Stop screw pair connecting structure capable of increasing torque by means of energy

Abstract

The utility model belongs to the technical field related to mechanical assembly parts, and provides a lock screw pair connecting structure and a bolt assembly capable of increasing torque by means of energy, which comprise a bolt and a nut, one end of the bolt is provided with a fixed end, and the outer side wall of the bolt is uniformly provided with external threads. An internal thread meshed with the external thread is arranged on the inner side wall of the nut; the other end of the bolt is movably provided with a bolt head through a connecting part, the distance and the angle of external threads on the outer side wall of the bolt head are adjusted, the connecting part comprises a lock catch A and a lock catch B, the lock catch A is arranged at the connecting end of the bolt, the lock catch B is arranged at the connecting end of the bolt head, and the bolt head is movably connected with the lock catch A. The distance and the angle of the outer threads on the outer side wall of the bolt are consistent; according to the utility model, when the nut is rotated under the action of external force, the lock catch A and the lock catch B are mutually engaged and positioned to form a thread offset, so that TZ is effectively greater than the target torque Tm of 80%, the torque is effectively increased, and the anti-loosening purpose is achieved.

Description

Technical Field

[0001] The utility model belongs to the technical field related to mechanical assembly parts, and particularly relates to an anti-loosening screw pair connection structure with energy borrowing and torque increasing. Background Technique

[0002] A screw is a commonly used threaded fastening fitting in mechanical assembly. It can be tightened through a tightening tool to connect two mechanical components together to play a fixing role. However, since the machine usually vibrates during operation, common anti-loosening structures include punching and riveting on the nut end face, applying glue on the thread, using a castle nut with an opening pin, using a stop washer, connecting with a wire in series, using a double nut, using a spring washer, a caulked self-locking nut, a nylon insert nut, etc.

[0003] Among them, the anti-loosening margin of the existing Tang's left and right double-thread anti-loosening structure is 82%, and the anti-loosening margin of the Nissan eccentric nut is 80%. Therefore, when the sub-connection structure in this structure forms a thread step difference, by increasing the torque, the purpose of effectively achieving an anti-loosening margin of 80% can be achieved.

[0004] In the prior art, for example, Chinese Patent No. 115711257A discloses a dynamic screw with energy borrowing and torque increasing. A split locking member is provided on the screw. By providing threads with equal pitch on the circumferential surfaces of the locking member, the mating part and the tightening part, and an included angle is provided between the mating part and the locking member. When the mating part rotates in the reverse direction, there is a height difference between the threads of the mating part and the locking member, and they cannot be used in cooperation. Although this structure reduces the pressure received on the cross-section of the thread pair, in the state without a nut installed, the locking member and the tightening part are completely separated. And even if a nut is provided, if the length of the nut is short, the locking member is extremely easy to fall off, there is a lack of abutment between the locking member and the mating part, and the locking member is prone to floating and moving outwards, affecting the reliability of energy borrowing and torque increasing, making it difficult to stably prevent loosening and not being convenient for batch promotion and use. Content of the Utility Model

[0005] The utility model provides an anti-loosening screw pair connection structure and a bolt assembly with energy borrowing and torque increasing to solve the above problems existing in the prior art.

[0006] An embodiment of the utility model provides an anti-loosening screw pair connection structure with energy borrowing and torque increasing, including a bolt, a bolt head and a nut. One end of the bolt is provided with a fixed end, and external threads are uniformly arranged on the outer side wall of the bolt. The other end of the bolt is movably provided with a bolt head through a connecting component; the pitch and angle of the external threads on the outer side wall of the bolt head are the same as those of the external threads on the outer side wall of the bolt. The nut is sleeved on the bolt through internal threads and external threads to form a complete fixing component, where the pitch and angle of the internal threads and external threads are the same to ensure the matching degree.

[0007] In the above technical solution, the bolt head is movably arranged at the end of the bolt through a connecting component. During use, the external thread on the bolt head and the channel on the external thread on the bolt are in two states: misaligned and connected, which can ensure that the nut can be smoothly installed on the bolt; when the nut is loose, due to the opposite rotation direction, the external thread on the bolt head is disconnected from the external thread on the bolt, resulting in misalignment, thereby achieving the purpose of dynamic retreat by increasing torque by energy. The overall structure is simple, reasonable and relatively stable. The bolt head and the bolt are clamped together by the connecting component, which is convenient for storage and transportation. When in use, the bolt head will not fall off accidentally.

