Introduction
Recirculating ball bearings are bearings with metal balls in which the outer surface of the inner and outer races is recessed for the bearing roller. The inner and outer race is divided into a number of grooves which accommodate the bearing balls in a row. Balls roll in their circular and helical race grooves. The balls are kept separated and pressed against the internal and external races by the retainer. The force of the bearing balls against the races is the result of their preload, which is set by the application of the bearings retaining components.
Types
Ball bearings have different types, including deep groove, double row, single row and angular contact.
Deep groove ball bearings are the most widely used bearing type. They have an open configuration, which allows grease to be injected directly and freely between the balls, so that the bearings can be easily preloaded with grease. They are very robust and resistant to decision fatigue. These bearings can be used to transmit both radial and axial forces.
Double row ball bearings are primarily used to accommodate higher loads in high-precision applications. They normally have two inner and outer rings, between which two rows of bearing balls overlap, allowing for axial and radial loads. Since the balls are used for radial and axial loading, higher accuracy and stability are ensured.
Single row ball bearings are ideal for carrying light to moderate radial or thrust loads, or in applications where the bearing is preloaded with grease or oil. They are the most popular type of bearing and are usually the most cost effective. Single row radial ball bearings can only carry radial loads, therefore their internal design is designed for this purpose
Angular contact ball bearings are typically used for applications that require radial and axial loads to be absorbed in one direction. They are mainly used in motor applications to support radial, axial and combined loads. They have an inner and outer race and can be preloaded with grease.
Applications
Ball bearings have a wide range of applications in many industries, including automotive, mining, agricultural, aerospace and medical industries. In automotive applications, ball bearings are used for wheel and transmission systems, suspension, steering and braking systems. Mining applications include conveyor systems, ball mills and hoists. Agricultural applications involve pumps, engines and transmissions. Aerospace applications include landing gear and flaps, engine and propeller components, instrumentation and avionics systems. Medical applications include orthopaedic implants, dental drills and micro machines.
Conclusion
Ball bearings are widely used in a variety of applications in a diverse range of industries. Their primary function is to reduce friction and provide support, allowing moving parts to freely move while carrying different loads. They are characterized by their load capacity, size and shape, contact angles, preload and accuracy. Ball bearings provide high performance, reliability, robustness and longevity, making them an ideal solution for a wide range of applications.
