CN221525326U - Fastening mechanism - Google Patents

Abstract

The present utility model provides a fastening mechanism comprising: the bolt comprises a head and a screw, and a first spline extending along the axial direction is arranged at one end of the screw, which is far away from the head; the nut comprises a nut body, a nut seat and a nut, wherein the nut body is suitable for being matched with an external assembling tool so as to be assembled on a screw rod; a washer configured in an annular configuration adapted to bear against the outer mounting body in response to a locking force provided by the nut; the anti-loosening piece is suitable for being sleeved between the part of the bolt, provided with the first spline, and the nut so as to lock the nut against the rotation of the bolt through the second spline, and limit the nut from loosening and backing relative to the bolt; wherein one of the first spline and the second spline is configured as a male spline and the other is configured as a female spline.

Description

Fastening mechanism

Technical Field

At least one embodiment of the utility model relates to the technical field of fastening mechanisms, in particular to a connecting sleeve group and a fastening mechanism.

Background

Bolts and nuts are a common type of fastening mechanism that is widely used in the fields of machinery, construction, vehicle manufacturing, etc. to connect together at least two external mechanisms.

To maintain the stability and firmness of the two connected mechanisms, how to release the bolts and nuts is the main subject of research. At present, the anti-loosening design of bolts and nuts mainly comprises the following modes. Firstly, by increasing the friction between the fastening mechanism and the mounting main body, such as a spring washer is arranged; secondly, designing screw threads of the bolt, for example, arranging screw threads with different screw directions to configure different nuts, so that the screw directions of the nuts are different to mutually support and press; thirdly, a self-riveting structure is formed by arranging connecting pieces between nuts and/or between nuts and washers.

However, the above three methods have some drawbacks in practical use, for example, the first method can only achieve the short-term anti-loosening effect; the second mode has higher requirements on the processing precision, the used materials, the installation mode and the like of the nuts and the threads, and has lower stability; the third mode can cause the connecting piece to deform when riveting certainly, is limited by the material used by the connecting piece, the stress born by the connecting piece, the fatigue of deformation positions and other factors, and also easily causes the structural damage of the fastening mechanism, so that the stability is lower.

Therefore, how to provide a fastening mechanism capable of preventing loosening of bolts and nuts for a long period of time is a technical problem to be solved.

Disclosure of utility model

In order to solve at least one technical problem in the prior art and other aspects, the utility model provides a fastening mechanism, wherein a locking piece is suitable for locking the axial rotation of a bolt relative to a nut, and can prevent the nut from loosening and backing relative to the bolt for a long time so as to maintain the stability of the fastening mechanism.

The present utility model provides a fastening mechanism comprising: the bolt comprises a head and a screw, wherein one end of the screw, which is far away from the head, is provided with a first spline extending along the axial direction; the nut comprises a nut body, a nut seat and a nut, wherein the nut body is suitable for being matched with an external assembling tool so as to be assembled on the screw; a washer configured in a ring-shaped structure adapted to be pressed against an external mounting body in response to a locking force provided by the nut; and a locking piece, wherein a through hole is formed in the middle of the locking piece, a second spline suitable for being matched with the first spline is formed on the inner wall of the through hole, the locking piece is suitable for being sleeved between the part of the bolt provided with the first spline and the nut, and the nut is locked against rotation relative to the bolt through the second spline so as to limit the nut from loosening and loosening relative to the bolt; wherein one of the first spline and the second spline is configured as a male spline, and the other is configured as a female spline.

According to an embodiment of the present utility model, the locking piece is provided with a narrow opening formed at one end of the through hole, and a flaring part with an inner diameter larger than that of the through hole is formed at the other end of the locking piece; wherein the narrow opening portion is adapted to be fitted over the outer side of the bolt, and the flare portion is adapted to be fitted over the outer side of the nut.

