Self-locking fastening assembly

Abstract

The utility model discloses a self-locking fastening assembly. The self-locking fastening assembly comprises a nut and a gasket. The tightening end of the nut is provided with a conical boss, and the conical boss is provided with at least one open groove in the circumferential direction. The end, away from the nut, of the conical boss is provided with a strap. The center of the gasket is sequentially provided with a conical groove and an annular bundle groove in the axial direction. The nut and the gasket are suitable for being sequentially connected to the bolt in a sleeving mode to be tightened, then the conical boss is squeezed by the conical groove to shrink in the radial direction so as to be self-locked to the bolt, the binding belt extends to the annular binding groove to be locked and matched, and therefore the gasket and the nut are matched to form a pressing plate nut structure. The pressure plate bolt structure has the beneficial effects that the gasket extrudes the conical boss to achieve self-locking, and meanwhile the bridle and the gasket are locked and matched to form the pressure plate bolt structure. Compared with a traditional fastening kit, the self-locking fastening kit has the advantage that the structural rigidity of the fastening kit can be improved while self-locking is achieved.

Description

Technical Field

[0001] The present application relates to the technical field of fasteners, and particularly relates to a self-locking fastening assembly. Background Art

[0002] As Figure 1 shown, a common fastening kit is mainly composed of a nut 1, a gasket 2, and a bolt 3. The kit can be reliably connected together only after the nut 1 and the bolt 3 are tightened; after the tightening of the nut 1 is released, the nut 1 and the gasket 2 will spread apart. In the actual use process, as Figure 2 shown, the nut 1 and the gasket 2 can also be processed into a whole to form a pressing plate nut 4. The kit formed by the pressing plate nut 4 and the bolt 3 has good rigidity and can effectively distribute the contact specific pressure, belonging to a specific fastening kit. However, neither the common fastening kit nor the specific fastening kit has a self-locking function. There are also some solutions for self-locking design of the above-mentioned fastening kits in the prior art, and these solutions only achieve self-locking simply and cannot improve the structural rigidity of the common fastening kit. Summary of the Utility Model

[0003] One of the purposes of the present application is to provide a self-locking fastening assembly that can solve at least one defect in the above background art.

[0004] To achieve at least one of the above purposes, the technical solution adopted by the present application is: a self-locking fastening assembly, including a nut and a gasket; a conical boss is provided at the tightening end of the nut, and at least one opening groove is provided along the circumferential direction of the conical boss; a band is provided at the small end of the conical boss away from the tightening end of the nut, and a threaded hole extending to the band is provided at the center of the nut; a conical groove and an annular band groove are sequentially provided along the axial direction at the center of the gasket; the nut and the gasket are adapted to be sleeved on the bolt in sequence for tightening, and then the conical boss is radially contracted under the extrusion of the conical groove to be self-locked on the bolt, and the band extends into the annular band groove and is locked and matched, so that the gasket and the nut are combined to form a pressing plate nut structure.

[0005] Preferably, let the included angle of the conical groove be α2, and the friction angle of the band be α f ; when the nut and the gasket are tightened on the bolt, the included angle β between the outer side wall of the band and the vertical direction is less than or equal to the minimum value of α2 and α f in.

[0006] Preferably, when the band extends into the annular band groove, the annular band groove is in pressing fit with the outer side wall of the band through the position where it intersects with the conical groove.

[0007] Preferably, when the strap extends into the loop groove, the loop groove is in pressing fit with the outer sidewall of the strap at the position where it intersects with the conical groove and the position where the outer sidewall of the strap intersects with the conical boss.

[0008] Preferably, both the strap and the loop groove are of equal-diameter structure along their own axes.

[0009] Preferably, the loop groove is conical with an included angle of β, so that when the strap extends into the loop groove, the inner wall of the loop groove fits with the outer sidewall of the strap.

[0010] Preferably, the diameter of the small end of the conical groove is smaller than the diameter of the small end of the conical boss, and the included angle α1 of the conical boss is smaller than the included angle α2.

