The lubricating oil of the main shaft bearing using rolling bearings is generally considered comprehensively according to the product of the bearing inner diameter d and the main shaft speed n, that is, the speed factor dn, the bearing operating temperature T, the load P borne by the bearing and other parameters.

The following is the selection of recommended lubricating oil grades for rolling bearings. The types of lubricating oil can be selected from FC or FD bearing oil, HL hydraulic oil, TSA turbine oil, DAD compressor oil, gasoline engine oil or cylinder oil, etc., depending on the product type, working conditions and viscosity grade

1. The bearing operating temperature is -30-0℃, the normal load (3MPa) is suitable for oil viscosity (40℃) 18-32mm2/s, viscosity grade 22, 32; the heavy load or impact load (3MPa-20MPa) is suitable for oil viscosity (40℃) 18-50mm2/s, viscosity grade 32, 46.

2. Bearing operating temperature 0-60℃, speed factor (dn value) below 15000mm.r/min, applicable oil viscosity (40℃) 32-70mm2/s for normal load, viscosity grade 32, 46, 68, applicable oil viscosity (40℃) 70-192mm2/s for heavy load or impact load (3MPa-20MPa), viscosity grade 68, 100, 150; speed factor (dn value) 15000-75000mm.r/min, applicable oil viscosity (40℃) 32-50mm2/s for normal load, viscosity grade 32, 46, applicable oil viscosity (40℃) 42-90mm2/s for heavy load or impact load (3MPa-20MPa), viscosity Grades 46, 68, 100; speed factor (dn value) 75000-150000mm.r/min, applicable oil viscosity (40℃) 15-32mm2/s for normal load, viscosity grades 15 and 32, applicable oil viscosity (40℃) 32-42mm2/s for heavy load or impact load (3MPa-20MPa), viscosity grade 32; speed factor (dn value) 150000-300000mm.r/min, applicable oil viscosity (40℃) 9-12mm2/s for normal load, viscosity grades 5, 7, 10, applicable oil viscosity (40℃) 18-32mm2/s for heavy load or impact load (3MPa-20MPa), viscosity grade 15.

3. Bearing operating temperature 60-100℃, speed factor (dn value) below 15000mm.r/min, suitable oil viscosity for normal load 40℃ 110-192mm2/s (100℃ 9.3-12.5mm2/s), viscosity grade 150, suitable oil viscosity (40℃) 195-240mm2/s (100℃ 15-24mm2/s), viscosity grade 150; speed factor (dn value) 15000-75000mm.r/min, suitable oil viscosity for normal load 40℃ 70-120mm2/s (1 00℃5.6-9.3mm2/s), viscosity grade 68, 100, heavy load or impact load (3MPa-20MPa) applicable oil viscosity (40℃) 110-192mm2/s, viscosity grade 150; speed factor (dn value) 75000-150000mm.r/min, ordinary load applicable oil viscosity 40℃50-90mm2/s (100℃5.6-9.3mm2/s), viscosity grade 46, 68, 100, heavy load or impact load (3MPa-20MPa) applicable oil viscosity (40℃) 70-120mm2/s, viscosity grade 100