening tendency between the connecting parts, resulting in loosening or even falling off of the connection between the nut and the stud. Therefore, nylon lock nuts are widely used in current applications to avoid reverse loosening.

[0004] The existing nylon lock nut includes a nut body, an annular groove wall, a nylon sleeve ring, and a ring disc top wall. The nut body is provided with an inner threaded hole at the center. The annular groove wall and the ring disc top wall are respectively arranged at one end of the nut body and are integrally formed with the nut body. The nylon sleeve ring is arranged in the annular groove wall. Since nylon is relatively soft, the nylon sleeve ring in the annular groove wall is not easy to be compressed tightly, and even easy to produce rotation. The nylon sleeve ring is easy to be brittle and damaged after being used for a period of time, which reduces or even eliminates the locking function of the nylon lock nut, and the loosening and falling off phenomenon is easy to occur. SUMMARY

[0005] The present application aims to solve the above-mentioned defects by providing an inner collar clamping type lock nut, which is clamped tightly with each other and cannot be loosened, thereby improving the anti-loosening effect of the lock nut and prolonging the service life.

[0006] To solve the above-mentioned technical problems, the technical solution adopted by the present application is an inner collar clamping type lock nut, which includes a nut.

[0007] The inner threads in the lower nut and the upper nut are of the same specification, and both can be fastened on the same screw rod. An upper groove along for accommodating the lower part of the lower collar, i.e. the inner collar, is arranged on the upper part to the upper end surface of the inner ring wall of the lower nut body. A lower groove along for accommodating the upper part of the upper collar, i.e. the inner collar, is arranged on the lower part to the lower end surface of the inner ring wall of the upper nut body. The upper groove along on the lower nut and the lower groove along on the upper nut are different from each other, and the specific arrangements are as follows.

[0008] The upper groove in the lower nut comprises a ring bottom wall and an upper groove ring side wall, and the upper groove ring side wall is provided with an anti-rotation clamping groove for preventing the inner ring from rotating.

[0009] The lower groove in the upper nut comprises a ring top wall and a lower groove ring side wall, and the lower groove ring side wall is a conical frustum ring side wall, wherein the inner diameter at the position of the ring top wall is smaller than the inner diameter at the position of the lower end surface.

[0010] The inner ring is a notched ring made of elastic steel, which is divided into a lower ring and an upper ring connected directly, and the inner ring wall of the lower ring and the upper ring is a unified structure, and the inner diameter is equal to or slightly larger than the bottom diameter of the upper nut, so that the notched ring can freely pass through the fastened screw in the natural anti-loosening state; the outer ring wall of the lower ring and the upper ring has different structures, wherein the outer ring wall of the lower ring is directly provided with an anti-rotation clamping convex, which can be arranged at any position of the outer ring wall of the lower ring, preferably at the position opposite to the notch, the length of the lower ring is equal to the depth of the upper groove of the lower nut, the outer shape of the lower ring is cylindrical, the inner diameter of the cylindrical upper groove ring side wall of the upper groove of the lower nut is equal to the outer diameter of the lower ring, so that the lower ring can be stably fitted into the upper groove of the lower nut; the length of the upper ring is equal to the depth of the lower groove of the upper nut, the outer shape of the upper ring is conical frustum, the lower end outer diameter of the upper ring is slightly larger than the inner diameter of the lower groove ring side wall at the position of the lower end surface of the lower groove of the upper nut, the upper end outer diameter of the upper ring is slightly larger than the inner diameter of the lower groove ring side wall at the position of the ring top wall connected by the lower groove of the upper nut, and the conical inclination of the conical frustum of the upper ring is equal to the conical inclination of the conical lower groove ring side wall in the lower groove of the upper nut; for the sake of brevity, this feature will be described as the inner diameter of the lower groove is slightly smaller than the outer diameter of the upper ring.

[0011] In this paper, slightly larger means 0.1%-10% larger than the target, and slightly smaller means 0.1%-10% smaller than the target.

[0012] In this paper, the outer diameter or inner diameter of the inner ring or the upper ring or the lower ring refers to the outer diameter or inner diameter of the notched ring made of elastic steel in the natural state without being compressed.

