Anti-backout bolt assembly

Abstract

The utility model discloses a kind of anti-loose bolt assemblies, including bolt body, the sealing ring of sleeve bolt body, the nut of cooperation bolt body threaded connection, the gasket is also threaded connected on the bolt body, the gasket is located between sealing ring and the bolt cap of bolt body, the bolt cap of the bolt body is provided with anti-rotation tooth on the face of gasket, and the hardness of the gasket is less than anti-rotation tooth, to supply anti-rotation tooth embeds gasket. Can still guarantee better anti-loose effect under the scene of existing rubber sealing ring, alleviate the risk of bolt loosening after long-term use.

Description

Technical Field

[0001] This utility model relates to fasteners, specifically anti-loosening bolt assemblies. Background Technology

[0002] After installation, bolts need to be protected from loosening under vibration. Common bolt anti-loosening methods mainly rely on anti-rotation teeth on the bolt cap. After the bolt is tightened, the anti-rotation function is achieved through the contact between the anti-rotation teeth and the contact surface. However, in some applications, a rubber sealing ring is required between the bolt and the contact surface. In this case, the presence of the rubber sealing ring makes it difficult for the anti-rotation teeth of the bolt to make contact with the contact surface, thus causing the anti-rotation effect to fail. Although the rubber sealing ring can provide some rotation damping, there is still a risk of bolt loosening under long-term use. Utility Model Content

[0003] In view of the shortcomings of the existing technology, the purpose of this utility model is to provide an anti-loosening bolt assembly that can still ensure a good anti-loosening effect in the presence of rubber sealing rings, and alleviate the risk of bolt loosening after long-term use.

[0004] To achieve the above objectives, this utility model provides the following technical solution: an anti-loosening bolt assembly, comprising a bolt body, a sealing ring sleeved on the bolt body, and a nut threadedly connected to the bolt body. A washer is also threadedly connected to the bolt body. The washer is located between the sealing ring and the bolt cap of the bolt body. Anti-rotation teeth are provided on the surface of the bolt cap of the bolt body corresponding to the washer, and the hardness of the washer is less than that of the anti-rotation teeth so that the anti-rotation teeth can be embedded in the washer.

[0005] As a further improvement of this utility model, the gasket is made of plastic.

[0006] As a further improvement of this utility model, the tip of the anti-rotation tooth is inclined toward the tightening direction of the bolt body.

[0007] As a further improvement of this utility model, the gasket has a number of protrusions on the side corresponding to the anti-rotation teeth, and the protrusions are distributed along the circumference of the gasket.

[0008] As a further improvement of this utility model, several of the protrusions are radially distributed on the gasket.

[0009] As a further improvement of this utility model, the gasket is circular, and the length extension direction of the protrusion passes through the center of the gasket.

[0010] As a further improvement of this utility model, the length extension direction of several of the protrusions is tangent to a circular trajectory.

[0011] As a further improvement of this utility model, the end face of the protrusion corresponding to the anti-rotation tooth is inclined, and the outer side is higher than the inner side; the gasket deforms toward the sealing ring after contacting the plug cap through the protrusion.

[0012] The beneficial effects of this utility model are as follows: By threading a washer onto the bolt body and placing the washer between the sealing ring and the bolt cap, and simultaneously providing anti-rotation teeth on the surface of the bolt cap corresponding to the washer, and making the hardness of the washer less than that of the anti-rotation teeth, the anti-rotation teeth can be embedded in the washer during the tightening of the bolt body. This effectively avoids the problem of the anti-rotation teeth not being able to contact the contact surface due to the obstruction of the rubber sealing ring, thereby improving the anti-loosening effect of the bolt under vibration and alleviating the risk of bolt loosening after long-term use. In addition, the threaded connection between the washer and the bolt body can improve the positional stability of the washer during installation and use, and can form a more stable locking effect with the nut, making the washer less likely to loosen under vibration, further improving the overall reliability of the anti-loosening structure and ensuring the continuous effectiveness of the anti-loosening function. Attached Figure Description

[0013] Figure 1 This is a three-dimensional schematic diagram of the overall structure of this utility model; Figure 2 This is a front view schematic diagram of the overall structure of this utility model; Figure 3 This is a schematic diagram of the raised surface structure of the washer of this utility model; Figure 4 This is a schematic diagram of the raised surface structure of another embodiment of the gasket of this utility model; Figure 5 This is a schematic diagram of the anti-rotation teeth of the bolt body of this utility model; Figure 6 This is a side view of the gasket of this utility model; Figure 7 for Figure 6 Enlarged view of part A in the image.

