Stop screw assembly

Abstract

The lock screw assembly comprises a screw and a nut, the screw comprises a screw head and a screw body, the area of the screw head is larger than that of the screw body, triangular threads are arranged on the peripheral side of the screw body, trapezoidal threads or triangular threads are arranged on the peripheral side of the screw head, and the thread pitch of the screw head is larger than that of the screw body. The nut is in threaded connection with a screw head of the screw. According to the structural design, when the screw is to be loosened due to vibration, under the action of the nut and the threads with different screw pitches, an opposite axial acting force can be generated to prevent the screw from being loosened, so that a good anti-loosening effect is achieved, and the anti-loosening screw is very suitable for use occasions with high requirements for anti-loosening performance; the screw and the nut need to be clamped by an internal hexagonal wrench and an external hexagonal wrench respectively, force in opposite directions is applied to separate the nut from the screw, and then the screw is taken out, so that the screw has a detachable function and is convenient to reuse.

Description

Technical Field

[0001] The present invention relates to the technical field of screws, and in particular to an anti-loosening screw assembly. Background Art

[0002] In various fields, there are many occasions where screws need to be used for tightening and preventing loosening. However, general screws are likely to loosen when subjected to strong vibration. Loose screws may affect the service life of the machine, mechanical safety and personal safety. Therefore, anti-loosening screws are needed for tightening in the above occasions. The anti-loosening methods used by anti-loosening screws in the existing technology mainly include friction anti-loosening and permanent anti-loosening. Among them, friction anti-loosening uses anti-slip pads to prevent loosening. However, the anti-loosening effect of this anti-loosening method is not very ideal and cannot be adapted to occasions with high requirements for anti-loosening performance; permanent anti-loosening uses spot welding, riveting, bonding and other methods to prevent loosening. Although this anti-loosening method has a good anti-loosening effect, the screws will often be destroyed during disassembly, making the screws unable to be reused. Summary of the Invention

[0003] The purpose of the present invention is to overcome the deficiencies of the prior art and to provide a reusable anti-loosening screw assembly which has a better anti-loosening effect and is easy to disassemble.

[0004] The technical solutions of the present invention are as follows:

[0005] A screw locking assembly comprises a screw and a nut, wherein the screw comprises a screw head and a screw body, the area of the screw head is larger than the area of the screw body, a triangular thread is provided on the circumference of the screw body, a trapezoidal thread or a triangular thread is provided on the circumference of the screw head, and the thread pitch of the screw head is larger than the thread pitch of the screw body, and the nut is threadedly connected to the screw head of the screw.

[0006] Furthermore, the screw head of the screw is a hexagonal head, and the nut is a hexagonal nut.

[0007] Furthermore, the threads on the peripheral side of the screw head of the screw are subjected to a smooth surface treatment.

[0008] Furthermore, the bottom surface of the nut is provided with a plurality of upper locking teeth evenly distributed around the circumference.

[0009] Furthermore, the plurality of upper locking teeth are concentrically and obliquely arranged.

[0010] Furthermore, the anti-loosening screw assembly also includes a washer, which is sleeved on the screw body of the screw and conflicts with the nut.

[0011] Furthermore, a plurality of lower locking teeth matching the upper locking teeth are evenly distributed on the top surface of the washer in a circumferential manner.

[0012] Furthermore, the washer is provided with a mounting groove adapted to the nut, and the peripheral side of the mounting groove is provided with a positioning edge that abuts against the side wall of the nut.

[0013] Compared with the prior art, the beneficial effect of the present invention is that: the present invention includes a screw and a nut, wherein the screw head of the screw is provided with a trapezoidal thread or a triangular thread on the circumferential side, and the nut is threadedly connected to the screw head of the screw. Through this structural design, when the screw wants to be loosened due to vibration, under the action of the nut and the threads of different pitches, and the smooth contact surface between the screw and the nut, an opposite axial force will be generated to prevent the screw from loosening, thereby achieving a good anti-loosening effect, which is very suitable for use in occasions with high requirements for anti-loosening performance. When the screw needs to be removed, it is necessary to use an inner hexagonal wrench and an outer hexagonal wrench to clamp the screw and the nut respectively and apply forces in opposite directions to separate the nut from the screw, and then take out the screw, so that the screw has a detachable function and is easy to reuse. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0015] Figure 1 A schematic structural diagram of an anti-loosening screw assembly provided in Example 1 of the present invention;

[0016] Figure 2 A structural cross-sectional view of a locking screw assembly provided in Example 1 of the present invention;

[0017] Figure 3 A schematic structural diagram of an anti-loosening screw assembly provided in Example 2 of the present invention;

[0018] Figure 4 A structural cross-sectional view of a locking screw assembly provided in Example 2 of the present invention;

[0019] Figure 5 A schematic structural diagram of an anti-loosening screw assembly provided in Example 3 of the present invention;

[0020] Figure 6 A structural cross-sectional view of a locking screw assembly provided in Example 3 of the present invention;

[0021] Figure 7 A schematic structural diagram of a locking screw assembly provided in Example 4 of the present invention;

[0022] Figure 8This is a structural cross-sectional view of an anti-loosening screw assembly provided in Example 4 of the present invention. DETAILED DESCRIPTION

[0023] In order to make the purpose, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0024] In order to illustrate the technical solution of the present invention, specific embodiments are provided below.

