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In the tapered roller bearings before mounting, tapered roller bearing internal clearance is called the initial clearance, clearance of KOYO bearings after installation called residual clearance. Because of the bearing inner ring after installation in general because of interference fit and expansion, so residual clearance is less than the initial clearance. Tapered roller bearing clearance at no load operation is called effective clearance, due to the influence of bearing and the rise of temperature in the cooling conditions during operation, in general, the outer ring inner temperature is higher, the temperature difference between 5-10 degrees, so the large expansion quantity in the outer ring of the expansion ring, bearing clearance is less than the residual clearance.
Because the clearance is that a ring KOYO bearings relative to another ring, along the radial or axial from a limit position toward the movement of another limit position, so the clearance is divided into radial clearance and axial clearance of two. Clearance is an important technical parameters of the bearing, it directly affects the load distribution, bearing vibration, noise, friction, motion precision and other technical service life and mechanical properties. Strictly speaking, the rated load of rolling bearing is changed with the clearance size, rated load bearing in the sample is in effective clearance of bearing is zero recommended values. The clearance is too large, will cause the bearing dynamic accuracy, vibration and noise increases, shortening the service life of the bearing; if the clearance is too small, will cause the temperature rise, even lead to bearing in operation of seizure. Therefore, according to the selection of bearing clearance different types and working conditions of the bearing is very important.
Calculation method of tapered roller bearings rolling load bearing capacity, there are special provisions in the KOYO bearing technology, according to the following steps:
1, determine the magnitude and direction of the applied load in the rolling bearing tapered roller
2, according to the size and direction of the external load, the formula according to the provisions of various types of bearings, add it into equivalent dynamic load.
3, the calculation formula of equivalent dynamic load and life working speed into the bearing, to calculate the service life of bearing KOYO.
From the theory of clearance less tapered roller bearings are mounted on a shaft or housing because of interference fit has a ring expansion or contraction of the clearance after called " installation clearance "
In the installation on the tapered roller bearing clearance and trapped inside the difference size variation after clearance called " effective clearance "
Tapered roller bearing installation, bearing some load when rotating clearance in the machine, to produce KOYO bearing load that is the effective clearance and elastic deformation after the clearance is called a " clearance " when working gap is negative, the fatigue life of the tapered roller bearing of the longest, but with the increase of negative clearance is significantly reduced fatigue life. Therefore, selection of tapered roller bearings when the tour, and generally make work clearance to zero or slightly positive is appropriate.
| Product Model | Inside Diameter | Outside Diameter | Thickness |
| 7020CDF NSK | 100 | 150 | 24 |
| 7020ADF NSK | 95 | 150 | 24 |