Which grease should be selected for high-speed bearings? Today, the manufacturer of Jiurun special grease will share with you:

　　The high speed of the bearing will cause the following problems:

　　1. The bearing temperature is relatively high due to the high rotating belt and more frictional heat generation. The base oil of the grease tends to evaporate and dry, and the oxidation is accelerated, which increases the deterioration of the grease and the corrosion of the bearing surface. In addition, the oil film becomes smaller, resulting in worse lubrication problems, such as increased bearing vibration and noise.

　　2. Due to the high rotational speed, the centrifugal force of the bearing increases, and the grease is easily thrown out of the bearing. Centrifugal force will also cause changes in the base oil content of the grease attached to various parts of the bearing. If this change exceeds a certain limit, poor lubrication can result. If the bearing is in good condition for continuous rotation, it will make a low hum or hum. High-pitched hissing, squeaking, and other irregular sounds are usually a sign that the bearing is in poor continuous rotation. A sharp squeak may be caused by improper lubrication. Improper bearing clearance can also cause metal noise. Indentations in the bearing outer race track cause vibrations and produce a smooth, crisp sound. If there is intermittent noise, the rolling parts may be damaged. This sound is produced when a damaged surface tumbles, usually a hissing sound if there is contamination in the bearing. Severe bearing damage can produce irregular sounds. If it is caused by knocking the scar during installation, there will also be noise, and that noise will vary with the speed of the bearing.

　　In order to adapt the grease to the characteristics of high-speed bearings, the performance requirements of the grease are as follows:

　　(1)To minimize bearing temperature rise, so-called "groove" greases are often used.

　　(2)The friction coefficient of the grease is required to be small so that the frictional resistance can be reduced as much as possible, and the heat generation of the bearing can be reduced.

　　(3)Greases are required to have good mechanical stability.

　　(4)The base oil viscosity coefficient of the grease is required not to be too large. If the viscosity is too high, the frictional resistance will increase, which can easily cause heat.

　　(5)Greases are required to have good colloidal stability.

　　(6)The grease must have less mechanical impurities. Bearing life is affected by mechanical impurities that increase bearing vibration and noise.

　　1、Grease should be used at least 20-30 degrees below its dripping temperature. When the operating temperature is high, the grease with good oxidation resistance, low evaporation loss and high dropping point should be selected. When operating temperatures are low, greases with low starting torque and similar viscosity should be selected, such as those based on synthetic oils.

　　2、The selected grease should be adapted to the speed of use of the friction pair to be lubricated. When driving at high speed, a low viscosity base oil with higher permeability should be selected. For low-speed greases, a high-penetration grade made from a high-viscosity base oil should be selected.

　　3、The selected grease should be suitable for the purpose of use. The grease used for lubrication must be selected according to the type of friction pair, working conditions, working conditions, environmental conditions and the way the grease is supplied; for a protective grease, it should be able to effectively protect the metal from corrosion. For example, to protect parts in contact with seawater, aluminum-based greases with strong adhesion and water resistance should be selected; solid hydrocarbon-thickened, high-viscosity greases should be used for general protection. For sealing grease, attention should be paid to its resistance to the solvent of the medium being sealed.