Combined type fixed torque nut
Through the combined torque-fixed nut design, including the main nut, the screw head, the installation slot, the installation block and the connecting rod, the problem of insufficient flexibility and accuracy in the prior art is solved, and the torque flexibility and Stability meets the demand for fixed torque.
Patent Information
- Application Number
- CN202420616823.6
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-03-28
- Publication Date
- 2024-12-17
- Estimated Expiration
- 2034-03-28
AI Technical Summary
The torque breaking torque of existing fixed torque nuts is not flexible enough, and the machining accuracy is difficult to ensure, resulting in large torque deviations and poor product stability, which cannot meet the fixed torque requirements.
The combined torque-fixed nut design is adopted, including the main nut, the screw head, the installation slot, the mounting block and the connecting rod. The torque-breaking torque is changed by replacing the connecting rod, and the accuracy of the connecting rod is improved through finishing.
It achieves flexibility and stability of torque breaking, with small torque fluctuations and good product adaptability and stability.
Smart Images
Figure CN222185394U_ABST
Abstract
Description
[Technical field]
[0001] The utility model relates to the technical field of fasteners, in particular to the technical field of top torque nuts. [Background technology]
[0002] The nut is used to be screwed onto the screw or nut, and cooperates with the screw or bolt to clamp the assembly. In order to prevent the nut assembly from being damaged by excessive locking force, a fixed torque nut has been introduced. When a certain torque is reached, it cannot be screwed any further, thus ensuring the safety of the assembly.
[0003] The existing patent CN215805655U discloses a twelve-angle constant torque nut for steel structure connection, which achieves the purpose of constant torque through a breakable breaking groove. However, the breaking torque of such a constant torque nut is fixed, and it is difficult to ensure the accuracy of the breaking groove during the processing process, which leads to a large deviation in the breaking torque of the nut, poor product stability, and cannot meet the demand for constant torque. [Contents of the utility model]
[0004] The purpose of the utility model is to solve the problems in the prior art and to propose a combined constant torque nut, which can enable the nut to have a constant torque function, and the change of the twist-off torque can be achieved by replacing the connecting rod. The product has better adaptability, and the connecting rod is easy to carry out fine processing, so that the connecting rod has better precision, the twist-off torque fluctuates less, and the product stability is better.
[0005] To achieve the above-mentioned purpose, the utility model proposes a combined fixed torque nut, including a main nut, a screwing head, a mounting groove, a mounting block, and a connecting rod. A screwing head is provided above the main nut, and an avoidance hole is provided on the screwing head. The main nut, the screwing head, and the avoidance hole are all located on the same central axis. The inner diameter of the avoidance hole is larger than the inner diameter of the main nut. A plurality of vertically arranged connecting rods are provided between the main nut and the screwing head. The top and bottom ends of the connecting rods are provided with mounting blocks. The connecting rod and the mounting block are an integrated structure. The top end of the main nut and the bottom end of the screwing head are provided with a plurality of mounting grooves corresponding to the connecting rods one by one. The mounting groove is in a truncated cone shape. The inner diameter of the open end of the mounting groove is larger than the inner diameter of the bottom of the mounting groove. The mounting block is adapted to the mounting groove, and the mounting block is embedded in the mounting groove. The outer diameter of the connecting rod is smaller than the minimum diameter of the mounting block.
[0006] Preferably, the main nut and the screwing head are both in the shape of regular hexagonal prisms.
[0007] Preferably, the thickness of the mounting block is smaller than the depth of the mounting groove, the minimum diameter of the mounting block is larger than the minimum inner diameter of the mounting groove, and the maximum diameter of the mounting block is smaller than the maximum inner diameter of the mounting groove.
[0008] The beneficial effects of the utility model are as follows: the utility model arranges mounting blocks embedded in the main nut and the twisting head at both ends of the connecting rod, so that the nut can change the twist-off torque by replacing the connecting rod, and the product has better adaptability; the connecting rod is easy to be finely processed, so that the connecting rod has better precision, the twist-off torque fluctuates less, and the product stability is better.
[0009] The features and advantages of the present invention will be described in detail through embodiments in conjunction with the accompanying drawings.
Brief Description of the Drawings
[0010] Figure 1 This is a front view of the first embodiment of the combined torque-fixing nut of the utility model;
[0011] Figure 2 It is a front view of the second embodiment of the combined torque-fixing nut of the utility model.
[0012] In the figure: 1-main nut, 2-twist head, 3-connecting rod, 15-lower anti-deviation sleeve, 16-limiting ring, 20-avoidance hole, 21-installation groove, 25-upper anti-deviation sleeve, 26-connecting ring, 31-installation block. [Specific implementation method]
[0013] Embodiment 1:
[0014] See also Figure 1 The utility model combined fixed torque nut comprises a main nut 1, a screwing head 2, a mounting groove 21, a mounting block 31 and a connecting rod 3. A screwing head 2 is provided above the main nut 1, and an avoidance hole 20 is provided on the screwing head 2. The main nut 1, the screwing head 2 and the avoidance hole 20 are all located on the same central axis. The inner diameter of the avoidance hole 20 is larger than the inner diameter of the main nut 1. A plurality of vertically arranged connecting rods 3 are provided between the main nut 1 and the screwing head 2. The top and bottom ends of the connecting rod 3 are both provided with mounting blocks 31. The connecting rod 3 and the mounting block 31 are an integrated structure. The top end of the main nut 1 and the bottom end of the screwing head 2 are both provided with a plurality of mounting grooves 21 corresponding to the connecting rod 3 one by one. The mounting groove 21 is in a truncated cone shape. The inner diameter of the open end of the mounting groove 21 is larger than the inner diameter of the groove bottom of the mounting groove 21. The mounting block 31 is adapted to the mounting groove 21. The mounting block 31 is embedded in the mounting groove 21. The outer diameter of the connecting rod 3 is smaller than the minimum diameter of the mounting block 31.
