CN116292571A

CN116292571A - Nut, anti-loosening structure thereof, anti-loosening screw pair and processing method

Info

Publication number: CN116292571A
Application number: CN202310349573.4A
Authority: CN
Inventors: 杨富云
Original assignee: Individual
Current assignee: Individual
Priority date: 2023-03-29
Filing date: 2023-03-29
Publication date: 2023-06-23

Abstract

The invention discloses a nut, a locking structure thereof, a locking screw pair and a processing method. A nut (1) is characterized in that: the end face of the screw is a convex surface (8) which is smaller than a semicircular plane (12), the height of the screw is at least 1/10-1 times of the tooth pitch of the internal screw thread (6), and the cross section of the screw is of any shape; in addition, the end face larger than the half hexagon is the end face with the oblique angle removed. Anti-loosening structure (11), main nut (2) are twisted on screw rod (5) with assisting nut (3) butt, characterized in that: either the main nut (2) or the auxiliary nut (3) is a nut (1), and the convex surface (8) is positioned between the two. The anti-loosening screw pair (13) is characterized in that: the fixed end (10) of the bolt (4) is of a locking structure (11), and the convex surface (8) enables the internal thread (6) of the auxiliary nut (3) and the external thread (7) of the bolt (4) to fall obliquely and lock. The anti-loose nut overcomes the defects that the anti-loose nut is high in processing cost, the screw (5) is easy to bend and is not reusable, and is used for fastening and anti-loose of vibration machinery. Also discloses a plurality of processing methods of cold heading, cutting and polishing.

Description

Nut, anti-loosening structure thereof, anti-loosening screw pair and processing method

Technical Field

The invention relates to the field of anti-loosening fasteners, in particular to a chamfer nut, an anti-loosening structure, an anti-loosening screw pair and a processing method thereof.

Background

The existing double-nut friction is loose-proof, two nuts with the same rotation direction are oppositely propped against the outer wire of the same bolt, and are oppositely screwed down, so that a propping force is generated between the two nuts, friction is generated between the lower main nut and the spring pad, friction is generated between the lower main nut and the upper auxiliary nut, the double friction achieves the effect of pre-tightening, and after severe vibration, the parallel thread double-nut loose-proof structure still can quickly loose.

To this end, prior art CN204493402U provides a locknut structure comprising a flat nut and a beveled nut. One end face of the inclined nut is an entire inclined face, an included angle is formed between the inclined face and a vertical line of a screw hole axis of the inclined nut, the flat nut and the inclined nut are sequentially arranged on the bolt, and the matched contact faces of the two nuts comprise the inclined face and are sequentially screwed. The inclined plane is not perpendicular to the axis of the bolt, and the upper part generates a certain bending moment on the bolt, and the bending moment enhances the anti-loosening effect. This solution has the following drawbacks: 1. because the main nut and the auxiliary nut are flat nuts and the other is a whole inclined plane nut, after the main nut and the auxiliary nut are pre-tightened on the same bolt, the contacted plane is in full contact with the whole inclined plane, and the phenomenon that the screw rod of the bolt bends to one side at the full contact surface is avoided; 2. because the bolt is bent, the bolt can only be used once and can not be reused; 3. because the bolt is deformed and bent by tightening the screw threads between the two nuts, the nut with the downward bending position cannot be disassembled, and the nut can be used once; 4. the inclined surface of the inclined surface nut is processed by a die or a cutting means, so that the inclined surface nut is complex in processing and wastes materials, and the cost is high; 5. the yield strength and the tensile strength of the bolt are greatly reduced due to the bending of the screw rod of the bolt, and the bolt can be subjected to yield fracture from the bending part of the screw rod when in severe vibration; 6. because the respective shafts of the flat nut and the inclined nut are coaxial with the bolt shaft of the section pre-tightened by the flat nut and the inclined nut respectively, namely, each thread tooth of the flat nut and each thread tooth of the inclined nut are parallel to the thread tooth surface of the screwed bolt of the section respectively, one surface of each thread tooth is contacted and stretched, the axis of the nut and the axis of the bolt are coaxial, and when the nut vibrates and is free to move, the nut easily vibrates, moves back and loosens on the outer wire of the screw without friction force.

The prior art CN217582823U of my discloses a nut, its locknut structure and lockscrew pair, nut characterized in that: the ring plane of the nut is provided with fixed salient points, the height of the salient points is at least 1/10-1 times of the pitch of the internal thread of the nut, and the cross section of the salient points is of any shape. Firstly, the point tip of the salient point is a point, only one point is contacted with the circular ring plane of the main nut or the auxiliary nut, the area of the contacted point is very small, in practical application, the extrusion force born on the point cannot be too large, if the extrusion force is too large, the pressure of the point tip can be too large, the point tip of the salient point is crushed, the whole salient point is still caused, and the salient point can not press the main nut to prevent the backing; secondly, the cross section of the bump perpendicular to the height is of any shape, but the whole bump is a point, all the cross sections are all cross sections of any shape with limited size of the bump, and the bump cannot bear too much pressure; thirdly, the cold heading process of the convex point is arranged on the circular ring plane of the nut body, when the convex point is extruded out of the convex point on the very narrow circular ring plane due to the fact that the extruding pressure is very high, the edge of the die is easy to extrude and collapse, and the production cost is greatly increased.

