Non-loose bolt and nut assembly

Abstract

The utility model discloses a bolt and nut assembly capable of never loosening. A connecting nut thread (13) on a connecting nut (4) is screwed into a connecting thread (12) in the middle of the bolt (2), a locking gasket (6) is placed on connecting nut anti-skid teeth (5) on the connecting nut (4), and a locking thread (10) on a locking nut (8) is screwed into a locking thread (10) on the top of the bolt (2). Stop gasket anti-skid teeth (7) arranged on the lower portion of the stop gasket (6) are clamped into connecting nut anti-skid teeth (5) arranged on the upper portion of the connecting nut (4), and the stop gasket anti-skid teeth (7) arranged on the upper portion of the stop gasket (6) are clamped into locking nut anti-skid teeth (9) arranged on the lower portion of the locking nut (8). According to the utility model, reliable connection is realized, the operation reliability is improved, the maintenance is reduced, and the bolt and nut are never loosened after connection.

Description

Technical Field

[0001] The utility model belongs to the technical field of fasteners, and in particular relates to a bolt and nut assembly that never loosens. Background Art

[0002] Currently, in addition to mechanical anti-loosening methods to prevent threaded connections from loosening forever, such as using safety holes or cotter pins to prevent the nut from rotating, this connection method is the most reliable, but the assembly method is limited. There are currently no other connection structures that can achieve permanent anti-loosening through threaded pairs. The most commonly used method is threaded pairs, which achieve the purpose of locking through deformation of the closing end. This method has a fast locking decay and is very easy to loosen under dynamic loads. Another method uses double nuts to prevent loosening, which is also easy to loosen under dynamic loads. The structure is relatively good, such as Tang's thread, which is assembled by two nuts with opposite rotation directions. It can save time for nut loosening to a certain extent, but it still cannot achieve the effect of permanent anti-loosening. Currently, Japan's hardlock nuts are more commonly used. The anti-loosening principle adopts double nuts. The mating surfaces of the two nuts adopt an eccentric design. The nut will exert pressure on the locking nut when there is a tendency to loosen. Due to the eccentric design between the locking nut and the connecting nut, similar to the principle of wedge, the locking nut and the bolt fit tighter, the nut loosening decays slowly, and can remain anti-loose for a long time, but it will gradually loosen over time. Summary of the Invention

[0003] The purpose of the utility model is to overcome the above-mentioned shortcomings and provide a reliable connection, improve operational reliability and reduce maintenance, and provide a bolt and nut assembly that will never loosen after the bolt and nut are connected.

[0004] The purpose of this utility model and the solution of its main technical problems are achieved by adopting the following technical solutions:

[0005] The utility model discloses a bolt and nut assembly that never loosens, comprising a bolt, a connecting nut, connecting nut anti-slip teeth, a stopping washer, stopping washer anti-slip teeth, a locking nut, locking nut anti-slip teeth, a locking thread, a locking nut thread, a connecting thread, and a connecting nut thread, and is characterized in that the connecting thread in the middle of the bolt is screwed into the connecting nut thread on the connecting nut, a stopping washer is placed on the connecting nut anti-slip teeth above the connecting nut, the locking thread on the locking nut is screwed into the locking thread on the locking nut on the top of the bolt, the stopping washer anti-slip teeth arranged below the stopping washer are clamped into the connecting nut anti-slip teeth arranged above the connecting nut, and the stopping washer anti-slip teeth arranged above the stopping washer are clamped into the locking nut anti-slip teeth provided below the locking nut.

[0006] The lower end of the locking nut is sleeved on the outside of the upper part of the connecting thread.

[0007] The pitch of the connecting thread is greater than the pitch of the locking thread, and the major diameter of the locking thread is smaller than the minor diameter of the connecting thread.

[0008] The anti-skid teeth provided on the outer spring washer of the stop washer have a pitch and size twice that of the anti-skid teeth of the connecting nut and the anti-skid teeth of the locking nut, respectively. The stop washer has deformation space for elastic deformation during assembly.

[0009] The lower ends of the bolts are respectively covered with gaskets A and B.

