Screw thread pair locking device

Abstract

The utility model provides a thread pair locking device which comprises a screw rod, a first nut, a second nut, a first gasket and a second gasket, a plurality of wedge teeth are arranged on the surface of the first gasket and the surface of the second gasket, the length direction of the wedge teeth is the same as the radial direction of the first gasket or the second gasket, a wedge groove is formed between any two adjacent wedge teeth in a surrounding mode, and the wedge teeth are arranged in the wedge groove. A boss is arranged on the surface of the first nut, a groove is formed in the surface of the second nut, the first nut and the second nut are both in threaded connection with the screw, the boss is sleeved with the groove, the screw further penetrates through the first gasket and the second gasket, the wedge teeth are sleeved with the wedge grooves, and the surface of the first gasket and the surface of the second nut are attached to each other. By the adoption of the technical scheme, the conical boss and the groove are sleeved with each other, the nuts are prevented from rotating through friction resistance between the adjacent nuts, the two adjacent gaskets are meshed with each other in the radial direction of the screw rod more stably, and the anti-loosening effect is improved.

Description

Technical Field

[0001] This utility model belongs to the field of fastener technology, and in particular relates to a threaded pair locking device. Background Technology

[0002] Equipment vibration is very common in engineering environments, but if not properly managed, it can lead to equipment vibration, component damage, and even major accidents. Traditional equipment installation typically uses friction to prevent loosening, with common methods including the use of flat washers and spring washers. This method is widely used in areas requiring frequent installation, but in practice, spring washers have poor anti-loosening performance. Double-nut anti-loosening is also a common measure, involving tightening two nuts with the same direction of rotation, then tightening them against each other. This causes the bottom nut to rub against both the washer and the second nut, providing a double-friction warning effect. However, under harsh operating conditions, such as when subjected to impact, vibration, or variable loads, the double-nut anti-loosening effect is unreliable.

[0003] In the prior art, patent document with authorization announcement number "CN211423133U" discloses an anti-loosening double nut structure, including two nuts arranged side by side. The two nuts include a mating convex nut and a concave nut. One side of the convex nut has a boss with an internal threaded hole, and one side of the concave nut has a concave hole that mates with and presses against the boss. The double nut structure eliminates the gap between the threads, greatly increasing frictional resistance and improving the anti-loosening effect. However, the above-mentioned patent technology still relies on the frictional force between the nuts for loosening. When the equipment vibrates significantly, the frictional resistance is insufficient to completely prevent loosening, and a significant risk of loosening still exists. Utility Model Content

[0004] To solve the above-mentioned technical problems, this utility model provides a threaded pair locking device.

[0005] This utility model is achieved through the following technical solution.

[0006] This utility model provides a threaded locking device, including a screw, a first nut, a second nut, a first washer, and a second washer. The surfaces of the first and second washers are each provided with multiple wedge teeth. The length direction of the wedge teeth is the same as the radial direction of the first or second washer, and any two adjacent wedge teeth form a wedge groove. The surface of the first nut is provided with a boss, and the surface of the second nut is provided with a groove. Both the first and second nuts are screwed to the screw, with the boss fitting into the groove. The screw also passes through the first and second washers, with the wedge teeth fitting into the wedge groove. The surfaces of the first washer and the second nut are also in contact with each other.

[0007] The wedge tooth is in the shape of a triangular frustum. One side surface of the wedge tooth is used as the first wedge surface, and the other side surface of the wedge tooth is used as the second wedge surface. The inclination angle between the first wedge surface and the radial section of the screw is greater than zero, and the second wedge surface is parallel to the axial direction of the screw.

[0008] The angle between the first wedge-shaped surface and the radial section of the screw is greater than the thread angle of the screw.

[0009] The wedge teeth are also provided on the surface of the second nut.

[0010] The boss and the groove are identical in shape and size. The boss is a frustum-shaped structure, and the taper angle of the boss is greater than the thread angle of the screw.

[0011] The surface of the boss is also provided with multiple notches and grooves, which are evenly distributed in an array along the outer periphery of the boss.

