CN210509905U

CN210509905U - Locknut assembly

Info

Publication number: CN210509905U
Application number: CN201921531410.3U
Authority: CN
Inventors: 曹飞
Original assignee: Individual
Current assignee: Individual
Priority date: 2019-09-16
Filing date: 2019-09-16
Publication date: 2020-05-12
Anticipated expiration: 2029-09-16

Abstract

The utility model provides a locknut component, which comprises a convex nut and a concave nut, wherein the convex nut and the concave nut are sequentially in threaded connection with the same bolt, and the convex nut is closer to the head of the bolt than the concave nut; the male nut consists of a first nut body and a frustum, the large end of the frustum is attached to the surface of the first nut body, the frustum and the first nut body are coaxially arranged and integrally formed, a threaded hole of the first nut body extends to the frustum and penetrates through the frustum, and N wedge-shaped bodies are arranged on the end face of the small end of the frustum; the female nut comprises a second nut body, the second nut body is provided with a taper hole coaxial with the second nut body, the taper hole is a blind hole, and the inner end face of the taper hole is provided with N wedge-shaped cavities for inserting wedge-shaped bodies. The utility model discloses utilize the interference fit of taper hole and frustum to realize the auto-lock of convex nut and concave nut, utilize the meshing in wedge and wedge chamber to increase the clamp force between convex nut and the concave nut.

Description

Locknut assembly

Technical Field

The utility model relates to a fastener field especially relates to a locknut subassembly.

Background

Bolt and nut are the most widely used fasteners in recent years, and have found application almost anywhere. In the fastening of spare part and spare part, the nut is become flexible often can cause some equipment to take place physical fault to make equipment normally work even cause the incident.

The anti-loosening of the nut means that the connection performance is prevented from being weakened under the action of resisting external impact, vibration or variable load after the threaded connection is normally fastened and under the condition of high temperature or large temperature change.

The Chinese patent with publication number CN109764053A discloses a locknut, which comprises a concentric convex nut and an eccentric concave nut. The concentric convex nut and the eccentric concave nut threaded hole are communicated, the radius of the concentric convex nut and the radius of the eccentric concave nut threaded hole are the same, the thread pitches are the same, and the screwing directions are opposite, so that the two nuts are not easy to loosen relatively. This patent makes eccentric concave nut recess side produce the extrusion to concentric convex nut bulge part side through the tightening effect of eccentric concave nut on the double-screw bolt, form side direction extrusion effect, it is not hard up to prevent effectively that concentric convex nut from, and simultaneously, the extrusion that the reaction force of concentric convex nut bulge part side to eccentric concave nut recess part side produced prevents that eccentric concave nut is not hard up, and concentric convex nut is opposite with eccentric concave nut soon, prevents effectively that concentric convex nut is not hard up with eccentric concave nut. And the nut is easy to install and disassemble, the mechanical parts are convenient to overhaul, and equipment faults caused by loosening of the nut are effectively reduced.

The patent relies on the eccentric pressure of eccentric female nut to lock concentric male nut to reach locking purpose. However, when eccentric pressure is applied to the concentric male nut and the eccentric female nut, the thread engagement between the nut and the bolt inevitably deviates to one side, so that the stress on the thread is uneven, and the fatigue strength of the bolt and the nut is affected.

In view of the above, it is desirable to provide a new locknut assembly to solve the problem of uneven stress on the threads.

Disclosure of Invention

The utility model provides a locknut subassembly utilizes the circular conical surface to realize the auto-lock, utilizes the wedge meshing to increase the clamp force.

