阅读说明：本技术 一种对称开槽防松螺母结构及螺母防松方法 (Symmetrical slotting locknut structure and locknut locking method ) 是由 张祝新 李伟建 赵丁选 孙朋朋 田旭 夏佳琪 马帅 刘谦 于 2021-07-27 设计创作，主要内容包括：本发明公开了一种对称开槽防松螺母结构及螺母防松方法,螺母结构包括对称开槽螺母和夹紧螺钉,所述对称开槽螺母在柱面沿径向开有锁紧槽A和锁紧槽B,所述锁紧槽A和锁紧槽B将对称开槽螺母分割成螺母本体A和螺母本体B,螺母本体A开有工艺光孔A和工艺光孔B,螺母本体B开有螺纹孔A和螺纹孔B,所述螺母结构位于缸筒内部的螺杆上,螺杆前端设置有光杆段和螺纹段,缸筒与光杆段之间设置有轴承A和轴承B,螺纹段紧挨轴承B的位置设置有该螺母结构,本发明结构简单、操作方便、对称开槽螺母可重复使用,轴承游隙发生变化时可重新调整,采用夹紧螺钉紧固的方式保证了螺母的防松,满足了在特殊窄小工况下对轴承调隙并防止螺母松脱的要求。(The invention discloses a symmetrical slotted locknut structure and a locknut locking method, wherein the nut structure comprises a symmetrical slotted nut and a clamping screw, the symmetrical slotted nut is provided with a locking groove A and a locking groove B along the radial direction of a cylindrical surface, the locking groove A and the locking groove B divide the symmetrical slotted nut into a nut body A and a nut body B, the nut body A is provided with a process unthreaded hole A and a process unthreaded hole B, the nut body B is provided with a threaded hole A and a threaded hole B, the nut structure is positioned on a screw rod in a cylinder barrel, the front end of the screw rod is provided with a polished rod section and a threaded section, a bearing A and a bearing B are arranged between the cylinder barrel and the polished rod section, and the threaded section is arranged close to the bearing B, the requirements of adjusting the clearance of the bearing and preventing the nut from loosening under special narrow working conditions are met.)

1. The utility model provides a symmetry fluting locknut structure which characterized in that: the nut comprises a symmetrical slotted nut (5) and a clamping screw (7), wherein the cylindrical surface of the symmetrical slotted nut (5) is circular, a locking groove A (6) and a locking groove B (9) are radially formed in the cylindrical surface of the symmetrical slotted nut (5), the locking groove A (6) and the locking groove B (9) divide the symmetrical slotted nut (5) into a nut body A (8) and a nut body B (10), the locking groove A (6) and the locking groove B (9) are symmetrical about the axial line position of the symmetrical slotted nut (5), the nut body A (8) is provided with a process unthreaded hole A (12) and a process unthreaded hole B (15), the nut body B (10) is provided with a threaded hole A (13) and a threaded hole B (14), the axial line position of the process unthreaded hole A (12) is coincident with the axial line position of the threaded hole A (13), the axial line position of the process unthreaded hole B (15) is coincident with the axial line position of the threaded hole B (14), and the threaded hole A (13) and the threaded hole B (14) are symmetrical about the axis position of the symmetrical slotted nut (5), the axis position of the threaded hole A (13) and the axis position of the threaded hole B (14) are parallel to the axis position of the symmetrical slotted nut (5), the hole depths of the technical unthreaded hole A (12) and the technical unthreaded hole B (15) are the thickness of the nut body A (8), the hole depths of the threaded hole A (13) and the threaded hole B (14) are the thickness of the nut body B (10), and the clamping screw (7) is screwed into the threaded hole A (13) and the threaded hole B (14) respectively through the technical unthreaded hole A (12) and the technical unthreaded hole B (15).

