ROCK BIT NOZZLE DIFFUSER

A rotary cone rock bit for use in earthen formations with drilling flui d hydraulics wherein diffusion type nozzles are utilized in the outer diameter s of a dome portion of the rock bit resulting in fluid, as it leaves the exit end o f the nozzle, continues to diffuse outboard creating a larger surface area to entrain fluid. The diffused spray of fluid at a lesser velocity will better clean the rotar y cones by moving the fluid closer to the cones without erosive damage to the cones or loss of cutter inserts or milled teeth. The diffused spray will additionally cover a larger area of a borehole bottom resulting in better bottom hole cleaning.