Self-tightening Anti-loosening threaded fastening assembly

Abstract

A self-tightening anti-loosening threaded fastening assembly, comprising a bolt, a nut, and an elastic washer (93). A snap-fit structure (92) is provided on an end surface of the nut; a plurality of radial slots (J) are formed on the peripheral surface of the washer; a circumferential slot (Z) is formed on at least one side of the slot bottom of each radial slot; a strip portion defined by each radial slot and the circumferential slot on the corresponding side constitutes an upturned tab (K); the upturned tabs on the corresponding side are obliquely upturned toward the same side of the washer; the upturned tabs on the corresponding side are rotationally symmetrically distributed; the bolt is a second bolt (3B) without a groove; the snap-fit structure is at least one spiral ramp surface (P) provided close to the peripheral edge of at least one end face of the nut; the inner annular surface of the washer is a complete circular inner annular surface; when the nut is rotated in a loosening direction, the outer end of at least one upturned tab is displaced relative to the corresponding ramp surface toward the crest thereof; and an end face of the nut close to the central axis thereof is provided with limiting raised rings (7, 12). The self-tightening anti-loosening threaded fastening assembly has high reliability and low production costs.

Description

A self-tightening anti-loosening thread fastener kit Technical Field

[0001] This invention belongs to the field of standard parts technology and relates to a self-tightening anti-loosening thread fastening kit. Background Technology

[0002] Threaded fasteners are the most important category of standard parts and are widely used in various fields. Standardized threaded fasteners have many series of products, which usually include matching bolts, nuts and washers.

[0003] While threaded fasteners using this technology can certainly be used normally in various conventional applications, they are not suitable for applications with high vibration and frequent movement, such as high-speed rail tracks, where high reliability is required. Specially designed anti-loosening threaded fasteners must be used in these situations. Due to the large volume and high requirements, whether a product is suitable, while meeting the stringent anti-loosening technical requirements, must also consider manufacturing costs, installation and maintenance costs, and reliability.

[0004] Therefore, the inventor has proposed a technical solution disclosed in Chinese patent application No. 202421958985.4, entitled "An anti-loosening thread fastening kit that is easy to mass-produce," the structure of which is shown in Figures 1, 2, and 3. This anti-loosening thread fastening kit can basically achieve the technical objectives of preventing loosening and being easy to mass-produce, but it has the following shortcomings:

[0005] A. Because its anti-loosening principle is to prevent angular displacement between the bolt 3A and bolt 3A by cooperating with the positioning groove 6 on the bolt 3A and the positioning block 4 on the axle 5A, and then by using the pry bar K on the axle 5A to hold the anti-slip tooth 2 on the bottom surface of the nut 1A, thereby preventing angular displacement between the nut 1A and bolt 3A, once the original locking position between the pry bar K and the anti-slip tooth 2 becomes loose, it will further aggravate the loosening. Since there is no self-tightening function, the nut 1A and bolt 3A will also loosen further, and the reliability is not high enough.

[0006] B. Since a positioning groove 6 needs to be opened on bolt 3A, in addition to the increase in production cost, the mechanical strength of bolt 3A will also be affected to a certain extent, and it will be relatively difficult to replace and promote, and its reliability will also be affected to a certain extent.

[0007] In summary, the reliability of existing technologies is not high enough, the production cost is relatively high, and the effect of use is not ideal. Summary of the Invention

[0008] To overcome the shortcomings of existing technologies, this invention provides a self-tightening anti-loosening thread fastener kit, which has higher reliability and lower production costs.

[0009] The technical solution adopted by the present invention to achieve the above-mentioned technical objective is as follows: a self-tightening anti-loosening thread fastening kit, including a bolt, a nut, and an elastic washer; at least one end face of the nut is provided with a clamping structure; the elastic washer is a circular annular irregular washer formed by stamping a sheet of equal thickness, and multiple radial slits with a slit length less than the width of the washer ring are opened along the radial direction of the washer on the circumference of the washer. A circumferential slit is opened along at least one side of the washer circumferential direction with the bottom of the radial slit as the starting point. The corresponding L-shaped slits formed by the radial slits and the corresponding circumferential slits on the corresponding side divide the corresponding strip portion on the washer body. The corresponding side has a pry bar, which is tilted at an acute angle towards the same side of the washer. The pry bars on the corresponding side are symmetrically distributed about the center of the elastic washer. The bolt is a slotless bolt for the axial direction of the rod. The locking structure has at least one spiral-shaped gentle slope near the outer periphery on at least one end face of the nut. The inner ring surface of the elastic washer is a complete circle. When the nut is loosened, the outer end of at least one pry bar is displaced relative to the top of the corresponding gentle slope and is further pressed down by the gentle slope. The end face of the nut near the central axis has a limiting protrusion that is higher than all the slopes.

