Fastener

Abstract

The invention relates to a fastener which is characterized in that the fastener comprises a screw rod, the screw rod comprises a main screw rod body and an auxiliary screw rod body, the main screw rod body is provided with a first thread, the auxiliary screw rod body is provided with a second thread, and the thread pitch of the first thread is larger than that of the second thread; the main screw rod is connected with the auxiliary screw rod; the main nut is in threaded fit with the main screw rod; the auxiliary nut is in threaded fit with the auxiliary screw rod; the auxiliary nut is located on the outer side of the main nut. According to the fastener, due to the fact that the screw pitch of the main screw is larger than that of the auxiliary screw, the axial movement distance of the main nut rotating by one circle is larger than that of the auxiliary nut rotating by one circle. Therefore, when the nut is vibrated, the main nut extrudes the auxiliary nut in the axial direction, the friction force between the auxiliary nut and the auxiliary screw is increased, and the auxiliary nut cannot rotate. And when the auxiliary nut cannot rotate, the movement of the main nut is blocked along the axial direction, so that the main nut cannot fall off or loosen.

Description

Technical Field

[0001] The present invention relates to fasteners. Background Art

[0002] Fasteners consisting of screws and nuts are widely used. The nut and screw threads cooperate to facilitate assembly and disassembly, but this also causes some inconvenience in use. For example, in situations where there is long-term vibration, the connection between the nut and the screw is easy to loosen, which may lead to connection failure in serious cases. Therefore, providing a fastener that can ensure a stable and safe connection is one of the main problems faced by the field. Summary of the invention

[0003] The purpose of the present invention is to overcome the deficiencies in the prior art and provide a fastener that can ensure a firm and safe connection.

[0004] To achieve the above objectives, the present invention is implemented through the following technical solutions:

[0005] The fastener is characterized by comprising:

[0006] A screw, the screw comprising a main screw and a secondary screw, the main screw being provided with a first thread, the secondary screw being provided with a second thread, the pitch of the first thread being greater than the pitch of the second thread; the main screw being connected to the secondary screw;

[0007] A main nut, the main nut being threadably matched with the main screw;

[0008] A secondary nut, the secondary nut is threadably matched with the secondary screw;

[0009] The secondary nut is located outside the main nut.

[0010] According to one embodiment of the present invention, the end surface of one of the main nut or the auxiliary nut is provided with a first flange, and the end surface of the other is provided with a first recess; the first recess is used to accommodate the first flange.

[0011] According to one embodiment of the present invention, a spacer is provided between the main nut and the auxiliary nut, and the spacer is sleeved on the screw rod.

[0012] According to one embodiment of the present invention, the end face of the spacer is provided with a second flange; the end face of the main nut and / or the secondary 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 secondary nut is provided with a second flange, and the second recess is used to accommodate the second flange.

[0013] According to one embodiment of the present invention, the number of the spacers is two or more.

[0014] According to one embodiment of the present invention, the spacer is a sleeve or a gasket.

[0015] According to one embodiment of the present invention, the hole diameter of the main nut is smaller than the outer diameter of the secondary nut.

[0016] According to one embodiment of the present invention, 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 one embodiment of the present invention, the pitch of the first thread is greater than the pitch of the second thread by more than 20%.

[0018] According to one embodiment of the present invention, 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, 1 6mm, 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, 3.25m m, 3.5mm, 3.75mm, 4mm, 4.5mm, 5mm, 5.5mm, 6mm, 6.5mm, 7mm, 8mm, 9mm, 10mm, 11mm, 12mm, 14mm, 16mm, 18 mm, 20mm, 22mm, 25mm, 28mm, 32mm, 36mm, 40m, 45mm, 50mm, 60mm, 70mm, 80mm, 90mm, 105mm, 120mm, 140mm.

[0019] According to one embodiment of the present invention, the diameter of the main screw is greater than the diameter of the secondary screw.

[0020] According to one embodiment of the present invention, 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 secondary 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] The outer side mentioned in the present invention refers to the auxiliary nut being located in the disassembly direction of the main nut, that is, blocking the disassembly direction of the main nut.