[0013] The inner wall surface of the ring-lacking clamping ring can be provided with four different structures. One is a smooth surface. When the inner wall surface of the ring-lacking clamping ring is a smooth surface, the inner diameter of the ring-lacking clamping ring is equal to or slightly larger than the root diameter of the internal thread of the upper nut in the natural anti-loosening state, so that the ring-lacking clamping ring can freely pass through the fastened screw in the natural anti-loosening state. The second is a smooth surface with vertical clamping strips. When the inner wall surface of the ring-lacking clamping ring is a smooth surface with vertical clamping strips, the inner diameter of the ring-lacking clamping ring is equal to or slightly larger than the root diameter of the upper nut in the natural anti-loosening state, so that the ring-lacking clamping ring can be screwed into and fastened on the screw in the natural anti-loosening state. The third is an internal thread surface. When the inner wall surface of the ring-lacking clamping ring is an internal thread surface, the internal thread specification of the ring-lacking clamping ring is the same as that of the upper nut in the natural anti-loosening state, so that the ring-lacking clamping ring can be screwed into and fastened on the screw in the natural anti-loosening state. The fourth is an internal thread surface provided with vertical grooves. When the inner wall surface of the ring-lacking clamping ring is an internal thread surface provided with vertical grooves, the internal thread specification of the ring-lacking clamping ring is the same as that of the upper nut in the natural anti-loosening state, so that the ring-lacking clamping ring can be screwed into and fastened on the screw in the natural anti-loosening state.

[0014] In use, the lower clamping ring of the ring-lacking clamping ring is first placed in the upper groove of the lower nut, and the anti-rotation clamping convex is inserted into the anti-rotation clamping groove, then the upper groove of the lower nut is directed in the opposite direction of the screw, and the lower nut is screwed onto the screw together with the ring-lacking clamping ring, and then the lower groove of the upper nut is directed to the inside of the screw, and the upper nut is screwed onto the screw and the upper clamping ring of the ring-lacking clamping ring is tightly clamped in the lower groove. In this process, the lower groove will gradually tighten the ring-lacking clamping ring because the inner diameter of the lower groove is slightly smaller than the outer diameter of the upper clamping ring, so that the ring-lacking clamping ring is tightened and tightly clamped on the screw, and the nut cannot be loosened as a whole.

[0015] The minimum width of the notch on the inner clamping ring is at least capable of making the inner diameter of the ring-lacking clamping ring formed after the notch is closed smaller than the root diameter of the internal thread of the upper nut, so that the inner clamping ring can tightly clamp the screw after the ring-lacking clamping ring is tightened by the upper nut.

[0016] Further, the upper groove ring side wall of the upper groove of the lower nut is provided with a retreat-preventing groove position, the groove wall on one side of the tightening direction is an inclined groove wall, and the groove wall on one side of the loosening direction is a vertical groove wall; the lower groove ring side wall of the upper nut is provided with a plurality of evenly distributed retreat-preventing clamping grooves, the groove wall on one side of the tightening direction is an inclined groove wall, and the groove wall on one side of the loosening direction is a vertical groove wall; the outwardly inclined end head of the missing end head on one side of the tightening direction of the ring missing clamping ring is outwardly inclined to form an outwardly inclined end head; in use, first, the lower clamping ring of the ring missing clamping ring is placed in the upper groove of the lower nut, the anti-rotation clamping convex is inserted into the anti-rotation clamping groove, and the outwardly inclined end head on one side of the lower clamping ring is placed in the retreat-preventing groove position, then the upper groove of the lower nut is rotated in the direction opposite to the screw rod, the lower nut is tightened on the screw rod together with the ring missing clamping ring, the lower groove of the upper nut is rotated in the direction of the screw rod, the upper nut is tightened on the screw rod, and the upper clamping ring of the ring missing clamping ring is tightly clamped in the lower groove; in this process, because the inner diameter of the lower groove is slightly smaller than the outer diameter of the upper clamping ring, the lower groove will gradually tighten the ring missing clamping ring, so that the ring missing clamping ring is tightened and tightly clamped on the screw rod, and the outwardly inclined end head of the ring missing clamping ring is clamped in one of the plurality of retreat-preventing clamping grooves, so that the upper nut cannot be rotated in the opposite direction, and the upper and lower nuts cannot be loosened as a whole.

