CN218867538U

CN218867538U - Locking structure of linear displacement sensor

Info

Publication number: CN218867538U
Application number: CN202223013418.5U
Authority: CN
Inventors: 赵怡越; 尚洁; 包艳; 任正嘉; 刘璐; 皮李刚
Original assignee: Xian Flight Automatic Control Research Institute of AVIC
Current assignee: Xian Flight Automatic Control Research Institute of AVIC
Priority date: 2022-11-11
Filing date: 2022-11-11
Publication date: 2023-04-14
Anticipated expiration: 2032-11-11

Abstract

The utility model belongs to the technical field of linear displacement sensor, a linear displacement sensor locking structure is disclosed, include: the connecting rod frame, the nut, the miniature bearing and the connecting bolt; the connecting bolt comprises a connecting rod section and a threaded section; the thread section is provided with external threads for being in threaded connection with a nut; the thread section is also provided with a coaxial blind hole; the connecting rod frame comprises a thin shaft section and a cylindrical section; the connecting rod frame thin shaft section extends into the coaxial blind hole of the connecting bolt threaded section and is connected with the side wall of the coaxial blind hole through a miniature bearing; the connecting rod frame cylindrical section is used for connecting a linear displacement sensor iron core part; the connecting rod frame thin shaft section is provided with an annular step for installing a miniature bearing, and the end part of the step is also used for limiting the bearing.

Description

Linear displacement sensor locking structure

Technical Field

The utility model discloses the line belongs to linear displacement sensor technical field, concretely relates to linear displacement sensor locking structure.

Background

The basic principle of the linear displacement sensor is that a connecting rod frame pulls an iron core component, linear motion coaxial with a stator component is carried out in a stator winding, magnetic induction lines of a magnetic field generated by the stator winding are cut, the coupling condition between primary and secondary coils is changed, and the induced potential of the secondary coil is changed through the mutual induction effect. In the practical application process of the linear displacement sensor, the externally connected actuator cylinder body may rotate in the working process, and the iron core part of the linear displacement sensor is pulled to rotate around the shaft. When the iron core part rotates along with the external actuating cylinder, the inner wall of a framework in the stator part of the sensor can be scratched, clamping stagnation occurs in the stator part, so that the precision of the sensor is reduced, the performance is deviated, the structure of the sensor can be damaged in serious cases, the actuating cylinder is clamped, and the reliability of the flight control system is damaged.

In order to solve the problem, a double-bearing structure is generally adopted, two miniature ball bearings are arranged on a sensor connecting rod frame, and the outer rings of the bearings are connected with connecting bolts and connected with actuating cylinders through the connecting bolts; the inner ring is connected with a connecting rod frame which pulls the iron core part to move linearly in the stator part. The rotation of the outer ram is isolated from the inner linkage by ball bearings. When the ram is suddenly rotated, the connecting bolt connected to the ram is also rotated. Because of the existence of the bearing, the connecting rod frame can not rotate along with the actuating cylinder, the iron core part can not scratch the inner wall of the stator framework, and the performance of the sensor can not be influenced.

In the prior art, the ball bearing is fixed on the connecting rod frame through the nut, so that the bearing is ensured to be installed at the optimal position, and the bearing is protected from loosening and falling off. With the development of the technology, the application scenarios of the linear displacement sensor are continuously increased, the sensor needs to meet the requirements of more complex use environments, and the requirements on performance and reliability are gradually improved. The prior art bearing fixing method still has high possibility of bearing loosening or falling out due to nut loosening. If the bearing is not hard up, the skew takes place for mounted position, and rotation bite scheduling problem can appear in the sensor, can't satisfy the demand of present linear displacement sensor high reliability. Meanwhile, the accuracy of the sensor may be affected, and the performance may be degraded. There is therefore a need for a more reliable way of locking the bearing.

SUMMERY OF THE UTILITY MODEL

The utility model aims at providing a linear displacement sensor locking structure can stabilize the mounted position of fixing bearing on the connecting rod frame, protects two bearing structure, makes linear displacement sensor's iron core part can not follow the commentaries on classics when external actuator cylinder takes place to rotate, scrapes the skeleton inner wall in the stator part, eliminates iron core and scrapes the influence to the sensor performance. Meanwhile, the linear displacement sensor is prevented from being clamped due to serious scratch of the iron core, and the reliability of the sensor structure is enhanced.