Disclosure of Invention

In order to overcome the defects in the prior art, the nut, the anti-loosening structure, the anti-loosening screw pair and the processing method thereof aim to provide the nut which can not reduce the anti-loosening force of the main nut, but can not crush the anti-loosening convex points, is reliable in anti-loosening, can be reused, and is simple in processing technology and low in processing cost.

The utility model provides an asymmetric contact surface chamfer nut, including ordinary nut, or locknut, the periphery is hexagonal, or square, the center has the round hole, the inboard of round hole has the screw thread, the screw shaft is coaxial with the bolt shaft, the ring plane at nut both ends with the screw shaft is perpendicular, its characterized in that:

the hexagonal side of the nut body of a common nut or locknut rotates to any angle around the symmetry axis of the common nut or locknut, then an inclined plane forming an angle of 90 degrees plus alpha relative to the symmetry axis is used for cutting off the inclined end angle of one end of the nut body, a nut with a missing end angle is obtained, and the left end face is less than half of the end face, but the left convex face with zero area and half of the original end area is not included;

alpha is the inclination angle of one end of the nut body;

one end of the common nut or the locknut is provided with the circular plane convex surface;

the convex surface is integrated with the common nut or the locknut in a homogeneous way.

Further, the height of the protruding points is at least 1/10-1 times of the thread pitch in the common nut or the locknut screw hole.

Further, the cross section of the convex surface perpendicular to its height is of arbitrary shape.

Further, the convex surface and the circular ring plane are fixed integrally, or are formed by cold heading with a common nut or a die integrated with a locknut; or cutting with integral hexagonal rod; or cutting the mixture by using a cold-headed or red-punched hexagonal nut.

Further, the common nut is a fixing tool, a hole is formed in the center of the common nut, threads are formed in the inner side of the hole, regular hexagonal sides or square corners which are symmetrical with each other are formed around the hole, the common nut is connected with external threads of bolts with the same specification in a screwed mode through internal threads of the round holes, a fastened piece A and a fastened piece B are fastened between the bolt head and the common nut in a screwed mode, and circular ring planes which are parallel to each other and perpendicular to a screw hole shaft are arranged at two ends of the common nut.

Further, the locknut comprises a nut body and an annular elastic locking piece, wherein the annular elastic locking piece is arranged at the other end of the nut body and is of an integral structure with the nut body, and the annular elastic locking piece is bent towards the inner side of the nut body with threads and forms an annular channel with the nut body; the inner diameter of the annular elastic locking piece is smaller than that of the inner threaded part of the nut body, or the annular elastic locking piece and the inner threaded part of the nut body are slightly axially or radially staggered, and the annular elastic locking piece is made of metal or nylon.

Further, a coating is arranged on the internal thread of the screw hole of the common nut, and rubber or non-setting gelatinous substances are coated on the coating and used for increasing the friction force between the nut and the bolt.

The nut has better anti-loosening effect if being matched with the existing anti-loosening nut, and is mainly used for preventing loosening; when the nut is in a free loosening state, the existing locknut acts to prevent the free movement of the nut, temporarily fix the nut and wait for the vibration fastening of the next period, thus the locknut has better locking effect-!

The anti-loosening structure comprises

The main nut is used for screwing the fixed end of the bolt,

the auxiliary nut is used for being screwed on the fixed end of the bolt and is positioned at the outer side of the main nut,

the external thread of the screw rod of the bolt is used for coaxially screwing the internal threads of the main nut and the auxiliary nut,

the method is characterized in that:

one of the main nut and the auxiliary nut is a common nut or a locknut, and the other is the nut;

when the nut is a main nut, the convex surface of the nut is fixed on the circular ring plane at one end of the main nut, and the top line of the convex surface is in spiral line contact with the circular ring plane at one end of the auxiliary nut screwed on the bolt; continuously tightening the auxiliary nut, and changing the top line of the convex surface into surface contact with the circular plane spiral at one end of the auxiliary nut rotating on the bolt;

when the nut is an auxiliary nut, the convex surface of the nut is fixed on the circular ring plane at one end of the auxiliary nut, and the top line of the convex surface is in spiral line contact with the circular ring plane at one end of the main nut screwed on the bolt; continuing to screw the auxiliary nut, changing the top line of the convex surface into surface contact with the circular plane screw at one end of the screwed main nut on the bolt;

