How to improve the effect of the bearing grease and life?

Over the past 30 years, people pay increasingly attention to energy conservation and emissions reduction in order to improve the efficiency of passenger cars and commercial vehicles. The government enacted laws to car manufacturers of engine and transmission system, than in the 1980 s, efficiency improved significantly. However, the vast majority of people look at the engine and transmission system, but ignored the other parts. Passenger car or light truck used lubricating parts of more than 50 kinds of grease. Although most of the grease work efficiency there is no direct relationship with the car, but the wheel, assistant bearing, steering, gearbox parts after using the grease can improve efficiency. Another important factor that influence efficiency of work is bearing in the smaller volume of modern machines. Compared with the 1950 s, with the same bearing capacity of bearing size has fallen by almost 70%. Grease to the bearing life can not be ignored. Friction loss of rolling bearing is lubricated by grease energy loss is the main source of the sealing surface friction stir, grease and thick body rolling friction. Rolling friction exists mainly in deep groove ball bearing raceway, is made and the groove on the edge of the sliding and rolling movement. Ball sliding friction with the bearing cover, but the impact on the efficiency of the insignificant. Deep groove ball bearing is mainly used for electric motors, drive shaft bracket and accessories parts, not for wheel bearing. Because it can't bear radial and axial load at the same time. Wheel bearings are generally used in North America cone roller bearing, and in other markets such as Europe using the angular contact bearings. Cone roller bearings, angular contact bearing friction loss is mainly composed of ball bearing and the bearing cover and the bearing cage and sliding movement of raceway. Sliding speed, the type of lubricating oil, contact situation varies between cars, so the energy loss and efficiency are also different. Sliding friction coefficient of an order of magnitude larger than the coefficient of rolling friction. Thus reduced sliding, the friction loss also fell. Reduce the sliding method is to reduce the friction coefficient of lubricant. This is why since the 1920 s, people began to research how to under the boundary lubrication, friction modifier is used to reduce friction. Friction test many standard test can detect the friction of the grease. With four goals in sliding friction and wear testing machine before, but this kind of machine is a serious problem, which is the bearing will affect the friction values, other machine installation is air bearing or cone roller bearing. Installation of cone roller bearing machine has higher motion resistance, so its data without interference. R2F, FE8 and ball disk friction testing machine test data is more accurate. For a variety of complex lithium grease and urea base thickened grease was tested. The result shows that only organic molybdenum compounds - — MoDTC and friction coefficient of phosphorus molybdenum to as low as zero. 08 here, at the same time, also found that the friction improver need use can play a role in combination with other additives, such as the second generation of zinc phosphate, sulfur or for the whole of sulfide extreme pressure agent in synthetic grease etc. Can be concluded from the test, two kinds of molybdenum compounds respectively when mixed with two kinds of thickener is different, the effect of a more optimized formula study is needed. By continuing to test the additive and the molybdenum compound with lithium, lithium composite base, urea grease, the effect of the 10 kinds of mixture mixed found a variety of mixed can reduce the friction coefficient of lithium grease to zero. 06, add MoDTC can improve the running-in characteristics, but also make the maintenance difficulty and cost greatly increased. Design factors while the molybdenum compounds, organic friction improver, abrasion and other functional additives is very important, but it looks from the experiment, to comprehensively improve the effect of grease, people still need to consider other factors, including the traction, film thickness, and the rheological properties of the grease, consistency, filling volume. Traction: the traction force is a measure of the internal friction lubricating oil. Generally speaking, the traction coefficient is smaller, less heat production will be. However, to determine the traction coefficient of the grease is very difficult. First of all to control temperature, grease is insulation material, in the experiment, control the temperature of the grease is not too easy. The second is the manual operation. In traction and light flow dynamic experiment, it is difficult for us to make grease in the bearing. After experiment grease is pushed away from the contact area cannot be returned to its place. Therefore need to use oil scraper artificial put grease on back. This manual operation steps need to be further studied. Oil film thickness: people used to think that thickener has nothing to do with lubrication. However, experiments show that compared with the crude oil, grease to form thicker film. Under the low grease form of oil film thicker than expected. This finding is helpful to research production better energy saving effect of grease. A: bearing crack damage is how cause? Cause after? A: the hybrid ceramic bearing six big advantage!