[0010] The nut is a type B nut, and at least one end face of the B nut has multiple gently sloping surfaces near the outer periphery that are rotationally symmetrically provided. The terminal top of each gently sloping surface is connected to the starting bottom of the adjacent gently sloping surface by a transition steep slope surface.

[0011] The nut is a C-nut, and at least one end face of the C-nut has a twisted annular gentle slope near the outer periphery. The slope of the annular gentle slope is half a circle rising and half a circle falling and closed at both ends.

[0012] The elastic gasket is a type B gasket. Multiple radial slits with a length less than the width of the circumference of the elastic gasket are formed on the circumference of the elastic gasket. A circumferential slit is formed along one side of the elastic gasket, starting from the bottom of the radial slit. The corresponding L-shaped slits formed by the radial slits and the circumferential slits divide the corresponding strips on the elastic gasket body to form a flap. The flaps are tilted at an acute angle towards the same side of the elastic gasket, and the flaps are distributed symmetrically about the center of the elastic gasket.

[0013] The elastic gasket is a C-type gasket. Multiple radial slits, each shorter than the width of the circumference of the elastic gasket, are formed along the radial direction of the circumference of the C-type gasket. Circumferential slits, designated A and B, are formed on both sides of the circumference of the elastic gasket, with the bottom of the radial slits as the starting point. The L-shaped slits formed by the radial slits and A circumferential slits create strip-shaped portions on the gasket body, forming A-type raised pieces. The L-shaped slits formed by the radial slits and B circumferential slits create strip-shaped portions on the elastic gasket body, forming B-type raised pieces. A-type raised pieces are angled upwards at an acute angle towards one side of the elastic gasket; B-type raised pieces are angled upwards at an acute angle towards the other side of the elastic gasket. The raised pieces on corresponding sides are rotationally symmetrically distributed about the center of the elastic gasket.

[0014] The beneficial effects of the present invention are as follows: due to the adoption of the above technical solution, the structure has a force feedback mechanism that increases friction force by self-force to prevent further loosening, thereby achieving self-tightening anti-loosening and higher reliability of anti-loosening; since the positioning groove 6 does not need to be opened on the bolt 3A, the reliability in strength is relatively higher, the production cost is relatively lower, and the use effect is more ideal. Attached Figure Description

[0015] The present invention will be further described below with reference to the accompanying drawings and embodiments. Wherein:

[0016] Figure 1 is a schematic diagram of a prior art anti-loosening thread fastening kit;

[0017] Figure 2 is an exploded perspective view of the present invention;

[0018] Figure 3 is a schematic diagram of the structure of nut 1B in this invention;

[0019] Figure 4 is a schematic diagram of the structure of the propylene gasket 5C in this invention;

[0020] Figure 5 is an omitted schematic diagram of the present invention;

[0021] Figure 6 is an exploded perspective view of the nut 1C selected in this invention;

[0022] Figure 7 is a schematic diagram of the structure of gasket 5B in this invention;

[0023] Figure 8 is a schematic diagram of the structure of the propylene gasket 5C in this invention;

[0024] Figure 9 is a schematic diagram of the DIN gasket structure in this invention;

[0025] Figure 10 is a schematic diagram of the assembly state of the self-tapping screw in this invention;

[0026] Figure 11 is an exploded three-dimensional view of Figure 10;

[0027] Figure 12 is a schematic diagram of the 8B screw head structure in this invention;

[0028] Figure 13 is a schematic diagram of the assembly state of part B screw head 8B in this invention;

[0029] Figure 14 is an exploded perspective view of part 2b of the nail rod in this invention;

[0030] Figure 15 is an exploded perspective view of part 8C of the screw head in this invention;

[0031] Figure 16 is a schematic diagram of the 8C screw head structure in this invention;

[0032] Figure 17 is a schematic diagram of the assembly of another self-tapping screw part in this invention;

[0033] Figure 18 is a three-dimensional exploded view of Figure 17.