2. The symmetrical slotted locknut structure of claim 1, wherein: the symmetrical slotted nut (5) is arranged on a screw rod (1) located on the inner central axis of a cylinder barrel (11), a polished rod section (3-1) and a threaded section (3-2) are arranged at the front end of the screw rod (1), a bearing A (2) and a bearing B (4) are arranged between the cylinder barrel (11) and the polished rod section (3-1), the bearing A (2) and the bearing B (4) adopt a radial thrust bearing or a tapered roller bearing, the bearing A (2) and the bearing B (4) are installed in a face-to-face or back-to-back mode, and the symmetrical slotted nut (5) is installed on the threaded section (3-2) close to the bearing B (4).

3. The symmetrical slotted locknut structure of claim 1, wherein: and the bottom surfaces of the locking groove A (6) and the locking groove B (9) are respectively subjected to arc treatment with the left end surface of the nut body A (8) and the right end surface of the nut body B (10).

4. A symmetrical slotting as claimed in claim 1Locknut structure, its characterized in that: the maximum depth of the locking groove A (6) is h₁The maximum depth of the locking groove B (9) is h₂The radius of the excircle of the symmetrical slotted nut (5) is R, the radius of the threaded hole of the symmetrical slotted nut (5) is R, and R-R is less than h₁=h₂＜R。

5. The symmetrical slotted locknut structure of claim 1, wherein: the thickness of the nut body A (8) is smaller than that of the nut body B (10).

6. The symmetrical slotted locknut structure of claim 1, wherein: the plane formed by the axis of the process unthreaded hole A (12) and the axis of the process unthreaded hole B (15) is a symmetrical plane of the locking groove A (6) or the locking groove B (9).

7. The symmetrical slotted locknut structure of claim 2, wherein: the thread of the thread section (3-2) and the thread of the symmetrical slotted nut (5) are both fine threads.

8. The anti-loosening method of the symmetrical slotted anti-loosening nut is characterized in that: the method comprises the following steps:

s1, screwing the symmetrical slotted nut (5) through the technical unthreaded hole A (12) and the technical unthreaded hole B (15) by using a special tool (16) until the screw (1) is difficult to rotate, wherein no gap exists between the bearing A (2) and the bearing B (4), and the screw (1) is rotated while the symmetrical slotted nut (5) is screwed so as to enable the rolling bodies in the bearing A (2) and the bearing B (4) to be in correct installation positions on the raceway;

s2, loosening the symmetrical slotted nut (5) by using a special tool (16) through the technical unthreaded hole A (12) and the technical unthreaded hole B (15) until the screw rod (1) freely rotates, and realizing the looseness prevention of the nut by adopting a mode that the clamping screw (7) respectively fastens and applies force to the threaded hole A (13) and the threaded hole B (14);

s3, when internal play of the bearing A (2) and the bearing B (4) changes and needs to be adjusted, the clamping screw (7) is adjusted to reduce extrusion force of threads of the symmetrical slotted nut (5) and threads of the threaded section (3-2), then the symmetrical slotted nut (5) is screwed by using the special tool (16) to perform secondary clearance adjustment on the bearing A (2) and the bearing B (4), and the clamping screw (7) is screwed again to perform secondary looseness prevention on the symmetrical slotted nut (5) after the clearance adjustment is completed.

9. The method of claim 8 for preventing loosening of a symmetrical slotted locknut, wherein: the special tool (16) comprises a technical unthreaded hole A column (19-1) and a technical unthreaded hole B column (19-2) which are respectively and correspondingly inserted into a technical unthreaded hole A (12) and a technical unthreaded hole B (15), the technical unthreaded hole A column (19-1) and the technical unthreaded hole B column (19-2) are both fixedly connected onto a fixing plate A (17), the axial position of the technical unthreaded hole A column (19-1) and the axial position of the technical unthreaded hole B column (19-2) are symmetrical about the axial position of the fixing plate A (17) and are parallel to the axial position of the fixing plate A (17), a plurality of connecting columns (20) which are parallel to each other are fixedly connected between the fixing plate A (17) and the fixing plate B (21), the center of the fixing plate A (17) is provided with a technical unthreaded hole C (18), the center of the other surface of the fixing plate B (21) is connected with a square column (22), the square column (22) is internally provided with a hexagon socket (23), and the four axial lines of the fixing plate A (17), the fixing plate B (21), the square column (22) and the hexagon socket (23) are overlapped.

