CN216241725U - Anti-dismantling fastener - Google Patents

Abstract

The utility model discloses an anti-dismantling fastener, which comprises an anti-dismantling nut and a dismantling sleeve; the anti-disassembly nut comprises a hexagonal nut body and an anti-disassembly convex part; six corners of the hexagonal nut main body are sharp corners, and one of two side edges of each sharp corner is a driving side; the anti-disassembly convex parts are correspondingly arranged on the driving side of each sharp corner part, and the anti-disassembly convex parts and the driving sides are connected into a whole to form a convex driving part; the dismounting sleeve is provided with a dismounting hole, the shape of the inner cavity of the dismounting hole is matched with the outer contour of the dismounting nut, so that the dismounting hole of the dismounting sleeve is sleeved with the dismounting nut, and the dismounting sleeve can be synchronously driven to rotate when rotated. The anti-disassembly convex part is a right triangle. The fastener has the advantages of high transmission efficiency, difficult slipping, reliable assembly and high disassembly prevention performance.

Description

Anti-dismantling fastener

Technical Field

The utility model belongs to the technical field of fastener manufacturing, and particularly relates to an anti-disassembly fastener of an automobile combined structure.

Background

Fasteners are a very widely used class of mechanical parts for fastening connections. A wide variety of fasteners are found on a variety of machines, equipment, vehicles, boats, railways, bridges, buildings, structures, tools, instruments, meters, supplies, and the like.

The conventional fastener has various driving modes, and because the product is mostly made of a round wire and the hexagonal driving mode can be screwed (loosened) in multiple directions, the driving mode of driving the conventional hexagonal nut by adopting the common hexagonal sleeve becomes the main fastener driving mode in the market. As shown in fig. 2, the conventional hexagonal socket 10 is easily worn out in the hexagonal driving structure of the conventional hexagonal socket 10 to the conventional hexagonal nut 20. As shown in fig. 1, the conventional hexagonal nut 20 has a 60 ° taper, one of two sides of the 60 ° taper is a driving side, and the driving side is a side on which the normal hexagonal sleeve 10 applies a force on the 60 ° taper when the normal hexagonal sleeve 10 is fitted into the conventional hexagonal nut 20. The 60 ° pointed portion of the conventional hexagon nut 20 has low efficiency in transmitting torque; and the sharp point 21 of the 60 deg. sharp corner of the conventional hexagonal nut 20 is stressed to be easy to slip. Therefore, the conventional hexagonal nut 20 generally has the disadvantages of poor assembly, short service life of the conventional hexagonal socket, and the like.

SUMMERY OF THE UTILITY MODEL

In order to solve the problems in the prior art, the utility model provides a disassembly-preventing fastener. The fastener is high in transmission efficiency, not easy to slip, reliable in assembly and high in disassembly prevention performance.

In order to achieve the purpose, the utility model adopts the following technical scheme:

a disassembly-preventing fastener comprises a disassembly-preventing nut and a disassembly-preventing sleeve; the anti-disassembly nut comprises a hexagonal nut body and an anti-disassembly convex part; wherein the content of the first and second substances,

six corners of the hexagon nut body are sharp corners, and one of two side edges of each sharp corner is a driving side; the anti-disassembly convex parts are correspondingly arranged on the driving side of each sharp corner part, and the anti-disassembly convex parts and the sharp corner parts are connected into a whole to form a convex driving part;

the dismounting sleeve is provided with a dismounting hole, the shape of the inner cavity of the dismounting hole is matched with the outer contour of the dismounting nut, so that the dismounting hole of the dismounting sleeve is sleeved with the dismounting nut, and the dismounting sleeve can be synchronously driven to rotate when rotated.

In the tamper-evident fastener as described above, the tamper-evident protrusion may be arc-shaped, square-shaped, triangular-shaped or polygonal-shaped.

The technical scheme provided by the above has the following beneficial effects:

firstly, the anti-disassembly nut is additionally provided with the anti-disassembly convex part on the driving side of the sharp corner part of the hexagon nut body, so that the outer contour of the anti-disassembly nut forms an unconventional hexagon, when the anti-disassembly nut is screwed out by using the conventional common hexagonal sleeve, an interference phenomenon can occur between the conventional common hexagonal sleeve and the anti-disassembly nut, and the anti-disassembly nut cannot be sleeved in the anti-disassembly nut, so that the anti-disassembly effect of the anti-disassembly nut is achieved.