[0034] The markings and numbers in the attached diagram are explained as follows: Nut A 1A, Nut B 1B, Nut C 1C, Anti-slip tooth 2, Bolt A 3A, Bolt B 3B, Positioning block 4, Washer A 5A, Washer B 5B, Washer C 5C, Positioning groove 6, Limiting ring 7, Waist K, Waist A K1, Waist B K2, Radial slot J, Circumferential slot Z, Circumferential slot A Z1, Circumferential slot B Z2, Gentle slope P, Steep slope T, Washer D 5D, Nail A 2a, Nail B 2b, Seat 40, Plate 70, Screw head A 8A, Screw head B 8B, Screw head C 8C, Limiting ring 12, Self-tapping screw 9 Detailed Implementation

[0035] Example 1, as shown in Figures 4, 5, 7, and 9, describes a self-tightening anti-loosening threaded fastener kit, including a bolt, a nut, and an elastic washer. At least one end face of the nut is provided with a locking structure. The elastic washer is a circular, irregularly shaped washer formed by stamping a sheet of uniform thickness. Multiple radial slits J, each with a slit length less than the width of the ring portion of the elastic washer, are formed along the radial direction of the elastic washer. A circumferential slit Z is formed along at least one side of the elastic washer, starting from the bottom of the radial slit J. The corresponding L-shaped slits formed by the radial slits J and the corresponding circumferential slits Z on the elastic washer body separate corresponding L-shaped slits. The strip-shaped portion forms the corresponding side flaps, which are tilted at an acute angle towards the same surface of the washer. The flaps on the corresponding side are symmetrically distributed about the center of the elastic washer. The bolt is a slotless bolt 3B for the axial direction of the rod. The locking structure is that at least one spiral-shaped gentle slope surface P is provided on at least one end face of the nut near the outer periphery. The inner ring surface of the elastic washer is a complete circular inner ring surface. When the nut is loosened, the outer end of at least one flap is displaced relative to the top of the corresponding gentle slope surface P and is further pressed down by the gentle slope surface P. The end face of the nut near the central axis is provided with a limiting protrusion 7 that is higher than all slope surfaces.

[0036] The nut is a type B nut 1B. At least one end face of the B nut 1B has multiple gentle slopes P that are rotationally symmetrically arranged near the outer periphery. The terminal top of each gentle slope P is connected to the starting bottom of the adjacent gentle slope P by a transition steep slope T.

[0037] The elastic gasket is a gasket 5B. On the circumferential surface of the gasket 5B, there are multiple radial slits J with a slit length less than the width of the ring portion of the elastic gasket. Starting from the bottom of the radial slit J, a circumferential slit Z is formed along one side of the elastic gasket. The corresponding L-shaped slits formed by the radial slits J and the circumferential slit Z form corresponding strips on the elastic gasket body, which constitute a flap K. The flap K is tilted at an acute angle towards the same side of the gasket, and the flaps K are symmetrically distributed about the center of the elastic gasket.

[0038] Example 2, as shown in Figures 5, 6, and 10, and referring to Figures 4 and 7, describes a self-tightening anti-loosening threaded fastening kit, including a bolt, a nut, and an elastic washer. At least one end face of the nut has a locking structure. The nut is a type B nut 1B, which differs from Example 1 in that:

[0039] The gasket is a C gasket 5C. Multiple radial slits J, each with a length less than the width of the gasket's circumference, are formed along the radial direction of the gasket. Starting from the bottom of the radial slit J, two circumferential slits Z are formed along the circumference of the gasket, one being a type A circumferential slit Z1 and the other a type B circumferential slit Z2. The L-shaped slits formed by the radial slits J and Z1 create strip-shaped portions on the gasket body that form a type A raised piece K1. The L-shaped slits formed by the radial slits J and Z2 create strip-shaped portions on the gasket body that form a type B raised piece K2. The type A raised piece K1 is angled upwards at an acute angle towards one side of the gasket; the type B raised piece K2 is angled upwards at an acute angle towards the other side of the gasket. The raised pieces on corresponding sides are symmetrically distributed about the center of the gasket.

