CN218882738U - Anti-theft locknut assembly - Google Patents

Abstract

The utility model discloses a theftproof locknut subassembly, nut and tightring gasket including the cooperation use. The nut body is in a shape of a round sky and a square earth, and the thin-wall wing ring and the nut body are integrally connected at the square earth. The outer circle of the thin-wall wing ring is in interference fit with the inner hole of the tight ring gasket, and the interference magnitude is not larger than the clearance between the inner thread and the outer thread. The utility model discloses utilize the deformation of thin wall wing ring to realize locking. The place is odd square, must use special spanner to realize preventing burglary, perhaps utilizes the locking effect of sky circle place structure and increase moment of torsion to realize preventing burglary.

Description

Anti-theft locknut assembly

Technical Field

The utility model discloses be applied to the fastener trade, relate to fastening nut, especially a nut component with locking function of theftproof.

Background

Usually, the nut adopts pretightening force, utilizes the elastic deformation of screw thread, or adopts the elastic gasket, utilizes the elasticity of elastic gasket, increases the frictional force between interior external screw thread, plays the effect that prevents the nut not hard up. However, after long-term use, the pre-tightening force of the nut or the elastic force of the elastic gasket can be gradually reduced, so that the nut is loosened. For this reason, a patent for a different structure of the anti-loosening nut is applied. The publication number CN111306174A provides a thread anti-loosening double nut which comprises a main nut and an auxiliary nut and a sleeve, wherein the left and right screwing directions of the threads of the main nut and the auxiliary nut are opposite, hexagonal prism surfaces of the main nut and the auxiliary nut are tightly sleeved by the sleeve, the main nut and the auxiliary nut are firmly combined into a whole, and the main nut and the auxiliary nut can not loosen for a long time under extreme working conditions such as vibration, impact and variable load. Publication number CN113803354a discloses a male and female locknut with a mortise, tenon and wedge structure, wherein a wedge is provided with an internal thread as a female nut, the mortise is provided with an internal thread as a male nut, the tenon is provided with an external thread, or the wedge is provided with an internal thread as a male nut, the mortise is provided with an internal thread as a female nut, the tenon is provided with an external thread, the female nut is firstly used for fastening an object, then the male nut and the female nut are driven to mutually extrude, the female nut has larger deformation and smaller deformation, the female nut has deformation to prevent the male nut from turning, and/or the female nut has deformation to press the bolt to prevent the female nut from turning, so that the male nut and the female nut are locked on the bolt, and the male nut and the female nut return to the original state after disassembly. Publication number CN113983062a provides a shrink locknut assembly, which comprises a wedge nut, a nut and a bolt, wherein the nut is mounted on the bolt, a protrusion is rotated by the wedge nut and inserted into a gap between a nut body and the nut body, the nut body prevents the protrusion from moving outwards, thrust of the inner diameter of the protrusion presses the nut body, the nut body bends inwards to shrink, and threads on the nut body press the bolt to increase friction force to be locked. When the nut is disassembled, the mortise nut is fixed by using a spanner, the wedge nut is driven to retreat and rotate, the protrusion is pulled out of the gap between the nut body and the nut body, the nut body is restored to the original state, the wedge nut is disassembled, then the mortise nut is driven to retreat and rotate, and the mortise nut is disassembled. Publication number CN114776690a discloses a locking nut assembly, a first nut and a second nut cooperate to lock a bolt. The inner wall and the outer wall of the first nut are both provided with threads, and the thread pitches of the internal thread and the external thread are different; the inner wall of a second nut body of the second nut is provided with a secondary thread, and the secondary thread comprises a first-stage thread and a second-stage thread; the thread specifications of the bolt, the internal thread of the first nut and the first-stage thread of the second nut are the same, and the thread specifications of the external thread of the first nut and the second-stage thread of the second nut are the same. After the first nut is connected with the second nut, because the internal thread of the first nut is different from the thread regulation of the external thread, the two nuts are clamped on the bolt along the axial pressure and friction force of the bolt, and the nuts are effectively prevented from loosening and falling. The nut is anti-loose in structure, complex in structure and high in manufacturing cost.