[0011] Compared with the prior art, the beneficial effects of this application are as follows:

[0012] By providing a conical boss and a strap on a common nut, when tightening with a bolt through a gasket, the conical boss can be driven to self-lock with the bolt by the extrusion of the gasket on the conical boss. At the same time, the strap can be in locking fit with the gasket, so that a pressing plate-bolt structure is formed between the gasket and the nut. Compared with traditional fastening kits, this application can achieve self-locking and improve the structural rigidity of the fastening kit. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 FIG. is a schematic structural diagram of a common fastening kit in the prior art.

[0014] Figure 2 FIG. is a schematic structural diagram of a specific fastening kit in the prior art.

[0015] Figure 3 FIG. is a schematic diagram of the overall structure of this application.

[0016] Figure 4 FIG. is a schematic diagram of the structure of the nut in this application.

[0017] Figure 5 FIG. is a schematic cross-sectional structure diagram of the gasket in this application.

[0018] Figure 6 FIG. is a schematic diagram of the state when the nut in this application just contacts the gasket.

[0019] Figure 7 FIG. is a schematic diagram of the state when the nut and the gasket in this application are tightened.

[0020] Figure 8 For this application Figure 7 The enlarged schematic diagram of the partial A in the middle.

[0021] Figure 9This is a partial structural schematic diagram showing the cooperation between another example of the circumferential binding groove and the binding band in the present application.

[0022] Figure 10 This is a partial structural schematic diagram showing the cooperation between yet another example of the circumferential binding groove and the binding band in the present application

[0023] Figure 11 This is a state schematic diagram showing the gasket being unlocked synchronously with the nut in the present application.

[0024] Figure 12 This is a structural dimension schematic diagram when the conical boss in the present application is self-locked.

[0025] Figure 13 This is a simplified equivalent view of the dimensions of the conical boss before and after self-locking in the present application.

[0026] In the figure: nut 1, conical boss 11, opening groove 110, binding band 12, gasket 2, conical groove 21, circumferential binding groove 22, bolt 3, press plate nut 4. Detailed implementation manners

[0027] Next, in combination with the detailed implementation manners, the present application will be further described. It should be noted that, on the premise of no conflict, the following described embodiments or technical features can be arbitrarily combined with each other to form new embodiments.

[0028] In the description of the present application, it should be noted that for orientation terms, such as terms "center", "horizontal", "vertical", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc., the indicated orientation and position relationship are based on the orientation or position relationship shown in the drawings. It is only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and should not be construed as limiting the specific protection scope of the present application.

[0029] It should be noted that the terms "first", "second", etc. in the description and claims of the present application are used to distinguish similar objects, and do not necessarily need to describe a specific order or sequence.

[0030] The terms "include" and "have" and any variations thereof in the description and claims of the present application are intended to cover non-exclusive inclusion. For example, a process, method, system, product or device that includes a series of steps or units does not necessarily have to be limited to those clearly listed steps or units, but may include other steps or units that are not clearly listed or are inherent to these processes, methods, products or devices.

[0031] One aspect of the present application provides a self-locking fastener assembly, such as Figures 3 to 11 As shown, one preferred embodiment includes a nut 1 and a gasket 2. A conical boss 11 is provided at the tightening end of the nut 1, and the conical boss 11 is provided with at least one open groove 110 along the circumferential direction; so that when the conical boss 11 is self-locked later, the open groove 110 can provide space for the deformation of the conical boss 11. A band 12 is provided at the small end of the conical boss 11 away from the tightening end of the nut 1, and a threaded hole extending to the band 12 is provided at the center of the nut 1. A conical groove 21 and an annular band groove 22 are sequentially provided at the center of the gasket 2 along the axial direction.

[0032] When the self-locking fastener assembly of the present application is used, the nut 1 and the washer 2 can be sequentially sleeved on the conventional bolt 3. As the nut 1 is screwed along the screw section of the bolt 3, the nut 1 gradually approaches the washer 2 until the nut 1 contacts the washer 2, for example. Figure 6 As shown, at this time, the nut 1 can contact the conical groove 21 of the gasket 2 through the band 12, and the gasket 2 has been pressed against the object to be fastened.