when the convex top line or surface on one nut is contacted with the circular ring plane spiral line or surface at one end of the other nut, the main nut uses the gap between the internal thread of the auxiliary nut and the external thread of the bolt to lead the surface of the internal thread of the auxiliary nut and the surface of the external thread of the bolt to fall off, the auxiliary nut is locked by unidirectional rotation in the loosening direction, the top line or surface of the convex surface blocks the main nut, and the main nut can only be screwed and cannot be loosened, thereby playing the role of stopping loosening and preventing loosening;

or the main nut and the auxiliary nut are oppositely screwed by a certain pretightening force, and the anti-loosening structure locks the main nut and the auxiliary nut in a bidirectional spiral manner and is fixed on the screw rod of the bolt to form the anti-loosening structure.

The anti-loosening screw pair is characterized in that: comprising

One end of the bolt is a bolt head, and the other end of the bolt is a fixed end;

the anti-loosening structure is arranged at the fixed end of the bolt;

the first fastened piece and the second fastened piece are installed and fastened between the bolt head and the anti-loosening structure;

in some modes, a main flat washer or a main elastic washer is respectively arranged between the anti-loosening structure and the fastened component A, and the main flat washer is positioned between the main elastic washer and the fastened component A;

the main elastic washer is one of an opening circular spring washer, a conical surface disc-shaped elastic washer, a spherical disc-shaped elastic washer or any elastic washer;

in some aspects, no primary flat washer or no primary spring washer is provided between the anti-loosening structure and the fastened item a.

The anti-loosening principle of the invention is as follows: the improvement on the basis of the common double-nut opposite-jacking screw is characterized in that at any position of the circular plane contact surface between the common double nuts, the gap between the internal thread of the auxiliary nut and the external thread of the bolt is utilized to enable the internal thread of the auxiliary nut and the external thread of the bolt to be inclined, two threads which are originally in parallel and spirally meshed with each other are inclined, the functions of mutually inclined intersection, mutual prying and spiral lateral force are achieved, the loosening direction is locked and stretched, the friction force between the internal thread of the auxiliary nut and the external thread of the bolt is suddenly increased, so that the convex surface is fixed relative to the bolt and cannot be rotated, and when the main nut is in loosening, the convex surface props against the auxiliary nut, the lateral force of the auxiliary nut is further increased, the anti-loosening purpose is achieved, and the main nut is screwed and cannot be rotated in the loosening direction. If the main nut and the auxiliary nut are screwed on the screw rod of the bolt, the main nut, the auxiliary nut and the bolt are coaxially and firmly bound into a whole, and the main nut, the auxiliary nut and the bolt cannot be retreated at all.

Only after the auxiliary nut is loosened by tools such as a spanner, the convex surface can be far away from the main nut or the auxiliary nut, the main nut can be loosened again, and finally the bolt can be disassembled, and the bolt can be pulled out of the screw hole of the fastened piece, so that the bolt can be repeatedly disassembled and assembled for use.

The invention relates to a nut processing method, which comprises the steps of extruding and forming an existing common nut or a ring plane at one end of the existing locknut by using a hole nut mould with an end face bevel angle to be removed by using a cold heading process, and pressing a convex surface on the ring plane at one end of the common nut or the existing locknut; or one end of the common nut or the existing locknut is milled by a milling cutter; or cutting with a cutter or turning with a lathe; or printing with a 3D printer; or grinding by using a grinding wheel and a file wheel to remove an oblique angle, wherein the height of the convex surface on the annular plane of the end surface is at least 1/10-1 times of the pitch of the internal thread of the conventional common nut, the end surface of the annular plane is an annular plane with less than half of the area, the annular plane does not comprise a complete oblique end surface with a complete zero area, the end surface of the annular plane with the convex surface being half of the area is not included, and the cross section of the convex surface with the vertical height is in any shape; the other half is an end surface which does not comprise the whole hexagonal end surface and is chamfered, the degree of the bevel angle is alpha, alpha is 0-30 degrees, and the maximum thickness of the hexagonal chamfer at one end of the beveled nut body is at least 1/10-1 times of the pitch of the internal thread of the nut body; the end face angle of the obliquely cut nut body is larger than half of the end face of the nut body, but does not exceed or include the oblique section of the whole nut body, namely the original end face of the nut body with less than half of the end face left.

