CN111853033A

CN111853033A - Locking type elastic conical locknut

Info

Publication number: CN111853033A
Application number: CN202010548460.3A
Authority: CN
Inventors: 吴卫国; 杭锐; 姜世平; 于国军
Original assignee: Jiangsu University
Current assignee: Jiangsu University
Priority date: 2020-06-16
Filing date: 2020-06-16
Publication date: 2020-10-30

Abstract

The invention relates to a locknut, in particular to a locking type elastic conical locknut. It comprises the thick nut of in-band circular cone hole and the thin nut of outband circular cone boss, and a week has the arc cross section recess on the circular cone hole bottom pore wall in the thick nut, a week has the arc cross section arch along the circular cone top of the outer circular cone boss of thin nut, arc cross section arch and recess constitute locking mechanism, can make bolt and nut screw thread further lock in the axial after the assembly is accomplished, there is better locking stopping effect under the continuous vibration operating mode, and can not produce great radial shear stress to the bolt, reduce the adverse effect to the bolt. The invention has stable and reliable structure and convenient installation, and can be widely applied to parts with special requirements on looseness prevention of the fastener.

Description

Locking type elastic conical locknut

Technical Field

The invention relates to a locknut, in particular to a locking type elastic conical locknut. The upper thread of the bolt is further wedged axially, and the fastener is prevented from loosening under vibration.

Background

Bolt and nut cooperation are often used for the fastener in the aspect of production life and mechanical assembly etc. and traditional bolt and nut only relies on the screw thread to screw up and plays the fastening effect, and in some mechanical equipment, the vibration that the operation produced can lead to the not hard up of bolt and nut for equipment can not normally operate, causes the incident even.

At present, the locknuts have various forms, such as thread adhesive coating, double-nut fastening, eccentric distance nuts and the like, wherein the eccentric distance nuts have better locking effect and are widely applied to high-speed vehicles, but the requirements on processing precision are high, the yield is relatively low, the price is relatively high, and due to the difficulty in ensuring the precision, the locknuts need to be frequently overhauled and maintained in the service process, and the use cost is also high.

Patent CN201620897559.8 discloses a multiple locknut, which is composed of a female nut and a male nut, wherein a truncated cone-shaped cavity is arranged in the female nut, the wall of the cavity is smooth, the male nut is provided with a truncated cone, the center line of the truncated cone and the center line of a screw hole are provided with an eccentric distance, the maximum wall thickness part of the side wall of the truncated cone is provided with a deformation groove, and the end surface of the female nut, which is in contact with the male nut, is provided with a blind hole and a pin hole.

Patent CN106224355A discloses an elastic conical wedge-caulking locknut, which combines the plane wedge-caulking principle with the blind groove elastic shrinkage principle in the three-dimensional cone, and because the wedge-caulking of the cone and the tightening action of the blind groove eliminate the axial gap and the radial gap between the cone and the bolt thread, the purpose of locking and stopping is achieved. Although the method adopted by the patent can avoid the loosening of the nut, the bolt is subjected to the action of radial shearing force at the moment, and the service life of the bolt is greatly influenced.

Disclosure of Invention

Aiming at the defects in the prior art, the invention aims to provide a locking type elastic conical locknut which can not damage a bolt, overcomes the defect that the traditional nut is fastened only by threads, and has a better locking effect.

The technical scheme adopted by the invention is as follows: the locking elastic conical locknut consists of a thick nut with an inner conical hole and a thin nut with an outer conical boss, an arc-shaped section groove is formed in one circle of the hole wall of the bottom of the inner conical hole of the thick nut, and an arc-shaped section protrusion is formed in one circle of the top of the conical surface of the outer conical boss of the thin nut.

Furthermore, by screwing the thin nut with the outer conical boss, the outer conical boss is extruded with the hole wall of the inner conical hole to generate deformation in the screwing process until the arc-shaped section protrusion on the outer conical boss enters the arc-shaped section groove on the hole wall at the bottom of the inner conical hole, so that the bolt thread and the nut thread are further locked in the axial direction to form locking.

