V Groove Idler Wheels Roller Bearing Used in Linear Guide

Basic Dynamic Load Rating(C)

This term is arrived at based on an evaluation of a number of identical linear systems individually run in the same conditions, if 90% of them can run with the load (with a constant value in a constant direction) for a distance of 50 km without damage caused by rolling fatigue. This is the basis of the rating.

Allowable Static Moment (M)
This term defines the allowable limit value of static moment load, with reference to the amount of permanent deformation similar to that used for evaluation of basic rated load (Co).

Static Safety Factor (fs)
This factor is used based on the application condition as shown in Table 1.

Basic Static Load Rating (Co)
This term defines a static load such that, at the contacting position where the maximum stress is exercised, the a sum of the permanent deformation of the rolling elements and that of the rolling plane is 0.0001 time of diameter of the rolling elements.



Clearance and Fit
When a standard-type linear bushing is used with a shaft, inadequate clearance, adjustment may cause early bush failure and/or poor, rough travelling. The clearance adjusted when assembled in the housing which can control the outside cylinder diameter. However, too much clearance adjustment increases the deformation of the outside cylinder, to affect its precision and life. Therefore, the appropriate clearance between the bush and shaft, and clearance between the and housing are required according to the application. Table 2 shows recommended fit of the bush: