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Bearing “Bearings” a ball bearing is a type of rolling-element bearing that uses balls to maintain the separation between the bearing races. Bearings can be divided into 2 types : Plain bearings and Rolling bearings

Plain bearing A plain bearing is the simplest type of bearing, comprising just a bearing surface and no rolling elements. Therefore the journal the part of the shaft in contact with the bearing slides over the bearing surface. The simplest example of a plain bearing is a shaft rotating in a hole. A simple linear bearing can be a pair of flat surfaces designed to allow motion; e.g., a drawer and the slides it rests on or the ways on the bed of a lathe. Plain bearing It is a hollow cylinder with a spindle inside. The spindle or shaft that spins inside. The spindle or shaft spins in a bearing is “Journal” , a hollow cylinder is “Journal bearing” . It’s make of metal or soft metal than “Journal”. Plain bearing divide to “Trust bearing” . Journal receives pressure and drive the inside Journal bearing and Guide bearing witch Journal moves back to return as long of Journal bearing. The simple bearing use oil more than grease and use to grease for bearing hasn’t protection or seal enough oil. While journal rolling inside bearing, oil cast same film to protection journal surface and bearing tangent. The stickiness of oil shouldn’t oil film can’t divide surface leave from each other. The selection of oil stickiness in use depend speed pressures and temperature.

Rolling bearing Rolling bearing, is a bearing which carries a load by placing round elements between two bearing rings. The relative motion of the pieces causes the round elements to roll with very little rolling resistance and with little sliding. One of the earliest and best-known rolling-element bearings are sets of logs laid on the ground with a large stone block on top. As the stone is pulled, the logs roll along the ground with little sliding friction. As each log comes out the back, it is moved to the front where the block then rolls on to it. It is possible to imitate such a bearing by placing several pens or pencils on a table and placing an item on top of them. See "bearings" for more on the historical development of bearings. A rolling element rotary bearing uses a shaft in a much larger hole, and cylinders called "rollers" tightly fill the space between the shaft and hole. As the shaft turns, each roller acts as the logs in the above example. However, since the bearing is round, the rollers never fall out from under the load. Rolling-element bearings have the advantage of a good tradeoff between cost, size, weight, carrying capacity, durability, accuracy, friction, and so on. Other bearing designs are often better on one specific attribute, but worse in most other attributes, although fluid bearings can sometimes simultaneously outperform on carrying capacity, durability, accuracy, friction, rotation rate and sometimes cost. Only plain bearings are used as widely as rolling-element bearings.

Ball Bearing Components

Ball bearings are comprised of four major parts: a large ring (outer ring), a small ring (inner ring), balls between the rings (steel balls), and a cage to prevent the balls from hitting each other. The modern structure dates back to around 1500, when Leonardo da Vinci invented ball bearings to reduce friction against the axles of horse drawn carts. For more than 500 years, the ball bearing has been defined by this simple structure.

Outer Ring

Inner Ring

Ring bearings have 2 types: Outer ring and Inner ring, surface of the rings are raceway surface that functions to support burden.

Rolling bearing grain have 2 types: Spherical and Pillow. The pillows have 4 types : cylindrical, needle, slender and curve, to be a workload on them ring and sent to bearing.

Emplacements as dividing range to the grain roller space for grate them and protection for falling out roller bearings.


bearing is a machine element that constrains relative motion between moving parts to only the desired motion. The design of the bearing may,...