Lock bolt beneficial to improving waterproof capability

Abstract

The invention discloses a lock bolt beneficial to improving the waterproof capability. The lock bolt comprises a screw rod, a clamping plate and a waterproof liner, the waterproof liner comprises a body and a first waterproof strip. The first waterproof strip comprises a connecting end, a contact face, a binding face and a stretching face. The contact surface is an annular plane, and the contact surface is parallel to the plane where the body is located or the surface of an installed part. The binding face and the body are arranged in an inclined mode, and the included angle between the binding face and the body is alpha. And the alpha angle is an obtuse angle, and the size of the alpha angle is based on the condition that the contact surface and the binding surface form a plane when the screw rod is screwed into the mounting hole of the mounted part. When the first waterproof strip is clamped between the surface of an installed part and the body, the attaching face and the contact face are tightly attached to the surface of the part. The check bolt can achieve higher waterproof performance on the premise that the area is not increased.

Description

Technical Field

[0001] This invention relates to the field of fastener technology, and in particular to an anti-loosening bolt that improves waterproofing capabilities. Background Technology

[0002] In automobile manufacturing, a wide variety of fasteners are used. These fasteners are used to connect or clamp two or more components together, such as fixing curtain airbags, interior trim, and headliners to the vehicle frame. Different components or different locations require different fasteners.

[0003] In the automotive assembly process, various working conditions need to be addressed. For example, in the assembly of door panels, there are many components inside the door, mainly including window regulator components, window retaining components, speaker components, electronic control components, handle components, etc. However, with the development of the automotive industry, the thickness of the door itself is becoming increasingly smaller, resulting in a shrinking space within the door, specifically between the door panel and the interior trim panel. This necessitates precise assembly of the various components within the door, significantly reducing the margin for error and thus requiring very small fasteners. Another situation arises due to the structural design of the components themselves; for instance, assembling a channel-shaped component onto sheet metal also requires very small fasteners.

[0004] Meanwhile, the waterproofing requirements for assemblies such as the body door panels are also very high, and the installation position of the fasteners is precisely the key point for waterproofing. Therefore, the waterproofing capability of the designed fasteners becomes the top priority. Summary of the Invention

[0005] In view of this, the present invention provides an anti-loosening bolt that improves waterproofing capabilities to meet industrial needs.

[0006] An anti-loosening bolt that improves waterproofing includes a screw, a clamping plate mounted on the screw, and a waterproof gasket fitted onto the clamping plate or the screw. The waterproof gasket includes a body fitted onto the clamping plate and a first waterproof strip on one side of the body. The first waterproof strip includes a connecting end connected to the body, a contact surface at the free end of the first waterproof strip, a mating surface on one side of the first waterproof strip, and a tension surface on the other side of the first waterproof strip. The contact surface is an annular plane, parallel to the plane of the body or the surface of the component to be mounted. The mating surface is inclined to the body, and the angle between the mating surface and the body is angle α. An angle α is obtuse, and its size is such that when the screw is screwed into the mounting hole of the component to be mounted, the contact surface and the mating surface form a plane. The tension surface is inclined to the body, and the angle between the tension surface and the body is angle θ, which is an acute angle. When the first waterproof strip is sandwiched between the surface of the component being installed and the body, the mating surface and the contact surface are in close contact with the surface of the component.

[0007] Furthermore, the screw includes a platform, a nail head disposed at one end of the platform, and a threaded portion disposed at the other end of the platform, the nail head being located at one axial end of the platform, and the clamping plate being located at the other axial end of the platform.

[0008] Furthermore, the waterproof liner is applied to the clamping plate using a plastic coating process.

[0009] Furthermore, the waterproof gasket also includes a second waterproof strip disposed on the body and located on the same side as the first waterproof strip, wherein the second waterproof strip is closest to the screw than the first waterproof strip.

[0010] Furthermore, in a cross-section along the central axis of the screw, the outline of the second waterproof strip is arc-shaped.

[0011] Furthermore, as the screw is screwed into the mounting hole, the pressure exerted by the component on the first waterproof strip increases continuously, and the angle θ decreases, reaching 0° in the extreme state.

[0012] Furthermore, as the screw is screwed into the mounting hole, the pressure exerted by the component on the first waterproof strip increases, and the angle α increases, reaching 180° in the extreme state.

[0013] Furthermore, when the first waterproof strip is in a free state, the angle θ is greater than the supplementary angle of the angle α so that the stretching surface is not parallel to the bonding surface.