[0033] As the nut 1 continues to be screwed in, Figure 7 As shown, the band 12 is subjected to the extrusion force of the conical groove 21, which drives the conical boss 11 to shrink radially until the tightening end of the nut 1 abuts against the gasket 2. At this time, the conical boss 11 reaches the maximum deformation position to achieve radial compression with the bolt 3, and then the inner thread at the center of the conical boss 11 is radially squeezed with the outer thread of the bolt 3 to achieve self-locking. In addition, in the process of the conical boss 11 being screwed in with the nut 1, the conical boss 11 is pressed against the bolt 3 under the action of the extrusion force to generate radial tension resistance, which can form a resistance torque in the circumferential direction to achieve the integration of the nut 1 and the gasket 2 in the circumferential direction. Due to the presence of the open groove 110, the conical boss 11 is deflected inward after tightening, so that the circumferential size of the band 12 is reduced, until the band 12 passes over the conical groove 21 and is located in the annular groove 22 for locking fit. At this time, a structure similar to the pressure plate nut 4 can be formed between the gasket 2 and the nut 1.

[0034] When the self-locking fastening assembly of the present application and the bolt 3 need to be loosened, the nut 1 can be screwed in the opposite direction so that the nut 1 can be loosened for a distance, and the gasket 2 will follow the movement during this process, that is, the gasket 2 and the nut 1 are locked and move synchronously. Then, the gasket 2 and the nut 1 can be separated under the action of an external force to release the lock, for example, the gasket 2 can be knocked in the direction in which the gasket 2 and the nut 1 are separated. It should be noted that the self-locking of the bolt 3 and the nut 1 can be released under the action of an external force on the nut 1.

[0035] Compared with the traditional fastening kit, the self-locking fastening component of the present application can achieve self-locking through the nut 1, and can also combine the nut 1 and the gasket 2 to improve the structural rigidity; that is, while achieving fastening self-locking through the mutual cooperation of the traditional fastening kit, it can also achieve the structural performance of the specific fastening kit. Since the conical boss 11 of the nut 1 presses on the conical surface of the central conical groove 21 of the gasket 2, this will improve the coaxiality of the gasket 2, the nut 1 and the bolt 3, and the gasket 2 can be in centering contact with the object to be fastened, making the contact pressure balanced.

[0036] It should be known that the tightening end of the nut 1 is the end where the nut 1 abuts against the gasket 2 when the entire self-locking fastening component is tightened. The conical boss 11 is integrally arranged in a ring shape at the tightening end of the nut 1. In order to facilitate the radial contraction and tightening of the conical boss 11, the number of the opening grooves 110 can be set to be multiple. One specific example is as Figure 4 shown, the number of the opening grooves 110 is set to be four, and the four opening grooves 110 are equally spaced along the circumferential direction of the conical boss 11, which can effectively reduce the single-segment stiffness of the conical boss 11, and then can facilitate the extrusion fit with the conical groove 21 of the gasket 2 to generate radial bending to achieve the pressing contact with the bolt 3.

[0037] It should also be known that the bolt 3 cooperating with the self-locking fastening component of the present application can be an ordinary bolt, as long as it corresponds to the size of the nut 1 of the self-locking fastening component of the present application. The specific structure of the bolt 3 is well known to those skilled in the art, so it will not be elaborated in detail here.

[0038] It can be understood that there are various ways for the strap 12 to be locked and cooperated with the ring-shaped groove 22. For example, a clamping structure can be directly adopted to achieve locking, or a friction locking method can be used. Due to the limited size space of the strap 12 and the gasket 2, it may not be very convenient to set the clamping structure. If the sizes of the nut 1 and the gasket 2 are large enough, the clamping method can be adopted; while the friction locking method has little relation with the sizes of the strap 12 and the gasket 2, so the friction locking method is preferably adopted in this embodiment. The basic principle of achieving locking through friction is that the direction of the force is within the friction angle range. For the convenience of understanding, it will be described in detail through specific parameters below.

