CN210087825U

CN210087825U - Flexible thrust bearing

Info

Publication number: CN210087825U
Application number: CN201920781569.4U
Authority: CN
Inventors: 薛飞; 南飞艳; 耿建成; 周林
Original assignee: NO 12 INST CHINA MARINE HEAVY INDUSTRY GROUP Co
Current assignee: NO 12 INST CHINA MARINE HEAVY INDUSTRY GROUP Co
Priority date: 2019-05-28
Filing date: 2019-05-28
Publication date: 2020-02-18
Anticipated expiration: 2029-05-28

Abstract

The flexible thrust bearing is composed of a bearing bush body and a bearing bush sleeve, the excircle of the bearing bush body is an outer spherical surface, the inner hole of the bearing bush sleeve is an inner spherical surface, and the matching surface of the bearing bush sleeve and the bearing bush body is a spherical surface, so that a universal joint is formed; after assembly, when the gap between the working surface of the bearing bush body and the shaft shoulder surface of the rotor is not uniform due to assembly error, sudden stress of the rotor and long-term operation deformation of the rotor, the bearing bush body can be rotated and adjusted at any time in the bearing bush sleeve under the pressure of an oil film entering between the rotor and the bearing bush body through the high-pressure oil hole until the gap is uniform; in order to facilitate the installation of the shaft, the bearing bush body and the bearing bush sleeve are both designed into split structures and are connected with the pin through a screw; the utility model discloses a bearing bush body can rotate wantonly in the axle bush cover under oil film pressure to follow the rotor and at the deformation and the bending of operation in-process, guarantee constantly that the oil film clearance equals between thrust working face and rotor shaft shoulder, make each point load evenly distributed on the bearing working face, guarantee the smooth operation of rotor.

Description

Flexible thrust bearing

Technical Field

The utility model belongs to the technical field of machinery class slide bearing, in particular to flexible footstep bearing can carry out the real-time adjustment along with the installation error of rotor and the slope or the little deformation degree of rotor in the use, makes load evenly distributed on the thrust tile working face, the powerful stable operation of having guaranteed the rotor.

Background

The main function of the sliding bearing in mechanical transmission is to support the load of the rotor (transmission) and ensure the stable operation of the rotor, and the structure and the precision of the bearing are key factors for the stable operation of the rotor. Currently, thrust bearings mainly have two forms: a tilt-flat pad thrust bearing (as shown in fig. 1) and a tilting pad thrust bearing (as shown in fig. 2). The inclined-plane tile thrust bearing directly fixes the bearing on the box body tile seat in the using process, is static in a transmission system, and has a working surface consisting of an inclined surface and a plane surface, a shaft shoulder and the inclined surface of the bearing working surface form an oil wedge when a rotor rotates, and a dynamic pressure oil film is formed between the bearing and the rotor under the rotation of the rotor, is mainly used for the medium-sized and small-sized thrust bearings, and has the maximum direct diameter of about 600 mm; however, the rotor can not be in an ideal horizontal or vertical state but has a certain degree of bending deformation after being installed or in the loading and rotating process, and the inclined-plane tile thrust bearing has the defects that the bearing is fixed on the box body and can not incline along with the bending deformation of the shaft, so that a certain included angle is formed between a rotor shaft shoulder and a bearing working surface in the working process, the oil film gap between the shaft shoulder and the bearing working surface is not uniform, and the load distribution of each point on the thrust tile working surface is not uniform. The tilting pad thrust bearing is characterized in that the tilting pad is firstly arranged on the base body, then the base body is fixed on the box body pad seat, and in a free state, the tilting pad can swing and tilt freely around the ball top of the tilting pad, so that the tilting pad thrust bearing can adapt to the change of working conditions during working and automatically adjust the tilting direction and the inclination. The bearing is suitable for large, medium and small bearings, and is most widely applied to large bearings. The tilting pad thrust bearing has the disadvantages that each pad is only inclined to adjust along with the change of working conditions, the integral positioning points of all pads in a circle are on the same plane, when a rotor bends and deforms, each pad can incline along with the bending of the rotor, the working surface of each thrust pad is parallel to a rotor shoulder under oil pressure, but oil film gaps between each thrust pad and the rotor shoulder are different, and the load distribution on each thrust pad is uneven.

Disclosure of Invention

In order to overcome the defects of the prior art, the utility model aims at providing a flexible thrust bearing, can carry out suitability adjustment along with the installation error of rotor and the slope or the little degree of deformation of rotor in the use, make on the thrust tile working face each point load evenly distributed to the steady operation of rotor has been guaranteed.

In order to achieve the above purpose, the technical scheme of the utility model is that:

the flexible thrust bearing comprises a bearing bush body 8 and a bearing bush sleeve 10, wherein a high-pressure oil hole 9 is formed in the bearing bush body 8, the outer circle of the bearing bush body 8 is an outer spherical surface, the inner hole of the bearing bush sleeve 10 is an inner spherical surface, and the matching surface of the bearing bush sleeve 10 and the bearing bush body 8 is a spherical surface, so that a universal joint is formed.

The spherical clearance between the bearing bush body 8 and the bearing bush sleeve 10 is 0.03-0.06mm, and the spherical roughness is Ra0.8.

The thrust working surface of the bearing bush body 8 is compounded with a layer of bearing alloy, the bearing alloy surface is provided with n equal parts of evenly distributed oil wedge surfaces, and n is 6-12, so that an oil film layer is formed between the alloy surface and a shaft shoulder when the rotor is started.

The bearing bush body 8 and the bearing bush sleeve 10 are of a split structure.

