Unloading necking lock nut

Abstract

A force-unloading necking lock nut belongs to the technical field of fasteners and is characterized in that a cylindrical ring is arranged on a nut body, and one or more groups of necking points and force-unloading grooves are arranged on the ring wall of the cylindrical ring; the necking point is arranged on the inner thread wall of the cylindrical ring, and the locking inner diameter starting from the necking point through the circle center is smaller than the inner diameter of the nut. The force unloading groove is formed in the outer side wall of the cylindrical ring and located in the back side position of the necking point. The screw has the advantages that the screw can be locked through the necking point, the ring wall of the cylindrical ring can be thinned through the force unloading groove, contact points of threads of the necking point and threads of the screw are dispersed, the contact face of the necking point and the screw is increased, point-line contact is changed into line-face contact, when the screw is screwed in, the screw is screwed in with the same twisting force, and due to the increase of the contact face, the screw can be screwed out with the same twisting force. The number of stress points of the tooth tip of the screw is increased, and the pressure of a single stress point is reduced, so that the threads can be prevented from being sprained, the locking effect can be improved, and the anti-loosening performance of the nut on the screw is effectively improved.

Description

Technical Field

[0001] The utility model belongs to the technical field of fasteners, in particular to a force-releasing shrinking anti-loosening nut. Background Art

[0002] Commonly used fasteners include bolt-nut assemblies, stud-nut assemblies, screws, etc., in which the nut is a polygonal cylinder with a central threaded hole. The inner ring wall of the central threaded hole is provided with an internal thread, which is tightened with the external thread on the stud to fasten and connect two or more fasteners with through holes.

[0003] The tightening of nuts and bolts is generally relatively stable. However, if the fasteners are in vibration for a long time, there will be a difference in vibration frequency between the connecting parts, which will cause a certain displacement of the connecting parts in the connection structure, causing the connection between the nuts and bolts to become loose or even fall off, thereby affecting the stability and safety of the connection structure and even the operation of the entire device. Take the fastening screws and nuts on the train tracks as an example. When the train passes through the track at a certain speed, the fastening screws and nuts on the track will vibrate at a certain frequency, which may cause the fastening screws and nuts to be displaced to a certain extent, resulting in loose connections. Therefore, on the old-fashioned train tracks, maintenance personnel often need to perform regular inspections.

[0004] To this end, the applicant has previously developed an elliptical hoop type anti-loosening nut, which adds an elliptical hoop on the basis of the existing nut, and the short diameter and long diameter of the inner ellipse formed by the inner ring wall of the elliptical hoop are respectively called the inner short diameter and the inner long diameter, and the inner short diameter of the elliptical hoop is equal to 90.0%-99.9% of the inner diameter of the nut. The elliptical hoop is directly fixed to the nut through a direct connection part. Since the inner short diameter of the elliptical hoop is smaller than the inner diameter of the nut, the elliptical hoop can hold the screw tightly when tightened on the screw, which can effectively prevent the nut from loosening; but in actual use, the short diameter position can easily cause the screw thread to deform and damage the screw while strongly holding the screw. Utility Model Content

[0005] The technical problem to be solved by the utility model is to provide a nut with a deformable force-relieving shrinking groove on the added cylindrical ring in view of the above-mentioned defects, so that when the screw is tightened and clamped, the force-relieving groove can make the wall of the cylindrical ring thinner, and unload part of the pressure at the point where the shrinking point thread contacts the screw thread with the greatest pressure, and disperse it to the side of the maximum pressure point, so that the contact surface between the shrinking point position and the screw is increased, and the contact of a point line is changed into the contact of a line surface. When the screw is screwed in, the same torque is screwed in, and due to the increase in the contact surface, the force points on the screw tooth tip increase, and the pressure of a single force point will be reduced, which can not only prevent the external thread on the screw from being twisted, but also increase the friction area and improve the locking effect, effectively improve the anti-loosening performance of the nut on the screw, and avoid damage to the screw.

