Adopt the NTN bearings
which noise is relative small
1) the ball bearing noise is lower than roller bearing。 Relative sliding less Japanese NTN spherical roller bearing
( friction ) noise is lower than bearings sliding more.
2) Imported NTN bearing spherical roller bearing which use solid cage produce lower noise than the bearings that use punch retainer; the bearings that use plastic cage produce lower noise than the above two kinds bearings use different cages; the more ball , the thicker the outer ring, the lower noise,
3) high precision bearings, particularly the spherical roller bearings use rolling body of higher accuracy, it noise is low than the low precision NTN bearings
4) small bearing noise is small than big bearing noise.