Connecting sleeve set and fastening mechanism

Abstract

The utility model provides a connecting sleeve set and a fastening mechanism. The connecting sleeve set comprises a nut and a gasket. Wherein the nut comprises a main body part and an extension part extending from the first axial end of the main body part, a first threaded hole suitable for being assembled with the bolt is formed in the main body part and the extension part in a penetrating mode, and an external thread is arranged outside the extension part. A second threaded hole is formed in the middle of the gasket and suitable for being assembled with the extending part. A first internal thread in the first threaded hole and a second internal thread in the second threaded hole have the same spiral direction, and the thread pitch of the first internal thread is larger than that of the second internal thread. The fastening mechanism comprises a connecting sleeve set and a bolt, and the bolt is provided with an external thread suitable for being matched with a nut of the connecting sleeve set.

Description

Technical Field

[0001] At least one embodiment of the present utility model relates to the technical field of fastening mechanisms, and more specifically, to a connection sleeve set and a fastening mechanism. Background Art

[0002] Bolts and nuts are a commonly used fastening mechanism and have wide applications in fields such as mechanical manufacturing, construction, aerospace, etc. Their main function is to connect two or more components to form an integral whole and bear various loads. With the development of technology, the structures, materials, and production processes of bolts and nuts are also continuously optimized to meet the requirements of different industries.

[0003] During the operation of mechanical equipment, the reliability of the connection between bolts and nuts is crucial. However, due to the influence of factors such as temperature changes, vibrations, and material creep, bolts and nuts are prone to preload relaxation when bearing loads for a long time. This phenomenon will lead to a decrease in the fastening force of the connecting parts and then loosening, affecting the normal operation and safety of the equipment. Therefore, researching and solving the problem of preventing bolts and nuts from loosening has always been a hot topic in the field of mechanical engineering.

[0004] In related technologies, the anti-loosening designs for bolts and nuts mainly include the following several methods. First, it is to increase the friction between the fastening mechanism and the installation main body, such as spring washers or lock washers; second, it is to perform special designs on the threads, such as wedge threads, elliptical threads, etc., to increase the friction between the thread pairs; third, it is to use locking agents or anti-loosening adhesives to form an adhesive force between the thread pairs to prevent the nut from rotating relative to the bolt. However, these methods all have deficiencies. For example, the anti-loosening effect of the first method is not ideal and can only produce effects in the short term; the processing and manufacturing cost of the second method is relatively high, and the installation and disassembly are somewhat difficult; the third method needs to consider many factors, such as compound stability, corrosion, etc. Therefore, how to provide a fastening mechanism that can prevent bolts and nuts from loosening for a relatively long time has become an urgent technical problem to be solved. Summary of the Utility Model

[0005] In view of this, the present utility model provides a connection sleeve set and a fastening mechanism. By threadedly connecting the washer and the bolt to the nut in the same rotation direction and configuring the bolt pitch to be greater than the washer pitch, the nut is prevented from loosening relative to the bolt, and the stability of the fastening mechanism is maintained.

[0006] To achieve the above object, the present utility model provides a connection sleeve set, including: a nut, including a main body portion and an extension portion extending from a first end in the axial direction of the main body portion, a first threaded hole adapted to be assembled with a bolt is provided through the main body portion and the extension portion, and an external thread is provided on the outside of the extension portion; a washer, a second threaded hole is formed in the middle of the washer, and is adapted to be assembled with the extension portion; wherein, the first internal thread in the first threaded hole and the second internal thread in the second threaded hole have the same helix direction, and the pitch of the first internal thread is greater than the pitch of the second internal thread.

[0007] In an exemplary embodiment, the surface of the washer facing the nut, and / or, the surface of the nut facing the washer is configured as a rough surface, and the average roughness Ra > 2μm.

[0008] In an exemplary embodiment, a plurality of protruding anti-slip portions are arranged on the surface of the washer facing the nut and the surface of the nut facing the washer, and the plurality of anti-slip portions are arranged at intervals in the circumferential direction.

[0009] In an exemplary embodiment, the height of the extension portion is less than the height of the washer.

[0010] In an exemplary embodiment, a dust-proof member is further included, which is arranged at the second end in the axial direction of the nut to close the first threaded hole.

[0011] In an exemplary embodiment, a clamping portion is provided on the inner side wall of the second end; the dust-proof member includes: a main body, which is fitted into the first threaded hole; a clamping member, which is arranged around the main body and is in clamping cooperation with the clamping portion.

[0012] In an exemplary embodiment, the clamping member is configured to extend axially from the end face of the main body and extend radially away from the main body to be in clamping cooperation with the clamping portion.

