Fastener
Through the differential pitch design of the main screw and the secondary screw and the spacer setting, the vibration resistance of the fastener is enhanced, and the problem of loosening of the nut and screw in the vibrating environment is solved, achieving the stability and safety of the connection.
Patent Information
- Application Number
- CN202421764079.0
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Priority Date
- 2024-03-06
- Filing Date
- 2024-07-24
- Publication Date
- 2025-07-08
- Estimated Expiration
- 2034-07-24
AI Technical Summary
The connection between existing nuts and screws is prone to loosening when used for long-term vibration, resulting in failure of the connection.
The pitch difference design of the main screw and the secondary screw is adopted. A spacer is set between the main nut and the secondary nut. The main nut squeezes the secondary nut axially to increase the friction force, prevent the secondary nut from rotating, and reduce the friction force in the circumferential direction.
Improves the anti-loosening performance of the fasteners, ensures a secure connection and avoids the nut falling off or loosening.
Smart Images
Figure CN223075978U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to fasteners. Background Art
[0002] Fasteners composed of screws and nuts are widely used. The nut is in threaded fit with the screw, which is convenient for assembly and disassembly. However, this also causes some inconveniences in use. For example, in applications with long-term vibrations, the connection between the nut and the screw is prone to loosening, and in severe cases, the connection may fail. Therefore, providing a fastener that can ensure stable and safe connection is one of the main problems faced in this field. Summary of the Utility Model
[0003] The purpose of the utility model is to overcome the deficiencies in the prior art and provide a fastener that can ensure stable and safe connection.
[0004] To achieve the above purpose, the utility model is realized through the following technical solutions:
[0005] A fastener, characterized by comprising:
[0006] A screw, the screw includes a main screw and a sub-screw, the main screw is provided with a first thread, the sub-screw is provided with a second thread, and the pitch of the first thread is greater than the pitch of the second thread; the main screw is connected to the sub-screw;
[0007] A main nut, the main nut is in threaded fit with the main screw;
[0008] A sub-nut, the sub-nut is in threaded fit with the sub-screw;
[0009] The sub-nut is located outside the main nut.
[0010] According to an embodiment of the utility model, one of the end faces of the main nut or the sub-nut is provided with a first flange, and the other end face is provided with a first recess; the first recess is used to accommodate the first flange.
[0011] According to an embodiment of the utility model, a spacer is provided between the main nut and the sub-nut, and the spacer is sleeved on the screw.
[0012] According to an embodiment of the utility model, the end face of the spacer is provided with a second flange; the end face of the main nut and / or the sub-nut is provided with a second recess, and the second recess is used to accommodate the second flange; or, the end face of the spacer is provided with a second recess; the end face of the main nut and / or the sub-nut is provided with a second flange, and the second recess is used to accommodate the second flange.
[0013] According to an embodiment of the utility model, the number of the spacers is two or more.
[0014] According to an embodiment of the present utility model, the spacer is a sleeve or a gasket.
[0015] According to an embodiment of the present utility model, the aperture diameter of the main nut is smaller than the outer diameter of the secondary nut.
[0016] According to an embodiment of the present utility model, the pitch of the first thread is 0.12 mm - 160 mm, and / or the pitch of the second thread is 0.1 mm - 140 mm.
[0017] According to an embodiment of the present utility model, the pitch of the first thread is more than 20% larger than the pitch of the second thread.