[0014] Reference numerals: 1. Bolt body; 2. Sealing ring; 3. Nut; 4. Washer; 5. Anti-rotation teeth; 6. Protrusion. Detailed Implementation

[0015] The present invention will now be described in further detail with reference to the embodiments shown in the accompanying drawings.

[0016] Reference Figure 1-7As shown, this embodiment provides an anti-loosening bolt assembly, including a bolt body 1, a sealing ring 2 sleeved on the bolt body 1, and a nut 3 threadedly connected to the bolt body 1. A washer 4 is also threadedly connected to the bolt body 1. The washer 4 is located between the sealing ring 2 and the bolt cap of the bolt body 1. The bolt cap of the bolt body 1 is provided with anti-rotation teeth 5 on the surface corresponding to the washer 4. The hardness of the washer 4 is less than that of the anti-rotation teeth 5 so that the anti-rotation teeth 5 can be embedded in the washer 4.

[0017] The outer circumferential surface of the bolt body 1 is provided with external threads, and the inner circumferential surface of the nut 3 is provided with internal threads that are compatible with the external threads of the bolt body 1. The nut 3 is threadedly fitted onto the bolt body 1. The sealing ring 2 is an annular structure, and its inner diameter is compatible with the outer diameter of the bolt body 1. The sealing ring 2 is fitted onto the threaded portion of the bolt body 1 and is located between the washer 4 and the connected part to be fixed. The inner circumferential surface of the washer 4 is provided with internal threads that are compatible with the external threads of the bolt body 1. The washer 4 is threadedly fitted onto the bolt body 1 and is located on the side of the sealing ring 2 away from the connected part and on the side of the bolt cap close to the sealing ring 2. Anti-rotation teeth 5 are provided on the end face of the bolt cap facing the washer 4. The anti-rotation teeth 5 can be integrally formed with the bolt cap and fixed on the bolt cap. The number of anti-rotation teeth 5 can be set to multiple according to the actual anti-loosening requirements and is evenly distributed along the circumference of the bolt cap. The hardness of the washer 4 is less than that of the anti-rotation teeth 5. For example, the anti-rotation teeth 5 are made of metal (such as steel or iron), and the washer 4 is made of a material with a lower hardness than metal. (e.g., plastic) Before use, rotate the washer 4 to fit the bolt cap. When tightening the bolt body 1, the operator rotates the bolt cap with a tool, causing the bolt body 1 to move the washer 4 towards the sealing ring 2. The nut 3 moves towards the connected part under the action of the bolt body 1's thread until the nut 3 presses against the connected part, the sealing ring 2 is squeezed and deformed, and pushes the washer 4 further towards the bolt cap. At this time, the anti-rotation teeth 5 on the bolt cap are embedded in the washer 4 under pressure. The anti-rotation teeth 5 and the washer 4 form a mechanical interlocking structure, which restricts the reverse rotation of the bolt body 1. At the same time, the washer 4 and the bolt provide axial force to each other, which increases the friction between the two and the thread of the bolt body 1, thereby improving the anti-loosening effect. Even in a vibration environment, this interlocking structure can provide stable anti-rotation resistance for the bolt body 1. Compared with the traditional method that only relies on the sealing ring 2 for damping, it can more effectively improve the anti-loosening effect of the bolt and alleviate the risk of bolt loosening after long-term use.

[0018] To facilitate the selection of a suitable washer 4 material to ensure that the anti-rotation tooth 5 is smoothly inserted, in one alternative, the washer 4 of the aforementioned anti-loosening bolt assembly is made of plastic.

