CN210509898U

CN210509898U - Anti-loose nut

Info

Publication number: CN210509898U
Application number: CN201921252793.0U
Authority: CN
Inventors: 董爱民; 董荣根
Original assignee: Shanghai Jinke Machinery Manufacturing Co ltd
Current assignee: Shanghai Jinke Machinery Manufacturing Co ltd
Priority date: 2019-08-05
Filing date: 2019-08-05
Publication date: 2020-05-12
Anticipated expiration: 2029-08-05

Abstract

The utility model relates to a locknut, including the nut body, be equipped with the screw thread through-hole that is used for the screw in bolt on the nut body, the nut body includes nut and lower nut, and the nut passes through elasticity cylindric lock with the lower nut and is connected as an organic wholely, follows the equidistant a plurality of recess that is equipped with in screw thread through-hole periphery on the upper surface of lower nut, is equipped with bolt puller block in one of them recess, and bolt puller block is the slope contact surface with the contact surface of bolt contact, and the inclination of slope contact surface is 30 identical with the helicoid of bolt. The beneficial effects are that: the utility model discloses simple structure, locking is reliable, easy operation, enables the pretightning force between nut and the bolt and keeps for a long time and can not disappear, its low cost, and is effectual, is applicable to great member.

Description

Anti-loose nut

Technical Field

The utility model relates to a fastener, in particular to loose nut suitable for on large-scale component.

Background

The nut serves to securely connect two parts with a through hole, which is usually used in conjunction with a bolt or screw. Because the end face of the conventional nut is generally a smooth plane, when the nut is matched with a bolt or a screw rod to be fastened on two parts with through holes, the friction force between the nut and the connected parts can be very small, and particularly on a large-scale component, when the nut is vibrated by external force, the nut can be easily loosened along the thread on the bolt or the screw rod.

SUMMERY OF THE UTILITY MODEL

The utility model aims to solve the technical problem that a simple structure, locking effectual locknut is provided.

The technical scheme is as follows,

the utility model provides a locknut, includes the nut body, be equipped with the screw thread through-hole that is used for the screw in bolt on the nut body, its characterized in that, the nut body includes nut and lower nut, nut and lower nut pass through elastic cylindrical pin and are connected as an organic wholely be equipped with a plurality of recess along screw thread through-hole periphery equidistance on the upper surface of lower nut, be equipped with bolt puller block in one of them the recess, bolt puller block is the slope contact surface with the contact surface of bolt contact, the slope of slope contact surface is 30 and is identical with the helicoid of bolt.

As a further improvement, an inclined cone extrusion block is further arranged in the groove and is an inverted equilateral trapezoid extrusion block, the rear top surface of the groove is an inclined plane, and the inclined cone extrusion block is matched with the rear top surface of the groove and the side surface of the bolt jacking block in a shape fit manner.

As a further improvement, the inclination of the rear top surface of the groove, the inclination of the two side surfaces of the inclined cone extrusion block and the inclination of the side surface of the bolt puller block, which is contacted with the inclined cone extrusion block, are all 5 degrees.

As a further improvement, six pin shaft through holes are equidistantly formed in the upper nut, six pin shaft lower through holes are formed in the lower nut, the pin shaft lower through holes correspond to the pin shaft upper through holes one to one, the elastic cylindrical pin is inserted into any one of the pin shaft upper through holes and the pin shaft lower through hole corresponding to the pin shaft upper through hole, the upper nut and the lower nut are correspondingly connected into a whole, six grooves are formed, the bolt jacking block is placed in any one of the grooves, and the pin shaft lower through holes and the grooves are arranged at intervals.

As a further improvement, a loose dustproof sleeve matched with the upper nut in shape is arranged on the component matched with the lower nut.

Advantageous effects

The beneficial effects are that: the utility model discloses simple structure, locking is reliable, easy operation, enables the pretightning force between nut and the bolt and keeps for a long time and can not disappear, its low cost, and is effectual, is applicable to great member.

Drawings

The present invention will be further described with reference to the accompanying drawings and embodiments.

FIG. 1 is an exploded view of the present invention;

fig. 2 is a top view of the present invention;

FIG. 3 is a cross-sectional view taken along line B-B of FIG. 2;

FIG. 4 is an enlarged view of a portion E of FIG. 3;

fig. 5 is a sectional view of the portion C-C of fig. 2.

