Rollers: The primary load-bearing elements in roller bearings are cylindrical, tapered, or spherical rollers.
Inner Ring (Inner Race): The inner ring, also known as the inner race, is a ring-shaped component that fits directly onto the rotating shaft or axle. It provides a smooth and precise surface for the rollers to roll against.
Outer Ring (Outer Race): The outer ring, encases the inner components of the bearing and provides a stable housing for the rollers. It typically has a groove or track for the rollers to run along.
Cage (Retainer): The cage, often called the retainer, holds the rollers in their proper positions and prevents them from contacting each other. It ensures that the rollers are evenly spaced within the bearing.
Seals and Shields: Seals are typically used for applications where protection is essential, while shields provide less protection but lower friction for the roller bearings.
Mounting Surfaces: The outer ring of the bearing often includes mounting surfaces or flanges, which facilitate the attachment of the bearing to a housing or support structure.
Clearance and Preload: Clearance refers to the internal gap between the rolling elements and the rings, while preload is a deliberate axial load applied to eliminate clearance and enhance the bearing's stiffness.
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