Removable and reusable self-locking nut

Abstract

This invention relates to the field of fastener technology, specifically disclosing a removable and reusable self-locking nut. It includes an inner ring with internal threads, a stepped hole on the inner ring, the axial direction of which coincides with the radial direction of the inner ring. A slider is slidably connected within the smaller hole of the stepped hole, and a screw is threaded onto the slider. Rotation of the screw moves the slider axially along the stepped hole. An outer ring is fixedly fitted around the inner ring, and the outer ring has a through hole directly opposite the stepped hole. The head of the screw simultaneously contacts the inner wall of the outer ring and the bottom of the larger hole in the stepped hole. This solution addresses the problem that current locking nuts cannot be reused after long-term disassembly.

Description

Technical Field

[0001] This invention relates to the field of fastener technology, and more specifically to a removable, reusable, self-locking nut. Background Technology

[0002] Locking nuts are widely used in axial fastening, such as locking nuts installed at the end of high-speed rotating spindles. However, as time goes by, conventional locking nuts will loosen due to the high-speed rotation of the spindle and the vibration during the spindle's operation. Furthermore, in the current market, most locking nuts cannot be reused after loosening, reducing their service life. Taking the most common YSK locking nut as an example, this type of locking nut has annular grooves machined on both its inner and outer walls. A through hole is machined along the axial direction of the locking nut, penetrating both the inner and outer annular grooves and the nut itself. A screw can be installed in the through hole. The two annular grooves give the nut a certain degree of axial elasticity, the magnitude of which is determined by the screw in the through hole. When the nut locks the spindle, the screw brings the distance between the two annular grooves closer, effectively creating two different thread pitches on one nut, ensuring that the nut will not loosen after locking. However, after long-term use, the elasticity of this type of locking nut becomes irreversible, essentially changing from elastic deformation to plastic deformation. Once the locking nut loosens or needs to be disassembled and reinstalled after prolonged use, it will lose its elasticity and fail to function properly, thus becoming unusable. Summary of the Invention

[0003] The present invention aims to provide a removable and reusable self-locking nut to solve the problem that current locking nuts cannot be reused after disassembly after long-term use.

[0004] To achieve the above objectives, the present invention adopts the following technical solution:

[0005] A removable and reusable self-locking nut includes an inner ring with internal threads, a stepped hole on the inner ring, the axial direction of the stepped hole coinciding with the radial direction of the inner ring, a slider slidably connected in the small hole of the stepped hole, a screw threadedly connected to the slider, and the slider moving along the axial direction of the stepped hole when the screw is rotated. An outer ring is fixedly sleeved on the outside of the inner ring, and the outer ring has a through hole facing the stepped hole. The head of the screw is simultaneously in contact with the inner wall of the outer ring and the bottom of the large hole of the stepped hole.

[0006] The principle and advantages of this solution are as follows: In practical applications, after connecting the self-locking nut to the spindle, to prevent the nut from loosening in the future, the screw can be tightened through the through hole. Tightening the screw causes the slider to move along the stepped hole to approach the spindle. The screw stops rotating after the spindle is pressed against the spindle. Compared with existing technologies, this solution limits the loosening of the nut by increasing the pressure of the slider against the spindle. If the nut is to loosen, the slider must first be pushed. However, the slider is directly connected to the screw, and the axial space of the screw is restricted by the outer ring and the large hole on the stepped hole, preventing axial movement. After installation, the nut achieves self-locking, greatly reducing the probability of the slider loosening after pressing against the spindle. This ensures that the nut is locked after installation, guaranteeing that it will not easily loosen even if affected by spindle vibration.

[0007] Furthermore, since the nut will not loosen easily, when the spindle needs to be inspected and the nut needs to be removed, since the nut is not damaged, you can first tighten the screw so that the slider is no longer pressed against the spindle, and then tighten the outer ring, which will drive the inner ring to rotate and remove it from the spindle. The nut after removal is still an intact nut and can be reused.

[0008] In addition, when disassembling the locking nut using this solution, after loosening the last screw, the wrench or other screw-tightening tools do not need to be removed. Simply change the rotation of the screw-tightening tool to its revolution around the inner circle to disassemble the locking nut, making the disassembly of the locking nut simple and convenient.

[0009] Preferably, as an improvement, a second screw is threaded onto the end face of the inner ring, and the bottom end of the second screw can abut against the slider.