[0008] Preferably, the connecting component includes a lock buckle A and a lock buckle B, the lock buckle A is arranged at the connecting end of the bolt, and the lock buckle B is arranged at the connecting end of the bolt head, the lock buckle A is made of an upper raised engaging body with an inverted L-shaped vertical section, and the lock buckle B is made of a lower raised engaging body with an L-shaped vertical section; the lock buckle B is movably engaged in the lock buckle A.

[0009] In the above technical solution, the upwardly protruding portion of the lock catch A can be engaged with the downwardly protruding portion of the lock catch B to achieve a movable connection between the lock catch A and the lock catch B, that is, to achieve a movable connection between the bolt head and the bolt.

[0010] Preferably, a movable sector-shaped gap is provided between the contact surfaces of the lock buckle A and the lock buckle B.

[0011] In the above technical solution, the rotation of the bolt head can change the size and position of the fan-shaped gap in the activity chamber, so as to adjust the connection and misalignment between the external thread on the bolt head and the external thread on the bolt.

[0012] Preferably, a straight groove is provided at the end of the bolt head away from the connecting component.

[0013] In the above technical solution, the I-shaped groove facilitates the user to rotate the bolt head by a screwdriver to adjust the position and size of the fan-shaped gap in the activity chamber, thereby achieving the purpose of connecting the external thread on the bolt head and the external thread on the bolt, so as to facilitate the user to reversely rotate the nut or withdraw the nut.

[0014] Preferably, the diameter of the bolt head is consistent with the diameter of the bolt.

[0015] Preferably, a first bevel is provided at the end of the bolt head, and a second bevel is provided at the bottom of the inner wall of the nut, and the inclination angles of the first bevel and the second bevel are consistent.

[0016] Preferably, the bolt head turns into place along the corner to restore the normal thread line, which is convenient for disassembly.

[0017] In summary, the utility model provides an anti-loosening screw pair connection structure with energy-borrowing torque increase, and its beneficial effects are:

[0018] (1) By providing a movable connection bolt head at the end of the bolt, when the nut on the bolt loosens and retracts, due to the change in the fan-shaped clearance between the bolt head and the bolt during movement, the external threads on the bolt and the external threads on the bolt head are misaligned, so as to achieve the purpose of effectively preventing loosening and increasing torque by borrowing energy;

[0019] (2) The overall structure is simple and reasonable, with high applicability and flexibility, and is convenient for operation and use. Description of the Drawings

[0020] Figure 1 is the front view structural schematic diagram of the loosening prevention screw pair connection structure for increasing torque by borrowing energy according to the embodiment of the present utility model;

[0021] Figure 2 is based on the present utility model Figure 1 of the embodiment of the top view structural schematic diagram;

[0022] Figure 3 is based on the present utility model Figure 1 of the embodiment of the cross-sectional structural schematic diagram;

[0023] Figure 4 is the disassembled structural schematic diagram of the loosening prevention screw pair connection structure for increasing torque by borrowing energy according to the embodiment of the present utility model;

[0024] Figure 5 is the usage state structural schematic diagram of the loosening prevention screw pair connection structure for increasing torque by borrowing energy according to the embodiment of the present utility model.

[0025] Among them, the names corresponding to the reference numerals in the drawings are:

[0026] 101, bolt; 102, fixed end; 103, external thread; 104, bolt head; 105, lock A; 106, lock B; 107, movable fan-shaped clearance; 108, nut; 109, gasket; 110, flat slot. Detailed Embodiment

[0027] In order to more clearly illustrate the technical solutions in the embodiments of the present utility model or the prior art, the following will briefly introduce the present utility model in combination with the drawings and the description of the embodiments or the prior art. Obviously, the following description of the drawing structure is only some embodiments of the present utility model. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings. It should be noted here that the description of these embodiment modes is used to help understand the present utility model, but does not constitute a limitation to the present utility model.

[0028] The following will be combined with Figure 1 toFigure 5 Further description of the utility model.

