Elastic thread lock nut

Abstract

An elastic thread locknut belongs to the technical field of fasteners and comprises a nut body, and a tooth-shaped inclined surface of a tightening back side of an internal thread of the nut body is an internal shrinkage tooth internal thread which is bent inwards and shrunk inwards; according to the internal shrinkage tooth internal thread, the included angle of the inclined faces on the two sides of the tooth form of the internal thread serves as a reference tooth form angle, on the basis of the reference tooth form angle and the distance from the tooth bottom to the tooth crest, a turning point is arranged at the position, away from the tooth crest by 20%-50%, of the tooth form back side face, and the angle from the turning point to the tooth bottom is turned inwards in an inclined mode to form a turning tooth form angle. An internal shrinkage is formed between the tooth bottom and the tooth-shaped inclined surface at the position, so that a gap is formed, and an internal shrinkage tooth internal thread is formed; the anti-loosening nut has the advantages that the tooth-shaped inclined face of the internal thread of the nut is provided with the internal shrinkage tooth internal thread, when the anti-loosening nut is used, the tooth tip portion of the external thread is elastically deformed, meanwhile, the external thread of a screw rod is also deformed, and therefore the internal thread and the external thread are tightly locked with each other, and the purpose of preventing loosening is achieved.

Description

Technical Field

[0001] The utility model belongs to the technical field of fasteners, in particular to an elastic thread anti-loosening nut. Background Art

[0002] Commonly used fasteners include bolt-nut assemblies, stud-nut assemblies, screws, studs, etc., in which the nut is a polygonal cylinder with a central threaded hole. The inner ring wall of the central threaded hole is provided with an internal thread, which is tightened with the external thread on the stud to fasten and connect two or more fasteners with through holes.

[0003] The fastening of nuts and bolts is generally quite stable. However, if the fasteners are subject to long-term vibration, a difference in vibration frequency will occur between the fasteners, causing a certain amount of displacement between the fasteners in the connection structure, resulting in a loose connection between the nut and the stud, or even falling off. Therefore, after long-term research, the applicant has developed a series of anti-loosening nuts and has previously applied for a series of patents. However, the series of patented products previously applied for are complicated to use and difficult to produce, making them inconvenient for practical application. This solution is a further improvement on the multiple technical solutions previously developed by the applicant. Utility Model Content

[0004] The technical problem to be solved by the present invention is to address the above-mentioned defects and provide a nut with an inwardly retracted internal thread, so that when the nut is tightened, the external thread on the screw is pressed and elastically deformed and embedded in the retracted position of the internal thread, and at the same time, the tooth top of the internal thread of the nut is elastically deformed, thereby clamping the internal thread and the external thread to each other and achieving the purpose of preventing them from loosening.

[0005] In order to solve the above technical problems, the technical solution adopted by the utility model is an elastic thread anti-loosening nut.

[0006] It includes a nut body, and the tooth-shaped inclined surface on the tightening back side of the internal thread of the nut body is an inward-retracted internal thread, that is, the tooth bottom direction of the tooth-shaped inclined surface on the tightening back side of the internal thread of the nut body turns inward and retracts, forming an inward-retracted internal thread with an inward-retracted structure at the tooth bottom position.

[0007] Specifically, the internal thread of the shrinking tooth is based on the angle between the inclined surfaces on both sides of the tooth profile of the internal thread as the reference tooth profile angle, and the tooth profile inclined surface where the reference tooth profile angle is located is the reference tooth profile inclined surface. The tooth profile inclined surface on the tightening side of the internal thread of the nut is called the tooth profile positive side surface, and the other side is called the tooth profile back side surface. On the basis of the reference tooth profile inclined surface, based on the distance from the tooth bottom to the tooth top, a turning point is set at a position 20%-50% away from the tooth top on the tooth profile back side surface, and the inclined surface from the turning point to the tooth bottom is tilted inward to form a turning tooth profile inclined surface, so that the angle between the turning tooth profile inclined surface and the reference tooth profile inclined surface is between 0.5 degrees and the tooth profile half angle of the reference tooth profile angle, forming an internal thread shrinking tooth, that is, the angle between the tooth profile inclined surface from the turning point to the tooth bottom position and the tooth profile positive side surface is reduced, so that the tooth The bottom and the tooth profile inclined surface at this position are retracted to form a gap, forming a thread with the tooth profile retracted on the back side, forming an internal thread with retracted teeth; when in use, the tooth profile positive side of the internal thread on the nut is used as the inner side of the tightening direction to be screwed into the screw. When it hits the fastener, continue to tighten, which will make the tooth profile positive side of the internal thread hit the external thread of the screw in full, and then make the external thread of the screw hit the tooth profile back side of the internal thread. Since only a small part of the tooth profile back side of the internal thread is close to the tooth tip and contacts the tooth bottom position of the external thread of the screw, the tooth tip part of the internal thread will be elastically deformed, and then the thread body of the external thread on the screw will be embedded in the retracted position of the internal thread of the nut, causing the external thread of the screw to deform as well, so that the internal and external threads are tightly locked with each other, achieving the purpose of preventing loosening.

