Tightening tool
By designing a polygonal sleeve and bolt mating component, the problem of easy damage to the coating during bolt tightening was solved, thereby improving the corrosion resistance and extending the service life of the bolt.
Patent Information
- Application Number
- CN202511285066.4
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-09-09
- Publication Date
- 2025-11-21
AI Technical Summary
When bolts are tightened, the coating on the bolts from the sleeve is easily damaged, resulting in a decrease in the bolts' corrosion resistance and failure to meet design requirements.
Design a tightening tool in which the first and second mating parts of the sleeve and the first connecting part of the bolt are both polygonal structures. By rotating the sleeve, forces are applied to both sides of the bolt simultaneously, reducing unilateral stress and improving corrosion resistance.
It effectively reduces damage to the bolt coating, improves the bolt's corrosion resistance, and extends its service life.
Smart Images
Figure CN120990973A_ABST
Abstract
Description
Technical Field
[0001] This application relates to the field of assembly tool technology, and more particularly to a tightening tool. Background Technology
[0002] Fasteners are known as the "rice of industry" and are among the most frequently used parts in industry. Corrosion of fasteners can lead to the failure of parts, equipment, or facilities. Therefore, fasteners need to be coated with a plating layer for corrosion protection. However, since the hardness of the coating layer on the bolt surface is much lower than the hardness of the bolt and sleeve materials, when the bolt is tightened, the force exerted by the sleeve on the bolt is concentrated at the outer hexagonal edge of the bolt. As the tightening speed and torque increase, the coating layer that should be prevented from being tightened is damaged, resulting in a decrease in the bolt's corrosion resistance. Summary of the Invention
[0003] This application provides a tightening tool that can reduce bolt damage and improve the bolt's corrosion resistance.
[0004] To achieve the above objectives, the main technical solutions adopted in this application include:
[0005] This application provides a tightening tool, including a bolt and a sleeve. The bolt includes a nut and a bolt shank. The nut has a first connecting portion, which is annular and surrounds a first groove. Along the axial direction of the sleeve, one end of the sleeve has a first mating portion and a second mating portion. Along the radial direction of the sleeve, the first mating portion is located outside the second mating portion, and the first mating portion and the second mating portion are spaced apart to form a second groove. The first connecting portion mates with the second groove, and both the outer peripheral surface of the first connecting portion and the outer peripheral surface of the second groove are polygonal. The second mating portion mates with the first groove, and both the peripheral surface of the second mating portion and the peripheral surface of the first groove are polygonal.
[0006] The tightening tool proposed in this application has a polygonal structure for both the outer peripheral surface of the first connecting part and the outer peripheral surface of the second groove, as well as for both the peripheral surface of the second mating part and the peripheral surface of the first groove. When the sleeve is fitted onto the bolt, the first connecting part of the bolt is accommodated in the second groove, and the second mating part is accommodated in the first groove. The outer peripheral surface of the first connecting part mates with the outer peripheral surface of the second groove, and the peripheral surface of the second mating part mates with the peripheral surface of the first groove. Therefore, when the sleeve is rotated, the sleeve applies a force to the outer periphery of the first connecting part through the first mating part, and simultaneously applies a force to the inner periphery of the first connecting part through the second mating part. In other words, the sleeve applies a force to both sides of the first connecting part at the same tightening force. Under the same tightening force, the force on both sides of the first connecting part is reduced, thereby reducing damage to the coating on the surface of the first connecting part and improving the corrosion resistance of the bolt.
[0007] Optionally, the outer peripheral surface of the first connecting part and the outer peripheral surface of the second groove are both constructed as hexagonal structures, and the peripheral surface of the second mating part and the peripheral surface of the first groove are both constructed as hexagonal structures.
[0008] In the above embodiment, since the first and second mating parts of the sleeve simultaneously mate with the outer and inner circumferential surfaces of the first connecting part, the force exerted by the sleeve on the nut increases from 6 points to 12 points, thereby reducing the magnitude of the force borne by a single point on the nut and thus reducing damage to the nut.
