Sound-proof high-temperature-resistant waterproof screw

Abstract

A fixing boss is arranged on the middle section of a rod body, the fixing boss extends outwards in the radial direction, and the fixing boss, the lower end face of a head and the outer wall of the rod body between the fixing boss and the head form a fixing groove used for connecting / limiting an opponent piece. The elastic layer covers the surface of the fixing groove; the edge of the lower end of the elastic layer extends downwards to form a sealing assembly capable of surrounding and separating the space inside and outside the threaded hole. The elastic layer is arranged on the surface of the fixing groove between the fixing boss and the head, so that a vibration propagation path is blocked, and the effects of reducing noise and resisting high temperature are achieved; a sealing structure is arranged on the lower edge of the fixing boss to separate the space inside and outside the threaded hole, and the waterproof and sound insulation effects are achieved.

Description

Technical Field

[0001] This utility model relates to fasteners for connecting mechanical parts, specifically a sound-insulating, high-temperature resistant, and waterproof screw. Background Technology

[0002] Screws are common mechanical fasteners. Screws used in outdoor environments are required to be waterproof; in the automotive manufacturing industry, some are also required to have sound insulation properties. Existing waterproof screws generally use T-shaped screws, which rely on waterproof foam pads for waterproofing. However, foam cannot provide sound insulation or noise reduction; furthermore, T-shaped screws require additional double-sided adhesive foam for waterproofing, resulting in low assembly efficiency. Summary of the Invention

[0003] This invention aims to solve existing problems by providing a sound-insulating, high-temperature resistant, and waterproof screw.

[0004] To achieve the above objectives, the technical solution adopted by this utility model includes a rod body with a head at the upper end and threads on the lower side wall for connecting the opponent (bracket) to the body part (vehicle sheet metal). It also includes a fixing boss and an elastic layer. The fixing boss is located in the middle section of the rod body, extends radially outward, and forms a fixing groove for connecting / limiting the opponent with the lower end face of the head and the outer wall of the rod body between them. The elastic layer covers the surface of the fixing groove; the lower edge of the elastic layer also extends downward, forming a sealing assembly that surrounds and isolates the space inside and outside the threaded hole.

[0005] In use, the rod passes through the hole of the counterscrew and is screwed into the threaded hole of the main body. The elastic layer on the surface of the fixing groove contacts the hole. The lower end face of the fixing boss contacts the surface of the main body and presses the sealing assembly onto the main body to form a sealing structure.

[0006] The elastic layer also covers the sidewalls of the head.

[0007] The fixed boss is circular, and the sealing component extending from the elastic layer forms a ring-shaped sealing structure. The lower edge of the elastic layer extends in an inclined outward direction.

[0008] The head is square or polygonal and extends outward radially.

[0009] The fixing groove is an annular groove that surrounds the side wall of the rod.

[0010] The elastic layer is EPDM rubber.

[0011] Compared with the prior art, this utility model provides an elastic layer on the surface of the fixing groove between the fixing boss and the head to block the vibration transmission path, thereby reducing noise and resisting high temperature; the fixing boss fits snugly with the body to reduce torque decay; and a sealing structure is provided at the lower edge of the fixing boss to isolate the space inside and outside the threaded hole, thereby achieving waterproof and soundproof effects. Attached Figure Description

[0012] Figure 1 This is a schematic diagram of the structure of an embodiment of the present utility model;

[0013] Figure 2 This is a schematic diagram of the structure of an embodiment of the present utility model;

[0014] Figure 3 This is a cross-sectional view of an embodiment of the present utility model;

[0015] Figure 4 This is a schematic diagram illustrating the usage state of an embodiment of the present utility model;

[0016] See attached diagram: 1. Head, 2. Thread, 3. Rod, 4. Fixing boss, 5. Elastic layer, 6. Sealing assembly, 7. Sheet metal, 8. Bracket. Detailed Implementation

[0017] The present invention will now be further described with reference to the accompanying drawings. For ease of description, the direction of the screw head is referred to as "up" and the direction of the thread as "down".

[0018] See Figures 1 to 3 , Figures 1 to 3 This invention demonstrates an embodiment of a sound-insulating, high-temperature resistant, and waterproof screw. The screw body used in this embodiment is a T-shaped screw, mainly comprising a shank, a head at the upper end of the shank, and threads distributed axially on the lower side wall of the shank for connecting an accessory (such as a bracket) to a body component (such as a car body sheet metal).

