Screw anti-loosening structure with spring tip cone

Abstract

The invention discloses a screw locking structure with a spring tip cone, which comprises a screw which penetrates through a first connected piece and then is in threaded connection with a second connected piece, the lower section of the screw is a locking section, the locking section is in threaded connection with the second connected piece, the locking section is provided with a first taper hole, and the spring tip cone is arranged in the first taper hole. A convex cone matched with the first conical hole is arranged in the threaded hole of the second connected piece, the smaller end of the convex cone faces the head of the screw, a spring is fixed to the larger end of the convex cone and connected with the second connected piece, gaps are formed in the hole wall of the first conical hole and distributed in the axial direction of the screw, and one end of each gap extends to the bottom of the screw. Compared with the prior art, the structure is simple, the convex cone is sleeved with the first conical hole and downwards extrudes the spring, the convex cone opens the locking section so as to increase radial pressure, and the external thread of the locking section tightly holds the internal thread of the second connected piece so as to achieve the anti-loosening effect; the spring can apply axial force to the screw through the convex cone to increase the pre-tightening force of the screw so as to achieve looseness prevention.

Description

Technical Field

[0001] The present invention relates to the technical field of fastener manufacturing, and particularly relates to a screw loosening prevention structure with a spring top cone. Background Art

[0002] The lower end thread of an existing screw is screwed into the threaded hole of the lower-layer connected part, the middle part passes through the through hole of the upper-layer connected part, and the lower end of the screw head is a toothed washer. Although it has a certain loosening prevention effect, however, the lower end thread connection screwed into the threaded hole of the lower-layer connected part is not loosening-proof. Under the action of a vibration load, the existing screw connection is still prone to looseness, and fatigue failure occurs during a long-term vibration process, causing the equipment to malfunction or even be damaged. Summary of the Invention

[0003] The present invention provides a screw loosening prevention structure with a spring top cone to solve the problem of poor loosening prevention effect of the lower end thread of the existing screw.

[0004] The present invention provides a screw loosening prevention structure with a spring top cone, including a screw that passes through a first connected part and is threadedly connected to a second connected part. The lower section of the screw is a locking section, the locking section is threadedly connected to the second connected part, the locking section is provided with a first tapered hole, a convex cone that cooperates with the first tapered hole is provided in the threaded hole of the second connected part, the smaller end of the convex cone faces the head of the screw, a spring is fixed to the larger end of the convex cone, the spring is connected to the second connected part, a gap is provided on the hole wall of the first tapered hole, the gap is distributed along the axial direction of the screw, and one end extends to the bottom of the screw.

[0005] Preferably, an annular groove is provided on the outer side of the upper end of the locking section, and the gap extends into the annular groove.

[0006] Preferably, a washer is fixed to the head of the screw, and anti-loosening teeth are provided on the washer.

[0007] Preferably, the second connected part is provided with a positioning hole adapted to the spring, and the positioning hole is located below the threaded hole.

[0008] Preferably, there are four gaps, and the four gaps are evenly distributed in the circumferential direction of the locking section.

[0009] Preferably, a positioning post is fixed to the lower end of the spring, and the second connected part is provided with a positioning groove adapted to the positioning post, and the positioning groove communicates with the positioning hole.

[0010] Preferably, the structure of the positioning post is the same as that of the convex cone, and the positioning post and the convex cone are symmetrically distributed along the spring.

[0011] Preferably, the convex cone, the spring and the positioning column are an integrated structure, and a central hole is provided on the convex cone, and the central hole passes through the spring and the positioning column.

[0012] Preferably, the diameter of the positioning hole is smaller than the diameter of the threaded hole.

[0013] Compared with the existing technology, the present invention has a simple structure. When the screw is screwed into the second connected part, the first tapered hole is sleeved on the convex cone and presses the spring downward. The convex cone expands the locking section, thereby increasing radial pressure. The external thread of the locking section grips the internal thread of the second connected part, thereby preventing loosening. At the same time, the spring exerts axial force on the screw through the convex cone, increasing the screw's pre-tightening force to prevent loosening. The two cooperate to achieve a good anti-loosening effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] In order to more clearly illustrate the technical solutions in the present invention or the prior art, 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 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 It is a structural schematic diagram of the present invention;

[0016] Figure 2 Schematic diagram of the cooperation between the screw and the top cone of the present invention;

[0017] Figure 3 It is a structural schematic diagram of the screw of the present invention;

[0018] Figure 4 It is a structural schematic diagram of the top cone of the present invention;

[0019] Figure 5 is a schematic structural diagram of the second connected member of the present invention;

[0020] Figure 6 It is a partial structural schematic diagram of the screw of the present invention.