Realize the utility model discloses the technical scheme of purpose as follows:

a locknut assembly comprises a convex nut and a concave nut, wherein the convex nut and the concave nut are sequentially in threaded connection with the same bolt, and the convex nut is closer to the head of the bolt relative to the concave nut;

the male nut consists of a first nut body and a frustum, the large end of the frustum is attached to the surface of the first nut body, the frustum and the first nut body are coaxially arranged and integrally formed, a threaded hole of the first nut body extends to the frustum and penetrates through the frustum, and N wedge-shaped bodies are arranged on the small end face of the frustum;

the female nut comprises a second nut body, the second nut body is provided with a taper hole coaxial with the second nut body, the taper hole is a blind hole, and the inner end face of the taper hole is provided with N wedge-shaped cavities for inserting wedge-shaped bodies;

when the second nut body is screwed into the screw rod, the small end of the frustum is firstly inserted into the blind hole until the wedge-shaped body is completely matched with the wedge-shaped cavity, and then the second nut is stopped to be screwed in, and at the moment, the frustum is in interference fit with the taper hole.

The utility model discloses utilize the interference fit of taper hole and frustum to realize the auto-lock of convex nut and concave nut, utilize the meshing in wedge and wedge chamber to increase the clamp force between convex nut and the concave nut.

As a further improvement of the utility model, the wedge body is in interference fit with the wedge cavity.

As a further improvement of the utility model, the surface of wedge towards the second nut body is first domatic, it is domatic for the second at the bottom of the chamber in wedge chamber, first domatic and the domatic cooperation of second.

The utility model discloses well first domatic inclination is opposite with the domatic inclination of second, and along with the twist of concave nut, first domatic and the domatic area of contact of second crescent, until first domatic and the domatic area of contact of second when the biggest, concave nut is twisted to extreme position. When the self-rotation happens due to the vibration of the bolt, the convex nut and the concave nut in the using process, the contact area of the first slope and the second slope is reduced, the axial size of the first slope and the axial size of the second slope are increased, the convex nut has the trend of moving closer to the head of the bolt, the clamping force of the convex nut is increased, and meanwhile, the rotation of the concave nut can generate larger reverse resistance force.

As a further improvement of the utility model, the inclination direction of the first slope surface is consistent with the rotation direction of the concave nut.

The utility model discloses a first domatic incline direction is unanimous with the spiral of concave nut, indicates that it is longest to revolve the one end of the unanimous wedge with concave nut, and it is shortest to revolve the other end of the opposite wedge with concave nut. When the bolt, the convex nut and the concave nut vibrate and spin, the axial sizes of the first slope surface and the second slope surface are increased, and the convex nut tends to move closer to the head of the bolt.

As a further improvement, the first domatic slope is greater than the lead screw angle of convex nut, the domatic slope of second is greater than the lead screw angle of concave nut.

As a further improvement of the utility model, the tapering of frustum is less than 8, the fitting surface of frustum and taper hole is greater than 75%.

The utility model discloses utilize the conical surface auto-lock, when two conical surfaces of matched with under the condition that receives certain external force, the small elastic deformation that the metal surface produced has produced frictional force between the two, makes it can transmit or bear the moment of torsion.

As a further improvement of the utility model, the interference fit tolerance grade of taper hole and frustum is IT4 ~ IT 8.

Compared with the prior art, the beneficial effects of the utility model are that:

1. the utility model discloses utilize the interference fit of taper hole and frustum to realize the auto-lock of convex nut and concave nut, utilize the meshing in wedge and wedge chamber to increase the clamp force between convex nut and the concave nut.

2. The utility model discloses well first domatic inclination is opposite with the domatic inclination of second, and along with the twist of concave nut, first domatic and the domatic area of contact of second crescent, until first domatic and the domatic area of contact of second when the biggest, concave nut is twisted to extreme position. When the self-rotation happens due to the vibration of the bolt, the convex nut and the concave nut in the using process, the contact area of the first slope and the second slope is reduced, the axial size of the first slope and the axial size of the second slope are increased, the convex nut has the trend of moving closer to the head of the bolt, the clamping force of the convex nut is increased, and meanwhile, the rotation of the concave nut can generate larger reverse resistance force.

3. The utility model discloses a first domatic incline direction is unanimous with the spiral of concave nut, indicates that it is longest to revolve the one end of the unanimous wedge with concave nut, and it is shortest to revolve the other end of the opposite wedge with concave nut. When the bolt, the convex nut and the concave nut vibrate and spin, the axial sizes of the first slope surface and the second slope surface are increased, and the convex nut tends to move closer to the head of the bolt.