Technical Field

The invention belongs to the technical field of connecting fasteners, and relates to a symmetrical slotted nut structure and a nut anti-loosening method, in particular to a symmetrical slotted nut structure and a nut anti-loosening method for adjusting a gap of a bearing in a narrow space.

Background

As one of the common mechanical parts, the nut is widely used in various mechanical devices. Under the action of static load, the thread connection of the common standard nut is safe and reliable, but when the common standard nut is in the environments of mechanical vibration, impact and the like, the friction force between the thread pairs is usually reduced or disappears, and the phenomenon of loosening and loosening of the thread connection is caused. The first type of anti-loosening method is friction anti-loosening, and the friction force capable of preventing relative rotation of a thread pair is generated by pressing the thread pair axially or axially and radially to realize the anti-loosening of the nut, for example, an elastic washer plus the nut, a double nut, a self-locking nut, a nylon insert locking nut and the like are adopted, but with the increase of the mechanical vibration times, the pretightening force is gradually reduced, the friction force preventing the relative rotation of the thread pair is reduced, so that the nut is loosened, and the threaded connection fails; the second type of anti-loosening method is mechanical anti-loosening, relative rotation of the thread pair is directly limited through a stopping piece, for example, a cotter pin, a series steel wire, a stopping washer and the like are adopted, but the anti-loosening method is complicated to disassemble; the third type of anti-loosening method is riveting and punching anti-loosening, and after the nut is screwed down, the methods such as punching, welding or bonding and the like are adopted to make the thread pair lose the motion characteristic, so that the nut forms non-detachable connection, but the anti-loosening methods damage the thread pair, so that the detachment is difficult, and the nut or the bolt cannot be reused; the fourth type of anti-loosening method is structural anti-loosening, namely a down-type thread anti-loosening method, the structure of a bolt thread is utilized to be matched with a left-handed nut and a right-handed nut for use, when the bolt thread is under vibration and impact working conditions, the loosening direction of a fastening nut on a working supporting surface is opposite to the loosening direction of a locking nut on a non-supporting surface, so that the purpose of loosening and restricting loosening is achieved. The fifth type of anti-loosening method is to periodically re-tighten and prevent loosening, periodically check the fastening condition of the threaded connection, and reapply tightening torque to the threaded connection with the tightening torque requirement, but the anti-loosening method greatly increases the workload of personnel.

Regarding the five types of locknuts, when the clearance adjustment is performed in a special narrow space by adopting a nut adjustment method for a radial thrust bearing or a tapered roller bearing which is installed in a face-to-face or back-to-back manner, the nut torque is difficult to realize, the bearing clearance is difficult to adjust, and the locknut is difficult to ensure.

Disclosure of Invention

The technical problem to be solved by the invention is to provide a symmetrical slotted nut structure and a nut anti-loosening method, the symmetrical slotted nut structure is simple in structure, convenient to operate and safe and reliable in performance, the anti-loosening nut can be reused, the bearing clearance can be readjusted when changed, the dynamic balance of the bearing and the nut is ensured, and the problems that the bearing clearance adjustment and the nut anti-loosening are difficult when a centripetal thrust bearing or a tapered roller bearing which is installed in a face-to-face or back-to-back mode is subjected to clearance adjustment in a special narrow space by adopting a nut adjustment method are solved.

In order to solve the technical problems, the technical scheme adopted by the invention is as follows: a symmetrical slotted locknut structure comprises a symmetrical slotted nut and a clamping screw, wherein the column surface of the symmetrical slotted nut is circular, a locking groove A and a locking groove B are radially arranged on the column surface of the symmetrical slotted nut, the locking groove A and the locking groove B divide the symmetrical slotted nut into a nut body A and a nut body B, the locking groove A and the locking groove B are symmetrical about the axial line position of the symmetrical slotted nut, the nut body A is provided with a process unthreaded hole A and a process unthreaded hole B, the nut body B is provided with a threaded hole A and a threaded hole B, the axial line position of the process unthreaded hole A is superposed with the axial line position of the threaded hole A, the axial line position of the process unthreaded hole B is superposed with the axial line position of the threaded hole B, the threaded hole A and the threaded hole B are symmetrical about the axial line position of the symmetrical slotted nut, and the axial line positions of the threaded hole A and the threaded hole B are parallel to the axial line position of the symmetrical slotted nut, the hole depth of the technical unthreaded hole A and the hole depth of the technical unthreaded hole B are the thickness of the nut body A, the hole depth of the threaded hole A and the hole depth of the threaded hole B are the thickness of the nut body B, and the clamping screw is screwed into the threaded hole A and the threaded hole B respectively through the technical unthreaded hole A and the technical unthreaded hole B.