[0039] Specifically, as Figure 4 、 Figure 5 、 Figures 8 to 10 shown, it can be set that the oblique angle of the conical groove 21 is α2, and the friction angle of the strap 12 is α f . When the nut 1 and the gasket 2 are jointly tightened on the bolt 3, the included angle β between the outer side wall of the strap 12 and the vertical direction is less than or equal to the minimum value of α2 and α f .

[0040] It should be noted that, in order to ensure the stable cooperation between the strap 12 and the circumferential groove 22, when the self-locking fastening assembly of the present application is tightened, the angle β between the outer side wall of the strap 12 and the vertical direction should be less than the friction angle α of the strap 12. f . When the restoring force generated by the deformation of the conical boss 11 acts on the strap 12, the acting direction of this force is always within the friction angle α f . Furthermore, the locking stability between the strap 12 and the gasket 22 can be ensured.

[0041] Meanwhile, the value of the included angle α2 of the conical groove 21 can be selected according to actual needs. Therefore, theoretically, the included angle α2 can take any value less than 90°. If the value of the included angle α2 is also less than the friction angle α f , and the angle β between the outer side wall of the strap 12 and the vertical direction is greater than the included angle α2 and less than the friction angle α f , then the performance of the locking structure between the strap 12 and the circumferential groove 22 may be relatively poor at this time. Therefore, in order to further ensure the locking stability between the strap 12 and the circumferential groove 22, the value of the included angle β can be the minimum value of α2 and α f .

[0042] It can be understood that, from the above content, the locking connection between the gasket 2 and the strap 12 only needs to ensure the angle of the strap 12 after it extends into the circumferential groove 22, and there is no specific limitation on the cooperation structure between the strap 12 and the circumferential groove 22; then based on the aforementioned angular relationship, there are various specific cooperation structures between the strap 12 and the circumferential groove 22; for the convenience of understanding, two specific examples will be described in detail below.

[0043] Example 1: As Figure 8 shown, when the strap 12 extends into the circumferential groove 22, the circumferential groove 22 is in pressing fit with the position on the outer side wall of the strap 12 that intersects with the conical boss 11 through the position intersecting with the conical groove 21.

[0044] Example 2: As Figure 9 shown, the circumferential groove 22 is conical with an included angle β, so that when the strap 12 extends into the circumferential groove 22, the inner wall of the circumferential groove 22 fits with the outer side wall of the strap 12.

[0045] Example 3: As Figure 10 shown, when the strap 12 extends into the circumferential groove 22, the circumferential groove 22 is in pressing fit with any position on the outer side wall of the strap 12 through the position intersecting with the conical groove 21.

[0046] It can be understood that the above Example 1 can be regarded as a special case of Example 3. It should be noted that for the above Example 1 and Example 2, the outer sidewall of the conical boss 11 needs to be completely attached to the inner sidewall of the conical groove 21, while for the above Example 3, there is a certain gap between the outer sidewall of the conical boss 11 and the inner sidewall of the conical groove 21. Therefore, in order to ensure the stable force during the tightening of the nut 1, in this embodiment, the locking and mating method of the strap 12 and the circumferential groove 22 is preferably the above Example 1 or Example 2.

[0047] It can also be understood that according to the foregoing content, when the nut 1 and the gasket 2 are tightened, during the self-locking process of the nut 1 through the conical boss 11, the strap 12 needs to slide frictionally along the conical groove 21 through the end side. If the locking and mating method of the strap 12 and the circumferential groove 22 adopts the above Example 1, then during the entire tightening process, the frictional distance of the end side of the strap 12 is the hypotenuse length of the conical groove 21; if the locking and mating method of the strap 12 and the circumferential groove 22 adopts the above Example 2, then during the entire tightening process, the frictional distance of the end side of the strap 12 is the hypotenuse length of the conical groove 21 plus the hypotenuse length of the circumferential groove 22. Therefore, in order to reduce the wear of the strap 12 and the circumferential groove 22, the locking and mating method of the strap 12 and the circumferential groove 22 is further preferably the above Example 1.

