Friction increasing ring, non-metal locking nut and locking method of non-metal locking nut

Abstract

The invention relates to a friction-increasing ring (1) for increasing friction force, which is an improvement on the existing non-metal locking nut, and is characterized in that an inner bump (3) is not arranged on one side of an inner ring (6) of a ring seat sheet, and at least one fan-shaped (4), crescent (5) or eccentric circle-shaped (26) inner bump (3) is arranged on the other side of the inner ring (6) of the ring seat sheet, so that the asymmetric friction-increasing ring (1) is formed. And the non-metal locking nut (13) is riveted on the step (14) to form a new non-metal locking nut (13). The anti-loosening method is characterized in that the friction increasing ring (1) transversely pushes and axially extrudes the bolt external thread (24) towards one side, so that the non-metal locking nut internal thread (23) is not coaxial on the bolt external thread (24), the non-metal locking nut internal thread (23) is fully inclined between gaps (22), two sawtooth corrugated peaks and valleys are meshed in a staggered tooth mode after spiral expansion, the pre-tightening force is increased, the friction coefficient is increased, the friction force is large, and the anti-loosening performance is greatly improved. The anti-loosening technology and the anti-loosening product are used for anti-loosening fastening of various vibration mechanical devices and facilities.

Description

Technical Field

[0001] The invention relates to the field of anti-loosening fasteners, in particular to a friction-increasing ring on a non-metallic locking nut that increases friction, the non-metallic locking nut and an anti-loosening method thereof. Background Art

[0002] The existing ISO7041 standard is the standard for non-metallic hexagonal lock nuts, "Type 2 Non-metallic Insert Hexagonal Lock Nut", which is characterized by a special non-metallic ring fixed in the nut body, and a tightening step at the top of the nut for fixing the non-metallic ring. The non-metallic ring is pressed and fixed under the tightening step at the top of the nut body. The non-metallic ring described herein undergoes elastic deformation during the tightening process, creating a new thread that expands the helix, increasing contact area and friction. During vibration, the elastic restoring force of the non-metallic ring counteracts the tendency to loosen. Because it increases friction between the nut and bolt, it is referred to in this case as a "friction-increasing ring." Due to its radially symmetrical structure, the internal threads of the nut and the external threads of the bolt are actually parallel, helical tooth surfaces. This friction-increasing ring inevitably rubs against each other under intense vibration conditions, leading to nut loosening and de-rotation. In actual testing, with an amplitude of ±0.8mm, a frequency of 12.5Hz, and a preload of 68kN, only about 20% of the residual axial force remained after 2000 vibration cycles. This far exceeds the requirements for tightening and preventing loosening of mechanical equipment and facilities under intense vibration. Given the axially symmetrical design of the nut, friction cannot change its uniform distribution along the circumference, resulting in spiraling, slippage, and de-rotation of the internal threads of the nut and the external threads of the bolt. Summary of the Invention

[0003] In order to overcome the shortcomings of the above-mentioned existing technologies, this case aims to provide a friction-increasing ring, a non-metallic locking nut and its anti-loosening method that can greatly improve its anti-loosening performance under strong vibration conditions, ensure that the internal thread of the nut is firmly locked on the external thread of the bolt, and will not rotate, slip or loosen.

[0004] The friction-enhancing ring provided in this case is composed of an annular ring seat and an inner convex block, wherein the concave arc of the inner convex block faces the axis of the non-metallic locking nut, and the convex arc of the inner convex block is connected to the inner ring of the annular ring seat as a whole, and is characterized by:

[0005] There is no inner convex block on one side of the inner ring of the annular ring seat; at least one inner convex block is provided on the other side of the inner ring of the annular ring seat, and the inner convex block and the inner convex block are connected to form a friction-increasing ring, which is asymmetrical.

