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Thrust cylindrical roller bearings FAQS

QWhat are the classifications of cylindrical roller bearings?

ACylindrical roller bearings can be divided into different structures such as single row, double row and multi row cylindrical roller bearings depending on the number of rows of rolling elements. Different structural bearings are also shown in the design of the ribs. Among them, cylindrical roller bearings are commonly used in the following forms: Single row cylindrical roller bearings: Single row cylindrical roller bearings are separable bearings for easy installation and disassembly. Both ferrules can be tightly fitted. The modified contact line between the roller and the raceway reduces stress concentration. Double row cylindrical roller bearings: Double row cylindrical roller bearings are floating bearings, and their separability makes installation and disassembly convenient. A tight fit can be used for both ferrules. Double row cylindrical roller bearings have almost no inclination angle.

QHow to correctly install cylindrical roller bearings?

ALarge FCDP four-row cylindrical roller bearings are separable bearings. The main structure is as shown on the right: the rolling element cage is a four-row, two-half outer ring, a middle spacer and two ribs. Generally, the FCDP structure bearing is bulky and heavy, and cannot be installed and assembled by manpower. Since the parts are dispersed, they need to be placed one by one in the bearing housing, and the rolling elements and the outer ring need to be hoisted by air or other equipment. As with ordinary four-row cylindrical bearings, unpacking and inspecting the appearance, checking the mating surfaces, etc. are not repeated here. difference: Each row of rolling elements and raceways have corresponding numbers and are installed in numerical order. The number is the manufacturer's distinction between the raceways corresponding to each row of rolling elements of the bearing, and also the use of the bearing. (here, the side of the roller body is 4, and the roller head is 1). Install the side retaining ring to the bottom of the bearing box. The outer ring numbered 4 and 3, and the side numbered 4 is facing down. A row of rolling elements numbered 4 is first loaded into the outer ring, and then the rolling elements and the outer ring are lifted.

QHow to clean cylindrical roller bearings?

AWhen the bearing is removed and inspected, the appearance record is first recorded by photography. Also, verify the amount of lubricant remaining and sample the lubricant before cleaning the bearings. a. The cleaning of the bearing is carried out by rough washing and fine washing, and a metal mesh frame can be placed on the bottom of the used container. b. When rough washing, remove the grease or adhesive with a brush or the like in the oil. At this time, if the bearing is rotated in the oil, be careful that the rolling surface will be damaged by foreign matter or the like. c. When washing finely, slowly rotate the bearing in the oil and carry out it carefully. The cleaning agent generally used is a neutral non-aqueous diesel oil or kerosene, and a warm alkali liquid or the like is sometimes used as needed. Regardless of which cleaning agent is used, it is often filtered and kept clean. Immediately after cleaning, apply anti-rust oil or anti-rust grease to the bearing.

QWhat is Attention problem about cylindrical roller bearings?

AVibration aspect In normal use, vibration is quite sensitive to bearing damage, and peeling, indentation, rust, cracks, wear, etc. are reflected in the bearing vibration measurement. Therefore, the magnitude of the vibration can be measured by using a special bearing vibration measuring device (frequency analyzer, etc.), and the specific situation of the abnormality can be inferred by the frequency distribution. The measured values vary depending on the conditions of use of the bearing or the mounting position of the sensor. Therefore, it is necessary to analyze and compare the measured values of each machine in advance to determine the judgment standard. Temperature aspect The high temperature often indicates that the cylindrical roller bearing is in an abnormal condition. High temperatures are also harmful to the lubricant of the bearing. Sometimes bearing overheating can be attributed to the lubricant of the bearing. Long-term continuous rotation of the bearing at temperatures above 125 °C will reduce bearing life. The causes of high temperature bearings include: insufficient lubrication or excessive lubrication, impurities in the bearing raceway, excessive speed limit, and long-term overload operation of the bearings.