In motor equipment, bearings play an important role in supporting rotating parts and reducing friction and wear. The grease, as the “blood” of the bearing, has a crucial impact on the life and performance of the bearing. This paper discusses the selection and use of motor bearing grease from the aspects of the function of grease, the selection of suitable grease, the precautions of using grease, maintenance and replacement.
Grease is a semi-solid lubricant composed of base oil, thickener and additive, mainly used for lubrication and sealing of motor bearings. The role of grease mainly has the following points:
Reduce friction and wear: the grease can form an oil film to separate the bearing surface, thereby reducing the friction and wear of the bearing and extending the bearing life.
Cooling and cooling: the grease can take away the heat generated during the operation of the bearing, so as to play a cooling role and prevent the bearing from overheating damage.
Anti-rust and anti-corrosion: the additives contained in the grease can prevent the bearing surface from rust and corrosion, and protect the bearing from the external environment.
Sealing effect: the grease can form a sealing film on the bearing surface to prevent external dust, moisture and other impurities from entering the bearing inside, so as to maintain the normal operation of the bearing.
When choosing the right grease, the following factors need to be considered:
Working temperature: The working temperature range of the grease must cover the actual working temperature range of the bearing, otherwise the grease will become thin or hard and lose lubrication.
Speed: At different speeds, the friction and wear performance and cooling performance of the grease are also different. In general, at high speed, it is necessary to choose a low viscosity and high fluidity grease.
Working environment: The working environment where the motor is located, such as humidity, dust, etc., will also affect the choice of grease. In a humid environment, it is necessary to choose a grease with good waterproof performance.
Bearing type: Different types of bearings have different requirements for grease. For example, deep groove ball bearings need to choose a low viscosity, high flow grease, and tapered roller bearings need to choose a high viscosity, high bearing capacity grease.
When using grease, you need to pay attention to the following points:
Coating thickness: Apply grease to the right amount, too much or too little will affect the operation and life of the bearing. In general, the amount of coating to fill the bearing internal space 1/3~1/2 is appropriate.
Connection mode: The correct connection mode should be used when applying grease to avoid bringing impurities into the bearing. Generally, it can be applied by oil injection gun or hand.
Storage: Grease should be stored in a dry, clean environment, away from direct sunlight and high temperatures. The grease after opening should be used as soon as possible to avoid long-term exposure to the air leading to performance degradation.
In the process of use, it is necessary to check and maintain the motor bearings regularly to find and deal with potential problems in a timely manner. Here are some suggestions for maintenance and replacement:
Inspection cycle: It is generally recommended to check the motor bearing once a month, including the state of the grease and the operation of the bearing.
Replacement cycle: The replacement cycle of grease depends on its actual use and working environment. Generally speaking, the service life of the grease is about a few months to a year, and it needs to be replaced regularly to ensure the normal operation of the bearing.
Replacement method: When replacing the grease, it is necessary to completely clean the old grease, and then apply the new grease. It can be applied by grease gun or by hand.
Sealing ring replacement: When replacing the grease, it is also necessary to check the status of the sealing ring, if there is damage, it needs to be replaced in time to ensure the sealing performance of the bearing.
Choosing suitable motor bearing grease is of great significance to prolong bearing life and improve motor performance. When selecting and using grease, it is necessary to consider factors such as its working temperature, speed, working environment and bearing type, and pay attention to the correctness of the amount of use and application method. In the process of use, regular inspection and maintenance are also needed to find and deal with problems in time to ensure the normal operation of the motor.