Reference numbers in the figures:

1. upper nut 11, pin shaft upper through hole 2 and lower nut

21. Threaded through hole 22, groove 23 and through hole under pin shaft

3. Bolt 4, elastic cylindrical pin 5 and bolt puller block

6. Oblique cone extrusion block 7, base body 8 and anti-loose dustproof sleeve

Detailed Description

In order to further understand and appreciate the structural features and advantages of the present invention, preferred embodiments and the accompanying drawings are described in detail as follows:

as shown in fig. 1-4, a locknut comprises a nut body, a threaded through hole for screwing in a bolt 3 is arranged on the nut body, the nut body comprises an upper nut 1 and a lower nut 2, the upper nut 1 and the lower nut 2 are connected into a whole through an elastic cylindrical pin 4, a plurality of grooves 22 are equidistantly arranged on the upper surface of the lower nut 2 along the periphery of the threaded through hole 21, a bolt puller block 5 is arranged in each groove 22, the contact surface of the bolt puller block 5 and the bolt 3 is an inclined contact surface, and the inclination of the inclined contact surface is 30 degrees and is matched with the spiral surface of the bolt 3, so that the purpose of the locknut is achieved. In order to make the screw surfaces of the bolt puller block 5 and the bolt 3 contact with a plurality of screw surfaces as much as possible, an inclined cone extrusion block 6 is further arranged in the groove 22, the inclined cone extrusion block 6 is an inverted equilateral trapezoid extrusion block, the rear top surface of the groove 22 is an inclined surface, and the inclined cone extrusion block 6, the rear top surface of the groove 22 and the side surface of the bolt puller block 5 are mutually attached through shape matching. And the inclination of the rear top surface of the groove 22, the inclination of both side surfaces of the inclined cone extrusion block 6, and the inclination of the side surface of the bolt tightening block 5 in contact with the inclined cone extrusion block are all 5 °.

Specifically, the nut is used for a hexagon nut, six corners can be conveniently screwed to align, six pin shaft through holes 11 are equidistantly arranged on the upper nut 1, six pin shaft lower through holes 23 are formed in the upper surface of the lower nut 2, the pin shaft lower through holes 23 correspond to the pin shaft upper through holes 11 one by one, the elastic cylindrical pin 4 is inserted into any one of the pin shaft upper through holes 11 and the pin shaft lower through hole 23 corresponding to the pin shaft upper through hole, the upper nut and the lower nut are connected into a whole in a corner-to-corner corresponding mode, the number of the grooves 22 is six, the bolt tightening block 5 is placed in any one of the grooves 22, the concave circles 23 and the grooves 22 are arranged at intervals, and the upper nut, the lower nut and the screw are locked by means of pressure pressed by the elastic cylindrical pin 4 and thrust of the bolt tightening block.

The working principle of the structure is as follows: screwing a bolt 3 into a screw hole on a base body 7, screwing a lower nut 2 on the bolt 3, screwing the lower nut 2 on the upper surface of the base body 7, putting a bolt jacking block 5 into an optional groove on the upper surface of the lower nut, wherein one end of the bolt jacking block 5, which is contacted with the bolt 3, is an inclined plane with an angle of 30 degrees and is just matched with the spiral surface of the screw thread of the bolt 3, putting an inclined cone extrusion block 6 into the groove to be attached with the bolt jacking block 5 which is put in before, screwing an upper nut 1 on the bolt 3 until the bottom surface of the upper nut 1 tightly presses the inclined cone extrusion block 6 to force the inclined cone extrusion block 6 to press downwards, and because the contact surface of the bolt jacking block 5 and the inclined cone extrusion block 6 is an inclined plane with an angle of 5 degrees, the bolt jacking block 5 can be extruded towards the axis direction of the bolt 3 when the bolt jacking block 5 is pressed downwards, when the hexagonal edges of the upper nut 1 and the lower nut 2 are aligned visually, and (3) driving the elastic cylindrical pin 4 into any one of the pin shaft through holes 11 until the elastic cylindrical pin 4 completely enters the pin shaft lower through hole 23 on the lower nut. At this time, the lower nut is subjected to two forces, wherein firstly, the bottom surface of the lower nut and the upper surface of the base body 7 are in a compressed state due to micro deformation generated by a spiral contact surface between two threads when the bottom surface of the lower nut 2 and the upper surface of the base body 7 are screwed, secondly, the inclined cone extrusion block 6 is downwards moved due to the pressure of the upper nut 1 on the upper surface of the inclined cone extrusion block 6, and the inclined cone extrusion block 6 and the bolt jacking block 5 are both provided with 5-degree inclined surfaces, so that the bolt jacking block 5 is forced to extrude to the axis of the bolt 3 to tightly jack the thread surface of the bolt 3, the lower nut 2 is forced to increase a radial fixing force, when the upper nut 1 is tightly pressed on the inclined cone extrusion block 6, the upper nut is subjected to an acting force with the same size and the opposite direction, so that the inner threads of the upper nut 1 and the spiral surface of the outer threads of the bolt 3 are also slightly deformed, and the upper nut 1 and the lower nut are completely in a mutually locked state taking, in order to prevent the loosening of the 6, the driving of the elastic cylindrical pin further completely eliminates the conditions required by the loosening of the nut and the bolt, thereby achieving the purpose of the locknut.

