CN218000164U - Improved structure for axial positioning of rotary shafting bearing in inertial navigation system - Google Patents

Abstract

The utility model relates to an be used to improved structure of rotary shafting bearing axial positioning among navigation system, characteristics are: the floating end bearing axial positioning structure comprises a floating end bearing bush, a floating end adjusting gasket, a floating end thrust ring, a floating end shaft and a compression sleeve; the top of an inner hole of the floating end bearing bush is provided with a thrust ring mounting cavity, and the bottom of the floating end bearing bush is provided with a cross-shaped notch; the floating end adjusting gasket is composed of an inner ring, an outer ring and a cross rib; the movable end thrust ring is embedded and fixed in the thrust ring mounting cavity, the movable end adjusting gasket is embedded and matched with a cross-shaped notch of the movable end bearing bush through a cross rib, an inner ring of the movable end adjusting gasket is embedded in an inner hole of the movable end bearing bush, and the movable end adjusting gasket is fixedly connected with the movable end bearing bush through a screw; the outer ring of the floating end bearing is fixedly pressed through the inner end surface of the floating end thrust ring and the outer end surface of the inner ring of the floating end adjusting gasket. This structure has improved assembly efficiency and assembly precision.

Description

Improved structure for axial positioning of rotary shafting bearing in inertial navigation system

Technical Field

The utility model belongs to the technical field of high accuracy inertial navigation system, concretely relates to be used to improved structure of rotary shafting bearing axial positioning among navigation.

Background

In a high-precision inertial navigation system, a multi-axis rotational hardening and tempering technology is usually adopted to improve the precision of the navigation system, and a pair of angular contact ball bearings are respectively adopted at two ends of each axis as axis bearings. The bearings are used in pairs, and set pretightening force is added to the rotary shaft system, so that the shaft system is high and stable in precision during rotation. Each pair of bearings is usually installed back to back, the inner and outer rings of the bearings are respectively matched with the rotating shaft and the bearing bush to achieve radial positioning, and axial positioning is generally achieved through a shaft shoulder and a locking nut. However, axial positioning is only completed at this time, and if a relatively large impact load is encountered, the inertial force of the whole system is concentrated on the bearing balls, so that the bearing is easily damaged.

Usually, one end of a shaft system is assembled firstly, an outer ring of the shaft system is fixed with a thrust ring by a bearing bush, an inner ring of the shaft system is fixed with a lock nut by a shaft shoulder, then the other end of the shaft system is assembled, a bearing inner ring of the other end is still fixed with the lock nut by a shoulder, the outer ring is positioned by measuring the distance between a bearing outer ring positioning surface of the bearing bush and a bearing inner ring positioning shaft shoulder and the height difference between the bearing inner ring and the bearing outer ring by the shaft shoulder, and an adjusting pad is ground according to the height difference, so that when the thrust ring and the lock nut are screwed, the inner ring and the outer ring of the bearing are fixed simultaneously.

SUMMERY OF THE UTILITY MODEL

The utility model aims at overcoming prior art's weak point, providing a can improve assembly efficiency and assembly precision be used to lead among the system improvement structure of rotary shafting bearing axial positioning.

The above object of the present invention is achieved by the following technical solutions:

the utility model provides an improved structure of gyration shafting bearing axial positioning in system of being used to lead, includes fixed end bearing axial positioning structure and end bearing axial positioning structure that moves about, its characterized in that:

the moving end bearing axial positioning structure comprises a moving end bearing bush, a moving end adjusting gasket, a moving end thrust ring, a moving end shaft and a pressing sleeve; the inner ring of the floating end bearing is pressed and fixed by a shaft shoulder of the floating end shaft and the inner end of the pressing sleeve; 4 counter bores are uniformly distributed on an outer ring flange of the moving end bearing bush, a thrust ring mounting cavity is formed in the top of an inner hole of the moving end bearing bush, and a cross-shaped notch is formed in the bottom of the moving end bearing bush; the floating end adjusting gasket is composed of an inner ring, an outer ring and a cross rib connected with the inner ring and the outer ring, and 4 threaded holes are uniformly processed on the outer ring along the circumferential direction; the shape of the cross rib is consistent with that of a cross notch on the bearing bush at the moving end; the movable end thrust ring is embedded and fixed in the thrust ring mounting cavity, the movable end adjusting gasket is in embedded fit with a cross-shaped gap of the movable end bearing bush through a cross rib, an inner ring of the movable end adjusting gasket is embedded in an inner hole of the movable end bearing bush, and the movable end adjusting gasket is fixedly connected with the movable end bearing bush through a screw; and the outer ring of the floating end bearing is fixedly pressed through the inner end surface of the floating end thrust ring and the outer end surface of the inner ring of the floating end adjusting gasket.

And further: the outer diameter of the inner ring of the floating end adjusting gasket is smaller than the inner bore diameter of the floating end bearing bush.

The utility model has the advantages of and positive effect:

1. the utility model discloses bearing bush and adjusting shim in the location end that moves about with current rotary shafting bearing axial positioning carry out the modification design, both form through cross muscle and cross breach and inlay the dress cooperation, this kind of cooperation mode, screw through connecting bearing bush and adjusting shim, can realize adjusting shim's reverse fixed locking, in addition, locking volume through adjusting screw, can realize adjusting shim embedding depth's fine setting, the axial fixity of location end bearing inner race that moves about has been guaranteed, thereby avoided measuring, join in marriage links such as doing, make the assembly precision, assembly efficiency obtains improving.