In the scheme, the thick nut with the inner conical hole is characterized in that a section of inner conical hole is processed at one end of a standard hexagonal nut, and an arc-shaped cross-section groove is drawn out from one circle of the wall of the bottom of the inner conical hole; the thin nut with the outer conical boss is characterized in that a section of outer conical boss is processed at one end of a standard hexagonal nut, and an arc-shaped section bulge is reserved on the top of a conical surface of the outer conical boss in a circle.

Furthermore, the taper sizes of the inner conical hole and the outer conical boss are matched, and the sizes of the arc-shaped section groove and the arc-shaped section bulge are matched; the outer cone boss is provided with four deformation grooves along the axial direction of the nut.

Furthermore, the small diameter of the conical hole of the thick nut with the inner conical hole is larger than the large diameter of the internal thread of the nut and is 0.3mm-1mm smaller than the small diameter of the conical boss outside the thin nut; the big diameter size of the conical hole of the thick nut with the inner conical hole is equal to the big diameter size of the conical boss outside the thin nut; the small diameter of the outer conical boss of the thin nut with the outer conical boss is larger than the large diameter of the inner thread of the nut.

Furthermore, the structural strength is ensured, the taper of the outer cone boss cannot be too large, the included angle between the conical surface and the central axis is 5-10 degrees, and the normal elastic deformation of the outer cone boss of the thin nut is ensured.

Furthermore, the thin nut with the outer conical boss is ensured to be normally screwed in and out, the inner conical hole wall of the thick nut needs to be smooth, the sizes of the arc-shaped cross section groove on the hole wall at the bottom of the inner conical hole and the arc-shaped cross section protrusion at the top of the conical surface of the outer conical boss cannot be too large, and the height of the arc-shaped cross section protrusion at the top of the conical surface of the outer conical boss is 0.5mm-1 mm.

Furthermore, the width of the deformation groove on the outer cone boss needs to be set to ensure that the deformation of each part of the outer cone boss is not interfered with each other, and the width of the deformation groove on the outer cone boss is 1-2 mm.

Compared with the prior art, the invention adopts the technical scheme, and has the following advantages:

1. the technical scheme mainly locks the threads of the nut and the bolt in the axial direction, and compared with the prior technical scheme, the adverse effect of radial shear stress on the bolt is reduced;

2. according to the technical scheme, the locking structure is added, so that the anti-loosening and retaining effects are better under the continuous vibration working condition;

3. after the technical scheme is designed, the later-stage machining precision is generally required, and the yield is improved.

Drawings

Fig. 1 is a schematic diagram of a thick nut with an internal conical hole in the locking elastic conical locknut of the invention.

Fig. 2 is a schematic view of a thin nut with an outer conical boss in the locking elastic conical locknut of the invention.

Fig. 3 is an assembly schematic diagram of the locking elastic cone locknut of the invention used on a standard bolt.

Description of reference numerals: 1-a groove with an arc-shaped cross section; 2-small diameter of the inner taper hole of the thick nut; 3-the inner conical hole of the thick nut has a large diameter; 4-large diameter of the boss of the outer cone; 5-small diameter of the boss of the outer cone; 6-deformation groove; 7-arc cross section is convex.

Detailed Description

The following further describes embodiments of the present invention with reference to the drawings.

As shown in fig. 1, 2 and 3, firstly, a thick nut with an inner conical hole is screwed on a bolt, the inner conical hole faces outwards, the thick nut is screwed to a force value required by installation by using a spanner, then a thin nut with an outer conical boss is screwed on the bolt, the outer conical boss faces the inner conical hole, the outer conical boss of the thin nut is screwed into the inner conical hole of the thick nut by using the spanner, and as the outer conical boss is provided with a deformation groove, each part of the outer conical boss deforms simultaneously along with the screwing of the thin nut until the arc-shaped section protrusion screwed on the outer conical boss is clamped into the arc-shaped section groove on the hole wall at the bottom of the inner conical hole, at the moment, the thick nut and the thin nut are connected into a whole, the threads of the bolt and the nut are further locked in the axial direction, and a good anti-loosening effect can be achieved under the continuous vibration working condition.

