Calculation of linear bearings

Calculation of bearing service life

Length life L=5 * [(FH * FT * Fc/Fw) * (C/Pc)] 3 ³ (Unit: 10km 10000 meters)

Basic rated dynamic load C (unit: Kg/kg)

When the working stroke is 1.5 times shorter than the bearing length, the shaft life is shorter than the bearing life.

When the stroke is 0.2-1.5 times the bearing length, the rated dynamic load is calculated based on the original 0.4-1.0 times. 

The rated load of open end bearings when subjected to lateral force 

and opening direction force is calculated based on one-third of the original

The working load Pc (calculated in Kg)

Hardness coefficient FH: 

hardness HRC25 or above, FH=1.0; Hardness HRC52-58, FH=0.6-1.0.

Temperature coefficient FT: 

When the working temperature is less than 100 ℃, FT=1.0; 

Working temperature 100 ℃~125 ℃, Fr=1.0~0.95

Contact coefficient Fc

Install one set of bearings per shaft, Fc=1.0

Install two sets of bearings per shaft, Fc=0.81

Install three sets of bearings per shaft, Fo=0.72

Install four sets of bearings per shaft, Fc=0.66

Load factor FW

Operating speed less than 15 meters/minute, no impact, no vibration, Fw=1.0~1.5

Operating speed less than 60 meters per minute, minor impact or vibration, Fn=1.5-2.0

Operating speed less than 60 meters per minute, or with significant impact or vibration, Fw=2.0-5.0

Time lifespan LH=(10000 * L)/(2 * LS * n1 * 60) (unit: h hours)

L: Length lifespan (10000 meters),

LS: Working stroke (meters)

N1: Number of cycles per minute.