[0029] Embodiment 1:

[0030] Referring to Figure 1 to Figure 4 As shown, this embodiment provides an anti-loosening screw pair connection structure 101 for borrowing energy and increasing torque. One end of the bolt 101 is provided with a fixed end 102. External threads 103 are uniformly arranged on the outer side wall of the bolt 101. The other end of the bolt 101 is movably provided with a bolt head 104 through a connecting component;

[0031] In the above embodiment, the bolt head 104 and the bolt 101 are engaged together through a connecting component.

[0032] The pitch and angle of the external threads 103 on the outer side wall of the bolt head 104 are the same as those of the external threads 103 on the outer side wall of the bolt 101.

[0033] In the above embodiment, the bolt head 104 is movably arranged at the end of the bolt 101 through a connecting component. During use, the channels of the external threads 103 on the bolt head 104 and the external threads 103 on the bolt 101 are in two states of dislocation and connection, that is, it can effectively ensure the smooth installation of the nut 108 on the bolt 101; when the nut 108 loosens and retracts, due to the opposite rotation direction, the external threads 103 on the bolt head 104 are disconnected from the external threads 103 on the bolt 101, resulting in dislocation, achieving the purpose of the dynamic retraction position of borrowing energy and increasing torque.

[0034] Embodiment 2:

[0035] Combining the above embodiments, as Figure 2 to Figure 4 As shown, the above connecting component includes a lock A 105 and a lock B 106. The lock A 105 is arranged at the connecting end of the bolt 101, and the lock B 106 is arranged at the connecting end of the bolt head 104; the lock A 105 is made of an upper convex engaging body with an inverted L-shaped vertical section, and the lock B 106 is made of a lower convex engaging body with an L-shaped vertical section; the lock B 106 is movably engaged in the lock A 105.

[0036] The upward protruding part of the lock A 105 can be engaged with the downward protruding part of the lock B 106 to realize the movable connection of the lock A 105 and the lock B 106, that is, to achieve the movable connection of the bolt head and the bolt; as Figure 3 As shown, the interface of the horizontal protruding part is in a semi-circular structure, and the diameter of this semi-circular structure is the same as the diameters of the bolt 101 and the bolt head 104.

[0037] During the specific operation process, a movable sector gap is provided between the contact surfaces of the latch A105 and the latch B106. The rotation of the bolt head 104 can change the size and position of the movable sector gap, so as to adjust the connection and dislocation of the external thread 103 on the bolt head 104 and the external thread 103 on the bolt 101.

[0038] Specifically, the angular change of the above-mentioned movable sector gap is as follows:

[0039] The bolt 101 and the bolt head 104 are disconnected from each other, and then the movable connection is realized through the latch A105 and the latch B106;

[0040] Latches A105 and B106 are respectively arranged at the cross-section between the bolt 101 and the bolt head 104;

[0041] For example, when the nut 108 is rotated clockwise and sleeved on the bolt 101, the protruding part of the latch A105 is separated from the protruding part of the latch B106, so that the external thread 103 is connected, and the nut 108 can be smoothly rotated and sleeved;

[0042] When the nut 108 is rotated counterclockwise and withdrawn from the bolt 101, the protruding part of the latch A105 bites and positions with the protruding part of the latch B106, causing the external thread 103 at the bolt 101 and the bolt head 104 to be misaligned, increasing the resistance torque, that is, improving the efficiency of energy borrowing and torque increasing of the bolt 101 as a whole;

[0043] An inclination angle γ is provided on the cutting surface of the abutting end of the latch A and the latch B in the above structure to facilitate the mutual engagement of the latch A and the latch B, as Figure 3 and Figure 4 shown;

[0044] Where the increased resistance torque is set as T N , the total torque of energy borrowing and torque increasing is T Z , and the preset tightening degree of the bolt 101 is T Y ;

[0045] T Z =T Y +T N ;

[0046] The above-mentioned TZ is effectively greater than 80% of the target torque Tm, that is, the purpose of energy borrowing and torque increasing is achieved.