[0022] In the fastener of the present invention, 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, increasing the friction between the secondary nut and the secondary screw, 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 present invention, since the main nut presses against the secondary nut in the axial direction, the friction between the secondary nut and the secondary screw is increased, although the main nut and the secondary nut have friction in the circumferential direction when they are in 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 the number of spacers is multiple, the friction in the circumferential direction transmitted from the main nut to the secondary nut can be further reduced. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 Shown is a schematic diagram of the fastener structure in Example 1 of the present invention.

[0024] Figure 2 It is a schematic diagram of the screw structure in the present invention.

[0025] Figure 3 This is a schematic diagram of the main nut structure in Example 2 of the present invention.

[0026] Figure 4 This is a schematic diagram of the secondary nut structure in Example 2 of the present invention.

[0027] Figure 5 This is a schematic diagram of the fastener structure in Example 3 of the present invention.

[0028] Figure 6 This is a schematic diagram of the fastener structure in Example 4 of the present invention.

[0029] Figure 7 This is a schematic diagram of the main nut structure in Example 4 of the present invention.

[0030] Figure 8 This is a schematic diagram of the sleeve structure in Example 4 of the present invention.

[0031] Fig. 9 This is a schematic structural diagram of the sleeve in Example 4 of the present invention observed from another angle.

[0032] Fig.10 This is a schematic diagram of the secondary nut structure in Example 4 of the present invention. DETAILED DESCRIPTION

[0033] The present invention is described in detail below in conjunction with the accompanying drawings:

[0034] Example 1

[0035] like Figure 1 and Figure 2 As shown, the fastener 100 includes a screw 110, a main nut 120 and a secondary nut 130. The screw 110 includes a main screw 111 and a secondary screw 112, wherein the main screw 111 is provided with a first thread 113, and the secondary screw 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 111 is M20, and the pitch of the first thread 113 is 2 mm. The diameter specification of the secondary screw 111 is M16, and the pitch of the second thread 114 is 1.5 mm. One end of the main screw 111 is directly connected to the secondary screw 112, and the other end of the main screw 111 is provided with a head 115. The main nut 120 is threadedly matched with the main screw 111. The secondary nut 130 is threadedly matched with the secondary screw 112. The aperture of the main nut 120 is smaller than the outer diameter of the secondary nut 130. The secondary nut 130 is located outside the primary nut 120. The term "outside" in the present invention means that the secondary nut 130 is located in the disassembly direction of the primary nut 120, that is, it blocks the disassembly direction of the primary nut 120.

[0036] Example 2

[0037] like Figure 2 , Figure 3 and Figure 4As shown, the fastener 100 includes a screw 110, a main nut 120 and a secondary nut 130. The screw 110 includes a main screw 111 and a secondary screw 112, wherein the main screw 111 is provided with a first thread 113, and the secondary screw 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 111 is M24, and the pitch of the first thread 113 is 1.5 mm. The diameter specification of the secondary screw 111 is M10, and the pitch of the second thread 114 is 1 mm. One end of the main screw 111 is directly connected to the secondary screw 112, and the other end of the main screw 111 is provided with a head 115. The main nut 120 is threadedly matched with the main screw 111. The end surface of the main nut 120 is provided with a first flange 121. The secondary nut 130 is threadedly matched with the secondary screw 112. The end surface of the secondary nut 130 is provided with a first recess 131. The first recess 131 is used to accommodate the first flange 121. The hole diameter of the main nut 120 is smaller than the outer diameter of the secondary nut 130.

[0038] Example 3

[0039] like Figure 2 and Figure 5 As shown, the fastener 100 includes a screw 110, a main nut 120 and a secondary nut 130. The screw 110 includes a main screw 111 and a secondary screw 112, wherein the main screw 111 is provided with a first thread 113, and the secondary screw 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 111 is M30, and the pitch of the first thread 113 is 3.5 mm. The diameter specification of the secondary screw 111 is M22, and the pitch of the second thread 114 is 2.5 mm. One end of the main screw 111 is directly connected to the secondary screw 112, and the other end of the main screw 111 is provided with a head 115. The main nut 120 is threadedly matched with the main screw 111. The secondary nut 130 is threadedly matched with the secondary screw 112. The aperture of the main nut 120 is smaller than the outer diameter of the secondary nut 130. A sleeve 141 is provided between the main nut 120 and the auxiliary nut 130. The sleeve 141 is a spacer, which is sleeved on the screw rod 110. The two ends of the sleeve 141 respectively abut against the main nut 120 and the auxiliary nut 130.

