阅读说明：本技术 一种开槽螺母结构及采用螺钉顶压的螺母防松方法 (Slotted nut structure and nut anti-loosening method adopting screw jacking ) 是由 张祝新 李伟建 赵丁选 田旭 孙朋朋 夏佳琪 马帅 刘谦 于 2021-07-27 设计创作，主要内容包括：本发明公开了一种开槽螺母结构及采用螺钉顶压的螺母防松方法,螺母结构包括开槽螺母和顶压螺钉,所述开槽螺母在柱面沿径向开有锁紧槽,锁紧槽将开槽螺母分割成螺母本体A和螺母本体B,螺母本体A开有顶压螺钉的螺纹孔A、螺纹孔B和开有为开槽螺母调隙扭转的工艺光孔A、工艺光孔B,所述螺母结构设置在位于缸筒内部中心轴线的螺杆上,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、开槽螺母可重复使用,轴承游隙发生变化时可重新调整,采用顶压螺钉顶压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 slotted nut structure and a nut anti-loose method using screw top pressure, the nut structure comprises a slotted nut and a top pressure screw, the slotted nut is provided with a locking groove along the radial direction on the cylindrical surface, the locking groove divides the slotted nut into a nut body A and a nut body B, the nut body A is provided with a threaded hole A and a threaded hole B for the top pressure screw, and a process unthreaded hole A and a process unthreaded hole B for adjusting the gap and twisting of the slotted nut, the nut structure is arranged on a screw rod positioned on the central axis 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, the threaded section is arranged close to the bearing B, the nut structure is arranged, the structure is simple, the operation is convenient, the slotted nut can be repeatedly used, the re-adjustment can be carried out when the bearing clearance changes, the top pressure of the top pressure screw is adopted to ensure the anti-loose of the nut, the requirements of adjusting the clearance of the bearing and preventing the nut from loosening under special narrow working conditions are met.)

1. A slotted nut structure which is characterized in that: the technical unthreaded hole structure comprises a slotted nut (4) and a jacking screw (6), wherein the cylindrical surface of the slotted nut (4) is circular, a locking groove (5) is formed in the cylindrical surface of the slotted nut (4) along the radial direction, the locking groove (5) divides the slotted nut (4) into a nut body A (7) and a nut body B (8), the nut body A (7) is provided with a threaded hole A (11) and a threaded hole B (13) of the jacking screw (6), and a technical unthreaded hole A (12) and a technical unthreaded hole B (14) which are used for adjusting clearance and twisting of the slotted nut (4), the axial position of the technical unthreaded hole A (12) and the axial position of the technical unthreaded hole B (14) are symmetrical relative to the axial position of the slotted nut (4), the axial position of the technical unthreaded hole A (12) and the axial position of the technical unthreaded hole B (14) are parallel to the axial position of the slotted nut (4), and the hole depth of the technical unthreaded hole A (12) is equal to that of the technical unthreaded hole B (14), the thickness of the nut body A (7) is equal to that of the nut body A (7), the axial line position of the threaded hole A (11) and the axial line position of the threaded hole B (13) are symmetrical with respect to a plane formed by the axial line position of the technical unthreaded hole A (12) and the axial line position of the technical unthreaded hole B (14), the axial line positions of the threaded hole A (11) and the threaded hole B (13) are parallel to that of the slotted nut (4), and the hole depths of the threaded hole A (11) and the threaded hole B (13) are equal to that of the nut body A (7).

2. A slotted nut arrangement according to claim 1, wherein: the slotted nut (4) is arranged on a screw rod (1) located on the inner central axis of a cylinder barrel (9), a polished rod section (10-1) and a threaded section (10-2) are arranged at the front end of the screw rod (1), a bearing A (2) and a bearing B (3) are arranged between the cylinder barrel (9) and the polished rod section (10-1), the bearing A (2) and the bearing B (3) adopt a radial thrust bearing or a tapered roller bearing, the bearing A (2) and the bearing B (3) are arranged in a face-to-face or back-to-back mode, and the slotted nut (4) is arranged on the threaded section (10-2) close to the bearing B (3).

3. A slotted nut arrangement according to claim 1, wherein: and the bottom surface of the locking groove (5) is respectively subjected to circular arc treatment with the left end surface of the nut body A (7) and the right end surface of the nut body B (8).

4. A slotted nut arrangement according to claim 1, wherein: the thickness of the nut body A (7) is smaller than that of the nut body B (8).

5. A slotted nut arrangement according to claim 1, wherein: the maximum depth of the locking groove (5) is h, the excircle radius of the slotted nut (4) is R, the radius of the threaded hole of the slotted nut (4) is R, and R + R is less than h and less than 2R.

