Double-nut double-gasket anti-loose locking structure

Abstract

The invention provides a double-nut double-gasket anti-loose locking structure which comprises a screw, a first nut, a second nut, a first gasket and a second gasket, a plurality of wedge teeth are arranged on the surfaces of the first gasket and the second gasket, and 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, 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 rod, the boss is sleeved with the groove, the screw rod further penetrates through the first gasket and the second gasket, and the wedge teeth are sleeved with the wedge grooves. The surfaces of the first gasket and 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 more stably in the radial direction of the screw, and the anti-loosening effect is improved.

Description

Technical Field

[0001] The invention belongs to the technical field of fasteners, and in particular relates to a double-nut double-washer anti-loosening locking structure. Background Art

[0002] Equipment vibration is very common in engineering environments, but if you don't pay attention, it will often cause equipment vibration, component damage, and even major accidents. Traditional equipment installation usually uses friction to prevent loosening. Commonly used anti-loosening methods include flat washers and spring washers. This method is widely used in parts that require frequent installation, but in actual use, the anti-loosening effect of spring washers is poor; double nut anti-loosening is also a common anti-loosening measure. After tightening two nuts with the same rotation direction, the two nuts are screwed together, so that the bottom nut has friction with both the gasket and the second nut, and the double friction achieves an early warning effect. However, under some harsh working conditions, such as when affected by shock, vibration or variable loads, the anti-loosening effect of the top double nut is not reliable.

[0003] In the prior art, the patent document with the authorization announcement number "CN211423133U" discloses a double nut structure for preventing loosening, including two nuts arranged side by side, the two nuts including a convex nut and a concave nut that match each other, a boss is provided on one side of the convex nut, an internal threaded hole of the convex nut is provided in the boss, and a concave hole that matches the boss and squeezes the boss is provided on one side of the concave nut. The concave-convex double nut eliminates the gap between the threads, and the friction resistance is greatly increased, thereby improving the friction-proof loosening effect of the double nut. However, the above patent technology still relies on the friction between the nuts for loosening. When the vibration force of the equipment is large, the friction resistance is not enough to completely prevent loosening, and there is still a large risk of loosening. Summary of the invention

[0004] In order to solve the above technical problems, the present invention provides a double-nut double-washer anti-loosening locking structure.

[0005] The present invention is achieved through the following technical solutions.

[0006] The present invention provides a double-nut double-washer anti-loosening locking structure, comprising a screw, a first nut, a second nut, a first washer and a second washer, the surfaces of the first washer and the second washer are both provided with a plurality of wedge teeth, the length direction of the wedge teeth is the same as the radial direction of the first washer or the second washer, and a wedge groove is formed around any two adjacent wedge teeth, the surface of the first nut is provided with a boss, and the surface of the second nut is provided with a groove, the first nut and the second nut are both threadedly connected to the screw, and the boss is sleeved in the groove, the screw also passes through the first washer and the second washer, and the wedge teeth are sleeved in the wedge groove, and 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 prism as a whole, with one side surface of the wedge tooth being used as a first wedge surface, and the other side surface of the wedge tooth being used as a second wedge surface. The inclination angle of the first wedge surface relative to the radial cross section of the screw is greater than zero, and the second wedge surface is parallel to the axial direction of the screw.

[0008] An inclination angle of the first wedge surface relative to a radial cross section of the screw is greater than a thread angle of the screw.

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

[0010] The boss and the groove are consistent in shape and size, the boss is in the shape of a frustum as a whole, 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 a plurality of notched grooves, and the plurality of notched grooves are evenly distributed in an array along the outer peripheral surface of the boss.

[0012] The number of the notch grooves is 4.

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

[0014] The surface of the first nut is also provided with a plurality of tool grooves, the length direction of the tool grooves 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 the tool slots is 4.

[0016] The beneficial effect of the present invention lies in: adopting the technical solution of the present invention, on the one hand, when the double nuts are tightened, the conical boss and the groove fit together, and the friction resistance between adjacent nuts is used to prevent the nuts from rotating. On the other hand, wedge teeth are also provided on the surface of the washer, and the axial pressure generated between the double nuts is transmitted to the wedge teeth with smaller areas, so that the two adjacent washers can more stably bite each other along the radial direction of the screw. In addition, the wedge teeth on the surface of the washer also tightly grasp the surface of one of the nuts, further preventing the nut and the washer from rotating, and improving the anti-loosening effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a front view of the present invention;

[0018] Figure 2 is a front view of a first nut of the present invention;

[0019] Figure 3 is a left side view of the first nut of the present invention;

[0020] Figure 4 is a bottom view of the first nut of the present invention;

[0021] Figure 5 is a front view of a second nut of the present invention;

[0022] Figure 6 is a front view of a first gasket of the present invention;

[0023] Figure 7 is a top view of the first gasket of the present invention;

[0024] Figure 8 The present invention Figure 7 A partial enlarged view of point Ⅰ in the middle.

[0025] In the figure: 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 DESCRIPTION

[0026] The technical solution of the present invention is further described below, but the scope of protection claimed is not limited to the description.

