Roller bearings mainly consist of four parts: an outer ring, an inner ring, rolling elements (rollers), and a cage.
The outer and inner rings are usually made of high-carbon chromium bearing steel, providing the tracks for the rollers; the rolling elements (cylindrical, tapered, or spherical rollers) are the core components that bear the load; the cage is used to evenly separate the rolling elements, prevent them from colliding with each other, and guide their movement.
Detailed Composition and Function:
Outer and Inner Rings: Made of bearing steel such as GCr15, after heat treatment, the hardness reaches HRC58-62, ensuring wear resistance and fatigue strength. The inner ring is usually fitted to the shaft, while the outer ring is fixed to the bearing housing.
Rolling Elements: The rolling elements of cylindrical roller bearings are cylindrical, and the line contact design makes their load-carrying capacity higher than that of ball bearings. The materials must match the hardness of the inner and outer rings, and the surface roughness must be controlled within Ra0.05μm to reduce friction.
Cage: Steel cages (such as SPCC) are high-strength and suitable for high-speed applications; nylon cages are lightweight and corrosion-resistant. The cage window spacing error must be ≤0.1mm to ensure uniform roller distribution.