A shrink nut assembly

Abstract

A shrinkage anti-loose nut assembly, comprising: a wedge nut, a mortise nut and a bolt, the mortise nut is rotated to a certain position of the bolt, the wedge nut is rotated to insert the protrusion into the gap between the nut body and the nut body, the nut body prevents the protrusion from moving outward, the thrust of the inner diameter of the protrusion presses the nut body, the nut body bends inward and shrinks, the thread on the nut body presses the bolt to increase the friction force to prevent loosening, when disassembling, the wrench is used to fix the mortise nut, the driving device drives the wedge nut to retreat and rotate, the protrusion is pulled out of the gap between the nut body and the nut body, the nut body returns to the original state, the wedge nut is removed, the driving device drives the mortise nut to retreat and rotate again, and the mortise nut is removed.

Description

[0001] Field of expertise:

[0002] This relates to the field of nut anti-loosening. Background technology:

[0003] Common mechanical anti-loosening methods include traditional methods such as double nuts, washers, and spring washers, as well as foreign publicly disclosed technologies such as double-washer anti-loosening, threaded anti-loosening, and metal or non-metal locking anti-loosening. There is also the undisclosed concave-convex method from Japanese company Hardlock. Although Hardlock claims its concave-convex nut principle originates from the wedge principle of ancient Chinese woodworking, the nuts imported to China do not show any trace of the wedge principle; instead, they only employ an eccentric locking anti-loosening principle. While ancient Chinese woodworking techniques also include hollow mortise, tenon, and wedge locking joints, these are difficult to disassemble. Modern bolts use tenons, and nuts use mortises, but without wedges, using threads. This paper introduces a low-tech, simple, and easily disassembled mortise, tenon, and wedge structure shrink-fit anti-loosening nut assembly. Summary of the Invention:

[0004] Existing expansion bolts have a proven anti-loosening function, using outward thrust to deform and expand the object, thus preventing loosening. Conversely, anti-loosening nut assemblies use inward thrust to deform and contract the object, including: wedge washers or wedge nuts, mortise nuts, and bolts.

[0005] The wedge washer mentioned is a regular washer with a conical tube protrusion or a cylindrical tube protrusion 3 added to one end (the wedge washer can also achieve the purpose of preventing loosening. When installing, the wedge washer is in front and the nut is behind, but disassembly is difficult). Alternatively, the wedge nut is a regular nut with a conical tube protrusion or a cylindrical tube protrusion 3 added to one end. The thickness of the end of the protrusion 3 is greater than the thickness of the top of the recessed cavity, and the thickness of the top of the protrusion is less than the thickness of the end of the recessed cavity. It is also better for the wedge nut to have greater rigidity than the nut, which is an interference fit.

[0006] The aforementioned mortise nut is a regular nut body with a concave or convex concave tube at one end, forming a nut body 7 to nut body 8 gap. The thickness of the top of the concave cavity is smaller than that of the end of the protrusion, while the thickness of the end of the concave cavity is larger than that of the top of the protrusion. Furthermore, the mortise nut is more elastic than the wedge nut, and it belongs to the interference fit category.

[0007] Multiple radial slits 9 can also be made on the nut body 8 inside the concave cavity of the conical tube or the concave cavity of the cylindrical tube.

[0008] The nut 5 is rotated to a certain position on the bolt and fixed with a wrench. The wedge nut 1 is rotated and the protrusion 3 is inserted into the gap between the nut body 7 and the nut body 8. The thrust of the inner diameter 4 of the protrusion presses against the nut body 8, causing the nut body 8 to bend and shrink inward. The thread 6 on the nut body 8 presses against the bolt 10 to increase friction and prevent loosening. The nut and wedge nut are locked in a certain position on the bolt. With high precision in the fit, a satisfactory anti-loosening effect can be obtained.

[0009] Due to the need for bolt versatility and manufacturing precision, current nuts have relatively large tolerances in their internal threads. This, coupled with the nut's high rigidity and low compressive elasticity, inevitably results in inconsistent anti-loosening effects. Using an eccentric wedge nut in conjunction with a mortise nut overcomes these shortcomings. An eccentric mortise nut is defined as a protrusion 3 slightly offset to one side from the center of the nut 1.

[0010] Alternatively, a centered wedge nut and an eccentric mortise nut can be used to overcome the disadvantages of large fit tolerance and high nut rigidity with low compressive elasticity. An eccentric mortise nut is a nut whose gap between nut body 7 and nut body 8 is slightly offset to one side from the center of mortise nut 5.

[0011] Alternatively, the thread of the nut can be a tapered thread hole, with the thread gradually widening from the top of the nut body 8 to the end of the nut 5, overcoming the disadvantages of large fit tolerance and high nut rigidity with low compressive elasticity.

