Torque bolt

Abstract

This application discloses a torque bolt, relating to the field of connecting fittings technology, comprising a threaded sleeve, a screw, and an elastic element. The first end face of the threaded sleeve has at least two ratchet grooves, and the circumferential outer wall of the second end of the threaded sleeve has external threads. The first end of the screw has ratchet teeth that mesh with the ratchet grooves. The elastic element applies force to the screw to engage the ratchet teeth with the ratchet grooves, thereby allowing the threaded sleeve and screw to rotate synchronously. In use, the rotation of the screw drives the threaded sleeve to rotate together and be screwed into the threaded hole of the threaded sleeve or nut. During tightening, when the torque provided by the external thread friction exceeds the torque limit of the torque bolt, the elastic element deforms, the ratchet teeth extend from the ratchet grooves, and the screw slips relative to the threaded sleeve, while the threaded sleeve stops rotating, thus achieving torque limitation. This solves the problem of substrate cracking or threaded sleeve dislodgement caused by excessive pre-tightening force when pre-embedded threaded sleeves are embedded in plastic or fiberglass substrates.

Description

Technical Field

[0001] This application relates to the field of connecting fittings technology, and more specifically, to a torque bolt. Background Technology

[0002] In rail passenger vehicles, the base made of plastic or fiberglass usually uses pre-embedded threaded sleeves as installation nodes. Due to the lack of torque control when tightening the bolts that mate with the threaded sleeves using electric or air drills, excessive preload often causes the pre-embedded threaded sleeves to come off or the base to crack, resulting in direct damage to the base. Although some excessive preload may not cause immediate damage, it can easily lead to delayed failure under long-term thermal expansion and contraction and external forces, affecting operational safety.

[0003] Therefore, how to solve the problem of base cracking or bolt sleeve detachment caused by excessive preload in such bolted connections has become a technical problem that urgently needs to be solved by those skilled in the art. Summary of the Invention

[0004] In view of this, the purpose of this application is to provide a torque bolt to solve the problem of base cracking or bolt sleeve dislodgement caused by excessive preload in bolted connections.

[0005] A torque bolt, comprising:

[0006] The threaded sleeve has at least two ratchet grooves on the end face of the first end, and each ratchet groove is arranged sequentially around the central axis of the threaded sleeve. The threaded sleeve has a mounting hole, and the circumferential outer wall of the second end of the threaded sleeve has an external thread.

[0007] The screw part has a first end provided with ratchet teeth that mesh with the ratchet groove, and a second end provided in the mounting hole;

[0008] An elastic element is disposed in the mounting hole and sleeved on the second end of the screw portion, and the elastic element is used to apply force to the screw portion so that the ratchet tooth engages with the ratchet groove.

[0009] In some embodiments, along the tightening direction of the torque bolt, the groove depth of each ratchet groove decreases sequentially, and the groove depth is the maximum dimension of the ratchet groove along the axial direction of the threaded sleeve.

[0010] In some embodiments, the mounting hole is formed on the end face of the second end of the threaded sleeve portion, and a limiting member is provided at the second end of the screw portion, the limiting member being disposed within the mounting hole;

[0011] The first end of the elastic element abuts against the bottom wall of the mounting hole, and the second end of the elastic element abuts against the limiting element.

[0012] In some embodiments, the second end of the screw portion is provided with an insert groove for the limiting member to be inserted;

[0013] Alternatively, the limiting member is threadedly engaged with the second end of the screw portion.

[0014] In some embodiments, the elastic element is a linear spring or a disc spring assembly.

[0015] In some embodiments, the flanks and / or root of the external thread are provided with a reservoir structure for accommodating thread-locking adhesive.

[0016] In some embodiments, the adhesive storage structure includes a spiral microgroove extending along the helical direction of the external thread and disposed on the tooth side and / or tooth root of the external thread, wherein the cross-sectional shape of the spiral microgroove is semi-circular, triangular or rectangular;

[0017] And / or, the glue storage structure includes a plurality of annular recesses disposed at the root of the external thread, the annular recesses being evenly arranged around the circumference of the threaded sleeve and spaced apart along the axial direction of the threaded sleeve;

[0018] And / or, the adhesive storage structure includes a knurled texture provided on the flank surface of the external thread.

[0019] In some embodiments, the outer surfaces of the threaded sleeve, the threaded rod, and the elastic element are covered with an anti-corrosion coating.

[0020] In some embodiments, a relief groove is provided on the circumferential outer wall of the first end of the threaded sleeve.