[0021] Reference numerals:

[0022] 1. First connected part, 2. Second connected part, 3. Screw, 4. Cone, 5. Spring, 6. Positioning column, 21. Threaded hole, 22. Positioning hole, 23. Positioning groove, 31. Locking section, 311. First tapered hole, 312. Slit, 313. Annular groove, 32. Gasket, 321. Anti-loosening tooth, 100. Center hole. DETAILED DESCRIPTION

[0023] To make the objectives, technical solutions, and advantages of the present invention more clear, the technical solutions of the present invention will be clearly and completely described below in conjunction with the accompanying drawings. Obviously, the embodiments described are only some of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts shall fall within the scope of protection of the present invention.

[0024] Refer to the attached Figure 1 This embodiment provides a screw anti-loosening structure with a spring top cone, comprising a screw 3 that passes through a first connected member 1 and is threadedly connected to a second connected member 2. The lower section of the screw 3 is a locking section 31, which is threadedly connected to the second connected member 2. Figure 2 The locking section 31 is provided with a first tapered hole 311, and the threaded hole 21 of the second connected part 2 is provided with a convex cone 4 that cooperates with the first tapered hole 311. The smaller end of the convex cone 4 faces the head of the screw 3, and the larger end of the convex cone 4 is fixed with a spring 5. The spring 5 is connected to the second connected part 2 and is supported by the second connected part 2; a gap 312 is provided on the hole wall of the first tapered hole 311, and the gap 312 is distributed along the axial direction of the screw 3, and one end extends to the bottom of the screw 3. This structural design facilitates the opening of the locking section 31. In the present invention, first, the convex cone 4 and the spring 5 are placed in the threaded hole 21 of the second connected part 2, the first connected part 1 is placed on the second connected part 2, and then the screw 3 is screwed into the threaded hole 21 of the second connected part 2 through the through hole of the first connected part 1. During the tightening process, the first tapered hole 311 of the locking section 31 is sleeved on the convex cone 4, and the elastic force of the spring 5 drives the convex cone 4 to expand and open the first tapered hole 311 of the locking section 31, so that the external thread of the locking section 31 tightly embraces the internal thread of the second connected part 2, achieving the purpose of preventing loosening. At the same time, the spring 5 below the convex cone 4 is compressed, which increases the effect of the pre-tightening force of the screw 3. The overall structure of the present invention is simple, and the convex cone 4 and the spring 5 simultaneously apply radial pressure and pre-tightening force to the screw 3 to prevent loosening, and the anti-loosening effect is good.

[0025] In another embodiment of the present invention, an annular groove 313 is provided on the outer side of the upper end of the locking section 31. The gap 312 extends into the annular groove 313. The annular groove 313 is located outside the first tapered hole 311. This structural design reduces the radial stiffness of the first tapered hole 311, facilitating the locking section 31 to be opened by the convex cone 4.

[0026] As another embodiment of the present invention: Figure 6, a gasket 32 is fixed to the head of the screw 3, and anti-loosening teeth 321 are provided on the gasket 32. The tooth surfaces on both sides of the anti-loosening teeth 321 are inconsistent: when the screw 3 is tightened clockwise, the gentle tooth surface can smoothly rotate along the surface of the first connected part 1; when the screw 3 has a tendency to loosen counterclockwise, the steep tooth surface at the other end can increase the resistance to prevent the screw 3 from loosening. Through this structural design, the anti-loosening structure of the screw 3 has a triple anti-loosening design: First, the anti-loosening teeth 321 of the gasket 32 increase the friction to prevent loosening; Second, the locking section 31 of the screw 3 is opened under the pressure of the convex cone 4, increasing the radial force so that the external thread of the locking section 31 holds the internal thread of the second connected part 2 to achieve the anti-loosening effect; Third, after being compressed, the spring 5 increases the pre-tightening force on the screw 3 through the convex cone 4 to prevent loosening.