[0047] During the actual use process, as Figure 3 and Figure 4 shown:

[0048] The bolt assembly includes a bolt 101, a bolt head 104, and a nut 108. The nut 108 is sleeved on the bolt 101 through internal and external threads 103. Both the internal and external threads are composed of right-handed threads M×S. Here, M×S represents the thread direction of the right-handed thread, and S represents the pitch of the right-handed thread. As Figure 3 shown, the helix angle of this right-handed thread is set to α;

[0049] The bolt 101 and the bolt head 104 are disconnected from each other. A latch A 105 and a latch B 106 are respectively arranged on their end faces. When the nut 108 is screwed onto the bolt 101 in the forward direction, the latch B 106 is driven to be screwed into the latch A 105. Let the angle of rotation during the screwing of the nut be β, that is, the rotation angle β;

[0050] According to the rotation angle β and the pitch S, the thread step difference △ can be calculated:

[0051] △ = βxS / 360°

[0052] The above-mentioned thread step difference refers to the height difference of the disconnected threads when the bolt head 104 abuts against the bolt 101;

[0053] Among them, the height of the above-mentioned nut is set to H. When the knob is at the abutting part of the bolt and the bolt head, it can effectively accommodate the two separated bodies and cooperate with the engagement of the latch A and the latch B. In addition, it can also not accommodate the abutting part of the bolt and the bolt head. The bolt head can be movably engaged on the latch A through the latch B and will not fall off.

[0054] Specifically as Figure 5 shown:

[0055] Set an observation point on the thread line on the outer wall of the bolt 101, and identify one of the broken thread lines as X. Set points U, V, and W on this broken thread line;

[0056] When the nut is loosened and rotated, it drives the bolt head to rotate. The latch B abuts and engages on the latch A. The point U on the latch B moves to the point W, and a position difference occurs in the thread X. The position difference between the point W and the point V is the thread break position difference, which can effectively prevent the nut from loosening and rotating.

[0057] On the other hand, when the nut is screwed in, it drives the bolt head to rotate, and the latch B rotates, making the threads connected and eliminating the break position difference, so that the nut can be normally screwed in.

[0058] The overall structure of the above embodiment is simple and reasonable, easy to disassemble, and convenient for popularization and use.

[0059] To ensure ease of use, a flat slot may be provided at the end of the bolt head 104 away from the connecting component. This flat slot can be set as a flat slot. The flat slot facilitates the user to rotate the bolt head 104 with a screwdriver to fix the bolt head, adjust the position and size of the fan-shaped gap in the activity room, and achieve the purpose of connecting the external thread 103 on the bolt head 104 and the external thread 103 on the bolt 101, so as to facilitate the user to rotate the nut 108 in the reverse direction or remove the nut 108 for easy disassembly.

[0060] Embodiment 3:

[0061] On the other hand, a loosening-preventing screw pair connection structure with energy borrowing and torque increasing is provided, as Figure 3 and Figure 4 shown, including the loosening-preventing screw pair connection structure 101 with energy borrowing and torque increasing and the nut 108 as described above. One end of the bolt 101 is provided with a fixed end 102, and external threads 103 are uniformly arranged on the outer side wall of the bolt 101. Internal threads engaging with the external threads 103 are provided on the inner side wall of the nut 108. The other end of the bolt 101 is movably provided with a bolt head 104 through a connecting component. The pitch and angle of the external threads 103 on the outer side wall of the bolt head 104 are the same as those of the external threads 103 on the outer side wall of the bolt 101.

[0062] The above nut 108 is sleeved on the bolt 101 through internal threads and external threads 103, and the bolt head 104 is engaged with the bolt 101 to form a complete fixing component, where the pitch and angle of the internal threads and external threads 103 are the same to ensure the fitting degree.

[0063] To ensure the firmness of use, a gasket 109 is also assembled on the bolt 101, or the nut 108 and the gasket 109 are synchronously provided. The gasket 109 is sleeved on the bolt 101 and is located between the nut 108 and the fixed end 102. The gasket 109 can effectively reduce the loss caused by the collision and friction between the nut 108 and the fixed end 102 of the bolt 101.

[0064] In the above-mentioned multiple embodiments, the screw pair connection structure is composed of a bolt 102, a bolt head 104, a nut 108, and a gasket 109. The purpose of preventing loosening is achieved by increasing torque. The bolt 102 and the bolt head 104 are separated from each other, and the cross-section between them is a fan-shaped rotation angle, and a lock A and a lock B are respectively provided.

