The role of double-row deep groove ball bearings with NSK Bearings still rings and rotations were still part of the installation position (usually bearing) and the rotating part (usually the shaft) consolidation together in order to achieve the rotation stateunder passing loads and limit movement relative to the stationary system the location of the basic tasks.

Shaft and bearing, NSK bearing requirements in three directions, radial, axial and tangential direction is fixed in its position. Radial and tangential orientation by the tight fit of the double row deep groove ball bearing rings adopt to achieve the axial position only in rare cases, a tight fit; and the general axial spacing parts, such as end cap and retaining ring the axial position is limited within the range of clearance.

Double row deep groove ball bearings shaft diameter and bearing direct contact with the prevent the occurrence of adhesion and the formation of the boundary lubrication performance. Compatibility of materials of the impact of Friction factors are:
 (1) as vice Materials and Metallurgy, constitute the degree of difficulty of the alloy.
 (2) the affinity and capacity of the materials and lubricants.
 (3) into a pair materials state without lubrication, the friction factor.
 (4) The microstructure of the material.
 (5) the thermal conductivity.



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