Application of deep end-cavity cylindrical roller bearings to cone bits

In China,the roller bearing cone bit is now equipped with short cylindrical roller,which has stress centralization on the edge,and it easily causes fatigue failure on the contact area.In order to prolong the service life of roller bearing,a deep end-cavity roller is applied to roller bearing of cone bits.Using Finite Element Analysis(FEA) methods,the contact stresses of common column roller and deep end-cavity roller are analyzed under the radical stress,and the structure parameters of latter are optimized.The deep end-cavity roller reduces its maximum contact stress by 22.33 percent than the common column roller,and the depth of its deep end and the diameter of its notch are optimized to 4.4 mm and 5 mm respectively.Results show that the deep end-cavity roller can overcome stress centralization which appears easily to common column roller,and reduce the maximum contact stress apparently and increase the anti-fatigue failure,at the same time prolong the service time of the bearing.