In summary, the nut, the anti-loosening structure, the anti-loosening screw pair and the processing method have the following advantages:

1. the invention based on the existing fastener has strong universality;

2. the anti-loosening structure comprises a main nut, an auxiliary nut and a bolt, and can be used upside down on a screw rod, so that the actual requirements can be met;

3. the cold heading process is used for production, so that the processing production process is simpler, the processing speed is faster, the processing cost is lower, the die structure can not collapse the die, and the cost for frequent replacement of the die is saved;

4. the device is convenient to install and operate, and special tools are not needed;

5. the anti-loosening performance is good, when the auxiliary nut is fastened, the main nut can only be fastened and cannot be loosened, and the main nut does not loose at all after vibrating, so that the point contact between the auxiliary nut and the main nut disclosed in the prior CN217582823U is updated to be in line contact or surface contact, the anti-loosening performance of the product is more stable, the structure of the product is more firm, the convex surface is more wear-resistant compared with the original convex point, and the service life is longer;

6. the anti-loosening structure and principle of the scheme are compared with the nearest prior art CN204493402U, the anti-loosening structure principle, the using effect and the processing technology of the anti-loosening structure and principle are completely different, the auxiliary nut, the main nut and the bolt are still the same axis after being installed, the upper circular ring plane of the main nut and the lower circular ring plane of the auxiliary nut are not in direct contact, but form an angle, and after being fully pre-tightened, the anti-loosening structure and the principle are in clearance, and the direct contact is a convex top line or surface. The bolt bears the pretension pulling force, bears a small amount of side force, just can make main nut, auxiliary nut and bolt fastening an organic whole, and the axle of bolt is not crooked after using, does not influence yield strength and tensile strength, and after the pretension, main nut, auxiliary nut, bolt fastening as an organic whole relatively can not become flexible at all, therefore locking reliability is high, and does not damage original all accessories in the use, easy dismounting, repeatedly usable, simple structure.

Drawings

FIG. 1 is one of the front views of a nut of the present invention;

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

FIG. 3 is a view showing the construction of the installation of FIG. 1 in a loose-proof screw pair;

FIG. 4 is another mounting block diagram of the anti-loose thread set of FIG. 1;

FIG. 5 is a second upper oblique view of a nut of the present invention;

FIG. 6 is a schematic view of the cross-sectional A-A configuration of FIG. 5;

FIG. 7 is a bottom view of FIG. 5;

fig. 8 is a mounting structure view of the locking screw pair of fig. 5.

In the figure:

1. a nut; secondly, a main nut; thirdly, assisting the nut;

4. a bolt; fifthly, a screw rod; sixthly, internal threads;

7. an external thread; eighth, convex surface; sixthly, a bolt head;

10. a fixed end; 11, an anti-loosening structure; 12, a circular ring plane;

13. an anti-loosening screw pair; 14, screw holes; 15, one end of the nut;

16. a nut body; 17, an annular channel; 18, annular elastic locking pieces;

19. a strip-shaped incision; 20, concave indentation; 21, locknuts;

22. a fastened member A; 23, fastening the second fastening piece; 24, a top line or surface of the convex surface;

25. a common nut; 26, limiting step combination; a main flat gasket;

28. a main spring washer; 29, coating; 30, hexagonal side surfaces;

31. the other end of the nut; 32, a gap between the main nut and the auxiliary nut;

33. a gap between the internal thread of the auxiliary nut and the external thread of the screw rod; 34, a dish-shaped elastic washer;

35. an inclined plane;

alpha, the angle of the bevel angle at one end of the nut body;

beta. The included angle between the main nut and the auxiliary nut.

Detailed Description

The invention will now be further described with reference to the accompanying drawings and examples:

the nut 1 is an asymmetric end face locknut, namely, the convex face 8 is offset to one side of one end face of the nut, and the left part is below half of the end face, but does not comprise the convex face 8 of the circular ring plane 12 with the left area of zero and half of the original end area; the cut or milled or upset or red end lack angle of the lack nut is offset to the other side of one end of the nut and is more than half end face, but not the whole inclined end face, the hexagonal side of the common nut body can rotate to any angle around the symmetry axis, then the inclined end angle of one end of the nut body 16 is cut by an inclined plane relative to the symmetry axis, and the hexagonal nut is obtained. Can be applied to various opposite-top anti-loosening structures 11 and anti-loosening screw pairs 13.