6. A slotted nut arrangement according to claim 1, wherein: and the plane formed by the axial position of the technical unthreaded hole A (12) and the axial position of the technical unthreaded hole B (14) is a symmetrical plane of the locking groove (5).

7. A slotted nut arrangement according to claim 1, wherein: on the right end face of the slotted nut (4), a connecting line of the circle center of the threaded hole A (11) or the threaded hole B (13) and the circle center of the slotted nut (4) and a connecting line of the circle center of the technical unthreaded hole A (12) and the circle center of the slotted nut (4) form an included angle beta, and the included angle beta is more than 0 degree and less than 90 degrees.

8. A slotted nut arrangement according to claim 2, wherein: the thread of the thread section (10-2) and the thread of the slotted nut (4) are both fine threads.

9. A nut anti-loosening method adopting screw jacking is characterized in that: the method comprises the following steps:

s1, screwing the slotted nut (4) through the technical unthreaded hole A (12) and the technical unthreaded hole B (14) on the nut body A (7) by using a special tool (15) until the screw (1) is difficult to rotate, and rotating the screw (1) in the process of screwing the slotted nut (4) so as to enable the rolling bodies in the bearing A (2) and the bearing B (3) to be in correct installation positions on the raceways;

s2, loosening the slotted nut (4) by using a special tool (15) through the technical unthreaded hole A (12) and the technical unthreaded hole B (14) on the nut body A (7) until the screw rod (1) freely rotates, and realizing the looseness prevention of the nut by adopting a mode that the jacking screw (6) respectively jacks and applies force at the threaded hole A (11) and the threaded hole B (13);

s3, when the internal play of the bearing A (2) and the bearing B (3) changes and needs to be adjusted, the jacking screw (6) is adjusted to reduce the extrusion force of the threads of the slotted nut (4) and the threads of the threaded section (10-2), then the slotted nut (4) is screwed by using a special tool (15) to perform secondary clearance adjustment on the bearing A (2) and the bearing B (3), and after the clearance adjustment is completed, the jacking screw (6) is adopted to respectively jack and screw the threaded hole A (11) and the threaded hole B (13) again.

10. The method for preventing loosening of the nut by jacking the screw as claimed in claim 9, wherein the method comprises the following steps: the special tool (15) comprises a technical unthreaded hole A column (18-1) and a technical unthreaded hole B column (18-2) which are respectively and correspondingly inserted into a technical unthreaded hole A (12) and a technical unthreaded hole B (14), the technical unthreaded hole A column (18-1) and the technical unthreaded hole B column (18-2) are both fixedly connected onto a fixing plate A (16), the axial position of the technical unthreaded hole A column (18-1) and the axial position of the technical unthreaded hole B column (18-2) are symmetrical about the axial position of the fixing plate A (16) and are parallel to the axial position of the fixing plate A (16), a plurality of connecting columns (19) which are parallel to each other are fixedly connected between the fixing plate A (16) and the fixing plate B (20), the center of the fixing plate A (16) is provided with a technical unthreaded hole C (17), the center of the other surface of the fixing plate B (20) is connected with a square column (21), the square column (21) is internally provided with a hexagon socket (22), and the four axial lines of the fixing plate A (16), the fixing plate B (20), the square column (21) and the hexagon socket (22) are overlapped.

Technical Field

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

Background

As a common mechanical connection fastener used with a bolt, a nut is widely used in various mechanical devices. When ordinary standard nut is connected with bolt under the static load effect, because screw thread lead angle is less than the equivalent friction angle of screw pair, self-locking can be realized on the structure atress to threaded connection, but under factor influences such as continuous mechanical oscillation, impact, can lead to the frictional force between the screw pair to reduce gradually or disappear usually, appear threaded connection and move back the pine phenomenon soon. 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.

However, for the five types of locknuts, when the clearance adjustment is performed in a special narrow space by adopting a nut adjustment method for the radial thrust bearing or the 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 nut is difficult to ensure the looseness prevention.

Disclosure of Invention

The invention provides a slotted nut structure and a nut anti-loose method using screw jacking, the slotted nut structure has simple structure and convenient operation, the anti-loose nut can be used repeatedly, the bearing clearance can be readjusted when changing, the dynamic balance of the bearing and the nut is ensured, and the problems of difficult bearing clearance adjustment and nut anti-loose when the radial thrust bearing or the tapered roller bearing which is arranged in a face-to-face or back-to-back way is adjusted by using a nut adjusting method in a special narrow space are solved.

