CN219366542U

CN219366542U - Difficult loose locknut that becomes flexible

Info

Publication number: CN219366542U
Application number: CN202223609188.9U
Authority: CN
Inventors: 冯关相
Original assignee: Individual
Current assignee: Individual
Priority date: 2022-12-29
Filing date: 2022-12-29
Publication date: 2023-07-18
Anticipated expiration: 2032-12-29

Abstract

The utility model provides a looseness-resistant locknut, which relates to the field of threaded fasteners and comprises a locknut and an inner cone nut, wherein a locknut threaded hole is formed in the locknut, a plurality of outer cones are arranged on the upper portion of the locknut, the radius of the outer cone portion is gradually reduced from bottom to top, an inner cone threaded hole is formed in the inner cone nut, an inner cone is arranged on the lower portion of the inner cone nut, the radius of a groove portion of the inner cone is gradually reduced from bottom to top and is matched with that of the outer cone, the looseness-resistant locknut enables the inner cone side of the inner cone nut to extrude the outer cone side of the locknut through the screwing action of the inner cone nut on a matched bolt, the inner threads of the outer cone are in full contact with the outer threads of the matched bolt, strong locking force is formed, the looseness of the locknut is effectively prevented, equipment faults caused by looseness of the locknut are effectively reduced, the plurality of outer cones are elastically arranged, the later maintenance and disassembly are facilitated, and the repeated use of the locknut is improved.

Description

Difficult loose locknut that becomes flexible

Technical Field

The utility model relates to the technical field of threaded fasteners, in particular to a locknut which is not easy to loosen.

Background

The nut and the bolt are matched for fastening parts, and are common fasteners in mechanical equipment and production and life. In the fastening of parts, the vibration frequency is high, the reciprocating motion is strong, and the nut for fastening the workpiece is loosened, so that some equipment is often caused to have physical faults, and the equipment cannot work normally even causes safety accidents. The traditional nut is a nut body provided with an internal thread screw hole, and the nut body is completely screwed by means of threads to play a fastening role, so that the phenomenon of loosening of the nut and the bolt exists along with the running vibration of equipment. How to effectively prevent the loosening of the nut, reduce the occurrence of equipment faults and ensure the safe and reliable operation of the equipment is an important problem which is urgently needed to face.

In the prior art (patent number: CN202010993727. X), a locknut is disclosed, comprising a nut A, a nut B and a bolt, wherein the bottom of the nut B is set as a plane A, one side of the surface of the nut A is set as a plane B, the bottom of the nut B is an end face A, one side of the surface of the nut A is set as an inclined plane A, the inner side wall of the nut B is provided with a clamping surface A and a clamping surface B, the bottom of the nut A is provided with an inclined plane B, the top of the nut B is set as an end face B, the bottom of the nut A is provided with a plane C, the inner side wall of the nut A is provided with a clamping surface C and a clamping surface D, the bottom of the nut A is provided with a supporting end face which increases the eccentricity of a convex table surface of the nut A, the movement of the nut A towards the right lower angle can be prevented, and the angle of the inclined plane B, the angle of the inclined plane A and the direction of the eccentricity H of the convex table surface are on a straight line projected from the vertical projection, and the effect of locking and locking friction force is increased.

In the prior art, the boss is arranged at the upper end of the nut A, then the boss is annular, the boss is inelastic, the nut A is matched with the nut B to form a wedging locking mode, the thread engagement force on the surface of the bolt is undoubtedly increased, the possibility of damage to threads on the surface of the bolt is increased, and when the nut needs to be disassembled, the nut is difficult to disassemble due to 'broken threads', and the disassembly and the repeated installation are not facilitated.

Disclosure of Invention

(one) solving the technical problems

Aiming at the defects of the prior art, the utility model provides a locknut which is not easy to loosen, and solves the problems in the prior art.

(II) technical scheme

In order to achieve the above purpose, the utility model is realized by the following technical scheme: the utility model provides a difficult loose locknut, includes locknut and in-band cone nut, locknut internal processing has locknut screw hole, locknut screw hole and locknut concentric centre of a circle, locknut upper portion is equipped with a plurality of outer cones, and outer cone part reduces gradually from bottom to top radius, in-band cone nut internal processing has in-band cone nut screw hole, just in-band cone nut screw hole is concentric with in-band cone nut, and in-band cone nut lower part has the inner cone, the inner cone is concentric with in-band cone nut, and the recess part of inner cone reduces gradually from bottom to top radius and outer cone looks adaptation.

Preferably, the outer cone is symmetrically two pieces and is symmetrically matched.

Preferably, the outer cone is formed by symmetrically arranging three pieces at equal angles in circumference.

Preferably, the outer cone comprises a convex conical surface and a chamfer, and the convex conical surface is a spherical surface.

