Bearing grease quantity calculation and the oil way design - bearing knowledge

4. 1 bearing lubricating oil quantity computation quantity of oil required for the rolling bearing lubrication depends largely on the bearing type, type of fuel supply system design, lubricating oil etc. It is difficult to get a suitable for any situation, simple formula has extensive applicability. Which has the function of automatically transmission oil bearing ( Such as the angular contact ball bearing) With oil automatic transmission oil amount is greater than the required function of bearing ( Such as double row cylindrical roller bearings) The oil amount. Especially when the speed coefficient ( n。 dm) Value is bigger, the more obvious difference ( Figure 3) 。 Through a large number of experiments, oil supply quantity Q a rough calculation formula is as follows: figure 4 oil way Q = WdB type of Q - — Oil, mm3 / hW - — Coefficient of 0. 01 mm / h d - — Bearing inside diameter, mmB - — Bearing width, mm, however, the actual oil and on the basis of the numerical expansion of 4 ~ 20 times. In order to obtain the best lubricating effect, still need to adjust how much oil through the experiment. 4. 2 oil way design for high speed rotating bearing, in order to reliably put lubricating oil in the bearing internal, should attach great importance to oil supply way ( Such as the nozzle form and installation location, etc. ) In the design. Bearing lubrication mode depends entirely on the bearing type and configuration mode ( Figure 4 a) 。 For single bearing, best way to from one into the bearing lubrication. Nozzle hole should be flush with the inner ring, and can't point to cage. Especially when bearing its own direction of discharge of oil absorption is not easy to determine ( Such as the angular contact ball bearing) Enter the bearing internal, lubricating oil must be according to the direction. If conditions permit, lubricating oil through a special nozzle and then into the best bearings inside. Nozzle length depends on the bearing size, diameter of 0. 5 ~ 1. 0mm。 Also allow the lubricant to the bearing outer ring ( Figure 4 b) 。 In this case, should pay attention to see whether lubricating oil into the ball, and formed between the outer pressure area. For double row bearings, lubricating oil must be from the bearings and their internal flush heats the local injection of bearing, with sufficient lubrication of the bearing. When bearing outside diameter is between 150 ~ 280 mm, need to add a nozzle. In addition, in order to prevent the formation of oil sludge precipitation at the bottom of the bearing, you need to install a drain pipe, its length is more than 5 mm. In order to meet the requirements of modern machine tools the spindle on the lubrication system, the oil - All parameters of the gas centralized lubrication system are also further detailed and accurate research. This is because: lubricating oil type, lubrication method, quantity of lubrication and bearing type, bearing configuration factors have decisive role on bearing speed increase.