The utility model has the advantages that: the bearing bush body 8 with the working surface of the flexible bearing can rotate freely in the bearing bush sleeve under the pressure of an oil film so as to conform to the deformation and bending of the rotor in the operation process, the oil film clearance between the thrust working surface and the shaft shoulder of the rotor is constantly ensured to be equal, the load of each point on the working surface of the bearing is uniformly distributed, and the stable operation of the rotor is ensured.

Drawings

Fig. 1 is a schematic structural view of a prior art inclined-plane shoe thrust bearing, in fig. 1: 1 is an inclined-plane tile thrust bearing rotor, and 2 is a thrust bearing.

Fig. 2 is a schematic diagram of a prior art tilting pad thrust bearing, fig. 2: 3 is tilting pad thrust bearing rotor, 4 is bearing installation base body, 5 is tilting pad ball top, 6 is tilting pad.

Fig. 3 is a schematic structural diagram of the flexible thrust bearing of the invention, and in fig. 3: 7 is a rotor, 8 is a bearing bush body, 9 is a high-pressure oil hole, and 10 is a bearing bush sleeve.

Detailed Description

The present invention will be described in detail with reference to the accompanying drawings and specific embodiments.

Referring to fig. 3, the flexible thrust bearing comprises a bearing bush body 8 and a bearing bush sleeve 10, wherein a high-pressure oil hole 9 is formed in the bearing bush body 8, the outer circle of the bearing bush body 8 is an outer spherical surface, the inner hole of the bearing bush sleeve 10 is an inner spherical surface, and the matching surface of the bearing bush sleeve 10 and the bearing bush body 8 is a spherical surface, so that a universal joint is formed, and after the bearing bush sleeve 10 is installed in a box body, the bearing bush body 8 can rotate freely in the bearing bush sleeve to conform to errors of installation of a rotor and deformation and bending in the operation process.

The bearing bush body 8 and the bearing bush sleeve 10 are of split structures, and installation is convenient.

The utility model discloses a theory of operation:

after assembly, when the gap between the working surface of the bearing bush body 8 and the shaft shoulder surface of the rotor 7 is not uniform due to assembly error, sudden stress of the rotor 7 and deformation of the rotor 7 due to long-term operation, the bearing bush body 8 can be rotated and adjusted at any time in the bearing bush sleeve 10 under the pressure of an oil film entering between the rotor 7 and the bearing bush body 8 through the high-pressure oil hole 9 until the gap is uniform. In order to facilitate the installation of the shaft, the bearing bush body 8 and the bearing bush sleeve 10 are both of a split structure and are connected with the pin through a screw.

Since the flexible thrust bearing ensures a uniform gap between the bearing surface and the rotor at any time, the bushing block 8 is required to be able to move flexibly in the bushing sleeve 10. The spherical clearance between the bearing bush body 8 and the bearing bush sleeve 10 is 0.03-0.06mm, the spherical roughness is Ra0.8, no scratch exists, and the bearing bush body and the bearing bush sleeve need to be colored and checked when in processing: it is required that the right upper 90 deg. range is not contacted or slightly contacted, and the contact area in the other 270 deg. range should reach 80%.

For assembly errors, the rotor is stressed suddenly or deformed due to long-term operation, and the gap between the working surface of the bearing bush body and the shaft shoulder surface of the rotor is not uniform. Under the action of oil film pressure, the bearing bush body 8 of the flexible thrust bearing can automatically rotate and adjust in the bearing bush sleeve 10 immediately until the gap between the working surface of the bearing bush body and the shaft shoulder surface of the rotor is uniform, and the pressure is stable.

The utility model discloses require to carry out contrast test according to the clearance of the axle bush body with the axle bush cover sphere, first group's clearance is 0.02mm, and second group's clearance is 0.04mm, and second group's clearance is 0.08mm, and concrete experiment parameter and result are shown in the following table.

The utility model discloses flexible footstep bearing has used the principle of universal joint, designs into the sphere to the axle bush excircle that has the working thrust face, forms the universal joint with the axle bush cover, and the axle bush body can be along with the installation error of rotor and the slope in the use or the degree of warp a little carries out the suitability adjustment, makes load evenly distributed on the thrust tile working face. The key process parameters are the profile tolerance of the spherical surface and the requirement of the gap between the bearing bush body and the spherical surface of the bearing bush sleeve to be 0.03-0.06mm, the higher the precision of the profile tolerance is, the better the flexibility of the universal joint is, the smaller the gap can influence the flexibility of the adjustment of the bearing bush body in the bearing bush sleeve, and the larger the gap can cause the overlarge vibration of the rotor.

Claims

1. The flexible thrust bearing comprises a bearing bush body (8) and a bearing bush sleeve (10), wherein a high-pressure oil hole (9) is formed in the bearing bush body (8), and the flexible thrust bearing is characterized in that the outer circle of the bearing bush body (8) is an outer spherical surface, the inner hole of the bearing bush sleeve (10) is an inner spherical surface, and the matching surface of the bearing bush sleeve (10) and the bearing bush body (8) is a spherical surface, so that a universal joint is formed.

2. Flexible thrust bearing according to claim 1, characterized in that the spherical clearance between the bush body (8) and the bush housing (10) is 0.03-0.06mm and the spherical roughness is Ra0.8.

3. The flexible thrust bearing of claim 1, wherein said bearing shoe (8) thrust face is compounded with a layer of bearing alloy having n equal evenly distributed oil wedge surfaces to ensure the formation of an oil film layer between the alloy surface and the shoulder when the rotor is started.

4. Flexible thrust bearing according to claim 1, characterized in that the bush body (8) and the bush housing (10) are of split construction.