Gear type anti-loosening screw and nut

Abstract

The invention discloses a gear type locking screw and nut, and relates to the technical field of fasteners, the gear type locking screw and nut comprises a screw, a first nut and a second nut, the end, close to the second nut, of the first nut is sleeved with a gasket, and a first rack is arranged along the peripheral side of the upper end face of the gasket; the peripheral side of the second nut is sleeved with a fixed sleeve, and a second rack is arranged along the peripheral side of the lower end face of the fixed sleeve. A plurality of gears are arranged between the first rack and the second rack, and the first rack and the second rack are meshed with the gears; a fixing groove is formed in the end, away from the first nut, of the second nut, and a clamping spring is arranged on the fixing groove. The first rack and the second rack are meshed with the gear, the first nut and the second nut abut against each other through the gear, the locking force between the double nuts is greatly enhanced, a workpiece is firmly abutted against the double nuts, and looseness is prevented. A fixing groove is formed in the end, away from the first nut, of the second nut, a clamping spring is arranged on the fixing groove, the second nut is fastened through the clamping spring, and the anti-loosening effect is further improved.

Description

Technical Field

[0001] The present invention belongs to the technical field of fasteners, and particularly relates to a gear-type anti-loosening screw and nut. Background Art

[0002] Threaded connection is the most commonly used connection method at present. One of the advantages of threaded connection compared with other connections is that it is detachable and easy to repair. However, this is also its weakness. Especially in large mechanical equipment such as trains, automobiles, airplanes, and tanks with high-speed operation and strong vibration, malignant events such as rollovers and plane crashes and deaths caused by the loosening, detachment, and fatigue fracture of threaded connections are countless. With the development of machinery towards high speed and precision, the development of industrial scale towards large scale and automation, and the development of aerospace technology, etc., the problem of anti-loosening of threaded fastener connections has become increasingly prominent. Generally, the anti-vibration loosening life of fasteners is much lower than the fatigue life of other materials and structures, that is, the fasteners have already experienced loosening failure long before fatigue fracture. Therefore, continuously thinking about the anti-loosening problem of threaded connections has always been a research topic that people are committed to.

[0003] At present, there are many forms of anti-loosening of bolt connections. One of the more common ones is to use a double nut instead of a single nut connection. However, this form cannot completely ensure the anti-loosening effect. When alternating loads or external disturbance factors such as equipment vibration cause alternating strain of the connecting plate, it often fails to achieve the anti-loosening effect. After a period of time, it is often necessary to re-check and tighten, which affects the connection reliability to a certain extent. Summary of the Invention

[0004] The purpose of the present invention is to provide a gear-type anti-loosening screw and nut to solve the problem that the anti-loosening structure of traditional double-nut bolts loosens due to alternating loads or external disturbance factors such as vibration and causes alternating strain.

[0005] In order to achieve the above purpose, the present invention adopts the following technical solutions:

[0006] A gear-type anti-loosening screw and nut includes a screw, a first nut, and a second nut. A gasket is sleeved on one end of the first nut close to the second nut, and a first rack is arranged along the circumferential side of the upper end surface of the gasket; a fixed sleeve is sleeved on the outer peripheral side of the second nut, and a second rack is arranged along the circumferential side of the lower end surface of the fixed sleeve; a plurality of gears are arranged between the first rack and the second rack, and the first rack, the second rack, and the gears are meshed with each other; a fixed groove is arranged at one end of the second nut away from the first nut, and a circlip is arranged on the fixed groove.

[0007] Optionally, the first nut is a hexagonal nut.

[0008] Optionally, a first annular groove and a hexagonal groove are respectively arranged on the upper and lower end faces of the gasket. The first rack is arranged in the first annular groove, and the hexagonal groove is sleeved on the first nut.