[0019] See Figure 1 It also includes a fixed boss and an elastic layer. The fixed boss is located in the middle section of the rod, between the head and the thread. Preferably, the elastic layer is made of EPDM rubber, which is vulcanized on the outer ring of the metal screw body during manufacturing; EPDM rubber has good corrosion resistance, heat resistance, and water resistance.

[0020] See Figure 1 and Figure 2The structure of the fixed boss extends radially outward from the side wall of the rod, forming a fixing groove with the head and the outer wall of the rod for connecting / limiting the clamp. Specifically, the bottom surface of the limiting groove is the side wall of the rod between the head and the fixed boss, and the two sides of the groove are the upper end face of the fixed boss and the lower end face of the head, respectively, forming an annular groove surrounding the side wall of the rod. After installation, the opening structure of the clamp contacts and is limited by the limiting groove, so the vibration of the clamp starts from the limiting groove and propagates along the rod to the main body.

[0021] See Figure 3 The elastic layer covers the entire surface of the fixing groove, including the sidewalls and lower end face of the head, the sidewalls of the rod between the head and the fixing boss, and the upper end face and sidewalls of the fixing boss. This completely covers the area where the fixing groove may come into contact with the structure at the opening of the fitting. After installation, an elastic layer is placed between the opening structure of the fitting and the screw body, which can block the vibration transmission path and play a role in noise reduction and high-temperature resistance.

[0022] Further, see Figure 3 The lower edge of the elastic layer extends downwards. See also Figure 2 In this embodiment, the surface of the fixed boss is circular. The structure of the elastic layer covering its edge is also circular, and the sealing component extending obliquely downward from the elastic layer forms a ring-shaped sealing structure.

[0023] When the fixed boss is in contact with the surface of the body component, the friction between the lower end face and the body component buffers the torque between the fixed boss and the body component, reducing torque decay. At the same time, the sealing ring structure contacts the surface of the body component along with the fixed boss. After being deformed under pressure, it fits around and surrounds the threaded hole, cutting off the air between the inner and outer spaces of the threaded hole, thus achieving waterproofing and sound insulation.

[0024] See Figure 4 In the aforementioned embodiment, when the bracket for the exterior roof trim of an automobile is fixed to the vehicle body (sheet metal), the rod passes through the hole in the bracket, and the lower end of the rod is screwed into the threaded hole in the sheet metal of the vehicle body. The elastic layer of EPDM rubber material distributed on both sides of the fixing groove contacts the hole and the inner and outer wall structures of the hole. The properties of the elastic layer material block the transmission of vibration, preventing most vibrations from reaching the rod and the sheet metal. Meanwhile, the lower end face of the fixing boss contacts the surface of the main body and generates friction, while simultaneously pressing the sealing component onto the main body to form a sealing structure, which also has the functions of reducing torque fade and waterproofing.

[0025] The embodiments of this utility model have been described above with reference to the accompanying drawings and examples. The structures given in the embodiments do not constitute a limitation on this utility model. Those skilled in the art can make adjustments as needed, and various modifications or variations within the scope of the appended claims are all within the scope of protection.

Claims

1. A sound-insulating, high-temperature resistant, and waterproof screw, comprising a shank, a head at the upper end of the shank, and threads on the lower end sidewall of the shank, characterized in that: It also includes a fixed boss and an elastic layer. The fixed boss is located in the middle section of the rod and extends radially outward. It forms a fixing groove for connecting / limiting the opponent with the lower end face of the head and the outer wall of the rod between them. The elastic layer covers the surface of the fixing groove; the lower edge of the elastic layer extends downward to form a sealing component that can surround and isolate the space inside and outside the threaded hole.

2. The sound-insulating, high-temperature resistant, and waterproof screw according to claim 1, characterized in that: The elastic layer also covers the sidewalls of the head.

3. The sound-insulating, high-temperature resistant, and waterproof screw according to claim 1, characterized in that: The fixed boss is circular, and the sealing component extending from the elastic layer forms a ring-shaped sealing structure.

4. The sound-insulating, high-temperature resistant, and waterproof screw according to claim 3, characterized in that: The lower edge of the elastic layer extends in an inclined outward direction.

5. The sound-insulating, high-temperature resistant, and waterproof screw according to claim 1, characterized in that: The head is square or polygonal and extends outward radially.

6. The sound-insulating, high-temperature resistant, and waterproof screw according to claim 1 or 4, characterized in that: The fixing groove is an annular groove that surrounds the side wall of the rod.

7. The sound-insulating, high-temperature resistant, and waterproof screw according to any one of claims 1-5, characterized in that: The elastic layer is EPDM rubber.

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