[0009] Optionally, the outer peripheral surface of the first connecting part includes a plurality of first surfaces, and the first groove includes a plurality of second surfaces. Along the radial direction of the nut, the connecting lines between the plurality of first surfaces correspond one-to-one with the connecting lines between the plurality of second surfaces.
[0010] In the above embodiment, when the sleeve rotates relative to the nut, along the radial direction of the nut, the point of application of the force exerted by the first mating part on the connecting line of two adjacent first surfaces and the point of application of the force exerted by the second mating part on the connecting line of two adjacent second surfaces are on the same line. Therefore, the tightening torque borne by the nut is the sum of the tightening torque borne by the inner circumferential surface of the first connecting part and the tightening torque borne by the outer circumferential surface of the first connecting part, thereby reducing the tightening torque borne by the first connecting part on one side, and thus reducing the damage to the nut when the sleeve tightens the nut.
[0011] Optionally, the first connecting portion is gap-fitted into the second groove, and the second mating portion is gap-fitted into the first groove.
[0012] In the above embodiments, the gap fit between the first connecting part and the second groove makes it easier for the first connecting part to be inserted into the second groove; the gap fit between the second mating part and the first groove makes it easier for the second mating part to be inserted into the first groove.
[0013] Optionally, the outer peripheral surface of the second groove includes a plurality of third surfaces, and the peripheral surface of the second mating part has a plurality of fourth surfaces. Along the radial direction of the sleeve, the gap between the first surface and the corresponding third surface is greater than the gap between the second surface and the fourth surface.
[0014] In the above embodiment, by setting the gap between the first surface and the corresponding third surface to be greater than the gap between the second surface and the fourth surface, when the sleeve rotates, it can be ensured that the force applied by the first mating part to the outer circumferential surface of the first connecting part and the force applied by the second mating part to the inner circumferential surface of the first connecting part act simultaneously, thereby reducing the force on one side of the first connecting part, thereby reducing the damage to the coating on the nut and improving the corrosion resistance of the bolt.
[0015] Optionally, along the radial direction of the sleeve, the gap between the first surface and the corresponding third surface is α1, and the gap between the second surface and the fourth surface is α2, satisfying: α2=2 / 3α1.
[0016] In the above embodiment, by setting the gap between the second and fourth surfaces to 2 / 3 of the gap between the first surface and the corresponding third surface, when the sleeve rotates, it can be ensured that the force applied by the first mating part to the outer circumferential surface of the first connecting part and the force applied by the second mating part to the inner circumferential surface of the first connecting part act simultaneously, so as to reduce the force on one side of the first connecting part, thereby reducing the damage to the coating on the nut and improving the corrosion resistance of the bolt.
[0017] Optionally, the nominal size of the first connecting part is H1, and the gap α1 between the first surface and the corresponding third surface along the radial direction of the sleeve satisfies: α1 = 0.01H1.
[0018] In the above embodiment, the first connecting part is more easily inserted into the second groove. When the sleeve rotates to tighten the nut, the force point of the nut is close to the connecting line of the two first surfaces, which reduces damage to the nut and improves the service life of the bolt.
[0019] Optionally, when the first connecting part is engaged with the second groove, the rotation angle of the sleeve relative to the bolt is 1° to 3°.
[0020] In the above embodiment, the stress point of the nut is close to the connection line between the two first surfaces, which reduces damage to the nut, increases the service life of the bolt, and ensures that the first connecting part can be easily inserted into the second groove. Attached Figure Description
[0021] To more clearly illustrate the technical solutions in the specific embodiments of this application or the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this application. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.
[0022] Figure 1 This is a schematic diagram of the bolt structure in an embodiment of this application;
[0023] Figure 2 This is a top view of the bolt in an embodiment of this application;
[0024] Figure 3 This is a schematic diagram of the sleeve structure in an embodiment of this application;
[0025] Figure 4 This is a top view of the sleeve in an embodiment of this application;
[0026] Figure 5 This is a schematic diagram of the bolt and sleeve assembly in an embodiment of this application;
[0027] Figure 6 This is a schematic diagram of the bolt and sleeve assembly in an embodiment of this application.