The technical scheme of the invention is further improved as follows: the symmetrical slotted nuts are arranged on a screw rod located on the central axis in the cylinder barrel, a polished rod section and a threaded section are arranged at the front end of the screw rod, a bearing A and a bearing B are arranged between the cylinder barrel and the polished rod section, the bearing A and the bearing B adopt radial thrust bearings or tapered roller bearings, the bearing A and the bearing B are arranged in a face-to-face or back-to-back mode, and the symmetrical slotted nuts are arranged on the threaded section close to the bearing B.

The technical scheme of the invention is further improved as follows: and the bottom surfaces of the locking groove A and the locking groove B are respectively subjected to arc treatment with the left end surface of the nut body A and the right end surface of the nut body B.

The technical scheme of the invention is further improved as follows: the maximum depth of the locking groove A is h₁The maximum depth of the locking groove B is h₂The excircle radius of the symmetrical slotted nut is R, the radius of the threaded hole of the symmetrical slotted nut is R, and R-R is less than h₁=h₂＜R。

The technical scheme of the invention is further improved as follows: the thickness of the nut body A is smaller than that of the nut body B.

The technical scheme of the invention is further improved as follows: and the plane formed by the axis of the process unthreaded hole A and the axis of the process unthreaded hole B is a symmetrical plane of the locking groove A or the locking groove B.

The technical scheme of the invention is further improved as follows: the thread of the thread section and the thread of the symmetrical slotted nut are both fine threads.

A locking method of a symmetrical slotted locknut comprises the following steps:

s1, tightening the symmetrical slotted nuts through the technical unthreaded hole A and the technical unthreaded hole B by using a special tool until the screw is difficult to rotate, wherein no gap exists between the bearing A and the bearing B, and the screw is rotated while tightening the symmetrical slotted nuts so as to enable the rolling bodies in the bearing A and the bearing B to be positioned at correct mounting positions on the raceways;

s2, loosening the symmetrical slotted nut through the technical unthreaded hole A and the technical unthreaded hole B by using a special tool until the screw rod freely rotates, and realizing looseness prevention of the nut by adopting a mode that a clamping screw respectively fastens and applies force to the threaded hole A and the threaded hole B;

s3, when the internal play of the bearing A and the bearing B changes and needs to be adjusted, the clamping screw is adjusted to reduce the extrusion force of the threads of the symmetrical slotted nut and the threads of the threaded section, then the symmetrical slotted nut is screwed by using a special tool to perform secondary clearance adjustment on the bearing A and the bearing B, and the clamping screw is screwed again to perform secondary looseness prevention on the symmetrical slotted nut after the clearance adjustment is completed.

The technical scheme of the invention is further improved as follows: the special tool comprises a technical unthreaded hole A column and a technical unthreaded hole B column which are correspondingly inserted into a technical unthreaded hole A and a technical unthreaded hole B respectively, wherein the technical unthreaded hole A column and the technical unthreaded hole B column are fixedly connected to a fixing plate A, the axial position of the technical unthreaded hole A column and the axial position of the technical unthreaded hole B column are symmetrical about the axial position of the fixing plate A and are parallel to the axial position of the fixing plate A, a plurality of connecting columns which are parallel to each other are fixedly connected between the fixing plate A and the fixing plate B, a technical unthreaded hole C is formed in the center of the fixing plate A, a square column is connected to the central position of the other side of the fixing plate B, an inner hexagonal hole is formed in the square column, and the four axial positions of the fixing plate A, the fixing plate B, the square column and the inner hexagonal hole coincide.

