mechanical engineering

The angular contact thrust ball bearings shown here were originally designed to support the rotary tables of drilling rigs but are also suitable for other applications where high load carrying capacity, high axial stiffness and low friction torque are important. In contrast to conventional thrust ball bearings, angular contact thrust ball bearings can accommodate radial loads in addition to axial loads and are able to operate at high speeds. Single direction angular contact thrust ball bearings Single direction angular contact ball bearings ( fig 1 ) are able to take up axial loads acting in one direction. They are of separable design, i.e. the washers and ball and cage assembly can be mounted individually. In the main application area for these bearings – rotary tables – two bearings are always adjusted against each other. The second bearing has to carry the weight of the drill when it is stationary and has a higher load load carrying capacity than the first bearing. fig 1 Double d...

Needle roller bearings are roller bearings with cylindrical rollers which are thin and long in relation to their diameter. ISO uses the definition that the roller length is 2,5 times the roller diameter or more. They are referred to as needle rollers. In spite of their low cross section the bearings have a high load carrying capacity and are thus extremely suitable for bearing arrangements where radial space is limited. The SKF range of needle roller bearings is extensive and, in addition to customized designs, it comprises the following types: – Needle roller and cage assemblies – Drawn cup needle roller bearings with open ends and with closed end – Needle roller bearings with and without flanges with and without inner ring – Sealed needle roller bearings with and without inner ring – Alignment needle roller bearings with and without inner ring – Combined needle roller bearings *Needle roller/ball bearings *Needle roller/thrust ball bearings *Needle roller/cylindrical roller thr...

Taper roller bearings are produced in many designs and sizes to match their many uses. These can be grouped as follows: –single row taper roller bearings ( fig 1 ) –paired single row taper roller bearings ( fig 2 ) –double row taper roller bearings ( fig 3 ), and –four-row taper roller bearings ( fig 4 ). These are described in four separate sections under the appropriate headings. There are also sealed, greased and preadjusted units based on taper roller bearings, such as – hub bearing units for passenger cars ( fig 5 ) – hub bearing units for trucks ( fig 6 ), and – tapered bearing units ( fig 7 ) for railbound vehicles. Design featuresTaper roller bearings have tapered inner and outer ring raceways between which tapered rollers are arranged. The projection lines of all the tapered surfaces meet at a common point on the bearing axis. Their design makes taper roller bearings particularly suitable for the accommodation of combined (radial and axial) loads. The axial load carrying capac...