4. The male nut is tightened to generate sufficient axial fastening force, and the male nut is tightly held with the bolt and generates additional axial force through the wedge body. The male nut attempts to loosen under the combined forces of all parties, firstly, the torque resisting the axial fastening force is larger than the conventional torque, and the loosening direction of the male nut is just closer to the female nut.

5. The utility model discloses utilize the conical surface auto-lock, when two conical surfaces of matched with under the condition that receives certain external force, the small elastic deformation that the metal surface produced has produced frictional force between the two, makes it can transmit or bear the moment of torsion.

Drawings

FIG. 1 is a schematic view of the installation of a locknut assembly with a bolt (wedge and wedge cavity omitted);

FIG. 2 is a schematic structural view of a male nut (with internal threads omitted);

FIG. 3 is a schematic structural view of the female nut (internal threads omitted);

FIG. 4 is a schematic structural view of a male nut with anti-loosening function only by means of a tapered surface (internal threads are omitted);

fig. 5 is a schematic structural view of a female nut that is only locked by a tapered surface (internal threads are omitted).

In the figure, 1, a male nut; 11. a first nut body; 12. a frustum; 13. a wedge; 2. a female nut; 21. a second nut body; 22. a taper hole; 23. a wedge-shaped cavity; 10. a bolt; 100. a head portion; 200. a screw.

Detailed Description

The present invention is described in detail with reference to the embodiments shown in the drawings, but it should be understood that these embodiments are not intended to limit the present invention, and those skilled in the art should understand that the functions, methods, or structural equivalents or substitutions made by these embodiments are within the scope of the present invention.

In the description of the present embodiments, it is to be understood that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of describing the present invention and simplifying the description, but do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention.

Furthermore, the terms "first," "second," "third," and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicit to a number of indicated technical features. Thus, a feature defined as "first," "second," etc. may explicitly or implicitly include one or more of that feature. In the description of the invention, the meaning of "a plurality" is two or more unless otherwise specified.

The utility model provides a locknut subassembly, includes convex nut 1 and concave nut 2, and convex nut 1 and concave nut 2 mutually support, and convex nut 1 and concave nut 2 matched with position are the toper face, and convex nut 1 is the head 100 that bolt 10 is more close to concave nut 2 relatively, the utility model discloses utilize the interference fit of taper hole 22 and frustum 12 to realize convex nut 1 and concave nut 2's auto-lock.

It should be noted that, the male nut 1 and the female nut 2 of the present invention can only rely on the interference fit of the tapered surfaces to achieve the anti-loosening. Of course, in order to improve the anti-loosening effect, the utility model discloses can also utilize the meshing of wedge 13 and wedge chamber 23 to increase the clamp force between male nut 1 and female nut 2.

The first implementation mode comprises the following steps:

the embodiment discloses a locknut assembly, as shown in fig. 1-3, comprising a convex nut 1 and a concave nut 2, wherein the convex nut 1 and the concave nut 2 are sequentially in threaded connection with the same bolt 10, and the convex nut 1 is closer to the head 100 of the bolt 10 than the concave nut 2; the male nut 1 consists of a first nut body 11 and a frustum 12, the large end of the frustum 12 is attached to the surface of the first nut body 11, the frustum 12 and the first nut body 11 are coaxially arranged and integrally formed, a threaded hole of the first nut body 11 extends to the frustum 12 and penetrates through the frustum 12, and N wedges 13 are arranged on the small end face of the frustum 12; the female nut 2 comprises a second nut body 21, the second nut body 21 is provided with a taper hole 22 coaxial with the second nut body, the taper hole 22 is a blind hole, and the inner end surface of the taper hole 22 is provided with N wedge-shaped cavities 23 for inserting the wedge-shaped bodies 13; when the second nut body 21 is screwed into the screw, the small end of the frustum 12 is firstly inserted into the blind hole until the wedge 13 is completely matched with the wedge cavity 23 and then the second nut is stopped to be screwed in, and at the moment, the frustum 12 is in interference fit with the taper hole 22. Of course, the present embodiment may also utilize the engagement of the wedge 13 and the wedge cavity 23 to increase the clamping force between the male nut 1 and the female nut 2.