[0048] In this embodiment, based on Example 1 of the locking and mating method of the strap 12 and the circumferential groove 22, there are also various specific structures of the strap 12 and the circumferential groove 22. For the convenience of understanding, a specific structure will be provided below for detailed description. As Figure 4 and Figure 5 shown, the strap 12 and the circumferential groove 22 are both equal-diameter structures along their own axes, which can facilitate the design and processing of the strap 12 and the circumferential groove 22. That is, the strap 12 is an overall cylindrical ring structure with an open slot 110, and the circumferential groove 22 is a circular groove structure. Thus, when the nut 1 and the gasket 2 are tightened, planar contact between the tightening end of the nut 1 and the end face of the gasket 2, conical contact between the outer sidewall of the conical boss 11 and the inner sidewall of the conical groove 21, and perpendicular contact between the strap 12 and the circumferential groove 22 can be achieved; through the surface contact in three directions, the contact stress concentration caused by the unevenness of the contact surface can be effectively eliminated, thereby protecting the contact surface from being damaged.

[0049] In this embodiment, as Figure 4 and Figure 5As shown, in order to ensure stable clamping between the nut 1 and the gasket 2, the major diameter of the conical boss 11 connected to the clamping end of the nut 1 should be less than or equal to the major diameter of the conical groove 21. At the same time, in order to ensure good coaxiality between the gasket 2 and the nut 1, it is preferably to set the major diameter of the conical boss 11 equal to the major diameter of the conical groove 21. From the foregoing content, it can be seen that in this embodiment, it is preferably that the hypotenuse dimension of the conical boss 11 is equal to the hypotenuse dimension of the conical groove 21. Therefore, the minor diameter of the conical groove 21 needs to be less than the minor diameter of the conical boss 11, and the oblique angle α1 of the conical boss 11 is less than the oblique angle α2. This can ensure that when the conical boss 11 undergoes radial contraction, the minor diameter of the conical boss 11 can be reduced towards the minor diameter of the conical groove 21, and at the same time, the oblique angle α1 of the conical boss 11 can be increased towards the oblique angle α2.

[0050] Another aspect of the present application provides a design method applied to the above self-locking fastening assembly. As Figure 12 shown, one preferred embodiment includes the following steps:

[0051] S100: Based on the material of the nut 1, obtain the friction angle α of the strap 12 f .

[0052] S200: Calculate the radial self-locking distance e required for self-locking with the bolt 3 based on the threaded hole structure of the nut 1.

[0053] S300: Determine the structure of the strap 12 and calculate the total height H of the conical boss 11 and the strap 12 according to the obtained radial self-locking distance e and friction angle α f .

[0054] S400: According to the obtained total height H, select a suitable height of the strap 12 and calculate the structural dimensions of the conical boss 11 and the central ring groove 22 of the gasket 2.

[0055] It should be known that the material of the nut 1 can be selected according to actual needs. After obtaining the material of the nut 1, the friction coefficient corresponding to the material of the nut 1 can be known. From the definition of the friction angle, the tangent value of the friction angle is equal to the friction coefficient. Therefore, through inverse deduction of the friction coefficient, the friction angle α of the strap 12 can be obtained f . It should be noted that the strap 12 and the nut 1 are integrally formed, so their materials and properties are the same.

[0056] Meanwhile, the self-locking of the nut 1 with the bolt 3 through the conical boss 11 can be regarded as an interference fit between internal and external threads; and the specific interference amount between the two is related to the structural dimensions of the nut 1. The specific value of the interference amount can be obtained by querying the tolerance table according to the dimensions of the nut 1. Assuming that the unilateral interference amount between the nut 1 and the bolt 3 is x, the calculation formula for the radial self-locking distance e in step S200 is as follows: e = D - d + x. Wherein, D represents the minor diameter of the external thread of the bolt 3, and d represents the minor diameter of the internal thread of the nut 1.

