Self-tapping locking screw with anti-loosening teeth

Abstract

The utility model discloses an anti-loose tooth self-tapping locking screw which comprises a screw body and an outer tooth locking washer, the screw body is composed of a screw rod and a nut which are integrally formed, the screw rod is a half-thread stud, a thread gap is reserved at the position close to the nut, the outer tooth locking washer is arranged at the thread gap, and a gap is reserved between the nut and the outer tooth locking washer. A cross-shaped groove is formed in the upper surface of the nut, and a half-embossed tooth groove is formed in the bottom face of the nut. An R angle is arranged at the joint of the nut and the screw. Friction force is increased through mutual meshing and locking of the half-knurling tooth grooves in the bottom face of the nut and the outer tooth locking gasket, and the half-knurling tooth grooves can properly enlarge the gap between the half-knurling tooth grooves and the outer tooth locking gasket so that the half-knurling tooth grooves can not be clamped. The inner ring of the nut is not provided with knurling teeth, the height of the R angle can be increased, cross groove deep breakdown is prevented, and damage torsion is increased.

Description

Technical Field

[0001] The utility model relates to a grounding screw, in particular to a self-tapping locking screw with anti-loosening teeth. Background Art

[0002] The cross recessed round head anti-loosening tooth self-tapping locking screws currently produced by the company are a combination of ordinary embossed teeth and external tooth locking washers. The anti-loosening effect is achieved by relying on the embossed teeth under the nut and the external teeth of the washer to engage and lock with each other to increase friction, which can prevent the screws from loosening during vibration. They are often used as grounding screws for air-conditioning outer boxes. During the assembly process of the user's production line, it was found that the root of the nut was broken, and it needed to be improved. Utility Model Content

[0003] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0004] A self-tapping locking screw with anti-loosening teeth comprises a screw body and an external tooth locking washer, characterized in that the screw body is composed of an integrally formed screw rod and a nut, the screw rod is a semi-threaded stud, a thread gap is left near the nut, the external tooth locking washer is arranged at the thread gap, and a gap is left between the nut and the external tooth locking washer; a cross groove is formed on the upper surface of the nut, and a semi-embossed tooth groove is formed on the bottom surface; an R angle is set at the connection between the nut and the screw rod.

[0005] As a further solution of the present invention, the diameter of the nut is 8.9 mm to 9.4 mm, and the height is 2.35 mm to 2.65 mm.

[0006] As a further solution of the utility model, the R angle under the nut is set to be 0.30-0.50mm.

[0007] As a further solution of the utility model, the semi-embossed tooth grooves are divided into eighteen equal parts, and the groove depth is 0.2-0.3 mm.

[0008] As a further solution of the utility model, the length of the screw is 7.2-8.8 mm, and the bottom outer diameter of the toothless polished rod is 3.48 mm.

[0009] As a further solution of the utility model, the outer diameter of the thread is 3.85-3.95 mm, and the pitch is 0.7 mm.

[0010] As a further solution of the utility model, the distance between the external tooth locking washer and the bottom of the nut is less than 0.7 mm.

[0011] As a further solution of the utility model, the end of the screw is rounded and the fillet diameter is 2.2 mm.

[0012] As a further solution of the utility model, the screw body and the external tooth locking washer are both electroplated.

[0013] The beneficial effects of the utility model are:

[0014] 1. The friction is increased by the mutual engagement and locking of the semi-embossed tooth groove on the bottom surface of the nut and the external tooth lock washer. The semi-embossed tooth groove can appropriately increase the gap with the external tooth lock washer without getting stuck.

[0015] 2. The lack of embossed teeth on the inner ring of the nut can increase the R angle height, prevent deep penetration of the cross groove, and increase the destructive torque. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a front view of the utility model;

[0017] Figure 2 It is a bottom view of the utility model;

[0018] Figure 3 It is a top view of the utility model;

[0019] Figure 4 It is a structural schematic diagram of the semi-embossed tooth groove on the bottom surface of the nut of the utility model. DETAILED DESCRIPTION

[0020] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the accompanying drawings in the embodiments of the present invention.