In the embodiment, the self-locking of the male nut 1 and the female nut 2 is realized by the interference fit of the taper hole 22 and the frustum 12, and the clamping force between the male nut 1 and the female nut 2 is increased by the engagement of the wedge-shaped body 13 and the wedge-shaped cavity 23.

The tightening of the male nut 1 of the present embodiment generates a sufficient axial fastening force, and the male nut 1 generates an additional axial force by the wedge 13 in addition to the holding with the bolt 10. The male nut 1 attempts to loosen under the combined forces of all sides, firstly the torque resisting the axial tightening force is larger than the conventional torque, and the loosening direction of the male nut just tends to be tighter than that of the female nut 2.

In the embodiment, the conical surfaces are self-locked, and when the two matched conical surfaces are subjected to a certain external force, the friction force is generated between the two due to the tiny elastic deformation generated on the metal surfaces, so that the two conical surfaces can transmit or bear the torque.

The second embodiment:

the embodiment discloses a locknut assembly, which comprises a convex nut 1 and a concave nut 2, wherein the structures of the convex nut 1 and the concave nut 2 are consistent with the structure of the first embodiment. On the basis of the structure of the first embodiment, the present embodiment also discloses the structures of the wedge 13 and the wedge cavity 23.

Preferably, the wedge 13 and the wedge cavity 23 are interference fit. This embodiment interference fit has increased locking resistance, the better not hard up that prevents nut assembly.

As shown in fig. 2 and 3, the surface of the wedge 13 facing the second nut body 21 is a first slope, the bottom of the wedge cavity 23 is a second slope, and the first slope and the second slope are matched. In this embodiment, the inclination angle of the first slope is opposite to that of the second slope, and the contact area between the first slope and the second slope is gradually increased along with the screwing of the female nut 2 until the contact area between the first slope and the second slope is the largest, and the female nut 2 is screwed to the limit position. When the self-rotation happens because the vibration of the bolt 10, the convex nut 1 and the concave nut 2 in the use process, the contact area of the first slope and the second slope is reduced, the axial size of the first slope and the second slope is increased at the moment, the convex nut 1 has the trend of moving closer to the head 100 of the bolt 10, the clamping force of the convex nut 1 is increased, and meanwhile, the rotation of the concave nut 2 can generate larger reverse resistance force.

Preferably, the inclination direction of the first slope is the same as the screwing direction of the female nut 2. The inclination direction of the first slope surface of the present embodiment is the same as the rotation direction of the female nut 2, and means that one end of the wedge 13 which is the same as the rotation direction of the female nut 2 is the longest and the other end of the wedge 13 which is opposite to the rotation direction of the female nut 2 is the shortest. Thus, when the bolt 10, the male nut 1 and the female nut 2 vibrate and spin, the axial sizes of the first slope surface and the second slope surface are increased, and the male nut 1 has the tendency of moving closer to the head 100 of the bolt 10.

Preferably, the slope of the first slope surface is larger than the lead angle of the convex nut 1, and the slope of the second slope surface is larger than the lead angle of the concave nut 2. The slope of the first domatic slope of this embodiment is greater than the screw lead angle of convex nut 1, more does benefit to the cooperation of first domatic and second, when concave nut 2 was twisted, more does benefit to the first domatic maximize contact with the second.