[0018] According to an embodiment of the present utility model, the pitches of the first thread and the second thread are respectively selected from the following values: 0.12 mm, 0.15 mm, 0.2 mm, 0.25 mm, 0.3 mm, 0.35 mm, 0.4 mm, 0.5 mm, 0.6 mm, 0.7 mm, 0.8 mm, 0.9 mm, 1 mm, 1.25 mm, 1.5 mm, 1.75 mm, 2 mm, 2.25 mm, 2.5 mm, 2.75 mm, 3 mm, 3.25 mm, 3.5 mm, 3.75 mm, 4 mm, 4.5 mm, 5 mm, 5.5 mm, 6 mm, 6.5 mm, 7 mm, 8 mm, 9 mm, 10 mm, 11 mm, 12 mm, 14 mm, 16 mm, 18 mm, 20 mm, 22 mm, 25 mm, 28 mm, 32 mm, 36 mm, 40 m, 45 mm, 50 mm, 60 mm, 70 mm, 80 mm, 90 mm, 105 mm, 120 mm, 140 mm, 160 mm; the pitch of the second thread is selected from the following values: 0.1 mm, 0.12 mm, 0.15 mm, 0.2 mm, 0.25 mm, 0.3 mm, 0.35 mm, 0.4 mm, 0.5 mm, 0.6 mm, 0.7 mm, 0.8 mm, 0.9 mm, 1 mm, 1.25 mm, 1.5 mm, 1.75 mm, 2 mm, 2.25 mm, 2.5 mm, 2.75 mm, 3 mm, 3.25 mm, 3.5 mm, 3.75 mm, 4 mm, 4.5 mm, 5 mm, 5.5 mm, 6 mm, 6.5 mm, 7 mm, 8 mm, 9 mm, 10 mm, 11 mm, 12 mm, 14 mm, 16 mm, 18 mm, 20 mm, 22 mm, 25 mm, 28 mm, 32 mm, 36 mm, 40 m, 45 mm, 50 mm, 60 mm, 70 mm, 80 mm, 90 mm, 105 mm, 120 mm, 140 mm.
[0019] According to an embodiment of the present utility model, the diameter of the main screw is greater than the diameter of the auxiliary screw.
[0020] According to an embodiment of the present utility model, the diameter of the main screw is selected from the following specifications: M4, M5, M6, M8, M10, M12, M14, M16, M18, M20, M22, M24, M27, M30, M36, M42, M48, M56, M64; the diameter of the auxiliary screw is selected from the following specifications: M4, M5, M6, M8, M10, M12, M14, M16, M18, M20, M22, M24, M27, M30, M36, M42, M48, M56, M60, M64, M68, M72, M76, M80.
[0021] In the present utility model, the outer side refers to the direction in which the auxiliary nut is located in the disassembly direction of the main nut, that is, the direction that blocks the disassembly of the main nut.
[0022] In the fastener of the present utility model, since the pitch of the main screw is greater than the pitch of the auxiliary screw, the axial movement distance of the main nut when it rotates one circle is greater than the axial movement distance of the auxiliary nut when it rotates one circle. Therefore, when subjected to vibration, the main nut axially presses the auxiliary nut, increasing the frictional force between the auxiliary nut and the auxiliary screw, and the auxiliary nut cannot rotate. When the auxiliary nut cannot rotate, it axially hinders the movement of the main nut. Therefore, the main nut will not fall off or become loose. In the present utility model, since the main nut axially abuts against the auxiliary nut to increase the frictional force between the auxiliary nut and the auxiliary screw, although there is a circumferential frictional force between the main nut and the auxiliary nut when they are in contact, the circumferential frictional force is not sufficient to rotate the auxiliary nut. A spacer is provided between the main nut and the auxiliary nut, and the end faces of the main nut and the auxiliary nut are not in direct contact, reducing the circumferential frictional force transmitted from the main nut to the auxiliary nut. When the number of spacers is multiple, the circumferential frictional force transmitted from the main nut to the auxiliary nut can be further reduced. Description of the Drawings
[0023] Figure 1 The structure diagram of the fastener in Embodiment 1 of the present utility model is shown.
[0024] Figure 2 The structure diagram of the screw in the present utility model.
[0025] Figure 3 The structure diagram of the main nut in Embodiment 2 of the present utility model.
[0026] Figure 4 The structure diagram of the auxiliary nut in Embodiment 2 of the present utility model.
[0027] Figure 5 The structure diagram of the fastener in Embodiment 3 of the present utility model.
[0028] Figure 6 Schematic diagram of the fastener structure in Embodiment 4 of the present utility model.
[0029] Figure 7 Schematic diagram of the main nut structure in Embodiment 4 of the present utility model.
[0030] Figure 8 Schematic diagram of the sleeve structure in Embodiment 4 of the present utility model.
[0031] Figure 9 Schematic diagram of the sleeve structure observed from another angle in Embodiment 4 of the present utility model.
