A double nut locking assembly

Abstract

A double-nut locking assembly belongs to the field of fastener technology. The left-low, right-high meshing teeth on the lower surface of the elastic washer mesh with the mating teeth on the top of the bottom nut. This direction aims to prevent the entire assembly from loosening clockwise relative to the connected component below. The fixing teeth at the bottom of the clamping nut press against the upper surface of the elastic washer, preventing the clamping nut itself from loosening counterclockwise relative to the elastic washer. Through the meshing of the upper and lower layers of serrated teeth in different directions, bidirectional mechanical locking is achieved, effectively resisting vibration from any direction. Its anti-loosening reliability far exceeds that of single-direction locking structures. The elastic washer itself has a wavy annular structure, generating continuous axial elastic force when compressed. The retaining plate at the opening of the elastic washer engages with the groove of the bottom nut. Combining the elastic compensation of the spring washer and the mechanical locking advantages of the serrated washer, the retaining plate structure prevents the elastic washer from slipping and failing, achieving continuous anti-loosening under vibration.

Description

Technical Field

[0001] This utility model belongs to the field of fastener technology, specifically relating to a double-nut locking assembly. Background Technology

[0002] Threaded connections, especially the fit between nuts and bolts, are one of the most basic and widely used connection methods in mechanical assembly. However, under harsh working conditions such as vibration, impact, load variations, and corrosive environments, traditional threaded fasteners have revealed several long-standing technical problems that have not been effectively solved:

[0003] Ordinary nuts mainly rely on the friction between the threads to prevent loosening. Under long-term vibration, they are prone to creep and loosening. Although single-function anti-loosening elements such as spring washers and toothed washers are widely used, their anti-loosening effect is limited. Spring washers are prone to losing elasticity when the preload is too high, while toothed washers, although they can prevent loosening, may damage the contact surface. Moreover, neither of them can provide the dual protection of axial elasticity and radial reverse locking at the same time. Summary of the Invention

[0004] The present invention aims to solve the technical problems existing in the prior art and provide a double nut locking assembly.

[0005] The above-mentioned technical problems of this utility model are mainly solved by the following technical solution: a double nut locking assembly, including a bottom nut, an elastic washer and a clamping nut, wherein the elastic washer is disposed between the bottom nut and the clamping nut, the elastic washer is an open washer, the lower surface of the elastic washer is provided with a plurality of left-low and right-high biting teeth, the plurality of biting teeth are arranged in a central ring array, the elastic washer is generally wavy ring shape, including a plurality of symmetrically arranged undulating parts, one end of the opening on the lower surface of the elastic washer is provided with a retaining plate, the top of the bottom nut is provided with a mating tooth that cooperates with the biting teeth, and a retaining groove is provided on the surface, the retaining plate in the elastic washer is engaged in the retaining groove, and at the same time the biting teeth and the mating teeth bite each other, the bottom of the clamping nut is provided with a fixing tooth facing the opposite direction to the biting teeth.

[0006] Preferably, the bottom of the bottom nut is provided with a pressure ring larger than its own diameter.

[0007] Preferably, both the bottom nut and the clamping nut are made of stainless steel, and the elastic washer is made of aluminum alloy.

[0008] Preferably, the mating teeth and the bottom nut are an integral structure.

[0009] Preferably, the fixing teeth and the clamping nut are an integral structure.

[0010] The beneficial effects of this invention are as follows: the left-low, right-high meshing teeth on the lower surface of the elastic washer mesh with the mating teeth on the top of the bottom nut. This direction aims to prevent the entire assembly from loosening clockwise relative to the connected part below. The fixing teeth at the bottom of the clamping nut press against the upper surface of the elastic washer, which aims to prevent the clamping nut itself from loosening counterclockwise relative to the elastic washer. Through the meshing of the upper and lower layers of serrated teeth in different directions, bidirectional mechanical locking is achieved, which can effectively resist vibrations from any direction. The anti-loosening reliability is far superior to that of a single-direction locking structure.

[0011] The elastic washer itself has a wavy ring structure. When it is tightened by the nut, it generates a continuous axial elastic force, like a spring washer, to compensate for the decrease in preload caused by vibration. The retaining plate at the opening of the elastic washer cooperates with the groove of the bottom nut, and will not rotate circumferentially relative to the bottom nut. It combines the elastic compensation of the spring washer and the mechanical locking advantage of the serrated washer. The retaining plate structure prevents the elastic washer from slipping and failing, and achieves continuous anti-loosening under dynamic vibration. Attached Figure Description

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

[0013] Figure 2 This is a schematic diagram of a structure for fixing teeth according to this utility model;

[0014] Figure 3 This is a schematic diagram of the structure of an elastic gasket according to this utility model;

[0015] Figure 4 This is a schematic diagram of a nail head forming mechanism of this utility model.