In fig. 1 to 8, a nut 1 comprises a conventional common nut 25 or a circular ring plane 12 at one end of a conventional locknut 21, and is formed by extrusion molding with a die cold heading process of a hole nut with an end face bevel angle to be removed, and a convex surface 8 is pressed on the circular ring plane 12 at one end of the common nut 25 or the conventional locknut 21; or milling off one end of the common nut 25 or the existing locknut 21 by a milling cutter, or cutting off by a cutter, or turning off by a lathe, or printing by a 3D printer, or polishing off an oblique angle instead of the whole oblique surface end, wherein the angle alpha of the oblique angle of one end of the milled or cut-off or turned-off nut body by the lathe is 0-30 degrees, preferably such as alpha is 4 degrees, 5 degrees, 6 degrees or 8 degrees, and the maximum thickness of the hexagonal cutting angle of one end of the obliquely-removed nut body 16 is at least 1/10-1 times of the pitch of the internal thread 6 of the nut body 16; the beveled cut-out nut body 16 should be greater than half of the end face of the nut body 16, but not exceed and include the chamfer of the entire nut body 16, i.e., the original end face of the nut body 16 leaving a small portion. The height of the convex surface 8 on the circular plane 12 is at least 1/10-1 times of the pitch of the internal thread 6 of the screw hole 14 of the existing common nut 25 or the existing locknut 21; the end face of the circular ring plane 12 is a circular ring plane 12 below half, the circular ring plane 12 does not comprise a complete inclined end face with a complete zero area, the cross section of the convex surface 8 perpendicular to the height is of any shape, the other half is an end face which does not comprise a complete hexagonal end face and is provided with a bevel angle, the height of the bevel angle is alpha, and the thickness of the cut bevel angle end face is at least 1/10-1 times, preferably 1/2, 2/3, 4/5 or 1 times of the pitch of the internal thread 6.

The internal thread 6 of the nut 1 is provided with a coating 29, and the coating 29 is made of rubber or non-setting gelatinous matter and is used for increasing the friction between the nut and the bolt and preventing the auxiliary nut 3 from being in a free loosening state when vibrating.

A concrete processing method of the nut is characterized in that: comprises any one of the following six processing methods,

a first machining method, horizontally placing one end face of the existing common nut 25 or locknut 21, then inclining the upper end face of the horizontal nut to one side for an angle alpha, fixing the nut by a clamp, milling a corner of the end face of the nut body 16 which is obliquely protruded upwards by a milling cutter vertical to a horizontal plane, wherein the milling depth or thickness is at least 1/10-1 times of the pitch of the internal thread 6 of the nut body 16 downwards from the highest point of the nut body 16, and the area of the upper end of the milled nut body 16 is between 1/2 to the whole inclined area, but not including 1/2 and the whole inclined area; the internal thread opening and the outer hexagonal end edge of the nut after cutting or cutting processing are provided with burrs or flash edges, and the burrs are removed by chamfering, wherein the chamfer is preferably 30 degrees, 45 degrees or 60 degrees, so that the nut is smoother and more attractive;

the second processing method comprises the following steps: cutting off the protruding end face bevel angle of the nut body by using a cutting tool, or processing the hexagonal rod into a nut by using a cutting and turning lathe, wherein other processing technologies are the same as that of processing a common nut, and the specific angle area, the specific size, the specific depth or the specific thickness are the same as those described above;

the third processing method comprises the following steps: clamping and fixing the axle center and the off-axis alpha angle of the nut body 16 by using a clamp, then rotating the clamp, and turning the end face bevel angle of the nut body 16 to be removed by using a fixed cutter, wherein the specific angle, area, size, depth or thickness are the same as the above;

the fourth processing method comprises the following steps: polishing one end of the nut body 16 with a polishing tool such as a grinding wheel, file, rasp wheel, etc. to remove an end face bevel angle, and specifically polishing the end face at an angle, area, size, depth or thickness as described above;

the fifth processing method comprises the following steps: the blank is directly formed by cold heading or hot stamping with a cavity common nut 25 or a locknut 21 with an end face bevel angle to be removed, and the cavity part of the die is just the shape and the size of the asymmetric end face locknut which is required and is left by removing the end face bevel angle, and the internal thread 6 or a blank which is formed by cold heading is formed by using a tap or a threading, and the process is implemented by a common technician and is not repeated here;

the sixth processing method comprises the following steps: the method comprises the steps of 3D printing, namely designing a nut body 16 diagram with an end face bevel removed into a 3D diagram, printing out the nut by a 3D printer, wherein the shape, the area, the size, the specification, the depth or the thickness of the nut body are the same as those of the nut body, and the end face bevel is made of the same materials;

beta is the included angle between the main nut 2 and the auxiliary nut 3, and is generally 0-30 degrees, preferably 3-10 degrees, and beta is smaller than alpha after the auxiliary nut 3 is fastened on the screw 5 due to the clearance between the internal thread 6 of the auxiliary nut 3 and the external thread 7 of the bolt 4.

In fig. 5 to 8, a conventional locknut 21 comprises a nut body 16 and an annular elastic locking piece 18, wherein the annular elastic locking piece 18 is arranged at the upper end of the nut body 16 and is in an integral structure with the nut body 16; the annular elastic locking piece 18 is bent towards the inner side of the nut body 16 with threads and forms an annular channel 17 with the nut body 16; the annular resilient locking tab 18 may have an inner diameter that is smaller than the inner diameter of the threaded portion of the nut body 16 or the annular resilient locking tab 18 may be slightly axially or radially offset from the threaded portion of the nut body 16. The limit step combination 26 is composed of more than one semicircular steps; the strip-shaped notch 19, the concave indentation 20 or the annular elastic locking piece 18 is not arranged or is metal or nylon.