In order to solve the technical problems, the technical scheme adopted by the invention is as follows: a grooved nut structure comprises a grooved nut and a jacking screw, wherein the cylindrical surface of the grooved nut is circular, a locking groove is radially formed in the cylindrical surface of the grooved nut, the locking groove divides the grooved nut into a nut body A and a nut body B, the nut body A is provided with a threaded hole A and a threaded hole B of the jacking screw, and a process unthreaded hole A and a process unthreaded hole B which are used for adjusting the gap and twisting of the grooved nut, the axial position of the process unthreaded hole A and the axial position of the process unthreaded hole B are symmetrical about the axial position of the grooved nut, the axial position of the process unthreaded hole A and the axial position of the process unthreaded hole B are parallel to the axial position of the grooved nut, the hole depth of the process unthreaded hole A is equal to the hole depth of the process unthreaded hole B and equal to the thickness of the nut body A, and the axial positions of the threaded hole A and the threaded hole B are symmetrical about the plane formed by the axial position of the process unthreaded hole A and the axial position of the process unthreaded hole B, and the axial line position of the threaded hole A and the axial line position of the threaded hole B are parallel to the axial line position of the slotted nut, and the hole depths of the threaded hole A and the threaded hole B are the thickness of the nut body A.

The technical scheme of the invention is further improved as follows: the slotted nut is 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 slotted nut is arranged on the threaded section close to the bearing B.

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

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: the maximum depth of the locking groove 5 is h, the excircle radius of the slotted nut is R, the radius of the threaded hole of the slotted nut is R, and R + R is less than h and less than 2R.

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

The technical scheme of the invention is further improved as follows: on the right end face of the slotted nut, a connecting line of the circle center of the threaded hole A or the threaded hole B and the circle center of the slotted nut and a connecting line of the circle center of the technical unthreaded hole A and the circle center of the slotted nut form a beta included angle, and beta is more than 0 degree and less than 90 degrees.

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

A nut anti-loosening method using a screw to press comprises the following steps:

s1, screwing the slotted nut through the technical unthreaded hole A and the technical unthreaded hole B on the nut body A by using a special tool until the screw is difficult to rotate, and rotating the screw in the process of screwing the slotted nut so as to enable the rolling bodies in the bearing A and the bearing B to be in correct mounting positions on the raceways;

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

s3, when the internal play of the bearing A and the bearing B changes and needs to be adjusted, adjusting the jacking screw to reduce the extrusion force of the thread of the slotted nut and the thread of the threaded section, then screwing the slotted nut by using a special tool to perform secondary gap adjustment on the bearing A and the bearing B, and after the gap adjustment is completed, adopting the jacking screw to respectively jack and screw the threaded hole A and the threaded hole B again.

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 anti-loosening nut has the advantages of simple structure, convenience in operation, safe and reliable performance, reusability, capability of readjustment when the bearing clearance is changed, guarantee of dynamic balance of the bearing and the nut, and solving of the problem that the bearing clearance adjustment and the nut loosening prevention are difficult 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. in order to solve the problem that the bearing clearance adjustment and nut locking are difficult by utilizing a nut adjustment method in a special narrow space, a slotted nut structure and a nut locking method adopting screw jacking are provided. When the nut adjustment method is adopted for bearing gap adjustment, the slotted nut is screwed up through the technical unthreaded hole A and the technical unthreaded hole B by using a special tool until the screw is difficult to rotate, the screw is rotated in the process of screwing up the slotted nut, the condition that the rolling bodies in the bearing A and the bearing B are positioned at correct installation positions on the roller paths is ensured, the slotted nut is unscrewed through the technical unthreaded hole A and the technical unthreaded hole B until the screw freely rotates, extrusion force is generated between the threads of the nut body A and the nut body B and the threads of the thread section by respectively jacking and stressing the threaded hole A and the threaded hole B through jacking screws, and the looseness prevention of the slotted nut is ensured by utilizing the elastic-plastic deformation between the threads of the slotted nut and the threads of the thread section. When the internal clearance of the bearing A and the bearing B changes and needs to be adjusted, the jacking screw is adjusted to reduce the extrusion force between the thread of the slotted nut and the thread of the threaded section, then a special tool is used for carrying out secondary clearance adjustment on the bearing A and the bearing B, the jacking screw is screwed down again after the clearance adjustment is finished to carry out secondary looseness prevention on the slotted nut, and the centripetal thrust bearing or the tapered roller bearing in a special narrow space is ensured to be in a good working condition. The nut body B in the slotted nut is not provided with a processing unthreaded hole and a threaded hole, so that the deformation of the nut body B after the slotted nut adjusts the clearance for the bearing is reduced, the stress deformation symmetry of the left end face of the nut body B is ensured, the stress of the bearing A and the bearing B is uniform, and the influence on the clearance of the bearing A and the bearing B is reduced.