[0032] Figure 10 Schematic diagram of the auxiliary nut structure in Embodiment 4 of the present utility model. Detailed implementation manners
[0033] The present utility model will be described in detail below with reference to the accompanying drawings:
[0034] Embodiment 1
[0035] As Figure 1 and Figure 2 shown, the fastener 100 includes a screw rod 110, a main nut 120 and an auxiliary nut 130. The screw rod 110 includes a main screw rod 111 and an auxiliary screw rod 112. The main screw rod 111 is provided with a first thread 113, and the auxiliary screw rod 112 is provided with a second thread 114. The pitch of the first thread 113 is greater than the pitch of the second thread 114. In this embodiment, the diameter specification of the main screw rod 111 is M20, and the pitch of the first thread 113 is 2 mm. The diameter specification of the auxiliary screw rod 111 is M16, and the pitch of the second thread 114 is 1.5 mm. One end of the main screw rod 111 is directly connected to the auxiliary screw rod 112, and the other end of the main screw rod 111 is provided with a head 115. The main nut 120 is in threaded cooperation with the main screw rod 111. The auxiliary nut 130 is in threaded cooperation with the auxiliary screw rod 112. The aperture of the main nut 120 is smaller than the outer diameter of the auxiliary nut 130. The auxiliary nut 130 is located outside the main nut 120. The "outside" referred to in the present utility model means that the auxiliary nut 130 is located in the disassembly direction of the main nut 120, that is, the direction that blocks the disassembly of the main nut 120.
[0036] Embodiment 2
[0037] As Figure 2 、 Figure 3 and Figure 4As shown, the fastener 100 includes a screw rod 110, a main nut 120, and a sub-nut 130. The screw rod 110 includes a main screw rod 111 and a sub-screw rod 112. The main screw rod 111 is provided with a first thread 113, and the sub-screw rod 112 is provided with a second thread 114. The pitch of the first thread 113 is greater than the pitch of the second thread 114. In this embodiment, the diameter specification of the main screw rod 111 is M24, and the pitch of the first thread 113 is 1.5 mm. The diameter specification of the sub-screw rod 111 is M10, and the pitch of the second thread 114 is 1 mm. One end of the main screw rod 111 is directly connected to the sub-screw rod 112, and the other end of the main screw rod 111 is provided with a head 115. The main nut 120 is in threaded cooperation with the main screw rod 111. The end face of the main nut 120 is provided with a first flange 121. The sub-nut 130 is in threaded cooperation with the sub-screw rod 112. The end face of the sub-nut 130 is provided with a first recess 131. The first recess 131 is used to accommodate the first flange 121. The aperture of the main nut 120 is smaller than the outer diameter of the sub-nut 130.
[0038] Embodiment 3
[0039] As Figure 2 and Figure 5 As shown, the fastener 100 includes a screw rod 110, a main nut 120, and a sub-nut 130. The screw rod 110 includes a main screw rod 111 and a sub-screw rod 112. The main screw rod 111 is provided with a first thread 113, and the sub-screw rod 112 is provided with a second thread 114. The pitch of the first thread 113 is greater than the pitch of the second thread 114. In this embodiment, the diameter specification of the main screw rod 111 is M30, and the pitch of the first thread 113 is 3.5 mm. The diameter specification of the sub-screw rod 111 is M22, and the pitch of the second thread 114 is 2.5 mm. One end of the main screw rod 111 is directly connected to the sub-screw rod 112, and the other end of the main screw rod 111 is provided with a head 115. The main nut 120 is in threaded cooperation with the main screw rod 111. The sub-nut 130 is in threaded cooperation with the sub-screw rod 112. The aperture of the main nut 120 is smaller than the outer diameter of the sub-nut 130. A sleeve 141 is provided between the main nut 120 and the sub-nut 130. The sleeve 141 is a spacer and is sleeved on the screw rod 110. Both ends of the sleeve 141 respectively abut against the main nut 120 and the sub-nut 130.