[0028] [Explanation of Labels in the Attached Image]
[0029] 1. Bolt; 11. Nut; 12. Bolt shank; 13. First connecting part; 14. First groove; 15. First surface; 16. Second surface;
[0030] 2. Sleeve; 21. First mating part; 22. Second mating part; 23. Second groove; 24. Third surface; 25. Fourth surface. Detailed Implementation
[0031] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.
[0032] Unless otherwise defined, all technical and scientific terms used in this application have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains; the terminology used in the description of this application is for the purpose of describing particular embodiments only and is not intended to limit the application; the terms "comprising" and "having," and any variations thereof, in the description, claims, and accompanying drawings of this application are intended to cover non-exclusive inclusion. The terms "first," "second," etc., in the description, claims, or accompanying drawings of this application are used to distinguish different objects, not to describe a specific order or hierarchy.
[0033] In this application, the reference to "embodiment" means that a specific feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a mutually exclusive, independent, or alternative embodiment. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described in this application can be combined with other embodiments.
[0034] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," "linking," and "attachment" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal communication between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.
[0035] In this application, the term "and / or" is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, or B existing alone. Additionally, in this application, the character " / " generally indicates that the preceding and following related objects have an "or" relationship.
[0036] In this application, "multiple" refers to two or more (including two), and similarly, "multiple groups" refers to two or more (including two), and "multiple pieces" refers to two or more (including two).
[0037] For M10 and larger bolts, the tightening method is generally an external hexagon. Because the hardness of the bolt surface coating is much lower than the hardness of the bolt and sleeve materials, and because there is a large clearance between the sleeve and bolt for easy tightening, the surface coating at the tightening point of the bolt head is easily damaged during tightening. When tightening a bolt with a sleeve, the force is concentrated entirely on the edge of the external hexagon in the tightening direction. The higher the tightening speed and torque, the more severe the damage to the surface coating at the tightening point, leading to a significant reduction in the bolt's corrosion resistance and failure to meet design requirements. Therefore, it is necessary to improve the corrosion resistance of fasteners after assembly, while ensuring the fastener products meet corrosion resistance standards, to reduce fastener failures caused by corrosion. This can save significant manpower, material resources, and financial resources, and extend the service life of parts, equipment, and facilities.
[0038] This application improves the stress conditions at the bolt tightening point, thereby reducing the damage to the surface coating at the bolt tightening point and improving the bolt's corrosion resistance.
[0039] This application provides a tightening tool, see reference. Figures 1 to 4The tightening tool includes a connecting bolt 1 and a sleeve 2. The bolt 1 includes a nut 11 and a bolt shank 12. The nut 11 has a first connecting portion 13, which is an annular structure and surrounds a first groove 14. Along the axial direction of the sleeve 2, one end of the sleeve 2 has a first mating portion 21 and a second mating portion 22. Along the radial direction of the sleeve 2, the first mating portion 21 is located outside the second mating portion 22. The first mating portion 21 and the second mating portion 22 are spaced apart to form a second groove 23. The first connecting portion 13 fits into the second groove 23, and the outer peripheral surface of the first connecting portion 13 and the outer peripheral surface of the second groove 23 are both constructed as polygonal structures. The second mating portion 22 fits into the first groove 14, and the peripheral surface of the second mating portion 22 and the peripheral surface of the first groove 14 are both constructed as polygonal structures.