[0057] It can be understood that the structural design of the self-locking fastening component of the present application mainly designs the structural dimensions of the conical boss 11, the strap 12, and the conical groove 21 in the center of the gasket 2. The structural dimensions of the conical groove 21 are mainly related to the structural dimensions of the conical boss 11 and the strap 12; at the same time, the structural dimensions of the conical boss 11 are also related to the structural shape of the strap 12. Therefore, when performing step S300, it is necessary to first determine the specific structure of the strap 12. As can be seen from the foregoing content, the structure of the strap 12 is preferably an axially equal-diameter structure; for the convenience of understanding, the following will describe in detail the structural design process of the conical boss 11 for the axially equal-diameter strap 12.

[0058] Specifically, as Figure 12 and Figure 13 shown, since the internal thread of the nut 1 extends to the strap 12, when self-locking with the bolt 3, the radial self-locking distance e corresponds to the radial position difference of the end face of the strap 12 away from the conical boss 11 before and after tightening and self-locking. For the convenience of description, it can be defined that the position of the internal thread corresponding to the tightening end of the conical boss 11 of the nut 1 is a, and the front and rear positions of the strap 12 for calculating the radial self-locking distance e are b and c respectively, then an isosceles triangle abc as Figure 13 shown can be obtained; wherein, the side length ab corresponds to the position of the internal thread section that does not change in position before self-locking, and the side length ac corresponds to the position of the internal thread section that changes in position after self-locking.

[0059] It can be assumed that the total axial height of the conical boss 11 and the strap 12 is H, then the lengths of the side lengths ab and ac are both H. Since the position change of the outer side wall of the strap 12 is synchronized with the position change of the side length ab, ∠cab = β, and β represents the angle between the outer side wall of the strap 12 and the vertical direction when the nut 1 is tightened.

[0060] As Figure 13 shown, drawing a perpendicular line from point c to the side length ab, the perpendicular line cd can be obtained, and the length of the perpendicular line cd is the radial self-locking distance e. Then, according to the internal angle calculation formula of the triangle, ∠bcd = β / 2 can be obtained.

[0061] It can be assumed that the length of the side line bd is X, then based on the above parameter values, in △acd, there is:

[0062] tan∠cab = tanβ = e / (H - X).

[0063] Simplifying the above formula gives: X = H - e / tanβ = H - ecosβ / sinβ (1).

[0064] In △acd, we have: tan∠bcd = tanβ / 2 = X / e. Simplifying this gives: X = etanβ / 2 = e(1 - cosβ) / sinβ (2).

[0065] Combining formula (1) and formula (2), we can obtain: H = e / sinβ (3).

[0066] Since the value of the included angle β should be less than or equal to the friction angle α f , the calculation formula for the total height H can be changed to: H ≥ e / sinα f .

[0067] In the above formula, the radial self-locking distance e and the friction angle α f can be regarded as constants after the material and dimensions of the nut 1 are determined. Therefore, the value of the total height H only needs to be greater than or equal to the constant e / sinα f .

[0068] In this embodiment, step S400 includes the following specific steps:

[0069] S410: Determine the height H2 of the belt 12, and obtain the height H1 of the conical boss 11 = H - H2.

[0070] S420: Determine the oblique angle α1 of the conical boss 11, and calculate the large end diameter D1, small end diameter D2 and hypotenuse length L of the conical boss 11 based on the height H1 of the conical boss 11.

[0071] S430: Based on the oblique angle α1 of the conical boss 11, calculate to obtain the oblique angle α2 of the central conical groove 21 of the gasket 2 = α1 + β.

[0072] S440: Set the large end diameter d1 of the conical groove 21 = D1, and the hypotenuse length l of the conical groove 21 = L; based on the oblique angle α2 of the conical groove 21, further calculate the small end diameter d2 and axial depth h of the conical groove 21.

[0073] It should be noted that after obtaining the total axial height H of the strap 12 and the tapered boss 11, the specific heights of the strap 12 and the tapered boss 11 can be selected according to actual needs; for example, the height of the strap 12 can be taken as 10% - 20% of the height of the tapered boss 11. At the same time, the value of the bevel angle α1 of the tapered boss 11 can also be selected according to the actual needs of those skilled in the art. That is, when the total height H has been determined, the height H1 and the bevel angle α1 of the tapered boss 11 only need to cooperate with the tapered groove 21 on the gasket 2 to satisfy the formation of the radial self-locking distance e, and specific empirical values in the art can be taken.