[0040] Embodiment 4
[0041] As Figure 2 、 Figures 7 to 10As shown, the fastener 100 includes a screw rod 110, a main nut 120, and a sub-nut 130. The screw rod 110 includes a main screw rod 111 and a sub-screw rod 112. The main screw rod 111 is provided with a first thread 113, and the sub-screw rod 112 is provided with a second thread 114. The pitch of the first thread 113 is greater than the pitch of the second thread 114. In this embodiment, the diameter specification of the main screw rod 111 is M30, and the pitch of the first thread 113 is 3.5 mm. The diameter specification of the sub-screw rod 111 is M22, and the pitch of the second thread 114 is 2.5 mm. One end of the main screw rod 111 is directly connected to the sub-screw rod 112, and the other end of the main screw rod 111 is provided with a head 115. The main nut 120 is in threaded engagement with the main screw rod 111. The sub-nut 130 is in threaded engagement with the sub-screw rod 112. The aperture of the main nut 120 is smaller than the outer diameter of the sub-nut 130. A sleeve 141 is provided between the main nut 120 and the sub-nut 130. The sleeve 141 is a spacer and is sleeved on the screw rod 110. Both ends of the sleeve 141 respectively abut against the main nut 120 and the sub-nut 130. The end face of the main nut 120 is provided with a second flange 122. The end face of the sub-nut 130 is provided with a second recess 132. One end of the sleeve 141 is provided with a second recess 142, and the other end is provided with a second flange 143. The second recess 142 on the sleeve 141 accommodates the second flange 122 on the main nut 120. The second recess 132 on the sub-nut 130 accommodates the second flange 143 on the sleeve 141.
[0042] Embodiment 5
[0043] The fastener 100 includes a screw rod 110, a main nut 120, and a sub-nut 130. The screw rod 110 includes a main screw rod 111 and a sub-screw rod 112. The main screw rod 111 is provided with a first thread 113, and the sub-screw rod 112 is provided with a second thread 114. The pitch of the first thread 113 is greater than the pitch of the second thread 114. In this embodiment, the diameter specification of the main screw rod 111 is M30, and the pitch of the first thread 113 is 3.5 mm. The diameter specification of the sub-screw rod 111 is M22, and the pitch of the second thread 114 is 2.5 mm. One end of the main screw rod 111 is directly connected to the sub-screw rod 112, and the other end of the main screw rod 111 is provided with a head 115. The main nut 120 is in threaded engagement with the main screw rod 111. The sub-nut 130 is in threaded engagement with the sub-screw rod 112. The aperture of the main nut 120 is smaller than the outer diameter of the sub-nut 130. A gasket 142 is provided between the main nut 120 and the sub-nut 130. The gasket 142 is a spacer, and the number is three. The gasket 142 is sleeved on the screw rod 110. The gasket 142 is clamped by the main nut 120 and the sub-nut 130.
[0044] According to the structure of Example 1, the test data of the fasteners at different pitches and different diameters are shown in the following table, where the thread pitch in the table below is the pitch. In the row of the same serial number, the fasteners with two thread pitch values are arranged according to the structure of Example 1, where the larger value is the first thread pitch and the smaller value is the second thread pitch. The thread pitch with only one value is a conventional fastener with no change in pitch. M16-18 means the main screw diameter is M18 and the secondary screw diameter is M16. M16 is a fastener with one diameter. Other similar values have the same meaning.
[0045]
[0046]
[0047] It can be seen from the above table that, compared with the fasteners in the prior art, the loosening failure value of the fasteners in the utility model is significantly improved, and even when the torque is significantly increased, the nut does not loosen, the connection between the nut and the bolt is more stable, and it is safer to use.
[0048] In the fastener of the utility model, since the pitch of the main screw is greater than the pitch of the secondary screw, the axial movement distance of the main nut when it rotates one circle is greater than the axial movement distance when the secondary nut rotates one circle. Therefore, when subjected to vibration, the main nut squeezes the secondary nut axially, so that the friction between the secondary nut and the secondary screw increases, and the secondary nut cannot rotate. When the secondary nut cannot rotate, the movement of the main nut is hindered in the axial direction, so the main nut will not fall off or loosen. In the utility model, since the main nut presses against the secondary nut in the axial direction, the friction between the secondary nut and the secondary screw increases. Although the main nut and the secondary nut have friction in the circumferential direction when they contact, the friction in the circumferential direction is not enough to rotate the secondary nut. A spacer is provided between the main nut and the secondary nut, and the end faces of the main nut and the secondary nut are not in direct contact, which reduces the friction in the circumferential direction transmitted from the main nut to the secondary nut. When there are multiple spacers, the friction in the circumferential direction transmitted from the main nut to the secondary nut can be further reduced.
[0049] The embodiments of the present invention are only used to illustrate the present invention and do not constitute a limitation on the scope of the claims. Other substantially equivalent alternatives that can be thought of by those skilled in the art are all within the protection scope of the present invention.
