The installation and use process of motor bearings is often overlooked, which can lead to various bearing problems such as bearing noise, heat, running circle, holding shaft, and other failures.
To provide some assistance in addressing these issues, We has summarized some of the unnoticed problems related to the bearing installation process.
Bearing storage requirements:
Bearings should not be stored directly on the ground, should be kept at least 30cm above the ground, and should be protected from direct light and cold walls.
To prevent rusting, bearings should be stored in an environment with a temperature of around 20°C and a humidity of no more than 65%. It is important to avoid placing bearings in acidic air.
Before assembly, bearings should be wiped of iron filings and dust from the mating shaft and housing to prevent rubbish from entering the inner part of the bearing and the mating part, which is a common cause of failure.
Precautions when using bearings:
Bearings should be installed in a dry and clean environment.
Preparation work should be done before installation, including using different installation methods based on bearing size and application environment, preparing the necessary parts, tools, and equipment for installation, cleaning all parts to be installed, and checking the size and shape accuracy of all parts according to drawings.
It is important not to unpack the bearings before installation preparation work is finished to prevent contamination.
When picking up bearings directly by hand, it is important to wash away sweat on hands and apply high-quality mineral oil before operation, especially during the rainy season and summer when rust prevention is crucial.
It should be noted that the corrosive effect produced by sweat differs for each person.
Some people’s sweat is highly corrosive and can cause obvious rust in just 1-2 hours after contacting the bearings, while others may not show rust. Professional bearing manufacturing companies test employees’ hand sweat before starting work.
Special tools should be used as much as possible, and cloth and short fiber materials should be avoided.
Soft metal material should be used as an assembly sleeve (copper or soft steel) when pressure assembly is used in the bearing inner or outer ring end face.
Heating the bearing or bearing seat to use thermal expansion to change the tight fit into a loose fit installation method is a common and labor-saving installation method.
However, it is important to hold the frame bearing heating process clean, and heating temperature should generally not exceed 120°C.
After installation, the bearing should be checked to ensure it is installed in place, rotates flexibly, and there is no stalling phenomenon. Improper bearing installation can cause the bearing temperature to rise rapidly and result in damage or even a major accident such as bearing jamming and fracture.
When installing cylindrical roller bearings, for example, NU structure, grease should be applied above the bearing compound circle and on the inner ring raceway surface to reduce damage caused by friction between the collar and roller during installation and assembly.
When filling the grease on top of the retaining ring, the grease should gather in the retaining ring groove against the outer raceway of the bearing as much as possible so that the grease can circulate normally under suitable grease filling amounts.
When the bearing and big end cover are about to be installed in place (when the nut is not tightened), rotate the rotor to allow the bearing to self-adjust to its proper position and to help form a lubricating oil film inside the bearing.
By continuing to learn about this topic, get more information about electric motors, please contact the professional manufacturer as below;
Professional electric motor manufacturers in China
China is a major player in the global electric motor industry, with numerous manufacturers producing high-quality and cost-effective motors for various applications
Dongchun motor offers a wide range of electric motors that are designed and built to meet international standards and comply with the specific requirements of their clients.
The company has an extensive product portfolio that includes single-phase and three-phase AC motors, brake motors, gear motors, and special motors for customized applications.
