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| Taper Roller Bearing |
| Sunday, January 25, 2009 |
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 capacity of the bearings is largely determined by the contact angle α (fig 8);
the larger α, the higher the axial load carrying capacity (fig 9)
An indication of the angle size is given by the calculation factor e; the larger the value of e, the larger the contact angle and the greater the suitability of the bearing for carrying axial loads.
Taper roller bearings are generally separable, i.e. the cone, consisting of the inner ring with roller and cage assembly, can be mounted separately from the cup (outer ring).
SKF taper roller bearings have the logarithmic contact profile that provides for optimum stress distribution over the roller/raceway contacts. The special design of the sliding surfaces of the guide flange and large roller ends considerably promotes lubricant film formation in the roller end/flange contacts. The resulting benefits include increased operational reliability and reduced sensitivity to misalignment. |
posted by Engineer @ 11:47 AM   |
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