The developing course of rolling bearing ( 1)

The beginning of the birth of human, face an inevitable problems in carrying heavy things. To this end, the earliest ancestors had used 'slip', cylindrical stick performed dynamic thinking. 40 - b. c. 30 century, invented the use of dynamic motion of the wheel, and between vehicles to the world, which greatly improves the speed of the mobile, history and civilization of human society has a very important ah. Study of rolling friction, originating in Leonard da VINC1. In 1955, TABOR with the hydraulic diameter of steel ball was used to study completely ruled out interface slip after rolling friction, make clear the internal friction materials is the nature of the cause of the rolling friction. In the earliest text of hydraulic bearing is 1772 VARLO axle production of ball bearings. In the actual use of the internal of the rolling bearing, in addition to the roller rolling movement, also occur between the rolling element and cage slip moving sports, ball screw roller sliding motion, the torsion of sliding motion and the sliding motion between liquid and guide the guard and so on. Dynamic bearing industry and technology is at the end of the 19th century to the beginning of the 20th century is given priority to with Europe and the United States formed and developed. O the main bearing enterprise, founded in 1889 to 1909, Europe and the United States and it is the formation of civil automobile industry together. Japanese companies are mainly in the bearing was established in 1916 to 1928, east of the first world war, the optimal spare Japanese carry out the policy of new army big arms build-up. As ships, aircraft, tanks, vehicles and other military equipment development, formed the rolling bearing industry of Japan. As for prompting rolling bearing industry to form social demand, Europe and the United States and Japan is not the same. Japan bearing industrial output in 1944 near the end of the second world war reached 35 million sets of record, by air strikes and a fall thousand zhangs. The second half of the 20th century, Europe and the United States bearing products research and development in the circumstances of the cold war, focused on military purposes to develop the transportation, manufacturing, household, audio-visual and other home mechanical bearings for the purpose of the rolling bearing technology in the world. In terms of theory, from the 1950 s began to study the characteristics and the causes of vibration and noise of rolling bearings, and figure out the frequency of vibration and noise of rolling bearings are mainly from to the vibration of the bearing is a bearing outer ring or elastomer system, is composed of a variety of fixed frequency of vibration, and also find out the rolling body and inner and outer ring groove ( Roll) Ripples and the relationship between the vibration frequency on bearing products. The results of low vibration, low noise rolling bearing design and production of the gong, the result makes low noise rolling bearing friction torque and fluctuations are small bearings, fundamentally improve the friction performance of the bearing.