[0040] The first connecting portion 13 has an annular structure, and the first groove 14 enclosed by the first connecting portion 13 is also the inner circumferential surface of the first connecting portion 13. Along the axial direction of the sleeve 2, a second groove 23 is provided at one axial end of the sleeve 2. Along the radial direction of the sleeve 2, the second groove 23 separates the first mating portion 21 and the second mating portion 22. The inner circumferential surface of the second groove 23 is also the circumferential surface of the second mating portion 22, and the outer circumferential surface of the second groove 23 is also the inner circumferential surface of the first mating portion 21. Since the outer peripheral surfaces of the first connecting part 13 and the second groove 23 are both polygonal, and the peripheral surfaces of the second mating part 22 and the first groove 14 are both polygonal, when the sleeve 2 is fitted onto the bolt 1, the first connecting part 13 of the bolt 1 is accommodated in the second groove 23, and the second mating part 22 is accommodated in the first groove 14. The outer peripheral surface of the first connecting part 13 mates with the outer peripheral surface of the second groove 23, and the peripheral surface of the second mating part 22 mates with the peripheral surface of the first groove 14. Therefore, when the sleeve 2 is rotated, the sleeve 2 applies force to the outer periphery of the first connecting part 13 through the first mating part 21, and simultaneously applies force to the inner periphery of the first connecting part 13 through the second mating part 22. In other words, the sleeve 2 applies force to both sides of the first connecting part 13 at the same time. Under the same tightening force, the force on both sides of the first connecting part 13 is reduced, thereby reducing the damage to the coating on the surface of the first connecting part 13 and improving the corrosion resistance of the bolt 1.
[0041] For example, the outer peripheral surface of the first connecting part 13 and the outer peripheral surface of the second groove 23 can both be constructed as pentagons, hexagons, heptagons or octagons, etc. The shape of the outer peripheral surface of the first connecting part 13 and the outer peripheral surface of the second groove 23 can be determined according to the specific application, and this application is not limited thereto; the peripheral surface of the second mating part 22 and the peripheral surface of the first groove 14 can both be constructed as pentagons, hexagons, heptagons or octagons, etc. The shape of the peripheral surface of the second mating part 22 and the peripheral surface of the first groove 14 can be determined according to the specific application, and this application is not limited thereto.
[0042] Optionally, the outer peripheral surface of the first connecting part 13 and the outer peripheral surface of the second groove 23 are both constructed as hexagonal structures, and the peripheral surface of the second mating part 22 and the peripheral surface of the first groove 14 are both constructed as hexagonal structures.
[0043] The outer peripheral surface of the first connecting surface of the hexagonal structure and the outer peripheral surface of the second groove 23 are in a surface-to-surface fit. The peripheral surface of the second mating part 22 of the hexagonal structure and the inner peripheral surface of the first groove 14 are also in a surface-to-surface fit. The sleeve 2 can completely cover the six faces and six apex corners of the nut 11. When the sleeve 2 applies torque to the nut 11, the force will be evenly distributed on the entire contact surface, reducing stress concentration at the apex corners of the nut 11 and the sleeve 2, thereby reducing damage to the nut 11 and the sleeve 2.
[0044] Since the first mating part 21 and the second mating part 22 of the sleeve 2 simultaneously mate with the outer and inner circumferential surfaces of the first connecting part 13, the force exerted by the sleeve 2 on the nut 11 increases from 6 points to 12 points, thereby reducing the magnitude of the force borne by the nut 11 at a single point and thus reducing damage to the nut 11.
[0045] Optionally, refer to Figure 1 and Figure 2 The outer peripheral surface of the first connecting part 13 includes a plurality of first surfaces 15, and the first groove 14 includes a plurality of second surfaces 16. Along the radial direction of the nut 11, the connecting lines between the plurality of first surfaces 15 correspond one-to-one with the connecting lines between the plurality of second surfaces 16.
