CN211901246U - Anti-loose nut - Google Patents

Abstract

The utility model relates to a locknut, including the nut body, the nut body has the hole, the hole includes the screw hole, the hole is still including the packing ring assembly slotted hole that is located the axial upper end position of screw hole, the internal diameter of packing ring assembly slotted hole is greater than the internal diameter of screw hole, packing ring assembly slotted hole lower extreme forms the spacing step face of lower extreme axial with screw hole linking department, the upper end of packing ring assembly slotted hole has the spacing terminal surface of upper end axial, the packing ring is equipped with the plastics ring in the packing ring assembly slotted hole, the plastics ring restriction is between the spacing step face of lower extreme axial and the spacing terminal surface of upper end axial, the external diameter of plastics ring and the external diameter adaptation of packing ring assembly slotted hole, the interior circumference. The tapping matching is realized through the plastic ring, and the anti-loosening device has the advantages of simple structure and good anti-loosening effect.

Description

Anti-loose nut

Technical Field

The utility model relates to a fastener technical field, what exactly said is locknut with self-locking function.

Background

Nuts and bolts are common fasteners. When a common nut is used for fixing a mechanical part in a bolt matching manner, the time is long due to mechanical movement or vibration, and the nut is easy to loosen, so that the fixed part is loosened or abnormally loud. In order to solve the problem of loosening of the nut, a large number of structural improvement designs are carried out, for example, in the prior art, a plastic ring is arranged in an inner hole of the nut, in the process of screwing the nut into the bolt, tapping is realized on the plastic ring by threads of the bolt, and therefore, the anti-loosening effect is realized by the plastic ring, for example, in the anti-loosening nut disclosed in patent document No. 201410477182.1, the existing anti-loosening nut achieves loosening prevention by means of meshing formed by tapping, and in some occasions with high loosening prevention requirements, the anti-loosening effect is still insufficient.

Disclosure of Invention

The utility model discloses the invention purpose: for overcoming the defects existing in the prior art, the utility model provides a simple structure, locking effectual locknut.

In order to achieve the above purpose, the utility model provides a following technical scheme:

the utility model provides a locknut, includes the nut body, the nut body has the hole, the hole includes the screw hole, the hole still including the packing ring assembly slotted hole that is located the axial upper end position of screw hole, the internal diameter of packing ring assembly slotted hole is greater than the internal diameter of screw hole, packing ring assembly slotted hole lower extreme forms the spacing step face of lower extreme axial with screw hole linking department, the upper end of packing ring assembly slotted hole has the spacing terminal surface of upper end axial, the packing ring is equipped with the plastics ring in the assembly slotted hole, the plastics ring restriction is between the spacing step face of lower extreme axial and the spacing terminal surface of upper end axial, the external diameter adaptation of plastics ring and the external diameter of packing ring assembly slotted hole, the internal circumference of plastics ring flushes with: an elastic washer is arranged between the plastic ring and the upper end axial limiting end face, so that an elastically compressible movable space is formed between the plastic ring and the upper end axial limiting end face.

Through adopting above-mentioned technical scheme, during the nut screw in bolt, the screw thread of bolt is to the interior circumference of plastic ring cutting tapping to play locking effect, when the screw thread contact of plastic ring and bolt, the screw thread of bolt implements the power of axial roof pressure to the plastic ring, and force plastic ring roof pressure elasticity packing ring, after the screw in certain distance, the screw thread of bolt realizes the tapping to the plastic ring, under the design like this, have axial locking power between the screw thread of plastic ring and bolt, thereby improve auto-lock, locking effect.

Preferably, the outer circumferential side of the plastic ring is provided with shallow grooves which are uniformly distributed at intervals in the circumferential direction and axially extend, a supporting bulge is formed between the adjacent shallow grooves, and the inner wall of the gasket assembly groove hole is provided with at least one convex rib which extends into the shallow grooves to realize circumferential stopping. Under this structural design, reduce the contact surface between plastics ring and the packing ring assembly slotted hole inner wall for the reliable roof pressure elasticity packing ring of plastics ring axial, protruding muscle can prevent that the plastics ring from rotating, guarantees that the tapping is smooth.

Preferably, a riveting edge is arranged at the position, corresponding to the top end port of the gasket assembly groove hole, on the nut body, and the riveting edge is turned inwards and riveted to form the upper end axial limiting end face. Under this structural design, carry out the riveting spacing after plastic ring, elastic gasket pack into, have the convenient advantage of processing.