[0010] Compared with the prior art, the utility model has obvious beneficial effects; it can be seen from the above technical scheme: the connecting thread in the middle of the bolt is screwed into the connecting nut thread on the connecting nut, a stopping washer is placed on the connecting nut anti-slip teeth on the connecting nut, the locking thread on the locking nut is screwed into the locking thread on the locking nut, the stopping washer anti-slip teeth arranged under the stopping washer are clamped into the connecting nut anti-slip teeth arranged above the connecting nut, and the stopping washer anti-slip teeth arranged above the stopping washer are clamped into the locking nut anti-slip teeth arranged below the locking nut. The threaded connection end of the connecting bolt consists of two ends of threads, namely the connecting thread and the locking thread. The two threads have the same rotation direction, usually right-hand thread, the connecting thread pitch is greater than the locking thread pitch, the locking thread major diameter is smaller than the connecting thread minor diameter, and the connecting thread can pass through the locking thread during assembly. For example, the connecting thread is M10×1.5 and the locking thread is M8×1; the gasket is a conventional open spring gasket, which provides pre-tightening force during assembly to prevent the connection unit from loosening; the connection unit A and the connection unit B are the connected parts; the connecting nut is provided with a connecting nut thread, the thread specification of the connecting nut thread is consistent with the connecting thread of the bolt, and the connecting thread of the bolt is consistent with the connecting thread of the connecting nut The female threads mate to connect connection unit A and connection unit B. The upper end of the connecting nut features anti-slip teeth, preventing rotation after assembly. The locknut has locking threads that mate with the locking threads on the connecting bolt. Anti-slip teeth, identical in shape and size, are located on the lower end of the locknut to prevent rotation after assembly. The stop washer features anti-slip teeth with a pitch and size twice that of the locknut and connection nut anti-slip teeth. During assembly, the teeth mate directly with each other, leaving some elastic space to tighten the locknut. A bottom hole, larger than the major diameter of the connecting threads, compresses the connecting nut during assembly. This ensures a secure connection, improves operational reliability, and reduces maintenance. Once the bolt and nut are connected, they never loosen. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 It is a structural diagram of the utility model;

[0012] Figure 2 This is a front view of gasket A and gasket B of the utility model;

[0013] Figure 3 It is a top view of gasket A and gasket B of the utility model;

[0014] Figure 4 It is a structural diagram of the bolt of the utility model;

[0015] Figure 5 This is the main view of the connecting nut of the utility model;

[0016] Figure 6 It is a top view of the connecting nut of the utility model;

[0017] Figure 7 This is a front view of the stop washer and the anti-slip teeth of the stop washer of the utility model;

[0018] Figure 8 It is a top view of the stop washer and the anti-slip teeth of the stop washer of the utility model;

[0019] Figure 9 This is a front view of the lock nut, lock nut anti-slip teeth, and lock nut threads of the utility model;

[0020] Figure 10 It is a top view of the locking nut, the locking nut anti-slip teeth, and the locking nut threads of the utility model;

[0021] Figure 11 This is a usage state diagram of the utility model.

[0022] Marking in the figure

[0023] 1. Washer A, 2. Bolt, 3. Washer B, 4. Connecting nut, 5. Connecting nut anti-slip teeth, 6. Stop washer, 7. Stop washer anti-slip teeth, 8. Locking nut, 9. Locking nut anti-slip teeth, 10. Locking thread, 11. Locking nut thread, 12. Connecting thread, 13. Connecting nut thread, 14. Connecting unit A, 15. Connecting unit 2B. DETAILED DESCRIPTION

[0024] The following is a detailed description of the specific implementation, structure, features and effects of the present invention in conjunction with the accompanying drawings and preferred embodiments.

[0025] The utility model discloses a bolt and nut assembly that never loosens, comprising a washer A1, a bolt 2, a washer B3, a connecting nut 4, a connecting nut anti-slip tooth 5, a stop washer 6, a stop washer anti-slip tooth 7, a locking nut 8, a locking nut anti-slip tooth 9, a locking thread 10, a locking nut thread 11, a connecting thread 12, and a connecting nut thread 13, characterized in that the connecting thread 12 in the middle of the bolt 2 is screwed into the connecting nut thread 13 on the connecting nut 4, a stop washer 6 is placed on the connecting nut anti-slip tooth 5 above the connecting nut 4, and the locking thread 10 at the top of the bolt 2 is screwed into the locking thread on the locking nut 8 10. The stop washer anti-slip teeth 7 provided under the stop washer 6 are inserted into the connecting nut anti-slip teeth 5 provided on the connecting nut 4. The stop washer anti-slip teeth 7 provided on the stop washer 6 are inserted into the locking nut anti-slip teeth 9 provided under the locking nut 8. The lower end of the locking nut 8 is sleeved on the outside of the upper part of the connecting thread 12. The pitch of the connecting thread 12 is greater than the pitch of the locking thread 10. The major diameter of the locking thread 10 is smaller than the minor diameter of the connecting thread 12. The pitch and size of the anti-slip teeth 7 provided on the stop washer 6 are respectively twice that of the connecting nut anti-slip teeth 5 and the locking nut anti-slip teeth 9. The lower end of the bolt 2 is respectively sleeved with gaskets A1 and gasket B3.