Due to the adoption of the technical scheme, the invention has the technical progress that:

1. the symmetrical slotted nut has the advantages of simple structure, convenient operation, safe and reliable performance, repeated use of the locknut, readjustment when the bearing clearance changes, guarantee of the dynamic balance of the bearing and the nut, and solving of the problem of difficult bearing clearance adjustment and nut locking when a nut adjustment method is adopted for the radial thrust bearing or the tapered roller bearing which is installed in a face-to-face or back-to-back mode in a special narrow space;

2. aiming at a centripetal thrust bearing or a tapered roller bearing which is installed in a face-to-face or back-to-back mode, the gap of the bearing is adjusted by adopting a symmetrical slotted nut adjusting method, a special tool is utilized to screw the symmetrical slotted nut through a process unthreaded hole A and a process unthreaded hole B until a screw is difficult to rotate, then the symmetrical slotted nut is unscrewed through the process unthreaded hole A and the process unthreaded hole B until the screw freely rotates, the screw is rotated to drive the bearing to rotate in the process of screwing the symmetrical slotted nut, and the rolling bodies of the bearing A and the bearing B are ensured to be in correct installation positions on a raceway; the clamping screws are adopted to respectively fasten and stress the threaded holes A and B, so that the extrusion force between the threads of the nut body A and the nut body B and the threads of the threaded section is increased, the elastic-plastic deformation is generated between the threads of the symmetrical slotted nut and the threads of the threaded section, and the looseness prevention of the nut is ensured; when the internal clearance of the bearing A and the bearing B changes and needs to be adjusted, the clamping screw is adjusted to reduce the extrusion force between the threads of the symmetrical slotted nut and the threads of the threaded section, then the symmetrical slotted nut is screwed by using a special tool to perform secondary clearance adjustment on the bearing A and the bearing B, and the clamping screw is screwed again to perform secondary looseness prevention on the symmetrical slotted nut after the clearance adjustment is completed, so that the centripetal thrust bearing or the tapered roller bearing in a special narrow space is ensured to be in a good working condition.

Drawings

FIG. 1 is a schematic structural view of a symmetrical slotted nut of the present invention during clearance adjustment of a bearing;

FIG. 2 is a front view of a symmetrical slotted nut configuration of the present invention;

FIG. 3 is a right side view of the symmetrical slotted nut configuration of the present invention;

FIG. 4 is a left side view of a symmetrical slotted nut configuration of the present invention;

FIG. 5 is an isometric view of a special tool for the symmetrical slotted nut of the present invention;

fig. 6 is a right side view of the special tool for the symmetrical slotted nut of the present invention.

Wherein, 1, a screw; 2. a bearing A; 3-1, a polished rod section; 3-2, thread sections; 4. a bearing B; 5. symmetrical slotted nuts; 6. a locking groove A; 7. a clamping screw; 8. a nut body A; 9. a locking groove B; 10. a nut body B; 11. a cylinder barrel; 12. a process unthreaded hole A; 13. a threaded hole A; 14. a threaded hole B; 15. a process unthreaded hole B; 16. a special tool; 17. fixing a plate A; 18. a process unthreaded hole C; 19-1, a technical unthreaded hole A column; 19-2, a technical unthreaded hole B column; 20. connecting columns; 21. a fixing plate B; 22. a square column; 23. and (4) inner hexagonal holes.

Detailed Description

The present invention will be described in further detail with reference to the following examples:

in order to make the technical solutions and advantages of the present invention more apparent, exemplary embodiments of the present invention are described in further detail below with reference to the accompanying drawings. It is clear that the described embodiments are only a part of the embodiments of the invention, and not an exhaustive list of all embodiments. And the embodiments and features of the embodiments may be combined with each other without conflict.