[0017] Further, the upper groove ring side wall of the upper groove of the lower nut is provided with a retreat-preventing groove position, the groove wall on one side of the tightening direction is an inclined groove wall, and the groove wall on one side of the loosening direction is a vertical groove wall; the lower groove ring side wall of the upper nut is provided with a plurality of evenly distributed retreat-preventing clamping grooves, the groove wall on one side of the tightening direction is an inclined groove wall, and the groove wall on one side of the loosening direction is a vertical groove wall; the outwardly inclined end head of the missing end head on one side of the tightening direction of the ring missing clamping ring is outwardly inclined to form an outwardly inclined end head; in use, first, the lower clamping ring of the ring missing clamping ring is placed in the upper groove of the lower nut, the anti-rotation clamping convex is inserted into the anti-rotation clamping groove, and the outwardly inclined end head on one side of the lower clamping ring is placed in the retreat-preventing groove position, then the upper groove of the lower nut is rotated in the direction opposite to the screw rod, the lower nut is tightened on the screw rod together with the ring missing clamping ring, the lower groove of the upper nut is rotated in the direction of the screw rod, the upper nut is tightened on the screw rod, and the upper clamping ring of the ring missing clamping ring is tightly clamped in the lower groove; in this process, because the inner diameter of the lower groove is slightly smaller than the outer diameter of the upper clamping ring, the lower groove will gradually tighten the ring missing clamping ring, so that the ring missing clamping ring is tightened and tightly clamped on the screw rod, and the outwardly inclined end head of the ring missing clamping ring is clamped in one of the plurality of retreat-preventing clamping grooves, so that the upper nut cannot be rotated in the opposite direction, and the upper and lower nuts cannot be loosened as a whole.

[0018] Further, the upper groove ring side wall of the upper groove of the lower nut is provided with a retreat-preventing groove position, the groove wall on one side of the tightening direction is an inclined groove wall, and the groove wall on one side of the loosening direction is a vertical groove wall; the lower groove ring side wall of the upper nut is provided with a plurality of evenly distributed retreat-preventing clamping grooves, the groove wall on one side of the tightening direction is an inclined groove wall, and the groove wall on one side of the loosening direction is a vertical groove wall; the outwardly inclined end head of the missing end head on one side of the tightening direction of the ring missing clamping ring is outwardly inclined to form an outwardly inclined end head; in use, first, the lower clamping ring of the ring missing clamping ring is placed in the upper groove of the lower nut, the anti-rotation clamping convex is inserted into the anti-rotation clamping groove, and the outwardly inclined end head on one side of the lower clamping ring is placed in the retreat-preventing groove position, then the upper groove of the lower nut is rotated in the direction opposite to the screw rod, the lower nut is tightened on the screw rod together with the ring missing clamping ring, the lower groove of the upper nut is rotated in the direction of the screw rod, the upper nut is tightened on the screw rod, and the upper clamping ring of the ring missing clamping ring is tightly clamped in the lower groove; in this process, because the inner diameter of the lower groove is slightly smaller than the outer diameter of the upper clamping ring, the lower groove will gradually tighten the ring missing clamping ring, so that the ring missing clamping ring is tightened and tightly clamped on the screw rod, and the outwardly inclined end head of the ring missing clamping ring is clamped in one of the plurality of retreat-preventing clamping grooves, so that the upper nut cannot be rotated in the opposite direction, and the upper and lower nuts cannot be loosened as a whole.

[0019] ①: Use two wrenches or other tools to clamp the upper nut and the lower nut respectively.

[0020] ②: Keep the lower nut stable, and slightly twist the upper nut in the loosening direction with force, so that the pressure surface can press the outwardly inclined end head, and the outwardly inclined end head can be separated from the retreat-preventing groove position and the retreat-preventing clamping groove.

[0021] ③: Then twist the two wrenches to the loosening direction slightly, and twist the nut as a whole in the reverse direction to loosen it.

[0022] Since two wrenches are needed in this loosening method, the wrench that clamps the upper nut needs to be loosened first, and then the two wrenches that clamp the upper and lower nuts respectively are loosened simultaneously to loosen the nut, so it is impossible to loosen the nut as a whole under natural vibration.

[0023] When the outer offset end is arranged on the ring gap ring, the inner wall surface of the ring gap ring is still a smooth surface or a smooth surface with vertical clamping strips or an internal thread surface or an internal thread surface with vertical grooves.

[0024] Further, the corner position of the upper groove ring side wall of the upper groove along and the lower end surface of the upper nut is arranged as a round corner transition surface, the corner position of the upper groove ring side wall of the upper groove along and the lower end surface of the lower nut is arranged as a round corner transition surface, and the transition position of the upper and lower end surfaces and the side surface of the inner clamping ring is arranged as a round corner transition surface, which can be arranged respectively or simultaneously, to facilitate installation.

[0025] Compared with the prior art, the present application has the following beneficial effects.

[0026] ⑴The nut is divided into an upper nut, an inner clamping ring and a lower nut in a combined structure, and a lower groove along and an upper groove along are arranged in the upper and lower nuts respectively, the inner clamping ring is clamped tightly and clamped against the upper and lower groove along, so that the nut cannot be loosened.

[0027] ⑵An outer offset end is arranged on the inner clamping ring, a retreat prevention groove is arranged on the lower nut, and a retreat prevention clamping groove is arranged on the upper nut, after tightening, the outer offset end is clamped in the retreat prevention groove and the retreat prevention clamping groove, so that the upper nut and the lower nut are clamped by the inner clamping ring, and cannot be loosened.

[0028] ⑶A pressing inclined surface is arranged on the upper nut, when disassembly is needed, the upper nut is slightly tightened in the tightening direction, the outer offset end is pressed on the pressing inclined surface, the outer offset end is separated from the retreat prevention groove and the retreat prevention clamping groove, then the upper nut and the lower nut are rotated in the reverse direction, and the nut as a whole can be rotated out. BRIEF DESCRIPTION OF DRAWINGS

[0029] Figure 1 It is an exploded structural schematic view of the inner clamping ring of the present application.

[0030] Figure 2 It is a perspective structural schematic view of the lower nut in the present application.

[0031] Figure 3 It is a perspective structural schematic view of the upper nut in the present application.

[0032] Figure 4 It is a perspective structural schematic view of the inner clamping ring in the present application.

[0033] Figure 5 The oblique view structure diagram of the lower nut provided with the retreat-stop groove in the application.

[0034] Figure 6 The oblique view structure diagram of the upper nut provided with the retreat-stop slot in the application.

[0035] Figure 7 The structure diagram of the end of the notch end of the tightening direction of the inner ring being provided with the outer offset end in the application, and the structure diagram of the inner ring provided with the inner thread and the vertical slot.

[0036] Figure 8 The structure diagram of the inner ring clamping type lock nut being tightened on the screw rod in the application.

[0037] In the figure: 1. Lower nut, 2. Upper nut, 3. Inner ring, 4. Upper groove side, 5. Lower groove side, 6. Ring bottom wall, 7. Upper groove ring side wall, 8. Anti-rotation clamping slot, 9. Ring top wall, 10. Lower groove ring side wall, 11. Notch, 12. Lower ring, 13. Upper ring, 14. Anti-rotation clamping convex, 15. Retreat-stop groove, 16. Retreat-stop slot, 17. Outer offset end, 18. Compression curved surface, 19. Locking groove, 20. Locking ring, 21. Round corner transition surface, 22. Vertical slot, 23. Offset angle outer offset end. DETAILED DESCRIPTION

[0038] The application will be further described below in conjunction with the embodiments, which are intended to illustrate the application rather than further limit the protection scope of the application, and should not limit the protection scope of the application.

[0039] Example 1.

[0040] As shown in Figure 1 , 2 , 3, 4, an inner ring clamping type lock nut is made, which is composed of a lower nut 1, an upper nut 2 and an inner ring 3.

[0041] The inner threads in the lower nut 1 and the upper nut 2 are inner threads of uniform specification, which can be fastened on the same screw rod, the upper part of the lower nut 1 body to the upper end face is provided with an upper groove side 4 for accommodating the lower ring 12 of the lower part of the inner ring, the lower part of the upper nut 2 body to the lower end face is provided with a lower groove side 5 for accommodating the upper ring 13 of the upper part of the inner ring, the upper groove side 4 on the lower nut 1 and the lower groove side 5 on the upper nut 2 are different, and the specific embodiments are as follows.

[0042] The upper groove side 4 includes a ring bottom wall 6 and an upper groove ring side wall 7, the upper groove ring side wall 7 is provided with an anti-rotation clamping slot 8 for preventing the rotation of the inner ring 3, and the upper groove ring side wall 7 is a cylindrical ring side wall.

[0043] The lower groove along 5 comprises a ring top wall 9 and a lower groove ring side wall 10, which is a conical frustum ring side wall, the inner diameter of which at the position of the ring top wall is smaller than the inner diameter at the position of the lower end surface.

[0044] The inner ring 3 is a ring with a notch 11 made of elastic steel material, which is divided into a lower ring 12 and an upper ring 13 connected directly, the inner ring wall of the lower ring 12 and the upper ring 13 is of a uniform structure, the inner diameter of which is equal to or slightly larger than the bottom diameter of the lower nut 1 or the upper nut 2, and the inner ring can freely pass through the fastened screw when it is in a natural anti-loose state; the outer ring wall of the lower ring 12 and the upper ring 13 has different structures, wherein the outer ring wall of the lower ring 12 directly generates an anti-rotation lug 14, which can be arranged at any position of the outer ring wall of the lower ring 12, and in the embodiment, it is arranged at the position opposite to the notch 11, the length of the lower ring 12 is equal to the depth of the upper groove along 4 on the lower nut 1, and the outer shape of the lower ring 12 is cylindrical, when the outer shape of the lower ring 12 is cylindrical, the upper groove along 4 on the lower nut 1 also has a cylindrical upper groove ring side wall 7, the inner diameter of which is equal to the outer diameter of the lower ring, that is, the inner diameter of the cylindrical upper groove ring side wall 7 of the upper groove along 4 on the lower nut is equal to the outer diameter of the lower ring 12, so that the lower ring 12 can be stably inserted into the upper groove along 4 on the lower nut 1; the length of the upper ring 13 is equal to the depth of the lower groove along 5 on the upper nut 2, and the outer shape of the upper ring 13 is conical frustum, the lower end outer diameter of the upper ring 13 is slightly larger than the inner diameter of the lower groove ring side wall 10 of the lower groove along 5 on the lower nut 2 at the position of the lower end surface, the upper end outer diameter of the upper ring 13 is slightly larger than the inner diameter of the lower groove ring side wall 10 of the lower groove along 5 on the lower nut 2 at the position of the ring top wall 9, and the conical inclination of the conical frustum of the upper ring 13 is equal to the conical inclination of the conical lower groove ring side wall 10 in the lower groove along 5 on the upper nut 2.

[0045] In the above, the minimum width of the notch 11 on the inner ring 3 is at least capable of making the inner diameter of the notch-free circular ring formed by folding the notch 11 on the inner ring 3 smaller than the top diameter of the internal thread of the lower nut 1 or the upper nut 2, so that the inner ring 3 can tightly hold the screw after being clamped by the upper nut 2.

[0046] In the above, the inner wall surface of the inner collar 3 can be provided with four different structures, one of which is a smooth surface. When the inner wall surface of the inner collar 3 is a smooth surface, in the natural anti-loosening state, the inner diameter of the inner collar 3 is equal to or slightly larger than the root diameter of the upper nut 2, so that the inner collar 3 can freely pass through the fastened screw in the natural anti-loosening state. The second structure is a smooth surface with vertical clamping strips. When the inner wall surface of the inner collar 3 is a smooth surface with vertical clamping strips, in the natural anti-loosening state, the inner circle formed by the top ends of the vertical clamping strips is equal to or slightly larger than the root diameter of the upper nut 2, so that the inner collar 3 is screwed into and fastened on the screw in the natural anti-loosening state. The third structure is an inner threaded surface. When the inner wall surface of the inner collar 3 is an inner threaded surface, in the natural anti-loosening state, the inner thread specification of the inner collar 3 is the same as that of the upper nut 2, so that the inner collar 3 is screwed into and fastened on the screw in the natural anti-loosening state. The fourth structure is an inner threaded surface provided with vertical grooves 21. When the inner wall surface of the inner collar 3 is an inner threaded surface provided with vertical grooves, in the natural anti-loosening state, the inner thread specification of the inner collar 3 is the same as that of the upper nut 2, so that the inner collar 3 is screwed into and fastened on the screw in the natural anti-loosening state.

[0047] In use, first, the lower collar 12 of the inner collar 3 is placed in the upper groove guide 4 of the lower nut 1, and the anti-rotation clamping protrusion 14 is inserted into the anti-rotation clamping groove 8, then the upper groove guide 4 of the lower nut 1 is moved in the direction opposite to the screw, and the lower nut 1 is screwed onto the screw together with the inner collar 3, then the lower groove guide 5 of the upper nut 2 is moved towards the inside of the screw, and the upper nut 2 is screwed onto the screw and the upper collar 13 of the inner collar 3 is tightly clamped in the lower groove guide 5. In this process, since the inner diameter of the lower groove guide 5 is slightly smaller than the outer diameter of the upper collar 13, the lower groove guide 5 gradually tightens the inner collar 3, so that the inner collar 3 is tightly clamped on the screw, and the nut cannot be loosened as a whole.

[0048] Example 2.

[0049] Further, as Figure 5 , 6, 7, on the basis of example 1, the upper groove of the lower nut 1 is provided with a retreat-preventing groove position 15 on the upper groove ring side wall 7 of the upper groove 4, the groove wall on the side of the tightening direction is an inclined groove wall, and the groove wall on the side of the loosening direction is a vertical groove wall; the lower groove of the upper nut 1 is provided with a plurality of evenly distributed retreat-preventing clamping grooves 16 on the lower groove ring side wall 10 of the lower groove 5, the groove wall on the side of the tightening direction is an inclined groove wall, and the groove wall on the side of the loosening direction is a vertical groove wall; the end of the notch position on the side of the tightening direction of the inner clamping ring 3 is outwardly inclined to form an outwardly inclined end 17; in use, the lower clamping ring 12 of the inner clamping ring 3 is first placed in the upper groove 4 of the lower nut 1, the anti-rotation clamping protrusion 14 is inserted into the anti-rotation clamping groove 8, and the outwardly inclined end 17 on the side of the lower clamping ring is inserted into the retreat-preventing groove position 15, then the upper groove 4 on the lower nut 1 is rotated in the direction opposite to the screw, the lower nut 1 is tightened on the screw together with the inner clamping ring 3, the lower groove 5 on the upper nut 2 is rotated in the direction of the screw, the upper nut 2 is tightened on the screw, and the upper clamping ring 13 of the inner clamping ring 3 is tightly clamped in the lower groove 5, in this process, because the inner diameter of the lower groove 5 is slightly smaller than the outer diameter of the upper clamping ring 13, the lower groove 5 will gradually tighten the inner clamping ring 3, so that the inner clamping ring 3 is tightened and tightly clamped on the screw, and the outwardly inclined end 17 on the inner clamping ring 3 is clamped into one of the plurality of retreat-preventing clamping grooves 16, so that the upper nut 2 cannot be rotated in the opposite direction, and the upper and lower nuts cannot be loosened as a whole.

[0050] Further, the upper groove ring side wall 7 of the upper groove 4 of the lower nut 1 is preferably provided with a slightly inwardly recessed locking groove 19 at a position close to the outer end face, and the outer ring wall of the lower clamping ring 12 is preferably provided with a slightly outwardly protruding locking ring 20 at a position close to the upper clamping ring 13, in use, the inner clamping ring 3 is slightly clamped to insert the lower clamping ring 12 into the upper groove 4 of the lower nut 1, and the locking ring 20 is clamped in the locking groove 19, so that the inner clamping ring 3 is not easy to be pulled out of the upper groove 4, this operation needs force, therefore the company completes this operation when the product is shipped; the locking groove 19 and the locking ring 20 can be interchanged on the upper groove ring side wall 7 and the lower clamping ring 12.

[0051] Further, the lower groove ring side wall 10 of the lower groove 5 on the upper nut 2 is provided with a round corner transition surface 21 at the corner position of the lower end face of the upper nut 2, the upper groove ring side wall 7 of the upper groove 4 of the lower nut 1 is provided with a round corner transition surface at the corner position of the upper end face of the lower nut 1, and the upper and lower end faces and the side faces of the inner clamping ring 3 are all provided with round corner transition surfaces 21, to facilitate installation.

[0052] Example 3.

[0053] Further, the convex surface between the two adjacent stop-retaining grooves 16 on the lower groove ring side wall 10 of the upper nut 2 is provided with a slightly inwardly concave and outwardly inclined pressing curved surface 18, and the outer bias end head 17 at the position of the upper retaining ring 13 is also provided with a slightly inwardly inclined bias angle outer bias end head 23. In this way, under the action of a large external force, the pressing curved surface 18 can make the outer bias end head 17 as a whole separate from the stop-retaining groove 15 on the lower nut 1 and the stop-retaining groove 16 on the upper nut 2 when it presses the bias angle outer bias end head 23. When it is necessary to unscrew the nut, only the following steps need to be followed to complete the operation.