Secondly, the anti-dismantling nut of the utility model must use the dismounting sleeve of the utility model, so that the anti-dismantling nut can be smoothly sleeved in the dismounting sleeve, and the assembly and the disassembly of the anti-dismantling nut are realized.

Thirdly, the six convex driving parts of the novel anti-dismounting nut are in face-to-face contact with the inner wall of the dismounting sleeve, so that the contact area is large, the stress is small, and the nut is not easy to wear and slide.

Fourthly, the anti-disassembly convex part can achieve the effect of improving the transmission rate by reducing the shape and the size of the convex driving part.

Drawings

The accompanying drawings, which are included to provide a further understanding of the utility model and are incorporated in and constitute a part of this specification, illustrate embodiments of the utility model and together with the description serve to explain the utility model and not to limit the utility model. In the drawings:

fig. 1 is a perspective view of a conventional hexagonal nut of the prior art;

FIG. 2 is a schematic perspective view of a conventional hexagonal socket of the prior art;

FIG. 3 is a schematic perspective view of the tamper nut of the present invention;

FIG. 4 is a schematic front view of a partially enlarged structure of the portion I of FIG. 3;

FIG. 5 is a schematic top view of a partially enlarged structure of the tamper nut of the present invention;

FIG. 6 is a schematic perspective view of the removable sleeve of the present invention;

FIG. 7 is a schematic cross-sectional view of the anti-removal nut of the present invention in cooperation with a conventional hexagonal socket of the prior art;

FIG. 8 is a schematic top view of the anti-removal nut of the present invention in cooperation with a conventional hexagonal socket of the prior art;

FIG. 9 is a schematic cross-sectional view of the anti-tamper nut of the present invention in cooperation with the sleeve;

FIG. 10 is a schematic top view of the anti-tamper nut of the present invention in cooperation with the sleeve;

FIG. 11 is a schematic perspective view of a removal nut of the present invention having a square removal prevention protrusion;

FIG. 12 is a schematic perspective view of a tamper nut having triangular tamper evident protrusions according to the present invention (the tamper evident protrusions shown in the drawings are in the form of right triangles);

FIG. 13 is a schematic cross-sectional view of a prior art conventional hex nut mated with a prior art conventional hex sleeve;

FIG. 14 is a schematic top view of a prior art conventional hex nut mated with a prior art conventional hex sleeve;

FIG. 15 is an enlarged schematic view of the drive side of a conventional prior art hex nut;

FIG. 16 is an enlarged view of the convex driving portion of the anti-tamper nut of the present invention with the anti-tamper convex portion being a right triangle;

FIG. 17 is an enlarged schematic view of a prior art conventional hexagonal nut tightened with a conventional hexagonal socket at the apex of the internal hexagonal point;

FIG. 18 is an enlarged view of the male drive portion of the present invention when the anti-removal nut and the removal sleeve are tightened.

Detailed Description

In order to make the technical problems, technical solutions and advantageous effects to be solved by the present invention clearer and clearer, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the utility model and are not intended to limit the utility model.

In the claims, the specification and the drawings of the present invention, unless otherwise expressly limited, the terms "first", "second" or "third", etc. are used for distinguishing between different items and not for describing a particular sequence.

In the claims, the specification and the drawings of the present invention, unless otherwise expressly limited, all directional or positional relationships indicated by the terms "center," "lateral," "longitudinal," "horizontal," "vertical," "top," "bottom," "inner," "outer," "upper," "lower," "front," "rear," "left," "right," "clockwise," "counterclockwise," and the like are based on the directional or positional relationships indicated in the drawings and are used for convenience in describing the present invention and for simplicity in description, but do not indicate or imply that the device or element so indicated must have a particular orientation or be constructed and operated in a particular orientation, and therefore should not be construed as limiting the scope of the present invention.

In the claims, the description and the drawings of the present application, unless otherwise expressly limited, the terms "fixedly connected" or "fixedly connected" should be interpreted broadly, that is, any connection between the two that does not have a relative rotational or translational relationship, that is, non-detachably fixed, integrally connected, and fixedly connected by other devices or elements.

In the claims, the specification and the drawings of the present invention, the terms "including", "having" and their variants, if used, are intended to be inclusive and not limiting.

Referring now to fig. 1 to 6, a tamper fastener according to the present invention is described, which includes a tamper nut a and a tamper sleeve B, wherein the tamper nut a includes a hexagon nut body 100 and a tamper protrusion 200.