Claims
1. A fastener, characterized in that, Comprising: A screw, the screw includes a main screw and an auxiliary screw, the main screw is provided with a first thread, the auxiliary screw is provided with a second thread, and the pitch of the first thread is greater than the pitch of the second thread; the main screw is connected to the auxiliary screw; A main nut, the main nut is in threaded cooperation with the main screw; An auxiliary nut, the auxiliary nut is in threaded cooperation with the auxiliary screw; The auxiliary nut is located outside the main nut.
2. The fastener according to claim 1, characterized in that, One of the end faces of the main nut or the auxiliary nut is provided with a first flange, and the other end face is provided with a first recess; the first recess is used for accommodating the first flange.
3. The fastener according to claim 1, characterized in that, A spacer is provided between the main nut and the auxiliary nut, and the spacer is sleeved on the screw.
4. The fastener according to claim 3, wherein The end face of the spacer is provided with a second flange; the end face of the main nut and / or the auxiliary nut is provided with a second recess, and the second recess is used for accommodating the second flange; or, the end face of the spacer is provided with a second recess; the end face of the main nut and / or the auxiliary nut is provided with a second flange, and the second recess is used for accommodating the second flange.
5. The fastener according to claim 3, wherein The number of the spacers is more than two.
6. The fastener according to claim 3, wherein, The spacer is a sleeve or a gasket.
7. The fastener according to claim 1, characterized in that, The inner diameter of the main nut is smaller than the outer diameter of the auxiliary nut.
8. The fastener according to claim 1, characterized in that, The pitch of the first thread is 0.12 mm - 160 mm, and / or the pitch of the second thread is 0.1 mm - 140 mm.
9. The fastener according to claim 1, wherein The pitch of the first thread is more than 20% larger than the pitch of the second thread.
10. The fastener according to claim 1, characterized in that, The pitch of the first thread and the pitch of the second thread are respectively selected from the following values: 0.12mm, 0.15mm, 0.2mm, 0.25mm, 0.3mm, 0.35mm, 0.4mm, 0.5mm, 0.6mm, 0.7mm, 0.8mm, 0.9mm, 1mm, 1.25mm, 1.5mm, 1.75mm, 2mm, 2.25mm, 2.5mm, 2.75mm, 3mm, 3.25mm, 3.5mm, 3.75mm, 4mm, 4.5mm, 5mm, 5.5mm, 6mm, 6.5mm, 7mm, 8mm, 9mm, 10mm, 11mm, 12mm, 14mm, 16mm, 18mm, 20mm, 22mm, 25mm, 28mm, 32mm, 36mm, 40m, 45mm, 50mm, 60mm, 70mm, 80mm, 90mm, 105mm, 120mm, 140mm, 160mm; the pitch of the second thread is selected from the following values: 0.1mm, 0.12mm, 0.15mm, 0.2mm, 0.25mm, 0.3mm, 0.35mm, 0.4mm, 0.5mm, 0.6mm, 0.7mm, 0.8mm, 0.9mm, 1mm, 1.25mm, 1.5mm, 1.75mm, 2mm, 2.25mm, 2.5mm, 2.75mm, 3mm, 3.25mm, 3.5mm, 3.75mm, 4mm, 4.5mm, 5mm, 5.5mm, 6mm, 6.5mm, 7mm, 8mm, 9mm, 10mm, 11mm, 12mm, 14mm, 16mm, 18mm, 20mm, 22mm, 25mm, 28mm, 32mm, 36mm, 40m, 45mm, 50mm, 60mm, 70mm, 80mm, 90mm, 105mm, 120mm, 140mm.
11. The fastener according to claim 1, wherein The diameter of the main screw is greater than the diameter of the auxiliary screw.
12. The fastener according to claim 5, characterized in that, The diameter of the main screw is selected from the following specifications: M4, M5, M6, M8, M10, M12, M14, M16, M18, M20, M22, M24, M27, M30, M36, M42, M48, M56, M64; the diameter of the auxiliary screw is selected from the following specifications: M4, M5, M6, M8, M10, M12, M14, M16, M18, M20, M22, M24, M27, M30, M36, M42, M48, M56, M60, M64, M68, M72, M76, M80.