[0010] Beneficial effect: When screw two is tightened, screw two presses against the radial slider from the axial direction of the nut, and the slider and screw two restrain each other, further ensuring that the nut will not loosen under long-term tightening.

[0011] Preferably, as an improvement, the slider is provided with a limiting groove, the cross-section of which is V-shaped or trapezoidal, and the second screw can be pressed against the limiting groove, with the second screw in contact with the bottom and side surfaces of the limiting groove.

[0012] Preferably, as an improvement, the bottom surface of the limiting groove is inclined, and the depth of the bottom surface of the limiting groove is shallower as it gets closer to the center of the inner ring.

[0013] Beneficial effects: This design limits the inclination of the bottom surface of the groove, further increasing the restraining force between the slider and screw two, and further preventing the nut from loosening.

[0014] Preferably, as an improvement, the number of sliders is multiple, and all sliders are evenly distributed along the inner circumference.

[0015] Beneficial effects: Multiple evenly distributed sliders provide more uniform clamping to the spindle, resulting in better anti-loosening effect. After the nut and spindle are tightened, there is a slight gap in the thread fit between the spindle and the nut. After the nut and spindle are fitted together, the spindle may slightly shift to one side. At this time, the position of the spindle can be adjusted by tightening the screw to move the slider.

[0016] Preferably, as an improvement, the end face of the slider facing the center of the inner ring is provided with threads, and the threads on the slider and the internal threads of the inner ring can form a continuous thread groove. By providing threads on the slider, the threads on the slider can fit more tightly with the threads on the spindle, further improving the locking effect. Attached Figure Description

[0017] Figure 1 This is a longitudinal sectional view of an embodiment of the present invention.

[0018] Figure 2 for Figure 1 The right view.

[0019] Figure 3 for Figure 1 The longitudinal section view of the slider in the image.

[0020] Figure 4 for Figure 3 AA section view in the image. Detailed Implementation

[0021] The following detailed description illustrates the specific implementation method:

[0022] The reference numerals in the accompanying drawings include: Screw 1, slider 2, limiting groove 21, outer ring 3, inner ring 4, and screw 2 5.

[0023] The basic implementation examples are as follows: Figures 1 to 4 As shown, the detachable and reusable self-locking nut includes an inner ring 4 with internal threads and an outer ring 3 fixedly sleeved on the inner ring 4. The outer ring 3 is cylindrical, and a headless screw is fixed to the bottom of the outer ring 3 to form a fixed connection between the outer ring 3 and the inner ring 4.

[0024] The outer circumferential surface of the inner ring 4 is machined with a stepped hole, the axial direction of which coincides with the radial direction of the inner ring 4. A slider 2 is slidably connected to the small hole of the stepped hole along the axial direction of the hole. The end face of the slider 2 facing the center of the inner ring 4 is machined with threads, and the threads of the slider 2 can form a continuous thread groove with the internal thread of the inner ring 4. In this embodiment, there are three sliders 2, and all sliders 2 are evenly distributed along the circumference of the inner ring 4.

[0025] Screw 1 is threaded onto slider 2. When screw 1 rotates, slider 2 moves axially along the stepped hole. A through hole is machined on the outer ring 3, directly opposite the stepped hole. The head of screw 1 simultaneously contacts the inner wall of the outer ring 3 and the bottom of the large hole in the stepped hole. In this embodiment, to facilitate the movement of slider 2, the cross-section of slider 2 is a circle on the inside and a square on the outside.

[0026] An auxiliary screw hole is machined on the end face of the inner ring 4, and a screw 5 is threaded onto the auxiliary screw hole; a limiting groove 21 is machined on the outer wall of the slider 2. The cross-section of the limiting groove 21 is V-shaped or trapezoidal. In this embodiment, the cross-section of the limiting groove 21 is an isosceles trapezoid. The auxiliary screw hole is directly opposite the limiting groove 21, and the screw 5 can be pressed against the limiting groove 21. The screw 5 is in contact with the bottom and side surfaces of the limiting groove 21.

[0027] The bottom surface of the limiting groove 21 is inclined, and the depth of the bottom surface of the limiting groove 21 is shallower as it gets closer to the center of the inner ring 4.

[0028] In this embodiment, the inner ring 4, slider 2, screw 1 and screw 2 are all made of metal.