[0012] Alternatively, a partially tapered threaded hole can be used with the nut, where the top of the nut is a tapered threaded hole and the end of the nut is a standard thread, overcoming the disadvantages of large fit tolerances and high nut rigidity with low compressive elasticity.

[0013] Alternatively, an eccentric wedge nut can be used in conjunction with a symmetrical mortise nut, or a symmetrical wedge nut can be used in conjunction with an eccentric mortise nut. The mortise nut may have a tapered threaded hole or a partially tapered threaded hole. This overcomes the disadvantages of large fit tolerances and high nut rigidity with low compressive elasticity. Attached image description:

[0014] Appendix Figure 1 Front and side views of a wedge nut (attached).

[0015] Appendix Figure 2 Front and side views of the mortise nut (attached).

[0016] Appendix Figure 3 Combined attached diagram.

[0017] Explanation of icon numbers:

[0018] 1. Wedge nut; 2. Wedge nut thread; 3. Protrusion; 4. Protrusion inner diameter; 5. Woven nut thread; 6. Nut body; 7. Nut body; 8. Nut body opening; 9. Bolt; 10. Detailed implementation method:

[0019] Install a nut 5 on the bolt rod 10. The drive device drives the nut 5 to rotate to achieve the pre-tightening force, or the drive device drives the nut 5 to rotate to a certain position on the bolt 10 and fix it with a wrench. The drive device drives the wedge nut 1 to rotate. The protrusion 3 is inserted into the gap between the nut body 7 and the nut body 8. Since the thickness of the inner end of the protrusion 3 is greater than that of the outer end of the recess, and the wedge nut is more rigid than the nut, the nut body 7 prevents the protrusion 3 from moving outward. The inner diameter 4 of the protrusion presses the nut body 8 inward. The nut body 8 bends inward and the threaded hole shrinks. The thread 6 on the nut body 8 presses the bolt 10 to increase friction and prevent loosening.

[0020] During disassembly, due to the large clamping force between the concave and convex parts, the wedge nut is driven to rotate backward, and the nut rotates along with it, causing damage to the threads. Therefore, a wrench is used to fix the nut 5, and the drive device drives the wedge nut 1 to rotate backward. The protrusion 3 is pulled out of the gap between the nut body 7 and the nut body 8, and the nut body 8 returns to its original state. The wedge nut 1 is removed, and the drive device drives the nut 5 to rotate backward again to remove the nut 5.

Claims

1. A shrink-lock nut assembly, characterized in that, A lock nut assembly is a tapered or partially tapered threaded hole that uses inward thrust to deform and shrink an object. It includes wedge nuts, mortise nuts, and bolts. The wedge nut is a regular nut with a tapered tube protrusion added to one end. The thickness of the protrusion's end is greater than the thickness of the recessed top, while the thickness of the protrusion's top is less than the thickness of the recessed end. Furthermore, the wedge nut is more rigid than a mortise nut and has an interference fit with the tapered or cylindrical recessed part of the mortise nut. The mortise nut described is either an eccentric or centered mortise nut. A conical or cylindrical tube recess is added to one end of a standard nut body. Multiple radial slits are cut inside the nut body within the conical or cylindrical tube recess. The thickness at the top of the recess is less than the thickness at the end of the protrusion, while the thickness at the end of the recess is greater than the thickness at the top of the protrusion. Furthermore, the mortise nut has greater elasticity than a wedge nut. The threaded hole is one of a tapered threaded hole or a partially tapered threaded hole, and it is interference-fitted with the conical tube protrusion of the wedge nut. A nut is installed on the bolt rod. The drive device drives the nut to rotate to achieve the pre-tightening force. The drive device drives the wedge nut to rotate, and the protrusion is inserted into the gap of the nut body. Since the thickness of the inner end of the protrusion is greater than that of the outer end of the recess, and the wedge nut is more rigid than the nut, the nut body prevents the protrusion from moving outward. The inner radial direction of the protrusion presses the nut body inward, and the nut body bends inward and the threaded hole shrinks. The threads on the nut body press the bolt to increase friction and prevent loosening.

2. The shrink-locking nut assembly as described in claim 1, characterized in that, An eccentric wedge nut is used in conjunction with a symmetrical mortise nut. An eccentric wedge nut is one in which the protrusion is slightly off-center from the center of the nut.

3. The shrink-locking nut assembly as described in claim 1, characterized in that, Use a center wedge nut and an eccentric mortise nut together. An eccentric mortise nut is a nut whose gap is slightly offset to one side from the center of the mortise nut.

4. The shrink-locking nut assembly as described in claim 1, characterized in that, The thread used in mortise nuts is a tapered threaded hole, with the thread gradually widening from the end to the tip of the mortise nut.

5. A shrink-locking nut assembly as described in claim 1, characterized in that, The thread of the nut is a partially tapered thread, with a tapered threaded hole at the end and a standard thread at the top.

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