CN-121976930-A - Integrated sliding main bearing system and maintenance method thereof

CN121976930ACN 121976930 ACN121976930 ACN 121976930ACN-121976930-A

Abstract

The invention discloses an integrated sliding main bearing system and a maintenance method thereof, wherein the integrated sliding main bearing system comprises a main shaft, a bearing seat, a radial bearing assembly, an axial sliding assembly and a gear box, the main shaft is arranged in an inner cavity of the bearing seat in a penetrating mode, the input end of the gear box is connected with the main shaft and the bearing seat respectively, the output end of the gear box is connected to a generator, the radial bearing assembly is detachably arranged on the front side and the rear side of the inner cavity of the bearing seat respectively and used for supporting the torque transmission and the radial limiting of the main shaft, and the axial sliding assembly is detachably arranged at the front end of the bearing seat and used for limiting the axial direction of the main shaft. The invention has the characteristics of compact structure, convenient disassembly and assembly, high maintenance efficiency and the like, integrates the main bearing, the thrust bearing and the gear box into a compact supporting unit, reduces independent supporting points, shortens the length of a shafting, and breaks the bottleneck of the bearing design of the ultra-large megawatt unit.

Inventors

OUYANG HUA
LIU BO
GAO NAN
CHEN RUI
YIN TIANJIN
DENG WENKAI
LI XIUZHEN
ZHOU WEI

Assignees

中车株洲电力机车研究所有限公司

Dates

Publication Date: 20260505
Application Date: 20260409

Claims (10)

1. The integrated sliding main bearing system is characterized by comprising a main shaft (1), a bearing seat (2), a radial bearing assembly, an axial sliding assembly and a gear box (9), wherein the main shaft (1) is arranged in an inner cavity of the bearing seat (2) in a penetrating mode, the input end of the gear box (9) is connected with the main shaft (1) and the bearing seat (2) respectively, and the output end of the gear box (9) is connected to a generator (10); The radial bearing assemblies are detachably arranged on the front side and the rear side of the inner cavity of the bearing seat (2) respectively and are used for supporting torque transmission and radial limiting of the main shaft (1); the axial sliding assembly is detachably arranged at the front end of the bearing seat (2) and used for limiting the axial direction of the main shaft (1).
2. An integrated sliding main bearing system according to claim 1, characterized in that the radial bearing assembly comprises a front radial bearing shell (3) and a rear radial bearing shell (4), the front radial bearing shell (3) being arranged in front of the inner cavity of the bearing housing (2), the rear radial bearing shell (4) being arranged in rear of the inner cavity of the bearing housing (2).
3. The integrated sliding main bearing system according to claim 2, wherein a plurality of maintenance holes (11) are uniformly distributed on the periphery of the bearing seat (2) along the axial direction, and the rear radial bearing bush (4) is dismounted at the rear part of the inner cavity of the bearing seat (2) through the maintenance holes (11).
4. The integrated sliding main bearing system according to claim 2, wherein the axial sliding assembly comprises an axial thrust plate (5), a first axial bearing bush (6), a second axial bearing bush (7) and a baffle plate (8), wherein the axial bearing bush (7), the axial thrust plate (5), the first axial bearing bush (6) and the baffle plate (8) are sequentially arranged from inside to outside at the front end of the bearing seat (2), the axial thrust plate (5) is circumferentially fixed on the periphery of the main shaft (1), and the first axial bearing bush (6), the second axial bearing bush (7) and the baffle plate (8) are all fixed at the end part of the bearing seat (2).
5. The integrated sliding main bearing system according to claim 4, wherein a plurality of through holes (15) are arranged on the upper portion of the baffle plate (8) side by side, a plurality of groups of threaded holes (13) are uniformly distributed on the front end of the bearing seat (2) along the circumferential direction, studs are screwed into the through holes (15) and the threaded holes (13), and the studs are locked through nuts, so that the baffle plate (8) and the bearing seat (2) are connected and fixed.
6. An integrated sliding main bearing system according to claim 5, characterized in that the lower part of the inner side of the baffle plate (8) is provided with an annular boss (14), the first axial bearing bush (6) is provided with a second annular groove (16), and the second annular groove (16) is nested on the annular boss (14) so as to fix the first axial bearing bush (6) on the inner side of the baffle plate (8).
7. The integrated sliding main bearing system according to claim 4, wherein a plurality of groups of first annular grooves (12) are uniformly distributed at the front end of the bearing seat (2) along the circumferential direction, and the first annular grooves (12) are used for installing the second axial bearing bush (7).
8. An integrated sliding main bearing system according to any one of claims 4 to 7, characterized in that the axial thrust plate (5) is a sector member, the axial thrust plate (5) being fixed to the outer periphery of the main shaft (1) by means of bolts.
9. A maintenance method, suitable for use in an integrated sliding main bearing system according to any one of claims 4 to 8, comprising the steps of replacing the front radial bearing shell (3), the axial thrust plate (5), the first axial bearing shell (6), the second axial bearing shell (7), the baffle (8): s1, removing a sealing device from the front of the bearing seat (2); S2, removing nuts for fixing the baffle plate (8), and removing the first axial bearing bush (6) after the baffle plate (8) is removed; s3, removing bolts between the axial thrust plate (5) and the main shaft (1), and removing the axial thrust plate (5); s4, removing the second axial bearing bush (7) and the front radial bearing bush (3); And S5, sequentially installing a newly replaced front radial bearing bush (3), a second axial bearing bush (7), an axial thrust plate (5), a first axial bearing bush (6) and a baffle plate (8).
10. The maintenance method according to claim 9, further comprising the step of replacing the rear radial bushing (4): Y1, removing a cover plate of a side part maintenance hole (11) of the bearing seat (2); y2, the rear radial bearing bush (4) is pulled out forwards along the axial direction through the maintenance hole (11); y3, feeding the newly replaced rear radial bearing bush (4) from the maintenance hole (11) axially backwards and installing the newly replaced rear radial bearing bush in place; and Y4, mounting the cover plate of the maintenance hole (11) back.