[0040] Example 3, as shown in Figures 8 and 9, is a self-tightening anti-loosening threaded fastener kit, including a bolt, a nut, and an elastic washer. At least one end face of the nut has a locking structure. The washer is a 5B washer. The difference from Example 1 is:

[0041] The nut is a C1 nut, and at least one of the C1 nuts has a twisted annular gentle slope P on its end face near the outer periphery. The slope of the annular gentle slope P is half a circle rising and half a circle falling and closed at both ends.

[0042] Example 4, as shown in Figures 6, 8, and 10, is a self-tightening anti-loosening threaded fastening kit, including a bolt, a nut, and an elastic washer; at least one end face of the nut is provided with a locking structure; the difference from Example 1 is:

[0043] The nut is a C1 nut, and at least one of the C1 nuts has a twisted annular gentle slope P on its end face near the outer periphery. The slope of the annular gentle slope P is half a circle rising and half a circle falling and closed at both ends.

[0044] The gasket is a C gasket 5C. Multiple radial slits J, each with a length less than the width of the gasket's circumference, are formed along the radial direction of the gasket. Starting from the bottom of the radial slit J, two circumferential slits Z are formed along the circumference of the gasket, one being a type A circumferential slit Z1 and the other a type B circumferential slit Z2. The L-shaped slits formed by the radial slits J and Z1 create strip-shaped portions on the gasket body that form a type A raised piece K1. The L-shaped slits formed by the radial slits J and Z2 create strip-shaped portions on the gasket body that form a type B raised piece K2. The type A raised piece K1 is angled upwards at an acute angle towards one side of the gasket; the type B raised piece K2 is angled upwards at an acute angle towards the other side of the gasket. The raised pieces on corresponding sides are symmetrically distributed about the center of the gasket.

[0045] Example 5, as shown in Figure 11 and referring to Figures 6 and 10, uses gasket D 5D, which differs from gasket C 5C in that: gasket A K1 is angled upwards in a V-shape towards one side of the gasket; gasket B K2 is angled upwards in a V-shape towards the other side of the gasket; the gaskets on corresponding sides are symmetrically distributed about the center of the gasket. The V-shaped design of the gaskets in this embodiment allows for greater elastic deformation, enabling them to be used with nut B 1B or nut C 1C for different applications.

[0046] Based on the same design concept of the present invention, the bolt of the present invention can be a self-tapping screw, wherein the bottom surface of the screw head is provided with the aforementioned clamping structure and is equipped with the aforementioned elastic washer, which can achieve the self-tightening and anti-loosening effect of the screwed structure.

[0047] Implementation 6, as shown in Figures 10-16, is a self-tightening anti-loosening screw fastening kit, including a self-tapping screw and an elastic washer; the self-tapping screw includes a shank and a screw head, and the bottom surface of the screw head is provided with a locking structure;

[0048] In this specific embodiment: the pre-installed fastener includes a plate 70 and a seat 40, which are secured with self-tapping screws. The top surface of the plate 70 is provided with a countersunk hole 71, and the bottom of the countersunk hole 71 is provided with a threaded through hole 72. The top surface of the seat 40 is also provided with a threaded countersunk hole 41. The lower part of the screw rod is screwed through the threaded through hole 72 and then screwed into the threaded countersunk hole 41. An elastic washer formed by one-time stamping of a plate of equal thickness is pressed between the bottom surface of the head and the bottom surface of the countersunk hole 71. The locking structure 81 on the bottom surface of the screw head is engaged with the elastic washer.

[0049] The elastic gasket has multiple radial slits J with a slit length less than the width of the gasket ring along its radial direction. A circumferential slit Z is formed along at least one side of the gasket, starting from the bottom of the radial slit J. The corresponding L-shaped slits formed by the radial slit J and the corresponding circumferential slit Z on the gasket body form corresponding strips that constitute the corresponding side flaps. The flaps on the corresponding side are tilted at an acute angle towards the same side of the gasket. The flaps on the corresponding side are symmetrically distributed about the center of the gasket.