[0013] In an exemplary embodiment, the clamping portion is configured as an annular flange extending radially from the inner side wall of the second end to be clamped between the main body and the end of the clamping member.

[0014] In an exemplary embodiment, the clamping portion is configured as an annular groove formed on the inner side wall of the second end, so that the end of the clamping member is clamped in the annular groove.

[0015] The present utility model further provides a fastening mechanism, including: the connection sleeve set in any of the above embodiments; and a bolt, the bolt is configured with an external thread adapted to cooperate with the nut of the connection sleeve set.

[0016] The connection sleeve set and fastening mechanism provided by the present utility model thread the washer with the nut, causing the washer to press against the mounting body in response to the locking force provided by the nut. The pitch of the first internal thread of the nut is configured to be greater than the pitch of the second internal thread of the washer, and the rotation direction of the first internal thread is the same as that of the second internal thread to limit the loosening of the nut relative to the assembled bolt. Under the action of the assembly tool, the nut continuously presses against the washer to provide a locking force close to the mounting body until the clamping force and / or torque value required for assembly is reached. Since the rotation directions of the first internal thread and the second internal thread are the same, and the pitch of the first internal thread is greater than that of the second internal thread, if the nut rotates counterclockwise, i.e., in the loosening direction, the nut and the washer will move away from each other or tend to move away from each other, causing the washer to further abut against the mounting body, and the nut drives the bolt to squeeze the mounting body, thereby effectively preventing the nut from loosening relative to the bolt. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Through the following description of the embodiments of the present utility model with reference to the drawings, the above and other objects, features and advantages of the present utility model will become clearer. In the drawings:

[0018] Figure 1 is an exploded view of a connection sleeve set structure provided by the present utility model;

[0019] Figure 2 is Figure 1 an exploded view from another angle in the exemplary embodiment shown;

[0020] Figure 3 is Figure 1 the overall structure diagram of the exemplary embodiment shown;

[0021] Figure 4 is Figure 1 the overall architecture diagram from another angle in the exemplary embodiment shown;

[0022] Figure 5 is an exploded view of the second exemplary embodiment provided by the present utility model;

[0023] Figure 6 is Figure 5 an exploded view from another angle in the exemplary embodiment shown;

[0024] Figure 7 is an exploded view of the third exemplary embodiment provided by the present utility model;

[0025] Figure 8 is Figure 7 an exploded view from another angle in the exemplary embodiment shown;

[0026] Figure 9 is an exploded view of the fourth exemplary embodiment provided by the present utility model;

[0027] Figure 10 is Figure 9 an exploded view from another angle in the exemplary embodiment shown.

[0028] In the above-mentioned drawings, the meanings of the reference numerals are specifically as follows:

[0029] 1. Nut;

[0030] 11. Main body part;

[0031] 12. Extension part;

[0032] 13. First internal thread;

[0033] 14. External thread;

[0034] 2. Washer;

[0035] 21. Second internal thread;

[0036] 3. Dust-proof part;

[0037] 31. Body;

[0038] 32. Clamping part;

[0039] 4. Anti-slip part. Detailed implementation manners

[0040] To make the objectives, technical solutions and advantages of the present utility model clearer and more understandable, the present utility model will be further described in detail below with reference to specific embodiments and the accompanying drawings.

[0041] The terms used herein are only for describing specific embodiments and are not intended to limit the present utility model. The terms "including", "comprising", etc. used herein indicate the presence of the described features, steps, operations and / or components, but do not exclude the presence or addition of one or more other features, steps, operations or components.

[0042] All terms used herein, including technical and scientific terms, have the meanings commonly understood by those skilled in the art, unless otherwise defined. It should be noted that the terms used herein should be interpreted as having a meaning consistent with the context of this specification and should not be interpreted in an idealized or overly rigid manner.

[0043] In the case of using expressions such as "at least one of A, B, and C, etc.", generally, it should be interpreted according to the meaning that those skilled in the art usually understand this expression. For example, "a system having at least one of A, B, and C" should include, but not be limited to, a system having only A, only B, only C, having A and B, having A and C, having B and C, and / or having A, B, and C, etc. In the case of using expressions such as "at least one of A, B, or C, etc.", generally, it should be interpreted according to the meaning that those skilled in the art usually understand this expression. For example, "a system having at least one of A, B, or C" should include, but not be limited to, a system having only A, only B, only C, having A and B, having A and C, having B and C, and / or having A, B, and C, etc.