[0021] In some embodiments, the end face of the first end of the screw portion is provided with a tightening groove for a disassembly / reassembly tool to be inserted.

[0022] The torque bolt provided in this application includes a threaded sleeve, a screw, and an elastic element. The end face of the first end of the threaded sleeve is provided with at least two ratchet grooves, and each ratchet groove is arranged sequentially around the central axis of the threaded sleeve. The threaded sleeve has a mounting hole. The circumferential outer wall of the second end of the threaded sleeve is provided with an external thread for threaded engagement with the base threaded sleeve or nut. The first end of the screw is provided with ratchet teeth that mesh with the ratchet grooves, and the second end of the screw is disposed in the mounting hole. The elastic element is disposed in the mounting hole and sleeved on the second end of the screw, and the elastic element is used to apply force to the screw to make the ratchet teeth mesh with the ratchet grooves, thereby allowing the threaded sleeve and the screw to rotate synchronously. In the initial state, the ratchet of the screw is engaged in the ratchet groove under the pull of the elastic element. During use, the rotation of the screw drives the threaded sleeve to rotate together and screw into the threaded hole of the threaded sleeve or nut. During the tightening process, when the torque provided by the external thread friction force exceeds the torque limit of the torque bolt, the elastic element deforms, the ratchet extends out of the ratchet groove, and the screw rotates and slips relative to the threaded sleeve, while the threaded sleeve stops rotating, thus achieving torque limitation. In addition, the cooperation between the ratchet groove and the ratchet can also achieve reverse locking to prevent loosening due to vibration or other reasons. When disassembling, simply twist the screw in the opposite direction to unscrew the threaded sleeve together.

[0023] Compared to related technologies, the torque bolt provided in this application has controllable torque, which can effectively and automatically control the preload without relying on a torque wrench and matching spring washers and flat washers. This not only prevents excessive force on the installation point, but also reduces the types of tools required and lowers the skill requirements for operators. It solves the problem of cracking of the substrate or dislodging of the threaded sleeve in plastic or fiberglass substrates due to excessive preload. It is suitable for fastening scenarios where torque accuracy requirements are not high but failure and cracking are prone to occur. In addition, the torque bolt has the characteristics of being detachable and reusable and having reverse self-locking, which can effectively protect the installation point while improving assembly efficiency and connection reliability. Attached Figure Description

[0024] To more clearly illustrate the technical solutions in the embodiments or related technologies of this application, the accompanying drawings used in the description of the embodiments or related technologies will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0025] Figure 1 This is a schematic diagram of the structure of the torque bolt disclosed in the embodiments of this application. Figure 1 ;

[0026] Figure 2 This is a schematic diagram of the structure of the torque bolt disclosed in the embodiments of this application. Figure 2 ;

[0027] Figure 3This is a schematic diagram of the structure of the threaded sleeve disclosed in the embodiments of this application;

[0028] Figure 4 This is a schematic diagram of the screw section disclosed in an embodiment of this application.

[0029] Among them, 100 is the threaded sleeve, 110 is the ratchet groove, 120 is the mounting hole, 130 is the external thread, and 140 is the relief groove;

[0030] 200 is the screw part, 210 is the ratchet tooth, 220 is the insert groove, and 230 is the tightening groove;

[0031] 300 is an elastic element;

[0032] 400 is a limit component. Detailed Implementation

[0033] This application discloses a torque bolt to solve the problem of base cracking or bolt sleeve dislodgement caused by excessive preload in bolted connections.

[0034] The embodiments will now be described with reference to the accompanying drawings. Furthermore, the embodiments shown below do not limit the scope of the invention as described in the claims. Additionally, the complete contents of the structures represented in the embodiments below are not limited to those necessary for the solution of the invention as described in the claims. It should be noted that, for ease of description, only the parts relevant to the invention are shown in the drawings. Unless otherwise specified, the embodiments and features described in this application can be combined with each other.

[0035] Combination Figures 1-4 The torque bolt disclosed in this application includes a threaded sleeve portion 100, a screw portion 200, and an elastic element 300. The end face of the first end of the threaded sleeve portion 100 is provided with at least two ratchet grooves 110, and each ratchet groove 110 is arranged sequentially around the central axis of the threaded sleeve portion 100. The threaded sleeve portion 100 is provided with a mounting hole 120, and the circumferential outer wall of the second end of the threaded sleeve portion 100 is provided with an external thread 130 for threaded engagement with the base threaded sleeve or nut. The first end of the screw portion 200 is provided with ratchet teeth 210 that engage with the ratchet grooves 110, and the second end of the screw portion 200 is disposed in the mounting hole 120. The elastic element 300 is disposed in the mounting hole 120 and sleeved on the second end of the screw portion 200. The elastic element 300 is used to apply a force to the screw portion 200 so that the ratchet teeth 210 engage with the ratchet grooves 110, thereby allowing the threaded sleeve portion 100 and the screw portion 200 to rotate synchronously.