[0050] The clamping structure is characterized by at least one spiraling gentle slope P on the bottom surface of the screw head near the outer periphery; the outer ring surface contour of the elastic washer is a complete circle when it is fully flattened; when the screw is loosened, the outer end of at least one pry bar is displaced relative to the top of the corresponding gentle slope P and is further pressed down by the gentle slope P; the bottom surface of the screw head near the central axis is provided with a limiting protrusion 12 that is higher than all the slopes.

[0051] The screw head is a type B screw head 8B. On the bottom surface of the type B screw head 8B, near the outer periphery, there are multiple gentle slopes P that are rotationally symmetrically arranged. The top of the terminal slope of each gentle slope P is connected to the bottom of the starting slope of the adjacent gentle slope P by a transition steep slope T.

[0052] The screw head is a C-type screw head 8C. On the bottom surface of the C-type screw head 8C, near the outer periphery, there is a twisted annular gentle slope P. The slope of the annular gentle slope P is half a circle rising and half a circle falling and closed at both ends.

[0053] The nail rod is nail rod 2a, and the body of nail rod 2a is a constant diameter screw structure.

[0054] The nail rod is nail rod 2b, and the bottom end of nail rod 2b is a self-tapping screw structure.

[0055] The elastic gasket can be the aforementioned gasket 5B, gasket 5C, or gasket 5D; the specific structure will not be described in detail.

[0056] During implementation, the screws used can be at least one of the following four types:

[0057] A, the combination of screw head 8B and nail rod 2a;

[0058] B, a combination of screw head 8B and nail rod 2b;

[0059] C, the combination of screw head 8C and nail rod 2a;

[0060] D, the combination of screw head 8C and nail rod 2b;

[0061] The elastic washers used can be matched with washers 5B, 5C, or 5D respectively from the above four screw types.

[0062] Different applications can be created by combining the screw head, shank, and washer in different ways.

[0063] As shown in Figures 14 and 15, and referring to Figures 10 and 11, Example 7 is a self-tightening anti-loosening thread fastening kit, including a screw 9 and an elastic washer 93; the bottom surface of the screw head 91 is provided with a clamping structure 92.

[0064] The locking structure 93 is similar to the locking structure 81 in the aforementioned embodiment 6, and will not be described in detail again;

[0065] The elastic gasket 93 has multiple radial slits with a length less than the width of the elastic gasket ring, extending radially outward from the inner hole of the gasket. A circumferential slit is formed along one side of the gasket's circumference, starting from the bottom of the radial slit. The corresponding L-shaped slits formed by the radial and circumferential slits divide the corresponding strips on the elastic gasket body, forming a flap K. The flap K is tilted at an acute angle towards the same side of the elastic gasket, and the flaps K are symmetrically distributed about the center of the elastic gasket.

[0066] Further description of the invention:

[0067] A. The working principle of the self-tightening anti-loosening mechanism is as follows: When this invention is applied, the entire bottom surface of the washer is pressed against the plane of the corresponding hole in a device. Although the middle part of the top surface of the washer is pressed by the limiting protrusion 7 on the bottom surface of the nut, the area of ​​the pry bar K on the outer ring of the top surface of the washer is only elastically pressed against the gentle slope surface P on the bottom surface of the nut. Therefore, the pressing area of ​​the bottom surface of the washer is larger, and the friction force is also greater. When loosening occurs, the nut and the washer will loosen first, so the washer will not loosen along with the nut. When the nut just begins to loosen slightly, at least one pry bar K (or pry bar K1 or pry bar K2) will be further pressed along the corresponding gentle slope surface P. The increased elasticity will automatically increase the friction force between the nut and the washer, preventing the nut from loosening further. There is a feedback mechanism of force that increases friction force by itself to stop further loosening, thereby realizing the self-tightening anti-loosening mechanism. However, once the initial locking position between the anti-loosening structure K and the anti-slip tooth 2 begins to loosen, the traditional anti-loosening structure will collapse completely.