[0009] Optionally, the second nut includes a threaded cylinder. A first boss is arranged on the upper end face of the threaded cylinder. The outer diameter of the first boss is larger than that of the threaded cylinder. A hexagonal sleeve is fixedly connected to the outer wall of the threaded cylinder. The fixing groove is located between the first boss and the hexagonal sleeve, and the lower end face of the threaded cylinder extends below the hexagonal sleeve.

[0010] Optionally, the fixing sleeve is sleeved on the outer wall of the hexagonal sleeve. The upper end face of the fixing sleeve is flush with the upper end face of the hexagonal sleeve. The lower end face of the fixing sleeve extends below the lower end face of the hexagonal sleeve. A second annular groove that is recessed toward the second nut is formed between the threaded cylinder, the hexagonal sleeve, and the fixing sleeve.

[0011] Optionally, the sum of the widths of the second annular groove and the second rack is equal to the width of the first rack.

[0012] Optionally, the width of the snap ring is larger than the thickness of the threaded cylinder.

[0013] Optionally, the gear is a bevel gear.

[0014] Optionally, a second boss is arranged on the circumferential side of the outer wall of the end of the first nut away from the second nut.

[0015] Beneficial effects: The gear-type anti-loosening screw and nut of the present invention are provided with a first rack, a second rack, and a gear. The first rack, the second rack, and the gear are meshed with each other. The first nut and the second nut are tightened against each other through the gear, greatly enhancing the locking force between the double nuts, and the workpiece can be firmly tightened to prevent loosening. A fixing groove is arranged at one end of the second nut away from the first nut, and a snap ring is arranged on the fixing groove. The second nut is fastened through the snap ring, further improving the anti-loosening effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 is an overall structural schematic diagram of a gear-type anti-loosening screw and nut of the present invention;

[0017] Figure 2 is a vertical sectional view of a gear-type anti-loosening screw and nut of the present invention;

[0018] Figure 3 is an overall structural schematic diagram of the first nut of the present invention;

[0019] Figure 4 is an overall structural schematic diagram of the gasket of the present invention;

[0020] Figure 5Schematic diagram of the overall structure of the second nut of the present invention;

[0021] Figure 6 Schematic diagram of the overall structure of the fixed sleeve of the present invention;

[0022] Figure 7 Schematic diagram of the overall structure of the gear of the present invention;

[0023] Figure 8 Schematic diagram of the overall structure of the snap ring of the present invention.

[0024] In the figure: 1, screw rod; 2, first nut; 3, second nut; 31, threaded cylinder; 32, first boss; 33, hexagonal sleeve; 4, gasket; 5, first rack; 6, fixed sleeve; 7, second rack; 8, gear; 9, fixed groove; 10, snap ring; 11, first annular groove; 12, hexagonal groove; 13, second annular groove; 14, second boss. Detailed implementation manners

[0025] In order to more clearly illustrate the technical solutions in the new embodiments of the present invention or the prior art, the following will briefly introduce the present invention in combination with the descriptions of the drawings and embodiments or the prior art. Obviously, the following descriptions of the structures of the drawings are only some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts. It should be noted here that the descriptions of these embodiments are used to help understand the present invention, but do not constitute a limitation to the present invention.

[0026] In the description of the present invention, it should be understood that the orientation or positional relationships indicated by orientation words such as "front, back, up, down, left, right", "horizontal, vertical, perpendicular, horizontal" and "top, bottom" are usually based on the orientation or positional relationships shown in the drawings. They are only for the convenience of describing the present invention and simplifying the description. Without contrary statements, these orientation words do not indicate and imply that the devices or elements referred to must have a specific orientation or be constructed and operated in a specific orientation, so they cannot be understood as limiting the protection scope of the present invention; the orientation words "inside, outside" refer to the inside and outside relative to the contours of the respective components.

[0027] In the description of the present invention, it should be understood that the use of words such as "first", "second" to limit components is only for the convenience of distinguishing the corresponding components. Without otherwise stating, these words have no special meanings, so they cannot be understood as limiting the protection scope of the present invention.

