Screw retaining mechanism

Abstract

The utility model discloses a screw retaining mechanism which comprises a main screw and a retaining screw. The main screw and the retaining screw are connected to a target body in a screwed mode. The main screw is parallel to the axis of the retaining screw, and the retaining screw is located on one side of the main screw. A first conical surface is arranged at the top of the screw head of the main screw in the circumferential direction, a second conical surface is arranged at the bottom of the screw head of the retaining screw in the circumferential direction, and the first conical surface and the second conical surface are opposite in direction; the main screw and the retaining screw are tightened in sequence, and the second conical surface abuts against and presses the first conical surface from the outer side. According to the embodiment of the utility model, the backstop screw is arranged to extrude the main screw, and the second conical surface at the bottom of the screw head of the backstop screw is utilized to compress the first conical surface at the top of the screw head of the main screw, so that when the main screw is loosened, a screwing torque opposite to the loosening direction can be applied to the backstop screw; the extrusion force of the backstop screw on the main screw can be further increased, the main screw is limited by the backstop screw in the axial direction, and the effect of preventing looseness and backstop of the main screw is achieved.

Description

Technical Field

[0001] This utility model relates to the field of mechanical fastener technology, and in particular to a screw anti-retraction mechanism. Background Technology

[0002] Screws are common fasteners in mechanical connections, used to fix parts to the machine body. They work through threaded engagement to form a detachable connection system. In use, the screw is screwed into the threaded hole on the body, and torque is applied to generate preload, ensuring a tight fit between the connected parts and preventing separation due to loosening or vibration.

[0003] In current mechanical design and manufacturing processes, threaded parts with small diameter and length-to-diameter ratios and small structural space are often required (such as screws with diameters between M3 and M6 and length-to-diameter ratios ≤1). However, these short threaded parts are relatively easy to loosen, and common methods such as double-nut anti-loosening or thread adhesive fastening are not very suitable. Therefore, it is necessary to design a thread anti-loosening and anti-retraction mechanism suitable for threaded parts in confined spaces and with small dimensions. Utility Model Content

[0004] In view of this, the present invention provides a screw anti-loosening mechanism to solve the problem of the lack of an anti-loosening mechanism suitable for short screws in the prior art.

[0005] To achieve one or more of the above objectives or other objectives, this utility model proposes: a screw anti-retraction mechanism, comprising: a main screw and an anti-retraction screw respectively screwed onto the target body;

[0006] The main screw is parallel to the axis of the anti-reverse screw, and the anti-reverse screw is located on one side of the main screw;

[0007] The top of the screw head of the main screw is provided with a first conical surface along its circumference, and the bottom of the screw head of the anti-reverse screw is provided with a second conical surface along its circumference, with the first conical surface and the second conical surface facing opposite directions;

[0008] The main screw and the anti-reverse screw are tightened in sequence, and the second conical surface abuts against and presses against the first conical surface from the outside.

[0009] Preferably, the first conical surface is parallel to the second conical surface.

[0010] Preferably, the angle between the first conical surface and the horizontal plane is 30-60°.

[0011] Preferably, the main screw and the anti-reverse screw have the same thread direction.

[0012] Preferably, multiple anti-reverse screws are provided, and the multiple anti-reverse screws are distributed circumferentially along the main screw.

[0013] Preferably, the length-to-diameter ratio of the anti-reverse screw is greater than that of the main screw.

[0014] Preferably, the length of the anti-reverse screw is greater than the length of the main screw.

[0015] Preferably, the diameter of the anti-reverse screw is smaller than the diameter of the main screw.

[0016] Preferably, the diameter of the head of the anti-reverse screw is smaller than the diameter of the head of the main screw.

[0017] Preferably, the outer end faces of the main screw and the anti-reverse screw are flush.

[0018] Implementing the embodiments of this utility model will have the following beneficial effects:

[0019] After adopting the above-mentioned screw anti-loosening mechanism, the anti-loosening screw compresses the main screw, and the second conical surface at the bottom of the anti-loosening screw head presses against the first conical surface at the top of the main screw head. When the main screw shows a tendency to loosen, the anti-loosening screw applies a tightening torque in the opposite direction of the loosening rotation of the main screw, which can further increase the compressive force of the anti-loosening screw on the main screw. The main screw is limited in the axial direction by the anti-loosening screw, thus achieving the effect of preventing the main screw from loosening and retracting. Attached Figure Description

[0020] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0021] in:

[0022] Figure 1 This is a schematic diagram of the installation of the screw anti-retraction mechanism proposed in this utility model;

[0023] Figure 2 This is a schematic cross-sectional view of the installation structure of the screw anti-retraction mechanism proposed in this utility model;

[0024] Figure 3 This is a front view of the screw anti-retraction mechanism proposed in this utility model;

[0025] Figure 4 This is a side view of the screw anti-retraction mechanism proposed in this utility model.