The utility model adopts the technical proposal that:

a linear displacement sensor locking structure, comprising: the connecting rod frame, the nut, the miniature bearing and the connecting bolt;

the connecting bolt comprises a connecting rod section and a threaded section; the thread section is provided with external threads for being in threaded connection with a nut; the thread section is also provided with a coaxial blind hole;

the connecting rod frame comprises a thin shaft section and a cylindrical section; the connecting rod frame thin shaft section extends into the coaxial blind hole of the connecting bolt threaded section and is connected with the side wall of the coaxial blind hole through a miniature bearing; the connecting rod frame cylindrical section is used for connecting a linear displacement sensor iron core part;

the connecting rod frame thin shaft section is provided with an annular step for installing a micro bearing, and the end part of the step is also used for limiting the bearing.

Furthermore, an annular boss is arranged at one end, far away from the connecting frame, of the external thread of the thread section of the connecting bolt, and a section of thread-free area is arranged on the inner surface of the nut and used for being in clearance fit with the annular boss and being fixed in a laser welding mode.

Furthermore, the miniature bearing comprises two ball bearings, and a bearing washer is additionally arranged between the two ball bearings for isolation.

Further, a self-locking nut is arranged on the annular step of the thin shaft section of the connecting rod frame; the self-locking nut is used for locking the miniature bearing on the step.

Further, the self-locking nut comprises a nut section and a hollow circular table section, and the nut section is in threaded connection with the step area of the connecting rod frame slender shaft section; the hollow circular table section is provided with a first radial notch, the connecting rod frame thin shaft section is also provided with a second radial notch, and the first radial notch and the second radial notch are inserted through split pins to prevent the self-locking nut from rotating.

Furthermore, a flat washer is arranged between the self-locking nut and the miniature bearing.

The utility model discloses beneficial effect who has: the linear displacement sensor uses a double-bearing structure, and the problem that an iron core part possibly scrapes the inner wall of a stator framework due to the sudden rotation of an external actuator cylinder in the application process of the linear displacement sensor is solved. However, in the prior art, the locking structure of the bearing is not firm, and the risk of loosening or falling off exists. The utility model discloses a structure is on duplex bearing structure's basis, changes the mode that traditional nut is fixed into the mode of auto-lock nut and split pin combination locking, and fixed miniature bearing improves sensor structure's reliability.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required to be used in the embodiments of the present invention will be briefly described below, and it is obvious that the drawings described below are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.

FIG. 1 is a schematic three-dimensional mounting diagram of a locking structure of a linear displacement sensor

FIG. 2 is a two-dimensional cross-sectional view of the linear displacement sensor locking structure;

1-connecting rod frame, 2-nut, 3-miniature bearing, 4-bearing washer, 5-flat washer, 6-self-locking nut, 7-split pin and 8-connecting bolt.

Detailed Description

In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the attached drawings in the embodiments of the present invention will be combined below to clearly and completely describe the technical solution in the embodiments of the present invention. It is to be understood that the embodiments described are only some of the embodiments of the present invention, and not all of them. Based on the embodiments in the present invention, all other embodiments obtained by a person of ordinary skill in the art without creative work belong to the protection scope of the present invention.

Features and illustrative embodiments of various aspects of the invention are described in detail below. In the following detailed description, numerous specific details are set forth in order to provide a thorough understanding of the invention. It will be apparent, however, to one skilled in the art that the present invention may be practiced without some of these specific details. The following description of the embodiments is merely intended to provide a better understanding of the invention by illustrating examples of the invention. The present invention is in no way limited to any specific arrangement and method set forth below, but rather covers any improvement, replacement or modification of structures, methods, devices without departing from the spirit of the invention. In the drawings and the following description, well-known structures and techniques are not shown to avoid unnecessarily obscuring the present invention.

It should be noted that, in case of conflict, the embodiments and features of the embodiments of the present invention may be combined with each other, and the embodiments may be referred to and cited as each other. The present invention will be described in detail below with reference to the accompanying drawings in conjunction with embodiments.

As shown in fig. 1 and 2, a locking structure of a linear displacement sensor mainly comprises: the connecting rod frame comprises a connecting rod frame 1, a nut 2, a miniature bearing 3, a bearing washer 4, a flat washer 5, a self-locking nut 6, a cotter pin 7 and a connecting bolt 8.