The third embodiment is as follows:

the embodiment discloses a locknut assembly, as shown in fig. 4 and 5, including a male nut 1 and a female nut 2, where the mating part of the male nut 1 and the female nut 2 is a conical surface, and the male nut 1 is closer to the head 100 of the bolt 10 than the female nut 2. In addition to the structure of the first embodiment, the present embodiment also discloses the structures of the frustum 12 and the taper hole 22. The convex nut 1 is composed of a first nut body 11 and a frustum 12, the concave nut 2 comprises a second nut body 21, the second nut body 21 is provided with a taper hole 22 coaxial with the second nut body, the taper hole 22 is a blind hole, the second nut body 21 is screwed into a screw rod, and the small end of the frustum 12 is inserted into the taper hole 22 firstly.

Preferably, the taper of the frustum 12 is less than 8 degrees, and the mating surface of the frustum 12 and the taper hole 22 is more than 75 percent. In the embodiment, the conical surfaces are self-locked, and when the two matched conical surfaces are subjected to a certain external force, the friction force is generated between the two due to the tiny elastic deformation generated on the metal surfaces, so that the two conical surfaces can transmit or bear the torque. The preferred interference fit tolerance levels for the tapered bore 22 and the frustum 12 are IT4 to IT 8. The specific parameters of IT 4-IT 8 can be obtained by querying a standard tolerance table.

The above list of details is only for the practical implementation of the present invention, and they are not intended to limit the scope of the present invention, and all equivalent implementations or modifications that do not depart from the technical spirit of the present invention should be included in the scope of the present invention.

It is obvious to a person skilled in the art that the invention is not restricted to details of the above-described exemplary embodiments, but that it can be implemented in other specific forms without departing from the spirit or essential characteristics of the invention. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.

Furthermore, it should be understood that although the present description refers to embodiments, not every embodiment may contain only a single embodiment, and such description is for clarity only, and those skilled in the art should integrate the description, and the embodiments may be combined as appropriate to form other embodiments understood by those skilled in the art.

Claims

1. The locknut assembly is characterized by comprising a convex nut (1) and a concave nut (2), wherein the convex nut (1) and the concave nut (2) are sequentially in threaded connection with the same bolt (10), and the convex nut (1) is closer to the head (100) of the bolt (10) relative to the concave nut (2);

the male nut (1) is composed of a first nut body (11) and a frustum (12), the large end of the frustum (12) is attached to the surface of the first nut body (11), the frustum (12) and the first nut body (11) are coaxially arranged and integrally formed, a threaded hole of the first nut body (11) extends to the frustum (12) and penetrates through the frustum (12), and N wedge-shaped bodies (13) are arranged on the small end face of the frustum (12);

the female nut (2) comprises a second nut body (21), the second nut body (21) is provided with a taper hole (22) coaxial with the second nut body, the taper hole (22) is a blind hole, and the inner end face of the taper hole (22) is provided with N wedge-shaped cavities (23) for inserting the wedge-shaped bodies (13);

when the second nut body (21) is screwed into the screw rod, the small end of the frustum (12) is firstly inserted into the blind hole until the wedge-shaped body (13) is completely matched with the wedge-shaped cavity (23) and then the second nut is stopped being screwed in, and at the moment, the frustum (12) and the taper hole (22) are in interference fit.

2. Locknut assembly according to claim 1, characterized in that the wedge (13) and the wedge cavity (23) are an interference fit.

3. Locknut assembly according to claim 1, characterized in that the surface of the wedge (13) facing the second nut body (21) is a first ramp, the bottom of the wedge cavity (23) is a second ramp, the first and second ramps cooperating.

4. Locknut assembly according to claim 3, characterized in that the direction of inclination of the first ramp corresponds to the direction of rotation of the female nut (2).

5. Locknut assembly according to claim 3 or 4, characterized in that the slope of the first ramp is greater than the lead angle of the male nut (1) and the slope of the second ramp is greater than the lead angle of the female nut (2).

6. The locknut assembly of claim 1 wherein the taper of the frustum (12) is less than 8 ° and the mating surface of the frustum (12) and the tapered bore (22) is greater than 75%.

7. The locknut assembly of claim 6 wherein the interference fit tolerance level of the tapered bore (22) and the frustum (12) is IT 4-IT 8.