[0025] Example 1

[0026] See also Figure 1 、 Figure 2 The present embodiment provides an anti-loosening screw assembly, comprising a screw 1 and a nut 2. The screw 1 comprises a screw head 11 and a screw body 12. The area of the screw head 11 is larger than that of the screw body 12. The circumference of the screw body 12 is provided with a triangular thread, the circumference of the screw head 11 is provided with a trapezoidal thread, and the thread pitch of the screw head 11 is larger than the thread pitch of the screw body 12. The nut 2 is threadedly connected to the screw head 11 of the screw 1, and the circumferential thread of the screw head 11 of the screw 1 is subjected to a smooth surface treatment. With this structural design, when the screw 1 is about to be loosened due to vibration, under the action of the nut 2 and the threads of different pitches, and the smooth contact surface between the screw 1 and the nut 2, an opposite axial force is generated to prevent the screw 1 from loosening, thereby achieving a good anti-loosening effect. It is very suitable for use in occasions with high requirements for anti-loosening performance.

[0027] In this embodiment, the screw head 11 of the screw 1 is a hexagonal head, and the nut 2 is a hexagonal nut. When the screw 1 needs to be removed, it is necessary to use an internal hexagonal wrench and an external hexagonal wrench to clamp the screw 1 and nut 2 respectively and apply force in opposite directions to separate the nut 2 from the screw 1. Then, the screw 1 is removed, making the screw 1 removable and easy to reuse.

[0028] Preferably, the bottom surface of the nut 2 is evenly distributed with a plurality of upper locking teeth 21 on the circumference, and the plurality of upper locking teeth 21 are concentrically inclined. Through the action of the upper locking teeth 21, the locking force of the nut 2 can be further improved.

[0029] Example 2

[0030] See also Figure 3 、 Figure 4, this embodiment provides an anti-loosening screw assembly, including a screw 1, a nut 2 and a washer 3, the screw 1 includes a screw head 11 and a screw body 12, the area of the screw head 11 is larger than the area of the screw body 12, the circumferential side of the screw body 12 is provided with a triangular thread, the circumferential side of the screw head 11 is provided with a trapezoidal thread, and the thread pitch of the screw head 11 is larger than the thread pitch of the screw body 12, the nut 2 is threadedly connected to the screw head 11 of the screw 1, and the circumferential side thread of the screw head 11 of the screw 1 is smoothed. The washer 3 is sleeved on the screw body 12 of the screw 1 and conflicts with the nut 2. The bottom surface of the nut 2 is circumferentially evenly distributed with a plurality of upper locking teeth 21, and the plurality of upper locking teeth 21 are concentrically inclined. The top surface of the washer 3 is circumferentially evenly distributed with a plurality of lower locking teeth 31 that match the upper locking teeth 21. With this structural design, when the screw 1 is about to loosen due to vibration, the action of the nut 2 and the threads of different pitches, coupled with the smooth contact surface between the screw 1 and the nut 2, will generate an opposite axial force to prevent the screw 1 from loosening, thereby achieving a good anti-loosening effect. It is very suitable for use in situations where high anti-loosening performance is required and washers are needed.

[0031] In this embodiment, the screw head 11 of the screw 1 is a hexagonal head, and the nut 2 is a hexagonal nut. When the screw 1 needs to be removed, it is necessary to use an internal hexagonal wrench and an external hexagonal wrench to clamp the screw 1 and nut 2 respectively and apply force in opposite directions to separate the nut 2 from the screw 1. Then, the screw 1 is removed, making the screw 1 removable and easy to reuse.

[0032] In this embodiment, the washer 3 is provided with a mounting groove adapted to the nut 2 , and a positioning edge 32 is provided around the mounting groove to abut against the side wall of the nut 2 .

[0033] Example 3

[0034] See also Figure 5 、 Figure 6 The present embodiment provides an anti-loosening screw assembly, comprising a screw 1 and a nut 2. The screw 1 comprises a screw head 11 and a screw body 12. The area of the screw head 11 is larger than that of the screw body 12. The circumference of the screw body 12 is provided with a triangular thread. The circumference of the screw head 11 is provided with a triangular thread, and the thread pitch of the screw head 11 is larger than the thread pitch of the screw body 12. The nut 2 is threadedly connected to the screw head 11 of the screw 1, and the circumferential thread of the screw head 11 of the screw 1 is subjected to a smooth surface treatment. With this structural design, when the screw 1 is about to loosen due to vibration, under the action of the nut 2 and the threads of different pitches, and the smooth contact surface between the screw 1 and the nut 2, an opposite axial force is generated to prevent the screw 1 from loosening, thereby achieving a good anti-loosening effect. It is very suitable for use in applications with high requirements for anti-loosening performance.