As shown in fig. 1 to 6, a symmetrical slotted locknut structure includes a symmetrical slotted nut 5 and a clamping screw 7, the symmetrical slotted nut 5 is processed by a material with good elasticity after heat treatment, the cylindrical surface of the symmetrical slotted nut 5 is circular after processing, a locking groove a6 and a locking groove B9 are radially opened on the cylindrical surface of the symmetrical slotted nut 5, the locking groove a6 and the locking groove B9 divide the symmetrical slotted nut 5 into a nut body A8 and a nut body B10, the thickness of the nut body A8 is smaller than that of the nut body B10, so as to reduce the deformation of the clamping screw 7 on the left end face of the nut body B10 when the threaded hole a13 and the threaded hole B14 are tightened and stressed, and reduce the influence on gap adjustment of the bearing a2 and the bearing B4 due to the deformation of the left end face of the nut body B10. The maximum depth of the locking groove A6 is h₁The maximum depth of the locking groove B9 is h₂The radius of the excircle of the symmetrical slotted nut 5 is R, the radius of the threaded hole of the symmetrical slotted nut 5 is R, and R-R is less than h₁=h₂< R to secure the clamping screw 7 in the screw holes A13 and AWhen the stress is applied to the position of the threaded hole B14 through fastening, the locking groove A6 and the locking groove B9 are symmetrical about the deformation of the X axis and have enough deformation space, the bottom surfaces of the locking groove A6 and the locking groove B9 are respectively subjected to arc treatment with the left end surface of the nut body A8 and the right end surface of the nut body B10, so that stress concentration of the clamping screw 7 in the positions of the threaded hole A13 and the threaded hole B14 through fastening and stress application is reduced, and the safe and reliable performance of the symmetrical slotted nut 5 is guaranteed. The nut body A8 is provided with a craftwork unthreaded hole A12 and a craftwork unthreaded hole B15, the nut body B10 is provided with a threaded hole A13 and a threaded hole B14, the axial position of the craftwork unthreaded hole A12 coincides with the axial position of the threaded hole A13, the axial position of the craftwork unthreaded hole B15 coincides with the axial position of the threaded hole B14, the hole depths of the craftwork unthreaded hole A12 and the craftwork unthreaded hole B15 are the thickness of the nut body A, and the hole depths of the threaded hole A13 and the threaded hole B14 are the thickness of the nut body B10. The axial position of the threaded hole A13 and the axial position of the threaded hole B14 are parallel to the axial position of the symmetrical slotted nut 5 and are symmetrical relative to the axial position of the symmetrical slotted nut 5, and the plane formed by the axis of the technical unthreaded hole A and the axis of the technical unthreaded hole B is a symmetrical plane of the locking groove A or the locking groove B. The clamping screw 7 is screwed into the threaded hole A13 and the threaded hole B14 through the craft unthreaded hole A12 and the craft unthreaded hole B15 respectively.

The symmetrical slotted nut 5 is arranged on a screw rod 1 located on the central axis in a cylinder 11, a polished rod section 3-1 and a threaded section 3-2 are arranged at the front end of the screw rod 1, a bearing A2 and a bearing B4 are arranged between the cylinder 11 and the polished rod section 3-1, a radial thrust bearing or a tapered roller bearing is adopted by the bearing A2 and the bearing B4, the bearing A2 and the bearing B4 are installed in a face-to-face or back-to-back mode, the symmetrical slotted nut 5 is installed on the threaded section 3-2 close to the bearing B4, the axial position of one of the bearing rings in the bearing A2 or the bearing B4 determines the internal clearance of the bearing, and the clearance determines the configuration performance and the operation condition of the bearing.

When a nut adjustment method is adopted for bearing clearance adjustment, a special tool 16 needs to be adopted, the special tool 16 comprises a process unthreaded hole A column 19-1 and a process unthreaded hole B column 19-2 which are respectively and correspondingly inserted into a process unthreaded hole A12 and a process unthreaded hole B15, the process unthreaded hole A column 19-1 and the process unthreaded hole B column 19-2 are both fixedly connected onto a fixing plate A17, the axial position of the process unthreaded hole A column 19-1 and the axial position of the process unthreaded hole B column 19-2 are symmetrical about the axial position of the fixing plate A17 and are parallel to the axial position of the fixing plate A17, a plurality of connecting columns 20 which are parallel to each other are fixedly connected between a fixing plate A17 and a fixing plate B21, the process unthreaded hole C18 is arranged at the center of the fixing plate A17, a square column 22 is connected at the center of the other surface of the fixing plate B21, an inner hexagonal hole 23 is arranged in the square column 22, and the fixing plate A17, the process unthreaded hole B15 and the process unthreaded hole B15 are arranged on the fixing plate A3983, The four axial positions of the fixing plate B21, the square column 22 and the hexagon socket 23 coincide.

