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What Factors Should Be Considered When Selecting Cylindrical Roller Bearings

Time:2020.01.07  Source:Roller Bearings Suppliers


Cylindrical roller bearings with spacers and raceways are linear contact bearings. Load capacity, mainly bear radial load. The friction between the rolling element and the collar of the ferrule is small, which is suitable for high-speed rotation. 


Depending on whether the ring has ribs, it can be divided into single-row cylindrical roller bearings such as NU, NJ, NUP, N, NF, and double-row cylindrical roller bearings such as NNU, NN. The bearing has a detachable inner and outer ring structure.


Cylindrical roller bearings with spacers with no ribs on the inner or outer ring, the inner and outer rings can move relatively in the axial direction so that they can be used as free-end bearings. Cylindrical roller bearings with double ribs on one side of the inner ring and outer ring and the single ridge on the other side of the ring can withstand a certain degree of axial load in one direction. Steel stamped cages or copper alloy solid cages are generally used. However, some use polyamide molding cages.

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If you want to choose suitable Cylindrical roller bearings with spacers, you must master the factors of high-temperature bearing modeling, including size restrictions, speed, tolerance, rigidity, installation, and disassembly.

1. Size limitation

(1) Usually, space, where cylindrical roller bearings with spacers can be installed, is limited.

In many cases, the shaft diameter or the inner shaft diameter is affected by the design of the machine and design restrictions. Therefore, the choice of bearings type and size is determined by the bearing inner diameter. The main size tables of the bearings are based on the internal diameter and compiled.

(2) The load of the high-temperature bearing, the pressure applied to the bearing, its nature, size, and direction are variable.

Usually, the rated constant load is shown on the dimension table. However, axial load, radial load, etc. are also essential factors in selecting a right bearings.


2. Speed

The speed is determined according to the type, size, accuracy, type of cage, load, lubrication method, and cooling method of the high-temperature bearing.

The bearing table lists the speed of the dimensional precision bearings under oil lubrication and grease lubrication. Actually, deep groove ball bearings, self-aligning ball bearings, and cylindrical roller bearings are right for high-speed applications.


3. Tolerance

The dimensional accuracy and rotation accuracy ofcylindrical roller bearings with spacers are based on ISO and JIS standards.

For machines that require high precision and high-speed operation, it is recommended to use bearings with a level of 5 or higher accuracy. Deep groove ball bearings, radial thrust ball bearings or cylindrical roller bearings are suitable for machines with high running accuracy.

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4. Rigid

(1) When the moving body of the bearing and the contact surface of the raceway are pressed, elastic deformation will occur. Some machines need to minimize elastic deformation. Roller bearings have less elastic deformation than ball bearings. In some cases, bearings must be preloaded to increase stiffness.

(2) This program is usually used for deep groove ball bearings, radial thrust ball bearings, and tapered roller bearings. The inner and outer rings are offset, the shaft is bent, the tolerance of the rod or bearing box is changed, and the mismatch will cause the eccentricity of the inner and outer rings.

(3) To prevent the strange angle from being too large, self-aligning ball bearings, self-aligning roller bearings, or self-aligning bearing seats are better choices.

(4) Voice frequency and torque, and movable bearings are manufactured according to high-precision scales, so voice and torque are small.

(5) The combination of deep groove ball bearings and cylindrical roller bearings has unique requirements for low noise and low torque.


5. Installation and removal

(1) Some applications require frequent disassembly and installation to ensure inspection and maintenance.

(2) The bearings that can be installed on the inner and outer rings, such as:

Cylindrical bearings, needle bearings, and tapered bearings are very suitable for this occasion.

Tapered bore self-aligning ball bearings and self-aligning roller bearings with the help of the shaft sleeve also simplify the installation process.


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