The early 20th century

 popular in the early 20th century in order to get a higher wear such layout functions, and soon replaced the new product. The early 20th century, 30 years, began to replace ball bearings rub graphite and bronze cylinder. The layout is not the type of bearing is firmly ...
Only the first clutch broke bearing graphite tube is placed in bronze or cast iron or forged steel trunnion, popular in the early 20th century in order to get a higher wear such layout functions, and soon replaced the new product. The early 20th century, 30 years, began to replace ball bearings rub graphite and bronze cylinder. The layout is not the type of bearing is firmly connected, but in order to be able to adapt to wear a request, contributed to the bearing and the clutch lever broke up with the tail, with the bearing surface of the friction material pads war has become a must. 30 years in the 20th century, the early, clutch wind turbine bearing exterior presents some of the more significant changes. Adoption group in the transmission output shaft guide bearings or bearing device needs a longer guide tube, difference soon after the completion of a double system of chaos. 40 years to 50 years age, the production system is an important improvement of the clutch broke the underlying purpose is to advance the size and low reliability. At this stage, the sealing material with the fat quality and great leap. Saponified grease relatively thick in terms of the growth decomposition thickener progressed significantly grease life. In addition, the new use of rubber decomposition, for example, polyacrylate, silicone resin and fluorine rubber, to enhance the temperature characteristics and chemical resistance sealed. All of these Received Date :2002 -09-10 identity are major advances in life expectancy of the bearings. Meanwhile, the sliding friction of plastic profiles for the first time, also cut the cost of the old plan. Manipulation of heavy cast iron yoke splines or placed in another way the rest of the machine shaft, the clutch at all break bearing system where the dominant position. In some environments, for these hardened steel fork coupled to more long-term durability results. 20th century, 60 years, broke the clutch system is an important component and growth policy is to cut costs.