[0028] Embodiment 1

[0029] As Figures 1 - 8As shown in the figure, this embodiment provides a gear-type anti-loosening screw and nut, including a screw 1, a first nut 2 and a second nut 3. A gasket 4 is sleeved on one end of the first nut 2 close to the second nut 3, and a first rack 5 is arranged along the circumferential side of the upper end surface of the gasket 4; a fixed sleeve 6 is sleeved on the outer circumferential side of the second nut 3, and a second rack 7 is arranged along the circumferential side of the lower end surface of the fixed sleeve 6; a plurality of gears 8 are arranged between the first rack 5 and the second rack 7, and the first rack 5, the second rack 7 and the gears 8 are meshed with each other; a fixed groove 9 is arranged at one end of the second nut 3 away from the first nut 2, and a circlip 10 is arranged on the fixed groove 9.

[0030] Among them, in this embodiment, there are 8 gears, which are evenly arranged between the first rack 5 and the second rack 7; the racks on the first rack 5, the second rack 7 and the gears 8 are all straight teeth, and the first rack 5, the second rack 7 and the gears 8 are engaged with each other. The gasket 4 is fixedly sleeved on one end of the first nut 2 close to the second nut 3. When the first nut 2 rotates, the relative position between the gasket 4 and the first nut 2 remains unchanged; similarly, the fixed sleeve 6 is also fixedly sleeved on the outer circumferential side of the second nut 3. When the second nut 3 rotates, the relative position between the fixed sleeve 6 and the second nut 3 remains unchanged; the main functions of the gasket 4 and the fixed sleeve 6 are to provide more space for the arrangement of the first rack 5 and the second rack 7 respectively, so that the engagement between the gears 8 and the first rack 5 and the second rack 7 is closer; at the same time, to prevent the gears 8 from contacting the screw 1 and affecting the transmission effect between the first nut 2 and the second nut 3.

[0031] In this embodiment, the first rack 5 and the second rack 7 are respectively arranged on the gasket 4 and the fixed sleeve 6, rather than directly on the end face of the nut. This is mainly because the end face of the nut is generally narrow, the width of the rack is narrow, and it does not meet the engagement requirements. And directly arranging it on the nut will affect the strength of the nut; in addition, in order to adapt to the width of the rack, widening the end face of the nut will increase the cost and cause unnecessary waste of resources.

[0032] In practical applications, first pass the screw 1 through the workpiece, then tighten the first nut 2 so that the first nut 2 completely presses against the workpiece, then sleeve the gasket 4 on the end of the first nut 2 away from the workpiece, place the gear 8 above the gasket 4, and then tighten the second nut 3. Sleeve the fixed sleeve 6 on the outer circumferential side of the second nut 3 so that the second rack 7 on the fixed sleeve 6 is engaged with the gear 8, and finally install the circlip 10 in the fixed groove 9.

[0033] The gear-type anti-loosening screw nut of the present invention tightly presses the first nut 2 and the second nut 3 through the gear 8, greatly enhancing the locking force between the double nuts, and can firmly press the workpiece to prevent loosening; a fixing groove 9 is provided at one end of the second nut 3 away from the first nut 2, and a snap ring 10 is provided on the fixing groove 9 to fasten the second nut 3, further improving the anti-loosening effect.

[0034] Embodiment 2

[0035] As Figures 1 - 8 shown, this embodiment provides a gear-type anti-loosening screw nut, including a screw 1, a first nut 2 and a second nut 3. A gasket 4 is sleeved on one end of the first nut 2 close to the second nut 3, and a first rack 5 is arranged along the circumferential side of the upper end surface of the gasket 4; a fixed sleeve 6 is sleeved on the outer circumferential side of the second nut 3, and a second rack 7 is arranged along the circumferential side of the lower end surface of the fixed sleeve 6; a plurality of gears 8 are arranged between the first rack 5 and the second rack 7, and the first rack 5, the second rack 7 and the gears 8 are meshed with each other; a fixing groove 9 is provided at one end of the second nut 3 away from the first nut 2, and a snap ring 10 is provided on the fixing groove 9.