[0046] Multiple first surfaces 15 are connected end-to-end, with adjacent first surfaces 15 arranged at an angle, and their intersection forming a apex angle. Multiple second surfaces 16 are also connected end-to-end, with adjacent second surfaces 16 arranged at an angle, and their intersection forming a apex angle. The multiple first surfaces 15 and multiple second surfaces 16 are arranged in a one-to-one correspondence. Furthermore, along the radial direction of the nut 11, the connecting line between two adjacent first surfaces 15 is opposite to the connecting line between the corresponding two second surfaces 16. In other words, along the radial direction of the nut 11, the apex angle formed between two adjacent first surfaces 15 is opposite to the apex angle formed between the corresponding two second surfaces 16. When the sleeve 2 rotates relative to the nut 11, along the radial direction of the nut 11, the point of application of the force exerted by the first mating part 21 on a certain apex angle of the outer circumference of the first connecting part 13 and the point of application of the force exerted by the second mating part 22 on a corresponding apex angle of the inner circumference of the first connecting part 13 are on the same line. In other words, along the radial direction of the nut 11, the point of application of the force exerted by the first mating part 21 on the connecting line of two adjacent first surfaces 15 and the point of application of the force exerted by the second mating part 22 on the connecting line of two adjacent second surfaces 16 are on the same line. Therefore, the tightening torque borne by the nut 11 is the sum of the tightening torque borne by the inner circumferential surface of the first connecting part 13 and the tightening torque borne by the outer circumferential surface of the first connecting part 13, thereby reducing the tightening torque borne by the first connecting part 13 on one side, and thus reducing the damage to the nut 11 when the sleeve 2 tightens the nut 11.
[0047] Optionally, refer to Figure 5 The first connecting part 13 is fitted with the second groove 23 with a clearance, and the second mating part 22 is fitted with the first groove 14 with a clearance. The clearance fit between the first connecting part 13 and the second groove 23 allows the first connecting part 13 to be inserted into the second groove 23 more easily; the clearance fit between the second mating part 22 and the first groove 14 allows the second mating part 22 to be inserted into the first groove 14 more easily.
[0048] Optionally, refer to Figure 3 , Figure 5 and Figure 6 The outer peripheral surface of the second groove 23 includes a plurality of third surfaces 24, and the peripheral surface of the second mating part 22 has a plurality of fourth surfaces 25. Along the radial direction of the sleeve 2, the gap between the first surface 15 and the corresponding third surface 24 is greater than the gap between the second surface 16 and the fourth surface 25.
[0049] The outer circumferential surface of the second groove 23 is also the inner circumferential surface of the first mating part 21. Since the first mating part 21 is located on the outside and the second mating part 22 is located on the inside, the rotation radius of the first mating part 21 is large, and the space required for the first mating part 21 to rotate is relatively large. The rotation radius of the second mating part 22 is small, and the space required for the second mating part 22 to rotate is relatively small. By setting the gap between the first surface 15 and the corresponding third surface 24 to be greater than the gap between the second surface 16 and the fourth surface 25, when the sleeve 2 rotates, it can be ensured that the force applied by the first mating part 21 to the outer circumferential surface of the first connecting part 13 and the force applied by the second mating part 22 to the inner circumferential surface of the first connecting part 13 act simultaneously, thereby reducing the force on one side of the first connecting part 13, thereby reducing the damage to the coating on the nut 11 and improving the corrosion resistance of the bolt 1.
[0050] Optionally, refer to Figure 5 Along the radial direction of sleeve 2, the gap between the first surface 15 and the corresponding third surface 24 is α1, and the gap between the second surface 16 and the fourth surface 25 is α2, satisfying: α2=2 / 3α1.
[0051] By setting the gap between the second surface 16 and the fourth surface 25 to 2 / 3 of the gap between the first surface 15 and the corresponding third surface 24, when the sleeve 2 rotates, it can be ensured that the force applied by the first mating part 21 to the outer peripheral surface of the first connecting part 13 and the force applied by the second mating part 22 to the inner peripheral surface of the first connecting part 13 act simultaneously. The point of force application of the first mating part 21 to the first connecting part 13 is at the connection point of two adjacent first surfaces 15, and the point of force application of the second mating part 22 to the first connecting part 13 is at the connection point of two adjacent second surfaces 16. The force of the first mating part 21 to the connection point of two adjacent first surfaces 15 and the force of the second mating part 22 to the connection point of two adjacent second surfaces 16 act simultaneously. Furthermore, along the radial direction of the nut 11, the connection points of two adjacent second surfaces 16 are arranged opposite to the corresponding connection points of two adjacent second surfaces 16. In other words, the first mating part 21 and the second mating part 22 simultaneously apply force to the first connecting part 13, causing both the inner and outer sides of the first connecting part 13 to be stressed at the same time, with the stress point close to the connection line between two adjacent first surfaces 15 of the first connecting part 13 and the connection line between two adjacent second surfaces 16 of the first groove 14. This arrangement reduces the stress on one side of the first connecting part 13, thereby reducing damage to the coating on the nut 11 and improving the corrosion resistance of the bolt 1.