Six corners of the hexagonal nut body 100 of the present invention are pointed corners 110, and a threaded hole 120 is formed in the center of the hexagonal nut body 100. One of the two sides of the sharp corner 110 is a driving side 111, and the driving side 111 is a side on which the dismounting sleeve B applies force on the sharp corner 110 when the dismounting sleeve B is sleeved into the hexagon nut body 100.

The detachment prevention protrusions 200 of the present invention are correspondingly provided on the driving side 111 of each pointed portion 110; preferably, the detachment prevention protrusion 200 is integrally connected to the driving side 111, so that the detachment prevention protrusion 200 is integrally connected to the acute angle portion 110 to form the convex driving portion 300 of the present invention.

The shape and size of the tamper-evident protrusion 200 of the present invention are preferably used for key features, but not limited to, arc, square (as shown in fig. 11), triangle (as shown in fig. 12), or polygon, etc., and the tamper-evident protrusion 200 shown in fig. 12 is a right triangle. The use of a reduced shape for the convex driving portion 300 is applicable to the tamper-evident projection 200 of the present invention. The anti-disassembly convex part 200 is designed according to different design requirements, mainly considering the shape and size of the convex driving part 300, the smaller the shape of the convex driving part 300 is, the higher the transmission efficiency is, the smaller the abrasion degree of the wrench is, and the longer the service life is.

The tamper-evident fastener of the present invention will now be described with the tamper-evident projection 200 being arcuate.

In this embodiment, as shown in fig. 3 to 5, the hexagon nut body 100 is a hexagon nut with 24-24.5 mm opposite sides, and a threaded hole 120 of M20 is formed in the middle of the hexagon nut body 100.

The detachment prevention protrusion 200 is arc-shaped. The bottom edge 210 of the anti-detachment convex portion 200 is integrally fitted to the driving side 110 of the sharp corner portion 110 to form a convex driving portion 300. In the present embodiment, the length of the driving side 111 of the sharp corner 110 is 2 to 4mm, that is, the length a1 of the bottom edge 210 of the anti-detachment convex portion 200 is 2 to 4 mm; taking the center of the nut as a circle center, taking the sharp point of the sharp corner part 110 as a starting point, wherein the radius R of the arc is A2, and A2 is 13.9-14.1 mm; the radius of the anti-disassembly convex part 200 and the arc chamfer of the outer wall of the hexagonal nut body 100 is A3, and A3 is 1.5-2.5 mm; the radius of the arc chamfer of the outer wall of the hexagonal nut body 100 on one side of the anti-disassembly convex part 200 and the sharp corner part 110 is A4, and A4 is 0.5-2 mm; the distance A5 from the top point of the anti-dismantling convex part 200 to the top point of the sharp corner part 110 is 0.3-1 mm; the radius R of the arc chamfer at the vertex of the anti-disassembly convex part 200 is A6, and A6 is 0.5-2 mm.

The convex driving portion 300 of the present embodiment forms an unconventional hexagon in the outer profile of the anti-disassembly nut a of the present invention, so that the nut a cannot be unscrewed using the conventional hexagonal sleeve 10 shown in fig. 2, and the nut a cannot be inserted using the conventional hexagonal sleeve due to the interference phenomenon of the X portion shown in fig. 7 and 8, thereby achieving the anti-disassembly effect.

The dismounting and mounting of the dismounting and mounting sleeve B of the utility model shown in figure 6 must be realized by the dismounting and mounting nut A of the utility model. The dismounting sleeve B of the utility model is provided with a dismounting hole 400, and the shape of the inner cavity of the dismounting hole 400 is matched with the outer contour of the dismounting nut A, so that the dismounting nut A is sleeved in the dismounting hole 400 of the dismounting sleeve B. As shown in fig. 9 and 10, when the dismounting sleeve B is rotated, the dismounting nut a can be synchronously driven to rotate, so that the dismounting and mounting of the dismounting nut a can be realized. Specifically, the dismounting hole 400 of the dismounting sleeve B is provided with six grooves 410, the inner contour shapes of the six grooves 410 are matched with the shape of the convex driving part 300, so that the convex driving part 300 can be avoided, the dismounting-preventing nut a can be smoothly sleeved in the dismounting sleeve B, and the assembling and the dismounting of the dismounting-preventing nut a are realized.

Referring now to fig. 12 to 18, in case of the disassembly prevention protrusion 200 having a right triangle as an example, the disassembly prevention nut a of the present invention is compared with the conventional hexagonal nut 20 to explain the driving angle problem and the advantage of adding the disassembly prevention protrusion.