[0019] The gasket 4 is made of plastic. The hardness of the plastic material is easy to control to be lower than that of the anti-rotation tooth 5, and it has a certain degree of plasticity and deformation capacity. When the cap drives the anti-rotation tooth 5 to apply pressure to the gasket 4, the plastic gasket 4 can undergo moderate deformation under the pressure of the anti-rotation tooth 5, so that the anti-rotation tooth 5 is stably embedded in the gasket 4. At the same time, the plastic material will not cause wear to the anti-rotation tooth 5, ensuring the structural integrity of the anti-rotation tooth 5. In addition, the processing cost of the plastic gasket 4 is low and its weight is light. Under the premise of ensuring the anti-detachment function, the overall cost and weight of the component can be reduced.

[0020] Specifically, further optimization can be achieved by choosing the following method: the tip of the anti-rotation tooth 5 of the anti-loosening bolt assembly is inclined toward the loosening direction of the bolt body 1.

[0021] This inclined structural design, without affecting the ease of tightening the bolts, further improves the restriction effect on bolt loosening, making the anti-loosening structure more practical.

[0022] In some options, to enhance the contact stability and anti-rotation effect between the washer 4 and the bolt cap, the washer 4 of the above-mentioned anti-loosening bolt assembly is provided with a number of protrusions 6 on the side corresponding to the anti-rotation teeth 5, and the protrusions 6 are distributed along the circumference of the washer 4.

[0023] The end face of the washer 4 facing the bolt cap has several protrusions 6. The protrusions 6 and the washer 4 can be integrally formed. The shape of the protrusions 6 can be set as strip, block, etc., and all the protrusions 6 are evenly distributed along the circumference of the washer 4. When the bolt body 1 is tightened, when the bolt cap moves towards the washer 4, the anti-rotation teeth 5 on the bolt cap will first contact the protrusions 6 on the washer 4. After tightening, they will be embedded in the protrusions 6. The contact of the protrusions 6 makes it easier for the anti-rotation teeth 5 to form a fit with the washer 4. The problem of uneven fit of the anti-rotation teeth 5 due to the flat surface of the washer 4 will not occur. Moreover, the local pressure is higher, and the anti-rotation fit is more stable.

[0024] To make the positioning and guiding effect of the protrusions 6 on the anti-rotation teeth 5 more uniform, in an optional embodiment, refer to Figure 3 As shown, several protrusions 6 of the aforementioned anti-loosening bolt assembly are radially distributed on the gasket 4.

[0025] Several protrusions 6 are radially distributed on the end face of the washer 4 facing the bolt cap. That is, the extension direction of each protrusion 6 extends from the central area of ​​the washer 4 to the edge area of ​​the washer 4, and all protrusions 6 are arranged radially with the center of the washer 4 as the center. This distribution method is compatible with the radial structure of the bolt body 1. Since the anti-rotation teeth 5 are distributed along the circumference of the bolt cap, when the bolt body 1 rotates, no matter what the circumferential position of the anti-rotation teeth 5 is on the end face of the bolt cap, it can contact the corresponding radial protrusions 6, ensuring that the positioning and guiding effect of the protrusions 6 on each anti-rotation tooth 5 is uniform and consistent. At the same time, the radially distributed protrusions 6 can make the force on the washer 4 more uniform. When the anti-rotation teeth 5 are embedded in the washer 4, the pressure on the area of ​​the washer 4 around each protrusion 6 is similar, avoiding cracks or damage to the washer 4 due to local stress concentration, and extending the service life of the washer 4.

[0026] To further clarify the structure of the radial protrusion 6, in one specific embodiment, the washer 4 of the anti-loosening bolt assembly is circular, and the length extension direction of the protrusion 6 passes through the center of the washer 4.

[0027] When the anti-rotation tooth 5 is embedded in the area of ​​the gasket 4 near the protrusion 6, the protrusion 6 can better withstand the radial pressure brought by the anti-rotation tooth 5, reducing the risk of deformation or breakage of the protrusion 6 due to improper force direction; the radially extending protrusion 6 can also enhance the radial stiffness of the gasket 4 and improve the contact stability between the gasket 4 and the plug cap and sealing ring 2.

[0028] In addition to a radial distribution, in some other options, refer to Figure 4 As shown, the length extension direction of several protrusions 6 of the aforementioned anti-loosening bolt assembly is tangent to a circular trajectory.