Preferably, the inclination angle between the side surface of the outer cone of the anti-loose main nut and the axis of the nut is 35-40 degrees, and the inclination angle between the side surface of the inner cone of the in-band cone nut and the axis of the nut is 35-40 degrees, and the specific inclination angle is only required to meet the requirement that the anti-loose main nut and the in-band cone nut are mutually extruded when being screwed.

Preferably, the anti-loose main nut and the in-band cone nut are installed in pairs, when the anti-loose main nut is installed, the outer cone body of the anti-loose main nut stretches into the inner cone of the in-band cone nut, and the anti-loose main nut is installed closer to the connecting surface than the in-band cone nut.

(III) beneficial effects

The utility model provides a locknut which is not easy to loosen. The beneficial effects are as follows:

1. the difficult loose-proof nut is characterized in that the inner cone side of the inner cone nut is extruded against the outer cone part side of the loose-proof main nut through the screwing action of the inner cone nut on the matched bolt, so that a lateral extrusion action is formed, the outer cone generates radial and axial biting force on the matched bolt, the inner cone inner thread of the outer cone is fully contacted with the outer thread of the matched bolt, a strong locking force is formed, the loose-proof main nut is effectively prevented from loosening, and meanwhile, the extrusion action generated by the reaction force of the outer cone part side of the inner cone nut against the inner cone part side of the inner cone nut is used for preventing the loose of the inner cone nut, so that equipment faults caused by the loose of the nuts are effectively reduced

2. The outer cone of the upper end face of the anti-loose main nut is a plurality of, is elastically arranged, is easy to install and convenient to detach, is convenient for overhauling mechanical parts, and improves the recycling of the anti-loose nut.

Drawings

FIG. 1 is a schematic view of an in-band cone nut of a difficult-to-loosen locknut of the present utility model;

FIG. 2 is a schematic view of a first embodiment of a locknut of the present utility model;

FIG. 3 is a schematic view of a second embodiment of a locknut of the present utility model;

FIG. 4 is a schematic view (cross-sectional view) of an embodiment of a non-looseness-resistant locknut of the present utility model;

fig. 5 is a schematic view (cross-sectional view) of an embodiment of a non-loose locknut of the present utility model.

In the figure: 1. a nut with an inner cone; 11. an inner cone; 12. threaded hole with inner cone nut; 2. a locknut; 21. an outer cone; 211. a convex conical surface; 212. chamfering; 22. a locking main nut threaded hole; 3. and (5) matching the bolts.

Detailed Description

The embodiment of the utility model provides a looseness-resistant locknut, which comprises a locknut and an internally tapered nut, as shown in figures 1-5, wherein a locknut threaded hole is formed in the locknut, the locknut threaded hole is concentric with the locknut, a plurality of outer cones are arranged on the upper part of the locknut, the radius of the outer cone part is gradually reduced from bottom to top, an internally tapered nut threaded hole is formed in the internally tapered nut, the internally tapered nut threaded hole is concentric with the internally tapered nut, an internally tapered nut is arranged on the lower part of the internally tapered nut, the internally tapered nut is concentric with the internally tapered nut, the radius of a groove part of the internally tapered nut is gradually reduced from bottom to top, and the groove part of the internally tapered nut is matched with the outer cone.

As shown in fig. 2, the outer cone is symmetrically two pieces and is symmetrically matched.

As shown in fig. 3, the outer cone is formed of three symmetrical pieces, arranged circumferentially at equal angles,

as shown in fig. 2 and 3, the two opposite sides or three opposite sides are arranged at equal angles, compared with the outer cone of the round table shape, the core of the lock nut is in elasticity, the lock nut changes the locking mode of the wedge shape of the traditional lock nut due to the elastic function, and the locking mode of the holding type is presented, so that the damage to the 'teeth' of the matched bolt is avoided, the disassembly and the assembly of the lock nut which is not easy to loosen are facilitated when the equipment is maintained at the later stage, and the recycling rate is improved.

As shown in fig. 2 and 3, the outer cone comprises a convex cone surface and a chamfer angle, and the convex cone surface is a spherical surface.

Further, the inclination angle of the outer cone side surface of the anti-loose main nut and the axis of the nut is 35-40 degrees, the inclination angle of the inner cone side surface of the in-band cone nut and the axis of the nut is 35-40 degrees, and the specific inclination angle is only required to meet the requirement that the anti-loose main nut and the in-band cone nut are mutually extruded when being screwed.

Further, the anti-loose main nut and the in-band cone nut are installed in pairs, when the anti-loose main nut is installed, the outer cone body of the anti-loose main nut stretches into the inner cone of the in-band cone nut, and the anti-loose main nut is installed closer to the connecting surface than the in-band cone nut.

