In order not to make nickel ring up tank, outside groovediameter ratio inside groove is big, this on the structure solved the nickel ring grooving problem.
为了不使镍环起槽，外沟直径比内沟大，这在结构上解决了镍环起槽问题。
2
By the way of improving roller dimensions, roller number, outer roller path diameter, stop groovediameter and the effective thickness, the using reliability of the bearing is advanced.