rolling mill nsk bearings internal clearance is defined as one NSK bearing collar related to another NSK bearing collar in the radial (radial clearance) or axial (axial clearance) can move the total interval. About NSK bearing clearance, must distinguish the NSK bearing internal clearance before the device and the NSK bearing internal clearance (task clearance) after the device reached the task temperature. The initial internal clearance (before the device) is greater than the task clearance, due to the difference in the level of interference common and NSK bearing ring and related parts of the thermal expansion of the difference will make NSK bearing ring expansion or shortening.
In order to make rolling mill nsk bearings superior operation, radial clearance is very important. General principle, the ball bearing should always have simply equal to zero task clearance, perhaps slightly pre-loadable. On the other hand, cylindrical, spherical and CARB circular roller bearings in operation should always have some residual clearance – no matter how small. The same applies to tapered roller bearings, except in NSK bearing equipment that requires rigidity, such as pinion NSK bearing equipment, each of which should have a certain amount of preload in the installation.
Whenrolling mill nsk bearings equipment using the recommended public relations common, and in the ordinary normal task premise, choose the common group clearance NSK bearing, you can get the appropriate task clearance. If the operation and installation conditions and normal conditions diverge, for example, two NSK bearing circle are using interference common, often have abnormal temperature, etc., need more or less than the standard internal clearance. In these conditions, should be installed after the NSK bearing clearance of the residual.
rolling mill nsk bearings other than the common group clearance, the general today suffix C1 to C5 to reveal. Internal clearance of the additional code suffix internal clearance
C1 smaller than C2
C2 smaller than the common group
CN common group clearance, where only with other letters, reveal clearance limit reduction or offset
C3 larger than the norm
C4 greater than C3
C5 greater than C4