In the embodiment, taking an M24 nut as an example, the inclination of the anti-loosening main nut is 17.5 degrees, the taper is equally divided into 35 degrees, the height of the outer taper is 7.5 millimeters, the taper of the inner taper is 35 degrees, and the taper depth of the inner taper is 7.85 millimeters.

Working principle: when the looseness-resistant locknut is used, as shown in fig. 4 and 5, the locknut 2 is firstly screwed on the matched bolt 3, then the in-band cone nut 1 is screwed on the matched bolt 3 until the round table-shaped outer cone 21 of the locknut and the inner cone 11 of the in-band cone nut are mutually extruded, the extrusion degree is determined according to the required pretightening strength of the part, when the in-band cone nut is screwed into the locknut, the outer cone of the locknut is fully retracted inwards, the inner thread of the outer cone tightly holds the outer thread of the matched bolt, so that the locknut cannot loosen, meanwhile, a gap is reserved between the in-band cone nut and the locknut, and the upper end face of the locknut is not compacted, so as to prevent the locking effect from being affected,

the working assembly method comprises the following steps:

1. tightening the locknut to the proper torque using a tightening tool, notes: the anti-loose main nut has the same strength grade with the common hexagonal nut, so the same torque as the common hexagonal nut can be used.

2. The inner cone nut is manually screwed on the anti-loose main nut until the nut is not screwed, at the moment, the inner cone of the inner cone nut is abutted against the convex conical surface of the outer cone of the anti-loose main nut, and the outer cone is inwards held together to pre-tighten the external threads of the matched bolts.

3. After manual tightening, the nut with the inner cone is tightened to a value specified by a standard torque value reference table by using a torque wrench, so that the inner thread of the outer cone is fully and comprehensively contacted with the outer thread of the matched thread, the contact surface and friction force are increased, and the following steps are performed: in order to achieve the best effect, a torque wrench is used, a space is ensured between the two nuts before the nuts with the inner cones are screwed, otherwise, the force application effect of the nuts with the inner cones and the upper end face of the locknut influence the force application of the outer cones, and the sufficient locking effect cannot be achieved.

4. Even if the installation is tightened as required by the standard, there may be a small gap between the two nuts due to bolt diameter tolerances. And (3) injection: whether or not there is a gap, the normal installation will have a sufficient locking effect.

5. When the nut structure is required to be maintained and disassembled in the later period, the nut with the inner cone is reversely screwed out, the outer cone is restored to the original position under the elastic action, and then the anti-loose main nut is unscrewed, so that equipment maintenance is realized, and the nut structure is reused.

To sum up

Although embodiments of the present utility model have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made therein without departing from the principles and spirit of the utility model, the scope of which is defined in the appended claims and their equivalents.

Claims

1. A difficult loose-proof nut, its characterized in that: including locknut (2) and in-band cone nut (1), the inside processing of locknut (2) that belongs has locknut screw hole (22), locknut screw hole (22) concentric with locknut (2), locknut (2) upper portion is equipped with a plurality of outer cones (21), and outer cone part reduces from bottom to top radius gradually, in-band cone nut (1) inside processing has in-band cone nut screw hole (12), just in-band cone nut screw hole (12) concentric with in-band cone nut (1), and in-band cone nut (1) lower part has interior cone (11), interior cone (11) concentric with in-band cone nut (1), and the recess part of interior cone (11) reduces from bottom to top radius gradually, with outer cone (21) looks adaptation, outer cone (21) include protruding conical surface (211), chamfer (212), protruding conical surface (211) are the sphere.

2. A non-loosening locknut as defined in claim 1, wherein: the outer cone body (21) is symmetrically two pieces and is symmetrically matched.

3. A non-loosening locknut as defined in claim 1, wherein: the outer cone body (21) is formed by symmetrically arranging three pieces of outer cones at equal angles in circumference.

4. A non-loosening locknut as defined in claim 1, wherein: the inclination angle of the side surface of the outer cone (21) of the anti-loose main nut (2) and the axis of the nut is 35-40 degrees, the inclination angle of the side surface of the inner cone (11) of the in-band cone nut (1) and the axis of the nut is 35-40 degrees, and the specific inclination angle is only required to meet the requirement that the anti-loose main nut (2) and the in-band cone nut (1) are mutually extruded when being screwed.

5. A non-loosening locknut as defined in claim 1, wherein: the anti-loose main nut (2) and the in-band cone nut (1) are installed in pairs, when the anti-loose main nut is installed, an outer cone (21) of the anti-loose main nut (2) stretches into an inner cone (11) of the in-band cone nut (1), and the anti-loose main nut (2) is installed closer to a connecting surface than the in-band cone nut (1).