In fig. 3, the anti-loosening structure 11 of the present invention is formed by screwing the internal threads 6 of the main nut 2 and the auxiliary nut 3 on the external threads 7 of the screw 5 in opposite directions, the two nuts can exchange the positions of the two nuts, and the convex surface 8 is located between the main nut 2 and the auxiliary nut 1. The invention relates to a locking screw pair 13, which comprises a bolt 4, a locking structure 11 or a main flat washer 27 or a main elastic washer 28, wherein a convex surface 8 is arranged on a circular ring plane 12 at the lower end of the auxiliary nut 3 to form the nut 1, the fixed end 10 of the bolt 4 is penetrated into a screw hole 14 of a fastened piece B23, a fastened piece A22, the main flat washer 27, the main elastic washer 28 and the main nut 2, the auxiliary nut 3 is screwed on an external thread 7 of the exposed bolt 4 according to preset torque, the auxiliary nut 3 is a chamfered nut 1 with the convex surface 8, and when a top line or a surface 24 of the convex surface 8 screwed on the circular ring plane 12 at one end of the auxiliary nut 3 is contacted with the circular ring plane 12 on the main nut 2, a certain pre-tightening torque is applied to enable the internal thread of the nut 1 formed by the main nut 2 and the auxiliary nut 3 with the convex surface 8 to be tightly fixed on the external thread 7 of the bolt 4, and the main nut 2, the auxiliary nut 3, the main flat washer 27, the main elastic washer 28 and the fastened piece A23 are firmly fastened on the fastening piece A. After the main nut 2 and the auxiliary nut 3 are respectively pre-tightened, due to the adding and separating action of the convex surface 8, the internal thread 6 of the auxiliary nut 3 is inclined on the external thread 7 of the screw 5 by utilizing the gap 33 between the internal thread 6 of the auxiliary nut 3 and the external thread 7 of the bolt 4, and the main nut 2 and the nut body 16 of the auxiliary nut 3 are not contacted and have a beta angle gap, so that the auxiliary nut 3 can be sufficiently inclined, locked on the external thread 7 of the screw 5 and cannot rotate backwards.

In fig. 4, the main nut 2 is a nut 1 according to the present invention, the auxiliary nut 3 is a common nut 25, the convex surface 8 is disposed between the main nut 2 and the auxiliary nut 3, and is integrated with the main nut 2, and the auxiliary nut 3 or the internal thread 6 is provided with a coating 29 for preventing the auxiliary nut 3 from loosening freely, and other structures and principles are the same as those described in fig. 3.

In fig. 8, the nut body 16 of the auxiliary nut 3 is one of the existing locknuts 21, the circular plane 12 at the lower end of the auxiliary nut 3 is provided with a convex surface 8, so as to form the nut 1 of the invention, the locknut 21 of the auxiliary nut 3 is used for preventing the auxiliary nut 3 from loosening freely, the main flat washer 27 and the main elastic washer 28 are not arranged, and other installation structures and principles are the same as those in fig. 3 and are not repeated.

A main flat washer 27 or a main elastic washer 28 is respectively arranged between the anti-loosening structure 11 and the fastened component A22 in figures 3 and 4, and the main flat washer 27 is positioned between the main elastic washer 28 and the fastened component A22; any gasket can be omitted; wherein the primary spring washer 28 is either an existing split circular spring washer, an existing conical disk spring washer, an existing spherical disk spring washer, or any of the existing spring washers.

The main spring washer 28, the main flat washer 27, the common nut 25, the locknut 21 and the bolt 4 are all well known in the art, and the structure, the working principle, the material, the specification and the selection method thereof should be known to those skilled in the art and will not be repeated here.

The three mounting modes respectively correspond to different thicknesses, thread arrangement modes, different materials and different specifications of nuts, the main nut 2 and the auxiliary nut 3, one nut with the convex surface 8 or the existing nut, and the three mounting modes achieve the same anti-loosening purpose, but one convex surface point 8 is designed on the upper circular ring plane 12 of the main nut 2; one is designed on the lower annular flat surface 12 of the auxiliary nut 3, which functions the same.

Experiments prove that: when the main nut 2 is in back rotation, the convex surface 8 enables the auxiliary nut 3 to be spirally and obliquely arranged on the external thread 7 of the screw rod 5 of the bolt 4, so that the main nut 2 is locked in a unidirectional rotation mode in the back rotation direction, and the convex surface top line 24 of the convex surface 8 tightly props against the spiral of the main nut 2 to rise.