2. The utility model discloses simple structure realizes through the structure of revising bearing bush and adjusting shim that increase 4 mounting holes and the cross breach card that the precision is not high on bearing bush to get rid of former bearing end face locating surface, be favorable to the improvement of the machining precision of bearing circumference locating surface.

3. The utility model discloses to the structure of base and other parts hardly influence, do not destroy system's rigidity.

Drawings

FIG. 1 is a schematic view of a prior art bearing positioning structure;

fig. 2 is a schematic view of an improved structure of the floating end bearing bush of the present invention;

FIG. 3a is a schematic cross-sectional view of an improved structure of the floating end spacer of the present invention;

FIG. 3b is a top view of the improved floating end spacer of the present invention;

fig. 4 is a schematic view of the improved structure of the floating end bearing axial positioning of the present invention.

Detailed Description

The structure of the present invention will be further explained by embodiments with reference to the accompanying drawings. It is to be understood that this embodiment is illustrative and not restrictive.

Referring to fig. 1, a table body 2 is mounted on a base frame 1 through a middle rotary shaft system, and referring to fig. 1, a positioning mode of a bearing of an existing shaft system is as follows: the inner and outer rings of the bearing of the fixed end are fixed, the inner ring of the bearing 13 of the fixed end is locked by the shaft shoulder of the shaft 11 of the fixed end and the pressing shaft sleeve 15 of the fixed end, and the outer ring of the bearing is locked by the pressing plate 14 of the bearing of the fixed end and the bush 12 of the bearing of the fixed end, so that the axial position of the system shaft system is fixed. The inner ring of the moving end bearing 5 is locked by a shaft shoulder of the moving end shaft 3 and a pressing sleeve 6, the pressing sleeve is pressed and fixed through a moving end locking nut 10, the pressing sleeve and the moving end shaft are connected through a key 9, the distance between the positioning surface of the inner ring of the moving end bearing and the positioning surface of the mounting outer ring of the moving end bearing bush is measured, a moving end adjusting gasket piece 7 is processed according to the distance, and the outer ring of the moving end bearing can be locked by a moving end bearing bush 4 (containing an adjusting gasket) and a thrust ring 8.

The structure of the utility model is shown in figure 2:

the invention relates to an improved structure for axial positioning of a rotary shafting bearing in an inertial navigation system, which keeps a fixed end structure unchanged (referring to the prior fixed end fixing mode), and has the following invention points: the improved design of the moving end is as follows: the floating end bearing bush and the floating end adjusting gasket are improved, the improved floating end bearing bush 16 is shown in figure 2, a positioning surface of a bearing outer ring arranged at the bottom of the bearing bush is removed, and a cross gap 16.1 is formed. The improved floating end adjusting shim 17 has a structure shown in fig. 3a and 3b, and is composed of an inner ring 17.1, an outer ring 17.3 and a cross rib 17.2 connected with the inner ring and the outer ring, wherein 4 threaded holes are uniformly formed in the outer ring along the circumferential direction. When the floating end adjusting gasket is installed, the cross rib of the floating end adjusting gasket is arranged at the cross notch of the floating end bearing bush, and the inner ring of the floating end adjusting gasket is embedded in the inner hole of the floating end bearing bush. When the movable end bearing is installed, the installation mode of the inner ring of the movable end bearing is unchanged (refer to the existing installation mode), the outer ring is screwed by the screw holes at the 4 positions and pulls the adjusting washer to press the outer ring of the bearing, and the outer ring of the bearing at the other end is still pressed by the thrust ring. Thus, the inner and outer rings of the bearing are effectively fixed.

Although the embodiments of the present invention and the accompanying drawings are disclosed for illustrative purposes, those skilled in the art will appreciate that: various substitutions, changes and modifications are possible without departing from the spirit of the invention and the scope of the appended claims, and therefore the scope of the invention is not limited to the disclosure of the embodiments and the accompanying drawings.

Claims (2)

1. The utility model provides an improved structure of bearing axial positioning of rotary shafting among system of being used to lead, includes fixed end bearing axial positioning structure and end bearing axial positioning structure that moves about, its characterized in that:

the floating end bearing axial positioning structure comprises a floating end bearing bush, a floating end adjusting gasket, a floating end thrust ring, a floating end shaft and a compression sleeve; the inner ring of the floating end bearing is pressed and fixed by a shaft shoulder of the floating end shaft and the inner end of the pressing sleeve; 4 counter bores are uniformly distributed on an outer ring flange of the moving end bearing bush, a thrust ring mounting cavity is formed in the top of an inner hole of the moving end bearing bush, and a cross-shaped notch is formed in the bottom of the moving end bearing bush; the floating end adjusting gasket is composed of an inner ring, an outer ring and a cross rib connected with the inner ring and the outer ring, and 4 threaded holes are uniformly processed on the outer ring along the circumferential direction; the shape of the cross rib is consistent with that of a cross notch on the bearing bush at the movable end; the movable end thrust ring is embedded and fixed in the thrust ring mounting cavity, the movable end adjusting gasket is in embedded fit with a cross-shaped gap of the movable end bearing bush through a cross rib, an inner ring of the movable end adjusting gasket is embedded in an inner hole of the movable end bearing bush, and the movable end adjusting gasket is fixedly connected with the movable end bearing bush through a screw; and the outer ring of the floating end bearing is fixedly pressed through the inner end surface of the floating end thrust ring and the outer end surface of the inner ring of the floating end adjusting gasket.

2. The improved structure for axially positioning the bearing of the rotary shafting in the inertial navigation system according to claim 1, wherein: the outer diameter of the inner ring of the floating end adjusting gasket is smaller than the inner bore diameter of the floating end bearing bush.

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