Lock nut

Abstract

The application discloses a lock nut, which comprises a nut, a gasket, a locking piece, a plurality of limiting grooves and a plurality of insertion grooves. The locking piece is arranged between the nut and the gasket, the limiting grooves are arranged on one side of the gasket corresponding to the nut, the insertion grooves are arranged on the nut for inserting the locking piece, and the locking piece and the limiting grooves are matched to limit the circumferential rotation between the nut and the gasket. The lock nut can increase the anti-loosening effect.

Description

Technical Field

[0001] This invention relates to fasteners, specifically lock nuts. Background Technology

[0002] Nuts, as fasteners, are generally used in conjunction with bolts. In environments with high-frequency vibration, they are prone to loosening. Although adding shims can alleviate this problem to some extent, the solution is still not ideal. Summary of the Invention

[0003] In view of the shortcomings of the existing technology, the purpose of this invention is to provide an anti-loosening nut that can increase the anti-loosening effect.

[0004] To achieve the above objectives, the present invention provides the following technical solution: a lock nut, comprising a nut and a washer, wherein a locking element is provided between the nut and the washer, the washer having a plurality of limiting grooves on one side corresponding to the nut, the nut having a slot for inserting the locking element, and the nut and the washer being restricted from circumferential rotation by the cooperation of the locking element and the limiting grooves.

[0005] As a further improvement of the present invention, the locking member is inclined at least at one end extending out of the nut.

[0006] As a further improvement of the present invention, the locking member is tilted at an obtuse angle to the direction of rotational locking of the nut.

[0007] As a further improvement of the present invention, the locking member and the limiting groove are positioned at an angle to form a sharp corner.

[0008] As a further improvement of the present invention, the locking member is cylindrical, the slot is adapted to the locking member, and the slot is inclined so that the locking member is in an inclined state after being inserted.

[0009] As a further improvement of the present invention, the end of the nut corresponding to the washer is provided with an annular protrusion, which is adapted to the inner ring of the washer and is used to extend through the inner ring of the washer. When the nut is tightened with the bolt, the protrusion is turned outward by pressure and riveted to the washer.

[0010] As a further improvement of the present invention, the washer is provided with a plurality of protruding teeth on the other side of the nut.

[0011] As a further improvement of the present invention, the number of the limiting grooves is multiple, and they are distributed along the circumference of the gasket.

[0012] As a further improvement of the present invention, the number of locking elements is at least two, and they are distributed diagonally around the axis of the nut.

[0013] As a further improvement of the present invention, a spring is provided in the slot, and after the locking member is inserted into the slot, the spring is located between the locking member and the slot.

[0014] The beneficial effect of this invention is that by setting a locking element between the nut and the washer, and by using the locking element to cooperate with the limiting groove on the washer to restrict circumferential rotation, the problem of the nut being prone to loosening under vibration environment is improved, thereby increasing the reliability of the connection. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the riveting state of the nut and washer of the present invention. Figure 1 ; Figure 2 This is a schematic diagram of the riveting state of the nut and washer of the present invention. Figure 2 ; Figure 3 This is a schematic diagram of the nut structure of the present invention (with locking components assembled). Figure 4 This is a schematic diagram showing the mating positions of the gasket and locking element of the present invention; Figure 5 This is a schematic diagram of the nut structure of the present invention; Reference numerals: 1. Nut; 11. Slot; 12. Protrusion; 2. Washer; 21. Limiting groove; 22. Protruding tooth; 3. Locking element. Detailed Implementation

[0016] The present invention will now be described in further detail with reference to the embodiments shown in the accompanying drawings.

[0017] Reference Figure 1-5 As shown, an anti-loosening nut 1 in this embodiment includes a nut 1 and a washer 2. A locking member 3 is also provided between the nut 1 and the washer 2. The washer 2 has a plurality of limiting grooves 21 on one side corresponding to the nut 1. The nut 1 has a slot 11 for inserting the locking member 3. The nut 1 and the washer 2 are restricted from circumferential rotation by the cooperation of the locking member 3 and the limiting grooves 21.

