Combined Needle Roller Bearings
Needle roller bearings have a very high load carrying capacity in relation to their overall volume, and are therefore well suited to bearings that must have a small radial cross-section. They are used in the manufacture of transmissions, engines and agricultural machinery. Combined needle roller bearings are made up of two components, one of which is a cylindrical roller bearing and the other a needle roller bearing. The needle roller bearing component has a smaller radial section height than other bearings of similar dimensions, which makes it suitable for applications where space is limited. Combined needle roller bearings are ideal for operating conditions that require low speed, high load carrying capacity and reduced noise levels.
Needle roller bearings consist of several rows of rollers in a cage, situated between two walls made of steel or plastic. Combined needle roller bearings have cylindrical roller bearings as their outer raceway, which makes them capable of bearing radial loads as well as thrust loads in one direction. The cylindrical roller bearing is ground so that there is a uniform distance between its raceways and the needle rollers. This ensures that the needle rollers do not roll on the walls of the bearing cage. Cylindrical rollers are used in these bearings because they offer greater radial load carrying capacity compared to other types of bearings.
In combined type needle roller bearings, their inner face diameter is larger than their outside diameter, making them suitable for operating at extreme loads and speeds. Their slender profile allows them to fit in confined spaces and their ability to support high axial loads makes them an ideal choice for applications requiring high performance.
In many applications, such as in transmissions and engines, combined needle roller bearings are used in combination with ball bearings to provide maximum performance. When used in tandem, the ball bearings take care of the axial loads, while the combined needle roller bearings handle the radial loads. This type of bearing is suitable for use in environments where high speed operation is not required, as they are generally recommended for heavy-duty applications.
Combined needle roller bearings are most commonly used in hubs, driveshafts and gearboxes, as well as in transmissions and engines. They are also widely used in agricultural and industrial machinery, such as pumps and compressors. Their robust design and high load-carrying capacity make them an ideal choice for a variety of applications.
