CN110821966A

CN110821966A - Axial clearance adjusting device

Info

Publication number: CN110821966A
Application number: CN201911176670.8A
Authority: CN
Inventors: 宋雪群
Original assignee: Chengdu Guoyi Electronic Technology Co Ltd
Current assignee: Chengdu Guoyi Electronic Technology Co Ltd
Priority date: 2019-11-26
Filing date: 2019-11-26
Publication date: 2020-02-21

Abstract

The invention discloses an axial clearance adjusting device, which is used for adjusting the axial clearance of a vertical shaft bearing by adjusting the tightness of a bearing thread pressing ring, and can quickly, simply and conveniently adjust the axial clearance without disassembling an installed part; meanwhile, the bearing is limited through a structural form of fixing the gland, the bearing thread pressing ring is locked through the flat-end set screw, the gap on the bearing shaft is eliminated through the mode of adding thread adjustment and stopping the set screw, the problem that the conventional vertical shaft needs to be disassembled and assembled for many times due to gaskets or thick or thin strips in the process of mounting the vertical shaft is solved, and the photoelectric stable platform has the advantages of small volume, light weight, compact structure and the like, can effectively improve the control precision of the photoelectric stable platform, is stable and reliable, and cannot be loosened even if the load changes greatly; the assembly efficiency can be greatly improved, the assembly error is smaller, the rotation precision is higher, the bearing capacity of a shaft system is larger, and a good stable condition is provided for the photoelectric stable platform in subsequent operation.

Description

Axial clearance adjusting device

Technical Field

The invention relates to the technical field of mechanical equipment manufacturing, in particular to an axial clearance adjusting device.

Background

The volume and weight of the photoelectric stabilization platform are always main problems considered by structural designers due to the limitation of airborne conditions; in the prior art, most small photoelectric platforms adopt a structural form of two shafts and two frames, namely a vertical shaft system and a pitching shaft system; the vertical shaft system mainly comprises an azimuth rotary transformer, an azimuth torque motor, a bearing, a vertical shaft and the like; the vertical shaft system is an azimuth rotation shaft system of the photoelectric stabilization platform, generally represented as a cantilever shaft, supports most of loads of the whole equipment, and drives and measures the angle of azimuth rotation, and the design quality directly affects the reliability, precision and the like of the whole equipment, so the design of the vertical shaft system is one of the key technologies of the whole photoelectric stabilization equipment.

In the design of a vertical shaft system, the rotation precision is the primary consideration target; however, some errors, such as machining errors, assembly gaps, bearing runout, friction, temperature and the like, are inevitably generated in the actual machining, assembly and use processes, wherein the assembly gaps, particularly the axial gaps of the bearings, are completely adjustable.

In consideration of factors such as cost and space limitation, the traditional vertical shaft system generally adopts 2 universal angular contact ball bearings to be paired for use, the bearing clearance adjustment generally adopts a form of adding a gasket, and the gasket, the shim and the like with proper sizes are used for applying pre-tightening on the bearing after the bearing clearance adjustment is designed according to the principle and is repeatedly adjusted for many times; the device has the advantages of convenient installation, large axial constraint force and difficult looseness; the defect is that the adjustment can be completed only by dismounting and mounting for many times, and the dimensional accuracy of the bearing hole can be damaged by dismounting and mounting for many times, so that the mounting accuracy is influenced, and the production efficiency is lower.

Disclosure of Invention

In order to solve the problems, the invention provides an axial clearance adjusting device which comprises a first bearing seat, a first bearing thread pressing ring, an angular contact bearing, a vertical shaft, an inner gland and a flat end set screw; the inner ring and the outer ring of the angular contact bearing are respectively in matched contact with the vertical shaft and the inner hole of the first bearing seat, and the inner gland is fixed on the vertical shaft through a combined screw; the tightness of the first bearing threaded pressing ring screwed into the vertical shaft and locked by the flat-end fastening screw is adjusted, so that the quick and simple axial clearance adjustment is realized.

Preferably, the bearing further comprises a second bearing seat arranged above the first bearing seat, a bearing gland, a deep groove ball bearing and a nut.

Preferably, the deep groove ball bearing is placed in an inner hole of the second bearing seat and is fixed on a vertical shaft along with the second bearing seat; the inner diameter and the outer diameter of the deep groove ball bearing are respectively in matched contact with the outer diameter of the vertical shaft and the inner diameter of the second bearing seat; the bearing gland is fixedly connected with the second bearing seat through a combined screw; the nut is used for limiting the deep groove ball bearing.