[0040] Example 4

[0041] like Figure 2 , Figures 7 to 10As shown, the fastener 100 includes a screw 110, a main nut 120 and a secondary nut 130. The screw 110 includes a main screw 111 and a secondary screw 112, wherein the main screw 111 is provided with a first thread 113, and the secondary screw 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 111 is M30, and the pitch of the first thread 113 is 3.5 mm. The diameter specification of the secondary screw 111 is M22, and the pitch of the second thread 114 is 2.5 mm. One end of the main screw 111 is directly connected to the secondary screw 112, and the other end of the main screw 111 is provided with a head 115. The main nut 120 is threadedly matched with the main screw 111. The secondary nut 130 is threadedly matched with the secondary screw 112. The aperture of the main nut 120 is smaller than the outer diameter of the secondary nut 130. A sleeve 141 is provided between the main nut 120 and the secondary nut 130. The sleeve 141 is a spacer and is mounted on the screw rod 110. The two ends of the sleeve 141 respectively abut against the main nut 120 and the secondary nut 130. A second flange 122 is provided on the end surface of the main nut 120. A second recess 132 is provided on the end surface of the secondary nut 130. A second recess 142 is provided at one end of the sleeve 141, and a second flange 143 is provided at the other end. The second recess 142 on the sleeve 141 accommodates the second flange 122 on the main nut 120. The second recess 132 on the secondary nut 130 accommodates the second flange 143 on the sleeve 141.

[0042] Example 5

[0043] The fastener 100 includes a screw 110, a main nut 120 and a secondary nut 130. The screw 110 includes a main screw 111 and a secondary screw 112, wherein the main screw 111 is provided with a first thread 113, and the secondary screw 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 111 is M30, and the pitch of the first thread 113 is 3.5 mm. The diameter specification of the secondary screw 111 is M22, and the pitch of the second thread 114 is 2.5 mm. One end of the main screw 111 is directly connected to the secondary screw 112, and the other end of the main screw 111 is provided with a head 115. The main nut 120 is threadedly matched with the main screw 111. The secondary nut 130 is threadedly matched with the secondary screw 112. The aperture of the main nut 120 is smaller than the outer diameter of the secondary nut 130. A gasket 142 is provided between the main nut 120 and the secondary nut 130. The gasket 142 is a spacer, and the number is three, and it is sleeved on the screw rod 110. The gasket 142 is clamped by the main nut 120 and the secondary 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]

[0048] 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 present invention 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.

[0049] In the fastener of the present invention, 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, increasing the friction between the secondary nut and the secondary screw, 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 present invention, since the main nut presses against the secondary nut in the axial direction, the friction between the secondary nut and the secondary screw is increased, although the main nut and the secondary nut have friction in the circumferential direction when they are in 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 the number of spacers is multiple, the friction in the circumferential direction transmitted from the main nut to the secondary nut can be further reduced.

[0050] 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 substitutes 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: include: A screw, the screw comprising a main screw and a secondary screw, the main screw being provided with a first thread, the secondary screw being provided with a second thread, the pitch of the first thread being greater than the pitch of the second thread; the main screw being connected to the secondary screw; A main nut, the main nut being threadably matched with the main screw; A secondary nut, the secondary nut is threadably matched with the secondary screw; The secondary nut is located outside the main nut.

2. The fastener according to claim 1, characterized in that The end surface of one of the main nut or the auxiliary nut is provided with a first flange, and the end surface of the other is provided with a first recess; the first recess is used to accommodate the first flange.

3. The fastener according to claim 1, characterized in that A spacer is arranged between the main nut and the auxiliary nut, and the spacer is sleeved on the screw rod.

4. The fastener according to claim 3, characterized in that The end face of the spacer is provided with a second flange; the end face of the main nut and / or the secondary 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 secondary nut is provided with a second flange, and the second recess is used to accommodate the second flange.

5. The fastener according to claim 3, characterized in that: The number of the spacers is two or more.

6. The fastener according to claim 3, characterized in that The spacer is a sleeve or a gasket.

7. The fastener according to claim 1, characterized in that The hole diameter of the main nut is smaller than the outer diameter of the secondary 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, characterized in that The pitch of the first thread is greater than the pitch of the second thread by more than 20%.

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, characterized in that The diameter of the main screw is greater than the diameter of the secondary 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 secondary 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.

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