CN112448523A

CN112448523A - Motor bearing modular structure easy to replace

Info

Publication number: CN112448523A
Application number: CN202011335452.7A
Authority: CN
Inventors: 刘瑞强; 高尉; 张莉; 罗东
Original assignee: CRRC Yongji Electric Co Ltd
Current assignee: CRRC Yongji Electric Co Ltd
Priority date: 2020-11-25
Filing date: 2020-11-25
Publication date: 2021-03-05

Abstract

The invention relates to a motor bearing structure, in particular to an easily-replaced motor bearing modular structure. The utility model provides an easy motor bearing modular structure who changes, includes end cover, outer bearing cap, interior bearing cap and bearing, and end cover, outer bearing cap, interior bearing cap, bearing form a module through first bolted connection, and whole module passes through the second bolt and is connected fixedly with the casing. The bearing isolator is arranged on the rotating shaft and forms a sealing structure of a bearing chamber with the outer bearing cover to prevent bearing lubricating grease from overflowing. The outer edge of the supporting frame is fixed on the shell in an interference fit mode, and the inner edge of the supporting frame is in clearance fit with the rotating shaft. In order to simplify the workload of the motor when the bearing is replaced, the invention designs the motor bearing modular structure which is easy to replace, the motor bearing can be integrally disassembled and assembled when being replaced, the process of replacing the motor bearing is simplified, and the troubleshooting and the maintenance of the fault can be completed in a shorter time.

Description

Motor bearing modular structure easy to replace

Technical Field

The invention relates to a motor bearing structure, in particular to an easily-replaced motor bearing modular structure.

Background

Since this century, scientific technology has developed very rapidly worldwide, and the development of scientific technology has directly or indirectly promoted the high-speed development of various industries, especially the mechanical equipment industry, and is still the trend of breaking bamboo in modern science and technology, and the hardware and software performance has been greatly improved and optimized, and the production equipment is rapidly moving towards the direction of high integration, precision, rapidness and intelligence. Therefore, modern mechanical equipment generally tends to be precise and complicated, the linkage relationship among various components is tighter, and the whole system forms an organic whole with different functions through the complicated connection relationship.

The motor is an important driving force in modern industrial processes, the composition of the motor comprises various parts, and the motor is used as an extremely important driving device in a wide range, so that the working environment of the motor is also various, and the possibility of the motor failure is high. Generally, when a motor fails, production activities are stopped, and huge economic losses are caused, so that the motor is required to have higher reliability and easy maintainability after the motor fails on the premise of ensuring the normal working capacity of the motor during motor design.

The bearing is one of the core components of the motor system, has the function of reducing friction loss between mechanical components, is a very standardized precise mechanical device, and has the advantages of small friction, easy assembly and use, high efficiency and the like. However, the bearing serves as a support part while serving as a connection part of the rotating part, and thus has a load bearing capability. The bearing is inevitably influenced by a series of physical actions such as mechanical abrasion, stress and the like in the normal use process, and the bearing is continuously deformed and corroded in the daily and monthly accumulated use process, so that the operation process of the bearing is changed. And in the production process, due to the reasons of technical imperfection, improper operation of technicians and the like, artificial bearing damage can also occur, and the accumulation of the damage inevitably causes the damage of the bearing. The category of bearing failure is also shown as part of the several defect forms described above. Bearings are also the most susceptible motor elements to wear, and over 40% of motor failures occur in the bearing section. Once a motor bearing breaks down, the normal operation of the motor is directly influenced, so that the motor bearing is timely and conveniently replaced after breaking down, and the structure which is favorable for replacing the motor bearing is required to be considered in great importance when the motor structure is designed.

The design scheme of the original motor bearing structure is shown in figure 1, and the structure is characterized in that:

a. item 1 (housing) is connected with item 2 (end cap) by item 8 (second bolt);

b. item 2 (end cap), item 3 (outer bearing cap), item 4 (inner bearing cap) are connected by item 7 (first bolt);

c. the inner ring of the item 5 (bearing) is directly contacted with the item 6 (rotating shaft) and rotates along with the rotating shaft, and the outer ring is fixed on the end cover;

d. item 3 (outer bearing cap), item 4 (inner bearing cap) limit the axial movement of item 5 (bearing);

e. item 9 (oil seal) is fixed on the rotating shaft through interference fit, and has a clearance with item 3 (outer bearing cover) for preventing lubricating grease from overflowing;

f. there are gaps between item 3 (outer bearing cap), item 4 (inner bearing cap) and item 6 (rotating shaft), not in direct contact.