[0027] like Figures 1 to 8 As shown, the present invention provides a double-nut double-washer anti-loosening locking structure for fixing a first part 14 and a second part 15 together, comprising a screw rod 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 both 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 a wedge groove 7 is formed around any two adjacent wedge teeth 6, 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 threadedly connected to the screw rod 1, and the boss 8 is sleeved in the groove 9, the screw rod 1 also passes through the first washer 4 and the second washer 5, and the wedge teeth 6 are sleeved in the wedge groove 7, and the surfaces of the first washer 4 and the second nut 3 are also in contact with each other.

[0028] By adopting the technical solution of the present invention, on the one hand, when the double nuts are tightened, the conical boss and the groove fit together, and the friction resistance between adjacent nuts is used to prevent the nuts from rotating. On the other hand, wedge teeth are also provided on the surface of the washer, and the axial pressure generated between the double nuts is transmitted to the wedge teeth with smaller areas, so that the two adjacent washers can more stably engage with each other along the radial direction of the screw. In addition, the wedge teeth on the surface of the washer also tightly grasp the surface of one of the nuts, further preventing the nut and the washer from rotating, thereby improving the anti-loosening effect.

[0029] Specifically, the wedge tooth 6 is a triangular prism shape as a whole, and 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 of the first wedge surface 10 relative to the radial section of the screw 1 is greater than the thread angle of the screw 1. The wedge teeth 6 are also provided on the surface of the second nut 3. With the technical solution of the present invention, when the nuts are tightened, the axial pressure generated between the double nuts is transmitted to the wedge teeth with a smaller area, so that the second nut and the first washer can be more stably engaged with each other along the radial direction of the screw, further preventing the nut and the washer from rotating, and improving the anti-loosening effect.

[0031] In addition, the boss 8 and the groove 9 are consistent in shape and size. The boss 8 is a frustum as a whole, and the taper angle of the boss 8 is greater than the thread angle of the screw 1. The surface of the boss 8 is also provided with a plurality of notched grooves 12, and the plurality of notched grooves 12 are evenly distributed in an array along the outer peripheral surface of the boss 8. Preferably, the number of notched grooves 12 is 4. With the technical solution of the present invention, since the surface of the boss 8 is also provided with a plurality of notched grooves 12, the boss has a slight elasticity. When the nut is tightened, the boss can more forcefully hold the screw in the radial direction of the screw, further preventing the nut and the washer from rotating, and improving the anti-loosening effect.

[0032] In addition, the first nut 2 or the second nut 3 is in the shape of a hexagonal prism as a whole. A plurality of tool grooves 13 are also provided on the surface of the first nut 2, 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. Preferably, the number of tool grooves 13 is 4. This makes it convenient for an operator to use a tool such as a flat screwdriver to disassemble or assemble the nut.

Claims

1. A double-nut double-washer anti-loosening locking structure, characterized in that: The invention comprises a screw rod (1), a first nut (2), a second nut (3), a first washer (4) and a second washer (5), wherein the surfaces of the first washer (4) and the second washer (5) are both 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 a wedge groove (7) is formed around any two adjacent wedge teeth (6), 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 threadedly connected to the screw rod (1), and the boss (8) is sleeved in the groove (9), the screw rod (1) also passes through the first washer (4) and the second washer (5), and the wedge teeth (6) are sleeved in the wedge groove (7), and the surfaces of the first washer (4) and the second nut (3) are also in contact with each other.

2. The double-nut double-washer anti-loosening locking structure according to claim 1, characterized in that: The wedge tooth (6) is in the shape of a triangular prism as a whole, one side surface of the wedge tooth (6) is used as a first wedge surface (10), and the other side surface of the wedge tooth (6) is used as a second wedge surface (11). The inclination angle of the first wedge surface (10) relative to the radial cross 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 double-nut double-washer anti-loosening locking structure according to claim 2, characterized in that: The inclination angle of the first wedge surface (10) relative to the radial cross section of the screw (1) is greater than the thread angle of the screw (1).

4. The double-nut double-washer anti-loosening locking structure according to claim 1, characterized in that: The wedge teeth (6) are also arranged on the surface of the second nut (3).

5. The double-nut double-washer anti-loosening locking structure according to claim 1, characterized in that: The boss (8) and the groove (9) are consistent in shape and size; the boss (8) is in the shape of a frustum as a whole, and the taper angle of the boss (8) is greater than the thread angle of the screw (1).

6. The double-nut double-washer anti-loosening locking structure according to claim 1 or 5, characterized in that: The surface of the boss (8) is also provided with a plurality of notched grooves (12), and the plurality of notched grooves (12) are evenly distributed in an array along the outer peripheral surface of the boss (8).

7. The double-nut double-washer anti-loosening locking structure according to claim 6, characterized in that: The number of the notch grooves (12) is 4.

8. The double-nut double-washer anti-loosening locking structure according to claim 1, characterized in that: The first nut (2) or the second nut (3) is in the shape of a hexagonal prism as a whole.

9. The double-nut double-washer anti-loosening locking structure according to 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 double-nut double-washer anti-loosening locking structure according to claim 9, characterized in that: The number of the tool slots (13) is four.

Images