Description

Integrated sliding main bearing system and maintenance method thereof Technical Field The invention relates to the technical field of wind power generation equipment, in particular to an integrated sliding main bearing system and a maintenance method thereof. Background At present, technical bottlenecks in the large-scale process of the wind turbine generator are gradually revealed, and the technical bottlenecks are particularly reflected in the aspect of core transmission components. The geometry, overall mass and manufacturing costs of the main bearing system as an energy transmission hub all exhibit non-linear growth. When the rolling bearing for supporting the fan main shaft breaks through a diameter threshold value of 6m, the material consumption, the processing precision requirement and the assembly difficulty of the rolling bearing are increased in geometric progression. In view of the technical limitations of rolling bearings in ultra-high power units, the current industry technological lines began to tilt towards plain bearing solutions. Compared with the traditional rolling bearing, the sliding bearing is becoming a key technical breakthrough direction of a new generation of large megawatt fans by virtue of the excellent load distribution characteristic, the excellent impact load bearing capacity and the better power density. However, the industrial application of the technical route still needs to solve a plurality of engineering problems. In the existing sliding bearing system of the wind power transmission chain, the bearing bush bears bending moment to cause uneven deformation of the matching surface of the radial bearing bush, and the radial bearing bush and the thrust bearing bush are arranged at the hub end together, so that lubrication, maintenance, disassembly and replacement of the bearing bush are difficult to realize due to the fact that the radial bearing bush and the thrust bearing bush are limited by basic functions and structures of a fan. The axial bearing bush is difficult to maintain after sliding the bearing, the gearbox is required to be disassembled, the construction difficulty is high, and the radial bearing bush is complex in structural design and difficult to maintain. Disclosure of Invention The invention aims to solve the technical problem that the existing sliding bearing is difficult to maintain, and provides an integrated sliding main bearing system which is compact in structure, convenient to assemble and disassemble and beneficial to improving the maintenance efficiency and a maintenance method thereof. In order to solve the technical problems, the invention adopts the following technical scheme: The integrated sliding main bearing system comprises a main shaft, a bearing seat, a radial bearing assembly, an axial sliding assembly and a gear box, wherein the main shaft is arranged in an inner cavity of the bearing seat in a penetrating way, the input end of the gear box is respectively connected with the main shaft and the bearing seat, and the output end of the gear box is connected to a generator; The radial bearing assemblies are detachably arranged on the front side and the rear side of the inner cavity of the bearing seat respectively and used for supporting the torque transmission and radial limiting of the main shaft; The axial sliding assembly is detachably arranged at the front end of the bearing seat and used for limiting the axial direction of the main shaft. As a further improvement of the invention, the radial bearing assembly comprises a front radial bearing bush and a rear radial bearing bush, wherein the front radial bearing bush is arranged at the front part of the inner cavity of the bearing seat, and the rear radial bearing bush is arranged at the rear part of the inner cavity of the bearing seat. As a further improvement of the invention, a plurality of maintenance holes are uniformly distributed on the periphery of the bearing seat along the axial direction, and the rear radial bearing bush is dismounted at the rear part of the inner cavity of the bearing seat through the maintenance holes. The axial sliding assembly comprises an axial thrust plate, a first axial bearing bush, a second axial bearing bush and a baffle plate, wherein the second axial bearing bush, the axial thrust plate, the first axial bearing bush and the baffle plate are sequentially arranged at the front end of a bearing seat from inside to outside, the axial thrust plate is circumferentially fixed on the periphery of a main shaft, and the first axial shaft, the second axial bearing bush and the baffle plate are all fixed at the end part of the bearing seat. As a further improvement of the invention, a plurality of through holes are arranged on the upper part of the baffle plate side by side, a plurality of groups of threaded holes are uniformly distributed at the front end of the bearing seat along the circumferential direction, studs are screwed into the through holes and the