The original motor bearing structure has the following defects:

a. when the bearing needs to be replaced, the item 2 (end cover), the item 3 (outer bearing cover), the item 4 (inner bearing cover), the item 5 (bearing), the item 7 (first bolt), the item 9 (oil seal) and the item 8 (second bolt) need to be disassembled and assembled for many times; (ii) a

b. The disassembly and assembly steps are complex and need to be carried out according to a certain sequence, and any part cannot be assembled normally and cannot be subjected to subsequent operation;

c. when item 2 (end cap) and item 5 (bearing) are disassembled, item 6 (rotating shaft) and the components thereon will lose support on the side, which may cause excessive deflection due to gravity, affecting the assembly accuracy;

d. the time cost is large, and the economic benefit is directly influenced.

Disclosure of Invention

The invention provides a motor bearing modular structure easy to replace, which can realize the replacement of a motor bearing without disassembling a motor in a large scale and has the characteristics of modularization and rapidness.

The invention is realized by adopting the following technical scheme: the utility model provides an easy motor bearing modular structure who changes, includes end cover, outer bearing cap, interior bearing cap and bearing, and end cover, outer bearing cap, interior bearing cap, bearing form a module through first bolted connection.

Foretell motor bearing modular structure who easily changes, whole module is connected fixedly through second bolt and casing.

The motor bearing modular structure easy to replace further comprises a bearing isolator, wherein the bearing isolator is mounted on the rotating shaft and forms a sealing structure of the bearing chamber with the outer bearing cover, and bearing lubricating grease is prevented from overflowing.

The motor bearing modular structure easy to replace further comprises a support frame, the outer edge of the support frame is fixed on the shell in an interference fit mode, and the inner edge of the support frame is in clearance fit with the rotating shaft. When the support frame is used for replacing a motor bearing, the support frame plays a supporting role in the rotor assembly, and the phenomenon that the installation of the modularized assembly body is influenced by radial deviation of the rotating shaft is avoided.

When the motor bearing is replaced, the method comprises the following steps:

a. unscrewing and dismounting the second bolt;

b. removing the whole module from the rotating shaft along the axial direction;

c. loosening and dismounting the first bolt to disassemble the module;

d. taking out the damaged bearing and replacing the damaged bearing with a new one;

e. assembling the outer bearing cover with the end cover;

f. the bearing is arranged in a bearing chamber of the end cover, and axial positioning is carried out through a boss of the outer bearing cover;

g. assembling an inner bearing cover with the assembly body;

h. connecting the assembly bodies into a module through a first bolt;

i. and the module is fixed on the shell through a second bolt.

The motor bearing modular structure easy to replace is characterized in that the bearing isolator is taken out before the motor bearing module is disassembled.

In the motor bearing modular structure easy to replace, the bearing isolator is axially positioned by the boss on the inner edge of the outer bearing cover during installation.

In the motor bearing modular structure easy to replace, the support frame is axially positioned through the boss on the inner edge of the shell during installation.

The technical scheme of the invention has the following beneficial effects:

in order to simplify the workload of the motor when the bearing is replaced, the invention designs the motor bearing modular structure which is easy to replace, the motor bearing can be integrally disassembled and assembled when being replaced, the process of replacing the motor bearing is simplified, and the troubleshooting and the maintenance of the fault can be completed in a shorter time. In order to prevent the radial offset of the rotating shaft with one end of the module being out of support after the module is disassembled, a support frame is added for radial positioning of the rotating shaft, so that the motor bearing modularized assembly body can be quickly and accurately installed on the rotating shaft without large-scale disassembly of the motor, the working time is saved, and the improvement of the working efficiency and the economic benefit is facilitated.

Drawings

Fig. 1 is a schematic view of an original motor bearing structure.

Fig. 2 is a schematic view of the installation of the modular motor bearing of the present invention.

Fig. 3 is a schematic structural view of a modular motor bearing according to the present invention.

FIG. 4 is a schematic view of a bearing isolator assembly.

Fig. 5 is an assembly view of the support frame.

In the figure: the bearing comprises a shell 1, an end cover 2, an outer bearing cover 3, an inner bearing cover 4, a bearing 5, a rotating shaft 6, a first bolt 7, a second bolt 8, an oil seal 9, a bearing isolator 10 and a support frame 11.

