The drawn cup needle bearings help in reducing the friction between the two rotating objects of a mechanical component. These needle rollers are created and designed to provide support for various radial loads as well.
Most of the rolling element are made up of either ball bearings or roller bearings. Needle rollers are not only the smallest type of bearing but also the lightest in the family. These attributes are useful and is what gives these roller bearings certain advantages, especially to those components that requires lighter weight and smaller space.
Drawn-Cup bearings have two designs in total, and they are the full complement and the caged version. Both of them have outer shells. These shells serve as a raceway for the rollers that are contained inside these bearings.
However, the full complement roller bearings include a maximum number of rollers that are mechanically contained by the outer designed shell. This therefore provides for the combining of a maximum number of highly radical as well as load carrying ability with a significantly lower cost.
On the other hand, the caged or the standard version of roller bearing has a single piece steel cage. This cage is used to help guide the rollers and retain them when necessary. This particular design is built for high speed and a great lubrication capability.
Drawn-cup needle roller bearings are easier to handle and install. They do better as loose rollers but in an assembly that is unitized. The outer shell is drawn with precision with the help of a low carbon strip steel and the entire case is hardened.
The lips of the cup are turned in, and therefore it provides mechanical retention of trunnion-end needle rollers. These lips also behave as several tight fitted shields to retain lubrication and repel foreign elements.
Some of the elements that needle roller bearings are:
· They have a higher than usual load capacity when compared to single row ball bearings or roller bearings of the same shape and size as them.
· They have the ability to easily handle a large and a rigid shaft when presented in certain applications.
· They have excellent rolling capabilities; given that they are usually present in a small cross section.
· Also, they have lower cost, especially for being drawn-cup style, when compared to its machine version.
· Can be used in planetary gears, u-joints, and even in constant mesh gears.
The lines of contact in a drawn-cup full complement that are formed by these loaded rollers also suits these bearings better for static, slow rotating, or even oscillating conditions. On the other hand, drawn-cup caged bearings are best suited for usage in housing elements of low hardness. They are, after all, built for higher speed.
Application that uses this type of bearings are shaft supports of general gearboxes, pulley systems and supports, gear pumps, and pilot bearings.
Researches are being conducted across the mechanical world constantly for proving better needle rollers across the mechanical industry to search for durable and light weight rollers. With specialized manipulation of geometric optimization, a wide range of customization are now readily available as well.