The Pivot Bearing Assembly is a critical component within the Bending Arm Assembly, responsible for enabling smooth rotational movement at the arm's primary pivot joint. It consists of bearing elements housed within a structural casing, designed to withstand radial and axial loads while minimizing friction and wear during bending operations. The assembly is typically used in machinery where a bending arm must rotate around a fixed pivot, such as in material handling equipment, robotic arms, or industrial presses. Its design ensures that the arm can move with precision and repeatability, which is essential for accurate positioning and force transmission. The bearing elements, which may be rolling-element (ball or roller) or plain bearings, are selected based on the load, speed, and environmental conditions of the application. The housing is machined to precise tolerances to maintain alignment and protect the bearings from contamination. Lubrication is provided to reduce friction and dissipate heat, extending the service life of the assembly. The Pivot Bearing Assembly is available in a range of sizes and configurations to suit different shaft diameters, housing fits, and load requirements. Key parameters include bore diameter (20–50 mm, tolerance H7), outer diameter (40–90 mm, tolerance h6), height (15–40 mm), dynamic load rating (10–50 kN, based on 1 million revolutions, ISO 76), static load rating (15–70 kN, ISO 76), maximum speed (100–500 rpm), operating temperature (-40 to 85°C), radial clearance (0.01–0.05 mm, C3 clearance, ISO 5753), tilt angle (±5 to ±15 degrees), and weight (0.5–3.0 kg). Materials include bearing steel (GCr15, per GB/T 18254) and hardened alloy steel, with contact seals (2RS, per ISO 6194) for contamination protection. These specifications are reference ranges and must be verified for the specific model and application with the legal manufacturer or supplier.
The assembly utilizes rolling-element bearings (such as ball or roller bearings) or plain bearings to separate moving surfaces. When the bending arm rotates around its pivot point, the bearing elements facilitate this motion by reducing direct metal-to-metal contact, thereby decreasing friction, heat generation, and mechanical wear. The bearings are housed in a casing that maintains proper alignment and distributes loads evenly. Lubricant is applied to the bearing surfaces to further reduce friction and protect against corrosion. The design allows for radial and axial load support, with radial clearance (C3) accommodating thermal expansion. The tilt angle capability enables self-alignment, compensating for minor misalignments in the mounting structure.
