Lock nut with suspension type structure

Abstract

The utility model discloses a locknut with a suspension type structure. The locknut comprises a body and a shell. The body comprises a rod part and a head part, an internal thread used for fixing is arranged in the rod part, a through hole allowing the rod part to penetrate through is formed in the shell, the aperture of the through hole is larger than the outer diameter of the rod part, and a gap allowing the rod part to deform is formed between the through hole and the rod part; the end face of the shell is provided with a groove position used for containing the head portion, the bottom face of the shell and a fixed part form a first fulcrum, and a second fulcrum is formed between the lower end face of the head portion and the end face of the groove position, so that the rod portion is in a suspended state, and the end portion of the rod portion does not make contact with the end face of the fixed part. Vibration and rotating force generated by the fixed part are prevented from being directly transmitted to the rod part; due to the fact that the side wall of the rod portion is relatively thin, when the external thread of the screw and the internal thread of the rod portion are screwed tightly, the thin side wall of the rod body slightly deforms, force borne by the threads is redistributed, stress is made to be transferred towards the head portion, the thread of the suspension portion is stressed, and the stress clamping length is increased. The clamping force is prevented from being concentrated on two or three circles of threads, close to the clamped piece, of the internal thread fastener, and fatigue caused by stress concentration is effectively prevented.

Description

Technical Field

[0001] The utility model belongs to the technical field of fasteners, in particular to a suspension type structure anti-loosening nut. Background Art

[0002] Threaded fasteners provide important support for the development and progress of society. Threaded fasteners exist in everything from sanitary ware, bathroom, and kitchenware to automobiles, aerospace, buildings, and bridges. However, the premature failure of threaded connections seriously troubles us. Through the failure cases of threaded fasteners, it can be concluded that the two main causes of failure of threaded fasteners are fatigue and looseness of the fastener connection pair.

[0003] When the threaded fastener connection is locked, about 70% to 80% of the clamping force is concentrated on the 1-3 circles of teeth between the internal thread fastener and the clamped part. Figure 1 As shown, it is easy to cause the fastener connection pair to fail prematurely due to fatigue due to the action of axial force or the clamping force to decay too much, resulting in locking failure.

[0004] A large number of tests and studies have shown that transverse load is the main cause of slippage between the threads of fastener connections. When the connected parts slide slightly, the axis of the bolt will tilt, and there will be a change in pressure between the thread contact surface and the support surface. At this time, if there is relative movement between the thread surfaces, the imbalance between the upward resistance and downward resistance of the thread surface will cause the thread to slide in the direction of the loosening of the lower thread, resulting in rotational loosening. Utility Model Content

[0005] The utility model aims to provide a suspension type anti-loosening nut to solve the problems raised in the above background technology.

[0006] In order to achieve the above purpose, the utility model provides the following technical solutions:

[0007] A suspension type anti-loosening nut, comprising a body and a shell;

[0008] The body comprises a rod and a head, the rod is provided with an internal thread for fixing, the shell is provided with a through hole for the rod to pass through, the through hole has a diameter larger than the outer diameter of the rod, so that a gap is formed between the two for the rod to deform;

[0009] The end surface of the shell is provided with a slot for accommodating the head.

[0010] According to a further technical solution, an outwardly protruding step is provided between the rod portion and the head portion, and an outer wall of the step is in contact with an inner wall of the through hole.

[0011] According to a further technical solution, the outer radius of the rod is 1.1-1.35 times the distance from the inner thread to the center.

[0012] According to a further technical solution, the thickness of the head is 1.5-3 times the pitch of the internal thread.

[0013] According to a further technical solution, the total height of the body is h, the thickness of the head is e, the total height of the shell is H, the thickness of the slot is E, and he<HE.

[0014] According to a further technical solution, the size of the gap formed between the outer diameter of the rod and the diameter of the through hole is 0.8-1.5 times the pitch of the internal thread.

[0015] According to a further technical aspect, the head portion is designed with a sloped surface on one side close to the rod portion, and an angle b formed between the sloped surface and the rod portion is 101°-103°, and the end face of the groove is adapted to the sloped surface.