[0029] The center of the circular track coincides with the center of the gasket 4, and the diameter of the circular track can be designed to match the distribution radius of the anti-rotation teeth 5. This distribution method makes each protrusion 6 form a continuous blocking structure in the circumferential direction of the gasket 4. The resistance generated by this structure can more effectively counteract the rotational torque of the bolt body 1. Compared with the radial protrusions 6, it has a stronger effect on restricting bolt loosening.

[0030] To ensure better contact between the gasket 4 and the sealing ring 2 during installation and improve the sealing effect, an optimized solution is proposed, referring to... Figure 6 and 7 As shown, the protrusion 6 of the anti-loosening bolt assembly is inclined to the end face of the anti-rotation tooth 5, and the outer side is higher than the inner side; the gasket 4 deforms toward the sealing ring 2 after contacting the bolt cap through the protrusion 6.

[0031] The end face of the protrusion 6 facing the anti-rotation tooth 5 is an inclined surface. The side of this inclined surface near the edge of the gasket 4 (the outer side) is higher than the side near the inner hole of the gasket 4 (the inner side). The inclination angle of the inclined surface can be designed according to the deformation requirements of the gasket 4. When the bolt body 1 is tightened, the bolt cap moves towards the gasket 4. The anti-rotation tooth 5 first contacts the inclined surface of the protrusion 6. As the bolt cap continues to press down, the anti-rotation tooth 5 applies downward pressure to the inclined surface of the protrusion 6. This pressure can be decomposed into a radial outward component along the gasket 4 and an axial component along the direction of the bolt towards the sealing ring 2. The axial component pushes the gasket 4 to deform towards the sealing ring 2, causing the gasket 4 to deform. The lower surface (facing the sealing ring 2) of the gasket 4 is in close contact with the sealing ring 2, reducing the gap between the gasket 4 and the sealing ring 2, and creating an enveloping effect from the outside to the inside, thereby enhancing the sealing performance of the component. At the same time, the inclined end face can reduce the resistance during the insertion of the anti-rotation tooth 5, creating a gradually increasing resistance effect, which facilitates the formation of a fit. In addition, the deformation of the gasket 4 towards the sealing ring 2 can also increase the friction between the gasket 4 and the sealing ring 2, as well as the friction between the gasket 4 and the thread between the bolt. This friction can further limit the rotation of the bolt body 1 and the loosening of the gasket 4, achieving a dual optimization of sealing and anti-loosening functions.

[0032] The above description is merely a preferred embodiment of this utility model. The protection scope of this utility model is not limited to the above embodiments. All technical solutions falling within the scope of this utility model's concept are protected. It should be noted that for those skilled in the art, any improvements and modifications made without departing from the principle of this utility model should also be considered within the protection scope of this utility model.

Claims

1. A bolt anti-loosening assembly, comprising a bolt body, a sealing ring sleeved on the bolt body, and a nut threadedly connected to the bolt body, characterized in that, A washer is also threaded onto the bolt body. The washer is located between the sealing ring and the bolt head of the bolt body. Anti-rotation teeth are provided on the surface of the bolt head corresponding to the washer. The hardness of the washer is less than that of the anti-rotation teeth so that the anti-rotation teeth can be embedded in the washer.

2. The anti-backout bolt assembly of claim 1, wherein, The gasket is made of plastic.

3. A captive bolt assembly according to claim 1 or 2, wherein, The tip of the anti-rotation tooth is inclined toward the direction of loosening of the bolt body.

4. The anti-backout bolt assembly of claim 2, wherein, The gasket has several protrusions on the side corresponding to the anti-rotation teeth, and the protrusions are distributed along the circumference of the gasket.

5. The anti-backout bolt assembly of claim 4, wherein, Several of the protrusions are distributed radially on the gasket.

6. The anti-backout bolt assembly of claim 5, wherein, The gasket is circular, and the length of the protrusion extends through the center of the gasket.

7. The anti-backout bolt assembly of claim 5, wherein, The length extension direction of several of the protrusions is tangent to a circular trajectory.

8. The anti-backout bolt assembly of claim 4, wherein, The protrusion is inclined to the end face of the anti-rotation tooth, and the outer side is higher than the inner side; the gasket deforms toward the sealing ring after contacting the plug cap through the protrusion.

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