[0052] Optionally, the nominal dimension of the first connecting part 13 is H1, and along the radial direction of the sleeve 2, the gap α1 between the first surface 15 and the corresponding third surface 24 satisfies: α1 = 0.01H1. By limiting α...
[0053] = 0.01H1, which makes it easier for the first connecting part 13 to be inserted into the second groove 23. When the sleeve 2 rotates to tighten the nut 11, the force point of the nut 11 is close to the connection line of the two first surfaces 15, which reduces damage to the nut 11 and increases the service life of the bolt 1.
[0054] If α1 is too small, the first connecting part 13 will not be easy to insert into the second groove 23. If α1 is too large, when the sleeve 2 rotates to tighten the nut 11, the rotation angle of the sleeve 2 relative to the bolt 1 will increase, causing the stress point of the nut 11 to be far away from the connection line between the two adjacent first surfaces 15 of the first connecting part 13 and the connection line between the two adjacent second surfaces 16 of the first groove 14, which will easily damage the nut 11 and reduce the service life of the bolt 1.
[0055] It should be noted that when the cross-section of the first connecting part 13 is a polygon with an even number of sides, such as a hexagon or an octagon, the nominal size of the first connecting part 13 is the distance between two opposite faces; when the cross-section of the first connecting part 13 is a polygon with an odd number of sides, such as a pentagon or a heptagon, the nominal size of the first connecting part 13 is the distance between a vertex and its opposite face.
[0056] Optionally, refer to Figure 6 When the first connecting part 13 is engaged with the second groove 23, the rotation angle of the sleeve 2 relative to the bolt 1 is 1° to 3°. By limiting the rotation angle b of the sleeve 2 relative to the bolt 1 to 1° to 3°, the stress point of the nut 11 is brought closer to the connection line of the two first surfaces 15, reducing damage to the nut 11, increasing the service life of the bolt 1, and ensuring that the first connecting part 13 can be easily inserted into the second groove 23.
[0057] Because the first mating part 21 is clearance-fitted into the second groove 23, the first connecting part 13 can rotate relative to the second groove 23. However, the rotation angle of the sleeve 2 relative to the bolt 1 cannot be too large. If the rotation angle of the sleeve 2 relative to the bolt 1 is too large, the stress point of the nut 11 will be far away from the connection line between the two adjacent first surfaces 15 of the first connecting part 13 and the connection line between the two adjacent second surfaces 16 of the first groove 14, which will easily damage the nut 11 and reduce the service life of the bolt 1. If the rotation angle of the sleeve 2 relative to the bolt 1 is too small, it will be difficult for the first connecting part 13 to be inserted into the second groove 23.
[0058] For example, the rotation angle b of the sleeve 2 relative to the bolt 1 can be 1°, 2° or 3°, etc. It should be noted that since there are tolerances in the manufacturing of the nut 11 and the sleeve 2, the rotation angle of the sleeve 2 relative to the bolt 1 is determined by the manufacturing process. The specific value of the rotation angle b of the sleeve 2 relative to the bolt 1 can be determined according to the specific situation, as long as it can be ensured that when the sleeve 2 applies force to the first connecting part 13, the force-bearing point of the first connecting part 13 is close to the connection line of the two adjacent first surfaces 15 of the first connecting part 13 and the connection line of the two adjacent second surfaces 16 of the first groove 14.
[0059] For example, refer to Figure 5 A first line is formed at the connection between two adjacent first surfaces 15, with a force F1 and a tightening torque M1. A second line is formed at the connection between two adjacent second surfaces 16, with a force F2 and a tightening torque M2. The nut 11 experiences a torque M. The first and second lines are positioned opposite each other along the radial direction of the nut 11. The radius of the first line is R2, and the radius of the second line is R1. The resultant force on the first connecting part 13 is F, and the radius of the first connecting part 13 is R, where R = R2.