The special tool 16 screws the symmetrical slotted nut 5 through the technical unthreaded hole A12 and the technical unthreaded hole B15 until the screw 1 is difficult to rotate, at the moment, the bearing A2 and the bearing B4 have no clearance, the screw 1 is rotated while screwing the symmetrical slotted nut 5 so as to enable rolling bodies in the bearing A2 and the bearing B4 to be at a correct installation position on a raceway, then the symmetrical slotted nut 5 is unscrewed through the technical unthreaded hole A12 and the technical unthreaded hole B15 until the screw 1 freely rotates, at the moment, the extrusion force between the threads of the nut body A8 and the nut body B10 and the threads of the thread section 3-2 is increased by adopting a mode that a clamping screw 7 respectively fastens and applies force at the threaded hole A13 and the threaded hole B14, and the anti-loosening of the symmetrical slotted nut 5 is ensured by utilizing the elastoplastic deformation of the threads of the symmetrical slotted nut 5 and the threads of the thread section 3-2. When the internal play of the bearing A2 and the bearing B4 changes and needs to be adjusted, the clamping screw 7 is adjusted to reduce the extrusion force between the threads of the symmetrical slotted nut 5 and the threads of the thread section 3-2, then the symmetrical slotted nut 5 is screwed by using the special tool 16 to perform secondary gap adjustment on the bearing A2 and the bearing B4, and the clamping screw 7 is screwed again to perform secondary anti-loosening on the symmetrical slotted nut 5 after the gap adjustment is completed, so that the centripetal thrust bearing or the tapered roller bearing is ensured to be in a good condition in a special narrow space.

The invention provides a locking method of a symmetrical slotted locknut, in particular to a locknut structure and a locknut locking method which are suitable for adjusting a gap of a bearing in a narrow space, comprising the following steps:

s1, tightening the symmetrical slotted nuts 5 through the technical unthreaded hole A12 and the technical unthreaded hole B15 by using the special tool 16 until the screw 1 is difficult to rotate, wherein no gap exists between the bearing A2 and the bearing B4, and the screw 1 is rotated while the symmetrical slotted nuts 5 are tightened so as to enable rolling bodies in the bearing A2 and the bearing B4 to be in correct installation positions on the raceways;

s2, loosening the symmetrical slotted nut 5 by using the special tool 16 through the technical unthreaded hole A12 and the technical unthreaded hole B15 until the screw rod 1 freely rotates, and realizing the loosening prevention of the nut by adopting a mode that the clamping screw 7 respectively fastens and applies force to the threaded hole A13 and the threaded hole B14;

s3, when the internal play of the bearing A2 and the bearing B4 changes and needs to be adjusted, the clamping screw 7 is adjusted to reduce the extrusion force between the threads of the symmetrical slotted nut 5 and the threads of the thread section 3-2, then the symmetrical slotted nut 5 is screwed by the special tool 16 to perform secondary gap adjustment on the bearing A2 and the bearing B4, and the clamping screw 7 is screwed again to perform secondary anti-loosening on the symmetrical slotted nut 5 after the gap adjustment is completed.

When the symmetrical slotted nut 5 performs gap adjustment on the bearing A2 and the bearing B4, the deformation of the nut body B10 is symmetrical about the X axis, and the gap adjustment effect on the bearing A2 and the bearing B4 is small. The invention has simple structure, convenient maintenance and repair, can be readjusted when the bearing clearance changes, and has good practical value.

The above-described embodiment is only one of the specific embodiments of the present invention, and general changes and substitutions by those skilled in the art within the technical scope of the present invention should be included in the protection scope of the present invention. Therefore, it is intended that the invention not be limited to the particular embodiment disclosed, but that the invention will include all embodiments falling within the scope of the appended claims.