Detailed Description

The invention designs a motor bearing modular structure easy to replace, which aims to improve the working efficiency of replacing a motor bearing, and comprises the following specific contents:

a. item 2 (end cap), item 3 (outer bearing cap), item 4 (inner bearing cap), item 5 (bearing) are connected through item 7 (first bolt) to form a module, so that the modular disassembly and assembly are convenient when the bearing is replaced;

b. the item 10 (bearing isolator) is added and is arranged on the item 6 (rotating shaft), and the sealing structure of the bearing chamber is formed by axial positioning through the lug boss on the inner edge of the item 3 (outer bearing cover) and the lug boss, so that the bearing lubricating grease is prevented from overflowing;

c. the item 11 (supporting frame) is added, the supporting frame is disc-shaped, is positioned at the inner side of the bearing module, is provided with a shaft hole at the middle position, is fixed on the item 1 (casing) at the outer edge through interference fit and is axially positioned through a lug boss on the inner edge of the item 1 (casing), and is in clearance fit with the item 6 (rotating shaft), and the item 11 (supporting frame) and the item 6 (rotating shaft) are not directly contacted;

d. the whole module is connected and fixed with the casing through the top 8 (bolt 2).

The modular structure is shown in fig. 3, and when the motor bearing is replaced, the method comprises the following steps:

a. unscrew and remove item 8 (second bolt);

b. the entire module is removed axially from item 6 (spindle);

c. the module can be disassembled by unscrewing and detaching the item 7 (the first bolt);

d. taking out the bearing needing to be damaged and replacing the bearing with a new one;

e. assembling item 3 (outer bearing cap) with item 2 (end cap);

f. the item 5 (bearing) is installed in the bearing chamber of the item 2 (end cover) and is axially positioned by the lug boss of the item 3 (outer bearing cover);

g. assembling item 4 (inner bearing cap) with the above assembly;

h. connecting the assembly bodies to form a module by means of item 7 (first bolt);

i. the module is fixed to the chassis by item 8 (second bolt).

The assembly relationship between item 9 (bearing isolator), item 6 (rotating shaft) and item 3 (outer bearing cover) is shown in fig. 4, and the bearing isolator should be taken out before the motor bearing module is disassembled.

Fig. 5 is an assembly diagram of item 10 (support frame), item 1 (casing), item 6 (pivot), and item 10 (support frame) plays a supporting role to the rotor assembly when being used for changing the motor bearing, avoids item 6 (pivot) to produce radial offset and influences the installation of the modular assembly body, and mainly has the following characteristics:

a. the outer edge of the item 10 (support frame) is in direct contact with the item 1 (shell) through interference fit;

b. the boss on the inner edge of the item 1 (casing) is used for axially positioning the item 10 (support frame);

c. a gap exists between the inner edge of the item 10 (supporting frame) and the item 6 (rotating shaft), and the rotor assembly is supported;

d. the item 10 (support frame) is not disassembled in the process of replacing the motor bearing.

Claims

1. The utility model provides an easy motor bearing modular structure who changes, includes end cover (2), outer bearing cap (3), interior bearing cap (4) and bearing (5), its characterized in that: the end cover (2), the outer bearing cover (3), the inner bearing cover (4) and the bearing (5) are connected through a first bolt (7) to form a module.

2. An easily replaceable motor bearing modular structure as claimed in claim 1, wherein: the whole module is fixedly connected with the machine shell through a second bolt (8).

3. An easily replaceable motor bearing modular structure as claimed in claim 2, wherein: the bearing isolation device (10) is arranged on the rotating shaft (6) and forms a sealing structure of a bearing chamber with the outer bearing cover (3).

4. An easily replaceable motor bearing modular structure as claimed in claim 3, wherein: the motor is characterized by further comprising a support frame (11), wherein the outer edge of the support frame (11) is fixed on the shell (1) in an interference fit mode, and the inner edge of the support frame (11) is in clearance fit with the rotating shaft (6).

5. An easily replaceable motor bearing modular structure as claimed in claim 4, wherein: when the motor bearing is replaced, the method comprises the following steps:

a. unscrewing and detaching the second bolt (8);

b. the whole module is axially removed from the rotating shaft (6);

c. the module can be disassembled by unscrewing and dismounting the first bolt (7);

e. assembling the outer bearing cover (3) and the end cover (2);

f. the bearing (5) is arranged in a bearing chamber of the end cover (2) and is axially positioned through a boss of the outer bearing cover (3);

g. assembling an inner bearing cover (4) with the assembly body;

h. the assembly bodies are connected into a module through a first bolt (7);

i. the module is fixed on the machine shell through a second bolt (8).

6. An easily replaceable motor bearing modular structure as claimed in claim 5, wherein: before the motor bearing module is disassembled, the bearing isolator (10) is taken out.

7. An easily replaceable motor bearing modular structure as claimed in claim 3 or 4 or 5 or 6 wherein: the bearing isolator (10) is axially positioned by a lug boss on the inner edge of the outer bearing cover (3) when being installed.

8. An easily replaceable motor bearing modular structure as claimed in claim 4 or 5 or 6 wherein: the supporting frame (11) is axially positioned by a boss on the inner edge of the machine shell (1) during installation.