The nut 1 is formed by fixing a convex surface 8 on a circular ring plane 12 at one end of an existing common nut 25 or an existing locknut 21, wherein the convex surface 8 is made of stainless steel, carbon steel, manganese steel, alloy steel, iron, copper or other metals which are homogeneous with the nut, and the nut, a locking structure, a locking screw pair and a processing method are formed.

For convenience and intuitiveness, the nut can be simply called as a chamfer locknut or a chamfer nut, is more definite and clear, can be distinguished from other nuts and is convenient for communication.

Finally, it should be noted that: the above embodiments are only for illustrating the technical scheme of the present disclosure, but not for limiting the same; while the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art will appreciate that; the specific embodiments of the present disclosure may be modified or some technical features may be replaced equivalently, without departing from the spirit of the technical disclosure, and they are all covered in the scope of the technical disclosure.

Claims

1. The utility model provides a nut, includes ordinary nut (25), or locknut (21), and the periphery is hexagonal, or square, and there is the round hole in the center, and there is internal thread (6) the inboard of round hole, and screw (14) axle and bolt (4) axle coaxial, ring plane (12) at nut (1) both ends with screw (14) axle is perpendicular, its characterized in that:

the hexagonal edge of a nut body (16) of a common nut (25) or a locknut (21) rotates to any angle around the symmetry axis, then an inclined plane (35) forming an angle of 90 degrees plus alpha relative to the symmetry axis is used for cutting off the inclined end angle of one end of the nut body (16), a nut (1) with a missing end angle is obtained, and the left end surface is less than half of the end surface, but the convex surface (8) with zero area and half of the original end area is not left;

alpha is the angle of an oblique angle at one end of the nut body (16);

one end (15) of the common nut (25) or the locknut (21) is provided with the convex surface (8) of the circular plane (12);

the convex surface (8) and the common nut (25) or the locknut (21) are integrated into a whole.

2. A nut as defined in claim 1, characterized in that: the height of the convex surface (8) is at least 1/10-1 times of the tooth distance of the internal thread (6) of the screw hole (14) of the common nut (25) or the locknut (21).

3. A nut as defined in claim 1, characterized in that: the cross section of the convex surface (8) perpendicular to the height thereof is of any shape.

4. A nut as defined in claims 1-4, characterized in that: the convex surface (8) and the circular ring plane (12) are fixed integrally, or are formed by cold heading of a die integrated with a common nut (25) or a locknut (21); or cutting with integral hexagonal rod; or is formed by cutting the cold-headed hexagon nut.

5. A nut as defined in claim 1, characterized in that: the common nut (25) is a fixing tool, a hole is formed in the center of the common nut, threads are formed in the inner side of the hole, regular hexagonal sides or square corners which are symmetrical with each other are formed around the hole, the common nut is connected with external threads (7) of bolts (4) of the same specification in a screwed mode through internal threads (6) of the round holes, a fastened piece A (22) and a fastened piece B (23) are fastened between a bolt head (9) and the common nut (25) in a screwed mode, and circular ring planes (12) which are parallel to each other and perpendicular to the axis of the screw hole (14) are arranged at two ends of the common nut.

6. A nut as defined in claim 1, characterized in that: the locknut (21) comprises a nut body (16) and an annular elastic locking piece (18), wherein the annular elastic locking piece (18) is arranged at the other end (31) of the nut body (16) and is of an integrated structure with the nut body (16), and the annular elastic locking piece (18) bends towards the inner side of a thread of the nut body (16) and forms an annular channel (17) with the nut body (16); the inner diameter of the annular elastic locking piece (18) is smaller than the inner diameter of the part of the internal thread (6) of the nut body (16), or the annular elastic locking piece (18) and the part of the internal thread (6) of the nut body (16) are slightly axially or radially staggered; the annular elastic locking piece (18) is metal or nylon.

7. A nut as defined in claim 1, characterized in that: a coating (29) is arranged on the internal thread (6) of the screw hole (14) of the common nut (25), and rubber or non-drying gelatinous substances are coated on the coating (29).

