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The main purpose of bearing lubrication is to reduce friction and wear of each element. Lubricants perform this function by separating rolling and sliding surfaces with a very thin film of oil. Bearing performance and service life is largely dependent on the suitability of the lubricating system and lubricant to the application. Functions of lubrication in rolling contact bearings are
(1) Reduction of friction and wear, reduce the running noise.
(2) Removal of friction heat
(3) Prolonged bearing life
(4) Prevention of rust
(5) Prevention of foreign material from entering the bearing
Lubrication method for bearings can be roughly divided into grease and oil lubrication, grease lubrication is the most widely used lubricant for rolling bearings, It is used a bearing that is shields or seals on both sides, or if using an unsealed bearing
Lubricating grease consist of a mineral or synthetic oil with thickener, the thickners are usually metallic soaps, or other additives also be included to enhance certain properties of the grease. When selecting grease, must consider the the consistency, viscosity of the base oil, operating temperature range, compressive load ,speed¡
Following are common grease type, properties and characteristics
| Maker | NO. | Brand | Base oil | Soup | Temperature range | Characteristics |
| KYODO YUSHI | 1 | Multemp SRL | Polyol ester+ Diester | Li | -50~+150 | Excellent noise suppressant property and extended performance life |
| 2 | Multemp SM-B | Synthetic hydrocarbon | Urea | -40~+200 | Long service life under high temperature, Excellent low-temperatureperformance, has high-speed operation, low noise property | |
| 3 | Raremax SUPER N | mineral oil+Synthetic hydrocarbon | Urea | -40~+180 | Long service life under high temperature,
Excellent low- temperature performance, low noise property |
|
| 4 | Multemp PS2 | Diester+Synthetic hydrocarbon | Li | -50~+130 | Excellent low-temperature performance, has outstanding noise suppressant property | |
| 5 | Multemp SRH | Polyol ester | Li | -40~+150 | Excellent noise suppressant property and extended performance life | |
| 6 | Multemp SRM | Polyol ester | Li | -50~+150 | Low noise long life and low torque resistance to chemical attack | |
| 7 | Multemp ET-K | Synthetic easter +Polyol ester | Aromatic double urine |
-40~+200 | Has more extended life under a high operating temperature condition. | |
| KLUBER | 8 | BQH72-102 | ester | Urea | -40~+180 | Long service life under high temperature,
Excellent low-temperature performance,
has high-speed operation, low noise property |
| 9 | BEP72-82 | ester | Urea | -40~+180 | Low noise,Excellent low temperature performance, | |
| 10 | ASONIC GLY32 | ester | Li | -50~+140 | Low noise, long life and low torque | |
| 11 | ASONIC Q74-73 | ester | Urea | -40~+160 | Low noise,long life and low torque | |
| long life and low torque | ||||||
| 13 | Isoflex TOPAS NB 52 | mineral grease +polyesters | Barium complex soap |
-50~+120 | load bearing,high speed | |
| 14 | PETAMO GHY133 | mineral grease+ Synthetic hydrocarbon | Urea | -30~+160 | Long service life under high | |
| temperature | ||||||
| 15 | BE 41-542 | Mineral grease | Li | -20~+140 | High load bearing,Excellent | |
| Bearing protection | ||||||
| 16 | BE 31-502 | Mineral grease | Urea | -10~+140 | high viscosity and high load | |
| SHELL | 17 | Alvania 2 | Mineral grease | Li | -25~+120 | Long life and high temperature. |
| 18 | RLQ #2 | Mineral grease | Li | -20~+120 | Long life and high temperature. | |
| 19 | RL2 | Mineral grease | Li | -20~+120 | Long life and high temperature. | |
| 20 | RL3 | Mineral grease | Li | -30~+120 | Long life and high temperature. | |
| EXXON MOBIL | 21 | Polyrex EM | Mineral grease | Urea | -29~+177 | long life |
| 22 | Unirex N3 | Mineral grease | Li | -40~+190 | long life,resistance to chemical attack waterproof | |
| 23 | BEACON325 | Synthetic grease | Li | -54~+150 | High speed and low noise | |
| 24 | Unirex N2 | Mineral grease | Li | -40~+190 | long life,resistance to chemical attack waterproof | |
| 25 | Mobil 28 | Synthetic hydrocarbon | Micro adhesive | -60~+177 | High temperature stability | |
| Cosmo | 26 | EMQ2(SBR) | Mineral grease | Li | -30~+130 | long life and low noise |
| 27 | PNG | Mineral grease | Li | -30~+130 | long life and low noise | |
| CHEVRON | 28 | SRI-2 | ISOSYN Mineral grease | Urea | -30~+150 | waterproof |
| Lubcon | 29 | N2 | ester | Urea | -40~+180 | High temperature and low noise |
| DUPONT | 30 | Krytox 240AC | Fluorinated grease (PFPE/PFPAE) |
PTFE | -34~+288 | High temperature stability with good lubricity properties |
| Jinzhi | 31 | Hangu 2 | Mineral grease | Li | -20~+120 | Low noise |
| 32 | HTHS | Mineral grease | ¡¡ | -40~+180 | High speed ,low temperature,low torque and low noise | |