[0016] Beneficial effects of the utility model:

[0017] The bottom surface of the shell of the utility model forms a first fulcrum with the fixed part, and a second fulcrum is formed between the lower end surface of the head and the end surface of the groove, so that the rod is in a suspended state, and the end of the rod does not contact the end surface of the fixed part, thereby avoiding the vibration and rotational force generated by the fixed part to be directly transmitted to the rod; since the side wall of the rod is relatively thin, when the external thread of the screw and the internal thread of the rod are tightened with each other, the thin side wall of the rod body is slightly deformed, and the force exerted on the thread is redistributed, so that the stress is transferred toward the head direction. After the head is stressed, the clamping force is transmitted downward and dispersed to the suspended thread part. The suspended part of the thread is stressed so that the stress clamping length is lengthened, thereby avoiding the clamping force being concentrated on the 1-3 circles of teeth close to the internal thread fastener and the clamped part, and effectively preventing fatigue caused by stress concentration.

[0018] Other features and advantages of the present invention will be described in detail in the subsequent specific implementation section. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 : Schematic diagram of the prior art of the utility model.

[0020] Figure 2 : Disassembly diagram of the shell and body of the utility model.

[0021] Figure 3 : Partial structural section view of the utility model.

[0022] Figure 4 : The disassembled cross-sectional view of the utility model.

[0023] Figure 5 : The use state diagram of the utility model.

[0024] Figure numerals: 1-main body, 11-rod, 12-head, 13-internal thread, 14-step, 21-shell, 22-through hole, 23-flange, 24-slot, 3-gap, 41-screw, 42-nut, 5-fixed part. DETAILED DESCRIPTION

[0025] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the accompanying drawings in the embodiments of the present invention.

[0026] Please refer to Figure 2-5 ;

[0027] The loosening nut described in the utility model adopts a combined design to form a suspended structure so that the overall thread is stressed evenly; specifically, it comprises a body 1 and a shell 21; the body 1 comprises a rod 11 and a head 12, the rod 11 is provided with an internal thread 13 for fixing, the shell 21 is provided with a through hole 22 for the rod 11 to pass through, and the embodiment does not limit the shape of the through hole 22, for example, it can be a prism or a cylinder, and the rod 11 is adapted thereto, the aperture of the through hole 22 is larger than the outer diameter of the rod 11, and the end surface of the shell 21 is provided with a slot 24 for accommodating the head 12;

[0028] When in use, the fixed member 5 is placed at one end of the housing 21 away from the slot 24, and then the body 1 is placed into the housing 21 from the other end, wherein the rod 11 enters the through hole 22, so that a gap 3 is formed between the outer wall of the rod 11 and the inner wall of the through hole 22; and the head 12 is placed in the slot 24, and then the screw passes through from the other side of the fixing member and is connected and fixed with the internal thread 13 of the rod 11. The force after the screw and the nut are fixed is described below;

[0029] First of all, it should be explained that a transversely extending flange portion 23 is provided at the bottom of the shell 21 to increase the force-bearing area; after the fixation is completed, the end of the flange portion 23 and the end face of the nut 42 of the screw respectively contact the end faces of both sides of the fixed part 5, and the screw rod 41 portion 11 of the screw is threadedly connected with the rod portion 11, and the lower end face of the head 12 is against the end face of the slot 24; it is further explained that the slot 24 can adopt a multi-deformation design to achieve a clamping fixation with the head 12, or an embossing is provided at the position of the head 12 to form an interference fit with the slot 24, which can also achieve a clamping effect and provide a lever for screw locking.

[0030] At this time, the bottom surface D of the flange portion 23 forms a first fulcrum with the fixed part 5, and a second fulcrum is formed between the lower end surface f of the head 12 and the end surface F of the groove 24, so that the rod 11 is in a suspended state, and the end of the rod 11 does not contact the end surface of the fixed part 5, thereby avoiding the vibration and rotational force generated by the fixed part 5 to be directly transmitted to the rod 11; since the side wall of the rod 11 is relatively thin, when the external thread of the screw and the internal thread 13 of the rod 11 are tightened with each other, the thin side wall of the rod body is slightly deformed, and the force exerted on the thread is redistributed, so that the stress is transferred toward the head 12. After the head 12 is stressed, the clamping force is transmitted downward and dispersed to the suspended thread part. The suspended part of the thread is stressed, which lengthens the stress clamping length, thereby avoiding the clamping force being concentrated on the 1-3 circles of the internal thread 13 fastener and the clamped part, effectively preventing fatigue caused by stress concentration.