[0036] In the initial state, the ratchet 210 of the screw part 200 is engaged in the ratchet groove 110 under the pull of the elastic element 300. During use, the rotation of the screw part 200 drives the threaded sleeve part 100 to rotate together and be screwed into the threaded hole of the threaded sleeve or nut. During the tightening process, when the torque provided by the friction force of the external thread 130 is greater than the torque limit of the torque bolt, the elastic element 300 deforms, the ratchet 210 extends out from the ratchet groove 110, and the screw part 200 rotates and slips relative to the threaded sleeve part 100, while the threaded sleeve part 100 stops rotating, thus achieving torque limitation. In addition, the cooperation between the ratchet groove 110 and the ratchet 210 can also achieve reverse locking to prevent loosening due to vibration or other reasons. When disassembling, twisting the screw part 200 in the reverse direction will drive the threaded sleeve part 100 to be unscrewed together.

[0037] Compared to existing technologies, this application discloses a torque-controllable torque bolt. This torque bolt can achieve effective automatic control of preload without relying on a torque wrench and matching spring washers or flat washers. This prevents excessive force on the installation point, reduces the types of tools required, lowers the skill requirements for operators, and solves the problem of cracking of the substrate or dislodging of the threaded sleeve in plastic or fiberglass substrates due to excessive preload. It is suitable for fastening scenarios where torque accuracy requirements are not high but failure and cracking are prone to occur. In addition, this torque bolt has the characteristics of being detachable and reusable and having reverse self-locking properties, which can effectively protect the installation point while improving assembly efficiency and connection reliability.

[0038] Combination Figure 3 The ratchet groove 110 has a first sidewall and a second sidewall arranged at an angle, with the first sidewall extending along the axial direction of the threaded sleeve portion 100 and the second sidewall arranged opposite to the mounting hole 120, so as to restrict the automatic rotation of the screw portion 200 in the loosening direction by the first sidewall and realize reverse self-locking; and during the process of manually loosening the torque bolt, the ratchet 210 can push the first sidewall to drive the threaded sleeve portion 100 to rotate together.

[0039] In some embodiments, combined with Figure 1 and Figure 2 , Figure 1 The diagram in the middle shows the engagement of the ratchet 210 with the initial ratchet groove 110. Figure 2 This is a schematic diagram showing the engagement of the ratchet 210 with the ratchet groove 110 adjacent to the initial ratchet groove 110. Figure 1 and Figure 2The clockwise direction is the tightening direction of the torque bolt. Along the tightening direction of the torque bolt, the groove depth of the ratchet groove 110 decreases sequentially. The groove depth refers to the maximum dimension of the ratchet groove 110 along the axial direction of the threaded sleeve portion 100. When the ratchet 210 engages with ratchet grooves 110 of different depths, the degree of compression on the elastic element 300 is also different. The shallower the groove depth, the greater the degree of compression on the elastic element 300, and the greater the rotational resistance of the screw portion 200. This can achieve reliable torque limiting and prompt the operator to prevent mistaken operation. In addition, during the tightening process, when the preset torque is exceeded, the screw portion 200 rotates relative to the threaded sleeve portion 100, and the ratchet 210 rotates and moves into the adjacent shallower ratchet groove 110, thereby further compressing the elastic element 300. At this time, the elastic element 300 can provide a certain preload force to achieve the anti-loosening effect. Figure 2 The α in the figure represents the difference in groove depth between two adjacent ratchet grooves 110.

[0040] Combination Figure 1 and Figure 2 The mounting hole 120 can be formed on the end face of the second end of the threaded sleeve portion 100. To facilitate the installation of the elastic element 300, a limiting element 400 is provided at the second end of the screw portion 200, and the limiting element 400 is disposed within the mounting hole 120. The first end of the elastic element 300 abuts against the bottom wall of the mounting hole 120, and the second end of the elastic element 300 abuts against the limiting element 400. During the tightening process, when the preset torque is exceeded, the screw portion 200 moves axially and drives the limiting element 400 to move to compress the elastic element 300.