[0044] It should also be noted that the directional terms mentioned in the embodiments, such as "upper", "lower", "front", "rear", "left", "right", etc., are only for reference to the direction of the attached drawings and are not used to limit the protection scope of the present invention. Throughout the attached drawings, the same elements are represented by the same or similar reference numerals. When it may cause confusion in the understanding of the present invention, the conventional structures or configurations will be omitted.

[0045] Figure 1 is an exploded view of a connection sleeve group structure provided by the present invention, Figure 2 is Figure 1 an exploded view from another angle in the exemplary embodiment shown, Figure 3 is Figure 1 the overall structure diagram of the exemplary embodiment shown, Figure 4 is Figure 1 the overall architecture diagram from another angle of the exemplary embodiment shown.

[0046] An exemplary embodiment of the present invention provides a connection sleeve group, as Figures 1-4 shown, including a nut 1 and a washer 2. Among them, the nut 1 includes a main body portion 11 and an extension portion 12 extending from the first end in the axial direction of the main body portion 11. A first threaded hole adapted to be assembled with a bolt is provided through the main body portion 11 and the extension portion 12, and an external thread 14 is provided on the outside of the extension portion 12. A second threaded hole is formed in the middle of the washer 2 and is adapted to be assembled with the extension portion 12. The first internal thread 13 in the first threaded hole and the second internal thread 21 in the second threaded hole have the same spiral direction, and the pitch of the first internal thread 13 is greater than the pitch of the second internal thread 21.

[0047] In such an embodiment, by threadedly connecting the washer 2 to the nut 1, the washer 2 is pressed against the mounting body in response to the locking force provided by the nut 1, and the pitch of the first internal thread 13 of the nut 1 is configured to be greater than the pitch of the second internal thread 21 of the washer 2 to restrict the nut 1 from loosening relative to the assembled bolt. During assembly, first, the washer 2 is assembled onto the extension 12 of the nut 1 in the clockwise direction. At this time, the external thread 14 of the extension 12 cooperates with the second internal thread 21 of the washer 2. Then, the bolt passes through the mounting body and is assembled with the nut 1, so that the mounting body is fixed between the bolt head and the washer 2. At this time, the external thread of the bolt cooperates with the first internal thread 13 of the main body portion 11. Under the action of the assembly tool, the nut 1 continuously presses against the washer 2 to provide a locking force close to the mounting body until the clamping force and / or torque value required for assembly is reached. Since the rotation directions of the first internal thread 13 and the second internal thread 21 are the same, and the pitch of the first internal thread 13 is greater than the pitch of the second internal thread 21, if the nut 1 rotates in the counterclockwise direction, that is, the loosening direction, the nut 1 and the washer 2 will move away from each other or tend to move away from each other, causing the washer 2 to further abut against the mounting body, and the nut 1 drives the bolt to squeeze the mounting body, thereby effectively preventing the nut 1 from loosening relative to the bolt.

[0048] More specifically, after the nut 1 and the washer 2 are assembled, when the nut 1 is assembled onto the bolt, a two-stage tightening method is adopted, specifically: first, the nut is pre-tightened to 50% of the standard torque value, at this time the nut is loosened, and then the nut is pre-tightened again to the standard torque value.

[0049] By adopting such a tightening method, the thread pair can be pre-loaded to eliminate the uneven pre-tightening force caused by the uneven initial contact of the thread pair, so that the target pre-tightening force can be more accurately achieved during the second tightening.

[0050] Figure 5 is an exploded view of the second exemplary embodiment provided by the present utility model, Figure 6 is Figure 5 an exploded view of the exemplary embodiment shown in another angle, Figure 9 is an exploded view of the fourth exemplary embodiment provided by the present utility model, Figure 10 is Figure 9 an exploded view of the exemplary embodiment shown in another angle.

[0051] In an exemplary embodiment, the surface of the washer 2 facing the nut 1 and / or the surface of the nut 1 facing the washer 2 is configured as a rough surface, and the average roughness Ra > 2 μm.

[0052] In such an embodiment, as Figure 5 and Figure 9As shown, by configuring at least one of the surface of the washer 2 facing the nut 1 and the surface of the nut 1 facing the washer 2 to be a rough surface, the friction coefficient between the washer 2 and the nut 1 is increased, thereby increasing the frictional force when the washer 2 and the nut 1 rotate relative to each other, and improving the anti-loosening effect.

[0053] Exemplarily, the average roughness Ra of the rough surface should be greater than 2 μm. In this embodiment, the average roughness Ra value is selected between 20 - 50, which not only has a higher friction coefficient but also can reduce the processing cost to a certain extent.