According to an embodiment of the present utility model, the nut further includes an extension portion formed at an end of the nut body facing the anti-loosening member, configured to protrude in an axial direction of the nut body, an outer wall of the extension portion being provided with a third spline; the inner wall of the expansion part is provided with a fourth spline which is suitable for being matched with the third spline; the flaring part is suitable for sleeving the outer side of the extension part so as to connect the nut and the anti-loose piece through the third spline and the fourth spline, and the anti-loose piece is limited to rotate relative to the nut.

According to an embodiment of the present utility model, the flared portion is adapted to be sleeved on an outer side of the nut body and is engaged with an outer wall of the nut body to limit rotation of the locking member relative to the nut.

According to an embodiment of the utility model, an end of the screw remote from the head is further provided with an annular groove extending in the circumferential direction; the fastening mechanism further comprises a clamping ring which is detachably arranged in the annular groove and is propped against one end of the anti-loose piece far away from the nut in the state of being assembled with the annular groove so as to lock the anti-loose piece on the bolt.

According to an embodiment of the present utility model, an end surface of the washer facing the mounting body is provided with a plurality of protruding anti-slip portions configured to be tightly pressed against the mounting body in response to a locking force provided by the nut and to be brought into point contact or line contact with the mounting body.

According to an embodiment of the present utility model, the anti-slip portion includes an anti-slip strip, and a plurality of the anti-slip strips are arranged in a scattering shape around a center of the gasket.

According to an embodiment of the present utility model, the nut further includes a flange portion formed at an end of the nut body facing the washer, configured to protrude in a radial direction of the nut body, the flange portion being provided with a plurality of first mounting holes at intervals in a circumferential direction; a plurality of second mounting holes are formed in the end face of the gasket, which faces the nut; the fastening mechanism further includes a stopper pin configured to pass through between the first mounting hole and the second mounting hole, and to lock the nut against rotation relative to the washer, so as to restrict the nut from being loosened relative to the washer.

According to an embodiment of the present utility model, the gasket is made of a magnetic material, and the limiting pin includes a magnet pin to be attracted into the second mounting hole.

According to an embodiment of the utility model, the first mounting hole and/or the second mounting hole are configured as threaded holes, and the limit pin comprises a screw.

According to the fastening mechanism provided by the utility model, the gasket arranged between the nut and the mounting main body is suitable for increasing the friction force between the nut and the mounting main body. The anti-loosening member provided with the second spline is matched with the first spline arranged on the bolt, so that the rotation of the anti-loosening member relative to the bolt is limited; and the anti-loose piece is also connected with the nut, so that the nut and the bolt are indirectly connected together, the rotation of the nut relative to the bolt is locked, and the nut is prevented from loosening relative to the bolt.

Drawings

Fig. 1 is a perspective view of a fastening mechanism according to an exemplary embodiment of the present utility model, wherein a shows the fastening mechanism in a top view and B shows the fastening mechanism in a bottom view;

FIG. 2 is an exploded view of a component of the fastening mechanism of the illustrative embodiment shown in FIG. 1;

FIG. 3 is a perspective view of a locking element and nut of a fastening mechanism of another illustrative embodiment; and

Fig. 4 is a view of the use of the fastening mechanism of the illustrative embodiment shown in fig. 3.

In the drawings, the reference numerals have the following meanings:

1. a bolt;

11. A first spline;

12. A screw;

13. a head;

14. an annular groove;

2. a clasp;

3. a locking piece;

31. a narrow mouth;

32. A second spline;

33. a flared portion;

4. A limiting pin;

5. a gasket;

51. a second mounting hole;

52. An anti-slip part;

6. A nut;

61. A flange portion;

62. A nut body;

63. A first mounting hole;

64. An extension; and

65. And a third spline.

Detailed Description

The present utility model will be further described in detail below with reference to specific embodiments and with reference to the accompanying drawings, in order to make the objects, technical solutions and advantages of the present utility model more apparent.

The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the utility model. The terms "comprises," "comprising," and/or the like, as used herein, specify the presence of stated features, steps, operations, and/or components, but do not preclude the presence or addition of one or more other features, steps, operations, or components.

All terms, including technical and scientific terms, used herein have the meaning commonly understood by one of ordinary skill in the art unless otherwise defined. It should be noted that the terms used herein should be construed to have meanings consistent with the context of the present specification and should not be construed in an idealized or overly formal manner.

