Study on Optimum Structural Design of Roller Bit Bearing Double Rubber Ring Seal

Roller bit is one of the most important rock-breaking tool in drilling engineering, Its performance will directly affect the quality of drilling, drilling efficiency and drilling cost, Bit life depends on the bearing life, And the bearing life is largely dependent on the bearing seal life. In this paper, By using the nonlinear finite element software ABAQUS to establish the 2D axisymmetric model of cone bit double rubber ring seal, Simulate the assembly process and external pressure of roller bit, Analysis and calculation for different inner pore structure of rubber ring strain, compression ratio and contact pressure distribution, Analysis and calculated for different shaft diameter groove structure on the sealing surface of the strain, the compression rate and the impact of the contact pressure, Analysis and calculated for different cross-sectional shape of the rubber ring strain, compression ratio and the contact pressure distribution, The results showed Straight cone bore conducive to two rubber ring equal life. The rectangular groove structure is beneficial to reduce the strain, compression rate and maximum contact pressure of rubber ring. When the double-notch fillet radius 0.5, the rubber ring has a minimal strain, compression rate, contact pressure. O-section rubber ring is better than other cross section rubber ring.