[0006] The inner convex block may be fan-shaped, crescent-shaped, or eccentrically circular;

[0007] The outer circumference of the friction-increasing ring is such that it can be radially inserted into the inward-turned rivet edge at one end of the nut;

[0008] The thickness h of the friction-increasing ring is 1 / 2 to 2 times, including 1 / 2 or 2 times, the pitch of the internal thread of the non-metallic locking nut;

[0009] The inner diameter of the friction-increasing ring seat is larger than the major diameter D of the internal thread of the non-metallic locking nut;

[0010] The inner diameter of the inner convex block on the friction-increasing ring is smaller than the minor diameter d of the inner thread of the non-metallic locking nut;

[0011] The arc of the inner convex block is π / 6 to 5π / 6;

[0012] Preferably, the curvature of the inner convex block is π / 3 to 2π / 3;

[0013] The friction-increasing ring is made of elastic non-metallic material;

[0014] The elastic non-metal includes nylon, plastic, rubber, or other non-metallic materials.

[0015] The non-metallic locking nut structure processed by the above-mentioned friction-increasing ring is characterized in that: the circumference of the friction-increasing ring is radially embedded in the inverted rivet edge at one end of the non-metallic locking nut body, between the step of the non-metallic locking nut body, and is fixed by pressure rivets, wherein the inner diameter of the inverted rivet edge can just fit the outer diameter of the friction-increasing ring and is radially riveted; the thickness of the friction-increasing ring is sufficient to be axially riveted between the inverted rivet edge at one end of the non-metallic locking nut and the step, and cannot rotate or loosen when the non-metallic locking nut is pre-tightened.

[0016] The installation and use structure of the non-metallic locking nut described in this case is: pass the tail end of the bolt through the screw holes of the lower fastener and the upper fastener, and screw the non-metallic locking nut described in this case on the exposed tail end of the screw. The asymmetric non-metallic ring is squeezed into a new thread by the bolt spiral, and the circular ring plane at one end of the non-metallic locking nut contacts the surface around the screw hole of the upper fastener for pre-tightening.

[0017] The anti-loosening method of the non-metallic locking nut described in this case is: the inner arc edge of the inner protrusion at the upper end of the pre-tightened non-metallic locking nut is tightly stretched after being pre-tightened by the outer thread of the bolt, squeezing the outer thread of the bolt that is engaged in the uppermost circle of the bolt, and exerting a certain downward friction pressure in the axial direction. At the same time, because the inner diameter of the inner protrusion is smaller than the large diameter D of the inner thread of the non-metallic locking nut, that is, the outer diameter of the valley bottom of the outer thread of the bolt, the screw is pushed to one side laterally. At this time, the non-metallic locking nut is not coaxial with the screw, and the threads are obliquely engaged, that is, the non-metallic locking nut is Due to the downward friction pressure on the screw and the asymmetric thrust to one side, the non-metallic locking nut is tilted on the screw. Within the allowable range of the gap between the internal thread of the non-metallic locking nut and the external thread of the bolt, one side of the non-metallic locking nut is high and the other side is low, and the non-metallic locking nut is fully tilted, so that after the internal thread of the non-metallic locking nut and the external thread of the bolt are spirally unfolded, they form two sawtooth corrugations with peaks and valleys staggered teeth. As the preload force increases, the friction coefficient is very large, and the friction force between the two is also very large, which greatly improves the anti-loosening performance.

[0018] Compared with the prior art, the present invention does not add any parts or any costs. Instead, the inner protrusion on the other side of the symmetry is removed and replaced with an asymmetric friction-increasing ring structure. The parallel rubbing friction of the threads is replaced by the staggered meshing of sawtooth corrugations. The friction force increases with the pre-tightening force, and the locking structure tends to infinity. The asymmetric non-metallic locking nut is locked on the bolt, and its anti-loosening performance is significantly improved by several times compared with the existing symmetrical non-metallic locking nuts, achieving an unexpected anti-loosening effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 This is one of the main views of the friction-increasing ring of the present invention;

