Straight ball bearings are divided, among others, due to the number of rows of balls into single-row and double-row.
Single row straight ball bearings are popular bearings with versatile applications, produced in a large number of sizes and designs. The raceway grooves on both the outer and inner rings have circular arcs with a slightly larger radius than that of the balls. In addition, radial and axial loads can be applied in both directions. Due to their low torque, they are very suitable for applications where high rotational speeds and low power losses are required.
In addition to open type bearings, there are often bearings with steel plates or rubber seals located on one or two sides of the bearing, filled with grease. Retaining rings on the outer surface are also used. The most common type is a pressed steel cage.
They are sealed on both sides and usually filled with lithium-based grease, which has good anti-corrosion properties and can be used in the temperature range from 30 ° C to +110 ° C. The bearings are lubricated for their entire life and do not require supervision. The amount of grease is adjusted each time to the size of the bearing and in most cases fills 25 to 35% of the free space in the bearing.
Double-row straight ball bearings can be sealed with shields, it is the so-called non-contact seal. It can be a one-sided or two-sided seal. Shields bearings are primarily intended for bearing arrangements with a rotating inner ring. When the outer ring rotates, there is a risk of grease leakage from the bearing with larger rotating rings.