[0006] In order to solve the above technical problems, the technical solution adopted by the utility model is a force-releasing shrinking anti-loosening nut, comprising a nut body, one side of the nut body is directly connected with a cylindrical ring, the cylindrical ring is provided with an internal thread, and the internal thread is of the same specification as the internal thread on the nut body; one or more groups of shrinking points and force-releasing grooves are provided on the circle wall of the cylindrical ring, the shrinking point is an inwardly protruding vertical compression strip arranged on the internal thread wall of the cylindrical ring, and the distance from the shrinking point through the center of the cylindrical ring where it is located to the opposite side wall is called the locking inner diameter, and the locking inner diameter is smaller than the nut inner diameter; in this way, the nut can be The female locking screw does not loosen; the locking inner diameter is generally made equal to 90%-99.9% of the inner diameter of the nut; the unloading groove is a vertical groove arranged on the outer wall of the cylindrical ring and located on the back side of the shrinkage point; in this way, the wall of the cylindrical ring can be thinned, and when the nut is tightened on the screw, the thread of the screw will open the shrinkage point on the cylindrical ring by the torque of the screw rotation, and the contact position of the locking screw at the shrinkage point will change from a point contact to a line surface, so that its locking contact surface is increased, so that it will avoid damaging the external thread on the screw on the basis of achieving the anti-loosening effect, and achieve a good anti-loosening effect.

[0007] Furthermore, the unloading groove is an arc-shaped groove, and the low point of the arc-shaped groove is aligned with the shrinkage point, so that the cylindrical wall at the shrinkage point where the locking pressure is the largest is the thinnest, and the point where the maximum force is applied becomes elastic, so that the parts on both sides of the point where the nut thread is subjected to the greatest force also play a clamping role together. The highest point of each position of the shrinkage of the nut thread is subjected to force, which becomes a linear surface force, effectively avoiding the phenomenon of damaging the thread after the nut and the screw are screwed in, and increasing the locking contact surface, which can effectively improve the anti-loosening performance of the nut.

[0008] Generally, the shrinkage points and the stress-relieving grooves on the cylindrical ring are arranged in two, three or four groups and are evenly distributed on the cylindrical ring.

[0009] The outer ring wall of the cylindrical ring is a conical wall, that is, the outer diameter of the bottom of the outer ring wall is greater than the outer diameter of the top of the outer ring wall, and the inner ring wall of the cylindrical ring is a cylindrical wall, that is, the inner diameter of any position of the inner ring wall is the same.

[0010] A conical chamfer is provided between the nut body and the cylindrical ring, the top outer diameter of the chamfer is equal to the outer diameter of the conical ring, and preferably the bottom outer diameter of the chamfer is equal to the minimum outer diameter of the nut body; the unloading groove passes through the chamfer; the minimum outer diameter of the nut body refers to the distance between two corresponding side surfaces of the six outer side surfaces in the hexagonal nut, and the maximum outer diameter of the nut body refers to the distance between two corresponding outer angles of the six outer angles in the hexagonal nut.

[0011] A flange is directly formed on the other side of the nut body.

[0012] The beneficial effect of the utility model is that a cylindrical ring is arranged on the nut body, and a shrinkage point and a force unloading groove are arranged on the cylindrical ring. The shrinkage point can lock the screw, and the force unloading groove can make the circle wall of the cylindrical ring thinner, thereby increasing the contact area between the shrinkage point and the screw. In this way, the external thread on the screw can be prevented from being scratched on the screw tip due to the shrinkage inner diameter of the nut, the screwing pressure is increased, and the protective coating of the thread is damaged. The friction area can also be increased to improve the locking effect, thereby effectively improving the anti-loosening performance of the nut. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is a schematic diagram of the overall structure of the force-releasing shrinking anti-loosening nut of the utility model.

[0014] Figure 2 The utility model is a structural schematic diagram of a flange plate generated on the other side of the force-releasing shrinking anti-loosening nut.

[0015] In the figure: 1. Nut body, 2. Cylindrical ring, 3. Internal thread, 4. Narrowing point, 5. Unloading groove, 6. Locking inner diameter, 7. Chamfer, 8. Flange. DETAILED DESCRIPTION

[0016] The utility model is further described below in conjunction with the embodiments.