[0036] Among them, in this embodiment, there are 8 gears, which are evenly arranged between the first rack 5 and the second rack 7; the racks on the first rack 5, the second rack 7 and the gears 8 are all straight teeth, and the first rack 5 and the second rack 7 are engaged with the gears 8. The gasket 4 is fixedly sleeved on one end of the first nut 2 close to the second nut 3. When the first nut 2 rotates, the relative position between the gasket 4 and the first nut 2 remains unchanged; similarly, the fixed sleeve 6 is also fixedly sleeved on the outer circumferential side of the second nut 3. When the second nut 3 rotates, the relative position between the fixed sleeve 6 and the second nut 3 remains unchanged; the main functions of the gasket 4 and the fixed sleeve 6 are to provide a larger space for the arrangement of the first rack 5 and the second rack 7 respectively, so that the meshing between the gears 8 and the first rack 5 and the second rack 7 is tighter; at the same time, to prevent the gears 8 from contacting the screw 1 and affecting the transmission effect between the first nut 2 and the second nut 3.

[0037] In this embodiment, the first rack 5 and the second rack 7 are respectively formed on the gasket 4 and the fixed sleeve 6, rather than directly on the end face of the nut. This is mainly considered that the end face of the nut is generally narrow, the width of the rack is narrow, and it does not meet the meshing requirements. And directly forming on the nut will affect the strength of the nut; in addition, in order to adapt to the width of the rack, widening the end face of the nut will increase the cost and cause unnecessary waste of resources.

[0038] Preferably, the first nut 2 and the second nut 3 are both hexagonal nuts; first annular grooves 11 and hexagonal grooves 12 are respectively arranged on the upper and lower end faces of the gasket 4, the first rack 5 is arranged in the first annular groove 11, and the hexagonal groove 12 is sleeved on the first nut 2; the fixed sleeve 6 is in a hollow state, and a hexagonal prism groove is arranged therein to ensure that the relative positions of the gasket 4 sleeved on the first nut 2 and the fixed sleeve 6 sleeved on the second nut 3 do not change.

[0039] Embodiment 3,

[0040] As Figures 1 - 8 shown, this embodiment provides a gear-type anti-loosening screw and nut, including a screw 1, a first nut 2 and a second nut 3. A gasket 4 is sleeved on one end of the first nut 2 close to the second nut 3, and a first rack 5 is arranged along the circumferential side of the upper end face of the gasket 4; a fixed sleeve 6 is sleeved on the outer circumferential side of the second nut 3, and a second rack 7 is arranged along the circumferential side of the lower end face of the fixed sleeve 6; a plurality of gears 8 are arranged between the first rack 5 and the second rack 7, and the first rack 5, the second rack 7 and the gears 8 are meshed with each other; a fixing groove 9 is arranged at one end of the second nut 3 away from the first nut 2, and a snap ring 10 is arranged on the fixing groove 9.

[0041] Among them, in this embodiment, there are 8 gears, which are evenly arranged between the first rack 5 and the second rack 7; the racks on the first rack 5, the second rack 7 and the gears 8 are all straight teeth, and the first rack 5 and the second rack 7 are engaged with the gears 8. The gasket 4 is fixedly sleeved on one end of the first nut 2 close to the second nut 3. When the first nut 2 rotates, the relative position between the gasket 4 and the first nut 2 remains unchanged; similarly, the fixed sleeve 6 is also fixedly sleeved on the outer circumferential side of the second nut 3. When the second nut 3 rotates, the relative position between the fixed sleeve 6 and the second nut 3 remains unchanged; the main functions of the gasket 4 and the fixed sleeve 6 are to provide a larger space for arranging the first rack 5 and the second rack 7 respectively, so that the meshing between the gears 8 and the first rack 5 and the second rack 7 is tighter; at the same time, to prevent the gears 8 from contacting the screw 1 and affecting the transmission effect between the first nut 2 and the second nut 3.