[0020] Figure 2 yes Figure 1 Left view of;

[0021] Figure 3 yes Figure 1 Right view of;

[0022] Figure 4 yes Figure 1 An oblique view of the non-metallic locking nut of the friction-increasing ring;

[0023] Figure 5 This invention Figure 4 A front view of the non-metallic locking nut;

[0024] Figure 6 yes Figure 5 A top view of

[0025] Figure 7 This is the second main view of the friction-increasing ring of the present invention;

[0026] Figure 8 yes Figure 7 Left view of;

[0027] Figure 9 yes Figure 7 Right view of;

[0028] Figure 10 yes Figure 7 An oblique view of the non-metallic locking nut of the friction-increasing ring;

[0029] Figure 11 This invention Figure 10 A front view of the non-metallic locking nut;

[0030] Figure 12 yes Figure 11 A top view of

[0031] Figure 13 This is the third main view of the friction-increasing ring of the present invention;

[0032] Figure 14 yes Figure 13 Left view of;

[0033] Figure 15 yes Figure 13 Right view of;

[0034] Figure 16 yes Figure 13 An oblique view of the non-metallic locking nut of the friction-increasing ring;

[0035] Figure 17 This invention Figure 16 A front view of the non-metallic locking nut;

[0036] Figure 18 yes Figure 17 A top view of

[0037] Figure 19 This invention Figure 4 、 Figure 10 、 Figure 16 Schematic diagram of the usage structure of the non-metallic locking nut.

[0038] In the picture:

[0039] 1. Friction-increasing ring 2. Left-hand or right-hand helical thread

[0040] 3. Inner convex 4. Fan-shaped

[0041] 5. Crescent-shaped 6. Inner ring of the ring seat

[0042] 7. Inward riveting edge 8. Thickness of friction ring h

[0043] 9. Inner diameter of the ring seat 10. Large diameter of the nut internal thread D

[0044] 11. Inner radius of the inner convex block 12. Minor diameter of the inner thread of the nut d

[0045] 13. Non-metallic lock nut 14. Step

[0046] 15. Non-metallic lock nut body 16. Bolt

[0047] 17. Bolt head 18. Screw

[0048] 19. Upper fastener 20. Lower fastener

[0049] 21. Screw hole 22. Clearance

[0050] 23. Internal thread of non-metallic lock nut 24. External thread of bolt

[0051] 25. Circular plane 26. Eccentric circular

[0052] 27. Ring seat

[0053] α, the angle through the center of the circle corresponding to the arc of the inner convex block DETAILED DESCRIPTION

[0054] The present invention will be further described with reference to the accompanying drawings and embodiments:

[0055] The present invention Figure 1 、 Figure 7 、 Figure 13 In the figure, the friction-increasing ring 1 is composed of a circular ring seat ring 2 and an inner convex block 3. The concave arc of the inner convex block 3 faces the axis of the non-metallic locking nut 13, and the convex arc of the inner convex block 3 is connected to the inner ring 6 of the circular ring seat ring as a whole.

[0056] There is no inner convex block on one side of the annular ring seat inner ring 6; on the other side of the annular ring seat inner ring 6, there is at least one, two, or more inner convex blocks 3, which are connected to each other as a whole to form a friction-increasing ring 1, and the friction-increasing ring 1 is asymmetrical.

[0057] The inner protrusions 3 are respectively fan-shaped 4, crescent-shaped 5, or eccentric circular 26.

[0058] Figure 1 、 Figure 2 、 Figure 3 The inner convex block 3 is fan-shaped 4, and the inwardly protruding part thereof is a fan-shaped structure.

[0059] Figure 7 、 Figure 8 、 Figure 9 The inner convex block 3 is crescent-shaped 5, and the inwardly protruding part thereof is a crescent-shaped structure.

[0060] Figure 13 、 Figure 14 、 Figure 15 The inner convex block 3 is an eccentric circular shape 26, and the inwardly protruding portion thereof is an eccentric circular structure.