The nut fastener used in the power industry and the like has huge use amount, and the anti-theft function of the nut fastener is gradually necessary due to the outdoor environment. For the anti-theft nut, a special tool is mostly used for anti-theft, for example, the notice number is CN2343416Y, CN2388399Y, CN87205352U, CN212899300U, and the like, and a circular structure is also used for anti-theft, for example, the notice number is CN2934715Y, CN2924136Y, CN2771554Y, and the like. The notice number CN2767738Y adopts an anti-theft shield to prevent theft outside the nut, the notice number CN2677690Y adopts a structure which can only advance and can not retreat to prevent theft, and the notice number CN2477888Y is the same as the notice number CN2767738Y, only can advance and can not retreat, can be used for only one time, and can not be loosened.

There are also a lot of anti-theft locknut patent applications, such as the publication number CN2084532U, which uses an anti-theft lockcover outside the nut to realize anti-theft and anti-loosing. CN2856559Y adopts knurling to increase locking effect, utilizes the recess to realize the theftproof. CN2690652Y uses eccentric wheel and jump ring inside two main and auxiliary nuts to realize anti-loose and anti-theft, and has a complex structure. The marble and spring in CN2649854Y are more complex in structure and are not suitable for nut screw installation.

SUMMERY OF THE UTILITY MODEL

The utility model provides a technical problem be: the anti-theft locknut assembly is simple in structure and low in manufacturing cost, increases the anti-loosening torque by means of deformation, and achieves anti-theft by means of a special wrench or the anti-loosening torque.

The utility model adopts the technical proposal that: the anti-theft locknut assembly comprises a nut and a fastening ring gasket which are matched for use. The nut comprises a nut body and a thin-wall wing ring, the nut body is in a round-sky shape, and the thin-wall wing ring and the nut body are integrally connected in the place. The excircle of the thin-wall wing ring is in interference fit with the inner hole of the gasket of the clamping ring, and the interference magnitude is not greater than the clearance between the internal thread and the external thread.

Further, the place is a regular triangle, a regular pentagon, a regular heptagon, or a regular tetragon, or a regular hexagon.

Furthermore, notches are symmetrically and uniformly distributed on the thin-wall wing ring, and the number of the notches is 2-4. The width of the gap is not less than the diameter difference between the excircle of the thin-wall wing ring and the inner hole of the tight ring gasket.

Furthermore, in order to facilitate the deformation of the thin-wall wing ring, the notch extends to the connecting surface of the nut body and the thin-wall wing ring.

Furthermore, in order to facilitate the positioning of the tight ring gasket and the installation of the nut, an outer chamfer is processed at the lower end of the thin-wall wing ring, and an inner chamfer matched with the outer chamfer is processed on the tight ring gasket.

Furthermore, the excircle of the thin-wall wing ring is an external conical surface, and the inner hole of the tight ring gasket is an internal conical surface matched with the external conical surface. The cone angle of the inner conical surface is 3-8 degrees larger than that of the outer conical surface.

The utility model has the advantages that: the utility model discloses utilize the deformation of thin wall wing ring to realize locking. The anti-theft device adopts a combination of a hemispherical dome structure and a deformed thin-wall wing ring or adopts regular and odd deformation, and only a special spanner can be used to realize the anti-theft.

Drawings

FIG. 1 is a schematic view of a nut according to embodiment 1;

FIG. 2 is a top view of FIG. 1;

FIG. 3 isbase:Sub>A cross-sectional view A-A of FIG. 2;

FIG. 4 is a schematic view of the installation structure of embodiment 1;

FIG. 5 is a schematic view of the structure of a nut according to embodiment 2;

FIG. 6 is a top view of FIG. 5;

FIG. 7 is a schematic view of a gasket of a tensioner of embodiment 2;

FIG. 8 is a schematic view of a nut according to embodiment 3;

FIG. 9 is a top view of FIG. 8;

FIG. 10 is a schematic view of a nut according to embodiment 4;

FIG. 11 is a top view of FIG. 10;

reference numerals: 1-nut body, 2-thin wall wing ring, 3-outer chamfer, 4-gap, 5-tight ring gasket, 6-inner chamfer, 7-screw, 8-through hole, 9-outer conical surface and 10-inner conical surface.