[0018] After the nut 1 is tightened with the bolt, the washer 2 is located between the nut 1 and the fastened part. The locking member 3 is inserted into the slot 11 of the nut 1 and embedded in the limiting groove 21 of the washer 2, forming a circumferential limiting structure. When the nut 1 is subjected to vibration and tends to loosen, the locking member 3 abuts against the side wall of the limiting groove 21. Moreover, the presence of the locking member 3 can absorb a certain amount of vibration, restricting the circumferential rotation of the nut 1 relative to the washer 2, thereby alleviating the problem of the nut 1 loosening and improving the stability of the fastening connection. The locking member 3 and the slot 11 can adopt an interference fit or a clearance fit. This embodiment can solve the problem of the nut 1 easily rotating circumferentially after being fitted with the bolt in a vibrating working environment, leading to loosening of the connection.

[0019] In order to improve the limiting effect of the locking member 3 and the limiting groove 21, in one optional scheme, the locking member 3 is inclined at least at one end extending out of the nut 1.

[0020] The locking element 3 extends out of the nut 1 at an angle. When the nut 1 tends to loosen, the angled end forms a wedge-shaped contact with the side wall of the limiting groove 21, increasing the positive pressure on the contact surface and thus improving the limiting effect.

[0021] Further optimization can be achieved by tilting the locking element 3 at an obtuse angle to the direction of rotation and locking of the nut 1.

[0022] When nut 1 is subjected to a reverse rotational force that loosens it, the inclined end of locking member 3 locks against the side wall of limiting groove 21, thereby effectively restricting the reverse rotation of nut 1. This unidirectional limiting structure provides less resistance when tightening nut 1 and stronger limiting in the loosening direction, improving the user experience.

[0023] In some options, the locking element 3 and the limiting groove 21 are positioned at an angle to form a sharp corner.

[0024] The locking element 3 and the limiting groove 21 are positioned at an angle to form a sharp corner. The sharp corner can be embedded in the side wall or bottom of the limiting groove 21 to enhance the limiting effect and also help reduce the resistance when tightening the nut 1.

[0025] In order to facilitate the tilting setting of the locking member 3, in one optional scheme, the locking member 3 is cylindrical, the slot 11 is adapted to the locking member 3, and the slot 11 is tilted so that the locking member 3 can be tilted after being inserted.

[0026] The cylindrical locking element 3 is easy to process and standardized in production. The slot 11 is designed with an inclined structure. When the cylindrical locking element 3 is inserted, it naturally forms an inclined state, eliminating the need for inclined processing of the locking element 3 itself. This embodiment can solve the problems of high difficulty, high cost, and difficulty in ensuring consistency in the inclined processing of the locking element 3 during mass production.

[0027] To further improve the connection reliability between the nut 1 and the washer 2, in one optional scheme, the end of the nut 1 corresponding to the washer 2 is provided with an annular protrusion 12. The protrusion 12 is adapted to the inner ring of the washer 2 and is used to extend through the inner ring of the washer 2. When the nut 1 is tightened with the bolt, the protrusion 12 is folded outward by pressure and riveted to the washer 2.

[0028] After the annular protrusion 12 at the end of the nut 1 passes through the inner ring of the washer 2, during the tightening process of the nut 1 and the bolt, the protrusion 12 is subjected to axial pressure and turns outward, forming a riveting structure with the washer 2, thus fixing the nut 1 and the washer 2 in the axial direction. This riveting structure not only restricts the relative axial movement between the nut 1 and the washer 2, but also increases the friction between them through the clamping force after the protrusion turns outward, thus helping to restrict circumferential rotation.

[0029] In order to limit the relative rotation between the washer 2 and the fastener, in one alternative, the washer 2 is provided with a number of protruding teeth 22 on the other side of the nut 1.

[0030] The washer 2 has protruding teeth 22 on the side facing the fastener. When the nut 1 is tightened, the washer 2 is pressed against the surface of the fastener, and the protruding teeth 22 embed into the surface of the fastener or create indentations, increasing the frictional resistance between the washer 2 and the fastener and restricting the circumferential rotation of the washer 2 relative to the fastener. Moreover, during the tightening process, the protruding teeth 22 can scrape off the coating or plating on the surface of the outer body. When the body and the washer 2 are in close contact, an electrical current is formed, preventing corrosion caused by a potential difference between the nut 1 and the body.

[0031] In order to facilitate the limiting of the nut 1 when it is installed at multiple angles, in one optional scheme, the number of limiting grooves 21 is multiple and they are distributed along the circumference of the gasket 2.