Preferably, the elastic gasket is a rubber gasket, the axial upper end face of the rubber gasket is a plane, the axial lower end face of the rubber gasket is provided with a weakening device for improving contact elasticity, and the axial lower end face of the rubber gasket is elastically contacted with the plastic ring through the weakening device. Under this structural design, the rubber packing ring has certain elasticity, and rubber packing ring and riveting limit complex terminal surface are the plane simultaneously for the rubber packing ring is spacing reliable with riveting limit contact, and the rubber packing ring adopts the terminal surface that has the weakening device and contacts with the plastic ring, and the weakening device improves the contact elasticity of rubber packing ring and plastic ring, forms good contact elasticity for the plastic ring tapping in-process.

Preferably, the weakening device comprises grooves distributed along the circumferential direction of the rubber gasket and radially opened, and convex parts supported on the plastic ring are formed between adjacent grooves. With the structural design, the weakening device has a simple structure.

Preferably, the outer circumferential side of the rubber gasket extends axially with a positioning surrounding edge, and the positioning surrounding edge is sleeved on the end part of the plastic ring. Under this structural design, the rubber packing ring can overlap and realize the location on the plastic ring for the cooperation is more reliable, and the location that the rubber packing ring can be better when the riveting is simultaneously on the plastic ring, makes things convenient for the riveting operation.

Preferably, the bottom end of the nut body is integrally formed with a flange. Under this structural design, the flange can improve area of contact to improve locking effect.

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

Drawings

Fig. 1 is a schematic structural view of a locknut according to an embodiment of the present invention;

FIG. 2 is a schematic view of a nut body according to an embodiment of the present invention;

FIG. 3 is a first schematic view of an embodiment of the present invention;

FIG. 4 is a schematic structural view of a second elastic washer according to an embodiment of the present invention;

fig. 5 is a schematic structural view of a plastic ring according to an embodiment of the present invention.

Detailed Description

Referring to fig. 1-5, the utility model discloses a locknut, which comprises a nut body 1, the nut body 1 is a flange 11 nut with a flange 11 integrally formed at the bottom end, the nut body 1 is provided with an inner hole, the inner hole comprises a threaded hole 12, the inner hole further comprises a gasket assembly groove hole 13 positioned at the axial upper end of the threaded hole 12, the inner diameter of the gasket assembly groove hole 13 is larger than that of the threaded hole 12, a lower end axial limiting step face 131 is formed at the joint of the lower end of the gasket assembly groove hole 13 and the threaded hole 12, an upper end axial limiting end face 132 is arranged at the upper end of the gasket assembly groove hole 13, a plastic ring 2 is assembled in the gasket assembly groove hole 13, the plastic ring 2 is limited between the lower end axial limiting step face 131 and the upper end axial limiting end face 132, the outer diameter of the plastic ring 2 is matched with the outer diameter of the gasket assembly groove hole 13, and the inner circumferential surface of the plastic ring 2 is flush with the. When the nut is screwed into the bolt, the thread of the bolt cuts and taps the inner circumferential surface of the plastic ring 2, thereby achieving the anti-loosening effect. The nut body 1 is provided with a riveting edge 1-1 corresponding to the port of the top end of the gasket assembly slot 13, and the riveting edge 1-1 is turned inwards to be riveted to form the upper end axial limiting end face 132; an elastic washer 3 is arranged between the plastic ring 2 and the upper axial limiting end surface 132, so that an elastically compressible movable space is formed between the plastic ring 2 and the upper axial limiting end surface 132. When the plastic ring 2 is in contact with the threads of the bolt, the threads of the bolt exert axial jacking force on the plastic ring 2 and force the plastic ring 2 to jack the elastic washer 3, and after the bolt is screwed in for a certain distance, the threads of the bolt realize tapping on the plastic ring 2. The locking force under the screw-thread fit formed by the plastic ring 2 through the screw-thread self-tapping, and meanwhile, the plastic ring 2 has the axial locking force, and under the combined action, a good nut anti-loosening effect is achieved.

