The design of radial bearing, also known as a deep groove bearing, is to reduce rotational friction and support loads. This is achieved by using two races to hold the balls and a pressed or machined cage to keep them separated and spread the load through the balls. As the bearing race rotates it causes the balls to rotate. The ball provides for substantially less rolling resistance and coefficient of friction than if two flat surfaces were rotating.Single-row, deep groove radial ball bearings are the most common bearing type, having a wide range of applications. Radial bearings are made with very high levels of precision and used in applications where rotational performance and low torque is necessary, but load is a secondary issue.Deep-groove bearings however do have higher load ratings for their size than shallow-groove ball bearings, but are also less tolerant of misalignment.To overcome this misalignment a self-aligning bearing is used and is usually a double row style.Bearings are classified broadly according to the type of operation, the motions allowed, or to the directions of the loads (forces) applied to the parts. For all these different application there is a bearing made.
Cylindrical Roller Bearings
Cylindrical Roller bearings are designed to carry heavy loads—the primary roller is a cylinder, which means the load is distributed over a larger area, enabling the bearing to handle larger amounts of weight. This structure, however, means the bearing can handle primarily radial loads, but is not suited to thrust loads.Cylindrical roller bearings are available in many designs, series and sizes. The major design differences between the bearings are the number of roller rows (one, two or four) and the type of cage (with, without or special designs)Bearings with cage can accommodate heavy radial loads, rapid accelerations and high speeds.Full complement bearings (without cage) incorporate a maximum number of rollers and are therefore suitable for very heavy radial loads at moderate speeds.The configuration of the inner and outer ring flanges (position and number of guide flanges) allows for different mounting and applications.
For applications where space is an issue, a needle bearing can be used. Despite their low cross sectional height, they have a high load carrying capacity.Needle bearings work with small diameter cylinders, so they are easier to fit in smaller applications.They also can be made in full complement for higher load capacity and moderate speed or cage guided for lower loads and higher speeds.Needle roller bearings are also available in many designs, series and sizes.Hardened inner rings can be used for the needle roller to run on when a hardened shaft is not used.
Tapered Roller Bearings
Tapered roller bearings have tapered inner and outer ring raceways as well as tapered rollers. They are designed to take both radial and axial loads at the same time and behind ball bearings are the most widely used bearing in the world.Double- or two-row tapered roller bearings feature double cups and two single cones. They are available in a variety of configurations for general industrial and automotive applications.
Transmission bearings which are often referred to as insert bearings or wide inner ring, are based on sealed deep groove ball bearings in the 62 and 63 series, but have a convex outer ring and a w housings with corresponding spherical inside surfaces to compensate for shaft misalignment.lications. The inner ring is usually extended on both sides of the race to provide additional shaft support, and is locked to the shaft by specially designed setscrews, an eccentric self-locking collar, or a concentric collar.Transmission bearing units consist of a housing, bearing and seal that is pre-assembled and greased at the factory. These bearing units offer a simple, cost-effective solution with the ability to carry radial, thrust and combined loads, while providing low friction qualities. Available in both steel and stainless steel.
A universal joint is a cross shaped mechanical device that allows one or more rotating shafts to be linked together, allowing the transmission of torque and/or rotary motion. It also allows for transmission of power between two points that are not in line with each other.They have four caps with needle rollers in then to take radial loads.Universal joints come in a wide variety of shapes, sizes and configurations to accommodate the infinite amount of applications they can go into.
A belt is a loop of flexible material used to link two or more rotating shafts mechanically, most often parallel.They are looped over pulleys to create a drive from mechanical power to be transmitted across axles. They run smoothly and with little noise, Belt drives are simple, inexpensive, and do not require axially aligned shafts. They help protect machinery from overload and jam, and damp and isolate noise and vibration.. They need no lubrication and minimal maintenance. Different speeds can be obtained by stepped or tapered pulleys.For a more direct and nonslip drive toothed or timing belts can be used.
Oil seals are used to fill the gap between a housing and a rotating shaft. It’s job is to stop a fluid , be it oil , grease or water from leaking out. It also creates a barrier to stock contaminants like dirt and water from coming.Mechanical seal rely on one stationary surface and one rotating surface to rub together to create barrier so water does not leak out.O rings are used mainly for two stationary surfaces to create the seal.