[0061] The outer circumference of the friction-increasing ring 1 is just large enough to be radially embedded in the inverted rivet edge 7 at one end of the non-metallic locking nut body 15 .

[0062] The thickness h of the friction-increasing ring 1 is 1 / 2 to 2 times the pitch of the internal thread 23 of the non-metallic locking nut 13, including 1 / 2 or 2 times; such as 1 / 2, 3 / 4, 1 time or 2 times.

[0063] The inner diameter 9 of the seat ring of the friction-increasing ring 1 is larger than the major diameter D of the internal thread 23 of the non-metallic locking nut.

[0064] The inner diameter of the inner protrusion 3 on the friction-increasing ring 1 is smaller than the minor diameter d of the inner thread 23 of the non-metallic locking nut.

[0065] The curvature of the inner convex block 3 is π / 6 to 5π / 6, that is, the corresponding angle through the center of the circle is 30° to 150°, such as 30°, or 60°, or 90°, or 120°, or 150°; preferably, the curvature of the inner convex block 3 is π / 3 to 2π / 3, and the corresponding central angle is 60° to 120°.

[0066] The friction-increasing ring 1 is made of elastic non-metal; the elastic non-metal includes nylon, plastic, rubber, or other non-metal.

[0067] Figure 4 、 Figure 10 、 Figure 16 In the figure, the friction-increasing ring 1 has a fan-shaped 4, a crescent-shaped 5, and an eccentric circular 26 inner protrusion 3, and the asymmetric non-metallic locking nut 13 structure is processed.

[0068] The circumference of the friction-increasing ring 1 is radially embedded in the inverted rivet edge 7 at one end of the non-metallic locking nut body 15 and between the step 14 of the non-metallic locking nut body 15, and fixed by pressure rivets. The inner diameter of the inverted rivet edge 7 can just fit the outer diameter of the friction-increasing ring 1 and is radially riveted. The thickness of the friction-increasing ring 1 is sufficient to be axially riveted between the inverted rivet edge 7 at one end of the non-metallic locking nut 13 and the step 14, and cannot rotate or loosen when the non-metallic locking nut 13 is pre-tightened.

[0069] Figure 19In the figure, the installation and use structure of the asymmetric non-metallic locking nut 13 of this case is as follows: the tail end of the bolt 16 is passed through the screw holes 21 of the lower fastener 20 and the upper fastener 19, and the asymmetric non-metallic locking nut 13 of this case is screwed onto the exposed tail end of the screw rod 18. The inner side of the asymmetric non-metallic ring is spirally squeezed into a new internal thread by the bolt, and the circular ring plane 25 at the other end of the non-metallic locking nut 13 contacts the surface around the screw hole 21 of the upper fastener 19 for pre-tightening.

[0070] like Figure 19 for Figure 4 、 Figure 10 、 Figure 16 The three asymmetric anti-loosening methods of the non-metallic locking nuts 13 shown respectively are all the same: the inner arc edge of the inner protrusion 3 at the upper end of the non-metallic locking nut 13 after pre-tightening is tightly stretched after being pre-tightened by the bolt outer thread 24, squeezing the bolt outer thread 24 engaged with the top circle of the bolt 16, and having a certain downward friction pressure in the axial direction. At the same time, because the inner radius of the inner protrusion 3 is smaller than 1 / 2 of the large diameter D of the non-metallic locking nut inner thread 23, if the thread gap 22 is negligible, that is, smaller than 1 / 2 of the outer diameter of the peak of the bolt outer thread 24, and the screw 18 is pushed to one side laterally, the non-metallic locking nut 13 and the screw 18 are not engaged. Coaxial, oblique thread engagement, that is, the non-metallic locking nut 13 is tilted on the screw 18 due to the downward friction pressure and the asymmetric thrust to one side. The non-metallic locking nut 13 is high on one side and low on the other side within the allowable range between the gap between the non-metallic locking nut internal thread 23 and the bolt external thread 24, and is fully tilted, so that after the non-metallic locking nut internal thread 23 and the bolt external thread 24 are spirally unfolded, they are engaged with two sawtooth corrugations with peaks and valleys. As the preload force increases, the friction coefficient is very large, and the friction between the two is also very large, which greatly improves the anti-loosening performance.

