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NACHI Cylindrical Roller Bearings
  • NACHI Cylindrical Roller Bearings

NACHI Cylindrical Roller Bearings

This roller bearing structure is the simplest of all roller bearings. Inside and outside the ring and the roller for the line contact, so the radial load capacity, but also for high-speed rotation occasions.
INQUIRY
The construction of this bearing is the simplest of all roller bearings. The inner and outer raceways come in line contact with the rollers, so the high radial load capacity is also suitable for high-speed rotation applications.
N, NU type can not bear the axial load, but can be used as a free end to eliminate the influence of thermal expansion, but also can absorb the axial position error between the spindle and the bearing seat.

The inner and outer wheels have bearings bearing the bearing surface and can bear a certain axial load. However, due to the axial force being absorbed, the roller end surface and the backward bearing surface are purely sliding and therefore can not withstand too much Large axial load.

Double row cylindrical roller bearings are generally precision class bearings, radial load capacity, suitable for high speed, high precision applications, such as lathe spindle. Double row cylindrical roller bearings NN and NNU series, please refer to the precision bearing section.
 Retainer
Standard cylindrical roller bearings are commonly used stamping retainer and car holder. High-speed operation is recommended to use car holder. When the same parent with a different cage, the number of rollers may also change, this time the basic dynamic and static rated load will follow change. Catalog recorded the basic dynamic and static rated load, the use of the following table holder.

Form and structure
After the type may have high load and retainer of the mark.
G: Polyamide retainer. (Nylon retainer)
Standard holders used in some specifications are made of nylon. When the bearing is nylon retainer, the recommended operating temperature is below 120 ° C.
(For example: NU304EG)
E: High load bearing
NACHi research and improvement of the shape of the roller edge, developed with the original design twice the life of high-load bearing.
(Example: NU2305E)
 
Internal clearance
The range of clearance is in accordance with Japanese Industrial Standards (JIS).
Bearing series Stamping retainer Copper alloy car holder
NU10 1007 ~ 1038 1040 ~ 10/500
NU2 203 ~ 228 230 ~ 264
NU22 2204 ~ 2226 2228 ~ 2252
NU3 304 ~ 324 326 ~ 352
NU23 2304 ~ 2319 2320 ~ 2340
NU4 405 ~ 416 417 ~ 430
Bearing life
Frequently asked question is: "How much power can this bearing withstand?"
Strictly speaking, the maximum force that a bearing can withstand without damage is equal to the "basic static load rating" in the specification table. But does not mean that can run for a long time!
Should be asked is, in the use of load and speed, the bearing can achieve the required life?
Bearing life can be calculated, but before calculating life expectancy, you need to know the speed and equivalent load. The so-called equivalent load is calculated when the bearing bear both radial load (Fr) and axial load (Fa), which is equivalent to pure radial load calculation load, usually expressed in Pr and Por. Please refer to the table at the top right of catalog for the calculation method of Pr and Por.

Recommended tolerances
In order to play the performance of the bearing itself, the tolerance of the mandrel and the bearing seat hole is very important. Slipping may occur if there is insufficient interference with the mating surface.
Once skidding occurs, the mating surface will gradually wear and damage the mandrel and housing. In addition, abrasion powder may also penetrate inside the bearing leading to the occurrence of early damage.
Slipping can not be prevented by axial grasping only, and the wheel bearing the load must provide enough interference.

Extreme speed
The speed limit described in the catalog is the value of the car holder. If it is a press holder, take 80% of the value as the limit speed. In addition, in the heavy load, the limit speed must be multiplied by a correction factor.
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