[0017] like Figure 1 As shown, a force-relieving shrinking anti-loosening nut is made, that is, on the basis of the existing nut, a cylindrical ring 2 is directly generated and connected to one side of the nut body 1, the wall thickness of the cylindrical ring 2 is less than the minimum thickness of the nut body wall, and an internal thread 3 is arranged in the cylindrical ring 2, and the internal thread 3 has the same specification as the internal thread on the nut body 1; in this embodiment, three groups of shrinking points 4 and force-releasing grooves 5 are evenly distributed on the wall of the cylindrical ring 2, and two or four groups can also be arranged; the shrinking point 4 is a vertical compression strip protruding inwardly arranged on the internal thread wall of the cylindrical ring 2, and ... The displayed state is in a plane shape; it is defined here that: the distance from the shrinkage point 4 through the center of the cylindrical ring 2 where it is located to the opposite side wall is called the locking inner diameter 6, and the locking inner diameter 6 is smaller than the inner diameter of the nut; generally, the locking inner diameter 6 is made equal to 90%-99.9% of the inner diameter of the nut; in this embodiment, the locking inner diameter 6 is made equal to 96.0% of the inner diameter of the nut; the unloading groove 5 is a vertical groove arranged on the outer wall of the cylindrical ring 2 and located on the back side of the shrinkage point 4; the unloading groove 5 in this embodiment is an arc-shaped groove, and the low point of the arc-shaped groove is aligned with the shrinkage point 4, so that it is made like this Figure 1 The load-relieving, reduced-mouth locknut shown.

[0018] Furthermore, a chamfer 7 for transition is provided between the nut body 1 and the cylindrical ring 2 , the bottom outer diameter of the chamfer 7 is equal to the minimum outer diameter of the nut body, and the top outer diameter of the chamfer 7 is equal to the outer diameter of the conical ring; the unloading groove 5 passes through the chamfer 7 .

[0019] Furthermore, the outer ring wall of the cylindrical ring 2 is a conical wall, and the inner ring wall is a cylindrical wall; a flange 8 is directly formed on the other side of the nut body 1.

[0020] When in use, use a wrench to tighten the force-relieving shrinkage anti-loosening nut on the screw. Due to the provision of the cylindrical ring 2 and its shrinkage point 4 and the force-releasing groove 5, the cylindrical ring wall at the shrinkage point 4 where the locking pressure is the largest is the thinnest. The point at which the nut thread is subjected to the greatest force will, due to the elastic force, allow the parts on both sides of the point at which the nut thread is subjected to the greatest force to also play a clamping role, so that the line point force at the shrinkage point 4 of the nut thread is transformed into a line surface force, effectively increasing the locking contact surface. This not only increases the locking contact friction surface and improves the anti-loosening effect, but also avoids damage to the thread when the nut and the screw are tightened.

Claims

1. A force-releasing shrinking anti-loosening nut, comprising a nut body (1), characterized in that A cylindrical ring (2) is directly connected to one side of the nut body (1), and an internal thread (3) is provided inside the cylindrical ring (2), and the internal thread (3) has the same specification as the internal thread on the nut body (1); one or more groups of shrinkage points (4) and unloading grooves (5) are provided on the wall of the cylindrical ring (2); the shrinkage point (4) is an inwardly protruding vertical compression strip arranged on the wall of the internal thread (3) of the cylindrical ring (2), and the distance from the shrinkage point (4) through the center of the cylindrical ring (2) to the opposite side wall is called the locking inner diameter (6), and the locking inner diameter (6) is smaller than the inner diameter of the nut; the unloading groove (5) is a vertical groove arranged on the outer wall of the cylindrical ring (2) and located on the back side of the shrinkage point (4).

2. The force-releasing shrinking anti-loosening nut according to claim 1, characterized in that The locking inner diameter (6) is 90%-99.9% of the inner diameter of the nut.

3. The force-releasing shrinking anti-loosening nut according to claim 2, characterized in that The unloading groove (5) is an arc-shaped groove, and the low point of the arc-shaped groove is aligned with the shrinkage point (4).

4. The force-releasing shrinking anti-loosening nut according to claim 3, characterized in that The shrinkage points (4) and the stress-relieving grooves (5) on the cylindrical ring (2) are arranged in two, three or four groups and are evenly distributed on the cylindrical ring (2).

5. The force-releasing shrinking anti-loosening nut according to claim 4, characterized in that The outer ring wall of the cylindrical ring (2) is a conical wall.

6. The force-releasing shrinking anti-loosening nut according to claim 5, characterized in that A conical chamfer (7) is provided between the nut body (1) and the cylindrical ring (2).

7. The force-releasing shrinking anti-loosening nut according to claim 6, characterized in that The stress-relieving groove (5) passes through the chamfer (7).

8. The force-releasing shrinking anti-loosening nut according to claim 7, characterized in that A flange (8) is directly formed on the other side of the nut body (1).

Images