As shown in fig. 15, when the conventional hexagonal nut 20 is screwed down on the conventional hexagonal socket 10, a force F perpendicular to the side surface of the nut is applied to a point B at the inner hexagonal apex of the conventional hexagonal nut 20, and at a moment of the force application, an acceleration a1 in the tangential direction of the hexagonal circumscribed circle is obtained, the point B at the inner hexagonal apex has a tendency of moving in the tangential direction of the circumscribed circle V1, and an included angle between a1 and F is a driving angle α 1, in the conventional hexagonal nut, α 1 is approximately equal to 60 °. The driving angle is the angle between the instantaneous speed and the stress.

As shown in fig. 16, when the dismounting sleeve B of the present invention is sleeved with the dismounting nut a of the present invention and is tightened, the point C at the top point of the right angle of the right-angle triangular dismounting-preventing projection 200 of the present embodiment is subjected to a force F perpendicular to the right-angle surface, at a moment of the force, an acceleration a2 in a tangential direction of a circle with the center of the dismounting nut a of the present invention as a center and the center to the point C as a radius is obtained, the point C at the top point of the right angle has a tendency V2 of moving in a tangential direction of a circumscribed circle, and an included angle between a2 and F is a driving angle α 2, α 2 is approximately equal to 30 °.

The two examples of F are decomposed into a direction a and a direction perpendicular to a. According to the cosine law, the smaller the driving angle α, the larger the component force resolved in the direction a, the larger the acceleration a, and the larger the transmission efficiency. In this example α 1/α 2 is 60 °: 30 °, cos α 1/cos α 2 ═ 1/√ 3, a1/a2 ═ 1/√ 3, and the acceleration increases by a factor of √ 3. The drive rate can be increased by reducing the drive angle alpha by shortening the CD or lengthening the CE (this method is only applicable to the case where the detachment prevention protrusion is a right triangle). Other conditions need to be specifically analyzed according to the condition of the anti-disassembly convex part and the size of the driving angle, and the aim of reducing the driving angle alpha is to achieve the effect of improving the transmission rate.

As shown in fig. 17, six sharp corners of the conventional hexagonal nut 20 are in point-to-point contact with the inner wall of the conventional hexagonal sleeve 10, so that the contact area is small, the stress is large, and the contact points are easy to crush, wear and slide. As shown in fig. 18, the six convex driving portions 300 of the anti-removal nut a are in face-to-face contact with the inner wall of the removal sleeve B, so that the contact area is large, the stress is small, and the nut is not easy to wear and slip.

The utility model is not limited to the fastener with the specification of the embodiment, and the outline dimension of the fastener can be changed according to actual requirements. The utility model is not limited to nuts, but also applicable to screws.

While the foregoing description shows and describes the preferred embodiments of the present invention, it is to be understood that the utility model is not limited to the forms disclosed herein, but is not intended to be exhaustive or to exclude other embodiments and may be used in various other combinations, modifications, and environments and is capable of changes within the scope of the inventive concept as expressed herein, commensurate with the above teachings, or the skill or knowledge of the relevant art. And that modifications and variations may be effected by those skilled in the art without departing from the spirit and scope of the utility model as defined by the appended claims.

Claims (2)

1. An anti-disassembly fastener is characterized by comprising an anti-disassembly nut (A) and a disassembly sleeve (B); the anti-disassembly nut (A) comprises a hexagonal nut body (100) and an anti-disassembly convex part (200); wherein the content of the first and second substances,

the hexagonal nut comprises a hexagonal nut body (100), wherein six corners of the hexagonal nut body (100) are sharp corners (110), and one of two side edges of each sharp corner (110) is a driving side (111);

anti-disassembly convex parts (200) are correspondingly arranged on the driving side (111) of each sharp corner part (110), and the anti-disassembly convex parts (200) and the sharp corner parts (110) are connected into a whole to form a convex driving part (300);

the dismounting sleeve (B) is provided with a dismounting hole (400), the shape of an inner cavity of the dismounting hole (400) is matched with the outer contour of the dismounting nut (A), so that the dismounting hole (400) of the dismounting sleeve (B) is sleeved with the dismounting nut (A), and when the dismounting sleeve (B) is rotated, the dismounting nut (A) can be synchronously driven to rotate.

2. The tamper-evident fastener as claimed in claim 1, wherein said tamper-evident projection (200) is of arcuate, square, triangular or polygonal shape.

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