[0012] The number of notches is 4.

[0013] The first nut or the second nut is in the shape of a hexagonal prism.

[0014] The surface of the first nut is also provided with a plurality of tool grooves, the length direction of which is consistent with the radial direction of the first nut, and the plurality of tool grooves are evenly distributed in an array around the central axis of the first nut.

[0015] The number of tool slots is 4.

[0016] The beneficial effects of this utility model are as follows: When the double nuts are tightened, the conical boss and the groove fit together, and the frictional resistance between adjacent nuts prevents the nuts from rotating. On the other hand, the washer surface is also provided with wedge teeth. The axial pressure generated between the double nuts is transmitted to the smaller wedge teeth, so that the two adjacent washers can be more stably engaged with each other along the radial direction of the screw. In addition, the wedge teeth on the washer surface will also firmly grip the surface of one of the nuts, further preventing the nuts and washers from rotating and improving the anti-loosening effect. Attached Figure Description

[0017] Figure 1 This is the front view of this utility model;

[0018] Figure 2 This is a front view of the first nut of this utility model;

[0019] Figure 3 This is a left view of the first nut of this utility model;

[0020] Figure 4 This is a bottom view of the first nut of this utility model;

[0021] Figure 5 This is a front view of the second nut of this utility model;

[0022] Figure 6 This is a front view of the first washer of this utility model;

[0023] Figure 7 This is a top view of the first washer of this utility model;

[0024] Figure 8 This is a utility model Figure 8 A magnified view of section I in the middle.

[0025] In the diagram: 1-Screw, 2-First nut, 3-Second nut, 4-First washer, 5-Second washer, 6-Wedge tooth, 7-Wedge groove, 8-Boss, 9-Groove, 10-First wedge surface, 11-Second wedge surface, 12-Notch groove, 13-Tool groove, 14-First part, 15-Second part. Detailed Implementation

[0026] The technical solution of this utility model is further described below, but the scope of protection is not limited to what is described.

[0027] like Figures 1 to 8 As shown, this utility model provides a threaded locking device for fixing a first part 14 and a second part 15 together. It includes a screw 1, a first nut 2, a second nut 3, a first washer 4, and a second washer 5. The surfaces of the first washer 4 and the second washer 5 are provided with a plurality of wedge teeth 6. The length direction of the wedge teeth 6 is the same as the radial direction of the first washer 4 or the second washer 5, and any two adjacent wedge teeth 6 surround each other to form a wedge groove 7. The surface of the first nut 2 is provided with a boss 8, and the surface of the second nut 3 is provided with a groove 9. The first nut 2 and the second nut 3 are both screwed to the screw 1, and the boss 8 is fitted into the groove 9. The screw 1 also passes through the first washer 4 and the second washer 5, and the wedge teeth 6 are fitted into the wedge groove 7. The surfaces of the first washer 4 and the second nut 3 are also in contact with each other.

[0028] The technical solution of this utility model has the following advantages: First, when the double nuts are tightened, the conical boss and the groove fit together, and the frictional resistance between adjacent nuts prevents the nuts from rotating. Second, the washer surface is also provided with wedge teeth. The axial pressure generated between the double nuts is transmitted to the smaller wedge teeth, so that the two adjacent washers can be more stably engaged with each other along the radial direction of the screw. In addition, the wedge teeth on the washer surface will also firmly grip the surface of one of the nuts, further preventing the nuts and washers from rotating and improving the anti-loosening effect.

[0029] Specifically, the wedge tooth 6 is in the shape of a triangular frustum. One side surface of the wedge tooth 6 is used as the first wedge surface 10, and the other side surface of the wedge tooth 6 is used as the second wedge surface 11. The inclination angle between the first wedge surface 10 and the radial section of the screw 1 is greater than zero, and the second wedge surface 11 is parallel to the axial direction of the screw 1.