Drawings

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

FIG. 2 is a front view of the inventive slotted nut configuration;

FIG. 3 is a right side view of the inventive slotted nut arrangement;

FIG. 4 is a left side view of the 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. a bearing B; 4. a slotted nut; 5. a locking groove; 6. jacking and pressing the screw; 7. a nut body A; 8. a nut body B; 9. a cylinder barrel; 10-1, a polish rod section; 10-2, a threaded section; 11. a threaded hole A; 12. a process unthreaded hole A; 13. a threaded hole B; 14. a process unthreaded hole B; 15. a special tool; 16. fixing a plate A; 17. a process unthreaded hole C; 18-1, a technical unthreaded hole A column; 18-2, a technical unthreaded hole B column; 19. connecting columns; 20. a fixing plate B; 21. a square column; 22. 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 slotted nut structure includes a slotted nut 4 and a top pressing screw 6, the slotted nut 4 is processed by a material with good elasticity after heat treatment, after the processing, a cylindrical surface of the slotted nut 4 is circular, a locking groove 5 is radially opened on the cylindrical surface of the slotted nut 4, the locking groove 5 divides the slotted nut 4 into a nut body a7 and a nut body B8, the thickness of the nut body a7 is smaller than that of the nut body B8, and the nut body B8 has no process unthreaded hole and threaded hole, so as to reduce the deformation of the slotted nut 4 on the left end surface of the nut body B8 after adjusting the gap between the bearing a2 and the bearing B3, ensure that the stressed deformation of the left end surface of the nut body B8 is symmetrical, and the stress of the bearing a2 and the bearing B3 is uniform, thereby reducing the influence on the play of the bearing a2 and the bearing B3. The maximum depth of the locking groove 5 is h, the excircle radius of the slotted nut 4 is R, the radius of the threaded hole of the slotted nut 4 is R, and R + R is more than h and less than 2R, so that when the jacking screw 6 jacks and applies force at the threaded hole A11 and the threaded hole B13 respectively, the locking groove 5 is symmetrical in deformation about the Y axis and has enough deformation space. The bottom surface of the locking groove 5 is respectively subjected to arc treatment with the left side end surface of the nut body A7 and the right side end surface of the nut body B8, so that stress concentration when the jacking screw 6 respectively jacks and applies force to the threaded hole A11 and the threaded hole B13 is reduced, and the safety and reliability of the performance of the slotted nut 4 are guaranteed. The axial position of the technical unthreaded hole A12 and the axial position of the technical unthreaded hole B14 are symmetrical about the axial position of the slotted nut 4, the axial position of the technical unthreaded hole A12 and the axial position of the technical unthreaded hole B14 are parallel to the axial position of the slotted nut 4, a plane formed by the axial position of the technical unthreaded hole A12 and the axial position of the technical unthreaded hole B14 is a symmetrical plane of the locking groove 5, and the hole depths of the technical unthreaded hole A12 and the technical unthreaded hole B14 are the thickness of the nut body A7. The nut body A7 is provided with a threaded hole A11 and a threaded hole B13, the axial position of the threaded hole A11 and the axial position of the threaded hole B13 are symmetrical about the plane formed by the axial position of a craft unthreaded hole A12 and the axial position of a craft unthreaded hole B14, the axial position of the threaded hole A11 and the axial position of the threaded hole B13 are parallel to the axial position of the slotted nut 4, a connecting line between the circle center of the threaded hole A11 or the threaded hole B13 and the circle center of the slotted nut 4 and a connecting line between the circle center of the craft unthreaded hole A12 and the circle center of the slotted nut 4 form a beta included angle at the end face on the right side of the slotted nut 4, beta is more than 0 degree and less than 90 degrees, and the hole depths of the threaded hole A11 and the threaded hole B13 are the thickness of the nut body A7.

The slotted nut 4 is arranged on a screw rod 1 located on the inner central axis of a cylinder 9, a polished rod section 10-1 and a threaded section 10-2 are arranged at the front end of the screw rod 1, a bearing A2 and a bearing B3 are arranged between the cylinder 9 and the polished rod section 10-1, the bearing A2 and the bearing B3 adopt a radial thrust bearing or a tapered roller bearing, the bearing A2 and the bearing B3 are arranged in a face-to-face or back-to-back mode, the slotted nut 4 is arranged on the threaded section 10-2 close to the bearing B3, the axial position of one of the bearing rings in the bearing A2 or the bearing B3 determines the inner play of the bearing, and the play determines the configuration performance and the operating condition of the bearing.