Where a formulation similar to at least one of "A, B and C, etc." is used, such as "a system having at least one of A, B and C" shall be interpreted in the sense one having ordinary skill in the art would understand the formulation generally, for example, including but not limited to systems having a alone, B alone, C alone, a and B together, a and C together, B and C together, and/or A, B, C together, etc.

Fig. 1 is a perspective view of a fastening mechanism according to an exemplary embodiment of the present utility model, where a shows the fastening mechanism in a top view and B shows the fastening mechanism in a bottom view. Fig. 2 is an exploded view of the fastening mechanism of the exemplary embodiment shown in fig. 1.

The fastening mechanism provided by the embodiment of the utility model comprises a bolt 1, a nut 6, a washer 5 and a locking piece 3 as shown in fig. 1 and 2. The bolt 1 comprises a head 13 and a shank 12, the end of the shank 12 remote from the head 13 being provided with a first spline 11 extending in an axial direction. The nut 6 comprises a nut body 62 adapted to cooperate with an external assembly tool for assembly on the threaded rod 12. The washer 5 is constructed in an annular configuration adapted to bear against the outer mounting body in response to a locking force provided by the nut 6. The middle part of locking piece 3 is provided with the through-hole, and the inner wall of through-hole is provided with and is applicable to the second spline 32 with first spline 11 complex, and the locking piece is applicable to the cover and establishes between the part of bolt 1 that is provided with first spline 11 and nut 6 to through the rotation locking of second spline 32 with nut 6 for bolt 1, in order to restrict nut 6 to loosen and withdraw for bolt 1. One of the first spline 11 and the second spline 32 is configured as a male spline, and the other is configured as a female spline.

According to an embodiment of the present utility model, as shown in fig. 1, the locking piece 3 is provided with a narrow mouth 31 formed at one end of the through hole, and a flared mouth 33 having an inner diameter larger than that of the through hole formed at the other end of the locking piece 3. The narrow opening 31 is adapted to be fitted over the outer side of the bolt 1, and the enlarged opening 33 is adapted to be fitted over the outer side of the nut 6.

According to the embodiment of the present utility model, as shown in fig. 1 and 2, the nut 6 further includes an extension 64, the extension 64 being formed at an end of the nut body 62 facing the loosening prevention member 3, configured to protrude in the axial direction of the nut body 62, and an outer wall of the extension 64 being provided with a third spline 65. The inner wall of the flared portion 33 is provided with fourth splines adapted to cooperate with the third splines 65. The flared portion 33 is adapted to be sleeved on the outer side of the extension portion 64, so as to connect the nut 6 with the locking piece 3 through the third spline 65 and the fourth spline, so as to limit the rotation of the locking piece 3 relative to the nut 6.

In one illustrative embodiment, as shown in fig. 1 and 2, the nut body 62 includes, but is not limited to, any other structure configured as an outer hex structure, a quadrilateral structure, and a tool (e.g., a wrench) adapted to mate with an external assembly tool to transmit torque. Further, the outer diameter of the end of the screw 12 remote from the head 13 (the upper end as shown in fig. 1) is configured to be smaller than the diameter of the portion of the screw 12 provided with the external thread.

In an exemplary embodiment, referring to fig. 1 and 2, the lower portion of the locking piece 3 is configured in a cylindrical structure, and the upper portion of the locking piece 3 is configured in a frustoconical mechanism tapered from bottom to top such that the lower portion of the locking piece 3 forms a flared portion 33 and the upper portion thereof forms a narrow portion integrally formed with the flared portion 33. In detail, the fourth spline (not shown in the drawings, shielded by the locking member 3) is formed on the inner wall of the flared portion 33 in the axial direction (up-down direction in fig. 1 and 2). Further, a through hole is formed in the middle of the narrow opening portion 31, and the second spline 32 described above is formed on the inner wall of the through hole.