[0008] Preferably, the included angle between the transition tooth profile bevel and the reference tooth profile bevel is in the range of 3° to 8°.

[0009] Ordinary nuts can be tightened in both directions and have no front or back side, but this type of anti-loosening nut with an inward-retracted internal thread needs to consider the front and back sides. If it is screwed in reverse, although it can be tightened, the anti-loosening effect cannot be achieved. For this reason, the front side of the tooth profile of the nut's internal thread can also be tilted inward so that the bottom of the tooth on the front side of the tooth profile also constitutes a turning tooth profile inclined surface, that is, both sides of the tooth profile of the nut's internal thread are set to inward-retracted internal threads.

[0010] In addition, when only one side is provided with an internal thread, the present invention provides a flange seat on the nut body.

[0011] One side of the flange seat is used as the back side of the tooth shape, and the back side of the tooth shape is set to an internal thread with an inward-retracted tooth, so that it will not be screwed backward during use.

[0012] Taking the 60° angle tooth profile as an example, when the reference tooth profile angle is 60 degrees, a turning point can be set at 1 / 3 of the distance from the tooth top. The position from the turning point to the tooth top is still the reference tooth profile bevel at a 60° angle. The bevel from the turning point to the tooth bottom turns inward to form a turning tooth profile bevel with an angle of 5° to the reference tooth profile bevel. It can also be made into a turning tooth profile bevel with any angle greater than 0.5° to 30°, not limited to 5°, so that the thread surface from the turning point to the tooth bottom forms an inwardly retracted structure, forming a 60°-1 / 3-5° type of retracted tooth internal thread. In this way, when tightened on the screw, the external thread on the screw can be embedded in the retracted position to form a mutually locking structure.

[0013] Taking a 55° tooth profile as an example, when the reference tooth profile angle is 55 degrees, a turning point can be set at 1 / 2 of the tooth top. The position from the turning point to the tooth top is still a 55° reference tooth profile bevel. The bevel from the turning point to the tooth bottom is turned inward to form a 5° angle with the reference tooth profile bevel to form a turning tooth profile bevel. It can also be made into a turning tooth profile bevel with any angle greater than 0.5° to 27.5°, not limited to 5°, so that the thread surface from the turning point to the tooth bottom forms an inwardly retracted structure, forming a 55°-1 / 3-5° type of inward-retracted internal thread.

[0014] In this way, when tightened on the screw, the external thread on the screw can be embedded in the retracted position to form a mutually locking structure.

[0015] The reference tooth angles in the above two examples are the tooth angles commonly used at present. In fact, the reference tooth angles can be made into any angle between 0°-90°, and the turning point can be set at any position between the tooth bottom and the tooth top. It can be made into any turning tooth angle between 0.5° and the tooth half angle of the reference tooth angle with respect to the reference tooth bevel. The reference tooth angle, turning point position and turning tooth angle structure on the internal thread of the nut within this range are all within the protection scope of this application.

[0016] The beneficial effect of the utility model is that an inward-turning and inward-retracting internal thread is provided on the tooth profile inclined surface on the tightening back side of the internal thread of the nut, which can cause the tooth tip part of the external thread to elastically deform during use, and at the same time, the thread profile of the external thread on the screw is embedded into the retracted position of the internal thread of the nut, so that the external thread of the screw is also deformed, so that the internal thread and the external thread are tightly locked with each other, achieving the purpose of preventing loosening. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic diagram of the overall structure of the elastic thread anti-loosening nut of the utility model.

[0018] Figure 2The utility model is a schematic diagram of the internal thread structure of the elastic thread anti-loosening nut of the utility model, which is a longitudinal section passing through the axial center line of the nut.

[0019] Figure 3 The utility model is a schematic diagram of a longitudinal section structure passing through the axis of the nut when the elastic thread anti-loosening nut is screwed onto the screw rod.

[0020] Figure 4 for Figure 3 This is a structural schematic diagram of one side of the longitudinal section of the elastic thread anti-loosening nut in the utility model, in which both sides of the internal thread are set as inward-retracting threads.

