Tapered roller bearings have tapered inner and outer ring raceways, tapered roller arranged between the two. All conical surface projection lines in the bearing axis with a little together. This design makes tapered roller bearings particularly suitable for bear compound (radial and axial) loads. Most of axial load bearing capacity is determined by the contact angle α; α angle the greater the axial load capacity is higher. Angle size to calculate the coefficient of e said; e larger the value, the greater the contact angle, the bearing axial load greater applicability.