[0029] The specific implementation process is as follows:

[0030] After connecting the self-locking nut to the spindle, to prevent the nut from loosening in the future, screw 1 can be tightened through the through hole. Tightening screw 1 causes slider 2 to move along the stepped hole and approach the spindle. After the threads on slider 2 are engaged with the threads on the spindle, screw 1 stops rotating. All sliders 2 are engaged with the spindle in the same way. Then, screw 5 is screwed into the auxiliary screw hole until screw 5 is engaged with the limiting groove 21. Once all screws 5 are installed, the nut locking process is complete.

[0031] Compared to existing technologies, this solution restricts the loosening of the nut by adding three sliders 2 to clamp the spindle. If the nut is to loosen, the sliders 2 must first be pushed. However, the sliders 2 are directly connected to the screw 1. The axial space of the screw 1 is restricted by the outer ring 3 and the large hole on the stepped hole, preventing axial movement. At the same time, the movement of the sliders 2 is also restricted by the screw 2 5. In other words, the movement of the sliders 2 is restricted by the screw 1, the screw 2 5, and the outer ring 3. Thus, after the nut is installed, it achieves self-locking, greatly reducing the probability of the sliders 2 loosening after clamping the spindle. This ensures that the nut in this embodiment is locked after installation, guaranteeing that the nut will not easily loosen even if affected by the vibration of the spindle.

[0032] Furthermore, since the nut will not loosen easily, and the process of locking the spindle with the nut does not rely on the elastic deformation of the nut, when the spindle needs to be repaired and the nut needs to be removed, the parts on the nut will not be damaged. You can first turn screw 25 to make screw 25 exit the limiting groove 21, then turn screw 1 to make the slider 2 no longer press against the spindle, and finally turn the outer ring 3, which will drive the inner ring 4 to turn and remove it from the spindle. The nut after removal is still an intact nut and can be reused.

[0033] In addition, when disassembling the locking nut using this solution, after loosening the last screw 1, the wrench or other screw-tightening tools do not need to be removed. Simply change the rotation of the screw-tightening tool to its revolution around the inner circle 4 to disassemble the locking nut. The disassembly of the locking nut is simple and convenient.

[0034] The above descriptions are merely embodiments of the present invention, and common knowledge such as specific technical solutions and / or characteristics are not described in detail here. It should be noted that those skilled in the art can make various modifications and improvements without departing from the technical solutions of the present invention, and these should also be considered within the scope of protection of the present invention. These modifications and improvements will not affect the effectiveness of the implementation of the present invention or the practicality of the patent. The scope of protection claimed in this application should be determined by the content of its claims, and the specific embodiments described in the specification can be used to interpret the content of the claims.

Claims

1. A removable and reusable self-locking nut, comprising an inner ring with internal threads, characterized in that: The inner ring has a stepped hole, the axial direction of which coincides with the radial direction of the inner ring. A slider is slidably connected in the small hole of the stepped hole, and a screw is threadedly connected to the slider. When the screw is rotated, the slider moves along the axial direction of the stepped hole. An outer ring is fixedly sleeved on the outside of the inner ring. The outer ring has a through hole facing the stepped hole. The head of the screw is in contact with the inner wall of the outer ring and the bottom of the large hole of the stepped hole. The end face of the slider facing the center of the inner ring is machined with threads, and the threads of the slider can form a continuous thread groove with the internal thread of the inner ring. An auxiliary screw hole is machined on the end face of the inner ring, and a screw is threaded onto the auxiliary screw hole. A limiting groove is machined on the outer wall of the slider, and the auxiliary screw hole is directly opposite the limiting groove, so that the screw can be pressed against the limiting groove.

2. The detachable, reusable, self-locking nut according to claim 1, characterized in that: The cross-section of the limiting groove is V-shaped or trapezoidal, and the second screw can be pressed against the limiting groove. The second screw is in contact with the bottom and side surfaces of the limiting groove.

3. The detachable, reusable, self-locking nut according to claim 2, characterized in that: The bottom surface of the limiting groove is inclined, and the depth of the bottom surface of the limiting groove is shallower as it gets closer to the center of the inner ring.

4. The detachable, reusable, self-locking nut according to any one of claims 1-3, characterized in that: There are multiple sliders, and all sliders are evenly distributed along the inner circumference.

Images