CN113483008A

CN113483008A - Single eccentric self-locking nut

Info

Publication number: CN113483008A
Application number: CN202110629536.XA
Authority: CN
Inventors: 李光泽; 李祥臣
Original assignee: Individual
Current assignee: Individual
Priority date: 2021-06-05
Filing date: 2021-06-05
Publication date: 2021-10-08

Abstract

The invention discloses a single eccentric self-locking nut, which comprises a lower nut and an upper nut. The bottom of the upper nut is provided with a stopper combination structure, the upper end of the lower nut is provided with a protruding eccentric sleeve combination structure, and the eccentric sleeve combination structure is connected with the stopper combination structure. . It fundamentally solves the problem of insufficient anti-loosening of the existing nut. It has the advantages of reasonable structure design, self-locking, reliable anti-loosening, convenient disassembly and assembly, mutual interchangeability, repeated use, and is not restricted by any use conditions. Its self-locking performance and service life.

Description

Single eccentric self-locking nut

Technical Field

The invention relates to a single eccentric self-locking nut, and belongs to the field of machining and manufacturing of mechanical parts.

Background

The nut and the bolt are theoretically considered in the fastening process: the threaded connector tightened with the torque T does not loosen as long as the loosening torque acting on the nut or bolt is not more than 0.8T. However, in practice, in an environment where the external force is relatively largely changed, such as when the vehicle is running on a bumpy ground, the nut may be loosened and rotated even if the loosening torque is not applied. This is because, when the threaded connection body is subjected to an external force, a component force in the radial direction is generated on the half-angle inclined surface of the thread, causing elastic radial expansion of the nut and axial contraction of the bolt. Therefore, when the threaded connection body is subjected to a constantly changing external force, a slight amount of radial and axial slippage occurs between the contact thread half-angle slope and the load surface of the nut and the bolt. When the external force is changed continuously, the relative sliding of the nut and the bolt at the contact thread semi-angle surface is repeated, and the accumulated result of the relative sliding can bring about the bolt rotation of the nut. In addition, when an external force acts, the friction of the thread half-angle surface changes from static friction to dynamic friction, so that the friction coefficient gradually decreases, and both between the bolt and the nut and between the bolt and the connected body tend to slip. When the changed external force reaches a certain value, the nut and the bolt can loosen and rotate. Therefore, in mechanical equipment and building structures under severe shock loads, the problem of loosening of the bolt and nut connection is very serious, and often causes a great accident potential.

Disclosure of Invention

The invention aims to provide a single eccentric self-locking nut, which solves the problems of insufficient slow strength and the like of the conventional nut loosening from the aspect of cost, has the characteristics of reasonable structure, convenient disassembly and assembly, repeated use, reliable loosening, no limitation of any use condition and the like, obviously improves the self-locking performance and prolongs the service life.

The invention aims to realize the purpose, and the single eccentric self-locking nut comprises a lower nut and an upper nut, wherein the bottom of the upper nut is provided with a spigot combined structure, the upper end of the lower nut is provided with a protruding eccentric sleeve combined structure, and the eccentric sleeve combined structure is connected with the spigot combined structure.

The eccentric sleeve combined structure comprises an eccentric conical sleeve, the upper end face of the eccentric cylindrical sleeve is integrally provided with the eccentric conical sleeve, the spigot combined structure comprises a spigot, the upper end face of the spigot is integrally provided with a conical spigot, the eccentric cylindrical sleeve corresponds to the spigot in position, and the eccentric conical sleeve corresponds to the conical spigot in position.

And an axial clearance which is not less than or equal to one half of the thread lead is arranged between the lower end surface of the eccentric spigot combined structure and the upper end surface of the lower nut in an initial state.

The internal thread of the lower nut is the same as the internal thread of the spigot combined structure, and the thread center lines of the lower nut and the spigot combined structure are on the same axial center line.

The axial center lines of the outer diameters of the eccentric cylindrical sleeve and the eccentric conical sleeve are the same, and the thread center line end deviates from an eccentric distance A and is positioned on the same eccentric axis.

The axial center lines of the inner diameters of the spigot and the cone spigot are the same, and the thread center lines of the spigot and the cone spigot are on the same axial center line.

And the outer surfaces of the spigot combined structure and the lower nut are provided with mark points.

Go up nut, tang integrated configuration surface lower extreme and be provided with 3 to 6 bumps of lug, shape, quantity design as required for spanner terminal surface location usefulness prevents when the operation nut under dry.