[0041] In order to achieve the installation of the limit component 400, combined with Figure 4 A mounting groove 220 for the insertion of the limiting member 400 can be provided at the second end of the screw portion 200. For example, the limiting member 400 can be a retaining spring. During assembly, the second end of the screw portion 200 is first inserted into the mounting hole 120, then the elastic member 300 is fitted onto the second end of the screw portion 200, and finally the limiting member 400 is snapped into the mounting groove 220 to complete the installation. The structure is simple and easy to manufacture. Alternatively, the limiting member 400 and the second end of the screw portion 200 can be threaded together. For example, the limiting member 400 can be a limiting nut. During assembly, the second end of the screw portion 200 is first inserted into the mounting hole 120, then the elastic member 300 is fitted onto the second end of the screw portion 200, and finally the limiting member 400 is threaded onto the second end of the screw portion 200 to complete the installation. Assembly is convenient.

[0042] Specifically, the aforementioned elastic element 300 can be a linear spring or a disc spring assembly. Figure 1 and Figure 2 The diagram shows a technical solution where the elastic element 300 is a linear helical spring; the disc spring assembly solution is that multiple disc springs are together sleeved on the outer wall of the second end of the screw part 200.

[0043] In existing technologies, threaded connections primarily rely on friction to prevent loosening. Under vibration, the preload is easily lost, leading to connection failure. By introducing thread-locking adhesives such as anaerobic adhesives, the thread gaps can be cured and filled, forming a high-strength bond and providing excellent anti-loosening properties.

[0044] To prevent the adhesive from overflowing or being squeezed out during tightening due to application of adhesive to smooth threaded surfaces, resulting in insufficient effective adhesive retention, some embodiments disclosed in this application provide an adhesive reservoir structure for accommodating thread-locking adhesive at at least one of the tooth flank and tooth root of the external thread 130. Exemplarily, this reservoir structure can be at least one of the micro-textures, pits, or grooves formed on the surface of the external thread 130. By providing an adhesive reservoir structure on the surface of the external thread 130, the thread-locking adhesive can be effectively accommodated and stored within the reservoir structure during the application process. When the torque bolt is screwed into the threaded sleeve or nut, the adhesive in the reservoir structure can continuously replenish the meshing surface, ensuring the filling rate and retention of the thread-locking adhesive within the threaded pair, thereby enhancing the adhesion strength and bonding force of the thread-locking adhesive after curing, and improving the anti-loosening reliability and vibration resistance of the bolt connection.

[0045] Specifically, in some embodiments, the adhesive storage structure may include a spiral microgroove extending along the helical direction of the external thread 130 and disposed at at least one of the flank and root of the external thread 130. The spiral microgroove allows the thread-locking adhesive to form a continuous adhesive layer channel along the axial direction of the thread sleeve portion 100, and the cross-sectional shape of the spiral microgroove may be semi-circular, triangular, or rectangular, etc., which is not limited in this application. In this embodiment, on the one hand, the spiral structure of the spiral microgroove conforms to the relative movement trajectory when the torque bolt is screwed into the thread sleeve or nut, which can reduce the tightening resistance and achieve smooth screwing in; on the other hand, when the torque bolt is subjected to lateral vibration or axial tension, the continuous spiral adhesive layer can provide uniform and continuous damping force and shear strength, effectively preventing the torque bolt from rotating relative to the thread sleeve or nut.

[0046] In other embodiments, since the stress at the root of the external thread 130 is relatively small, the adhesive storage structure may include multiple annular recesses disposed at the root of the external thread 130 to reduce the weakening of the structural strength of the external thread 130 and ensure the static load strength of the torque bolt. At the same time, the annular recesses are evenly distributed in the circumferential direction of the thread sleeve portion 100 and are arranged at intervals along the axial direction of the screw portion 200 so that the thread-locking adhesive is more evenly distributed in the circumferential direction, ensuring the effective utilization rate of the thread-locking adhesive.

[0047] In some other embodiments, the adhesive storage structure includes a knurled texture on the tooth flank surface of the external thread 130. The knurled texture can increase the micro-roughness of the surface of the external thread 130, thereby increasing the contact area between the thread-locking adhesive and the surface of the external thread 130, which can significantly improve the bonding adhesion of the adhesive after curing and enhance the anti-loosening effect.

[0048] The surfaces of the aforementioned threaded sleeve 100, threaded rod 200, and elastic element 300 can be coated with anti-corrosion coatings through processes such as Dacromet coating or galvanizing to provide corrosion protection for the torque bolt as a whole, thereby meeting the application requirements in outdoor or corrosive environments.