[0071] According to the ISO16130-2015 lateral vibration standard test, for a grade 8 non-metallic locking nut, after 2000 vibrations at an amplitude of ±0.8mm, a frequency of 12.5Hz, a preload of about 68KN, the residual axial force of the symmetrical non-metallic locking nut before improvement is about 20%, while the residual axial force of the asymmetrical non-metallic locking nut after improvement is as high as over 90%.

[0072] Compared with the prior art, the present invention does not add any parts or any costs. Instead, the inner protrusion 3 on the other side of the symmetry is removed and replaced with an asymmetric friction-increasing ring 1 structure. The parallel rubbing friction of the threads is changed to the staggered meshing of sawtooth corrugations. The friction force increases with the pre-tightening force, and the locking structure tends to infinity, so that the asymmetric non-metallic locking nut 13 is locked on the bolt 16. Its anti-loosening performance is significantly improved by several times compared with the existing symmetrical non-metallic locking nuts, and an unexpected anti-loosening effect is achieved.

[0073] The friction-increasing ring 1 described in this case can be extruded by a mold, or punched out in one go by a punch, or cut by a laser cutting machine, and then the friction-increasing ring 1 is fixed between the inward-turned rivet edge 7 and the step 14 by a press. The processing and use methods of the improved, asymmetric, non-metallic locking nut 13 are the same as those of the existing symmetrical ordinary non-metallic locking nuts, which are all mature technologies. The structure, working principle, material, specifications, and selection methods of the improved asymmetric non-metallic locking nut 13 should be mastered by ordinary technicians in this field, so they will not be repeated here.

[0074] The friction-increasing ring 1, the non-metallic locking nut 13 and the anti-loosening method thereof of the present invention are suitable for anti-loosening and fastening of vibrating mechanical equipment and facilities in the fields of railways, bridges, mining, petrochemicals, aviation, aerospace, navigation, iron towers, wind power, nuclear power, vehicles, military industry, robots, etc.

[0075] It should be noted that the "front", "back", "big", "small", "inside", "outside", "left", "right", "up", "down", "up", "down", "convex", "concave", "high", "low" and other indications of orientation, area, position, or aspect relationship described in the present invention are based on the orientation, area, position, or direction relationship shown in the accompanying drawings, and are only for the convenience of describing the case and simplifying the description. In actual application, the orientation, position or direction can be interchangeably rotated and reversed, rather than indicating or implying that the device or part referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it cannot be understood as a limitation to the case. The terms installation and connection should be understood in a broad sense. For example, an integrated connection can be a direct connection or an indirect connection through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms in the case can be understood according to specific circumstances.

[0076] The above description is only a preferred embodiment of the present invention and is not intended to limit the scope of protection of the present invention. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A friction-increasing ring, comprising an annular ring seat (27) and an inner convex block (3), wherein the concave arc of the inner convex block (3) faces the axis of the non-metallic locking nut (13), and the convex arc of the inner convex block (3) is connected to the inner ring (6) of the annular ring seat as a whole, characterized in that: On one side of the inner ring (6) of the annular ring seat piece, no inner convex block (3) is provided; on the other side of the inner ring (6) of the annular ring seat piece, at least one inner convex block (3) is provided, and the inner convex block (3) and the inner convex block (3) are connected to each other as a whole to form a friction-increasing ring (1), and the friction-increasing ring (1) is asymmetrical.

2. The friction-increasing ring according to claim 1, characterized in that: The inner convex block (3) may be fan-shaped (4), crescent-shaped (5), or eccentric circular (26).

