How to Prolong Bearing life and / or Service Performance
How to Prolong Bearing life and / or Service Performance
2022年3月22日
Causes Affecting the Service Life of Koyo Bearings and Maintenance Measures
Causes Affecting the Service Life of Koyo Bearings and Maintenance Measures
2022年3月22日

Basic Principles of lubricating Oil Selection

  • The provisions on lubrication specifications in the equipment manual are the basis for the selection of oil products for the equipment. If there are no instructions or provisions, the equipment user shall choose by himself.Basic Principles of lubricating Oil Selection
  •  The following principles shall be followed when selecting oil products:Basic Principles of lubricating Oil Selection
  • a. Movement speed: the higher the speed, the easier it is to form an oil wedge. Low viscosity lubricating oil can be selected to ensure the existence of oil film bearing. If the viscosity is too high, the impedance will be large, the calorific value will be large, and the temperature will be too high. During low-speed operation, the load is carried by the viscosity of the oil, and the lubricating oil with higher viscosity should be selected.Basic Principles of lubricating Oil Selection
  • b. Bearing load: the greater the general load, the higher the viscosity of the selected lubricating oil. The allowable bearing capacity of oil products shall be considered for low speed and heavy load.Basic Principles of lubricating Oil Selection
  • c. Working temperature: when the temperature changes greatly, the oil with high viscosity index shall be selected.Basic Principles of lubricating Oil Selection
  • Under high temperature conditions, the oil with high viscosity and flash point, good oiliness and anti-oxidation stability and corresponding additives shall be selected. Low temperature resistant oil with low viscosity, less moisture and low freezing point shall be selected for work under low temperature conditions.Basic Principles of lubricating Oil Selection
  • d. Working environment: oil products with strong demulsibility, oil and rust resistance shall be selected in humid environment and aerosol environment, and dust-proof sealing shall be paid attention to in dusty environment. Oil with good corrosion resistance shall be selected for the environment with corrosive gas.

Basic Principles of lubricating Oil Selection

  • ④ “Five determinations” and “three filtration” of lubrication
  • “Five determinations” and “three filtration” of equipment lubrication are effective methods to standardize and standardize daily lubrication technology management and ensure good equipment lubrication. Its contents are:Basic Principles of lubricating Oil Selection
  • Five determinations:Basic Principles of lubricating Oil Selection
  • a. Fixed point: determine the lubrication position and lubrication point of each equipment. Implement fixed-point oil supply.
  • b. Quality determination: determine the type, brand and quality requirements of the oil required for the lubricating parts of the equipment, and the quality of the oil must be tested and qualified.
  • c. Quantitative: determine the quantity of each refueling and oil change at the oil feeding part, and implement fuel consumption quota management and quantitative oil change.
  • d. Regular: determine the oil adding and changing cycle of each lubricating part, add oil, clean and change oil according to the specified cycle, and sample and test the oil tank with large oil storage capacity according to the regulations to determine the next sampling inspection and oil changing time.
  • e. Fixed person: determine the division of labor of operators, maintenance workers and lubrication workers for refueling, oil filling, cleaning and oil change of equipment lubrication parts, and take their own responsibilities to jointly complete the lubrication of equipment.
  • III. filtration:
  • a. Warehousing filtration: the filtration of oil during transportation and warehousing.
  • b. Distribution and filtration: filter the oil when it is injected into the lubrication container.
  • c. Refueling and filtering: filter the oil when it is added to the oil storage part.
  • ⑤ Conditions for good equipment lubrication:
  • a. All lubricating devices, such as oil nozzle, oil cup, oil standard, oil pump and system pipeline, are complete, clean, easy to use and unblocked;
  • b. All lubricating parts and points shall be filled with oil according to the requirements of “five determinations” in the lubrication chart to eliminate the phenomenon of oil shortage and dry grinding;
  • c. Linoleum and linoleum shall be complete, clean and placed correctly;
  • d. The oil and coolant shall not deteriorate or mix, and meet the requirements;
  • e. Important parts such as sliding and rotation are clean and have thin oil film;Basic Principles of lubricating Oil Selection
  • f. All parts are free of oil leakage.Basic Principles of lubricating Oil Selection
  • a. Grease replenishment interval
Basic Principles of lubricating Oil Selection
  • Due to the increase of mechanical action, aging and pollution, the lubricating base filled in the bearing configuration will gradually lose its lubricating performance. Therefore, the lubrication rank needs to be continuously supplemented and updated. The interval of lubricant replenishment varies with the formation, size and speed of the bearing. The approximate interval of grease replenishment is required according to the operation time.
  • In addition, when the bearing temperature exceeds 70 ℃, the replenishment interval of lubricating grease shall be reduced by half for every 15 ℃ rise in the bearing temperature.
  • The double-sided closed bearing has been filled with grease during manufacturing. “HRB” uses standard grease in these products. The common operating temperature range and other properties are suitable for the specified occasions, and the grease filling amount is also corresponding to the size of the bearing. The service life of the grease can generally exceed the service life of the bearing. Except for special occasions, it is not necessary to supplement grease.Basic Principles of lubricating Oil Selection
  • b. Replacement cycle of lubricating oil
  • The replacement cycle of lubricating oil is different due to service conditions and oil quantity. Generally, when it is used in a good environment with operating temperature below 50 ℃ and less dust, it shall be replaced once a year. When the oil temperature reaches 100 ℃, it shall be replaced once in 3 months or less.Basic Principles of lubricating Oil Selection