[0021] In the figure: 1. Nut body, 2. Internal thread, 3. Internal thread with internal reduction, 4. Reference tooth profile bevel, 5. Tooth profile front side

[0022] Surface, 6. Tooth profile back side, 7. Turning point, 8. Turning tooth profile inclined surface, 9. Flange seat, 10. Screw, 11. External thread. DETAILED DESCRIPTION

[0023] The present invention will be further described below with reference to the embodiments.

[0024] like Figure 1 、 Figure 2As shown, an elastic thread anti-loosening nut is made, including a nut body 1, and the tooth profile bevel on the back side of the internal thread 2 of the nut body 1 in the tightening direction is an inward-turning and inward-shrinking internal thread 3, that is, the tooth bottom direction of the tooth profile bevel on the back side of the internal thread 2 in the tightening direction of the nut body 1 turns inward and shrinks, forming an inward-shrinking internal thread 3 with an inward-shrinking structure at the tooth bottom position; specifically, the inward-shrinking internal thread 3 takes the angle between the bevels on both sides of the tooth profile of the internal thread 2 as the reference tooth profile angle, and the tooth profile bevel where the reference tooth profile angle is located The reference tooth profile bevel 4 is used as the reference tooth profile bevel. The tooth profile bevel on the tightening side of the internal thread 2 of the nut is called the tooth profile positive side 5, and the other side is called the tooth profile back side 6. On the basis of the reference tooth profile bevel 4, based on the distance from the tooth bottom to the tooth top, a turning point 7 is set at a position 20%-50% away from the tooth top on the tooth profile back side. The bevel from the turning point 7 to the tooth bottom is tilted inward to form a turning tooth profile bevel 8. Generally, the angle between the turning tooth profile bevel 8 and the reference tooth profile bevel 4 is set at a tooth profile angle of 0.5 degrees to the reference tooth profile angle. The angle between the half angle is within the range of the angle between the turning point and the tooth profile, so as to form an inward-retracted internal thread 3; that is, the angle between the tooth profile bevel from the turning point to the tooth bottom position and the tooth profile positive side surface 5 is reduced, so that the tooth bottom and the tooth profile bevel at this position are retracted and a gap appears, forming a thread tooth with the lower part of the tooth profile back side retracted, forming an inward-retracted internal thread 3; when in use, the tooth profile positive side surface 5 of the internal thread 2 on the nut is screwed into the screw rod 10 as the inner side of the tightening direction, and when it hits the fastener, continue to tighten, which will make the tooth profile positive side surface 5 of the internal thread 2 fully The outer thread 11 of the screw is pressed against the tooth-shaped back side 6 of the internal thread 2. Since only a small part of the tooth-shaped back side 6 of the internal thread 2 close to the tooth tip contacts the tooth bottom position of the outer thread 2 of the screw, the tooth tip part of the internal thread 2 will be elastically deformed, and the thread body of the outer thread 11 on the screw 10 will be embedded into the retracted position of the inner thread 2 of the nut, so that the outer thread 11 of the screw will also be deformed, so that the internal thread 2 and the outer thread 11 are tightly locked with each other to achieve the purpose of preventing loosening.

[0025] Furthermore, the tooth profile positive side surface 5 of the nut internal thread 2 is also tilted inward, so that the tooth bottom of the tooth profile positive side surface 5 also forms a turning tooth profile inclined surface 8, that is, the tooth profile of the nut internal thread 2 on both sides is set to an inward-retracted tooth internal thread 3.

[0026] In addition, when only one side is provided with an internal thread 3, a flange seat 9 is provided on the nut body 1, with one side of the flange seat 9 serving as the tooth-shaped back side 6, and the tooth-shaped back side 6 is provided with an internal thread 3, so that it will not be screwed backwards during use.

[0027] Example 1.

[0028] The existing standard thread profile angles are 60 degrees and 55 degrees. Taking the 60 degree angle as an example,

[0029] When the reference tooth profile angle is 60 degrees, a turning point 7 can be set at a position 1 / 3 away from the tooth top. The reference tooth profile bevel 4 at an angle of 60° is still maintained from the turning point 7 to the tooth top. The bevel from the turning point to the tooth bottom turns inward to form a turning tooth profile bevel 8 at an angle of 5° to the reference tooth profile bevel 4. It can also be made into a turning tooth profile bevel 8 with any angle greater than 0.5° to 30°, not limited to 5°, so that the thread surface from the turning point to the tooth bottom forms an inwardly retracted structure, forming a 60°-1 / 3-5° type of retracted tooth internal thread 3. In this way, when tightened on the screw 10, the tooth top position of the nut internal thread 2 will undergo elastic deformation, and the external thread 11 on the screw can be embedded in the retracted position to form a mutually locking structure.

