Memo:
It is the basic version of spiral roller bearing, with low limit speed. It can only
bear the radial shock load, while disables to limit the axial displacement of both
bearing and its shell or bear the axial load. Therefore, it is only applied in the components
whose rotating accuracy is not high and which frequently suffer greater shock load. In
installation of the bearing, it is allowed to leave 0.5° axial gradient of inner/outer ring