[0068] B. The function of setting the limiting protrusion ring 7 is to prevent the nut from pressing the nut too tightly for a long time and losing its elasticity, causing the feedback mechanism to fail, and to limit the pressing distance between the nut and the nut on the washer.

[0069] C. The purpose of setting the nut and washer on both sides of the universal embodiment is that it is a kind of "foolproof design" when operated manually, and can simplify the positioning unit mechanism of the automatic installation mechanism when used in an automatic installation mechanism.

[0070] D. The sample of this invention has been tested by the "General Parts Product Quality Supervision and Inspection Center of China's national authoritative testing department" and a test report (Tongjianwei Zi No. 250807) has been issued. When it was submitted for testing, it was deliberately tested with requirements higher than the relevant standards. Even after applying grease, the residual / initial ratio still reached 98.9%.

[0071] E. Two embodiments using nut 1B are suitable for applications with higher requirements; two embodiments using nut 1C are suitable for applications with relatively lower requirements.

[0072] F, the "connection between the terminal slope top of each gentle slope surface P and the starting slope bottom of the adjacent gentle slope surface P through a transition steep slope surface T" can be a direct connection between adjacent slope ends, or it can be a transitional connection through the insertion of a moderately curved surface.

[0073] G. Since the present invention does not make any structural changes to the bolt, the present invention is easier to replace and promote.

[0074] H. This invention can make full use of traditional production lines for production. For the production of nuts, since non-standard clamping structures on the nuts need to be stamped out at the same time, the mold needs to be modified accordingly. The rest of the process is no different from the traditional nut production process. For the production of washers, steel coils are used as raw materials and can be produced continuously on traditional stamping production lines. When designing the mold, a combination mold can be used to form the punching and bending shape in one step. The produced bolts, nuts and washers can be heat treated in batches. Industrial applicability

[0075] This invention discloses a self-tightening anti-loosening thread fastener kit, which has a force feedback mechanism that increases friction to prevent further loosening, thereby achieving self-tightening anti-loosening with higher reliability. Since there is no need to open a positioning groove on the bolt, the reliability in terms of strength is relatively higher, the production cost is relatively lower, and it has good industrial applicability.

Claims

1. A self-tightening anti-loosening threaded fastening kit, comprising a bolt, a nut, and an elastic washer; at least one end face of the nut is provided with a locking structure; The elastic gasket has multiple radial slits with a length less than the width of the gasket ring along its radial direction. A circumferential slit is formed along at least one side of the gasket, starting from the bottom of the radial slit. The corresponding L-shaped slits formed by the radial slits and the corresponding circumferential slits on the gasket body form corresponding strips that constitute the corresponding side flaps. The flaps on the corresponding side are tilted at an acute angle towards the same side of the gasket. The flaps on the corresponding side are symmetrically distributed about the center of the gasket. The bolts mentioned are axially slotless bolts on the rod body; The clamping structure is that at least one spiral-shaped gentle slope is provided on at least one end face of the nut near the outer periphery; and a limiting protrusion ring higher than all the slopes is provided on the end face of the nut near the central axis. When the nut is loosened, the outer end of at least one of the pry bars is displaced relative to the top of the corresponding gentle slope and is further pressed down by the gentle slope.

2. The self-tightening anti-loosening threaded fastener according to claim 1, characterized in that: The nut is a type B nut, and at least one end face of the B nut has multiple gently sloping surfaces near the outer periphery that are rotationally symmetrically provided. The terminal top of each gently sloping surface is connected to the starting bottom of the adjacent gently sloping surface by a transition steep slope surface.

3. The self-tightening anti-loosening thread fastener according to claim 1, characterized in that: The nut is a C-nut, and at least one end face of the C-nut has a twisted annular gentle slope near the outer periphery. The slope of the annular gentle slope is half a circle rising and half a circle falling and closed at both ends.

4. A self-tightening anti-loosening threaded fastener according to claim 1, 2, or 3, characterized in that: The gasket is a type B gasket, which has multiple radial slits on its circumference with a length less than the width of the gasket's ring. Starting from the bottom of the radial slits, a circumferential slit is formed along one side of the gasket's circumference. The corresponding L-shaped slits formed by the radial and circumferential slits divide the corresponding strips on the gasket body, forming a flap. The flaps are tilted at an acute angle towards the same side of the gasket, and the flaps are distributed symmetrically about the center of the gasket.