[0030] Example 2.

[0031] Taking a 55° tooth profile as an example, when the reference tooth profile angle is 55 degrees, a turning point 7 is set at a position 1 / 2 away from the tooth top, and the reference tooth profile bevel 4 at an angle of 55° is still maintained from the turning point 7 to the tooth top. The bevel from the turning point 7 to the tooth bottom turns inward to form a turning tooth profile bevel 8 at an angle of 5° to the reference tooth profile bevel 4. It can also be made into a turning tooth profile bevel 8 with any angle greater than 0.5° to 27.5°, not limited to 5°, so that the thread surface from the turning point 7 to the tooth bottom forms an inwardly retracted structure, forming a 55°-1 / 3-5° type of retracted tooth internal thread 3. In this way, when tightened on the screw 10, the tooth top position of the nut internal thread 2 will undergo elastic deformation, and the external thread 11 on the screw can be embedded in the retracted position to form a mutually locking structure.

[0032] The reference tooth profile angles in the above two examples are the tooth profile angles commonly used at present. In fact, the reference tooth profile angle can be made into any angle between 0°-90°, and the turning point 7 can be set at any position between the bottom of the tooth and the top of the tooth. The turning tooth angle can be made into any angle between 0.5° and the tooth profile half angle of the reference tooth profile angle with respect to the reference tooth profile bevel 4. The reference tooth profile angle, turning point position and turning tooth profile angle structure on the internal thread of the nut within this range are all within the protection scope of this application.

Claims

1. An elastic thread anti-loosening nut, comprising a nut body (1), characterized in that The tooth profile bevel on the tightening back side of the internal thread (2) of the nut body (1) is an inward-turning and inward-retracting internal thread (3); the inward-retracting internal thread (3) takes the angle between the bevels on both sides of the tooth profile of the internal thread (2) as the reference tooth profile angle, and the tooth profile bevel where the reference tooth profile angle is located is the reference tooth profile bevel (4). The tooth profile bevel on the tightening side of the internal thread (2) of the nut is called the tooth profile front side (5), and the other side is called the tooth profile back side (6). On the basis of the reference tooth profile bevel (4), based on the distance from the tooth bottom to the tooth top, a turning point (7) is set at a position 20%-50% away from the tooth top on the tooth profile back side, and the bevel from the turning point (7) to the tooth bottom is tilted and turned inward to form a turning tooth profile bevel (8), thereby forming the inward-retracting internal thread (3).

2. The elastic thread lock nut according to claim 1, characterized in that The angle between the turning tooth profile bevel (8) and the reference tooth profile bevel (4) is between 0.5 degrees and the tooth profile half angle of the reference tooth profile angle.

3. The elastic thread lock nut according to claim 1, characterized in that The included angle between the transition tooth profile bevel (8) and the reference tooth profile bevel (4) is between 3 degrees and 8 degrees.

4. The elastic thread lock nut according to claim 2, characterized in that The tooth profile of the nut internal thread (2) is configured on both sides as an inward-retracted internal thread (3).

5. The elastic thread lock nut according to claim 3, characterized in that A flange seat (9) is provided on the nut body (1), with one side of the flange seat (9) serving as a tooth-shaped back side (6).

6. The elastic thread lock nut according to claim 4, characterized in that When the reference tooth profile angle is 60 degrees, a turning point (7) is set at a position 1 / 3 away from the tooth top, and the reference tooth profile bevel (4) at an angle of 60 degrees is still formed from the turning point (7) to the tooth top. The bevel from the turning point (7) to the tooth bottom is turned inward to form a 5° angle with the reference tooth profile bevel (4) to become a turning tooth profile bevel (8), so that the thread surface from the turning point (7) to the tooth bottom forms an inwardly retracted structure, forming a 60°-1 / 3-5° type of inwardly retracted tooth internal thread (3).

7. The elastic thread lock nut according to claim 5, characterized in that When the reference tooth profile angle is 55 degrees, a turning point (7) is set at a position 1 / 2 away from the tooth top, and the reference tooth profile bevel (4) at an angle of 55 degrees is still formed from the turning point (7) to the tooth top. The bevel from the turning point (7) to the tooth bottom is turned inward to form a 5° angle with the reference tooth profile bevel (4) to become a turning tooth profile bevel (8), so that the thread surface from the turning point (7) to the tooth bottom forms an inwardly retracted structure, forming a 55°-1 / 3-5° type of inwardly retracted tooth internal thread (3).

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