They are used often in the automotive industry and heavy equipment industry

　　A roller bearing is any cylindrical or spherical object that aids in the movement of an object greater in size than the bearing itself. A roller bearing is a weight distribution-oriented bearing. The bearing utilizes many points of contact between a circular housing that contains internal rolling elements, such as ball bearings that sit within a collar. These bearing systems use the decrease in rolling resistance as a means of increasing the efficiency of moving an object. Roller bearings come in a wide variety of sizes and shapes but generally fall into one of three categories: Cylindrical, Tapered and Needle. Cylindrical Roller Bearing Cylindrical roller bearings are perhaps one of the most familiar and common forms of roller bearing. The basic design is a pair of rings with bearings between. These bearings may be spherical in shape but typically are cylindrical.

Cylinders allow for the width of the bearing to be larger than what would be possible with a ball bearing alone. These types of roller bearings can handle a large radial load and moderate amount of thrust since the load is distributed across cylinders instead of spheres. They are commonly used for applications where an object needs to slide along in a plane. Advantages : 1. High capacity under radial loads 2. Accurate guiding of the rollers 3. Limited free axial movement(single flange design only) Applications : a. Transmissions b. Differentials c. Rear Axle Shafts Tapered Roller Bearing Tapered roller bearing are similar in construction to cylindrical roller bearings except that instead of the cylinders being perpendicular to the ring, they are angled and offset. This construction has the added benefit of additional load support and the ability to spin the bearing more quickly.

They are used often in the automotive industry and heavy equipment industry. Advantages : 1. The first benefit of the tapered roller bearing is its cone shaped design. Each roller in the bearing can align itself perfectly between the tapered faces of the cup and cone, without guidance by the cage. That is a major development in bearing design and operation. The large end of each roller has been ground so that it is square against the rib along the back of the inner race . Without the "rib," rollers would be forced from the cage. As each roller revolves about the cone, a wide area of contact is made between the large end of the roller and the rib. This wide area of contact compels each roller to maintain accurate alignment.