[0026] Reference numerals: 10, main screw; 11, first conical surface; 20, anti-reverse screw; 21, second conical surface; 30, target body. Detailed Implementation

[0027] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains; the terminology used herein in the specification is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention; the terms "comprising" and "having," and any variations thereof, in the specification, claims, and accompanying drawings of this invention are intended to cover non-exclusive inclusion. The terms "first," "second," etc., in the specification, claims, or accompanying drawings of this invention are used to distinguish different objects, not to describe a particular order.

[0028] In this document, the term "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of the present invention. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0029] To enable those skilled in the art to better understand the present invention, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings.

[0030] like Figure 1-4 The image shows an embodiment provided by this utility model.

[0031] This utility model embodiment provides a screw anti-reverse mechanism, including: a main screw 10 and an anti-reverse screw 20 respectively screwed onto a target body 30. The main screw 10 is a small screw with shallow threads. The target body 30 is usually a mechanical structure, machine or equipment that needs to be fixed with a small screw. The target body 30 is provided with internal threaded holes that are adapted to the main screw 10 and the anti-reverse screw 20 respectively. Specifically, the main screw 10 and the anti-loosening screw 20 are parallel to each other, and the anti-loosening screw 20 is located on one side of the main screw 10. The anti-loosening screw 20 is arranged adjacent to the main screw 10, occupying little space and suitable for narrow spaces. Both the main screw 10 and the anti-loosening screw 20 include a screw head and a screw shank. The top of the screw head of the main screw 10 is provided with a first conical surface 11 along its circumference, and the bottom of the screw head of the anti-loosening screw 20 is provided with a second conical surface 21 along its circumference. The first conical surface 11 and the second conical surface 21 face opposite directions. When it is necessary to tighten a specific part, the main screw 10 and the anti-loosening screw 20 are screwed into the corresponding internal threaded holes in sequence and tightened. The second conical surface 21 abuts against and presses against the first conical surface 11 from the outside of the screw head of the main screw 10, thereby preventing the main screw 10 from loosening.

[0032] Anti-loosening and anti-retraction principle: The second conical surface 21 of the anti-loosening screw 20 is tightly pressed against the first conical surface 11 of the main screw 10. The second conical surface 21 and the first conical surface 11 are opposite conical surfaces to each other. The threads of the main screw 10 and the anti-loosening screw 20 are in the same direction. For example, if both the main screw 10 and the anti-loosening screw 20 are tightened in a clockwise direction, the loosening torque of the main screw 10 and the anti-loosening screw 20 is in the counterclockwise direction. This is achieved through the squeezing and mutual friction between the second conical surface 21 of the anti-loosening screw 20 and the first conical surface 11 of the main screw 10. When the main screw 10 shows a tendency to loosen (i.e., the main screw 10 rotates counterclockwise), the first conical surface 11 will apply a clockwise frictional force to the second conical surface 21, thereby forming a clockwise torque on the anti-loosening screw 20. This torque is a tightening torque for the anti-loosening screw 20, which can tighten the anti-loosening screw 20, thereby further increasing the squeezing force of the second conical surface 21 on the first conical surface 11, so that the main screw 10 is limited in the axial direction by the anti-loosening screw 20, thereby achieving the effect of preventing the main screw 10 from loosening and preventing it from rolling back. Furthermore, since both the first conical surface 11 and the second conical surface 21 are inclined surfaces, when the main screw 10 shows a tendency to loosen, a portion of its outward force along the axial direction will be applied to the second conical surface 21 in a direction deviating from the axial direction through the first conical surface 11. The direction of the force on the second conical surface 21 is deviating from its axial direction relative to the anti-loosening screw 20. Therefore, when the main screw 10 is about to loosen, the anti-loosening screw 20 will be squeezed against the inner wall on the other side of the internal threaded hole where it is located, making it difficult for the anti-loosening screw 20 to come out along its axial direction. The anti-loosening screw 20, in turn, forms a further limiting effect on the main screw 10, preventing the main screw 10 from loosening further.

[0033] After adopting the above-mentioned screw anti-loosening mechanism, the main screw 10 is squeezed by the anti-loosening screw 20, and the second conical surface 21 at the bottom of the screw head of the anti-loosening screw 20 is pressed against the first conical surface 11 at the top of the screw head of the main screw 10. This can play a good role in preventing loosening and preventing the main screw 10 from being pulled back. Compared with the existing anti-loosening mechanism, it is more suitable for threaded parts in narrow spaces and small sizes.

[0034] In one embodiment, the first conical surface 11 and the second conical surface 21 are parallel, which allows them to fit more closely when in contact, increasing their contact area and improving mutual friction. This enables the main screw 10 to transmit the force more stably to the anti-slip screw 20 when it loosens, avoiding or reducing slippage. The angle between the first conical surface 11 and the second conical surface 21 and the horizontal plane is an acute angle, so that the interaction between the first conical surface 11 and the second conical surface 21 can change the direction of the force transmitted from the main screw 10 to the anti-slip screw 20. Preferably, the angle between the first conical surface 11 and the horizontal plane is 30-60°.