[0026] When using, see Figure 11 During assembly, the connecting bolt 2 and the gasket A1 and the gasket B3 connect the connecting unit A14 and the connecting unit B15 together. The gasket A1 and the gasket B3 are spring washers that can provide pre-tightening force. After tightening, the stop gasket 6 and the lock nut 8 are added. By applying a tightening torque to the lock nut 8, the connecting nut 4 and the lock nut 8 are meshed through the two end surfaces of the stop gasket 6 through the stop gasket 6. In the absence of external force, the connecting nut 4 and the lock nut 8 will not rotate relative to each other. Since the gasket A1 and the gasket B3 pre-apply pre-tightening force to the connecting unit A14 and the connecting unit B15, the gasket A1 and the gasket B3 are in a compressed state, so the connecting nut 4 has a tendency to rotate to the right, and the connecting unit A14 and the connecting unit B15 will be in a compressed state, so the connecting nut 4 will not be tightened. When the connecting nut 4 has a tendency to rotate to the left and loosen, the pre-tightening force has been applied to the lock nut 8 by the stop washer 6, meshing the connecting nut 4 and the lock nut 8 together. Without applying a large external force, the torque provided by the connecting nut 4 under dynamic load will not cause the meshing teeth to rotate. Since the pitch of the lock nut 8 is smaller than the pitch of the connecting nut 4, when there is a tendency to rotate in the loosening direction, since the lock nut 8 and the connecting nut 4 are meshed together by the stop washer 6, the connecting nut 4 and the lock nut 8 must maintain the same rotation speed when unscrewing. However, since the pitch of the connecting nut 4 is larger than the pitch of the lock nut 8, the pitch of the connecting nut 4 when unscrewing is greater than the pitch of the lock nut 8, and the lock nut 8 will hinder the unscrewing of the connecting nut 4. Thus, the purpose of permanent anti-loosening is achieved.

[0027] The above description is only a preferred embodiment of the present invention and does not constitute any form of limitation to the present invention. Any simple modification, equivalent change and modification of the above embodiment made according to the technical essence of the present invention without departing from the content of the technical solution of the present invention shall still fall within the scope of the technical solution of the present invention.

Claims

1. A bolt and nut assembly that never loosens, comprising a bolt (2), a connecting nut (4), a connecting nut anti-slip tooth (5), a stop washer (6), a stop washer anti-slip tooth (7), a locking nut (8), a locking nut anti-slip tooth (9), a locking thread (10), a locking nut thread (11), a connecting thread (12), and a connecting nut thread (13), characterized in that; The connecting thread (12) in the middle of the bolt (2) is screwed into the connecting nut thread (13) on the connecting nut (4), and a stop washer (6) is placed on the connecting nut anti-skid teeth (5) above the connecting nut (4). The locking thread (10) at the top of the bolt (2) is screwed into the locking thread (10) on the locking nut (8), and the stop washer anti-skid teeth (7) provided below the stop washer (6) are inserted into the connecting nut anti-skid teeth (5) provided above the connecting nut (4), and the stop washer anti-skid teeth (7) provided above the stop washer (6) are inserted into the locking nut anti-skid teeth (9) provided below the locking nut (8).

2. The bolt and nut assembly that never loosens according to claim 1, characterized in that; The lower end of the locking nut (8) is sleeved on the outside of the upper portion of the connecting thread (12).

3. The bolt and nut assembly that never loosens according to claim 1, characterized in that; The pitch of the connecting thread (12) is greater than the pitch of the locking thread (10), and the major diameter of the locking thread (10) is smaller than the minor diameter of the connecting thread (12).

4. The bolt and nut assembly that never loosens according to claim 1, characterized in that; The anti-skid teeth (7) provided on the outer spring washer of the stop washer (6) have a pitch and size that are twice that of the anti-skid teeth (5) of the connecting nut and the anti-skid teeth (9) of the locking nut.

5. The bolt and nut assembly that never loosens according to claim 1, characterized in that; The lower ends of the bolts (2) are respectively covered with a gasket A (1) and a gasket B (3).

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