In an exemplary embodiment, as shown in fig. 1 and 2, the end of the shank 12 of the bolt 1 remote from the head 13 (the upper end as shown in fig. 1) is uniformly provided with first splines 11 in the circumferential direction. In detail, the first spline 11 includes a straight spline extending in an axial direction of the screw 12 (up-down direction as shown in fig. 1).

In an exemplary embodiment, as shown in fig. 1 and 2, an end of the nut body 62 facing the anti-loosening member 3 (an upper end as shown in fig. 1 and 2) forms an extension 64. In detail, the extension 64 is formed integrally with the nut body 62, and is configured to have a substantially circular tubular structure. Wherein the inner wall of the extension 64 is coplanar with the inner wall of the nut body 62 and has an integral internal thread with the nut body 62 for mating with the screw 12; the outer wall of the extension 64 is provided with fourth splines.

In such an embodiment, the anti-loosening member 3 may be sleeved in a state where the nut 6 and the bolt 1 are assembled in place. The expansion part 33 of the locking piece 3 is sleeved on the extension part 64 of the nut 6, so that the locking piece 3 and the nut 6 are connected together through the matching of a third spline 65 and a fourth spline (including but not limited to any one of clearance fit, tight fit and tight fit); the narrow portion of the locking element 3 is sleeved outside the screw 12, and the locking element 3 is connected with the bolt 1 by the second spline 32 and the first spline 11 of the screw 12, and the locking element 3 is used as a shaft connecting structure to connect the nut 6 and the bolt 1 (that is, in a state that the locking element 3 is assembled with the nut 6 and the bolt 1, the extending directions of the axes of the locking element 3, the nut 6 and the bolt 1 are overlapped and cannot rotate relatively).

On this basis, the circumferential rotation of the nut 6 relative to the bolt 1 is restricted, and then the axial movement of the nut 6 relative to the bolt 1 is also restricted by the threaded engagement of the nut 6 and the bolt 1, so that the self-locking of the nut 6 and the bolt 1 can be realized, and the nut 6 is prevented from loosening and loosening relative to the bolt 1.

Fig. 3 is a perspective view of a locking element and nut of a fastening mechanism of another illustrative embodiment. Fig. 4 is a view of the use of the fastening mechanism of the illustrative embodiment shown in fig. 3.

In another exemplary embodiment, as shown in fig. 3 and 4, the flared portion 33 is adapted to fit over the outer side of the nut body 62 and engage with the outer wall of the nut body 62 to limit the rotation of the locking element 3 relative to the nut 6.

In an exemplary embodiment, as shown in FIG. 3, the flared portion 33 is configured to fit over the upper end of the nut body 62. In detail, a cavity structure adapted to the external shape (such as an outer hexagonal structure, a quadrangular structure, and other structures) of the nut body 62 is provided in the flared portion 33, so that the nut body 62 is engaged with the locking piece in a state where the locking piece 3 is covered on the nut body 62, thereby realizing connection of the locking piece 3 and the nut 6.

In an exemplary embodiment, as shown in fig. 3, the inner wall of the flared portion 33 is provided with a plurality of quincuncial corner edges along the circumferential direction, wherein the number of quincuncial corner edges is configured as an integer multiple of the corners of the nut body 62 (for example, the nut body 62 is configured as an outer hexagonal structure, and 12 quincuncial corner edges may be configured), so that the edges of the quincuncial corner edges are pressed against the outer end surface of the nut body 62 in a state that the flared portion 33 is sleeved on the nut body 62.

In such an embodiment, the locking element 3 is assembled in a manner similar to the above-described embodiment (i.e., the embodiment shown in fig. 1 and 2), and the locking element 3 and the bolt 1 are coupled together by the second spline 32 and the first spline 11. The difference is that the flared portion 33 of the locking piece 3 is directly adapted to the external shape of the nut body 62 for connection. In this way, compared with the embodiment shown in fig. 1 and 2, there is no need to provide the extension 64 on the nut body 62, and there is no need to make splines on the locking element 3 and the extension 64, so that the difficulty in manufacturing the same can be reduced.

