Sliding Bearings
Sliding bearings do not have inner or outer rings and do not contain rolling elements. They are generally made of wear-resistant materials. They are commonly used in low-speed, light-load mechanical rotating parts where lubrication and maintenance are difficult.
Spherical Plain Bearings
Spherical plain bearings have a spherical sliding contact surface and are mainly suitable for oscillating, tilting, and rotating motions.
Rolling Bearings
Rolling bearings are classified into radial bearings and thrust bearings according to the direction of the load they can withstand or their nominal contact angle. Radial contact bearings are radial bearings with a nominal contact angle of 0°, while radial angular contact bearings have a nominal contact angle greater than 0 to 45 degrees. Axial contact bearings are thrust bearings with a nominal contact angle of 90 degrees, while thrust angular contact bearings have a nominal contact angle greater than 45 degrees but less than 90 degrees.
Based on the shape of the rolling elements, they can be classified into ball bearings and roller bearings. Roller bearings are further classified according to the type of rollers: cylindrical roller bearings, needle roller bearings, tapered roller bearings, and self-aligning roller bearings.
Bearings can be classified according to their self-aligning ability during operation: self-aligning bearings (bearings with spherical raceways that can accommodate angular misalignment and angular motion between the raceway centers) and non-self-aligning bearings (rigid bearings) (bearings that resist angular misalignment between raceway centers).
Bearings can also be classified according to the number of rows of rolling elements: single-row bearings, double-row bearings, and multi-row bearings.
Bearings can be classified according to whether their components (rings) can be separated: separable bearings and non-separable bearings.
Bearings can also be classified according to their structural shape (e.g., presence or absence of filling grooves, shape of inner and outer rings and raceways, flange structure, and even presence or absence of cages).
Bearings can be classified according to their outer diameter: miniature bearings (<26mm), small bearings (28-55mm), medium-small bearings (60-115mm), medium-large bearings (120-190mm), large bearings (200-430mm), and extra-large bearings (>440mm).
Bearings can be classified according to their application: motor bearings, rolling mill bearings, main bearings, etc.
Bearings can be classified according to their material: ceramic bearings, plastic bearings, etc.