[0074] When the height H1 and the bevel angle α1 of the tapered boss 11 are determined, the small end diameter D2 of the tapered boss 11 can be calculated as D2 = D0 + 2D', the large end diameter D1 = D2 + 2H1·tanα1, and the hypotenuse length L = H1 / cosα1. Among them, D0 represents the major diameter of the internal thread of the nut 1, and D' represents the thickness of the strap 12, and the specific values only need to meet the requirements of structural strength.

[0075] From the foregoing content, it can be seen that in order to ensure the coaxiality when the nut 1 and the gasket 2 are tightened together and reduce the wear between the strap 12 and the ring strap groove 22, the large end diameter d1 of the tapered groove 21 is set to D1, and the hypotenuse length l of the tapered groove 21 is set to L. Furthermore, all the structural dimensions of the tapered groove 21 of the gasket 2 can be calculated based on the known parameters, including the bevel angle α2 = α1 + β, the small end diameter d2 = d1 - 2Lsinα2, and the axial depth h = Lcosα2. For the structural design of the ring strap groove 22, from the foregoing content, it can be seen that the ring strap groove 22 is a circular groove, so the diameter of the ring strap groove 22 is equal to the small end diameter d2 of the tapered groove 21; the depth of the ring strap groove 22 can be selected according to actual needs, but it should be at least greater than or equal to the axial height H2 of the strap 12, so as to ensure that the strap 12 will not interfere with the object to be fastened when it extends into the ring strap groove 22.

[0076] The above describes the basic principle, main features and advantages of the present application. Those skilled in the art should understand that the present application is not limited by the above embodiments. What is described in the above embodiments and the specification is only the principle of the present application. Without departing from the spirit and scope of the present application, the present application will have various changes and improvements, and these changes and improvements all fall within the scope of the present application claimed. The scope of protection claimed by the present application is defined by the appended claims and their equivalents.

Claims

1. A self-locking fastening assembly, characterized in that: include: Nuts; The tightening end of the nut is provided with a conical boss, and the conical boss is provided with at least one open groove along the circumferential direction; the small end of the conical boss away from the tightening end of the nut is provided with a band, and the center of the nut is provided with a threaded hole extending to the band; and Gasket; the center of the gasket is provided with a cone groove and an annular beam groove in sequence along the axial direction; The nut and the gasket are suitable for being sequentially sleeved on the bolt for tightening, and then the conical boss radially contracts under the extrusion of the conical groove to self-lock with the bolt; the strap extends to the annular groove and is locked, so that the gasket and the nut cooperate to form a pressure plate nut structure.

2. The self-locking fastener assembly according to claim 1, characterized in that The bevel angle of the conical groove is α2, and the friction angle of the belt is α f ; When the nut and the washer are tightened on the bolt, the angle β between the outer side wall of the tie band and the vertical direction is less than or equal to α2 and α f The minimum value in .

3. The self-locking fastener assembly according to claim 2, characterized in that: When the strap extends to the annular groove, the annular groove is pressed and fitted with the outer side wall of the strap at a position intersecting with the conical groove.

4. The self-locking fastener assembly according to claim 3, characterized in that: When the strap extends to the annular groove, the annular groove is pressed and fitted with the position where the outer side wall of the strap intersects with the conical boss through the position where the annular groove intersects with the conical groove.

5. The self-locking fastener assembly according to claim 4, characterized in that: The strap and the annular strap groove are both equal-diameter structures along their own axial directions.

6. The self-locking fastener assembly according to claim 2, characterized in that: The concentric groove is in a cone shape with an oblique angle of β, so that when the strap is extended to the concentric groove, the inner wall of the concentric groove is in contact with the outer wall of the strap.

7. The self-locking fastener assembly according to any one of claims 2 to 6, characterized in that: The small end diameter of the tapered groove is smaller than the small end diameter of the tapered boss, and the bevel angle α1 of the tapered boss is smaller than the bevel angle α2.

Images