When a nut adjustment method is adopted for bearing clearance adjustment, a special tool 15 needs to be adopted, the special tool 15 comprises a process unthreaded hole A column 18-1 and a process unthreaded hole B column 18-2 which are respectively and correspondingly inserted into a process unthreaded hole A12 and a process unthreaded hole B14, the process unthreaded hole A column 18-1 and the process unthreaded hole B column 18-2 are both fixedly connected onto a fixing plate A16, the axial position of the process unthreaded hole A column 18-1 and the axial position of the process unthreaded hole B column 18-2 are symmetrical about the axial position of the fixing plate A16 and are parallel to the axial position of the fixing plate A16, a plurality of connecting columns 19 which are parallel to each other are fixedly connected between the fixing plate A16 and the fixing plate B20, the process unthreaded hole C17 is arranged at the center of the fixing plate A16, a square column 21 is connected at the center of the other surface of the fixing plate B20, an inner hexagonal hole 22 is arranged in the square column 21, and the fixing plate A16, the process unthreaded hole B14 and the process unthreaded hole B14 are arranged on the fixing plate A3983, The four axial positions of the fixing plate B20, the square column 21 and the hexagon socket 22 coincide.

The special tool 15 screws the slotted nut 4 through the technical unthreaded hole A12 and the technical unthreaded hole B14 until the screw 1 is difficult to rotate, rotates the screw 1 in the process of screwing the slotted nut 4 so as to enable rolling bodies in the bearing A2 and the bearing B3 to be in correct mounting positions on raceways, unscrews the slotted nut 4 through the technical unthreaded hole A12 and the technical unthreaded hole B14 until the screw 1 freely rotates, generates extrusion force between the threads of the nut body A7 and the nut body B8 and the threads of the thread section 10-2 by respectively adopting a mode of jacking and stressing at the threaded hole A11 and the threaded hole B13 through a jacking screw 6, and ensures the looseness prevention of the slotted nut 4 by utilizing the elastic-plastic deformation of the threads of the slotted nut 4 and the threads of the thread section 10-2. When the internal clearances of the bearing A2 and the bearing B3 change and need to be adjusted, the jacking screw 6 is adjusted to reduce the extrusion force between the thread of the slotted nut 4 and the thread of the thread section 10-2, then the slotted nut 4 is screwed by using the special tool 15 to perform secondary clearance adjustment on the bearing A2 and the bearing B3, and after the clearance adjustment is completed, the jacking screw 6 is adopted to respectively jack and screw the threaded hole A11 and the threaded hole B13 again, so that the centripetal thrust bearing or the tapered roller bearing is ensured to be in a good working condition in a special narrow space.

The invention provides a nut anti-loose method adopting screw jacking, in particular to an anti-loose nut structure and a nut anti-loose method suitable for adjusting clearance of a bearing in a narrow space, comprising the following steps:

s1, screwing the slotted nut 4 through the technical unthreaded hole A12 and the technical unthreaded hole B14 on the nut body A7 by using the special tool 15 until the screw 1 is hard to rotate, and rotating the screw 1 in the process of screwing the slotted nut 4 so as to enable the rolling bodies in the bearing A2 and the bearing B3 to be in the correct installation positions on the raceways;

s2, loosening the slotted nut 4 by using the special tool 15 through the technical unthreaded hole A12 and the technical unthreaded hole B14 on the nut body A7 until the screw rod 1 freely rotates, and realizing the looseness prevention of the nut by adopting a mode that the jacking screw 6 respectively jacks and stresses at the threaded hole A11 and the threaded hole B13;

s3, when the internal clearances of the bearing A2 and the bearing B3 change and need to be adjusted, the jacking screw 6 is adjusted to reduce the extrusion force between the thread of the slotted nut 4 and the thread of the threaded section 10-2, then the slotted nut 4 is screwed by the special tool 15 to perform secondary clearance adjustment on the bearing A2 and the bearing B3, and after the clearance adjustment is completed, the jacking screw 6 is adopted to jack and screw the threaded hole A11 and the threaded hole B13 again respectively.

When the slotted nut 4 adjusts the clearance between the bearing A2 and the bearing B3, the nut body B8 is not provided with a machined hole, so that the deformation of the left end face of the nut body B8 is reduced, and the influence of the clearance adjustment between the bearing A2 and the bearing B3 when the clearance adjustment is performed by using a nut adjustment method is reduced. 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.