Detailed Description

The following upper and lower parts of the present invention refer to the upper and lower parts of fig. 1, fig. 3, fig. 4, fig. 5, fig. 8 and fig. 10, which are only for convenience of description and are not intended to be limiting.

Example 1.

The anti-theft anti-loose nut assembly comprises a nut and a tightening ring gasket 5 which are matched with each other, the structure of the nut is shown in figures 1-3, and the fastening use state is shown in figure 4.

The nut comprises a nut body 1 and a thin-wall wing ring 2 which are of an integral structure, wherein the nut body 1 is arranged at the upper part, the thin-wall wing ring 2 is arranged at the lower part, and internal threads in an inner hole of the nut are formed in one step. The shape of the nut body 1 is a hemispherical dome, the square of the embodiment is the following five squares, and a threaded hole is machined in the center of the hemispherical dome. The nut with the shape of the regular pentagon can be screwed or loosened only by matching the special spanner with the inner pentagon, and the universal spanner cannot be matched for use, so that the antitheft effect is achieved. The shape of the round top and the round bottom has the second function, namely, the inner square of the special spanner is conveniently and closely matched with the outer square of the nut, the inner square can be smoothly sleeved into the outer square along the inclination and the arc surface, the alignment operation of the pentagonal corners is not needed, and the quick matching screwing operation is realized; and secondly, the arc conical surface at the upper part can reduce the action area of the flexible chain wrench, and the nut cannot be rotated even if the flexible chain wrench is adopted, so that the anti-theft effect is further achieved. The thin-wall wing ring 2 is in a thin-wall cylindrical shape, two notches 4 which are symmetrically and uniformly distributed are processed on the thin-wall wing ring 2, and the notches 4 extend to the connecting surface of the nut body 1 and the thin-wall wing ring 2. The closer the indentation 4 is to the lower surface, the better its deformability is. The thin-wall wing ring 2 is in interference fit with the tight ring gasket 5, in order to facilitate the accurate fit of the thin-wall wing ring 2 with the tight ring gasket 5, an outer chamfer 3 is processed on the thin-wall wing ring 2, and an inner chamfer 6 is processed in an inner hole of the tight ring gasket 5.

When the screw 7 is fastened, as shown in fig. 4, the screw 7 extends out of the through hole 8 and is firstly sleeved into the tight ring gasket 5, and the thin-wall wing ring 2 of the nut is screwed into the screw 7 downwards towards the tight ring gasket 5. The outer chamfer 3 on the thin-wall wing ring 2 is matched with the inner chamfer 6 of the tight ring gasket 5, so that the tight ring gasket 5 can be quickly positioned, and the thin-wall wing ring 2 is conveniently matched with the tight ring gasket 5 well. The excircle of the thin-wall wing ring 2 is in interference fit with the inner hole of the tight ring gasket 5, and the radius difference between the excircle of the thin-wall wing ring and the tight ring gasket is equal to e marked in figure 4, and the e is not larger than the gap between the internal thread of the nut and the external thread of the screw rod 7. After the thin-wall wing ring 2 contacts the inner hole of the tightening ring gasket 5, the nut drives the tightening ring gasket 5 to rotate together under the action of friction force. When the tight ring gasket 5 contacts the workpiece, the nut is continuously screwed, the thin-wall wing ring 2 is inserted into the tight ring gasket 5, and the thin-wall wing ring 2 deforms and contracts inwards due to the constraint of the tight ring gasket 5. The deformation space of the thin-wall wing ring 2 is reserved in the gap 4, the width of the gap 4 is not smaller than the diameter difference between the excircle of the thin-wall wing ring 2 and the inner hole of the tight ring gasket 5, and is not smaller than 2e, so that the thin-wall wing ring 2 can be completely inserted into the tight ring gasket 5. When the thin-wall wing ring 2 is completely inserted into the tight ring gasket 5, as shown in the attached drawing 4, the radius of the internal thread of the thin-wall wing ring 2 is inwards deformed by e, the gap between the internal thread and the external thread of the screw 7 is reduced, the contact area of the internal thread and the external thread is greatly increased, and under the condition that the friction coefficient of the internal thread and the external thread is certain, the friction force between the internal thread and the external thread is greatly increased, so that the purpose of preventing the nut from loosening is achieved. Test and inspection prove that for M20 threaded connection, the interference between the excircle of the thin-wall wing ring 2 and the inner hole of the tight ring gasket 5 is 0.15mm, and after the nut and the screw are screwed up, the nut is continuously knocked and vibrated for 72 hours without any looseness.