[0054] Figure 7 is an exploded schematic view of the third exemplary embodiment provided by the present utility model. Figure 8 is Figure 7 an exploded schematic view of the exemplary embodiment shown from another angle.

[0055] In an exemplary embodiment, a plurality of protruding anti-slip portions 4 are arranged on both the surface of the washer facing the nut 1 and the surface of the nut 1 facing the washer 2, and the plurality of anti-slip portions 4 are spaced apart in the circumferential direction.

[0056] In such an embodiment, as Figure 1 and Figure 7 shown, by respectively providing anti-slip portions 4 on the surfaces where the nut 1 and the washer 2 are in contact with each other, and the anti-slip portions 4 are spaced apart in the circumferential direction, when the nut 1 and the washer 2 rotate relative to each other, it has a greater resistance compared to a common flat surface, thus improving the anti-loosening effect.

[0057] Exemplarily, the cross-section of the anti-slip portion 4 includes but is not limited to shapes such as an arc and a triangle. As Figure 1 and Figure 7 shown, the cross-section of the anti-slip portion 4 is configured to be circular-arc-shaped and is spaced apart in the circumferential direction to form a corrugated surface on the basis of the surface of the nut 1 / washer 2, which can not only improve the anti-loosening effect but also avoid difficult assembly.

[0058] It should be noted that when the cross-section of the anti-slip portion 4 is configured to be triangular, the angle of the corner opposite to the surface of the nut 1 / washer 2 should be as large as possible to prevent the distance between the washer 2 and the nut 1 from being too large or difficult to effectively assemble during assembly. In this exemplary embodiment, the angle of this corner is preferably 120° - 160°.

[0059] In an exemplary embodiment, the height of the extension portion 12 is less than the height of the washer 2.

[0060] In such an embodiment, by setting the height of the extension portion 12 to be less than the height of the washer 2, after the washer 2 is assembled to the extension portion 12 and then further assembled with the mounting body and the bolt, when the nut 1 tightens the bolt while pressing against the washer 2, the mounting body can be effectively clamped and a good anti-loosening effect can be achieved.

[0061] In an exemplary embodiment, the above-mentioned connecting sleeve set further includes a dust-proof member 3 disposed at the second end in the axial direction of the nut 1 to close the first threaded hole.

[0062] In such an embodiment, when designing or selecting the specification of the bolt, after the bolt is assembled with the nut 1 from the first end of the nut 1, the bolt does not penetrate through the entire nut 1. Such a design is mainly considered for safety in use to avoid potential safety hazards caused by the part of the bolt protruding from the nut 1. However, such a setting will cause dust to accumulate in the first threaded hole of the nut 1, affecting subsequent use or disassembly. Therefore, a dust-proof member 3 is provided at the second end in the axial direction of the nut 1 to close the first threaded hole and prevent dust from entering.

[0063] As Figures 7-10 shown, both the third embodiment and the fourth embodiment use the dust-proof member 3 to close the first threaded hole. Among them, the third embodiment is provided with an anti-slip portion 4 on the contact surface between the nut 1 and the washer 2, and the fourth embodiment is provided with a rough surface on the contact surface between the nut 1 and the washer 2.

[0064] According to an embodiment of the present disclosure, a clamping portion is provided on the inner side wall of the second end. The dust-proof member 3 includes a main body 31 and a clamping member 32. The main body 31 is fitted into the first threaded hole, and the clamping member 32 is arranged around the main body 31 and is in clamping cooperation with the clamping portion.

[0065] As Figure 1 、 Figure 2 、 Figure 5 and Figure 6 shown, the dust-proof members 3 of both the first embodiment and the second embodiment include a clamping member 32 for clamping cooperation with the clamping portion. Among them, the first embodiment is provided with an anti-slip portion 4 on the contact surface between the nut 1 and the washer 2, and the second embodiment is provided with a rough surface on the contact surface between the nut 1 and the washer 2.

[0066] In such an embodiment, the main body 31 is configured to be a substantially cylindrical structure. The bottom diameter of the cylinder matches the aperture of the first threaded hole, and the height of the cylinder is adjusted according to the remaining depth of the first threaded hole after the bolt is screwed in. One end of the main body 31 in contact with the outside is the upper end, and the end close to the bolt is the lower end. The clamping member 32 is arranged around the lower end of the main body 31 and is in clamping cooperation with the clamping portion, so that the dust-proof member 3 can be firmly clamped at the second end of the nut 1 to achieve a good dust-proof effect.

[0067] According to an embodiment of the present disclosure, the card member 32 is configured to extend axially from the end face of the main body 31 and project radially away from the main body 31 to engage with the engaging portion in a snap - fit manner.