One end of the lower nut is provided with an eccentric cylindrical sleeve, an eccentric conical sleeve and a spigot combined structure with a built-in spigot and a cone spigot which are connected with the eccentric cylindrical sleeve. The internal threads are the same, the thread center lines are on the same axial center, the outer diameters of the eccentric cylindrical sleeve and the eccentric conical sleeve are different from the axial center lines of the inner diameters of the spigot and the cone spigot, and the deviation of the center lines is arranged on the same eccentric axis. On the other hand, the recessed portion formed in the upper nut to fit the projecting portion of the lower nut has an inner peripheral edge coaxial with the threaded hole of the upper nut. Thus, an eccentric relationship is formed between the convex portion and the concave portion. When the upper and lower nuts are tightened against each other, they will be forced aside a small radial distance from the common axis of the threaded bore. Thus, strong stress is applied to the half-angle inclined plane of the thread on the screw or the bolt body engaged with the threaded hole in the opposite radial direction, and radial force and friction force are generated, so that the connection nut can be prevented from loosening. This combination of strong stresses is sometimes referred to as a "wedging" effect that holds the nuts firmly in place, which does not allow the nuts to be unfastened without reason.

When the single eccentric self-locking nut needs to be disassembled, the spigot combined structure rotates to the initial position relative to the lower nut, the spigot combined structure is reset, the lower nut and the spigot combined structure can be rotated, the single eccentric self-locking nut is disassembled smoothly, the disassembly and the assembly are convenient, and the single eccentric self-locking nut is not limited by any condition. Because the connecting threads of the connected screw rod and the spigot combined structure are always matched in the rotating process, the mutually meshed threads are not damaged, so that the screw rod and the spigot combined structure can be repeatedly used, the self-locking performance of the nut is obviously improved, and the service life of the nut is prolonged. The larger the rotation number and the angle of the spigot combined structure are, the larger the self-locking force is, and the anti-loosening effect is good. The spigot combined structure is particularly suitable for important threaded connections which frequently generate strong vibration.

Drawings

FIG. 1 is a schematic structural view of an embodiment of the present invention;

FIG. 2 is an enlarged schematic view of the structure at A in FIG. 1;

FIG. 3 is a schematic view of the spigot assembly of the present invention;

FIG. 4 is a schematic view of the lower nut of the present invention;

FIG. 5 is a schematic view of a state of use of the present invention;

FIG. 6 is a schematic view of a usage state of the present invention;

the labels in the figure are: 1-upper nut, 2-lower nut, 3-mark, 4-lug, 5-taper spigot, 6-spigot, 7-eccentric taper sleeve, 8-eccentric cylindrical sleeve, 9-common washer, 10-connected piece, 11-bolt and A-eccentric.

Detailed Description

The technical features of the present invention will be further explained with reference to the accompanying drawings and specific embodiments.

In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

The specific structure of the present invention will be described in detail with reference to FIGS. 1 to 5. The single eccentric self-locking nut component is a double nut type component, which is composed of a lower nut 2 and an upper nut 1. These nuts can have any shape and also any type and size, but in the present embodiment they are hexagonal nuts, with threaded holes, passing through the upper nut 1 and the lower nut 2, respectively.

The single eccentric self-locking nut consists of an upper nut 1, a lower nut 2 and a spigot combined structure. Wherein, one end of the lower nut 2 is provided with an eccentric cylindrical sleeve 8, the upper end of the eccentric cylindrical sleeve 8 is integrally connected with an eccentric conical sleeve 7 which is assembled in the upper spigot combined structure, the eccentric cylindrical sleeve 8 is connected with the spigot 6, and the eccentric conical sleeve 7 is connected with the cone spigot 5. The internal thread of the lower nut 2 is the same as the internal thread of the spigot combined structure, and the thread central lines are on the same axial central line.

The spigot combined structure comprises a spigot 6, the spigot 6 is positioned at the bottom of the upper nut 1, a conical spigot 5 is integrally arranged on the upper end face of the spigot 6, an eccentric cylindrical sleeve 8 corresponds to the spigot 6 in position, and an eccentric conical sleeve 7 corresponds to the conical spigot 5 in position. The axial lead of the lower end of the taper spigot 5 and the axial lead of the spigot 6 are the same and the axial lead of the threaded hole is on the same axial central line.

The upper surface of the lower nut 2 is provided with an eccentric cylindrical sleeve 8, the upper end of the eccentric cylindrical sleeve 8 is provided with an eccentric conical sleeve 7, the outer diameters of the eccentric conical sleeve are the same, and the eccentric conical sleeve is deviated from an eccentric A and is on the same eccentric axis with the thread center line.