The elastic gasket 3 is a rubber gasket, the axial upper end face of the rubber gasket is a plane 31, the axial lower end face of the rubber gasket is provided with a weakening device for improving contact elasticity, and the axial lower end face of the rubber gasket is elastically contacted with the plastic ring 2 through the weakening device. The rubber gasket has certain elasticity, and simultaneously the rubber gasket is plane 31 with riveting blank side 1-1 complex terminal surface for the rubber gasket is spacing reliable with riveting blank side 1-1 contact, and the rubber gasket adopts the terminal surface that has the weakening device to contact with plastic ring 2, and the weakening device improves the contact elasticity of rubber gasket and plastic ring 2, forms good contact elasticity for plastic ring 2 tapping in-process.

Furthermore, the weakening device comprises grooves 32 which are distributed along the circumferential direction of the rubber gasket and are radially opened, and convex parts 33 which are supported on the plastic ring 2 are formed between the adjacent grooves 32. The weakening device has a simple structure. As a feasible solution of the present invention, the elastic washer 3 may also adopt a corrugated ring design.

The outer circumference side of the rubber gasket extends axially with a positioning surrounding edge 34, and the positioning surrounding edge 34 is sleeved on the end part of the plastic ring 2. The rubber gasket can be sleeved on the plastic ring 2 to realize positioning, so that the matching is more reliable, and meanwhile, the rubber gasket can be positioned on the plastic ring 2 better during riveting, so that the riveting operation is facilitated.

In order to enable the plastic ring 2 to reliably press the elastic gasket 3 in the axial direction, shallow grooves 21 which are uniformly distributed at intervals in the circumferential direction and extend in the axial direction are arranged on the outer circumferential side of the plastic ring 2, a supporting bulge 22 is formed between every two adjacent shallow grooves 21, and at least one convex rib which extends into the shallow grooves 21 to realize circumferential stopping is arranged on the inner wall of the gasket assembly groove hole 13. The contact surface between the plastic ring 2 and the inner wall of the gasket assembly groove hole 13 is reduced, the convex rib can prevent the plastic ring 2 from rotating, and the smooth tapping is ensured. The outer circumference side of the axial end part of the plastic ring 2 is provided with a sleeving groove 23, the positioning surrounding edge 34 is sleeved in the sleeving groove 23, and the length of the supporting protrusion 22 is limited in the sleeving groove 23.

Claims (7)

1. The utility model provides a locknut, includes the nut body, the nut body has the hole, the hole includes the screw hole, the hole still including the packing ring assembly slotted hole that is located the axial upper end position of screw hole, the internal diameter of packing ring assembly slotted hole is greater than the internal diameter of screw hole, packing ring assembly slotted hole lower extreme forms the spacing step face of lower extreme axial with screw hole linking department, the upper end of packing ring assembly slotted hole has the spacing terminal surface of upper end axial, the packing ring is equipped with the plastics ring in the assembly slotted hole, the plastics ring restriction is between the spacing step face of lower extreme axial and the spacing terminal surface of upper end axial, the external diameter adaptation of plastics ring and the external diameter of packing ring assembly slotted hole, the internal circumference of plastics ring flushes with: an elastic washer is arranged between the plastic ring and the upper end axial limiting end face, so that an elastically compressible movable space is formed between the plastic ring and the upper end axial limiting end face.

2. The locknut of claim 1, wherein: shallow grooves which are uniformly distributed at intervals in the circumferential direction and axially extend are formed in the outer circumferential side of the plastic ring, a supporting bulge is formed between every two adjacent shallow grooves, and at least one convex rib which extends into the shallow grooves to achieve circumferential stopping is arranged on the inner wall of the gasket assembling groove hole.

3. The locknut of claim 1, wherein: and a riveting edge is arranged on the nut body corresponding to the port of the top end of the gasket assembly groove hole, and the riveting edge is turned inwards and riveted to form the upper end axial limiting end face.

4. The locknut of claim 3 wherein: the elastic gasket is a rubber gasket, the axial upper end face of the rubber gasket is a plane, the axial lower end face of the rubber gasket is provided with a weakening device for improving contact elasticity, and the axial lower end face of the rubber gasket is formed by the weakening device and is in elastic contact with the plastic ring.

5. The locknut of claim 4, wherein: the weakening device comprises grooves which are distributed along the circumferential direction of the rubber gasket and are radially arranged, and convex parts supported on the plastic ring are formed between the adjacent grooves.

6. The locknut of claim 4, wherein: the outer circumference side of the rubber gasket extends axially to form a positioning surrounding edge, and the positioning surrounding edge is sleeved at the end part of the plastic ring.

7. The locknut of claim 1, wherein: the bottom end of the nut body is integrally formed with a flange plate.

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