[0065] Specifically, when the nut 108 is rotated by an external force, the lock A and the lock B are engaged and positioned with each other to form a thread step difference, effectively increasing the torque to achieve the purpose of preventing loosening.

[0066] Among them, the anti-loosening margin of Tang's left and right double-thread anti-loosening structure in the prior art is 82%, and the anti-loosening margin of Nissan's eccentric nut is 80%. Therefore, when the auxiliary connection structure in this structure is used to form the thread difference, the purpose of an anti-loosening margin of 80% can be effectively achieved by increasing the torque.

[0067] The advantage of borrowing external interference energy is that no matter whether the external interference is invading in the forward or reverse direction, its energy can be borrowed, thus turning harm into benefit, and it will not only not loosen but tighten instead.

[0068] (1) Forward interference, the nut will be tightened further and will not loosen;

[0069] (2) Reverse interference: The nut rotates to borrow energy, driving the bolt head to rotate, forming a thread break, increasing torque and preventing loosening.

[0070] The physical process of borrowing energy to increase torque is described in detail:

[0071] When external interference energy invades, the nut will rotate and tend to loosen, causing harm; the nut will drive the bolt head to rotate through the matching thread; the rotation angle gradually changes from 0 to β, and the lock buckle B slides into the lock buckle A along the inclination angle γ. The lock buckle A and the lock buckle B bite each other, and the back of the bite surface is the other side of the bolt head at a negative 180 degrees. After the rotation angle β, they are separated from the abutment, forming a thread difference, and it has been deduced that △=βxS / 360°. The thread difference △ is the basis of the torque increase. When the rotation angle torque value increases, the torque increase increases accordingly, turning harm into benefit, so reliable anti-loosening can be achieved.

[0072] The utility model provides an anti-loosening screw pair connection structure and a bolt assembly for increasing torque by using energy. The overall structure is simple, the principle is well-founded, the scheme is feasible, the anti-loosening is reliable, the total anti-loosening torque TZ is effectively greater than 80% of the target torque Tm, the disassembly is flexible, maintenance is convenient, and the structure is reusable. The cost is low and the structure is conducive to popularization and use.

[0073] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the utility model, rather than to limit it. Although the utility model has been described in detail with reference to the aforementioned embodiments, ordinary technicians in this field should understand that they can still modify the technical solutions recorded in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not make the essence of the corresponding technical solution deviate from the scope of the technical solution of the embodiments of the utility model.

Claims

1. A loosening-preventing screw pair connection structure with energy borrowing and torque increasing, characterized in that, It includes a bolt (101), a bolt head (104) and a nut (108). By means of external interference, the nut can rotate, generating a thread step difference to increase torque and prevent loosening. One end of the bolt (101) is provided with a fixed end (102), and external threads (103) are evenly arranged on the outer side wall of the bolt (101). Internal threads that engage with the external threads (103) are provided on the inner side wall of the nut (108). The other end of the bolt (101) is movably provided with a bolt head (104) through a connecting component, and the diameter of the bolt head (104) is the same as the diameter of the bolt (101). The pitch and angle of the external threads (103) on the outer side wall of the bolt head (104) are the same as those of the external threads (103) on the outer side wall of the bolt (101).

2. The loosening prevention screw pair connection structure with energy borrowing and torque increasing according to claim 1, characterized in that, The connecting component includes a lock A (105) and a lock B (106). The lock A (105) is arranged at the connecting end of the bolt (101), and the lock B (106) is arranged at the connecting end of the bolt head (104). The lock A (105) is made of an upper convex clamping body with an inverted L-shaped vertical section, and the lock B (106) is made of a lower convex clamping body with an L-shaped vertical section. The lock B (106) is movably clamped in the lock A (105), and a movable sector gap is provided between the contact surfaces of the lock A (105) and the lock B (106).

3. The anti-loosening screw pair connection structure with energy borrowing and torque increasing according to claim 1, characterized in that, A flat head slot is provided at the end of the bolt head (104) far from the connecting component.

4. The anti-loosening screw pair connection structure with energy borrowing and torque increasing according to claim 1, characterized in that, A first inclined surface is provided at the end of the bolt head (104), and a second inclined surface is provided at the bottom of the inner side wall of the nut (108). The inclination angles of the first inclined surface and the second inclined surface are the same.

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