When the single eccentric self-locking nut is used for locking the connected piece 10 and the connecting bolt 11 through the common washer 9 and needs self-locking, the spigot combination structure is continuously rotated relative to the lower nut 2 along the direction of screwing the nut, and the operation is very simple. The center of the internal thread of the spigot combined structure will deviate relative to the internal thread of the connecting bolt 11 or the lower nut 2, under the action of the deviation, the internal thread of the spigot combined structure generates great radial and axial force at the meshing position relative to the external thread of the connecting bolt 11, according to the mechanics principle, the internal thread of the lower nut 2 generates great radial and axial reaction force at the meshing position relative to the external thread of the connecting bolt 11, and the anti-loosening spigot combined structure is firmly locked with the connected bolt 11 under the two radial and axial forces. The self-locking force is enhanced along with the increase of the rotation angle of the spigot combined structure relative to the lower nut 2, so that the locking function of preventing looseness, self-locking and slow locking is realized.

When the eccentric self-locking nut needs to be disassembled, the spigot combined structure is rotated along the opposite direction during self-locking to reset the spigot combined structure, the central line of the internal thread of the spigot combined structure is superposed with the central line of the internal thread of the lower nut 2, and the spigot combined structure can be smoothly disassembled by generating gaps on two surfaces of double half angles of the thread, and is the same as a common nut and can be repeatedly used.

The present invention is not limited to the above-described examples, and it may be modified or changed in any appropriate manner within the scope of the technical concept disclosed in the present invention. For example, the overall structure of the upper nut 1 and the lower nut 2 may be selected. The nuts need not be hexagonal, but they may also be octagonal or any other polygonal shape. (i.e., equilateral polygonal in plan view) or round nuts.

As shown in fig. 2, each lug 4 is arranged on any one of the side lugs 4 parallel to the nut low plane perpendicular to the centre line, but may also protrude from the apex of the junction of the adjacent sides of the upper nut 1, i.e. the junction of the nut 1 on the adjacent sides.

In summary, in using the nut assembly of the present invention, a tightening tool will contact the lateral lugs 4 of the upper nut 1 so as not to interfere with the lower nut 2, thereby facilitating the tightening of the upper nut 1. The operator who tightens the nut assembly can visually see the angle of rotation of the nut to easily and reliably impart it with a standard torque in its final angular position.

Claims

1. The utility model provides a single off-centre is from lock nut which characterized in that: the novel nut comprises a lower nut (2) and an upper nut (1), wherein a spigot combined structure is arranged at the bottom of the upper nut (1), a protruding eccentric sleeve combined structure is arranged at the upper end of the lower nut (2), and the eccentric sleeve combined structure is connected with the spigot combined structure.

2. The single eccentric self-locking nut of claim 1, wherein: the eccentric sleeve combined structure is as follows: an eccentric taper sleeve (7) is integrally arranged on the upper end face of the eccentric cylindrical sleeve (8), and the eccentric cylindrical sleeve (8) is integrally connected to the upper end face of the lower nut (2); the spigot combined structure comprises a spigot (6), the spigot (6) is located at the bottom of the upper nut (1), a conical spigot (5) is integrally arranged on the upper end face of the spigot (6), an eccentric cylindrical sleeve (8) corresponds to the spigot (6), and an eccentric conical sleeve (7) corresponds to the conical spigot (5).

3. The single eccentric self-locking nut of claim 1, wherein: and an axial clearance which is not less than or equal to one half of the thread lead is arranged between the lower end surface of the spigot combined structure and the upper end surface of the lower nut (2) in an initial state.

4. The single eccentric self-locking nut of claim 1, wherein: the internal thread of the lower nut (2) is the same as the internal thread of the spigot combined structure, and the thread center lines are on the same axial center line.

5. The single eccentric self-locking nut of claim 2, wherein: the taper spigot (5) and the spigot (6) are coaxial, and the axial center line of the taper spigot and the thread center line of the taper spigot are on the same axis.

6. The single eccentric self-locking nut of claim 2, wherein: the outer diameters of the eccentric cylindrical sleeve (8) and the eccentric conical sleeve (7) and the axial center lines of the inner diameters of the spigot (6) and the conical spigot (5) generate an eccentricity A, and the axial center line and the thread center line end deviate on the same eccentric axis.

7. The single eccentric self-locking nut of claim 1, wherein: and the outer surfaces of the upper nut (1) and the lower nut (2) are provided with mark points (8).

8. The single eccentric self-locking nut of claim 1, wherein: and a lug (4) is arranged at the lower end of the outer surface of the upper nut (1).