... adopted optimized structure designing so that can attain the traits of high temperature resistant,high speed resistant, long life, etc3, Sealing structure ... have the traits of high sealing ability, heat-resistant, abrasiveness and also can prevent the leakage of the grease, as they ... of high and low temperature, anti-leakage, so that can attain self-lubrication and low vibration5,Adopt the raw material ...