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The four-row cylindrical roller bearing mainly bears radial combined load in diameter and axis. Bearing capacity depends on the raceway Angle of the outer ring, the greater the Angle, the greater the bearing capacity. This kind of bearing belongs to separate type bearing, which can be divided into single row, double row and four row tapered roller bearings according to the number of rolling body in the bearing... Its characteristics are small friction resistance, high speed, can be used to bear radial load or radial and axial simultaneous action of the combined load on the parts, but also can be used to bear axial load on the parts, such as small power motors, cars and tractors gearboxes, machine tool gear box, general machines, tools, and so on... Slewing bearing is also called rotary bearing, some people also called it: rotary support, cyclotron support.It is a kind of large bearing that can bear comprehensive load and can bear large axial, radial load and overturning moment at the..