Excavator specific bearing

Self-aligning ball bearings come in two structures: cylindrical bore and tapered bore. The materials of the cages include steel plates, synthetic resins, etc. Its characteristic is that the outer raceway is spherical in shape, which has self-aligning property and can compensate for the errors caused by different concentricity and shaft deflection. However, the relative inclination between the inner and outer rings shall not exceed 3 degrees.

Among the ultra-small aperture miniature bearings, the types of miniature deep groove ball bearings include metric series such as 68, 69, and 60, and six types of imperial series R. On this basis, they can be further classified into series with ZZ steel plate dust covers, series with RS rubber seals, series with Teflon bearing seals, and series with flange retaining rings, etc. Miniature bearings refer to all kinds of bearings with a metric series outer diameter less than 9mm and an imperial series outer diameter less than 9.525mm. The main materials include carbon steel, bearing steel, stainless steel, plastic, ceramic, etc. The smallest inner diameter can be as small as 0.6mm, and the inner diameter of 1mm is the most common.

Thin wall bearings are a type of bearing that achieves extremely thin bearing cross-sections, miniaturization, and lightweight design. They are generally divided into different sealing forms, such as rubber seal RS, iron seal ZZ, etc. They use small outer diameter steel balls to achieve low friction torque, high rigidity, and good rotational accuracy. Meanwhile, the hollow shaft design in thin-walled bearings ensures lightweight and wiring space.

Thrust ball bearings are designed to withstand thrust loads during high-speed operation and are composed of gasket-shaped rings with raceway grooves featuring ball rolling. Because the rings are of the cushion type, thrust ball bearings are divided into two types: flat base cushion type and self-aligning spherical base cushion type. In addition, this type of bearing can withstand axial loads but not radial loads.