According to an embodiment of the utility model, as shown in fig. 1 to 4, the end of the screw 12 remote from the head 13 is also provided with an annular groove 14 extending in the circumferential direction. The fastening mechanism further includes a snap ring 2, and the snap ring 2 is detachably mounted in the annular groove 14 and is pressed against an end of the anti-loosening member 3 away from the nut 6 in a state of being assembled with the annular groove 14, so as to lock the anti-loosening member 3 on the bolt 1.

In an exemplary embodiment, as shown in fig. 2, an annular groove 14 is formed in the middle of the first spline 11 provided to the screw 12. Further, the retainer ring 2 is made of a material having a certain elasticity, and is provided with an opening on a side facing the screw 12 (left side as shown in fig. 2). Still further, the opening should be configured to be slightly smaller than the diameter of the portion of the screw 12 where the annular groove 14 is provided. In this way, in the state where the snap ring 2 is assembled with the annular groove 14, the snap ring 2 can pass through the position of the screw 12 where the annular groove 14 is provided with the maximum diameter by self elasticity and tightly held at the groove bottom of the annular groove 4 after passing, so as to prevent the snap ring 2 from falling off. It should be understood that embodiments of the present utility model are not limited thereto.

For example, the snap ring 2 may be interference fit within the annular groove 14.

For another example, the snap ring 2 may be configured as a hoop structure having a complete ring structure, so as to meet the requirement of firmness in the assembled state with the screw 12.

In such an embodiment, in a state that the to-be-loosened member 3 is sleeved between the screw 12 and the nut body 62, the retainer ring 2 is clamped in the annular groove 14, so that the retainer ring 2 is pressed against the end part of the loosening prevention member 3, and the loosening prevention member 3 is prevented from being separated from the screw 12, so that the limiting of the axial direction of the loosening prevention member 3 is realized.

According to the embodiment of the present utility model, as shown in fig. 1B, the end surface of the washer 5 facing the mounting body is provided with a plurality of protruding anti-slip portions 52 configured to be tightly pressed against the mounting body in response to the locking force provided by the nut 6 and to be brought into point contact or line contact with the mounting body.

According to an embodiment of the present utility model, as shown in fig. 1B, the anti-slip part 52 includes anti-slip strips, and a plurality of anti-slip strips are arranged in a scattering shape around the center of the gasket 5.

According to an embodiment of the present utility model, as shown in fig. 4, the anti-slip strip is configured to taper from one side toward the other side near the gasket body 2 so that the anti-slip strip makes line contact with the mounting body.

In one illustrative embodiment, as shown in FIG. 1B, the cross-section of the cleat includes, but is not limited to, being configured in a triangle-like or trapezoid-like configuration. In detail, the width of the end of the cleat connected to the washer 5 is configured to be greater than the width of the end remote from the washer 5. It should be understood that embodiments of the present utility model are not limited thereto.

For example, the cleat may be configured in an arcuate strip configuration (i.e., the cleat is configured in a semi-circular configuration in cross-section).

For another example, the skid-resistant portion 52 is configured as a hemisphere, a semi-ellipsoid, a cube, or any other convex structure suitable for increasing friction between the gasket body and the mounting body.

In such an embodiment, the nut 6 continuously presses against the washer 5 under the influence of an external assembly tool to provide the locking force. In a state where the washer 5 is in contact with the mounting body, the side of the washer 5 provided with the anti-slip portion 22 is maintained in the engaged state in response to a large friction force between the anti-slip portion 22 and the mounting body, and the position where the nut 6 is in contact with the washer 5 is smaller than the friction force between the anti-slip portion 52 and the mounting body, so that the rotation can be continued and the locking force can be continuously applied until the clamping force and/or the torque value required for the assembly is reached. The anti-slip part 52 increases friction force with the mounting main body under the positive pressure provided by the locking force, basically does not slide relative to the mounting main body, and is even pressed against the mounting surface of the mounting main body, so that the washer 5 and the mounting main body are under larger friction force for a long time, and further the nut 6 is effectively prevented from loosening and loosening relative to the bolt 1.