The appearance of tightring gasket 5 can be the hexagon form, and when theftproof locknut subassembly was lifted off, the fixed tightring gasket 5 of general spanner, interior five special spanner twisted the nut, realized separation between them, then twisted the nut to break away from screw 7 can, theftproof locknut subassembly can reuse. The shape of the tight ring gasket 5 can also be circular, when the anti-theft locknut assembly is dismounted, the tight ring gasket 5 is in interference fit with the nut, the separation is difficult, and the anti-theft locknut assembly cannot be used again.

When the nut is processed, a die is used for one-time upsetting forming, internal threads are processed, and finally the notch 4 is processed. And the tight ring gasket 5 is formed by upsetting by a die and then an inner hole is processed.

Example 2.

The present embodiment differs from embodiment 1 in the shape and structure of the thin walled wing ring 2 as shown in figures 5 and 6. The outer surface of the thin-wall wing ring 2 is changed into a conical surface from the cylindrical surface in the embodiment 1, and is an outer conical surface 9, and the gap 4 is removed. Meanwhile, the inner hole of the clamp ring gasket 5 is changed into an inner conical surface 10 matched with the outer conical surface 9, as shown in figure 7. The inner and outer conical surfaces are matched, and one can replace an inner chamfer and an outer chamfer to realize quick positioning; friction force in the fastening and screwing process can be reduced, and the nut can be quickly fixed; the magnitude of interference between the thin-wall wing ring 2 and the tight ring gasket 5 can be adjusted, and the device is suitable for special occasions with requirements on torque. The gap 4 is removed, so that the disposable nut is suitable for being used, the friction area between the internal thread and the external thread is increased by utilizing the elastic or plastic deformation of the thin-wall wing ring 2, and the anti-loosening effect is achieved.

The cone angle of the inner cone surface 10 is preferably 3-8 degrees larger than that of the outer cone surface 9, so that the upper part of the thin-wall wing ring 2 is elastically deformed and the lower part of the thin-wall wing ring is plastically deformed under the matching action of the cone surfaces, and the complete meshing of the inner thread and the outer thread can be realized.

Example 3.

For nuts with a smaller size below M6, in order to increase the fitting area between the inside wrench and the nut, a regular triangle nut shown in fig. 8 and 9 may be used. In this embodiment, the thin-wall wing ring 2 is a cylindrical surface without a notch 4, and the nut is a right-circular regular triangle and is matched with a special spanner for an inner regular triangle.

Example 4.

For the nut with larger specification, in order to improve the stress state of the die and prolong the service life of the nut die, a regular heptagon is preferably adopted, and 3-4 gaps 4 of the thin-wall wing ring 2 are preferably uniformly distributed on the circumference due to the increased specification so as to be beneficial to the deformation of the thin-wall wing ring 2, and the structure of the nut is shown in attached figures 10 and 11. The inclination angle of the skyline is reduced compared to the regular pentagon. The more sides of the regular polygon are, the closer to a circle, the greater the probability of screw slippage. The embodiment is suitable for specifications above M30 nuts.

The method for mounting the nut and the retainer washer of this embodiment is the same as that of embodiment 1, and the manufacturing method is the same as that of embodiment 1. In this example, an M30 nut sample was produced and a fastening test was performed. In order to ensure that the thin-wall wing ring 2 can realize elastic deformation under the effect of manual screwing force, four notches 4 are uniformly processed on the thin-wall wing ring 2. After the nut is screwed up with the screw rod, the nut is continuously knocked and vibrated for a circle, and the nut is not loosened.