[0032] Multiple limiting grooves 21 are evenly or non-uniformly distributed along the circumference of the gasket 2. When the nut 1 is rotated to different angles, the locking part 3 can cooperate with one of the limiting grooves 21, without the need for precise alignment of a specific position, thus improving assembly efficiency.

[0033] To improve the balance and reliability of the limiting structure, in one alternative scheme, the number of locking elements 3 is at least two, and they are diagonally distributed around the axis of the nut 1.

[0034] Two or more locking elements 3 are diagonally distributed around the axis of nut 1 to form a symmetrical limiting structure, making the circumferential limiting force distribution between nut 1 and washer 2 more uniform.

[0035] The above embodiments can be implemented individually or in combination. During the complete operation of the anti-loosening nut 1, the nut 1 is tightened with the bolt, the washer 2 is located between the nut 1 and the fastened part, and the locking member 3 is inserted into the slot 11 of the nut 1 and embedded in the limiting groove 21 of the washer 2, forming a circumferential limit. When the nut 1 is subjected to vibration and tends to loosen, the locking member 3 abuts against the side wall of the limiting groove 21, restricting the circumferential rotation of the nut 1 relative to the washer 2. If an inclined locking member 3 is used, the inclined end forms a locking effect with the limiting groove 21, further increasing the limiting force. If a riveting structure is used, the nut 1 and the washer 2 are axially fixedly connected, preventing axial separation. If the washer 2 is provided with protruding teeth 22, the relative rotation between the washer 2 and the fastened part is restricted. The combined action of multiple limiting grooves 21 and diagonally distributed locking members 3 helps to provide a stable anti-loosening effect under any angle and complex load.

[0036] In a further configuration, a spring is installed inside the slot 11. After the locking member 3 is inserted into the slot 11, the spring is located between the locking member 3 and the slot 11. By setting this structure, the locking member 3, which originally needed to generate relative rotation through its own deformation or that of the washer, can now rotate by engaging with the limiting groove 21. When rotating, the limiting groove 21 presses against the end of the locking member 3, causing it to retract and rotate smoothly. When rotating in the opposite direction, the limiting groove 21 will contact the side of the locking member 3 and simultaneously engage with the inner wall of the slot 11 to form a lock, achieving a one-way locking effect and preventing the nut 1 from loosening.

[0037] The above description is merely a preferred embodiment of the present invention. The scope of protection of the present invention is not limited to the above embodiments. All technical solutions falling within the scope of the present invention's concept are within the scope of protection of the present invention. It should be noted that for those skilled in the art, any improvements and modifications made without departing from the principle of the present invention should also be considered within the scope of protection of the present invention.

Claims

1. A lock nut, comprising a nut and a washer, characterized in that, A locking element is also provided between the nut and the washer. The washer has several limiting grooves on one side corresponding to the nut. The nut has a slot for inserting the locking element. The nut and the washer are restricted from circumferential rotation by the cooperation of the locking element and the limiting grooves.

2. The anti-loosening nut according to claim 1, characterized in that, The locking element is inclined at least at one end that extends out of the nut.

3. The anti-loosening nut according to claim 2, characterized in that, The locking element is tilted at an obtuse angle to the direction in which the nut rotates to lock.

4. The anti-loosening nut according to claim 3, characterized in that, The locking element and the limiting groove are positioned at an angle to form a sharp corner.

5. The anti-loosening nut according to claim 1, 2, 3, or 4, characterized in that, The locking element is cylindrical, and the slot is adapted to the locking element. The slot is inclined so that the locking element can be inserted into an inclined state.

6. The anti-loosening nut according to claim 1, characterized in that, The end of the nut corresponding to the washer is provided with an annular protrusion. The protrusion is adapted to the inner ring of the washer and is used to extend through the inner ring of the washer. When the nut is tightened with the bolt, the protrusion is turned outward by pressure and riveted to the washer.

7. The anti-loosening nut according to claim 1, characterized in that, The washer has several protruding teeth on the opposite side of the nut.

8. The anti-loosening nut according to claim 1, characterized in that, The number of limiting grooves is multiple, and they are distributed along the circumference of the gasket.

9. The anti-loosening nut according to claim 1, characterized in that, The number of locking elements is at least two, and they are diagonally distributed around the axis of the nut.

10. The anti-loosening nut according to claim 5, characterized in that, A spring is installed inside the slot. After the locking member is inserted into the slot, the spring is located between the locking member and the slot.

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