According to an embodiment of the present utility model, as shown in fig. 1 to 4, the nut 6 further includes a flange portion 61 formed at one end of the nut body 62 facing the washer 5, configured to protrude in a radial direction of the nut body 62, the flange portion 61 being provided with a plurality of first mounting holes 63 at intervals in a circumferential direction. The washer 5 is provided with a plurality of second mounting holes 51 on an end face thereof facing the nut 6. The fastening mechanism further includes a stopper pin 4 configured to pass between the first mounting hole 63 and the second mounting hole 51, so that the rotation of the nut 6 with respect to the washer 5 is locked to restrict the loosening of the nut 6 with respect to the washer 5.

In an exemplary embodiment, as shown in fig. 1 to 4, a plurality of first mounting holes 63 are provided on the flange portion 61 of the nut 6 at regular intervals in the circumferential direction. In detail, the first mounting hole 63 is a through hole penetrating the flange portion 61.

In an exemplary embodiment, as shown in fig. 2, a plurality of second mounting holes 51 are provided at positions of the gasket 5 corresponding to the first mounting holes 63 (i.e., orthographic projection positions in the thickness direction of the gasket (up-down direction as shown in fig. 2). In detail, the number of the second mounting holes 51 is configured to be greater than the number of the first mounting holes 63. And, on the basis of satisfying the strength requirement of the gasket, should be constructed to be denser and better.

In such an embodiment, the flange portion 61 of the nut 6 may be connected to the washer 5 by the stopper pin 4 in a state where the nut 5 reaches a clamping force and/or torque value required for assembly, thereby restricting circumferential rotation of the nut 6 with respect to the washer 5, thereby preventing the nut 6 from loosening with respect to the bolt 1, and allowing the nut 6 to continuously supply pressure to the washer 5 near the mounting body for a longer period of time.

According to an embodiment of the present utility model, as shown in fig. 1 to 4, the washer 5 is made of a magnetic material, and the stopper pin 4 includes a magnet pin to be attracted into the second mounting hole 51.

In an exemplary embodiment, the gasket 5 includes, but is not limited to, an alloy material formed from iron, cobalt, nickel, and other metals. Further, the stop pin 4 is a magnet pin, and when the nut 6 reaches the required clamping force and/or torque value, the first mounting hole 63 and the second mounting hole 51 are positioned relatively, and the magnet pin is inserted into the first mounting hole 63 and the second mounting hole 51, so that the magnet pin is tightly adsorbed to the bottom of the second mounting hole 51, and extends out of the second mounting hole 51 into the first mounting hole 63.

According to an embodiment of the present utility model, as shown in fig. 1 to 4, the first mounting hole 63 and/or the second mounting hole 51 are configured as screw holes, and the stopper pin 4 includes a screw.

In another exemplary embodiment, the first mounting hole 63 and the second mounting hole 51 are configured as threaded holes with the same rotation direction and thread pitch, and the limiting pin 4 is mounted by using a screw matched with the threaded holes, thereby being matched with the threads of the threaded holes.

It should be noted that, in the embodiments, directional terms, such as "upper", "lower", "front", "rear", "left", "right", etc., refer to the directions of the drawings only, and are not intended to limit the scope of the present utility model. Like elements are denoted by like or similar reference numerals throughout the drawings. Conventional structures or constructions will be omitted when they may cause confusion in understanding the present utility model.

The embodiments of the present utility model are described above. These examples are for illustrative purposes only and are not intended to limit the scope of the present utility model. Although the embodiments are described above separately, this does not mean that the measures in the embodiments cannot be used advantageously in combination. The scope of the utility model is defined by the appended claims and equivalents thereof. Various alternatives and modifications can be made by those skilled in the art without departing from the scope of the utility model, and such alternatives and modifications are intended to fall within the scope of the utility model.