In the above embodiment, the square circle is a regular triangle, a regular pentagon or a regular heptagon, and the utility model does not exclude the shapes of a regular square, a regular hexagon and the like. The odd square shape is required to use a special spanner to screw the nut, and the anti-theft effect is good. Even square nut can use ordinary spanner to revolve wrong, because the utility model discloses a sky circle local structure has reduced the area of action that ordinary spanner revolves soon with the nut, and thin wall wing ring warp in addition has increased the area of contact of screw thread to increase the moment of torsion that the nut revolves soon, make ordinary spanner difficult to revolve wrong loose nut, also have good theftproof effect.

It should be noted that the existence and quantity of the notches 4 are related to the thickness of the thin-wall wing ring 2, and the thin-wall wing ring 2 has no notches, so that the whole strength is good, but the deformation capability is poor, and the nut is only suitable for small nuts. For the nuts with the diameter of more than M10, the thickness of the thin-wall wing ring 2 is increased due to the increase of the clearance between the internal thread and the external thread, so that gaps are easy to process, and the deformation capacity is increased. The number of the notches and the thickness of the thin-wall wing ring 2 supplement each other, and a balance point needs to be found out between the deformation capacity and the strength. For small nuts, the number of the notches is not recommended to exceed four, and the more the notches are, although the deformation is favorable, the deformation of the thin-wall wing ring 2 caused by collision in the production or loading, unloading and transportation process directly influences the use. However, for large size nuts, such as nuts exceeding M30, the number of notches is not limited to four to ensure the deformation requirement.

The utility model discloses utilize the deformation of thin wall wing ring, increased the area of contact of internal and external screw thread, increased and twisted frictional force soon, reached locking effect. Only a special spanner can be used for screwing, and the anti-theft effect is realized. In addition, the combination of the hemispherical dome structure and the deformed thin-wall wing ring can also play a good anti-theft effect. The utility model has the advantages of few parts, short manufacturing process flow and low production cost.

The utility model discloses made the three specification sample of M5, M20, M30, adopted triangle-shaped, pentagon, heptagon respectively to go on locking inspection, the experiment proves, the utility model discloses a special spanner fastening simple to operate, the locking effect of theftproof is good, and manufacturing process is simple, and low in production cost is suitable for application and popularization.

Claims (8)

1. The utility model provides an anti-theft locknut subassembly which characterized in that: comprises a nut and a tight ring gasket (5) which are used in a matching way; the nut comprises a nut body (1) and a thin-wall wing ring (2), the nut body (1) is in a hemispherical shape, and the thin-wall wing ring (2) is integrally connected with the nut body (1) at the place; the excircle of the thin-wall wing ring (2) is in interference fit with the inner hole of the tightening ring gasket (5), and the interference magnitude of the interference fit is not greater than the clearance between the internal thread and the external thread.

2. An anti-theft locknut assembly according to claim 1, wherein: the place is a right triangle, a right five square or a right seven square.

3. An anti-theft locknut assembly according to claim 1, wherein: the thin-wall wing ring (2) is provided with notches (4) which are symmetrically and uniformly distributed, and the number of the notches is 2-4.

4. An anti-theft locknut assembly according to claim 3, wherein: the width of the gap (4) is not less than the diameter difference between the excircle of the thin-wall wing ring (2) and the inner hole of the tight ring gasket (5).

5. An anti-theft locknut assembly according to claim 3, wherein: the notch (4) extends to the connecting surface of the nut body (1) and the thin-wall wing ring (2).

6. An anti-theft locknut assembly according to claim 1, wherein: an outer chamfer (3) is machined on the thin-wall wing ring (2), and an inner chamfer (6) matched with the outer chamfer (3) is machined on the tight ring gasket (5).

7. An anti-theft locknut assembly according to claim 1, wherein: the excircle of the thin-wall wing ring (2) is an outer conical surface (9), and the inner hole of the clamp ring gasket (5) is an inner conical surface (10) matched with the outer conical surface (9).

8. An anti-theft locknut assembly according to claim 7, wherein: the cone angle of the inner conical surface (10) is 3-8 degrees larger than that of the outer conical surface (9).

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