Preferably, the bearing further comprises an outer gland and a second bearing threaded clamping ring; the inner ring of the deep groove ball bearing is in fit contact with a vertical shaft, and the vertical shaft fixes an inner gland through a combined screw; the outer ring of the deep groove ball bearing is in matched contact with the inner hole of the first bearing seat, and the outer gland locks the deep groove ball bearing through a screw.

Preferably, the inner diameter of the deep groove ball bearing is in fit contact with the outer diameter of the vertical shaft, and the nut limits the deep groove ball bearing.

Preferably, the outer diameter of the deep groove ball bearing is in fit contact with the inner diameter of the second bearing seat, the second bearing threaded pressing ring can be screwed according to conditions to quickly adjust the clearance, and the flat-end set screw is used for preventing the second bearing threaded pressing ring from loosening.

The invention has the beneficial effects that: the invention is suitable for any miniature, small-sized and even medium-sized photoelectric stable platform, and can quickly select the vertical axis scheme according to the given structure volume; the precision of the structure can be changed according to the requirements of the selected bearing, and the application range is wide.

The gap on the bearing shaft is eliminated by adding the thread adjustment and the locking screw for stopping, the problem that the conventional vertical shaft needs to be disassembled and assembled for many times due to a gasket or a thick or thin strip when being installed is solved, and the device has the advantages of small volume, light weight, compact structure and the like, can effectively improve the control precision of the photoelectric stable platform, is stable and reliable, and cannot be loosened even if the load changes greatly; the assembly efficiency can be greatly improved, the assembly error is ensured to be smaller, and good conditions are provided for the operation of subsequent equipment.

Drawings

FIG. 1 is a schematic structural view of an embodiment of an axial gap adjustment apparatus;

FIG. 2 is a schematic view of an embodiment of an axial gap adjustment apparatus installed;

FIG. 3 is a schematic structural view of an axial gap adjusting device according to two embodiments

FIG. 4 is a schematic structural view of an axial gap adjusting device according to three embodiments;

in the figure: the bearing comprises a bearing body, a bearing seat, a bearing cover, a bearing nut, a bearing press cover, a deep groove ball bearing, a nut, a bearing.

Detailed Description

In order to more clearly understand the technical features, objects, and effects of the present invention, embodiments of the present invention will now be described with reference to the accompanying drawings.

Example 1.

In this embodiment, an axial gap adjusting device as shown in fig. 1 and fig. 2 includes a first bearing seat 1, a first bearing threaded pressing ring 2, an angular contact bearing 3, a vertical shaft 4, an inner gland 5 and a flat end set screw 6; an inner ring of the angular contact bearing 3 is in matched contact with a vertical shaft 4, an inner gland 5 is fixed on the vertical shaft 4 through a combined screw, an outer ring of the angular contact bearing 3 is in matched contact with an inner hole of a first bearing seat 1, and a first bearing threaded pressing ring 2 is screwed into the angular contact bearing 3.

In order to accurately adjust the clearance on the bearing shaft, the first bearing thread pressing ring 2 adopts fine threads; in order to obtain an appropriate preload amount, it is necessary to adjust the play while detecting the starting friction torque; further to prevent the first bearing threaded pressure ring 2 from loosening, the first bearing threaded pressure ring 2 is locked by the flat-end set screw 6.

In the process of adjusting the axial clearance of the first vertical shaft, the clearance on the shaft can be quickly, simply and conveniently adjusted by only adjusting the tightness of the first bearing threaded pressing ring 2 without disassembling the installed parts.

Example 2.

Further, in order to better adjust the bearing clearance, 1 deep groove ball bearing is added on the basis of the graph 1 and the graph 2 to form a bearing matching structure of '2 + 1', namely, an axial clearance adjusting device as shown in the graph 3, after the axial clearance adjusting device is installed according to the embodiment 1, the deep groove ball bearing 9 is placed into the second bearing seat 7 and then is installed into the vertical shaft 4 together, the outer diameter of the deep groove ball bearing 9 is matched with the inner diameter of the second bearing seat 7, the bearing pressing cover 8 is fixedly connected with the second bearing seat 7 through a combined screw, the inner diameter of the deep groove ball bearing 9 is matched with the outer diameter of the vertical shaft 4, and the limiting is carried out through a nut 10; here, the nut 10 may also take the form of a gland-fixed construction, i.e. similar to the way in which the inner gland 5 is mounted; the structural form can fully embody the stepless adjustment through the thread pair, ensure that the assembly error is smaller, the rotation precision is higher, the bearing capacity of the shaft system is larger, and provide good stable conditions for the photoelectric stable platform in the subsequent operation.

Example 3.