[0014] Furthermore, the thickness of the first waterproof strip at the connecting end is greater than the thickness at the free end, that is, greater than the thickness of the contact surface.

[0015] Furthermore, the clamping plate has an annular groove.

[0016] Compared with existing technologies, the anti-loosening bolt provided by this invention, which improves waterproofing capabilities, achieves higher waterproofing performance without increasing the area of ​​the waterproof gasket through its structural design. Specifically, the waterproof gasket has a first waterproof strip, which is an umbrella-shaped structure. When the screw is screwed into the mounting hole of the component, the surface or body of the component first contacts the contact surface. Under the tightening pressure, as the screw is continuously pressed down, the annular radius of the contact surface continuously increases, until the contact surface is almost on the same plane as the mating surface, thereby increasing the mating area and improving the waterproofing effect. At the same time, as the screw continues to be screwed in, the thickness of the connecting end causes greater elastic deformation due to compression, resulting in a stronger elastic reaction force. This ensures that the mating surface and the contact surface are tightly fitted to the surface of the component, preventing leakage and ensuring its sealing performance. Attached Figure Description

[0017] Figure 1 This invention provides a structural schematic diagram of an anti-loosening bolt that improves waterproofing capabilities.

[0018] Figure 2 for Figure 1 A schematic diagram of the cross-sectional structure of an anti-loosening bolt that improves waterproofing.

[0019] Figure 3 for Figure 1 A bottom view of the anchoring part of an anti-loosening bolt that improves waterproofing. Detailed Implementation

[0021] The following provides a more detailed description of specific embodiments of the present invention. It should be understood that the description of the embodiments of the present invention herein is not intended to limit the scope of protection of the present invention.

[0022] like Figures 1 to 3 The diagram shows a structural schematic of an anti-loosening bolt that improves waterproofing capabilities according to the present invention. The anti-loosening bolt includes a screw 10, a clamping plate 20 mounted on the screw 10, and a waterproof gasket 30 fitted onto the clamping plate 20 or the screw 10. It is conceivable that the anti-loosening bolt may include other functional structures, such as threads on the screw 10, guiding structures, etc., which are well-known to those skilled in the art and will not be described in detail here.

[0023] The screw 10 can be integrally formed from a cold-forged metal material and includes a step 11, a nail head 12 disposed at one end of the step 11, and a threaded portion 13 disposed at the other end of the step 11. The step 11 serves to separate the nail head 12 from the clamping plate 20. When assembling two components, one component has a mounting groove and the other component has a mounting hole. The step 11 is inserted into the mounting groove, and the threaded portion 13 is screwed into the mounting hole, thereby fixing the two components together. Therefore, the axial length of the step 11 can be set according to actual needs. The nail head 12 is usually a plate-shaped structure, which is set according to actual needs. In this embodiment, the nail head 12 is square, and the square shape of the nail head 12 also facilitates clamping with equipment such as pliers and screwing it into the mounting hole of the component. The threaded portion 13 can be screwed into the mounting hole to achieve the purpose of fixing the two components together.

[0024] The clamping plate 20 is fixedly disposed at one end of the stepped stage 11 of the screw 10, while the screw head 12 is normally located at the other end of the stepped stage 11, thus forming a gap. This gap can be engaged in the mounting groove of a component. The clamping plate 20 can be made of metal and can be pressed into the shank of the screw by interference fit. In this embodiment, the clamping plate 20 is a circular disc structure. To fix the waterproof gasket 30, the clamping plate 20 is stamped with an annular groove 21.

[0025] The waterproof gasket 30 can be fixed to the clamping plate 20 by a plastic coating process. It is conceivable that, if needed, the waterproof gasket 30 can also be simultaneously placed on the nail head 12. During the plastic coating process, the material used to prepare the waterproof gasket 30 is filled into the annular groove 21, thereby increasing the bonding strength between the waterproof gasket 30 and the clamping plate 20. Therefore, the waterproof gasket 30 should be made of a flexible material such as rubber or silicone. The waterproof gasket 30 includes a body 31 fitted onto the clamping plate 20, a first waterproof strip 32 disposed on the side of the body 31 facing away from the nail head 12, and a second waterproof strip 33 disposed on the body 31 with the first waterproof strip 32 on the same side. The first waterproof strip 32 is located radially outward of the body 31 and is an annular umbrella-shaped structure with a free end extending away from the nail head 12. In a cross section along the axial direction of the waterproof liner 30, the first waterproof strip 32 includes a connecting end 321 connected to the body 31, a contact surface 322 located on the free end of the first waterproof strip 32, an adhesive surface 323 disposed on one side of the first waterproof strip 32, and a stretching surface 324 disposed on the other side of the first waterproof strip 32.