Claims (10)

1. A fastening mechanism, comprising:

the bolt (1) comprises a head (13) and a screw (12), wherein one end of the screw (12) far away from the head (13) is provided with a first spline (11) extending along the axial direction;

-a nut (6) comprising a nut body (62) adapted to cooperate with an external assembly tool to be assembled on said threaded rod (12);

A washer (5) configured in an annular configuration adapted to bear against the external mounting body in response to a locking force provided by said nut (6); and

The anti-loosening device comprises an anti-loosening piece (3), wherein a through hole is formed in the middle of the anti-loosening piece (3), a second spline (32) which is suitable for being matched with the first spline (11) is arranged on the inner wall of the through hole, the anti-loosening piece is suitable for being sleeved between the part of the bolt (1) provided with the first spline (11) and the nut (6), and the nut (6) is locked against rotation of the nut (6) relative to the bolt (1) through the second spline (32) so as to limit loosening and loosening of the nut (6) relative to the bolt (1);

wherein one of the first spline (11) and the second spline (32) is configured as a male spline and the other is configured as a female spline.

2. The fastening mechanism according to claim 1, wherein one end of the anti-loose member (3) provided with the through hole forms a narrow opening portion (31), and the other end of the anti-loose member (3) forms a flared portion (33) having an inner diameter larger than that of the through hole;

Wherein the narrow opening part (31) is suitable for being sleeved outside the bolt (1), and the flaring part (33) is suitable for being sleeved outside the nut (6).

3. The fastening mechanism according to claim 2, wherein the nut (6) further includes an extension portion (64), the extension portion (64) being formed at an end of the nut body (62) facing the anti-loosening member (3) and configured to protrude in an axial direction of the nut body (62), an outer wall of the extension portion (64) being provided with a third spline (65);

The inner wall of the flaring portion (33) is provided with a fourth spline which is suitable for being matched with the third spline (65);

the flaring part (33) is suitable for being sleeved on the outer side of the extension part (64) so as to enable the nut (6) to be connected with the anti-loose piece (3) through the third spline (65) and the fourth spline, and therefore rotation of the anti-loose piece (3) relative to the nut (6) is limited.

4. Fastening mechanism according to claim 2, characterized in that the flared portion (33) is adapted to fit over the outer side of the nut body (62) and to engage with the outer wall of the nut body (62) to limit the rotation of the anti-loose element (3) relative to the nut (6).

5. The fastening mechanism according to any one of claims 1 to 4, characterized in that the end of the screw (12) remote from the head (13) is further provided with an annular groove (14) extending in the circumferential direction;

The fastening mechanism further comprises a clamping ring (2), wherein the clamping ring (2) is detachably arranged in the annular groove (14) and is pressed against one end, far away from the nut (6), of the anti-loose piece (3) in an assembled state with the annular groove (14), so that the anti-loose piece (3) is locked on the bolt (1).

6. Fastening mechanism according to any one of claims 1 to 4, characterized in that the end face of the washer (5) facing the mounting body is provided with a plurality of raised anti-slip portions (52) configured to be pressed tightly against the mounting body in response to the locking force provided by the nut (6) and to form a point or line contact with the mounting body.

7. The fastening mechanism according to claim 6, wherein the anti-slip portion (52) includes anti-slip strips, a plurality of which are arranged in a scattering-like manner around the center of the washer (5).

8. The fastening mechanism according to claim 6, wherein the nut (6) further includes a flange portion (61), the flange portion (61) being formed at an end of the nut body (62) facing the washer (5) and configured to protrude in a radial direction of the nut body (62), the flange portion (61) being provided with a plurality of first mounting holes (63) at intervals in a circumferential direction;

a plurality of second mounting holes (51) are formed in the end face of the gasket (5) facing the nut (6);

The fastening mechanism further comprises a limiting pin (4) which is configured to penetrate between the first mounting hole (63) and the second mounting hole (51) so that the rotation of the nut (6) relative to the washer (5) is locked, and the nut (6) is limited to loosen and retreat relative to the washer (5).

9. Fastening mechanism according to claim 8, characterized in that the washer (5) is made of a magnetic material, the stop pin (4) comprising a magnet pin to be attracted in the second mounting hole (51).

10. Fastening mechanism according to claim 8, characterized in that the first mounting hole (63) and/or the second mounting hole (51) are configured as threaded holes, the limit pin (4) comprising a screw.