Rolling includes a raceway (inner ring and outer ring), rolling elements (balls or rollers) and cage, the cage through the rolling body to maintain a certain distance, and fixed in the correct position, rolling motion.

Raceway (inner ring and outer ring) or raceway

Rolling body contact surface is called "raceway", this contact surface to withstand all load bearing.

Usually the inner ring fixed to the shaft, while the outer ring of the bearing housing is fixed.

Rolling elements

According to the rolling body shape into balls and rollers, while the rollers are divided into four categories: cylindrical roller, needle roller, tapered roller and spherical roller drum.

Geometrically speaking rolling body and the inner and outer ring raceway is a contact point (ball) or line (roller) is.

In theory, the rolling elements, including the outer ring raceway rolling motion, and transfer points.

Cage

Rolling ring raceway is its contact surfaces of the load borne by the supporting bearing retainer does not directly bear the load. It's just to maintain the correct position and spacing of the rolling elements, while preventing the installation of rolling bearings off. Type cage classified according to production methods, including push-car standard and the form of the cage.

Bearing design

When a public area to install two shaft bearings, the design of a permit due to the temperature rise caused by the linear expansion of the shaft and the mounting structure of the gap error caused during the assembly is necessary, for this purpose, to which the installation set of bearings for supporting radial and axial loads. Fixed inner and outer ring on the shaft and housing, as a result there is no collar axially movable. Install another set of bearings so that it can move axially as radial load bearing capacity as the "Active" side bearings. If you choose to form bearing structure swimming-end bearing suited due to thermal expansion caused by the linear axis movement, we must choose a permit axial movement of the outer ring bearing fitted in the bearing seat.

If one has N, NU or RNU structure type cylindrical roller bearings are used as swimming end bearings, then since the temperature rise caused by the expansion of the shaft can move through the axial bearing inner ring to release. Since the load relationship, if internal and outer interference fit both requirements, if the cylindrical roller bearings for swimming end bearings, bearing so easy to install.

If the NF or NJ type cylindrical roller bearings for a shaft ends must be prevented from becoming too small axial clearance.

Since the temperature is generally low or short axis, the smaller the amount of expansion if the shaft and does not require precise axial positioning, you can use two have swimming axial displacement inseparable-bearing units. In this case the two units, with axial clearance will be mounted at both ends of the component.

Paired single row angular contact ball bearings or tapered roller is often used as axial positioning, when a large bearing space occupied by the axial temperature rise caused by the expansion of the best pairs where the bearing in the axial and radial load.

When using horizontal split bearing as the fixed bearing, the outer ring by one or two locating rings positioning. When using a ring, placing tight nut side. When using two locating rings, one in South Africa to put on each side bearings. Use the horizontal split bearing as a free end bearings, install Bearing no retaining ring.

Based on considerations of balance and mechanical applications Bearing rated life of the individual to determine the fixed bearing position. For motors, often bearing a fixed end at the non-drive end, the lower the amount of radial load applied thereto so as to balance the equivalent load bearing and bearing rating life between the two.