[0027] As another embodiment of the present invention: Refer to the attached Figure 5 , the second connected part 2 is provided with a positioning hole 22 adapted to the spring 5, and the positioning hole 22 is located below the threaded hole 21. This setting enables the spring 5 to only elastically deform along the positioning hole 22.

[0028] As another embodiment of the present invention: Refer to the attached Figure 2 , there are four gaps 312, and the four gaps 312 are evenly distributed in the circumferential direction of the locking section 31. This structural design enables the external thread of the locking section 31 to better hold the internal thread of the second connected part 2.

[0029] As another embodiment of the present invention: A positioning post 6 is fixed to the lower end of the spring 5, and the second connected part 2 is provided with a positioning groove 23 adapted to the positioning post 6, and the positioning groove 23 communicates with the positioning hole 22. Refer to the attached Figure 4 , the convex cone 4, the spring 5 and the positioning post 6 form a top cone, and the positioning post 6 is inserted into the positioning groove 23 for fitting and positioning, and provides support for the top cone.

[0030] As another embodiment of the present invention: The structure of the positioning post 6 is the same as that of the convex cone 4, and the positioning post 6 and the convex cone 4 are symmetrically distributed along the spring 5. This structure is convenient for installation, and either end of the top cone can be inserted into the positioning groove 23 when placed into the threaded hole 21.

[0031] As another embodiment of the present invention: The convex cone 4, the spring 5 and the positioning post 6 are of an integral structure, and a central hole 100 is provided on the convex cone 4, and the central hole 100 passes through the spring 5 and the positioning post 6. Drill the central hole 100, and then mill out the spring 5 between the convex cone 4 and the positioning post 6 to obtain an integral top cone structure.

[0032] As another embodiment of the present invention: The aperture of the positioning hole 22 is smaller than the aperture of the threaded hole 21.

[0033] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements on some of the technical features; and these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the various embodiments of the present invention.

Claims

1. A screw loosening prevention structure with a spring-loaded top cone, characterized in that, It includes a screw that passes through the first connected part and is threadedly connected to the second connected part. The lower section of the screw is a locking section, and the locking section is threadedly connected to the second connected part. The locking section is provided with a first tapered hole, and a convex cone that cooperates with the first tapered hole is provided in the threaded hole of the second connected part. The smaller end of the convex cone faces the head of the screw, and a spring is fixed to the larger end of the convex cone. The spring is connected to the second connected part. A gap is provided on the hole wall of the first tapered hole. The gap is distributed along the axial direction of the screw and one end extends to the bottom of the screw.

2. The screw loosening prevention structure with a spring-loaded top cone according to claim 1, characterized in that An annular groove is provided on the outer side of the upper end of the locking section, and the gap extends into the annular groove.

3. The screw loosening prevention structure with a spring-loaded top cone according to claim 1, characterized in that, A gasket is fixed to the head of the screw, and anti-loosening teeth are provided on the gasket.

4. The anti-loosening structure of the screw with a spring-loaded top cone according to claim 2, characterized in that, The second connected part is provided with a positioning hole adapted to the spring, and the positioning hole is located below the threaded hole.

5. The anti-loosening structure of the screw with a spring-loaded top cone according to claim 4, characterized in that, There are four gaps, and the four gaps are evenly distributed in the circumferential direction of the locking section.

6. The anti-loosening structure of a screw with a spring-loaded top cone according to claim 5, wherein A positioning post is fixed to the lower end of the spring, and the second connected part is provided with a positioning groove adapted to the positioning post. The positioning groove communicates with the positioning hole.

7. The screw loosening prevention structure with a spring-loaded top cone according to claim 6, characterized in that, The structure of the positioning post is the same as that of the convex cone, and the positioning post and the convex cone are symmetrically distributed along the spring.

8. The anti-loosening structure of a screw with a spring-loaded top cone according to claim 7, characterized in that, The convex cone, the spring and the positioning post are of an integral structure, and a central hole is provided on the convex cone. The central hole passes through the spring and the positioning post.

9. The anti-loosening structure of the screw with a spring-loaded top cone according to claim 8, characterized in that, The aperture of the positioning hole is smaller than the aperture of the threaded hole.

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