In the case where the height space of embodiment 1 is satisfied and embodiment 2 is not satisfied, another solution is proposed: in addition to fig. 3, the axial gap adjusting device shown in fig. 4 is configured by replacing the pair of angular contact bearings 3 with deep groove ball bearings 9.

An axial clearance adjusting device, an inner ring of a deep groove ball bearing 9 is in matched contact with a vertical shaft 4, an inner gland 5 is fixed on the vertical shaft 4 through a combined screw, an outer ring of the deep groove ball bearing 9 is in matched contact with an inner hole of a first bearing seat 1, an outer gland 11 locks a bearing through a screw, the deep groove ball bearing 9 is placed in a second bearing seat 7 and then is placed in the vertical shaft 4 together, the inner diameter of the deep groove ball bearing 9 is matched with the outer diameter of the vertical shaft 4, a nut 10 is used for limiting, the outer diameter of the deep groove ball bearing 9 is matched with the inner diameter of the second bearing seat 7, a second bearing threaded pressing ring 12 is used for screwing according to conditions, and a flat end fastening screw 6 is used; the nut 10 can also adopt a structure form of fixing a gland; the bearing backlash eliminating mode of the small and light photoelectric stable platform can also meet the use requirement of the rotation precision of a vertical shaft system.

According to the scheme, the axial clearance of the vertical shaft bearing is adjusted by adjusting the tightness of the bearing thread pressing ring, and the clearance on the shaft can be quickly, simply and conveniently adjusted without disassembling the installed parts; meanwhile, the bearing is limited through a structural form of fixing the gland, and the bearing thread pressing ring is locked through the flat-end fastening screw, so that the structural form can fully reflect the stepless property of adjustment through the thread pair, the assembly error is ensured to be smaller, the rotation precision is higher, the bearing capacity of a shaft system is larger, and a good stable condition is provided for the photoelectric stable platform in subsequent operation.

The foregoing shows and describes the general principles and broad features of the present invention and advantages thereof. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, which are described in the specification and illustrated only to illustrate the principle of the present invention, but that various changes and modifications may be made therein without departing from the spirit and scope of the present invention, which fall within the scope of the invention as claimed. The scope of the invention is defined by the appended claims.

Claims

1. An axial clearance adjusting device is characterized by comprising a first bearing seat (1), a first bearing thread pressing ring (2), an angular contact bearing (3), a vertical shaft (4), an inner gland (5) and a flat end set screw (6); the inner ring and the outer ring of the angular contact bearing (3) are respectively in matched contact with the vertical shaft (4) and the inner hole of the first bearing seat (1), and the inner gland (5) is fixed on the vertical shaft (4) through a combined screw; the tightness of the first bearing thread pressing ring (2) which is screwed into the vertical shaft (4) and locked by the flat-end fastening screw (6) is adjusted, so that the quick, simple and convenient on-shaft clearance adjustment is realized.

2. An axial gap adjustment device according to claim 1, characterized by further comprising a second bearing seat (7) arranged above the first bearing seat (1), a bearing gland (8), a deep groove ball bearing (9) and a nut (10).

3. An axial gap adjustment device according to claim 2, characterized in that the deep groove ball bearing (9) is placed in the inner bore of the second bearing block (7) and fixed with the second bearing block (7) to the vertical shaft (4); the inner diameter and the outer diameter of the deep groove ball bearing (9) are respectively in matched contact with the outer diameter of the vertical shaft (4) and the inner diameter of the second bearing seat (7); the bearing gland (8) is fixedly connected with the second bearing seat (7) through a combined screw; the nut (10) is used for limiting the deep groove ball bearing (9).

4. An axial gap adjusting apparatus according to claim 1 or 3, further comprising an outer gland (11) and a second bearing screw retainer (12); an inner ring of the deep groove ball bearing (9) is in fit contact with a vertical shaft (4), and the vertical shaft (4) is fixed with an inner gland (5) through a combined screw; the outer ring of the deep groove ball bearing (9) is in fit contact with the inner hole of the first bearing seat (1), and the outer gland (11) locks the deep groove ball bearing (9) through a screw.

5. An axial gap adjustment device according to claim 4, characterized in that the inner diameter of the deep groove ball bearing (9) is in mating contact with the outer diameter of the vertical shaft (4), and the nut (11) limits the deep groove ball bearing (9).

6. An axial gap adjustment device according to claim 4, characterized in that the outer diameter of the deep groove ball bearing (9) is in fitting contact with the inner diameter of the second bearing seat (7), the second bearing threaded clamping ring (12) can be screwed according to circumstances to quickly adjust the gap, and the flat set screw (6) is used to prevent the second bearing threaded clamping ring (12) from loosening.