[0049] Combination Figure 3 The outer circumferential wall of the first end of the threaded sleeve 100 is a smooth rod structure, and the outer circumferential wall of the second end is provided with the aforementioned external thread 130. To ensure the integrity of the forming of the external thread 130, the outer circumferential wall of the first end of the threaded sleeve 100 is provided with a relief groove 140, which is located between the smooth rod structure and the external thread 130. In addition, the relief groove 140 can also function as an anti-loosening groove, and anti-loosening is achieved by cooperating with an anti-loosening washer.

[0050] Combination Figure 1 and Figure 2 The end face of the first end of the screw part 200 is provided with a tightening groove 230 for the insertion of disassembly and assembly tools. The tightening groove 230 is configured as a slotted groove or a cross groove, which is used to cooperate with the corresponding slotted or cross cutter to realize the tightening and loosening operation of the torque bolt.

[0051] The terms "first" and "second," etc., used in the specification and claims of this application are used to distinguish different objects, not to describe a specific order, and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion. For example, a process, method, system, product, or device that includes a series of steps or units may include steps or units not listed, but rather steps or units not listed. Additionally, in the description of embodiments in this application, "a plurality of" means two or more.

[0052] The above description of the disclosed embodiments enables those skilled in the art to make or use this application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of this application. Specific technical means in some embodiments may be incorporated, in whole or in part, into another embodiment unless explicitly excluded by another embodiment. Therefore, this application is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A torque bolt, characterized in that, include: The threaded sleeve (100) has at least two ratchet grooves (110) on the end face of its first end, and each ratchet groove (110) is arranged sequentially around the central axis of the threaded sleeve (100). The threaded sleeve (100) has a mounting hole (120), and the circumferential outer wall of the second end of the threaded sleeve (100) is provided with an external thread (130). The screw part (200) has a first end provided with a ratchet (210) that meshes with the ratchet groove (110), and the second end of the screw part (200) is provided in the mounting hole (120); An elastic element (300) is disposed in the mounting hole (120) and sleeved on the second end of the screw portion (200), and the elastic element (300) is used to apply force to the screw portion (200) so that the ratchet (210) engages with the ratchet groove (110).

2. The torque bolt as described in claim 1, characterized in that, Along the tightening direction of the torque bolt, the groove depth of each ratchet groove (110) decreases sequentially, and the groove depth is the maximum dimension of the ratchet groove (110) along the axial direction of the threaded sleeve (100).

3. The torque bolt as described in claim 1, characterized in that, The mounting hole (120) is opened on the end face of the second end of the threaded sleeve (100), and a limiting member (400) is provided at the second end of the screw (200), and the limiting member (400) is disposed in the mounting hole (120); The first end of the elastic element (300) abuts against the bottom wall of the mounting hole (120), and the second end of the elastic element (300) abuts against the limiting element (400).

4. The torque bolt as described in claim 3, characterized in that, The second end of the screw portion (200) is provided with an insert groove (220) for the limiting member (400) to be inserted. Alternatively, the limiting member (400) may be threaded into the second end of the screw portion (200).

5. The torque bolt as described in claim 3, characterized in that, The elastic element (300) is a linear spring or a disc spring assembly.

6. The torque bolt as described in claim 1, characterized in that, The external thread (130) has a glue storage structure on its tooth side and / or tooth root for accommodating thread-locking glue.

7. The torque bolt as described in claim 6, characterized in that, The adhesive storage structure includes spiral microgrooves extending along the helical direction of the external thread (130) and disposed on the tooth side and / or tooth root of the external thread (130), wherein the cross-sectional shape of the spiral microgrooves is semi-circular, triangular or rectangular; And / or, the glue storage structure includes a plurality of annular recesses disposed at the root of the external thread (130), the annular recesses being uniformly arranged around the circumference of the threaded sleeve (100) and spaced apart along the axial direction of the threaded sleeve (100). And / or, the adhesive storage structure includes a knurled texture provided on the tooth flank surface of the external thread (130).

8. The torque bolt as described in claim 1, characterized in that, The outer surfaces of the threaded sleeve (100), the screw (200), and the elastic element (300) are covered with an anti-corrosion coating.

9. The torque bolt as claimed in claim 1, characterized in that, The outer circumferential wall of the first end of the threaded sleeve (100) is provided with a relief groove (140).

10. The torque bolt as claimed in claim 1, characterized in that, The end face of the first end of the screw part (200) is provided with a tightening groove (230) for the disassembly and assembly tools to be inserted.

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