Tham khảo tài liệu 'fag_rolling_bearing_lubrication part 5', kỹ thuật - công nghệ, cơ khí - chế tạo máy phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | Lubricant Supply Grease Examples of Grease Lubrication Fig. 39 Structures can be uncomplicated if sealed and pre-greased rolling bearings are used. Depending on the application shields or seals can be used singly or in combination with a preseal. Rubbing seals designs RSR or RS increase the bearing temperature due to the seal friction. Shields ZR or Z and nonrubbing seals RSD form a gap with the inner ring and do not add to the friction. The standard grease for deep groove ball bearings sealed on either side is a lithium soap base grease of consistency class 2 or 3 the softer grease being used for small bearings. Approx. 30 of the free bearing space is filled with grease. Under normal operating and environmental conditions this amount of grease is sufficient for a long service life. The grease is distributed during a short run-in period and settles mainly on the inner surfaces of the shields or seals which form an undisturbed area. After the grease has settled circulation is negligible and the bearing runs at low friction. Upon completion of the run-in period friction is only 30 to 50 of the starting friction. Fig. 40 The deep groove ball bearing is sealed on one side. On the other side a grease deposit is formed by means of a baffle plate. Thus a major amount of grease is near the bearing but not inside it. At high temperatures the grease deposited separates oil which lubricates the deep groove ball bearing adequately and over a long period. In this way a longer life is reached during which additional lubricant friction need not be taken into account. FAG will indicate suitable greases on inquiry. Fig. 41 A baffle plate prevents the grease from escaping from bearings with grease pumping or conveying effect or with a vertical axis. Especially for bearing types which have a high rate of sliding friction and an intensive grease pumping or conveying effect . tapered roller bearings a baffle plate is advantageous at higher speeds though not always sufficient.
