Ball bearing bearing

angular-contactfour-rowsteel

Four-contact bearings have similar construction to angular bearings with the geometry specially designed to withstand combined loads. Compared with 2-row or single-row paired angular bearings, they offer the advantage of occupying little axial space. General Features Due to the special internal geometry, they can bear radial and axial loads in both directions and also overturning moments. They can be made in many variations: Shielded with grease (for life); Open without grease; Lubricated directly in the machine with oil or grease. They are normally full-turn ball bearings and have plastic separators to improve rolling and durability. When preloaded, they have the advantage of offering high stiffness. They cannot operate at high RPM. Depending on technical requirements, they can have special coatings, e.g., chrome, phosphating, galvanizing, or black oxide. Materials They can be made of typical chromium bearing steel, full hardening, case-hardening or induction hardening. Main Applications Wheel motors, robotics gearboxes, rotary tables, machine tools, robotics (axis movement).