8. An anti-loose structure comprising

A main nut (2) for screwing a fixed end (10) of the bolt (4),

an auxiliary nut (3) which is used for being screwed on the fixed end of the bolt (4) and is positioned at the outer side of the main nut (2),

the external thread (7) of the screw rod (5) of the bolt (4) is used for coaxially screwing the internal threads (6) of the main nut (2) and the auxiliary nut (3),

the method is characterized in that:

the main nut (2) and the auxiliary nut (3), one of which is a common nut (25) or a locknut (21), and the other of which is a nut (1);

when the nut (1) is a main nut (2), the convex surface (8) of the nut is fixed on a circular ring plane (12) at one end of the main nut (2), and the top line or surface (24) of the convex surface (8) is in spiral point contact with the circular ring plane (12) at one end of an auxiliary nut (3) screwed on the bolt (4);

when the nut (1) is an auxiliary nut (3), the convex surface (8) of the nut is fixed on a circular ring plane (12) at one end of the auxiliary nut (3), and the top line or surface (24) of the convex surface (8) is in spiral point contact with the circular ring plane (12) at one end of the main nut (2) screwed on the bolt (4);

when the top line or surface (24) of the convex surface (8) on the nut (1) is in contact with the spiral surface of the circular ring plane (12) at one end of the other nut, the main nut (2) can only be screwed down due to the action of the top line or surface (24) of the convex surface (8) on the nut (1), and the action of stopping and locking can be achieved by utilizing the gap (33) between the internal thread (6) of the auxiliary nut (3) and the external thread (7) of the bolt (4) to enable the surface of the internal thread (6) of the auxiliary nut (3) to be inclined with the surface of the external thread (7) of the bolt (4), the auxiliary nut (3) is locked by unidirectional rotation in the loosening direction, and the top line or surface (24) of the convex surface (8) blocks the main nut (2);

or the main nut (2) and the auxiliary nut (3) are screwed down by a certain pretightening force, and the anti-loosening structure (11) is used for bidirectionally screwing and locking the main nut (2) and the auxiliary nut (3) and is fixed on the screw rod (5) of the bolt (4).

9. Anti-loosening screw pair is characterized in that: comprising

A bolt (4) with one end being a bolt head (9) and the other end being a fixed end (10); the anti-loosening structure (11) is arranged at the fixed end (10) of the bolt (4); wherein, the first fastening piece (22) and the second fastening piece (23) are installed and fastened between the bolt head (9) and the anti-loosening structure (11);

a main flat washer (27) or a main elastic washer (28) is respectively arranged between the anti-loosening structure (11) and the fastened part A (22), and the main flat washer (27) is positioned between the main elastic washer (28) and the fastened part A (22);

the main elastic washer (28) is one of an open circular spring washer, a conical surface disc-shaped elastic washer, a spherical disc-shaped elastic washer (34) or any elastic washer;

and a washer is not arranged between the anti-loosening structure (11) and the fastened member A (22).

10. A processing method of a nut is characterized in that: comprises any one of the following six processing methods,

the first processing method comprises the steps of horizontally placing one end face of an existing common nut (25) or locknut (21), then inclining the upper end face of the nut horizontally to one side for an angle alpha, fixing the nut by a clamp, milling off one corner of the end face of a nut body (16) which is obliquely protruded upwards by a milling cutter perpendicular to a horizontal plane, wherein the milling depth or thickness is at least 1/10-1 times of the pitch of an internal thread (6) of the nut body (16) downwards from the highest point of the nut body (16), and the milling area of the upper end of the nut body (16) is between 1/2 and the whole inclined area, but not comprises 1/2 and the whole inclined area; the cut or cut nut is smooth and attractive because burrs or flash are formed on the inner thread opening and the outer hexagonal end edge and removed by chamfering;

the third processing method comprises the following steps: clamping and fixing the axle center and the off-axis alpha angle of the nut body (16) by using a clamp, then rotating the clamp, and turning the end face bevel angle of the nut body (16) to be removed by using a fixed cutter, wherein the specific angle, area, size, depth or thickness are the same as those described above;

the fourth processing method comprises the following steps: polishing one end of the nut body (16) by using a polishing tool such as a grinding wheel, a file, a filing wheel and the like to remove a bevel angle of an end face, wherein the polishing angle, the area, the size, the depth or the thickness are the same as those described above;

the fifth processing method comprises the following steps: directly using a hole common (25) nut or a locknut (21) with an end face bevel angle to be removed to carry out cold heading or heating red forging process, extruding or forging to form, wherein the hole part of the die is just the shape and the size of the asymmetric end face locknut which is required and is left by removing the end face bevel angle, and the internal thread (6) of the die is the same as the shape and the size of the asymmetric end face locknut, or a blank which is subjected to cold heading is formed by using a screw tap or a threading;

the sixth processing method comprises the following steps: the method comprises the steps of 3D printing, namely designing a nut body (16) graph with the end face bevel removed into a 3D graph, printing out a nut by using a 3D printer, wherein the shape, the area, the size, the specification, the depth or the thickness of the nut, the end face bevel and the material are the same, and the materials are selected;

beta is the included angle between the main nut (2) and the auxiliary nut (3), is generally 0-30 degrees, preferably 3-10 degrees, and beta is smaller than alpha after the auxiliary nut (3) is fastened on the screw (5) due to the clearance between the internal thread (6) of the auxiliary nut (3) and the external thread (7) of the bolt (4).