Tham khảo tài liệu 'the design of rolling bearing mountings (fag bearing co) episode 11', kỹ thuật - công nghệ, cơ khí - chế tạo máy phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | 123 Azimuth axis track roller and king pin bearings The radiotelescope with its complete superstructure is supported on a circular track of 64 m diameter. The roller track assembly comprising four groups of eight rollers each transmits the weight of approximately 30 000 kN. Every second roller of a roller group is driven. Each roller is supported on two spherical roller bearings FAG . The bearings are mounted on the journal with withdrawal sleeves FAG AH3060H. In the most adverse case one bearing has to accommodate approximately 800 kN. With the static load rating C0 3 550 kN the bearings are safely dimensioned. The outer rings of the bearings are mounted into the housings with axial clearance so that a floating bearing arrangement is obtained. Since low friction is required the rollers to not incorporate wheel flanges. Thus it is necessary to radially guide the superstructure on a king pin bearing. The FAG cylindrical roller bearing provided for this purpose has the dimensions 1 580 x 2 000 x 250 mm. The cylindrical roller outside diameters are slightly crowned in order to avoid edge stressing. By mounting the bearing with a tapered sleeve the radial clearance can be eliminated thus providing accurate radial guidance. Machining tolerances Track rollers Housing to H7 King pin Journal to h7 housing to M7 Lubrication sealing The spherical roller bearings in the track rollers are lubricated with FAG rolling bearing grease Arcanol L135V. The cylindrical roller bearing for the king pin features circulating oil lubrication. Sealing by multiple labyrinths. 123a Roller track assembly 123b King pin bearing 124 Data whee. The data wheel is supported on a clearance-free FAG four-point bearing with the dimensions 1 300 x 1 500 x 80 mm. Radial runout 10 pm Axial runout 25 pm. Lubrication sealing The four-point bearing is fully immersed in oil. Sealing by a multiple labyrinth. Machining tolerances The four-point bearing is fitted according to the actual bearing .