[0021] Reference Figure 1-Figure 4 The utility model provides an embodiment of a self-tapping locking screw with anti-loosening teeth, comprising a screw body 1 and an external tooth locking washer 2, characterized in that the screw body 1 is composed of an integrally formed screw rod 3 and a nut 4, the screw rod 3 is a semi-threaded stud, and a thread gap is left near the nut 4, the external tooth locking washer 2 is arranged at the thread gap, and a gap is left between the nut 4 and the external tooth locking washer 2; a cross groove 5 is formed on the upper surface of the nut 4, and a semi-embossed tooth groove 6 is formed on the bottom surface; an R angle is set at the connection between the nut 4 and the screw 3.

[0022] Among them, the diameter of the nut is 8.9mm~9.4mm, and the height is 2.35mm~2.65mm.

[0023] The R angle under the nut is set to be 0.30-0.5 mm.

[0024] Among them, the semi-embossed tooth grooves are divided into eighteen equal parts, and the groove depth is 0.2-0.3mm.

[0025] Among them, the screw length is 7.2~8.8mm, and the bottom outer diameter of the toothless rod size is 3.48mm.

[0026] Among them, the outer diameter of the thread is 3.85-3.95mm and the pitch is 0.7mm.

[0027] Among them, the distance from the external tooth locking washer to the bottom of the nut is <0.7mm.

[0028] The end of the screw is rounded and has a fillet diameter of 2.2 mm.

[0029] Among them, the screw body and the external tooth locking washer are both electroplated.

[0030] The torsion resistance test of the products is ≥3.4N.mm. After assembly with a 1.2Nm torque screwdriver, the products were tightened and loosened 5 times repeatedly without any breakage or slipping.

[0031] The above is only a preferred specific implementation of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes within the technical scope disclosed by the present invention according to the technical solution and the utility model concept of the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A self-tapping locking screw with anti-loosening teeth, comprising a screw body and an external tooth locking washer, It is characterized in that The screw body is composed of an integrally formed screw and nut. The screw is a semi-threaded stud with a thread gap near the nut. The external tooth locking washer is arranged at the thread gap, and a gap is left between the nut and the external tooth locking washer. A cross groove is formed on the upper surface of the nut, and a semi-embossed tooth groove is formed on the bottom surface. An R angle is set at the connection between the screw and the nut.

2. The anti-loosening tooth self-tapping locking screw according to claim 1, It is characterized in that The diameter of the nut is 8.9 mm to 9.4 mm, and the height is 2.35 mm to 2.65 mm.

3. The anti-loosening tooth self-tapping locking screw according to claim 1, It is characterized in that The R angle under the nut is set to be 0.30-0.50mm.

4. The anti-loosening tooth self-tapping locking screw according to claim 1, It is characterized in that The semi-embossed tooth grooves are divided into eighteen equal parts, and the groove depth is 0.2-0.3 mm.

5. The anti-loosening tooth self-tapping locking screw according to claim 1, It is characterized in that The length of the screw is 7.2-8.8 mm, and the bottom outer diameter of the toothless polished rod is 3.48 mm.

6. The anti-loosening tooth self-tapping locking screw according to claim 1, It is characterized in that The outer diameter of the thread is 3.85-3.95 mm, and the pitch is 0.7 mm.

7. The anti-loosening tooth self-tapping locking screw according to claim 1, It is characterized in that The distance between the external tooth locking washer and the bottom of the nut is less than 0.7 mm.

8. The anti-loosening tooth self-tapping locking screw according to claim 1, It is characterized in that The end of the screw is rounded, and the rounded corner diameter is 2.2 mm.

9. The anti-loosening tooth self-tapping locking screw according to claim 1, It is characterized in that The screw body and the external tooth locking washer are both electroplated.

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