Abstract: To prevent the “edge effects” of the cutter bearing’s contact pressure distribution， it is particularly important to determine the appropriate modification parameters. Based on dynamic load obtained through simulation， cutter bearing’s load spectrum was generated by establishing the dynamics model of the disc cutter’s bending-axial-swing coupling system. And based on the maximum roller load， the model of cutter bearing was made by the Ansys in order to obtain the best parameters. The results show that compared with center cutter and face cutter， maximum load of edge cutter increases by 87% and 20%， respectively. The roller which is crowned of 0.029mm with contact ratio of 0.6 eliminates the stress concentration at roller-raceway contact edge， improves the contact stress distribution， with the average contact stress decreased by 17.26% and increases the contact fatigue life.

Key words: cutter bearing, dynamic load of the disc cutter, cutter bearing’s load spectrum, crown