[0035] In this embodiment, the screw head 11 of the screw 1 is a hexagonal head, and the nut 2 is a hexagonal nut. When the screw 1 needs to be removed, it is necessary to use an internal hexagonal wrench and an external hexagonal wrench to clamp the screw 1 and nut 2 respectively and apply force in opposite directions to separate the nut 2 from the screw 1. Then, the screw 1 is removed, making the screw 1 removable and easy to reuse.

[0036] Preferably, the bottom surface of the nut 2 is evenly distributed with a plurality of upper locking teeth 21 on the circumference, and the plurality of upper locking teeth 21 are concentrically inclined. Through the action of the upper locking teeth 21, the locking force of the nut 2 can be further improved.

[0037] Example 4

[0038] See also Figure 7 、 Figure 8 , this embodiment provides an anti-loosening screw assembly, including a screw 1, a nut 2 and a washer 3, the screw 1 includes a screw head 11 and a screw body 12, the area of the screw head 11 is larger than the area of the screw body 12, the circumferential side of the screw body 12 is provided with a triangular thread, the circumferential side of the screw head 11 is provided with a triangular thread, and the thread pitch of the screw head 11 is larger than the thread pitch of the screw body 12, the nut 2 is threadedly connected to the screw head 11 of the screw 1, and the circumferential side thread of the screw head 11 of the screw 1 is smoothed. The washer 3 is sleeved on the screw body 12 of the screw 1 and conflicts with the nut 2. The bottom surface of the nut 2 is circumferentially evenly distributed with a plurality of upper locking teeth 21, and the plurality of upper locking teeth 21 are concentrically inclined. The top surface of the washer 3 is circumferentially evenly distributed with a plurality of lower locking teeth 31 that match the upper locking teeth 21. With this structural design, when the screw 1 is about to loosen due to vibration, the action of the nut 2 and the threads of different pitches, coupled with the smooth contact surface between the screw 1 and the nut 2, will generate an opposite axial force to prevent the screw 1 from loosening, thereby achieving a good anti-loosening effect. It is very suitable for use in situations where high anti-loosening performance is required and washers are needed.

[0039] In this embodiment, the screw head 11 of the screw 1 is a hexagonal head, and the nut 2 is a hexagonal nut. When the screw 1 needs to be removed, it is necessary to use an internal hexagonal wrench and an external hexagonal wrench to clamp the screw 1 and nut 2 respectively and apply force in opposite directions to separate the nut 2 from the screw 1. Then, the screw 1 is removed, making the screw 1 removable and easy to reuse.

[0040] In this embodiment, the washer 3 is provided with a mounting groove adapted to the nut 2 , and a positioning edge 32 is provided around the mounting groove to abut against the side wall of the nut 2 .

[0041] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A screw assembly comprising a screw and a nut, characterized in that: The screw includes a screw head and a screw body, the area of the screw head is larger than the area of the screw body, the circumference of the screw body is provided with a triangular thread, the circumference of the screw head is provided with a trapezoidal thread or a triangular thread, and the thread pitch of the screw head is larger than the thread pitch of the screw body, and the nut is threadedly connected to the screw head of the screw.

2. The anti-loosening screw assembly according to claim 1, characterized in that: The screw head of the screw is a hexagonal head, and the nut is a hexagonal nut.

3. The anti-loosening screw assembly according to claim 1, characterized in that: The threads on the peripheral side of the screw head of the screw are subjected to smooth surface treatment.

4. The anti-loosening screw assembly according to claim 1, characterized in that: The bottom surface of the nut is evenly distributed with a plurality of upper locking teeth in a circumferential manner.

5. The anti-loosening screw assembly according to claim 4, characterized in that: The plurality of upper locking teeth are concentrically and obliquely arranged.

6. The anti-loosening screw assembly according to claim 4, characterized in that: The anti-loosening screw assembly further comprises a washer, which is sleeved on the screw body and contacts the nut.

7. The anti-loosening screw assembly according to claim 6, characterized in that: The top surface of the washer is evenly distributed circumferentially with a plurality of lower locking teeth that match the upper locking teeth.

8. The anti-loosening screw assembly according to claim 6, characterized in that: The washer is provided with a mounting groove adapted to the nut, and a circumferential side of the mounting groove is provided with a positioning edge that abuts against the side wall of the nut.

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