[0026] The connecting end 321 is integrally formed with the body 31. The contact surface 322 is located on the side of the first waterproof strip 32 away from the body 31, and is an annular plane parallel to the surface of the clamping plate 20 or the surface of the component being mounted. When the screw 10 is screwed into the mounting hole, the contact surface 322 first contacts the surface of the component being mounted having the mounting hole.

[0027] The bonding surface 323 is located on the side of the body 31 near its central axis, and the bonding surface 323 is inclined to the body 31. The included angle between the bonding surface 323 and the body 31 is angle α, which is an obtuse angle. The angle will increase as the pressure applied by the component to the first waterproof strip 32 increases. In the extreme state, the angle α is 180°.

[0028] The stretching surface 324 is located on the side of the first waterproof strip 32 away from the central axis of the waterproof liner 30. The stretching surface 324 is also inclined to the body 31, and the angle between the stretching surface 324 and the body 31 is angle θ, which is an acute angle. This angle decreases as the pressure applied by the component to the first waterproof strip 32 increases, reaching a limit of 0°, meaning the stretching surface 324 completely overlaps with the surface of the body 31 or completely adheres to the surface of the component. It should be noted that when the first waterproof strip 32 is located on the radial edge of the body 31, the stretching surface adheres to the surface of the component. When the first waterproof strip 32 is located inside the body 31, the stretching surface adheres to the surface of the body 31. In the free state, angle θ is greater than the supplementary angle α, thus the stretching surface 324 is not parallel to the contact surface 323.

[0029] To achieve a fully sealed and waterproof effect during installation, the optimal fit surface 323 and contact surface 322 should form a single plane when pressed against the component. Therefore, the sizes of the β and θ angles need to be designed so that when the component presses against the first waterproof strip 32, the fit surface 323 and contact surface 322 can essentially form a single plane.

[0030] In the above structure, the supplementary angle of angle α is less than angle θ, that is, the thickness of the first waterproof strip 32 at the connecting end 321 is greater than the thickness of the free end, that is, greater than the thickness of the contact surface 322. As a result, the bonding surface 323 and the stretching surface 324 are two non-parallel planes. Therefore, in the axial section of the first waterproof strip 32, the length of the bonding surface 324 is greater than the length of the stretching surface 324.

[0031] During use, when the screw 10 is screwed into the mounting hole, the surface or body 31 of the component will first contact the contact surface 322. Under the tightening pressure, as the screw is continuously pressed down, the annular radius of the contact surface 232 continuously increases, and the distance from the contact surface 232 to the surface or body 31 of the component continuously decreases. Simultaneously, the angle θ continuously decreases. At this time, because the length of the mating surface 312 is greater than the length of the stretching surface 324, the stretching surface 324 is stretched and twisted towards the contact surface 322, thus ensuring that the contact surface 322 remains in contact with the surface of the component or body 31. As the screw 10 is continuously screwed in, the angle α continuously increases, and this angle α reaches its limit relative to the angle θ. When the angle α reaches its limit, the contact surface 322 and the mating surface 323 are on the same plane, and the mating surface 323 is in contact with the surface of the component or body 31. If the screw 10 continues to be screwed in, before the tension surface 324 is fully in contact with the surface of the body 31 or another component, the thickness of the connecting end 321 will cause greater elastic deformation due to compression, resulting in a stronger elastic reaction force. This ensures that the contact surface 323 and the contact surface 322 are tightly in contact with the surface of the component, preventing water leakage. Through the structural design of this first waterproof strip 32, its waterproof effect can be improved without increasing its contact area, making it suitable for use in confined spaces. After the screw 10 is fully screwed into the mounting hole, a nut can be screwed onto the threaded portion 13 of the screw 10. After fixing, because the surface of the component can be in contact with the clamp 20 to achieve a rigid connection (no loose connection), and under the elastic force of the second waterproof strip 33, the nut can remain in place for a longer period, thus achieving the purpose of preventing loosening.

[0032] The second waterproof strip 33 is located inside the first waterproof strip 32, meaning that the second waterproof strip 33 is closest to the screw 10 than the first waterproof strip 32. In a cross-section along the central axis of the screw 10, the outer contour of the second waterproof strip 32 is semi-circular. This semi-circular second waterproof strip 32 primarily serves to enhance waterproofing performance. When the first waterproof strip 32 abuts against the surface of the component, the second waterproof strip 32 should also abut against the surface of the component.