[0060] M = M1 + M2;
[0061] M = F × R
[0062] M1 = F1 × R1
[0063] M² = F² × R²
[0064] Therefore, we can conclude that
[0065] definition
[0066] Therefore, F = K × F1 + F2.
[0067] From the above derivation, we can conclude that F > F1 and F > F2. Therefore, under the same tightening torque, the force on both sides of the first connecting part 13 is reduced, thereby reducing the damage to the coating on the nut 11 and improving the corrosion resistance of the bolt 1.
[0068] It should also be noted that the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.
[0069] The various embodiments in this specification are described in a progressive manner. Similar or identical parts between embodiments can be referred to mutually. Each embodiment focuses on describing the differences from other embodiments. In particular, the system embodiments are basically similar to the method embodiments, so the description is relatively simple; relevant parts can be referred to the descriptions in the method embodiments.
[0070] The above description is merely an embodiment of this application and is not intended to limit this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principle of this application should be included within the scope of the claims of this application.
[0071] Although embodiments of this application have been described in conjunction with the accompanying drawings, those skilled in the art can make various modifications and variations without departing from the spirit and scope of this application, and such modifications and variations all fall within the scope defined by the appended claims.
Claims
1. A tightening tool, characterized in that, include: The bolt (1) includes a connecting nut (11) and a bolt shank (12), the nut (11) having a first connecting portion (13) which is constructed as an annular structure and surrounds a first groove (14); Sleeve (2), along the axial direction of the sleeve (2), one end of the sleeve (2) has a first mating part (21) and a second mating part (22), along the radial direction of the sleeve (2), the first mating part (21) is provided outside the second mating part (22), the first mating part (21) and the second mating part (22) are spaced apart to form a second groove (23); The first connecting part (13) is fitted to the second groove (23), and the outer peripheral surface of the first connecting part (13) and the outer peripheral surface of the second groove (23) are both constructed as polygonal structures. The second fitting part (22) is fitted to the first groove (14), and the peripheral surface of the second fitting part (22) and the peripheral surface of the first groove (14) are both constructed as polygonal structures.
2. The tightening tool according to claim 1, characterized in that, The outer peripheral surface of the first connecting part (13) and the outer peripheral surface of the second groove (23) are both constructed as hexagonal structures, and the peripheral surface of the second mating part (22) and the peripheral surface of the first groove (14) are both constructed as hexagonal structures.
3. The tightening tool according to claim 1, characterized in that, The outer peripheral surface of the first connecting part (13) includes a plurality of first surfaces (15), and the first groove (14) includes a plurality of second surfaces (16). Along the radial direction of the nut (11), the connecting lines between the plurality of first surfaces (15) correspond one-to-one with the connecting lines between the plurality of second surfaces (16).
4. The tightening tool according to claim 3, characterized in that, The first connecting part (13) is fitted with the second groove (23) with a gap, and the second fitting part (22) is fitted with the first groove (14) with a gap.
5. The tightening tool according to claim 4, characterized in that, The outer peripheral surface of the second groove (23) includes a plurality of third surfaces (24), and the peripheral surface of the second mating part (22) has a plurality of fourth surfaces (25). Along the radial direction of the sleeve (2), the gap between the first surface (15) and the corresponding third surface (24) is greater than the gap between the second surface (16) and the fourth surface (25).
6. The tightening tool according to claim 5, characterized in that, Along the radial direction of the sleeve (2), the gap between the first surface (15) and the corresponding third surface (24) is α1, and the gap between the second surface (16) and the fourth surface (25) is α2, satisfying: α2=2 / 3α1.
7. The tightening tool according to claim 6, characterized in that, The nominal size of the first connecting part (13) is H1. Along the radial direction of the sleeve (2), the gap α1 between the first surface (15) and the corresponding third surface (24) satisfies: α1=0.01H1.
8. The tightening tool according to claim 4, characterized in that, When the first connecting part (13) is engaged with the second groove (23), the rotation angle of the sleeve (2) relative to the bolt (1) is 1° to 3°.