[0054] ①: Two wrenches or other tools are used to clamp the upper nut 2 and the lower nut 1 respectively.

[0055] ②: The lower nut 1 is kept stable, and the upper nut 2 is slightly twisted in the loosening direction, so that the pressing curved surface 18 presses the bias angle outer bias end head 23, and the outer bias end head 17 as a whole separates from the stop-retaining groove 15 and the stop-retaining groove 16.

[0056] ③: Then twist the two wrenches in the loosening direction at the same time, and twist the nut as a whole in the reverse direction to unscrew it.

[0057] Since this unscrewing method requires two wrenches, the wrench clamping the upper nut 2 needs to be loosened first, and then the two wrenches clamping the upper nut 2 and the lower nut 1 are loosened at the same time to unscrew the nut. Therefore, it is not possible to unscrew the nut as a whole under natural vibration conditions.

Claims

1. An inner clamping ring locking type anti-loosening nut, comprising a lower nut (1), an upper nut (2) and an inner clamping ring (3), characterized in that: An upper groove edge (4) is provided on the upper portion of the lower nut (1), and the upper groove edge (4) includes an upper groove ring side wall (7), and the upper groove ring side wall (7) is a cylindrical ring side wall; A lower groove edge (5) is provided at the lower portion of the upper nut (2), and the lower groove edge (5) includes a lower groove ring side wall (10), and the lower groove ring side wall (10) is a frustoconical ring side wall; The inner retaining ring (3) comprises: A lower clamping ring (12) having a cylindrical outer shape, wherein the length of the lower clamping ring (12) is equal to the depth of the upper groove edge (4), and the outer diameter of the lower clamping ring (12) is equal to the inner diameter of the upper groove edge (4); An upper collar (13) having a length equal to the depth of the lower groove edge (5); The upper clamping ring (13) is in the shape of a truncated cone, and its inclination matches the conical inclination of the lower groove edge (5); The inner clamping ring (3) is a ring-notch clamping ring having a notch (11), and the width of the notch (11) of the inner clamping ring (3) satisfies: the inner diameter formed after closing is smaller than the crest diameter of the internal thread of the upper nut (2); A stop groove (15) is provided on the upper groove ring side wall (7) of the upper groove edge 4 of the lower nut (1), and the groove wall of the stop groove (15) on the tightening direction side is an inclined groove wall, and the groove wall on the loosening direction side is a vertical groove wall; a plurality of evenly distributed stop grooves (16) are provided on the lower groove ring side wall (10) of the lower groove edge (5) of the upper nut (2), and a compression curved surface (18) that is inwardly concave and outwardly inclined is provided between two adjacent stop grooves (16); the end of the notch position of the inner clamping ring (3) on the tightening direction side is deflected outward to form an outwardly deflected end (17), and the outwardly deflected end (17) located at the upper clamping ring (13) is provided as an inwardly deflected outwardly deflected end (23).

2. The inner-ring-tightening anti-loosening nut according to claim 1, characterized in that: The inner wall surface of the inner clamping ring (3) is one of the following structures: (a) Smooth surface; (b) a smooth surface with vertical clips; (c) internal thread surface; (d) Internal thread surface with vertical grooves.

3. The inner-ring-tightening anti-loosening nut according to claim 2, characterized in that: An inwardly recessed locking groove (19) is provided on the upper groove ring side wall (7) of the upper groove edge (4) of the lower nut (1), and an outwardly protruding locking ring (20) is provided on the outer ring wall of the lower clamping ring (12).

4. The inner-ring-tightening anti-loosening nut according to claim 3, characterized in that: The corner position between the lower groove ring side wall (10) on the lower groove edge (5) and the lower end surface of the upper nut (2) is set as a rounded transition surface, the corner position between the upper groove ring side wall (7) on the upper groove edge (4) and the upper end surface of the lower nut (1) is set as a rounded transition surface, and the transition positions between the upper and lower end surfaces and the side surfaces of the inner retaining ring (3) are all set with rounded transition surfaces.

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