[0031] When the external thread and the patented product are tightened together, since the rod diameter of the main body 1 is in a suspended state, it can swing in the direction of the lateral load, so that the internal thread 13 of the main body 1 can fit with the screw, controlling the slippage between the internal and external threads, thereby preventing the fastener connection pair from rotationally loosening.

[0032] When the external thread of the screw and the internal thread 13 of the rod 11 are tightened together, the thin wall of the suspension nut and the gap 3 structure lengthen the stress clamping length. During the swinging process of the screw, the internal thread 13 can be effectively fastened to the external thread, and the suspension gap 3 structure effectively avoids the vibration reverse stress.

[0033] In the embodiment of the utility model, an outwardly protruding step 14 is provided between the rod 11 and the head 12, and the outer wall of the step 14 fits the inner wall of the through hole 22. The relative position of the rod 11 during the passage is fixed by the mutual cooperation between the step 14 and the through hole 22.

[0034] In the embodiment of the utility model, the outer radius a of the rod 11 is 1.1-1.35 times the distance from the inner thread 13a' to the center; the inner thread 13 of the thin-walled suspension structure body 1 can be stretched when subjected to force.

[0035] In the embodiment of the utility model, the thickness e of the head 12 is 1.5-3 times of the pitch L of the internal thread 13; the head and the groove have sufficient supporting points for contact.

[0036] In the embodiment of the utility model, the total height of the body 1 is h, the thickness of the head 12 is e, the total height of the shell 21 is H, the thickness of the slot 24 is E, he<HE; the body rod is suspended and cannot contact the locking member surface.

[0037] In the embodiment of the utility model, the size of the gap 3 formed between the outer diameter of the rod 11 and the through hole is 0.8-1.5 times the pitch L of the internal thread 13, so that a gap is formed between the two for the deformation of the rod.

[0038] In the embodiment of the utility model, the side of the head 12 close to the rod 11 is designed as an inclined surface, and the angle b formed between the surface and the rod 11 is 101°-103°, and the end surface of the groove 24 is adapted to the inclined surface.

[0039] It is obvious to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the present invention can be implemented in other specific forms without departing from the spirit or essential features of the present invention. Therefore, the embodiments should be regarded as exemplary and non-restrictive from any point of view, and the scope of the present invention is defined by the appended claims rather than the above description, and it is intended that all changes falling within the meaning and scope of the equivalent elements of the claims be included in the present invention. Any reference numeral in a claim should not be regarded as limiting the claim to which it relates.

[0040] In addition, it should be understood that although the present specification is described according to implementation modes, not every implementation mode contains only one independent technical solution. This description of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment may also be appropriately combined to form other implementations that can be understood by those skilled in the art.

Claims

1. A suspension type anti-loosening nut, characterized in that: It comprises a body (1) and a shell (21); The body (1) comprises a rod (11) and a head (12); the rod (11) is provided with an internal thread (13) for fixing; the housing (21) is provided with a through hole (22) for the rod (11) to pass through; the through hole (22) has a diameter larger than the outer diameter of the rod (11), so that a gap (3) is formed between the two for the rod (11) to deform; The end surface of the shell (21) is provided with a slot (24) for accommodating the head (12).

2. The suspension type structure anti-loosening nut according to claim 1, characterized in that: An outwardly protruding step (14) is provided between the rod portion (11) and the head portion (12), and the outer wall of the step (14) is in contact with the inner wall of the through hole (22).

3. The suspension type structure anti-loosening nut according to claim 2, characterized in that: The outer radius of the rod (11) is 1.1-1.35 times the distance from the inner thread (13) to the center.

4. The suspension type structure anti-loosening nut according to claim 3, characterized in that: The thickness of the head (12) is 1.5-3 times the pitch of the internal thread (13).

5. The suspension type structure anti-loosening nut according to claim 4, characterized in that: The total height of the main body (1) is h, the thickness of the head (12) is e, the total height of the shell (21) is H, the thickness of the slot (24) is E, and he<HE.

6. The suspension type structure anti-loosening nut according to claim 5, characterized in that: The size of the gap (3) formed between the outer diameter of the rod (11) and the through hole diameter is 0.8-1.5 times the pitch of the internal thread (13).

7. The suspension type structure anti-loosening nut according to claim 6, characterized in that: The side of the head (12) close to the rod (11) is designed as an inclined surface, and an angle of 101°-103° is formed between the inclined surface and the rod (11), and the end surface of the groove (24) is adapted to the inclined surface.

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