The link holder 1 has a structure in which the front end is a thin shaft shape and the rear end is a large cylindrical shape, and is used for mounting an iron core member. The rear end cylinder is provided with four threaded holes which are matched with the connecting rod on the iron core part; the front end thin shaft is provided with steps for mounting the micro bearing, and the side surface of the top end of the thin shaft is provided with a through hole for inserting a cotter pin. The nut 2 has a cylindrical structure with a step at the front end. The inner wall is provided with threads which are matched with the threads on the connecting bolt; the inner wall of the step is matched with the boss on the connecting bolt in size and then connected by laser welding. The micro-bearing 3 is a two standard piece ball bearing. And a bearing washer 4 is additionally arranged in the two ball bearings. The bearing is mounted on the step of the connecting rod frame. The flat washer 5 is arranged on the connecting rod frame and separates the self-locking nut from the bearing. The self-locking nut 6 is a standard part, the lower end of the self-locking nut is in a nut shape, the upper end of the self-locking nut is in a round table shape, the side face of the self-locking nut is provided with a notch, the inner wall of the self-locking nut is a through hole, the self-locking nut and the flat washer are installed on the connecting rod frame together, and the inner ring of the bearing is pressed. The split pin 7 is a hairpin-shaped standard component and is inserted into the self-locking nut groove and the front end hole of the connecting rod frame to prevent the relative rotation of the nut and the connecting rod frame. The connecting bolt 8 is cylindrical, the bottom of the connecting bolt is provided with a blind hole, and parts such as a connecting rod frame, a bearing, a gasket, a self-locking nut, an opening pin and the like are inserted into the blind hole; the outer wall of the blind hole is provided with threads which are matched with the internal threads of the nut and are connected with each other; and bosses are arranged on the middle section of the connecting bolt and the outer wall of the front side of the blind hole, are matched with the inner wall of the step at the front end of the nut and are connected with the inner wall of the step at the front end of the nut through laser welding. The front end of the connecting bolt is in a thin shaft shape, and the outer wall of the top end of the connecting bolt is provided with threads and is connected with the external actuating cylinder.

The mounting process of the locking structure of the linear displacement sensor comprises the following steps: the connecting rod frame is arranged in the inner hole of the nut, the two ball bearings and the bearing washer are arranged on the connecting rod frame, and then the flat washer and the self-locking nut are arranged in the connecting rod frame to tightly press the inner ring of the bearing. The split pin is inserted into a groove on the side surface of the self-locking nut and a hole on the thin shaft of the connecting rod frame, and the tail part of the split pin is pulled open to prevent the self-locking nut and the connecting rod frame from rotating relatively. Coating a small amount of anaerobic adhesive on the threads on the outer wall of the blind hole of the connecting bolt, screwing the connecting bolt into the nut, and cleaning the residual adhesive. And laser welding is carried out on the joint of the boss on the side surface of the connecting bolt and the step at the front end of the nut along the circumferential direction, so that the connecting bolt and the nut are ensured to be connected tightly and reliably.

In the practical example, the self-locking nut and the cotter pin are standard parts. On traditional duplex bearing structure's basis, through the locking structure of auto-lock nut and split pin, fixed ball bearing, the protection bearing can not become flexible and deviate from, and the connecting rod frame can not rotate thereupon when guaranteeing outside pressurized strut to rotate suddenly, and the stator skeleton inner wall can not scraped to unshakable in one's determination, prevents the performance skew and the motion jamming of the sensor that from this produce, improves the performance and the structural reliability of sensor.

Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present invention, but the protection scope of the present invention is not limited thereto, and any person skilled in the art can easily think of various equivalent modifications or substitutions within the technical scope of the present invention, and these modifications or substitutions should be covered within the protection scope of the present invention.

Claims

1. The utility model provides a linear displacement sensor locking structure which characterized in that: the structure includes: the connecting rod frame, the nut, the miniature bearing and the connecting bolt;

the connecting rod frame thin shaft section is provided with an annular step for installing a miniature bearing, and the end part of the step is also used for limiting the bearing.

2. The structure of claim 1, wherein: the connecting bolt is characterized in that an annular boss is arranged at one end, far away from the connecting frame, of the external thread of the thread section of the connecting bolt, and a section of thread-free area is arranged on the inner surface of the nut and used for being in clearance fit with the annular boss and fixed through laser welding.

3. The structure of claim 1, wherein: the miniature bearing comprises two ball bearings, and a bearing washer is additionally arranged between the two ball bearings for isolation.

4. The structure of claim 1, wherein: the annular step of the thin shaft section of the connecting rod frame is also provided with a self-locking nut; the self-locking nut is used for locking the miniature bearing on the step.

5. The structure of claim 4, wherein: the self-locking nut comprises a nut section and a hollow circular table section, and the nut section is in threaded connection with a step area of the connecting rod frame slender shaft section; the hollow circular table section is provided with a first radial notch, the connecting rod frame thin shaft section is also provided with a second radial notch, and the first radial notch and the second radial notch are inserted through split pins to prevent the self-locking nut from rotating.

6. The structure of claim 5, wherein: and a flat washer is also arranged between the self-locking nut and the miniature bearing.