[0016] In the diagram: 1. Bottom nut; 2. Elastic washer; 3. Compression nut; 4. Engaging teeth; 5. Rippled part; 6. Clamping plate; 7. Mating teeth; 8. Clamping slot; 9. Fixing teeth; 10. Pressure ring. Detailed Implementation

[0017] The technical solution of this utility model will be further described in detail below through embodiments and in conjunction with the accompanying drawings.

[0018] Example: A double-nut locking assembly, such as Figures 1-4As shown, it includes a bottom nut, an elastic washer, and a clamping nut. The elastic washer is located between the bottom nut and the clamping nut. The elastic washer is an open washer. The lower surface of the elastic washer has multiple cleaving teeth that are lower on the left and higher on the right. The multiple cleaving teeth are arranged in a central ring array. The elastic washer is wavy and ring-shaped, including multiple symmetrically arranged undulating parts. One end of the opening on the lower surface of the elastic washer has a retaining plate. The top of the bottom nut has a mating tooth that mates with the cleaving teeth, and a groove is formed on its surface. The retaining plate in the elastic washer is locked in the groove. At the same time, the cleaving teeth and the mating teeth bite each other. The bottom of the clamping nut has a fixing tooth that faces the opposite direction to the cleaving teeth.

[0019] The bottom of the bottom nut has a pressure ring larger than its own diameter; both the bottom nut and the clamping nut are made of stainless steel, and the elastic washer is made of aluminum alloy; the mating teeth and the bottom nut are an integral structure; the fixing teeth and the clamping nut are an integral structure.

[0020] The principle of this utility model:

[0021] First locking mechanism (lower layer): The left-lower-right-higher meshing teeth on the lower surface of the elastic washer engage with the mating teeth on the top of the bottom nut. This orientation is designed to prevent the entire assembly from loosening clockwise relative to the connected component below.

[0022] Second locking (upper layer): The retaining teeth at the bottom of the clamping nut (directed opposite to the engaging teeth) press against the upper surface of the elastic washer. This direction is designed to prevent the clamping nut itself from loosening counterclockwise relative to the elastic washer;

[0023] By using serrated teeth in two different directions on the upper and lower layers, bidirectional mechanical locking is achieved, which can effectively resist vibrations from any direction and has a much higher reliability in preventing loosening than a single-direction locking structure.

[0024] The elastic gasket itself has a wavy ring structure. When it is tightened by the nut, it will generate a continuous axial elastic force, just like a spring washer, to compensate for the decrease in preload caused by vibration.

[0025] The retaining plate at the opening of the elastic washer engages with the groove of the bottom nut. This design ensures that the elastic washer can only move within the range of wave deformation when under force, and will not rotate circumferentially relative to the bottom nut, thus ensuring that it is always in the optimal working position and can be reset in time.

[0026] It combines the elastic compensation of spring washers with the mechanical locking advantages of serrated washers, and avoids slippage and failure of elastic washers through a clamping plate structure, thus achieving continuous anti-loosening under dynamic vibration.

[0027] Finally, it should be noted that the above embodiments are merely representative examples of this utility model. Obviously, this utility model is not limited to the above embodiments and can have many variations. Any simple modifications, equivalent changes, and alterations made to the above embodiments based on the technical essence of this utility model should be considered to fall within the protection scope of this utility model.

Claims

1. A double-nut locking assembly, comprising a bottom nut, an elastic washer, and a clamping nut, characterized in that: The elastic washer is disposed between the bottom nut and the clamping nut. The elastic washer is an open washer. The lower surface of the elastic washer has multiple bite teeth that are lower on the left and higher on the right. The multiple bite teeth are arranged in a central ring array. The elastic washer is wavy and ring-shaped, including multiple symmetrically arranged undulating parts. One end of the opening on the lower surface of the elastic washer is provided with a retaining plate. The top of the bottom nut has a mating tooth that mates with the bite teeth, and a groove is provided on its surface. The retaining plate in the elastic washer is locked in the groove. At the same time, the bite teeth and the mating teeth bite each other. The bottom of the clamping nut has a fixing tooth that faces the opposite direction to the bite teeth.

2. The double-nut locking assembly according to claim 1, characterized in that: The bottom of the nut has a pressure ring larger than its own diameter.

3. The double-nut locking assembly according to claim 1, characterized in that: Both the bottom nut and the clamping nut are made of stainless steel, and the elastic washer is made of aluminum alloy.

4. The double-nut locking assembly according to claim 1, characterized in that: The mating teeth and the bottom nut are an integral structure.

5. A double-nut locking assembly according to claim 1, characterized in that: The fixing teeth and the clamping nut are an integral structure.

Images