What are the characteristics and uses of roller bearings?

Roller and raceway are in line contact or repair line contact, and have large radial load capacity, suitable for those subjected to heavy load and impact load.

2: The friction coefficient is small, suitable for those high speeds, and the limit speed is close to the deep groove ball bearing.

3: N-type and NU-type can move axially, can adapt to the change of the relative position of the shaft and the shell caused by thermal expansion or installation error, and can be used as a free end support.

4: The machining requirements for the shaft or the seat hole are relatively high, and the relative deflection of the outer ring axis after the bearing is installed must be strictly controlled to avoid contact stress concentration.

5: The inner ring or the outer ring can be separated to facilitate the installation and disassembly of the bearing.

The main uses are: large and medium-sized motors, rolling stock, machine tool spindles, internal combustion engines, generators, gas turbines, gearboxes, rolling mills, vibrating screens, and lifting and transporting machinery.

Both ball bearings and roller bearings are rolling bearings. The simplest one is that the rolling elements are balls, which are steel balls. The other rolling element is a steel column.

Ball bearing:

One type of rolling bearing, the ball is installed in the middle of the inner steel ring and the outer steel ring, and can withstand large loads. Also called ball bearings.

The ball bearing mainly consists of four basic components: ball, innerring, outerring and cage retainer, as shown. General industrial ball bearings meet the AISI 52100 standard. Balls and rings are usually made of high chrome steel with a Rockwell C-scale hardness of between 61 and 65. The hardness of the retainer is lower than that of the ball and the ring, and the material is metal (such as: medium carbon steel, aluminum alloy) or non-metal (such as: Teflon, PTEF, polymer material). Rolling bearings have less rotational frictional resistance than journal bearings, so at the same speed, the temperature due to friction is lower.

Roller bearings:

The rolling element is a radial rolling bearing of a cylindrical roller. Cylindrical rollers and raceways are line contact bearings. Load capacity, mainly bear radial load. The rolling element has little friction with the ferrule rib and is suitable for high speed rotation. According to the ferrule with or without ribs, there are single row bearings such as NU, NJ, NUP, N, NF, and double row bearings of NNU and NN. The bearing is a structure in which the inner ring and the outer ring are separable. Cylindrical roller bearings with no ribs on the inner or outer ring, the inner and outer rings can move relative to the axial direction, so they can be used as free end bearings. A cylindrical roller bearing with a single rib on one side of the inner and outer rings and a single rib on the other side can withstand a certain degree of axial load in one direction. Steel stamping cages or copper alloy cages are generally used. However, some use polyamide shaped cages.

1. Roller and raceway are in line contact or repair line contact, and have large radial load capacity, suitable for heavy load and impact load.

2. The friction coefficient is small, suitable for high speed, and the limit speed is close to the deep groove ball bearing.

3. The N-type and NU-type can move axially, can adapt to the change of the relative position of the shaft and the shell caused by thermal expansion or installation error, and can be used as a free end support.

4. The machining requirements for the shaft or the seat hole are relatively high, and the relative deflection of the outer ring axis after the bearing is installed must be strictly controlled to avoid contact stress concentration.

5. The inner or outer ring can be separated for easy installation and disassembly.

Main uses: large and medium-sized motors, rolling stock, machine tool spindles, internal combustion engines, generators, gas turbines, gearboxes, rolling mills, vibrating screens, and lifting and transportation machinery.