[0042] In this embodiment, the first rack 5 and the second rack 7 are respectively arranged on the gasket 4 and the fixed sleeve 6, rather than directly on the end face of the nut, mainly considering that the end face of the nut is generally narrow, the width of the rack is narrow, and the meshing requirement cannot be met. Moreover, directly arranging on the nut will affect the strength of the nut; in addition, in order to adapt to the width of the rack, widening the end face of the nut will increase the cost and cause unnecessary waste of resources.

[0043] Preferably, the first nut 2 and the second nut 3 are both hexagonal nuts; first annular grooves 11 and hexagonal grooves 12 are respectively arranged on the upper and lower end faces of the gasket 4, the first rack 5 is arranged in the first annular groove 11, and the hexagonal groove 12 is sleeved on the first nut 2; the fixed sleeve 6 is in a hollow state, and a hexagonal prism groove is arranged therein to ensure that the relative positions of the gasket 4 sleeved on the first nut 2 and the fixed sleeve 6 sleeved on the second nut 3 do not change.

[0044] Specifically, referring to Figure 5 , the second nut 3 includes a threaded barrel 31, a first boss 32 is arranged on the upper end face of the threaded barrel 31, the outer diameter of the first boss 32 is larger than the outer diameter of the threaded barrel 31, a hexagonal sleeve 33 is fixedly connected to the outer wall of the threaded barrel 31, the fixed groove 9 is located between the first boss 32 and the hexagonal sleeve 33, and the lower end face of the threaded barrel 31 extends below the hexagonal sleeve 33.

[0045] Among them, in this embodiment, the threaded barrel 31, the first boss 32 and the hexagonal sleeve 33 are integrally arranged. The first boss 32 is a table surface widened along the circumferential side of one end of the threaded barrel 31, and its main purpose is to limit the snap ring 10 to prevent the snap ring 10 from falling off; the outer cross-section of the hexagonal sleeve 33 is hexagonal and the inner cross-section is circular. The lower end face of the threaded barrel 31 extends below the hexagonal sleeve 33. When the second nut 3 is tightened, the lower end face of the threaded barrel 31 abuts against the upper end face of the gasket 4, leaving a gap between the hexagonal sleeve 33 and the gasket 4, which is convenient for installing the gear 8.

[0046] Further, referring to Figure 2 , the fixed sleeve 6 is sleeved on the outer wall of the hexagonal sleeve 33. The upper end face of the fixed sleeve 6 is flush with the upper end face of the hexagonal sleeve 33, and the lower end face of the fixed sleeve 6 extends below the lower end face of the hexagonal sleeve 33. A second annular groove 13 recessed toward the second nut 3 is formed between the threaded barrel 31, the hexagonal sleeve 33 and the fixed sleeve 6; due to the arrangement of the second annular groove 13, the width of the second rack 7 is smaller than the width of the first rack 5; where this width refers to the dimension in the radial direction of the screw 1.

[0047] Specifically, the sum of the width of the second annular groove 13 and the width of the second rack 7 is equal to the width of the first rack 5.

[0048] Embodiment 4

[0049] As Figures 1 - 8As shown in the figure, this embodiment provides a gear-type anti-loosening screw and nut, including a screw 1, a first nut 2, and a second nut 3. A gasket 4 is sleeved on one end of the first nut 2 close to the second nut 3, and a first rack 5 is arranged along the circumferential side of the upper end face of the gasket 4. A fixed sleeve 6 is sleeved on the outer circumferential side of the second nut 3, and a second rack 7 is arranged along the circumferential side of the lower end face of the fixed sleeve 6. A plurality of gears 8 are arranged between the first rack 5 and the second rack 7, and the first rack 5, the second rack 7, and the gears 8 are meshed with each other. A fixed groove 9 is arranged at one end of the second nut 3 away from the first nut 2, and a circlip 10 is arranged on the fixed groove 9.