[0033] Compared with existing technologies, the anti-loosening bolt provided by this invention, which improves waterproofing capabilities, achieves higher waterproofing performance without increasing the area of ​​the waterproof gasket 30 through its structural design. Specifically, the waterproof gasket 30 has a first waterproof strip 32, which is an umbrella-shaped structure. When the screw 10 is screwed into the mounting hole of the component, the surface or body 31 of the component first contacts the contact surface 322. Under the tightening pressure, as the screw is continuously pressed down, the annular radius of the contact surface 232 continuously increases. Finally, the contact surface 232 is almost on the same plane as the mating surface 233, thereby increasing the mating area and improving the waterproofing effect. At the same time, as the screw 10 continues to be screwed in, the thickness of the connecting end 321 causes greater elastic deformation due to compression and has a stronger elastic reaction force, thereby ensuring that the mating surface 323 and the contact surface 322 are tightly fitted to the surface of the component, preventing leakage and ensuring its sealing performance.

[0034] The above are merely preferred embodiments of the present invention and are not intended to limit the scope of protection of the present invention. Any modifications, equivalent substitutions or improvements within the spirit of the present invention are covered within the scope of the claims of the present invention.

Claims

1. A lock bolt for facilitating an increase in waterproofing capability, characterized by: The anti-loosening bolt for improving waterproof performance comprises a screw rod, a clamping plate arranged on the screw rod, and a waterproof pad arranged on the clamping plate or the screw rod, wherein the waterproof pad comprises a body arranged on the clamping plate, and a first waterproof strip arranged on one side of the body, the first waterproof strip comprises a connecting end connected with the body, a contact surface located on a free end of the first waterproof strip, an abutting surface arranged on one side of the first waterproof strip, and a stretching surface arranged on the other side of the first waterproof strip, the contact surface is an annular plane, and the contact surface is parallel to a plane where the body is located or a surface of a mounted part, the abutting surface is arranged at an angle with the body, and the angle between the abutting surface and the body is an alpha angle, the alpha angle is an obtuse angle, and the size of the alpha angle is determined according to the condition that the contact surface and the abutting surface become a plane when the screw rod is screwed into a mounting hole of the mounted part, and the stretching surface is arranged at an angle with the body, and the angle between the stretching surface and the body is a theta angle, the theta angle is an acute angle, and the abutting surface and the contact surface are tightly attached to the surface of the mounted part when the first waterproof strip is clamped between the surface of the mounted part and the body.

2. The waterproofing bolt according to claim 1, wherein: The screw rod comprises a platform stage, a nail head arranged at one end of the platform stage, and a threaded part arranged at the other end of the platform stage, the nail head is located at one end of the platform stage in the axial direction, and the clamping plate is located at the other end of the platform stage in the axial direction.

3. The waterproofing bolt according to claim 1, wherein: The waterproof pad is arranged on the clamping plate by a plastic coating process.

4. The waterproofing bolt according to claim 1, wherein: The waterproof pad further comprises a second waterproof strip arranged on the body and located on the same side as the first waterproof strip, and the second waterproof strip is closer to the screw rod than the first waterproof strip.

5. The waterproofing bolt according to claim 4, wherein: the waterproofing bolt is provided with a waterproofing agent in the space between the bolt body and the bolt head. In a cross section along a central axis of the screw rod, a contour line of the second waterproof strip is arc-shaped.

6. The waterproofing bolt according to claim 1, wherein: When the screw rod is screwed into the mounting hole, the theta angle decreases as the pressure applied by the mounted part to the first waterproof strip increases, and the theta angle is 0° in the limit state.

7. The waterproofing bolt according to claim 1, wherein: When the screw rod is screwed into the mounting hole, the alpha angle increases as the pressure applied by the mounted part to the first waterproof strip increases, and the alpha angle is 180° in the limit state.

8. The waterproofing bolt according to claim 1, wherein: When the first waterproof strip is in a free state, the theta angle is greater than the supplementary angle of the alpha angle, so that the stretching surface is not parallel to the abutting surface.

9. The waterproofing bolt according to claim 1, wherein: The thickness of the first waterproof strip at the connecting end is greater than the thickness of the free end, i.e., the thickness of the contact surface.

10. The waterproofing bolt according to claim 1, wherein: The clamping plate has an annular groove.

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