[0015] The main nut 1 and the screwing head 2 are both in the shape of a regular hexagonal prism.
[0016] In order to ensure that the side wall of the mounting block 31 can always fit with the side wall of the mounting groove 21 and eliminate the influence of processing errors, the thickness of the mounting block 31 is smaller than the depth of the mounting groove 21, the minimum diameter of the mounting block 31 is larger than the minimum inner diameter of the mounting groove 21, and the maximum diameter of the mounting block 31 is smaller than the maximum inner diameter of the mounting groove 21.
[0017] Embodiment 2:
[0018] See also Figure 2 In order to prevent the screwing head 2 from tilting during the screwing process, a lower anti-deflection sleeve 15 is sleeved on the outside of the main nut 1. The outer part of the lower anti-deflection sleeve 15 is cylindrical. The inner hole of the lower anti-deflection sleeve 15 is adapted to the main nut 1. A limiting ring 16 is provided on the inner wall of the lower anti-deflection sleeve 15. The bottom wall of the limiting ring 16 abuts against the top wall of the main nut 1. The mounting groove 21 on the main nut 1 is located in the area surrounded by the limiting ring 16. A connecting ring 26 is provided at the bottom of the screwing head 2. An upper anti-deflection sleeve 25 is fixed on the connecting ring 26. The upper anti-deflection sleeve 25 is sleeved on the lower anti-deflection sleeve 15. The inner hole of the upper anti-deflection sleeve 25 is adapted to the lower anti-deflection sleeve 15.
[0019] Working process of this utility model:
[0020] During the working process of the combined constant torque nut of the utility model, taking the installation of the nut on the stud as an example, according to the needs, a suitable connecting rod 3 is selected, and then the main nut 1 is first screwed on the stud. When the main nut 1 contacts the fixed component, the upper and lower anti-deflection sleeves 15 (if any), the connecting rod 3, and the twisting head 2 are assembled, and then the twisting head 2 is twisted. The twisting head 2 drives the connecting rod 3 to rotate, and the connecting rod 3 drives the main nut 1 to rotate. When the torque of the main nut 1 reaches a predetermined value, the connecting rod 3 is subjected to excessive force and breaks. At this time, twisting the twisting head 2 can no longer drive the main nut 1 to rotate, thereby achieving the purpose of constant torque.
[0021] The above embodiments are intended to illustrate the present invention, not to limit the present invention. Any solution that is a simple transformation of the present invention falls within the protection scope of the present invention.
Claims
1. Combined constant torque nut, characterized by: The invention comprises a main nut (1), a screwing head (2), a mounting groove (21), a mounting block (31), and a connecting rod (3); a screwing head (2) is arranged above the main nut (1); a avoidance hole (20) is arranged on the screwing head (2); the main nut (1), the screwing head (2), and the avoidance hole (20) are all located on the same central axis; the inner diameter of the avoidance hole (20) is larger than the inner diameter of the main nut (1); a plurality of vertically arranged connecting rods (3) are arranged between the main nut (1) and the screwing head (2); the top and bottom ends of the connecting rods (3) are each provided with The mounting block (31), the connecting rod (3) and the mounting block (31) are an integrated structure. The top end of the main nut (1) and the bottom end of the screwing head (2) are both provided with a plurality of mounting grooves (21) corresponding to the connecting rods (3). The mounting grooves (21) are in a truncated cone shape. The inner diameter of the opening end of the mounting groove (21) is larger than the inner diameter of the groove bottom of the mounting groove (21). The mounting block (31) is adapted to the mounting groove (21). The mounting block (31) is embedded in the mounting groove (21). The outer diameter of the connecting rod (3) is smaller than the minimum diameter of the mounting block (31).
2. The combined constant torque nut according to claim 1, characterized in that: The main nut (1) and the screwing head (2) are both in the shape of a regular hexagonal prism.
3. The combined constant torque nut according to claim 1, characterized in that: The thickness of the mounting block (31) is smaller than the depth of the mounting groove (21), the minimum diameter of the mounting block (31) is larger than the minimum inner diameter of the mounting groove (21), and the maximum diameter of the mounting block (31) is smaller than the maximum inner diameter of the mounting groove (21).
4. The combined constant torque nut according to claim 1, characterized in that: The main nut (1) is externally sleeved with a lower anti-deflection sleeve (15), the outer portion of the lower anti-deflection sleeve (15) is cylindrical, the inner hole of the lower anti-deflection sleeve (15) is adapted to the main nut (1), a limiting ring (16) is provided on the inner wall of the lower anti-deflection sleeve (15), the bottom wall of the limiting ring (16) abuts against the top wall of the main nut (1), the mounting groove (21) on the main nut (1) is located in the area surrounded by the limiting ring (16), a connecting ring (26) is provided at the bottom of the screwing head (2), an upper anti-deflection sleeve (25) is fixed on the connecting ring (26), the upper anti-deflection sleeve (25) is sleeved on the lower anti-deflection sleeve (15), the inner hole of the upper anti-deflection sleeve (25) is adapted to the lower anti-deflection sleeve (15).