[0050] Among them, in this embodiment, there are 8 gears, which are evenly arranged between the first rack 5 and the second rack 7. The racks on the first rack 5, the second rack 7, and the gears 8 are all straight teeth. The first rack 5 and the second rack 7 are meshed with the gears 8. The gasket 4 is fixedly sleeved on one end of the first nut 2 close to the second nut 3. When the first nut 2 rotates, the relative position between the gasket 4 and the first nut 2 remains unchanged. Similarly, the fixed sleeve 6 is also fixedly sleeved on the outer circumferential side of the second nut 3. When the second nut 3 rotates, the relative position between the fixed sleeve 6 and the second nut 3 remains unchanged. The main functions of the gasket 4 and the fixed sleeve 6 are to provide a larger space for arranging the first rack 5 and the second rack 7 respectively, so that the meshing between the gears 8 and the first rack 5 and the second rack 7 is tighter. At the same time, it prevents the gears 8 from contacting the screw 1 and affecting the transmission effect between the first nut 2 and the second nut 3.

[0051] In this embodiment, the first rack 5 and the second rack 7 are respectively arranged on the gasket 4 and the fixed sleeve 6, rather than directly on the end face of the nut. This is mainly considered that the end face of the nut is generally narrow, the width of the rack is narrow, and it cannot meet the meshing requirements. And directly arranging it on the nut will affect the strength of the nut. In addition, in order to adapt to the width of the rack, widening the end face of the nut will increase the cost and cause unnecessary waste of resources.

[0052] Preferably, both the first nut 2 and the second nut 3 are hexagonal nuts. First annular grooves 11 and hexagonal grooves 12 are respectively arranged on the upper and lower end faces of the gasket 4. The first rack 5 is arranged in the first annular groove 11, and the hexagonal groove 12 is sleeved on the first nut 2. The fixed sleeve 6 is in a hollow state, and a hexagonal prism groove is arranged inside it to ensure that the relative position does not change after the gasket 4 is sleeved on the first nut 2 and the fixed sleeve 6 is sleeved on the second nut 3.

[0053] Specifically, the second nut 3 includes a threaded cylinder 31. An upper end surface of the threaded cylinder 31 is provided with a first boss 32. An outer diameter of the first boss 32 is larger than an outer diameter of the threaded cylinder 31. A hexagonal sleeve 33 is fixedly connected to an outer wall of the threaded cylinder 31. The fixing groove 9 is located between the first boss 32 and the hexagonal sleeve 33. A lower end surface of the threaded cylinder 31 extends below the hexagonal sleeve 33.

[0054] Wherein, in this embodiment, the threaded cylinder 31, the first boss 32 and the hexagonal sleeve 33 are integrally provided. The first boss 32 is a table surface widened along a circumferential side of one end of the threaded cylinder 31. Its main purpose of setting is to limit the snap ring 10 and prevent the snap ring 10 from falling off. An outer cross-section of the hexagonal sleeve 33 is hexagonal and an inner cross-section is circular. The lower end surface of the threaded cylinder 31 extends below the hexagonal sleeve 33. When the second nut 3 is tightened, the lower end surface of the threaded cylinder 31 abuts against an upper end surface of the gasket 4, leaving a gap between the hexagonal sleeve 33 and the gasket 4, which is convenient for installing the gear 8.

[0055] Further, referring to Figure 2 , the fixing sleeve 6 is sleeved on an outer wall of the hexagonal sleeve 33. An upper end surface of the fixing sleeve 6 is flush with an upper end surface of the hexagonal sleeve 33. A lower end surface of the fixing sleeve 6 extends below a lower end surface of the hexagonal sleeve 33. A second annular groove 13 recessed toward the second nut 3 is formed between the threaded cylinder 31, the hexagonal sleeve 33 and the fixing sleeve 6. Due to the setting of the second annular groove 13, a width of the second rack 7 is smaller than a width of the first rack 5. Wherein this width refers to a dimension along a radial direction of the screw rod 1.

