The amount of oil required for smooth lubrication of rolling bearings depends largely on the bearing type, the oil supply system, the type of lubricant used, and other factors. It is difficult to provide a universally applicable formula that fits all situations. However, there are some general guidelines that can help in determining the appropriate oil quantity. For example, the oil quantity calculation often involves the bearing width (B) and the inner diameter (d), both measured in millimeters. Based on these values, the actual oil supply should be increased by 4 to 20 times to ensure optimal performance. To achieve the best lubrication effect, it's recommended to conduct tests to determine the exact oil supply amount. Bearings with active fluid transmission, such as angular contact ball bearings, require more oil compared to those without, like double-row cylindrical roller bearings. This difference becomes more significant when the speed coefficient (n × dm) is high. Through extensive testing, an empirical formula for oil supply has been established:
Q = W × d × B, where: - Q is the oil supply in mm³/h, - W is a coefficient (typically 0.01 mm/h), - d is the inner diameter in mm, - B is the bearing width in mm.
For high-speed bearings, it's essential to ensure that the lubricating oil is reliably delivered into the bearing. Methods such as nozzle delivery or proper device orientation should be carefully considered. The lubrication method largely depends on the bearing type and the equipment setup. It is best to use a special nozzle to deliver the oil directly into the bearing. The length of the nozzle should be between 0.5 to 1.0 mm, depending on the bearing size. In addition, oil should be directed to the outer ring of the bearing. For single-row bearings, the ideal lubrication method is to introduce oil from one side. The nozzle hole should be aligned with the inner ring and not point toward the cage. Especially in cases where the bearing itself does not easily retain the oil flow, such as in angular contact ball bearings, the oil must enter the bearing in the correct direction. In such cases, it's important to check whether the oil reaches the pressure zone formed between the rolling elements and the outer ring. When the bearing’s outer diameter is between 150 and 280 mm, additional nozzles may be necessary. For double-row bearings, the oil should be sprayed into the bearing at the level of the outer raceway to ensure even distribution and smooth operation. Additionally, to prevent the formation of oil sludge at the bottom of the bearing, a drain pipe should be installed. Its length should be greater than 5 mm. These considerations are influenced by factors such as the type of lubricant, the lubrication method, the bearing type, and the installation method. With the increasing demands of modern machine tools, especially for high-speed spindles, further detailed discussions on the parameters of the oil-air lubrication system are necessary to ensure optimal performance and reliability.
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Common terms and definitions for rolling bearing components (1) NSK imported bearing, one-way bearing ferrule processing process, nano-ceramic bearing, grinding process of bearing in rolling mills, smoothness of rolling mill bearings |
1. Components of piston rod seal:
Polyurethane, polyformaldehyde, rubber
2. Purpose and function of piston rod seal:
The rod seal belongs to the dynamic seal. It is the seal that moves with the piston rod. It is one of the important components on the hydraulic support.
3. Use position of piston rod seal:
Guide sleeve, piston
4. Working principle of piston rod seal:
It is used at the contact part between the guide sleeve and the outer cylinder to seal the emulsion in the outer cylinder.
5. What effects will be caused by improper use or operation of piston rod seal:
1. Improper selection of cavity support material will wear the cavity and piston rod.
2. The size of the friction pair is inappropriate, causing wear.
3. Improper thread guide angle of cylinder barrel and piston end wear the sealing ring.
4. The seal ring is worn due to improper installation guide angle of the seal.
5. The surface of cavity and piston rod is rough, with scratches and worn seals.
6. The outer cylinder leaks and the jack does not maintain pressure.
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DG Zhongxingshun Sealing Products Factory , https://www.zxs-seal.com