When the locking elastic conical locknut is disassembled, the protrusions on the outer conical boss and the grooves on the inner conical hole wall are both arc-shaped sections and have small radian, so that when the locknut is disassembled, the thin nut is screwed in the opposite direction only by using a spanner, and after the thin nut is completely withdrawn, all parts of the outer conical boss can reset, and the reuse is not influenced.

The above embodiments and descriptions are only preferred examples of the present invention, and are not intended to be taken as the full scope of the present invention, and any obvious modifications or simple changes based on the locking type elastic cone locknut of the present invention are within the scope of the patent coverage of the present invention.

Claims

1. Locking formula elasticity circular cone locknut, its characterized in that: the locknut consists of a thick nut with an inner conical hole and a thin nut with an outer conical boss, an arc-shaped cross section groove is formed on the circumference of the hole wall at the bottom of the inner conical hole of the thick nut, and an arc-shaped cross section bulge is formed on the circumference of the top of the conical surface of the outer conical boss of the thin nut; by screwing the thin nut with the outer conical boss, the outer conical boss is extruded with the hole wall of the inner conical hole to generate deformation in the screwing process until the arc-shaped section protrusion on the outer conical boss enters the arc-shaped section groove on the hole wall at the bottom of the inner conical hole, so that the bolt thread and the nut thread are further locked in the axial direction to form locking.

2. A locking elastic cone locknut as defined in claim 1, wherein: the thick nut with the inner conical hole is characterized in that a section of inner conical hole is processed at one end of a standard hexagonal nut, and an arc-shaped cross-section groove is drawn out around the hole wall at the bottom of the inner conical hole; the thin nut with the external conical boss is characterized in that a section of external conical boss is processed at one end of a standard hexagonal nut, and an arc-shaped section bulge is reserved on the top of a conical surface of the external conical boss in a circle; the taper sizes of the inner conical hole and the outer conical boss are matched, and the sizes of the arc-shaped section groove and the arc-shaped section bulge are matched; the outer cone boss is provided with four deformation grooves along the axial direction of the nut.

3. A locking elastic cone locknut as defined in claim 1, wherein: the small diameter of the conical hole of the thick nut with the inner conical hole is larger than the large diameter of the internal thread of the nut, and is 0.3mm-1mm smaller than the small diameter of the conical boss outside the thin nut; the big diameter size of the conical hole of the thick nut with the inner conical hole is equal to the big diameter size of the conical boss outside the thin nut; the small diameter of the outer conical boss of the thin nut with the outer conical boss is larger than the large diameter of the inner thread of the nut.

4. A locking elastic cone locknut as defined in claim 1, wherein: the taper of the outer cone boss cannot be too large, the included angle between the conical surface and the central axis is 5-10 degrees, and the normal elastic deformation of the outer cone boss of the thin nut is ensured.

5. A locking elastic cone locknut as defined in claim 1, wherein: in order to ensure that the thin nut with the outer conical boss is normally screwed in and out, the hole wall of the inner conical hole of the thick nut needs to be smooth, the sizes of the arc-shaped cross section groove on the hole wall at the bottom of the inner conical hole and the arc-shaped cross section bulge at the top of the conical surface of the outer conical boss cannot be too large, and the height of the arc-shaped cross section bulge at the top of the conical surface of the outer conical boss is 0.5mm-1 mm.

6. A locking elastic cone locknut as defined in claim 1, wherein: the width of the deformation groove on the outer cone boss is set to ensure that the deformation of each part of the outer cone boss is not interfered with each other, and the width of the deformation groove on the outer cone boss is 1-2 mm.