3. The friction-increasing ring according to claim 1, characterized in that: The outer circumference of the friction-increasing ring (1) is such that it can be radially embedded in the inverted rivet edge (7) at one end of the non-metallic locking nut (13).

4. The friction-increasing ring according to claim 1, characterized in that: The thickness h(8) of the friction-increasing ring is 1 / 2 to 2 times, including 1 / 2 or 2 times, the pitch of the internal thread of the non-metallic locking nut.

5. The friction-increasing ring according to claim 1, characterized in that: The inner diameter (9) of the friction-increasing ring seat is larger than the major diameter D of the internal thread (23) of the non-metallic locking nut; and the inner diameter (11) of the inner protrusion on the friction-increasing ring (1) is smaller than the minor diameter d of the internal thread (23) of the non-metallic locking nut.

6. The friction-increasing ring according to claim 1, characterized in that: The radian of the inner convex block is π / 6 to 5π / 6.

7. The friction-increasing ring according to claim 1, characterized in that: The material of the friction-increasing ring (1) is elastic non-metallic.

8. The friction-increasing ring according to claim 7, characterized in that: The elastic non-metal includes nylon, plastic, rubber, or other non-metallic materials.

9. The non-metallic locking nut (13) processed by the friction-increasing ring according to claim 1 is characterized in that: The circumference of the friction-increasing ring (1) is radially embedded in the inverted rivet edge (7) at one end of the non-metallic locking nut body (15) and between the step (14) of the non-metallic locking nut body (15), and is fixed by pressure riveting, wherein the inner diameter of the inverted rivet edge (7) can just fit the outer diameter of the friction-increasing ring (1) and is radially riveted; the thickness h (8) of the friction-increasing ring is sufficient to be axially riveted between the inverted rivet edge (7) at one end of the non-metallic locking nut (13) and the step (14), and cannot rotate or loosen when the non-metallic locking nut (13) is pre-tightened.

10. The non-metallic locking nut according to claim 9, characterized in that: The tail end of the bolt (16) is passed through the screw holes (21) of the lower fastener (20) and the upper fastener (19), and the non-metallic locking nut (13) is screwed onto the exposed tail end of the screw rod (18). The asymmetric non-metallic ring is spirally squeezed into a new thread by the bolt (16), and the circular ring plane (25) at one end of the non-metallic locking nut (13) contacts the surface around the screw hole (21) of the upper fastener (19) to be pre-tightened.

11. The method for preventing a non-metallic locking nut from loosening according to claim 9, characterized in that: The inner arc edge of the upper inner convex block (3) of the pre-tightened non-metallic locking nut (13) is tightly stretched after being pre-tightened by the bolt outer thread (24), squeezing the bolt outer thread (24) of the uppermost circle of the bolt (16) in meshing, and having a certain downward friction pressure in the axial direction. At the same time, because the inner diameter (11) of the inner convex block is smaller than the large diameter D of the non-metallic locking nut inner thread (23), that is, the outer diameter of the bottom of the bolt outer thread (24), the screw (18) is pushed to one side laterally. At this time, the non-metallic locking nut (13) and the screw (18) are not coaxial, and the threads are obliquely meshed, that is, the non-metallic locking nut (13) is on the screw ( 18) due to the downward friction pressure and the asymmetric thrust to one side, the non-metallic locking nut (13) is tilted on the screw (18), and the non-metallic locking nut (13) is high on one side and low on the other side within the allowable range between the gap (22) between the non-metallic locking nut internal thread (23) and the bolt external thread (24), and is fully tilted, so that after the non-metallic locking nut internal thread (23) and the bolt external thread (24) are spirally unfolded, they are engaged with two sawtooth corrugations with peaks and valleys. As the preload force increases, the friction coefficient is very large, and the friction force between the two is also very large, thereby greatly improving the anti-loosening performance.

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