[0056] Specifically, a sum of the width of the second annular groove 13 and the width of the second rack 7 is equal to the width of the first rack 5.

[0057] In one implementation, referring to Figure 2 , a width of the snap ring 10 is larger than a thickness of the threaded cylinder 31. After the snap ring 10 is installed, it is located above the fixing sleeve 6 and can also play a role in limiting the fixing sleeve 6.

[0058] In one implementation, referring to Figure 2 and Figure 7 , the gear 8 is a bevel gear 8. Correspondingly, the first rack 5 and the second rack 7 are also inclined from outside to inside. The transmission effect of the bevel gear 8 is better than that of the cylindrical gear 8.

[0059] In one implementation, referring to Figure 3, a second boss 14 is provided on the circumferential side of the outer wall of the end of the first nut 2 away from the second nut 3; specifically, the second boss 14 is a widened table surface along the radial direction of the first nut 2. By providing the second boss 14, the contact area between the first nut 2 and the workpiece is increased, and the anti-loosening effect is improved.

[0060] Finally, it should be noted that the above are only the preferred embodiments of the present invention and are not intended to limit the protection scope of the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A gear-type anti-loosening screw nut, comprising a screw (1), a first nut (2) and a second nut (3), characterized in that: A gasket (4) is sleeved on one end of the first nut (2) close to the second nut (3), and a first rack (5) is arranged along the circumference of the upper end surface of the gasket (4); a fixing sleeve (6) is sleeved on the outer circumference of the second nut (3), and a second rack (7) is arranged along the circumference of the lower end surface of the fixing sleeve (6); a plurality of gears (8) are arranged between the first rack (5) and the second rack (7), and the first rack (5), the second rack (7) and the gears (8) are meshed with each other; a fixing groove (9) is arranged on one end of the second nut (3) away from the first nut (2), and a retaining spring (10) is arranged on the fixing groove (9).

2. A gear type anti-loosening screw nut according to claim 1, characterized in that: The first nut (2) is a hexagonal nut.

3. A gear type anti-loosening screw nut according to claim 2, characterized in that: The gasket (4) is provided with a first annular groove (11) and a hexagonal groove (12) on its upper and lower end surfaces respectively; the first rack (5) is arranged in the first annular groove (11); and the hexagonal groove (12) is sleeved on the first nut (2).

4. The gear type anti-loosening screw nut according to claim 1, characterized in that: The second nut (3) comprises a threaded barrel (31), the upper end surface of the threaded barrel (31) is provided with a first boss (32), the outer diameter of the first boss (32) is larger than the outer diameter of the threaded barrel (31), a hexagonal sleeve (33) is fixedly connected to the outer wall of the threaded barrel (31), the fixing groove (9) is located between the first boss (32) and the hexagonal sleeve (33), and the lower end surface of the threaded barrel (31) extends below the hexagonal sleeve (33).

5. The gear type anti-loosening screw nut according to claim 4, characterized in that: The fixed sleeve (6) is sleeved on the outer wall of the hexagonal sleeve (33), the upper end surface of the fixed sleeve (6) is flush with the upper end surface of the hexagonal sleeve (33), the lower end surface of the fixed sleeve (6) extends below the lower end surface of the hexagonal sleeve (33), and a second annular groove (13) recessed toward one side of the second nut (3) is formed between the threaded barrel (31), the hexagonal sleeve (33) and the fixed sleeve (6).

6. The gear type anti-loosening screw nut according to claim 5, characterized in that: The sum of the widths of the second annular groove (13) and the second rack (7) is equal to the width of the first rack (5).

7. The gear type anti-loosening screw nut according to claim 4, characterized in that: The width of the clamping ring (10) is greater than the thickness of the threaded barrel (31).

8. The gear type anti-loosening screw nut according to claim 1, characterized in that: The gear (8) is a bevel gear.

9. The gear type anti-loosening screw nut according to claim 1, characterized in that: A second boss (14) is provided on the outer wall circumference side of the first nut (2) away from one end of the second nut (3).

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