[0068] In such an embodiment, the card member 32 extends axially downward from the end face at the lower end of the main body 31 and then projects radially to form a substantially card - foot structure to achieve snap - fit with the engaging portion.

[0069] Furthermore, the engaging portion is configured as an annular flange projecting radially from the inner side wall of the second end to be snap - fitted between the main body 31 and the card member 32.

[0070] In such an embodiment, the card member 32 extends downward from the lower end face of the main body 31. The distance from the starting point of the extension to the periphery of the main body 31 is d, the horizontal distance from the end after projection to the periphery of the main body 31 is a, and the length of the annular flange projecting from the inner side wall of the second end is b, and a > b is satisfied so that the annular flange can be snap - fitted between the main body 31 and the card member 32.

[0071] In some other embodiments, the engaging portion can also be configured as an annular groove formed on the inner side wall of the second end to enable the end of the card member 32 to be snap - fitted into the annular groove.

[0072] In such an embodiment, the card member 32 extends downward from the lower end face of the main body 31. The starting point of the extension is flush with the periphery of the main body 31, the horizontal distance from the end after projection to the periphery of the main body 31 is a, and the depth of the annular groove is b, and b > a is satisfied so that the end of the card member 32 can be snap - fitted into the annular groove.

[0073] An exemplary embodiment of the present utility model further provides a fastening mechanism, including the connecting sleeve set in any of the above - mentioned embodiments and a bolt. The bolt is provided with an external thread adapted to cooperate with the nut 1 of the connecting sleeve set.

[0074] The above describes the embodiments of the present utility model. However, these embodiments are only for illustrative purposes and not for limiting the scope of the present utility model. Although the embodiments are described separately above, this does not mean that the measures in each embodiment cannot be used advantageously in combination. The scope of the present utility model is defined by the appended claims and their equivalents. Without departing from the scope of the present utility model, those skilled in the art can make various substitutions and modifications, and these substitutions and modifications should all fall within the scope of the present utility model.

Claims

1. A connecting sleeve set, characterized in that, Comprising: A nut (1), including a main body portion (11) and an extension portion (12) extending from the first axial end of the main body portion (11). A first threaded hole adapted to be assembled with a bolt is provided through the main body portion (11) and the extension portion (12), and an external thread (14) is provided on the outside of the extension portion (12); A washer (2), a second threaded hole is formed in the middle of the washer (2), and it is adapted to be assembled with the extension portion (12); Wherein, the first internal thread (13) in the first threaded hole and the second internal thread (21) in the second threaded hole have the same spiral direction, and the pitch of the first internal thread (13) is greater than the pitch of the second internal thread (21).

2. The connecting sleeve set according to claim 1, characterized in that, The surface of the washer (2) facing the nut (1), and / or, the surface of the nut (1) facing the washer (2) is configured as a rough surface, and the average roughness Ra > 2μm.

3. The connecting sleeve set according to claim 1, wherein, The surface of the washer (2) facing the nut (1) and the surface of the nut (1) facing the washer (2) are both provided with a plurality of protruding anti-slip portions (4), and the plurality of anti-slip portions (4) are arranged at intervals in the circumferential direction.

4. The connecting sleeve set according to claim 1, characterized in that, The height of the extension portion (12) is less than the height of the washer (2).

5. The connecting sleeve set according to any one of claims 1-4, characterized in that, It further includes a dust-proof member (3), which is arranged at the second axial end of the nut (1) to close the first threaded hole.

6. The connecting sleeve set according to claim 5, wherein A clamping portion is provided on the inner side wall of the second end; The dust-proof member (3) includes: A body (31), which is fitted into the first threaded hole; A clamping member (32), which is arranged around the body (31) and is in clamping cooperation with the clamping portion.

7. The connecting sleeve set according to claim 6, wherein The clamping member (32) is configured to extend axially from the end face of the body (31) and protrude radially away from the body (31) to be in clamping cooperation with the clamping portion.

8. The connecting sleeve set according to claim 7, wherein The clamping portion is configured as an annular flange extending radially from the inner side wall of the second end to be clamped between the body (31) and the end of the clamping member (32).

9. The connecting sleeve set according to claim 7, characterized in that, The clamping portion is configured as an annular groove formed on the inner side wall of the second end, so that the end of the clamping member (32) is clamped in the annular groove.

10. A fastening mechanism, characterized in that, Comprising: A connecting sleeve set according to any one of claims 1-9; and A bolt, the bolt is configured with an external thread adapted to cooperate with the nut (1) of the connecting sleeve set.

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