In order to enable the locknut to keep the required anti-loosening function for a longer time under the severe condition, a loosening dustproof sleeve 8 matched with the locknut in shape is arranged on the assembly after the upper nut 1 and the lower nut 2 are connected in a matching mode. The anti-loose dustproof sleeve can be made of aluminum material by stretching, and has simple manufacture and low cost. This locking dirt proof boot utilizes the nut to lock the bolt, the plastic deformation that produces between the screw thread produces huge pressure and frictional force on the helicoid that external screw thread and internal thread contacted, thereby prevented the bolt, the rotation of nut opposite direction has consequently played the bolt, the locking principle and the condition of first priority of nut, when the bolt of locking originally each other under the effect of vibrations for a long time, the nut can have the stress opposite with locking force to the helicoid to contact for a long time because of in locking, when external shock intensity and frequency reach the critical point of certain reinforce, the bolt, the spiral contact surface of nut just begins to produce little displacement, also be exactly whole bolt, the not hard up initial reason of nut. The biggest highlight of anti-loose dust-proof boot lies in that the hexagon of bolt and nut is in same angle scope (can not be completely at an angle in reality) as far as possible and is allowed to have deviation about 5 in the initial lock bolt nut, then apply external force (specialized tool) cover with anti-loose dust-proof boot on last nut and lower nut, because anti-loose dust-proof boot has been applyed external force and has been packed into, so can not have not become flexible and the condition of droing takes place, anti-loose dust boot has not only played the effect that fixing bolt nut does not produce relative pivoted, can also play dustproof effect when using large-scale component, the life of extension nut.

In summary, the present invention is only a preferred embodiment, and is not intended to limit the scope of the present invention, and all equivalent changes and modifications of the shapes, structures, features and spirit described in the claims of the present invention should be included in the scope of the present invention.

Claims

1. The utility model provides a locknut, includes the nut body, be equipped with the screw thread through-hole that is used for the screw in bolt on the nut body, its characterized in that, the nut body includes nut and lower nut, nut and lower nut pass through elastic cylindrical pin and are connected as an organic wholely be equipped with a plurality of recess along screw thread through-hole periphery equidistance on the upper surface of lower nut, be equipped with bolt puller block in one of them the recess, bolt puller block is the slope contact surface with the contact surface of bolt contact, the slope of slope contact surface is 30 and is identical with the helicoid of bolt.

2. The locknut of claim 1, wherein an inclined cone extrusion block is further arranged in the groove, the inclined cone extrusion block is an inverted equilateral trapezoid extrusion block, the rear top surface of the groove is an inclined surface, and the inclined cone extrusion block, the rear top surface of the groove and the side surface of the bolt jacking block are mutually attached through shape matching.

3. The locknut of claim 2 wherein the inclination of the rear top surface of the recess, the inclination of the two side surfaces of the tapered extrusion block and the inclination of the side surface of the bolt-holding block in contact with the tapered extrusion block are all 5 °.

4. The locknut of claim 1, wherein six upper pin through holes are equidistantly formed in the upper nut, six lower pin through holes are equidistantly formed in the lower nut, the lower pin through holes correspond to the upper pin through holes one by one, the elastic cylindrical pin is inserted into any one of the upper pin through holes and the corresponding lower pin through hole, so that the upper nut and the lower nut are correspondingly connected into a whole, the number of the grooves is six, the bolt tightening block is placed in any one of the grooves, and the lower pin through holes and the grooves are arranged at intervals.

5. The locknut of claim 1 wherein a form-fitting loose dust boot is provided on the assembly of said upper nut and said lower nut.