[0030] Preferably, the inclination angle between the first wedge-shaped surface 10 and the radial section of the screw 1 is greater than the thread angle of the screw 1. The wedge teeth 6 are also disposed on the surface of the second nut 3. Using the technical solution of this utility model, when the nut is tightened, the axial pressure generated between the two nuts is transmitted to the smaller wedge teeth, making the second nut and the first washer more stably interlock along the radial direction of the screw, further preventing the nut and washer from rotating and improving the anti-loosening effect.

[0031] Furthermore, the boss 8 and the groove 9 are identical in shape and size. The boss 8 is a frustum-shaped cone, and its taper angle is greater than the thread angle of the screw 1. The surface of the boss 8 is also provided with multiple notches 12, which are evenly distributed along the outer circumference of the boss 8. Preferably, there are four notches 12. By employing the technical solution of this invention, the presence of multiple notches 12 on the surface of the boss 8 gives it slight elasticity. When tightening the nut, the boss can more effectively grip the screw along the radial direction, further preventing the nut and washer from rotating and improving the anti-loosening effect.

[0032] Furthermore, the first nut 2 or the second nut 3 is generally hexagonal prism in shape. The surface of the first nut 2 is also provided with multiple tool slots 13, the length direction of which is consistent with the radial direction of the first nut 2, and the multiple tool slots 13 are evenly distributed in an array around the central axis of the first nut 2. Preferably, the number of tool slots 13 is four. This facilitates the operator to disassemble or assemble the nut using tools such as flathead screwdrivers.

Claims

1. A threaded pair locking device, characterized in that: The assembly includes a screw (1), a first nut (2), a second nut (3), a first washer (4), and a second washer (5). The surfaces of the first washer (4) and the second washer (5) are provided with multiple wedge teeth (6). The length direction of the wedge teeth (6) is the same as the radial direction of the first washer (4) or the second washer (5), and any two adjacent wedge teeth (6) form a wedge groove (7). The surface of the first nut (2) is provided with a boss (8), and the surface of the second nut (3) is provided with a groove (9). The first nut (2) and the second nut (3) are both screwed to the screw (1), and the boss (8) is fitted into the groove (9). The screw (1) also passes through the first washer (4) and the second washer (5), and the wedge teeth (6) are fitted into the wedge groove (7). The surfaces of the first washer (4) and the second nut (3) are also in contact with each other.

2. The threaded pair locking device as described in claim 1, characterized in that: The wedge tooth (6) is in the shape of a triangular truncated pyramid. One side surface of the wedge tooth (6) is used as the first wedge surface (10), and the other side surface of the wedge tooth (6) is used as the second wedge surface (11). The inclination angle between the first wedge surface (10) and the radial section of the screw (1) is greater than zero, and the second wedge surface (11) is parallel to the axial direction of the screw (1).

3. The threaded pair locking device as described in claim 2, characterized in that: The inclination angle between the first wedge surface (10) and the radial section of the screw (1) is greater than the thread angle of the screw (1).

4. The threaded pair locking device as described in claim 1, characterized in that: The wedge tooth (6) is also provided on the surface of the second nut (3).

5. The threaded pair locking device as described in claim 1, characterized in that: The boss (8) and the groove (9) are identical in shape and size. The boss (8) is a frustum shape and the taper angle of the boss (8) is greater than the thread angle of the screw (1).

6. The threaded pair locking device as described in claim 1 or 5, characterized in that: The surface of the boss (8) is also provided with a plurality of notches (12), and the plurality of notches (12) are evenly distributed in an array along the outer periphery of the boss (8).

7. The threaded pair locking device as described in claim 6, characterized in that: The number of notches (12) is 4.

8. The threaded pair locking device as described in claim 1, characterized in that: The first nut (2) or the second nut (3) is a hexagonal prism shape.

9. The threaded pair locking device as described in claim 1 or 8, characterized in that: The surface of the first nut (2) is also provided with a plurality of tool grooves (13). The length direction of the tool grooves (13) is consistent with the radial direction of the first nut (2), and the plurality of tool grooves (13) are evenly distributed in an array around the central axis of the first nut (2).

10. The threaded pair locking device as described in claim 9, characterized in that: The number of tool slots (13) is 4.

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