[0035] In one embodiment, multiple anti-retracting screws 20 are provided, and the multiple anti-retracting screws 20 are distributed around the main screw 10. The more anti-retracting screws 20 there are, the better the loosening and anti-retracting effect of the main screw 10. The specific number of anti-retracting screws 20 can be comprehensively considered based on actual fastening requirements, installation space, processing costs, etc.

[0036] In one embodiment, the length-to-diameter ratio of the anti-loosening screw 20 is greater than that of the main screw 10. The length-to-diameter ratio of a screw refers to the ratio of the screw's length to its diameter. Since the main screw 10 needs to meet numerous requirements, its structure (such as diameter and length) is subject to many limitations. Therefore, there is a need to use an anti-loosening mechanism for anti-loosening and anti-retraction. The anti-loosening screw 20 has a single function: the stronger the connection, the better. Therefore, the length-to-diameter ratio of the anti-loosening screw 20 can be increased to improve the connection strength between itself and the target body 30.

[0037] Alternatively, if the length of the anti-lock screw 20 is greater than the length of the main screw 10, it will have more threads than the main screw 10, allowing for a more stable threaded connection with the target body 30 and preventing it from loosening.

[0038] Optionally, the diameter of the screw of the anti-loosening screw 20 is smaller than the diameter of the screw of the main screw 10, and the diameter of the screw head of the anti-loosening screw 20 is smaller than the diameter of the screw head of the main screw 10. This can reduce the space occupied by the anti-loosening screw 20 on the connecting surface of the target body 30, which is beneficial to saving installation space. In the same installation space, the smaller anti-loosening screw 20 can be installed in a larger number. Multiple anti-loosening screws 20 can play a better role in preventing the main screw 10 from loosening.

[0039] In one embodiment, the outer end faces of the main screw 10 and the anti-reverse screw 20 are flush, which facilitates quick inspection of whether the main screw 10 or the anti-reverse screw 20 is loose. At the same time, the flush screw head can prevent the protruding part from interfering with the installation of other parts.

[0040] Obviously, the embodiments described above are only some embodiments of this utility model, not all embodiments. The accompanying drawings show preferred embodiments of this utility model, but do not limit the patent scope of this utility model. This utility model can be implemented in many different forms; rather, the purpose of providing these embodiments is to provide a more thorough and comprehensive understanding of the disclosure of this utility model. Although this utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing specific embodiments, or make equivalent substitutions for some of the technical features. Any equivalent structures made using the content of this utility model specification and drawings, directly or indirectly applied to other related technical fields, are similarly within the patent protection scope of this utility model.

Claims

1. A screw backout mechanism, characterized by, include: The main screw (10) and the anti-reverse screw (20) are respectively screwed onto the target body (30); The main screw (10) is parallel to the axis of the anti-reverse screw (20), and the anti-reverse screw (20) is located on one side of the main screw (10); The top of the screw head of the main screw (10) is provided with a first conical surface (11) along its circumference, and the bottom of the screw head of the anti-reverse screw (20) is provided with a second conical surface (21) along its circumference. The first conical surface (11) and the second conical surface (21) face opposite directions. The main screw (10) and the anti-reverse screw (20) are tightened in sequence, and the second conical surface (21) abuts against and presses against the first conical surface (11) from the outside.

2. The screw anti-retraction mechanism according to claim 1, characterized in that, The first conical surface (11) is parallel to the second conical surface (21).

3. The screw anti-retraction mechanism according to claim 2, characterized in that, The angle between the first conical surface (11) and the horizontal plane is 30-60°.

4. The screw anti-retraction mechanism according to claim 1, characterized in that, The main screw (10) and the anti-reverse screw (20) have the same thread direction.

5. The screw anti-retraction mechanism according to claim 4, characterized in that, Multiple anti-reverse screws (20) are provided, and the multiple anti-reverse screws (20) are distributed circumferentially along the main screw (10).

6. The screw anti-retraction mechanism according to claim 1, characterized in that, The length-to-diameter ratio of the anti-reverse screw (20) is greater than that of the main screw (10).

7. The screw anti-retraction mechanism according to claim 6, characterized in that, The length of the anti-reverse screw (20) is greater than the length of the main screw (10).

8. The screw anti-retraction mechanism according to claim 6, characterized in that, The diameter of the screw of the anti-reverse screw (20) is smaller than the diameter of the screw of the main screw (10).

9. The screw anti-retraction mechanism according to claim 6, characterized in that, The diameter of the screw head of the anti-reverse screw (20) is smaller than the diameter of the screw head of the main screw (10).

10. The screw anti-retraction mechanism according to claim 1, characterized in that, The outer end faces of the main screw (10) and the anti-reverse screw (20) are flush.

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