Cylindrical Roller Bearing Application
Cylindrical roller bearings are suitable for rigid double-supported short shafts, shafts that cause axial displacement due to thermal elongation, and machine parts that need to be separated for installation and disassembly. Different kinds of cylindrical roller bearings created by THB Bearings can meet various demands from customers all over the world. Cylindrical roller bearings are mainly applied in the following industries: large and medium-sized electric motors, rolling stock, machine tool spindles, internal combustion engines, generators, gas turbines, gearboxes, steel rolling mills, vibrating screens, lifting and transportation machinery.
Cylindrical Roller Bearing VS Ball Bearing
They are all moving high-load bearings; the difference is that the moving load contact surfaces of ball bearings and roller bearings are point contact and line contacts, respectively.
Cylindrical Roller Bearing Types
Cylindrical rollers and raceways are linear contact bearings. With huge load capacity, cylindrical roller bearing mainly bears radial load. The friction between the rolling element and the retaining edge of the ring is small, which is suitable for high-speed rotation. According to 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 and NN. Cylindrical roller bearing has a separable structure with inner ring and outer ring.
Cylindrical roller bearings without ribs on the inner ring or outer ring, the inner ring and outer ring can move relative to the axial direction, so it can be used as a free end bearing. Cylindrical roller bearings with double ribs on one side of the inner ring and outer ring and a single rib on the other side of the ring, can bear a certain degree of axial load in one direction. Generally, stamping steel cages or solid cages made of copper alloy cars are used.
Cylindrical roller bearings are separable bearings, which are very convenient for installation and disassembly. Cylindrical roller bearings can withstand larger radial loads and are suitable for use in high-speed running situations.
This type of bearing allows a very small angular error (inclination) between the axis of the inner ring and the axis of the outer ring, only 2'～4'. Therefore, the machining accuracy of the shaft and the bearing seat is relatively high. Otherwise, uneven load or stress concentration is likely to occur in the contact part of the raceway. But after correcting the roller or raceway contact bus bar, the occurrence of stress concentration can be reduced.
Cylindrical roller bearings can be divided into single-row, double-row and multi-row cylindrical roller bearings according to the number of rows of rolling elements. Bearings of different structures are also shown in the design of the position of the ribs. Among them, the commonly used cylindrical roller bearings have the following forms.
Cylindrical Roller Bearing Features
Roller and raceway are in linear contact or curved contact after modification, with large radial bearing capacity, suitable for bearing heavy loads and impact loads.
The friction coefficient is small, suitable for high speed, and the limit speed is close to the deep groove ball bearing.
The N type and NU type can move axially, can adapt to the change of the relative position between the shaft and the housing caused by thermal expansion or installation error, and can be used as a free end support.
The processing requirements for the shaft or the seat hole are high, and the relative deflection of the outer ring axis after the cylindrical roller bearing is installed must be strictly controlled to avoid contact stress concentration.
The inner ring or outer ring can be separated for easy installation and disassembly.
Cylindrical Roller Bearing VS Deep Groove Ball Bearing
The main difference between the two types of bearings lies in rolling elements, one is spherical rolling element, the other is cylindrical rolling element. It is precisely because of this reason that the following differences between them have occurred.
Different bearing capacity: the contact surface of spherical rolling element and cylindrical rolling element is different. The spherical contact surface is a point, while the cylindrical contact surface is a line. Therefore, under the same size, the radial bearing capacity of cylindrical roller bearings is greater than that of deep groove ball bearings.
Different speeds: Because the contact surfaces of the rolling elements of the two bearings are different, their speeds are also different. The larger the contact surface is, the slower the relative speed is. Therefore, deep groove ball bearings with spherical rolling elements have an advantage in speed.
The noise is different: When the speed of the bearing of the same size is the same, the noise of the cylindrical roller bearing is greater than that of the deep groove ball bearing. This is also because the friction caused by the different contact surfaces of the rolling elements of the two bearings is different. The greater the friction surface, the greater the noise.
The difference between them is due to their different rolling elements. This also confirms one thing. Every component in the bearing is an important part of its overall structure. Bearings are composed of different structures and different components have different characteristics.