5. A self-tightening anti-loosening threaded fastener according to claim 1, 2, or 3, characterized in that: The elastic gasket is a C-type gasket, which has multiple radial slits on its circumference with a length less than the width of the gasket's ring. Starting from the bottom of the radial slits, circumferential slits are formed on both sides of the gasket's circumference, creating a T-shaped slit. Correspondingly, the strip-shaped portions separated on the gasket body constitute A-type and B-type slits. A-type slits are turned up at an acute angle towards one side of the gasket, and B-type slits are turned up at an acute angle towards the other side of the gasket. The slits on the corresponding sides are rotated symmetrically about the center of the gasket.

6. A self-tightening anti-loosening threaded fastener according to claim 1, 2, or 3, characterized in that: The elastic gasket is a T-shaped gasket, which has multiple radial slits on its circumference with a length less than the width of the gasket ring. Starting from the bottom of the radial slits, circumferential slits are formed on both sides of the gasket, forming a T-shaped slit. Correspondingly, the strip-shaped portions separated on the gasket body form A-shaped and B-shaped slits. A-shaped slits are turned up in a V-shape towards one side of the gasket, and B-shaped slits are turned up in a V-shape towards the other side of the gasket. The slits on the corresponding sides are rotated symmetrically about the center of the gasket.

7. A self-tightening anti-loosening threaded fastener kit, comprising a screw and an elastic washer; a locking structure is provided on the bottom surface of the screw head; The elastic gasket has multiple radial slits with a length less than the width of the gasket ring along its radial direction. A circumferential slit is formed along at least one side of the gasket, starting from the bottom of the radial slit. The corresponding L-shaped slits formed by the radial slits and the corresponding circumferential slits on the gasket body form corresponding strips that constitute the corresponding side flaps. The flaps on the corresponding side are tilted at an acute angle towards the same side of the gasket. The flaps on the corresponding side are symmetrically distributed about the center of the gasket. The clamping structure has at least one spiraling, gently sloping surface near the outer periphery on the screw head surface; the outer ring surface contour is a complete circle when the gasket is fully compressed. When the screw is loosened, the outer end of at least one of the levers is displaced relative to the top of the corresponding gentle slope P and is further pressed down by the gentle slope P; the bottom surface of the screw head near the central shaft is provided with a limiting ring that is higher than all slopes.

8. A self-tightening anti-loosening threaded fastener according to claim 7, characterized in that: The screw head has a locking structure on its bottom surface, and the elastic washer adapted to it is a B washer, a C washer, or a D washer.

9. A self-tightening anti-loosening threaded fastener according to claim 7 or 8, characterized in that: The screw head is a type B screw head 8B. On the bottom surface of the type B screw head 8B, near the outer periphery, there are multiple gentle slopes P that are rotationally symmetrically arranged. The top of the terminal slope of each gentle slope P is connected to the bottom of the starting slope of the adjacent gentle slope P by a transition steep slope T.

10. A self-tightening anti-loosening threaded fastener according to claim 7 or 8, characterized in that: The screw head is a C-type screw head 8C. On the bottom surface of the C-type screw head 8C, near the outer periphery, there is a twisted annular gentle slope P. The slope of the annular gentle slope P is half a circle rising and half a circle falling and closed at both ends.

11. A self-tightening anti-loosening thread fastener according to claim 7, characterized in that: It also includes pre-installed fasteners, including plates and seats, which are secured with self-tapping screws; the top surface of the plate is provided with a countersunk hole, and the bottom of the countersunk hole is provided with a threaded through hole; the top surface of the seat is provided with a threaded countersunk hole; the lower part of the nail rod is screwed through the threaded through hole and screwed into the threaded countersunk hole; an elastic washer is pressed between the bottom surface of the head and the bottom surface of the countersunk hole; the clamping structure on the bottom surface of the screw head is engaged with the elastic washer. When the screw is loosened, the outer end of at least one of the levers is displaced relative to the top of the corresponding gentle slope P and is further pressed down by the gentle slope P; the bottom surface of the screw head near the central shaft is provided with a limiting ring that is higher than all slopes.

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